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  • 251.
    Aminifar, Amir
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Analysis, Design, and Optimization of Embedded Control Systems2016Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    Today, many embedded or cyber-physical systems, e.g., in the automotive domain, comprise several control applications, sharing the same platform. It is well known that such resource sharing leads to complex temporal behaviors that degrades the quality of control, and more importantly, may even jeopardize stability in the worst case, if not properly taken into account.

    In this thesis, we consider embedded control or cyber-physical systems, where several control applications share the same processing unit. The focus is on the control-scheduling co-design problem, where the controller and scheduling parameters are jointly optimized. The fundamental difference between control applications and traditional embedded applications motivates the need for novel methodologies for the design and optimization of embedded control systems. This thesis is one more step towards correct design and optimization of embedded control systems.

    Offline and online methodologies for embedded control systems are covered in this thesis. The importance of considering both the expected control performance and stability is discussed and a control-scheduling co-design methodology is proposed to optimize control performance while guaranteeing stability. Orthogonal to this, bandwidth-efficient stabilizing control servers are proposed, which support compositionality, isolation, and resource-efficiency in design and co-design. Finally, we extend the scope of the proposed approach to non-periodic control schemes and address the challenges in sharing the platform with self-triggered controllers. In addition to offline methodologies, a novel online scheduling policy to stabilize control applications is proposed.

  • 252.
    Aminifar, Amir
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Self-Triggered Controllers, Resource Sharing, and Hard Guarantees2016Inngår i: 2016 2ND INTERNATIONAL CONFERENCE ON EVENT-BASED CONTROL, COMMUNICATION, AND SIGNAL PROCESSING (EBCCSP), IEEE , 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Today, many control applications in embedded and cyber-physical systems are implemented on shared platforms, alongside other hard real-time or safety-critical applications. Having the resource shared among several applications, to provide hard guarantees, it is required to identify the amount of resource needed for each application. This is rather straightforward when the platform is shared among periodic control and periodic real-time applications. In the case of event-triggered and self-triggered controllers, however, the execution patterns and, in turn, the resource usage are not clear. Therefore, a major implementation challenge, when the platform is shared with self-triggered controllers, is to provide hard and efficient stability and schedulability guarantees for other applications. In this paper, we identify certain execution patterns for self-triggered controllers, using which we are able to provide hard and efficient stability guarantees for periodic control applications.

  • 253.
    Aminifar, Amir
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Bini, Enrico
    Scuola Super Sant Anna, Italy.
    Eles, Petru lon
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Analysis and Design of Real-Time Servers for Control Applications2016Inngår i: I.E.E.E. transactions on computers (Print), ISSN 0018-9340, E-ISSN 1557-9956, Vol. 65, nr 3, s. 834-846Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Today, a considerable portion of embedded systems, e.g., automotive and avionic, comprise several control applications. Guaranteeing the stability of these control applications in embedded systems, or cyber-physical systems, is perhaps the most fundamental requirement while implementing such applications. This is different from the classical hard real-time systems where often the acceptance criterion is meeting the deadline. In other words, in the case of control applications, guaranteeing stability is considered to be a main design goal, which is linked to the amount of delay and jitter a control application can tolerate before instability. This advocates the need for new design and analysis techniques for embedded real-time systems running control applications. In this paper, the analysis and design of such systems considering a server-based resource reservation mechanism are addressed. The benefits of employing servers are manifold: providing a compositional and scalable framework, protection against other tasks misbehaviors, and systematic bandwidth assignment and co-design. We propose a methodology for designing bandwidth-optimal servers to stabilize control tasks. The pessimism involved in the proposed methodology is both discussed theoretically and evaluated experimentally.

  • 254.
    Aminifar, Amir
    et al.
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, ESLAB - Laboratoriet för inbyggda system. Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska högskolan.
    Jfair: A Scheduling Algorithm to Stabilize Control Applications2015Inngår i: 21st IEEE Real-Time and Embedded Technology and Applications Symposium, Cyber-Physical Systems Week, Seattle, WA, April 2015, IEEE Computer Society, 2015, s. 63-72Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Control applications are considered to be among the core applications in cyber-physical and embedded realtime systems, for which jitter is typically an important factor. This paper investigates whether it is possible to guarantee certain amount of jitter for a given set of applications on a shared platform. The effect of jitter on the stability of control applications and its relation with the latency will be discussed. The importance arises from the fact that it is considerably easier to manage the constant part of the delay (known as latency), while the process of coping with the varying part of the delay (known as jitter) is more involved. The proposed solution guarantees certain jitter limits, and at the same time does not lead to overly pessimistic latency values. The results are later used in a design optimization problem to minimize the resource utilized.

  • 255.
    Aminifar, Amir
    et al.
    Embedded Systems Laboratory, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Optimization of Message Encryption for Real-Time Applications in Embedded Systems2018Inngår i: IEEE Transactions on Computers, ISSN 0018-9340, Vol. 67, nr 5, s. 748-754Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Today, security can no longer be treated as a secondary issue in embedded and cyber-physical systems. Therefore, one of the main challenges in these domains is the design of secure embedded systems under stringent resource constraints and real-time requirements. However, there exists an inherent trade-off between the security protection provided and the amount of resources allocated for this purpose. That is, the more the amount of resources used for security, the higher the security, but the fewer the number of applications which can be run on the platform and meet their timing requirements. This trade-off is of high importance since embedded systems are often highly resource constrained. In this paper, we propose an efficient solution to maximize confidentiality, while also guaranteeing the timing requirements of real-time applications on shared platforms.

  • 256.
    Aminifar, Amir
    et al.
    Embedded Systems Laboratory, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland..
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Cervin, Anton
    Department of Automatic Control, Lund University, Sweden.
    Årzén, Karl-Erik
    Department of Automatic Control, Lund University, Sweden.
    Control-Quality Driven Design of Embedded Control Systems with Stability Guarantees2017Inngår i: IEEE design & test, ISSN 2168-2356, E-ISSN 2168-2364Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Today, the majority of control applications in embedded systems, e.g., in the automotive domain, are implemented as software tasks on shared platforms. Ignoring implementation impacts during the design of embedded control systems results in complex timing behaviors that may lead to poor performance and, in the worst case, instability of control applications. This article presents a methodology for implementation-aware design of high-quality and stable embedded control systems on shared platforms with complex timing behaviors.

  • 257.
    Aminifar, Amir
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Tabuada, Paulo
    University of California at Los Angeles, USA.
    Eles, Petru
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Peng, Zebo
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Self-Triggered Controllers and Hard Real-Time Guarantees2016Inngår i: PROCEEDINGS OF THE 2016 DESIGN, AUTOMATION & TEST IN EUROPE CONFERENCE & EXHIBITION (DATE), Institute of Electrical and Electronics Engineers (IEEE), 2016, s. 636-641Konferansepaper (Fagfellevurdert)
    Abstract [en]

    It is well known that event-triggered and self-triggered controllers implemented on dedicated platforms can provide the same performance as the traditional periodic controllers, while consuming considerably less bandwidth. However, since the majority of controllers are implemented by software tasks on shared platforms, on one hand, it might no longer be possible to grant access to the event-triggered controller upon request. On the other hand, due to the seemingly irregular requests from self-triggered controllers, other applications, while in reality schedulable, may be declared unschedulable, if not carefully analyzed. The schedulability and response-time analysis in the presence of self-triggered controllers is still an open problem and the topic of this paper.

  • 258.
    Amiri, Shahnaz
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten. University of Gavle, Sweden.
    Weinberger, Gottfried
    University of Gävle, Sweden.
    Increased cogeneration of renewable electricity through energy cooperation in a Swedish district heating system - A case study2018Inngår i: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 116, s. 866-877Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present study of the district heating (DH) system in the city of Kisa, Sweden, shows how, through energy cooperation with a nearby sawmill and paper mill, a local energy company contributes to energy efficient DH and cost-effective utilization of a new biofuel combined heat and power (CHP) plant. Cases of stand-alone and integrated energy systems are optimized with the linear program MODEST. The European power market is assumed to be fully deregulated. The results show clear advantages for the energy company to cooperate with these industries to produce heat for DH and process steam for industry. The cooperating industries gain advantages from heat and/or biofuel by-product supply as well. The opening to use a biofuel CHP plant for combined heat supply results in cogenerated electricity of almost 29 GWh/a with an increased biofuel use of 13 GWhia, zero fuel oil use and CO2 emission reductions of 25,800 tons CO2/a with coal-condensing power plant on the margin and biofuel as limited resource. The total system cost decreases by -2.18 MEUR/a through extended cooperation and renewable electricity sales. The sensitivity analysis shows that the profitability of investing in a biofuel CHP plant increases with higher electricity and electricity certificate prices. (C) 2017 Elsevier Ltd. All rights reserved.

  • 259.
    Amlinger, Anton
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    An Evaluation of Clustering and Classification Algorithms in Life-Logging Devices2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Using life-logging devices and wearables is a growing trend in today’s society. These yield vast amounts of information, data that is not directly overseeable or graspable at a glance due to its size. Gathering a qualitative, comprehensible overview over this quantitative information is essential for life-logging services to serve its purpose.

    This thesis provides an overview comparison of CLARANS, DBSCAN and SLINK, representing different branches of clustering algorithm types, as tools for activity detection in geo-spatial data sets. These activities are then classified using a simple model with model parameters learned via Bayesian inference, as a demonstration of a different branch of clustering.

    Results are provided using Silhouettes as evaluation for geo-spatial clustering and a user study for the end classification. The results are promising as an outline for a framework of classification and activity detection, and shed lights on various pitfalls that might be encountered during implementation of such service.

  • 260.
    Amloy, Supaluck
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan. Department of Physics, Faculty of Science, Thaksin University, 93110 Phattalung, Thailand .
    Yu, K. H.
    Linköpings universitet, Institutionen för fysik, kemi och biologi.
    Karlsson, K Fredrik
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.
    Farivar, R.
    Applied Semiconductor Physics, Department of Microtechnology and Nanoscience, Chalmers University of Technology, S‐41296 Göteborg, Sweden.
    Andersson, T. G.
    Applied Semiconductor Physics, Department of Microtechnology and Nanoscience, Chalmers University of Technology, S‐41296 Göteborg, Sweden.
    Holtz, Per-Olof
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.
    Polarized Emission from Single GaN Quantum Dots Grown by Molecular Beam Epitaxy2011Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Polarization resolved microphotoluminescence measurements of single MBE‐grown GaN/Al(Ga)N quantum dots (QDs) have been performed. The exciton and biexciton peaks with full width at half maximum as narrow as <500 μeV  were observed. Interestingly, there exist both positive and negative binding energies of the biexciton, explained in term of different sizes of the measured dots, resulting in different built‐in electric field. Moreover, a strongly linearly polarized emission is observed for the investigated dots with a degree of linear polarization of about 0.9, interpreted as the valence‐band mixing induced by in‐plane anisotropy due to strain and/or QD shape.

  • 261.
    Ammenberg, Jonas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Biogas Research Center. Linköpings universitet, Tekniska fakulteten. Linköping University, Biogas Research Center (BRC).
    Anderberg, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Biogas Research Center. Linköpings universitet, Tekniska fakulteten.
    Lönnqvist, Tomas
    Division of Energy Processes, Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden.
    Grönkvist, Stefan
    Division of Energy Processes, Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden.
    Sandberg, Thomas
    Department of Industrial Economics and Management, Royal Institute of Technology, Stockholm, Sweden.
    Biogas in the transport sector: Actor and policy analysis focusing on the demand side in the Stockholm region2018Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 129, s. 70-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Sweden has ambitions to phase out fossil fuels and significantly increase the share of biofuels it uses. This articlefocuses on Stockholm County and biogas, with the aim to increase the knowledge about regional preconditions.Biogas-related actors have been interviewed, focusing on the demand side. Biogas solutions play an essentialrole, especially regarding bus transports and taxis. Long-term development has created well-functioning sociotechnicalsystems involving collaboration. However, uncertainties about demand and policy cause hesitation andsigns of stagnating development.Public organizations are key actors regarding renewables. For example, Stockholm Public Transport procuresbiogas matching the production at municipal wastewater treatment plants, the state-owned company Swedaviasteers via a queuing system for taxis, and the municipalities have shifted to “environmental cars”.There is a large interest in electric vehicles, which is expected to increase significantly, partially due tosuggested national policy support. The future role of biogas will be affected by how such an expansion comesabout. There might be a risk of electricity replacing biogas, making it more challenging to reach a fossil-freevehicle fleet. Policy issues strongly influence the development. The environmental car definition is of importance,but its limited focus fails to account for several different types of relevant effects. The dynamic policylandscape with uncertainties about decision makers’ views on biogas seems to be one important reason behindthe decreased pace of development. A national, long-term strategy is missing. Both the European Union andSweden have high ambitions regarding a bio-based and circular economy, which should favor biogas solutions.

