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  • Sintorn, Johan
    Linköping University, Department of Management and Engineering, Machine Design.
    Sintorn, Johan
    Linköping University, Department of Management and Engineering, Machine Design.
    Enclosing and Mounting an Electronic Component on Articulated Haulers: A proposition on how to protect, and where to place, an intelligent node on the environmentally harsh exterior of construction equipment with respect to multiple parameters2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As is the case with many other manufacturers of vehicles, Volvo Construction Equipment has a constantly increasing amount of electric and electronic equipment in their articulated haulers. These are of great use in modern machines, bringing functions, and safety that were not possible before, but they also bring more cables to handle.

    In the case of the articulated haulers a quite thick cable harness of about 15 meters in length reaches from the driver’s cabin in the front to the components in the far back end of the vehicle. This is not only a lot of long cables to handle both during assembly and service, but the nature of signals traveling in cables is that the voltage gets weaker with distance. This phenomenon has to be accounted for by measuring devices dependent on the voltage.

    It has been suggested that a device referred to as an intelligent node, or ICCS-module, which communicates digitally via CAN could be installed in the back of the articulated haulers. This module would be independent of the mentioned drop in voltage. The ICCS-module will be receiving a small bundle of cables being routed from the driver’s cabin. From it cables would go out to a majority of the components in its vicinity. The components connected to the node would not need to have any other cables.

    This thesis is focused on the mechanical aspects of installing this ICCS-module. Having electric and electronic equipment on construction vehicles is a challenge when it comes to protecting the device from the harsh environment that is the hauler’s exterior. It will have to withstand being immersed in water for long periods of time, greatly varying temperatures, vibrations and shocks as well as being hit by projectiles. The placement as well as the design of the enclosure should be chosen with respect to both the devices length of life and how well it fulfils its intended role and achieves the expected results.

    To produce an enclosure and find a placement aiming to satisfy these conditions, a traditional product development process were executed. The articulated haulers as well as relevant literature were researched. Concepts were generated and evaluated by both the author and by employees at Volvo Construction Equipment until a final concept for the enclosure and placement were found. The enclosure were then designed in detail specifying the material, manufacturing techniques, controlled for thermodynamic circumstances, modelled in Catia V5 and controlled for vibrations. It was concluded that the enclosure should be able protect the ICCS-module after some more development and that the placement and cable routing results in a much shorter total cable length.

  • Lundin, Linda
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Lundin, Linda
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Hypotetiska utvecklingsbanor i matematik: En litteraturstudie om hur forskning om hypotetiska utvecklingsbanor kan vara ett redskap i lärares planering och undervisning2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med litteraturstudien var att undersöka hur matematiklärare kan använda forskningsresultat om hypotetiska utvecklingsbanor som ett redskap i sin planering och undervisning. Hypotetiska utvecklingsbanor är ett begrepp som beskriver en möjlig utveckling av elevers konceptuella förståelse i matematik genom ett antal aktiviteter eller uppgifter. Resultatet från studien är att forskningsresultat utifrån hypotetiska utvecklingsbanor kan vägleda lärares planering och undervisning i matematik på flera sätt. Lärare kan använda forskning om hypotetiska utvecklingsbanor för att se vilka svårigheter elever kan ha inom det matematiska området och som en hjälp för att använda formativ bedömning i sin undervisning. Forskningsresultat om hypotetiska utvecklingsbanor kan hjälpa lärare att översätta mål och innehåll i läroplanen till aktiviteter och lektionsinnehåll och knyta samman olika begrepp och delar av det matematiska innehållet.

  • Hoff, Matilda
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Hoff, Matilda
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Samarbete i ett inkluderande matematikklassrum: En kvalitativ fallstudie om samarbetet mellan speciallärare och ämneslärare i matematik2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats är en kvalitativ fallstudie om samarbetet mellan ämneslärare i årskurs 7-9 och speciallärare i matematik i ett inkluderande klassrum. Syftet med denna uppsats är att undersöka hur lärarna kan utforma sitt samarbete för att gynna elever i behov av särskilt stöd i det inkluderande klassrummet. Fallstudien genomfördes i form av en semistrukturerad intervju med en fokusgrupp. Fokusgruppen bestod av en speciallärare och en ämneslärare i matematik som samarbetade med inkluderande stödundervisning. Intervjudatan analyserades genom en tematisk analys. Resultatet visar att lärarna behövde ha en gemensam utgångspunkt och samma målsättning för att gynna eleverna. Vidare visade resultatet att lärarna samarbetade genom att de arbetade på en jämlik nivå, var flexibla och varierade undervisningen. Oavsett undervisningssätt behövde lärarna skolledningens stöd för att inkluderingsarbetet skulle bli framgångsrikt.

  • Evestedt, Niclas
    et al.
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Evestedt, Niclas
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Ljungqvist, Oskar
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Axehill, Daniel
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Motion planning for a reversing general 2-trailer configuration using Closed-Loop RRT2016In: 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Institute of Electrical and Electronics Engineers (IEEE), 2016, 3690-3697 p.Conference paper (Refereed)
    Abstract [en]

    Reversing with a dolly steered trailer configura- tion is a hard task for any driver without extensive training. In this work we present a motion planning and control framework that can be used to automatically plan and execute complicated manoeuvres. The unstable dynamics of the reversing general 2- trailer configuration with off-axle hitching is first stabilised by an LQ-controller and then a pure pursuit path tracker is used on a higher level giving a cascaded controller that can track piecewise linear reference paths. This controller together with a kinematic model of the trailer configuration is then used for forward simulations within a Closed-Loop Rapidly Exploring Random Tree framework to generate motion plans that are not only kinematically feasible but also include the limitations of the controller’s tracking performance when reversing. The approach is evaluated over a series of Monte Carlo simulations on three different scenarios and impressive success rates are achieved. Finally the approach is successfully tested on a small scale test platform where the motion plan is calculated and then sent to the platform for execution. 

  • Evestedt, Niclas
    et al.
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Evestedt, Niclas
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Ward, Erik
    KTH, Royal Institute of Technology in Stockholm, Sweden.
    Folkesson, John
    KTH, Royal Institute of Technology in Stockholm, Sweden.
    Axehill, Daniel
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Interaction aware trajectory planning for merge scenarios in congested traffic situations2016In: 2016 IEEE 19th International Conference on Intelligent Transportation Systems (ITSC), Institute of Electrical and Electronics Engineers (IEEE), 2016, 465-472 p.Conference paper (Refereed)
    Abstract [en]

    In many traffic situations there are times where interaction with other drivers is necessary and unavoidable in order to safely progress towards an intended destination. This is especially true for merge manoeuvres into dense traffic, where drivers sometimes must be somewhat aggressive and show the intention of merging in order to interact with the other driver and make the driver open the gap needed to execute the manoeuvre safely. Many motion planning frameworks for autonomous vehicles adopt a reactive approach where simple models of other traffic participants are used and therefore need to adhere to large margins in order to behave safely. However, the large margins needed can sometimes get the system stuck in congested traffic where time gaps between vehicles are too small. In other situations, such as a highway merge, it can be significantly more dangerous to stop on the entrance ramp if the gaps are found to be too small than to make a slightly more aggressive manoeuvre and let the driver behind open the gap needed. To remedy this problem, this work uses the Intelligent Driver Model (IDM) to explicitly model the interaction of other drivers and evaluates the risk by their required deceleration in a similar manner as the Minimum Overall Breaking Induced by Lane change (MOBIL) model that has been used in large scale traffic simulations before. This allows the algorithm to evaluate the effect on other drivers depending on our own trajectory plans by simulating the nearby traffic situation. Finding a globally optimal solution is often intractable in these situations so instead a large set of candidate trajectories are generated that are evaluated against the traffic scene by forward simulations of other traffic participants. By discretization and using an efficient trajectory generator together with efficient modelling of the traffic scene real-time demands can be met.

  • Brengesjö, Sara
    Linköping University, Department of Behavioural Sciences and Learning.
    Brengesjö, Sara
    Linköping University, Department of Behavioural Sciences and Learning.
    När elever med autismspektrumtillstånd möter NO i skolan: Lärares uppfattningar av pedagogiska strategier som underlättar förståelse2016Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsens syfte är att beskriva och förklara hinder, möjligheter och framgångsrika pedagogiska strategier som, enligt lärare, kan finnas i lärandesituationen då elever med autismspektrumtillstånd, AST möter naturorienterat ämnesinnehåll, NO. Sex intervjuer gjordes med lärare med erfarenhet av att undervisa elever med AST i NO. Intervjuerna analyserades tematiskt, där fem teman blev resultatet: ”upplevelse av meningsfullhet”, ”omgivning som stödjer upplevelse av kontroll”, ”hantera teori”, ”hantera laborationer” och ”hantera social kommunikation”. Dessa teman analyserades utifrån kognitiva teorier i förhållande till AST och Vygotskys lärandeteorier. 

    Resultatet bidrar till kunskapen om pedagogiska strategier som kan minska hinder och utnyttja möjligheter då elever med AST möter NO i skolan. Det pekar på värdet av att använda elevernas intresse och erfarenheter för att nå meningsfullhet i lärandet. Sammanhangsförklarande, överenskommelser och delmål kan vara till hjälp då eleverna inte ser meningen. En omgivning som stödjer upplevelse av kontroll är en annan viktig förutsättning för lärande, vilket kan skapas med hjälp av visuell struktur, avstämningar och begränsning av sinnesintryck. Faktakaraktären på NO- ämnena kan passa elever med AST, men de abstrakta begreppen kan upplevas hindrande. Artefakter som konkretiserar och sammanhangsförklarar kan då vara användbara. Laborationsmomenten kan vara intresseväckande och lämpligt strukturerade, men också kognitivt och praktiskt svårhanterliga. Genom att göra situationen mindre komplex och tydliggöra kan eleven stödjas och lärande i den proximala utvecklingszonen bli möjligt. Den sociala kommunikationen kan utgöra en utmaning som kan kräva särskilda åtgärder för att fungera, som att pedagogen tar ansvar för att bygga trygga relationer och bemöter eleven med respektfull tydlighet. 

