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  • 1.
    Broman, Elias
    et al.
    Linköping University, The Tema Institute. Linköping University, Faculty of Arts and Sciences.
    Hägglund, Maria
    Linköping University, The Tema Institute. Linköping University, Faculty of Arts and Sciences.
    A study of dechlorination of organic matter in forest soil using 36Cl as a tracer2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    During the Fukushima Daiichi power plant incident sea water was used in an attempt to cool reactor Unit 3. Since sea water contains an excessive amount of chloride, 36Cl has likely been formed and spread in the environment. Because of the long residence time and the presumed high mobility in water there is an increased interest to learn more about the biogeochemical cycle of chlorine from a radiation risk assessment perspective. Chlorine occurs in inorganic form as chloride (Clin) or bound to organic matter as organic chlorine (Clorg) and is commonly found in the environment due to both anthropogenic and natural processes. Though there are still uncertainties regarding all of the components of the chlorine cycle in soil, the chlorination of organic matter has been exemplified by research. The reverse process, Clorg mineralizing into Clin, has however not been thoroughly investigated. For this study the objective was to observe at what rate Clorg mineralizes into Clin, this by using 36Cl as a tracer in forest soil. 36Cl was added to the soil and 36Clorg was formed over a period of approximately 100 days. After chlorination the samples were incubated in different conditions and the amount of 36Clorg was observed over a period of time (180 days). The result showed no evident dechlorination during the experiment period which indicates that Clorg can be stable in the organic horizon in forest soil.

  • 2.
    Malmström, Therese
    et al.
    Linköping University, Department of Social and Welfare Studies, Health, Activity, Care. Linköping University, Faculty of Health Sciences.
    Svedjeholm, Sanna
    Linköping University, Department of Social and Welfare Studies, Health, Activity, Care. Linköping University, Faculty of Health Sciences.
    Heteronormativitet – en begreppsanalys: ”Alla är både offer och supportrar av systemet”2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The concept heteronormativity was used in the literature for the first time in 1993. This term can be found in dictionaries and encyclopedias from 2006 but only in a few of the most modern publications. The term currently lacks an exact definition. The aim of concept analysis is to identify characteristics for a term by studying its use. Healthcare relations can and should be developed into a caring relation, which is dependent on a connection involving body, mind and soul between the caregiver and the patient. The aim of this work was to describe and deepen the understanding of the term heteronormativity from a healthcare perspective. Rodgers’ evolutionary concept analysis of 23 scientific papers and common newspapers resulted in seven defined attributes: assumptions, norms, social hierarchies, sanctions for those deviating from the norm, gender roles, sexual relationships and stereotype family apprehension. The analysis also identified what precedes the concept, two women working with the concept and five related concepts: equality, gender, power, discrimination and homophobia. A number of consequences of which all were negative for both individuals and the society were found. Healthcare is negatively influenced in several ways by heteronormativity rendering the caring relation impossible. Conclusion: Heteronormativity leads to a number of problems and everyone are both victims and supporters of the system.

  • 3.
    Pettersson, Tobias
    Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, The Institute of Technology.
    Synchronization of flywheel position between autonomous devices2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    More computing power will be required in Scania’s future engine control units. Calculations is therefore needed to be performed on new hardware such as an FPGA. One problem that arises is synchronization of flywheelposition. This master thesis examines the opportunities existing Scania hardware has to perform synchronization of flywheel position. Different concepts for synchronization have been developed and compared with each other. One of the concepts have been implemented and made possible witha PCB-adapter. The results show that synchronization is possible within given real-time requirements. Finally, an analysis to series production has been made. It show the challenges that an FPGA will face when integrated into a future engine control unit.

  • 4.
    Pehkonen, Henri
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
    Design of Gas Shield for Friction Stir Welding Machine2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The research and development of the final disposal of the nuclear waste produced by the nuclear power plants is an important work done by The Swedish Nuclear Fuel & Waste Management Co. (SKB). As the demands on a final disposal increase the laboratory equipment has to be better in order to do valid experiments. Research on how the copper canister for the spent fuel will be manufactured and handled is done at the Canister laboratory in Oskarshamn, Sweden. The work presented in this report was to design a new gas shield for the friction stir welding machine at the laboratory. The welding machine seals the canisters containing the spent fuel which are then transported to the final disposal 500 meter down in basement rock. To minimize the amount of oxide particles in the weld zone SKB have to design a better gas shield that should deliver the required atmosphere around the welding area.

    The work contains a pre study phase where the important things to consider when designing are collected. Then ideas are generated and concepts created for a new gas shield. These concepts are evaluated by a pair wise comparison method in order to find the most promising concept. The concept chosen is then detail designed to come as close to a manufacturable design as possible.

  • 5.
    Hooi, Mavis
    Linköping University, Department for Studies of Social Change and Culture, Department of History, Tourism and Media. Linköping University, Faculty of Arts and Sciences.
    Oriental Fantasy: A postcolonial discourse analysis of Western belly dancers’ imaginations of Egypt and dance festivals in Egypt2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Belly dance is popularly practised in the West, and every year, thousands of enthusiasts and professionals from around the world travel to attend belly dance festivals in Egypt, which is considered the cultural centre of the dance. This bachelor’s thesis examines the discourses produced by Western or ʽwhiteʼ belly dancers from Sweden and Finland, on the topics of tourism in Egypt and belly dance festivals in Egypt. The texts are analysed using James Paul Gee's discourse analytical framework, combined with postcolonial theory, complemented with an intersectional approach. From the postcolonial and feminist perspectives, belly dance discourse in the West and tourism discourse are problematic, as they perpetuate Orientalist tropes and unequal global power structures, which build on colonial discourse. It is hoped that by identifying and questioning these aspects of discourse that are problematic in terms of equity, this study will make a small contribution towards mitigating its adverse effects, and towards social change.

  • 6.
    Ching, Hsu
    Linköping University, Department of Electrical Engineering.
    Techniques for High-Speed Digital Delta-Sigma Modulators2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this theses techniques for high-speed digital delta-sigma modulator(DDSM) structures are considered. Four techniques are applied andevaluated: unfolding, increasing the number of delay elements in theinner loop, pipelining/retiming, and optimizations provided by thesynthesis tool. Of interest is to see the speed-area-power trade-offs.For implementation, three different modulators meeting the samerequirements are implemented. Each modulator has a 16-bit input andresults in a 3-bit output. The baseline case is a second-ordermodulator, which has one delay element in its inner loop. Throughoptimization, two new structures are found: to provide two delayelements in the inner loop, a fourth-order modulator is required,while to provide three delay elements, a thirteenth-order modulator isobtained.The results show that in general it is better to unfold the modulatorthan to obtain the speed-up through optimizing the arithmeticoperators with the synthesis tool. Using correct pipelining/retimingis also crucial. Finally, for very high-speed implementation, usingthe structures with more delay elements is required. Also, in manycases these are more area and power efficient compared to usingoptimized arithmetic operators, despite their higher computationalcomplexity.

  • 7.
    Borgström, Fredrik
    et al.
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Coyet, Jonas
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Waste heat recovery system with new thermoelectric materials2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Increasing fuel prices, higher demands on "greener" transports and tougher international emission regulations puts requirements on companies in the automotive industry in improving their vehicle fuel efficiency. On a typical heavy duty Scania truck around 30% of the total fuel energy is wasted through the exhaust system in terms of heat dissipated to the environment. Hence, several investigations and experiments are conducted trying to find ways to utilize this wasted heat in what is called a waste heat recovery (WHR) system. At Scania several techniques within the field of WHR are explored to find the profits that could be made.

