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  • 1.
    Barsomo, Milad
    Linköping University, Department of Computer and Information Science.
    A Survey of Automated Tools for Probing Vulnerable Web Applications2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The development of web applications have increased exceedingly in the last few years. Without the concern of security development, these web applications are exposed to a great amount of cyber threats. This thesis provides a survey of automated tools, or so called black box web scanners, that are used to find vulnerabilities, without any internal knowledge, in a web application. The web scanners was evaluated by running them on an vulnerable web application called XVWA and comparing the scanning results with two criteria. First criterion is to see if it is as accurate as stated, and the second criterion is to check if they pass the requirements of NIST for a web scanner of this type. All of the web scanners included in this thesis are open source/free to use. The results of eight different web scanners shows that most of the scanners does not follow the NIST requirements fully, however the majority still performs well. It has also been seen that the newer and most active developed scanners performs the best which is logical. One of the drawn conclusions is that none works perfect or is above all the other scanners.

  • 2.
    Cesarini, Kristian
    Linköping University, Department of Computer and Information Science.
    Designing and Evaluating Serious Games for Cost- Effective Data Acquisition in Genomics Research2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Scientists interested in uncovering associations between DNA variants and complex traits such as personality characteristics and cognitive abilities often face the constraint that the research requires very large samples to be successful. One reason very large samples are difficult to assemble is that the outcome variables are not always measured in a consistent way in different data sets, and sometimes they are not measured at all. In such cases, traditional measurement techniques (such as in-house interviews or surveys) are not always feasible. In this project, I sought to develop two “serious games” which can be used to measure short-term memory. The study shows that an individual’s performance in both of these games is moderately predictive of measures of short-term memory used by psychologists. The study also finds that users rate the serious games as more enjoyable than the conventional measures. The results suggest that ongoing effort to gather outcome data via nonstandard techniques such Mobile apps may turn out to be a useful complement to conventional approaches toward data collection.

  • 3.
    Hedelin, Hugo
    Linköping University, Department of Computer and Information Science.
    Design and evaluation of a user interface for a WebVR TV platform developed with A-Frame2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The market for virtual reality products has grown rapidly the last few years, and as the demand grows, the supply should naturally follow. More games, applications and also web sites for virtual reality are going to have to be designed and produced to support this demand. However, the guidelines and the literature for designing user interfaces specifically for virtual reality are few and often outdated. The purpose of this thesis is to help contribute to determine how to design user interfaces for virtual reality, when one is making selection with fuse-based clicks. In this thesis, a prototype for a TV-platform is designed and produced in WebVR, using the framework A-Frame. The prototype is then evaluated with usability tests and redesigned as according to an iterative design process. The evaluations showed that items were easily clicked by mistake and often unknowingly. Furthermore, the test user participants often failed to notice user interface objects if the objects were not placed in the centre areas of the user interface. The conclusion suggests that navigation paths within the user interface could mitigate accidental clicks, and auditory feedback could help users notice the accidental clicks. Moreover, between 700ms to 1000ms, but closer to 1000ms, could be an appropriate fuse time to facilitate ease of making selections at the cost of speed efficiency.

  • 4.
    Jansson, Björn
    et al.
    Linköping University, Department of Computer and Information Science.
    Maghsoudi, Sebastian
    Linköping University, Department of Computer and Information Science.
    Developing SharePoint add-ins2017Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Developing a Microsoft SharePoint-based site is, according to marketing, simple and efficient. Efficiency is increased by giving the developer the option to easily add functionality to the site. One way to add functionality is through so called add-ins. An add-in extends the functionality of the site by running independent code on the client, cloud or a server outside the SharePoint farm. Add-ins can be added to the site through a web-based market or by creating new ones. The general question is if creation of new add-ins is worth the effort. This discussion can begin by investigating what implementation detail is reoccurring when developing this add-ins as well as what part of the process the most time is consuming. By attempting to create add-ins and the same time documenting the progress one can make conclusion regarding said questions. The result shows that the most recurring parts of development is how to manage the incoming data. It also seems as if the most time consuming part of add-in development is the research and construction of functionality that fetch data from the SharePoint-based site. Another part of the result is technical and contains information necessary to understand how the example add-ins are created. The add- ins that is presented in this paper concern document management which is a significant aspect of Microsoft SharePoint. 

  • 5.
    Öhlund, Elinor
    et al.
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Wang, William
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Phung, Gullis
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Olsson, Jonas
    Lundqvist, Felix
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Hultberg, Dag
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Fixcher, Max
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Back, Hampus
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering.
    Design och implementation av en e-butik med en personifierbar produkt för att uppnå nytta och effektivitet: Utveckling av e-butiken Coffe Creation2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to find factors that enhances the usability of an e-commerce with customizable products in terms of usefulness and effectiveness/efficiency. The process which has been used to reach the end product is an iteration-based user-centered design method in which the developers have had a continuous dialogue with the end users. The design choices that have been made are based on user test feedback. Five factors of importance to achieve usefulness and effectiveness/efficiency for an e-commerce website that sell customizable products have emerged from the study.  It has been shown that both usefulness and effectiveness/efficiency are affected by the presented functionality and purpose of the application. The users understanding of how a certain choice will affect a customizable product is connected with usefulness. The applications capability to inform the user of the information found on the e-shop need to have a proper structure to achieve effectiveness/efficiency. The last factor is related to the buying process, it is shown that the usefulness can be improved if there is a possibility to select products without the need to create a custom product from scratch.

  • 6.
    Andersson, Rikard
    et al.
    Linköping University, Department of Computer and Information Science.
    Emberg, Johan
    Linköping University, Department of Computer and Information Science.
    Hazell, Sofie
    Linköping University, Department of Computer and Information Science.
    Laestander, Hjalmar
    Linköping University, Department of Computer and Information Science.
    Norberg, Gustaf
    Linköping University, Department of Computer and Information Science.
    Elmfeldt Rönnmark, Maximilian
    Linköping University, Department of Computer and Information Science.
    Buciuto Sundelin, Bruno
    Linköping University, Department of Computer and Information Science.
    Törngren, Erik
    Linköping University, Department of Computer and Information Science.
    Heat n' Eat: Utvecklingen av en användbar e-butik med fokus på navigerbarhet2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Students today lack both time and money. At the same time e-commerce is increasing, and especially food sales over the internet. This report aims to explore the possibilities of a service that offers students a simple alternative for high quality food within their budget in the form of a web application. Students at Campus Valla expressed the need for such a service through a market research. The study was conducted by researching theories regarding usability and navigability. Students as a group often lack time and are used to getting fast and clear information; this is ensured by good navigability. After the researching of theories, several user tests were conducted on the targeted group. The result following this was the development of the web application Heat n' Eat. In order to achieve good navigability, the application was implemented with a simple layout, focusing on the products. A final user test showed that the application could be considered usable with focus on navigability.

