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  • 1.
    Abdelraheem, Mohammed Ahmed
    et al.
    RISE, Swedish ICT, SICS, Security Lab.
    Gehrmann, Christian
    RISE, Swedish ICT, SICS, Security Lab.
    Lindström, Malin
    Nordahl, Christian
    Executing Boolean Queries on an EncryptedBitmap Index2016Conference paper (Refereed)
    Abstract [en]

    We propose a simple and efficient searchable symmetric

    encryption scheme based on a Bitmap index that evaluates

    Boolean queries. Our scheme provides a practical

    solution in settings where communications and computations

    are very constrained as it offers a suitable tradeoff

    between privacy and performance.

  • 2.
    Abrahamsson, Henrik
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ben Abdesslem, Fehmi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ahlgren, Bengt
    RISE - Research Institutes of Sweden, ICT, SICS.
    Björkman, Mats
    Mälardalen University; Sweden.
    Brunstrom, Anna
    Karlstad University, Sweden.
    Marsh, Ian
    RISE - Research Institutes of Sweden, ICT, SICS.
    Selecting Operator in 3G/4G Networks for Time-Critical C-ITS Applications2018Conference paper (Refereed)
  • 3.
    Abrahamsson, Henrik
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ben Abdesslem, Fehmi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ahlgren, Bengt
    RISE - Research Institutes of Sweden, ICT, SICS.
    Brunstrom, Anna
    Karlstad University, Sweden.
    Marsh, Ian
    RISE - Research Institutes of Sweden, ICT, SICS.
    Björkman, Mats
    Mälardalen University, Sweden.
    Connected Vehicles in Cellular Networks: Multi-access versus Single-access Performance2018Conference paper (Refereed)
    Abstract [en]

    Connected vehicles can make roads traffic safer andmore efficient, but require the mobile networks to handle timecriticalapplications. Using the MONROE mobile broadbandmeasurement testbed we conduct a multi-access measurementstudy on buses. The objective is to understand what networkperformance connected vehicles can expect in today’s mobilenetworks, in terms of transaction times and availability. The goalis also to understand to what extent access to several operatorsin parallel can improve communication performance.In our measurement experiments we repeatedly transfer warningmessages from moving buses to a stationary server. Wetriplicate the messages and always perform three transactionsin parallel over three different cellular operators. This creates adataset with which we can compare the operators in an objectiveway and with which we can study the potential for multi-access.In this paper we use the triple-access dataset to evaluate singleaccessselection strategies, where one operator is chosen for eachtransaction. We show that if we have access to three operatorsand for each transaction choose the operator with best accesstechnology and best signal quality then we can significantlyimprove availability and transaction times compared to theindividual operators. The median transaction time improves with6% compared to the best single operator and with 61% comparedto the worst single operator. The 90-percentile transaction timeimproves with 23% compared to the best single operator andwith 65% compared to the worst single operator.

  • 4.
    Ahrentorp, Fredrik
    et al.
    RISE, Swedish ICT, Acreo, Sensor Systems.
    Blomgrten, Jakob
    Coil comprising a winding comprising a multi-axial cable2011Patent (Other (popular science, discussion, etc.))
  • 5. Al-Awis, S
    et al.
    Fattah, A
    Schatz, R
    Pang, Xiaodan
    RISE, Swedish ICT, Acreo.
    Ozolins, Oskars
    RISE, Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei
    Chen, J
    Phenomenological Formula for Modelling of Physical Layer Impairments in Elastic Optical Networks2015In: From the sessionJoint Poster Session (ASu2A), 2015Conference paper (Refereed)
  • 6.
    Allison, R.S.
    et al.
    York University, Canada.
    Brunnstrom, Kjell
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Chandler, D.M.
    Shizuoka University, Japan.
    Colett, H.
    Intel Corp, USA.
    Corriveau, P.
    Intel Corp, USA.
    Daly, S.
    Dolby Laboratories Inc, USA.
    Goel, J.
    Qualcomm Technologies, USA.
    Long, J.Y.
    Intel Corp, USA.
    Wilcox, L.M.
    York University, Canada.
    Yaacob, Y.
    Shizuoka University, Japan.
    Yang, S. N.
    Pacific University, USA.
    Zhang, Y.
    Xi’an Jiaotong University, China.
    Perspectives on the definition of visually lossless quality for mobile and large format displays2018In: Journal of Electronic Imaging, ISSN 10179909, Vol. 27, no 5, article id 053035Article in journal (Refereed)
    Abstract [en]

    Advances in imaging and display engineering have given rise to new and improved image and videoapplications that aim to maximize visual quality under given resource constraints (e.g., power, bandwidth).Because the human visual system is an imperfect sensor, the images/videos can be represented in a mathematicallylossy fashion but with enough fidelity that the losses are visually imperceptible—commonly termed“visually lossless.” Although a great deal of research has focused on gaining a better understanding ofthe limits of human vision when viewing natural images/video, a universally or even largely accepted definitionof visually lossless remains elusive. Differences in testing methodologies, research objectives, and targetapplications have led to multiple ad-hoc definitions that are often difficult to compare to or otherwise employ inother settings. We present a compendium of technical experiments relating to both vision science and visualquality testing that together explore the research and business perspectives of visually lossless image quality,as well as review recent scientific advances. Together, the studies presented in this paper suggest that a singledefinition of visually lossless quality might not be appropriate; rather, a better goal would be to establish varyinglevels of visually lossless quality that can be quantified in terms of the testing paradigm.

