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  • 1651.
    Vinel, Alexey
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Ma, Xiaomin
    Oral Roberts University, Tulsa, OK, USA.
    Huang, Dijiang
    Arizona State University, Tempe, AZ, USA.
    Guest Editors’ Introduction: Special Issue on Reliable and Secure VANETs2016Inngår i: IEEE Transactions on Dependable and Secure Computing, ISSN 1545-5971, E-ISSN 1941-0018, Vol. 13, nr 1, s. 2-4Artikkel i tidsskrift (Fagfellevurdert)
  • 1652.
    Vinel, Alexey
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Pettersson, Henrik
    Scania, Södertälje, Sweden.
    Lin, Lan
    Hitachi, Sophia Antipolis, France.
    Altintas, Onur
    Toyota, Tokyo, Japan.
    Gusikhin, Oleg
    Ford Research & Adv. Engineering, Dearborn, MI, United States.
    Vehicular networking for autonomous driving: [Guest Editorial]2015Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, nr 12, s. 62-63Artikkel i tidsskrift (Fagfellevurdert)
  • 1653.
    Viteckova, Slavka
    et al.
    Faculty of Biomedical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
    Khandelwal, Siddhartha
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Kutilek, Patrik
    Faculty of Biomedical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
    Krupicka, Radim
    Faculty of Biomedical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
    Szabo, Zoltan
    Faculty of Biomedical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
    Gait symmetry methods: Comparison of waveform-based Methods and recommendation for use2020Inngår i: Biomedical Signal Processing and Control, ISSN 1746-8094, E-ISSN 1746-8108, Vol. 55, artikkel-id 101643Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gait symmetry has been shown to be a relevant measure for differentiating between normal and pathological gait. Although a number of symmetry methods exist, it is not clear which of these methods should be used as they have been developed using data collected from varying experimental protocols. This paper presents a comparison of state-of-the-art waveform-based symmetry methods and tests them on walking data collected from different environments. Acceleration signals collected from the ankle are used to analyse symmetry methods under different signal circumstances, such as phase shift, waveform shape difference, signal length (i.e. number of gait cycles) and gait initiation phase. The cyclogram based method is invariant to signal phase shifts, signal length and the gait initiation phase. The trend symmetry method is not affected by signal scaling and the gait initiation phase but is affected by signal length depending on the environment. Similar to the trend method, the cross-correlation symmetry method is not responsive to signal scaling and the gait initiation phase. The results of the symbolic method are not influenced by signal scaling, gait initiation and depending on the environment by the signal phase shift. From the results of the performed analysis, we recommend the trend method to gait symmetry assessment. The comparison of waveform-based symmetry methods brings new knowledge that will help in selecting an appropriate method for gait symmetry assessment under different experimental protocols. © 2019 Elsevier Ltd. All rights reserved.

  • 1654.
    Voronov, Alexey
    et al.
    Viktoria Swedish ICT, Gothenburg, Sweden.
    Englund, Cristofer
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab). Viktoria Swedish ICT, Gothenburg, Sweden.
    Bengtsson, Hoai
    Viktoria Swedish ICT, Gothenburg, Sweden.
    Chen, Lei
    Viktoria Swedish ICT, Gothenburg, Sweden.
    Ploeg, Jeroen
    TNO, Helmond, The Netherlands.
    de Jongh, Jan
    TNO, Helmond, The Netherlands.
    van de Sluis, Jacco
    TNO, Helmond, The Netherlands.
    Interactive test tool for interoperable C-ITS development2015Inngår i: 2015 IEEE 18th International Conference on Intelligent Transportation Systems / [ed] Lisa O’Conner, Los Alamitos: IEEE, 2015, s. 1713-1718, artikkel-id 7313370Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the architecture of an Interactive Test Tool (ITT) for interoperability testing of Cooperative Intelligent Transport Systems (C-ITS). Cooperative systems are developed by different manufacturers at different locations, which makes interoperability testing a tedious task. Up until now, interoperability testing is performed during physical meetings where the C-ITS devices are placed within range of wireless communication, and messages are exchanged. The ITT allows distributed (e.g. over the Internet) interoperability testing starting from the network Transport Layer and all the way up to the Application Layer, e.g. to platooning. ITT clients can be implemented as Hardware-in-the-Loop, thus allowing to combine physical and virtual vehicles. Since the ITT considers each client as a black box, manufacturers can test together without revealing internal implementations to each other. The architecture of the ITT allows users to easily switch between physical wireless networking and virtual ITT networking. Therefore, only one implementation of the ITS communication stack is required for both development and testing. This reduces the work overhead and ensures that the stack that is used during the testing is the one deployed in the real world. © 2015 IEEE.

  • 1655.
    Wang, Bin
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Jonsson, Magnus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Fan, Xing
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Analysis of Efficient TDMA Schedules via the Fat-Tree Network with Real-Time Many-to-Many Communication2006Inngår i: Proceedings of the IASTED International Conference on Parallel and Distributed Computing and Networks: as part of the 24th IASTED International Multi-Conference on Applied Informatics : February 14-16, 2006, Innsbruck, Austria, Anaheim, CA: ACTA Press, 2006, s. 192-197Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Real-Time Many-to-Many (RTM2M) communication pattern is widely used in many parallel and distributed computing applications with time constraints such as radar signal processing. In this paper, we propose how to use TDMA (Time Division Multiple Access) to achieve efficient support for RTM2M over the fat-tree network built up on 4×2 switches (four children and two parents). Moreover, we have compared four different TDMA schedules in terms of the end-to-end delay and network utilization [1] and presented two of them in detail hereby. The general formulas of the end-to-end delay of two of the most interesting schedules are derived and simulations are represented to both verify the formulas and provide support for the conclusion from the viewpoint of the network utilization.

  • 1656.
    Wang, Kun
    et al.
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Du, Miao
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Sun, Yanfei
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Zhang, Yan
    University of Oslo, Oslo, Norway & Simula Research Laboratory, Fornebu, Norway.
    Attack Detection and Distributed Forensics in Machine-to-Machine Networks2016Inngår i: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 30, nr 6, s. 49-55Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The advanced idea of machine-to-machine technology has attracted a new period of network revolution, evolving into a method to monitor and control global industrial user assets, machines, and the production process. M2M networks are considered to be the intelligent connection and communication between machines. However, the security issues have been further amplified with the development of M2M networks. Consequently, it is essential to pour attention into attack detection and forensics problems in M2M networks. This article puts forward the hybrid attack detection and forensics model in M2M networks. It contains two modules: the attack detection module and the forensics analysis module. In addition, we present a distributed anti-honeypot-based forensics strategy to cope with DDoS attacks in the forensics analysis module. Finally, we also discuss some challenges in M2M network security and forensics.

