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  • 1.
    Afrim, Philip
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Kartläggning och identifiering av flaskhalsar inom arbetsprocesser för bagagehantering: Kartlägga och analysera förutsättningarna för en effektivare bagagehanteringsprocess för avgående bagage på Landvetter flygplats med hjälp av VSM, ABC-Analys och processkartläggningar.2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Flygplats logistik

  • 2.
    Ahmad, Waqas
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Computationally Efficient Light Field Image Compression using a Multiview HEVC Framework2019Annet (Annet vitenskapelig)
  • 3.
    Ahmad, Waqas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Ghafoor, Mubeen
    COMSATS University Islamabad, Pakistan.
    Tariq, Syed Ali
    COMSATS University Islamabad, Pakistan.
    Hassan, Ali
    COMSATS University Islamabad, Pakistan.
    Sjöström, Mårten
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Olsson, Roger
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Computationally Efficient Light Field Image Compression Using a Multiview HEVC Framework2019Inngår i: IEEE Access, E-ISSN 2169-3536, Vol. 7, s. 143002-143014Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The acquisition of the spatial and angular information of a scene using light eld (LF) technologies supplement a wide range of post-processing applications, such as scene reconstruction, refocusing, virtual view synthesis, and so forth. The additional angular information possessed by LF data increases the size of the overall data captured while offering the same spatial resolution. The main contributor to the size of captured data (i.e., angular information) contains a high correlation that is exploited by state-of-the-art video encoders by treating the LF as a pseudo video sequence (PVS). The interpretation of LF as a single PVS restricts the encoding scheme to only utilize a single-dimensional angular correlation present in the LF data. In this paper, we present an LF compression framework that efciently exploits the spatial and angular correlation using a multiview extension of high-efciency video coding (MV-HEVC). The input LF views are converted into multiple PVSs and are organized hierarchically. The rate-allocation scheme takes into account the assigned organization of frames and distributes quality/bits among them accordingly. Subsequently, the reference picture selection scheme prioritizes the reference frames based on the assigned quality. The proposed compression scheme is evaluated by following the common test conditions set by JPEG Pleno. The proposed scheme performs 0.75 dB better compared to state-of-the-art compression schemes and 2.5 dB better compared to the x265-based JPEG Pleno anchor scheme. Moreover, an optimized motionsearch scheme is proposed in the framework that reduces the computational complexity (in terms of the sum of absolute difference [SAD] computations) of motion estimation by up to 87% with a negligible loss in visual quality (approximately 0.05 dB).

  • 4.
    Anjum, Mahnoor
    et al.
    National University of Sciences and Technology (NUST), Pakistan.
    Khan, Muhammad Abdullah
    National University of Sciences and Technology (NUST), Pakistan.
    Hassan, Syed Ali
    National University of Sciences and Technology (NUST), Pakistan.
    Mahmood, Aamir
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Analysis of RSSI Fingerprinting in LoRa Networks2019Inngår i: 15th International Wireless Communications & Mobile Computing Conference, IEEE, 2019, s. 1178-1183Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Localization has gained great attention in recent years, where different technologies have been utilized to achieve high positioning accuracy. Fingerprinting is a common technique for indoor positioning using short-range radio frequency (RF) technologies such as Bluetooth Low Energy (BLE). In this paper, we investigate the suitability of LoRa (Long Range) technology to implement a positioning system using received signal strength indicator (RSSI) fingerprinting. We test in real line-of-sight (LOS) and non-LOS (NLOS) environments to determine appropriate LoRa packet specifications for an accurate RSSI-to-distance mapping function. To further improve the positioning accuracy, we consider the environmental context. Extensive experiments are conducted to examine the performance of LoRa at different spreading factors. We analyze the path loss exponent and the standard deviation of shadowing in each environment

  • 5.
    Ansari, Rafay Iqbal
    et al.
    Frederick University, Nicosia, Cyprus.
    Pervaiz, Haris
    Lancaster University, UK.
    Chrysostomou, Chrysostomos
    Frederick University, Nicosia, Cyprus.
    Hassan, Syed Ali
    National University of Sciences and Technology (NUST), Pakistan.
    Mahmood, Aamir
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Control-Data Separation Architecture for Dual-Band mmWave Networks: A New Dimension to Spectrum Management2019Inngår i: IEEE Access, E-ISSN 2169-3536, Vol. 7, s. 34925-34937, artikkel-id 8663278Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The exponential growth in global mobile data traffic, especially with regards to the massive deployment of devices envisioned for the fifth generation (5G) mobile networks, has given impetus to exploring new spectrum opportunities to support the new traffic demands. The millimeter wave (mmWave) frequency band is considered as a potential candidate for alleviating the spectrum scarcity. Moreover, the concept of multi-tier networks has gained popularity, especially for dense network environments. In this article, we deviate from the conventional multi-tier networks and employ the concept of control-data separation architecture (CDSA), which comprises of a control base station (CBS) overlaying the data base station (DBS). We assume that the CBS operates on the sub-6 GHz single band, while the DBS possesses a dual-band mmWave capability, i.e., 26 GHz unlicensed band and 60 GHz licensed band. We formulate a multi-objective optimization (MOO) problem, which jointly optimizes conflicting objectives: the spectral efficiency (SE) and the energy efficiency (EE). The unique aspect of this work includes the analysis of a joint radio resource allocation algorithm based on Lagrangian Dual Decomposition (LDD) and we compare the proposed algorithm with the maximal-rate (maxRx), dynamic sub-carrier allocation (DSA) and joint power and rate adaptation (JPRA) algorithms to show the performance gains achieved by the proposed algorithm.

  • 6.
    Aroka, Annabel
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Hur använder man digitalisering för att uppnå hållbarhet?: En fallstudie om hur arbetet med digitalisering tillämpas på nationell och lokal nivå i ambition att uppnå hållbarhet2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Today, Sweden's ambition is to be the best in the world to use the possibilities of digitization, while at the same time aiming to be a leader in the work for sustainable development and Agenda 2030. The study aims to study whether there is a clear connection between how the theory of how one should work with digitization to achieve sustainability applies in the practical work at national and local level. Furthermore, one can use the result to identify how one should use digitization and plan for a more sustainable society.

    The aim of the study is to be able to see what differences and / or similarities there are at the different strategic levels, where the study is limited to comparing Sundsvall's municipality with the rest of Sweden.

    The parameters examined are supported by the theory that William Mitchell has written in his book "e-topia", which describes the connection between digitization and sustainability and answers the question of how to achieve sustainability with the help of digitization.

     

    The report is based on a qualitative method, in which the result is gathered from two interviews and two policy documents, respectively, in order to be compared and discussed in the report's concluding discussion and conclusion part. The result shows that it is the human transformation that is of significant importance both at national and local level, but that there is no clear link to the sustainability work in the national digitization strategy. Instead of focusing on what abilities that are required to be able to use digital techniques or technologies, one should instead focus on how digitalization contributes to the sustainability work in order to eliminate unnecessary processes or steps.

     

  • 7.
    Aslam, Muhammad Shehryar
    et al.
    National University of Sciences and Technology (NUST), Pakistan.
    Khan, Alishba
    National University of Sciences and Technology (NUST), Pakistan.
    Atif, Abeera
    National University of Sciences and Technology (NUST), Pakistan.
    Hassan, Syed Ali
    National University of Sciences and Technology (NUST), Pakistan.
    Mahmood, Aamir
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Qureshi, Hassaan Khaliq
    National University of Sciences and Technology (NUST), Pakistan.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Exploring Multi-Hop LoRa for Green Smart Cities2019Inngår i: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156XArtikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With the growing popularity of Internet-of-Things (IoT)-based smart city applications, various long-range and low-power wireless connectivity solutions are under rigorous research. LoRa is one such solution that works in the sub-GHz unlicensed spectrum and promises to provide long-range communication with minimal energy consumption. However, the conventional LoRa networks are single-hop, with the end devices connected to a central gateway through a direct link, which may be subject to large path loss and hence render low connectivity and coverage. This article motivates the use of multi-hop LoRa topologies to enable energy-efficient connectivity in smart city applications. We present a case study that experimentally evaluates and compares single-hop and multi-hop LoRa topologies in terms of range extension and energy efficiency by evaluating packet reception ratio (PRR) for various source to destination distances, spreading factors (SFs), and transmission powers. The results highlight that a multi-hop LoRa network configuration can save significant energy and enhance coverage. For instance, it is shown that to achieve a 90% PRR, a two-hop network provides 50% energy savings as compared to a single-hop network while increasing 35% coverage at a particular SF. In the end, we discuss open challenges in multi-hop LoRa deployment and optimization.