  • 7.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Nord, S.
    Volvo Group Trucks Technology.
    Ottosson, J.
    Volvo Group Trucks Technology.
    Lampic, G.
    Elaphe Propulsion Technologies Ltd.
    Gotovac, G.
    Elaphe Propulsion Technologies Ltd.
    Zschieschang, O.
    Fairchild Semiconductor GmbH.
    Baumgartel, H.
    Hella Fahrzeugkomponenten GmbH.
    Brusius, M.
    Sensitec GmbH.
    Kaulfersch, E.
    Berliner Nanotest und Design GmbH.
    Hilpert, F.
    Fraunhofer IISB.
    Otto, A.
    Fraunhofer ENAS.
    Frankeser, S.
    Technische Universität Chemnitz.
    COSIVU - Compact, smart and reliable drive unit for fully electric vehicles2016In: 2016 Pan Pacific Microelectronics Symposium, Pan Pacific 2016Article in journal (Refereed)
    Abstract [en]

    COSIVU is a three year collaborative research project that ended in September 2015 and which has been funded within the European Green Car Initiative (now the European Green Vehicle Initiative). COSIVU addresses one of the most critical technical parts in fully electrical vehicles (FEV) besides the energy storage system: the mechatronic drive-train unit. The COSIVU project has delivered a new system architecture for multiple wheel drive-trains by a smart, compact and durable single-wheel drive unit with integrated electric motor, full silicon carbide (SiC) power electronics (switches and diodes), a novel control and health monitoring module with wireless communication, and an advanced ultra-compact cooling solution. DfR utilizing FEM simulations ensures first time right solutions. This paper presents the main results including the architecture of the drive train solution as well as the modular design of the inverter based on Inverter Building Blocks, one per phase. Performance tests are presented here for the first time for both the heavy duty commercial vehicle solution performed in a test rig by Volvo, and the tests of the COSIVU solution adapted to a passenger car done by Elaphe.

  • 8.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Wetter, Göran
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Interconnection of electrically conductive fibersfor application in smart textiles2015Conference paper (Other academic)
  • 9.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Weiler, Petra
    VDI/VDE Innovation + Technik GmbH, Germany.
    Mayora, Kepa
    IK4-Ikerlan, Spain.
    Kunze, Michael
    Hahn Schickard, Germany.
    Günzler, Rainer
    Hahn Schickard, Germany.
    Karmann, Stephan
    Hahn Schickard, Germany.
    Steinke, Arndt
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Winzer, Andreas
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Thronicke, Nicole
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Vazquez, Patricia
    Tyndall Institute, Ireland.
    Felemban, Shifa
    Tyndall Institute, Ireland.
    Moore, Eric
    Tyndall Institute, Ireland.
    Voirin, Guy
    CSEM SA, Switzerland.
    Scolan, Emmanuel
    CSEM SA, Switzerland.
    Smadja, Rita
    CSEM SA, Switzerland.
    SMARTER-SI - Smart access to manufacturing for Systems Integration2017Conference paper (Refereed)
    Abstract [en]

    The three year EU project SMARTER-SI that started in February 2015 has developed and tested a new production platform for smart systems that offer SMEs and “mid-cap” companies help to manufacture small and medium volumes. The ultimate goal of this project is to test a new concept for small lot production, which we call the Cooperative Foundry Model (CFM). The CFM is tested by combining components or parts of systems (building blocks) already developed by the RTOs involved in the project in so-called Application Experiments (AEs), thereby creating innovative Smart Systems which serve SMEs' product needs. During the first two years, four predefined AEs have been developed that consist of i) a multi-parametric point of care testing (POCT) device, ii) a dew-point measurement system, iii) a CO2 measurement system, and iv) a portable device that can be used to screen water quality.

  • 10.
    Andersson, G
    et al.
    RISE, Swedish ICT, Acreo, Sensor Systems.
    Winkler, D
    Mikrosystem – möjligheternas teknik: Om klassificering, metoder och tillämpning2000Book (Other academic)
    Abstract [sv]

    Mikrosystem är ett mycket expansivt område som erbjuder stora möjligheter till effektivisering och miniatyrisering av komplexa produkter. Nya unika egenskaper i samverkan med låga tillverkningskostnader har medfört att mikrosystemtekniken, MST, Microsystems Technology, erövrar såväl existerande produktområden som helt nya, t ex: bilar, flygplan medicinsk teknik, mindetektorer, rymdindustri m fl.