  • 7.
    Broberg, Carolina
    et al.
    Linköping University, Department of Computer and Information Science.
    Ek, Oscar
    Linköping University, Department of Computer and Information Science.
    Gålén, Linus
    Linköping University, Department of Computer and Information Science.
    Krats, Anders
    Linköping University, Department of Computer and Information Science.
    Nikitidis, Andreas
    Linköping University, Department of Computer and Information Science.
    Rundberg, Fredrik
    Linköping University, Department of Computer and Information Science.
    Sanne, Jakob
    Linköping University, Department of Computer and Information Science.
    Trouvé, Johanna
    Linköping University, Department of Computer and Information Science.
    ChiliChallenge: Utveckling av en användbar webbapplikation2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This report examines how a web application in e-commerce is created with a focuson good usability. The usability areas studied are navigability, reliability and how an effective purchasing process is designed. Based on established theory of usability, a webapplication that sells chili peppers has been created. User tests have been used as an evaluation method to review if usefulness has been achieved. During the project, three qualitative tests have been made and based on the results of these, along with established theory, functionality and design have been changed to improve usability. The conclusion indicates that it is possible to create an application that is considered useful in terms of the three main areas.

  • 8.
    Alexandersson, Henrik
    et al.
    Linköping University, Department of Computer and Information Science.
    Bouganim, Jakob
    Linköping University, Department of Computer and Information Science.
    Do Ruibin, Kevin
    Linköping University, Department of Computer and Information Science.
    Gunnarsson, Daniel
    Linköping University, Department of Computer and Information Science.
    Hyllienmark, Erik
    Linköping University, Department of Computer and Information Science.
    Karlsson, Anton
    Linköping University, Department of Computer and Information Science.
    Nathanaelsson, Sara
    Linköping University, Department of Computer and Information Science.
    Ringqvist, Hugo
    Linköping University, Department of Computer and Information Science.
    En studie kring utvecklingen av webbapplikationen HappyBox2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The purpose of the report was to examine how an online store selling dinner kits could be designed and implemented to be usable in reference to navigability while inducing trust and encouraging customer engagement. A pre-study was used to determine the interest for the product among the target audience. Thenceforth a prototype was developed and the design of the web application was formed. An iterative process was used during the development of the application and through usability testing the elements of the scientific question was evaluated. The report presents and discusses the design of the web application and how it has been used to fulfill the purpose of the report. Technical solutions regarding the modeling of the web application are discussed and motivated. Finally, it is argued that feedback and distinct buttons make the application trustworthy and easy to navigate over. Conclusions about customer engagement were difficult to make.

  • 9.
    Erkén, Amanda
    et al.
    Linköping University, Department of Computer and Information Science.
    Cederblad, Cecilia
    Linköping University, Department of Computer and Information Science.
    Saller, Christophe
    Linköping University, Department of Computer and Information Science.
    Wahlström, Daniel
    Linköping University, Department of Computer and Information Science.
    Odlinder Haubo, Erik
    Linköping University, Department of Computer and Information Science.
    Lewenhaupt, Hugo
    Linköping University, Department of Computer and Information Science.
    Hellström, Jesper
    Linköping University, Department of Computer and Information Science.
    Wallin, Johan
    Linköping University, Department of Computer and Information Science.
    Andreasson, Oscar
    Linköping University, Department of Computer and Information Science.
    The Design and Implementation of a Subscription-Based E-shop That Is Easily Navigated and Visually Appealing to Its Users2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The report presents a study of the design and implementation of a web application with the purpose of being easy to navigate and understand as well as inducing a positive attitude in its users. A pilot study and marketing plan acted as the foundation for the implementation of the application. The evaluation consisted of a Thinking aloud usability test as well as a user attitude  test. An analysis of the results indicated a web application which fulfilled the demands that the research group affirmed and it was ultimately concluded that factors such as visual feedback, clarity in the purchasing process and fixed navbar were essential to achieve the aforementioned purpose. Lastly, it was also summarized that the research done was not extensive enough to be able to draw general conclusions regarding inducing positive attitudes.

  • 10.
    Berntzon, Fredrik
    et al.
    Linköping University, Department of Computer and Information Science.
    Dahlström, Didrik
    Linköping University, Department of Computer and Information Science.
    Fries, Niklas
    Linköping University, Department of Computer and Information Science.
    Håstad, Oskar
    Linköping University, Department of Computer and Information Science.
    Markgren, Hedvig
    Linköping University, Department of Computer and Information Science.
    Persson, Gustaf
    Linköping University, Department of Computer and Information Science.
    Strandberg, Axel
    Linköping University, Department of Computer and Information Science.
    Söderlind, Marcus
    Linköping University, Department of Computer and Information Science.
    Implementering av en användbar och förtroendeingivande C2C-plattform för matlådor: En fallstudie av webbapplikationen Delish2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This report covers a case study performed at Linköping University. The project consists of the development of a web application of type e-commerce, named Delish, which is a service for trading lunch boxes among students. The report treats the compilation of a theoretical framework, the development and its results followed by a discussion. The web application serves as a foundation in order to examine how an application should be designed to ensure high navigability and simplicity while establishing user trust. Information is gathered in order to define a theoretical and methodical framework. The development is accompanied by an evaluation of the products fulfilment of earlier set goals, by conducting market surveys and usability testing. Navigability is achieved through the implementation of different navigational systems and the application is perceived as simple as a result of effective use of colours and typography. Through the implementation of a ranking system and communication of data integrity, the application is perceived as trustworthy.

  • 11.
    Albertsson, Marcus
    et al.
    Linköping University, Department of Computer and Information Science.
    Öberg Bustad, Adrian
    Linköping University, Department of Computer and Information Science.
    Sundmark, Mattias
    Linköping University, Department of Computer and Information Science.
    Gerde, Elof
    Linköping University, Department of Computer and Information Science.
    Boberg, Jessika
    Linköping University, Department of Computer and Information Science.
    Abdulla, Ariyan
    Linköping University, Department of Computer and Information Science.
    Danielsson, Oscar
    Linköping University, Department of Computer and Information Science.
    Johnsson Bittmann, Felicia
    Linköping University, Department of Computer and Information Science.
    Moberg, Anton
    Linköping University, Department of Computer and Information Science.
    Hur en webbapplikation kan utvecklas för att leverera säkerhet, handlingsbarhet och navigerbarhet: PimpaOvven – Utveckling av en e-butik för märken och accessoarer till studentoveraller2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Among students in many of Sweden’s Universities the student overall is an established possession. Many students like to decorate their overalls with embroidered patches and other types of accessories, the supply of these is however limited. This report presents the development process and result of the web application “PimpaOvven” – an e-shop with the purpose of increasing the accessibility of patches and overall accessories. The development has been iterative and focused on building a secure web application that generates a useable environment regarding actability and navigability that also provides an impression of security to the user. The methods used which generated the resulting web application together with the reference framework form the basis of the report’s discussion. During the project plenty of usability tests and security tests were conducted, from these tests together with the report’s discussion the conclusion was drawn that the produced web application was secure and useable.