    Fulltekst tilgjengelig fra 2019-10-20 10:58
  • 262.
    Ammenberg, Jonas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Biogas Research Center.
    Bohn, Irene
    Den Kgl. Veterinær- og Landbohøjskole, Denmark.
    Feiz, Roozbeh
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Biogas Research Center.
    Systematic assessment of feedstock for an expanded biogas production: A multi-criteria approach2017Rapport (Annet vitenskapelig)
    Abstract [en]

    Biogas solutions can contribute to more renewable and local energy systems, and also involve other essential aspects such as nutrient recycling. From a theoretical feedstock perspective there is a great biogas potential in Sweden, but the development has been relatively slow as many biogas producers face challenges of different types. Among the many influencing factors, the choice of feedstocks (biomass) is of strategic importance. Within the Biogas Research Center (BRC), hosted by Linköping University in Sweden, a research project focused on feedstock has been ongoing for several years. It has involved researchers, biogas and biofertilizer producers, agricultural organizations and others. The main aim has been to develop a method to assess the suitability of feedstock for biogas and biofertilizer production, and to apply this method on a few selected feedstocks. A multi-criteria method has been developed that covers potential, feasibility and resource efficiency, operationalized via 17 indicators directed towards cost efficiency, technological feasibility, energy and environmental performance, accessibility, competition, policy and other issues. Thus the method it is relatively comprehensive, yet hopefully simple enough to be used by practitioners.

    The main ambition, applying the method, has been to collect and structure relevant information to facilitate strategic overviews, communication and informed decision making. This is relevant for development within the biogas and biofertilizer industry, for policymakers, to define and prioritize among essential research projects, etc. This report presents some essential parts of this project, focusing on the multi-criteria method and results regarding ley crops, straw, farmed blue mussels and food waste (and stickleback to some extent). It clarifies how the method can be applied and highlights barriers, drivers and opportunities for each feedstock. Comparisons are also made. The results indicate that biogas production from food waste and ley crops is the most straightforward, and for straw and farmed blue mussels there are more obstacles to overcome. For all of them, the dynamic and very uncertain policy landscape is a barrier. In the final chapter, some conclusions about the method and its application are drawn.

  • 263.
    Ammenberg, Jonas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Feiz, Roozbeh
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Assessment of Feedstocks for Biogas Production, Part II: Results for Strategic Decision Making2017Inngår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 122, s. 388-404Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Biogas production is essentially based on organic materials and biological processes; hence it can contribute to the transition toward a biobased economy. Biogas is a biofuel that can contribute to a more renewable and local energy system. In comparison with other biofuels, biogas is more flexible and can be produced from many different types of feedstock, including biomass containing various shares of carbohydrates, lipids and, both from primary and secondary raw materials. However, a significantly expanded biogas production is dependent on good business conditions, in turn related to societal acceptance and support. There are many factors that can make a biogas solution more or less suitable for both producers and the broader society. Among the many influencing factors, the choice of feedstocks (biomass) for producing biogas and biofertilizer is of strategic importance. But, to assess the suitability is complicated, because it is linked to many different challenges such as cost, energy balance, environmental impacts, institutional conditions, available technologies, geographical conditions, alternative and competing interest, and so on. Suitability includes aspects related to feasibility for implementation, potential for renewable energy and nutrient recycling, and resource efficiency. In this article, a multi-criteria framework, which is proposed in a companion article (Part II), is used to assess the suitability of four types of feedstocks for producing biogas (considering Swedish conditions). The assessed feedstocks are ley crops, straw, farmed blue mussels, and source-sorted food waste. The results have synthesized and structured a lot of information, which facilitates considerably for those that want an overview and to be able to review several different areas simultaneously. Among the assessed feedstocks, biogas production from household food waste and ley is the most straightforward. For straw and farmed blue mussels, there are more obstacles to overcome including some significant barriers. For all feedstock there are challenges related to the institutional conditions. The assessment contributes to the knowledge about sustainable use of these feedstocks, and the limitations and opportunities for biogas development. It supports more informed decision making, both in industry and policy. Existing, or forthcoming, biogas and biofertilizer producers who are considering altering or expanding their production systems can benefit from a better understanding of different choices of feedstock that are or can be (potentially) at their disposal; thus, identify hotspots, weak points, and possible candidates for implementation in future. This research is performed within the Biogas Research Center (BRC), which is a transdisciplinary center of excellence with the overall goal of promoting resource-efficient biogas solutions in Sweden. The BRC is funded by the Energy Agency of Sweden, Linköping University, and more than 20 partners from academia, industry, municipalities and other several public and private organizations.

  • 264.
    Amsallem, David
    et al.
    Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305-4035, USA.
    Nordström, Jan
    Linköpings universitet, Matematiska institutionen, Beräkningsmatematik. Linköpings universitet, Tekniska fakulteten.
    Energy Stable Model Reduction of Neurons by Non-negative Discrete Empirical Interpolation2016Inngår i: SIAM Journal on Scientific Computing, ISSN 1064-8275, E-ISSN 1095-7197, Vol. 38, nr 2, s. B297-B326Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The accurate and fast prediction of potential propagation in neuronal networks is of prime importance in neurosciences. This work develops a novel structure-preserving model reduction technique to address this problem based on Galerkin projection and nonnegative operator approximation. It is first shown that the corresponding reduced-order model is guaranteed to be energy stable, thanks to both the structure-preserving approach that constructs a distinct reduced-order basis for each cable in the network and the preservation of nonnegativity. Furthermore, a posteriori error estimates are provided, showing that the model reduction error can be bounded and controlled. Finally, the application to the model reduction of a large-scale neuronal network underlines the capability of the proposed approach to accurately predict the potential propagation in such networks while leading to important speedups.

  • 265.
    Anaby, Dana
    et al.
    School of Physical and Occupational Therapy, McGill University, Montreal, Canada.
    Vrotsou, Katerina
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
    Kroksmark, Ulla
    Sahlgrenska Academy, Institute of Neuroscience and Physiology, University of Gothenburg, Göteburg, Sweden.
    Ellegård, Kajsa
    Linköpings universitet, Institutionen för tema, Tema teknik och social förändring. Linköpings universitet, Filosofiska fakulteten.
    Changes in participation patterns of youth with physical disabilities following the Pathways and Resources for Engagement and Participation intervention: A time-geography approach2019Inngår i: Scandinavian Journal of Occupational Therapy, ISSN 1103-8128, E-ISSN 1651-2014Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: The PREP (Pathways and Resources for Engagement and Participation), an innovative 12-week occupational therapy intervention that focuses on changing the environment, was found effective in improving the participation of youth in specific chosen community-based activities.

    Objective: To complement existing evidence, this study explored changes in overall participation patterns of youth with physical disabilities following the PREP intervention.

    Methods: Guided by time-geography approach, 13 youth aged 12–17 completed a 24-hr diary using the Aday app during one typical weekday and another day during the weekend, pre- and post-intervention. Data of 50 diaries were plotted and analyzed using the VISUALTimePAcTS program.

    Results: Following the PREP, youth were engaged in less digital media and more in study-related activities. Number of occurrences and time spent doing activities with friends were greater post-intervention, whereas time spent doing activities at home was quite similar, particularly during the weekdays. During the weekends, however, youth spent slightly less time at home.

    Conclusions and significance: Findings provide preliminary support for the effectiveness of the PREP, extending beyond the accomplishment of specific targeted activities towards a change in the overall daily patterns of youth. Such knowledge can redirect occupational therapists’ attention to environment-focused interventions involving real-life experiences.

  • 266.
    Anandapadamanaban, Madhanagopal
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Structural insights into protein-protein interactions governing regulation in transcription initiation and ubiquitination2015Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Virtually every aspect of the cellular processes in eukaryotes requires that the interactions between protein molecules are well coordinated in different regulatory pathways. Any protein dysfunction involved in these regulatory pathways might lead to various pathological conditions. Understanding the structural and functional peculiarities of these proteins molecular machineries will help in formulating structure-based drug design.

    The first regulatory process studied here is the RNA polymerase-II mediated transcription of the eukaryotic protein-coding genes to produce mRNAs. This process requires the formation of the ‘transcription initiation’ by the assembly of Pre-Initiation Complex (PIC) formation at a core promoter region. Regulation at this initiation level is a key mechanism for the control of gene expression that governs cellular growth and differentiation. The transcription Factor IID (TFIID) is a conserved multiprotein general transcription factor with an essential role in  nucleating the PIC formation, composed of TATA Binding Protein (TBP) and about 14 TBP Associated Factors (TAFs). The here presented crystal structure (1.97Å) of TBP bound to TAND1 and TAND2 domains from TAF1 reveals a detailed molecular pattern of interactions involving both transcriptionally activating and repressing regions in TBP, thereby uncovering central principles for anchoring of TBP-binding motifs. Together with NMR and cellular analysis, this work provides the structural basis of competitive binding with TFIIA to modulate TBP in promoter recognition.

    In eukaryotes, another fundamental mechanism in the regulation of cellular physiology is the posttranslational modification of substrate proteins by ubiquitin, termed ‘ubiquitination’. Important actors in this mechanism are the ubiquitin-ligases (E3s) that culminate the transfer of ubiquitin to the substrate and govern the specificity of this system. One E3 ligase in particular, TRIM21, defines a subgroup of the Tripartite Motif (TRIM) family, which belongs to the major RING-type of E3 ubiquitin ligases, and plays an important role in pathogenesis of autoimmunity by mediating ubiquitination of transcription factors. The crystal structure (2.86Å) of the RING domain from TRIM21 in complex with UBE2E1, an E2 conjugating enzyme, together with the NMR and SAXS analysis as well as biochemical functional analysis, reveals the molecular basis for the dynamic binding interfaces. The TRIM21 mode of ubiquitin recognition and activation for catalytic transfer of ubiquitin can be modeled onto the entire TRIM family.

    Finally, we explored the concepts of conformational selection in proteins as a possible key component for protein-mediated transcriptional regulation. In this framework, MexR, a bacterial repressor of the MexAB-OprM efflux pump, and its mutant Arg21Trp were studied as an example for proteins presenting different conformations. The residue Arg21Trp mutation is clinically identified to cause of Multi-Drug Resistant (MDR) by attenuated DNA binding, and leads to the overexpression of the MexAB-OprM efflux pump. With the crystal structure (2.19Å) of MexR mutant Arg21Trp, in combination with MD-simulations and SAXS for both wild-type and mutant, we could unravel the atomic details of the wild-type conformations consisting in subsets of populations of DNA bound and unbound forms. Remarkably, the mutant Arg21Trp stabilize the DNA unbound state and shifts MexR in a pre-existing equilibrium, from a repressed to a derepressed state.

    Taken together, these studies substantially broaden our knowledge at a molecular level in protein interactions that are involved in transcriptional regulation and ubiquitination, studied by a carefully selected combination of complementary structural methods spanning different resolutions and time scales.