    Denna bok presenterar mikrosystemen och deras möjligheter. Den inleds med en unik marknadsöversikt där olika tillämpningsområdens utveckling och framtid diskuteras. En detaljrik framställning och klassificering av etablerade och kommande mikrosystem bildar en bred kunskapsbank för såväl specialister som oinvigda inom området. För konstruktörer som t ex vill öka sin kunskap om olika kategorier av sensorer förklaras begrepp och funktionsprinciper på ett utförligt sätt. Boken är även en lämplig introduktion till sensorer och mikromekanik på landets alla olika ingenjörsutbildningar.

  • 11.
    Andersson, GI
    RISE, Swedish ICT, Acreo, Sensor Systems.
    A novel 3-axis monolithic silicon accelerometer1995In: Digest of Techn. Papers, The 8th Int. Conf. on Solid-State Sensors and Actuators, Transducers ‘95/ Eurosensors IX), Volume II, pp. 558-561., 1995Conference paper (Refereed)
    Abstract [en]

    Working prototypes of a novel 3 axis monolithic silicon accelerometer have been manufactured at Chalmers University of Technology in co operation with Saab Combitech AB and the Department of Solid State Electronics. Experience from the prototypes is most encouraging as they have confirmed the theoretical predictions of negligible cross-axis sensitivity. The accuracy in the separation of an arbitrary directed acceleration into acceleration vectors in a Cartesian system of coordinates has shown to be high almost beyond expectation. The accelerometer has good potential to develop into a low cost 3 axis accelerometer in the 0 2 g range with a resolution of about 10 mg. This in part due to the simple manufacturing process.

  • 12. Andreou, Andreas S
    et al.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Automatic matching of software component requirements using semi-formal specifications and a CBSE ontology2015In: Evaluation of Novel Approaches to Software Engineering (ENASE), 2015 International Conference on, 2015, p. 118-128Conference paper (Refereed)
  • 13. Andreou, Andreas S
    et al.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Towards a CBSE Framework for Enhancing Software Reuse: Matching Component Properties Using Semi-Formal Specifications and Ontologies2015In: International Conference on Evaluation of Novel Approaches to Software Engineering, 2015, p. 98-121Conference paper (Refereed)
  • 14. Andrén, B
    et al.
    Wang, K
    Brunnstrom, Kjell
    RISE, Swedish ICT, Acreo.
    Characterizations of 3D TV: Active vs passive2012Conference paper (Refereed)
  • 15.
    Andrén, B
    et al.
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Wang, K
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Brunnström, K
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Rydell, N
    Fuller, S
    A comparison of visual ergonomic measurements between active and passive 3DTV2011In: EURODISPLAY 2011, 2011Conference paper (Refereed)
  • 16.
    Aragon, Santiago
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS. Technische Universität Darmstadt, Germany.
    Tiloca, Marco
    RISE - Research Institutes of Sweden, ICT, SICS.
    Maass, Max
    Technische Universität Darmstadt, Germany.
    Hollick, Matthias
    Technische Universität Darmstadt, Germany.
    Raza, Shahid
    RISE - Research Institutes of Sweden, ICT, SICS.
    ACE of Spades in the IoT Security Game: A Flexible IPsec Security Profile for Access Control2018Conference paper (Refereed)
    Abstract [en]

    The Authentication and Authorization for ConstrainedEnvironments (ACE) framework provides fine-grainedaccess control in the Internet of Things, where devices areresource-constrained and with limited connectivity. The ACEframework defines separate profiles to specify how exactlyentities interact and what security and communication protocolsto use. This paper presents the novel ACE IPsec profile, whichspecifies how a client establishes a secure IPsec channel witha resource server, contextually using the ACE framework toenforce authorized access to remote resources. The profilemakes it possible to establish IPsec Security Associations, eitherthrough their direct provisioning or through the standardIKEv2 protocol. We provide the first Open Source implementationof the ACE IPsec profile for the Contiki OS and testit on the resource-constrained Zolertia Firefly platform. Ourexperimental performance evaluation confirms that the IPsecprofile and its operating modes are affordable and deployablealso on constrained IoT platforms.