  • 12.
    Andersson, Titus
    et al.
    Linköping University, Department of Computer and Information Science.
    Byström, Markus
    Linköping University, Department of Computer and Information Science.
    Engstam, Karl
    Linköping University, Department of Computer and Information Science.
    Hedlund, Carl
    Linköping University, Department of Computer and Information Science.
    Larsson, Gustav
    Linköping University, Department of Computer and Information Science.
    Nordborg, Oskar
    Linköping University, Department of Computer and Information Science.
    Saeby, Christian
    Linköping University, Department of Computer and Information Science.
    Wahlstedt, Joel
    Linköping University, Department of Computer and Information Science.
    Utvecklingen av webbapplikationen Coffify med fokus på användbarhet2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    E-commerce have gotten more common the past years, and it is of great importance that sellers can offer a useable platform on the internet. During the startup-process of this project, multiple coffee roasters were contacted and they were positive to the idea of a webshop application that can help them reach more customers. During the development of the application, the main focus was usability, which is thought to be achieved by navigability, clarity and simplicity. The process started with a product backlog and a prototype which made the base for the development. Evaluation of the web application was made through user testing and acceptance testing. The work resulted in a web application that, according to user tests, proved to be passable in usability through the listed aspects. However, in the end, the question formulation could not be fully answered, since exactly which specific elements and factors that added navigability, clarity and simplicity to the web application could not be identified.

  • 13.
    Axelsson, Jonathan
    et al.
    Linköping University, Department of Computer and Information Science.
    Cheng, Viktor
    Linköping University, Department of Computer and Information Science.
    Felippe da Silva Galeano, Renata
    Linköping University, Department of Computer and Information Science.
    Hermansson, Eric
    Linköping University, Department of Computer and Information Science.
    Lindholm, David
    Linköping University, Department of Computer and Information Science.
    Olefalk, Simon
    Linköping University, Department of Computer and Information Science.
    Shadman, Cecilia
    Linköping University, Department of Computer and Information Science.
    Easyfleet – A Customised Fleet Management: A case study in developing a web application that supports navigation, simplicity and customer satisfaction2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    When vehicles are an important part of companies as part of their business operations, it arises a need for obtaining an overview of their vehicle fleet. Storing this information using old-fashioned means such as spreadsheets or whiteboards is time-consuming, inefficient and not accessible at all time.

    In this day and age, a web application could not only fulfill existing needs but also provide new and valuable functionality. The main advantage of storing information about a vehicle fleet in a web application would be to provide easy access to information for everyone in the organisation at all time. 

  • 14.
    Jonsén, Fredrik
    et al.
    Linköping University, Department of Computer and Information Science.
    Stolpe, Alexander
    Linköping University, Department of Computer and Information Science.
    The feasibility and practicality of a generic social media library2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
  • 15.
    Biamont, Markus
    et al.
    Linköping University, Department of Computer and Information Science.
    Danielsson, Alexander
    Linköping University, Department of Computer and Information Science.
    Frölander, Anton
    Linköping University, Department of Computer and Information Science.
    Johansson, Gustav
    Linköping University, Department of Computer and Information Science.
    Melbi, Philip
    Linköping University, Department of Computer and Information Science.
    Eric, Petersson
    Linköping University, Department of Computer and Information Science.
    Strandberg, Joakim
    Linköping University, Department of Computer and Information Science.
    Wikström, Anna
    Linköping University, Department of Computer and Information Science.
    Åhlander, Johannes
    Linköping University, Department of Computer and Information Science.
    Linping - Linqueueping without queue: A case study in developing navigable and readable webapplications that are perceived as trustworthy by their users2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to attempt to create a usable and trustable web application for selling event tickets capable of better satisfying the needs of students and event arrangers at Linköping University than contemporary methods. At the moment of writing all such tickets are sold physically and students are required to queue to acquire tickets. Throughout the study the application was user-tested and metrics regarding readability, navigability, and perceived trustability were tracked. The tests made use of the Concurrent Think Aloud method, the Retrospective Probing method, Smith’s Lostness formula, contrast checking tests, and the LIX readability formula. The test results improved throughout the development process and finally showed that the application could indeed be considered readable, navigable, and in several ways perceived as trusted by its users. The study resulted in an application that with a few modifications, including but not limited to student union discounts and stability concerns, could successfully simplify the vending process for event tickets at Linköping University, or lay a theoretical foundation necessary for future developers to make an application capable of fulfilling either this or similar needs.

  • 16.
    Habrman, Robert
    Linköping University, Department of Computer and Information Science.
    Creating a Database and a User Interface for Storing Test Data for Radar Equipment2017Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
  • 17.
    Alesand, Elias
    et al.
    Linköping University, Department of Computer and Information Science.
    Sterneling, Hanna
    Linköping University, Department of Computer and Information Science.
    A shoulder-surfing resistant graphical password system2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The focus of this report is to discuss graphical password systems and how they can contribute to handle security problems that threaten authentication processes. One such threat is shoulder-surfing attacks, which are also reviewed in this report. Three already existing systems that are claimed to be shoulder-surfing resilient are described and a new proposed system is presented and evaluated through a user study. Moreover, the system is compared to the mentioned existing systems to further evaluate the usability, memorability and the time it takes to authenticate. The user study shows that test subjects are able to remember their chosen password one week after having registered and signed in once. It is also shown that the average time to sign in to the system after five minutes of practice is within a range of 3.30 to 5.70 seconds. The participants in the experiments gave the system an average score above 68 on the System Usability Scale, which is the score of an average system.

  • 18.
    Larsson, Martin
    et al.
    Linköping University, Department of Computer and Information Science.
    Silfver, Anton
    Linköping University, Department of Computer and Information Science.
    Signal-aware adaptive timeout in cellular networks: Analysing predictability of link failure in cellular networks based on network conditions2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cellular networks are becoming more common, this introduces new challenges in dealing with their error prone nature. To improve end-to-end performance when the first link in the connection is wireless, an adaptive timeout based on network conditions is constructed. Relevant network factors are identified by examining data collected by a device located in a vehicle moving around in southern Sweden. Channel Quality Indicator (CQI) is shown to be the primary predictor of errors in the connection. In our datasets, a CQI index of 2 is a very good predictor of an error prone state. The collected data is split into training and evaluation data, the training data is used to construct a model. An adaptive timeout mechanism which uses this model is proposed, the mechanism is shown to be superior in all tested cases in the dataset compared to the optimal static counterpart. Reducing timeouts allows for applications to make new decisions based on new information faster, increasing responsiveness and user satisfaction.

