liu.seSearch for publications in DiVA
Change search
Refine search result
1234567 1 - 50 of 2715
CiteExportLink 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
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Oldest first
  • Newest first
Select all
  • 1.
    Toivo, Emma
    Linköping University, Department of Management and Engineering.
    Change Management and Supply Chain Management: Employee issues in implementation processes of SCM - The action and re-action related to changes in each stage of an implementation process2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    Competition on today’s market is fierce. Providing a defect-free product is no more a competitive advantage. Now money and focus is put on managing the supply chain, a competitive tool to thriving in today’s business climate. There are two distinct flow pipelines: the order information transfer pipeline and the product transfer pipeline, both dependent on the collaboration efforts of individuals.

    Evolving within supply chain management equals integrating the supply chain from basic to complex; from baseline or functional to internal or external. Bringing focus to where it is found to be lacking, this literary study highlights and connects issues that may arise during implementation of external supply chain integration. The focal point is thus on employee reactions to change, with each stage of implementation that the implementation issues connect to. Simultaneously, the study provides (pre)requisites to management during the different stages, which would support the implemented transition in its different phases.

    The result of this study is a Manger Model that gives an overview of each of the implementation stages, the requisites for management and issues regarding employees at each of the stages. Constructed to be applicable to more than just external integration the model encompasses all the gathered models and theories through a discussion of not only the complexity of the internal and the external supply chain, but also the complex nature of the individuals caught within the implementation, both from the manager’s as well as the employee’s point of view.

  • 2.
    Svensson, Marlene
    Linköping University, Department of Management and Engineering.
    A CFD Investigation of a Generic Bump and its Application to a Diverterless Supersonic Inlet2008Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This is a Master Thesis done at the Swedish Defence Research Agency with the purpose to design and investigate how different geometries of a compression surface integrated with an intake affects the performance such as distortion, boundary layer diversion, pressure recovery and deceleration of speed.

    The work was divided in two parts. In the first part, CFD calculations using the FOI developed Edge 4.1 code were made for the compression surfaces alone. In the second part the most promising design was integrated with an intake. Two more bumps with the intake were modelled and the three geometries were compared to the intake without bump. Surface flow, deceleration of Mach number, pressure recovery, mass flow, boundary layer diversion, lift and drag were the factors chosen to be examined, boundary layer diversion and pressure recovery being the two most vital.

  • 3.
    Jaque, Cassandra
    et al.
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Johansson, Anders
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Kromatografi av polära läkemedel och metaboliter med HILIC-teknik2013Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project was to investigate if retention of polar compounds that are given to treat tuberculosis, diabetes, inflammatory bowel disease and childhood leukemia could be obtained with HILIC separation. By varying different parameters for different types of columns the compounds were analyzed with the aim of finding guidelines for future method optimizations. To perform these analyzes three different columns were tested – ZIC-HILIC (silica-based with zwitterions), ZIC-pHILIC (polymer-based with zwitterions) and XBridge Amide (amide functions). The results were evaluated with selected quality measures. The parameters being varied were pH, temperature, flow rate, type of buffer and ionic strength. In addition, comparisons between isocratic and gradient separations were performed.

     

    Over 1 000 analyzes were conducted in which retention of 16 of total 18 substances were successfully obtained with HILIC. The columns that generated the best results in terms of greatest number of identified compounds were ZIC-HILIC and XBridge Amide. ZIC-pHILIC offered a wide pH range but generally gave inferior chromatography. The influence of the different parameters on the results has not been investigated in sufficient scope. This means that no specific methods for the different drug groups can be reported.

  • 4.
    Mattsson, David
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Arts and Sciences.
    Driving and its related driving behaviour as viewed by Sensation Seeking and Locus of Control when regarding ADAS2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Driving is a high-risk adventure and a highly complex task; yet anyone with a driver's licence might perform daily. The driving task is characterised by requiring competence and control to cope with the continuous changing risky driving environment. Driving is a complex task, some think of it as strenuous whereas others think of it as quite effortless and fun.

    The task of driving is affected by the driver's driving behaviour, which in turn is affected by the driver's personality. Since the early 1950s, researchers have been interested in how driver's driving personality affects the driver's driving behaviour and thus driving performance. Attitudes such as risk perception and trust towards driving are only a few of a myriad of personality attitudes that could affect the driving performance. Two psychological traits can be used to quantify the driver's driving behaviour in form of propensity for risk taking and trust in driving: Sensation Seeking and Locus of Control. Both traits can be used as a small step to give an explanation as to why drivers do as they do in the driving environment.

    Traffic works as it works with a steady flow of things. Sometimes the flow is disturbed and traffic-related accidents occur. One type of accidents is rear-end collision, when the driver collides with the rear part of the car in front. In order to reduce the amount of such accidents, various forms of Advanced Driver Assistance Systems, ADAS, are introduced to aid drivers in their driving. There are many forms of ADAS, but they all share a common base in that they all aim to make the driver aware of the risks in her driving. The ADAS specific for rear-end collisions all aim to reduce the number of rear-end collisions that occurs annually in the traffic, which can be done by making the driver aware of the risks in her current driving performance.

  • 5.
    Aria, Erfan
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Investigation of automated vehicle effects on driver’s behavior and traffic performance2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Advanced Driver Assistance Systems (ADAS) offer the possibility of helping drivers to fulfill their driving tasks. Automated vehicles are capable of communicating with surrounding vehicles (V2V) and infrastructure (V2I) in order to collect and provide essential information about driving environment. Studies have proved that automated vehicles have a potential to decrease traffic congestion on road networks by reducing the time headway, enhancing the traffic capacity and improving the safety margins in car following. Furthermore, vehicle movement and driver’s behavior of conventional vehicles will be affected by the presence of automated vehicles in traffic networks. Despite different encouraging factors, automated driving raises some concerns such as possible loss of situation awareness, overreliance on automation and degrading driving skills in absence of practice. Moreover, coping with complex scenarios, such as merging at ramps and overtaking, in terms of interaction between automated vehicles and conventional vehicles need more research. This thesis work aims to investigate the effects of automated vehicles on driver’s behavior and traffic performance. A broad literature review in the area of driving simulators and psychological studies was performed to examine the automated vehicle effects on driver’s behavior. Findings from the literature survey, which has been served as setup values in the simulation study of the current work, reveal that the conventional vehicles, which are driving close to the platoon of automated vehicles with short time headway, tend to reduce their time headway and spend more time under their critical time headway. Additionally, driving highly automated vehicles is tedious in a long run, reduce situation awareness and can intensify driver drowsiness, exclusively in light traffic. In order to investigate the influences of automated vehicles on traffic performance, a microscopic simulation case study consisting of different penetration rates of automated vehicles (0, 50 and 100 percentages) was conducted in VISSIM software. The scenario network is a three-lane autobahn segment of 2.9 kilometers including an off-ramp, on-ramp and a roundabout with some surrounding urban roads. Outputs of the microscopic simulation in this study reveal that the positive effects of automated vehicles on roads are especially highlighted when the network is crowded (e.g. peak hours). This can definitely count as a constructive point for the future of road networks with higher demands. In details, average density of autobahn segment remarkably decreased by 8.09% during p.m. peak hours in scenario with automated vehicles. Besides, Smoother traffic flow with less queue in the weaving segment was observed. Result of the scenario with 50% share of automated vehicles moreover shows a feasible interaction between conventional vehicles and automated vehicles. Meaningful outputs of this case study, based on the input data from literature review, demonstrate the capability of VISSIM software to simulate the presence of automated vehicles in great extent, not only as an automated vehicle scenario but also a share of them, in traffic network. The validity of the output values nonetheless needs future research work on urban and rural roads with different traffic conditions.

  • 6.
    Öbrink, Emil
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Analysis and streamline the information flow at Baltic Sea Gateway2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    I takt med att informationen blir en allt större del av logistiken måste även den utvecklas och inte bara den fysiska delen. Hos Baltic Sea Gateway har informationslogistiken haft en stor utveckling på sidan som heter Fredriksskans medan Granudden som den andra sidan av vattnet heter har fortsatt som tidigare. I det här arbetet kommer informationsflödet på Granudden att ses över för att se vilka förbättringar som kan utföras på detta flöde som även kommer att stötta det fysiska flödet. Metoderna som använts för insamling av information till nulägesbeskrivningen och kartläggningen är intervjuer och observationer. Delar av informationen har fåtts ut genom tre av företagens interna system. Flödeskartläggningen visade att informationen på terminal Granudden har väldigt många steg samt att det finns två kundserviceavdelningar som båda hanterar information som rör det fysiska arbetet på terminal Granudden. Genom att ha två kundserviceavdelningar som sköter informationen på samma terminal sker en stor del onödig kommunikation och personalen i magasinet vet inte alltid vem de ska kontakta. En anledning till att informationsflödet är komplicerat hos Baltic Sea Gateway är för att det finns två olika kundserviceavdelningar där en endast tar hand om en kund medan den andra tar hand om all annan information inom och ut från företaget. Dessa två avdelningar kommunicerar med varandra och till viss del med samma personal i magasinen. Genom kartläggningen av informationsflödet på terminal Granudden har det visats att det finns en del problem i informationskedjan. Informationskedjan är onödigt komplex och en del arbetsuppgifter saknas samt att vissa uppgifter utförs i onödan. Denna rapport resulterar i ett antal förbättringsförslag där de två viktigaste rekommendationerna är att använda sig av en kundserviceavdelning istället för två samt att magasinsplanering måste ske för alla magasin på terminal Granudden.