    This report will cover a WHR-system based on thermoelectricity, where several new thermoelectric (TE) materials will be investigated to explore their performance. A reference material which is built into modules will be mounted in the exhaust gas stream on a truck to allow for measurements in a dyno cell. To analyze new materials a Simulink model of the WHR-system is established and validated using the dyno cell measurements. By adjusting the model to other thermoelectric material properties and data, the performance of new TE materials can be investigated and compared with today’s reference material.

    From the results of the simulations it was found that most of the investigated TE materials do not show any increased performance compared to the reference material in operating points of daily truck driving. This is due to dominance of relatively low exhaust gas temperatures in average, while most advantages in new high performing TE-materials are seen in higher temperature regions. Still, there are candidates that will be of high interest in the future if nanotechnology manufacturing process is enhanced. By using nanostructures, a quantum well based BiTe material would be capable of recovering 5-6 times more net heat power compared to the reference BiTe material. Another material group that could be of interest are TAGS which in terms of daily driving will increase the power output with pending values between 40-80 %. It is clear that for a diesel truck application, materials with high ZT-values in the lower temperature region (100-350°C) must be developed, and with focus put on exhibiting low thermal conductivity for a wide temperature span.

  • 8.
    Emil, Sydhagen
    Linköping University, Department of Culture and Communication.
    Porträttmåleri under stormaktstiden: En studie av maktsymboler2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
  • 9.
    Hanson, Maryam
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems.
    Study on Smart Dust Networks2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis work is done for the department of Electronic System at The Institute of Technology at Linköping University (Linköpings Tekniska Högskolan). Study's focus is to design and implement a protocol for smart dust networks to improve the energy consumption algorithm for this kind of network.

    Smart dust networks are in category of distributed sensor networks and power consumption is one of the key concerns for this type of network. This work shows that by focusing on improving the algorithmic behavior of power consumption in every network element (so called as mote), we can save a considerable amount of power for the whole network.

    Suggested algorithm is examined using Erlang for one mote object and the whole idea has put into test for a small network using SystemC.

  • 10.
    Holm, Rasmus
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Energy-Efficient Mobile Communication with Cached Signal Maps2016Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Data communication over cellular networks is expensive for the mobile device in terms of energy, especially when the received signal strength (RSS) is low. The mobile device needs to amplify its transmission power to compensate for noise leading to an increased energy consumption. This thesis focuses on developing a RSS map for the third generation cellular technology (3G) which can be stored locally at the mobile device, and can be used for avoiding expensive communication in low RSS areas.

    The proposed signal map is created by crowdsourced information collected from several mobile devices. An application is used to collect data in the mobile device of the user and the application periodically sends the information back to the server which computes the total signal map.

    The signal map is composed of three levels of information: RSS information, data rate tests and estimated energy levels. The energy level categorizes the energy consumption of an area into "High", "Medium" or "Low" based on the RSS, data rate test information and an energy model developed from physical power measurements. The coarse categorization provides an estimation of the energy consumption at each location. It is evaluated by collecting data traces on a smartphone at different locations and comparing the measured energy consumption at each location to the energy level categories of the map.

    The RSS prediction is preliminarily evaluated by collecting new data along a path and comparing how well it correlates to the signal map. The evaluation in this thesis shows that with the current collected data there are not enough observations in the map to properly estimate the RSS. However, we believe that with more observations a more accurate evaluation could be done.

  • 11.
    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.

  • 12.
    Kantzon, David
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    PFC-design for frequency converter2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis deals with power factor correction for three-phase systems. A boost-buck topology was described, modeled and then simulated in MATLAB/Simulink. The simulation results show that the system provides a power factor over 99% over the tested power output range. Moreover, the harmonic injection concept was introduced which reduces the total harmonic distortion to 8.72% at full output power. A prototype system was also built using an FPGA for the control system. The prototype did not provide the performance seen in simulation but showed that the method is valid and does provide a higher power factor when used.

  • 13.
    Gustafsson, Daniel
    et al.
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Larsson, Isak
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
    Solvärme i Singapore2015Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The world faces big issues regarding its energy supply and its impact on the environment. Something has to be done in order to stop this. One way to do that is to make energy generation more sustainable by shifting from fossil fuels to renewable energy sources. Solar energy is one of them, and this report covers hot water produced from it.

    A country that should have good conditions to harvest solar power is Singapore. The country has a very limited land area and almost no natural resources. Because of this, most of its energy is supplied by imported natural gas. In this report, a case has been created to evaluate the performance and profitability of a hot water solar system in a villa in Singapore. In order to do this, literature about the sun, solar heating systems and Singapore has been looked into. Further, thermodynamical correlations have been studied and used in calculations to draw conclusions.

    The result of this report is that an installation of a solar water heating system in a villa in Singapore is feasible and profitable. Other applications of solar thermal power have been evaluated qualitatively and the conclusion is that these also have big potential in Singapore. Ultimately, this could lead Singapore to be less relying on imported energy and also reduce its impact on the environment.

  • 14.
    Ledin, Staffan
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems.
    A Comparison of Radix-2 Square Root Algorithms Using Digit Recurrence2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    When designing an electronic system, it might be desirable to implement a custom square root calculator unit to ensure quick calculations. The different questions when it comes to square root units are many. What algorithms are there? How are these algorithms implemented? What are the benefits and disadvantages of the different implementations? The goal of this thesis work is to try to answer these questions. In this paper, several different methods of calculating the radix-2 square root by digit recurrence are studied, designed and compared. The three main algorithms that are studied are the restoring square root algorithm, the non-restoring square root algorithm and the SRT (Sweeney, Robertson, Tocher) square root algorithm. They are all designed using the same technology and identical components where applicable. This is done in order to ensure that the comparisons give a fair assessment of the viability of the different algorithms. It is shown that the restoring and non-restoring square root algorithms perform similarly when using 65 nm technology, a 16 bit input, full data rate and 1.2 V power supply. The restoring square root algorithm have a slight edge when the systems are not pipelined, while the non-restoring algorithm performs slightly better when the systems are fully pipelined. The SRT square root algorithm perform worse than the other two in all cases.

  • 15.
    Bostedt, Robert
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Bitcoin & valutakonkurrens: En jämförande nyttoanalys2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper investigates the fulfillment of utility in the currency Bitcoin in relation to the Swedish krona in general andthe macroeconomic consequences of such fulfillment of utility in particular. The paper starts with the assumption thatthe utility generated by money is deduced from its qualities, mainly the quality in storage of value and the currency´spossibilities of generating low transaction costs. The investigation finds that there are possibilities that Bitcoin maygenerate a higher utility for its users than the Swedish krona under some circumstances. This mainly from Bitcoinsqualities in storage of value due to its predetermined change in money supply and in times when the Swedish krona´smonetary base is expanded by monetary policy and its subsequent inflation. In such periods when monetary expansionis undergoing in the Swedish krona, the investigation finds that the expected higher utility in Bitcoin in relation to theSwedish krona may cause a change of individuals incentives for currency, away from the Swedish krona and towardsBitcoin, if the profit gained from such change for an individual is great enough. From this, the central analysis ofBitcoins consequences on macroeconomic level follows. If there is an opportunity to change currency, which causesutility profits for individuals, there is also risk that the stimulus in monetary policy fails. This due to the decrease ofpurchasing power in the Swedish krona due to the lower demand of the currency in question subsequent to its loss init’s quality of storage of value. The analysis finds that depending on which theoretical perspective that is used, systemicrisks stemming from Bitcoin usage can be found in an analysis made with the Keynesian perspective. This while theopposite, that the systemic risks are introduced in the economy with the Swedish krona, is the result of an analysis madewith the Austrian theory of business cycle. Even with the systemic risks identified in the Keynesian analysis, reformsare suggested so that Bitcoin is able to co-exist with Keynesian monetary institutions to be able to take care of the utilitygained on the microeconomic, individual level that may result from Bitcoins usage as means of trade.

