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  • 1.
    Agrawal, P.
    et al.
    Uppsala Universitet.
    Ahlén, Anders
    Uppsala Universitet.
    Olofsson, Tomas
    Uppsala Universitet.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Long Term Channel Characterization for Energy Efficient Transmission in Industrial Environments2014In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 62, no 8, p. 3004-3014Article in journal (Refereed)
    Abstract [en]

    One of the challenges for a successful use of wireless sensor networks in process industries is to design networks with energy efficient transmission, to increase the lifetime of the deployed network while maintaining the required latency and bit-error rate. The design of such transmission schemes depend on the radio channel characteristics of the region. This paper presents an investigation of the statistical properties of the radio channel in a typical process industry, particularly when the network is meant to be deployed for a long time duration, e.g., days, weeks, and even months. Using 17–20-h-long extensive measurement campaigns in a rolling mill and a paper mill, we highlight the non-stationarity in the environment and quantify the ability of various distributions, given in the literature, to describe the variations on the links. Finally, we analyze the design of an optimal received signal-to-noise ratio (SNR) for the deployed nodes and show that improper selection of the distribution for modeling of the variations in the channel can lead to an overuse of energy by a factor of four or even higher.

  • 2.
    Agrawal, Piyush
    et al.
    Uppsala University.
    Ahlén, Anders
    Uppsala University.
    Olofsson, Tomas
    Uppsala University.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Characterization of Long Term Channel Variations in Industrial Wireless Sensor Networks2014In: IEEE International Conference on Communications (ICC'14), IEEE conference proceedings, 2014Conference paper (Refereed)
  • 3.
    Akbar, Adnan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Influencing Factors on Quality of Experience (QoE) in Mobile Computing2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Applications that can change their behaviour based on the user’s contextual appearance are called context-aware applications. Applications developed for smart phones, which carry a multitude of different sensors, and actuators have gained a huge penetration within the market. Frequent usage of mobile applications such as home automation, friend finder, car accident notification and tracking etc; have seen an increased growth from the user’s perspective. However, for such applications, it is necessary to have knowledge of the performance and cost parameters, which directly affect the QoE of the application users.  This thesis investigates possible context aware behaviours in real time situations and measures the Quality of Experience (QoE) as well as identifying the Packet Delay Variation (PDV). The background and some state-of-the-art technologies are studied, and based on these studies, three scenarios are designed and implemented and based on their QoE, results and conclusions are presented, with the  results obtained  shown by means of   graphical representations of the QoE and PDV values. 

  • 4.
    Andersson, Fredrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Function Practice: Ett verktyg för att öva programmering2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As more and more people choose to learn programming it may be good to practicesolving problems by writing functions that can then be tested to see if theuser has succeeded. Function Practice is a service to be able to practice programmingin exactly this way, by solving tasks of writing functions in differentprogramming languages, the languages that will be used is Java, C ++ andPython. It also provides an easy and convenient way to create such tasks. Theaim of the project is to develop this service by creating a Web service that cancompile and run functions for the different languages, a website that users canwrite and test code, as well as a way to define the tasks to be solved, this is thentested with a user test in a smaller group to see how user-friendly it is, and thefunctionality is tested and compared with some previous solutions. The serviceis tested to see if additional security is needed by trying to run commands onthe host system. The conclusion of the project is that the functionality behindthe service works, however, that the website needs to be a little clearer for it tobe more user-friendly, and that the user should be able to get error messages incase something does not work to make it easier to know what they need to do.Security proves to be an important part when it is possible to execute commandson the host system which gives users full control of the system.

  • 5.
    Andersson, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    3D Video Playback: A modular cross-platform GPU-based approach for flexible multi-view 3D video rendering2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The evolution of depth‐perception visualization technologies, emerging format standardization work and research within the field of multi‐view 3D video and imagery addresses the need for flexible 3D video visualization. The wide variety of available 3D‐display types and visualization techniques for multi‐view video, as well as the high throughput requirements for high definition video, addresses the need for a real‐time 3D video playback solution that takes advantage of hardware accelerated graphics, while providing a high degree of flexibility through format configuration and cross‐platform interoperability. A modular component based software solution based on FFmpeg for video demultiplexing and video decoding is proposed,using OpenGL and GLUT for hardware accelerated graphics and POSIX threads for increased CPU utilization. The solution has been verified to have sufficient throughput in order to display 1080p video at the native video frame rate on the experimental system, which is considered as a standard high‐end desktop PC only using commercial hardware. In order to evaluate the performance of the proposed solution a number of throughput evaluation metrics have been introduced measuring average frame rate as a function of: video bit rate, video resolution and number of views. The results obtained have indicated that the GPU constitutes the primary bottleneck in a multi‐view lenticular rendering system and that multi‐view rendering performance is degraded as the number of views is increased. This is a result of the current GPU square matrix texture cache architectures, resulting in texture lookup access times according to random memory access patterns when the number of views is high. The proposed solution has been identified in order to provide low CPU efficiency, i.e. low CPU hardware utilization and it is recommended to increase performance by investigating the gains of scalable multithreading techniques. It is also recommended to investigate the gains of introducing video frame buffering in video memory or to move more calculations to the CPU in order to increase GPU performance.