  • 7.
    Aevan, Nadjib Danial
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
    MDO Framework for Design of Human PoweredPropellers using Multi-Objective Genetic Algorithm2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis showcases the challenges, downsides and advantages to building a MultiDisciplinary Optimization (MDO) framework to automate the generation of an efficientpropeller design built for lightly loaded operation, more specifically for humanpowered aircrafts. Two years ago, a human powered aircraft project was initiatedat Linköping University. With the help of several courses, various students performedconceptional design, calculated and finally manufactured a propeller bymeans of various materials and manufacturing techniques. The performance ofthe current propeller is utilized for benchmarking and comparing results obtainedby the MDO process.The developed MDO framework is constructed as a modeFRONITER project wereseveral Computer Aided Engineering softwares (CAE) such as MATLAB, CATIAand XFOIL are connected to perform multiple consequent optimization subprocesses.The user is presented with several design constraints such as blade quantity,required input power, segment-wise airfoil thickness, desired lift coefficientetc. Also, 6 global search optimization algorithms are investigated to determinethe one which generate most efficient result according to several set standards.The optimization process is thereafter initialized by identifying the most efficientchord distribution with a help of an initial blade cross-section which has been previouslyused in other human powered propellers, the findings are thereafter usedto determine the flow conditions at different propeller stations. Two different aerodynamicoptimized shapes are generated with the help of consecutively performedsubprocesses. The optimized propeller requires 7.5 W less input power to generatenearly equivalent thrust as the original propeller with a total efficiency exceedingthe 90 % mark (90.25 %). Moreover, the MDO framework include an automationprocess to generate a CAD design of the optimized propeller. The generatedCAD file illustrates a individual surface blade decrease of 12.5 % compared tothe original design, the lightweight design and lower input power yield an overallpropulsion system which is less tedious to operate.

  • 8.
    Odisho, Ramail
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    En studie om Flow i ett bowlingspel2015Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [sv]

    Detta projekt har gått ut på att förstå det psykologiska begreppet Flow teoretiskt för att sedan praktiskt implementera det i ett spel, vars utveckling med spelmotorn Unity också hör till detta projekt. Flow kallas det optimala tillstånd som en människa kan komma in i när den utför en aktivitet och blir helt försjunken i aktiviteten att den glömmer bort viktiga saker som till exempel att gå på toalett. Tanken är att låta en aktivitets utmaning vara balanserad med personens skicklighet. Genom att ta fram några förslag på förbättringar, av ett redan existerande bowlingspel har dessa sedan implementerats. Spelet har sedan testats av några deltagare och utvärderats med ett formulär och genom observation om huruvida deltagarna uppnådde en flowupplevelse eller inte. Resultatet visade sig vara något positivare än vad det borde vara, men ändå värdefullt och användbart. Syftet med projektet uppfylldes och frågeställningarna blev besvarade.

  • 9.
    Fredriksson, Elin
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Sjöberg, Helene
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Minskar handel den ekonomiska ojämlikheten i utvecklingsländer?: En studie över tidigare europeiska kolonier med kust2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The impacts of trade on the society are a common subject of debate, both in the research field of economics and in the political debate. The lack of consensus poses a risk in political decision-making. New trade agreements are being implemented while the role of developing countries is growing on the global market. Hence, there is an increasing importance of examining the actual impacts of trade. This study, therefore, analyses the impact of trade on the economic inequality in developing countries. This study hypothesizes that trade decreases inequality, which is in accordance with classical economic theory. Using a panel data regression on 41 countries over 23 years, this study examines how Gini index interacts as the dependent variable with trade flow and seven control variables. The countries studied are mainly limited to former European colonies with coastal lines to reduce the risk of heterogeneity within the sample. This study finds that trade reduces inequality, although the result should be interpreted with care due to statistically insignificant effects. This study also finds that presence of corruption is of importance when the relationship between trade and inequality is examined.

  • 10.
    Haile, Henok Debessai
    Linköping University, The Tema Institute, Tema Environmental Change.
    Sustainable Phosphorus Management in Sweden: A study of phosphorus recycling from wastewater sludge in several municipalities of the Östergötland County2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Swedish Environmental Agency (SEPA) proposed a national target to increase the rate of phosphorus recycling from wastewater sludge in 2013. Reusing phosphorus from wastewater sludge by spreading it on arable lands raises the risk of contamination and substance deposition in soils. In addition to quantifying the targeted rate of recycling, the proposal has also introduced new thresholds that limit the concentrations of undesired substances in wastewater sludge. This thesis assesses the potential challenges and opportunities in implementing the proposed measure in the Swedish municipality settings. Both qualitative and quantitative data have been gathered from three selected mid-sized Swedish municipalities in the Östergötland County and other data sources. The analytical framework of the thesis is based on the Systems Framework for Phosphorus Recovery and Reuse. Several discrepancies between the national goal to increase phosphorus recycling and local circumstances that affect local decision-making have been identified in this thesis. Reducing the flow of undesired substances into the wastewater stream raises goal conflict and is an enormous challenge which requires regulating the way chemicals are consumed in society. From the policy perspective, the national environmental objectives framework is ambiguous with regards to how local decisions should be directed in line with the national goals. The proposed measure should hierarchically be unequivocal and its implementation needs to be coordinated across all geographical scales. The thesis also highlights that there are significant local opportunities for addressing other sustainability goals through phosphorus recycling measures. Sweden’s commitment to creating a resource-efficient phosphorus cycle affirms that the key for a sustainable phosphorus management is the transformation of path-dependent social and technical systems.

  • 11.
    Jansson, Axel
    et al.
    Linköping University, Department of Management and Engineering, Commercial and Business Law.
    Broman, Elin
    Linköping University, Department of Management and Engineering, Commercial and Business Law.
    Räntebegreppet i inkomstbeskattningen2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In Swedish law, likewise many other Nordic countries’ laws, the term interest is not defined. Due to the absence of a definition, numerous issues have arisen regarding ones taxation in the Swedish taxation law, one of the greatest difficulties being the demarcation between dividends and capital gain. This issue has been debated extensively in juridical literature, and ultimately it has commonly been resolved in case law. Due to the fact that the taxation of interest varies from the taxation of dividend or capital gains, it is of great importance how a cash flow is classified.

    The purpose of this essay is to study the term interest in the Swedish taxation law by illustrating the issues that the lack of a definition has led to and how it may have affected the taxation of income. By investigating this, we have analyzed whether or not a legal definition would be beneficial and desirable. Interest is originally derived from economics, thereby is this aspect essential and interesting to considerate even when studying the legal aspect of it. The economical standpoint may vary from the legal approach. It is therefore of importance to reflect on how the economical term of interest relates to the juridical one.

    When trying to define interest one ought to consider the relationship between taxation and accounting. When studying this correlation, we could conclude that an unequivocal definition of the term interest would be neither beneficial nor desirable. However, when classifying a cash flow as interest, a number of prerequisites could be formulated on the basis of court law and juridical literature. Among these criterions, one of the most essential seems to be the one regarding foreseeability: a rate of return that a creditor receives from a debtor must be predictable to be considered interest.

    It can be established that the question regarding which cash flows may be defined as interest is far more intricate and extensive than this study can show. During the course of this essay, we also came to the conclusion that the question regarding the classification of a cash flow ought to be divided into three different questions: Is it interest? Is it treated as interest? Should the cash flow as a whole or just partly be treated as interest? In this essay, we have approached the two first questions, whereas the third is yet to be discussed.

  • 12.
    Falk, Matilda
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Hedkrok, Sabina
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Coordination of the information and material flow of lego products - A case study at Siemens Industrial Turbomachinery AB2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Studien betraktar informations- och materialflödet för legomaterial på Siemens Industrial Turbomachinery AB i Finspång. Det studerade problemet gäller att det finns en dålig uppfattning bland de anställda om hur flödet och arbetet med lego ser ut, samt dålig kommunikation mellan de inblandade avdelningarna. Genom intervjuer med ansvariga för legomaterialsamt granskning av tidigare dokument har legoflödet kunnat beskrivas. Problematiken på företaget har studerats utifrån teori kring processer och flöden samt kommunikation, integration och koordinering Rapporten presenterar en samordnad bild över arbetet med legomaterial genom en kartläggning med tillhörande flödesschema över informations- och materialflödet för lego inom företaget. I studien har problem med koordination och samarbetet mellan de inblandade avdelningarna identifierats. Rapporten följs upp med förslag på åtgärder och vidare arbete för att lösa problemen.

  • 13.
    Dasander, Carolin
    Linköping University, Department of Social and Welfare Studies.
    En myndighet i förändring: En fallstudie om Lean på Migrationsverkets mottagningsenhet.2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to illustrate how the business philosophy Lean, originating from the Japanese manufacturing industry, has been transferred to The Swedish Migration Agency. In addition to this, I will also look at how the management philosophy New Public Management (NPM) has been introduced in The Swedish Migration Agency´s discourse.

     

    The Swedish Migration Agency is an authority of change and 2015 has so far been an eventful year marked by record high refugee flow in combination with the new organizational structure, alongside with mass recruitment in the organization.

     

    The Lean model gaining ground can be seen as a paradigm shift and a shift from a democratic discourse to a NPM-discourse, where the state had previously been characterized by traditional bureaucracy, but now focuses on efficiency and management by objectives. This development creates a neoliberal effect on the Swedish welfare society, where citizens gradually transforms into consumers.

  • 14.
    Andersson, Erik Olov Mårten
    Linköping University, Department of Computer and Information Science.
    A Gameful Quest to Make Second Language Acquisition Fun2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study explores the application of principles from game design, and the motivational psychology it is founded upon, to the domain of second language acquisition. A gameful design process based on playtesting andanalysis with design lenses is adapted and used to iteratively design and develop a system for conversation practice with the goal of creating a motivating and engaging experience.The results indicate effectiveness of the process, but generalizing the results would require further research with bigger sample sizes and studies with varied core activities.

  • 15.
    Björklund, Emma
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Silfverhjelm, Carolina
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Safety at the construction site2015Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Accidents at the construction site are a usual problem today. Therefore we have chosen to investigate how the safety routine is followed at the company Åhlin & Ekeroth. The routines are compared to the results from a questionnaire study and several interviews. We have chosen to delimitate the study to accidents in the workplace because it is the most common work-related injury.

    The goal with our study is to highlight problems in the working environment at the construction site. The result helped us to come up with suggestions for how to increase the safety and decrease the numbers of accidents.

    To answer our questions we did a questionnaire study, interviews and study visits. We visited four projects in Linköping. We did interviews with the staff management at each project and a questionnaire study with the professional workers. Then we put together the result and compared them to different injunctions, laws and the safety routine at Åhlin & Ekeroth.

    The results show that the company´s routines are good and the problem is that they are not followed at the construction site. The biggest reasons for this is piecework, laziness and the attitude to safety.

