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  • Nordström, Jan
    et al.
    Linköping University, Department of Mathematics, Computational Mathematics. Linköping University, Faculty of Science & Engineering.
    Ruggiu, Andrea Alessandro
    Linköping University, Department of Mathematics, Computational Mathematics. Linköping University, Faculty of Science & Engineering.
    Dual Time-Stepping Using Second Derivatives2019Report (Other academic)
    Abstract [en]

    We present a modied formulation of the dual time-stepping technique which makes use of two derivatives in pseudo-time. This new technique retains and improves the convergence properties to the stationary solution. When compared with the conventional dual time-stepping, the method with two derivatives reduces the stiness of the problem and requires fewer iterations for full convergence to steady-state. In the current formulation, these positive eects require that an approximation of the square root of the spatial operator is available and inexpensive.

  • Ruggiu, Andrea Alessandro
    et al.
    Linköping University, Department of Mathematics, Computational Mathematics. Linköping University, Faculty of Science & Engineering.
    Nordström, Jan
    Linköping University, Department of Mathematics, Computational Mathematics. Linköping University, Faculty of Science & Engineering.
    Eigenvalue analysis for summation-by-parts finite difference time discretizations2019Report (Other academic)
    Abstract [en]

    Diagonal norm finite-difference based time integration methods in summation-by-parts form are investigated. The second, fourth and sixth order accurate discretizations are proven to have eigenvalues with strictly positive real parts. This leads to provably invertible fully-discrete approximations of initial boundary value problems.

    Our findings also allow us to conclude that the second, fourth and sixth order time discretizations are stiffly accurate, strongly S-stable and dissipatively stable Runge-Kutta methods. The procedure outlined in this article can be extended to even higher order summation-by-parts approximations with repeating stencil.

  • Grimsdal, Gunnar
    et al.
    Linköping University, Department of Computer and Information Science.
    Lundgren, Patrik
    Linköping University, Department of Computer and Information Science.
    Examining the Impact of Microarchitectural Attacks on Microkernels: a study of Meltdown and Spectre2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Most of today's widely used operating systems are based on a monolithic design and have a very large code size which complicates verification of security-critical applications. One approach to solving this problem is to use a microkernel, i.e., a small kernel which only implements the bare necessities. A system usinga microkernel can be constructed using the operating-system framework Genode, which provides security features and a strict process hierarchy. However, these systems may still be vulnerable to microarchitectural attacks, which can bypassan operating system's security features, exploiting vulnerable hardware.

    This thesis aims to investigate whether microkernels are vulnerable to the microarchitectural attacks Meltdown and Spectre version 1 in the context of Genode. Furthermore, the thesis analyzes the execution cost of mitigating Spectre version 1 in a Genode's remote procedure call.

    The result shows how Genode does not mitigate the Meltdown attack, which will be confirmed by demonstrating a working Meltdown attack on Genode+Linux. We also determine that microkernels are vulnerable to Spectre by demonstrating a working attack against two microkernels. However, we show that the cost of mitigating this Spectre attack is small, with a cost of < 3 slowdown for remote procedure calls in Genode.

  • Engsjö-Lindgren, My
    Linköping University, Department of Management and Engineering.
    Euroskepticismen hos VP och SD: Likheter, skillnader, traditionella argument och alternativ till EU: En jämförande fallstudie av Vänsterpartiet och Sverigedemokraternas euroskepticism2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to describe the hard euroscepticism in two Swedish parties: The Swedish democrats and the Left party, by describing and comparing their arguments. I will mainly do this by examining if they have traditional features in their arguments and if they have an alternative system to the EU. I’m using a study by Van Bohemen et al and the Benchmark theory by De Vries to analyze the results. The arguments are found in their official party documents.

    By describing, comparing and analyzing the arguments I’ve found that both parties arguments have anti-institutional and protectionist features. The Left party also argues against economic inequality and the Swedish democrats arguments have ethnocentric features. Besides the traditional ‘arguments’ The Left party also argue that the union is unequal, neoliberal and disregarding the climate changes. Both parties also have an alternative system to the EU. The Left party wants to replace it with international organizations which works against for instance inequality and climate changes. The Swedish democrats wants a deepened Nordic collaboration, which would help the economy as well as protect the Nordic identity.

    My conclusion is that both parties have traditional Eurosceptic features and an alternative system. There are some similarities as well as differences in their arguments and the differences are mainly ideological.

  • Besslich, Valerie
    et al.
    Linköping University, Department of Management and Engineering.
    Zalizniuk, Ekaterina
    Linköping University, Department of Management and Engineering.
    The Knowledge Creation Process in High Reliability Organizations: A case study on intra-team learning at the Lambohov Fire Station2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Each organization has its specifics that affect the way knowledge is created and transferred. The existing literature in the field of knowledge creation, studies contemporary organizations and currently does not consider special cases such as high reliability organizations. Therefore, the aim of this thesis is to complement the existing knowledge creation model by describing the knowledge creation process for high reliability organizations using the case study of the Lambohov Fire Station. A qualitative case study was conducted and carried out with the help of Lambohov Fire Station through non-participant observations and semi- structured interviews with one of the fire brigades. Our research has revealed that the learning processes in HROs differs from the existing theoretical framework. According to the literature, knowledge is created through conversion of tacit and explicit knowledge, while at the fire station the conversion involves tacit and implicit types of knowledge.

  • Thorslund, Gustav
    Linköping University, Department of Management and Engineering, Machine Design.
    Stroller Service System: How to make customer products sustainable within the planetary boundaries - using the case product ‘stroller’, PSS and a Design Thinking approach2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Physical customer products have an environmental impact, such as greenhouse gas emissions, due to the use of virgin resources from cradle-to-grave, especially when the origin of the material is from fossil resources. This thesis aims to create a circular business model, by investigating the product ‘stroller’ and place it in a Product Service System, where the user subscribes to the Stroller Service System. This means that the product gets a service function: ‘transportation of a child’, mapped with a user-centered approach. The main objective is to lower the ecological footprint by adopting a modular design including bio-based material and stainless steel, and also include services to address economical and social sustainability goals. The methodology that is used is divided into two parts: Status Analysis – which consists of stroller related literature study, literature review and case study, and the second part is the Design Process – creating the product-, service- and system design. The results are grounded in user insights, life cycle assessment and co-creation with experts, where the conclusions are that a PSS Model Stroller should be used by 4-6 users which translate to about 15-20 years of usage for the steel layer. The way of refurbishing the strollers is done by contract workers that exist where the users exists, i.e. Ease Stroller Hub, who change the bio-based material in-between the use-phases and hands over the refurbished stroller to the next user. Add-on services of access to car pools and grocery delivery is included in the system to ease the stroller user’s everyday life and is a way to designing out the need of owning a car, to lower the overall environmental impact.

  • Kurtovic, Amar
    Linköping University, Department of Management and Engineering, Political Science.
    Gränsöverskridande medborgares tankesätt: En intervjustudie om etableringen av den bosniska diasporan i Sverige.2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Den bosniska diasporan i Sverige är en etablerad grupp av individer som deltar både i samhället i Sverige och samhället i Bosnien och Hercegovina. Studien baseras på semi-strukturerade intervjuer som har gjorts på bosnier i Sverige och inom dessa intervjuer så identifieras och analyseras olika relevanta teman och mönster. I denna studie ifrågasätter jag genom vilka gränsöverskridande aktiviteter den bosniska diasporan etablerar sin närvaro i båda samhällena. Studien belyser de politiska, ekonomiska och sociokulturella aktiviteter som den bosniska diasporan i Sverige upprätthåller genom transnationella nätverk som binder samman Sverige och Bosnien och Hercegovina. Jag undersöker även hur den bosniska diasporan bildades i Sverige samt vad det innebär att vara en gränsöverskridande medborgare för den grupp av individer som den bosniska diasporan i Sverige består av. Den bosniska diasporan i Sverige etablerar sin närvaro genom en rad olika gränsöverskridande aktiviteter som består av politiskt, ekonomiskt och sociokulturellt engagemang till hemlandet, Bosnien och Hercegovina.

  • Larsson, Susanna
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Monocular Depth Estimation Using Deep Convolutional Neural Networks2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    For a long time stereo-cameras have been deployed in visual Simultaneous Localization And Mapping (SLAM) systems to gain 3D information. Even though stereo-cameras show good performance, the main disadvantage is the complex and expensive hardware setup it requires, which limits the use of the system. A simpler and cheaper alternative are monocular cameras, however monocular images lack the important depth information. Recent works have shown that having access to depth maps in monocular SLAM system is beneficial since they can be used to improve the 3D reconstruction. This work proposes a deep neural network that predicts dense high-resolution depth maps from monocular RGB images by casting the problem as a supervised regression task. The network architecture follows an encoder-decoder structure in which multi-scale information is captured and skip-connections are used to recover details. The network is trained and evaluated on the KITTI dataset achieving results comparable to state-of-the-art methods. With further development, this network shows good potential to be incorporated in a monocular SLAM system to improve the 3D reconstruction.

  • Boström, Axel
    et al.
    Linköping University, Department of Culture and Communication.
    Pettersson, Martin
    Linköping University, Department of Culture and Communication.
    Läsförståelse och läsarter i två centrala kunskapsmätningar: –En forskningsöversikt över svenska elevers resultat i de nationella provens och PISA-undersökningarnas läsförståelsedelar2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med den här uppsatsen är att undersöka vad forskningen säger om vilken slags läsning som testas i de nationella proven och PISA, svenska elevers resultatutveckling i PISA över tid, samt att redogöra för undervisningsmetoder för läsförståelse. Resultaten visar att de läsarter som prövas i de bägge proven är relativt lika, men att vissa läsarter får olika stort utrymme i de olika proven. Svenska elevers läsförståelse utifrån PISA visar sig ha försämrats över tid. Gällande undervisningsmetoderna redogörs det för två olika metoder där störst fokus har lagts på litteratursamtalet.

  • Riddervold Sandberg, Eva
    Linköping University, Department of Behavioural Sciences and Learning.
    Neural Substrates Correlated with Magnitude Processing in Children and Adults: An fMRI study examining the Triple Code Model of numerical cognition2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Triple Code Model (TCM) of numerical cognition has become one of the most predominantly theories for how humans perceive, manipulate, and communicate numerical information. It builds on the notion that there exist three functionally distinct but neurologically connected codes that handle manipulations of different numerical input (non-symbolic magnitudes, symbolic representations, and verbal number words).

    In this study, we add a developmental perspective by collecting child data and comparing it to existing adult data. The main question is whether or not children elicit the same neural correlates as adults while performing three different number comparison tasks in line with TCM. Neuroimaging data using fMRI were collected for a total of 20 participants (ten children and ten adults). The results suggest that children rely on more right-lateralized regions and that a developmental shift towards the left hemisphere and associated language areas occur during acquisition of mathematical proficiency.

  • Bjerkander, Rasmus
    et al.
    Linköping University, Department of Behavioural Sciences and Learning.
    Welin, Camilla
    Linköping University, Department of Behavioural Sciences and Learning.
    SOLUS 2.0: KOGNITIV BETEENDETERAPI OCH INTERPERSONELL PSYKOTERAPI MOT OÖNSKAD ENSAMHET: – En randomiserad kontrollerad studie av internetbehandling mot ensamhet2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Loneliness is associated with a wide range of mental and physical health issues across all groups in society. The condition has been subject to previous research, though few treatments have been designed and tested. The purpose of this study was to analyze the effects of internet-based cognitive behavioral therapy (ICBT) and internet-based interpersonal psychotherapy (IIPT) with a randomized controlled design. Potential effects on quality of life and comorbid symptoms were also analyzed. Eventual differences in effect between the treatments were analyzed with an exploratory purpose.