  • Tesanovic, Manuela
    Linköping University, Department of Computer and Information Science.
    Tesanovic, Manuela
    Linköping University, Department of Computer and Information Science.
    Prestanda och funktionalitetstest av Raspberry Pi2016Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [sv]

    Användare ställer hela tiden högre krav på att webbläsare ska vara snabba och tillgängliga oavsett på vilken plattform de används på. Detta gäller även för testbäddens projekt där Raspberry Pi testades för framtida användning som en tunn klient. Arbetet är en fallstudie som undersöker prestanda och funktionaliteten hos Raspberry Pi 2 för organisationen Region Östergötland, Testbädden. Valet av testverktyg och avgränsningar i varje steg är grundade på funktionaliteten som är en del av ISO 9126 standard. Arbetet undersöker webbläsare som kan användas på OS Raspbian Wheezy samt Ubuntu mate. Genom en förundersökning av webbläsare utfördes avgränsningar med hjälp av webstandardtesterna Acid3 och HTML5. Av 33 möjliga webbläsare återstod fem som uppfyllde kraven för vidare undersökning. De kvarstående webbläsare genomgick benchmarktester och därefter togs en genomsnittlig sidladdningstid för varje webbläsare samt CPU och RAM användning i realtid. Resultatet visade att endast två av fem webbläsare klarade benchmarktesterna och utav dessa två var det webbläsaren Epiphany som presterade bäst utifrån sidladdningstid, CPU och minnesanvändning. Raspberry Pi överklockades för att undersöka om samma resultat skulle fås i denna studie som i en tidigare vetenskaplig studie. Resultatet visade att sidladdningstiden minskade men att CPU och RAM användningen ökade. Alla testverktyg genererade olika resultat och ett verktyg eller siffra räcker inte till att undersöka prestandan och funktionaliteten. Valet av den mest kompatibla webbläsaren för Raspberry Pi beror på användaren och vad den ska användas till.

  • Bertilsson, Erik
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Bertilsson, Erik
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    A Scalable Architecture for Massive MIMO Base Stations Using Distributed Processing2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Massive MIMO is an emerging technology for future wireless systems that has received much attention from both academia and industry recently. The most prominent feature of Massive MIMO is that the base station is equiped with a large number of antennas. It is therefore important to create scalable architectures to enable simple deployment in different configurations.

    In this thesis, a distributed architecture for performing the baseband processing in a massive OFDM MU-MIMO system is proposed and analyzed. The proposed architecture is based on connecting several identical nodes in a K-ary tree. It is shown that, depending on the chosen algorithms, all or most computations can be performed in a distrbuted manner. Also, the computational load of each node does not depend on the number of nodes in the tree (except for some timing issues) which implies simple scalability of the system.

    It is shown that it should be enough that each node contains one or two complex multipliers and a few complex adders running at a couple of hundres MHz to support specifications similar to LTE. Additionally the nodes must communicate with each other over links with data rates in the order of some Gbps.

    Finally, a VHDL implementation of the system is proposed. The implementation is parameterized such that a system can be generated from a given specification.

  • Bhide, Priyanka
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Bhide, Priyanka
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Design and Evaluation of Aceelerometer Based Mobile Authentication Techniques2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Smartphones’ usages are growing rapidly. Smart phone usages are not limited to the receiving/calling or SMSing anymore. People use smartphone for online shopping, searching various information in the web, bank transactions, games, different applications for different usages etc. Anything is possible by just having a smartphone and the internet. The more usages of the smartphone also increase keeping more secrete information about the user in the phone. The popularity is increasing and so is different ways to steal/hack the phones. There are many areas which require further investigation in the field of smartphone security and authentication.

    This thesis work evaluates the scope of different inbuilt sensors in smartphones for mobile authentication based techniques. The Android Operating system was used in the implementation phase. Android OS has many open source library and Services which have been used for the sensor identification using Java Android platform.

    Two applications using Accelerometer sensor and one using Magnetometer sensor were developed. Two foremost objectives of this thesis work were-1) To figure it out the possibilities of sensor based authentication technique. 2) To check the end user perception/opinion about the applications.

    Usability testing was conducted to gather the user’s assessments/vision of the applications. Two methods which were used for usability testing are named Magical move and Tapping. Users (Most of them) have shown interest and inclination towards tapping application. Although, some users were also expressed inhibitions using both sensor based methods.

  • Public defence: 2017-02-10 09:00 Hugo Theorell, Linköping
    Rejmstad, Peter
    Linköping University, Department of Biomedical Engineering, Biomedical Instrumentation. Linköping University, Faculty of Science & Engineering.
    Rejmstad, Peter
    Linköping University, Department of Biomedical Engineering, Biomedical Instrumentation. Linköping University, Faculty of Science & Engineering.
    Optical Monitoring of Cerebral Microcirculation2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The cerebral microcirculation consists of a complex network of small blood vessels that support nerve cells with oxygen and nutrition. The blood flow and oxygen delivery in the microcirculatory blood vessels are regulated through mechanisms which may be influenced or impaired by disease or brain damage resulting from conditions such as brain tumors, traumatic brain injury or subarachnoid hemorrhage (SAH). Monitoring of parameters relating to the microvascular circulation is therefore needed in the clinical setting. Optical techniques such as diffuse reflectance spectroscopy (DRS) and laser Doppler flowmetry (LDF) are capable of estimating the oxygen saturation (SO2) and tracking the microvascular blood flow (perfusion) using a fiber optic probe. This thesis presents the work carried out to adapt DRS and LDF for monitoring cerebral microcirculation in the human brain.

    A method for real-time estimation of SO2 in brain tissue was developed based on the P3 approximation of diffuse light transport and quadratic polynomial fit to the measured DRS signal. A custom-made fiberoptic probe was constructed for measurements during tumor surgery and in neurointensive care. Software modules with specific user interface for LDF and DRS were programmed to process, record and present parameters such as perfusion, total backscattered light, heart rate, pulsatility index, blood fraction and SO2 from acquired signals.

    The systems were evaluated on skin, and experimentally by using optical phantoms with properties mimicking brain tissue. The oxygen pressure (pO2) in the phantoms was regulated to track spectroscopic changes coupled with the level of SO2. Clinical evaluation was performed during intraoperative measurements during tumor surgery (n = 10) and stereotactic deep brain stimulation implantations (n = 20). The LDF and DRS systems were also successfully assessed in the neurointensive care unit for a patient treated for SAH. The cerebral autoregulation was studied by relating the parameters from the optical systems to signals from the standard monitoring equipment in neurointensive care.

    In summary, the presented work takes DRS and LDF one step further toward clinical use for optical monitoring of cerebral microcirculation.

    List of papers
    1. A laser Doppler system for monitoring of intracerebral microcirculation
    Open this publication in new window or tab >>A laser Doppler system for monitoring of intracerebral microcirculation
    2012 (English)In: Conf Proc IEEE Eng Med Biol Soc., ISSN 1557-170X, 1988-1991 p.Article in journal (Refereed) Published
    Abstract [en]

    A two-channel standard laser Doppler perfusion monitor has been adapted for intracerebral measurements. Software developed in Labview makes it possible to present the microvascular perfusion, total light intensity (TLI), heart rate and trend curves in real-time during surgery. A custom-made optical probe was designed in order to enable easy fixation during brain surgery. The constructed brain probe was evaluated and compared to a standard probe. Both probes presented similar feasibility when used for the skin recordings. In addition, evaluation was done in one patient in relation to tumor resection. Stable perfusion and TLI signals were immediately recorded when the probe was positioned in cerebral tissue. Movement artifacts were clearly seen when the probe was moved to a new site. Recordings in cortex and tumor border showed higher perfusion and lower TLI compared to measurements in subcortical white matter. The calculated heart rate estimate agreed well with the noted value from the electrocardiographic patient monitoring system.                                                                                                                                                      

    Place, publisher, year, edition, pages
    IEEE, 2012
    National Category
    Medical Engineering
    Identifiers
    urn:nbn:se:liu:diva-86150 (URN)10.1109/EMBC.2012.6346346 (DOI)000313296502058 ()23366307 (PubMedID)978-1-4244-4119-8 (ISBN)e-978-1-4244-4120-4 (ISBN)978-1-4577-1787-1 (ISBN)
    Funder
    Swedish Research Council
    Available from: 2012-12-07 Created: 2012-12-07 Last updated: 2017-01-11Bibliographically approved
    2. A laser Doppler system for monitoring of cerebral microcirculation: implementation and evaluation during neurosurgery
    Open this publication in new window or tab >>A laser Doppler system for monitoring of cerebral microcirculation: implementation and evaluation during neurosurgery
    2016 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, ISSN 0140-0118, Vol. 54, no 1, 123-131 p.Article in journal (Refereed) Published
    Abstract [en]

    The aim of this study was to adapt and evaluate laser Doppler perfusion monitoring (LDPM) together with custom designed brain probes and software for continuous recording of cerebral microcirculation in patients undergoing neurosurgery. The LDPM system was used to record perfusion and backscattered light (TLI). These parameters were displayed together with the extracted heart rate (HR), pulsatility index (PI) and signal trends from adjustable time intervals. Technical evaluation was done on skin during thermal provocation. Clinical measurements were performed on ten patients undergoing brain tumour surgery. Data from 76 tissue sites were captured with a length varying between 10 s to 15 min. Statistical comparisons were done using Mann-Whitney tests. Grey and tumour tissue could be separated from white matter using the TLI-signal (p < 0.05). The perfusion was significantly higher in grey and tumour tissue compared to white matter (p < 0.005). LDPM was successfully used as an intraoperative tool for monitoring local blood flow and additional parameters linked to cerebral microcirculation (perfusion, TLI, heart rate and PI) during tumour resection. The systems stability opens up for studies in the postoperative care of patients with e.g. traumatic brain injury or subarachnoid haemorrhage.

    Place, publisher, year, edition, pages
    Springer Berlin/Heidelberg, 2016
    Keyword
    Microcirculation, Brain tumour Laser Doppler perfusion monitoring (LDPM), Pulsatility index (PI), Neurosurgery
    National Category
    Medical Laboratory and Measurements Technologies
    Identifiers
    urn:nbn:se:liu:diva-120632 (URN)10.1007/s11517-015-1332-5 (DOI)000371437900010 ()26105147 (PubMedID)
    Funder
    Swedish Research Council, 6212-010-4216
    Available from: 2015-08-20 Created: 2015-08-20 Last updated: 2017-01-11
    3. A method for monitoring of oxygen saturation changes in brain tissue using diffuse reflectance spectroscopy
    Open this publication in new window or tab >>A method for monitoring of oxygen saturation changes in brain tissue using diffuse reflectance spectroscopy
    2016 (English)In: Journal of Biophotonics, ISSN 1864-063X, E-ISSN 1864-0648Article in journal (Refereed) Epub ahead of print
    Abstract [en]

    Continuous measurement of local brain oxygen saturation (SO2) can be used to monitor the status of brain trauma patients in the neurocritical care unit. Currently, micro-oxygen-electrodes are considered as the “gold standard” in measuring cerebral oxygen pressure (pO2), which is closely related to SO2 through the oxygen dissociation curve (ODC) of hemoglobin, but with the drawback of slow in response time. The present study suggests estimation of SO2 in brain tissue using diffuse reflectance spectroscopy (DRS) for finding an analytical relation between measured spectra and the SO2 for different blood concentrations. The P3 diffusion approximation is used to generate a set of spectra simulating brain tissue for various levels of blood concentrations in order to estimate SO2. The algorithm is evaluated on optical phantoms mimicking white brain matter (blood volume of 0.5–2%) where pO2 and temperature is controlled and on clinical data collected during brain surgery. The suggested method is capable of estimating the blood fraction and oxygen saturation changes from the spectroscopic signal and the hemoglobin absorption profile.