  • 17. Aramrattana, Maytheewat
    et al.
    Larsson, Tony
    Jansson, Jonas
    Dimensions of Cooperative Driving, ITS and Automation2015In: Intelligent Vehicles Symposium (IV), 2015Conference paper (Other academic)
  • 18.
    Aurelius, A
    et al.
    RISE, Swedish ICT, Acreo, Broadband Technology.
    Lagerstedt, C
    RISE, Swedish ICT, Acreo, Broadband Technology.
    IP traffic measurements in access networks2009In: Internetdagarna 2009 (Presentation), 2009Conference paper (Other academic)
  • 19.
    Bakowski, Mietek
    et al.
    RISE, Swedish ICT, Acreo.
    Lim, Jang-Kwon
    RISE, Swedish ICT, Acreo.
    Kaplan, Wlodek
    RISE, Swedish ICT, Acreo.
    Merits of Buried Grid Technology for SiC JBS Diodes2012In: GALLIUM NITRIDE AND SILICON CARBIDE POWER TECHNOLOGIES 2, 2012, p. 415-424Conference paper (Refereed)
    Abstract [en]

    The SiC Schottky barrier diodes for 200 degrees C to 250 degrees C operation have been developed using buried grid (BG) technology. 2A and 10A, 1700V BG JBS diodes have been fabricated and evaluated. Manufactured 10A, 1700V BG JBS diodes have leakage current at least three orders of magnitude lower compared to the typical data sheet values of the commercial devices. The leakage current at 250 degrees C is of the same order of magnitude as that of the commercial devices at 175 degrees C. The two alternative technologies for realization of BG, implantation and epitaxy, have been compared by simulations. The epitaxial grid is shown to have superior potential for best trade-off between on-state voltage and leakage current.

  • 20. Bastos, M. C.
    et al.
    Hammarquist, M.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A high-voltage reference testbed for the evaluation of high-voltage dividers for pulsed applications2010In: CPEM Digest (Conference on Precision Electromagnetic Measurements), 2010, p. 667-668Conference paper (Refereed)
    Abstract [en]

    The design, evaluation and commissioning of a high voltage reference testbed for pulsed applications to be used in the precision testing of high voltage dividers is described. The testbed is composed of a pulsed power supply, a reference divider based on compressed gas capacitor technology and an acquisition system which makes use of the fast measurement capabilities of the HP 3458 DVM. Results of the evaluation of the reference system are presented. © 2010 IEEE.

  • 21. Bastos, M. C.
    et al.
    Hammarquist, M.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A high-voltage test bed for the evaluation of high-voltage dividers for pulsed applications2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2462-2468, article id 5682402Article in journal (Refereed)
    Abstract [en]

    The design, evaluation, and commissioning of a high-voltage reference test bed for pulsed applications to be used in the precision testing of high-voltage dividers is described. The test bed is composed of a pulsed power supply, a reference divider based on compressed-gas capacitor technology, and an acquisition system that makes use of the fast measurement capabilities of the HP3458 digital voltmeter. The results of the evaluation of the reference system are presented. © 2006 IEEE.

  • 22. Belk, Marios
    et al.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Germanakos, Panagiotis
    Samaras, George
    Towards Implicit User Modeling based on Cognitive Styles and Web Interaction Data2014In: International journal on artificial intelligence tools, ISSN 0218-2130, Vol. 23, no 2Article in journal (Refereed)
  • 23.
    Belov, Ilia
    et al.
    Jönköping University.
    Arwidson, Jonas
    Saab AB.
    Poder, Ralf
    RISE - Research Institutes of Sweden.
    Johannesson, Pär
    RISE - Research Institutes of Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden. Jönköping University.
    Thermal fatigue prediction: consequences ofcycle reduction and material property variation2016Conference paper (Refereed)
  • 24.
    Belov, Ilia
    et al.
    Jönköping University.
    Lang, Jenny
    RISE - Research Institutes of Sweden.
    Hellén, J.
    Lim, J-K.
    Schødt, Bo
    RISE - Research Institutes of Sweden.
    Nilsson, Torbjörn
    Saab AB.
    Poder, Ralf
    RISE - Research Institutes of Sweden.
    Bakowski, Mietek
    RISE - Research Institutes of Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden. Jönköping University.
    Reliabilitystudy of GaN HEMTs2016Conference paper (Other academic)
  • 25.
    Ben Abdesslem, Fehmi
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Abrahamsson, Henrik
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ahlgren, Bengt
    RISE - Research Institutes of Sweden, ICT, SICS.
    Measuring Mobile Network Multi-Access for Time-Critical C-ITS Applications2018Conference paper (Refereed)
    Abstract [en]

    Cooperative Intelligent Transport Systems (C-ITS)make road traffic safer and more efficient, but require the mobilenetworks to handle time-critical applications. While some applicationsmay need new dedicated communications technologiessuch as IEEE 802.11p or 5G, other applications can use currentcellular networks. This study evaluates the performance that connectedvehicles can expect from existing networks, and estimatesthe potential gain of multi-access by simultaneously transmittingover several operators. We upload time-critical warning messagesfrom buses in Sweden, and characterise transaction times andnetwork availability. We conduct the experiments with differentprotocols: UDP, TCP, and HTTPS. Our results show that whenusing UDP, the median transaction time for sending a typicalwarning message is 135 ms. We also show that multi-access canbring this value down to 73 ms. For time-critical applicationsrequiring transaction times under 200 ms, multi-access canincrease availability of the network from to 57.4% to 92.0%.

