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  • Juell-Skielse, G
    et al.
    Juell-Skielse, E
    Hjalmarsson, Anders
    RISE, Swedish ICT, Viktoria.
    Johannesson, P
    Rudmark, Daniel
    What happens next? – A survey of the afterlife of innovation contests2014In: Proceedings of 2014 Pre-ECIS Workshop Rethinking Information Systems in the Public Sector: Bridging Academia and Public service, AIS SIG eGovernment , 2014Conference paper (Refereed)
    Abstract [en]

    Innovation contests are becoming popular instruments for stimulating development of digital services using open data. However, experience indicates that only a limited number of the results developed during these events become viable digital services attracting a significant user base. Hence, an unresolved question is how organizers choose to support the service development process after the contest is concluded. To further deepen our knowledge about the design of digital innovation contests and the support for the processes after the contests are concluded, we conducted a survey of the websites of 33 digital innovation contests.

  • Pettersson, Stefan
    RISE, Swedish ICT, Viktoria.
    Lightweight infrastructure for electric vehicle charging2015In: World Electric Vehicle Journal Vol. 7 - ISSN 2032-6653 - ©2015 WEVA, 2015, article id WEVJ7-0631Conference paper (Refereed)
    Abstract [en]

    Electric vehicles need a charging infrastructure. In this paper, it will be argued that Sweden already has a charging infrastructure that potentially could provide all cars with electricity if they were electrified. The charging infrastructure consists of existing motor heaters sockets and outlets near e.g. villas and holiday homes which directly or for low cost can be rebuild to provide electric vehicles with energy. Building a lightweight infrastructure for electric vehicle charging consisting of simple sockets is roughly hundred times cheaper than building fast chargers or a charging infrastructure with Type 2 plug with charging modes Mode 2 or Mode 3. Therefore, it is wise to build a lightweight charging infrastructure for electric vehicle charging and use the connectivity of the vehicle to e.g. enable smart charging and other desirable services/applications. Parts of the conclusions and results in this paper have been established in a Swedish project denoted ELVIIS consisting of partners from research (Viktoria Swedish ICT), car industry (Volvo Car Cooperation), telecom sector (Ericsson) and utility industry (Göteborg Energi).

  • Karlsson, Stefan
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Bingham, Paul A.
    Sheffield Hallam University, UK.
    Advances and Challenges of Cover Glasses for Efficient Harvesting of Solar Electricity2018Conference paper (Refereed)
    Abstract [en]

    Harvesting of solar energy through photovoltaic (PV) modules is an essential technology for increasing the share of renewable energy sources, both immediately and in the future. The glass cover material constitutes a significant part of the cost. Research and development of the cover glass is needed to increase the service lifetime and to reduce the cost per watt peak [1]. Recent research efforts in the LIMES project show that the addition of optically active components absorb harmful UV light and simultaneously convert those UV photons into visible light [2]. Thus, the profit is two-fold, increasing both service lifetime and efficiency by up to 4%. Further, the cover glass composition can be optimized to enhance the mechanical and chemical durability. It has been shown that it is possible to increase the indentation crack resistance [2] and the hydrolytic durability by three and four times respectively by modifying the glass composition. Thermal strengthening of glass for PV modules are required for mechanical durability. However, there is an increasing demand of light-weight PV modules, therefor is thermal strengthening of thin cover glass needed to meet the increasing demand. In-situ chemical vapour deposition (CVD) of Al2O3 and thermal strengthening of the cover glass provides an additionally crack resistant and chemically durable glass surface. Developments of transparent and robust multifunctional coatings that provide anti-reflective and self-cleaning properties on the outer glass surface are desired [4]. Thereby is maximal transmission and reduced soiling achieved. On the interior surface are anti-reflective and chemical barrier multifunctional coatings desirable to increase transmission and reducing potential induced degradation (PID) [5]. The LIMES concept has been demonstrated by quantitative measurements and as Si solar cells. The scale-up of the LIMES concept and additional material challenges to increase the efficiency and service lifetime will be discussed. Replacing the conventional silver strings in PV modules with transparent conductive tape and back-reflecting backsheet materials are among the promising techniques for further maximizing the efficiency.