    Place, publisher, year, edition, pages
    Wiley-VCH Verlagsgesellschaft, 2016
    Keyword
    oxygenation, diffuse reflectance spectroscopy, hemoglobin, optical phantom, human brain
    National Category
    Other Medical Engineering
    Identifiers
    urn:nbn:se:liu:diva-127362 (URN)10.1002/jbio.201500334 (DOI)27094015 (PubMedID)
    Available from: 2016-04-22 Created: 2016-04-22 Last updated: 2017-01-11Bibliographically approved
  • Holmquist, Karl
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, Faculty of Science & Engineering.
    Holmquist, Karl
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, Faculty of Science & Engineering.
    SLAMIt A Sub-Map Based SLAM System: On-line creation of multi-leveled map2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In many situations after a big catastrophe such as the one in Fukushima, the disaster area is highly dangerous for humans to enter. It is in such environments that a semi-autonomous robot could limit the risks to humans by exploring and mapping the area on its own. This thesis intends to design and implement a software based SLAM system which has potential to run in real-time using a Kinect 2 sensor as input.

    The focus of the thesis has been to create a system which allows for efficient storage and representation of the map, in order to be able to explore large environments. This is done by separating the map in different abstraction levels corresponding to local maps connected by a global map.

    During the implementation, this structure has been kept in mind in order to allow modularity. This makes it possible for each sub-component in the system to be exchanged if needed.

    The thesis is broad in the sense that it uses techniques from distinct areas to solve the sub-problems that exist. Some examples being, object detection and classification, point-cloud registration and efficient 3D-based occupancy trees.

  • Public defence: 2017-02-17 13:00 Temcas, hus T, Linköping
    Söderström, Sara
    Linköping University, Department of Thematic Studies.
    Söderström, Sara
    Linköping University, Department of Thematic Studies.
    Regional Environmental Governance and Avenues for the Ecosystem Approach to management in the Baltic Sea Area2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis explores the avenues for the ecosystem approach to management in theBaltic Sea Region. This region is one of the most contaminated water bodies inthe world, although the first Regional Seas Convention was created here and theregion has a long history of cooperation and environmental protection. Thecurrent environmental governance arrangements are examined with specific focuson governance structures, cross-sectoral integration and ecological boundaries.The ecosystem approach to management as both a tool and vision of holisticmanagement of natural resources is traced through the evolution of environmentalgovernance, as well as its manifestation in contemporary environmental policiesin the region. It is found that the major EU directives, as well as HELCOMpolices, promote the ecosystem approach and that its presence has increased inrecent years; it is now the major guiding principle in European marinegovernance. However, the governance structures impede implementation indifferent ways. The environmental problem areas in the region all require differentgovernance arrangements, thus obstructing a holistic approach. The environmentalproblems per se also affect each other, necessitating far-reaching sectoralintegration and cross-border cooperation, which at present is the major obstacleregarding implementation. The contemporary trends combining solidregionalisation through HELCOM with increased Europeanisation and macroregionalisationby different EU initiatives offer some promise, but the crosssectoralimpediments must be resolved if the ecosystem approach is to become apractical approach and not just a policy principle.

    List of papers
    1. 'Environmental governance' and 'ecosystem management': avenues for synergies between two approaches
    Open this publication in new window or tab >>'Environmental governance' and 'ecosystem management': avenues for synergies between two approaches
    2016 (English)In: Interdisciplinary Environmental Review, ISSN 1521-0227, E-ISSN 2042-6992, Vol. 17, no 1, 1-19 p.Article in journal (Refereed) Published
    Abstract [en]

    Based on a literature review of over 160 journal articles and books, this article examines the ecosystem management and environmental governance approaches, and looks for common topics and integrated research agendas. While scientific articles on environmental governance stem primarily from social science research, the ecosystem management approach is more natural science-oriented. A review of journal articles from the ISI Web of Knowledge (Web of Science) reveals that the two research communities hardly interact. The paper discusses two thematic linkages between the two approaches: the debates dealing with the scale and level of environmental policy; and the discussions surrounding multi-stakeholder participation. Moreover, the article identifies areas with a high potential for the establishment of common ground, such as the current discussion on science-policy interfaces. We argue for more interaction, claim that the two research approaches can learn from each other, and discuss the potential for the development of interdisciplinary research agendas.

    Place, publisher, year, edition, pages
    Bucks: InderScience Publishers, 2016
    Keyword
    environmental governance; ecosystem management; environmental policy scale; environmental policy level; multi-stakeholder participation; science-policy interfaces; multiple stakeholders; literature review; interdisciplinary research.
    National Category
    Social Sciences Interdisciplinary Environmental Management Human Aspects of ICT Information Systems, Social aspects
    Identifiers
    urn:nbn:se:liu:diva-133973 (URN)10.1504/IER.2016.074871 (DOI)
    Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2017-01-17Bibliographically approved
    2. Marine Governance in the Baltic Sea: Current Trends of Europeanization and Regionalization
    Open this publication in new window or tab >>Marine Governance in the Baltic Sea: Current Trends of Europeanization and Regionalization
    2015 (English)In: Governing Europe's Marine Environment: Europeanization of Regional Seas or Regionalization of EU Policies? / [ed] Michael Gilek and Kristine Kern, Farnham: Ashgate, 2015, 163-181 p.Chapter in book (Other academic)
    Place, publisher, year, edition, pages
    Farnham: Ashgate, 2015
    Keyword
    Miljövetenskapliga studier; Östersjö- och Östeuropaforskning
    National Category
    Environmental Sciences
    Identifiers
    urn:nbn:se:liu:diva-133975 (URN)9781409447276 (ISBN)
    Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2017-01-17Bibliographically approved
  • Belousov, Dennis
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Belousov, Dennis
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Development of a Vehicle Simulation Model Consisting of Low and High Frequency Dynamics2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As vehicle testing on existing vehicles is both time and resource consuming, the work of testing safety algorithms on vehicle is desired to be made more efficient. Therefore the goal of this thesis is to study and develop a vehicle simulation model that can simulate desired dynamics of existing and non-existing vehicles.

    The developed model consist of two areas of application: slow dynamics and vibrational dynamics. These areas are developed and validated using different methods, but as a part of the simulator, they are to be simulated together.

    For the slow, low frequency, vehicle motion, a three state transient motion model is derived and examined. The possibility of parametrisation is studied and performed using prediction error minimisation.

    For the vibration, high frequency model, a combination of a linear quarter car model with wheel motion is used to estimate road vibration characteristics. The modelled road is used to simulate the vehicle behaviour. The suggested methods regarding the vibration modelling and road estimation are performed using power spectral density as the road is not known determinately. Wheel speeds are used to study the power spectral densities as they are available at high sampling frequencies.

    The available tools and sensors used during this thesis are limited to existing vehicle sensors and GPS signals. The effect of this limitation is studied and the results are discussed.

  • Public defence: 2017-02-10 10:15 ACAS, A-huset, Linköping
    Eslami, Mohammad H.
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering.
    Eslami, Mohammad H.
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering.
    Knowledge integration with customers in collaborative product developmentproject2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Driven by rapid technological developments, greater customer expectations, and increased product complexity,product development processes increasingly rely on the integration of dispersed specialist knowledge.Consequently, many industrial firms are changing the way they approach product development. Productdevelopment increasingly relies on knowledge integration across firm boundaries. Customers are one of the mostindispensable sources of knowledge, and their knowledge needs to be integrated during product development.However, little is known about the processes and mechanisms used to integrate customer knowledge in productdevelopment.Therefore, firms must devise processes and mechanisms that support knowledge integration withcustomers. This thesis aims to investigate knowledge integration with customers in collaborative productdevelopment.

    The work described in this thesis combines a case study with a survey approach. More specifically, five casestudies were conducted at three industrial manufacturing firms. Data were collected in 46 interviews, along withinformal discussions, workshops, and secondary material. The case studies revealed the role of knowledgeintegration, knowledge integration mechanisms, and the importance of contextual factors related to the customer’stechnical capability, and the locus of initiative for the product development project. A cross-sectional survey wasperformed in order to ascertain the role of knowledge integration and its effect on innovation performance and theeffect of firms and customers’ technical capability and locus of initiative on knowledge integration withcustomers. The survey study generated 216 responses from firms operating in the Swedish manufacturingindustry.

    This thesis consists of a compiled summary and five appended papers. The results in these provide the basis formodelling knowledge integration with customers. The findings confirm that integrating knowledge withcustomers in product development is associated with better innovation performance. Further, the results point tothe dynamic characteristics of knowledge integration in product development processes. More specifically, firmstend to apply different combinations of mechanisms in different phases, depending on the intended content of theknowledge contribution of the customer and the requirements of each phase in the development process. Inaddition, the degree of technical capability, internal integration capability, and locus of initiative are importantfactors influencing knowledge integration processes. This thesis sheds new light on collaborative productdevelopment with customers by demonstrating that knowledge, and particularly the integration of knowledgeacross firm boundaries, is a central property of product development. The study focuses on industrial andmanufacturing firms, complementing current perspectives on the role of customers in other sectors. In thisparticular sector, complexity and system-wide implications need to be resolved together with customers throughknowledge integration activities. An important implication of the thesis is that firms need to devise mechanismsfor knowledge integration with customers, and be prepared to redevise these as the firm progresses through theproduct development phases.