    Delarbeid
    1. High-resolution structure of TBP with TAF1 reveals anchoring patterns in transcriptional regulation
    Åpne denne publikasjonen i ny fane eller vindu >>High-resolution structure of TBP with TAF1 reveals anchoring patterns in transcriptional regulation
    Vise andre…
    2013 (engelsk)Inngår i: Nature Structural & Molecular Biology, ISSN 1545-9993, E-ISSN 1545-9985, Vol. 20, nr 8, s. 1008-+Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The general transcription factor TFIID provides a regulatory platform for transcription initiation. Here we present the crystal structure (1.97 angstrom) and NMR analysis of yeast TAF1 N-terminal domains TAND1 and TAND2 bound to yeast TBP, together with mutational data. We find that yeast TAF1-TAND1, which in itself acts as a transcriptional activator, binds TBPs concave DNA-binding surface by presenting similar anchor residues to TBP as does Mot1 but from a distinct structural scaffold. Furthermore, we show how TAF1-TAND2 uses an aromatic and acidic anchoring pattern to bind a conserved TBP surface groove traversing the basic helix region, and we find highly similar TBP-binding motifs also presented by the structurally distinct TFIIA, Mot1 and Brf1 proteins. Our identification of these anchoring patterns, which can be easily disrupted or enhanced, provides insight into the competitive multiprotein TBP interplay critical to transcriptional regulation.

    sted, utgiver, år, opplag, sider
    NATURE PUBLISHING GROUP, 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA, 2013
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-96977 (URN)10.1038/nsmb.2611 (DOI)000322715300016 ()
    Merknad

    Funding Agencies|Swedish Research Council|621-2011-6028621-2012-5250621-2012-5136|VINNOVA|P32045-1|Swedish Cancer Foundation|11 0681|Swedish Child Cancer Foundation|PROJ09/092|Forum Scientium Award||Canadian Institutes for Health Research|MT-13611|Japan Society for the Promotion of Science|23370077|Knut and Alice Wallenberg foundation||Canada Research Chair||

    Tilgjengelig fra: 2013-09-05 Laget: 2013-09-02 Sist oppdatert: 2017-12-06
    2. Mutation-Induced Population Shift in the MexR Conformational Ensemble Disengages DNA Binding: A Novel Mechanism for MarR Family Derepression
    Åpne denne publikasjonen i ny fane eller vindu >>Mutation-Induced Population Shift in the MexR Conformational Ensemble Disengages DNA Binding: A Novel Mechanism for MarR Family Derepression
    Vise andre…
    2016 (engelsk)Inngår i: Structure, ISSN 0969-2126, E-ISSN 1878-4186, Vol. 24, nr 8, s. 1311-1321Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    MexR is a repressor of the MexAB-OprM multidrug efflux pump operon of Pseudomonas aeruginosa, where DNA-binding impairing mutations lead to multidrug resistance (MDR). Surprisingly, the crystal structure of an MDR-conferring MexR mutant R21W (2.19 angstrom) presented here is closely similar to wildtype MexR. However, our extended analysis, by molecular dynamics and small-angle X-ray scattering, reveals that the mutation stabilizes a ground state that is deficient of DNA binding and is shared by both mutant and wild-type MexR, whereas the DNA-binding state is only transiently reached by the more flexible wild-type MexR. This population shift in the conformational ensemble is effected by mutation-induced allosteric coupling of contact networks that are independent in the wild-type protein. We propose that the MexR-R21W mutant mimics derepression by small-molecule binding to MarR proteins, and that the described allosteric model based on population shifts may also apply to other MarR family members.

    sted, utgiver, år, opplag, sider
    CELL PRESS, 2016
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-131908 (URN)10.1016/j.str.2016.06.008 (DOI)000383244600012 ()27427478 (PubMedID)
    Merknad

    Funding Agencies|European Communitys Seventh Framework Program (FP7) under BioStruct-X [283570]; Swedish e-Science Research Center; Swedish Research Council; Tage Erlander Visiting Professor grant.

    The original status of this article was Manuscript and the titel was Population shift disengages DNA binding in a multidrug resistance MexR mutant.

    Tilgjengelig fra: 2016-10-13 Laget: 2016-10-11 Sist oppdatert: 2018-05-06
    3. Anti-Ro52 Autoantibodies from Patients with Sjögren's Syndrome Inhibit the Ro52 E3 Ligase Activity by Blocking the E3/E2 Interface
    Åpne denne publikasjonen i ny fane eller vindu >>Anti-Ro52 Autoantibodies from Patients with Sjögren's Syndrome Inhibit the Ro52 E3 Ligase Activity by Blocking the E3/E2 Interface
    Vise andre…
    2011 (engelsk)Inngår i: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 286, nr 42, s. 36478-36491Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Ro52 (TRIM21) is an E3 ligase of the tripartite motif family that negatively regulates proinflammatory cytokine production by ubiquitinating transcription factors of the interferon regulatory factor family. Autoantibodies to Ro52 are present in patients with lupus and Sjögren's syndrome, but it is not known if these autoantibodies affect the function of Ro52. To address this question, the requirements for Ro52 E3 ligase activity were first analyzed in detail. Scanning a panel of E2 ubiquitin-conjugating enzymes, we found that UBE2D1–4 and UBE2E1–2 supported the E3 ligase activity of Ro52 and that the E3 ligase activity of Ro52 was dependent on its RING domain. We also found that the N-terminal extensions in the class III E2 enzymes affected their interaction with Ro52. Although the N-terminal extension in UBE2E3 made this E2 enzyme unable to function together with Ro52, the N-terminal extensions in UBE2E1 and UBE2E2 allowed for a functional interaction with Ro52. Anti-Ro52-positive patient sera and affinity-purified anti-RING domain autoantibodies inhibited the E3 activity of Ro52 in ubiquitination assays. Using NMR, limited proteolysis, ELISA, and Ro52 mutants, we mapped the interactions between Ro52, UBE2E1, and anti-Ro52 autoantibodies. We found that anti-Ro52 autoantibodies inhibited the E3 ligase activity of Ro52 by sterically blocking the E2/E3 interaction between Ro52 and UBE2E1. Our data suggest that anti-Ro52 autoantibodies binding the RING domain of Ro52 may be actively involved in the pathogenesis of rheumatic autoimmune disease by inhibiting Ro52-mediated ubiquitination.

    sted, utgiver, år, opplag, sider
    American Society for Biochemistry and Molecular Biology, 2011
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-53170 (URN)10.1074/jbc.M111.241786 (DOI)000296538300033 ()
    Merknad

    Funding agencies|Swedish Research Council||Swedish Foundation for Strategic Research||VINNOVA||CeNano||Swedish Cancer Society||Karolinska Institutet||Linkoping University||King Gustaf Vs 80-Year Foundation||Heart-Lung Foundation||Stockholm County Council||Gustafsson Foundation||Soderberg Foundation||National Cancer Institute of Canada||Swedish Rheumatism Association||Wallenberg Foundation||

    Tilgjengelig fra: 2010-01-18 Laget: 2010-01-18 Sist oppdatert: 2017-12-12bibliografisk kontrollert
    4. Structure of a TRIM21 - UBE2El complex reveals the specificity of E2 and ubiquitin recognition by TRIM E3 RINGs
    Åpne denne publikasjonen i ny fane eller vindu >>Structure of a TRIM21 - UBE2El complex reveals the specificity of E2 and ubiquitin recognition by TRIM E3 RINGs
    Vise andre…
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    TRIM21, a RlNG-containing E3 ubiquitin-ligase of the TRIM   protein family, is a major autoantigen in SLE and Sjögren's syndrome as well as a modifier of interferon regulatory factors, thereby regulating innate immune signalling. We herein report the 2.86 Å crystal structure ofhuman TRIM211-91 comprising the RING domain (residues 16-55), in complex with the human E2 conjugating UBE2El enzyme (also denoted UbcH6). The crystal structure, joint with analysis by NMR and SAXS as well as structure-directed mutations and functional assays provides a detailed view of the specificity-determining contacts that support specific E2 recognition in the TRIM family. A detailed comparison of our structure with known E2 bound ubiquitin complexes, supported by biochemical analyses, reveals the molecular basis for TRIM21 interactions with donor ubiquitin that activates catalytic ubiquitin transfer. Finally, our structure convincingly demonstrates the placement of the Ub-targeted Lys61 of the adjacent TRIM211- 91 close to the catalytically active UBE2El cysteine, and how the Lys61 amide is activated fora nucleophilic attack by hydrogen-bondeffected deshielding by conserved acidic residues at the E2 active site. In all, our structural findings provide molecular details ofthe selectivity involved in TRIM21 interactions with its cognate UBE2E1 enzyme and how TRIM21 positions ubiquitin in a catalytic conformation for ubiquitin transfer, and presents a snapshot of the Ub ligation step on a specific target residue of TRIM211-91 as an auto-ubiquitinated pseudo-substrate at high concentration. Increased structural and functional understanding of the TRIM mediated ubiquitination will aid development ofnovel therapeutic approaches in the entire TRIM family ofproteins.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-122466 (URN)
    Tilgjengelig fra: 2015-11-03 Laget: 2015-11-03 Sist oppdatert: 2015-11-13bibliografisk kontrollert
  • 267.
    Anandapadamanaban, Madhanagopal
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten.
    Kyriakidis, Nikolaos C.
    Karolinska Univ Hosp, Sweden; UDLA, Ecuador.
    Csizmok, Veronika
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Wallenhammar, Amélie
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Espinosa, Alexander C.
    Karolinska Univ Hosp, Sweden.
    Ahlner, Alexandra
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Round, Adam R.
    Grenoble Outstn, France; European XFEL GmbH, Germany.
    Trewhella, Jill
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten. Univ Sydney, Australia.
    Moche, Martin
    Karolinska Inst, Sweden.
    Wahren-Herlenius, Marie
    Karolinska Univ Hosp, Sweden.
    Sunnerhagen, Maria
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    E3 ubiquitin-protein ligase TRIM21-mediated lysine capture by UBE2E1 reveals substrate-targeting mode of a ubiquitin-conjugating E22019Inngår i: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, JOURNAL OF BIOLOGICAL CHEMISTRY, Vol. 294, nr 30, s. 11404-11419Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The E3 ubiquitin-protein ligase TRIM21, of the RING-containing tripartite motif (TRIM) protein family, is a major autoantigen in autoimmune diseases and a modulator of innate immune signaling. Together with ubiquitin-conjugating enzyme E2 E1 (UBE2E1), TRIM21 acts both as an E3 ligase and as a substrate in autoubiquitination. We here report a 2.82-angstrom crystal structure of the human TRIM21 RING domain in complex with the human E2-conjugating UBE2E1 enzyme, in which a ubiquitin-targeted TRIM21 substrate lysine was captured in the UBE2E1 active site. The structure revealed that the direction of lysine entry is similar to that described for human proliferating cell nuclear antigen (PCNA), a small ubiquitin-like modifier (SUMO)-targeted substrate, and thus differs from the canonical SUMO-targeted substrate entry. In agreement, we found that critical UBE2E1 residues involved in the capture of the TRIM21 substrate lysine are conserved in ubiquitin-conjugating E2s, whereas residues critical for SUMOylation are not conserved. We noted that coordination of the acceptor lysine leads to remodeling of amino acid side-chain interactions between the UBE2E1 active site and the E2-E3 direct interface, including the so-called linchpin residue conserved in RING E3s and required for ubiquitination. The findings of our work support the notion that substrate lysine activation of an E2-E3-connecting allosteric path may trigger catalytic activity and contribute to the understanding of specific lysine targeting by ubiquitin-conjugating E2s.