    The arrangements we have thought of to improve the working environment are to improve the information flow, arrange activities outside work for increased fellowship. We also believe that the system for piecework needs to be modified.

  • 16.
    Brandt, Anton
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Yngvesson, Christian
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Logistics flow mapping of a new workshop layout at Saab in connection with the installation of a new machine2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Examensarbetet kartlägger en verkstadsavdelning på Saab i Linköping där det i framtiden ska komma att ske en del förändringar kring verkstadslayouten på grund av att en ny maskin ska installeras. Kartläggningen görs dels för att belysa material- och verktygsflöden i verkstaden och undersöka hur dessa påverkas den framtida layoutförändringen. Kartläggningen görs dessutom för att identifiera problem som finns i verksamheten idag och en undersökning utförs kring hur dessa problem påverkas av att en ny verkstadslayout ska införas. Examensarbetet presenterar förbättringsförslag för den nya verkstadslayouten som ska leda till att de identifierade problemen ska undvikas samt underlätta för det framtida material- och verktygsflödet. Rekommendationer ges även kring hur man i framtiden kan arbete med liknande problem.

  • 17.
    Hallberg, Jonatan
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Winninge, Joel
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    In-plant reverse logistics: The reversed flow of steel scrap for reuse at Sandvik Materials Technology2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Syftet med denna studie är att kartlägga flödet av returstål inom SMT för att identifiera eventuella problem samt, om så är fallet, presentera förbättringsförslag för att åtgärda dessa. Kartläggningen visade att ett fåtal produktionsenheter står för majoriteten av returstålet som uppstår inom SMT samt att det överlag föreligger brister i sorteringen. Felsorteringen medför kostnader i form av ökad hantering, minskat materialvärde samt problem vid smältningsprocessen i Stålverket. En av anledningarna till felsorteringen är avsaknaden av återkoppling i form av kostnader och sorteringskvalitet till varje produktionsenhet. Det har via kartläggningen framkommit att transportkostnaderna är låga relativt materialvärdet. Därför är det av vikt att returstålet transporteras till Råvarugården snabbt. Resultatet av denna studie är att returstålsflödet skulle bli effektivare genom förbättrad sortering snarare än genom minskade transportkostnader.

  • 18.
    Dong, Yao
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Sadegh Aminian, Mohammad
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Routing in Terrestrial Free Space Optical Ad-Hoc Networks2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Terrestrial free-space optical (FSO) communication uses visible or infrared wavelengths to broadcast high speed data wirelessly through the atmospheric channel. The performance of terrestrial FSO channel mainly depends on the local atmospheric conditions. Ad hoc networks offer cost-effective solutions for communications in areas where infrastructure is unavailable, e.g., intelligent transport system, disaster recovery and battlefield scenarios. Traditional ad hoc networks operate in the radio frequency (RF) spectrum, where the available bandwidth faces the challenge of rapidly increasing demands. FSO is an attractive alternative for RF in ad-hoc networks because of its high bandwidth and interference-free operation. This thesis investigates the influencing factors for routing traffic from given s-d pair while satisfying certain Quality of Services in terrestrial FSO ad hoc mesh networks under the effect of stochastic atmospheric turbulence. It starts with a comprehensive review of FSO technology, including the history, application, advantages and limitations. Subsequently the principle of operation, the building blocks and safety of FSO communication systems are discussed. The physics of atmosphere is taken into account to investigate how propagation of optical signals is affected in terrestrial FSO links. A propagation model is developed to grade the performance and reliability of the FSO ad hoc links in the network. Based on that model and the K-th shortest path algorithm, the performance of the path with highest reliability, the path with a second highest possible reliability and an independent path with no common links shared with the former two paths, were compared according to the simulation scenarios in node-dense area and node-sparse area. Matlab simulation shows that the short/long range dependent transmission delay are positively proportional to number of hops of the paths. Lower path reliability only dominate the cause of severe delay when traffic flow approaches near its upper link capacity in node-sparse area. In order to route traffic from given s-d pairs with satisfying certain Quality of Services, the path with highest reliability may not be the best choices since they may hold more hops which will degrade the QoS. Meanwhile, in case of exponential traffic congestion, it is recommended that both traffic demand and traffic flow propagating through the links should be pressed below a value close to the effective capacity, where the nonlinearity of the transmission delay curve starts to obviously aggravate.

  • 19.
    Seybold, Christoph
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Calibration of fundamental diagrams for travel time predictions based on the cell transmission model2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Road traffic increases constantly and the negative consequences in the form of traffic jams can be realized especially in urban areas. In order to provide real time traffic information to road users and traffic managers, accurate computer models gain relevance. A software called Mobile Millennium Stockholm (MMS) was developed to estimate and predict travel times and has been implemented on a 7km test stretch in the north of Stockholm. The core of the software is the cell transmission model (CTM) which is a macroscopic traffic flow model based on aggregated speed observations. This thesis focuses on different calibration techniques of the so called fundamental diagram as an important input factor to the CTM. The diagrams illustrate the mathematical function which defines the relation between traffic flow, density and speed. The calibration is performed in different scenarios based on the least square (LS) and total least square (TLS) error minimization. Furthermore, sources, representing the traffic demand, and sinks, representing the surrounding of the modeled network, are implemented as dynamic parameters to model the change in traffic behavior throughout the day. Split ratios, as a representation of the drivers‘ route choice in the CTM are estimated and implemented as well. For the framework of this work, the MMS software is run in a pure prediction mode. The CTM is based on the source, sink, split and fundamental diagram parameters only and run forward in time. For each fundamental diagram calibration scenario an independent model run is performed. The evaluation of the scenarios is based on the output of the model. The results are compared to existing Bluetooth travel time measurements for the test stretch, which are used as ground truth observations, and a mean average percentage error (MAPE) is calculated. This leads to a most reasonable technique for the fundamental diagram calibration – the total least square error minimization.

  • 20.
    Åkeson, Mattias (Artist)
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM. Linköping University, Faculty of Arts and Sciences.
    Den goda viljan2010Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Under åren har den Kulturella sektorn utvidgats till den Kreativa sektorn. Idén om en upplevelsekultur- och till den kopplat en upplevelseindustri - är fastlagd. Inom upplevelsekulturen ryms både konsthallen och köpcentret. Den goda viljan ser på dessa platser, som båda påverkar stadsutvecklingen och jobbar för att locka en publik. Vad finns det för likheter och hur ser man på sig själv och sitt uppdrag? Hur jobbar man för att skapa en attraktiv plats? Hur formas vår individuella och kollektiva identitet av konsumtion, såväl kommersiell som kulturell? Verket är en tredelad videoinstallation där den mittersta filmen visar ett samtal mellan parter från köpcenter och konstinstitutioner. Samtalet leds av Josefina Syssner, som bl. a. har forskat om platsmarknadsföring och regional identitet. Till höger och vänster visas filmklipp från respektive miljöer, köpcentret och konstinstitutionen. De fungerar som fältstudier som understödjer det pågående samtalet.

    Den goda viljan är en filminstallation bestående av en trekanalsfilm och skulpturala objekt. Konstverket gjordes till utställningsprojektet Cash Flow / Konsumera Mera. Ett samarbetsprojekt mellan Botkyrka konsthall och Norrköpings konstmuseum. Inköpt av Norrköpings konstmuseum. 

  • 21.
    Randell, Per
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics. Linköping University, The Institute of Technology.
    Numerical Simulation of Temperature and Velocity Profiles in a Horizontal CVD-reactor2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Silicon Carbide (SiC) has the potential to significantly improve electronics. As a material, it can conduct heat better, carry larger currents and can give faster responses compared to today’s technologies. One way to produce SiC for use in electronics is by growing a thin layer in a CVD-reactor (chemical vapour deposition). A CVD-reactor leads a carrier gas with small parts of active gas into a heated chamber (susceptor). The gas is then rapidly heated to high temperatures and chemical reactions occur. These new chemical substances can then deposit on the substrate surface and grow a SiC layer. This thesis investigates the effect of different opening angles on a susceptor inlet in a SiC horizontal hot-walled CVD-reactor at Linköping University. The susceptor inlet affects both the flow and heat transfer and therefore has an impact on the conditions over the substrate. A fast temperature rise in the gas as close to the substrate as possible is desired. Even temperaturegradients vertically over the substrate and laminar flow is desired. The CVD-reactor is modeled with conjugate heat transfer using CFD simulations for three different angles of the inlet. The results show that the opening angle mainly affects the temperature gradient over the substrate and that a wider opening angle will cause a greater gradient. The opening angle will have little effect on the temperature of the satellite and substrate.

  • 22.
    Lid, Martin
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Spelutveckling med rörelsedetektion, en förbättring av Space Invaders för att skapa flow2015Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [sv]

    I detta arbete har det utvecklats ett spel som varit inspirerat utav spelet Space Invaders. Spelet är skrivet i Javascript och använder sig av ramverket phaser.io 1 . En stor del av utvecklingen har varit att spelet använder en webkamera för att ta emot input för att styra karaktären i spelet. Innan utvecklingen började har jag läst på angående spelutveckling och framförallt det psykologiska begreppet och sinnestillståndet Flow. Sedan har hela spelutveckingsprocessen haft som mål att förbättra Space Invaders så att det blir roligare och sätter spelaren i Flow. Under utveckling av spelet, har mindre tester gjorts av diverse studenter och barn för att få lite direkt input i arbetet. Därefter har jag anpassat utvecklingen efter de observationer som jag gjorde vid dessa tester. Efter arbetet var klart har också en utvärdering av spelet gjorts av mig (utvecklaren), för att göra en egen bedömning av spelet. I den utvärderingen har hänsyn till de olika mål som beskrivs i teorikapitlet tagits. Sen har tester genomförts som varit observerade av mig (utvecklaren). Testpersonerna har efter att de spelat spelet fyllt i formulär för att bestämma hur pass de var inne i flow eller inte, och givit en bättre uppfattning om hur de upplevde de olika delarna i spelet. Efter testerna har resultaten analyserats och presenterats för att hjälpa till vid fortsatt utveckling av spelet, eller för att hjälpa till vid liknande projekt. Vid liknande projekt så innehåller denna rapport mycket nyttig information och iaktagelser. Resultatet av studien visade bland annat på att man genom att implementera nya element i spelet förhöjer spelupplevelsen för spelaren, men på grund av vissa brister i kamerastyrningen hindrade det spelaren från att känna sig helt i kontroll över spelet och därför begränsade det de flow som spelaren upplevde.

