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  • 1.
    Silversved, Nicklas
    et al.
    Linköping University, Department of Computer and Information Science.
    Runesson, Hampus
    Linköping University, Department of Computer and Information Science.
    A comparison of the security in ZigBee and the IEEE 802.15.9 standard and an experimental analysis of communication over IEEE 802.15.42019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The increasing number of IoT devices used in today’s society has led to a demand for better security in order to prevent attackers from gaining access to private information. The IoT brings a wide application scope and because of that there are a lot of ways to set up a secure network and manage keys in these kinds of networks. This paper presents a comparison between the security model in Zigbee and the new recommended practice for Key Management Protocols defined by the IEEE 802.15.9 standard. We investigate key establishment and transportation together with the vulnerabilities that this might bring regarding potential attacks like DoS and MitM. Since these protocols are built on the IEEE 802.15.4 standard, experimental tests have been made where we analyze the throughput, RTT and packet loss over varied distances and we try to determine the maximum transmission range for devices using IEEE 802.15.4 modules. The IEEE 802.15.9 standard works with different KMPs and depending on the KMP being used we can see both similarities and differences regarding key management and possible attacks when comparing it to ZigBee. Furthermore, we found that attacks on a ZigBee device is more likely to compromise the whole network while similar attacks would only affect the specific peers in an IEEE 802.15.9 communication. Based on the experiments we find that open areas, distance and interference have a negative effect on the throughput, RTT and packet loss of the communication.

  • 2.
    Larsson, Niklas
    et al.
    Linköping University, Department of Computer and Information Science.
    Ågren Josefsson, Fredrik
    Linköping University, Department of Computer and Information Science.
    A study of slow denial of service mitigation tools and solutions deployed in the cloud2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Slow rate Denial of Service (DoS) attacks have been shown to be a very effective way of attacking vulnerable servers while using few resources. This thesis investigates the effectiveness of mitigation tools used for protection against slow DoS attacks, specifically slowheader and slow body. Finally, we propose a service that cloud providers could implement to ensure better protection against slow rate DoS attacks. The tools studied in this thesis are, a Web Application firewall, a reverse proxy using an event-based architecture and Amazon’s Elastic Load Balancing. To gather data a realistic HTTP load script was built that simulated load on the server while using probe requests to gather response time data from the server. The script recorded the impact the attacks had for each server configuration.The results show that it’s hard to protect against slow rate DoS attacks while only using firewalls or load balancers. We found that using a reverse proxy with an event-based architecture was the best way to protect against slow rate DoS attacks and that such a service would allow the customer to use their server of choice while also being protected.

  • 3.
    Danielsson, Benjamin
    Linköping University, Department of Computer and Information Science.
    A Study on Text Classification Methods and Text Features2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    When it comes to the task of classification the data used for training is the most crucial part. It follows that how this data is processed and presented for the classifier plays an equally important role. This thesis attempts to investigate the performance of multiple classifiers depending on the features that are used, the type of classes to classify and the optimization of said classifiers. The classifiers of interest are support-vector machines (SMO) and multilayer perceptron (MLP), the features tested are word vector spaces and text complexity measures, along with principal component analysis on the complexity measures. The features are created based on the Stockholm-Umeå-Corpus (SUC) and DigInclude, a dataset containing standard and easy-to-read sentences. For the SUC dataset the classifiers attempted to classify texts into nine different text categories, while for the DigInclude dataset the sentences were classified into either standard or simplified classes. The classification tasks on the DigInclude dataset showed poor performance in all trials. The SUC dataset showed best performance when using SMO in combination with word vector spaces. Comparing the SMO classifier on the text complexity measures when using or not using PCA showed that the performance was largely unchanged between the two, although not using PCA had slightly better performance

  • 4.
    Olsson, Linn
    Linköping University, Department of Computer and Information Science.
    AI-systems möjligheter i enavancerad support- och industrikontext2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A case studie at Siemens supportorganisation is studied and the possibilities to use an AI-system for improvements. This is studied with theories in distributed cognition and what is available in AI-systems such as chatbots. Through contextual inquiry, which is a part of the method Contextual Design, affinity diagrams were made and a analysis through DiCoT to create a relevant image. This is used to discuss consequences for the design of an AI-system that the supporttechnicians need.  Through the result the many systems that the supporttechnicians use are illustrated and how they depend on eachother to solve difficulties. In the conclusion different suggestions are made about a AI-system for the support technicians but also an alternative that is customer related.

  • 5.
    Wallin, Moa
    Linköping University, Department of Computer and Information Science.
    Ambiguous synonyms: Implementing an unsupervised WSD system for division of synonym clusters containing multiple senses2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    When clustering together synonyms, complications arise in cases of the words having multiple senses as each sense’s synonyms are erroneously clustered together. The task of automatically distinguishing word senses in cases of ambiguity, known as word sense disambiguation (WSD), has been an extensively researched problem over the years. This thesis studies the possibility of applying an unsupervised machine learning based WSD-system for analysing existing synonym clusters (N = 149) and dividing them correctly when two or more senses are present. Based on sense embeddings induced from a large corpus, cosine similarities are calculated between sense embeddings for words in the clusters, making it possible to suggest divisions in cases where different words are closer to different senses of a proposed ambiguous word. The system output is then evaluated by four participants, all experts in the area. The results show that the system does not manage to correctly divide the clusters in more than 31% of the cases according to the participants. Moreover, it is discovered that some differences exist between the participants’ ratings, although none of the participants predominantly agree with the system’s division of the clusters. Evidently, further research and improvements are needed and suggested for the future.

  • 6.
    Tinnerholm, John
    Linköping University, Department of Computer and Information Science.
    An LLVM backend for the Open Modelica Compiler2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis presents the construction and evaluation of an LLVM based codegenerator, an LLVM backend. The introduction of an LLVM based backend into the OpenModelica compiler was done to examine the advantages and disadvantages of compiling Modelica and MetaModelica to LLVM IR instead of C. To answer this question, the LLVM backend was compared against the existing interpreter and C code generator using four different schemes with corresponding cases. This comparison was made both for both optimised and unoptimised code. From the experiments, it was concluded that an LLVM backend can be used to improve runtime and compile time performance in the OpenModelica Interactive environment.

  • 7.
    Krig, Billy
    Linköping University, Department of Computer and Information Science.
    Analysis and Optimization of the User Interface for an Effective Altruism Charity Application: Implementing gamification with the purpose to enhance user engagement and increase user retention2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Gamification has previously demonstrated successful results when it comes to increasing the user retention rate in many different sectors. Non-profit charity organisations have for the last 10 years had a retention rate that is below 50%. This thesis investigates the possibility of increasing the user retention rate in the non-profit charity application The Life You Can Save(TLYCS) by implementing gamification. The gamification mechanic that was chosen for implementation was achievements. To measure understandability the Post-Study System Usability Questionnaire was used, the four satisfaction scores of the questionnaire were measured with a number between one and seven. Sven represented the highest number and one represented the lowest number. All four satisfaction scores had an average number that was higher than 6. Because of the previously proved successful results of gamification and a usable implementation of achievements in the mobile application TLYCS the possibility of an increased user retention rate is assessed to be high. 

  • 8.
    Paulsén, Rickard
    Linköping University, Department of Computer and Information Science.
    Användning av spel för att utbilda och engagera människor om klimatförändringarna2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Följande studie har genomförts i syfte att undersöka om spelande i samband med klimatinformerande påverkade och motiverade deltagaren mer till klimatagerande jämfört med då deltagaren endast fick läsa information om klimatet. Detta undersöktes med hjälp av en spelprototyp som skapats i detta syfte. Spelprototypen skapades i Scratch, vilket är ett interpreterande dynamiskt visuellt programmeringsspråk, och spelet innehöll tre olika nivåer. Mellan dessa nivåer så fick deltagaren information om klimatet som var relaterat till nivån de precis spelat. Efter att ha gjort experimentet skulle deltagaren besvara en enkät, som innehöll frågor där deltagaren skulle uppskatta, med hjälp av likertskalor, om denne kände sig påverkad och motiverad. Svaren på enkäten analyserades med ett Mann Whitney U test. Resultaten från dessa frågor var inte signifikanta, och därför kan inga slutsatser dras om spelet i samband med informationen hade en positiv påverkan. Även om resultaten inte var signifikanta så bör ytterligare forskning utföras inom ämnet, då tidigare forskning visat hur spel kan påverka beteende, och hur människors klimatagerande kan påverkas till det bättre genom spel.