  • 6.
    Andersson, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Parallel Simulation: Parallel computing for high performance LTE radio network simulations2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Radio access technologies for cellular mobile networks are continuously being evolved to meet the future demands for higher data rates, and lower end‐to‐end delays. In the research and development of LTE, radio network simulations play an essential role. The evolution of parallel processing hardware makes it desirable to exploit the potential gains of parallelizing LTE radio network simulations using multithreading techniques in contrast to distributing experiments over processors as independent simulation job processes. There is a hypothesis that parallel speedup gain diminishes when running many parallel simulation jobs concurrently on the same machine due to the increased memory requirements. A proposed multithreaded prototype of the Ericsson LTE simulator has been constructed, encapsulating scheduling, execution and synchronization of asynchronous physical layer computations. In order to provide implementation transparency, an algorithm has been proposed to sort and synchronize log events enabling a sequential logging model on top of non‐deterministic execution. In order to evaluate and compare multithreading techniques to parallel simulation job distribution, a large number of experiments have been carried out for four very diverse simulation scenarios. The evaluation of the results from these experiments involved analysis of average measured execution times and comparison with ideal estimates derived from Amdahl’s law in order to analyze overhead. It has been shown that the proposed multithreaded task‐oriented framework provides a convenient way to execute LTE physical layer models asynchronously on multi‐core processors, still providing deterministic results that are equivalent to the results of a sequential simulator. However, it has been indicated that distributing parallel independent jobs over processors is currently more efficient than multithreading techniques, even though the achieved speedup is far from ideal. This conclusion is based on the observation that the overhead caused by increased memory requirements, memory access and system bus congestion is currently smaller than the thread management and synchronization overhead of the proposed multithreaded Java prototype.

  • 7.
    Andersson, Joakim
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Eriksson, Andreas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Konsten att delegera prefix: En jämförelse av automatiserad och statisk konfiguration2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    When it became clear that the number of ipv4 addresses would not be enough, ipv6 was developed. With new features that had been adapted to the infrastructure that had been built up around the world, there was now a replacement for ipv4. But the differences are many and the protocols are not alike at all, especially when looking at the built-in functions. One of these new features in ipv6 is called Prefix Delegation, a simple and convenient way to automatically distribute parts of a larger network into smaller networks. Although there are simple and flexible way to implement this, the existing infrastructure of the Internet may not be so simple. The complexity of the infrastructure forces us to use a variety of routes, both static and dynamic. To get an understanding of how this can differ, we looked at an overview of how the infrastructure might look like and then tested how to solve the addressing through an automated process and a static process. The results shows that the automated solution requires a little more preparation and specified equipment, but the work then becomes easy to control, debug, and document. The static process is more straightforward and requires no special equipment, however, it will be difficult to control, debug, and document where the slightest change can require a lot of work where the risk of complications is great.

  • 8.
    Andersson, Peter
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Blomqvist, Robin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Software Defined Network: Med openflow2016Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The goal for this project is to setup a redundant Software Defined Network for a fictive company. The company should be able to use the network for future network extension. The network will be built in mininet. Mininet is a software that is used to simulate a real network environment. The company should also be able to take the simulated network in mininet and implement it in to a real network. The protocols STP and LACP are implemented in the network by means of the programming language python.

  • 9.
    Arslan, Önder
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    BeSafe: Säkerhetsapplikation2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet beskriver utvecklingen av säkerhetsapplikationen BeSafe vilken utvecklats för IT-konsulttjänsteverksamheten Sogeti. BeSafe kommer i framtiden integreras med två andra applikationer för att tillsammans bilda en större friluftsapplikation.

    Den färdiga applikationen besvarar de verifierbara målen och därmed även problemformuleringen. Applikationen erbjuder användaren möjlighet att stärka den egna säkerheten. Muntliga intervjuer genomfördes för att bestämma design, färger och logotyp för applikationen. Intervjuerna resulterade i en användarvänligare applikation där undersökningen riktade in arbetet mot det gränssnitt BeSafe nu har. BeSafe är utvecklad genom en iterativ process i utvecklingsmiljön Android Studios och riktar sig till enheter baserade på Androids OS. Vidareutveckling av applikationen skulle kunna ske i form av nya funktioner där användaren exempelvis kan tillåta anhöriga få live feedback på vart användaren befinner sig. Det har tagits hänsyn till etiska aspekter under arbetets gång för att värna om användarens integritet. Detta genom notifikationer, minimering av risk för spridning av data genom lagrings- och kommunikationssätt inom applikationen.

  • 10.
    Asklind, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Rapportsystem – Grund för dynamiskt rapportsystem2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Detta projektet har inneburit att skapa en prototyp av en webbapplikation som man förhoppningsvis kommer att kunna använda i framtiden som en grund till att skapa en mer helomfattande applikationen. Projektet handlar om att skapa ett rapportsystem som tillåter företag att få en bättre koll på statusen av sina uppdrag, sina kunder och anställda. Samtidigt som att den tillåter anställda att rapportera in när uppdrag är klara. Då detta är tänkt som en prototyp av en del för en större lösning så har avgränsningar blivit tvungna att göras. Under projektet så har användbarhet, mängd av internet förbrukning och tillgänglighet tagits i aktning under utvecklandet.

  • 11.
    Axell, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    LAN Segmentering: Implementering av VTP version 3 och MST2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The company is on the verge of segmenting their network and the reasons for this are to get a more secure production by creating a controlled and isolated environment, protecting against the spread of virus and  other threats and aswell creating cost savings by not updating or upgrading unnecessary equipment just to meet the network policy. In order to facilitate the company's segmentation needs, this independent project has been about implementing VTP version 3 and MST. VTP sends out VLAN and MST updates around the network and ease the use of PVLAN. MST is a Spanning Tree protocol that enables VLAN to be mapped to instances to save CPU utilization on the switches as well to help load balance the network. The method used was to set up a test environment from backups from the real network where it was tested to implement the new protocols and to see how they acted. An evaluation of the network was made where selected switches and interfaces were measured before the implementation to be compared later with the same measurements after the implementation was completed. It turned out that the results before implementation were low enough that the implementation of MST was postponed until the network segmentation was completed. VTP version 3 was implemented without any problems and three different scenarios with complete configuration were created to help the company take the leap to MST in the future.