  • 23.
    Cronstrand, Rasmus
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Effects of design and feedback in a motion-based game2015Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Movement-based games are becoming more frequent in everyday lives. With easier access to webcams built into laptops and web-based games, a game which utilises both concepts can become a good option for everyday gaming.This study evaluates a movement-based game written in JavaScript using phaser.io which uses a webcam for control and HTML5 technique for capture. The main questions in the study are what observations can be done and are there any problems when developing a game with webcam-based motion-detection in regards to factors like flow, feedback and positioning. This study tries to answer these questions by building upon an existing game and implementing new functions and feedback and then observing how these effect the game-play. The results of the study showed that it is important to consider good feedback and how to position oneself when playing such a game and that more testing should be done to gain further knowledge about these two. But also that many of the implementations done made the person achieve flow while playing. Further work should be beneficial also to make the game even better while keeping it easy to play.

  • 24.
    Desai, Avni
    et al.
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    Widgren, Maria
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    A Collaboration in Product Service System for Telecom Networks: An "Orange and Ericsson case" study2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of the research is to study the “Orange and Ericsson case” while developing the method Actors and System Map. The interaction between actors within Ericsson’s Device Connection Platform is investigated in order to identify improvement opportunities in the interaction between the provider and the customer. To answer the purpose the following research questions was formulated:

    RQ1)  What type of actors may be involved in a telecom related IPSO?

    RQ2)  How can the connections between actors in the telecom related IPSO be illustrated?

    RQ3)  How can the Actors and System Map method be refined?

    In order to answer the research questions different methodologies were used for the analysing process. The research started with a widespread literature study to collect knowledge related to the area of Product Service System (PSS) and methodologies for identifying how actors interact with one another. Studying different mapping methods the conclusion was made that Actors and System Map was most suitable for this study.

    In the methodology background the previous selected method, Actors and System Map from an Integrated Product Service Offering (IPSO) perspective, was examined in order to be able to refine and improve the mapping method. Actors Map provides a visual and clear overview of the actors involved while a System Map shows the information flows and activities between the actors.

    To understand the interaction between the two companies, the definition of IPSO and the importance of value-based selling for a service offering are described in the theory background. Also, different ways of looking at a business model within the telecommunication industry is presented.

    Obtaining information regarding making an Actors Map and a System Map an improved mapping method was refined. The adaption of the method was divided into eight steps. The refined Actors Maps of the DCP shows the actors involved, how they are connected and their main assignments from each respondent’s point of view at Ericsson. The refined System Map shows what kind of information is transferred between the actors within the companies and between Orange and Ericsson. Both maps delivered as a decision basis will help identification of non-value giving links and non-optimal distances in the information flow for both companies.

  • 25.
    Khan, Muhammad Awais
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    A Study on the Aliasing-image Problem in I/Q Modulators Employing RF-DACs2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In today’s world of high-speed communication, data-converters are playing a vital role. The purpose of this project is to analyze the aliasing image problem that occurs in quadrature I/Q modulators utilizing radio frequency digital-to-analog converters (RF-DACs). The RF-DAC is considered to be high-speed DAC that operates in higher GHz region. These high performance DACs are becoming the most essential part of the upcoming future communication devices like next generation radars and telecommunication systems. Some I/Q modulators are implemented in this thesis. The aim is to identify the unwanted signal that is trying to distort the desired output.

    In this thesis, the work is divided into two main parts. First is the aliasing image verification and second is the implementation of the I/Q modulators. Begin with the assessment of the aliasing image through sketching the spectrum using Matlab tools. Also mathematically the calculation is derived to support the flow. In the next part, four different architectures are implemented focusing on image rejection ratio (IRR) calculation while the maximum achievable rejection ratio is 119 dB using the RF-DAC. Lastly the effect of discrete local oscillation (LO) is shown. A comparison plot is drawn, comparing the effect of a discrete-LO at different bit levels vs. IRR variation. It shows a nice picture of IRR dependence on the perfect matching and not on the signal shaping. 

  • 26.
    Nordgren, Madeleine
    Linköping University, Department for Studies of Social Change and Culture. Linköping University, Faculty of Arts and Sciences.
    Förändringar är till det bättre... eller?: En intervjustudie om kommunikationsförändringar på ett teknikkonsultföretag -ur ett ledarperspektiv2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To lead is to communicate, a main part of the leadership. 80 % of leaders working tasks involve communication of some kind. The ambition of this study is to analyze how four leaders of an international technique consulting company experience and handle community and technical development during their professional courses. The leaders have a various experience of leadership which adds depth and width to this study. To perform the study qualitative method has been used in the form of personal interviews.

    The result indicates that change is not always beneficial in every aspect of communication. To manage the quantity of information and communication we must learn how to sort. However these communication channels are an important part of being able to connect within and without the organization. When and how to use them are keywords in order to being able to cope with the flow of information.

  • 27.
    Yaochuan, Chen
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, The Institute of Technology.
    Binary Instruction Format Specification for NoGap2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Nowadays, hardware designers want to get a powerful and friendly tool to speedup the design flow and design quality. The new development suit NoGap is pro-posed to meet those requirements. NoGap is a design automation tool for ASIP,it helps users to focus on the design stage, free them from module connection andsignal assignment, or integration. Different from the normal ADL tools which limitusers’ design ideas to some template frameworks, NoGap allow designers to im-plement what they want with NoGap Common Language (NoGapCL). However,NoGap is still not perfect, some important functionalities are lacking, but withthe flexible generator component structure, NoGap and NoGapCL can easily beextended.This thesis will firstly investigate the structure of Novel Generator of Acceler-ators and Processors (NoGap) from software prospective view, and then present anew NoGap generator, OpCode Assignment Generator (OpAssignGen), which al-lows users to assign operation code values, exclude operation codes and customizethe operation code size or instruction size.A simple example based on the Microprocessor without Interlocked PipelineStages (MIPS) instructions sets will be mentioned to give users a brief view ofhow to use OpAssignGen. After that, the implementation of the new generatorwill be explained in detail.What’s more, some of NoGap’s flaws will be exposed, but more suggestionsand improvements for NoGap will be given.At last, a successful synthesis result based on the simple MIPS hardware im-plementation will be shown to prove the new generator is well implemented. Moreresults and the final conclusion will be given at the end of the thesis.

  • 28.
    Prasad Rao Pasupuleti, Krishna
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Investigation and Study of Crosstalk2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Crosstalk is defined as an unwanted coupling between the conductors. By this it is meant that signals from one of the signal conductors (a generator in this case) are coupled to another signal conductor (receptor), or conductors (receptors), depending on the number of conductors in the vicinity of the generator. Crosstalk in this way affects the signal level on the receptor and thereby affects the total system performance within the system. This can happen in several ways, one of which is through edge coupling. Edge coupling is a process where two signal conductors are placed beside each other in the same layer while the ground conductor could have been placed either under these conductors, in a separate layer like Mclin (Microstrip coupled lines) and Sclin (Coupled striplines), or beside the signal conductors as in Cpwcpl2 (Coplanar wave guide coupled lines). This then means that edge coupling occurs through the sides where the generator and the receptor are facing each other. Broadside coupling is another way, where it occurs when the signal conductors are broadside faced to each other in different layers with reference planes above and below these signal conductors. Coupling of the signals from the generator to the receptor can occur through capacitive coupling or inductive coupling. Capacitive coupling, also known as electrical coupling, occurs due to the difference in the characteristic impedance of the generator (usually 50 or 100 §Ù) and its heavy load (1 k§Ù or more) which results in high voltage difference between the generator and the reference conductor (ground). This leads to the creation of a charge across the generator and the receptor-facing sides and finally results in the electric field coupling between them. On the other hand, inductive coupling, also known as magnetic coupling, occurs when the load is less than the characteristic impedance of the generator, and this thereby results in a heavy current flow through the generator which in return results in a strong magnetic field around itself and so leads to magnetic coupling to the receptor. The aim in this thesis is to measure both the capacitive and inductive coupling load¡¯s impacts on both the edge coupling and the broadside coupling models through crosstalk on the receptor. This thesis starts with the background and corresponding theory and equations to the crosstalk coupling. Later on it tests both the edge- and broadside coupling models with different physical properties exploitation. Inductive and capacitive loads are used to measure the resulting crosstalk coupling. Particularly to see the effect of capacitive and inductive coupling in reality in multi layered PCB, a Sbclin (Broadside coupled striplines) model has been used with different angular placement of the generator. Finally mclin physical models are compared with the simulated models and corresponding differences are discussed. It can be concluded that crosstalk effect increases or decreases with physical properties exploitation. Crosstalk also increases with the wrong termination of the load.

  • 29.
    Hildebrand, Cisilia
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Hörtin, Stina
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    A comparative study between Emme and Visum with respect to public transport assignment2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Macroscopic traffic simulations are widely used in the world in order to provide assistance in the traffic infrastructure development as well as for the strategic traffic planning. When studying a large traffic network macroscopic traffic simulation can be used to model current and future traffic situations. The two most common software used for traffic simulation in Sweden today are Emme and Visum, developed by INRO respective PTV.

    The aim of the thesis is to perform a comparison between the software Emme and Visum with respect to the assignment of public transport, in other words how passengers choose their routes on the existing public transport lines. However, in order to make a complete software comparison the run-time, analysis capabilities, multi-modality, capacity to model various behavioural phenomena like crowding, fares etc. this will not be done in this comparison. It is of interest to study the differences between the two software algorithms and why they might occur because the Swedish Transport Administration uses Emme and the Traffic Administration in Stockholm uses Visum when planning public transport. The comparison will include the resulting volumes on transit lines, travel times, flow through specific nodes, number of boarding, auxiliary volumes and number of transits. The goal of this work is to answer the following objective: What are the differences with modelling a public transport network in Emme and in Visum, based on that the passengers only have information about the travel times and the line frequency, and why does the differences occur?

