liu.seSearch for publications in DiVA
1234 1 - 50 of 194
rss atomLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
  • Mo Eriksson, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Hjort, Cian
    Linköping University, Department of Computer and Information Science.
    Uusitalo, August
    Linköping University, Department of Computer and Information Science.
    Kvist, Gustav
    Linköping University, Department of Computer and Information Science.
    Ringman, Noak
    Linköping University, Department of Computer and Information Science.
    Dalgren, Anton
    Linköping University, Department of Computer and Information Science.
    Ramström, Seth
    Linköping University, Department of Computer and Information Science.
    Larsson Alm, Kevin
    Linköping University, Department of Computer and Information Science.
    Simulering i Virtual Reality för prestations- och motivationsförbättring2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report processes the software development project created by the project group SurVive during the spring semester of 2017 at Linköping University. The project involved in the purpose of research, construct a virtual environment in order to allow students to practice demanding situations. The report aims to discuss and analyze virtual realitys applicability on performance enhancement and the development of the virtual environment.

    The system that has been developed will provide a safe and secure environment for the users to practice their presentations. In addition, relevant user data will be illustrated on a website to provide feedback on their performances. Whether the developed system really contributes to enhanced performance, requires further research.

  • Nilsson, Emil
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Lindman, Tommy
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Implementation and evaluation of Bluetooth Low Energy as a communication technology for wireless sensor networks2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    As the growth and enthusiasm for IoT increases, energy consumption and efficiency is of immense importance in order to develop maintainable and dependable sensor networks. In this thesis, we implement and evaluate a wireless sensor network using Bluetooth Low Energy (BLE) as the communication standard with regards to energy consumption and range capabilities. We found BLE to be a highly viable option for such systems, yielding long battery life for systems where long-range capabilities are not needed.

  • Karlsson, Tobias
    Linköping University, Department of Computer and Information Science.
    Visuell framställningseffekt inom digital tv-miljö2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Abstract

    För interaktiv tv-reklam är det viktigt att undvika störande intryck samtidigt som man önskar att få användaren engagerad. För detta ändamål undersöktes den visuella framställningseffekten, som enligt Elder och Krishna (2012) leder till ökat engagemang för den produkt som presenteras, vilket leder till ökade köpintentioner. Specifikt undersöktes om den visuella framställningseffekten leder till en ökad mental simulering och om detta påverkar köpintentioner och attityd. Studien undersökte även om handanvändande påverkade mental simulering i samband med den visuella framställningseffekten. Studien var en inomgruppsdesign med 29 deltagare och analysen utfördes med en Two-Way Repeated Measures ANOVA. Med signifikans p<0.01 styrktes hypotesen att den visuella framställningseffekten för bilder i ett interaktivt tv-gränssnitt påverkar mental simulering och därmed kan påverka engagemang hos användare. Övriga hypoteser förkastades. Studien indikerar att den visuella framställningen av reklam bör utformas så att den bjuder in användaren och därmed får den mer engagerad. Detta kunde dock inte kopplas med ökade köpintentioner.

  • Lundström, Dennis
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Data-efficient Transfer Learning with Pre-trained Networks2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Deep learning has dominated the computer vision field since 2012, but a common criticism of deep learning methods is their dependence on large amounts of data. To combat this criticism research into data-efficient deep learning is growing. The foremost success in data-efficient deep learning is transfer learning with networks pre-trained on the ImageNet dataset. Pre-trained networks have achieved state-of-the-art performance on many tasks. We consider the pre-trained network method for a new task where we have to collect the data. We hypothesize that the data efficiency of pre-trained networks can be improved through informed data collection. After exhaustive experiments on CaffeNet and VGG16, we conclude that the data efficiency indeed can be improved. Furthermore, we investigate an alternative approach to data-efficient learning, namely adding domain knowledge in the form of a spatial transformer to the pre-trained networks. We find that spatial transformers are difficult to train and seem to not improve data efficiency.

  • Blochel, Amanda
    Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, Faculty of Science & Engineering.
    The Future of Advanced Bio-Jet Fuel2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The aviation industry is growing rapidly and the carbon dioxide emissions from the industry are following in the same manner. Biofuels made from edible feedstock have had an impact on lowering the emissions but at the same time an impact on increasing food prices. There are a few alternative fuels on the market today (TF-SPK, HEFA-SPK) which work in a blend with the petroleum based fuels, reducing the emissions from the aircrafts. Biofuels from next generation biomass, also called advanced biomass, such as algae and lignin, seem likely to be a good substitute for the first generation biofuels. The advanced biofuels are relatively costly to produce. This is due to the many steps in the production process, which restricts the usage of these sorts of fuels in the aviation industry. There are some problems associated with a jet fuel produced from 100% biomass. This is because the jet fuel produced from biomass differs from the jet fuels used today, making it unsafe to use in modern day airplane engines. That is why it is important to find an alternative jet fuel based on biomass that has the same characteristics as the conventional jet fuel, to be able to use the same transportation and engines that are in use today. Otherwise the high cost of advanced bio-jet fuels will make them unusable.

  • Karlsson, Jonas
    Linköping University, Department of Physics, Chemistry and Biology, Biotechnology.
    Modeling and simulation of existing biogas plants with SIMBA#Biogas2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The main purpose of this project was an attempt to modulate and simulate two existing biogas plant, situated in Lidköping and Katrineholm, Sweden and evaluate how the process reacts to certain conditions regarding feeding, layout and substrate mixture. The main goal was to optimize the existing processes to better performance. Both the modeling and simulation were executed in SIMBA#Biogas with accordance to the real conditions at the plant in question. The simulation of each model was validated against data containing measurements of, CH4 yield, CH4 production, TS, VS, NH4-N concentration and N-total concentration. The data was obtained from each plant in accordance with scheduled follow ups. Both models were statistically validated for several predictions. Predictions of N-total and NH4-N concentration failed for some cases. Both plants were tested with new process lay outs, where promising results were obtained. The Lidköping model was provided with a post-hygienization step to handle ABPs. The Katrineholm model was provided with a dewatering unit, where 35% of the centrate was recirculated back to the system. Both setups was configured to yield the highest CH4 production. This study suggests that SIMBA#Biogas can be a tool for predictions and optimizations of the biogas process.

  • Anderberg, Elin
    Linköping University, Department of Physics, Chemistry and Biology.
    LED Array Frequency Dependent Photocurrent Imaging of Organic Solar Cell Modules2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    To mitigate the risk for devastating climate changes, there is an urgent need to change the energy production from the current fossil based to renewable sources. Solar cells will contribute to an increasing share of the future energy systems. Today silicon solar cells dominate the market but printed organic solar cells are promising alternatives in terms of cost, flexibility, possibilities for building integrations and energy payback times. Printing enables roll-to-roll processing that is quick and renders huge volumes. Thus, also characterization and quality control must be fast. Recent tests have been performed showing that a LED array with amplitude modulated LEDs can be used to provide photocurrent images of modules with series connected sub cells in-line during manufacturing. The purpose of this thesis work is to further evaluate and develop this LED array characterization technique focusing on contact methods and signal interpretation. Two modes were examined; a contact mode and a capacitive contact-less mode. Both modes gave comparable results and indicated strong variations in performance of sub cells in the measured modules. Other methods to address individual cells also showed similar behavior. However, by manually adding extra contact points, current-voltage curves could be measured on the individual sub cells in the modules. Extraction of photocurrents were similar, but the parallel resistances varied strongly between the cells in the module. Increasing the frequency of the LEDs resulted in less variations. Calculations indicated that this frequency dependence could be used to separate the photocurrent generation and parallel resistance in the sub cells.