  • 12.
    Barac, Filip
    et al.
    Ericsson AB.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Zhang, Tingting
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Sisinni, Emiliano
    University of Brescia.
    Error Manifestation in Industrial WSN Communication and Guidelines for Countermeasures2017In: Wireless Sensor Systems for Extreme Environments: Space, Underwater, Underground and Industrial / [ed] H. F. Rashvand and A. Abedi, John Wiley & Sons, 2017Chapter in book (Refereed)
  • 13.
    Beltramelli, Luca
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Hybrid MAC Mechanism for Energy Efficient Communication in IEEE 802.11ah2017In: Proceedings of the 2017 IEEE International Conference on Industrial Technology (ICIT), IEEE, 2017, p. 1295-1300, article id 7915550Conference paper (Refereed)
    Abstract [en]

    Many applications for machine-to-machine (M2M) communications are characterized by large numbers of devices with sporadic transmissions and subjected to low energy budgets. This work addresses the importance of energy consumption by proposing a new Medium Access Control (MAC) mechanism for improving the energy efficiency of IEEE 802.11ah, a standard targeting M2M communication. We propose to use the features of IEEE 802.11ah MAC to realize a hybrid contention-reservation mechanism for the transmission of uplink traffic. In the proposed mechanism, any device with a buffered packet will first notify the Access Point (AP) during a contention phase before being given a reserved timeslot for the data transmission. We develop a mathematical model to analyse the energy consumption ofthe proposed mechanism and of IEEE 802.11ah. The results show that for a monitoring scenario, the proposed contention reservation mechanism reduces the energy consumption for a successful uplink data transmission by up to 55%.

  • 14.
    Bergman, Ellinor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Sassa – En webbapplikation för kreativa briefs2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Det här projektet har inneburit att skapa en webbapplikation förföretag som vill kunna inhämta information från kund i form avkreativa briefs på ett smidigt sätt innan ett projekt initieras. Dennawebbapplikation har skapats eftersom företaget Nuadesignbehövde ett bättre sätt att hantera inhämtad information. På grundav projektets storlek, samt tidsbegränsningar, så har avgränsningarvarit tvungen att göras. Under projektets gång så har saker somanvändbarhet, tillgänglighet och laddningstider tagits i beräkning.

  • 15.
    Butun, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Pereira, Nuno
    Polytechnic Institute of Porto, Porto, Portugal .
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Analysis of LoRaWAN V1.1 Security2018In: Proceedings of the 4th ACM MobiHoc Workshop on Experiences with the Design and Implementation of Smart Objects (SMARTOBJECTS '18)., ACM Digital Library, 2018Conference paper (Refereed)
    Abstract [en]

    LoRa and the LoRaWAN specification is a technology for Low Power Wide Area Networks (LPWAN) designed to allow connectivity for connected objects, such as remote sensors. Several previous works revealed various weaknesses regarding the security of LoRaWAN v1.0 (the official 1st draft) and these led to improvements included in LoRaWAN v1.1, released on Oct 11, 2017. In this work, we provide the first look into the security of LoRaWAN v1.1. We present an overview of the protocol and, importantly, present several threats to this new version of the protocol. Besides, we propose our own ramification strategies for the mentioned threats, to be used in developing next version of LoRaWAN. The threats presented were not previously discussed, they are possible even within the security assumptions of the specification and are relevant for practitioners implementing LoRa-based applications as well researchers and the future evolution of the LoRaWAN specification.

  • 16.
    Bygdeson, Andreas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Cartographer: En kartbaserad friluftsapplikation2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Målet med det här arbetet har varit att utveckla en friluftsapplikation för människor som rör sig i skog och mark antingen i arbetet eller i privatlivet. Med syfte att låta de skapa och placera ut markörer på en karta med aktivt uppdaterande gps positionering. För att uppnå detta har Google Maps använts som gränssnitt för att hämta och hantera kartinformation och en applikation har designats i flödesscheman utefter kravspecifikationen och i enlighet med Jacob Nielsens användbarhetsprinciper. Hallway test metoden har använts för att utvärdera hur väl användbarhetsdesignen har uppnått sina mål. Applikationen har sedan konstruerats i Java och Android Studio mot Androids mobila plattform. Utvecklingen har följt den planerade designen och uppnått samtliga konkreta mål som specificerades och i synnerhet användbarhetsmålen. Flera funktionella mål har identifierats att kunna optimeras ytterligare och en rad förslag på vidareutveckling av applikationen har tagits fram för eventuella framtida arbeten.

  • 17.
    Bäckstedt, Dennis
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Felsökning och optimering av trådlöst nätverk IEEE 802.11ac2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Wireless networks are growing ever more and the norm is now that in an office or home you can

    settle down with your laptop and work without having to worry about network outlets or wires. IP

    telephony and tablet are now more natural in many users daily lives, and especially IP telephony

    places high demands on the network to which it is connected. Therefore, I have chosen that in this

    report, look at the 802.11 wireless technology developed by the IEEE standardization organization.

    The method I chose to use to accomplish this is to perform a measurement of an existing wire-

    less network. I will then investigate this data in order to hopefully submit a proposal for a better

    network design. As a tool for carrying out this measurement, I have equipment from Ekahau, a

    Finnish company whose main aim is measurement, optimization and troubleshooting of wireless

    networks. What I found out was that the wireless network had major shortcomings. In particular,

    coverage was a matter of concern, not just the lack of coverage, but sometimes even for good cove-

    rage, resulting in sticky clients. I have then presented a design that, in order to minimize costs and

    environmental impact, uses existing equipment, but requires that it be supplemented with 9 new

    access points.

  • 18.
    Bäckström, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Limitations of Azure in GIS Scalability: A performance and migration study2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this study, the cloud platform Windows Azure has been targeted for test implementations of Geographical Information System (GIS) software in the form of map servers and tile caches. The map servers included were GeoServer, MapNik, MapServer and SharpMap, which together with the tile caches, GeoWebCache, MapCache and TileCache, were installed on Windows Azures three different virtual machine roles (Web, Worker and VM). Furthermore, different techniques for scalingapplications and internal role communication are presented, followed by four sets of performance tests. The performance tests attempt to highlight the differences in request times, how the different role sizes handle the load from the incoming requests, how the different role sizes handle many concurrent TCP-connections and how well the incoming requests are load balanced in between the worker roles. The test implementations showed that all map servers and tile caches were successfully installed in Azure, which leads to the conclusion that Windows Azure is suitable for hosting GIS software with similar installation requirements to the previously mentioned software. Four different approaches (Direct mapping, Public Internal Endpoints, Queue and Worker Role Request Broker) are presented showing how Azure allows different methods in order to scale the internal role communication as well as the external client requests. The performance tests provided somewhat inconclusive test results due to hardware limitations in the test setup. This made it difficult to draw concluding parallels between the final results and the expected values. Minor tendencies in performance gain can be seen when scaling the VM size as well as the number of VMs.