  • 9.
    Algvere, Ebba
    Linköping University, Department of Computer and Information Science.
    Att designa effektivt lärande med blandade lärmiljöer: Hur lärmiljöer och dess aktiviteter inom blandade lärmiljöer påverkar kunskapsutveckling och förtroende för organisationen2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Denna studie har undersökt hur olika lärmiljöer inom ett utbildningsupplägg med blandade lärmiljöer skiljer sig i upplevelse, kunskapsutveckling samt förtroende. Vidare har studien undersökt om det finns någon skillnad mellan grupper, med prefererad ordning på lärmiljöer inom ett utbildningsupplägg med blandade lärmiljöer, och prefererad inläringsstil. Fyra olika inläringsstilar, av Honey och Mumford (2000), har använts i studien. Frågeställningarna har undersökts och besvarats genom en triangulering, en kombination av kvalitativa och kvantitativa metoder. Kvalitativ data har samlats in genom semistrukturerade intervjuer och har sedan följt en tematisk analysprocess. Kvantitativ data har erhållits genom ett frågeformulär som sedan har analyserats med statistiska tester. Resultaten från den kvalitativa intervjudelen har visat på att olika lärmiljöer, e-lärande och föreläsning, skiljer sig samt kompletterar varandra med avseende på upplevelse, kunskapsutveckling och förtroende för arbetsgivare. Kvantitativa resultat från frågeformulär har visat på att det inte finns någon signifikant skillnad mellan grupper, som föredrar att börja ett utbildningsupplägg med blandade lärmiljöer med olik första lärmiljö, och styrka i prefererad inläringsstil. Detta innebär att det inte finns någon direkt koppling mellan föredragen ordning på lärmiljöer inom blandade lärmiljöer och prefererad inläringsstil. Denna studie har studerat ett kunskapsgap för hur blandade lärmiljöer bör struktureras. Studiens fynd kan därmed bidra till en bättre förståelse för hur framtida utbildningsupplägg med blandade lärmiljöer bör designas för effektivt lärande och maximal kunskapsutveckling.

  • 10.
    Carolina, Löf
    Linköping University, Department of Computer and Information Science.
    Att mäta stress: Adaptering och validering av Dundee Stress State Questionnaire2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to adapt and validate the Dundee Stress State Questionnaire (DSSQ), which measures stress based on 12 scales that cohere around three higher order dimensions: task engagement, distress and worry. DSSQ is adapted from its original language, English, to Swedish. The applicability of the Swedish version of DSSQ is tested by studying the questionnaire's reliability and validity, and by applying the survey in two different contexts, where two different tasks are performed, a work memory task and a police student exam task.

    Overall, the result showed that the Swedish adaptation of DSSQ has high reliability. However, it was not possible to confirm that the Swedish adaptation of DSSQ maintained the same factor model as the original DSSQ has. The statistical analysis showed the changes identified in the participants' moods partly in lines with previous research. The conclusion is that more participants are needed to validate the factor model for the Swedish adaptation of DSSQ and since the Swedish adaptation of DSSQ shows good reliability, it can be applied in research.

  • 11.
    Albrektson, Maja
    Linköping University, Department of Computer and Information Science.
    Att skapa en användarcentrerad återkopplingsrapport: En designprocess kring data2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Människor utsätts för mer information än någonsin tidigare. För att underlätta processandet av information är det viktigt att presentera informationen på rätt sätt - anpassat efter användaren. Detta projekt genomfördes i samarbete med Linköpings kommun och det övergripande syftet var att undersöka hur man kan utforma ett gränssnitt för de återkopplingsrapporter som ska nå ut till anställda på företaget. För den första frågeställningen “Vad önskar förvaltningarna för information/data i en återkopplingsrapport?” valdes en kvalitativ ansats och en tematisk analys utfördes utifrån data från nio intervjudeltagare som arbetade på kommunen. Analysen visade att den data förvaltningarna var mest intresserad av handlade om volym, kategorier, vidarekopplingar, service och jämförelser med andra förvaltningar. Resultaten av den tematiska analysen lade även grunden för att besvara resterande två frågeställningar - “Hur bör denna information visualiseras för att den lättast ska kunna förstås och användas?” samt “Hur skulle ett gränssnitt för återkopplingsrapporten till förvaltningarna kunna se ut?”. För att besvara dessa frågeställningar presenterades tidigare forskning om hur rapporter utformas idag och teori kring existerande gestaltlagar samtidigt som det producerades en persona, kontextscenarier, en kravspecifikation samt skisser och en temporär prototyp av dashboard-karaktär.

  • 12.
    Uppugunduri, Arun
    et al.
    Linköping University, Department of Computer and Information Science.
    Hansen, Daniella
    Linköping University, Department of Computer and Information Science.
    Barkino, Delmon
    Linköping University, Department of Computer and Information Science.
    Jeppsson, Emmelie
    Linköping University, Department of Computer and Information Science.
    Öst, Ellinor
    Linköping University, Department of Computer and Information Science.
    Conner, Gustaf
    Linköping University, Department of Computer and Information Science.
    Fredriksson, Henrik
    Linköping University, Department of Computer and Information Science.
    Kull, Nicklas
    Linköping University, Department of Computer and Information Science.
    Att utforma en e-handel för kvinnor med god navigerbarhet2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    After conducting a survey at Linköping University it was shown that few women choose to use protein powder. The same survey also showed that only a fraction of these women possessed knowledge regarding their optimal protein consumption. A web application that sells protein and training related products were therefore developed. This application is designed to have satisfactory navigability and an appealing graphic profile for women. The navigability is intended to, in an efficient manner, eliminate the information gap regarding protein supplements for the intended target group. The web application’s functionality anddesign has been based on scientific theory. Development occurred in iterations after which end users had the possibility to test and leave suggestions for improvements. Improvements to the web application’s navigability has been measured in numerous aspects through all iterations. Time, lostness and certainty have been central for the configuration of the final version of the web application. This report enhances the group’s thesis and exhibits that a web application can have good navigability and be graphically appealing to women.

  • 13.
    Westfelt, Vidar
    et al.
    Linköping University, Department of Computer and Information Science.
    Aleksandrauskas, Arturas
    Linköping University, Department of Computer and Information Science.
    Automated migration of large-scale build systems2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Upgrading or migrating a build system can be a daunting task. Complete build system migration requires significant effort. To make the process more effective, we automated the first steps of migration, and attempted to analyze the new build results to find anomalies. Our findings show promise for automation as a first step of migration, and we see that automated evaluation could have some potential.

  • 14.
    Olsson, Oskar
    et al.
    Linköping University, Department of Computer and Information Science.
    Eriksson, Moa
    Linköping University, Department of Computer and Information Science.
    Automated system tests with image recognition: focused on text detection and recognition2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today’s airplanes and modern cars are equipped with displays to communicate important information to the pilot or driver. These displays needs to be tested for safety reasons; displays that fail can be a huge safety risk and lead to catastrophic events. Today displays are tested by checking the output signals or with the help of a person who validates the physical display manually. However this technique is very inefficient and can lead to important errors being unnoticed. MindRoad AB is searching for a solution where validation of the display is made from a camera pointed at it, text and numbers will then be recognized using a computer vision algorithm and validated in a time efficient and accurate way. This thesis compares the three different text detection algorithms, EAST, SWT and Tesseract to determine the most suitable for continued work. The chosen algorithm is then optimized and the possibility to develop a program which meets MindRoad ABs expectations is investigated. As a result several algorithms were combined to a fully working program to detect and recognize text in industrial displays.