  • 1657.
    Wang, Kun
    et al.
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Gu, Liqiu
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    He, Xiaoming
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Guo, Song
    Hong Kong Polytechnic University, Hong Kong, Hong Kong.
    Sun, Yanfei
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Shen, Jian
    Nanjing University of Information Science and Technology, Nanjing, China.
    Distributed Energy Management for Vehicle-to-Grid Networks2017Inngår i: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 31, nr 2, s. 22-28Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Making full use of V2G services, EVs with batteries may assist the smart grid in alleviating peaks of energy consumption. Aiming to develop a systematic understanding of the interplay between smart grid and EVs, an architecture for the V2G networks with the EV aggregator is designed to maintain the balance between energy suppliers (the grid side) and consumers (the EV side). We propose a combined control and communication approach considering distributed features and vehicle preferences in order to ensure efficient energy transfer. In our model, the integrated communication and control unit can achieve realtime and intelligent management with the logic controller and collected data. On the consumers' side, we theoretically analyze how to satisfy the charging constraints that we incorporate in the form of willingness to pay, and propose a distributed framework to coordinate the energy delivery behaviors for satisfying service demands. Moreover, illustrative results indicate that the proposed approach can yield higher revenue than the conventional pricing mechanism in V2G networks.

  • 1658.
    Wang, Kun
    et al.
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Wang, Yunqi
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Hu, Xiaoxuan
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Sun, Yanfei
    Nanjing University of Posts and Telecommunications, Nanjing, China.
    Deng, Der-Jiunn
    National Changhua University of Education, Changhua City, Taiwan.
    Vinel, Alexey
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Zhang, Yan
    University of Oslo, Oslo, Norway & Simula Research Laboratory, Fornebu, Norway.
    Wireless Big Data Computing in Smart Grid2017Inngår i: IEEE wireless communications, ISSN 1536-1284, E-ISSN 1558-0687, Vol. 24, nr 2, s. 58-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The development of smart grid brings great improvement in the efficiency, reliability, and economics to power grid. However, at the same time, the volume and complexity of data in the grid explode. To address this challenge, big data technology is a strong candidate for the analysis and processing of smart grid data. In this article, we propose a big data computing architecture for smart grid analytics, which involves data resources, transmission, storage, and analysis. In order to enable big data computing in smart grid, a communication architecture is then described consisting of four main domains. Key technologies to enable big-data-aware wireless communication for smart grid are investigated. As a case study of the proposed architecture, we introduce a big-data- enabled storage planning scheme based on wireless big data computing. A hybrid approach is adopted for the optimization including GA for storage planning and a game theoretic inner optimization for daily energy scheduling. Simulation results indicate that the proposed storage planning scheme greatly reduce.

  • 1659.
    Wang, Qin
    et al.
    Acreo ICT AB, Kista, Sweden.
    Jafari, Mehrdad
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab).
    Hussein, Laiq
    Solid State Physics and the Nanometer Structure Consortium, Lund University, Lund, Sweden.
    Song, Jindong
    Center for Optoelectronic Convergence Systems, KIST (Korean Institute of Science and Technology), Seoul, South Korea.
    Choi, Won Jun
    Center for Optoelectronic Convergence Systems, KIST (Korean Institute of Science and Technology), Seoul, South Korea.
    Han, Il Ki
    Center for Optoelectronic Convergence Systems, KIST (Korean Institute of Science and Technology), Seoul, South Korea.
    Lee, Eun Hye
    Center for Optoelectronic Convergence Systems, KIST (Korean Institute of Science and Technology), Seoul, South Korea.
    Park, Suk In
    Center for Optoelectronic Convergence Systems, KIST (Korean Institute of Science and Technology), Seoul, South Korea.
    Lim, Ju Young
    Laser-IT Center, Korea Photonics Technology Institute, Seoul, South Korea.
    Karim, Amir
    Acreo ICT AB, Kista, Sweden.
    Andersson, Jan Y.
    Acreo ICT AB, Kista, Sweden.
    Pettersson, Håkan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab).
    MWIR interband transitions in type-II (III) In(GaAl)Sb quantum dots2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this work we present an alternative approach for realizing desired IR devices with appropriate operating wavelengths in the MWIR region utilizing In(GaAl)Sb quantum dots embedded in an InAs matrix grown by MBE. The QDs exhibit spatially indirect interband transitions in a type-II broken bandgap alignment, with a transition energy that can be tuned by bandgap and strain engineering utilizing either the quantum dot size or the incorporation of Ga or (GaAl) into the QDs. Furthermore, the growth of such QDs does not require sophisticated epitaxial designs needed for superlattices or quantum cascade structures regarding large numbers of alternating layers and very exact interfaces. The QD structures are expected to exhibit key advantages for IR devices e.g. higher operating temperature, lower power consumption, size, weight, and cost. The structural and composition properties of designed and grown In(GaAl)Sb QDs were characterized using AFM, SEM, TEM, and XRD. The corresponding optical properties, both in terms of absorption and emission, were analyzed and compared for selected QD samples before and after annealing at 650 °C.

  • 1660.
    Wang, Rui
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Zhang, Hequn
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Larsson, Tony
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Region-based Geocast Routing Protocols for VANETs: Summary, Evaluation Methods and Simulation Models2014Inngår i: 2014 International Conference on Connected Vehicles and Expo (ICCVE), Piscataway, NJ: IEEE Press, 2014, s. 731-738, artikkel-id 7297646Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Vehicular Ad hoc Networks (VANETs) is a technology to support communication among vehicles or between vehicles and infrastructure in order to exchange traffic information and avoid accidents. Many applications in VANETs need to transmit messages to vehicles within a specific geographic region. This behaviour is called Geocast. Several Geocast routing protocols have been proposed for VANETs. In this paper, some important and representative Geocast routing protocols are summarized and theoretically compared. In order to evaluate the performance of these protocols, the evaluation methods are also defined, which include both the Packet Delivery Ratio (PDR) and the Packet Delivery Time (PDT). Additionally, some important and new models, such as the influences of city lights, and the distance between buildings potentially acting as free line of sight obstacles, are proposed to create a more realistic city environment for Geocast routing simulation. © 2014 IEEE

  • 1661.
    Wang, Xuerui
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Zhao, Li
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Navigation and Automatic Ground Mapping by Rover Robot2010Independent thesis Advanced level (degree of Master (Two Years)), 30 poäng / 45 hpOppgave
    Abstract [en]

    This project is mainly based on mosaicing of images and similarity measurements with different methods. The map of a floor is created from a database of small-images that have been captured by a camera-mounted robot scanning the wooden floor of a living room. We call this ground mapping. After the ground mapping, the robot can achieve self-positioning on the map by using novel small images it captures as it displaces on the ground. Similarity measurements based on the Schwartz inequality have been used to achieve the ground mapping, as well as to position the robot once the ground map is available. Because the natural light affects the gray value of images, this effect must be accounted for in the envisaged similarity measurements. A new approach to mosaicing is suggested. It uses the local texture orientation, instead of the original gray values, in ground mapping as well as in positioning. Additionally, we report on ground mapping results using other features, gray-values as features. The robot can find its position with few pixel errors by using the novel approach and similarity measurements based on the Schwartz inequality.