  • Granberg Lomyr, Mikaela
    Linköping University, Department of Management and Engineering, Environmental Technology and Management.
    Urban mining i praktiken: Hur kan återvinning av markförlagda kablar integreras i infrastrukturs-planeringen och vilka kostnadsposter kan användas vid projektbererdning2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    För att hantera den ökande befolkningen i världen behöver jordens resurser användas mer effekt vilket till exempel kan göras genom att återvinna material som inte längre fyller någon funktion. Området Urban mining handlar om att frigöra material som inte längre används i den urbana miljön och göra dem tillgängliga för nya produkter. I Sverige förläggs olika typer av infrastruktursystem i marken och när de inte längre används får de vanligtvis ligga kvar. Resursbasen som bland annat urkopplade elkablar utgör har identifierats i tidigare studier som intressant att ta upp i samband med markingrepp, då de innehåller värdefulla metaller. Att förädla malm till ren metall är dessutom mer kostsamt, ur både ekonomiskt och miljömässigt perspektiv, än att återvinna produkter som inte längre används.Studien har omfattat intervjuer med elnätsägaren i Linköping om hur beslut fattas kring elnätets förvaltning samt en praktisk pilotstudie i utvecklingsorten Vikingstad. Personer på olika strategisk nivå intervjuades och styrande dokument som ägardirektiv för verksamheten granskades. Därefter identifierades möjligheter och hinder för att kabelupptagning ska ske i större utsträckning än idag samt vart i den strategiska processen frågan behöver integreras. I Vikingstad var planen att både förnya och förstärka elnätet på sträckor där kablar som skulle kopplas ur låg. Under pilotstudien undersöktes vilka extra moment som upptagningen krävde, vad momenten innebar för kostnader, vilken tid de tog samt vilka intäkter som kabelskrotet genererade.Elnätsägarna regleras av energimarknasinspektionens intäktsram och branchorganisationen Svensk energi har en central roll för ökad och spridd kunskap hos Sveriges elnätsägare. Dessa två intressenter har därför viktiga roller i ställningstagandet om huruvida urkopplade elnätskablar ska tas upp eller ej. Hos elnätsägaren i Linköping är det när beslut tas om vilka förstärknings- eller förnyelseprojekt som ska genomföras som möjligheten till integrering av upptagning av urkopplade kablar bör undersökas. Detta då fallspecifika parametrar som fördelaktig ny sträckning och omkopplingsmöjligheter är avgörande för genomförbarheten. Resultatet från pilotstudien visar att fyra typer av moment är nödvändiga för att ta upp urkopplade kablar: ”schaktning och friläggning”, ”lyfta upp kabel ur schakt”, ”samla ihop kabel och kabelband” samt ”återställning”. Av dessa moment påverkar ”schaktning och friläggning” kostnaderna mest om extra djup krävs och ”lyfta upp kabel ur schakt” är mest kostsamt om det finns många andra system kring kabeln som ska tas upp. Det ekonomiska resultatet visar att tre procent av kostnaderna på sträckorna där kablar togs upp kan allokeras till upptagningen.Slutligen konstateras att fördelar som ökad miljöprestanda och frigjord plats för nya system i marken bör beaktas i större utsträckning hos elnätsägaren. Kostnader och intäkter kan också styras om för att motivera elnätsägarna mer, då upptagningen i dagsläget medför ökade kostnader för dem. För att underlätta budgetering av förstärknings- eller förnyelseprojekt med integrerad kabelupptagning presenteras kostnadsposter för de sammanslagna momenten upptagningen innebär, baserade på olika grundförutsättningar. Exempel på framtida studier för att öka kunskapen om och möjligheterna att ta upp urkopplade kablar är fler pilotstudier för att erhålla ett mer generaliserbart dataunderlag samt att undersöka hur ekonomiska värden av kabelupptagning kan fördelas mer fördelaktigt för elnätsägarna.

  • Ohlsson, Pontus
    Linköping University, Department of Computer and Information Science.
    Interacting with TV: A Usability Evaluation of the User Experience of a TV UI2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    During the last decade the TV industry has evolved with a larger array of distributed content such as streaming services. To supply these services, today's Smart TVs are delivered with pre-installed user interfaces. In order for these to work well and attract users to further viewing, the user experience is essential. The aim of this study was to evaluate the user experience of a TV client to find and analyze potential usability issues. By conducting usability evaluation tests with the utilization of eye-tracking, retrospective verbal protocol and interviews, multiple usability issues as well as positive aspects were found. Trough categorization, grading using severity rating and utilization of gaze paths with eye-tracking, possible sources of usability issues were unveiled. These included some inconsistency in the product, obscurities in navigation, terminology and functionality, and some lack of functionality. Based on the results of the study, a list of possible improvements were compiled together with visual sketches of its implementation.

  • Lannerhed, Petter
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Structural Diagnosis Implementation of Dymola Models using Matlab Fault Diagnosis Toolbox2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Models are of great interest in many fields of engineering as they enable prediction of a systems behaviour, given an initial mode of the system. However, in the field of model-based diagnosis the models are used in a reverse manner, as they are combined with the observations of the systems behaviour in order to estimate the system mode. This thesis describes computation of diagnostic systems based on models implemented in Dymola. Dymola is a program that uses the language Modelica. The Dymola models are translated to Matlab, where an application called Fault Diagnosis Toolbox, FDT is applied. The FDT has functionality for pinpointing minimal overdetermined sets of equations, MSOs, which is developed further in this thesis. It is shown that the implemented algorithm has exponential time complexity with regards to what level the system is overdetermined,also known as the degree of redundancy. The MSOs are used to generate residuals, which are functions that are equal to zero given that the system is fault-free. Residual generation in Dymola is added to the original methods of the FDT andthe results of the Dymola methods are compared to the original FDT methods, when given identical data. Based on these tests it is concluded that adding the Dymola methods to the FDT results in higher accuracy, as well as a new way tocompute optimal observer gain. The FDT methods are applied to 2 models, one model is based on a system ofJAS 39 Gripen; SECS, which stands for Secondary Enviromental Control System. Also, applications are made on a simpler model; a Two Tank System. It is validated that the computational properties of the developed methods in Dymolaand Matlab differs and that it therefore exists benefits of adding the Dymola implementations to the current FDT methods. Furthermore, the investigation of the potential isolability based on the current setup of sensors in SECS shows that full isolability is achievable by adding 2 mass flow sensors, and that the isolability is not limited by causality constraints. One of the found MSOs is solvable in Dymola when given data from a fault-free simulation. However, if the simulation is not fault-free, the same MSO results in a singular equation system. By utilizing MSOs that had no reaction to any modelled faults, certain non-monitored faults is isolated from the monitored ones and therefore the risk of false alarms is reduced. Some residuals are generated as observers, and a new method for constructing observers is found during the thesis by using Lannerheds theorem in combination with Pontryagin’s Minimum Priniple. This method enables evaluation of observer based residuals in Dymola without any selection of a specific operating point, as well as evaluation of observers based on high-index Differential Algebraic Equations, DAEs. The method also results in completely different behaviourof the estimation error compared to the method that is already implemented inthe FDT. For example, one of the new observer-implementations achieves both an estimation error that converges faster towards zero when no faults are implementedin the monitored system, and a sharper reaction to implemented faults.