  • 26. Bengtsson, Hoai
    et al.
    Chen, Lei
    Voronov, Alexey
    Englund, Cristofer
    RISE, Swedish ICT, Viktoria.
    Interaction Protocol for Highway Platoon Merge2015In: Intelligent Transportation Systems (ITSC), 2015 IEEE 18th International Conference on, 2015Conference paper (Refereed)
  • 27.
    Bergman, Anders
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Absolute calibration of a 100 KV DC divider1996Conference paper (Refereed)
    Abstract [en]

    An absolute determination of the ratio of a 100 kV DC divider has been made. A new Zener device that has recently become available has been used in a step-up mode to obtain the divider ratio. The uncertainty of the determination is 5.5 ppm.

  • 28.
    Bergman, Anders
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors2018In: NCSLI Measure, ISSN 1931-5775, Vol. 12, no 1, p. 34-41Article in journal (Refereed)
    Abstract [en]

    Modern dielectrics used in power capacitors can exhibit a dissipation factor lower than 0.005 %, which approaches the limits of presently available measurement techniques. This article reviews techniques, apparatus, and available calibration services for dissipation factor with regard to lowest achievable uncertainties. It is shown that further metrological advances are necessary to lower uncertainty in the measurement to levels at least five times less than presently achievable, in order to ensure traceable and quality-assured measurement of modern dielectrics with such low dissipation factors

  • 29.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Estimation of errors of voltage transformers on-site and the uncertainty of the estimate2000In: CPEM Digest (Conference on Precision Electromagnetic Measurements), 2000, p. 415-416Conference paper (Refereed)
    Abstract [en]

    A deregulated energy market needs demonstrably correct energy measurements for correct billing. Voltage transformers may be prone to drift implying a need for verification of their errors. A method to do this on-site using previous calibrations and comparative measurements has been developed and its uncertainty has been estimated.

  • 30.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    In-situ calibration of voltage transformers on the Swedish national grid1996In: IEE Conference Publication, 1996, no 426, p. 227-239Conference paper (Refereed)
    Abstract [en]

    The Swedish voltage transformer calibration system is based on the use of a very accurate multi-ratio inductive voltage transformer rated for the full dielectric requirements on the 400 kV grid. The output voltage from the voltage transformer under test is compared to the output from the reference transformer in an automatic bridge circuit. A computer is used to read the data from the bridge and to prepare the calibration certificate. A six decade precision inductive voltage transformer, an inductive voltage divider, can be employed as a ratio matching element.

  • 31.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Measuring system for in-situ calibration of high voltage transformers1994In: CPEM Digest (Conference on Precision Electromagnetic Measurements), 1994, p. 301-302Conference paper (Refereed)
    Abstract [en]

    A mobile calibration system for in-situ calibration of voltage transformers is analyzed with respect to measuring uncertainty under field conditions. The total basic uncertainty is better than ±0.015% respectively ±0.3 mrad. The system has been, used to calibrate 570 capacitor voltage transformers.

  • 32.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Metrology for high voltage direct current state-of-art and current development2011In: Joint IMEKO TC11-TC19-TC20 Int. Symp. Metrological Infrastructure, Environmental and Energy Measurement and Int. Symp. of Energy Agencies of Mediterranean Countries, IMEKO-MI 2011, 2011, p. 29-33Conference paper (Refereed)
    Abstract [en]

    Energy transmission by high voltage direct current - HVDC - is steadily increasing in the world, both at the highest power levels, but also at medium power, for example in connections of remote wind-parks to the main a.c. grid. Although principles for d.c. side measurements are known since long, support from metrology is not on par with the needs. An overview of available technologies and the challenges for metrology shows that advances are needed in determination of power losses in convertors, traceability for transmission line voltage measurement, power quality and d.c. side metering. Response to these challenges is given by seven national metrology institutes, one university and one industrial partner, in a project funded by the European Union under Article 169. The research will provide traceable calibrations and measurements in the assigned areas, and capability of measurement will extend to transmission line levels including 1000 kV d.c.

  • 33.
    Bergman, Anders
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Bergman, Sixten
    Consultant, Rönnvägen 1 A, 507 71 Gånghester, Sweden.
    Hoffmann, Christian
    Baur Gmbh, 6832 Sulz, Austria.
    Paulus, Eberhard
    Baur Gmbh, 6832 Sulz, Austria.
    Elg, Alf-Peter
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Traceable measurement of dielectric dissipation factor at Very Low Frequency2013Conference paper (Refereed)
    Abstract [en]

    Very Low Frequency (VLF) tests are often used for after-laying tests of power cables since the reactive power demand is much lower at VLF than at 50 Hz. In order to augment the usefulness of the test, it is often complemented by a measurement of dielectric dissipation factor (tan ), where the acceptance of the tested object is based on this measurement. A traceability chain for dissipation factor at high voltage and very low frequency has as yet not been recognized by the International Bureau of Weights and Measures (BIPM), which results in difficulties to prove the quality of the measurement. The measurement is complicated by the limited range of the current in the test object that can be resolved by available high voltage test equipment, thus limiting the possible choices of reference systems. A novel reference measuring system that can fulfil these needs has been developed at SP Technical Research Institute of Sweden in the capacity as National Measurement Institute. The traceability of the system to National Standards of Measurement is ensured by careful scientific work and analyses. This measuring system has the ability to measure dissipation factor at 0.1 Hz in the voltage range from 0.5 kV up to 50 kV with an uncertainty better than 0.004 %.