  • trt, dfd
    trtrt1980In: rtrtArticle in journal (Other academic)
  • Rex, Emma
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Rosander, Erica
    KTH Royal Institute of Technology, Sweden.
    Røyne, Frida
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Veide, Andreas
    KTH Royal Institute of Technology, Sweden.
    Ulmanen, Johanna
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    A systems perspective on chemical production from mixed food waste: The case of bio-succinate in Sweden2018Report (Other academic)
    Abstract [en]

    The option of producing the chemical succinic acid from bio-based resources is well in line with current political and industrial ambitions for a bio-based economy. A little explored but intriguing biomass feedstock opportunity is food waste. Mixed food waste is especially appealing as it represents less resource competition than more homogenous food waste fractions. The feasibility of producing succinic acid from mixed food waste depends on both technical and societal system structures. Therefore, to assess the production prospect, it is important to investigate all relevant system components. This study explores from such multiple perspectives the feasibility of chemical production as a viable added pathway for mixed food waste, using microbial production of succinic acid from municipal solid waste in Sweden as an example. The perspectives explored are: 1) feedstock feasibility, 2) societal drivers and barriers for technology progress, and 3) resource availability. Findings show that even though, from a technical feasibility and resource availability perspective, production seems possible, it lacks institutional support and actor commitment and alignment for development in Sweden. Findings also show that a holistic and interdisciplinary systems perspective contributes valuable insight when assessing prospects for bio-based chemicals. 

  • Yu, A
    et al.
    RISE, Swedish ICT, Viktoria.
    Pettersson, S
    RISE, Swedish ICT, Viktoria.
    Wedlin, J
    RISE, Swedish ICT, Viktoria.
    Jin, Y
    Yu, Jie
    A user study on station-based EV car sharing in Shanghai2016In: EVS29 Symposium, 2016Conference paper (Refereed)
  • Voronov, Alexey
    et al.
    RISE, Swedish ICT, Viktoria.
    Hultén, J
    RISE, Swedish ICT, Viktoria.
    Wedlin, J
    Englund, Cristofer
    RISE, Swedish ICT, Viktoria.
    Radar reflecting pavement markers for vehicle automation2016Conference paper (Refereed)
    Abstract [en]

    Dependable and fail-safe control of autonomous vehicles requires multiple independent sensors for lane detection and positioning. From analysis of modern sensing technologies, we conclude that radars are underutilized for positioning, and that they might be an enabling technology for achieving safety requirements posed by the standard ISO 26262. To fully utilize the radar potential, we have conducted a pre-study of equipping infrastructure with radar reflectors. We estimate that such reflectors should be installed in the lane markings, about 20-25 meters apart and with some kind of identification. We propose to design and evaluate a combi-reflector based on the traditional cat’s eye design, which will be detectable both by human drivers, radars and lidars. Furthermore, the combi-reflector can be equipped with a magnet for in-vehicle electromagnetic field sensor. From the redundancy evaluation performed, we conclude that the proposed solution increases the level of redundancy significantly. Therefore, the proposed solution could be an enabler for autonomous driving. 

  • Søgaard, J
    et al.
    Krasula, L
    Shahid, M
    Temel, D
    Brunnström, K
    RISE, Swedish ICT, Acreo.
    Razaak, M
    Applicability of Existing Objective Metrics of Perceptual Quality for Adaptive Video Streaming2016In: Proc. of IS&T conference Electronic Imaging, Image Quality and System Performance XIII, Society for Imaging Science and Technology (IS&T) , 2016Conference paper (Refereed)
    Abstract [en]

    Objective video quality metrics are designed to estimate the quality of experience of the end user. However, these objective metrics are usually validated with video streams degraded under common distortion types. In the presented work, we analyze the performance of published and known full-reference and noreference quality metrics in estimating the perceived quality of adaptive bit-rate video streams knowingly out of scope. Experimental results indicate not surprisingly that state of the art objective quality metrics overlook the perceived degradations in the adaptive video streams and perform poorly in estimating the subjective quality results.

  • Smith, Göran
    et al.
    RISE, Swedish ICT, Viktoria.
    ofe, Hosea Ayaba
    Sandberg, Johan
    Exploring the Value Proposition of an Open Data Marketplace2016Conference paper (Refereed)
    Abstract [en]

    Open data marketplaces have emerged as a mode of addressing open data adoption barriers. However, knowledge of how such marketplaces affect digital service innovation in open data ecosystems is limited. This paper explores their value proposition for open data users based on an exploratory case study. Five prominent perceived values are identified: lower task complexity, higher access to knowledge, increased possibilities to influence, lower risk and higher visibility. The impact on open data adoption barriers is analyzed and the consequences for ecosystem sustainability is discussed. The paper concludes that open data marketplaces can lower the threshold of using open data by providing better access to open data and associated support services, and by increasing knowledge transfer within the ecosystem. 

  • Andersson Ersman, Peter
    et al.
    RISE, Swedish ICT, Acreo, Printed electronics.
    Kawahara, J
    Roll to roll printable technology platform consisting of electrolyte-based components2011Conference paper (Refereed)
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