  • Samuelsson, Anna
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM.
    Mamma, jag är hetero.: En queerteoretisk analys av högstadielärares ord om sexualundervisning.2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to enlighten heteronormativity through teachers talk about sexualities, gender and identity within sex education. This study is based on interviews with five teachers working with youths aged 13-15, and analysed with inspiration from queer theory. The focus is heteronormativity mapping- finding and analyse how heteronormativity works and different ways it comes through. In this study homosexuality is formed as divergent, whilst heterosexuality is seen as the normal state and often not even spoken of as a sexuality. With inspiration from Judith Butler and Gayle Rubin the study is also analysing gender and sexuality referring to the heterosexual matrix and the hierarchical valuation of sex acts. 

  • Rangdal, Emma
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM.
    Dödsdömd i AmeriKKKa: En diskurs samt bildanalys utav medierapporteringen av de tre fallen; Trayvon Martin, Michael Brown och Eric Garner2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this Candidate thesis, I will analyze the media coverage of the Trayvon Martin, Michael Brown and Eric Garner cases. I investigate the connection between a historic racist ideology which permeates American history and how this pervade todays current stereotyping of black bodies, with the presuming theory that Rap and Hip Hop Culture also is a way to criminalize these subjects. This will come about through a discourse- and visual analysis of different articles from four major publications and news distributers; CNN, CBS News, The Guardian US and The Washington Post

  • Hallros, Per
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM.
    Detta är helt otroligt!!: En diskursiv nätverksanalys av kommentarer på reseskildringar på YouTube2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay explores how comments on travel videos on YouTube are designed and what they refer to in relation to the videos. In the essay, I delve into a number of research areas, ranging from basic tendencies which explain the need of travel to more specific fields like comments on YouTube. In order to find out how the comments are designed and what they refer to in relation to the travel videos, in other words what the viewers’ comments are actually about, I conduct a discursive network analysis. The results of the analysis are in turn presented through figures of my own design. All the comments could through my method be divided into ten more or less distinct categorical blocks, which together form the discursive model of conversation in the comment section of travel videos on YouTube.If producers are aware of how a discourse finds expression and can distinguish elements of distraction from elements of opportunities, it is possible for them to extract relevant information from the comment section on YouTube which they can use to their advantage when developing their productions.

  • Oscar, Karlsson
    Linköping University, Department for Studies of Social Change and Culture.
    KUNSKAP VIA UNDERHÅLLNING: En kvalitativ undersökning av verksamheten på vetenskapliga center2017Independent thesis Basic level (degree of Bachelor), 10 HE creditsStudent thesis
    Abstract [en]

    Through the advent of new media, new ways of communicating knowledge are also growing. Alternative instruments for education.Recently there have been medial arenas, in the form of scientific museums and centers. Public places for visits to study and entertainment purposes, where knowledge is presented through more attractive forms than text only.There are already many scientific articles that discuss medial arenas of this kind. How they act as tools for learning and how to make the most of such interactive places, as visitors. But how do media producers work in such arenas? What is their own understanding of the activities they conduct and how do they work to communicate knowledge to a larger public? What value does the science center have for science? And what is the meaning of scientific communication in general?In this survey, I use interviews with involved people, to get an understanding of their ways of looking at, and communicating, knowledge.For those who read this essay in interest for surveys and studies based on interviews, I recommend skipping to chapter 5: Theoretical perspective and method.If your greatest interest in this essay lies with scientific centers and visual communication, the relevant parts starts on the next page. In chapter 1 and 4 I explain the basic, and already common, facts on this kind of visual media, before I go into the survey I myself have performed with relevant people, in chapter 6 and forward.

  • Pettersson, Victoria
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM.
    FORE! Och se upp för patriarkatet: En kritisk diskursanalys av tidningen Svensk Golf2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Throughout the history, sport has been an activity primarily led by men. However, times have changed and an apparent increase in female appearance, within sport, has been visible. As a matter of fact, female athletes represent about 40% of all athletes in total around the world. Nevertheless, despite of increasing female attendance in sport, women receives limited media coverage and when they are presented in the media, it is often with a reduced tone. Meanwhile, the male athletes and their athletic performance are frequently written about in the media and often expressed as the highlights of the sporting event.  

    The purpose of this study is to examine the similarities, as well as differences, in the representation of female and male golfers in the magazine Swedish Golf. The study predominately uses critical discourse analysis and a gender perspective. The analysed data will suggest that there are several trends that indicate a gender hierarchy in which the female golf players have a lower status than the male ones.

  • Manfred, Victoria
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM.
    "Endometri-vadå"?!: En tvärvetenskaplig analys av hur endometrios och endometriospatienter konstrueras i svenska dagstidningar.2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    During the 4th of february 2016 the Swedish government decided to give six million kronor to the Swedish social board (Socialstyrelsen) so that the board could develop national guidelines for endometriosis. The news media and “the press”, when reporting on this and the dicease in general, becomes co-creators in the public discourse of endometriosis and the understanding of the endometriosis patients. This thesis therefore examines how six of the larges newspapers in Sweden have written about endometriosis since the governments decision and six month a head. It has also been intreresting to look for changes during time in the newspapers. The analysis has used discourse theory as a basis and has also been inspired by gender, queer and intersectional studies. By doing so the thesis can show that a conflict is formed within the discourse between endometriosis patients and the doctors but also that an expertness is important within the discourse that is related and adapted depending on which subject it refers to. The analysis also shows that endometriosis patients are made into victims, but this is also depending on who endometriosis patient is. Therefore a factor of success in important to avoid victim-making. One of the most central parts of the discourse is the importance of motherhood. As for endometriosis, it is described as something that affects only women, an furthermore as inadequate and as binary in terms of intensity.