  • 15.
    Lehto, Niko
    et al.
    Linköping University, Department of Computer and Information Science.
    Sjödin, Mikael
    Linköping University, Department of Computer and Information Science.
    Automatic text summarization of Swedish news articles2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    With an increasing amount of textual information available there is also an increased need to make this information more accessible. Our paper describes a modified TextRank model and investigates the different methods available to use automatic text summarization as a means for summary creation of swedish news articles.

    To evaluate our model we focused on intrinsic evaluation methods, in part through content evaluation in the form of of measuring referential clarity and non-redundancy, and in part by text quality evaluation measures, in the form of keyword retention and ROUGE evaluation.

    The results acquired indicate that stemming and improved stop word capabilities can have a positive effect on the ROUGE scores. The addition of redundancy checks also seems to have a positive effect on avoiding repetition of information. Keyword retention decreased somewhat, however. Lastly all methods had some trouble with dangling anaphora, showing a need for further work within anaphora resolution.

  • 16.
    Widerberg, Lisa
    Linköping University, Department of Computer and Information Science.
    Behov relaterade till välfärdsteknik i svensk hemtjänst i ordinärt boende2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Personalresurserna inom Sveriges äldreomsorg förutspås inte växa i samma takt som Sveriges befolkning över 80 år ökar, ett problem som de flesta är enade om måste adresseras. I ljuset av påtaglig utveckling inom områden som smarta hem och artificiell intelligens samt den nationella satsningen på välfärdsteknik som ett potentiellt svar på problemen är det högst relevant att utforska vilka behov som i dagsläget inte är tillgodosedda i svensk hemtjänst. Denna studie syftar till att identifiera existerande behov inom svensk hemtjänst i ordinärt boende relaterade till välfärdsteknologi samt identifiera faktorer som bör tas i hänsyn vid design för hemtjänstens verksamheter. Genom en kvalitativ ansats och människocentrerad design identifieras problematik i äldreomsorgen via semistrukturerade intervjuer och tematisk analys. Utifrån resultatet av den tematiska analysen identifierades åtta stycken olika behov relaterade till informationsbrist, brist på individanpassning och flexibilitet samt brist på proaktivt arbete. Tekniska områden som smarta hem och AI tycks erbjuda intressanta möjligheter att effektivt tillgodose dessa behov. Flertalet faktorer som är viktiga att ta i hänsyn vid design för studiens tre målgrupper presenteras.

  • 17.
    Fredriksson Franzén, Måns
    et al.
    Linköping University, Department of Computer and Information Science.
    Sandberg, Kristoffer
    Linköping University, Department of Computer and Information Science.
    Beneficial Limitations: Rate caps for Enhanced Branched Video Streaming Experience2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

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

  • 18.
    Jaeger Tronde, Emma
    Linköping University, Department of Computer and Information Science.
    Chefers behov vid verksamhetsstyrning: En utredande kravanalys inför ett digitalt beslutsstöd2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Det råder en situation på arbetsplatser där fler och fler system förväntas tillämpas i arbetslivet. Linköpings kommun ingår just nu i en digital satsning för att påverka anställdas arbetssätt och arbetsbörda och den här studien är en utveckling av ett projekt som utförts tidigare inom kommunen. Studiens syfte var att undersöka arbetssättet som en grupp chefer tillämpar vid verksamhetsstyrning. Genom en kravanalys identifierades chefernas behov och krav de har på ett framtida digitalt beslutsstöd som kan användas vid just verksamhetsstyrning. Dessutom syftade studien till att undersöka chefernas användning av digitala verktyg och deras attityder gentemot digitalisering av arbetsprocesser. Det nuvarande arbetssättet uppfattades som tryggt men också långsamt med eftersatta strukturer. Chefernas upplevelse är att detta hindrar möjligheten att hjälpa fler personer. Tillika har de positiva attityder gentemot digitalisering då det har förutsättningen att förenkla arbetsprocesser. Däremot bemöts de idag av långa och krångliga vägar till information som tar energi från huvudsakliga uppgifter. Som konsekvens har egna påhittade strukturer skapats för att täcka upp för de rådande bristerna i de befintliga systemen. Förhoppningen på ett nytt digitalt beslutsstöd är att det inte ska vara ännu ett till verktyg, utan att det bemöta de problemen och bristerna som idag orsakar att digitala verktyg inte upplevs som hjälpmedel. Resultatet för denna studie är relevant för att utifrån ett användarcentrerat perspektiv ge de digitala verktygen ett mervärde och som kan förenkla och effektivisera arbetsprocesser och således också förbättra den digitala arbetsmiljön.

  • 19.
    Andell, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Cole, Nigel
    Linköping University, Department of Computer and Information Science.
    Karlsson, Wiktor
    Linköping University, Department of Computer and Information Science.
    Lilja, Eric
    Linköping University, Department of Computer and Information Science.
    Rezaie, Diba
    Linköping University, Department of Computer and Information Science.
    Thimren, David
    Linköping University, Department of Computer and Information Science.
    Zeijlon, Andreas
    Linköping University, Department of Computer and Information Science.
    CI/CD i molnapplikationer som Google Cloud, Azure och AWS2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Under VT 2019 ägde projektet rum varav denna rapport är ett av resultaten. Projektets mål var att skapa en CI/CD pipeline vars syfte var tänkt att frekvent kunna leverera färdigtestad kod till olika molntjänster som Google Cloud Platform, Amazon Web Services och Azure. Projektspecifikationerna gavs av företaget Skira för att skapa en snabbare integrationsprocess för nya utvecklare. Detta så en ny utvecklare skulle kunna lägga mer tid på att koda istället för att gräva ner sig i leverans-/testningsprocessen. Slutprodukten ger företag möjligheten att koda direkt på sitt utvecklingskluster.

  • 20.
    Karlsson, Tobias
    Linköping University, Department of Computer and Information Science.
    Climate change beliefs and attitudes relationship to informational influences and demographic factors2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One of the biggest challenges for the modern society is that of climate change. Despite the growing accumulation of scientific evidence that points towards a strong need for action to be made regarding anthropogenic (human made) climate change, there is a lack of unity in what actions are needed and an outspread passivity amongst both establishments and the public. The reason behind this is attributed to lack of belief in anthropogenic climate change, and lack of pro-environmental attitudes amongst the public. Furthermore, these issues have been found to relate to identity related beliefs and attitudes that conflict with pro-environmental beliefs and attitudes, where political orientation has proven to be a strong factor. One way of dealing with these issues could be through informational influences. By presenting people to information shaped in different ways, one could increase the belief in anthropogenic climate change and pro-environmental attitudes. This study examined the relationship between three different informational influences, and its potential effect on climate change beliefs and attitudes. Furthermore, this study examined the relationship between demographic factors such as age, gender and political orientation with regards to their potential effect on climate change beliefs and attitudes. 449 participants completed a survey with intent to measure the potential effects informational influences and demographic factors had on climate change beliefs and attitudes. Despite that indications where found, no significant results could be identified for the informational influences. All demographic factors had some significant effect on climate change beliefs or attitudes, where political orientation was the strongest influencing factor. This relates to earlier research and further implications were discussed for future studies.

  • 21.
    Seger, Johanna
    Linköping University, Department of Computer and Information Science.
    Coagency of humans and artificial intelligence in sea rescue environments: A closer look at where artificial intelligence can help humans maintain and improve situational awareness in search and rescue operations2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This paper aims to answer the question of how artificial intelligence could help humans maintain and/or improve situational awareness in search and rescue operations at sea, as well as where in such processes artificial intelligence could be incorporated to most efficiently compensate for human vulnerabilities and support human strengths. In order to answer this, a joint cognitive system perspective has been adopted whilst joining in search and rescue practice operations. These operations have been observed and persons participating in them have been interviewed, in order to gather insights about the process and the persons conducting it. The results from these insights coupled with experience with artificial intelligence and automation, show that artificial intelligence could help improve and/or maintain situational awareness by adopting functions which take up unnecessary time from man. According to the joint cognitive system view, these functions should never be solely performed by artificial intelligence however, but in coagency with man; allocated functions should overlap between man and machine. Suggestions have been given regarding which functions in particular an artificial intelligent agent could perform in terms of search and rescue and where these functions occur in the process. None of these suggestions are without man involvement, as they should not be. To summarise, these suggestions include; a UAV equipped with an infrared camera to search large areas quickly, a decision support system equipped with image recognition to analyse images gathered from the UAV, as well as a communication tool which allows for shared search patterns and hotspots between search and rescue units.