    The 116 participants were randomized to ICBT (n = 46), IIPT (n = 46) or a control group (n = 24) where participants were put on a waitlist. Loneliness, quality of life and comorbid symptoms were measured in all groups before and after a nine-week treatment period. At post-measure, the ICBT-group reported significantly lower loneliness (Hedges g = 0.93) and significantly higher quality of life (Hedges g = 0.73) than the control group. No significant differences were found between the IIPT-group and the control group or between the ICBT-group and the IIPT-group. Future research should replicate this study with a larger sample to detect any smaller treatment effects. The results of the SOLUS-study show great potential for ICBT as a treatment for loneliness and calls for further research on the effects of IIPT against loneliness.

  • Malinowska, Marcelina
    et al.
    Linköping University, Department of Behavioural Sciences and Learning.
    Stolt, David
    Linköping University, Department of Behavioural Sciences and Learning.
    ”Homosexualitet är någonting hemskt och jag är på grund av det helt värdelös.”: Homosexuella personers upplevelser och hantering av minoritetsstress i Sverige2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna examensuppsats var att kvalitativt undersöka upplevelsen av minoritetsstress samt dess påverkan och hantering hos homosexuella i Sverige. Detta gjordes genom semistrukturerade intervjuer med tio personer i åldern 22 till 44 år, vars berättelser analyserades med hjälp av en tematisk analys. Resultatet visar på en utbredd upplevelse av minoritetsstress inom flera områden i samhället och livet. Minoritetsstressen berodde på alltifrån hat och avståndstagande, diskriminering, utanförskap, heteronormativt bemötande, exotifiering och internaliserad homofobi till problem vid kontakt med myndigheter, vård och juridik. Minoritetsstressen upplevdes ge en sämre psykisk hälsa, ge upphov till komplexa negativa känslor, begränsa livsutrymmet, dränera energi samt ge upphov till en förhöjd rädsla och vaksamhet för potentiellt ofarliga situationer. Strategier för hantering av minoritetsstressen omfattade allt från socialt stöd, arbete med sin självbild och gränssättning till engagemang för hbtq+- frågor. Informanternas vittnesmål gick i linje med internationell forskning på samma område och kunde vidare förstås när de ställdes bredvid tidigare fynd och teorier kring minoritetsstress och hanteringsstrategier. Vittnesmålen visade även på minoritetsstressens komplexa verkan och genes. Resultatet indikerar ett stort behov av kunskap om homosexuellas utsatthet och livsvillkor inom samhällets alla arenor. Vidare forskning rörande minoritetsstressens omfattning, intersektion med andra minoritetspositioner samt fördjupning kring de olika delområden denna examensuppsats har berört bedöms nödvändig i framtiden.

  • Hjalmarsson, Johanna
    Linköping University, Department of Computer and Information Science.
    Designa ett gränssnitt för enkel installation: Informationsarkitektur, mentala modeller och användarcentrerat arbetssätt2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Föreliggande arbete ämnade undersöka hur mentala modeller kan stödjas i en informationsarkitektur i ett administratörsgränssnitt (specifikt för systemet Phoniro Care) samt ta fram riktlinjer för fortsatt och framtida design. Arbetet utfördes i samarbete med företaget Phoniro med målet att anpassa installationsprocessen för larmmodulen i systemet Phoniro Care till användare i verksamheten. Genom designprocessen tillämpades ett användarcentrerat arbetssätt genom metodik såsom kontextuella observationer, card sorting och deltagande design. Utifrån detta framkom resultatet att användarnas mentala modeller av systemet motsvarade en hierarkisk struktur med grupperingar. Ytterligare resultat var ett flöde för installationsprocessen. Med detta som grund bildades en ny informationsarkitektur som visualiserades med stöd från data samt designprinciper. Den visuella designen som skapades anses kunna fungera som ett underlag för framtida arbete med utformningen liksom de dokumenterade designmål och designbeslut som tagits genom arbetets gång. 

  • Larsson Alm, Kevin
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Automatic Speech Quality Assessment in Unified Communication: A Case Study2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Speech as a medium for communication has always been important in its ability to convey our ideas, personality and emotions. It is therefore not strange that Quality of Experience (QoE) becomes central to any business relying on voice communication. Using Unified Communication (UC) systems, users can communicate with each other in several ways using many different devices, making QoE an important aspect for such systems. For this thesis, automatic methods for assessing speech quality of the voice calls in Briteback’s UC application is studied, including a comparison of the researched methods. Three methods all using a Gaussian Mixture Model (GMM) as a regressor, paired with extraction of Human Factor Cepstral Coefficients (HFCC), Gammatone Frequency Cepstral Coefficients (GFCC) and Modified Mel Frequency Cepstrum Coefficients (MMFCC) features respectively is studied. The method based on HFCC feature extraction shows better performance in general compared to the two other methods, but all methods show comparatively low performance compared to literature. This most likely stems from implementation errors, showing the difference between theory and practice in the literature, together with the lack of reference implementations. Further work with practical aspects in mind, such as reference implementations or verification tools can make the field more popular and increase its use in the real world.

  • Lind-Hård, Viktor
    Linköping University, Department of Computer and Information Science.
    What meets the eye: Naturalistic observations of air traffic controllers eye-movements during arrivals using eye-tracking2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    How do air traffic controllers, or ATCos, distribute visual attention and can it vary between controllers? In this study, using primarily eye-tracking data and a couple of on-site interviews, these questions are explored. Two ATCos, with the most similar landings, had their eye-movements recorded with Tobii pro glasses 2 and further analysed by categorizing every fixation into different areas of interest during four landings. Two more ATCos were interviewed briefly during an observational visit to the control tower. The results showed that the ATCos distributed their attention fairly equally between the outside of the control tower and the inside. When attending to something outside the runway was the focus and when attention was inside the control tower the radar was usually the focus. The ATCos differed in their attention distribution by the presumably more experienced ATCo distributing their attention more outside the control tower than the presumably less experienced ATCo.  A large number of fixations were not categorized bringing the method of dividing the ATCos eye-tracking view into areas of interest into question.

  • Fattahi, Sadegh
    et al.
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Månsson, Philip
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Computational and experimental study of fuel leakage through a ventilation valve during various driving conditions2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Fuel leakage through a fill limit vent valve (FLVV) inside a fuel tank is an important factor to consider during the design of a new tank. The performance of the carbon canister which absorbs the hydrocarbon can be compromised if fuel manages to escape through the valve, so called Liquid Carry Over (LCO) and thus not fulfilling the fuel emission requirements. As of today this is not thoroughly investigated using experiments nor Computational Fluid Dynamics.

    The main focus of this study was to develop a method to simulate the behaviour of the FLVV during various driving conditions at an early design stage and if this gives rise to fuel escaping through the FLVV. This method was later to be validated with an experimental set-up and later used to perform some simulations to investigate LCO by varying different parameters such as fuel level and different types of driving. What happens when the canister is purging was also investigated to see if it has a pronounced effect on LCO. Purging is when hydrocarbons, absorbed by the canister, are sent to the engine and giving rise to an under pressure in the tank.The method was developed to run on a cluster utilizing 200 Central Processing Unit Cores where each simulated physical second required an average of 3 hours of simulation time.The flow inside the tank was simulated using a Volume Of Fluid (VOF) multiphase model and the dynamic behaviour of the floater inside the FLVV was simulated using an overset mesh with a Dynamic Fluid Body Interaction.The movement of the simulated dynamic floater was validated with an experimental set-up specifically developed for the overset mesh validation and the motion of the floater was captured at a fairly accurate level.A prototype for an experimental tank was also developed and produced to validate the VOF set-up used for sloshing inside the tank which was utilized on the real tank but due to time limitation the experiments were not performed.

    The results from the parameter investigation showed that LCO was present in cases with high fuel level inside the tank 95 % and that an aggressive driving gives rise to a higher level of LCO compared to normal driving. Simulations with a fuel level of 85 % and lower showed no evidence of LCO for this particular tank model. The purging of the tank induced a pumping effect giving rise to a higher level of LCO pumped through by the floater.

  • Augustsson, Britt-Mari
    Linköping University, Department of Culture and Communication.
    Cecilia Edefalk genom postmodernismens raster2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay analyzes artworks by Cecilia Edefalk through a postmodernist lens. Three artworks - Another Movement, In the Painting the Painting, Selfportrait - from 1990s are examined regarding design and influence of postmodernist expressions. Through the method of discourse analysis the debate of art is investigated, as well as art critics regarding Edefalks artwork, at the time postmodernism developed in Sweden.

  • Grahn, Fredrik
    et al.
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Nilsson, Kristian
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Object Detection in Domain Specific Stereo-Analysed Satellite Images2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Given satellite images with accompanying pixel classifications and elevation data, we propose different solutions to object detection. The first method uses hierarchical clustering for segmentation and then employs different methods of classification. One of these classification methods used domain knowledge to classify objects while the other used Support Vector Machines. Additionally, a combination of three Support Vector Machines were used in a hierarchical structure which out-performed the regular Support Vector Machine method in most of the evaluation metrics. The second approach is more conventional with different types of Convolutional Neural Networks. A segmentation network was used as well as a few detection networks and different fusions between these. The Convolutional Neural Network approach proved to be the better of the two in terms of precision and recall but the clustering approach was not far behind. This work was done using a relatively small amount of data which potentially could have impacted the results of the Machine Learning models in a negative way.

  • Matthews, Felizia
    Linköping University, Department of Management and Engineering, Malmstens Linköping University.
    KÄNSELN SOM UTGÅNGSPUNKT: En sinnlig process i utformandet av en möbel för att förmedla sinnlighet till någon annan.2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    is thesis examines how the sense of touch can function as a method and a guide for meaning and expression in the designprocess. By studying selected theories that deal with topics such as the sensous system, color perception and form, I seek answers to how com- munication through materiality, color and expression of the body can shape my process and survey as a starting point in designing furniture. Furniture that engage a conversation about the e ect sensual so shapes has for our sense of embrace and relaxation.

    In this work I translate my theroretical research into my practical process and design, where I engage directly in the materials as a method for shaping my object. e goal is to activate my senses in the process, in order to eventually enrich someone else’s sensory ex- perience. It’s about thinking, feeling, doing, all at once. e study can be used in a discus- sion about the importance of the engagement of the senses and the power of intention in design. I argue that these aspects are important for an emotionally touching result.

  • Pettersson, Viktoria
    et al.
    Linköping University, Department of Management and Engineering, Machine Design.
    Magnusson, Malin
    Linköping University, Department of Management and Engineering, Machine Design.
    Efficiency and Automation in the Interface between Airframe Development and Production: A study to identify and reduce time-consuming activities with focus on the methodology of In-Process Part Definition2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis started as an initiative from one of the co-authors that previously worked at SAAB AB during summer 2018. During the summer she worked with the design process of In-process part Definition (IPPD) and an interest emerged for making it more efficient. The design process of IPPD (DPOI) is where a design article, designed in CATIA, become manufacturable and adapted for assembly. The DPOI can be seen as the interface between the department of Airframe development and Production at SAAB AB. The first step was to investigate the current DPOI and conduct a pre-study to find time-consuming activities. 

    The pre-study consisted of five interviews, an observational study and a time study were the aims was to collect employees' own opinions, approve a pre-defined workflow divided into twelve elements and find problem areas. Element 1.0-11.0 is tasks within the DPOI and element 12.0 is the first step in the review process called Checker. Element 4.0 and 8.0 were divided further into parallel activities where the operators in the time study performs either, e.g., E4.0 (macro) or E4.1 (manually). To find time-consuming activities a time study was performed. The authors of this thesis acted observers and clocked each element while three operators denoted A-C designed 24 IPPDs. The results from the time study showed that elements 1.0, 3.0, 4.1 and 7.0 were time-consuming and E4.1 had potential to become automated.