  • 19.
    Castberg, Miro
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Adaptor Development: An insight to interfacing with electrical energy meters2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Since energy meters became more advanced and able to send data remotely, energy suppliers have had a need to keep their data managed. This gave birth to energy management systems which gather data from energy meters. However, for every type of meter there needs to be a specialization in the management system.

    Smart Metering Language (SML) is a protocol which was created to transfer meter data in as simple way as possible. Implementing the protocol would result in simpler and less vendor-specific solutions for energy management systems.

    This report follows the process of developing an adaptor between a device using the SML protocol and a system that manages energy meters. The thesis uses different parts of the development process in able to show specializations which were needed by the test device and its vendor. 

    The result sums up the experience of developing an adaptor and the specializations which are needed in the SML protocol.

  • 20.
    Chen, Nan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    An IEEE 802.15.4 Packet Error Classification Algorithm: Discriminating Between Multipath Fading and Attenuation and WLAN2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In wireless sensor networks, communications are usually destroyed by signal attenuation, multipath fading and different kinds of interferences like WLAN and microwave oven interference. In order to build a stable wireless communication system, reactions like retransmission mechanisms are necessary. Since the way we must react to interference is different from the way we react to multipathfading and attenuation, the retransmission mechanism should be adjusted in different ways under those different cicumstances. Under this condition, channel diagnostics for discriminating the causes that corrupt the packets between multipath fading and attenuation (MFA) and WLAN interference are imperative. This paper presents a frame bit error rate (F-BER) regulated algorithm based on a joint RSSI-LQI classifier that may correctly diagnose the channel status. This discriminator is implemented on MicaZ sensor devices equipped with CC2420 transceivers. This discriminator is able to improve the accuracy to 91%. Although we need to wait for 2 or 3 necessary packets to make a decision, higher stability and reliability are presented when operating this discriminator.

  • 21.
    Chen, Zongzhe
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Privacy Preserving Implementation in the E-health System2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    E-health systems are widely used in today’s world, and have a stillbrighter future with the rapid development of smart phones. A fewyears ago, e-health system could only be carried out on computers.But recently, people are using this as a phone application, so thatthey can get information at any time and anywhere. In addition,some smart phones can already measure heart rate and bloodpressure, for example, ‚Instant Heart Rate‛ and ‚Blood PressureMonitor‛. By using these kinds of applications, users can easilymeasure their health data and store them in their mobile phones.However, the problem of privacy has been attracting people’sattention. After uploading their data to the database, users do havethe right to protect their privacy. For instance, even the doctor hasthe authority to obtain the health record; the user's name can behidden, so that the doctor does not know who the owner of this datais. This problem also includes anonymization, pseudonymity,unlinkability, unobservability and many other aspects.In this thesis work, an android application is proposed to solve thisproblem. Users can set their own rules, and all data requests shouldbe dealt with by calling the rules. In addition, a module in the serveris to be developed to carry out the whole process of privacypreserving and the users’ data should be stored in the database.A standard for users to set rules is determined, which is bothdynamical and flexible. The application realizes some additional rulechecking functions to determine whether users have set a valid rule.Privacy rules can be created, deleted, or uploaded. In addition, userscan update their health record and upload it to the database. Theserver will call different protocols to deal with different requests, andthe data which obtains the requests is responded to by calling theusers’ own privacy rules.

  • 22.
    Chukala, Sileshi
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    A Move Towards Practicability: Context Information and User Profile Management for the SensibleThings Platform2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Achievements in academia and industry indicate a move towards the creation of a giant smart system including objects of different sizes, shapes, and purposes where the Internet will be so diverse and more resourceful with the incorporation of different smart devices. Mid Swe-den University took a first step towards providing an appropriate plat-form for Internet of Things applications known as SensibleThings for the emerging intercommunication of “objects”, called Internet of Things. The SensibleThings platform has produced components for sharing sensor-based context information on the Internet, in order to enable Internet of Things applications. In this thesis the plan was to contribute to filling the gap between the IoT and developers in academia as well as in the industries. The aim of the project was to create basic functionality to enable users to find new interesting users on the IoT and prioritize existing users. To this end context information and user profile man-agement is proposed and presented. Furthermore, a comparison be-tween the platform with the proposed extension as well as without was compared and examined.