  • 34.
    Bergman, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Marx, R.
    Schon, K.
    Suomalainen, E. -P
    Hallstrom, J.
    Intercomparison of AC peak voltage measurement1999In: IEE Conference Publication, 1999, no 467, p. 1.9.S1-1.12.S1Conference paper (Refereed)
    Abstract [en]

    An intercomparison on the measurement of high voltage peak value has been carried out between the National Metrology Institutes of Sweden and Germany in 1995 and between Finland and Sweden in 1996. The results show a very satisfactory agreement between the participants. It seems that part of the discrepancies found may be due to the loose definition of peak voltage in IEC 60060-1.

  • 35.
    Bergman, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Nilsson, H.
    A Constant Voltage Source Based on a Mercury Battery1993In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 42, no 2, p. 365-367Article in journal (Refereed)
    Abstract [en]

    A constant voltage source based on a stable mercury battery has been developed at SP (Swedish National Testing and Research Institute). By using as active current compensation technique, the inherent high stability of a mercury battery can be retained up to a load current of several milliamperes.

  • 36.
    Bergman, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Pogliano, U.
    Hällström, J.
    Wright, P.
    Lucas, W.
    Merev, A.
    Rietveld, G.
    Kurrat, M.
    Rickmann, J.
    Metrology for high voltage direct current2010In: CPEM Digest (Conference on Precision Electromagnetic Measurements), 2010, p. 669-670Conference paper (Refereed)
    Abstract [en]

    HVDC energy transmission is crucial for a successful uptake of renewable energy sources in the grid. A research program is described, intended to provide metrology support for the needs of HVDC energy transmission. This program will provide improvements for the present HVDC metrology infrastructure: accurate measurement of HVDC, determination of losses in HVDC systems, on-site power quality measurements at HVDC substations, and DC metering. It is a combined effort of 7 European national metrology institutes, one university and one industrial partner. © 2010 IEEE.

  • 37.
    Bergman, Sixten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    New reference measurement system for calibration of VLF high voltage2010In: CPEM Digest (Conference on Precision Electromagnetic Measurements), 2010, p. 682-683Conference paper (Refereed)
    Abstract [en]

    A reference measuring system for 200 kV at very low frequency (0.1 Hz, VLF) has been developed and verified. The reference system will make it possible to perform traceable calibration of VLF test systems used for after-laying-tests of extruded power cables. © 2010 IEEE.

  • 38.
    Bergman, Sixten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Bergman, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    New reference measurement system for calibration of VLF high voltage2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2422-2426, article id 5746641Article in journal (Refereed)
    Abstract [en]

    A reference measuring system for 200 kV from very low frequencies (0.1 Hz, VLF) up to 50 Hz based on traditional high-voltage components, such as compressed gas capacitors, has been developed and verified. The verification of the measuring system has been performed by two experimental methods, one directly measuring the scale factor and one using measurements over the frequency and voltage range of the components of the measuring system. The frequency dependence of the measuring system proved to be one of the dominating uncertainties and was extensively researched. Proper correction for known errors and estimation of uncertainty contributions proved that traceable measurement of VLF voltage can be made with an uncertainty of less than 0.038% up to a voltage of 200 kV. This measurement service has been notified to be included in SP entries for Bureau International des Poids et Mesures key comparison database and can serve an important need for the cable industry. © 2006 IEEE.