    The selection of 2-3 problems was carried out through two Weighted Sum Models (WSM) where criteria was defined and solutions was listed. Each solution was weighted to each criterion and got a total grade. The selected problems, based on the total grade, were: Documents and Combined macro. Documents and manuals for scenario 5, 6 and the entire design process of IPPD was developed to make new employees learning process more efficient. A draft macro for scenario 5 and new complete macros for scenario 1 and 6 was developed and used in the comparative study. The comparative study was conducted like the previous time study but instead the new developed macros was used to make E4.0 more efficient and eliminate E4.1. In the comparative study only E4.0 was clocked for all 24 IPPDs in the time study. The result showed that E4.0 has become average 60% more efficient for all IPPDs and the total time with the new developed macros for E4.0 vs E4.1 has become 14,3% more efficient. Problems and time-consuming activities has been found and improved. The performed comparative study shows that the DPOI can be minimized further in terms of time; there are possibilities to make more elements from the DPOI automated.

  • Schön, Sofia
    Linköping University, Department of Management and Engineering, Machine Design.
    Design Space Exploration for Structural Aircraft Components: A method for using topology optimization in concept development2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    When building aircrafts, structural components must be designed for high strength, low cost, and easy assembly.To meet these conditions structural components are often based upon previous designs, even if a new component is developed.Refining previous designs can be a good way of preserving knowledge but can also limit the exploration of new design concepts.

    Currently the design process for structural aircraft components at SAAB is managed by design engineers. The design engineer is responsible for ensuring the design meets requirements from several different disciplines such as structural analysis, manufacturing, tool design, and assembly.Therefore, the design engineer needs to have good communication with all disciplines and an effective flow of information.

    The previous design is refined, it is then reviewed and approved by adjacent disciplines.Reviewing designs is an iterative process, and when several disciplines are involved it quickly becomes time consuming.Any time the design is altered it has to be reviewed once more by all disciplines to ensure the change is acceptable.So there is a need for further customizing the design concept to decrease the number of iterations when reviewing.

    Design Space Exploration DSE is a well known method to explore design alternatives before implementation and is used to find new concepts.This thesis investigates if DSE can be used to facilitate the design process of structural aircraft components and if it can support the flow of information between different disciplines.To find a suitable discipline to connect with design a prestudy is conducted, investigating what information affect structural design and how it is managed.The information flow is concluded in a schematic diagram where structural analysis is chosen as additional discipline.

    By using topology optimization in a DSE, design and structural analysis are connected.The design space can be explored with regards to structural constraints.The thesis highlights the possibilities of using DSE with topology optimization for developing structural components and proposes a method for including it in the design process.

  • Public defence: 2019-09-27 10:15 Planck, Linköping
    Eriksson, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Molecular Surface Physics and Nano Science. Linköping University, Faculty of Science & Engineering.
    Cerium Oxide Nanoparticles and Gadolinium Integration: Synthesis, Characterization and Biomedical Applications2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    A challenging task, in the area of magnetic resonance imaging is to develop contrast enhancers with built-in antioxidant properties. Oxidative stress is considered to be involved in the onset and progression of several serious conditions such as Alzheimer’s and Parkinson’s disease, and the possibility to use cerium-contained nanoparticles to modulate such inflammatory response has gained a lot of interest lately. The rare earth element gadolinium is, due to its seven unpaired f-electrons and high symmetry of the electronic state, a powerful element for contrast enhancement in magnetic resonance imaging. Chelates based on gadolinium are the most commonly used contrast agents worldwide. When introducing external contrast agents there is always a risk that it may trigger inflammatory responses, why there is an urgent need for new, tailor-made contrast agents.

    Small sized cerium oxide nanoparticles have electronic structures that allows coexistence of oxidation states 3+ and 4+ of cerium, which correlates to applicable redox reactions in biomedicine. Such cerium oxide nanoparticles have recently shown to exhibit antioxidant properties both in vitro and in vivo, via the mechanisms involving enzyme mimicking activity.

    This PhD project is a comprehensive investigation of cerium oxide nanoparticles as scaffold materials for gadolinium integration. Gadolinium is well adopted into the crystal structure of cerium oxide, enabling the combination of diagnostic and therapeutic properties into a single nanoparticle. The main focus of this thesis project is to design cerium oxide nanoparticles with gadolinium integration. A stepwise approach was employed as follows: 1) synthesis with controlled integration of gadolinium, 2) material characterization by means of composition crystal structure, size, and size distribution and 3) surface modification for stabilization. The obtained nanoparticles exhibit remarkable antioxidant capability in vitro and in vivo. They deliver strongly enhanced contrast per gadolinium in magnetic resonance imaging, compared to commercially available contrast agents.

    A soft shell of dextran is introduced to encapsulate the cerium oxide nanoparticles with integrated gadolinium, which protects and stabilizes the hard core and to increases their biocompatibility. The dextran-coating is clearly shown to reduce formation of a protein corona and it improves the dispersibility of the nanoparticles in cell media. Functionalization strategies are currently being studied to endow these nanoparticles with specific tags for targeting purposes. This will enable guidance of the nanoparticles to a specific tissue, for high local magnetic resonance contrast complemented with properties for on-site reduced inflammation.

    In conclusion, our cerium oxide nanoparticles with integrated gadolinium, exhibit combined therapeutic and diagnostic, i.e. theragnostic capabilities. This type of nanomaterial is highly promising for applications in the field of biomedical imaging.

    List of papers
    1. Cerium oxide nanoparticles with antioxidant capabilities and gadolinium integration for MRI contrast enhancement
    Open this publication in new window or tab >>Cerium oxide nanoparticles with antioxidant capabilities and gadolinium integration for MRI contrast enhancement
    Show others...
    2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 6999Article in journal (Refereed) Published
    Abstract [en]

    The chelating gadolinium-complex is routinely used as magnetic resonance imaging (MRI) -contrast enhancer. However, several safety issues have recently been reported by FDA and PRAC. There is an urgent need for the next generation of safer MRI-contrast enhancers, with improved local contrast and targeting capabilities. Cerium oxide nanoparticles (CeNPs) are designed with fractions of up to 50% gadolinium to utilize the superior MRI-contrast properties of gadolinium. CeNPs are well-tolerated in vivo and have redox properties making them suitable for biomedical applications, for example scavenging purposes on the tissue-and cellular level and during tumor treatment to reduce in vivo inflammatory processes. Our near edge X-ray absorption fine structure (NEXAFS) studies show that implementation of gadolinium changes the initial co-existence of oxidation states Ce3+ and Ce4+ of cerium, thereby affecting the scavenging properties of the nanoparticles. Based on ab initio electronic structure calculations, we describe the most prominent spectral features for the respective oxidation states. The as-prepared gadolinium-implemented CeNPs are 3-5 nm in size, have r(1)-relaxivities between 7-13 mM(-1) s(-1) and show clear antioxidative properties, all of which means they are promising theranostic agents for use in future biomedical applications.

    Place, publisher, year, edition, pages
    Nature Publishing Group, 2018
    National Category
    Other Physics Topics
    Identifiers
    urn:nbn:se:liu:diva-147910 (URN)10.1038/s41598-018-25390-z (DOI)000431293100003 ()29725117 (PubMedID)2-s2.0-85046679522 (Scopus ID)
    Note

    Funding Agencies|Swedish Research Council [621-2013-5357]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; Knut and Alice Wallenberg Foundation [2012.0083 CTS 15:507]; Centre in Nano Science and Nano technology at LiTH (CeNano) at Linkoping University; CoTXS; Ministry of Education and Science of the Russian Federation [14.Y26.31.0005, K2-2017-080, 211]

    Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2019-08-29Bibliographically approved
  • Fredriksson Franzén, Måns
    et al.
    Linköping University, Department of Computer and Information Science.
    Sandberg, Kristoffer
    Linköping University, Department of Computer and Information Science.
    Beneficial Limitations: Rate caps for Enhanced Branched Video Streaming Experience2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The demand for on-demand video streaming has seen an enormous increased usage and is today the main contributor to Internet traffic. Technological developments combined with the accessibility of sufficiently powerful end-user hardware, large bandwidth capacities and significantly reduced storage cost are major contributors to this trend. We have built a simulation environment where multiple clients stream linear and branched video while competing over a shared bottleneck network. We examine how rate caps can be implemented to increase the overall Quality of Experience (QoE). First we present simulation results demonstrating the impact that rate caps have on clients playing linear video and compare and relate the results with prior work. Second we simulate the performance implementation of branched video and consider how its performance is affected by rate caps. Here, we highlight and discuss the trade-off patterns between playback quality and stability observed when a cap is implemented. To derive our conclusions we consider a range of scenarios, in which we vary different variables when a rate cap is set or not and measure the (i) requested encodings, (ii) buffer occupancy, and (iii) the amounts of switches between encodings made by the clients during the playback sequence. The rate cap implementation is shown to generate less switches between encodings, providing an enhanced stability and thus contributing to a better QoE in both the linear and branched environment.

  • Public defence: 2019-09-27 13:15 Ada Lovelace, Linköping
    Overkamp, Tim
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering.
    How Service Ideas Are Implemented: Ways of Framing and Addressing Service Transformation2019Doctoral thesis, monograph (Other academic)
    Abstract [en]

    As a field in practice and academia, service design is moving out of its formative phase. In service design research, the realisation of service transformation from idea to service practice and the ways that design(ers) can contribute to this process are topics that are not well understood yet. The work presented in this thesis contributes to improving this understanding.

    A programmatic design research approach was used to explore service transformation. This resulted in the formulation of two ways of framing and addressing the topic: type 1 service transformation, which frames the realisation of service transformation in terms of assembling a service delivery system, and type 2 service transformation, which views the realisation of service transformation as enabling value co-creating relationships between service actors.

    Type 1 service transformation builds on the assimilation perspective on service innovation where service transformation is realised by implementing service concepts. Service Design contributes to this by facilitating the development of desirable service experiences. Trained designers can apply implementation strategies and support the handover of service design projects to contribute to the realisation of type 1 service transformation by. Design for manufacture and assembly (DFMA) is a generative construct for addressing type 1 service transformation. DFMA is central to the program implementation during design, which was used to explore type 1 service transformation.

    Type 2 service transformation builds on the synthesis perspective on service innovation, which adopts a service-dominant logic. Service transformation is the shaping of value co-creating relationships between service actors and is realised by enabling service actors to enact roles that make the envisioned value co-creating relationships possible. Designing contributes by helping service developers to improve their understanding of value co-creating relationships and the way that realising service transformation is expected to affect those relations. Trained designers contribute by supporting this inquiry. The concept of roles, including Role Theory vocabulary, is a generative construct for addressing type 2 service transformation and is central to the program enabling enactment, which is suggested for the study of type 2 service transformation.

    The main contribution of this thesis is the articulation of these two perspectives on service transformation. The articulation of these two framings helps service developers and researchers in their efforts to study and work on the realisation of service transformation.

  • Lindholm, Lois
    Linköping University, Department of Culture and Communication.
    Hospitality Fostering Integration: Reassessing Hospitality in Migration Ethics2019Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis analyses the concept of hospitality in the context of migration ethics. The underlying philosophical ideas of Kant, Levinas and Derrida are outlined and critically discussed. The use of hospitality in migration ethics as mainly a concern within the political dimension of society, devalues the concept and neglects the social dimension of hospitality. I argue that migration ethics should be more concerned with integration and that it is more relevant to speak of hospitality in relation to integration rather than migration, since hospitality has to do with interpersonal interactions. In order to view hospitality in the social dimension of society, I present some cases of interpersonal hospitality practiced today. Drawing from those examples whilst using a virtue ethics approach, I consider three virtues that I deem to be prerequisites for hospitality: courage, humility and patience. Hospitality is a rich and multi-layered concept and practice. I conclude that one such layer is hospitality fostering integration. That is, hospitality functioning as social cohesion with a potential to bring different parts together as a whole.