  • 8.
    Aydogan, Emre
    et al.
    Hacettepe University, Ankara, Turkey.
    Yilmaz, Selim
    Hacettepe University, Ankara, Turkey.
    Sen, Sevil
    Hacettepe University, Ankara, Turkey.
    Butun, Ismail
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Forsström, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    A Central Intrusion Detection System for RPL-Based Industrial Internet of Things2019Inngår i: 2019 15th IEEE International Workshop on Factory Communication Systems (WFCS), IEEE, 2019, artikkel-id 8758024Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Although Internet-of-Things (IoT) is revolutionizing the IT sector, it is not mature yet as several technologies are  still being offered to be candidates for supporting the backbone of this system. IPv6 Routing Protocol for Low-Power and Lossy Networks (RPL) is one of those promising candidate technologies to be adopted by IoT and Industrial IoT (IIoT). Attacks against RPL have shown to be possible, as the attackers utilize the unauthorized parent selection system of the RLP protocol. In this work, we are proposing a methodology and architecture to detect intrusions against IIoT. Especially, we are targeting to detect attacks against RPL by using genetic programming. Our results indicate that the developed framework can successfully (with high accuracy, along with high true positive and low false positive rates) detect routing attacks in RPL-based Industrial IoT networks.

  • 9.
    Basir, Rabeea
    et al.
    School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Islamabad 44000, Pakistan.
    Qaisar, Saad
    School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Islamabad 44000, Pakistan.
    Ali, Mudassar
    School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Islamabad 44000, Pakistan.
    Aldwairi, Monther
    College of Technological Innovation, Zayed University, Abu Dhabi 144534, UAE.
    Ashraf, Muhammad Ikram
    Centre for Wireless Communication, University of Oulu, 90014 Oulu, Finland.
    Mahmood, Aamir
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Fog Computing Enabling Industrial Internet of Things: State-of-the-Art and Research Challenges2019Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 21, artikkel-id 4807Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Industry is going through a transformation phase, enabling automation and data exchange in manufacturing technologies and processes, and this transformation is called Industry 4.0. Industrial Internet-of-Things (IIoT) applications require real-time processing, near-by storage, ultra-low latency, reliability and high data rate, all of which can be satisfied by fog computing architecture. With smart devices expected to grow exponentially, the need for an optimized fog computing architecture and protocols is crucial. Therein, efficient, intelligent and decentralized solutions are required to ensure real-time connectivity, reliability and green communication. In this paper, we provide a comprehensive review of methods and techniques in fog computing. Our focus is on fog infrastructure and protocols in the context of IIoT applications. This article has two main research areas: In the first half, we discuss the history of industrial revolution, application areas of IIoT followed by key enabling technologies that act as building blocks for industrial transformation. In the second half, we focus on fog computing, providing solutions to critical challenges and as an enabler for IIoT application domains. Finally, open research challenges are discussed to enlighten fog computing aspects in different fields and technologies.

  • 10.
    Beije, Gustav
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Pix2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis is about the creation of a new game framework named Pix and a comparison between it and the game engine Godot. The purpose is to create a game framework that focuses on making the workflow streamlined for the pro- grammer and at the same time giving the programmer a lot of creative power. Pix uses C# as programming language which runs on the .NET Core platform. Pix is built with Entity Component System (ECS) design which means that the design is data-oriented and that it focuses on composition. Thus the ECS design brings with it a clear separation between logic and data. The ECS design also makes it easy to write multithreaded code and to serialize the game world state. The comparison against Godot shows clear differences between how you use them and the philosophy about how the users become familiar with them. The obvious difference between them is that the main time spent working with Godot will be in the graphical user interface. In Pix on the other hand you will only work in a text-editor or an IDE if you do not create your own editor. The coding in Godot is done primarily with the script language GDScript. It is made for creating common game functionality but can’t be used to extend the engine with new advanced functionality. Thus to integrate new more advanced features Godot will need to be recompiled. Being forced to recompile the engine to add new advanced features results in that extending the engine can both be time consuming and challenging. In Pix there is no difference between coding game functionality and extending the framework. This equality in Pix between coding game functionality and extending the framework brings with it that when you can make a game in Pix you can also extend the engine with more functionality. The differences results in that Godot is simpler to learn but also gives the regu- lar user less power. Pix is the opposite of that. I you look at the workflow of us- ing Pix and combine that with the technologies Pix is built upon you can see that Pix differentiates itself from the already existing alternatives. The work- flow Pix provides and the technologies it is built upon shows that Pix can be a good alternative for creating complex games that doesn't need the most ad- vanced graphical features.

  • 11.
    Blank, Fredrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Handlingsplaner och diskussion: Samarbetsverktyg2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    This report discloses the implementation of a collaboration tool in the form of action plans and discussion functionality in behalf of the company ZonderaCom AB (Zondera). The current tool used for this purpose is inflexible, have a hard time meeting customer requirements and therefore needs to be replaced. The new application is part of a larger entity where user management and database schemas are already in place. The functionality of this application consists of issue management, chat/discussion, document management, notes, sharing and printing. For users with higher permissions a summary view will also be available. The application is implemented using ASP.NET Core MVC, Entity Framework (EF) and SQL Server as the database engine. A SPA-based approach is used where the UI (User Interface) is dynamically rendered and loaded via Ajax and partial views. The source code for the application is largely omitted from this report due to business reasons. Interface’s and database schemas are used to display code and database structure.

  • 12.
    Bonafini, Federico
    et al.
    University of Brescia, Italy.
    Depari, Alessandro
    Univeristy of Brescia, Italy.
    Ferrari, Paolo
    University of Brescia, Italy.
    Flammini, Alessandra
    University of Brescia, Italy.
    Pasetti, Marco
    University of Brescia, Italy.
    Rinaldo, Stefano
    University of Brescia, Italy.
    Sisinni, Emiliano
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi. University of Brescia, Italy.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Exploiting localization systems for LoRaWAN transmission scheduling in industrial applications2019Inngår i: 2019 15th IEEE International Workshop on Factory Communication Systems (WFCS), IEEE, 2019, artikkel-id 8757999Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Internet of Things (IoT) paradigm contaminated industrial world, allowing for innovative services. The wireless communications seem to be particularly attracting, especially when complement indoor and outdoor Real Time Location Systems (RTLS) for geo-referencing smart objects (e.g. for asset tracking). In this paper, the LoRaWAN solution is considered for transmitting RTLS data. LoRaWAN is an example of Low Power Wide Area Network: it tradeoffs throughput with coverage and power consumption. However, performance can be greatly improved with limited changes to the standard specifications. In this work, a scheduling layer is suggested above the regular stack for allocating communication resources in a time slot channel hopping medium access strategy. The main innovation is the time synchronization, which is obtained opportunistically from the ranging devices belonging to the RTLSs. The experimental testbed, based on commercially available solutions, demonstrates the affordability and feasibility of the proposed approach. When low-cost GPS (outdoor) and UWB (indoor) ranging devices are considered, synchronization error of few microseconds can be easily obtained. The experimental results show the that time reference pulses disciplined by GPS have a maximum jitter of 180 ns and a standard deviation of 40 ns whereas, if time reference pulses disciplined by UWB are considered, the maximum jitter is 3.3 μs and the standard deviation is 0.7 μs.