  • 22.
    Grönberg, David
    et al.
    Linköping University, Department of Computer and Information Science.
    Denesfay, Otto
    Linköping University, Department of Computer and Information Science.
    Comparison and improvement of time aware collaborative filtering techniques: Recommender systems2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Recommender systems emerged in the mid '90s with the objective of helping users select items or products most suited for them. Whether it is Facebook recommending people you might know, Spotify recommending songs you might like or Youtube recommending videos you might want to watch, recommender systems can now be found in every corner of the internet. In order to handle the immense increase of data online, the development of sophisticated recommender systems is crucial for filtering out information, enhancing web services by tailoring them according to the preferences of the user. This thesis aims to improve the accuracy of recommendations produced by a classical collaborative filtering recommender system by utilizing temporal properties, more precisely the date on which an item was rated by a user. Three different time-weighted implementations are presented and evaluated: time-weighted prediction approach, time-weighted similarity approach and our proposed approach, weighting the mean rating of a user on time. The different approaches are evaluated using the well known MovieLens 100k dataset. Results show that it is possible to slightly increase the accuracy of recommendations by utilizing temporal properties.

  • 23.
    Sestorp, Isak
    et al.
    Linköping University, Department of Computer and Information Science.
    Lehto, André
    Linköping University, Department of Computer and Information Science.
    CPDLC in Practice: A Dissection of the Controller Pilot Data Link Communication Security2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

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

  • 24.
    Lam, Benny
    et al.
    Linköping University, Department of Computer and Information Science.
    Nilsson, Jakob
    Linköping University, Department of Computer and Information Science.
    Creating Good User Experience in a Hand-Gesture-Based Augmented Reality Game2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The dissemination of new innovative technology requires feasibility and simplicity. The problem with marker-based augmented reality is similar to glove-based hand gesture recognition: they both require an additional component to function. This thesis investigates the possibility of combining markerless augmented reality together with appearance-based hand gesture recognition by implementing a game with good user experience.

    The methods employed in this research consist of a game implementation and a pre-study meant for measuring interactive accuracy and precision, and for deciding upon which gestures should be utilized in the game. A test environment was realized in Unity using ARKit and Manomotion SDK. Similarly, the implementation of the game used the same development tools. However, Blender was used for creating the 3D models.

    The results from 15 testers showed that the pinching gesture was the most favorable one. The game was evaluated with a System Usability Scale (SUS) and received a score of 70.77 among 12 game testers, which indicates that the augmented reality game, which interaction method is solely based on bare-hands, can be quite enjoyable.

  • 25.
    Haglund, Carl
    et al.
    Linköping University, Department of Computer and Information Science.
    Söderholm, Gustaf
    Linköping University, Department of Computer and Information Science.
    Wase, Jonathan
    Linköping University, Department of Computer and Information Science.
    Al-Hashimi, Mustafa
    Linköping University, Department of Computer and Information Science.
    Norsbo, My
    Linköping University, Department of Computer and Information Science.
    Skoglund, Oskar
    Linköping University, Department of Computer and Information Science.
    Wrede, Simon
    Linköping University, Department of Computer and Information Science.
    Dashboard för kirurgiska avdelningar2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta är en kandidatrapport utfärdad av sju studenter i kursen Kandidatprojekt i programvaruutveckling, TDDD96, på Linköpings universitet. Rapporten innefattar en sammanfattning av det arbete som har utförts i detta projekt. Slutprodukten resulterade i en dashboard som underlättar planeringen kring operationssalar för Region Östergötland. Produkten är en webbapplikation utvecklad i ramverket Angular. Utöver arbetet besvaras vad för värde som skapas för kunden, vilka intressanta erfarenheter, vad för stöd ges av en systemanatomi och hur ett planeringsverktyg som Asana underlättar, i ett mjukvaruprojekt. Slutsatserna av rapporten förklarar att produkten är redo att ersätta befintliga system hos kunden, samt med stor sannolikhet kommer att förbättra arbetsförhållanden för personalen hos kunden. Erfarenheter, som att arbeta i grupp och tekniska kunskaper kring webbutveckling, har införskaffats under projektets gång. En systemanatomi konstaterades att ha en positiv påverkan på projektet, genom att ge en bättre överblick och underlättade uppdelningen vid parallellutveckling. Slutsatsen av att använda ett planeringsverktyg visar att det har varit till stor hjälp under utvecklingen, främst för att fördela arbete som ska göras mellan gruppmedlemmarna och utvärdera vad som har gjorts. Planeringsverktyget ser också till att inget dubbelt arbete sker. I rapporten finns också individuella delar skrivna av gruppmedlemmarna, dessa innehåller djupgående analyser av olika ämnen.

  • 26.
    Schmidt, Simon
    et al.
    Linköping University, Department of Computer and Information Science.
    Nils, Tyrén
    Linköping University, Department of Computer and Information Science.
    Design of an interactive authoringtool for creating branchedvideo: Design av ett interaktivt författarverktyg för att skapa grenadevideor2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    With the release of ”Bandersnatch” in 2018, an interactive movie where the viewermakes choices that affects the outcome of the story, we know that successful interactivemovies are possible and appreciated. Although this technology already exists the possibilitiesare seemingly limitless. Perhaps in the future, movies could take certain paths basedon a predetermined profile of a viewer or by scanning facial expressions during the filmto determine what path that best suits the viewer. Interactive films and videos allows theviewer to interact with the storyline of the video. This technique is interesting from boththe user and developer perspective and introduces new challenges. To be able to have anoverview of the different possible branches of the video is helpful and needed in developmentof the media player and the branched video. When different possibles paths of thevideo emerges it can be difficult to keep track of all the different story lines. In this thesis,we make significant improvements to an existing authoring tool for a branched videoplayer. The authoring tool is to be used along side with a media player in order to facilitatethe development of a non-linear branched video. We will also be exploring what featuresof the authoring tool offer the most value to the user.

  • 27.
    Cromsjö, Mimmi
    et al.
    Linköping University, Department of Computer and Information Science.
    Christensson, Martin
    Linköping University, Department of Computer and Information Science.
    Design of video player and user interfaces for branched 360 degree video2019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Branched video enables users to interact with the video content and to choose a unique path through that content. With the further development of Virtual Reality (VR) technology the integration of branched video in these systems becomes increasingly convincing. This thesis develops a 360 degree branched video player in Unity Editor and three different user interfaces (UI) tailored for the needs of branched 360 degree video content, both the design and implementation focus on the aspects of usability. To expedite development of the UIs ,a preliminary user study was conducted to identify a promising design direction. From the study it was established that plain buttons with descriptive text attached, anchored in front of the field of view at the time of appearing, was to be preferred for the selection of the subsequent branch. This design was preferred both in a short motion picture and exploratory film setting. However, world-space anchored symbols as depicted to appear transporting the user to that world-space location showed promise in an exploratory video setting. Based on the result of the study and subjective feedback from study participants, additional features was implemented to the user interfaces. Lastly, further development of both features for the user interface, tools regarding the video player, and a follow-up user study are suggested.

  • 28.
    Hjalmarsson, Johanna
    Linköping University, Department of Computer and Information Science.
    Designa ett gränssnitt för enkel installation: Informationsarkitektur, mentala modeller och användarcentrerat arbetssätt2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

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

  • 29.
    Björnqvist, Anton
    Linköping University, Department of Computer and Information Science.
    Det perifera seendets betydelse bland gångtrafikanter i naturlig miljö2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The importance, and the role, of peripheral vision amongst pedestrians, is an area which for a long time has remained unexplored. Previous studies regarding peripheral vision and pedestrians have mostly studied the characteristics of peripheral vision, the general visual behaviours amongst pedestrians and whether people affected by a natural loss of peripheral vision fixate on different objects compared to those with normal vision. To examine the role of peripheral vision amongst pedestrians, an experiment consisting of 20 participants was conducted. The experiment took place in a car park, where head movements (i.e. how many times each participant moved their head) and head directions (i.e. in which direction the participants’ moved their heads) of the participants were recorded using three action cameras. Two of the cameras were mounted on a helmet which the participants used during the experiment. The third camera was in the hands of the experimenter, recording the participants from behind.