    Fulltekst (pdf)
    FULLTEXT01
  • 1662.
    Wang, Yan
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    A Domain-Specific Language for Protocol Stack Implementation in Embedded Systems2011Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Embedded network software has become increasingly interesting for both research and business as more and more networked embedded systems emerge. Well-known infrastructure protocol stacks are reimplemented on new embedded hardware and software architectures. New requirements of modern applications and devices require to implement newly designed or revised protocols. However, implementing protocol stacks for embedded systems remains a time-consuming and error-prone task due to the complexity and performancecritical nature of network software. It is even more so when targeting resource constrained embedded systems: implementations have to minimize energy consumption, memory usage etc., while programming efficiency is needed to improve on time-to-market, scalability, maintainability and product evolution. Therefore, it is worth researching on how to make protocol stack implementations for embedded systems both easier and more likely to be correct within the resource limits.

    In the work presented in this thesis, we take a language-based approach and aim to facilitate the implementation of protocol stacks while realizing performance demands and being aware of energy consumption and memory usage within the constraints imposed by embedded systems. We give background on DSL implementation techniques, investigate common practices in network protocol development to determine the potential of domain-specifi languages (DSLs) for embedded network software, and propose a domain-specifi embedded language (DSEL), Protege (Protocol Implementation Generator), for declaratively describing overlaid protocol stacks. In Protege, a high-level packet specification is dually compiled into an internal data representation for protocol logic implementation, and packet processing methods which are then integrated into the dataflow framework of a protocol overlay specification. Constructs for finite state machines allow to specify protocol logic in a concise manner, close to the protocol specification style. Protege specifications are compiled to highly portable C code for various architectures.

    Four attached scientific papers report our main results in more detail: an embedded implementation of the data description calculus in Haskell, a compilation framework for generating packet processing code with overlays, the domain-specific language Protege in overview (including embedding techniques and runtime system features), and a real-world case study implementing an industrial application protocol.

    Fulltekst (pdf)
    fulltext
  • 1663.
    Wang, Yan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    A Language-Based Approach to Protocol Stack Implementation in Embedded Systems2009Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Embedded network software has become increasingly interesting for both researchand business as more and more networked embedded systems emerge.Well-known infrastructure protocol stacks are reimplemented on new emergingembedded hardware and software architectures. Also, newly designed orrevised protocols are implemented in response to new application requirements.However, implementing protocol stacks for embedded systems remains a timeconsumingand error-prone task due to the complexity and performance-criticalnature of network software. It is even more so when targeting resource constrainedembedded systems: implementations have to minimize energy consumption,memory usage and so on, while programming efficiency is needed toimprove on time-to-market, scalability, maintainability and product evolution.Therefore, it is worth researching on how to make protocol stack implementationsfor embedded systems both easier and more likely to be correct withinthe resource limits.In the work we present in this thesis, we take a language-based approachand aim to facilitate the implementation of protocol stacks while realizingperformance demands and keeping energy consumption and memory usagewithin the constraints imposed by embedded systems. Language technologyin the form of a type system, a runtime system and compiler transformationscan then be used to generate efficient implementations. We define a domainspecificembedded language (DSEL), Implementation of Protocol Stacks (IPS),for declaratively describing overlaid protocol stacks. In IPS, a high-level packetspecification is dually compiled into an internal data representation for protocollogic implementation, and packet processing methods which are thenintegrated into the dataflow framework of a protocol overlay specification.IPS then generates highly portable C code for various architectures from thissource. We present the compilation framework for generating packet processingand protocol logic code, and a preliminary evaluation of our compiled code.

    Fulltekst (pdf)
    FULLTEXT01
  • 1664.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    A Compositional Implementation of Modbus in Protege2011Inngår i: 6th IEEE International Symposium on Industrial Embedded Systems (SIES), 2011, Piscataway, N.J.: IEEE Press, 2011, s. 123-131Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Network protocols today play a major role in embedded software for industrial automation, with constant efforts to adapt existing device software to new emerging standards. In earlier work, we have proposed a compilation-based approach using a domain-specific language, Protege, which automatically generates protocol stack implementations in C from modular high-level descriptions. In this paper, we provide a case study of the Protege language in an industrial setting. We have implemented the Modbus protocol over TCP/IP and over serial line, and tested it using an industrial gateway. Our implementation demonstrates Protege's advantages for software productivity, easy maintenance and code reuse, and it achieves many desirable properties of industrial embedded network software.

  • 1665.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    A Domain Specific Approach to Network Software Architecture: Assuring Conformance Between Architecture and Code2009Inngår i: Fourth International Conference on Digital Telecommunications, 2009. ICDT '09, Piscataway, N.J.: IEEE Press, 2009, s. 127-132Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Network software is typically organized according toa layered architecture that is well understood. However, writingcorrect and efficient code that conforms with the architecture stillremains a problem. To overcome this problem we propose to usea domain specific language based approach. The architecturalconstraints are captured in a domain specific notation that can beused as a source for automatic program generation. Conformancewith the architecture is thus assured by construction. Knowledgefrom the domain allows us to generate efficient code. In addition,this approach enforces reuse of both code and designs, one ofthe major concerns in software architecture. In this paper, weillustrate our approach with PADDLE, a tool that generates packetprocessing code from packet descriptions. To describe packets weuse a domain specific language of dependent types that includespacket overlays. From the description we generate C librariesfor packet processing that are easy to integrate with other partsof the code. We include an evaluation of our tool.

    Fulltekst (pdf)
    FULLTEXT01
  • 1666.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    A Domain-Specific Language Approach to Protocol Stack Implementation2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes a domain-specific language embeddedin Haskell, IPS, for the implementation of protocol stacks for embeddedsystems. IPS profits from Haskell’s features and generates C implementationsby embedded compilation.

  • 1667.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    A Library for Processing Ad hoc Data in Haskell: Embedding a Data Description Language2011Inngår i: Implementation and application of functional languages / [ed] Scholz, SB; Chitil, O, Springer, 2011, , s. 16s. 174-191Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Ad hoc data formats, i.e. semistructured non-standard dataformats, are pervasive in many domains that need software tools—bioinformatics,demographic surveys, geophysics and network software are justa few. Building tools becomes easier if parsing and other standard inputoutputprocessing can be automated. Modern approaches for dealingwith ad hoc data formats consist of domain specific languages based ontype systems. Compilers for these languages generate data structures andparsing functions in a target programming language in which tools andapplications are then written. We present a monadic library in Haskellthat implements a data description language. Using our library, Haskellprogrammers have access to data description primitives that can be usedfor parsing and that can be integrated with other libraries and applicationprograms without the need of yet another compiler.

    Download (pdf)
    SUMMARY01
  • 1668.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    An embedded language for programming protocol stacks in embedded systems2011Inngår i: PEPM '11: proceedings of the 20th ACM SIGPLAN Workshop on Partial Evaluation and Semantics-Based Program Manipulation, January 24, 2011, Austin, Texas, USA, New York, NY, USA: ACM Press, 2011, s. 63-72Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Protocol stack specifications are well-structured documents that follow a number of conventions and notations that have proven very useful for the design and dissemination of communication protocols. Protocol stack implementations on the other hand, are done in low-level languages, using error-prone programming techniques resulting in programs that are difficult to relate to the specifications, difficult to maintain, modify, extend and reuse. To overcome these problems we propose a domain-specific language that provides abstractions close to the notations used in protocol specifications. From descriptions in our language we generate C programs that can be integrated with other systems software. The language provides constructs to describe packet formats, including physical layout, constraints and dependencies. It also provides constructs for state machines and for layering protocols into stacks. Experiments show that the C programs we generate are comparable in performance and binary size to hand-crafted C programs.