  • Ögren, Mikael
    et al.
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Wikblad, Ludwig
    Linköping University, Department of Computer and Information Science, Software and Systems.
    En testprocess för webbutvecklingsprojekt med små team2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Finding a suitable approach for testing in small development teams is a challenge. Many small companies view traditional test processes and test process improvement models as too resource intensive for their needs. Minimal Test Practice Framework (MTPF) is a framework for testing which purpose is to provide a minimalistic approach to test improvement. The goal of this study was to examine how MTPF can be adapted to a small development team without incurring a time cost that the team would experience as too high. The study was performed in the department Web \& Mobile of the company Exsitec. At the department teams of 2-6 people develop web applications to business customers. During the study a testprocess was developed in close cooperation with the developers of the department with the aim of adapting it as well as possible to the needs of the department. The study was performed as action research in three phases, according to the method Cooperative Method Development, in a project with two developers. During the first phase all developers in the department were interviewed to establish an understanding of the environment for the study. During the second phase a set of possible improvements was developed together with the developers. During the third phase some of these improvements were implemented and evaluated. By focusing on unit testing central business logic in the application the developed test process improved the developers confidence in the code quality without being perceived as too resource intensive.

  • Landstedt, Erik
    Linköping University, Department of Mathematics.
    Fractals and Billiard Orbits on Sierpinski Carpets2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    This Bachelor's thesis deals with fractals and orbits on Sierpinski carpets. We present the fundamental theory regarding fractals and some illustrative examples together with fractal billiards. In the latter part of the thesis we use elementary methods to present an original proof concerning the closure of some billiard orbits on Sierpinski carpets. A survey of the article Periodic Billiard orbits of self-similar Sierpinski Carpets, see [8], has been done, in which we make a discussion about one open question regarding reflections on the carpet. Furthermore, we state and prove some propositions related to this open question.

  • Yildiz, George
    et al.
    Linköping University, Department of Computer and Information Science.
    Iselius, Fredrik
    Linköping University, Department of Computer and Information Science.
    Lundgren, Patrik
    Linköping University, Department of Computer and Information Science.
    Persson, Henrik
    Linköping University, Department of Computer and Information Science.
    Persson Proos, Daniel
    Linköping University, Department of Computer and Information Science.
    Sörliden, Pär
    Linköping University, Department of Computer and Information Science.
    Nilsson, Kristian
    Linköping University, Department of Computer and Information Science.
    Analysera stora mängder video och bildmaterial2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Larsson, Kim
    et al.
    Linköping University, Department of Computer and Information Science.
    Ax, Lisa
    Linköping University, Department of Computer and Information Science.
    Dahlgren, Susanna
    Linköping University, Department of Computer and Information Science.
    Joelsson, Oskar
    Linköping University, Department of Computer and Information Science.
    Magnusson, Oscar
    Linköping University, Department of Computer and Information Science.
    Månsson, Daniel
    Linköping University, Department of Computer and Information Science.
    Renius, Olle
    Linköping University, Department of Computer and Information Science.
    Akutplattan: Rädda liv i digitalt format2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Alvila, Markus
    et al.
    Linköping University, Department of Computer and Information Science.
    Johansson, Jonathan
    Linköping University, Department of Computer and Information Science.
    Johansson, Philip
    Linköping University, Department of Computer and Information Science.
    Lenz, Silas
    Linköping University, Department of Computer and Information Science.
    Lindmark, Sebastian
    Linköping University, Department of Computer and Information Science.
    Norberg, Emil
    Linköping University, Department of Computer and Information Science.
    Regard, Viktor
    Linköping University, Department of Computer and Information Science.
    Övervakning och bedömning av flygledares prestanda2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Palm Myllylä, Johannes
    et al.
    Linköping University, Department of Computer and Information Science.
    Skarman, Frans
    Linköping University, Department of Computer and Information Science.
    Thorarensen, Christian
    Linköping University, Department of Computer and Information Science.
    Vigren, Malcolm
    Linköping University, Department of Computer and Information Science.
    Bränning, Jonathan
    Linköping University, Department of Computer and Information Science.
    Thuresson, Rasmus
    Linköping University, Department of Computer and Information Science.
    Lindberg, Adam
    Linköping University, Department of Computer and Information Science.
    Utveckling av en webbapplikation för avtalshantering med ramverket Ruby on Rails2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport behandlar utvecklingen av en webbapplikation för avtalshantering med arbetsnamnet Boardeaser Contracts. Applikationen utvecklades av studenter på Tekniska högskolan vid Linköpings universitet på uppdrag av Boardeaser AB. Rapporten syftar till att ge en överblick gällande utvecklingsarbetet och resultat samt ge svar på uppsatta frågeställningar. Applikationen har utvecklats med ramverket Ruby on Rails. Rapporten går igenom grundläggande teori gällande ramverket samt de mjukvarupaket som använts för implementationen. Rapporten behandlar också den övergripande utvecklingsmetoden samt metod för erfarenhetsfångst. Projektets resultat blev en fungerande webbapplikation med önskad funktionalitet. Resultat och metoder diskuteras och kritiseras, det ges även förslag på alternativa metoder. Arbetet sätts i ett vidare sammanhang när bland annat applikationens energiförbrukning diskuteras. Rapportens slutsatser är kortfattat att den metod som beskrivs i rapporten går att använda för att utveckla en applikation som skapar värde för kunden. Det konstateras också att Ruby on Rails lämpar sig relativt väl för utveckling av webbapplikationer. Varje medlem i projektgruppen har också skrivit ett individuellt bidrag till rapporten. Där utreds olika områden relaterade till projektet mer detaljerat. Dessa bidrag hittas i slutet på rapporten.

  • Öhlin, Petra
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Prioritizing Tests with Spotify’s Test & Build Data using History-based, Modification-based & Machine Learning Approaches2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis intends to determine the extent to which machine learning can be used to solve the regression test prioritization (RTP) problem. RTP is used to order tests with respect to probability of failure. This will optimize for a fast failure, which is desirable if a test suite takes a long time to run or uses a significant amount of computational resources. A common machine learning task is to predict probabilities; this makes RTP an interesting application of machine learning. A supervised learning method is investigated to train a model to predict probabilities of failure, given a test case and a code change. The features investigated are chosen based on previous research of history- based and modification-based RTP. The main motivation for looking at these research areas is that they resemble the data provided by Spotify. The result of the report shows that it is possible to improve how tests run with RTP using machine learning. Nevertheless, a much simpler history- based approach is the best performing approach. It is looking at the history of test results, the more failures recorded for the test case over time, the higher priority it gets. Less is sometimes more. 

  • Almgren, Johan
    et al.
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Elingsbo, Gustav
    Linköping University, Department of Electrical Engineering, Vehicular Systems.
    Route Based Optimal Control Strategy for Plug-In Hybrid Electric Vehicles2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    More restrictive emission legislations, rising fuel prices and the realisation that oil is a limited resource have lead to the emergence of the hybrid electric vehicles.To fully utilise the potential of the hybrid electric vehicles, energy management strategies are needed. The main objective of the strategy is to ensure that the limited electric energy is utilised in an efficient manner.This thesis develops and evaluates an optimisation based energy management strategy for plug-in hybrid electric vehicles. The optimisation methods used are based on a dynamic programming and ECMS approach. The strategy is validated against Vsim, Volvo Cars' performance and fuel consumption analysis tool as well as against strategies where parts of the optimisation is replaced by logic. The results show that the developed strategy consumes less fuel both compared to the corresponding Vsim strategy and the logic strategies.