  • 16.
    Hasan, Mustafa
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Nguyen, Felix
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Inflation och den Marginella konsumtionsbenägenheten2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay is an econometric study that aims to empirically estimate the relationship between inflation and marginal propensity to consume in Sweden by Error Correction Model (ECM). Two models are developed using the Error Correction Model (ECM) with explanatory variables such as inflation, real interest rates, disposable income, unemployment, and financial assets. We the focus on the relationship between inflation and marginal propensity to consume (MPC). We estimate short and long term dynamic changes in consumption the parameters by ECM models. The theoretical framework of this paper is the Keynesian consumption theory and the Neo-classical consumption theory. We draw conclusions about the relationship between those factors. The results show that there is a statistically significant relationship between inflation and marginal propensity to consume. In the short term, inflation has a positive correlation on the marginal propensity to consume, which means that willingness to consume in the present increases, in order to not lose purchasing power in the inflation increase. In the long term the relationship is negative for the reason that consumers are maximizing utility and distribute their consumption over time in order to consume at the same level for several periods. We find short-term inflation causes 80 percent increase in the MPC; all else being equal. In the long run, over the two periods, inflation causes 24 percent increase initially and then 27 percent decline in the MPC.

  • 17.
    Hammarfrid, Peter
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Henningsson, Tom
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Multifaktormodeller på den svenska marknaden - En studie av OMX Stockholm mellan 1996 och 20142015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background:CAPM isn’t in some cases sufficient for explaining expected stock return. Some of CAPM´smispricing errors are well documented and time persistent which has led rise to the usage of correctivefactors. One model that make use of two such corrective factors are the Fama and French three factormodel. It´s been comprehensively tested on the Swedish market where it has shown to achieve higherexplanatory power then the CAPM. In the year of 2012 and 2014 two new Asset Pricing Models wereintroduced, which on the US stock market better captured many of the best known anomalies.Aim:The aim of the study is to test if the Fama and French five factor model as well as the Q-factor model,could contribute to increased explanatory power beyond the three factor model. The study also analyzethe models cyclical sensitivity as well as the individual factor significance.MethodologyThe knowledge building process takes a deductive approach. Existing theories in the form of assetpricing models are tested based on empirical observations in the Swedish market. The research take aquantitative approach and make use of econometric tools in order to ensure statistic accuratesignificance.Result:This research shows no contribution of explanatory power for the Q-factor model, beyond thatachieved from the Fama and French three factor model. The five factor model achieve marginallyhigher explanatory power compared to the tree factor model. The most likely reason why FF5Machieve better results than the Q-factor model is believed to lie in the usage of the factor HML. Theresults also shows that all of the tested models are very instable when used in a short time perspective.Although there are some clear indication on increasing explanatory power in recession compared to inan ongoing bull market.

  • 18.
    Sonda, Claudiu-Nicolae
    Linköping University, Department of Management and Engineering, Political Science.
    The Security Dilemma of the Wider Black Sea Region: With a Focus on Russia, the United States of America, and Romania2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The topic of this paper revolves around the security environment of the wider Black Sea region, with a focus on three protagonist states, and an alliance: Russia, the United States of America, Romania, and NATO. This work comes as a response to the normative demand of avoiding an inter-state conflict in this part of the world, an area already characterized by deep mistrust, frozen conflicts, separatist movements, transnational organized crime, terrorism, and great-power struggle between holders of nuclear capabilities. The objective of this paper is explanatory, namely to help pinpoint the root causes of potential conflict between regional players. By pursuing a Defensive Realist approach, it is suggested that perception of insecurity lies at the heart of the negative dynamics. It is the inter-state security dilemma that could have the ultimate effect of transforming tensions into a spiral of conflict, unless such dilemma is mitigated through its regulators. Therefore, ‘by alleviating the security dilemma, conflict in the wider Black Sea region can be avoided’. The testing of this hypothesis constitutes the contents of this paper. The conclusion of the thesis confirms the expected results, namely that there is a security dilemma operating in the wider Black Sea Region, and that the regulators have the ability to influence its escalation, yet particular specifications are to be observed.

  • 19.
    Andersson, Erik
    Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
    Modelling of Cranking Behaviour in Heavy Duty Truck Engines2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

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

  • 20.
    Svahn, Sandra
    et al.
    Linköping University, Department of Social and Welfare Studies, Social Work. Linköping University, Faculty of Arts and Sciences.
    von Wachenfelt, Pia
    Linköping University, Department of Social and Welfare Studies, Social Work. Linköping University, Faculty of Arts and Sciences.
    Hedersrelaterat våld i Socionomen: En innehållsanalys2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Hedersrelaterat våld är idag ett samhällsproblem som det saknas kunskap om. Problemati-ken uppmärksammades av media i samband med de hedersmord som skedde under 1990-talet och framåt. Hedersrelaterat våld handlar om att kontrollera flickan/den unga kvinnans sexualitet. Ett vanligt förekommande för att kontrollera henne är att gifta bort flickan/den unga kvinnan.

    Syftet med studien är att undersöka hur hedersrelaterat våld konstrueras i tidningen Socio-nomen. För att uppnå detta syfte har vi valt att göra en innehållsanalys av artiklar från Socionomen där hedersrelaterat våld benämns. Vi har gjort en tematisk analys av artiklarna och formulerat ett antal återkommande teman. Studiens teoretiska utgångspunkter är social-konstruktivism, vilken genomsyrar hela uppsatsen, feministisk teori, Foucaults teori om makt samt kulturalisering.

    Studiens resultat är att flickor/unga kvinnor konstrueras som de utsatta för hedersrelaterat våld samt att våldet anses ha med kultur att göra. Författare kulturaliserar våldet i sina tex-ter vilket leder till en andrafiering av personer med annan kulturell bakgrund än svensk.

  • 21.
    Rapp, Joel
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University.
    Turesson, Jonatan
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University.
    Hydrostatic transmission in wind turbines: Development of test platform2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master thesis project is a part of a larger project with the goal of develop-ing a drivetrain, utilizing a hydrostatic transmission, for horizontal axis mid-sizewind turbines. Some of the benefits from using a hydrostatic transmission are thata variable speed operation is possible without the use of a frequency converter,the generator may be placed on the ground and thus reduce weight in the nacelleand also using hydraulic components can increase lifetime and robustness of thesystem. The thesis work is a part of the second step towards this goal, whichcontains constructing a test platform of the concept.

    The test platform is being built at the Laboratory of Hydraulic and PneumaticSystems (LASHIP) in Florianópolis, Brazil, where also the master thesis projecthas been conducted. Two companies are involved in the construction of the plat-form, Parker Hannifin and Reivax. Parker Hannifin is a multinational diversifiedmanufacturer of motion and control technologies and systems. Reivax developtechnologies for control systems and automation applied in Hydroelectric, Ther-moelectric and Nuclear power plants.

    The project was performed during the period of February to August 2015 andgoverns dimensioning and selection of hydraulic components for the test platform,development of simulation model in AMESim, evaluation of control strategies andalso a dynamic analysis of the system.