  • 23. Culver, Stephen
    et al.
    Gidlund, Mikael
    ABB Corporate Research .
    Wang, G.
    Performance of Cooperative relaying with ARQ in Wireless Sensor Networks2009In: Proceedings, 2009, p. 317-319Conference paper (Refereed)
  • 24.
    Deckmar, Johan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Implementations, simplifications and evaluations around Nfc on Android2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Near field communication (Nfc), a contact-range and short-lived message exchange technology, has in recent years become popular in relation to payment-cards, key-cards and ski-passes. With the release of, in particular, the Google Nexus S, which is capable of reading and writing Nfc tags as well as exchanging messages between devices by touch, the roles of consumers have changed from carriers of passive cards to that of active readers. This publicly available hardware technology, embedded into relatively cheap connected smartphones, creates a new field of possibilities in which a complete and complex Nfc-based system can be developed solely by means of software. In this thesis work, the research is in relation to the field of Nfc, ranging from the physical characteristics of the technology to the design of the Nfc API on the Android platform. Nfc-based apps, library and systems are designed, developed and evaluated in terms of performance. The Android apps which are implemented are WiFi and Bluetooth connectors as well as an Nfc-sensor value visualizer. Additionally, two full systems are developed which consists of an Android app, backend server, database and web or PC-client frontend. These two systems are: a web-based high-performance live statistical visualizer of Nfc sensor values and an Nfc-scan based product endorsement, Like-event, presenting the picture and name of a user endorsing a product on the in-store advertisement displays on top of the ads. The system for scanning, distributing and presenting statistics on sensor-values from a specially crafted NfcV-enabled sensor is evaluated in terms of performance along the chain of events starting at the Nfc tag introduction and being dispatched on the mobile phone and ending with the calculations and plot-generation carried out by the browser connected to the backend via a WebSocket. The evaluations show that in a use-case in which the user holds a tablet in one hand and an Nfc-enabled smartphone in the other, the user would experience a mean-delay of 515 milliseconds between putting the device against an NfcV-sensor and seeing the statistical plot, containing the last 1000 values, updated in the browser on the tablet. Additionally, the user would experience a mean-delay of 74 milliseconds between the values being presented on the mobile device itself until they are presented on the tablet in the case of constant streaming from an NfcV connected sensor. The conclusion is that this delay of 74 milliseconds is sufficiently low for the user to feel that the devices are tightly coupled, making it natural to pay attention to the tablet when scanning sensors. Possible use-cases for this include a technician walking between built-in passive NfcV sensors on the factory floor or a nurse walking between patients wearing bandages with built-in passive health-sensors. Finally, the work is discussed in terms of ethics and social impact as development in the tele-healthcare field continues, and a set of Nfc-based applications are suggested including Nfc-tags for interactive product customization, company car management and app deployment.

  • 25.
    Dong, X.
    et al.
    Georgia Tech.
    Gidlund, Mikael
    ABB Corporate Research.
    Culver, Stephen
    NokiaSiemens Networks.
    Impact of Doppler spread and adaptive modulation on TCP throughput in Rayleigh fading channels2010In: AEU - International Journal of Electronics and Communications, ISSN 1434-8411, E-ISSN 1618-0399, Vol. 64, no 11, p. 1082-1089Article in journal (Refereed)
    Abstract [en]

    A number of wireless systems have recently adopted adaptive modulation (AM) schemes to improve its efficiency. In this letter, our aim is to study the impact Doppler spread and adaptive modulation has on transmission control protocol (TCP) throughput in Rayleigh fading channels. We consider a finite state Markov channel (FSMC) model, which is a useful model for analyzing radio channel with nonindependent fading. Furthermore, we use a Markov model for TCP evolution and evaluate the TCP performance by computer simulations. In our simulations we have compared the TCP Reno scheme with TCP Tahoe scheme. The results indicate that a large Doppler spread leads to lower TCP throughput due to more frequent transitions of channel states and modulation schemes which make it difficult for the TCP congestion control mechanism to accommodate the dynamic link characteristics.

  • 26.
    Duan, J
    et al.
    Beijing Jiatong University.
    Yang, D
    Beijing Jiatong University.
    Zhang, S
    Beijing Jiatong University.
    Zhao, J
    Beijing Jiatong University.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    A Trust Management Scheme for Industrial Wireless Sensor Networks2013Conference paper (Refereed)
  • 27.
    Edvinsson, Joakim
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    AR-park för Android: Augmented Reality park i Sundsvall2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Målet med detta projekt är att ta fram en applikationsprototyp för Androidenheter som ska locka användare av applikationen till och tillbaka till broparken i Skönsberg med hjälp av augmented-reality. Applikationen ska känna av om användaren befinner sig inom eller utanför parkens område och visa olika bilder/modeller på specifika GPS-koordinater i det digitala lagret beroende på användarens positionering. Arbetet har genomförts i samarbete med Dohi på uppdrag av Sundsvalls kommun där regelbundna möten hafts med uppdragsgivaren. Utvecklingen av applikationen sker i PhoneGap med Wikitude-plugin. Projektet har resulterat i en applikationsprototyp som använder ActionRanges, som är en typ av GeoFence, för att presentera olika bilder hämtade från en egen server i det digitala lagret beroende på användarens position. Användarna har inom parkens område möjlighet att själv påverka de bilder som visas i det digitala lagret genom att i applikationen ta en bild som laddas upp till servern där bilderna lagras och där bilden som tagits även visar det digitala lagret.

  • 28.
    Ekelund, Barbro
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Webbutik Second Hand Shop2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den här rapporten beskriver det självständiga arbetet med att skapa en webbutik för en second hand butik där klädesplagg visas upp till försäljning. Projektets syfte är att författaren tillsammans med handledaren på den webbaserade tidskriften Illegal Ground ska utveckla en webbplats som lätt kan administreras från ett administratörsgränssnitt samt att vara lätt tillgängligt för kunden/besökaren. Den testas och ska vara lämplig utifrån webbriktlinjer.se. Det innebär att varje individ i samhället ska kunna delta på lika villkor, oavsett etnisk bakgrund eller funktionsnedsättning. Lagen som kom i maj 2018; GDPR ska efterlevas genom att ett pop-up fönster finns på startsidan och vid formulären för registrering av kund och administratör. Det ska bland annat finnas funktionalitet för att webbutikens varor lätt ska kunna bytas ut från klädesplagg till artiklar av annan art, samt applikationen ska kunna lagra information från de olika tabellerna. Det här för att administratören ska kunna plocka ut data vid senare tillfälle. En av sidorna ska vara på engelska, samt det ska finnas en länk till denna på varje webbsida. Webbutiken ska vara allmängiltig för konceptet second hand med de etiska aspekter det innbär och och applikationen ska bygga på responsiv webbdesign och först och främst fungera på mobila enheter, typ Iphone 6. Det är begreppet ”mobile first” som gäller. De tekniker och verktyg som används är HTML, HTML5, CSS, CSS3, media queries, JavaScript, PHP med databas i frågespråket SQL, Bootstrap, Adobe Photoshop CC 2017, Projektledning m fl. Kurslitteratur från samtliga kurser i Webbutvecklingsprogrammet för studier och fördjupning i problem som uppstår under utvecklingen av webbutiken. Här ingår inspelade föreläsningar och relevanta webbsidor på internet. Metoden är främst att via iterationer av prototyper föra utvecklingen av applikationen i rätt riktning. Det hela har resulterat i en webbapplikation enligt mobile first, som fungerar väl vad gäller att registrera konto samt att välja och beställa av det urval av klädesplagg som finns till försäljning. Webbutiken Second Hand Shop fungerar för både kund och administratör. I gränssnittet för administratör finns viktiga funktioner för att organisera ett företags register.