    List of papers
    1. Knowledge integration with customers in collaborative product development projects
    Open this publication in new window or tab >>Knowledge integration with customers in collaborative product development projects
    2016 (English)In: The journal of business & industrial marketing, ISSN 0885-8624, E-ISSN 2052-1189, Vol. 31, no 7, 889-900 p.Article in journal (Refereed) Published
    Abstract [en]

    Purpose This paper addresses the need for managerial and organizational approaches to knowledge integration with customer in collaborative product development projects. The purpose is to identify the roles of customers in terms of the customerᅵs knowledge contribution and timing of customer collaboration in the product development process. Design/methodology/approach This study is based on a multi-case study approach, comprising four product development projects from two large international suppliers. The cases were selected following the theoretical replication logic. Data consist of interviews, workshops, and secondary information. For each of the cases, a within case analysis was performed followed by a cross-case analysis. Findings The study shows that the customerᅵs knowledge contribution is aligned with the specific requirements of each phase of the product development. Three specific customer roles are identified and connected to the customerᅵs knowledge contribution and the timing of customer collaboration. The technical capability of the customer and the locus of initiative of the product development project are affecting the prerequisites for knowledge integration with customers. Research limitations/implications The study is performed from the perspective of supplier firms. We have not been able to capture the perspective of the customer in detail. As it is expected that both customers and suppliers benefit from a systematic knowledge exchange, future studies could examine knowledge contributions in both directions. Practical implications The findings can be used to devise effective approaches for collaborative product development with customers related to the customerᅵs knowledge contribution and the timing of customer collaboration and provide guidance to firms seeking to benefit from knowledge residing at customers. Originality/value This is one of the first studies to focus on the integration of customersᅵ knowledge in product development processes. This paper contributes to the customerᅵsupplier collaboration literature by presenting further insight into customersᅵ knowledge contributions, the timing of customer collaboration in product development processes and the prerequisites for knowledge integration with customers.

    National Category
    Economics Economics and Business
    Identifiers
    urn:nbn:se:liu:diva-130858 (URN)10.1108/JBIM-05-2014-0099 (DOI)
    Available from: 2016-08-29 Created: 2016-08-29 Last updated: 2017-01-17Bibliographically approved
    2. Internal integration in complex collaborative product development projects
    Open this publication in new window or tab >>Internal integration in complex collaborative product development projects
    2016 (English)In: International Journal of Innovation Management, ISSN 1363-9196, E-ISSN 1757-5877, Vol. 20, 1650008Article in journal (Refereed) Accepted
    Abstract [en]

    While the importance of internal integration for effective inter-firm collaboration with suppliers is widely acknowledged, it is presently unclear how it is achieved in complex collaborative product development projects. This paper aims to address this gap in extant knowledge by investigating the internal integration approaches and exploring related project management challenges. Specifically, three internal integration approaches are found, namely integration based on multidirectional, frequent interaction; integration based on delimited, problem-solving; and based on unidirectional, information-oriented interaction. The study findings suggest that internal integration approaches are related to the degree of uncertainty in the subsystems of the suppliers, rather than the overall product system. Consequently, in complex product development projects involving many internal functions and several different suppliers, the specific supplier tasks, rather than the overall project structure and aims, determine the mode of internal integration required. This complexity creates important challenges for organisation, and requires flexibility in internal integration approaches.

    Place, publisher, year, edition, pages
    World Scientific Publishing, 2016
    Keyword
    Internal integration; supplier involvement; task uncertainty; collaborative projects; subsystem; case study
    National Category
    Business Administration
    Identifiers
    urn:nbn:se:liu:diva-114889 (URN)10.1142/S1363919616500080 (DOI)
    Note

    The previous status of this article was Manuscript.

    Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2017-01-17Bibliographically approved
  • Ceragioli, Francesca
    et al.
    Politécnico di Torino, Dip. di Mathematica.
    Ceragioli, Francesca
    Politécnico di Torino, Dip. di Mathematica.
    Lindmark, Gustav
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Clas, Veibäck
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Wahlström, Niklas
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Lindfors, Martin
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Altafini, Claudio
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    A bounded confidence model that preserves the signs of the opinions2016In: Proceedings of the 2016 European Control Conference, Institute of Electrical and Electronics Engineers (IEEE), 2016, 543-548 p.Conference paper (Refereed)
    Abstract [en]

    The aim of this paper is to suggest a modification to the usual bounded confidence model of opinion dynamics, so that “changes of opinion” (intended as changes of the sign of the initial state) of an agent are never induced by the dynamics. In order to do so, a bipartite consensus model is used, endowing it with a confidence range. The resulting signed bounded confidence model has a state-dependent connectivity and a behavior similar to its standard counterpart, but in addition it preserves the sign of the opinions by “repelling away” opinions localized near the origin but on different sides with respect to 0.

  • Jeuthe, Julius
    Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Jeuthe, Julius
    Linköping University, Department of Biomedical Engineering, Medical Informatics.
    Automatic Tissue Segmentation of Volumetric CT Data of the Pelvic Region2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Automatic segmentation of human organs allows more accurate calculation of organ doses in radiationtreatment planning, as it adds prior information about the material composition of imaged tissues. For instance, the separation of tissues into bone, adipose tissue and remaining soft tissues allows to use tabulated material compositions of those tissues. This approximation is not perfect because of variability of tissue composition among patients, but is still better than no approximation at all. Another use for automated tissue segmentationis in model based iterative reconstruction algorithms. An example of such an algorithm is DIRA, which is developed at the Medical Radiation Physics and the Center for Medical Imaging Science and Visualization(CMIV) at Linköpings University. DIRA uses dual-energy computed tomography (DECT) data to decompose patient tissues into two or three base components. So far DIRA has used the MK2014 algorithm which segments human pelvis into bones, adipose tissue, gluteus maximus muscles and the prostate. One problem was that MK2014 was limited to 2D and it was not very robust.

    Aim: The aim of this thesis work was to extend the MK2014 to 3D as well as to improve it. The task was structured to the following activities: selection of suitable segmentation algorithms, evaluation of their results and combining of those to an automated segmentation algorithm. Of special interest was image registration usingthe Morphon.

    Methods: Several different algorithms were tested.  For instance: Otsu's method followed by threshold segmentation; histogram matching followed by threshold segmentation, region growing and hole-filling; affine phase-based registration and the Morphon. The best-performing algorithms were combined into the newly developed JJ2016.

    Results: For the segmentation of adipose tissue and the bones in the eight investigated data sets, the JJ2016 algorithm gave better results than the MK2014. The better results of the JJ2016 were achieved by: (i) a new segmentation algorithm for adipose tissue which was not affected by the amount of air surrounding the patient and segmented smaller regions of adipose tissue and (ii) a new filling algorithm for connecting segments of compact bone. The JJ2016 algorithm also estimates a likely position for the prostate and the rectum by combining linear and non-linear phase-based registration for atlas based segmentation. The estimated position (center point) was in most cases close to the true position of the organs. Several deficiencies of the MK2014 algorithm were removed but the improved version (MK2014v2) did not perform as well as the JJ2016.

    Conclusions: JJ2016 performed well for all data sets. The JJ2016 algorithm is usable for the intended application, but is (without further improvements) too slow for interactive usage. Additionally, a validation of the algorithm for clinical use should be performed on a larger number of data sets, covering the variability of patients in shape and size.

  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Some estimates for the mean curvature of nonparametric surfaces defined over domains in $R^n$1994In: Journal of Mathematical Sciences, ISSN 1072-3374, E-ISSN 1573-8795, Vol. 72, no 4, 3250-3260 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Life-time of minimal tubes and coefficients of univalent functions in a circular ring1995In: Bulletin de la Société des sciences et des lettres de Lódz, ISSN 0459-6854, Vol. 20, 19-26 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Finiteness of the number of ends of minimal submanifolds in Euclidean space1994In: Manuscripta mathematica, ISSN 0025-2611, E-ISSN 1432-1785, Vol. 82, 313-330 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    A remark on the Jörgens-Calabi-Pogorelov theorem1995In: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 340, 317-318 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Some estimates for the mean curvature of graphs over domains in $R^n$1991In: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 42, no 2, 387-390 p.Article in journal (Refereed)
  • Miklyukov, Vladimir
    et al.
    Volgograd State University.
    Miklyukov, Vladimir
    Volgograd State University.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    The structure in the large of externally complete minimal surfaces in $R^3$1987In: Izvestiia vysshikh uchebnykh zavedenii. Matematika (Izvestija Vuzov. Mathematics), ISSN 0021-3446, Vol. 31, no 7, 37-35 p.Article in journal (Refereed)
    Abstract [en]

    We establish the absence of nontrivial noncompact parametric minimal surfaces in the Euclidean 3-space satisfying some additional geometrical properties.

  • Miklyukov, Vladimir
    et al.
    Volgograd State University.
    Miklyukov, Vladimir
    Volgograd State University.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Some properties of tube minimal surfaces of arbitrary codimension1989In: Sbornik. Mathematics, ISSN 1064-5616, E-ISSN 1468-4802, Vol. 180, 1278-1295 p.Article in journal (Refereed)
    Abstract [en]

    We establish the finiteness of life-time of a tubular minimal surface of an arbitrary codimension.

  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Denjoy-Ahlfors theorem for harmonic functions on Riemannian manifolds and external structure of minimal surfaces1996In: Communications in analysis and geometry, ISSN 1019-8385, E-ISSN 1944-9992, Vol. 4, no 4, 547-587 p.Article in journal (Refereed)
    Abstract [en]

    We extend the well-known Denjoy-Ahlfors theorem about the number of different asymptotic tracts of a holomorphic function to subharmonic functions on arbitrary Riemannian manifolds. We obtain some versions of the Liouville theorem for Aa-harmonic functions without the geodesic completeness requirement on a manifold. Moreover, the upper estimate of the topological index of the height function of a minimal surface in Rn has been established and, as a consequence, a new prove of the Bernstein's theorem has been derived. Other applications to the theory of minimal surfaces are also discussed.

  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    A theorem on the clearance radius for minimal surfaces1996In: Mathematical notes of the Academy of Sciences of the USSR, ISSN 0001-4346, E-ISSN 1573-8876, Vol. 59, no 5-6, 657-660 p.Article in journal (Refereed)
    Abstract [en]

    A least upper bound for the inner radius of an opening in a complete minimal hypersurface contained in a parallel layer is given. 

  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    External geometry of p-minimal surfaces1997In: Geometry from Pacific Rim / [ed] Berrick, A. Jon / Loo, Bonaventure / Wang, Hong-Yu, Walter de Gruyter, 1997, , 363–375 p.363-376 p.Conference paper (Refereed)
    Abstract [en]

    We introduce a new class of p-minimal surfaces. We shaw that the Gauss map of a two-dimensional p-minimal surface in R3 is quasiconformal . A counterpart to Bernstein's celebrated result about entire solutions of the minimal surface equation is obtained. A study of tubular p-minimal hypersurfaces is included. 

  • Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Minimal tubes of finite integral curvature1998In: Siberian mathematical journal, ISSN 0037-4466, E-ISSN 1573-9260, Vol. 39, no 1, 159-167 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    et al.
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Kuznetsova, Olga S.
    Saratov State University.
    Asymptotic properties of solutions of the Hele-Shaw equation1999In: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 367, no 2, 164-165 p.Article in journal (Refereed)
  • Tkachev, Vladimir
    et al.
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Reshetnikova, Irina
    Volgograd State University.
    On the Gauss map of embedded minimal tubes1999In: Note di Matematica, ISSN 1123-2536, E-ISSN 1590-0932, Vol. 19, no 1, 7-17 p.Article in journal (Refereed)
    Abstract [en]

    A surface is called a tube if its level-sets with respect to some coordinate function (the axis of the surface) are compact. Any tube of zero mean curvature has an invariant, the so-called flow vector. We study how the geometry of the Gaussian image of a higher-dimensional minimal tube M is controlled by the angle alpha(M) between the axis and the flow vector of M. We prove that the diameter of the Gauss image of M is at least 2alpha(M). As a consequence we derive an estimate on the length of a two-dimensional minimal tube M in terms of alpha(\M) and the total Gaussian curvature of M.

  • Tkachev, Vladimir
    et al.
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Tkachev, Vladimir
    Linköping University, Department of Mathematics, Mathematics and Applied Mathematics. Linköping University, Faculty of Science & Engineering.
    Sergienko, Vladimir
    Volgograd State University.
    Doubly periodic maximal surfaces with singularities2002In: Siberian Advances in Mathematics, ISSN 1055-1344, Vol. 12, no 1, 77-91 p.Article in journal (Refereed)
    Abstract [en]

    We construct and study a family of double-periodic almost entire solutions of the maximal surface equation. The solutions are parameterized by a submanifold of 3×3-matrices (the so-called generating matrices). We show that the constructed solutions are either space-like or of mixed type with the light-cone type isolated singularities.

  • Germeys, Jasper
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Germeys, Jasper
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Supervision of the Air Loop in the Columbus Module of the International Space Station2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Failure detection and isolation (FDI) is essential for reliable operations of complex autonomous systems or other systems where continuous observation or maintenance thereof is either very costly or for any other reason not easily accessible.

    Beneficial for the model based FDI is that there is no need for fault data to detect and isolate a fault in contrary to design by data clustering. However, it is limited by the accuracy and complexity of the model used. As models grow more complex, or have multiple interconnections, problems with the traditional methods for FDI emerge.

    The main objective of this thesis is to utilise the automated methodology presented in [Svärd, 2012] to create a model based FDI system for the Columbus air loop. A small but crucial part of the life support on board the European space laboratory Columbus.

    The process of creating a model based FDI, from creation of the model equations, validation thereof to the design of residuals, test quantities and evaluation logic is handled in this work. Although the latter parts only briefly which leaves room for future work.

    This work indicate that the methodology presented is capable to create quite decent model based FDI systems even with poor sensor placement and limited information of the actual design.

    [] Carl Svärd. Methods for Automated Design of Fault Detection and Isolation Systems with Automotive Applications. PhD thesis, Linköping University, Vehicular Systems, The Institute of Technology, 2012

  • Wallin Herlöfsson, Simon
    Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics.
    Wallin Herlöfsson, Simon
    Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics.
    Improvement and evaluation of the Integrated Biosensor Platform2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With a rising demand for low cost solutions to healthcare services, analysis, and toxicology, the Integrated Biosensor Platform developed by Acreo Swedish ICT and Linköping University, fills the gap where conventional sensors are not suitable. This report focuses the update of hardware and software in order to increase stability, introduce new sensors, and allow for wireless communication through NFC. Positive result and increased stability is presented, when measuring with a stable reference potential. The potential of NFC is shown in a breadboard setup and problems when printing an antenna is elaborated in terms of coil turns and size. An ethanol sensor is introduced to the platform and discussion manly focuses on characterization of the sensor. A potentiometric setup is also tested with low results and the problems of the current platform as a potentiometric sensor is discussed. From the collective results and a broader look at society is the justification of the platform existence evaluated. The need for the platform, especially as a mean to solve health problems in development countries, is argued to justify the environmental footprint of a disposable platform.

  • Sandberg, Erik
    et al.
    Linköping University, Department of Management and Engineering, Logistics & Quality Management. Linköping University, Faculty of Science & Engineering.
    Sandberg, Erik
    Linköping University, Department of Management and Engineering, Logistics & Quality Management. Linköping University, Faculty of Science & Engineering.
    Abrahamsson, Mats
    Linköping University, Department of Management and Engineering, Logistics & Quality Management. Linköping University, Faculty of Science & Engineering.
    Flödesorientering av globalt inköpsarbete2016Report (Other academic)
    Abstract [sv]

    Under senare år har globalt inköp fått en allt större strategisk betydelse för svenska handelsföretag. Tidigare forskning har visat att globalt inköpsarbete kan vara en avgörande konkurrensfördel, samtidigt som det innebär stora utmaningar. För at t framgångsrikt utnyttja globalt inköp som en konkurrensfördel behöver svenska handelsföretag bli mer flödesorienterade. Försörjningskedjans resurser som helhet, och inte bara företagets egna, behöver utnyttjas för att kunna skapa konkurrenskraft. Med bakgrund i det faktum att leveransförmågan och därmed kundservicen aldrig blir bättre än vad varuförsörjningen tillåter, spelar organiseringen av det globala inköpet en avgörande roll.

    Syftet med projektet är att öka förståelsen för hur svenska handelsföretag ska organisera sitt globala inköpsarbete för en högre grad av flödesorientering.

    Inom ramen för forskningsprojektet har forskningsfrågor adresserats om:

    1. parametrar för valet av inköpsregion och specifik leverantör,
    2. det fysiska flödet av produkter, samt
    3. organisationsformer för globalt inköp.

    Teoretiskt har projektet tagit utgångspunkt i litteratur om globalt inköp, flödesorientering och så kallad paradoxteori. Projektets empiriska bas är två fallstudier (Hultafors Group AB:s division för arbetskläder, Snickers, och Indiska Magasinet AB), samt en enkätstudie bland inköpschefer på svenska handelsföretag. Totalt har sju konferenspapper, ett journalpapper och två populärvetenskapliga artiklar författats inom ramen för projektet. Dessa är projektets huvudsakliga leverabler som alla på olika sätt bidrar till att besvara projektets syfte och forskningsfrågor. Den här rapporten är en populärvetenskaplig sammanfattning av forskningsprojektet.

    Resultaten visar att kostnader, service, ledtider, såväl som miljö- och CSR-relaterade parametrar spelar en viktig roll vid valet av region och specifik leverantör. Framförallt är det totalkostnaden (pris och någon form av ”hemtagningskostnad”) och ledtider som är de mest avgörande parametrarna. Miljö- och CSR-relaterade aspekter anses ha mindre betydelse. Paradoxperspektivet visar på behovet av att balansera prestationsmått gentemot varandra. Vid utvärderingar av en ny leverantör eller en ny leverantörsregion är det viktigt att ta hänsyn till ett brett spektrum av olika kriterier. För det fysiska flödet finns möjligheter till att konsolidera flödet till noder i Asien och/eller Europa. Studien visar att olika alternativ finns, och att det också finns alternativ till transportslaget båt, som idag dominerar på grund av förhållandevis låga transportkostnader. Dessa alternativ kan bli mycket intressanta i de fall där ledtiderna behöver kortas. För utformningen av en global inköpsorganisation visar våra resultat att tre av de mest tydliga parametrarna som är viktiga att förstå och analysera är:

    1. graden av vertikal integration, det vill säga i vilken utsträckning som handelsföretaget bör äga aktörer uppströms i försörjningskedjan,
    2. graden av ansvarstagande för försörjningskedjans prestation, det vill säga hela försörjningskedjans prestationer gentemot slutkunderna, samt
    3. graden av ömsesidigt, långsiktigt samarbete, det vill säga där företaget tillsammans med andra aktörer i försörjningskedjan utvecklar försörjningskedjans prestationer.

    För praktiker bidrar resultaten från detta projekt med nya insikter och perspektiv på hur företag bör tänka kring sin organisation av det globala inköpet. De ska fungera som en katalysator och inspiration för svenska handelsföretag som vill utveckla sin konkurrenskraft med hjälp av sitt globala inköp. Forskningsmässigt är globalt inköp i handelsföretag ett område som också fortsättningsvis är i behov av ny kunskap och utveckling. Den roll och betydelse som inköpsorganisationen har för konkurrenskraften förändras hela tiden och lär fortsätta göra det. Den snabba utvecklingen gör också att forskningen behöver hänga med: globalt inköp som forskningsobjekt behöver ständigt belysas med hjälp av nya teoretiska perspektiv och gamla sanningar behöver kontinuerligt utmanas och ifrågasättas. Ju mer global konkurrens inom handeln, desto viktigare blir frågan om hur det globala inköpet ska utformas.

  • Jarkman, Olof
    et al.
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship.
    Jarkman, Olof
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship.
    Kling, Rasmus
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship.
    Identifiering av parametrar som påverkar den affärsmässiga potentialen hos en uppfinning: Praktiska förslag för användning i en innovationsprocess2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The world is in constant change, driven by the development of new and updated products. Without these products, the growth in society would in the worst-case scenario stop completely. Can you imagine how your life would be without the railway, electricity or phone? All these examples have at some point started with a person that has an idea. This person then begins to think about it and at some point, begin the journey to reach the market with it. The ideas that become a product and is of technical nature and at the same time has a height of originality, is classified as an invention. When a market adopts an invention, it becomes an innovation. All ideas have not the same possibility to succeed in the market, some have great potential meanwhile some inventions just fail. In those cases, when a person aim to reach the market with an idea, it’s important to identify if it is one of those that have the possibility, and this is better to have knowledge about at as a early stage as possible. This is important to do, so the inventor can focus their resources, such as capital and time, in the right direction.

    We have investigated the parameters that affect the ability to achieve entry into a market to get a better understanding of whether an idea has commercial potential or not. We have also in addition to the investigation examined how these parameters can be used to influence the chance of success.

    The work was done through literature studies and interviews with people who have experience of inventions and the innovation process. The literature review and interviews led to several parameters that are of interest. By comparing this with the theory, we could analyse whether these had effects or not, and if so how much. Further analysis was performed to identify how these can be used in practise.