    The experiment consisted of four different conditions. Two conditions where the participants’ peripheral vision was blocked to different extents, one with no manipulation of the visual field and one where the participants were told to watch a video on a cell phone during the walk. The results demonstrated a significant difference in the number of head movements between all four conditions. Furthermore, the results also demonstrated a significant difference in the relative frequency of downwards head directions between the first three conditions. After the experiment, the participants answered a short survey which included questions related to each condition. The answers from the survey showcased, amongst other things, that the participants thought that the condition where their peripheral vision was blocked to the largest extent was the most difficult one. A thematic analysis was conducted based on the recordings of a think-aloud-protocol which the participants were told to conduct during the experiment. The thematic analysis demonstrated, amongst other things, that the participants thought that the condition performed with no manipulation of the visual field was easy, that they felt insecure when their peripheral vision was blocked and therefore had to increase the number of head movements, and that they sometimes felt the need to redirect their gaze away from the cell phone during that condition.

    The conclusion which can be drawn based on the results is that the peripheral vision is widely used amongst pedestrians in natural settings, which in part is based on the fact that the participants increased their number of head movements when their peripheral vision was limited and by their own expressed thoughts regarding the different conditions. However, the results are not able to explain exactly how the peripheral vision is used amongst pedestrians.

  • 30.
    Soames, Kieron
    et al.
    Linköping University, Department of Computer and Information Science.
    Lind, Jonas
    Linköping University, Department of Computer and Information Science.
    Detecting Cycles in GraphQL Schemas2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    GraphQL is a database handling API created by Facebook, that provides an effective al-ternative to REST-style architectures. GraphQL provides the ability for a client to spec-ify exactly what data it wishes to receive. A problem with GraphQL is that the freedomof creating customized requests allows data to be included several times in the response,growing the response’s size exponentially. The thesis contributes to the field of GraphQLanalysis by studying the prevalence of simple cycles in GraphQL schemas. We have im-plemented a locally-run tool and webtool using Tarjan’s and Johnson’s algorithms, thatparses the schemas, creates a directed graph and enumerates all simple cycles in the graph.A collection of schemas was analysed with the tool to collect empirical data. It was foundthat 39.73 % of the total 2094 schemas contained at least one simple cycle, with the averagenumber of cycles per schema being 4. The runtime was found to be on average 11 mil-liseconds, most of which consisted of the time for parsing the schemas. It was found that44 out of the considered schemas could not be enumerated due to containing a staggeringamount of simple cycles. It can be concluded that it is possible to test schemas for cyclicityand enumerate all simple cycles in a given schema efficiently.

  • 31.
    Cao, Linqi
    Linköping University, Department of Computer and Information Science.
    Developing an experiential design approach to gain understanding about foreign culture: challenges and solutions2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    China’s economy is growing. It has been said that “the question like ‘how to do business with Chinese people’ have occupied the minds of international business people who are planning to enter China.” (Fan & Zigang, 2004). Sweden as a country which listed China as its largest trading partner in Asia and a priority country in Sweden's export strategy, has a need to gain understanding about guanxi –an important concept in Chinese business culture. In this thesis, the author will present the development of three exercises inspired by design methods (role play, visualization and customer journey map) which aim to help Swedish business managers to learn guanxi in an experiential way. It includes the challenges the design team went through, how did they solve it and what are the latest version of the exercises looks like. The main challenges presented in this thesis are: how to embed specific knowledge smoothly into exercise; how to set up the role of facilitator(s); and how to increase the level of satisfaction for the users. Those challenges are not only specific to our project, but also could be inspirational for other people (e.g. designers, business culture scholars and so on) who want to create similar exercises or looking for new ways to deliver the knowledge about cross-cultural business communication.

  • 32.
    Ayoub, Yohan
    et al.
    Linköping University, Department of Computer and Information Science.
    Barr, Viktor
    Linköping University, Department of Computer and Information Science.
    Fallström, Johan
    Linköping University, Department of Computer and Information Science.
    Gustavsson, Simon
    Linköping University, Department of Computer and Information Science.
    Jirénius, Martin
    Linköping University, Department of Computer and Information Science.
    Olausson, Jacob
    Linköping University, Department of Computer and Information Science.
    Rashid, Arin
    Linköping University, Department of Computer and Information Science.
    Digital 3D-rekonstruktion av personskador2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport behandlar ett arbete utfört under kursen TDDD96 Kandidatprojekt i programvaruutveckling vid Linköpings Universitet. Arbetet är efterfrågat av Nationellt Forensiskt Centrum (NFC) och utfört av 7 datateknologstudenter. Arbetet bestod i att ta fram och utveckla ett färdigt program som ska göra det enkelt för kriminaltekniker och obducenter att rekonstruera personskador samt presentera det på ett pedagogisk sätt.

  • 33.
    Ganestål, Teodor
    et al.
    Linköping University, Department of Computer and Information Science.
    Palmborg, André
    Linköping University, Department of Computer and Information Science.
    Royo, Adrian
    Linköping University, Department of Computer and Information Science.
    Stenberg, William
    Linköping University, Department of Computer and Information Science.
    Stenvall, Olle
    Linköping University, Department of Computer and Information Science.
    Winneroth, Juliette
    Linköping University, Department of Computer and Information Science.
    Yahya, Sami S.
    Linköping University, Department of Computer and Information Science.
    Digital Tvilling: Visualisering av personlig hälsodata2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta projekt är givet som ett kandidatarbete i mjukvaruutveckling vid Linköpingsuniversitet, i kursen TDDD96 Kandidatprojekt i programvaruutveckling. Arbetet är utfört aven grupp tredjeårsstudenter på D- och U-programmen.Projektet ges av forskargruppen för integrerad systembiologi på IMT LiU, som utvecklarmatematiska modeller av biologiska system. Dessa modeller kan användas för att förståsystemen bättre, eller som beslutsstöd inom farmakologi och vård. Forskargruppens fokusför tillfället är att sammankoppla modeller för olika delar av människokroppen till en helhetsbildsom beskriver delsystemens samverkan.Denna helhetsbild för en särskild individs hälsotillstånd kallas för en digital tvilling, förvilken detta projekt ämnar framställa ett användargränssnitt.Användargränssnittet skall erbjuda grafer över hälsoparametrars förändring över tid,och användaren ska kunna ta fram olika sådana genom att interagera med gränssnittet.Utöver framtagning av själva gränssnittet, skall en brygga mellan applikationen ochkundens modeller tas fram. Detta har gjorts genom en version av programmet OpenCOR,vilket forskarna använder sig av, som exponerar ett API i Python. Detta API sammankopplatmed en server kallas i projektet för motor.

  • 34.
    Linnarsson, Henrik
    Linköping University, Department of Computer and Information Science.
    Digitalt stöd för personer med ADHD: Hur en digital tjänst bör utformas och anpassas2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    An interview study was carried out together with the company Usify who are developing a treatment program for adults diagnosed with ADHD. The study had six participants who were diagnosed with either ADHD or ADD. The aim of the study was to hear what experiences the participants had after using the material consisting of videos, texts and audio files that had been made for the treatment program. In this material there were explanations of the different difficulties that ADHD give rise to and practical ways to cope with these. The interviews were analyzed using thematic analysis which resulted in eight themes that reflected the participants experiences, opinions and reflections regarding the material. In som cases the participants agreed with each other whereas they disagreed in others. They were positive regarding some aspects of the material and negative regarding others. Based on the results the discussion elaborates on how Usify can go about to design a service that meets user needs and requests. One of the important findings was that in order to have the user motivated to use the service the videos and texts must be kept short, but at the same time there must be depth to the information that gives new insights and understanding to the user. This information should be given in both text- and video format since the two formats have different strengths compared to each other.