    In order to evaluate how the algorithms work in a larger network, Nacka municipality (in Stockholm) and the new metro route between Nacka Forum and Kungsträdgården have been used. The motivation for choosing this area and case is due to that it is interesting to see what differences could occur between the programs when there is a major change in the traffic network.

    The network of Nacka, and parts of Stockholm City, has been developed from an existing road network of Sweden and then restricted by "cutting out" the area of interest and then removing all public transportation lines outside the selected area. The OD-matrix was also limited and in order not to loose the correct flow of travellers portal zones was used to collect and retain volumes.

    To find out why the differences occur the headway-based algorithms in each software were studied carefully. An example of a small and simple network (consisting of only a start and end node) has been used to demonstrate and show how the algorithms work and why volumes split differently on the existing transit lines in Emme and Visum. The limited network of Nacka shows how the different software may produce different results in a larger public transport network.

    The results show that there are differences between the program algorithms but the significance varies depending on which output is being studied and the size of the network. The Visum algorithm results in more total boardings, i.e. more passengers have an optimal strategy including a transit. The algorithms are very similar in both software programs, since they include more or less parts of the optimal strategy. The parameters used are taken more or less into consideration in Emme and Visum. For example Visum will first of all focus on the shortest total travel time and then consider the other lines with respect to the maximum waiting time. Emme however, first focuses on the shortest travel time and then considers the total travel time for other lines with half the waiting time instead of the maximum wait time. This results in that less transit lines will be attractive in Emme compared to Visum. The thesis concludes that varying the parameters for public transport in each software algorithm one can obtain similar results, which implies that it is most important to choose the best parameter values and not to choose the "best" software when simulating a traffic network.

  • 30.
    Lagervall, Malin
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Samuelsson, Sandra
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Microscopic Simulation of Pedestrian Traffic in a Station Environment: A Study of Actual and Desired Walking Speeds2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In order to attract pedestrians to travel with public transport instead of private cars, the layout of interchange stations is important and should be designed in an effective way. Microscopic simulation of pedestrians can be used to evaluate different layout scenarios or a future increase in flow. The simulation software Viswalk was investigated, where the movements of pedestrians are based on a social force model,. The purpose of this thesis was to investigate simulated walking speeds for different flow levels and to investigate the effects of dividing pedestrians into types with different desired speeds. The aim was to find a desired speed distribution that can be used for different flow levels. Field studies have been performed to collect pedestrian traffic data with a video camera at Stockholm Central Station. Two disjoint flow levels were identified and used to investigate if the same desired speed distribution could be used for different flow levels. The average observed walking speed was 1.33 metres per second at the low flow level and 1.25 metres per second at the high flow level. The error was 4.5 percent between the average observed walking speed and the average simulated walking speed when the optimal desired speed distribution at the low flow level was used at the high flow level. Effects of using different desired speed distributions for different pedestrian types have also been investigated. The error between the average of the observed and the simulated walking speeds varies between 2.3 and 4.1 percent when dividing pedestrians into different types when the optimal desired speed distributions at the low flow level are used at the high flow level. A sensitivity analysis of some parameters of the social force model in Viswalk has also been performed. Several adjustments of the parameters show that some parameters had great impact of the simulated walking speeds. The final conclusion is that the parameter configuration and how the pedestrians are divided into different types affect the average simulated walking speed.

  • 31.
    Athanasiou, Vasileios
    Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Faculty of Health Sciences.
    Estimation and modelling of fMRI BOLD response2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One of the current topics of research in neuroimaging techniques is related to explaining and modelling the Blood Oxygen Level Dependent (BOLD) responses. BOLD responses are estimated by processing functional Magnetic Resonance Imaging (fMRI) data. BOLD responses are caused by hemodynamic responses to neural activity which alter the levels of blood oxygenation at local brain regions. The main aims of the current thesis were to i) develop and examine methods regarding BOLD response estimation from the visual cortex and the frontal cortex of human brain and to ii) develop a model in order to explain the physiological mechanisms which cause the estimated BOLD responses.

    In order to satisfy the main aims, fMRI data were provided by the Center of Medical Imaging and Visualization (CMIV). The provided fMRI data consist of fMRI brain measurements of twelve healthy human subjects who were subjected to visual stimulation. By processing the fMRI data, Regions Of Interest (ROIs) were extracted at the anatomical sites of the visual cortex and the frontal cortex. Afterwards, the fMRI data were manipulated in order to extract BOLD responses from the visual cortex and the frontal cortex. Various methods were developed and compared in terms of which technique provided well representative BOLD responses.       

    Subsequently, a model was developed by using software Wolfram Mathematica 9 in order to explain the physiological mechanisms of the estimated BOLD responses at the visual and the frontal cortex. The model aimed to solve for oxygen concentration in blood plasma as blood flows from the arterial part to the venous part of the blood circulation system through a capillary. Oxygen outward diffusion through the capillary wall and oxygen concentration at the extravascular environment were modelled as well. Blood plasma oxygen concentration was turned into hemoglobin oxygen saturation (Sa ) through hemoglobin oxygen dissociation curve and Henry’s law for gases. As a result, the Sa  was estimated through modelling for oxygen concentration in blood plasma. Finally, the developed model ended to a system with input the fractional change of Cerebral Blood Flow (CBF) velocity and Cerebral Metabolic Rate of Oxygen (CMR ) and as output a proportional signal to the BOLD response. By simulating for different scenarios of fractional changes of CBF velocity and CMR  and by comparing the resulted BOLD responses to the estimated ones, it was attempted to explain for the physiological mechanisms which caused the BOLD responses at the anatomical sites of the visual and frontal cortex.

  • 32.
    Prabahar, Jasila
    Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
    Localization of Stroke Using Microwave Technology and Inner product Subspace Classifier2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Stroke or “brain attack” occurs when a blood clot carried by the blood vessels from other part of the body blocks the cerebral artery in the brain or when a blood vessel breaks and interrupts the blood flow to parts of the brain. Depending on which part of the brain is being damaged functional abilities controlled by that region of the brain is lost. By interpreting the patient’s symptoms it is possible to make a coarse estimate of the location of the stroke, e.g. if it is on the left or right hemisphere of the brain. The aim of this study was to evaluate if microwave technology can be used to estimate the location of haemorrhagic stroke.

    In the first part of the thesis, CT images of the patients for whom the microwave measurement are taken is analysed and are used as a reference to know the location of bleeding in the brain. The X, Y and Z coordinates are calculated from the target slice (where the bleeding is more prominent). Based on the bleeding coordinated the datasets are divided into classes. Under supervised learning method the ISC algorithm is trained to classify stroke in the left and right hemispheres; stroke in the anterior and posterior part of the brain and the stroke in the inferior and superior region of the brain. The second part of the thesis is to analyse the classification result in order to identify the patients that were being misclassified.

    The classification results to classify the location of bleeding were promising with a high sensitivity and specificity that are indicated by the area under the ROC curve (AUC). AUC of 0.86 was obtained for bleedings in the left and right brain and an AUC of 0.94 was obtained for bleeding in the inferior and superior brain. The main constraint was the small size of the dataset and few availability of dataset with bleeding in the front brain that leads to imbalance between classes. After analysis it was found that bleedings that were close to the skull and few small bleedings that are deep inside the brain are being misclassified. Many factors can be responsible for misclassification like the antenna position, head size, amount of hair etc.

    The overall results indicate that SDD using ISC algorithm has high potential to distinguish bleedings in different locations. It is expected that the results will be more stable with increased patient dataset for training.

  • 33.
    Skarphagen, Richard
    et al.
    Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
    Suu, Albin
    Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
    Utveckling av prototyp för utläsning av sensorvärden från enkortsdator via NFC2014Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The use of phone to check if you are sick or not has just begun, one example of this is that Apple recently released its new ios that contains the app “Health” where you can check how many steps you have taken on a day, check your pulse rate or how many calories you have burnt during the day.

    We simply want to check our health at home with ease so we don’t have to go to the hospital, this requires that our product has to be small and cellpowered and of course cheap.

    This report describes our examwork where we investigate if we can build a blood flow measurement/measuring prototype, it has to be cheap, cellpowered, small and it must have theability to send its information via the protocol NFC.

    We were given a Raspberry Pi, this to keep the price down, and for the NFCsending issue wehad to use Androidphones/tablets with NFC on them. To reach the goal we had to program the Raspberry Pi in C to take care of the information, and make an app for Android in Java that reads the information wirelessly and can show the information on display.

    Late in the project we noticed that our ADC couldn’t handle the probe, wich made us unable to realise the blood flow probe measurements. Therefore our finished product is not the complete product we were hiping for.

    We had to change the probe to a IRdistance sensor, wich we chose because then we would still be able to show that we can send information from a sensor via ADC to Raspberry Pi and then to the phone/tablet.

    Our finished product became a small, cheap and cellpowered distance measurer. This showed us that we have the knowledge to make a small, cheap and cellpowered hospital gear.

    In the future there are big possibilites with what you can do with this  technique for example, check for disease, blood flow, lung capacity just by reading via moving your phone over for example a watch.

  • 34.
    Ring, Emma
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
    Modelling a piezoelectric-driven actuator for active flow control2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Flow control is an area of research of particular interest within automotive and aerospace industries since methods used to affect the fluid flow around vehicles can reduce drag and therefore lower their fuel consumption. One of these methods, which has generated a lot of interest in later years, is called active flow control and uses different types of actuators to impact the surrounding flow.

    In this thesis a model of a piezoelectric actuator for active flow control has been developed using Lumped Element Modelling and equivalent circuits. This approach, together with the chosen software for implementation, Simulink, provides models which are easy to simulate and evaluate.

    The actuator model has been validated using a novel methodology with sub-models with the purpose of reducing computational costs. The actuator is therefore divided into two submodels,one for structural and one for fluid dynamics, which are validated separately. This enables the use of simple yet accurate FEM and CFD models instead of time consuming FSI software which the complete model requires.

    The three implemented models have been validated using cases presented in previous studies and data from CFD-simulations. The results show that the decoupled models can be validated separately and its results can be integrated into the complete model, although further tests with a real actuator is needed.