  • Jenå, Hampus
    et al.
    Linköping University, Department of Management and Engineering, Commercial and Business Law. Linköping University, Faculty of Arts and Sciences.
    Skarberg, Gustav
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Engineering, Commercial and Business Law.
    Bolagsföreträdares betalningsansvar: En analys om ansvar och exculpering vid en missvisande kontrollbalansräkning2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Reglerna vid tvångslikvidation innebär att styrelsen vid misstanke om kritisk kapitalbrist ska upprätta en kontrollbalansräkning. Uppvisar kontrollbalansräkningen en faktisk kapitalbrist ska en kontrollstämma hållas för att besluta om kapitalbristen ska läkas eller låta bolaget träda i likvidation. Underlåter styrelsen att upprätta en kontrollbalansräkning kan ett personligt betalningsansvar utdömas för styrelseledamöterna. Underlåtenheten omfattar även om styrelseledamöterna tror att de har upprättat en kontrollbalansräkning men den visar sig vara missvisande. Kontrollbalansräkningen kan i sådant fall anses vara felaktig, vilket i resulterar i att den inte är upprättad. Ett personligt betalningsansvar kan även aktualiseras för andra bolagsföreträdare förutsatt att de har vetskap om styrelsens underlåtenhet. Vid avvikelse från reglerna i 25 kap. ABL kan även ett skadeståndsansvar enligt 29 kap. ABL bli aktuellt. När borgenären åberopar personligt betalningsansvar, åligger det den att visa faktisk kapitalbrist samt en ansvarsgrund i 25 kap. ABL. Bolagsföreträdaren kan undkomma det personliga betalningsansvaret om den kan visa att ingen försumlighet har förelegat. Det finns således möjlighet att exculpera sig från ansvaret enligt 25 kap. ABL, medan någon motsvarande exculperingsregel inte finns för skadeståndsansvaret enligt 29 kap. ABL. Trots att grunder för exculpering existerar, tycks restriktivitet råda för bolagsföreträdaren att kunna exculpera sig från det personliga betalningsansvaret. HD har i NJA 2012 s. 858 lämnat vägledning angående försumlighetsprövningen i 25 kap. ABL. Avgörandet har även kommenterats av Stefan Lindskog och Håkan Andersson, varpå de har diskuterat hur försumlighetsprövningen ska bedömas. Upprättandet av en kontrollbalansräkning är till stor del en värderingsfråga beroende av redovisningsrättsliga normer, vilka inbegriper ett utrymme för alternativa lösningar. Konsekvenserna, av en diskutabel försumlighetsprövning och en värderingsproblematik, är att rättsläget för såväl ansvarsfrågan som exculperingsfrågan är svårbedömda.

  • Ingo, Elisabeth
    Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
    Climbing up the hearing rehabilitation ladder2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Hearing impairment is a major public health problem, affecting communication and participation, and is associated with a range of health problems. Most individuals with perceived hearing impairment do not seek help, do not opt for rehabilitation (hearing aids), and do not use prescribed hearing aids adequately. Reducing the impact of hearing impairment and supporting healthy aging are important public health goals. Motivation, access to hearing health care, and poor societal awareness about hearing impairment, consequences, and rehabilitation options influence help-seeking. Offering online hearing screening has been proposed to improve hearing help-seeking, access to hearing health care, and to increase public knowledge about hearing and hearing impairment. Applying theories from health psychology (i.e. the Stages of change model) could help audiologists and other hearing health care professionals understand the psychological barriers that prevent people with hearing problems to seek help and take up rehabilitation. The overarching aim of this thesis was to investigate behaviors related to hearing rehabilitation (help-seeking, hearing aid uptake, and hearing aid use) in adults who fail an online hearing screening. A second aim was to explore the usefulness of the Stages of change model in predicting hearing rehabilitation related behavior in a self-selected online hearing screening sample. Studies I–IV show tentative support for offering online hearing screening and for supplementary interventions for increasing help-seeking and provide tentative support for Stages of change as a useful classification tool to indicate individual needs for further information and guidance. Future studies should contemplate integrating screening for multiple health-related factors associated with hearing impairment and to provide a clear and tailored pathway for each participant (e.g. referral to adequate health care or equivalent online intervention).

    List of papers
    1. Stages of change in audiology: comparison of three self-assessment measures
    Open this publication in new window or tab >>Stages of change in audiology: comparison of three self-assessment measures
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    2017 (English)In: International Journal of Audiology, ISSN 1499-2027, E-ISSN 1708-8186, Vol. 56, no 7, p. 516-520Article in journal (Refereed) Published
    Abstract [en]

    Objective: In a clinical setting, theories of health behaviour change could help audiologists and other hearing health care professionals understand the barriers that prevent people with hearing problems to seek audiological help. The transtheoretical (stages of change) model of health behaviour change is one of these theories. It describes a persons journey towards health behaviour change (e.g. seeking help or taking up rehabilitation) in separate stages: precontemplation, contemplation, preparation, action, and, finally, maintenance. A short self-assessment measure of stages of change may guide the clinician and facilitate first appointments. This article describes correlations between three stages of change measures of different lengths, one 24-item and two one-item. Design: Participants were recruited through an online hearing screening study. Adults who failed the speech-in-noise recognition screening test and who had never undergone a hearing aid fitting were invited to complete further questionnaires online, including the three stages of change measures. Study sample: In total, 224 adults completed the three measures. Results: A majority of the participants were categorised as being in one of the information- and help-seeking stage of change (contemplation or preparation). The three stages of change measures were significantly correlated. Conclusions Our results support further investigating the use of a one-item measure to determine stages of change in people with hearing impairment.

    Place, publisher, year, edition, pages
    TAYLOR & FRANCIS LTD, 2017
    Keywords
    Hearing screening; motivation; stages of change
    National Category
    Other Health Sciences
    Identifiers
    urn:nbn:se:liu:diva-139671 (URN)10.1080/14992027.2017.1309466 (DOI)000404938300009 ()28420270 (PubMedID)
    Note

    Funding Agencies|Swedish Council for Working Life and Social Research [2009-0055]

    Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2019-08-29Bibliographically approved
    2. Measuring motivation using the transtheoretical (stages of change) model: A follow-up study of people who failed an online hearing screening.
    Open this publication in new window or tab >>Measuring motivation using the transtheoretical (stages of change) model: A follow-up study of people who failed an online hearing screening.
    Show others...
    2016 (English)In: International Journal of Audiology, ISSN 1499-2027, E-ISSN 1708-8186, Vol. 55, no Suppl 3, p. S52-S58Article in journal (Refereed) Published
    Abstract [en]

    OBJECTIVE: Acceptance and readiness to seek professional help have shown to be important factors for favourable audiological rehabilitation outcomes. Theories from health psychology such as the transtheoretical (stages-of-change) model could help understand behavioural change in people with hearing impairment. In recent studies, the University of Rhode Island change assessment (URICA) has been found to have good predictive validity.

    DESIGN: In a previous study, 224 Swedish adults who had failed an online hearing screening completed URICA and two other measures of stages of change. This follow-up aimed to: (1) determine prevalence of help-seeking at a hearing clinic and hearing aid uptake, and (2) explore the predictive validity of the stages of change measures by a follow-up on the 224 participants who had failed a hearing screening 18 months previously.

    STUDY SAMPLE: A total of 122 people (54%) completed the follow-up online questionnaire, including the three measures and questions regarding experience with hearing help-seeking and hearing aid uptake.

    RESULTS: Since failing the online hearing screening, 61% of participants had sought help. A good predictive validity for a one-item measure of stages of change was reported.

    CONCLUSIONS: The Staging algorithm was the stages of change measure with the best ability to predict help-seeking 18 months later.

    Place, publisher, year, edition, pages
    Taylor & Francis, 2016
    National Category
    Psychology
    Identifiers
    urn:nbn:se:liu:diva-130826 (URN)10.1080/14992027.2016.1182650 (DOI)000381035200007 ()27206679 (PubMedID)
    Note

    Funding agencies: Swedish Council for Working Life and Social Research [2009-0055]

    Available from: 2016-08-26 Created: 2016-08-26 Last updated: 2019-08-29Bibliographically approved
  • Sestorp, Isak
    et al.
    Linköping University, Department of Computer and Information Science.
    Lehto, André
    Linköping University, Department of Computer and Information Science.
    CPDLC in Practice: A Dissection of the Controller Pilot Data Link Communication Security2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Controller-Pilot Data Link Communication, a technology that has been introduced to help offload the congested, previously used voice communication in larger airports, has in recent years started being questioned on its sufficiency in security. As the traffic load in air traffic communication keeps demanding more reliable and secure systems, we will in this thesis look at how widely CPDLC is actually used in practice in Europe. By using the newly introduced technology in software defined radios, we show that it is possible to capture and decode CPDLC messages to readable plain text. We furthermore discuss which type of attacks that could be possible with information retrieved from CPDLC communication.

  • Gade, Jan-Lucas
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
    Mechanical Properties of Arteries: Identification and Application2019Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this Licentiate of Engineering thesis, a method is proposed that identifies the mechanical properties of arteries in vivo. The mechanical properties of an artery are linked to the development of cardiovascular diseases. The possibility to identify the mechanical properties of an artery inside the human body could, thus, facilitate disease diagnostization, treatment and monitoring.

    Supplied with information obtainable in the clinic, typically limited to time- resolved pressure-radius measurement pairs, the proposed in vivo parameter identi- fication method calculates six representative parameters by solving a minimization problem. The artery is treated as a homogeneous, incompressible, residual stress- free, thin-walled tube consisting of an elastin dominated matrix with embedded collagen fibers referred to as the constitutive membrane model. To validate the in vivo parameter identification method, in silico arteries in the form of finite element models are created using published data for the human abdominal aorta. With these in silico arteries which serve as mock experiments with pre-defined material parameters and boundary conditions, in vivo-like pressure-radius data sets are generated. The mechanical properties of the in silico arteries are then determined using the proposed parameter identification method. By comparing the identified and the pre-defined parameters, the identification method is quantitatively validated. The parameters for the radius of the stress-free state and the material constant associated with elastin show high agreement in case of healthy arteries. Larger differences are obtained for the material constants associated with collagen, and the largest discrepancy occurs for the in situ axial prestretch. For arteries with a pathologically small elastin content, incorrect parameters are identified but the presence of a diseased artery is revealed by the parameter identification method.

    Furthermore, the identified parameters are used in the constitutive membrane model to predict the stress state of the artery in question. The stress state is thereby decomposed into an isotropic and an anisotropic component which are primarily associated with the elastin dominated matrix and the collagen fibers, respectively. In order to assess the accuracy of the predicted stress, it is compared to the known stress state of the in silico arteries.  The comparison of the predicted and the in silico decomposed stress states show a close agreement for arteries exhibiting a low transmural stress gradient. With increasing transmural stress gradient the agreement deteriorates.

    The proposed in vivo parameter identification method is capable of identifying adequate parameters and predicting the decomposed stress state reasonably well for healthy human abdominal aortas from in vivo-like data.