  • 268.
    Anandapadamanaban, Madhanagopal
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Kyriakidis, Nikolaos
    Rheumatology Unit, Department of Medicine, Center for Molecular Medicine L8:04, Karolinska Institutet, Stockholm, Sweden.
    Espinosa, Alexander
    Rheumatology Unit, Department of Medicine, Center for Molecular Medicine L8:04, Karolinska Institutet, Stockholm, Sweden.
    Round, Adam R.
    European Molecular Biology Laboratory, Grenoble Outstation, Grenoble, France.
    Trewhella, Jill
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten. School of Molecular Bioscience, The University of Sydney, New South Wales, Australia.
    Wahren-Herlenius, Marie
    Rheumatology Unit, Department of Medicine, Center for Molecular Medicine L8:04, Karolinska Institutet, Stockholm, Sweden.
    Moche, Martin
    Department of Medical Biochemistry and Biophysics, Protein Science Facility, Karolinska Institutet, Stockholm, Sweden.
    Sunnerhagen, Maria
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Structure of a TRIM21 - UBE2El complex reveals the specificity of E2 and ubiquitin recognition by TRIM E3 RINGsManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    TRIM21, a RlNG-containing E3 ubiquitin-ligase of the TRIM   protein family, is a major autoantigen in SLE and Sjögren's syndrome as well as a modifier of interferon regulatory factors, thereby regulating innate immune signalling. We herein report the 2.86 Å crystal structure ofhuman TRIM211-91 comprising the RING domain (residues 16-55), in complex with the human E2 conjugating UBE2El enzyme (also denoted UbcH6). The crystal structure, joint with analysis by NMR and SAXS as well as structure-directed mutations and functional assays provides a detailed view of the specificity-determining contacts that support specific E2 recognition in the TRIM family. A detailed comparison of our structure with known E2 bound ubiquitin complexes, supported by biochemical analyses, reveals the molecular basis for TRIM21 interactions with donor ubiquitin that activates catalytic ubiquitin transfer. Finally, our structure convincingly demonstrates the placement of the Ub-targeted Lys61 of the adjacent TRIM211- 91 close to the catalytically active UBE2El cysteine, and how the Lys61 amide is activated fora nucleophilic attack by hydrogen-bondeffected deshielding by conserved acidic residues at the E2 active site. In all, our structural findings provide molecular details ofthe selectivity involved in TRIM21 interactions with its cognate UBE2E1 enzyme and how TRIM21 positions ubiquitin in a catalytic conformation for ubiquitin transfer, and presents a snapshot of the Ub ligation step on a specific target residue of TRIM211-91 as an auto-ubiquitinated pseudo-substrate at high concentration. Increased structural and functional understanding of the TRIM mediated ubiquitination will aid development ofnovel therapeutic approaches in the entire TRIM family ofproteins.

  • 269.
    Anandapadmanaban, Madhanagopal
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten.
    Pilstål, Robert
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Bioinformatik. Linköpings universitet, Tekniska fakulteten.
    Andrésen, Cecilia
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Trewhella, Jill
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten. University of Sydney, Australia.
    Moche, Martin
    Karolinska Institute, Sweden.
    Wallner, Björn
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Bioinformatik. Linköpings universitet, Tekniska fakulteten.
    Sunnerhagen, Maria
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemi. Linköpings universitet, Tekniska fakulteten.
    Mutation-Induced Population Shift in the MexR Conformational Ensemble Disengages DNA Binding: A Novel Mechanism for MarR Family Derepression2016Inngår i: Structure, ISSN 0969-2126, E-ISSN 1878-4186, Vol. 24, nr 8, s. 1311-1321Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    MexR is a repressor of the MexAB-OprM multidrug efflux pump operon of Pseudomonas aeruginosa, where DNA-binding impairing mutations lead to multidrug resistance (MDR). Surprisingly, the crystal structure of an MDR-conferring MexR mutant R21W (2.19 angstrom) presented here is closely similar to wildtype MexR. However, our extended analysis, by molecular dynamics and small-angle X-ray scattering, reveals that the mutation stabilizes a ground state that is deficient of DNA binding and is shared by both mutant and wild-type MexR, whereas the DNA-binding state is only transiently reached by the more flexible wild-type MexR. This population shift in the conformational ensemble is effected by mutation-induced allosteric coupling of contact networks that are independent in the wild-type protein. We propose that the MexR-R21W mutant mimics derepression by small-molecule binding to MarR proteins, and that the described allosteric model based on population shifts may also apply to other MarR family members.

  • 270.
    Anany, Hossam
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Effectiveness of a speed advisory traffic signal system for Conventional and Automated vehicles in a smart city2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis project presents a traffic micro simulation study that investigates the state-of-the-art in traffic management "Green Light Optimal Speed Advisory (GLOSA)" for vehicles in a smart city. GLOSA utilizes infrastructure and vehicles communication through using current signal plan settings and updated vehicular information in order to influence the intersection approach speeds. The project involves simulations for a mixed traffic environment of conventional and automated vehicles both connected to the intersection control and guided by a speed advisory traffic management system. Among the project goals is to assess the effects on traffic performance when human drivers comply to the speed advice. The GLOSA management approach is also accessed for its potential to improve traffic efficiency in a full market penetration of connected automated vehicles with enhanced capabilities such as having shorter time head ways.

  • 271.
    Anasori, Babak
    et al.
    Drexel University, PA 19104 USA; Drexel University, PA 19104 USA.
    Dahlqvist, Martin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Halim, Joseph
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten. Drexel University, PA 19104 USA.
    Ju Moon, Eun
    Drexel University, PA 19104 USA.
    Lu, Jun
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Hosler, Brian C.
    Drexel University, PA 19104 USA.
    Caspi, Elad N.
    Drexel University, PA 19104 USA; Nucl Research Centre Negev, Israel.
    May, Steven J.
    Drexel University, PA 19104 USA.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Eklund, Per
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Rosén, Johanna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Barsoum, Michel W.
    Drexel University, PA 19104 USA.
    Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC32015Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, nr 9, s. 094304-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Herein, we report on the phase stabilities and crystal structures of two newly discovered ordered, quaternary MAX phases-Mo2TiAlC2 and Mo2Ti2AlC3-synthesized by mixing and heating different elemental powder mixtures of mMo:(3-m) Ti:1.1Al:2C with 1.5 less than= m less than= 2.2 and 2Mo: 2Ti:1.1Al:2.7C to 1600 degrees C for 4 h under Ar flow. In general, for m greater than= 2 an ordered 312 phase, (Mo2Ti) AlC2, was the majority phase; for mless than 2, an ordered 413 phase (Mo2Ti2)AlC3, was the major product. The actual chemistries determined from X-ray photoelectron spectroscopy (XPS) are Mo2TiAlC1.7 and Mo2Ti1.9Al0.9C2.5, respectively. High resolution scanning transmission microscopy, XPS and Rietveld analysis of powder X-ray diffraction confirmed the general ordered stacking sequence to be Mo-Ti-Mo-Al-Mo-Ti-Mo for Mo2TiAlC2 and Mo-Ti-Ti-Mo-Al-Mo-Ti-Ti-Mo for Mo2Ti2AlC3, with the carbon atoms occupying the octahedral sites between the transition metal layers. Consistent with the experimental results, the theoretical calculations clearly show that M layer ordering is mostly driven by the high penalty paid in energy by having the Mo atoms surrounded by C in a face-centered configuration, i.e., in the center of the Mn+1Xn blocks. At 331 GPa and 367 GPa, respectively, the Youngs moduli of the ordered Mo2TiAlC2 and Mo2Ti2AlC3 are predicted to be higher than those calculated for their ternary end members. Like most other MAX phases, because of the high density of states at the Fermi level, the resistivity measurement over 300 to 10K for both phases showed metallic behavior. (C) 2015 AIP Publishing LLC.

  • 272.
    Anasori, Babak
    et al.
    Drexel Univ, PA 19104 USA; Drexel Univ, PA 19104 USA.
    Lu, Jun
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Rivin, Oleg
    Nucl Res Ctr Negev, Israel.
    Dahlqvist, Martin
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Halim, Joseph
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Voigt, Cooper
    Drexel Univ, PA 19104 USA.
    Rosén, Johanna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Barsoum, Michel W.
    Drexel Univ, PA 19104 USA.
    Caspi, Elad N.
    Drexel Univ, PA 19104 USA; Nucl Res Ctr Negev, Israel.
    A Tungsten-Based Nanolaminated Ternary Carbide: (W,Ti)(4)C4-x2019Inngår i: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 58, nr 2, s. 1100-1106Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nanolamellar transition metal carbides are gaining increasing interests because of the recent developments of their twodimensional (2D) derivatives and promising performance for a variety of applications from energy storage, catalysis to transparent conductive coatings, and medicine. To develop more novel 2D materials, new nanolaminated structures are needed. Here we report on a tungsten based nanolaminated ternary phase, (W,Ti)(4)C4-x, synthesized by an Al catalyzed reaction of W, Ti, and C powders at 1600 degrees C for 4 h, under flowing argon. X-ray and neutron diffraction, along with Z-contrast scanning transmission electron microscopy, were used to determine the atomic structure, ordering, and occupancies. This phase has a layered hexagonal structure (P6(3)/mmc) with lattice parameters, a = 3.00880(7) angstrom, and c = 19.5633(6) angstrom and a nominal chemistry of (W,Ti)(4)C4-x (actual chemistry, W2.1(1)Ti1.6(1)C2.6(1)). The structure is comprised of layers of pure W that are also twin planes with two adjacent atomic layers of mixed W and Ti, on either side. The use of Al as a catalyst for synthesizing otherwise difficult to make phases, could in turn lead to the discovery of a large family of nonstoichiometric ternary transition metal carbides, synthesized at relatively low temperatures and shorter times.

    Fulltekst tilgjengelig fra 2020-01-04 16:13
  • 273.
    Anasori, Babak
    et al.
    Drexel University, PA 19104 USA; Drexel University, PA 19104 USA.
    Xie, Yu
    Oak Ridge National Lab, TN 37831 USA.
    Beidaghi, Majid
    Drexel University, PA 19104 USA; Drexel University, PA 19104 USA.
    Lu, Jun
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Hosler, Brian C.
    Drexel University, PA 19104 USA.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Kent, Paul R. C.
    Oak Ridge National Lab, TN 37831 USA; Oak Ridge National Lab, TN 37831 USA.
    Gogotsi, Yury
    Drexel University, PA 19104 USA; Drexel University, PA 19104 USA.
    Barsoum, Michel W.
    Drexel University, PA 19104 USA.
    Two-Dimensional, Ordered, Double Transition Metals Carbides (MXenes)2015Inngår i: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 9, nr 10, s. 9507-9516Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The higher the chemical diversity and structural complexity of two-dimensional (2D) materials, the higher the likelihood they possess unique and useful properties. Herein, density functional theory (DFT) is used to predict the existence of two new families of 2D ordered, carbides (MXenes), MM-2 C-2 and MM-2 C-2(3), where M and M are two different early transition metals. In these solids, M layers sandwich M" carbide layers. By synthesizing Mo2TiC2Tx, Mo2Ti2C3Tx, and Cr2TiC2Tx (where T is a surface termination), we validated the DFT predictions. Since the Mo and Cr atoms are on the outside, they control the 2D flakes chemical and electrochemical properties. The latter was proven by showing quite different electrochemical behavior of Mo2TiC2Tx and Ti3C2Tx. This work further expands the family of 2D materials, offering additional choices of structures, chemistries, and ultimately useful properties.

  • 274.
    Anastasopoulos, M.
    et al.
    European Spallat Source, Sweden.
    Bebb, R.
    European Spallat Source, Sweden.
    Berry, K.
    Spallat Neutron Source, TN 37831 USA.
    Birch, Jens
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Brys, T.
    European Spallat Source, Sweden.
    Buffet, J. -C.
    Institute Laue Langevin, France.
    Clergeau, J. -F.
    Institute Laue Langevin, France.
    Deen, P. P.
    European Spallat Source, Sweden.
    Ehlers, G.
    Spallat Neutron Source, TN 37831 USA.
    van Esch, P.
    Institute Laue Langevin, France.
    Everett, S. M.
    Spallat Neutron Source, TN 37831 USA.
    Guerard, B.
    Institute Laue Langevin, France.
    Hall-Wilton, R.
    European Spallat Source, Sweden; Mid Sweden University, Sweden.
    Herwig, K.
    Spallat Neutron Source, TN 37831 USA.
    Hultman, Lars
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Höglund, Carina
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten. European Spallat Source, Sweden.
    Iruretagoiena, I.
    European Spallat Source, Sweden.
    Issa, F.
    European Spallat Source, Sweden.
    Jensen, Jens
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
    Khaplanov, A.
    European Spallat Source, Sweden.
    Kirstein, O.
    European Spallat Source, Sweden; University of Newcastle, Australia.
    Lopez Higuera, I.
    European Spallat Source, Sweden.
    Piscitelli, F.
    European Spallat Source, Sweden.
    Robinson, L.
    European Spallat Source, Sweden.
    Schmidt, Susann
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten. European Spallat Source, Sweden.
    Stefanescu, I.
    European Spallat Source, Sweden.
    Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS2017Inngår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, artikkel-id P04030Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG. CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of He-3 detectors on an operational instrument. The demonstrator has an active area of 0.2m(2). It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the He-3 detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by He-3, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

  • 275.
    Anderberg, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Assessing the Contribution of Organic Agriculture: PovertyReduction and Employment Creation in Selected Value Chains2016Inngår i: Vulnerability of Agricultural Production Networks and Global Food Value Chainsdue to Natural Disasters: Book of Abstracts / [ed] Meinhard Breiling, Anbumozhi Venkatachalam, Vienna: TU Wien , 2016, s. 23-24Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Organic agriculture (OA) is increasingly viewed as an economic opportunity for farmers allover the world. This paper addresses the effects of OA in terms of income, vulnerability andpoverty alleviation in rural areas in developing countries. It is based on a literature reviewwith emphasis on two value chains: cotton and coffee, which both involve smallholders indeveloping regions, and growing organic markets, but differ in terms of value chain structuresand geographical patterns.