  • 35.
    Zedén Yverås, Felix
    et al.
    Linköping University, Department of Computer and Information Science.
    Ström, Filip
    Linköping University, Department of Computer and Information Science.
    DNS Performance: A study of free, public and popular DNS servers in 20192019Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The Domain Name System (DNS) is an integral part of making the internet a more human-friendly place. However, it comes with the cost of an added abstraction layer that introduces extra latency in many aspects of the modern computing experience - a great selling point for many DNS services. In this thesis we look at the performance of DNS services and servers through the scope of 51 unique free, public and popular DNS servers. We use a specifically designed tool, DNSHoarder, to collect 714,000 datapoints of 250 different hostnames of varying popularity over seven days. From this data we find most DNS servers to exhibit a similar relative distribution of response times and performance differences between IPv4 and IPv6 to be minor or nonexistent. We also find network distance and quality to have a big effect on the performance of DNS as well as network latency to be a major limiting factor in further DNS performance improvements.

  • 36.
    Palm Myllylä, Johannes
    Linköping University, Department of Computer and Information Science.
    Domain Adaptation for Hypernym Discovery via Automatic Collection of Domain-Specific Training Data2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Identifying semantic relations in natural language text is an important component of many knowledge extraction systems. This thesis studies the task of hypernym discovery, i.e discovering terms that are related by the hypernymy (is-a) relation. Specifically, this thesis explores how state-of-the-art methods for hypernym discovery perform when applied in specific language domains. In recent times, state-of-the-art methods for hypernym discovery are mostly made up by supervised machine learning models that leverage distributional word representations such as word embeddings. These models require labeled training data in the form of term pairs that are known to be related by hypernymy. Such labeled training data is often not available when working with a specific language domain. This thesis presents experiments with an automatic training data collection algorithm. The algorithm leverages a pre-defined domain-specific vocabulary, and the lexical resource WordNet, to extract training pairs automatically. This thesis contributes by presenting experimental results when attempting to leverage such automatically collected domain-specific training data for the purpose of domain adaptation. Experiments are conducted in two different domains: One domain where there is a large amount of text data, and another domain where there is a much smaller amount of text data. Results show that the automatically collected training data has a positive impact on performance in both domains. The performance boost is most significant in the domain with a large amount of text data, with mean average precision increasing by up to 8 points.

  • 37.
    Lund, Max
    Linköping University, Department of Computer and Information Science.
    Duplicate Detection and Text Classification on Simplified Technical English2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigates the most effective way of performing classification of text labels and clustering of duplicate texts in technical documentation written in Simplified Technical English. Pre-trained language models from transformers (BERT) were tested against traditional methods such as tf-idf with cosine similarity (kNN) and SVMs on the classification task. For detecting duplicate texts, vector representations from pre-trained transformer and LSTM models were tested against tf-idf using the density-based clustering algorithms DBSCAN and HDBSCAN. The results show that traditional methods are comparable to pre-trained models for classification, and that using tf-idf vectors with a low distance threshold in DBSCAN is preferable for duplicate detection.

  • 38.
    Näsman, David
    Linköping University, Department of Computer and Information Science.
    Emergency Vehicle Approaching: En inledande designstudie för utformning och utvärdering av användargränssnitt i en körsimulator för E.V.A-meddelande i mottagande civila fordon2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    I takt med att trafiksituationen blir allt mer komplex och krävande, ställs högre krav på dagens bilförare. I kombination med att ny informationsteknik inkorporeras inuti fordonen, uppstår även ett ökat informationsflöde som ständigt måste bearbetas av föraren både inuti och utanför fordonet. Eftersom förares visuella uppmärksamhet är begränsad, kan denna ökning innebära att förares kapacitet att uppmärksamma objekt i sin omgivning inte räcker till. Ett vanligt förekommande problem är idag att utryckningsfordon misslyckas påkalla uppmärksamheten hos den omkringliggande trafiken eller att trafiksituationer är så komplexa att den civila trafikanten inte har möjlighet att flytta sig ur vägen.

    Denna studie ämnade utforma två designförslag för att undersöka vilka tänkbara effekter som ett förvarnande varningssystem skulle ha på den civila föraren i utryckningssituationer. För utformningen av gränssnitten genomfördes en designprocedur som grundar sig i tidigare studier samt personor. För att undersöka och utvärdera de utformade gränssnittens effekt, genomfördes användartester i en bilsimulator hos uppdragsgivaren VTI.

    Inga statistiskt signifikanta skillnader kunde identifierades mellan de utformade gränssnitten. Däremot kunde en medelstark effektstorlek (cohen ́s d = -0.4029) identifieras för frågan ”Hur snabbt uppfattades informationen som presenterades?”. Effektstorleken indikerar att information som enbart presenterades i bilens instrumentbräda, var effektivare i termer av att snabbt kunna uppmärksamma information jämfört med när informationen även presenterades i mittkonsolens display. Resultaten indikerar även att den subjektiva inställning gentemot de båda gränssnitten var positiv. Framförallt för att varningssystemets förvarnande funktionalitet gav förarna mer tid och möjlighet att uppmärksamma utryckningsfordonet samt förbereda sig på situationen.

  • 39.
    Lind, Martin
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Arts and Sciences.
    En kvalitativ explorativ studie för framtagande av lämplig funktionalitet hos internettjänster för behandling av social ångest2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    En tanke som ligger till grund för denna studie är de svårigheter som en person med social ångest kan ha inför att söka hjälp hos en kurator eller terapeut, detta då hjälpsökandet i sig kan innebära en stor social utmaning. Ett potentiellt sätt att närma sig en lösning till detta är användandet av olika former av digitala hjälpmedel, som kan tillgås av vem som helst som har tillgång till mobil eller dator, som kan agera som ett underlättande steg till att exempelvis bättre förstå sina problem och söka och hitta hjälp via internet. Denna kvalitativa studie ämnar utforska behov, erfarenheter och åsikter kring behandling av social ångest i koppling till internetanvändning utifrån perspektivet hos dem som upplever social ångest, genom tematisk analys av enkätsvar. Således uppfylls syftet bakom studien som är att lägga en grund för hur internettjänster kan utformas på lämpligt sätt för att möjliggöra och underlätta behandling för personer med social ångest/fobi. Det studien ämnar besvara är; vilka tjänster och funktioner på internet för behandling av social ångest är behövda och efterfrågade och vilka problem och frågeställningar behöver i sin tur lösas och besvaras för att dessa tjänster och funktioner ska göras tillgängliga? Den slutliga tematiska analysen visar sammanfattningsvis att det bland personer med sociala svårigheter kan finnas ett behov och efterfrågan gällande möjligheter till förbättrad digital vårdkontakt, att man som person med sociala svårigheter överlag har en positiv inställning till olika former av chatt och samtal i behandlings- och stödsyfte via internet och att olika former av individanpassningar av internetförmedlade behandlingar efter en individs unika behov och mål kan vara ett lämpligt sätt att hitta rätt behandling. Vidare uppstår nya spår för framtida forskning och utredningar som kan vara intressanta utifrån studiens resultat; att pröva olika varianter och mäta effekt av individanpassad vård förmedlad via internet, utreda hur man kan skapa förbättrad (säker) digital vårdkontakt samt utreda hur innovativa effektiva behandlingslösningar bättre kan nå ut till den som efterfrågar den.