  • 13.
    Borg, Madelene
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Is It True2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Studien behandlar en mindre del utav ett större projekt där flera personer är delaktiga. Projektets syfte är att erbjuda en tjänst för att motverka spridningen av falsk information på internet. En del i detta är att skapa en prototyp för att testa hur en sådan tjänst kan se ut och fungera. Frågeställningen som besvaras av studien handlar om hur detta kan åstadkommas med hjälp av webbutveckling. Studiens mål har varit att utveckla och föreslå lösningar till delar av prototypen på klientsidan. Metoder och verktyg som använts är React, Git, Scrum, Visual Studio Code, Jira och Microsoft Teams. Prototypen kommer att bestå av ett plugin för webbläsare, en webbplats samt en databas. Studien kommer att resultera i och visuellt visa lösningsförslag på de delar som författaren utvecklat. Det kommer även att framgå hur prototypen är uppbyggd i sin helhet. Studien har visat hur en tjänst av denna typ kan se ut och fungera. Den har även visat  att det finns många aspekter att ta hänsyn till innan projektet skulle kunna realiseras.

  • 14.
    Borglund, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Att lära av historien2019Inngår i: Festskrift till Björn Fjæstad: Utvecklingen av en forskningsmiljö: Ett verksamhetsnära engagemang på distans / [ed] Erna Danielsson, Roine Johansson, Anna Olofsson, Susanna Öhman, Sundsvall: Mid Sweden University , 2019, s. 83-95Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 15.
    Bosse, Sebastian
    et al.
    Fraunhofer Institute for Telecommunications – Heinrich Hertz Institute, Berlin, Germany.
    Brunnström, Kjell
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi. Research Intstitutes of Sweden AB.
    Arndt, Sebastian
    Norwegian University of Science and Technology, Trondheim, Norway.
    Martini, Maria G.
    Kingston University, London, UK.
    Ramzan, Naeem
    University of the West of Scotland, Hamilton, UK.
    Engelke, Ulrich
    CSIRO Data61, Kensington, Australia.
    A common framework for the evaluation of psychophysiological visual quality assessment2019Inngår i: Quality and User Experience, ISSN 2366-0139, E-ISSN 2366-0147, Vol. 4, nr 3Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The assessment of perceived quality based on psychophysiological methods recently gained attraction as it potentially overcomes certain flaws of psychophysical approaches. Although studies report promising results, it is not possible to arrive at decisive and comparable conclusions that recommend the use of one or another method for a specific application or research question. The video quality expert group started a project on psychophysiological quality assessment to study these novel approaches and to develop a test plan that enables more systematic research. This test plan comprises of a specifically designed set of quality annotated video sequences, suggestions for psychophysiological methods to be studied in quality assessment, and recommendations for the documentation and publications of test results. The test plan is presented in this article.

  • 16.
    Butun, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Location Privacy Assured Internet of Things2019Inngår i: Proceedings of the 5th International Conference on Information Systems Security and Privacy / [ed] Paolo Mori, Steven Furnell and Olivier Camp, Setúbal, Portugal: SciTePress, 2019, Vol. 1, s. 623-630Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Internet of Things (IoT) is in the booming age of its growth, therefore a vast amount of applications, projects, hardware/software solutions, and customized concepts are being developed. The proliferation of IoT will enable location-based services to be available everywhere for everyone, and this will raise a large number of privacy issues related to the collection, usage, retention, and disclosure of the user’s location information. In order to provide a solution to this unique problem of IoT, this paper proposes Location Privacy Assured Internet of Things (LPA-IoT) scheme, which uses the concepts of Mix-Zone, location-obfuscation along with context-awareness. To the authors’ best knowledge, the proposed LPA-IoT scheme is the first location-based privacy-preserving scheme for IoT that provides flexible privacy levels associated with the present context of the user.

  • 17.
    Butun, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Pereira, Nuno
    School of Engineering (DEI/ISEP), Polytechnic of Porto (IPP), 4200-072 Porto, Portugal.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Security Risk Analysis of LoRaWAN and Future Directions2019Inngår i: Future Internet, ISSN 1999-5903, E-ISSN 1999-5903, Vol. 11, nr 1, artikkel-id 3Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    LoRa (along with its upper layers definition—LoRaWAN) is one of the most promising Low Power Wide Area Network (LPWAN) technologies for implementing Internet of Things (IoT)-based applications. Although being a popular technology, several works in the literature have revealed vulnerabilities and risks regarding the security of LoRaWAN v1.0 (the official 1st specification draft). The LoRa-Alliance has built upon these findings and introduced several improvements in the security and architecture of LoRa. The result of these efforts resulted in LoRaWAN v1.1, released on 11 October 2017. This work aims at reviewing and clarifying the security aspects of LoRaWAN v1.1. By following ETSI guidelines, we provide a comprehensive Security Risk Analysisof the protocol and discuss several remedies to the security risks described. A threat catalog is presented, along with discussions and analysis in view of the scale, impact, and likelihood of each threat. To the best of the authors’ knowledge, this work is one of the first of its kind, by providing a detailed security risk analysis related to the latest version of LoRaWAN. Our analysis highlights important practical threats, such as end-device physical capture, rogue gateway and self-replay, which require particular attention by developers and organizations implementing LoRa networks.

  • 18.
    Butun, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Sari, Alparslan
    Department of Computer Engineering, University of Delaware, Newark, Delaware, USA.
    Österberg, Patrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Security Implications of Fog Computing on the Internet of Things2019Inngår i: International Conference on Consumer Electronics (ICCE), IEEE, 2019, artikkel-id 8661909Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Recently, the use of IoT devices and sensors has been rapidly increased which also caused data generation (information and logs), bandwidth usage, and related phenomena to be increased. To our best knowledge, a standard definition for the integration of fog computing with IoT is emerging now. This integration will bring many opportunities for the researchers, especially while building cyber-security related solutions. In this study, we surveyed about the integration of fog computing with IoT and its implications. Our goal was to find out and emphasize problems, specifically security related problems that arise with the employment of fog computing by IoT. According to our findings, although this integration seems to be non-trivial and complicated, it has more benefits than the implications. Index Terms—IoT, IIoT, vulnerabilities, trust, end-device, confidentiality, integrity, availability.

  • 19.
    Butun, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Österberg, Patrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Detecting Intrusions in Cyber-Physical Systems of Smart Cities: Challenges and Directions2019Inngår i: Secure Cyber-Physical Systems for Smart Cities / [ed] Riaz Ahmed Shaikh, Hershey, USA: IGI Global, 2019, s. 74-102Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Interfacing the smart cities with cyber-physical systems (CPSs) improves cyber infrastructures while introducing security vulnerabilities that may lead to severe problems such as system failure, privacy violation, and/or issues related to data integrity if security and privacy are not addressed properly. In order for the CPSs of smart cities to be designed with proactive intelligence against such vulnerabilities, anomaly detection approaches need to be employed. This chapter will provide a brief overview of the security vulnerabilities in CPSs of smart cities. Following a thorough discussion on the applicability of conventional anomaly detection schemes in CPSs of smart cities, possible adoption of distributed anomaly detection systems by CPSs of smart cities will be discussed along with a comprehensive survey of the state of the art. The chapter will discuss challenges in tailoring appropriate anomaly detection schemes for CPSs of smart cities and provide insights into future directions for the researchers working in this field.

  • 20.
    Butun, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Österberg, Patrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Preserving location privacy in cyber-physical systems2019Inngår i: 2019 IEEE Conference on Communications and Network Security (CNS), IEEE, 2019, s. 1-6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The trending technological research platform is Internet of Things (IoT)and most probably it will stay that way for a while. One of the main application areas of IoT is Cyber-Physical Systems (CPSs), in which IoT devices can be leveraged as actuators and sensors in accordance with the system needs. The public acceptance and adoption of CPS services and applications will create a huge amount of privacy issues related to the processing, storage and disclosure of the user location information. As a remedy, our paper proposes a methodology to provide location privacy for the users of CPSs. Our proposal takes advantage of concepts such as mix-zone, context-awareness, and location-obfuscation. According to our best knowledge, the proposed methodology is the first privacy-preserving location service for CPSs that offers adaptable privacy levels related to the current context of the user.

  • 21.
    Bygdeson, Mattias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Utvecklingen av Spotalike2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The goal with this assignment has been to study the product Spotalike and develop a new version to make the product more attractive. The studying of the product was done with the help of user data, such as how Spotalike is being used, what target audience it has, why it's being used, etc. The new version of Spotalike was planned by making design sketches and prototypes which were created as a first step in order to get a better picture of what the result would be. The new version is not available to the public, but it is fully functional and works locally. The solution that was concluded was to develop a music player which is built on the founding principles of the old Spotalike. The music player is developed with React and is powered by Spotify. Besides the old functions there are also new functions that has been implemented, and the interface has been redesigned. There is currently no new user data available to determine the result of the development, since the new version of Spotalike hasn't been made public yet.