  • Hultman, August
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems.
    DC-DC Converter Design for Solar Power in Hot Environments2017Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    A company in Linköping has a project where a solar power home system is designed. The plan is that families that lack grid connection in rural areas of Mali and other countries shall use this system for cooking food and powering every day items. Designing a solar home system for West Africa is more difficult than for other parts of the world, mainly because of the climate, with heat and dust particles in the air, but also because the installation location often is unreachable in short notice. This makes for several specific requirements like high ambient temperature, passive cooling, high efficiency and a long mean time between service needed. On top of this, to get the system modular and easy to install, each physical panel should be independent and smart. The system designed is a push pull dc step-up converter that can be assembled to the back of a solar panel. A base platform for the converter is built and a method of power line communication is proposed. Tests show promising results and further development is ongoing.

  • Qaderi, Idris
    et al.
    Linköping University, Department of Management and Engineering, Production Economics.
    Bouzeid, Ali
    Linköping University, Department of Management and Engineering, Production Economics.
    Drivers and Performance Factors of Mergers and Acquisitions: A Case Study at Deutsche Post DHL2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis explores and evaluates the drivers and performance factors of merger and acquisition (M&A) activity at Deutsche Post DHL (DPDHL). Furthermore, the “success paradox” related to M&A found in theory is addressed by analyzing how well it rhymes with the activity and performance of M&As at DPDHL. The methodology used to reach the aim can be characterized as an explorative and qualitative case study with an inductive approach. We review literature and interview stakeholders both within and outside the DPDHL group to present an in-depth view of the drivers causing M&As and factors affecting the performance of the transactions at DPDHL. Consequently, it has been possible to reach reality driven conclusions and recommendations tailored for DPDHL. We found that the success rate of M&A transactions at DPDHL is high and primarily triggered by strategic motives, such as achieving market power, acquiring capabilities, accessing new markets and to follow customers. In addition, we found that overall, DPDHL has systems and procedures that are consistent with theory findings and views of practitioners. However, we found two improvement areas for the overall success rate of transactions at DPDHL. Firstly, the biggest change for DPDHL going forward will lie within post-merger integration and management. There is a need to develop an independent, non-political, and transparent setup for M&A teams to better integrate and track performance after each transaction. The aim should be to create local ownership at all levels to better reap synergy effects. Secondly, there is a potential benefit to streamline the strategic models used to retain key people after the M&As. Moreover, relating the findings of the study to the “success paradox”, we argue that success ought to be measured on multiple motives instead of by only measuring financial outcome of deals as done historically. In our view, the inadequate measurement of M&A performance is a reason for the seemingly high failure rates found in empirical studies. It would only be logic to measure the success of something by assessing whether or not the motives were achieved, be that strategic or financial.

  • Alvarsson, Andreas
    Linköping University, Department of Computer and Information Science.
    The development of a sports statistics web application: Sports Analytics and Data Models for a sports data web application2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Sports and technology have always co-operated to bring better and more specific sports statistics. The collection of sports game data as well as the ability to generate valuable sports statistics of it is growing. This thesis investigates the development of a sports statistics application that should be able to collect sports game data, structure the data according to suitable data models and show statistics in a proper way.

    The application was set to be a web application that was developed using modern web technologies. This purpose led to a comparison of different software stack solutions and web frameworks. A theoretical study of sports analytics was also conducted, which gave a foundation for how sports data could be stored and how valuable sports statistics could be generated.

    The resulting design of the prototype for the sports statistics application was evaluated. Interviews with persons working in sports contexts evaluated the prototype to be both user-friendly, functional and fulfilling the purpose to generate valuable statistics during sport games.

  • Altun, Nergiz
    et al.
    Linköping University, Department of Social and Welfare Studies. Linköping University, Faculty of Arts and Sciences.
    Dunerholm, Katerina
    Linköping University, Department of Social and Welfare Studies. Linköping University, Faculty of Arts and Sciences.
    Palladium: En verksamhetsutvärdering2008Report (Other academic)
    Abstract [sv]

    Denna utvärdering syftar till att belysa Palladiumprojektet ur ett antal olika perspektiv. Målet är att analysera hur Palladiums verksamhet har fungerat i relation till de mål och intentioner som fanns i planeringen av projektet, både från kommunpolitikers håll och från brukarna av verksamheten, det vill säga ungdomarna. Vi har undersökt verksamhetens organisation, hur den fungerat och om det finns brister i verksamheten, samt om huruvida det finns ett fortsatt behov av Palladium i Katrineholms kommun. Utvärderingen grundar sig på dokumenten Idéskiss- kultur- och mediehus för unga i Katrineholms kommun, Palladium no smoking, och Palladium - café och kulturhus för unga, ett antal intervjuer med politiker, en tjänsteman och ungdomar som är involverade i projektets verksamhet samt en observation.

  • Nikolov, Zhivko
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Effect of upstream turbulence on truck aerodynamics2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The aerodynamic team at SCANIA has discovered the need to investigate the effect of the upstream turbulence conditions on the aerodynamics of the trucks. This need comes from the fact that there are differences between the drag coefficients obtained using computational fluid dynamics (CFD) and the on-road measurements. This difference can lead to wrong predictions of fuel consumption and emissions, which can cause incorrect evaluation of design changes. In this study the problem of modeling upstream turbulence in CFD simulations is addressed together with its effect on the aerodynamics of the trucks. To achieve this, representative values of turbulence intensity and length scale were found from the work of different researchers, who performed on-road measurements for various conditions. These values were then used in a method by Jakob Mann to generate a synthetic turbulence field. This field was then used to generate time varying velocity components, added to the mean velocity at the inlet of a CFD simulation. After the implementation of the method it was discovered that the conditions at the test section of the virtual wind tunnel were representative of the on-road measurements. The results showed drag increase and wake length decrease, similar to previous studies performed on simple geometries. It also showed that the higher mixing of the flow increases the drag by surface pressure increase of forward facing surfaces and pressure decrease at the base.

    These conclusions may be extended to other bluff body geometries and it shows the importance of good design around gaps. The comparison between two truck geometries showed that a truck with better aerodynamics in a smooth flow shows less drag increase with introduction of upstream turbulence.

  • Klamer, Linda
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Design and Evaluation of a Visualizing Tool for Logistics Analysis2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Communicating complex relationships discovered with logistics analysis is a challenge within Life Cycle Management. The aim of this thesis is to propose a design for a visualization tool that simplifies such communication for improved expert-manager collaboration. Semi-structured interviews were conducted with expert users - the prospective primary user group of the tool - in order to gain knowledge about the requirements. Based on this, a HiFi prototype was developed using Axure and its usability was evaluated using scenario-based approach and SUS questionnaire. The results revealed that the experts found current methods both time consuming and challenging. A tool with the purpose of displaying results from logistics analysis – for both experts and managers - should offer flexibility, both in terms of functionality and appearance. In addition, it is essential to reduce the complexity to increase the understanding of novices. Future work should include customers in the design process. 