  • 276.
    Anderberg, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Hamnarna rustas för fartygens avloppsvatten2014Inngår i: Sjöfarten kring Sverige och dess påverkan på havsmiljön / [ed] Tina Johansen Lilja och Eva-Lotta Sundblad, Göteborg: Havsmiljöinstitutet , 2014, nr 4, s. 10-11Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [sv]

    När avloppsvatten från sjöfarten släpps ut i havet påverkar det miljön negativt genom att bakterier sprids och näringsämnen kommer ut i havet. Utsläppen är koncentrerade till farleder och hamnar och där kan effekterna vara tydliga, även om utsläppen är små i förhållande till de totala utsläppen till havet.

  • 277.
    Anderberg, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Urban green growth-myth or reality?2015Inngår i: URBACT II New Urban Economies : How can cities foster economic development and develop ‘new urban economies’ / [ed] Willem van Winden, Luis Carvalho, Saint-Denis, France: URBACT II Programme , 2015, s. 35-38Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    ‘To create the most resource-efficient region in the world’. This is the vision of Tekniska verken, the municipalityowned infrastructural company in Linköping, Sweden. It reflects the city’ s long-standing ambitions to be a ‘forerunner in climate and environmental initiatives’ and to support ‘business-driven’ environmental development, actively stimulating the development of a green economic sector. Linköping and the surrounding county of Östergötland are here used for discussing the development of the green economy in cities and regions.

  • 278.
    Anderberg, Stefan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Western harbor in Malmö2015Inngår i: Review 11. Re-inventing planning: examples from the Profession, Rotterdam, Nederländerna: International Society of City and Regional Planners , 2015, Vol. 11, s. 210-227Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    For the last 15 years Västra hamnen (Western Harbor) in Malmö, and Hammarby Sjöstad in Stockholm have been the major flagships of Swedish international eco-city ambitions. These city development projects are presented both as leading examples of the conversion of former industrial harbor areas and of environmental adaptation of densely built urban environments. Western Harbor is a centrally located former shipyard area which, since the end of the 1990s, has developed into a mixed city area for housing, schools, offices, shops and other workplaces as well as for recreational areas with beaches, parks and yacht harbors. Since its first phase, part of a housing expo in 2001, it has attracted international interest for its dense architecture, bold energy goals based on varied local renewable energy production, household waste systems, green and blue structures, and dialogue processes. By 2031, when the area is completed, it is expected to be the home for 25,000 people and 25,000 workplaces. In 2014, there were 7,300 inhabitants and more than 12,000 work places in Western Harbor, already twice of the work force of the former shipyard at its height.

  • 279.
    Anderberg, Stefan
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Kevin, Cullinane
    Företagsekonomiska institutionen, Handelshögskolan, Göteborgs universitet.
    Johansson Nikopolou, Zoi
    Företagsekonomiska institutionen, Handelshögskolan, Göteborgs universitet.
    Utsläppshandel kan vara en lönsam vägtill lägre utsläpp från sjöfarten2017Inngår i: Åtgärder för att minska sjöfartens påverkan på havsmiljön / [ed] Tina Johansen Lilja, Frida Lundberg och Eva-Lotta Sundblad., Göteborg: Havsmiljöinstitutet , 2017, s. 14-16Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [sv]

    Handel med utsläppsrätter under ett fastställt ”tak” av totalautsläpp som efterhand sänks, har i en del regioner i världenvisat sig vara en både kostnadseffektiv och framgångsrikstrategi för att minska luftföroreningarna. Frågan är om utsläppshandelskulle kunna vara ett effektivt sätt för att minskasjöfartens utsläpp i Europa eller Östersjöregionen?

  • 280.
    Anderberg, Stefan
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Wilewska Bien, Magda
    Sjöfart och marin teknik/maritim miljö och energisystem, Chalmers tekniska högskola, Göteborg.
    Billigare avfallshantering i hamnarna har inte gett förväntad effekt2017Inngår i: Åtgärder för att minska sjöfartens påverkan på havsmiljön / [ed] Tina Johansen Lilja, Frida Lundberg och Eva-Lotta Sundblad, Göteborg: Havsmiljöinstitutet , 2017, s. 26-27Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [sv]

    Hamnarna kan spela en viktig roll för att minska sjöfartensutsläpp i havet. Reglerna för fartygens avfallsdumpning harskärpts och i Östersjöområdet har det länge funnits en överenskommelseom att fartygen ska kunna lämna sitt avfall ihamn utan extra avgift. I praktiken låter dock de stora förbättringarnavänta på sig.

  • 281.
    Anderberg, Stefan
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Wilewska-Bien, Magda
    Sjöfart och marin teknik/maritim miljö och energisystem, Chalmers tekniska högskola, Göteborg.
    Expanderande kryssningsbransch ställer krav på Östersjöns hamnar2017Inngår i: Åtgärder för att minska sjöfartens påverkan på havsmiljön / [ed] Tina Johansen Lilja, Frida Lundberg och Eva-Lotta Sundblad, Göteborg: Havsmiljöinstitutet , 2017, s. 24-25Kapittel i bok, del av antologi (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Kryssningssjöfarten ger växande inkomster för kuststäderna,men innebär också ökad påverkan på miljön i Östersjön och dess hamnar. Trots att branschen åtagit sig att sluta släppa utavloppsvatten till sjöss lämnar bara var tredje kryssningsfartygsitt avfallsvatten vid hamnbesök. Dessutom är delar av fartygsflottani stort behov av förbättrad miljöprestanda.

  • 282.
    Andersen, Lisa
    et al.
    Linköpings universitet, Matematiska institutionen, Matematik och tillämpad matematik. Linköpings universitet, Tekniska fakulteten.
    Tebring, Sandra
    Linköpings universitet, Matematiska institutionen, Matematik och tillämpad matematik. Linköpings universitet, Tekniska fakulteten.
    Metakognitiva förmågors påverkan på elevers prestationer i matematisk problemlösning2018Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Problemlösning är en central matematisk förmåga och anses av många vara matematikens kärna. I ett försök att finna svar på hur den optimala undervisningen i problemlösning borde bedrivas, uppkom idén att studera elevers prestationer inom problemlösning kopplat till metakognition. Metakognition kan beskrivas som tänkande över det egna tänkandet och är en nödvändig förmåga i flera olika sammanhang. Denna litteraturstudie har till syfte att undersöka om metakognitiv förmåga påverkar elevers prestationer i matematisk problemlösning.Studien utgår från åtta artiklar som hittades via databasen UniSearch och det är dessa åtta artiklar som utgör resultatet. Artiklarnas metoder skiljer sig från varandra då vissa jämför elevers metakognitiva förmåga med deras prestationer inom problemlösning, medan andra testar effekten av olika undervisningsmetoder baserade på metakognition. Trots detta visar studiens resultat på att det finns ett samband mellan god metakognitiv förmåga och att prestera väl inom matematisk problemlösning. Utifrån detta dras slutsatsen att det är av stor vikt att elever får undervisning i metakognition, speciellt de svaga eleverna.

  • 283.
    Andersen, Pia
    et al.
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för samhällsmedicin. Linköpings universitet, Tekniska fakulteten. Reg Kronoberg, Sweden.
    Lendahls, Lena
    Reg Kronoberg, Sweden; Linnaeus Univ, Sweden.
    Holmberg, Sara
    Reg Kronoberg, Sweden; Lund Univ, Sweden.
    Nilsen, Per
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för samhällsmedicin. Linköpings universitet, Medicinska fakulteten.
    Patients experiences of physical activity on prescription with access to counsellors in routine care: a qualitative study in Sweden2019Inngår i: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 19, artikkel-id 210Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    BackgroundPhysical activity on prescription (PAP) has been implemented in several countries, including Sweden, to support patients who might benefit from increased physical activity. This study explores the experiences of recipients of PAP in routine health care in Sweden that offers the recipients support from physical activity counsellors. The aim was to explore influences on engagement in physical activity by PAP recipients from a long-term perspective.MethodsWe conducted individual semi-structured interviews using a topic guide with a purposively selected sample of 13 adult PAP recipients 1.5 to 2.5years after PAP. Interviews were recorded, transcribed verbatim and analysed through inductive and deductive content analysis. The questions were informed by Capability-Opportunity-Motivation-Behaviour (COM-B), which was also used as a framework to analyse the data by means of categorizing the factors (influences on the behaviour).ResultsTen factors (i.e. sub-categories) that influenced the participants engagement in physical activity were identified. PAP recipients capability to engage in physical activity was associated with adapting the PAP to the individuals physical capacity and taking into account the individuals previous experiences of physical activity. PAP recipients opportunity to engage in physical activity was related to receiving a prescription, receiving professional counselling and follow-up from a physical activity counsellor, collaboration between prescriber and counsellor, having access to appropriate activities, having a balanced life situation and having support from someone who encouraged continued physical activity. PAP recipients motivation to engage in physical activity was associated with the desire to improve his or her health condition and finding activities that encouraged continuation.ConclusionsPAP recipients engagement in physical activity was influenced by their capability, opportunity and motivation to undertake this behaviour. Numerous extraneous factors influence capability and motivation. Physical activity counsellors were found to be important for sustained activity because they use an individual approach to counselling and flexible follow-up adapted to each individuals need of support.

  • 284.
    Andersson, Anders
    Linköpings universitet, Institutionen för datavetenskap. Linköpings universitet, Tekniska fakulteten. Statens väg- och transportforskningsinstitut (VTI), Trafik och trafikant,TRAF, Fordonsteknik och simulering, FTS, Linköping, Sweden.
    Distributed Moving Base Driving Simulators: Technology, Performance, and Requirements2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Development of new functionality and smart systems for different types of vehicles is accelerating with the advent of new emerging technologies such as connected and autonomous vehicles. To ensure that these new systems and functions work as intended, flexible and credible evaluation tools are necessary. One example of this type of tool is a driving simulator, which can be used for testing new and existing vehicle concepts and driver support systems. When a driver in a driving simulator operates it in the same way as they would in actual traffic, you get a realistic evaluation of what you want to investigate. Two advantages of a driving simulator are (1.) that you can repeat the same situation several times over a short period of time, and (2.) you can study driver reactions during dangerous situations that could result in serious injuries if they occurred in the real world. An important component of a driving simulator is the vehicle model, i.e., the model that describes how the vehicle reacts to its surroundings and driver inputs. To increase the simulator realism or the computational performance, it is possible to divide the vehicle model into subsystems that run on different computers that are connected in a network. A subsystem can also be replaced with hardware using so-called hardware-in-the-loop simulation, and can then be connected to the rest of the vehicle model using a specified interface. The technique of dividing a model into smaller subsystems running on separate nodes that communicate through a network is called distributed simulation.

    This thesis investigates if and how a distributed simulator design might facilitate the maintenance and new development required for a driving simulator to be able to keep up with the increasing pace of vehicle development. For this purpose, three different distributed simulator solutions have been designed, built, and analyzed with the aim of constructing distributed simulators, including external hardware, where the simulation achieves the same degree of realism as with a traditional driving simulator. One of these simulator solutions has been used to create a parameterized powertrain model that can be configured to represent any of a number of different vehicles. Furthermore, the driver's driving task is combined with the powertrain model to monitor deviations. After the powertrain model was created, subsystems from a simulator solution and the powertrain model have been transferred to a Modelica environment. The goal is to create a framework for requirement testing that guarantees sufficient realism, also for a distributed driving simulation.