  • 1669.
    Wang, Yan
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Gaspes, Veronica
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Integrating a data description language with protocol stack development2009Inngår i: Proceedings of the IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009 / [ed] H. Ma and S. Narayanan, Anaheim, Calif.: ACTA Press, 2009, s. 8-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Communication software, most notoriously protocolstacks, are an area of growing interest. Many companiesimplement new or revised protocols for new applicationrequirements, and reimplement well-known infrastructureprotocol stacks to accomodate to new hardware andsoftware platforms. However, due to the complexity andperformance-critical nature of communication software,implementing protocol stacks remains a time-consumingand error-prone task with considerable impact on time tomarket, scalability and maintainance. The work at handinvestigates how to provide program development supportfor protocol stack implementation to make it easier andmore likely to be correct while respecting non-functionalconstraints. We present a language-based approach for theimplementation of protocol stacks. We define a domainspecificembedded language, IPS, for declaratively describingoverlaid protocol stacks. In IPS a high-level packetspecification is described using a data description languagewhich is compiled into a.) an internal data representation,and b.) packet processing functions in C. Both are then integratedinto the dataflow framework of a protocol overlayspecification. IPS generates highly portable C code for variousarchitectures from this source. We present the compilationframework for generating packet processing andprotocol logic code, and a preliminary evaluation.

    Fulltekst (pdf)
    FULLTEXT01
  • 1670.
    Wecksten, Mattias
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    RealLife - en tekniköversikt2008Rapport (Annet vitenskapelig)
    Abstract [sv]

    RealLife är en sammankopplink mellan användarens plattform och tjänsteleverantörer via en central databas. Tanken är att en individidentifierare, UBI passport, ska vara kärnan i systemet som möjliggör att flytta innehåll från plattform till plattform. Genom att ta kontroll över den databas som samlar allt material och alla tjänster får man möjlighet att sälja extremfokuserad reklam. All den teknik som krävs för att genomföra projektet RealLife finns tillgänglig i någon form redan idag. Avgörande blir om man lyckas att göra så att användaren känner någon nytta utöver vad man skulle ha fått från en traditionell söktjänst. Detta kräver articifiell intelligens utöver vad som är tillgängligt idag.

    Fulltekst (pdf)
    FULLTEXT01
  • 1671.
    Wecksten, Mattias
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Är du beredd? – för nu snor någon dina företagshemligheter!2008Inngår i: Hallands Affärer, nr 3, s. 1-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Populärvetenskapligt brandtal om nyttan och behovet av välutbildade nätverkstekniker med perspektiv på såväl teknik som juridik.

  • 1672.
    Wecksten, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Less pessimistic worst-case delay analysis for packet-switched networks2008Inngår i: IEEE International Conference on Emerging Technologies and Factory Automation, 2008. ETFA 2008, Piscataway, N.J.: IEEE Press, 2008, s. 1213-1219Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The rapid growth of distributed real-time systems creates a need for cheap and available network solutions while still fulfilling the real-time requirements. In this paper we propose a method for less pessimistic delay analysis for packet switched first come first serve network, when knowing the intervals of possible message generation. Experiments show that the proposed method generates the expected results according to theoretical limitations of the experiment cases. The experiments also show that the proposed method could be practically used for non-trivial systems. Suggestions are given for future work on how to relax traffic requirements and how to cope with circular dependencies.

    Fulltekst (pdf)
    FULLTEXT01
  • 1673.
    Wecksten, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Vasell, Jonas
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Towards a tool for derivation of implementation constraints2004Inngår i: Ninth IEEE International Conference on Engineering Complex Computer Systems, 2004. Proceedings, Piscataway, N.J.: IEEE , 2004, s. 119-127Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An increasing concern in the development of embedded systems is that fundamental design problems often remain undetected until the final tests, after implementation and integration of all components, or maybe even later - at runtime. This is particularly important when it comes to meeting nonfunctional constraints such as performance or resource utilization requirements. Correcting problems with their sources in design, after implementation, may be very costly as it often requires both redesign and re-implementation. Therefore, much effort has been put into the development of methods and tools that help system designers and developers to detect problems as early as possible during system development. This paper contributes with an addition to that field by presenting and evaluating the practical usefulness of a method that makes it possible to detect problems in system design and dimensioning, even before all components of the system have been fully implemented. Evaluation of the proposed method has been done through 17 different case studies with different characteristics, focusing particularly on realtime latency requirements for tasks on homogeneous single bus platforms. The evaluation indicates a practical method that can be turned into a powerful tool. The presented principles can be extended to wider classes of constraints and systems.

    Fulltekst (pdf)
    FULLTEXT01
  • 1674.
    Weckstén, Mattias
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Frick, Jan
    Högskolan i Halmstad.
    Sjostrom, Andreas
    Högskolan i Halmstad.
    Järpe, Eric
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    A Novel Method for Recovery from Crypto Ransomware Infections2016Inngår i: 2016 2nd IEEE International Conference on Computer and Communications, ICCC 2016 - Proceedings, New York: IEEE, 2016, s. 1354-1358Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Extortion using digital platforms is an increasing form of crime. A commonly seen problem is extortion in the form of an infection of a Crypto Ransomware that encrypts the files of the target and demands a ransom to recover the locked data. By analyzing the four most common Crypto Ransomwares, at writing, a clear vulnerability is identified; all infections rely on tools available on the target system to be able to prevent a simple recovery after the attack has been detected. By renaming the system tool that handles shadow copies it is possible to recover from infections from all four of the most common Crypto Ransomwares. The solution is packaged in a single, easy to use script. © 2016 IEEE.

  • 1675.
    Weckstén, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Vasell, J.
    Generic Systems Sweden AB.
    Derivation of implementation constraints - implementation simulation and treatment of multiple design choices2005Inngår i: Proceedings: 10th IEEE International Conference on Engineering of Complex Computer Systems, ICECCS 2005, 16-20 June 2005, Shanghai, China, Los Alamitos, Calif.: IEEE Computer Society, 2005, s. 459-466Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The industrial use of ad hoc implementation methods for non-functional constrained tasks has resulted in unnecessary expensive projects. In some cases, ad hoc methods result in overly many iterations to be made and in some severe cases, total project breakdown. To be able to solve these problems a method has been developed to derive end-to-end non-functional constraints, such as timing requirements, to task-level constraints and to promote this information to the implementation phase of the project. For a tool, as the one described above, to be really useful it is important to be able to show that there is a potential cost reduction to be made. To be able to show that a certain implementation method costs less in work hours than to use an ad hoc implementation method, a model for implementation simulation with support for multiple implementation alternatives has been developed. The experiments show that using the budget based implementation method leads to a significant cost reduction in most cases, compared to the ad hoc method. As far as we know, no similar experiments have been done to compare implementation methods.