  • Karlsson, Joel
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Internet of Things – Does Particle Photon rely too much on its own cloud solution?2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Internet of Things is rapidly growing and there are many devices and cloud solutions on the market. This thesis addresses the usage of Particle Photon alongside Microsoft Azure and intends to determine its suitability as an IoT solution. Particle Photon is bundled with Particle Cloud which is a comprehensive solution that makes IoT simple, swift and cheap – but how good is the device if the service ceases to exist? To determine this dependency and its overall IoT suitability, tests were performed to measure transmission limitations as well as reliability both with and without the included cloud service. In addition, the research method includes a Microsoft Azure implementation. The results show that Particle Photon and Microsoft Azure makes a great IoT solution, with or without its own cloud solution – even though most of the ease-of-use and benefits comes from the cloud service. Using Particle Cloud alongside Particle Photon and Microsoft Azure reduces transmission time and increases reliability compared to only using Particle Photon. 

  • Axelsson, Nils
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Dynamic Programming Algorithms for Semantic Dependency Parsing2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Dependency parsing can be a useful tool to allow computers to parse text. In 2015, Kuhlmann and Jonsson proposed a logical deduction system that parsed to non-crossing dependency graphs with an asymptotic time complexity of O(n3), where “n” is the length of the sentence to parse. This thesis extends the deduction system by Kuhlmann and Jonsson; the extended deduction system introduces certain crossing edges, while maintaining an asymptotic time complexity of O(n4).

    In order to extend the deduction system by Kuhlmann and Jonsson, fifteen logical item types are added to the five proposed by Kuhlmann and Jonsson. These item types allow the deduction system to intro-duce crossing edges while acyclicity can be guaranteed. The number of inference rules in the deduction system is increased from the 19 proposed by Kuhlmann and Jonsson to 172, mainly because of the larger number of combinations of the 20 item types.

    The results are a modest increase in coverage on test data (by roughly 10% absolutely, i.e. approx. from 70% to 80%), and a comparable placement to that of Kuhlmann and Jonsson by the SemEval 2015 task 18 metrics. By the method employed to introduce crossing edges, derivational uniqueness is impossible to maintain. It is hard to defien the graph class to which the extended algorithm, QAC, parses, and it is therefore empirically compared to 1-endpoint crossing and graphs with a page number of two or less, compared to which it achieves lower coverage on test data. The QAC graph class is not limited by page number or crossings.

    The takeaway of the thesis is that extending a very minimal deduction system is not necessarily the best approach, and that it may be better to start off with a strong idea of to which graph class the extended algorithm should parse. Additionally, several alternative ways of extending Kuhlmann and Jonsson are proposed.

  • Fallgren, Per
    Linköping University, Department of Computer and Information Science.
    Thoughts don't have Colour, do they?: Finding Semantic Categories of Nouns and Adjectives in Text Through Automatic Language Processing2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Not all combinations of nouns and adjectives are possible and some are clearly more fre- quent than other. With this in mind this study aims to construct semantic representations of the two types of parts-of-speech, based on how they occur with each other. By inves- tigating these ideas via automatic natural language processing paradigms the study aims to find evidence for a semantic mutuality between nouns and adjectives, this notion sug- gests that the semantics of a noun can be captured by its corresponding adjectives, and vice versa. Furthermore, a set of proposed categories of adjectives and nouns, based on the ideas of Gärdenfors (2014), is presented that hypothetically are to fall in line with the produced representations. Four evaluation methods were used to analyze the result rang- ing from subjective discussion of nearest neighbours in vector space to accuracy generated from manual annotation. The result provided some evidence for the hypothesis which suggests that further research is of value. 

  • Bennevall, Marcus
    Linköping University, Department of Mathematics.
    Creativity in Mathematics Curricula – An International Comparison between Singapore, Hong Kong, Sweden, and Norway2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Studies have shown that creative mathematically founded reasoning (CMR) outperforms algorithmic reasoning (AR) in regards to retention and (re)construction of knowledge. This suggests that creativity should be encouraged in national high-school mathematics curricula. The aim of the present study is to compare how creativity is framed in different national high-school mathematics curricula, using the following definition: creativity is the characteristics of people, processes, and environments which lead to new and original products that are useful or otherwise attractive to an individual or a society. Utilizing content and discourse analysis, the present study thus contrasts how the high-school mathematics curricula of Singapore, Hong Kong, Sweden, and Norway handle and value creativity, and also examines which role creativity takes in each curricula.

    Findings suggest that Singapore’s curriculum emphasizes creativity the most, and frequently does so in relation to assessment. Hong Kong’s curriculum is found to emphasize creativity in diverse ways, often using words with connotations to playfulness. Analysis of Sweden’s curriculum indicates a relatively minute focus on creativity, tending to put it in a teacher-centered context. A feature of Norway’s curriculum is an increasing emphasis on creativity as courses approach tertiary education. This also suggests a rising value of creativity in its curriculum. A similar though not as pronounced trajectory is found also in Singapore’s curriculum. In the Asian and Norwegian curricula, creativity is expressed both as a means and an end, while in Sweden’s curriculum it is only seen as an end.

    The results are discussed in terms of potential reasons for the prominent national features, and the study also includes an evaluation of the aptness of the suggested definition of creativity, a review of the limitations of the study, as well as propositions for further research. Finally, two recommendations are given to the National Agency for Education in Sweden – Skolverket – based on the results of the study: 1) diversify the emphasis on creativity in the curriculum, and 2) ensure alignment between what teachers value and what Skolverket values with respect to creativity.

  • Malmberg, Erik
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Visualization of Internet of Things Data from a District Heating System2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One application of the Internet of Things that is currently developed is the collection of data from district heating systems. This development leads to the problem of how the collected data should be used to operate the systems in a manner that reduces the dependency on fossil fuels. This thesis proposes a characterization of this problem into visualization tasks and requirements, as well as a visualization application, based on the tool Power BI, for gaining insight into how to operate a district heating system. The tasks and requirements were elicited during collaborative meetings and prototyping together with district heating experts. The perceived effectiveness of the visualization application was validated with a usability evaluation, including the usability metric for user experience questionnaire, with four district heating experts. The perceived efficiency was, however, found to be lacking compared to the other usability aspects. A redesign of one of the Power BI components, which according to the evaluation should improve the application, is also suggested.