    The parameters that were identified as most important was originality, market awareness, knowledge and skills, motivation, transparency, timing and financial resources.

    We have also proved that theory and reality are far apart when it comes to how innovators work and how researchers think is the best way. The inventors believe that the technical solution is the most significant parameter, while the theory considers the need for the product is the most important. Our conclusion is that both the technical solution and the need are necessary to achieve entry into the market. The inventor can obtain knowledge about all these parameters by working with more structure, look at the idea more objectively and make inquiries with potential customers. We have also found that it is important to share the idea with others, but only to a certain level due to demands for patent grants, to be able to get help to gain knowledge about the parameters that the individual does not possess.

    There is much to gain from the success of verifying ideas at an early stage, so time and energy can be allocated to the ideas with the greatest potential to succeed. How innovators can use the parameters in a practical way are presented at the end of the report.

  • Public defence: 2017-02-17 13:15 Visionen, Hus B, Linköping
    Rankin, Amy
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Arts and Sciences.
    Rankin, Amy
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Arts and Sciences.
    Making Sense of Adaptations: Resilience in High-Risk Work2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    To cope with variations, disturbances, and unexpected events in complex socio-technical systems people are required to continuously adapt to the changing environment, sometimes in novel and innovative ways. This thesis investigates adaptive performance in complex work settings across domains, with a focus on examining what enables and disables successful adaptations, and how contextual factors shape performance. Examples of adaptive performance studies include a crisis command team dealing with the loss of key personnel, a crew coping with unreliable system feedback in the cockpit, and a nursing team managing an overload of patients. The two main contributions of this thesis is the analysis of cases of people coping with variations and disturbances, and the development of conceptual models to report findings, structure cases, and make sense of sharp-end adaptations in complex work settings. The findings emphasise that adaptive performance outside procedures and textbook scenarios at the sharp end is a critical ability to cope with variation and unexpected events. However, the results also show that adaptations may come at the cost of new vulnerabilities and system brittleness. Analysing adaptive performance in everyday events informs safety management by making visible limitations and possibilities of system design, organisational structures, procedures, and training.

    List of papers
    1. Sensemaking following surprise in the cockpit-a re-framing problem
    Open this publication in new window or tab >>Sensemaking following surprise in the cockpit-a re-framing problem
    2016 (English)In: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 18, no 4, 623-642 p.Article in journal (Refereed) Published
    Abstract [en]

    Re-framing is the process by which a person "fills the gap" between what is expected and what has been observed, that is, to try and make sense of what is going on following a surprise. It is an active and adaptive process guided by expectations, which are based on knowledge and experience. In this article, surprise situations in cockpit operations are examined by investigating the re-framing process. The results show difficulties that pilots have in re-framing following surprise, including the identification of subtle cues and managing uncertainties regarding automated systems, coping with multiple goals, tasks and narrow time frames and identifying an appropriate action. A crew-aircraft sensemaking model is presented, outlining core concepts of re-framing processes and sensemaking activities. Based on the findings, three critical areas are identified that deserve further attention to improve pilot abilities to cope with unexpected events; (1) identification of what enables and obstructs re-framing, (2) training to build frames and develop re-framing strategies and (3) control strategies as part of the re-framing process.

    Keyword
    Sensemaking; Surprise; Cockpit operations; Re-framing; Training
    National Category
    Production Engineering, Human Work Science and Ergonomics
    Identifiers
    urn:nbn:se:liu:diva-132839 (URN)10.1007/s10111-016-0390-2 (DOI)000386502500001 ()
    Note

    Funding Agencies|Man4Gen

    Available from: 2016-12-06 Created: 2016-11-30 Last updated: 2017-01-12
    2. Resilience in Everyday Operations: A Framework for Analysing Adaptations in High Risk Work
    Open this publication in new window or tab >>Resilience in Everyday Operations: A Framework for Analysing Adaptations in High Risk Work
    Show others...
    2014 (English)In: Journal of Cognitive Engineering and Decision Making, ISSN 1555-3434, Vol. 8, no 1, 78-97 p.Article in journal (Refereed) Published
    Abstract [en]

    Managing complexity and uncertainty in high risk, socio-technical, systems requires people to continuously adapt. Designing resilient systems that support adaptive behaviour requires a deepened understanding of the context in which the adaptations take place, enablers for successful adaptations and their affect the overall system. Also, it requires a focus on how people actually perform, not how they are presumed to perform according to textbook situations. We propose a framework to analyse adaptive behaviour in everyday situations where systems are working near the margins of safety. The examples that underlie the framework are derived from nine focus groups with representatives working with safety related issues in different work domains, including health care, nuclear, transportation and emergency services. Further, the variety space diagram is developed as a means to illustrate how system variability, disturbances and constraints affect work performance.

    Place, publisher, year, edition, pages
    Sage Publications, 2014
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-91989 (URN)10.1177/1555343413498753 (DOI)2-s2.0-84893856937 (ScopusID)
    Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2017-01-12Bibliographically approved
    3. A case study of factor influencing role improvisation in crisis response teams
    Open this publication in new window or tab >>A case study of factor influencing role improvisation in crisis response teams
    2013 (English)In: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 15, no 1, 79-93 p.Article in journal (Refereed) Published
    Abstract [en]

    Common characteristics of crisis situations are ambiguous and unplanned for events. The need for improvised roles can therefore be an imperative factor for the success of an operation. The aim of this study is to deepen the understanding of the processes taking place during improvised work ‘‘as it happens’’. A case study of a crisis management team at work is presented and provides an in-depth analysis of the information and communication flow of persons acting in improvised roles, including con- textual factors influencing the task at hand. The analysis suggests that three main factors lay behind decreased per- formance by the team when some of its members were forced to take on roles for which they lacked professional training; lack of language skills, lack of domain knowledge and insufficient organizational structure of the tasks. Based on the observations from this case study, we suggest three ways of improving a team’s performance and hence resil- ience when forced to improvise due to lack of personnel in one or more required competence areas. These are training to take on the responsibility for tasks or roles outside ones professional area of specialization, developing formal routines for changes in roles and tasks and developing and using tools and routines for information sharing.

    Place, publisher, year, edition, pages
    Springer, 2013
    Keyword
    Role improvisation, Crisis management, Resilience engineering, Organizational improvisation, Episode analysis
    National Category
    Other Engineering and Technologies
    Identifiers
    urn:nbn:se:liu:diva-80311 (URN)10.1007/s10111-011-0186-3 (DOI)000313737400010 ()
    Available from: 2012-08-23 Created: 2012-08-23 Last updated: 2017-01-12
    4. A framework for learning from adaptive performance
    Open this publication in new window or tab >>A framework for learning from adaptive performance
    2014 (English)In: Resilience engineering in practice. Vol. 2: Becoming resilient / [ed] Christopher P. Nemeth, Erik Hollnagel, Surrey: Ashgate, 2014, 2, 79-95 p.Chapter in book (Other academic)
    Place, publisher, year, edition, pages
    Surrey: Ashgate, 2014 Edition: 2
    Keyword
    Political Science, Labor & Industrial Relations, Psychology, Industrial & Organizational Psychology, Technology & Engineering, Technical Writing
    National Category
    Political Science Psychology
    Identifiers
    urn:nbn:se:liu:diva-133849 (URN)9781472425157 (ISBN)
    Available from: 2017-01-12 Created: 2017-01-12 Last updated: 2017-01-12Bibliographically approved
  • Lundgren, Silje
    et al.
    Linköping University, Department of Thematic Studies, The Department of Gender Studies. Linköping University, Faculty of Arts and Sciences.
    Lundgren, SiljeLinköping University, Department of Thematic Studies, The Department of Gender Studies. Linköping University, Faculty of Arts and Sciences.Lundqvist, MajaNationella sekretariatet för genusforskning, Göteborgs universitet.Pernrud, BjörnLinköping University, Department of Thematic Studies, The Department of Gender Studies. Linköping University, Faculty of Arts and Sciences.
    Gränser, mobilitet och mobilisering : nationell konferens för genusforskning : G16 : Linköping 23-25 november 2016: [Boundaries, mobility and mobilisation : Swedish conference för gender research : G16 : Linköping 23-25 november 2016]2016Conference proceedings (editor) (Other academic)
    Abstract [en]

    gr6 relates to current societal challenges, locally and globally, and discusses how gender research can contribute to an understanding of and interaction with various courses of events in the world we live in. The theme of the conference- Boundaries, Mobility and Mobilisation - refers to geopolitical, social and climate - related events that call for our attention and action. The conference invitation was broadly formulated, and the response from the gender research field has now become a programme that exhibits great diversity in perspectives, questions and problems, and that reflects a field that is ready to take on contemporary challenges with both enthusiasm and great creativity.

    The conference will offer in- depth and problematising discussions around boundaries, mobility and mobilisation. We will listen to contributions exploring repression, exercise of power and constructions of meanings linked to national boundaries, the epistemology of minority positions and the colonial history of Scandinavia, but also resistance and mobilisation in relation to colonial oppression, restored national border controls and structural racism. Participating researchers will take on major questions regarding the conditions for life and death for different bodies in our world and apply critical perspectives to concepts such as inclusion and diversity.

    I t has also been our ambition to make the conference accessible: through differentiated conference fees, sign language interpreting, accessibility ensured facilities, open and free events and wide-ranging participation by societal actors who in various ways are involved in the themes of the conference. This ambition implies a long series of judgement calls. Where should we draw the line for who qualifies for the lowest conference fee? Can we offer babysitting services? Who and which experiences are represented in the scientific committee? And how can we attract students and activists to the conference?

    The previous g-conferences have been offered in Swedish with occasional contributions in English. However, we see that not all gender researchers in Sweden use Swedish as their working language and want to actively include the broad research that in various ways relates to international contexts. The U nit of Gender Studies is characterised by great diversity in the languages used by the staff, and the entire sector continues to talk ab out 'internationalisation'. On the other hand, we do not want to reinforce the strong norm in academia of using English exclusively: man y researchers want to present their research in Swedish, and Swedish-speaking target groups are important to our production of knowledge. Our bilingual approach became the solution of choice, yet the ambition to be inclusive constantly encounters new issues that need to be taken into consideration. If we want to reach out to a broad audience in Linköping who rarely attend academic presentations, we may unintentionally create a barrier by using English as the presentation language. And how do we group the sessions as we need to thematise paper presentations based not only on content but also language?

    We will not know the results of our efforts to make the conference inclusive until afterwards. But we do know this: When we promote inclusion by arranging a gender research conference, with all the aspects of power asymmetries and differences that characterise the society we are trying to act in, it is a theorised practice , an act that challenges the very notion of a difference between theory and practice.