    The results show that the distributed simulators we have developed work well overall with satisfactory performance. It is important to manage the vehicle model and how it is connected to a distributed system. In the distributed driveline simulator setup, the network delays were so small that they could be ignored, i.e., they did not affect the driving experience. However, if one gradually increases the delays, a driver in the distributed simulator will change his/her behavior. The impact of communication latency on a distributed simulator also depends on the simulator application, where different usages of the simulator, i.e., different simulator studies, will have different demands. We believe that many simulator studies could be performed using a distributed setup. One issue is how modifications to the system affect the vehicle model and the desired behavior. This leads to the need for methodology for managing model requirements. In order to detect model deviations in the simulator environment, a monitoring aid has been implemented to help notify test managers when a model behaves strangely or is driven outside of its validated region. Since the availability of distributed laboratory equipment can be limited, the possibility of using Modelica (which is an equation-based and object-oriented programming language) for simulating subsystems is also examined. Implementation of the model in Modelica has also been extended with requirements management, and in this work a framework is proposed for automatically evaluating the model in a tool.

    Delarbeid
    1. Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    Åpne denne publikasjonen i ny fane eller vindu >>Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    2013 (engelsk)Inngår i: SAE International Journal of Passenger Cars - Electronic and Electrical Systems, ISSN 1946-4614, E-ISSN 1946-4622, Vol. 6, nr 1, s. 169-179Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    To evaluate driver perception of a vehicle powertrain a moving base simulator is a well-established technique. We are connecting the moving base simulator Sim III, at the Swedish National Road and Transport Research Institute with a newly built chassis dynamometer at Vehicular Systems, Linköping University. The purpose of the effort is to enhance fidelity of moving base simulators by letting drivers experience an actual powertrain. At the same time technicians are given a new tool for evaluating powertrain solutions in a controlled environment. As a first step the vehicle model from the chassis dynamometer system has been implemented in Sim III. Interfacing software was developed and an optical fiber covering the physical distance of 500 m between the facilities is used to connect the systems. Further, a pedal robot has been developed that uses two linear actuators pressing the accelerator and brake pedals. The pedal robot uses feedback loops on accelerator position or brake cylinder pressure and is controlled via an UDP interface. Results from running the complete setup showed expected functionality and we are successful in performing a driving mission based on real road topography data. Vehicle acceleration and general driving feel was perceived as realistic by the test subjects while braking still needs improvements. The pedal robot construction enables use of a large set of cars available on the market and except for mounting the brake pressure sensor the time to switch vehicle is approximately 30 minutes.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-92215 (URN)10.4271/2013-01-0410 (DOI)
    Tilgjengelig fra: 2013-05-08 Laget: 2013-05-08 Sist oppdatert: 2019-04-28bibliografisk kontrollert
    2. A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Åpne denne publikasjonen i ny fane eller vindu >>A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Vise andre…
    2015 (engelsk)Inngår i: Proceedings of the DSC 2015 Europe: Driving Simulation Conference & Exhibition / [ed] Heinrich Bülthoff, Andras Kemeny and Paolo Pretto, 2015, s. 123-130Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    Modern vehicles are complex systems consisting of an increasing large multitude of components that operate together. While functional verification on individual components is important, it is also important to test components within a driving environment, both from a functional perspective and from a driver perspective. One proven way for testing is vehicle simulators and in this work the main goals have been to increase flexibility and scalability by introducing a distributed driving simulator platform.

    As an example, consider a workflow where a developer can go from a desktop simulation to an intermediate driving simulator to a high fidelity driving simulator with Hardware-In-the-Loop systems close to a finished vehicle in an easy way. To accomplish this, a distributed simulation architecture was designed and implemented that divides a driving simulator environment into four major entities with well-defined interfaces, using HLA as the method of communication. This platform was evaluated on two aspects, flexibility/scalability and timing performance. Results show that increased flexibility and scalability was achieved when using a distributed simulation platform. It is also shown that latency was only slightly increased when using HLA.

    Emneord
    Test, Vehicle, Engine, Performance, Simulator (driving), Computer
    HSV kategori
    Forskningsprogram
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 90 Road: Vehicles and vehicle technology, 96 Road: Vehicle operating and management
    Identifikatorer
    urn:nbn:se:liu:diva-136153 (URN)9783981309935 (ISBN)
    Konferanse
    Driving Simulation Conference 2015. 16-18 september 2015, Tübingen, Germany
    Tilgjengelig fra: 2016-01-11 Laget: 2017-03-31 Sist oppdatert: 2019-04-28bibliografisk kontrollert
    3. Testing cooperative intelligent transport systems in distributed simulators
    Åpne denne publikasjonen i ny fane eller vindu >>Testing cooperative intelligent transport systems in distributed simulators
    Vise andre…
    2019 (engelsk)Inngår i: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 65, s. 206-216Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Simulation is often used as a technique to test and evaluate systems, as it provides a cost-efficient and safe alternative for testing and evaluation. A combination of simulators can be used to create high-fidelity and realistic test scenarios, especially when the systems-under-test are complex. An example of such complex systems is Cooperative Intelligent Transport Systems (C-ITS), which include many actors that are connected to each other via wireless communication in order to interact and cooperate. The majority of the actors in the systems are vehicles equipped with wireless communication modules, which can range from fully autonomous vehicles to manually driven vehicles. In order to test and evaluate C-ITS, this paper presents a distributed simulation framework that consists of (a) a moving base driving simulator; (b) a real-time vehicle simulator; and (c) network and traffic simulators. We present our approach for connecting and co-simulating the simulators. We report on limitation and performance that this simulation framework can achieve. Lastly, we discuss potential benefits and feasibility of using the simulation framework for testing of C-ITS.

    sted, utgiver, år, opplag, sider
    Elsevier, 2019
    Emneord
    Cooperative intelligent transportation systems, Hardware-in-the-loop, Network simulator, Traffic simulator, Moving base driving simulator
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-159824 (URN)10.1016/j.trf.2019.07.020 (DOI)
    Tilgjengelig fra: 2019-08-22 Laget: 2019-08-22 Sist oppdatert: 2019-08-22bibliografisk kontrollert
    4. Parameterization procedure of a powertrain model for a driving simulator
    Åpne denne publikasjonen i ny fane eller vindu >>Parameterization procedure of a powertrain model for a driving simulator
    2016 (engelsk)Inngår i: Advances in Transportation Studies, ISSN 1824-5463, Vol. 1, s. 99-112Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    The automotive industry is facing a major challenge to reduce environmental impacts. As a consequence, the increasing diversity of powertrain configurations put a demand on testing and evaluation procedures. One of the key tools for this purpose is simulators. In this paper a powertrain model and a procedure for parameterizing it, using chassis dynamometers and a developed pedal robot are presented. The parameterizing procedure uses the on-board diagnostics of the car and does not require any additional invasive sensors.

    Thus, the developed powertrain model and parameterization procedure provide a rapid non- invasive way of modelling powertrains of test cars. The parameterizing procedure has been used to model a front wheel drive Golf V with a 1.4L multi-fuel engine and a manual gearbox. The achieved results show a good match between simulation results and test data. The powertrain model has also been tested in real-time in a driving simulator.

    sted, utgiver, år, opplag, sider
    Aracne editrice, 2016
    Emneord
    Motor, Test, Characteristics, Simulation
    HSV kategori
    Forskningsprogram
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
    Identifikatorer
    urn:nbn:se:liu:diva-156538 (URN)10.4399/978885489179109 (DOI)2-s2.0-84982994768 (Scopus ID)
    Tilgjengelig fra: 2019-04-26 Laget: 2019-04-26 Sist oppdatert: 2019-05-03bibliografisk kontrollert
    5. Vehicle model quality framework for moving base driving simulators, a powertrain model example
    Åpne denne publikasjonen i ny fane eller vindu >>Vehicle model quality framework for moving base driving simulators, a powertrain model example
    2018 (engelsk)Inngår i: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, E-ISSN 1745-6444, Vol. 13, nr 2, s. 93-108Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Moving base driving simulators, with an enclosed human driver, are often used to study driver-vehicle interaction or driver behaviour. Reliable results from such a driving simulator study strongly depend on the perceived realism by the driver in the performed driving task. Assuring sufficient fidelity for a vehicle dynamics model during a driving task is currently to a large degree a manual task. Focus here is to automate this process by employing a framework using collected driving data for detection of model quality for different driving tasks. Using this framework, a powertrain model credibility is predicted and assessed. Results show that chosen powertrain model is accurate enough for a driving scenario on rural roads/motorway, but need improvements for city driving. This was expected, considering the complexity of the vehicle dynamics model, and it was accurately captured by the proposed framework which includes real-time information to the simulator operator.

    sted, utgiver, år, opplag, sider
    InderScience Publishers, 2018
    Emneord
    vehicle dynamics model, driving simulator, driving task, quality framework, domain of validity, domain of operation, powertrain model
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-156544 (URN)10.1504/IJVSMT.2018.098330 (DOI)2-s2.0-85063100727 (Scopus ID)
    Tilgjengelig fra: 2019-04-26 Laget: 2019-04-26 Sist oppdatert: 2019-05-03bibliografisk kontrollert
    6. Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    Åpne denne publikasjonen i ny fane eller vindu >>Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    2013 (engelsk)Inngår i: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, s. 131-139Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

    sted, utgiver, år, opplag, sider
    Linköping: Linköping University Electronic Press, 2013
    Serie
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 84
    Emneord
    Modelica; real-time; distributed; communications link
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-118994 (URN)978-91-7519-621-3 (ISBN)978-91-7519-617-6 (ISBN)
    Konferanse
    The 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools, April 19, University of Nottingham, Nottingham; UK
    Tilgjengelig fra: 2015-06-05 Laget: 2015-06-05 Sist oppdatert: 2019-04-28bibliografisk kontrollert
    7. Powertrain Model Assessment for Different Driving Tasks through Requirement Verification
    Åpne denne publikasjonen i ny fane eller vindu >>Powertrain Model Assessment for Different Driving Tasks through Requirement Verification
    2018 (engelsk)Inngår i: The 9th EUROSIM Congress on Modelica and Simulation, 2018, s. 721-727Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    For assessing whether a system model is a good candidate for a particular simulation scenario or choosing the best system model between multiple design alternatives it is important to be able to evaluate the suitability of the system model. In this paper we present a methodology based on finite state machine requirements verifying system behaviour in a Modelica environment where the intended system model usage is within a moving base driving simulator. A use case illustrate the methodology with a Modelica powertrain system model using replaceable components and measured data from a Golf V. The achieved results show the importance of context of requirements and how users are assisted in finding system model issues. 

    Serie
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 142
    Emneord
    system model assessment, requirement modelling, Modelica, finite state machine, powertrain validations
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-156540 (URN)10.3384/ecp17142721 (DOI)978-91-7685-399-3 (ISBN)
    Konferanse
    EUROSIM 2016
    Tilgjengelig fra: 2019-04-26 Laget: 2019-04-26 Sist oppdatert: 2019-05-13
  • 285.
    Andersson, Anders
    Linköpings universitet, Institutionen för datavetenskap. Linköpings universitet, Tekniska fakulteten. Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden.
    Extensions for Distributed Moving Base Driving Simulators2017Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Modern vehicles are complex systems. Different design stages for such a complex system include evaluation using models and submodels, hardware-in-the-loop systems and complete vehicles. Once a vehicle is delivered to the market evaluation continues by the public. One kind of tool that can be used during many stages of a vehicle lifecycle is driving simulators.

    The use of driving simulators with a human driver is commonly focused on driver behavior. In a high fidelity moving base driving simulator it is possible to provide realistic and repetitive driving situations using distinctive features such as: physical modelling of driven vehicle, a moving base, a physical cabin interface and an audio and visual representation of the driving environment. A desired but difficult goal to achieve using a moving base driving simulator is to have behavioral validity. In other words, \A driver in a moving base driving simulator should have the same driving behavior as he or she would have during the same driving task in a real vehicle.".

    In this thesis the focus is on high fidelity moving base driving simulators. The main target is to improve the behavior validity or to maintain behavior validity while adding complexity to the simulator. One main assumption in this thesis is that systems closer to the final product provide better accuracy and are perceived better if properly integrated. Thus, the approach in this thesis is to try to ease incorporation of such systems using combinations of the methods hardware-in-the-loop and distributed simulation. Hardware-in-the-loop is a method where hardware is interfaced into a software controlled environment/simulation. Distributed simulation is a method where parts of a simulation at physically different locations are connected together. For some simulator laboratories distributed simulation is the only feasible option since some hardware cannot be moved in an easy way.