    List of papers
    1. An in vivo parameter identification method for arteries: numerical validation for the human abdominal aorta
    Open this publication in new window or tab >>An in vivo parameter identification method for arteries: numerical validation for the human abdominal aorta
    2019 (English)In: Computer Methods in Biomechanics and Biomedical Engineering, ISSN 1025-5842, E-ISSN 1476-8259, p. 426-441Article in journal (Refereed) Published
    Abstract [en]

    A method for identifying mechanical properties of arterial tissue in vivo is proposed in this paper and it is numerically validated for the human abdominal aorta. Supplied with pressure-radius data, the method determines six parameters representing relevant mechanical properties of an artery. In order to validate the method, 22 finite element arteries are created using published data for the human abdominal aorta. With these in silico abdominal aortas, which serve as mock experiments with exactly known material properties and boundary conditions, pressure-radius data sets are generated and the mechanical properties are identified using the proposed parameter identification method. By comparing the identified and pre-defined parameters, the method is quantitatively validated. For healthy abdominal aortas, the parameters show good agreement for the material constant associated with elastin and the radius of the stress-free state over a large range of values. Slightly larger discrepancies occur for the material constants associated with collagen, and the largest relative difference is obtained for the in situ axial prestretch. For pathological abdominal aortas incorrect parameters are identified, but the identification method reveals the presence of diseased aortas. The numerical validation indicates that the proposed parameter identification method is able to identify adequate parameters for healthy abdominal aortas and reveals pathological aortas from in vivo-like data.

    Place, publisher, year, edition, pages
    Taylor & Francis, 2019
    Keywords
    In vivo, parameter identification, abdominal aorta, in silico, finite element method, validation
    National Category
    Other Engineering and Technologies not elsewhere specified
    Identifiers
    urn:nbn:se:liu:diva-155056 (URN)10.1080/10255842.2018.1561878 (DOI)000466370800009 ()30806081 (PubMedID)2-s2.0-85062322494 (Scopus ID)
    Funder
    Swedish Research Council, 21-2014-4165
    Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-08-29Bibliographically approved
  • Söderström, Fredrik
    et al.
    Linköping University, Department of Management and Engineering, Information Systems. Linköping University, Faculty of Arts and Sciences.
    Melin, Ulf
    Linköping University, Department of Management and Engineering, Information Systems. Linköping University, Faculty of Arts and Sciences.
    Creating Local Government Innovation: Lessons Learned From An Institutional Theory Perspective2019In: Electronic Government: 18th IFIP WG 8.5 International Conference, EGOV 2019, San Benedetto Del Tronto, Italy, September 2–4, 2019, Proceedings / [ed] Lindgren, I., Janssen, M., Lee, H., Polini, A., Rodríguez Bolívar, M.P., Scholl, H.J., Tambouris, E, Cham: Springer, 2019, Vol. 11685, p. 125-138Conference paper (Refereed)
    Abstract [en]

    The public sector is facing an equation that cannot be solved by continuingdoing business as usual. External demands of availability, quality andresilience of services, as well as internal demands of resource efficiency, areputting pressure on the public sector to seek for innovation. In this study, wefocus on local government innovation where high expectations are set on betterutilisation of employees’ creativity and innovative capacity. Based on a qualitativecase study of an innovation programme in a Swedish local governmentorganisation, this study applies institutional theory as a theoretical lens tofurther investigate and analyse the relationship between formal and informalstructures of local government innovation. The institutional structures related tonorms and values, legitimacy and decoupling as well as digital artefacts as institutionalcarriers are discussed. Implications for practice show that formal structures,processes and digital artefacts to support local government innovation areimportant in this work. However, to achieve government innovation, equal attentionshould also be given to informal institutional structures of innovation.For research, this implies that government innovation studies can benefit froman institutional theory perspective to develop a better understanding of how informalstructures affect related processes. We conclude by arguing that theneeded change towards the innovative bureaucracy is a transformative innovationin itself that needs to be acknowledged.

  • Bock, Alexander
    et al.
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. University of Utah, USA.
    Axelsson, Emil
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.
    Costa, Jonathas
    New York University, USA.
    Payne, Gene
    University of Utah, USA.
    Acinapura, Micah
    American Museum of Natural History, USA.
    Trakinski, Vivian
    American Museum of Natural History, USA.
    Emmart, Carter
    American Museum of Natural History, USA.
    Silva, Cláudio
    New York University, USA.
    Hansen, Charles
    University of Utah, USA.
    Ynnerman, Anders
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. Linköping University, Center for Medical Image Science and Visualization (CMIV). University of Utah, USA.
    OpenSpace: A System for Astrographics2019In: IEEE Transactions on Visualization and Computer Graphics, ISSN 1077-2626, E-ISSN 1941-0506, p. 1-10Article in journal (Refereed)
    Abstract [en]

    Human knowledge about the cosmos is rapidly increasing as instruments and simulations are generating new data supporting the formation of theory and understanding of the vastness and complexity of the universe. OpenSpace is a software system that takes on the mission of providing an integrated view of all these sources of data and supports interactive exploration of the known universe from the millimeter scale showing instruments on spacecrafts to billions of light years when visualizing the early universe. The ambition is to support research in astronomy and space exploration, science communication at museums and in planetariums as well as bringing exploratory astrographics to the class room. There is a multitude of challenges that need to be met in reaching this goal such as the data variety, multiple spatio-temporal scales, collaboration capabilities, etc. Furthermore, the system has to be flexible and modular to enable rapid prototyping and inclusion of new research results or space mission data and thereby shorten the time from discovery to dissemination. To support the different use cases the system has to be hardware agnostic and support a range of platforms and interaction paradigms. In this paper we describe how OpenSpace meets these challenges in an open source effort that is paving the path for the next generation of interactive astrographics.

  • Shaaban, Sarah
    et al.
    Linköping University, Department of Management and Engineering.
    Magsi, Sumera
    Linköping University, Department of Management and Engineering.
    Digital business strategy: The driver for change in internal and external business environment2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Title: Digital business strategy - The driver for change in internal and external business environment

    Authors: Sumera Magsi and Sarah Shaaban

    Advisor: Andrea Fried

    Master thesis, 30 credits

    Background:The effects resulting from a more intense use of digital technologies in companies is visible in the integration between business and IT strategies which creates an urge for digital business strategies to emerge.

    Thesis aim: The aim is to investigate the current state of digital business strategies which includes highlighting benefits and challenges. By doing that we also are aiming towards answering, in what way ITBA can be questioned due to DBS.

    Methodology: A qualitative research based on a multiple case study by conducting semi- structured interviews. All the selected case companies are using digital business strategies as a part of their internal and external business environment (IEBE). The respondents have a role in the chosen case companies of being responsible for the implementation and use of strategies, digital business strategies and digital technologies.

    Findings: This study identifies that their exits a linkage between business strategy and ITBA. The main finding about the current state of DBS involves both internal and external DBS activities. Further findings show that benefit of digital business strategy to be the opportunity to levering costumers and challenges to be connected to the different IT maturity levels of the employees. The way that digital business strategy can question ITBA is based on that it is the driver for change for the case companies. 

  • Hedman, Kristofer
    et al.
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Department of Medicine, Stanford Cardiovascular Institute, Stanford, California, USA.
    Moneghetti, Kegan J.
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Stanford University, Stanford Sports Cardiology, Stanford, California, USA .
    Christle, Jeffrey W.
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Stanford University, Stanford Sports Cardiology, Stanford, California, USA.
    Bagherzadeh, Shadi P.
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Department of Medicine, Stanford Cardiovascular Institute, Stanford, California, USA .
    Amsallem, Myriam
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Department of Medicine, Stanford Cardiovascular Institute, Stanford, California, USA .
    Ashley, Euan
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Stanford University, Stanford Sports Cardiology, Stanford, California, USA.
    Froelicher, Victor
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Stanford University, Stanford Sports Cardiology, Stanford, California, USA.
    Haddad, Francois
    Department of Medicine, Division of Cardiovascular Medicine, Stanford, California, USA / Department of Medicine, Stanford Cardiovascular Institute, Stanford, California, USA.
    Blood pressure in athletic preparticipation evaluation and the implication for cardiac remodelling2019In: Heart, ISSN 1355-6037, E-ISSN 1468-201X, Vol. 105, no 16, p. 1223-1230Article in journal (Refereed)
    Abstract [en]

    Objectives To explore blood pressure (BP) in athletes at preparticipation evaluation (PPE) in the context of recently updated US and European hypertension guidelines, and to determine the relationship between BP and left ventricular (LV) remodelling.Methods In this retrospective study, athletes aged 13–35 years who underwent PPE facilitated by the Stanford Sports Cardiology programme were considered. Resting BP was measured in both arms; repeated once if >=140/90 mm Hg. Athletes with abnormal ECGs or known hypertension were excluded. BP was categorised per US/European hypertension guidelines. In a separate cohort of athletes undergoing routine PPE echocardiography, we explored the relationship between BP and LV remodelling (LV mass, mass/volume ratio, sphericity index) and LV function.Results In cohort 1 (n=2733, 65.5% male), 34.3% of athletes exceeded US hypertension thresholds. Male sex (B=3.17, p&lt;0.001), body mass index (BMI) (B=0.80, p&lt;0.001) and height (B=0.25, p&lt;0.001) were the strongest independent correlates of systolic BP. In the second cohort (n=304, ages 17–26), systolic BP was an independent correlate of LV mass/volume ratio (B=0.002, p=0.001). LV longitudinal strain was similar across BP categories, while higher BP was associated with slower early diastolic relaxation.Conclusion In a large contemporary cohort of athletes, one-third presented with BP levels above the current US guidelines’ thresholds for hypertension, highlighting that lowering the BP thresholds at PPE warrants careful consideration as well as efforts to standardise measurements. Higher systolic BP was associated with male sex, BMI and height and with LV remodelling and diastolic function, suggesting elevated BP in athletes during PPE may signify a clinically relevant condition.

  • Heurlin, Jasmine
    Linköping University, Department of Physics, Chemistry and Biology, Biology.
    Behavioral synchronization between dogs and owners.2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Dogs have lived with us for thousands of years, so we have learned to understand one another. Dogs have been shown to synchronize their behavior with humans. Behavioral synchronization is characterizes by doing the same thing at the same time and in the same place as someone else. This synchronization is often dependent on the relationship and the emotional state of the individuals. The main aim in this study was to develop a method to test behavioral synchronization and also to investigate how this, but also other behaviors, are effect by preceding human-dog interactions. Privately owned dogs (N=21) were tested with three different treatments (play, pet or ignore). The test procedure consisted of the owner walking or standing still in a predefined pattern, while their dog was freely roaming. This study showed that dogs adapted their movement pattern to their owners. This was similar to previous studies showing that the method developed can be used to test behavioral synchronization between owner and dog. Dogs explored the test arena less after play interaction and they also tended to seek more eye contact with their owners, but the interactions did not affect how much time spent in human proximity, how much they followed them or on dogs movement pattern.

  • Dahlstedt, Magnus
    et al.
    Linköping University, Department of Social and Welfare Studies, Social Work. Linköping University, Faculty of Arts and Sciences.
    Fejes, Andreas
    Linköping University, Department of Behavioural Sciences and Learning, Education and Adult Learning. Linköping University, Faculty of Educational Sciences.
    Gruber, Sabine
    Linköping University, Department of Social and Welfare Studies, Social Work. Linköping University, Faculty of Arts and Sciences.
    Folkbildning på svenska?: En studie av språkintroduktion för migranter i studieförbundet Sensus regi2019Report (Other academic)
    Abstract [sv]

    Människor har i alla tider migrerat. Rörlighet är historiskt sett regel snarare än undantag. En del människor migrerar för att söka jobb, andra för att följa sin stora kärlek. Men många har också tvingats fly från krig, naturkatastrofer, förföljelse och annan misär. Flykten är inte sällan kantad av svåra utmaningar. För en del blir flykten den sista resan. För andra slutar resan med plats på ett flyktingboende och lång väntan på asylbeslut. Asylprocessen är tärande. Livet står på paus. Medan vissa får beslut om att de får stanna tvingas andra återvända till de länder de flytt ifrån.