  • West, Emma (Editor)
    Linköping University, Department of Medical and Health Sciences, Division of Health Care Analysis. Linköping University, Faculty of Medicine and Health Sciences.
    West, Emma (Editor)
    Linköping University, Department of Medical and Health Sciences, Division of Health Care Analysis. Linköping University, Faculty of Medicine and Health Sciences.
    Året som gått 2016: Prioriteringscentrums verksamhetsberättelse2017Other (Other academic)
    Abstract [sv]

    I verksamhetsberättelsen summerar vi året som gått. Ett urval av uppdrag, aktuella projekt, konsult- och utbildningsinsatser presenteras. Du hittar även ett sammandrag av utgivna rapporter, publikationer och debattinlägg.

  • Wiss, Johanna
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Health Care Analysis. Linköping University, Faculty of Medicine and Health Sciences.
    Wiss, Johanna
    Linköping University, Department of Medical and Health Sciences, Division of Health Care Analysis. Linköping University, Faculty of Medicine and Health Sciences.
    Carlsson, Per
    Linköping University, Department of Medical and Health Sciences, Division of Health Care Analysis. Linköping University, Faculty of Medicine and Health Sciences.
    Prioritering av särläkemedel: en internationell utblick2016Report (Other academic)
    Abstract [sv]

    Denna rapport presenterar en översikt över hur fem europeiska länder hanterar subventionsbeslut av särläkemedel, dvs. läkemedel som används för att behandla patienter med svåra och sällsynta sjukdomar. Hälsoekonomiska utvärderingar visar att särläkemedel sällan är kostnadseffektiva när man utgår från traditionella gränsvärden avseende kostnad för vunnen hälsa. En ökning av antalet särläkemedel på den europeiska marknaden har bidragit till livliga diskussioner i Sverige och i andra länder om hur dessa ska hanteras inom ramen för rådande läkemedelssubventionssystem. Olika länder har hanterat frågan om dyra behandlingar riktade till patienter med sällsynta sjukdomar på olika sätt och utifrån ett svenskt perspektiv är det därför intressant att observera och inspireras av hur andra europeiska länder har hanterat frågan om särläkemedel.Syftet med denna rapport är: (1) Att beskriva prioriteringsprocessen av särläkemedel i Sverige, Nederländerna, Norge, Frankrike och England. Fokus ligger på de beslutskriterier som ligger till grund för beslut samt på hur prioriteringsprocessen ser ut; (2) Att redovisa lösningar och arbetssätt från respektive land som bidrag till den fortsatta diskussionen om prioritering och finansiering av särläkemedel i Sverige.

  • Marano, Magdalena
    Linköping University, Department of Management and Engineering, Carl Malmsten - furniture studies.
    Marano, Magdalena
    Linköping University, Department of Management and Engineering, Carl Malmsten - furniture studies.
    Fläckfritt: - ett kunskapsunderlag om borttagning av ringmärken på moderna ytbehandlingar2014Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [sv]

    Inom konservering och restaurering av möbler ligger uppgiften ofta i att få bort olika sorters ytskador, såsom fläckar och missfärgningar, så kallade ringar, som är vanligt förekommande på bords- och avställningsytor. Mitt arbete utgör ett slags kunskapssammanställning som samlar tryckta källor, intervjuer och egna praktiska experiment. Arbetet är tänkt att utgöra informationskälla vid hantering av ytbehandlingar och metoder för borttagning av fläckar, med fokus på ringmärken, i de transparenta ytbehandlingar som var vanligt förekommande i Sverige mellan 1900- och 1960-talen.

    Sammanställningen riktas till studenter och verksamma inom möbelkonservering och -restaurering samt till intresserade privatpersoner. Förhoppningen är att det i förlängningen kan bidra till en mer varsam behandling av skadade ytor, för att undvika att en del av möblers historik, patina och helhetsintryck går förlorade, samt även bidra till en generös hållning i fråga om yrkeshemligheter.

  • Stenlund, Sebastian
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Stenlund, Sebastian
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Testing Safety Critical Avionics Software Using LBTest2016Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    A case study for the tool LBTest illustrating benets and limitations of the tool along the terms of usability, results and costs. The study shows the use of learning based testing on a safety critical application in the avionics industry. While requiring the user to have the oretical knowledge of the tools inner workings, the process of using the tool has benefits in terms of requirement analysis and the possibility of finding design and implementation errors in both the early and late stages of development

  • Pusztai, Rita
    et al.
    Linköping University, Department of Medical and Health Sciences.
    Pusztai, Rita
    Linköping University, Department of Medical and Health Sciences.
    Kusic, Irena
    Linköping University, Department of Medical and Health Sciences.
    Sjuksköterskors upplevelse av att bedöma smärta hos demenssjuka patienter med afasi: En kvalitativ intervjustudie2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Demographic changes in the coming decades imply a substantial increase in the number of elderly in society. Dementia and pain are common in this groups, therefore health care system facing a challenge to provide this people with appropriate health care. Aphasia in dementia patients further complicate the pain assessment.

    Aim: To describe the nurses’ experiences of pain assessment in dementia patients with aphasia.

    Method: A qualitative interview study with an inductive approach was conducted. Data was collected through semi-structured interviews and analyzed through a manifest content analysis. Twelve nurses working in geriatric care were interviewed.

    Results: Three categories were identified with ten associated sub categories during the data analysis: Collaboration, Pain Assessment, and also Knowledge and Competence.

    Conclusion: The study provides insight into the tools nurses may use in the pain assessment at a geriatric emergency unit. Utilization of Abbey Pain Scale, nursing staff at nursing home residence, healthcare team at the unit, theoretical knowledge and clinical experience can lead to more effective pain management in people with dementia. More education, increased knowledge about pain, dementia and aphasia and a more specific pain assessment instrument are necessary to meet the complex care needs of these patients.

  • Obinwa, Pia
    Linköping University, Department of Medical and Health Sciences.
    Obinwa, Pia
    Linköping University, Department of Medical and Health Sciences.
    Stabilitet och hållbarhet av reagens efter nedfrysning och frystorkning för användning vid analys av trombocytfunktion med flödescytometri2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introduction: Hemostasis is a complex system in the body that maintains blood flow and prevents bleeding. Patients with platelet disorders are at the risk of mucocutaneous bleedings and at Clinical chemistry in Linköping platelet function is measured with flow cytometry. The platelet response to various agonists is measured with fluorescently labeled platelet antibodies. The aim of this study was to evaluate the stability of the frozen reagents used for platelet function testing. Further the durability of platelet antibodies after freezing and freeze-drying was tested.  

    Method: Platelet antibodies were prepared for freezing/freeze-drying in buffer and were analyzed at three different occasions using blood from 2 to 3 individuals with flow cytometry. Agonists and blood were added on the day of analysis. The reagent stability test was evaluated statistically using one-way ANOVA with Bonferronis post-hoc test.

    Results: The slight drop in percent positive platelets and median fluorescence intensity (MFI) seen over time in the reagent stability test was not statistically significant (p>0,05). All platelet antibodies could be used after freezing/freeze-drying. The results are showing a declining trend, especially for MFI values.

    Conclusion: The frozen reagents used for platelet function testing is stabile up to 36 months. The results from the freeze-drying/freezing indicate that all platelet antibodies keep some activity but that some are more sensitive than others. Some antibodies could not be evaluated due to concentration of agonist in the sample being too low to induce activation. Due to individual variations further studies with more participants and more agonists in their optimal concentrations are needed.

  • Werin, Atle
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Werin, Atle
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Use of a Multiplexer to get Multiple Streams Through a Limited Interface: Encapsulation of digital video broadcasting streams2016Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
    Abstract [en]

    In digital video broadcasting, sometimes many sources are used. When handling this broadcast a problem is a limited interface that has a fixed number to input channels but overcapacity in data transfer rate. To be able to connect more inputs to the interface a protocol that lets the user send more than one channel on a connection is needed. The important part for the protocol is that it keeps the input equal to the output both in timing and in what data is sent. These are done by encapsulating the data and use a header containing information for recreating the input. To solve the timing constraint dynamic buffer are used that makes all data evenly delayed. To validate the functionality of the protocol a test designed is implemented in VHDL and simulated.

  • Ralmé, Sascha
    Linköping University, Department of Social and Welfare Studies.
    Ralmé, Sascha
    Linköping University, Department of Social and Welfare Studies.
    Kaffesugen - ett adjektiv och en anledning att träffas.: Om äldres syn på sin vardag.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie är att belysa hur äldre ser på och beskriver sina vardagsmiljöer, samt vilka möjligheter äldre upplever sig ha att påverka den egna vardagen. På en träffpunkt för äldre har deltagande observation med tematiskt öppna intervjuer genomförts under två veckor. Studien har resulterat i följande huvudteman: mötesplatser, gemenskap, beroende av andra, äldre och samhället, teknik samt dövgruppen. Dessa teman återger centrala element ur de äldres dagliga liv. Analysen av den insamlade empirin har gjorts utifrån två socialgerontologiska teorier, politisk ekonomi och åldrande samt livsloppsteorin. Dessutom har begrepp som ålderism, tunna band och dövkultur använts. Studien har visat att träffpunkten som mötesplats för äldre kompenserar när det sociala nätverket minskar. Att ha något att göra, ge en känsla av gemenskap och struktur åt vardagen. För äldre döva är rätten till teckenspråket och möjlighet att träffa andra döva mycket centralt. Dessutom är åldrandet och medföljande funktionsnedsättning något som präglar besökarnas vardag. Att behöva andras hjälp och olika samhälls insatser när orken avtar, är något som tvingar den enskilda att accepterar att egna val och önskemål försvåras, exempelvis gällande mat och tidsplanering eller valet av bostad. När allt kommer omkring bestäms samhällets insatser utifrån politiska och ekonomiska ramar. I de tematiskt öppna intervjuerna blir det tydligt att dessa ramar, under vilka olika insatser verkar, har en märkbar påverkan på äldres vardag.

  • Alwerud, Einar
    et al.
    Linköping University, Department of Social and Welfare Studies, Social Work.
    Alwerud, Einar
    Linköping University, Department of Social and Welfare Studies, Social Work.
    Smajic, Melisa
    Linköping University, Department of Social and Welfare Studies, Social Work.
    Med känslor i portföljen: En kvalitativ studie om socialsekreterare som möterensamkommande barn2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I dagsläget kommer det ett stort antal ensamkommande barn till Sverige. Då

    målgruppen har vuxit i det svenska samhället har arbetsbelastningen ökat för de

    socialsekreterare som arbetar med målgruppen. Mot bakgrund av detta anser vi att

    det är ett viktigt område att studera inom socialt arbete. Studien syftar till att belysa

    socialsekreterares möte med ensamkommande barn. Vidare vill vi lyfta fram hur

    socialsekreterarna i studien hanterar de konsekvenser som kan uppstå i ett sådant

    möte.