  • 39. Boano, Carlo Alberto
    et al.
    Duquennoy, Simon
    Forster, Anna
    Gnawali, Omprakash
    Jacob, Romain
    Kim, Hyung-Sin
    Landsiedel, Olaf
    Marfievici, Ramona
    Picco, Gian Pietro
    Vilajosana, Xavier
    Watteyne, Thomas
    Zimmerling, Marco
    IoTBench: Towards a Benchmark for Low-power Wireless Networking2018Conference paper (Refereed)
  • 40.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Edwards, Mark
    University of Oxford.
    Kaulfersch,, Eberhard
    Fraunhofer Institute for Electronic Nano Systems ENAS.
    Neumaier, Klas
    Zschieschang, Olaf
    Hilpert, F
    Otto, Alexander
    Modelling and fabrication of a SiC-based power module with double sidedcooling2015Conference paper (Other academic)
  • 41.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Edwards, Michael
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Simon, J
    Noël, S
    Romanjek, K
    Simulation-driven packaging of proof of concept thermoelectric modules: Proceedings of SMTA PanPacific Microelectronics Symposium 20142014In: Proceedingsof SMTA Pan Pacific Microelectronics Symposium 2014, 2014Conference paper (Other academic)
  • 42.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Elektronikhårdvara.
    Ottosson, Jonas
    Neumaier, Klaus
    Zschieschang, Olaf
    Kaulfersch, Eberhard
    Edwards, Michael
    Otto, Alexander
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Elektronikhårdvara.
    Design and Fabrication of a SiC-Based Power Module with Double-Sided Cooling for Automotive Applications2015In: Advanced Microsystems for Automotive Applications 2015: Smart Systems for Green and Automated Driving, 2015, Vol. 4, p. 157-172Conference paper (Refereed)
    Abstract [en]

    The electrification of drive trains combined with special requirements of the automotive and heavy construction equipment applications drives the development of small, highly integrated and reliable power inverters. To minimize the volume and increase the reliability of the power switching devices a module consisting of SiC devices with double sided cooling capability has been developed. There are several benefits related to cooling the power devices on both sides. The major improvement is the ability to increase the power density, and thereby reduce the number of active switching devices required which in turn reduces costs. Other expected benefits of more efficient cooling are reductions in volume and mass per power ratio. Alternatively, improved reliability margins due to lower temperature swings during operation are can be expected. Removing the wire bonds on the top side of the devices is expected to improve the reliability regardless, since wire bonds are known to be one of the main limitations in power switching devices. In addition, it is possible to design the package with substantially lower inductance, which can allow faster switching of the devices. In this paper the design, simulations and fabrication process of a double sided SiC-based power module are presented.

  • 43.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Ottosson, Jonas
    Volvo Group Truck Technology.
    Otto, Alex
    Fraunhofer ENAS.
    Mann, Alexander
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Zschieschang, Olaf
    Fairchild Semiconductor GmbH.
    Frankeser, Sophia
    TU Chemnitz.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Thermal Simulations and Experimental Verification of Power Modules Designed for Double Sided Cooling2016In: Electronic Components and Technology, ISSN 0569-5503, ISSN 05695503, p. 1415-1422Article in journal (Refereed)
    Abstract [en]

    Cooling power modules on both sides of the active switching devices reduces the operational junction temperature compared to conventional single sided cooling. In this work, thermal simulations of power modules based on single sided cooling concepts are compared with double sided cooling counterparts. Expected junction temperatures, maximum temperatures and maximum current capability is analyzed. In addition, experimental verification in the form of comparisons with thermal characterization tests for both single-And double sided power modules based on SiC bipolar junction transistors is presented. Results from simulations show that cooling of both sides of the active switching devices can reduce the thermal resistance by more than 40 percent. This number depends on the heat transfer coefficient. From one example, simulating a worst case stall condition of the electric machine, the use of double sided cooling reduces the maximum junction temperature from 167 °C to 106 °C at a load current of 300 A using a heat transfer coefficient of 4 kW/m2K and 4 kHz switching frequency. Furthermore, the temperature decreases to 97°C if AlN-based DBC substrates are used instead of alumina DBCs. Results from the experimental comparison between double-And single sided cooling showed that the maximum temperature for a load current range of 15 A to 50 A was reduced by 18 percent to 55 percent by using double sided cooling. At a device temperature of 60 °C, the increased thermal capability of the double sided version allowed for a 20 A higher load current, which corresponded to operation under 50 percent higher power losses. Double sided cooling also increased the maximum current capability through a single SiC BJT by more than 20 percent beyond the maximum current capability through the single sided cooling version.

  • 44.
    Brunnstrom, Kjell
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Mid Sweden University, Sweden.
    Barkowsky, Marcus
    University of Applied Sciences, Germany.
    Statistical quality of experience analysis: on planning the sample size and statistical significance testing2018In: Journal of Electronic Imaging (JEI), ISSN 1017-9909, E-ISSN 1560-229X, Vol. 27, no 5, article id 053013Article in journal (Refereed)
    Abstract [en]

    This paper analyzes how an experimenter can balance errors in subjective video quality tests betweenthe statistical power of finding an effect if it is there and not claiming that an effect is there if the effect is not there,i.e., balancing Type I and Type II errors. The risk of committing Type I errors increases with the number ofcomparisons that are performed in statistical tests. We will show that when controlling for this and at thesame time keeping the power of the experiment at a reasonably high level, it is unlikely that the number oftest subjects that are normally used and recommended by the International Telecommunication Union (ITU),i.e., 15 is sufficient but the number used by the Video Quality Experts Group (VQEG), i.e., 24 is more likelyto be sufficient. Examples will also be given for the influence of Type I error on the statistical significance ofcomparing objective metrics by correlation. We also present a comparison between parametric and nonparametricstatistics. The comparison targets the question whether we would reach different conclusions on the statisticaldifference between the video quality ratings of different video clips in a subjective test, based on thecomparison between the student T-test and the Mann–Whitney U-test. We found that there was hardly a differencewhen few comparisons are compensated for, i.e., then almost the same conclusions are reached. Whenthe number of comparisons is increased, then larger and larger differences between the two methods arerevealed. In these cases, the parametric T-test gives clearly more significant cases, than the nonparametrictest, which makes it more important to investigate whether the assumptions are met for performing a certaintest.