  • 19.
    Elina, Lundberg
    et al.
    Linköping University, Department of Computer and Information Science.
    Cecilia, Malmrud
    Linköping University, Department of Computer and Information Science.
    Survey of companies internal security2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This survey aimed to examine and analyze six companies' internal security. Six interviews were held with different sized companies, where the size of the office ranged from under ten to around 800 employees. The interviews contained questions regarding their information security, their perimeter security as well as the employees' personal security. The larger companies had more policies and security procedures than the smaller companies. Virus protection, banning USB flash drives from outside the company, security education and a well functioning report system are vital for a satisfying internal security.

    Interviewees from the smaller companies saw internal security principles as a necessity but also as an obstacle. The larger companies saw the same principles as something that would improve their security. These companies also had implemented more safety measures both in software, such as remote controls and guidelines for employees. Targeting problem areas with special educational campaigns helps employees defend themselves against social engineering.

    All companies that participated either develops software or are consultant companies in IT. They deliver IT solutions in one way or another and their internal security should reflect the same high standard and IT maturity. The smaller companies did not perform any risk analyses on which threats their company faces and did not have any safeguards in place if their employees do not conduct themselves correctly on their networks. Our opinion is that this should not be limited by the size of a company and all companies should perform risk analyses to be able to improve their internal security in the future.

  • 20.
    Gustafsson, Oskar
    et al.
    Linköping University, Department of Computer and Information Science.
    Hellenberg, Rickard
    Linköping University, Department of Computer and Information Science.
    Evaluating performance of a fault-tolerant system that implements replication and load balancing2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Companies and organizations increasingly depend on their computer systems to help them in their work. This means that the availability of these computer systems becomes even more important as organizations are increasingly dependent on it to function. Therefore, fault tolerance needs to be considered when designing a computer system. However, when implementing fault tolerance to increase the availability it may affect the performance of the system. This thesis describes an implementation of a system that provides fault tolerance against fail-stop faults and analyzes the performance. The system consist of a primary server and a backup server and each has a GO web server and a MySQL database installed. MySQL has a built-in functionality for replication that is used to replicate the data from the primary to the replica. Two different approaches for replication are used and compared in this thesis. The system also has a load balancing server with a program called HAProxy installed. The program is used to switch between servers in case of a failure and enables load balancing between the servers, although this setup only allows for read requests to be sent to the backup server. The measurements of the implemented system shows that enabling load balancing for read requests has little effect on lower the response time when the system is under low load. For 25 users the response time was just 5 ms faster when enabling load balancing. For 50 users however, the response time was 33 ms faster when enabling load balancing. The system was evaluated using measurements of the response time and the percentage of stale data under different network loads and different requests from the system. Two different methods of replication in MySQL: asynchronous and semisynchronous were tested to see how they affect the response time and the consistency of the system. The measurements show asynchronous replication has a lower response time, but semisynchronous replication has less stale data. This means that choosing between asynchronous or semisynchronous replication is a trade-off between choosing lower response time or choosing less stale data and less risk of losing data.

  • 21.
    Bolin, Mårten
    et al.
    Linköping University, Department of Computer and Information Science.
    Dietmann, Andreas
    Linköping University, Department of Computer and Information Science.
    Granat, Elvin
    Linköping University, Department of Computer and Information Science.
    Jönsson, Emelie
    Linköping University, Department of Computer and Information Science.
    Modigh, Edvin
    Linköping University, Department of Computer and Information Science.
    Olausson, Erik
    Linköping University, Department of Computer and Information Science.
    Pettersson, Ellinor
    Linköping University, Department of Computer and Information Science.
    Sidén, Erik
    Linköping University, Department of Computer and Information Science.
    Att utveckla en trovärdig och användbar webbapplikation: Spacefinder - Framtagning av en webbapplikation för uthyrning av förråd och andra förvaringsutrymmen.2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The purpose of this report is to develop a web application to support the current issue, with the aid of theory and practical knowledge, "How should an e-store for ad slots be designed to gain confidence in the visitors and be useful with regard to navigability, relevance of content And readability?". A literature study was conducted and theory compiled to provide a basis for development. The process followed relevant theories and the web application was built with modern technological solutions. The final product provides relevant features and applications, which were then tested by a number of external testers, after which a survey could be answered. Based on this data, it could then be concluded that the web application complied with the requirements that are fundamentally considered to be a useful, navigable and credible web application. The original question can thus be answered with this report's theory, method and implementation.

  • 22.
    Weilandt, Jacob
    Linköping University, Department of Computer and Information Science.
    Individual Workload's Relation to Team Workload: An investigation2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    There is an ongoing debate regarding the construct of team workload and a central point in that debate is team workload’s relation to individual workload. This study set out to investigate this relationship. To assess the participants workload a microworld called C3Fire was used to simulate a complex control situation in which teams had to cooperate to complete the task of fighting a forest fire. Twelve teams that consisted of four members in each team were recruited. In the microworld each member of the team took on one out of four separate roles and completed three different scenarios with varying degree of difficulty in C3Fire. After each scenario, a number of questionnaires aimed at gauging different aspects of the teams’ experience in the microworld was administered. The questionnaire in focus of the current study was the DATMA questionnaire, which was used to measure individual workload and team workload. To assert the relationship between the two constructs a multiple linear regression was conducted. The results provided showed that individual workload could be used as a significant predictor for modeling team workload. The study therefore concludes that there is evidence for a relationship in which each team members individual workload could be the parts of the total sum of team workload.

  • 23.
    Bergström, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Dackner, Gustav
    Linköping University, Department of Computer and Information Science.
    Frank, Erik
    Linköping University, Department of Computer and Information Science.
    Olsson, Konrad
    Linköping University, Department of Computer and Information Science.
    Sjövall, Emil
    Linköping University, Department of Computer and Information Science.
    Sundqvist, Anton
    Linköping University, Department of Computer and Information Science.
    Wiksten, Elin
    Linköping University, Department of Computer and Information Science.
    Utveckling av webbapplikationen Folkbolaget: En e-handel med användbarhet i fokus2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Microbreweries producing medium-strong beer are struggling to reach out to their customers. With the help of e-commerce, microbreweries can increase their interaction with their target market. E-commerce in Sweden is a growing trend, but in order to succeed with increased customer relations using a digital platform the end users need to feel a certain degree of satisfaction. A contributing factor to the satisfaction rate is that the end user experiences usability. This thesis discusses the results and development process of a useful e-commerce platform from a navigational, readability and responsiveness perspective. The thesis foundation is based on scientific research on usability in terms of navigability, readability and responsiveness. During development the Python and Flask frameworks were used for server operations and the clientside uses HTML, CSS and the Bootstrap framework. Furthermore, the JavaScript library jQuery was used for communication between front- and back-end. After the development phase an evaluation of the web application was conducted using usability testing. Based on presented theory and conducted tests the thesis conclusion states that the web application is useful. This is achieved by the user, regardless of where on the web application it is located, to navigate to the desired part of the web application with a maximum of three clicks. Furthermore, the choice of colour, text size and font is contributing to readability and finally, the use of CSS and Bootstraphas made the web application responsive.