    Sverige 2019. Hösten 2015 hade Sverige den största invandringen sedan andra världskriget. Många människor sökte skydd från krig, förföljelse och mänskligt lidande. Välfärdssystemet sattes under press. Debattens vågor gick höga. Sverige byggde murar mot omvärlden. Migrationsverket som har uppdrag att erbjuda asylsökande en meningsfull vardag, fick allt mer uppenbara problem att fullfölja detta uppdrag. Det civila samhället mobiliserades runtom i landet till stöd för de nyanlända. Regeringen satsade stora riktade resurser till studieförbunden, som gavs i uppdrag att erbjuda asylsökande en introduktion till det svenska språket och det svenska samhället. Det är om just denna verksamhet som denna forskningsrapport handlar.

    Migration, lärande och social inkludering

    Denna rapport har sitt ursprung i dels ett flerårigt samarbete mellan Bildnings-förbundet Östergötland och forskningsmiljön Vuxenpedagogik och folkbildning (där också Mimer – nationellt program för folkbildningsforskning är förlagt) vid Institutionen för beteendevetenskap och lärande vid Linköpings universitet. Dels har studien sitt ursprung i lanseringen av forskningsprogrammet Migration, lärande och social inkludering, ett samarbete mellan de båda forskningsmiljöerna Vuxenpedagogik och folkbildning samt Socialt arbete, vid Institutionen för samhälls- och välfärdsstudier, båda vid Linköpings universitet.

    I forskningsprogrammet riktas intresset mot frågan om på vilket sätt olika sammanhang för vuxna och unga vuxnas studier i det svenska språket och om det svenska samhället bidrar till deras sociala inkludering. I forskningsprogrammet är det flera olika sammanhang som studeras: Studieförbundens verksamhet med Svenska från dag 1 och vardagssvenska, utbildning i svenska för invandrare och språkintroduktionsprogrammet på gymnasieskola och folkhögskola. Forskningsprogrammet har en longitudinell forskningsdesign. Vi vill å ena sidan studera Sensus verksamhet och övriga studiesammanhang var för sig, här och nu. Vad är det som händer? Hur bedrivs arbetet? Hur resonerar verksamhetsledare och cirkelledare om verksamheten och om deltagarna? Men vi vill framför allt rikta intresset mot deltagarna och den mening som de skapar kring sina studier, och hur detta meningsskapande kan relateras till deltagarnas historia, deras liv här och nu, men också till deras drömmar om framtiden. På så sätt vill vi alltså ge en ögonblicksbild av respektive verksamhet här och nu, och den roll som denna verksamhet spelar i migranternas liv i bredare bemärkelse.

    Men för att skapa en större förståelse för den roll som dessa verksamheter spelar för migranter i deras väg mot potentiell inkludering i det svenska samhället planerar vi dessutom att genomföra uppföljningsintervjuer med samma deltagare, både tre och sex år efter det att den första intervjun genomförts. Vid dessa intervjuer intresserar vi oss för hur deltagarna retrospektivt resonerar om sitt deltagande i till exempel Svenska från dag 1, och vilka andra studier, möten och händelser som tillskrivs värde i deras bana mot potentiell inkludering i det svenska samhället. Ambitionen är att nitialt, i de olika studiesammanhang intervjua sammanlagt 200 migranter. I dagsläget har totalt 150 migranter intervjuats.

    Forskningsprogrammets design gör det möjligt att skapa unik kunskap om migranters sociala inkluderingsbanor i det svenska samhället. Inte, som ofta är fallet, genom att med kvantifierbara mått mäta olika slags indikatorer på inkludering (etablering på arbetsmarknaden, löneutveckling med mera). Utan snarare genom att bidra med ”tjocka” berättelser och beskrivningar med grund i deltagarnas egna erfarenheter och meningsskapande. I slutskedet av programmet kommer resultat från de olika studiesammanhang som undersökts att jämföras med varandra. Tillskrivs något sammanhang större värde än något annat? I sådant fall, varför, och i vilka hänseenden? Det är vår förhoppning att den kunskap som forsknings-programmet bidrar med kommer att vara av stort värde inte bara för beslutsfattare och för de som arbetar med denna typ av verksamhet, utan även för de som faktiskt deltar i den.

    Finansiering och medverkan

    Den forskning som presenteras i denna rapport är samfinansierad av AMIF via Sensus och projekt #fokus, Bildningsförbundet Östergötland och Linköpings universitet. Ansvariga för arbetet, tillika det vidare forskningsprogram som denna rapport är del av, är professor Magnus Dahlstedt, Institutionen för samhälls- och välfärdsstudier, och professor Andreas Fejes, Institutionen för beteendevetenskap och lärande. De har designat studiens upplägg, ansvarat för etikprövning, samordning och bemanning, samt deltagit i bearbetning och analys av material och författande av denna rapport. Docent Sabine Gruber har ansvarat för data-insamlingen, och har tillsammans med Dahlstedt och Fejes genomfört bearbetning och analys av materialet och skrivit denna rapport.

    Magnus Dahlstedt, Andreas Fejes och Sabine Gruber

    Norrköping och Linköping, 16 augusti 2019

  • Stynsberg, John
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Incorporating Scene Depth in Discriminative Correlation Filters for Visual Tracking2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Visual tracking is a computer vision problem where the task is to follow a targetthrough a video sequence. Tracking has many important real-world applications in several fields such as autonomous vehicles and robot-vision. Since visual tracking does not assume any prior knowledge about the target, it faces different challenges such occlusion, appearance change, background clutter and scale change. In this thesis we try to improve the capabilities of tracking frameworks using discriminative correlation filters by incorporating scene depth information. We utilize scene depth information on three main levels. First, we use raw depth information to segment the target from its surroundings enabling occlusion detection and scale estimation. Second, we investigate different visual features calculated from depth data to decide which features are good at encoding geometric information available solely in depth data. Third, we investigate handling missing data in the depth maps using a modified version of the normalized convolution framework. Finally, we introduce a novel approach for parameter search using genetic algorithms to find the best hyperparameters for our tracking framework. Experiments show that depth data can be used to estimate scale changes and handle occlusions. In addition, visual features calculated from depth are more representative if they were combined with color features. It is also shown that utilizing normalized convolution improves the overall performance in some cases. Lastly, the usage of genetic algorithms for hyperparameter search leads to accuracy gains as well as some insights on the performance of different components within the framework.

  • Nord, Jonas
    et al.
    Linköping University, Department of Management and Engineering, Information Systems. Linköping University, Faculty of Arts and Sciences.
    Wåhlberg, Gabriel
    Linköping University, Department of Management and Engineering, Information Systems. Linköping University, Faculty of Arts and Sciences.
    Samhällsutmaningarnas lösning stavas Smart stad; hur påverkas den personliga integriteten?: En kvalitativ fallstudie om beslutsfattares inställning till och planer för personlig integritet i den smarta staden2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Swedish cities face challenges such as increased urbanisation, shifting demographics and demands on lowered environmental impact. The smart city may be considered part of the solution to these challenges. While there is no commonly accepted definition of the term “smart city” the term may be summarised as utilising digitalisation to increase a city’s efficiency. Digitalisation in the smart city enables efficiency and increases quality of life through the utilisation of algorithms, high speed internet, sensors and cheap digital storage. Large amounts of data may be processed in real time and used to assist in, or automate, decision making. Experts suggest that the smart city may negatively impact the privacy of visitors and citizens by aggregating and correlating processed personal data. Privacy is a central part of a healthy democracy, it enables societal change by allowing citizens to act outside existing societal norms and increases citizen wellbeing. Since the smart city is currently shaped by policy makers, an understanding of their attitudes towards the risks of the smart city infringing on citizen privacy provides insights into whether the smart city may poses an overall threat to citizen privacy. Another important factor to consider is the legal constraints within which the policy makers operate. This study explores the definition of the term “smart city”, its role in solving problems and the risks of it negatively impacting the integrity of citizens and visitors. While there is no consensus regarding the smart city’s definition, some common ground may be found in that it is enabled by technology. Instead of grappling with the implications of the smart city as a whole we found it appropriate to understand it by categorising and comprehending the initiatives which comprise the smart city, as well as their interactions, separately. The smart city’s role in society is to solve societal challenges and increase quality of life, decision makers don’t consider it important to define the smart city as a part of its development. Smart cities bring about a trade-off situation in which decision makers clearly favor efficiency over integrity, a stark contrast to the published papers in the field which hold integrity in a higher esteem. Despite the GDPR being a key regulation to consider when dealing with integrity in the smart city we found that decision makers are unaware of its application, scope or potential consequences for the development of the smart city.

    This study is conducted as a qualitative case study of the Stockholm smart city project and explores the project’s impact on privacy. The study is contextualised through the EU-regulation GDPR, national guidelines for integrity, the national program for smart cities and current research within smart cities, integrity and their intersection.

  • Linnell, Caroline
    Linköping University, Department of Management and Engineering, Malmstens Linköping University.
    Fake it til you make it?: En studie i alternativa fyllnadsmaterial för mindre fanerskador.2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    This is a study of alternative filling materials for smaller damages in veneer.

    The aim is to document and expand the palette of filling materials for furniture conservators and to create guidelines for the conservation and restoration of smaller damages in veneer.

    Parallel to this study I discuss other issues, such as the different values that can be found in an object. The importance of networking and the giving and sharing of information which is essential for the development of new techniques and materials. The difference between furniture conservation and furniture restoration is presented briefly.

    My tests are based on an analysis of the answers from my questionnaire where the respondents experience and practical skills serve as a partial base for the choice of materials that I have chosen to examine. My tests were executed on both birch and walnut veneer.

    I describe the pros and cons of traditional filling materials and in the conclusion, I present the filling materials that I believe can be a good complement to the traditional filling materials, such as Aquazol 500 and Arbocel.

  • Waldemarsson, Martin
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Planera massa med energi2019Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Med anledning av den senaste tidens uppvaknande kring klimatfrågans akuta läge har jakten på förnybara bränslen intensifierats. Hur och när den fossilbaserade ekonomin kommer överges åter-står att se, men mycket talar för att skogsindustrin med sina biobaserade energibärare kommer spela en fortsatt betydande roll, såväl i Sverige som i andra länder med mycket skog.

  • Löfgren, Håkan
    et al.
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Medicine and Health Sciences. Neuroorthoped Ctr, Sweden; Dept Radiol, Sweden.
    Osman, Aras
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Medicine and Health Sciences. Neuroorthoped Ctr, Sweden; Dept Radiol, Sweden.
    Blomqvist, Anders
    Linköping University, Department of Clinical and Experimental Medicine, Divison of Neurobiology. Linköping University, Faculty of Medicine and Health Sciences. Neuroorthoped Ctr, Sweden; Dept Radiol, Sweden.
    Vavruch, Ludek
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Medicine and Health Sciences. Neuroorthoped Ctr, Sweden; Dept Radiol, Sweden.
    Sagittal Alignment After Laminectomy Without Fusion as Treatment for Cervical Spondylotic Myelopathy: Follow-up of Minimum 4 Years Postoperatively2019In: Global Spine Journal, ISSN 2192-5682, E-ISSN 2192-5690, article id UNSP 2192568219858302Article in journal (Refereed)
    Abstract [en]

    Objectives:

    The aims of this study were to evaluate the incidence of sagittal malalignment including kyphosis following cervical laminectomy without fusion as treatment for cervical spondylotic myelopathy and to assess any correlation between malalignment and clinical outcome.

    Study Design:

    Retrospective cohort study.