  • 29.
    Embretsen, Axel
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Implementation av virtualiseringstjänst: Skillnader eller brist på det gällande hypervisorer2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is a lot to consider when implementing a virtualization service and if you make a mistake you might have to pay for it later since migrating virtual machines from the system and technologies you are currently using to the new one can be a troublesome task.

    The aim of this project is to compare different technologies for virtualization, mainly hypervisors to see how they differ in features and performance (or how they don't) in order to better understand which technology is appropriate for what to be able to better recommend how a virtualization service should be implemented.

    To accomplish this I set up a single host machine which is to host two different virtual servers: a web server with high requirements for security and a video conference server with high quality requirements.

    The host was to have six different configurations doing this each using a different hypervisor.

    But due to hardware constrains half of the configurations had to be dropped leaving the ones using KVM, Xen and LXD.

    To better understand the security and quality requirements that the virtualization service and its components should meet I created a poll I sent to people in the industry to gather information. It did yield some interesting info but was lacking in details and it was hard to use it for any comparisons.

    In the end the comparisons showed that in most cases it makes little difference what hypervisor you use, and in the other cases it was a bit hard to tell what to make of it.

    As for security and quality there were some minor differences but of little importance.

    LXD does show some smaller advantages for specific situations but at the cost of being unable to run non-Linux virtual machines.

  • 30.
    Engkvist, Tobias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Remote Netlab2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The projects main focus have been to create a system mainly for the users that study network technology on a more advanced level. In order for the students to start to configure the switches and routers they need to access a server with the SSH protocol which was one of the requirements. Another requirement was that only one user should be able to configure at same time (so two users should NOT be able to configure the switches and routers at the same time). The scripting languages that was used was

    bash, shell, perl and expect in order to achieve these goals and requirement. The result shows a finished product and that this project was feasable. The solution is presented as a flowchart as an overview and some regular text that explains the scripts in more depth. There are of course a ton of other ways to solve this problem and a few of them are presented and discussed in the later chapters.

  • 31.
    Eriksson, Adam
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Sharing information between services while avoiding mandatory dependencies: A survey and performance study of possible implementation options2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 32.
    Eriksson, Alexandra
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Leo, Tobias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Data visualization: Handling and visualizing large data sets2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 33.
    Falck, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Säkerhet: IT säkerhet på en myndighet2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 34.
    Famuyiwa, Julius Oluwaseye
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Islam, Fahad
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Wireless Sensor Network Security: Power Consumption of Multicasting (µTESLA) vs. Unicasting Authentication2008Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
  • 35.
    Farag, Hossam
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Mahmood, Aamir
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    PR-CCA MAC: A Prioritized Random CCA MAC Protocol for Mission-Critical IoT Applications2018In: IEEE International Conference on Communications (ICC'18), Kansas, USA, May 2018., 2018Conference paper (Refereed)
    Abstract [en]

    A fundamental challenge in Mission-Critical Internetof Things (MC-IoT) is to provide reliable and timely deliveryof the unpredictable critical traffic. In this paper, we propose an efficient prioritized Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) in MC-IoT control applications. The proposed protocol utilizes a random Clear Channel Assessment (CCA)-based channel access mechanism to handlethe simultaneous transmissions of critical data and to reduce thecollision probability between the contending nodes, which in turn decreases the transmission latency. We develop a Discrete-Time Markov Chain (DTMC) model to evaluate the performance of the proposed protocol analytically in terms of the expected delay and throughput. The obtained results show that the proposed protocolcan enhance the performance of the WirelessHART standard by 80% and 190% in terms of latency and throughput, respectively along with better transmission reliability.

  • 36.
    Ferrari, P.
    et al.
    University of Brescia, Italy.
    Flammini, A.
    University of Brescia, Italy.
    Rizzi, M.
    University of Brescia, Italy.
    Sisinni, Emiliano
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology. University of Brescia, Italy.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    On the evaluation of LoRaWAN virtual channels orthogonality for dense distributed systems2017In: 2017 IEEE International Workshop on Measurement and Network (M&N), IEEE, 2017, p. 85-90, article id 8078371Conference paper (Refereed)
    Abstract [en]

    Internet of Things (IoT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment sensing, pervasive sensing and soon. In the considered scenario, the capacity of the network is of main importance; even if communication is sporadic for most of the time, an event observed by many nodes results in a huge amount of simultaneous transmissions. Are the IoT technologies usable to this end? In this paper LoRaWAN technology is investigated, with the aim of evaluating the orthogonality of virtual channels permitted by the LoRa physical layer. In particular, measurements demonstrated that overlapping transmissions having the same power at the receiver can be correctly decoded if occurring with different spreading factors, whereas co-spread messages require at least 4ms spacing.

  • 37.
    Fink, Christoffer
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Computer and System science.
    InPUTpy: InPUT for Python2014Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    There are many problems where the solution depends heavily on parametertuning and therefore on conguration. Examples include Hill Climbers andvarious Evolutionary Algorithms. The Intelligent Parameter Utilization Tool(InPUT) uses a cross-language format for describing congurations of computerexperiments, thereby aiding in documentation and communication. Itis implemented in Java, and a C++ version is being developed. This meansthat only implementations in statically typed languages currently exist. APython port would thus greatly increase the diversity of implementation languages.The goal of this project was to create an InPUT implementation inPython, and to explore the suitability of a dynamically typed language inthis context. A de facto specication was discovered by creating a suite oflearning tests, and the new implementation was developed using a test-drivenapproach. Several features of Python proved advantageous by simplifying thedevelopment process.