    In addition to the modelling, a parameter study of the actuator has been performed in order to prepare for prototype design.

  • 35.
    Bygdén, Johan
    et al.
    Linköping University, Department of Management and Engineering, Quality Technology and Management. Linköping University, The Institute of Technology.
    Johansson, Henrik
    Linköping University, Department of Management and Engineering, Quality Technology and Management. Linköping University, The Institute of Technology.
    Värdeflödesanalys i processindustri med kontinuerlig tillverkning: Fallstudie på Billerud Korsnäs AB Skärblacka2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Lean production is a philosophy which purpose can be simplified as: Produce more products with the usage of fewer resources by eliminating waste in the system. At the beginning it was part manufacturing companys who started using the different techniques within lean but in recent years lean has been widespread and applied in service organizations like health care for example. The development of lean against the process industries has however been slower which implies that the companys within that industry still have a lot to learn when it comes to lean. Some critics argue that the possibilities of applying lean techniques in the process industries are limited. Others claim that you just need a different approach and that the lean methods might need to be adjusted so that the conditions of the industry are considered.

    When the main purpose of lean is to eliminate waste from the system there is a generally accepted method called value stream mapping (VSM). The method is used in order to map the material- and information flow and hence identify the waste existing in the system. There is a limited amount of literature considering the applicability of this method in the process industry, whereupon this study comes in handy. This master thesis was carried out as a case study at BillerudKorsnäs Skärblacka’s craft paper production and the purpose is to investigate how VSM can be applied at this type of production in order to eliminate waste. The study resulted in a description of the conditions necessary for the method to be used successfully, how the distinctive characteristics of the process industry affect the implementation of the method and which modifications that needed to be done.

    When the material- and information flow was mapped a number of problem areas were identified where the waste in the system was revealed. It was then detected that the biggest focus should be on the material flow and the production equipment. The identified problem areas lead to a number of improvement suggestions whose purpose is to decrease the amount of waste in the system. Recommendations were also proposed, discussing how the company henceforth can work iteratively with value stream mapping as a part of a process with continuous improvements.

    After the method was carried out conclusions could be drawn. The applicability of the method was considered as good due to problem areas and waste was identified and presented in a lucid way. Though, the data collection and calculation of the included parameters were very time-consuming. The reasons for that were that this was the first time the method was used at the company and the fact that all the data was stored in different systems. With continued mappings of the value stream the data collection and calculation will be less time-consuming parts due to all the formulas are already specified and lessons can be learned from the performance of this study. Due to the fact that radical changes of layout or flow pattern are hard or even impossible to carry out in this kind of industry the main focus of the VSM should be the mapping where the purpose is to identify existing problems and wastes. Hence the output from this method could be foundation for future investments and improvements.

  • 36.
    Lagerquist, Nicklas
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Discrete vortex switching in nonlinear optical waveguides2013Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    In this diploma work a discrete cubic nonlinear Schrödinger equation (DNLS) is used as a model for the evolution of the electric field in a system of coupled waveguides with nonlinear index of refraction.The DNLS is inferred from Maxwell’s equations by expanding the induced charge polarization in a power series, thereby perturbing a single electromagnetic mode. The properties of the model are then derived form a stationary action principle, of particular interest is the construction of a continuity equation and thereby a power flow J between the sites. For systems with periodic boundary conditions there exist so-called vortex solutions with J circulating over the sites. Numerical experiments in the 6-site system are then carried out to investigate the behavior of the current when a vortex solution is perturbed to see whether this could result in a reversed current (vorticity). When a large perturbation was applied to a vortex solution near the limit of linear stability a "vortex breather" solution with a sinusoidally flowing current was found.

  • 37.
    Kemperyd, Emmeline
    et al.
    Linköping University, Department of Management and Engineering, Quality Technology and Management. Linköping University, The Institute of Technology.
    Mideklint, Susanne
    Linköping University, Department of Management and Engineering, Quality Technology and Management. Linköping University, The Institute of Technology.
    Modifying Lean Production for Implementation in Production of Digital, Customized Products2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Purpose

    To evaluate how lean production should be modified to be suitable for implementation in the production of digital, customized products and how the first phase of this implementation can be conducted.

    Research Questions

    RQ1: What constitutes waste when producing digital, customized products, and to what extent can the waste be eliminated?

    RQ2: Which lean concepts and tools are suitable to apply in the production of digital, customized products?

    RQ3: What steps are necessary for initial implementation of lean production for production of digital, customized products, and how should they be prioritized?

    Methodology

    The empirical findings are the result of a single case study focused around in-depth analysis and understanding of concepts and relationships. The data is collected through interviews work shops and observations during a period of three months.

    Conclusions

    RQ1: The types of waste are; Waiting, Transportation, Over processing or incorrect processing, Excess inventory, Unnecessary efforts, Defects and Unused employee creativity. Waste are further classified as removable, non-removable and in some instances necessary.

    RQ2: Unsuitable concepts: Value stream mapping (varying level of unsuitability), Kaikaku, Just in time, Stopping the

     line (without modifications) and Physical visual controls. Redundant concept: Pull. Especially suitable concepts: 5 Why, Decentralized responsibility, Digital visual controls and Isolating variation. Suitable concepts: Elimination of waste, Root cause analysis, Genchi genbutsu, Kaizen events, Flow, Stopping the line (with modifications) and Standardization.

    RQ3: Step I: Aligning the production strategy and process with the organization’s strategy and goals. Step II: Standardization.

  • 38.
    Perkiö, Mattias
    Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
    Assessment of Pulse Wave Velocity in the Aorta by using 4D Flow MRI2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this master thesis was to evaluate the estimation of pulse wave velocity (PWV) in the aorta using 4D flow MRI. PWV is the velocity of the pressure wave generated by the heart during systole and is a marker of arterial stiffness and a predictor of cardiovascular disease (CVD). PWV can in principle be estimated based on the time (travel-time) it takes for the pulse wave to travel a fixed distance (travel-distance), or based on the distance the pulse wave travels during a fixed time. In the commonly used time-to-travel-a-fixed-distance approach, planes are placed at two or more locations along the aorta. The travel-time is found by studying velocity waveforms at these pre-defined locations over time and thereby by estimating the time-difference for the pressure wave to reach each of these locations. In the distance-travelled-in-a-fixed-time approach, the pulse wave is located by studying at the velocity along the aorta at pre-defined instances in time. The travel-distance for the pulse wave between two instances in time is set as the difference in location of the pulse wave, where the location is identified as the location when the velocity has reached a predefined baseline. The specific aims of this thesis was to investigate the effect of using multiple locations as well as the effects of temporal and spatial resolution in the time-to-travel-a-fixed-distance approach, and to evaluate the possibility of using the distance-travelled-in-a-fixed-time approach. Additionally, the possibility of combining the two approaches was investigated. The study of using multiple locations revealed that more planes reduces the uncertainty of PWV estimation. Temporal resolution was found to have a major impact on PWV estimation, whereas spatial resolution had a more minor effect. A method for estimating PWV using 4D flow MRI using the distance-travelled-in-a-fixed-time approach was presented. Values obtained were compared favourably against previous findings and reference values, in the case of healthy young volunteers. The combination of the time-to-travel-a-fixed-distance and distance-travelled-in-a-fixed-time approaches appears feasible.

  • 39.
    Palomeque, Carlos
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Real-Time Visualization of Construction Equipment Performance2014Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis is a proof-of-concept project that aims at modify and reuse existing communication protocols of wireless vehicle to vehicle communication in order to build a prototype of a real time graphical application that runs in an embedded environment. The application is a 2D visualization of the flow of material at a quarry and is built on top of existing communication protocols that enable wireless vehicle to vehicle communication according to the 802.11p standard for intelligent transport solutions. These communication protocols have already been used within the Volvo group in other research rojects, but not in a context of a real-time graphical 2D visualization. The application runs on an ALIX embedded motherboard and combined with the necessary hardware represent one node that makes the communication network. The visualization monitors the position of every active node in the network and the flow of material between material locations and crusher that process the material at the quarry. The visualization is implemented in C/C++ using Qt 4.6.2 Graphics View framework.

  • 40.
    Bergqvist, Joakim
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Runn, Joel
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Relations between speed and flow for sparse 2+1 roads2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    För att besluta vilken vägtyp som ska byggas är det viktigt att Trafikverket har bra underlag. Ett viktigt sådant underlag är så kallade hastighetsflödessamband. Sambanden visar hur trafikflödet påverkar hastigheten på vägen och kan användas för att skapa en bild över vilka trafiksituationer som kan förväntas. För så kallade glesa 2+1-vägar, där endast 15-35 % av vägens totala längd är tillgänglig för omkörning, är problemet att det saknas empiriska observationer för hur flödet påverkar hastigheten vid höga flöden. För att förbättra trafiksäkerheten byggde dåvarande Vägverket ut 2+1-vägar på ett flertal platser i landet. På platser där trafiken är låg har glesa 2+1-vägar byggts istället för konventionella 2+1-vägar, där andel omkörbar längd är större. I och med att trafiken på glesa 2+1-vägar ofta är låg skapas inte trängsel i lika stor utsträckning. Om det i framtiden skulle bli ökningar av trafikvolymerna på dessa vägar innebär det att Trafikverket i dagsläget saknar information för att svara på vilken hastighet ett visst flöde leder till på de glesa 2+1-vägarna. Därför ligger det i intresse att undersöka hastighetsflödessambandets form fram till kapacitetstaket för dessa vägar. Syftet med detta arbete har varit att undersöka hur hastigheten på glesa 2+1-vägar påverkas av olika flödesnivåer på vägen. På Statens Väg- och Transportforskningsinstitut (VTI) finns ett simuleringsverktyg som är anpassat för simulera trafiksituationer på olika typer av landsvägsutformningar. Detta verktyg, RuTSim, har använts för att simulera fram data på hastigheten vid olika trafikflöden. Simuleringarna har genomförts för en typ av landvägsutformning, nämligen en rak mötesfri landsväg med hastighetsgräns 100 km/h. Detta har genomförts både för typiska glesa 2+1-vägar baserade på verkliga vägar, och fiktiva experimentvägar. För experimentvägarna har tre parametrar valts att förändras mellan scenarierna; andel tunga fordon (10 och 15 %), antal omkörningsfält (ett, två och tre) och andel omkörbar längd (20 och 30 %). Totalt har tolv olika scenarier undersökts. Simuleringsresultaten visar att det råder små skillnader mellan de olika alternativa vägutformningar och trafiksammansättningar som har undersökts. Det alternativ som har genererat minst medelfördröjning av undersökta är scenariot med tre omkörningsfält, 30 % andel omkörbar längd och 10 % tunga fordon. Dessutom har det visat sig att andel tunga fordon är den faktor som påverkar medelreshastigheten och medelfördröjningen mest. De hastighetsflödessamband som Trafikverket använder sig av ligger generellt sett högre än de samband som framtagits via trafiksimulering. Vidare arbete behövs därför för att bekräfta denna skillnad. Dessutom behöver effekten av fler alternativa utformningar och andra hastighetspåverkande faktorer undersökas.