    Fulltekst (pdf)
    FULLTEXT01
  • 1676.
    Weckstén, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Vasell, Jonas
    Generic Systems Sweden AB, Stockholm, Sweden.
    Derivation of implementation constraints – implementation simulation and treatment of multiple design choices2007Inngår i: Proc. of the 9th biennial SNART Conference on Real-Time Systems (Real-Time in Sweden – RTiS’07), Västerås, Sweden, Aug. 21-22, 2007, s. 21-28Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The industrial use of ad hoc implementation methods for non-functional constrained tasks has resulted in unnecessary expensive projects. In some cases, ad hoc methods result in overly many iterations to be made and in some severe cases, total project breakdown. To be able to solve these problems a method has been developed to derive end-to-end non-functional constraints, such as timing requirements, to task-level constraints and to promote this information to the implementation phase of the project. For a tool, as the one described above, to be really useful it is important to be able to show that there is a potential cost reduction to be made. To be able to show that a certain implementation method costs less in work hours than to use an ad hoc implementation method, a model for implementation simulation with support for multiple implementation alternatives has been developed. The experiments show that using the budget based implementation method leads to a significant cost reduction in most cases, compared to the ad hoc method. As far as we know, no similar experiments has been done to compare implementation methods.

    Fulltekst (pdf)
    fulltext
  • 1677.
    Weckstén, Mattias
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Vassell, Jonas
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    A tool for derivation of implementation constraints: – evaluation using implementation simulation2004Inngår i: RTSS 2004 WIP Proceedings, The 25th IEEE International Real-Time Systems Symposium, IEEE , 2004, s. 4-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The industrial use of ad hoc implementation methods for non-functional constrained tasks has sometimes resulted in unnecessary expensive projects. In some cases, ad hoc methods result in overly many iterations to be made and in some severe cases, total project breakdown. To be able to solve these problems a new method has been developed to derive end-to-end non-functional constraints, such as performance or resource utilization requirements, to task-level constraints and to promote this information to the implementation phase of the project. For a tool to be really useful it is important to be able to show the usability and potential cost reduction. To be able to show that a certain implementation method costs less in work hours than to use an ad hoc implementation method, a model for implementation simulation has been developed. As far as we know, no similar experiments has been done to compare implementation methods.

    Fulltekst (pdf)
    FULLTEXT01
  • 1678.
    Wehrmeister, Marco A.
    et al.
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Pignaton de Freitas, Edison
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Pereira, Carlos E.
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    An Infrastructure for UML-Based Code Generation Tools2009Inngår i: Analysis, architectures and modelling of embedded systems: Third IFIP TC 10 International Embedded Systems Symposium, IESS 2009, Langenargen, Germany, September 14-16, 2009, proceedings / [ed] Rettberg, A Zanella, MC Rammig, FJ, New York: Springer-Verlag New York, 2009, s. 32-43Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The use of Model-Driven Engineering (MDE) techniques in the domain of distributed embedded real-time systems are gain importance in order to cope with the increasing design complexity of such systems. This paper discusses an infrastructure created to build GenERTiCA, a flexible tool that supports a MDE approach, which uses aspect-oriented concepts to handle nonfunctional requirements from embedded and real-time systems domain. GenERTiCA generates source code from UML models, and also performs weaving of aspects, which have been specified within the UML model. Additionally, this paper discusses the Distributed Embedded Real-Time Compact Specification (DERCS), a PIM created to support UML-based code generation tools. Some heuristics to transform UML models into DERCS, which have been implemented in GenERTiCA, are also discussed.

  • 1679.
    Wehrmeister, Marco A.
    et al.
    Instituto de Informática, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Pignaton de Freitas, Edison
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES). Instituto de Informática, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Pereira, Carlos E.
    Dep. Engenharia Elétrica, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
    Using GenERTiCA to generation code from RT-UML: A case study2009Inngår i: Elsevier IFAC Publications / IFAC Proceedings series, ISSN 1474-6670, Vol. 13, nr PART 1, s. 674-679Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tool support is essential to allow the use of Model-Driven Engineering (MDE) in the design of distributed embedded real-time systems. GenERTiCA is a flexible tool that supports a MDE approach, which uses concepts of Aspect-Oriented Development (AOD) to handle non-functional requirements from real-time and embedded systems domain. This paper presents a comprehensive case study that illustrates GenERTiCA usage to generate source code from UML models. GenERTiCA also performs aspects weaving using aspect’s information specified in UML models. Results regarding source code generation for a Java platform based on the Real-Time Specification for Java (RTSJ) are presented. Additionally, this paper discusses the implementation of some aspects of a high-level aspects framework, named DERAF, using the mentioned platform. © 2009 IFAC.

  • 1680.
    Weman Josefsson, Karin
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Ebbesson, Esbjörn
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Halila, Fawzi
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Johnson, Urban
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Idrott, hälsa och fysisk aktivitet.
    Lund, Jesper
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wärnestål, Pontus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Application of self-determination theory in the e-health industry – promoting sustainable exercise motivation2015Inngår i: Proceeding: 14th European Congress of Sport Psychology: Sport Psychology: Theories and Applications for Performance, Health and Humanity: 14-19 July 2015, Bern, Switzerland / [ed] Olivier Schmid & Roland Seiler, Bern: University of Bern , 2015, s. 372-372Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Developing tailored digital interventions for exercise motivation by applying behavioral theory into existing web services in cooperation with the e-health industry could create a mutual base for experience exchange and practical implications. It could also add higher standards to e-health business by providing a scientifically sound and trustworthy foundation for digital solutions. This project aims to design an interactive tool grounded in sport and exercise psychology and combined with the latest expertise from information technology and innovation science, considering e-health industrial requirements and user needs. A main objective is to test the efficacy of using Self-Determination Theory (SDT) in designing, constructing and evaluating an exercise intervention. The digital intervention is based on a literature review mapping exercise motivation related to self-determination theory, complemented by qualitative cross-disciplinary interaction design methodologies, such as qualitative analysis of interviews and contextual observation capturing participant goals, behaviour, preferences, attitudes and frustrations. Intervention contents are essentially autonomy supportive structures, goal-setting support and relapse prevention, self-regulation structures, health information and web links. In February 2015 the intervention prototype will be pilot tested in a randomized controlled trial (RCT), involving existing members and clients (N > 10 000) of two health service companies. Outcomes relate to self-determined exercise motivation (The Basic Psychological Needs in Exercise Scale and The Behavioral Regulation in Exercise Questionnaire-2) and exercise behaviour, measured both by self-report measures (Godin Leisure-Time Exercise Questionnaire) and step counters. The RCT contains three measure points in order to allow advanced analyses of change and mechanisms based on the SDT-process model and motivational profiles. Latent growth curve and structural equation models will primarily be used to analyse data. This pilot study will create a baseline for elaboration into a second phase, were the digital tool will be further developed and longitudinally tested and evaluated over a nine months period. © 2015 University of Bern, Institut of Sport Science 