  • 38.
    Forsström, Stefan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Buton, Ismail
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Eldefrawy, Muhamed
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Challenges of Securing the Industrial Internet of Things Value Chain2018In: In proceedings of the IEEE International Workshop on Metrology for Industry 4.0 and IoT, 2018Conference paper (Refereed)
    Abstract [en]

    We see a shift from todays Internet-of-Things (IoT)to include more industrial equipment and metrology systems,forming the Industrial Internet of Things (IIoT). However, thisleads to many concerns related to confidentiality, integrity,availability, privacy and non-repudiation. Hence, there is a needto secure the IIoT in order to cater for a future with smart grids,smart metering, smart factories, smart cities, and smart manufacturing.It is therefore important to research IIoT technologiesand to create order in this chaos, especially when it comes tosecuring communication, resilient wireless networks, protectingindustrial data, and safely storing industrial intellectual propertyin cloud systems. This research therefore presents the challenges,needs, and requirements of industrial applications when it comesto securing IIoT systems.

  • 39.
    Forsström, Stefan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    A Performance and Cost Evaluation of Combining OPC-UAand Microsoft Azure IoT Hub into an Industrial Internet-of-Things System2017In: GIoTS 2017 - Global Internet of Things Summit, Proceedings, IEEE, 2017, p. 327-332, article id 8016265Conference paper (Refereed)
    Abstract [en]

    The expected monetary costs and response time performance is important information to know before deploying an industrial Internet-of-Things system. The system investigated in this paper is built up by combining the Open Plant Communication Universal Architecture and the Microsoft Azure Internet-of-Things Hub. We consider a real life industrial scenario that remotely monitors a piece of industrial equipment consisting of 1500 sensors, of which 600 update their values every second. The measured results show that the response times for a fiber based Internet connection was on average 770 ms with a standard deviation of 330 ms and the same measurements on a mobile internet connection was on average 1150 ms with a standard deviation of 340 ms. Cost wise, the investigated scenario fits within the most expensive price plan for the IoT hub and ends in a total of just over \$5000 per month for the whole cloud service.

  • 40.
    Forsström, Stefan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    A Flexible Sensor and Actuator Gateway for Internet-of-Things Applications2015Conference paper (Refereed)
    Abstract [en]

    There is currently a vast amount of sensors, actuators, and other devices intended to create the Internet-of-Things. However, most of these only operate within a particular manufacturer’s ecosystem and with a limited set of compatible hardware. In response to this we present a general sensor and actuator gateway for the Internet-of-Things, which provides the flexibility to easily exchange sensor and actuator hardware. The gateway is implemented as a proof-of-concept prototype that is verified to be compatible with a wide range of commercial off the shelf hardware. It is also shown to be able to run the SensibleThings platform, a fully distributed and open communication platform for Internet-Things applications.

  • 41.
    Franked, Lennart
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Håsäther, David
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Implementation and evaluation of a queuing discipline in Linux2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Streaming video and VoIP are two popular services used over the Internet, and as the number of users increases, the demand on the network routers also increases. Since both streaming video and VoIP have a variable traffic flow, the routers must always have some free space in their receive buffers to handle traffic bursts. If not, packet loss may occur that will result in a degraded quality of the services. In this project, a fuzzy logic based Active Queue Management (AQM) will be implemented, which might help reduce this problem. This algorithm has currently only been tested in a simulated environment. This algorithm will then be evaluated and compared to some of the existing AQMs. The results will also be compared to a stream that only uses a First-In, First-Out (FIFO) queue, which will work as a baseline. Since an AQM is not the only means used to reduce delay and jitter, different AQMs will also be combined with two different transport protocols, User Datagram Protocol (UDP) and the new Datagram Congestion Control Protocol (DCCP). The resulting implementation performed on a par with RED (Random Early Detection), one of the most common AQMs.

  • 42.
    Fuchs, Harald
    et al.
    Fraunhofer IIS, Erlangen.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Thoma, Herbert
    Fraunhofer IIS, Erlangen.
    Subjective evaluation of low resolution tune-in streams for IPTV fast channel change2009In: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, 2009. BMSB '09., IEEE conference proceedings, 2009, p. 1-5Conference paper (Refereed)
  • 43.
    Fuchs, Harald
    et al.
    Fraunhofer IIS, Erlangen.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Thoma, Herbert
    Fraunhofer IIS, Erlangen.
    Döhla, Stefan
    Fraunhofer IIS, Erlangen.
    Färber, Niko
    Scalable video coding for IPTV fast channel change2009In: Dortmunder Fernsehseminar, 2009Conference paper (Refereed)
  • 44.
    Gidlund, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Han, Song
    University of Connecticut, USA.
    Sisinni, Emiliano
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology. University of Brescia, Italy.
    Saifullah, Abusayeed
    Wayne State University, USA.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Guest Editorial From Industrial Wireless Sensor Networks to Industrial Internet of Things2018In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 14, no 5, p. 2194-2198Article in journal (Refereed)
  • 45.
    Gidlund, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Lennvall, Tomas
    RISE SICS Västerås.
    Åkerberg, Mikael
    ABB Corporate Research.
    Will 5G Become Yet Another Wireless Technologyfor Industrial Automation?2017In: Proceedings of the 2017 IEEE International Conference on Industrial Technology (ICIT), IEEE, 2017, p. 1319-1324, article id 7915554Conference paper (Refereed)
    Abstract [en]

    With the growing interest in adoption of wireless technologies in industrial automation and the continuous search for new revenue streams new players are entering the arena in order to make their business grow further. One of the emerging wireless technologies aiming to support industrial automation applications is 5G, targeting anything from extreme throughput (>10 Gbit/s) to extreme low latency (< 1 ms) to ultra high reliability (>99.999%). In this article we intend to discuss the potential and challenges of adopting 5G in real industrial environments and give a more balanced picture compared to previous articles mainly written by telecom researchers and vendors as a way to promote their technology. Specifically, this article will discuss and provide some real industrial requirements, describe the main technical features of 5G and try to assess what applications it will support that are not by already supported by existing technologies. In the end, the success of 5G will depend on appealing business models and scalability, i.e., whether or not the same equipment can be deployed worldwide without any changes and spectrum rules, and the migration paths beyond 5G for reasonable business risks.