  • 41.
    Kallaste, Piia
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Larsson, Jonna
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Tid- och flödesanalys av undersköterskors arbetsuppgifter. En studie om patienttid, arbetsfördelning och utformning av en vårdavdelning2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Undersköterskors arbetsuppgifter inkluderar vård av patienter och hantering av servicesysslor. Hantering av servicesysslor samt förflyttningar på vårdavdelningen upptar en väsentlig del av en undersköterskas arbetstid. Denna studie kartlägger undersköterskors roll på en vårdavdelning på Vrinnevisjukhuset i Norrköping, Sverige. Studien analyserar hur undersköterskor fördelar sin tid mellan olika aktiviteter samt utformningen på hur en framtida utbyggnad på vårdavdelningen kan tänkas utformas. Metoder som användes var tidtagning med stoppur, kostnadsberäkningar, simuleringsmodell samt intervjuer inom relevanta yrkesområden.

    Studien erhåller en kartläggning över hur nuläget ser ut för undersköterskor på en vårdavdelning. Här har tider för varje aktivitet som utförs av undersköterskor inkluderats. Varje aktivitet är uppdelad i kategorier indirekt/direkt vårdkontakt, servicesysslor, personalrum och gångtid. Syftet med kartläggningen är att kvantitativt belysa tidsdistributionen för yrkesrollen undersköterska.

    Studien presenterar utvärdering av servicesysslor samt ett flertal alternativ gällande hantering av servicesysslor. Utgångsläget för hantering av servicesysslor är att undersköterskor sköter dessa eller att inhyrd tredje partner tar över hanteringen. Alternativen utreds med hjälp av kostnadsberäkningar och argumenterande för- och nackdelar. Syftet är att observera det bästa utfallet gentemot kostnadseffektivitet.

    Alternativa framtida utformningar av avdelningen har gjorts med hjälp av  en simuleringsmodell. Modellen är uppbyggd efter datasammanställningen från nuläget, där modellen presenterar den mängd tid som är fördelad på respektive aktivitet samt den tid som läggs på att gå mellan olika rum på vårdavdelningen under en dag. Syftet med modellen är att finna en struktur på avdelningen som ger minskade förflyttningstider. Tre olika scenarion skapas för detta syfte.

    Studien presenterar ett tredelat resultat. Första resultatet som  presenteras är tidsdistrubutionen för undersköterskor. Kartläggningen visar att hälften av tiden läggs på indirekt/direkt vårdkontakt, 13 procent på servicesysslor, 28 procent i personalrummet och 9 procent av tiden läggs på att gå.

    Kostnaderna för att anställa en till undersköterska eller hyra in VNS hamnar på 27 000 kronor kontra 21 000 kronor. Förslaget är att hyra in en tredje partner för hantering av servicesysslor. Detta grundar sig på att detta är det lägre kostnadsalternativet samt för att bland annat hålla ner lagerföringskostnader och strukturera upp skötseln av servicesysslorna.

    Alla tre scenarion i simuleringsmodellen ger ett bättre utfall än nuläget gentemot hur mycket som läggs på gång samt hur många aktiviteter som hinns genomföras. Det tredje scenariot ger det bästa utfallet med en ökning på patienttiden med tre procent, gångtiden reduceras med 0.5 procent och antal aktiviteter som hinns utföras under en dag ökas med 27 stycken.

  • 42.
    Olsson, Joel
    et al.
    Linköping University, Department of Management and Engineering, Solid Mechanics.
    Lindholm, Jim
    Linköping University, Department of Management and Engineering, Solid Mechanics.
    Statisk hållfasthetsanalys av bärplansstag2014Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    In the course TMMT06, Mechanical engineering – project course, a mandatory project is carried out in a group, while a bachelor’s degree work is, in unison, carried out in pairs. The project, which in this case is shared by three pairs, aim to investigate the dimensioning of hydrofoils and their performance. This document is part of one of those bachelor’s degree works, and is focused on a static structural analysis of hydrofoil support struts under the influence of lift and drag forces.

    The goal with this work is to create a construction foundation to be used in the shared project. The aim of the work is to find guidelines for the selection of strut and hydrofoil assembly angles, as well as strut dimensions, depending on the size and shape of the hydrofoil.

    With the use of generally established equations for lift and drag forces, and data for hydrofoils the forces and stresses crucial to the dimensioning of the strut cross-section and assembly angles are analyzed.

    Two streamlined struts, thickness 15 mm and width 100 mm, with the hydrofoil section design Eppler 818 mounted, are studied in a static structural case without dimensioning for unexpected events, such as collisions. Within the span of velocities that are probable for a boat it was found that there never occurs any danger of buckling. Within the same span, plastic deformation does not occur either, although the stress is high enough that the safety margin is relatively small.

    The danger of buckling does not increase as the assembly angles are changed from a perpendicular position, and buckling ceases to be a factor for angles of attack lower than −4°. The stresses and the risk for plastic deformation, however, can increase as the assembly angles deviate from perpendicularity. By making the struts bigger, the construction will be able to use more demanding assembly angles, but to have anything but perpendicular struts is to be avoided. The analysis also shows that the boat should not be allowed to pitch more than 6° at high speeds to avoid large stresses in the struts.

    The largest dimensioning stress in a strut acts at the connection point with the hull or with the hydrofoil. In order to minimize the total thickness of the strut, and thus lowering the drag, it can be made thicker at the connection points while keeping it thin otherwise. The analysis also shows that an increase in strut cross-section area will give large positive outcomes in terms of safety margins against buckling and deformation.

    Eppler 818 was the only hydrofoil studied during the analysis, but the results provide good guidelines for construction of support struts in regards of strength.

  • 43.
    Andersson, Emelie
    et al.
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Yngve, Karolina
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Lust och motivation i textilslöjden: utifrån lärares och elevers uppfattningar2013Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta examensarbete är att synliggöra vilka uppfattningar lärare och elever har om lust och motivation i textilslöjden. Forskning visar att slöjd upplevs som ett lustfyllt ämne och att lustfyllda situationer påverkar elevers inlärning och utveckling positivt. Frågeställningarna i detta examensarbete syftar därför till att synliggöra lärares och elevers uppfattningar om lustens roll i textilslöjdundervisning, orsaker till lust och motivation samt strategier för att skapa lust och motivation i textilslöjden.

    För att svara på dessa frågor har en undersökning med kvalitativ ansats utförts. Intervjuer med fyra lärare och fem elever på skolor i grundskolans senare år och på gymnasiet har analyserats och resulterat i flera kategorier som visar på lärares och elevers uppfattningar.

    Dessa kategorier beskriver uppfattningar kring lustens och motivationens roll i textilslöjdundervisning. De intervjuade menar att lust gör det lättare att lära sig. Variationen av praktisk-estetiska och teoretiska ämnen skapar lust och motivation. I lustfylld textilslöjdundervisning driver elever arbetet framåt själva, de har stort medbestämmande, arbetet flyter på och de klarar av utmaningar. Orsaker till lust och motivation är inspiration, inflytande, intresse, problemlöning, görandet, visionen av en produkt, att få med sig något hem, att bli nöjd med resultat, att ha kontakt med andra, och en kunnig lärare. När lust och motivation saknas används strategierna att ta en paus, att sätta igång fast man inte har lust, hitta lust och motivation själv, att söka eller ge hjälp samt att vara positiv.

  • 44.
    Bjärkmar, Sofia
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Datainsamling till varuflödesstatistik2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Authorities among the transport sector, researchers and consultants use statistics of goods for different purposes. The infrastructure of how, for example, roads, terminals and ports are utilized can be described using this statistics. The flow of goods statistics lacks information about the entire transport chains for goods. The purpose of this thesis was to examine how the statistics could be complemented using companies’ own information of the flow of goods from tracking techniques. By interviewing three different enterprises; two goods owners and one transport company, it has been examined how flows of goods are controlled at each one of the three case companies. It appeared that the information about the flow of goods among the goods owners is fairly small. However, there should be good opportunities to use delivery data maintained by transport companies. This thesis also proposes examples of further research to find out how this information can be used for compiling statistics.

  • 45.
    Ohlin, Mikaela
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Roslund, Lisa
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Flödesanalys av specialbagage på en svensk flygplats2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Företag X är ett företag som arbetar med bagage på flygplats A, de har efterfrågat att få en inblick i hur specialbagagehanteringen ser ut på flygplats A. Syftet med rapporten var att kartlägga flödet av specialbagage samt att undersöka vilka utvecklingsområden som finns i anslutning till specialbagagehanteringen för företag X på flygplats A. Det framkom att det var olika mycket specialbagage på olika typer av flighter. Det har även konstateras att det skulle kunna göras djupare analyser för att se om personal från företag X ska vara stationerade vid specialbagageinlämningen. Vid specialbagageinlämningen skulle då barnvagnspåsar kunna säljas. Företag X skulle även kunna höja sin kundservice gentemot passageraren då de har personal på fler platser runtom Även ett bättre samarbete mellan aktörerna på flygplatsen borde upprättas för att få en bättre förståelse för hur olika arbetssätt påverkar varandra. Dessa samarbeten skulle kunna bestå av kontinuerliga möten.