  • 24.
    Fallgren, Per
    Linköping University, Department of Computer and Information Science.
    Thoughts don't have Colour, do they?: Finding Semantic Categories of Nouns and Adjectives in Text Through Automatic Language Processing2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

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

  • 25.
    Alvarsson, Andreas
    Linköping University, Department of Computer and Information Science.
    The development of a sports statistics web application: Sports Analytics and Data Models for a sports data web application2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

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

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

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

  • 26.
    Yildiz, George
    et al.
    Linköping University, Department of Computer and Information Science.
    Iselius, Fredrik
    Linköping University, Department of Computer and Information Science.
    Lundgren, Patrik
    Linköping University, Department of Computer and Information Science.
    Persson, Henrik
    Linköping University, Department of Computer and Information Science.
    Persson Proos, Daniel
    Linköping University, Department of Computer and Information Science.
    Sörliden, Pär
    Linköping University, Department of Computer and Information Science.
    Nilsson, Kristian
    Linköping University, Department of Computer and Information Science.
    Analysera stora mängder video och bildmaterial2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 27.
    Alvila, Markus
    et al.
    Linköping University, Department of Computer and Information Science.
    Johansson, Jonathan
    Linköping University, Department of Computer and Information Science.
    Johansson, Philip
    Linköping University, Department of Computer and Information Science.
    Lenz, Silas
    Linköping University, Department of Computer and Information Science.
    Lindmark, Sebastian
    Linköping University, Department of Computer and Information Science.
    Norberg, Emil
    Linköping University, Department of Computer and Information Science.
    Regard, Viktor
    Linköping University, Department of Computer and Information Science.
    Övervakning och bedömning av flygledares prestanda2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 28.
    Larsson, Kim
    et al.
    Linköping University, Department of Computer and Information Science.
    Ax, Lisa
    Linköping University, Department of Computer and Information Science.
    Dahlgren, Susanna
    Linköping University, Department of Computer and Information Science.
    Joelsson, Oskar
    Linköping University, Department of Computer and Information Science.
    Magnusson, Oscar
    Linköping University, Department of Computer and Information Science.
    Månsson, Daniel
    Linköping University, Department of Computer and Information Science.
    Renius, Olle
    Linköping University, Department of Computer and Information Science.
    Akutplattan: Rädda liv i digitalt format2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 29.
    Palm Myllylä, Johannes
    et al.
    Linköping University, Department of Computer and Information Science.
    Skarman, Frans
    Linköping University, Department of Computer and Information Science.
    Thorarensen, Christian
    Linköping University, Department of Computer and Information Science.
    Vigren, Malcolm
    Linköping University, Department of Computer and Information Science.
    Bränning, Jonathan
    Linköping University, Department of Computer and Information Science.
    Thuresson, Rasmus
    Linköping University, Department of Computer and Information Science.
    Lindberg, Adam
    Linköping University, Department of Computer and Information Science.
    Utveckling av en webbapplikation för avtalshantering med ramverket Ruby on Rails2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

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

  • 30.
    Karlsson, Tobias
    Linköping University, Department of Computer and Information Science.
    Visuell framställningseffekt inom digital tv-miljö2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Abstract

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

  • 31.
    Mo Eriksson, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Hjort, Cian
    Linköping University, Department of Computer and Information Science.
    Uusitalo, August
    Linköping University, Department of Computer and Information Science.
    Kvist, Gustav
    Linköping University, Department of Computer and Information Science.
    Ringman, Noak
    Linköping University, Department of Computer and Information Science.
    Dalgren, Anton
    Linköping University, Department of Computer and Information Science.
    Ramström, Seth
    Linköping University, Department of Computer and Information Science.
    Larsson Alm, Kevin
    Linköping University, Department of Computer and Information Science.
    Simulering i Virtual Reality för prestations- och motivationsförbättring2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

  • 32.
    Herrera Velasquez, Mateo
    Linköping University, Department of Computer and Information Science.
    The Use of Shared Priorities in Prehospital Medical Management2017Independent thesis Basic level (university diploma), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This thesis had the purpose of measuring shared understanding using Shared Priorities (SP) and mental workload using the DATMA-questionnaire within prehospital management teams. This was done during training session that uses the Emergo Train System (ETS), at the Centre of Teaching and Research in Disaster Medicine and Traumatology. Three instructors that work and manage the courses at KMC were also interviewed as a part of the study to get their point of view on SP. A mix-method was used to analyze the data. To calculate SP Kendall’s W was used, and a thematic analysis was used to analyze the interviews. The result of this study found three significant correlations: Overall Team Workload and Team Performance, SP and the indicators from ETS, and Team Performance and the performance indicators from the ETS. The thematic analysis resulted in three themes (Perks and Cons, Approaches, and Educational Initiative) with eight sub-themes.  The conclusion of this study is based on the fact that SP is suitable for measuring and has measured the shared understanding within teams in this specific domain but also that the instructors, that are the possible users of SP, have a positive attitude towards it.

  • 33.
    Ledin, Johanna
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Arts and Sciences.
    Guiding the User: Redesign and Usability Improvement of a Student Thesis Publication Form2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Students struggle with publishing and uploading their thesis in DiVA - the Swedish digital archive for academic papers (Digitala Vetenskapliga Arkivet). In a mixed methods usability test of the publication form with 7 users, it was shown that the overall usability was low. Three aspects of usability were tested using the following metrics: efficiency by total task time, effectiveness by task completion and satisfaction by PSSUQ and SUS. 22 usability problems were found and prioritised using a 0-4 severity rating. Concepts for a new form were brainstormed and evaluated using a variation of a Pugh chart. From the concepts, sketches were created using form design guidelines and were evaluated using Nielsen’s heuristics. Usability problems from the heuristic evaluation were solved and the sketches were translated into a computer prototype which was subsequently usability tested using a mixed methods approach with 6 users. Task completion increased, total time on task decreased significantly, and PSSUQ and SUS increased. Taken together with the qualitative results, the usability of the new prototype was higher than the current system. Important qualities that increase the usability in forms for publishing academic student papers included a wizard structure, explaining terminology and focus on guiding the user. Further studies should include usability studies of other publication types and further validating guidelines for form design.