  • 46.
    Gidlund, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Åkerberg, Johan
    ABB Corporate Research.
    Yu, Kan
    Mälardalen University.
    Hagos, Yonas
    Chalmers University.
    Björkman, Mats
    Mälardalen University.
    Implementation and Evaluation of Error Control Schemes in Industrial Wireless Sensor Networks2014Conference paper (Refereed)
  • 47.
    Grimaldi, Simone
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Lennvall, Tomas
    ABB AB, Corporate Research, Sweden.
    Barac, Filip
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Detecting Communication Blackout in Industrial Wireless Sensor Networks2016In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS, 2016, article id 7496502Conference paper (Refereed)
    Abstract [en]

    Communication blackout is one of the most serious pitfalls of Wireless Sensor Networks (WSN) in industrial automation context. The industrial radio channel exhibits pronounced effects of multipath fading and wireless LAN (WLAN) interference that can potentially lead to temporary communication failures, as well as complete isolation of network devices. The current IWSN standards adopt known countermeasures to cope with the harshness of the radio channel, but they lack solutions specifically oriented to detect blackouts and self-recover the communication fulfilling hard deadline constraints. In this work we focus onthe problem of blackout detection with specific interest for the WirelessHART standard, introducing a Blackout Detection Service (BDS) expressly addressed to multi-hop periodic communicationwith sensors and actuators. The BDS monitors end-to-end acknowledgement messages and builds specific metrics to promptly identify communication outages, enabling three criticality classes. The algorithm is tested in the ns-2 network simulator and results show that the proposed system is able to detect blackout events with reaction delays of the order of 4-5 times the refresh rate of nodes and to discriminate between smalland temporary network issues and serious blackout scenarios, opening the field for recovery strategies.

  • 48.
    Grimaldi, Simone
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Mahmood, Aamir
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    An SVM-Based Method for Classification of External Interference in Industrial Wireless Sensor and Actuator Networks2017In: Journal of Sensor and Actuator Network, ISSN 2224-2708, Vol. 6, no 2, article id 9Article in journal (Refereed)
    Abstract [en]

    In recent years, the adoption of industrial wireless sensor and actuator networks (IWSANs) has greatly increased. However, the time-critical performance of IWSANs is considerably affected by external sources of interference. In particular, when an IEEE 802.11 network is coexisting in the same environment, a significant drop in communication reliability is observed. This, in turn, represents one of the main challenges for a wide-scale adoption of IWSAN. Interference classification through spectrum sensing is a possible step towards interference mitigation, but the long sampling window required by many of the approaches in the literature undermines their run-time applicability in time-slotted channel hopping (TSCH)-based IWSAN. Aiming at minimizing both the sensing time and the memory footprint of the collected samples, a centralized interference classifier based on support vector machines (SVMs) is introduced in this article. The proposed mechanism, tested with sample traces collected in industrial scenarios, enables the classification of interference from IEEE 802.11 networks and microwave ovens, while ensuring high classification accuracy with a sensing duration below 300 ms. In addition, the obtained results show that the fast classification together with a contained sampling frequency ensure the suitability of the method for TSCH-based IWSAN

  • 49.
    Gräslund, Andreas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Interaktiva radiotjänster: - en applikation för mobila Androidenheter2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The increase in sales of the so called smart phones has meant that there has also been a requirement to determine new applications for which they are suitable. One of the largest platforms for smart phones is Android and the task of this thesis is to develop an application for a company that wishes to create interactive radio for the Internet. In addition to ordinary radio features, the company would like the application to be able to present images and a small web page called Canvas. The overall aim ,of this thesis, is to build a fully functional media player that is compatible with the majority of the commonly used Android based mobile units. To fulfill the overall aim, nine explicit goals were targeted. The first stage involved studying solutions for each goal and the second stage involved implementing them in the application and the stage involved evaluating the application by enlisting the help of an expert. An application was built that allows the user to choose a radio channel and listen to it whilst interacting with the canvas. The application was built in modules, each of which had its own task, for example dealing with the web services or the sound. The expert tested the application on three mobile units and answered a series of questions regarding the explicit goals. The expert considered that all the goals had been achieved , which can thus be interpreted that a well-functioning media player compatible with Android based units had been created.

    Keywords: Android, compatibility, web services, Java, smart telephone-down, media players

  • 50.
    Guntupalli, Lakshmikanth
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Farag, Hossam
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Mahmood, Aamir
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Gidlund, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.
    Priority-Oriented Packet Transmissions in Internet of Things: Modeling and Delay Analysis2018In: IEEE International Conference on Communications (ICC'18), Kansas, USA, May 2018, 2018Conference paper (Refereed)
    Abstract [en]

    Priority-oriented packet transmission (PPT) has been a promising solution for transmitting time-critical packets in timely manner during emergency scenarios in Internet ofThings (IoT). In this paper, we develop two associated discrete time Markov chain (DTMC) models to analyze performance of the PPT in an IoT network. Using the proposed DTMC models, we investigate the effect of traffic prioritization interms of average packet delay for a synchronous medium access control (MAC) protocol. Furthermore, the results obtained from analytical models are validated via discrete-event simulations. Numerical results prove the accuracy of the models and reveal the behavior of priority based packet transmissions.

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