  • 40.
    Börjesson, Hanna
    et al.
    Linköping University, Department of Computer and Information Science.
    Fredholm, Mathias
    Linköping University, Department of Computer and Information Science.
    Friberg, Axel
    Linköping University, Department of Computer and Information Science.
    Hallström, Julia
    Linköping University, Department of Computer and Information Science.
    Holmberg, Axel
    Linköping University, Department of Computer and Information Science.
    Kjellgren, Anna
    Linköping University, Department of Computer and Information Science.
    Lindsten, Jesper
    Linköping University, Department of Computer and Information Science.
    Persson, Samuel
    Linköping University, Department of Computer and Information Science.
    En undersökning av lyx på en e-handelsbutik för försäljning av second hand-kläder2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Det senaste årtiondet har e-handeln i Sverige och världen ökat drastiskt. Samtidigt förändras miljön kring oss och likaså medvetenheten om miljön samt viljan att göra något åt förändringarna. Att köpa second hand-kläder är ett sätt att minska utsläppen från ens klädkonsumtion, men problemet med second hand-kläder är att de inte upplevs så attraktiva. Detta ledde fram till frågeställningen för rapporten, “Hur kan en e-butik för second hand-kläder utformas för att uppnå en upplevdlyx hos användaren enligt BLI (Brand Luxury Index)?”. För att undersöka hur en upplevelse av lyx på e-butik kunde uppnås genomfördes användartester och fallstudier. Resultatet av detta visade att en lyxig hemsida ska ha en enhetlig design, snygga bilder och ett bra helhetsintryck vilket sedan implementeras på en e-butik. Slutsatsen som drogs från detta var att vad som krävs är en kombination av funktionalitet och design. Funktionalitet är dock endast relevant till en viss grad, då det efter det är viktigare med designen på hemsidan.

  • 41.
    Graf Morin, Harald
    et al.
    Linköping University, Department of Computer and Information Science.
    Moberg, Adam
    Linköping University, Department of Computer and Information Science.
    Jonsson, Elina
    Linköping University, Department of Computer and Information Science.
    Hedén, Felix
    Linköping University, Department of Computer and Information Science.
    Elsässer, Nathalie
    Linköping University, Department of Computer and Information Science.
    Wester, Oscar
    Linköping University, Department of Computer and Information Science.
    Nilsson, Sara
    Linköping University, Department of Computer and Information Science.
    Henriksson, Simon
    Linköping University, Department of Computer and Information Science.
    Lennmark, Teodor
    Linköping University, Department of Computer and Information Science.
    En undersökning av lyxighet gällande design på en webbapplikation2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The luxury segment has been late in its technology adaptation even though e-commerce, and the importance of internet presence, has increased. To succeed the conversion, traders need to know how to keep the customers perception of luxury on a webpage. This report aims to investigate how an e-shop should be designed to be perceived luxurious in terms of design. The question “How should an e-shop be designed to perceived as luxury according to its design?” is answered by developing and designing a web application for self-composed jam giving a luxurious perception. The method used is based on a study investigating homepage design. Several design factors that has a positive effect of customers perception of luxury were identified, whereupon a web application was developed. The web application and conventional one as reference, was individually evaluated on the BLI-scale together and with a Thinking Aloud test. The result showed a significant difference of the average for all dimensions of the BLI scale, where the hypothetically luxurious web application achieved the higher result. The Thinking Aloud test showed that the test page got more comments that pointed to a more luxurious experience, compared to the conventional page. The report concludes that esthetics and an overall impression of uniqueness and quality are important dimensions for the web application to be perceived as luxurious.

  • 42.
    Moberg, Adam
    et al.
    Linköping University, Department of Computer and Information Science.
    Jonsson, Elina
    Linköping University, Department of Computer and Information Science.
    Hedén, Felix
    Linköping University, Department of Computer and Information Science.
    Graf Morin, Harald
    Linköping University, Department of Computer and Information Science.
    Wester, Oscar
    Linköping University, Department of Computer and Information Science.
    Elsässer, Nathalie
    Linköping University, Department of Computer and Information Science.
    Nilsson, Sara
    Linköping University, Department of Computer and Information Science.
    Henriksson Välimaa, Simon
    Linköping University, Department of Computer and Information Science.
    Lennmark, Teodor
    Linköping University, Department of Computer and Information Science.
    En undersökning av lyxighet gällande design på en webbapplikation2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The luxury segment has been late in its technology adaptation even though e-commerce, and the importance of internet presence, has increased. To succeed the conversion, traders need to know how to keep the customers perception of luxury on a webpage. This report aims to investigate how an e-shop should be designed to be perceived luxurious in terms of design. The question “How should an e-shop be designed to perceived as luxury according to its design?” is answered by developing and designing a web application for self-composed jam giving a luxurious perception. The method used is based on a study investigating homepage design. Several design factors that has a positive effect of customers perception of luxury were identified, whereupon a web application was developed. The web application and conventional one as reference, was individually evaluated on the BLI-scale together and with a Thinking Aloud test. The result showed a significant difference of the average for all dimensions of the BLI scale, where the hypothetically luxurious web application achieved the higher result. The Thinking Aloud test showed that the test page got more comments that pointed to a more luxurious experience, compared to the conventional page. The report concludes that esthetics and an overall impression of uniqueness and quality are important dimensions for the web application to be perceived as luxurious.

  • 43.
    Brandt, Daniel
    et al.
    Linköping University, Department of Computer and Information Science.
    Fasth, Frida
    Linköping University, Department of Computer and Information Science.
    Gustavsson, Adam
    Linköping University, Department of Computer and Information Science.
    Janfalk, Elsa
    Linköping University, Department of Computer and Information Science.
    Kimiaei, Felix
    Linköping University, Department of Computer and Information Science.
    Lindholm, Victor
    Linköping University, Department of Computer and Information Science.
    Palmlund, Victor
    Linköping University, Department of Computer and Information Science.
    Swensson, Styrbjörn
    Linköping University, Department of Computer and Information Science.
    En undersökning av on-site-faktorers påverkan på en e-handelsplattform2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    As a result of trends identified in the report and marketing plan, the importance of a search engine optimized platform for e-commerce is established. In order to further examine the implementation of such, a website was constructed with this purpose in mind. The of said website was designed based on user stories which in their turn partly came from competitor's websites and partly from preference. In order to optimize the website for search engines, four established factors were optimized to the best of the group's ability. These factors were responsivity, custom 404-page, sitemap and keywords. Testing these factors against Google, the tests were ran partly through the search engine itself and partly through the third-party programmes WebSite Auditor and SERPROBOT. In accordance with expectations, the keywords had a considerable effect on the acquired results, but the remaining factors had nothing more than a marginal contribution; this was not expected. The experiment had many sources of error and and low reliability, cheifly on account of the chosen instruments for measure and a statistical uncertainty as a result of few observations. The conclusion made is that keywords have a greater effect than the other evaluated factors.

  • 44.
    Persson Proos, Daniel
    Linköping University, Department of Computer and Information Science.
    Enabling Digital Twins: A comparative study on messaging protocols and serialization formats for Digital Twins in IoV2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this thesis, the trade-offs between latency and transmitted data volume in vehicle-to-cloud communication for different choices of application layer messaging protocols and binary serialization formats are studied. This is done with the purpose of getting enough performance improvement to enable delay-sensitive Intelligent Transport System (ITS) features, and to reduce data usage in mobile networks. The studied protocols are Constrained Application Protocol (CoAP), Advanced Message Queuing Protocol (AMQP) and Message Queuing Telemetry Transport (MQTT), and the serialization formats studied are Protobuf and Flatbuffers.  The results show that CoAP — the only User Datagram Protocol (UDP) based protocol — has the lowest latency and overhead while not being able to guarantee reliable transfer. The best performer that can guarantee reliable transfer is MQTT. For the serialization formats, Protobuf is shown to have three times smaller serialized message size than Flatbuffers and also faster serialization speed. Flatbuffers is the winner in the case of memory use and deserialization time, which could make up for the poor performance in other aspects of data processing in the cloud. Further, the implications of these results in ITS communication are discussed suggestions made into future research topics.

  • 45.
    Pettersson, Albin
    Linköping University, Department of Computer and Information Science.
    Engelska som kommandospråk inom marina operationer i den svenska Försvarsmakten2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The report covers a study of the usage of English with NATO-standard within the Swedish Military’s Marine Force and Navy. Employees within different organizations have been interviewed regarding the parallell usage of the english language combined with their every-day working tasks and how the language is affecting their ability to keep on operating at a desirable level. All the interviewees have noticed a wide range of problems regarding how the language should be used according to their directives, that the problems are mainly concerning how the language is affecting their levels of stress when it creates communication problems, interpretation difficulties and makes ordinary tasks require more time to finish, even though their personal tasks might not always be affected directly. Carrier possibilities are also affected negatively, when language proficiency is prioritized over working experience and general competence, which over time could lead to a less experienced organization. A number of suggestions is given regarding how the language should be viewed upon in near the future.