  • 22.
    Bylin, Jenniefer
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Riskanalys av självkörande fordon i hamnområden: En kvalitativ studie för interna transporter av containrar2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Today, companies face constant challenges, as the business must constantly be developed in order to compete. As new ports are being built in already existing ones, other opportunities are often made available to develop further and reduce costs and risks. Replacing some labour against automation is one of them. The study aims to ensure the risks of using selfdriving vehicles for the movement of containers in port areas. The work has been carried out at SCA in Tunadal for their new coming terminal. The aim of the study was to examine the risk associated with manpower versus self-driving vehicles exist. If, based on a safety aspect, it is profitable to go towards a more automated business. To carry out the study, documents have been collected describing the accidents in the port, two persons who are extra responsible for the accidents in the port have been interviewed and observations have been made to also see how the self-driving vehicle is to be applied to reality. When processing the data, THERP - Technique for human error rate prediction has been used for mapping the current situation. FMEA - failure mode and effects analysis and FTA - Fault tree analysis has been used to map the future situation with automation. The result shows that from a safety perspective, it is safest to use self-driving vehicles, as it is the human slips that represent the greatest risks in port areas.

  • 23.
    Carlsson, Anna
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    eDiscovery-samverkan för digitalt bevarande2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    För att lösa problemen med långsiktigt digitalt bevarande måste det finnas en samverkan mellan människan, processen och tekniken. Databearbetning är ett viktigt steg att säkra den digitala långtidslagringen av dokument, och att använda samarbetsytor med gemensamma plattformar, för utarbetning mellan arkivinstitutioner. I ett datornätverk som automatiskt ska kunna hitta och kommunicera med annan utrustning i samma nätverk så använder vi dagligen olika system för att öppna våra filer, som i det ursprungliga filformatet har ett "inbyggt" format, som på ett bestämt sätt ordnar data som ska läsas och bearbetas av ett datorprogram. Här krävs att insamlingen av materialet görs korrekt. Behovet av kontaktytor för samarbete är stor och en aktivitet efter lösningar som möjliggör bland annat att uppfylla lagstiftning om bevarande av information pågår. Myndigheter och många företag som ännu inte uppmärksammat problematiken har behovet av lösningar.

  • 24.
    Carlsson, August
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Åqvist, Marcus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Lean´s påverkan på arbetsmiljön: En kvalitativ studie över effekterna på arbetsmiljö och hälsa vid införande av Lean2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    There are many organizations that choose to introduce Lean production in their operations, as these are the concepts that have made the greatest progress in terms of efficiency programs. Since Lean focuses on maximizing customer benefit and minimizing waste of resources in an organisation's business processes, it is often forgotten that the introduction also affects the staff. The purpose of the study is to investigate what effects on the working environment and health that employees in the private sector experience after an introduction of Lean production as a strategy within their organization. The aim of the study has been to answer how a Lean introduction affects the working environment and health. The study is based on Almondy's latest improvement work on the shrinkage process. With the help of an interview study and a general literature study, we have examined what effects a Lean introduction has on the work environment and health. The interview study was conducted at Almondy AB, which is a food producer based in Gothenburg. Searching the literature is done in article databases with keywords linked to the area. By means of a comparative analysis method, the result has been analyzed. There are studies that show that the effects vary depending on the point of view they have had and in which industry the survey was conducted. This means that the effects get a large spread and therefore it is difficult to give a general picture of the effects. The results of the interview study show a positive effect on the work environment as they describe that the physical moments in the process have decreased. The results of the literature study show that more studies are needed to be able to demonstrate the general effects that Lean has on the working environment. But the literature study suggests that there are both negative and positive effects on the work environment and health when introducing Lean. The conclusion suggests that Almondy has had a positive impact on their physical work environment since there has been a decrease in deviation reports. If someone wants to study further in the field, Lean production should be investigated in several industries and examine all aspects of a Lean introduction linked work environment and health.

     

  • 25.
    Carlsson, Olivia
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Auktorisering i system för digitalt bevarande2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The purpose is to investigate, analyze and clarify the relationship between authorization and security policy for digital preservation system. Information security comes into focus when digital preservation systems are discussed. The handling of electronic documents in digital preservation systems is now widespread and a large part of many activities. This means that the business must ensure that it protects against the loss of information stored in the digital preservation system. Authorization and security policy are relevant to archive and information science because digital objects in digital preservation system are to be protected from unauthorized access. With a qualitative method the research will go through security policy, systems and models for access architecture. With open approach and open questions, the research will be summarized with a discussion on the most important conclusions for access management for digital preservation system, which are mainly built on roles. It is of great importance that the company uses roles and authorization levels to ensure that everyone knows with certainty what to do and what they cannot do.

  • 26.
    Davidsson, Viola
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Att välja e-arkiv2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Digitaliseringen har exploderat de senaste 30 åren och tyvärr har inte arkiven hunnit med i denna utveckling. Många kommuner har ännu inte tagit steget ut och infört e-arkiv, från en enkätundersökning som Riksarkivet gjorde 2010 visade det sig att enbart en femtedel av Sveriges kommuner hade infört e-arkiv vilket är väldigt lite med tanke på hur mycket framsteg digitaliseringen har gjort. Det finns två syften med den här uppsatsen; det första är att göra en mindre undersökning för att fånga orsaker till varför vissa kommuner har infört e-arkiv och andra inte.  Den andra är att visa vilka krav det finns på e-arkiv gällande juridiska aspekter, säkerhet, användarvänlighet och vilken kostnad införandet av e-arkiv medför. Uppsatsen är riktad till kommuner med ca 10 000-30 000 invånare där det inte finns samma möjligheter gällande ekonomi och kompetens som en större kommun har. Frågeställningarna är: Vilka krav finns det på e-arkiv gällande juridiska aspekter, säkerhet, användarvänlighet och klarar kommunerna av att bära den kostnaden som e-arkiv medför? Varför har vissa kommuner kommit igång med e-arkiv och andra inte?

    Metod för detta är en kombination av litteraturstudie och intervjustudie. Intervju har gjort med två leverantörer av e-arkiv, som vill vara anonyma i denna uppsats och 4 stycken kommuner, varav två stycken har infört e-arkiv och två stycken inte har e-arkiv. Dessa kommuner har valt för att de är kommuner med ca 10 000-30 000 invånare (som rapporten är riktad till). De valdes också ut för att de ligger i närheten av varandra rent geografiskt och kan därmed ge en mer rättvis bild av resultatet.

    I resultatdelen besvarades samtliga frågor. Krav på juridiska aspekter är Tryckfrihetsförordningen kap. 2 som säger att alla svenska medborgare har rätt att få ta del av allmänna handlingar. Arkivlagen reglerar vad det finns för krav på arkiv, vad syftet är, vad det ska tillgodose och att myndigheterna ska vårda sina arkiv. Gällande kostad fanns det som ambition att få fram en ekonomisk bild vad e-arkiv kostar. En kommun lämnade ut prisuppgifter och den andra kommunen hänvisade till SKL kommentus som har sekretess på prisuppgifterna. Leverantörerna lämnade inte heller ut prisuppgifter och på grund av detta kunde inte en jämförelse göras, men det ges tips på hur upphandling skulle kunna göras. Gällande säkerhet ges det exempel på saker att tänka på som till exempel behörighetsstyrning i e-arkivet för att skydda arkivet från obehöriga. Gällande tillgänglighet har det i denna uppsats valts att betyda hur tillgänglig e-arkivet är för allmänheten och även funktionshindrade. Därför har Ales e-arkiv granskats och de enlig Post och telestyrelsens - Vägledning för webbutveckling har Ale kommun hamnat på 44 %, de har alltså en bit kvar. Som svar på den andra frågan framkom det efter intervjustudien att den största orsaken till att kommunerna inte kommit igång med e-arkiv är att de saknar kompetens och därmed en eldsjäl som driver i frågan samt resurser.