    Dimensioning the platform resulted in a drivetrain with an output power of28 kW. Standard hydraulic components with high efficiencies where selected fromParker’s product portfolio. These components were then modeled in AMESimwhere simulations of the whole system could be performed. Control strategieswere tested and results showed that the best performance is reached when usinga regulator that is able to compensate for pressure changes in the system. Re-sults also indicated that the hydrostatic transmission can perform very well as areplacement of frequency converters, in terms of stable frequency output of a vari-able wind turbine. The dynamic analysis showed that the parameter that sets themain characteristics of the system is the aerodynamic rotor with its large inertia.

  • 22.
    Ekström, Ellen
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Arts and Sciences.
    Using Shared Priorities to Support Training of Nuclear Power Plant Control Room Crews2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Swedish nuclear power plant control room crews have training sessions in full scope simulators every year. These sessions are designed to prepare operators to cope with incidents and accidents. The aim is to develop operators’ knowledge, skills and abilities necessary to operate the nuclear power plant in a safe manner. Training sessions is an opportunity to practice and develop the crews’ teamwork, decision processes and working strategies.

    The purpose of this study was to explore if and how the instrument Shared Priorities can support training of nuclear power plant control room crews. Shared Priorities is an instrument to measure teams’ shared awareness of a situation and has in earlier studies been used in military and student teams. During the simulator re-training period of control room crews, 14 crews used the instrument Shared Priorities in one or two of their training scenarios. The instrument consists of two steps. Firstly, crew members generate and prioritise a list of five items they think are most important for the crew to cope with in the scenarios current situation. They also rank another crew member’s list. Secondly, the crews and instructors perform a focus group discussion based on the generated lists.

    Results from questionnaires, focus group discussions and an interview with instructors showed that operators and instructors believe that Shared Priorities can support their training in several ways. Crews see meetings and other disseminations of information as an essential part of maintaining shared understanding of different situations. They believe the instrument may help crews reflect upon and develop their meeting procedures. Operators and instructors also believe that by using the instrument it can help crews to increase their understanding of having a shared situation understanding and shared vision. However the procedure when using Shared Priorities has to be modified in order to be able to support crews’ training in an optimal way.

  • 23.
    Hammarling, Josefine
    et al.
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM. Linköping University, Faculty of Arts and Sciences.
    Holmstedt, Charlie
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM. Linköping University, Faculty of Arts and Sciences.
    Vem är du?: En diskursanalytisk studie om transpersoners upplevda bemötande i feministiska forum på nätet2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The idea for this study was evoked from a number of observations that we did in relation to our personal interest for feminism and gender studies. We have noticed tendecies of identity politics in feminist web­based discussion forums, which have led to intermutual conflicts within the feminist movement. Discussions of great importance between the members of these discussion forums, have oftentimes ended up being matters of interpretative prerogative, and to whom it belongs, as well as questions about who holds authority to claim which opinion, and why one holds authority to claim any opinion at all. We read this phenomenon as a matter of power configuration ­ for even within these formed groups of people that are oppressed in the western majority culture, relations including roles with oppressing positions as well as roles with oppressed positions emerge.

    In this study we have chosen to focus on a certain type of identities that are frequently stressed when conflicts emerge in these web­based forums, namley transgender identities. The purpose of this paper is to bring forward the narratives of people with transgender identities, about their experienced possibilites to word in feminist web­based discussion forums, as well as analyze the discourses of power that figures in these forums. The material for this study was collected through qualitative interviews, which were made with four different respondents. All of which having experience of being transgender and members of different feminist web­based forums. The analysis in turn consists of essential recitals by the respondents, which are resolved from a discourse theoretical perspective. According to discourse theory, power configurations between people are made from a variation of factors that determine the directions of power, and are constantly reformed from one moment to another. From the recitals of our respondents we understand that there are several power discourses prevailing concurrently in the feminist web­based discussion forums, and that there is no binary and consistent divergence between the oppressing position and the oppressed position. A person whose identity validates its power in one discussion, can be totally powerless because of its identity in another. 

  • 24.
    Bjarnle, Johan
    et al.
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Holmström, Elias
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Implementation and Evaluation of Historical Consistent Neural Networks Using Parallel Computing2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Forecasting the stock market is well-known to be a very complex and difficult task, and even by many considered to be impossible. The new model, emph{Historical Consistent Neural Networks} (HCNN), has recently been successfully applied for prediction and risk estimation on the energy markets. HCNN is developed by Dr. Hans Georg Zimmermann, Siemens AG, Corporate Technology Dpt., Munich, and implemented in the SENN (Simulation Environment for Neural Network) package, distributed by Siemens. The evalution is made by tests on a large database of historical price data for global indicies, currencies, commodities and interest rates. Tests have been done, using the Linux version of the SENN package, provided by Dr. Zimmermann and his research team. This thesis takes on the task given by Eturn Fonder AB, to develop a sound basis for evaluating and using HCNN, in a fast and easy manner. An important part of our work has been to develop a rapid and improved implementation of HCNN, as an interactive software package. Our approach has been to take advantage of the parallelization capabilities of the graphics card, using the CUDA library together with an intuitive and flexible interface for HCNN built in MATLAB. We can show that the computational power of our CUDA implementation (using a cheap graphics device), compared to SENN, is about 33 times faster. With our new optimized implementation of HCNN, we have been able to test the model on large data sets, consisting of multidimensional financial time series. We present the results with respect to some common statistical measures, evaluates the prediction qualities and performance of HCNN, and give our analysis of how to move forward and do further testing.

  • 25.
    Joelsson, Andreas
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ohlsson, Jonathan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Indoor propagation modelling at microwave frequencies in a server environment2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Link¨oping site is the first of Ericsson’s three information and communication technology centres. This facility will house the company’s complete portfolio and use the latest cloud technology in order to enable the research and development engineers to more efficiently test and develop new technologies. In the test lab environment there is a high capacity microwave telecommunication system called MINI-LINK. These systems operate at much higher frequencies than more traditional telecommunication systems. In the test lab these systems are communicating with a cable interface instead of its intended air interface. The purpose of this thesis is to evaluate the potential leakage of this system in the test lab environment.

    The evaluation of the leakage in the test lab is done by developing an empirical path loss model for the desired frequencies used by the equipment in the test lab. This model is later implemented in a leakage simulation tool designed in Matlab, which simulates and displays the leakage power in a 2D plane. This report mainly focuses on the process of determining the constants and the implementation of the path loss model.

  • 26.
    Johansson Ramnäs, Tobias
    et al.
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Wern, Christoffer
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Office Open XML conversion with integrated result-altering GUI2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Yooba is a small company based in Norrköping and they are developing a software tool to easily create and manage applications for iPads and Windows tablets. The environment where to one creates applications is called Yooba Studio and a missing feature that has been requested by their users is a PowerPoint-file importer. PowerPoint, or Microsoft PowerPoint, is a software used to create presentations. To store the presentation data an open XML standard is used called Office Open XML, often shorten OOXML or Open XML. This master thesis will explain how the information inside a OOXML presentation package PPTX can be stored and converted into a new presentation structure, Yooba XML. The thesis work will also explain how an interface, through user tests and prototyping, can be developed to present, for the user, differences when importing between the source program and the final result in Yooba Studio. The developed interface will involve the user in the importation in such way that the user will be the one altering how some of the differences should be imported. The results of this thesis is a working integrated PPTX-file importer where the user can both see statistics over how successful the import were and be able to customize how the final importation result should be.