    Coping-teorin kommer att användas för att förstå vilka strategier socialsekreterare

    använder för att hantera psykiska påfrestningar i arbetet. Då det inte finns mycket

    forskning kring vårt valda problemområde har vi använt oss av tidigare forskning

    som belyser hur yrkesverksamma inom snarlika områden hanterar svåra möten

    med klienter. Utöver det har vi tagit fram forskning kring arbetssituationens

    betydelse för hur en socialsekreterare hanterar konsekvenser i mötet med klienten.

    För att få fram relevant information som svarar på studiens syfte har nio

    semistrukturerade intervjuer genomförts. Den insamlade empirin har analyserats

    med kvalitativ innehållsanalys. Utifrån analysen fick vi fram tre teman som

    studiens resultatredovisning bygger på. Dessa teman är När världen står på

    tröskeln, Att inte slukas med samt Skillnad på då och nu.

  • Ohlin, Emelie
    et al.
    Linköping University, Department of Social and Welfare Studies, Social Work.
    Ohlin, Emelie
    Linköping University, Department of Social and Welfare Studies, Social Work.
    Börjesson, Hanna
    Linköping University, Department of Social and Welfare Studies, Social Work.
    ”Det jag säger är ju deras lag”: Socialarbetares resonemang om maktens och handlingsutrymmets tvetydighet på en SiSinstitution2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Makt inom socialt arbete, speciellt inom myndighetsutövning, har varit ett återkommande tema under vår tid på socionomprogrammet vid Linköpings universitet. Däremot har det talats mindre kring makt inom verksamheter som arbetar på uppdrag av socialtjänsten. Att socialarbetare på exempelvis SiSinstitutioner har ett maktövertag gentemot de placerade ungdomarna, i form av exempelvis indragna permissioner och inlåsning, är något som forskarna inom ämnet är överens om. Under vår verksamhetsförlagda utbildning (VFU) upptäckte vi att socialarbetare som arbetar på uppdrag av socialtjänsten har stort handlingsutrymme i sitt arbete då vi båda genomförde vår VFU inom sådana verksamheter. Det bekräftas även av litteraturen som menar att det medför dilemman för personalen.

    Studien syftar till att undersöka och analysera hur personal på en SiS-institution för ungdomar beskriver och resonerar kring sin maktbefogenhet och sitt handlingsutrymme. För att undersöka detta har vi genomfört åtta semistrukturerade intervjuer på en SiS-institution belägen i Sverige. Genom intervjuerna fann vi tre empiriskt grundade teman: Vi och Dom, “Det jag säger är ju deras lag” samt Maktens och handlingsutrymmets tvetydighet. Studiens analys vilar på Erving Goffmans Totala institutioner och Michel Foucaults teori om makt, med teoriernas tillhörande begrepp.

    Utifrån intervjuerna framkommer det att personalen resonerar olika kring sitt handlingsutrymme. Vissa anser att de har stort handlingsutrymme, medan andra anser att det är litet. Främst fann vi att personalens arbete styrs av begreppen lugn och säkerhet. Det framkom att personalens makt uttryckte sig genom att dagarna präglades av struktur och fasta tider, samt genom särskilda befogenheter och arbetsmetoden teckenekonomi. Sammanfattningsvis kan det, utifrån det empiriska materialet, konstateras att socialarbetares makt och handlingsutrymme kan ses som tvetydigt då det både stärker och hämmar dem i det dagliga arbetet.

  • Wilhelmsson, Cornelia
    Linköping University, Department of Culture and Communication.
    Wilhelmsson, Cornelia
    Linköping University, Department of Culture and Communication.
    Feminist Fairy Tales: Blurred Boundaries in Angela Carter’s Rewritings of Classical Fairy Tales2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay examines Angela Carter’s feminist rewritings of classical fairy tales. By examining the original fairy tales and comparing them to what Angela Carter published I aim to highlight a feminism that is subtle and non-binary. In the analysis I draw on ideas presented by Hélène Cixous as well as Simone de Beauvoir.

    Furthermore, a pedagogical reflection is included to show ways in which these stories could be incorporated in the upper- secondary school. 

  • Oskarsson, Miranda
    et al.
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Oskarsson, Miranda
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Bergström, Ida
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Talängslan i främmande språk: En litteraturstudie som undersöker elevers oro över att tala engelska2015Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Enligt läroplanen ska elever lära sig att kommunicera på engelska och utveckla tillit till sin språkliga förmåga. För att som lärare kunna stötta eleverna i detta måste man veta vad som kan hindra denna utveckling. Därför har vi valt att i denna litteraturstudie ta del av forskning som berör elevers språkliga ängslan vid tal av ett främmande språk. Våra forskningsfrågor har varit: Vad innebär det att tala ett främmande språk? Vad säger forskning om elevers oro över att tala ett främmande språk? Hur kan läraren stötta eleverna i att tala och känna mindre språklig ängslan? Vi har beskrivit talförmågan utifrån fem kommunikativa kompetenser: språklig kompetens, pragmatisk kompetens, diskursiv kompetens, strategisk kompetens och flyt i språket. Vi har dessutom gett en överblick om vad olika teoretiska synsätt och undervisningsmetoder säger om inlärningen och produktionen av ett främmande språk. Vår andra forskningsfråga har vi besvarat genom att sammanställa tolv empiriska studier. Det har framkommit genom forskningen att vissa elever upplever språklig ängslan, framför allt när de ska tala, vilket påverkar deras språkliga prestationer. Eleverna är rädda för att göra grammatiska fel, uttalsfel och att inte hitta rätt ord. Forskningen har olika syn på korrigeringens roll i klassrummet men resultaten visar att eleverna kan bli oroliga vid överdriven korrigering. Dessutom behandlar forskningen vilket fokus undervisningen ska ha. Framförallt väger man korrekthet mot innehåll i språket. Attityd och motivation har också visats påverka elevernas språkliga ängslan och prestationer i klassrummet. Genom resultaten anser vi att lärare måste ta hänsyn till faktumet att elever upplever språklig ängslan och jobba aktivt för att elever ska känna sig trygga och fria i sitt tal av engelska. Detta kan göras genom att behandla olika aspekter av klassrumsmiljön, nämligen: korrigering, undervisningsfokus, undervisningsnivå, motivation och utökad användning av målspråket. Lärare behöver alltså utvärdera sina val i klassrummet för att kunna styrka eleverna på bästa sätt i deras strävan att få tilltro till sig själva i inlärningen av engelska. Vi skulle vilja se mer forskning om ämnet i svensk kontext och yngre åldrar, vilket vi har saknat.

  • Köhlström, Julia
    et al.
    Linköping University, Department of Social and Welfare Studies.
    Köhlström, Julia
    Linköping University, Department of Social and Welfare Studies.
    Hjelte, Emma
    Linköping University, Department of Social and Welfare Studies.
    Att finna, eller att inte finna: En kvalitativ studie gällande tillgänglighet och information kring kommunala e-tjänster och webbsidor rörande ekonomiskt bistånd inom socialtjänsten.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The digitalizing has affected the community as a whole, but current research about social work and its digitalization is lacking. Because of which, we have chosen to study and discuss this area - empirical and theoretical. This study aims to analyze and compare social services municipal websites regarding information about financial aid related to the current legislation, media theory and the importance of language. This study scrutinizes, through equality and availability, the usage of e-services regarding financial aid in municipals.

    The empirical data, which is gathered from ten Swedish municipal websites regarding financial aid, is analyzed by qualitative content analysis complemented by quantification, through frequency analysis. From the analysis a domain emerged; availability, and two themes; information and communication.

    This study has its base in The second media age, McDonaldization, semiotics and isomorfism. The theory of semiotics has contributed to a review regarding latent and manifest information, isomorfism to explain differences and similarities, and McDonaldization to explore efficiency.

    The result of the study indicates both similarities and differences among the websites. Differences were found concerning availability, intelligibility, and the usage of legislation. Similarities tend to exist in which the information on the websites were based on Social Services act, the municipals described the application process similar, and the information was limited to Swedish language.

    The result of the study discuss availability regarding communication and information. The result relates to equality through access to e-services within social services financial aid and opportunities to empowerment. The result of this study specify the need of proceeded research concerning digitalizing and e-services within social services, among other things on user and personnel perspective.

  • Siljebäck, Frida
    et al.
    Linköping University, Department of Social and Welfare Studies.
    Siljebäck, Frida
    Linköping University, Department of Social and Welfare Studies.
    Sved, Satu
    Linköping University, Department of Social and Welfare Studies.
    "allt man gör är fel": En diskursanalys av socionomstudenters resonemang kring första linjens chef inom äldreomsorgen2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna studie har vi använt oss av ett kvalitativt enkätformulär som skickats ut till socionomstudenter vid svenska universitet. Vi har iakttagit det språkbruk som socionomstudenter förmedlar i enkätsvaren om diskursen: första linjens chef inom äldreomsorg. När pensionsavgångar inom arbetsfältet ökar och de äldre i befolkningen blir en växande demografisk grupp, är det i de akademiska utbildningarnas och äldreomsorgens intresse att erbjuda ett sätt för socionomstudenter att bli första linjens chefer. Med studien vill vi, med en socialkonstruktionistisk utgångspunkt, ge en verklighetsbild av hur socionomstudenter resonerar kring första linjens chef. Med hjälp av diskursanalys har vi funnit diskurser i socionomstudenternas svar och dessa diskurser är: negativ verklighetssfär, socionomutbildningen, intresse, arbetsvillkor och kompetens/erfarenhet. Även om informanterna studerar vid olika svenska universitet, har vi funnit att det råder konsensus om den negativa verklighetssfären. Vi identifierar möjligheten att socionomstudenterna påverkas av den verklighetssfär som vidarebefordras av universiteten. Då vi har funnit ett bristande intresse om äldreomsorg och rollen som första linjens chef, frågar vi oss själva vem som är ansvarig för att belysa fältet - universitet eller studenter? Vi tar även hänsyn till ett möjligt behov av vidare introduktion för socionomer som nyligen utexaminerats, för att skapa ett eventuellt intresse av diskursen.