  • 45.
    Brunnström, Kjell
    et al.
    Mid Sweden University, Sweden.
    Sjöström, Mårten
    Mid Sweden University, Sweden.
    Muhammad, Imran
    HIAB AB, Sweden;Mid Sweden University, Sweden.
    Magnus, Pettersson
    HIAB AB, Sweden.
    Johanson, Mathias
    Alkit Communications AB, Sweden.
    Quality of Experience for a Virtual Reality simulator2018In: Human Vision and Electronic Imaging 2018 / [ed] Rogowitz, B.;Pappas, T.;De Ridder H., The Society for Imaging Science and Technology, 2018Conference paper (Refereed)
    Abstract [en]

    In this study, we investigate a VR simulator of a forestry crane used for loading logs onto a truck, mainly looking at Quality of Experience (QoE) aspects that may be relevant for task completion, but also whether there are any discomfort related symptoms experienced during task execution. The QoE test has been designed to capture both the general subjective experience of using the simulator and to study task completion rate. Moreover, a specific focus has been to study the effects of latency on the subjective experience, with regards both to delays in the crane control interface as well as lag in the visual scene rendering in the head mounted display (HMD). Two larger formal subjective studies have been performed: one with the VR-system as it is and one where we have added controlled delay to the display update and to the joystick signals. The baseline study shows that most people are more or less happy with the VR-system and that it does not have strong effects on any symptoms as listed in the Simulator Sickness Questionnaire (SSQ). In the delay study we found significant effects on Comfort Quality and Immersion Quality for higher Display delay (30 ms), but very small impact of joystick delay. Furthermore, the Display delay had strong influence on the symptoms in the SSQ, and causing test subjects to decide not to continue with the complete experiments. We found that this was especially connected to the longer added Display delays (≥ 20 ms).

  • 46. Chaillot, A.
    et al.
    Tegehall, Per-Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Venet, N
    Hokka, J
    ENEPIG Finish: An Alternative Solution for Space Printed Circuit Boards2014Conference paper (Other academic)
  • 47. Chatzipetrou, Panagiota
    et al.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Angelis, Lefteris
    Andreou, Andreas S
    A multivariate statistical framework for the analysis of software effort phase distribution2015In: Information and Software Technology, ISSN 0950-5849, E-ISSN 1873-6025, Vol. 59, p. 149-169Article in journal (Refereed)
  • 48. Chen, Lei
    et al.
    Englund, Cristofer
    RISE, Swedish ICT, Viktoria.
    Cooperative Intersection Management: A Survey2016In: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 17, no 2, p. 570-586Article in journal (Refereed)
    Abstract [en]

    Intersection management is one of the most challenging problems within the transport system. Traffic light-based methods have been efficient but are not able to deal with the growing mobility and social challenges. On the other hand, the advancements of automation and communications have enabled cooperative intersection management, where road users, infrastructure, and traffic control centers are able to communicate and coordinate the traffic safely and efficiently. Major techniques and solutions for cooperative intersections are surveyed in this paper for both signalized and nonsignalized intersections, whereas focuses are put on the latter. Cooperative methods, including time slots and space reservation, trajectory planning, and virtual traffic lights, are discussed in detail. Vehicle collision warning and avoidance methods are discussed to deal with uncertainties. Concerning vulnerable road users, pedestrian collision avoidance methods are discussed. In addition, an introduction to major projects related to cooperative intersection management is presented. A further discussion of the presented works is given with highlights of future research topics. This paper serves as a comprehensive survey of the field, aiming at stimulating new methods and accelerating the advancement of automated and cooperative intersections.

  • 49. Chen, Lei
    et al.
    Englund, Cristofer
    RISE, Swedish ICT, Viktoria.
    Cooperative ITS - EU standards to accelerate cooperative mobility2014In: The 3rd International Conference on Connected Vehicles & Expo (ICCVE 2014), 2014, p. 681-686Conference paper (Refereed)
  • 50. Chen, Lei
    et al.
    Habibovic, Azra
    Englund, Cristofer
    RISE, Swedish ICT, Viktoria.
    Voronov, Alexey
    Walter, Anders
    Coordinating Dangerous Goods Vehicles: C-ITS Applications for Safe Road Tunnels2015In: Intelligent Vehicles Symposium (IV), 2015Conference paper (Refereed)
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