  • 27.
    Bandla, Atchaiah
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Highly Linear 2.45 GHz Low-Noise Amplifier Design2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One critical component of the communication receiver of front-end system is the low-noise amplifier (LNA). For good sensitivity and dynamic range, the LNA should provide a low noise figure and maximum attainable power gain. Another concern is the linearity of the LNA. Strong signals produce intermodulation products in a frequency band close to the operating frequency that might affect the performance of the receiver. In many cases, the intermodulation products can be reduced by increasing the current through the active device. Hence, a trade-off between power consumption and linearity must be considered when designing the LNA. The thesis includes the bias network design, stability analysis, matching network design and layout design of the LNA RF module with layout simulation. The simulation has been performed using Advanced Design System (ADS) simulation software. After implementation of LNA on a PCB, the LNA is measured with the help of the power supply unit and vector network analyzer. The proposed design aim is to provide a low noise figure (NF) and high gain while maintaining the low power consumption.

  • 28.
    Sukhova, Maria
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Engineering, Political Science.
    Russification of Soft Power: Reconceptualization of soft power in contemporary Russia2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This research explores the limits of the concept of soft power by critically examining the reconceptualization of soft power in contemporary Russia. It seeks to highlight the peculiarities of the Russian interpretation of soft power compared to the original Western approach. To this end, it argues that Russia has a dualistic perception of soft power. On the one hand, soft power is understood as an external threat to the country’s sovereignty and national security. On the other hand, soft power is seen as a great opportunity to increase the country’s efficiency in attaining its foreign policy goals, improve its international image and overall performance in the global arena.

  • 29.
    KNUTFELT, MARKUS
    Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
    Charging Cost Optimization of Plug-in Hybrid Electric Vehicles2015Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The future success of chargeable vehicles will, among other factors, depend on their charging costs and their ability to charge with minimal disturbances to the national, local and household electrical grid. To be able to minimize costs and schedule charging sessions, there has to be knowledge of how the charging power varies with time. This is called charging profile. A number of charging profiles for a Volvo V60 plug‑in hybrid electric vehicle have been recorded. For charging currents above 10 A they prove to be more complex than are assumed in most current research papers.

     

    The charging profiles are used together with historical electricity prices to calculate charging costs for 2013 and 2014. Charging is assumed to take place during the night, between 18:00 and 07:00, with the battery being totally depleted at 18:00. By using a timer to have the charging start at 01:00, instead of immediately at 18:00, annual charging costs are reduced by approximately 7 to 8%. By using dynamic programming to optimize the charging sessions, annual charging costs are reduced by approximately 10 to 11%. An interesting issue regarding dynamic programming was identified, namely when using a limited set of predetermined discrete control signals, interpolation returns unrealizable cost-to-go values. This occurs specifically for instances crossing the zero cost-to-go area boundary.

     

    It is concluded that the mentioned savings are realizable, via implementing timers or optimization algorithms into consumer charging stations. Finally, by using these decentralized charging planning tools and seen from a power usage perspective, at least 30% of the Swedish vehicle fleet could be chargeable and powered by the electrical grid.

  • 30.
    Gullaksen, Li
    et al.
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM. Linköping University, Faculty of Arts and Sciences.
    Bogmark, Linn
    Linköping University, Department for Studies of Social Change and Culture, Culture, Society and Media Production - KSM. Linköping University, Faculty of Arts and Sciences.
    UTANFÖR ÄR DET NYA INNANFÖR: En kvalitativ intervjustudie om Norrköpings kulturaktörer och hur de verkar inom stadens kulturfält2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This is a qualitative study about the city of Norrköpings culture producing scene and it’s participants. We focus on their establishment and the strategies and power structures in the field, but also on the dynamics of competition and collaboration. The study is based on eight semi-structured interviews with selected cultural producers and administrators in Norrköping, and the analysis is inspired by Pierre Bourdieus theory and notions of cultural fields and capital theories. In the conclusion we can see that the city is perceived as having a positive attitude towards culture and that it is a good place for participants to operate. They are also having an optimistic view of the growth of cultural production because they believe in collaboration instead of a competition. We live in a networking society were the participants thinks that networking is the key to success. But there are also a problematic for operating in the field today because of a dilemma of how the resource should be distributed and how they are used.

  • 31.
    Häger, Emil
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, Faculty of Science & Engineering.
    Performance Evaluation of Medium-Power Voltage Inverters2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design is implemented physically and is found to achieve 94.5% efficiency and 7% THD under low voltage laboratory conditions, while remaining smaller than an average textbook.

  • 32.
    Örtenberg, Alexander
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Parallelization of DIRA and CTmod Using OpenMP and OpenCL2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Parallelization is the answer to the ever-growing demands of computing power by taking advantage of multi-core processor technology and modern many-core graphics compute units. Multi-core CPUs and many-core GPUs have the potential to substantially reduce the execution time of a program but it is often a challenging task to ensure that all available hardware is utilized. OpenMP and OpenCL are two parallel programming frameworks that have been developed to allow programmers to focus on high-level parallelism rather than dealing with low-level thread creation and management. This thesis applies these frameworks to the area of computed tomography by parallelizing the image reconstruction algorithm DIRA and the photon transport simulation toolkit CTmod. DIRA is a model-based iterative reconstruction algorithm in dual-energy computed tomography, which has the potential to improve the accuracy of dose planning in radiation therapy. CTmod is a toolkit for simulating primary and scatter projections in computed tomography to optimize scanner design and image reconstruction algorithms. The results presented in this thesis show that parallelization combined with computational optimization substantially decreased execution times of these codes. For DIRA the execution time was reduced from two minutes to just eight seconds when using four iterations and a 16-core CPU so a speedup of 15 was achieved. CTmod produced similar results with a speedup of 14 when using a 16-core CPU. The results also showed that for these particular problems GPU computing was not the best solution.

  • 33.
    Jansson, Lisa
    et al.
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Health Sciences.
    Höglund, Emelie
    Linköping University, Department of Clinical and Experimental Medicine. Linköping University, Faculty of Health Sciences.
    Logopeders samtal med närstående till en person med afasi: En samtalsanalys2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In institutional interactions such as conversations between a speech and language therapist, a person closely related to a person with aphasia and the individual with aphasia there is an asymmetry considering the power. The asymmetry arising in institutional interactions may mean that the participant with the least power will experience a face threatening act. Understanding is seen as a dynamic process and when understanding is a problem in the conversation the ongoing activity is disturbed. The receiver can solve the problem by giving the speaker a candidate understanding. How these strategies are used in conversations between a speech and language therapist with a person closely related to a person with aphasia is a relatively unexplored field and an important area which is a common for speech therapists. The aim of the present study was to investigate a number of communication strategies in the conversation with a person closely related to a person with aphasia; how understanding was reached and how face threatening acts were reduced when the speech therapists delivered test results and gave counseling. Three conversations between speech and language therapists, persons closely related to a person with aphasia and in two of the recordings the person with aphasia were recorded, transcribed and analyzed according to principles of Conversation Analysis (CA). Two speech and language therapists, three persons closely related to a person with aphasia and two persons with aphasia participated in the study. In total, the recorded material is one hour and 37 minutes. Participating speech and language therapists also filled in a questionnaire. Strategies for mitigation and understanding were identified. The strategies were divided into two categories; strategies to mitigate FTA:s when delivering the test results and counseling, the other categorie was the use of candidate understandings for gaining an mutual understanding. The study revealed that candidate understandings were often initiated by the person closely related to a person with aphasia. The study also revealed that the test results with positive outcome where not mitigated and often emphasized and test results that could be perceived as negative were mitigated with hedging.