  • 46.
    Bohm, Jesper
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Svensson, Kristofer
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    Kartläggning av det interna materialflödet vid Lundbergs Produkter AB2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Lundbergs Produkter AB är ett företag som säljer inredningsprodukter till en mängd olika återförsäljare i Norden. Företaget har ett 15 000 m2 stort lager, i vilket de olika artiklar som ingår i sortimentet lagerhålls och plockas innan de skickas till återförsäljarna. I detta lager sker dagligen en mängd olika typer av förflyttningar av artiklar, främst mellan buffert- och plocklagret, och detta flöde anser Lundbergs Produkter AB inte fungerar tillfredsställande i dagsläget. Syftet med denna rapport är att effektivisera företagets lagerverksamhet genom att anpassa påfyllningsrutiner samt styrningsprinciper för olika artiklar i deras sortiment. För att uppnå detta har observationer och intervjuer utförts, vilka sedan har legat till grund för den kartläggning av nuläget som analyseras i denna rapport. Denna kartläggning identifierar ett antal problem med den nuvarande verksamheten; saldodifferenser i plocklagret, ogrundade påfyllningskvantiteter vid påfyllning av artiklar på dess plockplatser samt problem kopplade till det affärssystem som företaget använder, då detta inte möjliggör för påfyllningspersonalen att särskilja brådskande påfyllningsbeställningar utförda av plockpersonal från övriga beställningar, samt att lagersaldon och påfyllningsbeställningar inte uppdateras kontinuerligt. För att lösa det förstnämnda problemet föreslås att företaget inför fortlöpande inventering av utvalda artiklar i sitt sortiment. De artiklar som bör omfattas av den fortlöpande inventeringen är de som genererar mest intäkter, det vill säga de med högst volymvärde, medan övriga kan behandlas på nuvarande sätt även fortsättningsvis. Detta är en kortsiktig lösning på problemet, och för en mer långsiktig lösning föreslås att företaget närmare utreder orsakerna till varför dessa differenser uppkommer. Problemet med att påfyllningsbeställningar utförda av plockpersonal inte särskiljs från övriga beställningar löses enligt den rekommendation som presenteras i rapporten genom att affärssystemet modifieras för att bättre överensstämma med verkligheten. Även problemet med att affärssystemet inte uppdateras kontinuerligt föreslås lösas genom att systemet modifieras. Affärssystemet ska fungera som ett hjälpmedel i den dagliga verksamheten, och för att erhålla full nytta av detta hjälpmedel behöver denna överensstämmelse mellan teknik och verklighet vara god, för att hjälpmedlet inte ska ses som ett hinder i arbetet. Att de påfyllningskvantiteter som används idag inte är grundade på relevant data löses genom att det för varje artikel beräknas en återfyllnadsnivå som baseras på artikelns historiska efterfrågedata och önskad servicenivå för artikeln. Denna återfyllnadsnivå kompletteras med en beställningspunkt, som även den är beräknad utifrån historisk data, vilket gör att varje artikel i praktiken kommer att fyllas på upp till en förutbestämd nivå istället för med en förutbestämd kvantitet, samt att en påfyllningsbeställning automatiskt kommer att genereras i tillräckligt god tid för att brister ska undvikas. Detta bidrar till att arbetsrytmen för de anställda på lagret förbättras. Genom att dessa problem löses kan företagets lagerverksamhet effektiviseras, och företagets möjlighet att erbjuda sina kunder en högre leveransservice ökar.

  • 47.
    Modin, Maria
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, The Institute of Technology.
    ””Världens bästa planeringsprocess” - en analys av en informationsflödesprocess hos ett flygbolag på den skandinaviska marknaden2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Detta projekt har utförts på ett charterflygbolag som verkar på den skandinaviska flygmarknaden, och är en första del i flygbolagets projekt (översatt till svenska) ”Världens bästa planeringsprocess”. ”Världens bästa planeringsprocess” skall kartlägga flygbolagets planeringsprocess sett till från det att en förfrågan kommer in till flygbolaget, till dess att ett svar kan lämnas till kunden. Detta projekt som behandlas i denna rapport studerar informationsflödesprocessen inom flygbolaget med fokus på den planering som sker efter att en kommande säsongs flygprogram är fastlagt. Det vill säga, detta projekt behandlar de förfrågningar som utgör förändringar och tillägg i flygprogrammet. Utifrån en kartläggning har informationsflödesprocessen analyserats utifrån Lean production-teori och tillämpbara åtgärder för att uppnå tidseffektivisering i flöden. Detta har sammanfattats i de följande möjliga åtgärderna för flygbolaget: - Omfördelning av flödet genom synkronisering, parallellisering och sekvensering - Omfördelning av arbetsuppgifter - Tillämpning av Alternate Chief Pilot Det rekommenderas att tillämpa samtliga åtgärdsförslag, vilket bedöms kunna ge en tidsbesparing på mellan 7 och 52 % i ledtid.

  • 48.
    Holmén, Clara
    et al.
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Health Sciences.
    Johansson, Veronica
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Health Sciences.
    Hur sjutton har vi kommit in påre här?: En studie om samtalsämnen och ämnesbyten i ett samtal mellan personer med demens2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In Sweden, approximately 130 000 persons suffer from moderate to severe dementia. Dementia is a collective diagnosis for a collection of diseases in which cognitive impairments are distinctive, and communicative abilities are affected. Earlier studies have investigated how people with dementia communicate with an interlocutor without dementia. How people suffering from dementia communicate with each other is still relatively unexplored.

    The purpose of the present study is to investigate and describe how people suffering from dementia interact with each other, and how they handle topics and topic shifts. The present study was conducted on a day center for people with dementia diagnoses, where a total of three conversations were recorded. One of the conversations, comprising 40 minutes, was transcribed according to conversation analytic principles. From the selected conversation, sequences showing different types of topic changes were selected and exemplified. For an expanded view of the conversation’s topical flow, a topical analysis was made, where the conversation was divided into a total of 14 different episodes. The conversation involved six people with dementia and the two authors of the present study. Examples of topic shifts found in the analyzed conversation were coherent topic shifts in the form of pre-acts, coherent renewal of topic and topic shading. Non-coherent topic shifts occurred in the conversation in the form of non-coherent renewal of a topic. The conversation also contained examples of digressions and inserts. To the outside observer, it seemed at times as if the participants had no common ground for the conversation, which was not noticed by the participants of the conversation. One conclusion drawn from this is that for the participants, the activity is more important than the actual content of the conversation. In the current conversation, the participants returned to the same story and the same topic several times. The different topics occurring during the conversation usually had an overall theme which was what it was like in the old days, when the participants were young or children. 

  • 49.
    Viktorsson Blom, Linnéa
    Linköping University, The Tema Institute, The Department of Gender Studies. Linköping University, Faculty of Arts and Sciences.
    “It could just as well be my body”: A posthumanist and phenomenological study of the becomings of an embodied female subject and her experiences of fitting and misfitting in relation to cosmetic body modifications2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis is a phenomenological study that has been carried out via two semi-structured interviews with an -  in conventional ways of categorising - 22 years old white, heterosexual, and middleclass Swedish woman, referred to as “Andrea”. The thesis aims to explore the becomings of Andrea in connection with cosmetic body modifications and her experiences in relation to this of fitting and misfitting, which are related to the dis/ability system. The aim of this thesis has also been to situate her as an embodied female subject in an intersectional context, in addition to her own experiences, as multiple social categorizations intra-act in the creation of dis/ability. The thesis takes its point of departure in Rosi Braidotti’s theorization of nomadic subjectivity and employs her notion of subjectivity as a negotiation between desire and power, with the goal of analysing the affirmative potential of cosmetic body modifications, as well as being critical towards them and their effects. Rosemarie Garland-Thomson’s concepts of fitting/misfitting are used in order to analyse the intra-actions between body and environment as well as how cosmetic body modifications affect the fit and/or misfit of Andrea.  Sara Ahmed’s notion of orientation has been employed in relation to this, with the aim of showing how beauty, whiteness, femininity, and economic wealth are produced and sustained. In the thesis it is analysed how Andrea, in complex ways desires molarity at the same time as she actively resists “fixed” positionings of her. Andrea contributes to a deconstruction of the fixity of molar identity as her resistance disrupts the flow of expected behaviors - something which creates moments of imperceptibility. The thesis furthermore argues that Andrea uses cosmetic body modifications as an affirmative deconstruction of power in addition to it being a force that drives her towards the desired molarity.

  • 50.
    Andersson, Emil
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, The Institute of Technology.
    Material Flow and Stakeholder Analysis for a Transfer & Recycling Station in Gaborone, Botswana2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Landfilling waste material is still one of the most common methods to take care of waste in a big part of the world. Gaborone, the capital of Botswana located in the southern part of Africa is no different in this way. The major part of all waste is landfilled in Gaborone and there is only a minor part of all collected material that is recycled. One solution that earlier studies suggest is to build a transfer and recycling station in the city of Gaborone that can contribute to a more sustainable waste management. This study aims to identify the major waste streams of recyclable waste and also the major stakeholders that are active in this area through an exploratory study involving interviews, a workshop and a survey. The result of this thesis can hopefully assist in the preparations for such a transfer station. The conclusions of this study are many and contains of both hard facts and also loose ends that can contribute to pursue further studies. The first important result is that all the waste collection companies transports everything they collects to a landfill and it is only recycling organizations that are working with collection and recycling in Gaborone. These recycling organizations are a few but smaller compared to the waste collection companies in collected amounts of material. Besides these collection organizations, Gaborone City Council, the local municipality works with collection of household waste and the collaboration between these three groups that operates in the same environment is very poor. All the interviewed stakeholders showed a positive interest in the transfer and recycling station but there is only a small part of the commercial business in Gaborone that believes in a more serious waste management than landfilling. Despite that one major shopping mall actually sort out recyclables and saves 30% in waste management costs thanks to that. Another issue is the prevailing cultural contradictions that is obvious among the organizations in Gaborone. The last two bigger issues is the tremendously dull political bureaucracy that is appearing in Botswana and also that voices are raised that corruption is great beneath the surface.

1234567 1 - 50 of 2715
CiteExportLink 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