  • 1681.
    Weman Josefsson, Karin
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI). University of Gothenburg, Gothenburg, Sweden.
    Halila, Fawzi
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Johnson, Urban
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Lindwall, Magnus
    University of Gothenburg, Gothenburg, Sweden.
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wärnestål, Pontus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Digital innovations and self-determined exercise motivation: a person-centred perspective2014Inngår i: Vitalis – Nordens ledande eHälsomöte 2014: Vetenskapliga papers presenterade vid Vitalis konferens, Svenska Mässan, Göteborg, 8-10 april 2014, Göteborg: Vitalis & Sahlgrenska akademin, Göteborgs universitet , 2014, s. 22-25Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Health care costs are increasing twice as fast as wealth, making health promotion and development of cost-effective care increasingly important in order to generate sustainable health care solutions. E-health, applications and interactive tools for exercise promotion flourish; but despite this and an overflow of information regarding health benefits of regular physical activity, exercise adherence has proven to be a significant challenge. This article concerns a project aimed to design an interactive tool based on comprehensive knowledge from the field of psychology combined with expertise from information technology and innovation, based on e-health industrial requirements and user needs. The research group will, together with the expertise and infrastructure of the collaborating companies Health Profile Institute AB and Tappa Service AB, support and progress an existing PhD-project on digital interventions in exercise motivation. This will be done by designing; applying and evaluating a person-centred digital intervention prototype for exercise motivation and adherence enhancement based on Self-Determination Theory.

  • 1682.
    Weman Josefsson, Karin
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Halila, Fawzi
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Johnson, Urban
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Idrott, hälsa och fysisk aktivitet.
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wärnestål, Pontus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Digital interventions in self-determined exercise motivation – interdisciplinary innovations2015Inngår i: ISBNPA 2015: Advancing Behavior Change Science : 3rd – 6th June 2015: Abstract Book, 2015, s. 592-592Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Purpose:There is a need for scientifically sound and theory based tools and services in e-health. In this project knowledge from the field of psychology will be complemented by expertise in information technology and innovation science in designing a digital intervention based on Self-determination theory (SDT) aiming to facilitate exercise motivation.

    Methods:The intervention will be tested by a three wave RCT design in a population of e-health clients (n = 200) in a web based exercise service. Sensors (step counters) and self-reports (Godin Leisure-Time Exercise Questionnaire) will be used to measure objective and subjective exercise behavior while instruments based on SDT (Basic Psychological Needs in Exercise Scale and Behavioral Regulation in Exercise Questionnaire-2 ) will measure factors related to motivation.  Advanced mediation variable analyses (MVA) and latent growth curve models (LGCM) will be used to explore motivational processes, changes and profiles in relation to exercise behavior.

    Expected Results:Based on the SDT process model, it is hypothesized that a (digital) environment supporting basic psychological need satisfaction will facilitate internalization and enhanced self-determined motivation, which in turn will have a positive effect on exercise behavior.

    Conclusions:Clarifying mechanisms and indirect effects provide knowledge of how intervention effects could be interpreted and understood. Combining high level research design like RCT and advanced analyses as MVA provides valuable contributions to the understanding of theoretical mechanisms of motivation that could inform the tailoring of effective interventions promoting healthy exercise behaviours.  In addition, the project might form a prosperous interdisciplinary fusion generating innovative and theory based digital solutions for e-health.

  • 1683.
    Weman-Josefsson, Karin Anna
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Idrott, hälsa och fysisk aktivitet. University of Gothenburg, Gothenburg, Sweden.
    Halila, Fawzi
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Johnson, Urban
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Idrott, hälsa och fysisk aktivitet.
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    Wärnestål, Pontus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Digital Innovations and Self-determined exercise motivation: an interdisciplinary approach2015Inngår i: Proceedings of The 6th International Multi-Conference on Complexity, Informatics and Cybernetics: IMCIC March 2015. Orlando, Florida., 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In face of escalating health care costs, new technology holds great promise for innovative solutions and new, more sustainable health care models. Technology centers around the individual, allowing for greater autonomy and control in health issues and access to tailored information and customized health behavior interventions. While this offers good opportunities for both public health impact and improved well-being at individual levels, it also emphasizes the need for properly designed e-health models firmly based on scientific principles and adequate theoretical frameworks. Consequently, this project aims to design an interactive tool utilizing an interdisciplinary approach combining motivational theory with the fields of information technology and business model innovation. In collaboration with two companies from the e-health industry, the purpose is to design, apply and evaluate a person-centered interactive prototype for maintainable and self-determined exercise motivation.

    Fulltekst (pdf)
    fulltext
  • 1684.
    Weman-Josefsson, Karin
    et al.
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Wärnestål, Pontus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Johnson, Urban
    Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI).
    Halila, Fawzi
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL).
    Wickström, Nicholas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR Centrum för tillämpade intelligenta system (IS-lab).
    An interdisciplinary project plan on Digital Innovations and Self-determined Exercise Motivation2013Konferansepaper (Annet vitenskapelig)
  • 1685.
    Wiberg, Per-Arne
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Graphical programming of time-deterministic real-time systems1996Inngår i: Second IEEE International Conference on Engineering of Complex Computer Systems: Held jointly with 6th CSESAW, 4th IEEE RTAW, and SES'96, Montréal, Québec, Canada, October 21-25, 1996, Los Alamitos, Calif.: IEEE Computer Society, 1996, s. 173-180Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In this paper we present the Picasso programming language and the underlying design philosophy. Our goal is to provide programmers working with distributed embedded real-time systems with a tool to manage the complexity of this class of systems. The proposed tool allows easy and safe changes of the system software and hardware at any time during the lifetime of the system. This means that even during operation the system can be changed safely. This is not only important for enhancing the design process but is also necessary for a class of systems that need to be in service at all times. We have chosen to call this approach Change-Orientation. The most characteristic properties of the language are that it is graphical and that it shows time explicitly. All processing is described as functional transformations. These transformations are called processes. A very direct way of implementing a process is possible because the semantics of the description maps directly on the computation model of the processor.

  • 1686.
    Wiberg, Per-Arne
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS). Free2move AB.
    Bilstrup, Urban
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS). Free2move AB.
    Wireless Technology in Industry – Applications and User Scenarios2001Inngår i: 2001 8th IEEE International Conference on Emerging Technologies and Factory Automation: Proceedings: ETFA 2001, October 15-18, 2001, Antibes-Juan les Pins, France, vol. 1, Piscataway, NJ: IEEE Press, 2001, s. 123-131Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we draw a map of the wireless technology landscape, and place different industrial applications in this context. It is clear that in order to implement wireless communication in safety critical applications more research is needed. We describe one approach aiming at the very low bit error rates of these applications.