    Methods:

    In all, 60 patients were followed up with conventional radiography at an average of 8 years postoperatively. The cervical lordosis (C2-C7 Cobb angle), C2-C7 sagittal vertical axis (cSVA) and C7 slope were measured on both preoperative and postoperative images. Patients completed a questionnaire covering Neck Disability Index (NDI), visual analogue scale for neck pain, and general health (EQ-5D).

    Results:

    Mean C2-C7 Cobb angle was 8.6° (SD 9.0) preoperatively, 3.4° (10.7) postoperatively and 9.6° (14.5) at follow-up. Ultimately, 3 patients showed >20° cervical kyphosis. Mean cSVA was 16.3 mm (SD 10.2) preoperatively, 20.6 mm (11.8) postoperatively, and 31.6 mm (11.8) at follow-up. Mean C7 slope was 20.4° (SD 8.9) preoperatively, 18.4° (9.4) postoperatively, and 32.6° (10.2) at follow-up. The preoperative to follow-up increase in cSVA and C7 slope was statistically significant (both P < .0001), but not for cervical lordosis. The preoperative to follow-up change in cSVA correlated moderately with preoperative cSVA (r = 0.43, P = .002), as did the corresponding findings regarding C7 slope (r = 0.52, P = .0001). A comparison of radiographic measurements with clinical outcome showed no strong correlations.

    Conclusions:

    No preoperative to follow-up change in cervical lordosis was found in this group; 5.0% developed >20° kyphosis. No clear correlation between sagittal alignment and clinical outcome was shown.

  • Wallin, Pontus
    et al.
    Skolforskningsinstitutet, Solna strand.
    Fejes, Andreas
    Linköping University, Department of Behavioural Sciences and Learning, Education and Adult Learning. Linköping University, Faculty of Educational Sciences.
    Hrastinski, Stefan
    Enheten för digitalt lärande, Kungliga tekniksa högskolan KTH, Stockholm.
    Nilsson, Staffan
    Institutionen för pedagogik och didaktik, Stockholms universitet.
    Individanpassad vuxenutbildning: Med fokus på digitala verktyg2019Report (Refereed)
    Abstract [sv]

    Skolforskningsinstitutet arbetar kontinuerligt med att ringa in undervisningsnära ämnesområden där behovet av vetenskapligt grundad kunskap bedöms vara stort. Det sker i dialog med verksamma i skolan, med representanter för myndigheter och or­ganisationer inom skolväsendet samt med forskare inom det utbildningsvetenskapliga fältet.

    Ett viktigt område som har identifierats under det arbetet gäller individanpassad undervisning inom vuxenutbildning. I behovsinventeringen framkom också att det finns behov av att sammanställa forskning om hur digitala verktyg används inom bland annat distansundervisning inom vuxenutbildning. Genom denna systematiska översikt vill vi sammanställa sådan forskning och göra den tillgänglig för lärare och andra verksamma inom komvux i Sverige.

    Översikten utgår ifrån följande övergripande frågeställningar:

    1. Vad kännetecknar individanpassad undervisning som möter vuxna elevers olikheter?
    2. Hur kan lärare använda digitala verktyg för att individanpassa undervisningen?

    Individanpassad undervisning inom vuxenutbildning

    Med individanpassad undervisning inom vuxenutbildning menar vi lärares metoder och arbetssätt som möter vuxna elevers olikheter i form av förutsättningar för lärande och behov i undervisningen. Vi har identifierat tre övergripande strategier för individanpassad undervisning:

    • gruppering

    • differentierad undervisning

    • individuell handledning.

    Gruppering innebär att elever delas in i grupper eller kurser utifrån deras förutsättning­ar och behov. Differentierad undervisning innebär att lärare tar hänsyn till elevers olikheter inom ramen för en kurs eller undervisningsgrupp. Individuell handledning innebär att elever ges individuellt stöd av läraren. I de studier som ingår i översikten relaterar forskarna oftast till någon eller några av dessa strategier för individanpassad undervisning.

    Resultat

    Det vetenskapliga underlaget består av 15 studier. Fyra av studierna har genomförts vid komvux i Sverige. Två studier har genomförts vid vuxenutbildning i övriga Skan­dinavien, vilken i hög utsträckning liknar komvux i Sverige. Ytterligare nio studier har genomförts i sammanhang som liknar komvux i Sverige men som också kan skilja sig något i fråga om hur utbildningen organiseras eller vilka elever som deltar.

    De ingående studierna skiljer sig i fråga om vilken forskningsmetod som använts. Även om studierna är av olika karaktär ger alla en förståelse för eller förklaringar till vad som kännetecknar individanpassad undervisning som möter vuxna elevers olikheter. En del av studierna kan dessutom beskriva eller förklara hur lärare kan använda digita­la verktyg för att individanpassa undervisningen.

    Undervisning som möter vuxna elevers olikheter

    Lärare har en nyckelroll i hur undervisningen utformas och genomförs. Men läraren är inte den enda som påverkar elevers lärande i en undervisningssituation. För den enskilda eleven kan andra elever också spela en viktig roll. Speciellt elever som har liten erfarenhet av studier kan vara beroende av att ta efter mer erfarna elever. Att imitera andra elever kan möjliggöra för elever med liten erfarenhet av utbildning att lära sig studieteknik och det sammanhang som undervisningsmiljön innebär. Lärare som vill individanpassa sin undervisning behöver överväga hur undervisningsmiljön möjlig­gör för elever att imitera andra elever för att på så sätt nå ett framgångsrikt lärande.

    Vuxna elever kan ha en mångfald av erfarenheter som lärare kan knyta an till i undervisningen. Genom att visa kunskap om och intresse för elevers tidigare erfaren­heter kan läraren bedriva en undervisning som är anpassad för den enskilda eleven. Genom en sådan undervisning kan en typ av resonans uppnås mellan elevens erfaren­heter och ämnesinnehållet i undervisningen. Eleven kan på så vis finna igenkänning i kunskapsinnehållet och engagemang för undervisningen.

    En undervisningsmiljö är också en plats för att skapa en gemensam kultur och en social arena som stimulerar till lärande. Betydelsen av interaktion och dialog mellan elever samt mellan elever och lärare ska inte underskattas vid skapandet av en miljö som gynnar elevers lärande. Det kan finnas elever som först behöver etablera relationer och interaktionsmönster i en undervisningsmiljö för att ett lärande ska bli möjligt.

    Att individanpassa undervisningen med hjälp av digitala verktyg

    Att introducera digitala verktyg i undervisningen kan påverka möjligheterna till individanpassning på olika sätt. Till digitala verktyg räknar vi teknisk utrustning, pro­gramvara och it-tjänster. Om digitala verktyg används för att genomföra exempelvis distansundervisning påverkas förutsättningarna för att individanpassa undervisningen på ett sätt som både innebär möjligheter och utmaningar. Ett exempel på möjlighet är att lärare på ett enkelt sätt kan förmedla ett omfattande kursmaterial till eleverna. Till utmaningarna hör bland annat att lärare kan få sämre överblick över vad eleverna gör och hur de lär sig.

    Vuxna elever har olika förutsättningar att tillgodogöra sig undervisning som sker med stöd av digitala verktyg. En lärare som är medveten om detta kan vara uppmärk­sam på om en elev har behov av extra hjälp och stöd. Lärare kan erbjuda elever olika sätt att studera för att kunna hitta ett upplägg som passar dem. För vissa elever kan exem­pelvis distansutbildning vara det bästa alternativet medan samma typ av distansutbild­ning bland annat kan innebära en förhöjd risk för avhopp för andra elever.

    Digitala verktyg kan fungera som ett komplement i och till klassrumsundervisningen. Digitala verktyg erbjuder lärare möjligheter att bland annat tillhandahålla in­spelade lektioner som elever vid behov kan ta del av vid upprepade tillfällen. Att påkalla lärarens uppmärksamhet i en klassrumssituation för att be om repetition kan upplevas som svårt av vissa elever. Med tillgång till inspelade lektioner kan elever med behov av repetition få ett extra stöd. En förutsättning är att eleverna har tillgång till och förmåga att använda digitala verktyg på avsett sätt.

    En god introduktion till digitala verktyg är viktigt. Samtliga elever kan behöva stöd för att kunna använda digitala verktyg för lärande. Med tydlighet kring verktygen för lärande kan eleverna ta ansvar för sin användning av verktygen, göra det som förväntas av dem och be om hjälp vid behov.

    Användning av resultaten

    Undervisningen inom skolväsendet i Sverige ska vila på vetenskaplig grund och be-prövad erfarenhet. Vidare ska vuxenutbildningen anpassas utifrån individens behov och förutsättningar. Därmed är lärare inom komvux ålagda att utforma och genom­föra en individanpassad undervisning som vilar på vetenskaplig grund och beprövad erfarenhet. Resultaten i den här systematiska översikten utgör en vetenskaplig grund för lärare att utgå ifrån. Men översikten visar också att det finns mycket mark kvar att bryta. Forskare har ett viktigt arbete framför sig med att förstärka den vetenskapliga grunden på området.

    Det finns aspekter av undervisningen som lärare inte kan råda över. Omfattningen av grupperingen av elever och resurser till individuell handledning kan vara på förhand givna. Men oavsett sådana förutsättningar kan lärare ta inspiration av forskningen som ingår i den här översikten. Resultaten från de vetenskapliga studierna ger lärare möjlighet att reflektera kring och utveckla sin undervisning. Forskningen ger inga tydliga svar på frågan om vad som är den bästa generella metoden för att bedriva en lyckad individanpassad undervisning som möter vuxna elevers olikheter. Existerande forskning på området kan bara ge exempel på vad som händer i en undervisningssituation i olika sammanhang med givna förutsättningar. Genom att inta ett vetenskapligt förhållningssätt bör lärare också vara kritiska till resultaten och själva avgöra hur exempel som lyfts i studierna relaterar till den egna undervisningssituationen.

    Urvalet av forskning

    Vi har gått igenom 16 845 sökträffar, varav 251 studier har granskats i fulltext. Av dessa bedömdes totalt 15 studier kunna bidra till att besvara den systematiska översiktens frågeställningar.

    Studierna som utgör underlag för översikten fokuserar på olika aspekter av un­dervisningen samt användningen av digitala verktyg inom ramen för undervisningen. Några studier undersöker vad elever inom vuxenutbildning har för förutsättningar för lärande. Sådana studier kan hjälpa till att beskriva och förklara grundförutsättningarna för lärares undervisning inom vuxenutbildning. I andra studier som ingår i översikten är syftet snarare att undersöka vad vuxna elever har för behov i sitt lärande. Dessa studier kan hjälpa lärare att identifiera vad de kan göra för att utforma individanpassad under-

    visning i specifika undervisningssituationer. Slutligen finns det artiklar i underlaget som utforskar och prövar olika metoder och arbetssätt som lärare använder för att individanpassa undervisningen för att möta elevers olikheter. Dessa studier kan ge lära­re vägledning för hur undervisningen kan utformas och genomföras. Endast ett fåtal studier undersöker vad undervisningen ger för effekter på elevers kunskapsresultat.

  • Hanses, Jonathan
    et al.
    Linköping University, Department of Electrical Engineering, Automatic Control.
    Eriksson, Morten
    Linköping University, Department of Electrical Engineering, Automatic Control.
    Modelling and Control of Heat Distribution in a Powder Bed Fusion 3D Printer2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis report describes how to improve the control of the temperature in a Powder Bed Fusion 3D printer. This is accomplished by first creating a model ofthe thermal system. To create a good model, both black-box and grey-box models of the system are estimated and compared. Based on the best model, different control designs are examined and the results are compared to find the control design yielding the best results.