  • 34.
    Evaldsson, Mattias
    et al.
    Linköping University, Department of Computer and Information Science.
    Grahn, Fredrik
    Linköping University, Department of Computer and Information Science.
    Karlsson, Simon
    Linköping University, Department of Computer and Information Science.
    Johansson, Lenny
    Linköping University, Department of Computer and Information Science.
    Thunberg, Oscar
    Linköping University, Department of Computer and Information Science.
    Wigren, Richard
    Linköping University, Department of Computer and Information Science.
    Sääf, Alexander
    Linköping University, Department of Computer and Information Science.
    Kunderbjudande i molnet: Projektarbete för  Byggvarulistan AB2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 35.
    Wällstedt, Viktor
    et al.
    Linköping University, Department of Computer and Information Science.
    Tchou, Hans
    Linköping University, Department of Computer and Information Science.
    Shosholli, Adrian
    Linköping University, Department of Computer and Information Science.
    Lundberg, Tobias
    Linköping University, Department of Computer and Information Science.
    R. Dani, Janos
    Linköping University, Department of Computer and Information Science.
    Bengtsson, Fredrik
    Linköping University, Department of Computer and Information Science.
    Agbrink, Viktor
    Linköping University, Department of Computer and Information Science.
    Järvelä, Andreas
    Linköping University, Department of Computer and Information Science.
    Webbutveckling med Flask och WordPress2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport handlar om ett projekt åtta studenter på Linköpings universitet genomförde våren 2017, inom ramarna för kursen TDDD96: Kandidatprojekt i programvaruutveckling. Fokuset i projektet var att bygga upp en ny webbplats åt en kund, Musikaliska konstföreningen, som ska ersätta deras gamla webbplats. Projektgruppen valde att göra detta med hjälp av verktyget WordPress. Gruppen valde också att göra en alternativ webbplats med programmeringsspråket Python och ramverket Flask, för att sedan jämföra resultatet mot WordPress-resultatet. Det gruppen valde att jämföra är vilket stöd WordPress respektive Flask ger åt utvecklarna, och vilket av dem som ger lämpligast resultat för kunden. Resultatet blev en färdig hemsida uppbyggd med WordPress, och en prototypsida uppbyggd med Python och Flask. Resultatet visar att det är enklare att få en färdig sida med hjälp av WordPress, men att man genom att skriva kod från grunden i Flask kan få ett betydligt mer användaranpassat system. När det kommer till faktorer som driftkostnader och stöd så visade det sig att WordPress har en klar fördel i jämförelse med Flask.

  • 36.
    Ohlsson, Pontus
    Linköping University, Department of Computer and Information Science.
    Interacting with TV: A Usability Evaluation of the User Experience of a TV UI2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

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

  • 37.
    Gustavsson, Per
    et al.
    Linköping University, Department of Computer and Information Science.
    Gavefalk, Erica
    Linköping University, Department of Computer and Information Science.
    Design and evaluation of a system that coordinate clients to use the same server2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis present a system which examine when clients should select a new server to maximize the number of packets received with the fewest number of server selections. The ratio between the number of packets received and the number of server selections should therefore be as high as possible. To help minimize the number of server selections, the system should be adaptive if the conditions would change. We construct a server selection mechanism which guarantees agreement between clients when called upon by the system. Furthermore, four policies have been created for when the mechanism is to be called. The purpose of this is to find out when and how it is best to switch server and how they can adapt to varying connection failure rates between server and clients. We evaluate the system by running simulations concluding that the policy we call on demand is best, which calls the server selection mechanism when clients have no connection to the server. This policy is the best if the aim is to send as many packets as possible and that the server selection mechanism is called few times with adaption to varying connection failure rates. This would enable the system to provide information even if the conditions will change to the better or to the worse.

  • 38.
    Al-mufti, Summia
    et al.
    Linköping University, Department of Computer and Information Science.
    Jönsson, Rasmus
    Linköping University, Department of Computer and Information Science.
    HTTP/2, Server Push and Branched Video: Evaluation of using HTTP/2 Server Push in Dynamic Adaptive Streaming over HTTP with linear and non-linear prefetching algorithms2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to investigate and test the usage of HTTP/2 in dynamic adaptive video streaming as well as to take a look into how it can be used to benefit prefetching algorithms used with branched video. With a series of experiments the performance gains of using HTTP/2 rather than the older standard HTTP/1.1 has been investigated. The results has shown no significant change to player quality and buffer occupancy when using HTTP/2, though our tests has shown in a slight decrease in overall playback quality when using HTTP/2. When using a linear prefetch of two fragments an average quality improvement of 4.59% has been shown, however, the result is inconclusive due to variations in average quality between different values for how many fragments to prefetch. Average buffer occupancy has shown promise with a maximum increase of 12.58%, when using linear prefetch with three fragments. The values for buffer occupancy gains are conclusive. Two implementations for non-linear prefetching has been made. The first one uses HTTP/2 server push to deliver fragments for prefetching and the second one uses client-side invoked HTTP requests to pull fragments from the server. Using HTTP/2 server push has shown in a decrease of 2.5% in average total load time while using client-side pulling has shown in a decrease of 34% in average total load time.

  • 39.
    Johansson, Markus
    et al.
    Linköping University, Department of Computer and Information Science.
    Andersson, Sebastian
    Linköping University, Department of Computer and Information Science.
    Multi-Video Streaming with DASH2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Multi-video streaming allows the viewer to interact with the stream by choosing andswitching between several different camera angles to view the stream from. For this reportwe implement and evaluate adaptive multi-video streaming with dash.js. With the help ofdash.js and self-made additions, multiple parallel video streams which are synchronized intime are implemented to provide a good user experience with smooth switching betweenstreams. These streams will be delivered according to dash.js own HTTP-based AdaptiveStreaming algorithms to achieve adaptive streams for varying conditions. In order to optimizethe usage of the available bandwidth in terms of video quality in a multi-videoenvironment we implement probabilities of camera switching to adapt qualities and allocatedbandwidth of streams. By utilizing the functions of dash.js we create two prefetchingpolicies and analyze these results together with the standard non-prefetch dash.js implementationin a multi-view video environment. Our results present the improvements interms of stalling with a prefetch implementation and the possibility of a good policy tofurther optimize a multi-view video implementation in terms of stalling, quality and bandwidthusage. Evaluation of dash.js compatibility for a multi-view video environment is alsodiscussed where pros and cons of dash.js in their current state are presented.

  • 40.
    Sjöstrand, Johan
    et al.
    Linköping University, Department of Computer and Information Science.
    Westberg, Sara
    Linköping University, Department of Computer and Information Science.
    Functional and Security testing of a Mobile Application2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    A mobile application has been developed to be used for assistance in crisis scenarios. To assure the application is dependable enough to be used in such scenarios, the application was put under test. This thesis investigates different approaches to functional testing and security testing. Five common methods of generating test cases for functional testing have been identified and four were applied on the application. The coverage achieved for each method was measured and compared. For this specific application under test, test cases from a method called decision table-testing scored the highest code coverage. 9 bugs related to functionality were identified. Fuzz testing is a simple security testing technique for efficiently finding security flaws, and was applied for security testing of our application. During the fuzz test, system security properties were breached. An unauthorized user could read and alter asset data, and it also affected the system's availability. Our overall conclusion was that with more time, creating functional tests for smaller components of the application might have been more effective in finding faults and achieving coverage.