  • 27.
    Dima, Elijs
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Brunnström, Kjell
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi. RISE Research Institutes of Sweden, Division ICT - Acreo.
    Sjöström, Mårten
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Andersson, Mattias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Edlund, Joakim
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Johanson, Mathias
    Alkit Communications AB.
    Qureshi, Tahir
    HIAB AB.
    View Position Impact on QoE in an Immersive Telepresence System for Remote Operation2019Inngår i: 2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX), IEEE, 2019, s. 1-3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we investigate how different viewing positions affect a user's Quality of Experience (QoE) and performance in an immersive telepresence system. A QoE experiment has been conducted with 27 participants to assess the general subjective experience and the performance of remotely operating a toy excavator. Two view positions have been tested, an overhead and a ground-level view, respectively, which encourage reliance on stereoscopic depth cues to different extents for accurate operation. Results demonstrate a significant difference between ground and overhead views: the ground view increased the perceived difficulty of the task, whereas the overhead view increased the perceived accomplishment as well as the objective performance of the task. The perceived helpfulness of the overhead view was also significant according to the participants.

  • 28.
    Ekman, Marcus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Implementation av Lean i traditionell verkstadsmiljö: En fallstudie i ett kollektivtrafikbolag2019Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Denna studie undersöker hur Lean kan implementeras i en traditionell verkstadsmiljö för ett kollektivföretag inom bussbranschen i Sverige. Kollektivtrafikföretagen i Sverige lider av samma problem och det är låga marginaler. Lean kan vara ett sätt att öka sina marginaler på och i denna studie så fokuseras det på en pågående Lean implementation och även tidigare implementationer inom fallföretaget. Studien är gjord som en fallstudie med mixad metod dvs att den innehåller både kvalitativa och kvantitativa delar samt att ansatsen är abduktiv.

    Informationen om den pågående Lean implementationen och tidigare satsningar har inhämtas från intervjuer samt observationer. Sedan så har informationen analyserats och diskuterats för att komma fram till en slutsats. Den är att Lean kan implementeras i en traditionell verkstadsmiljö, men med olika resultat. Det beror på hur man gör det och studien visar att om man väljer att inkludera ledningen från början och utbilda dem innan implementationen sätter i gång så ökar chanserna att det blir lyckat. Först då visar studien att det är ett vinnande koncept. Ett annat problem är även det ärvda arbetssättet som finns i denna miljö, den är mer eller mindre påverkad av en svunnen tid då verksamheten var kommunal och inte hade samma avkastningskrav som idag.

    Fallföretaget som studien är gjord på har tidigare implementerat Lean men utan framgång, mycket beroende på att ledningen inte varit inkluderade. Det var en externpart som var den som utförde implementationen, det gjorde att det var svårt för underhållsledningen att se syftet och målet med implementationen dem var således exkluderade. Däremot har den pågående implementationen fått ett helt annat fäste hos ledningen, mycket därför att implementationen går genom dem. Underhållsledningen har också utbildats i förväg innan implementationen började, vilket studien visar var en av framgångsfaktorerna.

  • 29.
    Eldefrawy, Mohamed
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Butun, Ismail
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Pereira, Nuno
    Polytechnic of Porto (IPP), Porto, Portugal.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Formal security analysis of LoRaWAN2019Inngår i: Computer Networks, ISSN 1389-1286, E-ISSN 1872-7069, Vol. 148, s. 328-339Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Recent Low Power Wide Area Networks (LPWAN) protocols are receiving increased attention from industry and academia to offer accessibility for Internet of Things (IoT) connected remote sensors and actuators. In this work, we present a formal study of LoRaWAN security, an increasingly popular technology, which defines the structure and operation of LPWAN networks based on the LoRa physical layer. There are previously known security vulnerabilities in LoRaWAN that lead to the proposal of several improvements, some already incorporated into the latest protocol specification. Our analysis of LoRaWAN security uses Scyther, a formal security analysis tool and focuses on the key exchange portion of versions 1.0 (released in 2015) and 1.1 (the latest, released in 2017). For version 1.0, which is still the most widely deployed version of LoRaWAN, we show that our formal model allowed to uncover weaknesses that can be related to previously reported vulnerabilities. Our model did not find weaknesses in the latest version of the protocol (v1.1), and we discuss what this means in practice for the security of LoRaWAN as well as important aspects of our model and tools employed that should be considered. The Scyther model developed provides realistic models for LoRaWAN v1.0 and v1.1 that can be used and extended to formally analyze, inspect, and explore the security features of the protocols. This, in turn, can clarify the methodology for achieving secrecy, integrity, and authentication for designers and developers interested in these LPWAN standards. We believe that our model and discussion of the protocols security properties are beneficial for both researchers and practitioners. To the best of our knowledge, this is the first work that presents a formal security analysis of LoRaWAN.

  • 30.
    Eldefrawy, Mohamed
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi. Halmstad Högskola.
    Ferrari, Nico
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Dynamic User Authentication Protocol for Industrial IoT without Timestamping2019Inngår i: 2019 15th IEEE International Workshop on Factory Communication Systems (WFCS), IEEE, 2019, artikkel-id 8757984Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Internet of Things (IoT) technology has succeed ingetting a great attention in the industry where it has been ableand still can solve many industrial intractable issues. The emergingtechnology is suffering from severe security shortcomings.Authentication is a cornerstone of IoT security as it presents the measures of checking the legitimacy of communication’s entities.The Industrial IoT (IIoT) technology has special conditions, resulting from a lack of resources and a shortage of security skills. As far as we can tell, from the literature, IIoT user authentication has not been studied extensively. In 2017 Tai et al. presented an authenticated key agreement for IoT networks. Here we prove that Tai et al. is susceptible to sever security weaknesses, such as;i. stolen smart card attack, ii. unknown key share attack, iii. node capturing attack. In this research article, we offer an innovative IIoT user authentication scheme that can achieve secure remote user authentication without timestamping that requires precise synchronization, it only needs Hashing and Xor-ing. We examine the efficiency of our presented scheme using Tmote Sky node over an MSP430 microcontroller using COOJA simulator as well aswe show its correctness using Scyther verification tool.

  • 31.
    Eldefrawy, Mohamed
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Pereira, Nuno
    The Polytechnic of Porto (IPP), Portugal.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Key Distribution Protocol for Industrial Internet of Things without Implicit Certificates2019Inngår i: IEEE Internet of Things Journal, ISSN 2327-4662, Vol. 6, nr 1, s. 906-917Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The deployment of the Internet of Things (IoT) in industry, called the Industrial IoT (IIoT), is supporting the introduction of very desirable improvements such as increasing production flexibility, self-organization and real-time and quick response to events. However, security and privacy challenges are still to be well addressed. The IIoT requires different properties to achieve secure and reliable systems and these requirements create extra challenges considering the limited processing and communication power available to IIoT field devices. In this research article, we present a key distribution protocol for IIoT that is computationally and communicationally lightweight (requires a single message exchange) and handles node addition and revocation, as well as fast re-keying. The scheme can also resist the consequences of node capture attacks (we assume that captured nodes can be detected by the Gateway and previous works have shown this assumption to be acceptable in practice), server impersonation attacks and provides forward/backward secrecy. We show formally the correctness of our protocol and evaluate its energy consumption under realistic scenarios using a real embedded platform compared to previous state-of-the-art key-exchange protocols, to show our protocol reliability for IIoT.

  • 32.
    Engvall, Tove
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Records roles in Corporate Sustainability Reporting: An explorative study of corporate sustainability reporting from an archives and information science perspective2019Independent thesis Advanced level (degree of Master (Two Years)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Calls for more responsible companies, have led to initiatives and legislations of sustainability reporting, in order to improve corporate transparency and accountability regarding companies economic, environmental and social impact.

    The aim of the research was to explore records roles in corporate sustainability reporting, which is discussed from an archives and information science perspective. Records are regarded as evidence of business activities and therefore crucial to accountability and decision-making processes. A sustainability report is a record, and records are also used to create a sustainability report.