  • 34.
    Ebintra, Emma
    Linköping University, The Tema Institute, The Department of Gender Studies. Linköping University, Faculty of Arts and Sciences.
    The Intersectional Stigmatization of the Piranha in Prostitution: A case study of young women in prostitution  in central Lima2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is constructed upon narratives of fourteen young women, who have been working in prostitution since they were street children in central Lima, and acknowledges their stigmatization in the Peruvian society, and how they challenge their socially constructed position. By combining narrative method with an intersectional analysis I have, through a multi-layered loupe, interpreted the young women’s interpretation of themselves and their social world. I will bring forward how these young women view their subordinate and stigmatized position through their narratives surrounding their bodies as shameful, culpable, sexual and fixed. This stigmatization is intersectional as it surrounds all parts of their lives and situatedness within the Peruvian society. This situatedness is complex, involving hierarchical structures that have been present in Peru since colonization and imperialism (cf. Wade 2009). In addition, I will bring forward how the young women engage in strategies to challenge this stigmatization by applying measures to increase their respectability (cf. Skeggs).

  • 35.
    Ericsson, Marcus
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Transmission, Storage, and Visualization of Data with ANT+2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Ultra low-powers wireless technology sensors uses when devices is used to consumeslow power. ANT+ sensors can run for years on a single coin battery. In thethesis the ANT+ sensor data is used in an application that can store and visualizethe data.

  • 36.
    Andersson, Jonas
    Linköping University, Department of Social and Welfare Studies. Linköping University, Faculty of Arts and Sciences.
    Konsensus eller kompromiss?: En studie om det offentliga och civilsamhället inom ramen för en välfärdsomvandling2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsens utgångspunkt är samverkansarbete mellan det offentliga och civilsamhället inom ramenför den nationella Överenskommelsen inom sociala frågor. Kontexten är den samhälleligaomvandling och de välfärdsförändringar som skett sedan 1970-talet. Tidigare forskning inom ämnethar visat att konfliktperspektivet saknats inom forskningen av samverkan mellan det offentliga ochcivilsamhället.

    Uppsatsen bygger på det emancipatoriska kunskapsintresset vars strävan är att identifiera orsakertill missförhållanden och missförståelse som ligger bakom vissa fenomen, i det här falletkonsensusbegreppet. Uppsatsen lyfter fram maktasymmetri som en begränsande faktor inomramen för samverkansarbete mellan det offentliga och civilsamhället. Uppsatsen visar att det råderen oklar rollfördelning inom samverkansarbetet och de idéburna organisationerna vet inte huruvidaman är en röstbärare eller en serviceutförare. De idéburna organisationerna är även rädda för attframstå som kritiska gentemot det offentliga eftersom man då riskerar att tappa ekonomiskt stöd.

    Uppsatsen lyfter det trilaterala sanningsbegreppet för att uppdaga dold mening, hur dennakorresponderar med verkligheten och slutligen hur detta kan komma till praktisk användning.Resultatet kan ses som både teorigenererande och kunskapsproducerande med anledning avambitionen att integrera den kritiska teorins metaperspektiv med konkret empiriskt material, dvs.den nationella Överenskommelsen inom sociala frågor.

  • 37.
    Michailovskyte, Giedre
    Linköping University, Department of Management and Engineering, Political Science. Linköping University, Faculty of Arts and Sciences.
    Diversification of Contemporary Diplomacy - the Rise of Dance Diplomacy2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study investigates the diversification of contemporary diplomacy in a deeper manner by choosing the concept of dance, which has never been chosen before. Theoretical andhistorical analysis of dance diplomacy helps us to answer the main research question of thestudy how does dance diplomacy contribute to the diversification of contemporary diplomacy. This research paper utilizes a qualitative methodology with the interpretative, historical, descriptive and cultural approaches and uses qualitative methods of literature review, content analysis, comparative analysis and theory triangulation. In this study we seethat dancers and choreographers complement today's diplomats, we find that the implications of cultural diversity expand an understanding of contemporary diplomacy, and that new emerging practices of dance diplomacy contribute to “new diplomacy” findings. Furthermore, practices of dance diplomacy could be described as parts of cultural diplomacy, public diplomacy, instruments of soft power or forms of nonverbal communication. This illustrates that contemporary diplomacy is somehow shaped by culture, public, power and communication, and therefore it could be understood from all these perspectives. Besides this, a chosen historical perspective and a background of the dance diplomacy help us to see that dance diplomacy is a natural consequence of the evolution of diplomacy. At last, it is relevant for the academic society to ground it on a scientific theoretical basis, which could expand our understanding of contemporary diplomacy.

  • 38.
    Gustavsson, Marcus
    et al.
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    Levén, Daniel
    Linköping University, Department of Management and Engineering, Economics. Linköping University, Faculty of Arts and Sciences.
    The Predictability of Speculative Bubbles: An examination of the log-periodic power law model2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this thesis we examine the ability of the log-periodic power law model to accurately predict the end of speculative bubbles on financial markets through modeling of asset price dynamics on a selection of historical bubbles. The methods we use are based on a nonlinear least squares estimation which yields predictions of when the bubble will change regime.We find evidence which support the occurrence of LPPL-patterns leading up to the change in regime; asset prices during bubble periods seem to oscillate around a faster-than-exponential growth. In most cases the estimation yields accurate predictions, although we conclude that the predictions are quite dependent on at which point in time the prediction is conducted. We also find that the end of a speculative bubble seems to be influenced by both endogenous speculative growth and exogenous factors. For this reason we propose a new way of interpreting the predictions of the model, where the end dates should be interpreted as the start of a time period where the asset prices are especially sensitive to exogenous events. We propose that negative news during this time period results in a regime shift of the bubble. This study is the first to address both the possibilities and the limitations of the LPPL-model, and should therefore be considered as a contribution to the academia.

  • 39.
    Rindzeviciute, Egle
    Linköping University.
    The Birth of the Soviet Anthropocene: Nikita Moiseev and theTransformation of SovietGovernmentality2015Conference paper (Other academic)
    Abstract [en]

    Arguing the roots of the idea of Anthropocene can be traced back to the Soviet Union, the paper introduces hitherto unexplored but highly innovative Russian thinker, Nikita Moiseev. The director of the Computer Centre of the Soviet Academy of Sciences, Moiseev promoted mathematical modelling of the environmental processes, but also he was deeply interested in the use of scientific expertise for governmental processes. In this way, Moiseev belonged to the new type of a scientist, the one that was attached to both worlds scientific research and governance and situated at the centre of the powerful industrial-military complex. Just like the inventor of cybernetics, Norbert Wiener, Moiseev used his experience of modelling global environmental systems to rethink fundamental conceptual premises and techniques of the contemporary governance. This study examines key features of a new Soviet governmentality, outlined in Moiseev’s writings, in particular the ones connected with a famous US-Soviet forecast of nuclear winter. The paper argues that Moiseev’s ideas, explicated in such popular books as 'The Man and Biosphere' and 'Contemporary Rationalism', coalesced into a highly original philosophy of governance which in many ways resembled the later idea of the Anthropocene, formulated by Paul Crutzen (who was also part of Moiseev's networks). Drawing on Vernadskii, Moiseev conceptualised the co-evolution of the man and the biosphere, which was an astonishing way of thinking about governance and control completely outside of the iron cage of communist ideology. It is in Moiseev's thought, I argue, that the communist governance was overhauled and, importantly, this happened at the very heart of the power.