  • 46.
    Rönnqvist, Lisa
    Linköping University, Department of Computer and Information Science.
    Etnisk mångfald i illustrationer: En kvalitativ undersökning om etnisk mångfald i illustrationer och hur illustratörer tänker när de skapar illustrationer2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Illustrationer i böcker ämnade för barn, både läroböcker och skönlitteratur, innehöll färre karaktärer med mörk hudfärg än ljus hudfärg och karaktärerna med mörk hudfärg hade sällan huvudroller i böckerna. Den här studien ämnade därför att undersöka hur illustratörer går tillväga för att skapa illustrationer av karaktärer med fokus på etnisk mångfald, hur man kan illustrera en variation bland karaktärerna utan att illustrera stereotypiskt och varför det är viktigt att illustrationer innehåller karaktärer med olika etniciteter. För att uppfylla studiens syfte intervjuade fem illustratörer och sedan analyserades materialet med tematisk analys. Resultatet visade att det är viktigt att illustrationer innehåller karaktärer med olika etniciteter eftersom det kan visa barn att människor ser olika ut. Det är även viktigt att vara medveten om normer och stereotyper när man illustrerar för att skapa illustrationer som bidrar till den stereotypiska bilden och genom att vara medveten kan man välja att illustrera på sätt som skiljer sig från det stereotypiska. Resultatet visade även att det kan vara både illustratören och uppdragsgivaren som bestämmer hur karaktärerna i en illustration ska se ut.

  • 47.
    Wängelin, Malin
    Linköping University, Department of Computer and Information Science.
    Ett nytt Friendlyreader: implementationen av ett gränssnitt med fokus på språkteknologiska funktioner2019Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta arbete var att implementera ett fungerande verktyg för att underlätta läsning av text med fokus riktat mot språkteknologiska funktioner. Det digitala verktyget Friendlyreader är framtaget för att underlätta läsning av text för individer med lässvårigheter, som exempelvis kan bero på dyslexi eller en funktionsnedsättning. Detta arbete har genom en förstudie kartlagt vilken funktionalitet som efterfrågas och finns tillgänglig hos liknande verktyg som ämnar att underlätta läsning. Detta har legat till grund för implementationen av ett funktionellt gränssnitt som bygger på språkteknologiska funktioner som tillhandahålls från en fjärrservern genom SAPIS REST API. Under implementationen togs beslutet att göra funktionaliteten samverkande för att skapa ett mer flexibelt verktyg. Detta innebär att text som exempelvis blivit förenklad även kan bli sammanfattad, funktionaliteten utgår således från textens aktuella utformning och inte dess original. Implementationen genomgick tester där all funktionalitet med fokus på språkteknologi fick ett godkänt resultat.

  • 48.
    Amanda, Jaber
    Linköping University, Department of Computer and Information Science.
    Evaluating the Team Resilience Assessment Method for Simulation (TRAMS)2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Team Resilience Assessment Method for Simulation (TRAMS) is an instrument that consist of several measurements, such as team-member exchange, workload, the TRAMS observation protocol etc. This thesis researches the observation protocol. The TRAMS protocol is an assessment method for resilience in simulation games. The aim of this protocol is to support the identification of resilience strategies used and developed by the participants in a simulation game. It is a challenge to assess resilience in teams and that is why the TRAMS protocol has been developed. The scenario of the simulation games is a disruption for 10 days in the card payment system. During the simulation games, the participants work in teams and have to try to cope with the disruption in the card payment system. During the course of this study, 14 simulation games have been conducted with seven different teams. Each of the simulation games has been executed during one whole day, and the participating teams have in total played two games each. During every simulation game there were three observers equipped with the TRAMS protocol. To interpret the data collected with the TRAMS protocol, two methods have been used: transcription and thematic analysis. As a result, guidelines and design changes was formed. In addition, results showed that the distribution and frequency of observations of resilience strategies made were similar, that the observations noted by the observers were similar, and lastly eight themes from the data collection could be extracted: Coordinate and collaborate, Payment options, Cash circulation, Safety, Fuel and transportation, Inform, communicate and the media, Hoarding and rationing, Vulnerable groups. In conclusion, the TRAMS protocol is still under development and 15 more simulation games are planned to be conducted within the ongoing CCRAAAFFTING project. However, the protocol has been applied in this study´s 14 simulation games so far, and the similarities in how the observers filled in the protocol and how similar the observations were, indicate that it hopefully can develop into a recognized research tool in the future. 

  • 49.
    Hyllienmark, Erik
    Linköping University, Department of Computer and Information Science.
    Evaluation of two vulnerability scanners accuracy and consistency in a cyber range2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One challenge when conducting exercises in a cyber range is to know what applications and vulnerabilities are present on deployed computers. In this paper, the reliability of application-and vulnerability reporting by two vulnerability scanners, OpenVas and Nexpose, have been evaluated based on their accuracy and consistency. Followed by an experiment, the configurations on two virtual computers were varied in order to identify where each scanner gathers information. Accuracy was evaluated with the f1-score, which combines the precision and recall metric into a single number. Precision and recall values were calculated by comparing installed ap-plications and vulnerabilities on virtual computers with the scanning reports. Consistency was evaluated by quantifying how similar the reporting of applications and vulnerabilities between multiple vulnerability scans were into a number between 0 and 1. The vulnerabilities reported by both scanners were also combined with their union and intersection to increase the accuracy. The evaluation reveal that neither Nexpose or OpenVas accurately and consistently report installed applications and vulnerabilities. Nexpose reported vulnerabilities better than OpenVas with an accuracy of 0.78. Nexpose also reported applications more accurately with an accuracy of 0.96. None of the scanners reported both applications and vulnerabilities consistently over three vulnerability scans. By taking the union of the reported vulnerabilities by both scanners, the accuracy increased by 8 percent compared with the accuracy of Nexpose alone. However, our conclusion is that the scanners’ reporting does not perform well enough to be used for a reliable inventory of applications and vulnerabilities in a cyber range.

  • 50.
    Friberg, Marc
    Linköping University, Department of Computer and Information Science.
    Examining the Effects of Stress on Tourniquet Application in a Layperson and Professional Civilian Population2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Every year, approximately 3000 people die as the result of physical trauma in Sweden (Gedeborg, Chen, Thiblin, & Byberg, 2012). Many of these deaths occurs outside of the hospital and are preventable, including some caused by hemorrhage. One hemorrhage control device is the tourniquet which can be used in a civilian pre-hospital setting. The effects of stress on a laypersons tourniquet application ability is unknown and to date only one study have examined the effects of stress on tourniquet application in a military population (Schreckengaust, Littlejohn, & Zarow, 2014). The purpose of this study was to investigate how the performance of two first aid interventions, tourniquet application and cardiopulmonary resuscitation (CPR), is affected by stress in immediate (layperson) and first (professional) responders. A total of 55 participants followed a brief educational program about hemorrhage control. Their ability to apply a tourniquet and perform CPR was tested in a calm classroom scenario and a stressful scenario, which consisted of paintball fire and an obstacle course. Stress was assessed through subjective reports of stress, physiological heart rate and heart rate variability measurements, and subjective workload and with a secondary task. The results showed differences of elicited stress reaction between the conditions and groups. Tourniquet and CPR performance was moderately affected by stress. Participants across all groups experienced more stress reactions during the stressful scenario, and laypersons did experience more stress reactions than professional first responders. In conclusion, the method did make participants experience more stress reactions in terms of psychological, physiological and performance adaptations in the stressful scenario. However, the results need to be replicated and a list of suggested improvements are given, such as: examining the fidelity of the scenarios, validating the tourniquet application assessment method, and examining the relationship between tourniquet application performance and self-assessed performance.

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