    The thesis is based on a qualitative explorative methodology with interviews as data gathering technique. Interviews were carried out with four employees at three different companies who work with sustainability reporting, a sustainability consultant who works with sustainability reporting, and an auditor who assesses the  companies´ annual and sustainability reports. The interviews have addressed records’ role in different aspects of sustainability reporting, exploring how sustainability reports are created, used and pluralized. As well as how the records, generated as an effect of the reporting process, are used, what impact they have on the business and efficiency of the process. The thesis also explore respondents´ perspectives on reliability and credibility of the reports in relation to records qualities. Results from the interviews have been analysed with the lens of Records Continuum Model and the ISO standard for records management, ISO 15489-1:2016.

    Results show that records are key assets that provide evidential information that enables different functions and benefits –both to companies that report and to stakeholders. Primary benefits of the reporting that have been emphasized are that it enables transparency and accountability, informed decision-making, management of risks, compliance with legislation, ability to demonstrate corporate responsibility and meeting sustainability goals, greater business efficiency, evidence-based analysis and development activities, formation of business culture and identity, and protection of corporate and collective memory about the corporates’ work regarding sustainability. Records are also valuable assets for governance and continuous improvements. It enables to monitor trends and assessment on how the company meets its targets.

    The thesis gives an increased understanding of records’ role in a socio-economic context. It also suggests some areas for further research and development in order for sustainability reporting to further support a sustainable development. One of the major tasks would be to make pluralization of sustainability-related records more efficient, in order to facilitate further utilization of the information. This may enhance corporate accountability and decision making based on sustainability criteria, and would make the work more efficient for companies. The global records governance environment can be improved further, in order to support  global sustainable development. Important is also to raise awareness about the role of trustworthy records.

  • 33.
    Engvall, Tove
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Situating trust challenges of online trade2019Inngår i: Records Management Journal, ISSN 0956-5698, E-ISSN 1758-7689, Vol. 29, nr 1-2, s. 272-286Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose: This paper aims to offer an improved understanding of trust challenges in online trade, providing examples of issues that should be addressed for a trustworthy online environment. It also aims to illustrate how records and recordkeeping can contribute in terms of enabling trust and accountability. Design/methodology/approach: The paper is based on results from a self-ethnographic study of online trade (Engvall, 2017); the results are analyzed further. Kelton, Fleischmann and Wallace’s (2008) model for trust is used to gain a better understanding of the characteristics of the challenges and where they should be addressed. Findings: This paper recognizes that there are different types of trust challenges at different levels – individual, between clients and businesses and at a societal level – that should be addressed at these levels in different ways. Originality/value: This paper provides an understanding of trust challenges in the online environment. 

  • 34.
    Engvall, Tove
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    User participation: what can be learned from the information systems domain?2019Inngår i: Records Management Journal, ISSN 0956-5698, E-ISSN 1758-7689, Vol. 29, nr 3, s. 320-332Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose: Many records professionals are involved in the design and development of recordkeeping systems. To design recordkeeping systems that meet user needs, their perspectives have to be included in the design process. The purpose of this paper is to explore what can be learned from the domain of information systems (IS) regarding user participation in design, and then to reflect on what related to the recordkeeping dimension should be further considered. Design/methodology/approach: The study is based on a review of literature in the IS development field about user participation. Findings: Analysing how users participate in IS development reveals several aspects of interest for records professionals. There are different approaches to, purposes of and driving values in user participation, which should be transparent. For user participation to be successful, an infrastructure has to be in place. The idea of user participation may be a way to include the secondary values of records in the near term, but it may also challenge traditional roles. New issues, such as the archivist’s role as a trusted third party, should be analysed further. Originality/value: This study uses knowledge from the information system field to acquire new knowledge about user participation in design, and relate it to the recordkeeping domain. This study addresses issues surrounding user participation, which has been indicated as an area in need of further development in archives and information science.

  • 35.
    Engvall, Tove
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Anderson, Karen
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Bunn, Jenny
    University College London.
    Flinn, Andrew
    University College London.
    Michetti, Giovanni
    Sapienza University of Rome.
    Gänser, Georg
    InterPARES Trust.
    Cai, Yingfang
    The State Archives Administration of China.
    Henttonen, Pekka
    University of Tempere.
    The role of the records professional2019Inngår i: Trusting Records in the Cloud / [ed] Luciana Duranti & Corinne Rogers, London: Facet Publishing, 2019, 1, s. 223-244Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    With digitalization, professional roles changes. New tasks, skills and collaboration with other professions are needed. This chapter highlight core responsibilities and expertise that records professionals contribute. It also highlight examples from initiatives with open data in Sweden and United Kingdom, as well as development of digitization of accounting in China. 

  • 36.
    Eriksson, John
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Karlsson, Tobias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Visualiseringsverktyg för migrerad kod: Ersättare till Guardien2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Java is one of the most widely used programming languages used today. CSN that previously used 4 GL tool should now migrate to Java development, which means that there is a need for a tool to show dependencies and relationships in the migrated and newly developed Java code. The GuardIEn was previously used in the old code base, but that tool will be wound up after CSN's after migration to Java. The overall purpose of the project is to create a graph database with data that is scanned with the tool jqAssistant. This database is then used by a Java backend that retrieves relationships and nodes from the graph database which is then used with a separate web interface in Angular to visualize all relations between program code

  • 37.
    Eriksson, Marie
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Företagspresentation: Med WordPress och fokus på användbarhet2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The goal of this project has been to develop a website of the type of company presentation with opportunities for time booking for an organic hairdressing salon. The project's focus has been on usability and typography adapted for the web. In order to achieve usability, the project has been carried out based on various methods such as examination of similar systems, investigation to find out users' wishes, user stories, personas and scenarios and a few simpler usability tests. The personas with scenarios that have been developed have then been the basis for the work with the website together with a requirement list. In order to give the company its graphic profile, basic design and layout, a mood board and wireframes have been created. A responsive website prototype has then been developed where parts produced for the graphic profile and images are included. Based on the prototype, a website has been developed with its own theme in the content management system WordPress, to begin with on a local web server and the database MariaDB and finally on a web hosting server. The site's theme, typography, and its features have been developed using HTML, CSS and PHP. Finally, a number of plugins have been installed for various purposes such as contact forms, user role management, time booking, backup, security aspects and search engine optimization. An accessibility test has been carried out with a tool to help evaluate how accessible the content is in both the website prototype and the final website. The report follows the development of a website whose content has been analyzed in the results based on design and construction as well as usability based on design principles, Nielsen's Usability Heuristics, web guidelines and typography. The methods described, used and implemented to achieve usability have probably contributed positively to the development of a website to present a company and its services. Despite this, there is further development potential of the website.

  • 38.
    Etemad, Seyedeh Soma
    et al.
    Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran.
    Mohammadi Limaei, Soleiman
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för ekonomi, geografi, juridik och turism. Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran.
    Olsson, Leif
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Yousefpour, Rasoul
    Department of Forestry Economics and Forest Planning, University of Freiburg, Freiburg, Germany.
    Forest management decision-making using goal programming and fuzzy analytic hierarchy process approaches (case study: Hyrcanian forests of Iran): Forest management decision-making2019Inngår i: Journal of Forest Science, ISSN 1212-4834, E-ISSN 1805-935X, Vol. 65, nr 9, s. 368-379Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this study is to determine the optimum stock level in the forest. In this research, a goal programming method was used to estimate the optimal stock level of different tree species considering environmental, economic and social issues. We consider multiple objectives in the process of decision-making to maximize carbon sequestration, net present value and labour. We used regression analysis to make a forest growth model and allometric functions for the quantification of carbon budget. Expected mean price is estimated using wood price and variable harvesting costs to determine the net present value of forest harvesting. The fuzzy analytic hierarchy process is applied to determine the weights of goals using questionnaires filled in by experts in order to generate the optimal stock level. According to the results of integrated goal programming approach and fuzzy analytic hierarchy processes, optimal volume for each species was calculated. The findings indicate that environmental, economic and social outcomes can be achieved in a multi-objective forestry program for the future forest management plans.