  • Ludvigsen, Lars
    Linköping University, Department of Behavioural Sciences and Learning.
    Den gränsöverskridande intermediären: Partssamverkan och kompetensförsörjning gällande samordning av utbildning i och mellan praktikgemenskaper2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The study provides in-depth knowledge of an intermediary, an industry and employers' federation, opportunities for party and employer cooperation on competence-providing measures for member companies and regional development in a local labor market. The focus is on the intermediary's conditions as coordinator of education for machine operators' establishment in the labor market. The theoretical reference framework of the study is based on previous research on intermediates and the theoretical starting points from a boundary-crossing perspective, and is encompassed by learning mechanisms and dialectical learning processes. The empirical material is based on 12 interviews and two focus groups. The conclusions drawn are that the intermediary acts in a dual-level collaboration structure in three levels in and between two communities of practice: organizational, interpersonal and intrapersonal. What allows co-operation on the provision of skills for coordination of education is the formal knowledge council between the parties at national and regional level and legal support structures through vocational training agreements. The overriding coordination constraints are extensive matching problems between education and member companies, due to the absence of financial and educational support for the local labor market.

  • Ladekrans, Christian
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Leinmark, Niclas
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Analysis of tied up capital at Rejmes Lastvagnar2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Detta examensarbete har utförts vid Linköpings Tekniska Högskola och Tage Rejmes Lastvagnar AB i Norrköping under vårterminen 2016. Tage Rejmes Lastvagnar AB säljer och reparerar lastvagnar och bussar samt erbjuder leasing från företagets lokaler i Butängen, Norrköping. Branschen ställer höga krav på servicenivåer och flexibilitet kopplat till verksamhetens reparation och service av lastbilar, varpå behov av lagerhållna artiklar uppstår för företaget. Majoriteten av dessa artiklar köps in från en enskild leverantör som ensamt styr prognostisering av efterfrågan och inköpskvantiteter. Förändringar i företagets omsättning och förändringar i leverantörens beställningssystem har skapat en ökad kapitalbindning på Tage Rejmes Lastvagnar AB’s lager under de senaste åren. Denna studie har därför genom datainsamling, observationer och intervjuer jämfört det nuvarande beställningssystemet med teoretiska modeller, och genom artikelklassificering föreslagit alternativa tillvägagångssätt för företagets lagerstyrning. Resultatet av ABC-klassificeringen som utförts har kategoriserat företagets artiklar baserat på dess efterfrågan och volymvärde, varpå en differentiering av servicenivån för dessa kategorier gör att kapitalbindningen kan sänkas. Artiklar med låg efterfrågan och höga priser blir i det nya systemet beställningsvaror till priset av en sänkt servicenivå. Studiens analys visar dock att förändrade partiformningar kan öka det totala antalet transporter från beställaren, vilket i sig kan resultera i både en ökad miljöpåverkan och förhöjda orderkostnader.

  • Sjöholm, Filip
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Tivendale, Oliver
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Charging solutions - a route optimization and simulation2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Examensarbetet handlar om att minimera en total servicekostnad för företaget Chargestorm då de skall utföra service på sina laddningscentraler för elbilar. En ruttoptimering har gjorts som resulterar i ett antal rutter som är tänka att användas av en servicetekniker när denne åker runt och utför service på laddningscentralerna. En simulering har också gjorts för att påvisa de bästa tidsintervallen då olika typer av service kan ske, med målet att minimera den totala servicekostnaden.

  • Karlsson, Sandra
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Molin, Madelene
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Survey of delivery plan at Skanska Sverige AB distrikt Östergötland2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Kartläggning på Skanska AB Östergötland av informationsspridningen av leveransplanen. En identifikation av brister i denna spridning mellan inköpare, produktionsledare, produktionschef, underentreprenör och leverantör.

  • Balkefors, Anna
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Meinhold, Caroline
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    System anlysis and optimazation based on animal manure - a case study in Västervik municipality2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Östersjön är ett av världens sjukaste hav på grund av övergödning som bland annat beror på jordbrukets användning av gödselmedel och specifikt användandet av konstgödsel. Genom att istället ta tillvara på flytgödseln som finns tillgänglig hos lantbrukare på lokal nivå och låta flytgödseln passera genom en biogasanläggning kan både miljövänligt gödselmedel samt biogas utvinnas. Detta leder till att konstgödselanvändningen mer eller mindre skulle kunna uteslutas och ett mer miljövänligt och lokalt kretslopp skapas. Denna studie har utvecklat en optimeringsmodell som utifrån potentiella geografiska positioner för biogasanläggningar och annan teknik som avvattnar flytgödsel och tillverkar miljövänligt gödselmedel ska besluta om var de mest optimala placeringarna är. Dessutom ingår en kartläggning om var gårdar är placerade i kommunen, hur mycket flytgödsel som är tillgänglig på varje gård samt var behovet av gödselmedel finns i kommunen. Studien har utförts på uppdrag av Västerviks kommun i samarbete med en större forskningsgrupp på Linköpings universitet.

  • Larsson, Hanna
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Tica, Selma
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    A study of the order picking process at PostNord Logistic - improving the picking process by identifying factors that inhibit the prodctivity2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The goal of this study was to find factors affecting the pickers’ productivity negatively, in the order picking process, and to suggest a change that can increase the pickers’ productivity. By a qualitative approach the initial situation at PostNord was studied. The obtained results, after analyzing the initial situation, showed various factors that affect the pickers’ productivity negatively. All these contributed to waste, meaning that the picker did not use its time correctly according to Lean theory. These factors were analyzed and categorized into four problem areas, which are quality of tools, standardization of routines and leadership, article placement and jam in the corridors. Possible suggestions to improve the situation can be done with smaller or bigger changes. One solution is to improve the work procedures by standardizing the methods, which could be done by cooperating more with PEMA and using the pickers’ knowledge. Some suggestions and adjacent activities must be investigated further to find the best solutions.

  • Olsson, Elias
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Sundin, Jerry
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    On visionsystems for pallet identification and positioning for autonomous warehouse vehicles2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Avhandlingen genomfördes för att ge en överblick över olika kamerasystem och möjliga algoritmer för att upptäcka och positionera EUR-pallar i ett ställage. Systemen skulle användas av autonoma gaffeltruckar. Time-of-Flight kameror, stereomoduler och structured-light kameror undersöktes tillsammans med vanliga 2D-kameror och deras objektiv. Genomförandet utvärderade två olika 2D kameror tillsammans med en ZED stereomodul från Stereolabs. Det resulterande systemet lyckades identifiera och placera en pall med mer än 5 mm precision, men resultaten var baserade på begränsad testdata.

  • Ljung, Patrik
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Marpurg, Robin
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Packing Operation Efficiency at DSV Solutions2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Syftet med studien är att undersöka plockningsprocessen hos DSV Solutions i Norrköping och ta fram rekommendationer hur om hur plockningsprocessen kan tidseffektiveras. För att undersöka plockningsprocessen används observationer, tidsstudie, intervju och en workshop. Eftersom det finns effektiviseringspotential i plockningsprocessen är det viktigt att identifiera vilka aktiviteter som är värdeskapande och icke-värdeskapande. Om de icke-värdeskapande aktiviteterna kan minskas och lämna större plats åt de aktiviteter som skapar ett värde kan plockningsprocessen bli effektivare. Resultaten från tidsstudien indikerar på att en stor del av den tid som läggs på att plocka en order går åt till att utföra de icke-värdeskapande aktiviteterna "Transport" och "Övrig plockning". Transporten står för nästan 30 % och den övriga plockningen för cirka 15 % av den totala tiden för en order. Dessa aktiviteter bör tidsreduceras eftersom de inte tillför något värde till tjänsten som DSV erbjuder. De förbättringsförslag som läggs fram i denna studie är att DSV bör förändra plockslingan. Plockslingan bör bli mer sammanhängande och tunga produkter borde placeras tidigt plockslingan.