  • 1687.
    Wickström, Nicholas
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Byttner, Stefan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Hellring, Magnus
    Volvo Technology Corporation, Gothenburg, Sweden.
    Rögnvaldsson, Thorsteinn
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Neural networks for extracting the pressure peak position from the ion current2004Inngår i: Virtual sensing of combustion quality in SI engines using the ion current, Göteborg: Chalmers tekniska högskola , 2004, s. 95-110Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 1688.
    Wickström, Nicholas
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Laboratoriet för intelligenta system.
    Byttner, Stefan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Laboratoriet för intelligenta system.
    Holmberg, Ulf
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Laboratoriet för intelligenta system.
    Robust tuning of Individual Cylinders AFR in SI Engines with the Ion Current2005Inngår i: SAE Transactions, ISSN 0096-736X, Vol. 114, nr 03, s. 48-52Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A method for robust tuning of individual cylinders air-fuel ratio is proposed. The fuel injection is adjusted so that each cylinder has the same air-fuel ratio in inner control loops, and the resulting air-fuel ratio in the exhaust pipe is controlled with an exhaust gas oxygen sensor (EGO) in an outer control loop to achieve stoichiometric air-fuel ratio. Correction factors to provide cylinder individual fuel injection timing are calculated based on measurements of the ion currents for the individual cylinders. An implementation in a production vehicle is shown with results from driving on the highway. © 2005 SAE International.

  • 1689.
    Wickström, Nicholas
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Larsson, Magnus
    Mecel AB, Åmål, Sweden.
    Taveniku, Mikael
    Chalmers University of Technology, Göteborg, Sweden.
    Linde, Arne
    Chalmers University of Technology, Göteborg, Sweden.
    Svensson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS). Chalmers University of Technology, Göteborg, Sweden.
    Neural Virtual Sensors — Estimation of Combustion Quality in SI Engines using the Spark Plug1998Inngår i: ICANN 98: Proceedings of the 8th International Conference on Artificial Neural Networks, Skövde, Sweden, 2-4 September 1998 / [ed] Lars Niklasson, Mikael Bodén, Tom Ziemke, London: Springer , 1998, s. 215-220Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose two virtual sensors which estimate the location of the pressure peak and the air-fuel ratio from measurements of the ionization current across the spark plug gap.

    The location of pressure peak virtual sensor produces estimates on a cycle-by-cycle basis for each of the cylinders. These estimates are twice as good as estimates obtained from a linear model.

    The air-fuel ratio virtual sensor uses the universal exhaust gas oxygen sensor as reference; it produces estimates that are ten times better than estimates obtained from a linear model.

  • 1690.
    Wikhamn, Björn Remneland
    et al.
    Department of Business Administration, School of Business, Economics and Law, University of Gothenburg, Sweden.
    Ljungberg, Jan
    Department of Applied IT, University of Gothenburg, Sweden.
    Rolandsson, Bertil
    Department for Sociology and Work Science, University of Gothenburg, Sweden.
    Bergquist, Magnus
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Given enough eyeballs, all crimes are shallow – The organizing of citizen collaboration to solve an online detective story2019Inngår i: Journal of Technology Management & Innovation, ISSN 0718-2724, E-ISSN 0718-2724, Vol. 14, nr 2, s. 59-68Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper theorizes about the organizing of online citizen collaboration. The setting is an Internet forum where people started their own investigations about a crime of animal cruelty. The concepts of commons-based peer production and generativity are utilized to analyse the complex organizing mechanisms of voluntaristic online collaboration in practice. Three general functions are introduced - operational, managerial, and noise - which are intertwined and together make up important basis for organizing generativity. © Universidad Alberto Hurtado, Facultad de Economía y Negocios.

  • 1691.
    Wiklund, Daniel
    et al.
    Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola.
    Nilsson, Larsgunnar
    Nilsson, Bertil
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
    Andersson, Alf
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Gunnarsson, Lars
    On the Implementation and Evaluation of a Roughness Based Friction Model in FE Simulations of Sheet Metal Forming2006Inngår i: Proceedings of The 12th Nordic Symposium on Tribology, Lyngby: DTU Mechanical Engineering , 2006Konferansepaper (Fagfellevurdert)
  • 1692.
    Wildevuur, Sabine
    et al.
    Waag Society, Amsterdam, The Netherlands.
    van Dijk, Dick
    Waag Society, Amsterdam, The Netherlands.
    Hammer-Jakobsen, Thomas
    Copenhagen Living Lab, Valby, Denmark.
    Bjerre, Mie
    Copenhagen Living Lab, Valby, Denmark.
    Äyväri, Anne
    Laurea University of Applied Science, Porvoo, Finland.
    Lund, Jesper
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Människa och Informationsteknologi (MI-lab).
    Connect: Design for an Empathic Society2013Bok (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    The prospects are clear: we will probably live longer. The number of people aged 65 and up will increase enormously over the next few decades. Society will change as a result, but in what manner?

    Europe - and, in fact, probably the world - faces the challenge of preventing loneliness and isolation amongst a growing group of senior people. The oldest part of the population is at particular risk of becoming isolated and lonely as they grow older and their work-related networks erode. While working in the field of technology and aging, the authors discovered that there is a whole new field to be explored, namely the phenomenon of connectedness.

    This book is written by a group of authors with very different backgrounds, varying from business, ICT, marketing, anthropology, medicine, design and computer interaction. They all felt the urge to explore this field of connectedness and they discovered new opportunities for the emerging market of ‘aging-driven design’.

    By unfolding the very nature of relationships and age-based transitions in life, the authors invite the reader to join them in an effort to design for connectedness: to reframe the picture, rethink our options and reinvent how to connect!

  • 1693.
    Willa, K.
    et al.
    Argonne National Laboratory, Argonne, Illinois, USA.
    Diao, Zhu
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab). Stockholm University, Stockholm, Sweden.
    Campanini, D.
    Stockholm University, Stockholm, Sweden.
    Welp, U.
    Argonne National Laboratory, Argonne, Illinois, USA.
    Divan, R.
    Argonne National Laboratory, Argonne, Illinois, USA.
    Hudl, M.
    Stockholm University, Stockholm, Sweden.
    Islam, Z.
    Argonne National Laboratory, Argonne, Illinois, USA.
    Kwok, W.-K.
    Argonne National Laboratory, Argonne, Illinois, USA.
    Rydh, A.
    Stockholm University, Stockholm, Sweden.
    Nanocalorimeter platform for in situ specific heat measurements and x-ray diffraction at low temperature2017Inngår i: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 88, nr 12, artikkel-id 125108Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Recent advances in electronics and nanofabrication have enabled membrane-based nanocalorimetry for measurements of the specific heat of microgram-sized samples. We have integrated a nanocalorimeter platform into a 4.5 T split-pair vertical-field magnet to allow for the simultaneous measurement of the specific heat and x-ray scattering in magnetic fields and at temperatures as low as 4 K. This multi-modal approach empowers researchers to directly correlate scattering experiments with insights from thermodynamic properties including structural, electronic, orbital, and magnetic phase transitions. The use of a nanocalorimeter sample platform enables numerous technical advantages: precise measurement and control of the sample temperature, quantification of beam heating effects, fast and precise positioning of the sample in the x-ray beam, and fast acquisition of x-ray scans over a wide temperature range without the need for time-consuming re-centering and re-alignment. Furthermore, on an YBa2Cu3O7−δ crystal and a copper foil, we demonstrate a novel approach to x-ray absorption spectroscopy by monitoring the change in sample temperature as a function of incident photon energy. Finally, we illustrate the new insights that can be gained from in situ structural and thermodynamic measurements by investigating the superheated state occurring at the first-order magneto-elastic phase transition of Fe2P, a material that is of interest for magnetocaloric applications. © 2017 Author(s).