  • 39.
    Falenius, Erik
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Jarl, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Lean – En utveckling från produktion till välfärd och service: En litteraturstudie av hur Lean utvecklats från produktion till välfärds- och servicebranschen2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study consists of two studies around Lean. The studies are limited to two databases and three different sectors, the industry sector where Lean originated from, and the welfare and service sectors.

    The first study is a quantitative pilot study on published articles. The purpose was to get an understanding of what extent the different sectors get published, compared to each other. The result was illustrated in a graph where 40 articles per year were proportionally divided between the three sectors.

    The main study is a literature review where a scoring matrix was used to cull the selected articles. The remaining articles where compared to the “Toyota house” to answer the research questions:

    In what way has the definition of Lean changed from the manufacturing-based improvement philosophy it originated as, to the concept that is used in different sectors today?

    How does the specific sector affect the implementation of Lean, is there a difference in the Lean that is described in the literature compared to the Lean that is used in the welfare or service sectors?

    The study found in the chosen literature is that the sectors that are new at using Lean are using less of the tools available and in a smaller part of the organization, instead of using it on the whole organization. Many case studies where found that describes what tool was used, but not how they were used. One sector with many published articles was the construction sector, but they were overlooked due to the limitations of the study.

  • 40.
    Farag, Hossam
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Enabling Time- and Mission-Critical Applications in Industrial Wireless Sensor Networks2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Nowadays, Wireless Sensor Networks (WSNs) have gained importance as aflexible, easier deployment/maintenance and cost-effective alternative to wired networks,e.g., Fieldbus and Wired-HART, in a wide-range of applications. Initially,WSNs were mostly designed for military and environmental monitoringapplications where energy efficiency is the main design goal. The nodes in the network were expected to have a long lifetime with minimum maintenance while providing best-effort data delivery which is acceptable in such scenarios. With recent advances in the industrial domain, WSNs have been subsequently extended to support industrial automation applications such as process automation and control scenarios. However, these emerging applications are characterized by stringent requirements regarding reliability and real-time communications that impose challenges in the design of Industrial Wireless Sensor Networks (IWSNs) to effectively support time- and mission-critical applications.

    Typically, time- and mission-critical applications support different traffic categories ranging from relaxed requirements, such as monitoring traffic to firm requirements, such as critical safety and emergency traffic. The critical traffic is mostly acyclic in nature and occasionally occurs at unpredictable time instants. Once it is generated, it must be delivered within strict deadlines. Exceeding the delay bound could lead to system instability, economic loss, or even endanger human life in the working area. The situation becomes even more challenging when an emergency event triggers multiple sensor nodes to transmit critical traffic to the controller simultaneously. The unpredictability of the arrival of such a type of traffic introduces difficulties with regard to making a suitable scheduling that guarantees data delivery within deadline bounds. Existing industrial standards and related research work have thus far not presented a satisfactory solution to the issue. Therefore, providing deterministic and timely delivery for critical traffic and its prioritization over regular traffic is a vital research topic.

    Motivated by the aforementioned challenges, this work aims to enable real-timecommunication for time- and mission-critical applications in IWSNs. In this context, improved Medium Access Control (MAC) protocols are proposed to enablea priority-based channel access that provides a timely delivery for acyclic critical traffic. The proposed framework starts with a stochastic modelling of the network delay performance under a priority-oriented transmission scheme, followed by two MAC approaches. The first approach proposes a random Clear Channel Assessment (CCA) mechanism to improve the transmission efficiency of acyclic control traffic that is generated occasionally as a result of observations of an established tendency, such as closed-loop supervisory traffic. A Discrete-Time Markov Chain (DTMC) model is provided to evaluate the performance of the proposed protocol analytically in terms of the expected delay and throughput. Numerical results show that the proposed random CCA mechanism improves the shared slots approach in WirelessHART in terms of delay and throughput along with better transmission reliability.

    The second approach introduces a slot-stealing MAC protocol based on a dynamic deadline-aware scheduling to provide deterministic channel access in emergency and event-based situations, where multiple sensor nodes are triggered simultaneously to transmit time-critical data to the controller. The proposed protocol is evaluated mathematically to provide the worst-case delay bound for the time-critical traffic and the numerical results show that the proposed approach outperforms TDMA-based WSNs in terms of delay and channel utilization.

  • 41.
    Farag, Hossam
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Österberg, Patrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    DeP-D: A Decentralized Primal-Dual Optimization Algorithm for Industrial Wireless Sensor Networks2019Inngår i: 2019 15th IEEE International Workshop on Factory Communication Systems (WFCS), IEEE, 2019, artikkel-id 8757934Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Industrial Wireless Sensor Networks (IWSNs) are emerged as flexible and cost-efficient alternatives to the traditional wired networks in various monitoring and control applications within the industrial domain. Low delay is a key feature of delay-sensitive applications as the data is typically valid for a short interval of time. If data arrives too late it is of limited use which may lead to performance drops or even system outages which can create significant economical losses. In this paper, we propose a decentralized optimization algorithm to minimize the End-to-End (E2E) delay of multi-hop IWSNs. Firstly, we formulate the optimization problem by considering the objective function as the network delay where the constraint is the stability criteria based on the total arrival rate and the total service rate. The objective function is proved to be strictly convex for the entire network, then a Decentralized Primal-Dual (DeP-D) algorithm is proposed based on the sub-gradient method to solve the formulated optimization problem. The performance of the proposed DeP-D is evaluated through simulations and compared with WirelessHART network and the results show that the proposed DeP-D can achieve at least 40% reduction in the average E2E delay.

  • 42.
    Farag, Hossam
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Sisinni, Emiliano
    Brescia University, Brescia, Italy.
    Gidlund, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Österberg, Patrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Priority-Aware Wireless Fieldbus Protocol for Mixed-Criticality Industrial Wireless Sensor Networks2019Inngår i: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 19, nr 7, s. 2767-2780Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Industrial wireless sensor networks are becoming popular for critical monitoring and control applications in industrial automation systems. For such type of applications, providing reliable real-time performance regarding data delivery is considered as a fundamental challenge. The problem becomes more prominent with mixed-criticality systems, where different data flow with different levels of criticality (importance) coexist and characterized by different requirements regarding delay and reliability. In this paper, we propose a wireless fieldbus protocol to enable real-time communication and service differentiation for cluster-based mixed-criticality networks. A process monitoring scenario of plastic extrusion is used to define the protocol requirements and elaborate the working principle of the proposed work. In our proposed protocol, each data flow is scheduled for channel access based on its criticality level using a distributed prioritized medium access mechanism that ensures a guaranteed channel access for the most critical traffic over other traffic types. The performance of the proposed protocol is analyzed analytically using a discrete-time Markov chain model to evaluate the performance in terms of delay and throughput. Moreover, the extensive simulations are conducted to prove the analytical claims and different performance assessments are provided, which also demonstrate the effectiveness of the proposed approach compared with the related existing work.

  • 43.
    Ferrari, Nico
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Context-Based Authentication and Lightweight Group Key Establishment Protocol for IoT Devices2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The concept of the Internet of Things is driven by advancements of the Internet with the interconnection of heterogeneous smart objects using different networking and communication technologies. With the rapidly increasing

    number of interconnected devices present in the life of a person, providing authentication and secure communication between them is considered a key challenge. The integration of Wireless Sensor Networks in the Internet of Things creates new obstacles due to the necessity of finding a balance between the resources utilization and the applied security solutions. In multicast group communications, the energy consumption, bandwidth and processing overhead at the nodes are minimized in comparison to a point-to-point communication system. To securely transmit a message in order to maintain confidentiality of the data and the user’s privacy, usually involves human interaction or the pre-agreement upon some key, the latter unknown to an external attacker. In this thesis, the author proposed an authentication

    protocol based on the similar context between the correct devices and lightweight computationally secure group-key establishment, avoiding any kind of human involvement. The goal is achieved by having the devices calculate a fingerprint from their ambient context and through a fuzzy commitment scheme generating a commitment respectively opening value which is used to generate a common secret key between them. The tests are effected on real world data accumulated from different environments. The proposed scheme is based on elliptic curve cryptography and cryptographic one-way accumulators. Its feasibility is analyzed by implementing the group key establishment phase in the Contiki operating system and by simulating it with the Cooja simulator. Furthermore, the applicability of

    the protocol is analyzed and justified by an analysis of the storage overhead, communication overhead, and energy consumption. The simulator shows an energy consumption of only 112 mJ per node for group key establishment.