    Results presented in this thesis show that a complete vehicle or hardware-in-the-loop test laboratory can successfully be connected to a moving base driving simulator. Further, it is demonstrated that using a framework for distributed simulation eases communication and integration due to standardized interfaces. One identified potential problem is complexity in interface wrappers when integrating hardware-in-the-loop in a distributed simulation framework. From this aspect, it is important to consider the model design and the intersections between software and hardware models. Another important issue discussed is the increased delay in overhead time when using a framework for distributed simulation.

    Delarbeid
    1. Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    Åpne denne publikasjonen i ny fane eller vindu >>Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    2013 (engelsk)Inngår i: SAE International Journal of Passenger Cars - Electronic and Electrical Systems, ISSN 1946-4614, E-ISSN 1946-4622, Vol. 6, nr 1, s. 169-179Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    To evaluate driver perception of a vehicle powertrain a moving base simulator is a well-established technique. We are connecting the moving base simulator Sim III, at the Swedish National Road and Transport Research Institute with a newly built chassis dynamometer at Vehicular Systems, Linköping University. The purpose of the effort is to enhance fidelity of moving base simulators by letting drivers experience an actual powertrain. At the same time technicians are given a new tool for evaluating powertrain solutions in a controlled environment. As a first step the vehicle model from the chassis dynamometer system has been implemented in Sim III. Interfacing software was developed and an optical fiber covering the physical distance of 500 m between the facilities is used to connect the systems. Further, a pedal robot has been developed that uses two linear actuators pressing the accelerator and brake pedals. The pedal robot uses feedback loops on accelerator position or brake cylinder pressure and is controlled via an UDP interface. Results from running the complete setup showed expected functionality and we are successful in performing a driving mission based on real road topography data. Vehicle acceleration and general driving feel was perceived as realistic by the test subjects while braking still needs improvements. The pedal robot construction enables use of a large set of cars available on the market and except for mounting the brake pressure sensor the time to switch vehicle is approximately 30 minutes.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-92215 (URN)10.4271/2013-01-0410 (DOI)
    Tilgjengelig fra: 2013-05-08 Laget: 2013-05-08 Sist oppdatert: 2019-04-28bibliografisk kontrollert
    2. Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    Åpne denne publikasjonen i ny fane eller vindu >>Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    2013 (engelsk)Inngår i: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, s. 131-139Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

    sted, utgiver, år, opplag, sider
    Linköping: Linköping University Electronic Press, 2013
    Serie
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 84
    Emneord
    Modelica; real-time; distributed; communications link
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-118994 (URN)978-91-7519-621-3 (ISBN)978-91-7519-617-6 (ISBN)
    Konferanse
    The 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools, April 19, University of Nottingham, Nottingham; UK
    Tilgjengelig fra: 2015-06-05 Laget: 2015-06-05 Sist oppdatert: 2019-04-28bibliografisk kontrollert
    3. A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Åpne denne publikasjonen i ny fane eller vindu >>A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Vise andre…
    2015 (engelsk)Inngår i: Proceedings of the DSC 2015 Europe: Driving Simulation Conference & Exhibition / [ed] Heinrich Bülthoff, Andras Kemeny and Paolo Pretto, 2015, s. 123-130Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    Modern vehicles are complex systems consisting of an increasing large multitude of components that operate together. While functional verification on individual components is important, it is also important to test components within a driving environment, both from a functional perspective and from a driver perspective. One proven way for testing is vehicle simulators and in this work the main goals have been to increase flexibility and scalability by introducing a distributed driving simulator platform.

    As an example, consider a workflow where a developer can go from a desktop simulation to an intermediate driving simulator to a high fidelity driving simulator with Hardware-In-the-Loop systems close to a finished vehicle in an easy way. To accomplish this, a distributed simulation architecture was designed and implemented that divides a driving simulator environment into four major entities with well-defined interfaces, using HLA as the method of communication. This platform was evaluated on two aspects, flexibility/scalability and timing performance. Results show that increased flexibility and scalability was achieved when using a distributed simulation platform. It is also shown that latency was only slightly increased when using HLA.

    Emneord
    Test, Vehicle, Engine, Performance, Simulator (driving), Computer
    HSV kategori
    Forskningsprogram
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 90 Road: Vehicles and vehicle technology, 96 Road: Vehicle operating and management
    Identifikatorer
    urn:nbn:se:liu:diva-136153 (URN)9783981309935 (ISBN)
    Konferanse
    Driving Simulation Conference 2015. 16-18 september 2015, Tübingen, Germany
    Tilgjengelig fra: 2016-01-11 Laget: 2017-03-31 Sist oppdatert: 2019-04-28bibliografisk kontrollert
  • 286.
    Andersson, Anders
    et al.
    Swedish National Road and Transport Research Institute, Sweden.
    Buffoni, Lena
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Powertrain Model Assessment for Different Driving Tasks through Requirement Verification2018Inngår i: The 9th EUROSIM Congress on Modelica and Simulation, 2018, s. 721-727Konferansepaper (Fagfellevurdert)
    Abstract [en]

    For assessing whether a system model is a good candidate for a particular simulation scenario or choosing the best system model between multiple design alternatives it is important to be able to evaluate the suitability of the system model. In this paper we present a methodology based on finite state machine requirements verifying system behaviour in a Modelica environment where the intended system model usage is within a moving base driving simulator. A use case illustrate the methodology with a Modelica powertrain system model using replaceable components and measured data from a Golf V. The achieved results show the importance of context of requirements and how users are assisted in finding system model issues. 

  • 287.
    Andersson, Anders
    et al.
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten. Swedish National Road and Transportation Research Institute.
    Fritzson, Peter
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup2013Inngår i: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, s. 131-139Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

  • 288. Andersson, Carina
    et al.
    Losand, Elin
    Bergman Ärlebäck, Jonas
    Linköpings universitet, Matematiska institutionen, Matematik och tillämpad matematik. Linköpings universitet, Tekniska fakulteten.
    Att uppleva räta linjer och grafer – erfarenheter från ett forskningsprojekt2015Inngår i: Nämnaren 2014:4, nr 1, s. 21-27Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 289.
    Andersson, Conny
    Linköpings universitet, Institutionen för systemteknik, Fordonssystem. Linköpings universitet, Tekniska fakulteten.
    Design of the Modelica Library VehProLib with Non-ideal Gas Models in Engines2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis covers the reconstruction and the redesign of the modeling library VehProLib,which is constructed in the modeling language Modelica with help of the modeling toolWolfram SystemModeler. The design choices are discussed and implemented. This thesisalso includes the implementation of a turbocharger package and an initial study of the justificationof the ideal gas law in vehicle modeling. The study is made with help of Van derWaals equation of states as a reference of non-ideal gas model. It will be shown that for themean-value-engine-model, the usage of ideal gas law is justified.

  • 290.
    Andersson, Elias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Arfwidsson, Oskar
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Bergstrand, Victor
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Thollander, Patrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    A study of the comparability of energy audit program evaluations2017Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 142, s. 2133-2139Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is a large untapped potential for improved energy efficiency in various sectors of the economy. Governmental industrial energy audit programs subsidizing the companies to conduct an energy audit are the most common policy in trying to overcome the energy efficiency gap. Evaluation studies have been carried out to gain knowledge about the success of a completed energy audit policy program. The evaluations were made in different ways and in addition focused on different performance indicators and used different ways of categorizing data. In this article, a literature review has been made of five evaluation studies from different energy audit programs, where the problems of the present incomparability between programs due to differences are discussed. The policy implication of this paper is that new energy audit policy programs must distinguish a harmonized way of categorizing data, both regarding energy efficiency measures and energy end-use. Further, a proposition for a standard for how to evaluate energy audit policy programs is suggested. Conclusions from this study are that important elements, such as the free-rider effect and harmonized energy end-use data, should be defined and included in evaluation studies. A harmonized standard for evaluating audit programs is not least needed within the EU, where member states are obliged to launch audit programs for large enterprises, and preferably also for small and medium-sized enterprises. This paper serves as an important contribution for the development of such a standard in further research. (C) 2016 Elsevier Ltd. All rights reserved.

  • 291.
    Andersson, Elias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Arfwidsson, Oskar
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Thollander, Patrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Benchmarking energy performance of industrial small and medium-sized enterprises using an energy efficiency index: Results based on an energy audit policy program2018Inngår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 182, s. 883-895Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Improved energy efficiency among industrial companies is recognized as a key effort to reduce emissions of greenhouse gases. In this context, benchmarking industrial energy efficiency plays an important part in increasing industrial companies awareness of their energy efficiency potential. A method for calculating an energy efficiency index is proposed in this paper. The energy efficiency index is used to benchmark the energy performance of industrial small and medium-sized companies support and production processes. This enables the possibility to compare the energy performance of single energy end-use processes. This papers proposed energy efficiency index is applied to energy data from 11 sawmills that participated in the Swedish national energy audit program. The index values were compared with each sawmills energy saving potential, as stated in the energy audits. One conclusion is that the energy efficiency index is suitable as an energy strategy tool in industrial energy management and could be used both by industrial SMEs and by governmental agencies with an auditing role. However, it does require a harmonized categorization of energy end-use processes as well as quality assured energy data. Given this, a national energy end-use database could be created to facilitate the calculation of an energy efficiency index. (C) 2018 Elsevier Ltd. All rights reserved.

    Fulltekst tilgjengelig fra 2020-02-10 14:54
  • 292.
    Andersson, Elias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Karlsson, Magnus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Thollander, Patrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Paramonova, Svetlana
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Energy end-use and efficiency potentials among Swedish industrial small and medium-sized enterprises - A dataset analysis from the national energy audit program2018Inngår i: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 93, s. 165-177Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Improving energy efficiency in industry is recognized as one of the most vital activities for the mitigation of climate change. Consequently, policy initiatives from governments addressing both energy-intensive and small and medium-sized industry have been enacted. In this paper, the energy end-use and the energy efficiency potential among industrial small and medium-sized companies participating in the Swedish Energy Audit Program are reviewed. The three manufacturing industries of wood and cork, food products and metal products (excluding machinery and equipment) are studied. A unique categorization of their production processes energy end-use is presented, the results of which show that the amount of energy used in various categories of production processes differ between these industries. This applies to support processes as well, highlighting the problem of generalizing results without available bottom-up energy end-use data. In addition, a calculation of conservation supply curves for measures related to production processes is presented, showing that there still remains energy saving potential among companies participating in the Swedish Energy Audit Program. However, relevant data in the database used from the Swedish Energy Audit Program is lacking which limits the conclusions that can be drawn from the conservation supply curves. This study highlights the need to develop energy policy programs delivering high-quality data. This paper contributes to a further understanding of the intricate matters of industrial energy end-use and energy efficiency measures.

  • 293.
    Andersson, Elias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Thollander, Patrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Energisystem. Linköpings universitet, Tekniska fakulteten.
    Key performance indicators for energy management in the Swedish pulp and paper industry2019Inngår i: Energy Strategy Reviews, ISSN 2211-467X, E-ISSN 2211-4688, Vol. 24, s. 229-235Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The pulp and paper industry is one of the five most energy-intensive industries world-wide. In Sweden, most pulp and paper mills were certified with a standardized energy management system already in 2005. As Swedish mills have more than a decade of experience with energy management systems and energy key performance indicators (KPIs), studying KPIs within Swedish pulp and paper mills will enable both a state-of-the-art positioning of best-practice in relation to energy KPIs in pulp and paper mills, but also spot potential barriers and drivers in the utilization of energy KPIs. This paper studies the current level of implementation and operationalization of energy-related KPIs in the Swedish pulp and paper industry. The results show a potential for improvement.

  • 294.
    Andersson, Erik
    Linköpings universitet, Institutionen för systemteknik, Fordonssystem. Linköpings universitet, Tekniska fakulteten.
    Modelling of Cranking Behaviour in Heavy Duty Truck Engines2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In modern heavy duty trucks the battery is a central component. Its traditional role as an energy source for engine cranking has been extended to include powering a number of elec- trical components on the truck, both during driving and during standstill. As a consequence of this it is important to know how much a battery in use has aged and lost in terms of ca- pacity and power output. The difficulty in measuring these factors on a battery in use causes problem, since heavy duty truck batteries are often replaced too early or too late, leading to unnecessary high replacement costs or truck standstill respectively.