  • 40.
    Haider, Daniyal
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, Faculty of Science & Engineering.
    On-Chip Phase Measurement Design Study in 65nm CMOS Technology2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Jitter is generally defined as a time deviation of the clock waveform from its desired position. The deviation which occurs can be on the leading or lagging side and it can be bounded (deterministic) or unbounded (random). Jitter is a critical specification in the digital system design. There are various techniques to measure the jitter. The straightforward approach is based on spectrum analyzer or oscilloscope measurements. In this thesis an on-chip jitter measurement technique is investigated and the respective circuit is designed using 65 nm CMOS technology. The work presents the high level model and transistor level model, both implemented using Cadence software. Based on the Vernier concept the circuit is composed of an edge detector, two oscillators, and a phase detector followed by a binary counter, which provides the measurement result. The designed circuit attains resolution of 10ps and can operate in the range of 100 - 500 MHz Compared to other measurement techniques this design features low power consumption and low chip area overhead that is essential for built-in self-test (BIST) applications.

  • 41.
    Gustavsson, Emily
    et al.
    Linköping University, Department of Management and Engineering, Business Administration. Linköping University, Faculty of Arts and Sciences.
    Mlivic, Anja
    Linköping University, Department of Management and Engineering, Business Administration. Linköping University, Faculty of Arts and Sciences.
    Medelstora företags inköpsarbete och affärsrelation med en större leverantör2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background

    Purchasing has been more acknowledged during the last couple of years.Higher demands from customers have led to companies seeingadvantages with close business relationships. However, medium-sizedenterprises have influences from both big and small enterprises and it istherefore hard to know what starting position they have in businessrelationships. The literature review shows that research is lacking foronly medium-sized enterprise’s buying process. Therefore it isinteresting to study purchasing in medium-sized enterprises with focuson their business relationship with a larger supplier, to be able to see howboth parties perceive the business relationship and if medium-sizedenterprises can be classified in the same definition.

    Aim

    The aim with this study is to gain a greater insight of purchasing inmedium-sized enterprises, with a focus on their business relationshipwith a larger supplier. The study aims to gain a bigger insight of how acustomer and its supplier perceive and manage the business relationship.

    Methodology

    The study has a qualitative approach and is built on a case-study withinterviews from one supplier and three customers, to gain a biggerinsight of purchasing and to be able to see how each party perceive thebusiness relationship.

    Conclusion

    The results of the study show that medium-sized enterprises work a lot tomake purchasing more efficient and they all believe that purchasing is avalue adding function. Therefore they should not be classified in thesame definition as small-sized enterprises. One of the most importantcomponents in a business relationship is trust and power should not beused.

  • 42.
    Sami, Abdul Wahab
    Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, The Institute of Technology.
    Area Efficient ADC for Low Frequency Application2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Analog to digital converters (ADCs) are the fundamental building blocks in communication

    systems. The need to design ADCs, which are area and/or power efficient, has been common.

    Various ADC architectures, constrained by resolution capabilities, can be used for this purpose.

    The cyclic algorithmic architecture of ADC with moderate number of bits comes out to be

    probably best choice for the minimum area implementation. In this thesis a cyclic ADC is

    designed using CMOS 65 nm technology. The ADC high-level model is thoroughly explored and

    its functional blocks are modelled to attain the best possible performance. In particular, the

    nonlinearities which affect the cyclic/algorithmic converter are discussed. This ADC has been

    designed for built-in-self-testing (BiST) on a chip. It is only functional during the testing phase,

    so power dissipation is not a constraint while designing it. As it is supposed to be integrated as

    an extra circuitry on a chip, its area really matters.

    The ADC is designed as 10-bit fully differential switch-capacitor (SC) circuit using 65nm

    CMOS process with 1.2V power supply. A two stage Operational Transconductance Amplifier

    (OTA) is used in this design to provide sufficient voltage gain. The first stage is a telescopic

    OTA whereas the second is a common source amplifier. The bottom plate sampling is used to

    minimize the charge injection effect which is present in the switches.

  • 43.
    Danielsson, William
    et al.
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Waldmann, Sebastian
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Avoiding Unnecessary 3G Data Transmission Through Mobile Sensors2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In recent years, instant messaging (IM) has started to replace short message service (SMS) in communication. IM offers more functionality but there is a great downside. IM demands more power and drains the mobile device battery faster. This paper shows the energy consumption of  IM when the user is not using the application and how the consumption  can be reduced by enabling mobile sensors and sending fewer packets by the application. We began by investigating the various sensors that are supported by mobile devices. With the retrieved vendor information, we evaluated the different sensors and chose two sensors, light sensor and proximity sensor in order to study their use for reduction of energy in  an instant messaging scenario. These two sensors can together estimate if the mobile device is placed in the pocket of the user. The development of a simple IM application was completed and sensors were used to create an extension to the application. The extension would lengthen the interval between the updates of the automatic update function when the mobile was inactive, reducing the energy consumption.

    Two types of tests were performed. The first test evaluated if the extension would correctly deduce that the mobile device was placed inside a pocket. The mobile device with the pocket-aware application was used in different common situations and the tests showed that the extension made a correct computation in seven of nine situations. The faulty situations were when the mobile device is placed with the screen faced down to a surface. The second test compared the energy consumed by a pocket-aware application compared to a mobile device without our extension. Based on the results that we retrieved, we estimated that during a one minute period the pocket-aware application with an update interval of ten seconds could save on average 12% and could save on average 62% when the update interval was increased to fifteen seconds.

  • 44.
    Andersson, Isak
    et al.
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    Karlsson, Melki
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    Body Coupled Communication: Ändring av prototypkort2014Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Communication using the human body as a transmission medium, the capacitive coupling between the skin and sensor, has been an active research area for PAN (Personal Area Network) since Thomas Guthrie Zimmerman introduced the technique in 1995. The reason for this is to examine the benefits and uses of a communication method that does not emit RF signals and thus reduce the risk of unauthorized interception.

    This report describes a thesis that examines the possibility of elimination of USB to UART converter on Microchip BodyCom through software USB-stack and combine this with Body Coupled Communication functionality in a single microcontroller. Furthermore, studies on if the application code in Body Coupled Communication transmitters can be modified to extend functionality.

    It was given in the conditions that microcontrollers from Microchip should be used, furthermore, low price and low power consumption were important, especially for the transmitter. The method for achieving this has been the use of Microchip BodyCom development kit with USB Microchip low pin count development kit and Microchip USB firmware framework.

    The result was that the USB- to UART-converter could be integrated with Microchip BodyCom, using software USB-stack and a modified program code for BodyCom in a single microcontroller.

    Only your imagination sets the limits for Body Coupled Communication can be used for. For example, it would be possible to exchange electronic business cards by a handshake or open a locked door only by using the handle.

  • 45.
    Polis, Rihards
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, The Institute of Technology. Riga Technical University.
    EnergyBox: Tool improvement and GUI2014Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    EnergyBox is a parametrised estimation tool that uses packet traces as input to simulate the energy consumption of communication in mobile devices. This tool models the transmission behaviour of a smart phone by analysing a recorded packet trace from the device. The purpose of the thesis is to reimplement the original EnergyBox energy consumption modelling tool. The project aims to develop support for a graphical user interface (GUI) and a code base that is easier to modify and maintain.

    The motivation for the reimplementation of the tool is to simplify its usage and to structure the code so that new features can be added. The existing features such as the calculation of total power consumed by the packet trace and the modelling of a device's energy states are reimplemented and new features are developed. Among the new features, a GUI is added to simplify the usage of the application features such as the detection of the recording device's IP address and the ability to alter the configuration parameters used as input to the energy model.

    The application is written with a GUI and modularity in mind. This is achieved using Java's proprietary new GUI framework - JavaFX, which supports built-in chart and graph GUI elements, that can be easily integrated and supported. The energy modelling engines follow the semantics of the original implementation and the evaluation shows that the new implementation's results are identical to the original tool in 94.94% of the tested cases.