  • 41.
    Koniakowski, Isabella
    Linköping University, Department of Computer and Information Science.
    When Should Feedback be Provided in Online Forms?: Using Revisits as a Measurement of Optimal Scanpath Disruption and Re-evaluating the Modal Theory of Form Completion.2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    In web forms, feedback can be provided to users at different points in time. This study investigates these three ways of providing feedback to find which results in the shortest completion time, which results in the lowest number of gaze revisits to input fields, and which type of feedback the users prefer. This was investigated through development of prototypes that were tested with 30 participants in a within-group design after which they were interviewed about their experiences. Providing feedback instantly or after form submission resulted in significantly shorter completion times than providing feedback after users left a field. Providing feedback instantly also resulted in significantly fewer revisits to input fields compared to providing feedback after leaving a field. Through a thematic analysis, users’ experiences were shown to be the most negative when given feedback after form submission, while the most positive experiences occurred when users were given feedback immediately. The results indicate that providing feedback immediately may be an equally good or better alternative to earlier research recommendations to provide feedback after form submission and that revisits to areas of interest may, with further research, be a measurement of optimal scanpath disruption.

  • 42.
    Lindström, Per
    et al.
    Linköping University, Department of Computer and Information Science.
    Pap, Oscar
    Linköping University, Department of Computer and Information Science.
    Mapping the current state of SSL/TLS2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    The focus of this thesis is to analyze cryptographic protocol and algorithm usage based on three different data sets where the largest set contains one million websites. Ciphers, algorithms and different versions of cryptographic protocols are described and discussed. Some of the common attacks that make the ciphers or protocols obsolete are also presented and explained. In order to obtain the data sets and analyze them, a web crawler and a prober program were developed. The results from the analysis show that more popular websites have better security compared to the not so popular ones. The results also show that many broken and insecure ciphers and protocols are still very popular today. The thesis discusses the use of old software as a potential reason for why so many websites support weak protocols and ciphers. 

  • 43.
    Persson, Jesper
    Linköping University, Department of Computer and Information Science.
    Improving smartphone security with remote attestation2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Smartphones are becoming increasingly powerful and useful in a work environment. This has led to their adoption at the workplace. Many companies hand out smartphones to their employees and allow employees to bring their own devices to work. There are multiple potential vulnerabilities with such a situation. What happens if the device an employee uses to access secret company data with becomes infected by malware? Existing techniques such as remote attestation is widely used on desktop computers using a Trusted Platform Module (TPM) to allow remote parties to determine the integrity of a computer. However, no smartphones come equipped with a TPM, resulting in the need of alternate solutions. This report proposes a remote attestation system for the Android platform that allows employers to detect compromised devices. Any modification to an application is detected and reliably reported to a remote party.

  • 44.
    Folkesson, Carl
    et al.
    Linköping University, Department of Computer and Information Science.
    Haglund, Hannes
    Linköping University, Department of Computer and Information Science.
    Holmgren, Viktor
    Linköping University, Department of Computer and Information Science.
    Härnström, Felix
    Linköping University, Department of Computer and Information Science.
    Touma, Yousif
    Linköping University, Department of Computer and Information Science.
    Westell, Jesper
    Linköping University, Department of Computer and Information Science.
    Övrebö, Olav
    Linköping University, Department of Computer and Information Science.
    Smart inpasseringslösning för Gymsystem: Utveckling av inbyggda system och mobilapplikationer2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta dokument beskriver ett kandidatexamensarbete som har genomförts av sju civilingenjörsstudenter från Tekniska högskolan vid Linköpings universitet. Syftet med arbetet var att utveckla en smart inpasseringslösning för företaget Zoezi AB och deras produkt Gymsystem. Systemet skulle dels bestå av en enkortsdator som styr ett lås och kommunicerar med Gymsystems servrar samt en mobilapplikation som kommunicerar med denna enkortsdator. Den första delen av detta dokument beskriver hur utvecklingen av detta system gick till, hur väl de krav som ställts har uppfyllts samt gruppens gemensamma erfarenheter från att utveckla mjukvara i ett större projekt. Rapporten beskriver hur en sådan lösning kan implementeras så att den skapar värde för kunden, vilka erfarenheter som kan vara intressanta för framtida projekt, vilket stöd en systemanatomi kan ge, hur Arduinoplattformen kan användas för hårdvaruprototyper, vilket stöd Extreme Programming kan ge, samt hur fördelningen av hållbarhetsdimensioner i ett sådant projekt kan se ut. Följande slutsatser kan dras utifrån projektet: Det implementerade systemet som beskrivs i rapporten skapar värde för kunden. Agila utvecklingsmetoder rekommenderas varmt inför framtida projekt. En systemanatomi ger bra stöd vid aktivitetsformulering. Arduinoplattformen är en bra plattform för hårdvaruprototyper men innebär vissa prestandabegränsningar. Extreme Programming ger bra stöd för en sådan projektgrupp som beskrivs i rapporten. Slutligen kan en skev fördelning av hållbarhetsdimensioner förväntas om dessa inte behandlas medvetet i projektets tidigare faser. Dokumentet senare del består av ett antal bilagor som innehåller individuella utredningar skrivna av gruppens medlemmar. Dessa bilagor utreder olika ämnen som i någon form har anknytning till antingen arbetet i detta projekt eller till mjukvaruprojekt i allmänhet.

  • 45.
    Jaber, Amanda
    Linköping University, Department of Computer and Information Science.
    Hur störningar hanteras i betalsystemen hos livsmedel-, bränsle- och bankbranscher: Att utveckla gemensam resiliens när betalsystemet slås ut2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    En av de viktigaste infrastrukturerna för att samhället ska fungera är betalsystemet. Slutar det fungera leder det troligtvis till att flera kritiska system påverkas av störningen. Genom att utveckla gemensam resiliens, dvs. förmågan att återhämta sig eller motstå olika störningar i komplexa dynamiska system, samt analysera och skapa medvetenhet om det, kan kriser förhoppningsvis hanteras bättre. Syftet med denna studie är att få en inblick hos de olika branschernas sätt att hantera störningar i betalsystemet. Detta genom intervjuer och analys av data. Därför har sex deltagare från branscherna livsmedel, bränsle och bank intervjuats med semi-strukturerade frågor. Intervjuerna spelades in, data transkriberades och sedan analyserades data med en tematisk analysmetod. Ur analysen uppstod sju teman:

    • Begränsade betalningslösningar och alternativ

    • Kommunikation med kunden

    • Skydda varor, kunder, förtroende och säkerhet

    • Beroende av många aktörer

    • Beroende av att andra löser problemet

    • Personalens förberedelser och utbildning vid en kris

    • Beroende av internet och el

    De slutsatser som kan dras från resultatet är att branscherna och samhället inte är förberedda på ett längre avbrott i betalsystemet. Aktörerna litar helt enkelt på att andra (IT-support) kan lösa problemet i betalsystemet åt dem. De antar också att störningarna bara kan vara som längst i några minuter eller timmar innan IT-supporten löser problemet. De har inga planer eller strategier för att hantera störningar. Eftersom det saknas en plan är det vanligaste svaret hos aktörerna att de troligen får stänga ner sin verksamhet om betalsystemet inte fungerar.