  • 1694.
    Willander, Magnus
    et al.
    Linköping University, Linköping, Sweden.
    Pettersson, Håkan
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab).
    Preface2017Inngår i: International Journal of High Speed Electronics and Systems, ISSN 0129-1564, Vol. 26, nr 1-2, artikkel-id 1702001Artikkel i tidsskrift (Fagfellevurdert)
  • 1695.
    Willander, Magnus
    et al.
    Linköping University, Linköping, Sweden.
    Pettersson, HåkanHögskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Tillämpad matematik och fysik (MPE-lab).
    Special Issue on Scaling and Integration of High Speed Electronics and Optomechanical Systems2017Konferanseproceedings (Fagfellevurdert)
  • 1696.
    Willig, Andreas
    et al.
    Department of Computer Science and Software Engineering, University of Canterbury, Christchurch, New Zealand.
    Uhlemann, Elisabeth
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Deadline-Aware Scheduling of Cooperative Relayers in TDMA-Based Wireless Industrial Networks2014Inngår i: Wireless networks, ISSN 1022-0038, E-ISSN 1572-8196, Vol. 20, nr 1, s. 73-88Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we consider a scenario in which a set of source nodes wishes to transmit real-time data packets periodically to a central controller over lossy wireless links, while using a TDMA-based medium access control protocol. Furthermore, a number of relay nodes are present which can help the source nodes with packet retransmissions. The key question we consider in this paper is how to schedule the TDMA slots for retransmissions while taking advantage of the relay nodes, so that the average number of packets missing their deadlines is minimized. We provide a problem formulation for the general deadline-aware TDMA relay scheduling problem. Since the design space of the general problem is large, we also present one particular class of restricted TDMA relay scheduling problems. We suggest and numerically investigate a range of algorithms and heuristics, both optimal and suboptimal, of the restricted scheduling problem, which represent different trade-offs between achievable performance and computational complexity. Specifically, we introduce two different Markov Decision Process (MDP) based formulations for schedule computation of the restricted TDMA relay scheduling problem. One MDP formulation gives an optimal schedule, another (approximate) formulation gives a sub-optimal schedule which, however, comes very close to the optimal performance at much more modest computational and memory costs. © 2013 Springer Science+Business Media New York.

  • 1697.
    Willig, Andreas
    et al.
    University of Canterbury, Christchurch, New Zealand.
    Uhlemann, Elisabeth
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    On relaying for wireless industrial communications: Is careful placement of relayers strictly necessary?2012Inngår i: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS, Piscataway, NJ: IEEE Press, 2012, s. 191-200, artikkel-id 6242567Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Relaying is a very promising technique to improve the reliability of data transmission in wireless (industrial) networks. With relaying, relay nodes support source nodes in carrying out retransmissions. A common assumption is that relayers should be placed at “good” positions (e.g. in the middle between source and destination) to achieve benefits. In this paper we tackle the question of whether it is strictly necessary to place relayers at “good” positions (which often requires extensive measurements). We present results indicating that the benefits of relaying are achievable even with randomly placed relayers, as long as enough of them are deployed. Specifically, we present results suggesting that with a sufficient (and still not too high) number of randomly deployed relayers, the probability that all packets, sent by source nodes to a central controller in a TDMA round, reach the controller is larger than for the case with source-only retransmissions. This finding holds true both in the absence and the presence of feedback. © 2012 IEEE.

    Fulltekst (pdf)
    WilUhlWFCS12
  • 1698.
    Willig, Andreas
    et al.
    Technische Universitt Berlin, Berlin, Germany.
    Uhlemann, Elisabeth
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    PRIOREL-COMB: A protocol framework supporting relaying and packet combining forwireless industrial networking2008Inngår i: WFCS 2008: 2008 IEEE International Workshop on Factory Communication Systems : proceedings : May 21st-23rd, 2008, Steigenberger Hotel de Saxe, Dresden, Germany / [ed] Gianluca Cena and Françoise Simonot-Lion, Piscataway, NJ: IEEE Press, 2008, s. 45-54Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The PRIOREL-COMB framework presented here integrates support for relaying and packet combining into wireless industrial networks. The selection of suitable relay nodes is made using distributed algorithms which includes different eligibility tests as well as different priority assignments. The framework improves performance in terms of probability to successfully deliver packets before their deadline and it can be implemented on top of commercial transceivers without modification of the physical layer. This class of protocols will therefore be a valuable addition to future wireless industrial communication systems.

    Fulltekst (pdf)
    FULLTEXT01
  • 1699.
    Wolkerstorfer, M.
    et al.
    FTW, Österrike.
    Nordström, Tomas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Coverage Optimization in DSL Networks by Low-Complexity Discrete Spectrum Balancing2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Spectrum balancing is an established optimization approach in multi-carrier digital subscriber line (DSL) systems. It has previously been applied to very different performance objectives such as sum-rate, min-rate, or fairness maximization and sum-power minimization. In this work we study the maximization of the service coverage, which will be defined as the number of DSL lines which can be granted an operator-specified high-bandwidth service. The proposed algorithm is based on a previously described mathematical decomposition framework. We extend this framework for our new problem and enhance its scalability by various low-complexity heuristics. Simulations demonstrate the applicability of our algorithm for DSL networks of realistic sizes. More precisely, our results obtained in thousand 25 user near-far DSL scenarios show an average gain in service coverage of more than 13% compared to state-of-the-art sum-rate maximizing spectrum balancing algorithms. © 2011 IEEE.

  • 1700.
    Wolkerstorfer, Martin
    et al.
    FTW Telecommunications Research Center Vienna, Vienna, Austria.
    Jaldén, Joakim
    ACCESS Linnaeus Center, Signal Processing Lab, KTH Royal Institute of Technology, Stockholm, Sweden.
    Nordström, Tomas
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES). FTW Telecommunications Research Center Vienna, Vienna, Austria.
    Column Generation for Discrete-Rate Multi-User and Multi-Carrier Power Control2012Inngår i: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 60, nr 9, s. 2712-2722Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We consider a constrained multi-carrier power allocation problem in interference-limited multi-user systems with a finite set of transmission rates. The Lagrange relaxation is a common technique for decomposing such problems into independently solvable per-subcarrier problems. Deviating from this approach our main contribution is the proposal of a novel spectrum management framework based on a Nonlinear Dantzig-Wolfe problem decomposition. It allows for suboptimal initialization and suboptimal power allocation methods with low complexity. While we show that the combinatorial per-subcarrier problems have polynomial complexity in the number of users, we find that such suboptimal methods are indispensable in large systems. Thus we give an overview of various basic dual heuristics and provide simulation results on a set of thousand digital subscriber line (DSL) networks which show the superior performance of our framework compared to previous power control algorithms. © 2012 IEEE.

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