    The system being modelled is a multiple input multiple output system with acomplex internal structure. The modelling can be divided into several steps. Firstly, data has to be acquired from the system. Secondly, the data is analysed and processed. Thirdly, models are estimated based on the collected data. Different model structures such as state-space, ARX, ARMAX, Output Error, Box Jenkins and grey-box models are examined and compared to each other. Finally, the different derived models are validated and it turns out the ARMAX model yields the best prediction capabilities. However, when the controllers were tested on the actual system the controllers that are based on the grey-box model yield the best results.

    The different control designs examined in this work are diagonal PI controllers, decoupled PI controllers, feed forward controllers, IMC controllers and statefeedback controllers. The controllers are all based on the derived models.

    The controllers are implemented into a code structure capable of communicating with the printers. Here, tests of the performance for the different controllers on the actual system are executed. The results show that a non-linear system can be controlled using linear controllers. However, introducing some fuzzy control elements such as limiting the controllers to only be used within small temperature intervals and using a fixed input outside this interval yield better results. From these results, the best linear controller is a diagonal PI controller tuned from a grey-box model with as many states as there are controllable areas of the powder bed. The improvement is only marginal compared to the original PI controller, reinforcing the conclusion that some non-linear strategies are needed in the controller in order to achieve significant improvements.

  • Russell, Jordan T.
    et al.
    Univ Florida, FL 32611 USA.
    Roesch, Luiz F. W.
    Univ Fed Pampa, Brazil.
    Ördberg, Malin
    Linköping University, Department of Clinical and Experimental Medicine, Division of Children's and Women's health. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center of Paediatrics and Gynaecology and Obstetrics, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus Linköping/Motala.
    Ilonen, Jorma
    Univ Turku, Finland; Turku Univ Hosp, Finland.
    Atkinson, Mark A.
    Univ Florida, FL 32610 USA.
    Schatz, Desmond A.
    Univ Florida, FL 32610 USA.
    Triplett, Eric W.
    Univ Florida, FL 32611 USA.
    Ludvigsson, Johnny
    Linköping University, Department of Clinical and Experimental Medicine, Division of Children's and Women's health. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center of Paediatrics and Gynaecology and Obstetrics, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus Linköping/Motala.
    Genetic risk for autoimmunity is associated with distinct changes in the human gut microbiome2019In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 3621Article in journal (Refereed)
    Abstract [en]

    Susceptibility to many human autoimmune diseases is under strong genetic control by class II human leukocyte antigen (HLA) allele combinations. These genes remain by far the greatest risk factors in the development of type 1 diabetes and celiac disease. Despite this, little is known about HLA influences on the composition of the human gut microbiome, a potential source of environmental influence on disease. Here, using a general population cohort from the All Babies in Southeast Sweden study, we report that genetic risk for developing type 1 diabetes autoimmunity is associated with distinct changes in the gut microbiome. Both the core microbiome and beta diversity differ with HLA risk group and genotype. In addition, protective HLA haplotypes are associated with bacterial genera Intestinibacter and Romboutsia. Thus, general population cohorts are valuable in identifying potential environmental triggers or protective factors for autoimmune diseases that may otherwise be masked by strong genetic control.

  • Hätty, Niklas
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Representing attacks in a cyber range2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Trained security experts can be a mitigating factor to sophisticated cyberattacks that aim to violate the confidentiality, integrity, and availability of information. Reproducible sessions in a safe training environment is an effective way of increasing the excellence of security experts. One approach to achieving this is by using cyber ranges, which essentially is a set of hardware nodes that can virtually represent a large organization or system. The Swedish Defense Research Agency (FOI) develops and maintains a fully functioning cyber range and has the ability to automatically deploy sophisticated attacks against organizations and systems represented in this cyber range through a system called SVED.

    In this thesis, the capability to deploy different types of cyberattacks through SVED against virtual organizations in a cyber range, CRATE, is investigated. This is done by building a dataset of publicly disclosed security incidents from a database and attempting to represent each of them in SVED, and subsequently instantiating these attack representations against organizations in CRATE.

    The results show that the prevalence of at least one CVE-entry (Common Vulnerabilities and Exposures) in the incident description is a key factor to be able to represent an attack in SVED. When such an entry does exist, SVED is likely able to implement a representation of the attack. However, for certain type of attacks a CVE-entry is not enough to determine how an attack was carried out, which is why some attacks are harder to implement in SVED. This was the case for Denial of Service (DoS) attacks, which are too reliant on infrastructure rather than one or more vulnerabilities, and SQL injections, which are more reliant on the implementation of database access.

    Finally, CRATE is able to handle almost all attacks implemented in SVED, given that the correct vulnerable application software is installed on at least one machine in one of the organizations in CRATE.

  • Nordström, Anna
    Linköping University, Department of Management and Engineering.
    Kommuners insatser för att främja elevnärvaro i grundskolan: en studie om två kommuners styrning ur ett organisationsteoretiskt perspektiv2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Even though it is prescribed by law in Sweden that children in elementary school must fulfil a compulsory education, a significant number of students are absent. The aim of this thesis is therefore to analyse two municipalities’, Halmstad and Borås, efforts to improve student attendance in elementary school. The two municipalities are of middle size with approximately the same number of citizens and elementary schools. Both municipalities, that have large autonomy, have recently developed new policies regarding how schools should manage absence in elementary school. By studying these policies and interviewing responsible authorities, principals and representatives from student health care, the goal is to find out what governance models characterize the municipalities’ efforts to promote attendance in school. The methods used are of a qualitative character and the interviews semi-structured. The theoretical framework concentrates on organization theory, such as management models, instrumental, mythical and culture perspectives and evaluation.

     

    The results found show that the management model is strongly dominating the governance within the educational system. However, the practical methods used to promote school attendance depend in wide measures on experience and values among the actors working with the students, indicating a cultural perspective. Since the management model is dominating the governance of the school system, and this model highlights public servants’ acting space, the actors’ values and interpretations become important factors for the outcome.

  • Dalgren, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Lundegård, Ylva
    Linköping University, Department of Computer and Information Science.
    GreenML: A methodology for fair evaluation of machine learning algorithms with respect to resource consumption2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Impressive results can be achieved when stacking deep neural networks hierarchies together. Several machine learning papers claim state-of-the-art results when evaluating their models with different accuracy metrics. However, these models come at a cost, which is rarely taken into consideration. This thesis aims to shed light on the resource consumption of machine learning algorithms, and therefore, five efficiency metrics are proposed. These should be used for evaluating machine learning models, taking accuracy, model size, and time and energy consumption for both training and inference into account. These metrics are intended to allow for a fairer evaluation of machine learning models, not only looking at accuracy. This thesis presents an example of how these metrics can be used by applying them to both text and image classification tasks using the algorithms SVM, MLP, and CNN.

  • Kaharevic, Ahmed
    Linköping University, Department of Management and Engineering, Political Science. 1995.
    Imagining the Iraqi National Identity Before and After the US Invasion of 2003: Perception of the Sunni-Arab ethnicity2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This masters thesis analyses how Iraqi national identity is constructed before and after 2003. It explores what relation the national identity has to Sunni-Arab ethnicity.

    The study is qualitative and uses social constructivism as a methodological outline. Qualitative interviews are done with six Iraqi-Arab-Sunnis living in Sweden. Diaspora is not an analytical scope. The theoretical framework consists of Benedict Anderson’s theory about nations and nationalism where imagined communities is a key concept. Furthermore, Thomas Hylland Eriksen’s theory about ethnicity and nationalism where social identification is a central concept.

    Drawn conclusions are that Iraqi nationalism, partly constructed by Sunni hegemony, is the main identification and what the community is imagined from. Sunni ethnicity is mostly rejected, and a Sunni community barely exists. Unlike previous research which argues that Sunnis have redefined themselves through Sunni ethnicity. Iraqi nationalism is constructed against the anomaly which is other nations Iran and the US. It is also constructed by idealizing and remembering the past from a nationalistic perspective. It is constructed as kinship, as equal and with pride. However, the Sunni hegemony implies that Iraqi nationalism is not equal but privileges Sunni ethnicity. Sunni ethnicity is barely visible, but mostly post 2003 through victimhood. Sunni ethnicity was under communicated before 2003 but is over communicated after 2003, especially amongst national institutions. An exclusion of Sunni ethnicity occurs amongst national institutions post 2003.

  • Ask, Tova
    Linköping University, Department of Management and Engineering, Political Science.
    Identitet mellan raderna: –       En studie om hur amerikanska tidningar beskriver den nationella identiteten i USA2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Under the latest presidential election in the USA debates of the national identity was one of the central topics, which have made the polarization between the parties wider. Today we know that people choose the media that sympathies with their opinion and turn from the media that challenge their political believes. By studying newspapers one can examine what they say about national identity and membership, which in turn shows which groups are represented in society. By using membership as a theory, the study gives a new theoretical approach and see if membership theory can describe how the American identity is described in newspapers. The study will analyze six American newspapers and ten articles per paper, in total of 60 articles. The method is describing analysis of ideas, which will be used to clarify and analyze how the newspapers are describing membership. All the newspapers are analyzed separately and, in the end, a comparative analysis between the papers is made. There are three major conclusions to been drawn. The first one shows a divided identity in USA, but all the papers have the same solution, it is the governments task to fix and restore the national identity. The second conclusion shows how divided the newspapers are from their ideological undertone from different points of views of membership. The third conclusion shows that all newspapers describe membership in different ways. 

  • Janse Ferko, Saga
    et al.
    Linköping University, Department of Management and Engineering.
    Porttila Jenny, Peter
    Linköping University, Department of Management and Engineering.
    Rasisten mitt i klassrummet: En systematisk litteraturstudie av lärares förståelse av och förhållningssätt till rasism i skolan2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Skolan är en av få institutioner som alla medborgare är tvungna att befinna sig i. Samtidigt framstår det som att skolan inte alltid lyckas med uppdraget att ge alla elever en likvärdig utbildning. Rasifierade barn och unga verkar möta en rad hinder och missgynnas systematisk under sin utbildningstid. Syftet med den här uppsatsen är att undersöka vilka hinder och dilemman det finns för lärare att hantera rasism i skolan samt att undersöka hur rasism kan förstås i en skolkontext. Fokus har varit att förstå lärares roller och förhållningssätt kopplat till rasism i skolan. Uppsatsen är genomförd som en systematisk litteraturstudie och utgår från sex internationellt publicerade artiklar och en svensk avhandling som sorteras med hjälp av tematisk innehållsanalys utifrån tre olika teman. Dessa tre teman, tillika perspektiv; det socialkonstruktivistiska, det utbildningssociologiska och det svenska perspektivet, ger sammantaget en mer mångfacetterad bild av hur problemet kan förstås.

    Resultatet visar att det kan uppstå svårigheter i att hantera rasism eftersom den ofta verkar i det dolda och kan vara svår att identifiera. Trots goda ambitioner om lika behandling verkar det dessutom som att lärare inte alltid lyckas med dessa uttalade målsättningar. Det grundar sig framförallt i en bristande förståelse för rasism som någonting större än direkt kränkande handlingar. Vi har funnit att lärare behöver en ökad kunskap om vilka uttrycksformer som rasism kan ta sig samt vilka konsekvenser den kan få, såväl på kort som lång sikt. Vi har även funnit att språkbruket har en viktig roll för hur rasism reproduceras, där de till synes vanliga interaktionerna döljer nedtryckande och sorterande strukturer.

  • Vrethem, Anders
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Prestandaoptimering av hybrida mobilapplikationer: En kvalitativ studie2019Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Lately, as the market for mobile applications are growing there has appeared new innovative strategies that facilitates development of mobile applications for smartphones. One of those methods is hybrid development, the method has a tradeoff with performance, especially for older devices. Effects on performance is crucial when choosing development strategy. This study evaluates performance in terms of application launch time, and how it can be optimized. Performance is evaluated by performing real device test with a cloud service that provides a distribution of physical smartphone devices.