  • 46.
    Harrison, Katherine
    et al.
    Linköping University, The Tema Institute, Centre for Gender Studies. Linköping University, Faculty of Arts and Sciences.
    Hearn, JeffLinköping University, The Tema Institute, Centre for Gender Studies. Linköping University, Faculty of Arts and Sciences.
    GEXcel Work in Progress Report Volume VII: Proceedings from GEXcel Theme 2: Deconstructing the Hegemony of Men and Masculinities Spring 20092009Conference proceedings (editor) (Refereed)
    Abstract [sv]

    The contributions to this volume are the result of the activities carried out within the frame of GEXcel’s second research theme, Deconstructing the Hegemony of Men and Masculinities. Most of the authors were GEXcel Visiting Scholars spending varying periods of time at Linköping University to work on their projects between January and June 2009. All the Scholars participated in the GEXcel Conference ‘Men and Masculinities, Moving On! Embodiments, Virtualities, Transnationalisations’ held on 27th – 29th April, 2009. In addition, two presentations from the Conference are included. Most of the conference presentations were published in GEXcel Work-in-Progress Report VI. Some of these presentations were also given at the GEXcel Symposium ‘Men/masculinities, Transnational, Spatial, Virtual: Hegemony, Power and Deconstruction’, held on 5th May, 2009 (see Appendix).

    This volume is of a work-in-progress character, and thus the texts presented here are to be elaborated further. The reader should also be aware that, as this is a report of working papers, some minor editorial modifications have been made to some papers, but the language of those contributed by non-native speakers of English has not been specifically revised.

    We thank Alp Biricik, Berit Starkman and Kjerstin Andersson for all their assistance in the arrangements for Theme 2, and Tomas Hägg for his care with the printing of the text.

  • 47.
    Ewert, Per
    Linköping University, Department of Culture and Communication. Linköping University, Faculty of Arts and Sciences.
    Liv i den övergivna trädgården?: Tro och sekularisering i Sverige, speglad mot dominerande teorier om sekulariseringsprocesser2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This master thesis summarizes contemporary theories on secularization processes in the Western world, and compares these with the example of Sweden, which by many scholars is considered to be the most secularized country in the Western world.

    I do this by dividing the most influential theorists in five different groups. In each group I explain how the theorists formulate and motivate their positions. These groups are:

    1) The secularization paradigm, where secularization always accompanies modernization. (Therorists: Steve Bruce and Peter Berger (in the 1960s)

    2) The paradigm basically accepted, but revised to depend on existential security, rather than modernisation as such. (Pippa Norris and Ronald Inglehart)

    3) Religion returned in the public sphere. (José Casanova)

    4) The paradigm completely revised. (Peter Berger (after 1990), David Martin, Charles Taylor)

    5) The post-secular society. (Jürgen Habermas, plus others)

    After this theoretical overview I compile empirical studies on the Swedish example, mainly using the scholars Eva Hamberg and Magnus Hagevi. Apart from these, I mainly use material from Sverigeräkningen – a study of all church attendances in Sweden at one weekend in 1999; plus recurrent studies from the SOM Institute at Gothenburg University as well as from World Values Survey.

    This essay concludes that there is good reason to think that the secularization paradigm is in need of revising. However, there still seems to be some truth in all these theoretical models, essentially because they do not necessarily contradict each other, as much as they deal with the issue from slightly different perspectives.

    The empirical studies of Sweden indicate that our country is indeed highly secularized. The reasons for this may be found partly in all of the theoretical models used in this essay. It is also argued that there may be good explanatory power in the market model, where secularization comes not only due to lack in demand, but also to a weakened supply of religion.

  • 48.
    Kantzon, David
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Lahti, Sebastian
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Over voltage protection device for ROV2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Supplying power to equipment always imposes a risk of damaging it. This risk is apparent in every application whether it be an industrial or a home appliance. One of these harmful occurrences is something like lightning which introduces a potentially harmful voltage in the system. To reduce the risk of damage significantly an over-voltage protection device is needed. Devices which deal with this problem are common in any electrical equipment and this report deals with the construction and evaluation of one such unit.

    The device or equipment needing protection in this case is an industrial underwater robot built by Ocean Robotics. In order for this robot to operate safely it needs several protective measures where an over-voltage protection system is one of them. This system provides protection against over-voltages appearing on the main cable supplying the robot, where the input voltage ranges from 200 to 600 volts. As the desired voltage output range from the over-voltage system is 250 to 350 volts it must be able to handle significant power in some cases.

    Due to the restrictions on functionality given by the contractor a novel way of achieving the goals was tested. The completed prototype can only dissipate 70 watts of power which is far from the required 1500 watts which was specified in the sheet of requirements. However, this system could be used to protect equipment with lower requirements for power handling capability and with added time and effort it could possibly meet the requirements for this project as well.

  • 49.
    Blomqvist, Suzanne
    Linköping University, Department of Behavioural Sciences and Learning. Linköping University, Faculty of Educational Sciences.
    Med förenade krafter: Arbetsmöten i human servicesektorn2007Report (Other academic)
    Abstract [en]

    In any organization people recurrently meet to exchange information, and to make decisions on how to organize their work in order to fulfil their tasks. Different kinds of work meetings take place in all sectors of working life, also in what is known as the human service sector.

    The aim if this study was to investigate what research on work meetings in human service sector highlights as important influencing factors on how work is performed during meetings. The study is based on research performed on authentic work groups only.

    To make it possible to meet different the needs of the clients most work groups in human service sector are Multiprofessional ones. To be able to make use of the professional diversity in the work group during work meetings on important influencing factor is how influence is distributed between group members, influence over how discussions are held and how decisions are made. The influence of group members seems to be effected by what status an individual holds in the group, level of education and by how much someone talks during the meeting. The influence of a group member is also influenced by the size of the group, and by what method is used in the group to solve differences of opinion.

    Another important influencing factors that is highlighted in literature is the nature of communication during group meetings, especially concerning the possibility to integrate different perspectives and to have a shared vocabulary when discussing clients.

    If the meeting is or is not conducted by a systematic structure to guide discussion and decision-making is another important influencing factor. The influence of well- known group phenomena such as power of the majority, the value of minority dissent, group polarization, and the group think syndrome is also given attention in research literature. Attention is also given to the effects of emotional, subconscious needs of group members on the work performed during work meetings.

    To enhance performance during work meetings in the human service sector one might consider giving attention to the above-described aspects of work meetings. Influence more equally distributed between group members might be accomplished by using a systematic structure guiding discussion and decision-making. Small size groups and a collaborative way to solve differences of opinion might also contribute to an equal distribution of influence during work meetings.

    To facilitate communication during work meetings one might consider using consulteecentered consultation to help the work group reflect on how language is used during meetings.  To reflect on how work is performed during work meetings might also enable a work group to become aware of how emotional, subconscious needs might influence what is accomplished. Innehållsförteckning

  • 50.
    Berg, Christoffer
    et al.
    Linköping University, Department of Social and Welfare Studies. Linköping University, Faculty of Arts and Sciences.
    Olsson, Jonas
    Linköping University, Department of Social and Welfare Studies. Linköping University, Faculty of Arts and Sciences.
    Det roterande chefskapet i Åtvidabergs kommun: En studie av samspelet mellan kommunchefer och politiker ur ett maktperspektiv2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay aims to shed light on the interplay between leaders and politicians at Åtvidabergs municipality, where they have a system of rotating leadership which consists of a group of five leaders where one at the time holds the position of the formal leader at two months intervals. The essay is based on qualitative interviews with both municipality leaders and politicians working in Åtvidaberg. We implement a perspective of power when we analyze our informants statements, especially by relating those to Dennis H. Wrongs forms of power.

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