  • Haugen, Jakob
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Nilsson, Daniel
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Simulation of the patient flow at Vrinnevi hospital emergency department2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Vrinnevi hospital in Norrköping faces a series of changes in conjunction with “Vision 2020”, the emergency ward is no exception. One of the goals that has been set up is to have 80 % of the arriving patients leave the ER within four hours, while having received the proper care. This study maps out the flow of patients through the ER, from arrival to discharge, as well as the process in between. The study also identifies the areas where bottlenecks in the patient flow are likely to appear and describes countermeasures to remedy such situations. In order to achieve this, a simulation model has been created. Facts used in the study are mainly based on previous studies, interviews with employees at the emergency ward, as well as some assumptions based on a theoretical background. Visits to the ER in question have been made, to gain a better understanding of the system that the simulation will illustrate. The study does not contain any deeper economic analysis. The focus is placed on examining whether the proposed changes to the system will affect the patient flow by measuring number of discharged patients within four hours, number of patients who receive a medical assessment within 30 minutes and the number of patients who get to meet a doctor within an hour. Five different scenarios, changing the work process at the ER, based on previous studies attempting to reduce patient throughput, have been created. The scenarios have been analyzed to form an understanding of how they may affect the different efficiency measurements of the emergency ward. The scenarios that have been simulated are: implementation of doctor-assisted triage, implementation on a “Clinical Initiative Nurse” in the waiting room, a reduction of administrative workload for the employees and adding resources to the emergency ward during specific hours of the day. Lastly, a combination scenario containing experiments with three of the most efficient measures has been created in order to achieve a discharge rate of 80 % within four hours. In conclusion, it is evident that all the scenarios have a positive effect on the efficiency measurements and that they all can be implemented so long as there is a positive attitude towards change and, in some cases, economic support.

  • Yesmin Shova, Tahmina
    Linköping University, Department of Culture and Communication.
    Liberal Citizenship in a Multicultural Society: Brian Barry's and William Galston's Approaches to Citizenship2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis demonstrates a comparative and analytic discussion of citizenship idea based on two distinct liberal doctrines of two contemporary political philosophers: Brian Barry and William Galston. Barry's egalitarian liberalism argues for 'common citizenship' notion in order to promote liberty and equal treatment of all individuals irrespective of any social differences. On the other hand, 'liberal pluralist citizenship' of William Galston's signifies his liberal pluralism to mitigate cultural and religious conflicts of liberal democratic society. The fundamental disagreements among these liberal approaches over the issues of public recognition of group rights and restricted state authority are analysed in this study. Finally, by analysing both the liberal positions under the challenge of multicultural issues the author defends Galston's liberal idea and judges it as more convincing than Barry's liberal approach.

  • Krantz, Kristin (Editor)
    Linköping University, University Library.
    Verksamhetsberättelse Linköpings universitetsbibliotek (LiUB) 20162016Report (Other academic)
    Abstract [sv]

    2016 har varit ett händelserikt år på biblioteket: Största delen av personalen på Vallabiblioteket har flyttat ut i paviljongen; magasinet Bokladan har flyttat från lokaler på Wahlbecks industriområde till Kärnhuset, campus Valla; rekrytering av en ny överbibliotekarie och helt nya typer av avtal med förlag. Samtidigt har den vanlig verksamheten fortsätt att utvecklas, med 100 % användarfokus. Det har varit ett år med utmaningar och tack vare ett stort engagemang från bibliotekets medarbetare har det blivit ett lyckat år.

  • Celine, Yildiz
    et al.
    Linköping University, Department for Studies of Social Change and Culture, Department of History, Tourism and Media.
    Wasan, Al-Omrani
    Linköping University, Department for Studies of Social Change and Culture, Department of History, Tourism and Media.
    En analys av hållbarhetspolicy kring Norrköpings hotell: En kvalitativ analys om hållbarhetspolicy för två hotell i centrala Norrköping, The Lamp och Best Western Princess Hotel2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Kleback, Oskar
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Study on Low Voltage Power Electronics Used for Actuator Control2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The aim of this thesis is to understand the current implementation, how different hardware and output frequency affects the hydraulic actuators in the current platform and Then an improve the controller should be presented. This needs to be both faster then the current controller and should not use more CPU recurses then necessary. With the understanding of current controller, three new regulators where implemented and tested. One uses a PI regulator and the other two uses an adaptive algorithm to generate the control signal. All where faster than the current one and the PI-implementation uses the lowest amount of CPU recurses, on the other hand this needs to be calibrated for the different hardware and output frequency’s. ThetwoadaptivecontrollersrequiresahigheramountofCPUrecurses, instead it requires less calibration to work.

  • Axwik, Anna
    et al.
    Linköping University, Department of Behavioural Sciences and Learning.
    Starräng, Amanda
    Linköping University, Department of Behavioural Sciences and Learning.
    Att vara synlig i skuggan- lokalvårdares organisatoriska- och psykosociala arbetsmiljö2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Jorshammar, Ellen
    Linköping University, Department of Physics, Chemistry and Biology, Biology.
    Påverkar fluoxetin antipredatorbeteendet hos Asellus aquaticus och skiljer sig effekten mellan populationer?2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Chemical substances originating from pharmaceuticals and personal care products are increasing in aquatic ecosystems. One compound of concern is the substance fluoxetine, which is one of the most widely prescribed antidepressant in the world. Recently, fluoxetine has been shown to affect behaviour of aquatic organisms. The aim of this study was to investigate the effects of fluoxetine on the freshwater isopod Asellus aquaticus L. To measure boldness and escape reactions, three concentrations of fluoxetine, 0, 3 and 30 ng L-1 were used in three behaviour assays (time to emerge from a refuge, general activity and escape behaviour from a predator). As study animals, I selected two populations, one from a lake with fish and one from a well without fish, as local predatory regime may affect prey behaviour. The exposure to fluoxetine at the highest concentration 30 ng L-1 caused A. aquaticus to leave the refuge faster in both the populations. Furthermore, fluoxetine affected the populations differently. Animals from the population used to fish changed towards a bolder behaviour, as they shortened the time still after predator attack. Disregarding effects of fluoxetine, the animals not used to fish were more active, made more stops and froze for a longer time after a simulated predator attack. Hence the results indicate that fluoxetine affected A. aquaticus differently depending on habitat. However, effects of fluoxetine in this study were lower than expected from previous studies. To better understand the effects of fluoxetine on A. aquaticus more studies with a wider range of fluoxetine concentrations are needed.