    The results obtained in this thesis demonstrate the feasibility of the scheme, it’s computational, and communication costs are further comparable to other similar approaches.

  • 44.
    Forsström, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Blockchain Research Report2019Rapport (Annet vitenskapelig)
    Abstract [en]

    This research report outlines the current research into blockchain technologies as of December 2018. Starting with an overview of the blockchain technology to introduce the theory. To then follow with deep looks into the different aspects of blockchain technologies, investigating the research articles and current state of work in these area, including the forefront of the research frontier. As well as existing blockchain products, an outlook on the future, conclusions that can be drawn from this study. With the intent to both create understand of the technologies, as well as inspire further research work and identifying potential knowledge gaps.

  • 45.
    Forsström, Stefan
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Jennehag, Ulf
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    An Implemented Open Source Blockchain Market for Smart Grids and Microgrids Using Autonomous Agents2019Inngår i: COINS '19 Proceedings of the International Conference on Omni-Layer Intelligent Systems, ACM Digital Library, 2019, Vol. F148162, s. 116-121Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This article presents a system for creating an implemented open energy market for future smart grid systems, microgrids, the Internet of Things, and the Industrial Internet of Things. We also investigate and analyze different aspects of blockchain technologies for this purpose in order to choose the appropriate methods, technologies, and approaches for realizing and implementing the system as an open source project. Based on this analysis, we present our resulting functional implementation of this energy market. Including measurements and a quantitative evaluation of the implementation itself. Showing the potential of the approach, where this implantation can be applied, showing its drawbacks, and finally our planned future work.

  • 46.
    Fredin, Elias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    GNSS undersökning: För bättre precision i smartphones2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    To be able to receive a position from a smartphone user is very valuable. Wit- hout this many applications would not work at all. For many applications the existing position libraries are not good enough, for example augmented reality applications which requires millimeter precision for a good experience. The goal of this report is to study if GNSS positioning can be improved for smartphones.The study focuses mostly on Android and has the goal of using the method “trilateration” to combine multiple satellites position and their distance to a receiver in order to calculate a real position. The projekt consists of two parts: and Android application and a Java Tomcat server. The android applica- tion uses the programming library “Location” to access raw GNSS-data for cal- culating the distance between the receiver and the satellites, which is called “pseudorange”, and the server functions as a REST API which provides GALI- LEO satellites current position. The project tries to combine these parameters in the Application to create a position. Although the report did not succeed in com- bining these parameters to calculate a position, it does describe of it is still pos- sible; which applications has succeeded before and what others ought to think about when starting similar studies. This project would require a bit more time to reach its end goal, but the fact that raw GNSS-data has become available to all developers on Android is a promising development since others may conti- nue or do their own research. This project focuses solely on GALILEO satelli- tes, mostly to time constraints. In future works all available satellite constella- tions should be used for better results.

  • 47.
    Freyschuss, Jesper
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    System för digital skyltning till Fitness4You2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    This report summarizes development of a digital signage system for the client Fitness4You. The goal was to develop a system that can dynamically handle the content that Fitness4You wants to promote via screens located in their facilities. The system's user interface was developed in Angular, which has the task of managing and distributing the content that’s created. The server-side of the system was developed in PHP using Slim Framework with MariaDB as a database. To present the content that was created, the single-board computer Raspberry Pi were used. However, the choice to use Raspberry Pi as a media player was not obvious and questions were raised about how its performance would manage a web-based system. Theories that touches on what digital signage is and how the different technologies behave and how they work together are discussed. The report also touches on parts of the entire life cycle of the project and discusses requirements, modeling, design and code development. The project resulted in an executable system that can manage and present user-created content. However, the system still has some way to go before it can be delivered to Fitness4You. After a short but relatively demanding test, it turned out that the Raspberry Pi is a very capable small computer.

  • 48.
    Försth, Sebastian
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    When your finger isn't enough: New ways to increase the accessibility of mobile phones2019Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    The objective of this study has been to answer three questions. The questions are Can you navigate in a different way than with your fingers, Do you lose any functionality in the application when you are not using your fingers and is the solution a reasonable way to navigate. The study consist of two parts, the first is to create a navigation library with different navigation methods and the second part is to evaluate the navigation methods using user tests. The study shows that it is possible to navigate without the use of fingers and address problems and solution to navigate without the use of fingers. The study shows how different navigation methods perform compared to each other and compared to navigating with the use of fingers.

  • 49.
    Gardner, Angelica
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Improving the Chatbot Experience: With a Content-based Recommender System2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    Chatbots are computer programs with the capability to lead a conversation with a human user. When a chatbot is unable to match a user’s utterance to any predefined answer, it will use a fallback intent; a generic response that does not contribute to the conversation in any meaningful way. This report aims to investigate if a content-based recommender system could provide support to a chatbot agent in case of these fallback experiences. Content-based recommender systems use content to filter, prioritize and deliver relevant information to users. Their purpose is to search through a large amount of content and predict recommendations based on user requirements. The recommender system developed in this project consists of four components: a web spider, a Bag-of-words model, a graph database, and the GraphQL API. The anticipation was to capture web page articles and rank them with a numeric scoring to figure out which articles that make for the best recommendation concerning given subjects. The chatbot agent could then use these recommended articles to provide the user with value and help instead of a generic response. After the evaluation, it was found that the recommender system in principle fulfilled all requirements, but that the scoring algorithm used could achieve significant improvements in its recommendations if a more advanced algorithm would be implemented. The scoring algorithm used in this project is based on word count, which lacks taking the context of the dialogue between the user and the agent into consideration, among other things.

  • 50.
    Gebremichael, Teklay
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationssystem och –teknologi.
    Lightweight Cryptographic Group Key Management Protocols for the Internet of Things2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The Internet of Things (IoT) is increasingly becoming an integral component of many applications in consumer, industrial and other areas. Notions such as smart industry, smart transport, and smart world are, in large part, enabled by IoT. At its core, the IoT is underpinned by a group of devices, such as sensors and actuators, working collaboratively to provide a required service. One of the important requirements most IoT applications are expected to satisfy is ensuring the security and privacy of users. Security is an umbrella term that encompasses notions such as confidentiality, integrity and privacy, that are typically achieved using cryptographic encryption techniques.

    A special form of communication common in many IoT applications is group communication, where there are two or more recipients of a given message. In or-der to encrypt a message broadcast to a group, it is required that the participating parties agree on a group key a priori. Establishing and managing a group key in IoT environments, where devices are resources-constrained and groups are dynamic, is a non-trivial problem. The problem presents unique challenges with regard to con-structing protocols from lightweight and secure primitives commensurate with the resource-constrained nature of devices and maintaining security as devices dynamically leave or join a group.

    This thesis presents lightweight group key management protocols proposed to address the aforementioned problem, in a widely adopted model of a generic IoT network consisting of a gateway with reasonable computational power and a set of resource-constrained nodes. The aim of the group key management protocols is to enable the gateway and the set of resource-constrained devices to establish and manage a group key, which is then used to encrypt group messages. The main problems the protocols attempt to solve are establishing a group key among participating IoT devices in a secure and computationally feasible manner; enabling additionor removal of a device to the group in a security preserving manner; and enabling generation of a group session key in an efficient manner without re-running the protocol from scratch. The main challenge in designing such protocols is ensuring that the computations that a given IoT device performs as part of participating in the protocol are computationally feasible during initial group establishment, group keyupdate, and adding or removing a node from the group.

    The work presented in this thesis shows that the challenge can be overcome by designing protocols from lightweight cryptographic primitives. Specifically, protocols that exploit the lightweight nature of crypto-systems based on elliptic curves and the perfect secrecy of the One Time Pad (OTP) are presented. The protocols are designed in such a way that a resource-constrained member node performs a constant number of computationally easy computations during all stages of the group key management process.

    To demonstrate that the protocols are practically feasible, implementation resultof one of the protocols is also presented, showing that the protocol outperforms similar state-of-the-art protocols with regard to energy consumption, execution time, memory usage and number of messages generated.

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