  • 46.
    Rosengren, Malin
    Linköping University, Department of Computer and Information Science.
    Gamification in Energy Production: Application of engaging and motivating game thinking in an optimization tool for production of district heating2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    While digitalization is changing the way we work and live, new methods and strategies are needed for motivating future generations at work. An approach to this is gamification, described as the use of game mechanics and elements for creating motivation and engagement in non-game contexts. In this thesis, theory on gamification is studied along with connecting areas of games, user-centred design and motivation. The theory is used for conducting a case study with a user-centred approach, applied in a design process. The case study investigates the use of an optimization tool for production of district heating, developed by the thesis initiator Sigholm, and used by operating technicians in the control room at power plants. The use and use context of the product is studied where user needs, goals and motivations are addressed and used as design problems to investigate. By applying the theories studied, ideas are generated, visualised, tested and evaluated in a prototype. The results of the case study show that including gamification in a user-centred design process helps in focusing on the user motivations and acts as an inspiration in finding engaging design solutions. Applying gamification in the case study showed that the game mechanics and elements themselves were not appealing to the whole user group, but that solutions directly connected to the user needs and use context were more appreciated. The thesis addresses a wide scope of integrated fields where several areas of further studies are identified.

  • 47.
    Lundberg, Jacob
    et al.
    Linköping University, Department of Computer and Information Science.
    Christensen, Robin
    Linköping University, Department of Computer and Information Science.
    Lundegård, Ylva
    Linköping University, Department of Computer and Information Science.
    Segerbäck, Emil
    Linköping University, Department of Computer and Information Science.
    Sletmo, Patrik
    Linköping University, Department of Computer and Information Science.
    Tiefenbacher, Teo
    Linköping University, Department of Computer and Information Science.
    Vik, Jon
    Linköping University, Department of Computer and Information Science.
    Wajngot, David
    Linköping University, Department of Computer and Information Science.
    Hur är det att vara en robot?2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    När både robotar och VR utvecklas i rask takt är det spännande att se vad för användningsområden de kan utnyttjas inom. I det här projektet har ett gränssnitt mellan VR och robot utvecklats, med målet att kunna bedriva forskning inom kognitionsvetenskap. Projektet har utförts av åtta studenter på Linköpings universitet i form av ett kandidatarbete. Projektet och denna rapport ämnar att besvara om slutprodukten fungerar tillräckligt bra för att kunna bedriva kognitionsvetenskaplig forskning, vilka erfarenheter som kan erhållas från projektet, huruvida en systemanatomi kan understödja arbetet och vilka mjukvarulösningar som kan utnyttjas generellt för att bidra till en hållbar utveckling och om dessa är applicerbara på detta projekt.

    Slutprodukten anses av projektgruppen och beställaren ha tillräcklig funktionalitet för att bedriva viss kognitionsvetenskaplig forskning. Många ovärderliga erfarenheter har erhållits, framför allt hur kommunikation används för arbete inom en projektgrupp med uppdelade ansvarsområden. Även erfarenheter kring kravhantering och versionhantering av binära filer har erhållits. En systemanatomi kan ge stöd på olika sätt under ett projekt som detta. Flera metoder kan utnyttjas för att bidra till hållbar utveckling, men arbetet som krävs är inte värt att utföra i ett projekt av denna storlek.

    Projektgruppen är nöjd med sin insats och projektet i sin helhet. Det har varit en oerhört givande erfarenhet, och vår förhoppning är att beställare och nästa års studenter ska kunna utnyttja produkten och bygga vidare på den. Vi hoppas även att läsare av rapporten ska njuta av läsningen och lära sig något om dess innehåll.

  • 48.
    Hedman, Adrian
    et al.
    Linköping University, Department of Computer and Information Science.
    Nasim, Warhell
    Linköping University, Department of Computer and Information Science.
    Implementing WebRTC to VISIARC Coffee2017Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
  • 49.
    Sjöström, Elin
    Linköping University, Department of Computer and Information Science.
    Cognitive Abilities and their Influence on Speech-In-Noise Information Processing: a Study on Different Kinds of Speech Support and Their Relation to the Human Cognition2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    In this paper, top-down and bottom-up processing were studied regarding their effect on speech-in-noise. Three cognitive functions were also studied (divided attention, executive functioning, and semantic comprehension), and the effect they have on the speech processing and on each other. The research questions asked were if a difference in speech-in noise perception can be observed regarding the different levels of top-down and bottom-up support, if speech-in-noise is related to any of the researched cognitive abilities, and if there exists any correlation between these abilities. The method is a within-subject experimental design, consisting of four different tests: PASAT, to measure attention, LIT, to measure semantic comprehension, TMT, to measure executive functioning and SIN, to measure speech-in noise. The results showed a significant difference between top-down and bottom-up processing, a significant difference between top-down processing in decreasing and increasing conditions could also be seen. A negative correlation between the benefit of top-down support and the semantic comprehension task was found. Regarding the cognitive abilities a few correlations were found; the semantic comprehension task had a positive correlation to both the central executive task and the attentional task, the attentional task had a negative correlation to the central executive task, and both of the central executive subtasks had a positive correlation to each other. Most of the findings were expected, built on earlier cognitive hearing theories and studies.

  • 50.
    Johansson, Vida
    Linköping University, Department of Computer and Information Science.
    Depending on VR: Rule-based Text Simplification Based on Dependency Relations2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The amount of text that is written and made available increases all the time. However, it is not readily accessible to everyone. The goal of the research presented in this thesis was to develop a system for automatic text simplification based on dependency relations, develop a set of simplification rules for the system, and evaluate the performance of the system. The system was built on a previous tool and developments were made to ensure the that the system could perform the operations necessary for the rules included in the rule set. The rule set was developed by manual adaption of the rules to a set of training texts. The evaluation method used was a classification task with both objective measures (precision and recall) and a subjective measure (correctness). The performance of the system was compared to that of a system based on constituency relations. The results showed that the current system scored higher on both precision (96% compared to 82%) and recall (86% compared to 53%), indicating that the syntactic information dependency relations provide is sufficient to perform text simplification. Further evaluation should account for how helpful the text simplification produced by the current system is for target readers.

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