    The overall goal of the effort, of which this thesis is a part, is to use a model of the cranking behaviour of a heavy duty truck engine, which depends on the battery condition, to estimate the ageing and wear of a heavy duty truck battery. This thesis proposes a modelling approach to model the components involved in engine cranking.

    In the thesis work, system identification is made of the systems forming part of the cranking of a heavy duty truck engine. These components are the starter battery, the starter motor and its electrical circuit and the internal combustion engine. Measurement data has been provided by Scania AB for the evaluation of the models. The data has been collected from crankings of a heavy duty diesel engine at different temperatures and battery charge levels. For every cranking lapse the battery voltage and current have been measured as well as the engine rotational speed.

    A starter battery model is developed and evaluated. The resulting battery model is then incorporated into two different engine cranking models, Model 1 and Model 2, including a starter motor model and an internal combustion engine model apart form the battery model. The two cranking models differ in several aspects and their differences and resulting evalu- ations are discussed.

    The battery model is concluded to be sufficiently accurate during model verification, however the two cranking models are not. Model 2 is verified as more correct in in its output than Model 1, but neither is sufficiently accurate for their purpose. The conclusion is drawn that the modelling approach is sound but development of Model 2 is needed before the model can be used in model-based condition estimation. 

  • 295.
    Andersson, Fredrik
    Linköpings universitet, Institutionen för datavetenskap, Databas och informationsteknik. Linköpings universitet, Tekniska fakulteten.
    Storing and structuring big data with businessintelligence in mind2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Sectra has a customer database with approximately 1600 customers across the world. In this system there exists not only medical information but alsoinformation about the environment which the system runs in, usage  pattern and much more.

    This report is about storing data received from log les into a suitable database. Sectra wants to be able to analyze this information so that they can make strategic decisions and get a better understanding of their customers' needs. The tested databases are MongoDB, Cassandra, and MySQL. The results shows that MySQL  is not suitable for storing large amount of data with the current conguration. On the other hand, both MongoDB and Cassandra performed well with the growing amount of data.

  • 296.
    Andersson Granberg, Tobias
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Axelsson, Peter
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Petersson, Jonas
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Polishchuk, Tatiana
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Polishchuk, Valentin
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Schmidt, Christiane
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Configuration and Planning of the Remote TowerModules in a Remote Tower Center2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Today, many small aerodromes struggle withfinancial difficulties, and a large cost is air traffic control.Remote tower centers, which remotely provide air traffic servicesto aerodromes, can help reduce this cost. Each center maycontain a number of remote tower modules, where each moduleis manned by a controller that can handle one or moreaerodromes. In this paper we present the remote tower centerconcept and develop a model that optimizes the assignment ofairports to the remote tower modules. Computational results fora possible scenario based on real data for Swedish airports arepresented.

  • 297.
    Andersson Granberg, Tobias
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Danielsson, Niklas
    Geotelix AB.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Nordström, Johan
    Räddningstjänsten Östra Götaland.
    Pilemalm, Sofie
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Informatik. Linköpings universitet, Filosofiska fakulteten.
    Tjernström, Richard
    Norrköping Municipality.
    Yousefi Mojir, Kayvan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Informatik. Linköpings universitet, Filosofiska fakulteten.
    Using Semi-professionals in Emergency Response2016Inngår i: Proceedings of the 13th International Conference on Information Systems for Crisis Response and Management / [ed] Andrea H. Tapia, Pedro Antunes, Victor A. Bañuls, Kathleen Moore and João Porto de Albuquerque, 2016Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The term semi-professional can be used to denote occupational groups that do not have emergency response as their primary profession but who get additional responsibilities within rescue and response, e.g. by performing a first response or assisting the professional emergency services. In this study, four different groups of possible semi-professional resources are analyzed and compared. Similarities and differences between the four groups are discussed. Factors, important for the successful implementation of a cross-sector collaboration of this kind, are highlighted. The preliminary results show that all four groups have the potential to act as semi-professional resources within emergency response. Interestingly, the basic requirements are the same for all groups, despite different prerequisites.

  • 298.
    Andersson Granberg, Tobias
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Pilemalm, Sofie
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Informatik. Linköpings universitet, Filosofiska fakulteten.
    Yousefi Mojir, Kayvan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Informatik. Linköpings universitet, Filosofiska fakulteten.
    Effektivt sambruk av kommunala resurser för ökad säkerhet och trygghet2017Rapport (Annet vitenskapelig)
    Abstract [sv]

    Användandet av så kallade semiprofessionella resurser i räddningsinsatser har blivit allt vanligare i Sverige. En semiprofessionell är en person som fått utökade arbetsuppgifter inom respons och räddning inom ramen för sitt ordinarie yrke. Det kanske mest kända exemplet är väktare som responderar på den kommunala räddningstjänstens ärenden.

    I det projekt som avrapporteras här, är syftet att undersöka vilka yrkesgrupper som skulle passa bra som semiprofessionella, och vad som krävs för att de effektivt ska kunna utföra de nya arbetsuppgifterna, bland annat i form av utbildning och utrustning. Vidare syftar projektet till att utvärdera vilken samhällsnytta semiprofessionella kan bidra med. Som studieobjekt används Norrköpings kommun, och via en aktionsforskningsinspirerad metodansats är målet att projektresultaten ska kunna bidra till en ökad säkerhet och trygghet i kommunen.

    En kombination av kvalitativa och kvantitativa metoder används för att uppnå syftet. Genom workshops identifieras först fyra potentiella yrkesgrupper (räddningstjänstens dagtidspersonal, hemtjänstpersonal, förvaltningsentreprenörer och väktare), för vilka detaljerad data erhålls via fokusgruppsintervjuer. En grupp (räddningstjänstens dagtidspersonal) väljs ut för vidare analys, och ytterligare en workshop genomförs, plus ett experiment i form av en simulerad olycka där semiprofessionella får göra en första insats. En prototyp av ett utlarmningssystem tas fram, inklusive en smartphoneapplikation som de semiprofessionella kan använda för att ta emot och hantera larm. Med hjälp av applikationen utförs ett experiment där historiska larm skickas till potentiella semiprofessionella under två månaders tid, och de får svara på om de kan åka eller inte, samtidigt som deras position noteras. Genom att jämföra deltagarnas uppskattade insatstider med räddningstjänstens historiska, kan möjliga insatstidsförkortningar beräknas. Detta kompletteras med en bedömning av vad de kan bidra med i respektive händelse.

    Bedömningen görs enligt en strukturerad metod av professionell personal från två olika räddningstjänstorganisationer. De beräknade insatstiderna och den skattade förmågan vägs samman till en monetär nytta av den semiprofessionella insatsen.

    Resultatet visar att det finns ett stort antal yrkesgrupper som skulle kunna vara lämpliga att nyttja som semiprofessionella. I rapporten redovisas en lista med 23 grupper som anses ha potential och möjlighet att utföra räddningsinsatser som en del av sitt yrke. Vidare redovisas ett antal utmaningar och möjligheter, baserat på analysen av de fyra utvalda grupperna. En konkret sammanställning har gjorts i form av listor på utbildning och utrustning som krävs för att de effektivt kunna utföra sitt nya uppdrag. Dessa krav är förhållandevis enkla att uppfylla, och handlar om grundläggande utbildning i riskbedömning, brandsläckning och livräddande åtgärder, samt utrustning som tex handbrandsläckare och förbandslåda. Mer utmanande är de organisatoriska förändringar som är nödvändiga för att de semiprofessionella akut ska kunna lämna sina pågående arbetsuppgifter, samt hur utlarmningen ska kunna integreras i de tekniska system som används för professionella räddningsresurser. Vidare visar resultaten att semiprofessionella kan larmas, och förväntas göra nytta på en stor mängd olika typer av händelser, dock främst vid händelser med personskador eller akuta sjukdomsförlopp. Den monetära nyttan av att införa ett fåtal (i snitt 3,4 st) semiprofessionella i Norrköping och Linköpings kommuner beräknades till mellan 600 000 och 2 400 000 kr per år, beroende på hur lång tid det tar för de semiprofessionella ifrån att de får larm tills de påbörjar färden mot händelseplatsen.

    En slutsats från projektet är att semiprofessionella skulle bidra till en ökad säkerhet och trygghet i Norrköping kommun, om de används som förstainsatsresurser, som ett komplement till befintlig professionell räddningspersonal.

  • 299.
    Andersson Granberg, Tobias
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. CARER.
    Granlund, Rego
    SICS East Swedish ICT AB, Sweden.
    Lindborg, Jonas
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
    Ulander, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. CARER.
    Dynamisk planering av räddningstjänst2014Rapport (Annet vitenskapelig)
    Abstract [sv]

    Dynamisk planering innebär bland annat att brandmännen delar in sig i mindre grupper än traditionellt. Dessa kan då arbeta förebyggande med utbildning eller placeras strategiskt till exempel i närheten av olycksdrabbade vägsträckor, för att snabbare kunna nå fram till en olycksplats. Då en olycka inträffar larmas de brandmän som snabbast kan nå fram, och det kan vara nödvändigt att larma flera olika grupper.

    En utmaning vid dynamisk planering är att planeringssituationen blir svårare. Det är inte längre självklart vilka brandmän som ska larmas till en viss olycka. Det kan också vara svårt att hitta de bästa placeringarna för brandmän som snabbt ska kunna göra en insats.

    I projektet har vi utvecklat och utvärderat datorbaserade verktyg som kan stödja dynamisk planering av räddningstjänst.

    Bland verktygen finns en beredskapskalkylator med tillhörande visualisering, vilken beräknar beredskapen som en funktion av tiden det tar för de nödvändiga resurserna att nå fram till en viss typ av olycka och sannolikheten för att olyckan ska inträffa i närområdet. Ett annat verktyg kan ge förslag på vilka resurser som bör skickas till en olycksplats för att de ska komma fram så fort som möjligt. Ett tredje verktyg kan ge förslag på hur fordon och personal dynamiskt bör placeras för att beredskapen ska förbättras, dvs. de ska kunna nå fram så fort som möjligt till de platser där det är störst sannolikhet att en olycka kommer att inträffa.

    Verktygen har utvärderats genom två experimentserier. I experimenten testades mänskligt beslutsfattande i en simulerad räddningstjänstmiljö. I den första serien fick personal från olika räddningstjänster prova på dynamisk planering utan hjälp av de datorbaserade verktygen. I den andra serien fick andra räddningstjänster köra samma scenarier, men då ta hjälp av de i projektet utvecklade verktygen.

    Resultaten visar att verktygen kan hjälpa räddningstjänsten med planeringen av beredskapen, men också att det finns risk att detta sker på bekostnad av att planeringen tar något längre tid. En tydlig majoritet av de deltagande räddningstjänstbefälen var positivt inställda till de utvecklade verktygen och tyckte verktyg av detta slag skulle kunna hjälpa dem i det dagliga arbetet.

    Resultaten tydliggör också att olika personer – till och med nära kollegor inom samma räddningstjänst – uppfattar begreppet beredskap på olika sätt. Det visade sig dock att beredskapsvisualiseringen kan bidra till att denna skillnad i uppfattning minskar; i den andra experimentserien, där de hade tillgång till detta verktyg, minskade variationerna i bedömningarna och deltagarnas uppfattningar stämde bättre överens med den beräknade beredskapen.

  • 300.
    Andersson Granberg, Tobias
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Lundberg, Jonas
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
    Ulander, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Rego, Granlund
    SICS Swedish ICT, Linkoping, Sweden.
    Supporting dispatch decisions for the fire and rescue services2015Inngår i: 2015 IEEE 18th International Conference on Intelligent Transportation Systems, IEEE conference proceedings, 2015, s. 2562-2567Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Decision support tools for efficient dispatching of fire and rescue resources are developed and evaluated. The tools can give suggestions about which resources to dispatch to new accidents, and help the decision makers in evaluating the current preparedness for handling future accidents. The tools are evaluated using simulation game based experiments, with players from the fire and rescue services. The results indicate that the tools can help the fire and rescue services in identifying the closest resources to new accidents, and to select resources that preserve the preparedness in the area. However, the results also indicate that there is a risk that the tools increase the decision time. 

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