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  • 2951. Van der Wijngaart, W
    et al.
    Thorsen, Anders
    RISE, Swedish ICT, Acreo. RISE Research Institutes of Sweden, Safety and Transport, Electrification and Reliability.
    Stemme, G
    A seat microvalve nozzle for optimal gas flow capacity at large controlled pressure2004In: J.MEMS, Vol. 17, p. 233-Article in journal (Refereed)
  • 2952.
    Van Haute, Tom
    et al.
    Ghent University, Belgium.
    De Poorter, Eli
    Ghent University, Belgium.
    Crombez, Pieter
    Televic NV, Belgium.
    Lemic, Filip
    Technical University of Berlin, Germany.
    Handziski, Vlado
    Technical University of Berlin, Germany.
    Wirström, Niklas
    RISE, Swedish ICT, SICS.
    Wolisz, Adam
    Technical University of Berlin, Germany.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Moerman, Ingrid
    Ghent University, Belgium.
    Performance Analysis of Multiple Indoor Positioning Systems in a Healthcare Environment2016In: International Journal of Health Geographics, E-ISSN 1476-072X, Vol. 15, no 7Article in journal (Refereed)
    Abstract [en]

    Background: The combination of an aging population and nursing staff shortages implies the need for more advanced systems in the healthcare industry. Many key enablers for the optimization of healthcare systems require provisioning of location awareness for patients (e.g. with dementia), nurses, doctors, assets, etc. Therefore, many Indoor Positioning Systems(IPSs) will be indispensable in healthcare systems. However, although many IPSs have been proposed in literature, most of these have been evaluated in non-representative environments such as office buildings rather than in a hospital. Methods: To remedy this, the paper evaluates the performance of existing IPSs in an operational modern healthcare environment: the “Sint-Jozefs kliniek Izegem” hospital in Belgium. The evaluation (data-collecting & data-processing) is executed using a standardized methodology and evaluates the point accuracy, room accuracy and latency of multiple IPSs. To evaluate the solutions, the position of a stationary device was requested at 73 evaluation locations. By using the same evaluation locations for all IPSs the performance of all systems could objectively be compared. Results: Several trends can be identified such as the fact that Wi-Fi based fingerprinting solutions have the best accuracy result (point accuracy of 1.21 m and room accuracy of 98 %) however it requires calibration before use and needs 5.43 s to estimate the location. On the other hand, proximity based solutions (based on sensor nodes) are significantly cheaper to install, do not require calibration and still obtain acceptable room accuracy results. Conclusion: As a conclusion of this paper, Wi-Fi based solutions have the most potential for an indoor positioning service in case when accuracy is the most important metric. Applying the fingerprinting approach with an anchor installed in every two rooms is the preferred solution for a hospital environment.

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  • 2953.
    Van Haute, Tom
    et al.
    Ghent University, Belgium.
    De Poorter, Eli
    Ghent University, Belgium.
    Lemic, Filip
    Technical University of Berlin, Germany.
    Handziski, Vlado
    Technical University of Berlin, Germany.
    Wirström, Niclas
    RISE, Swedish ICT, SICS.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Wolisz, Adam
    Technical University of Berlin, Germany.
    Moerman, Ingrid
    Ghent University, Belgium.
    Platform for Benchmarking of RF-based Indoor Localization Solutions2015In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 53, no 9, p. 126-133Article in journal (Refereed)
    Abstract [en]

    Over the last years, the number of indoor localization solutions has grown exponentially and a wide variety of different technologies and approaches is being explored. Unfortunately, there is currently no established standardized evaluation method for comparing their performance. As a result, each solution is evaluated in a different environment using proprietary evaluation metrics. Consequently, it is currently extremely hard to objectively compare the performance of multiple localization solutions with each other. To address the problem, we present the EVARILOS Benchmarking Platform, which enables an automated evaluation and comparison of multiple solutions in different environments and using multiple evaluation metrics. We propose a testbed independent benchmarking platform, combined with multiple testbed dependent plug-ins for executing experiments and storing performance results. The platform implements the standardized evaluation method described in the EVARILOS Benchmarking Handbook, which is aligned with the upcoming ISO/IEC 18305 standard “Test and Evaluation of Localization and Tracking Systems”. The platform and the plugins can be used in real-time on existing wireless testbed facilities, while also supporting a remote offline evaluation method using precollected data traces. Using these facilities, and by analyzing and comparing the performance of three different localization solutions, we demonstrate the need for objective evaluation methods that consider multiple evaluation criteria in different environments.

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  • 2954.
    Van Haute, Tom
    et al.
    Ghent University, Belgium.
    De Poorter, Eli
    Ghent University, Belgium.
    Moerman, Ingrid
    Ghent University, Belgium.
    Lemic, Filip
    Technische Universität Berlin, Germany.
    Handziski, Vlado
    Technische Universität Berlin, Germany.
    Wolisz, Adam
    Technische Universität Berlin, Germany.
    Wirström, Niklas
    RISE, Swedish ICT, SICS.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS.
    Comparability of RF-based indoor localisation solutions in heterogeneous environments: An experimental study2016In: International Journal of Ad Hoc and Ubiquitous Computing, ISSN 1743-8225, E-ISSN 1743-8233, Vol. 23, no 1-2, p. 92-114Article in journal (Refereed)
    Abstract [en]

    The growing popularity of indoor localisation research has resulted in a significant amount of research papers describing and evaluating innovative localisation solutions. Unfortunately, the results from most of these research papers cannot easily be compared since they are evaluated in different environments, use different evaluation criteria and typically tailor their solutions towards a single testbed environment. To evaluate how these different conditions influence the localisation performance, in this paper an exhaustive set of experiments has been performed, in which three different localisation solutions have been evaluated using multiple metrics in three different test environments: two types of office environments and an industry-like factory environment. None of the used localisation solutions was previously optimised for any of these test environments and they were all evaluated under similar conditions. The results reveal several weaknesses in the evaluation methods used in the majority of existing scientific literature of indoor localisation solutions.

  • 2955. Van Haute, Tom
    et al.
    De Poorter, Eli
    Rossey, Jen
    Moerman, Ingrid
    Handziski, Vlado
    Behboodi, Arash
    Lemic, Filip
    Wolisz, Adam
    Wirström, Niklas
    RISE, Swedish ICT, SICS.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Combez, Pieter
    Verhoeve, Piet
    de las Heras, Jose Javier
    The EVARILOS Benchmarking Handbook: Evaluation of RF-based Indoor Localization Solutions2013Conference paper (Refereed)
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  • 2956. Van Laerhoven, K.
    et al.
    Villar, N.
    Schmidt, A.
    Gellersen, H. -W
    Håkansson, M.
    Holmquist, Lars Erik
    RISE, Swedish ICT, Viktoria.
    Pin and play: The surface as network medium2003In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 41, no 4, p. 90-95Article in journal (Refereed)
    Abstract [en]

    Integrating appliances in the home through a wired network often proves to he impractical: routing cables is usually difficult, changing the network structure afterward even more so, and portable devices can only be connected at fixed connection points. Wireless networks aren't the answer either: batteries have to be regularly replaced or changed, and what they add to the device's size and weight might be disproportionate for smaller appliances. In Pin&Play, we explore a design space in between typical wired and wireless networks, investigating the use of surfaces to network objects that are attached to it. This article gives an overview of the network model, and describes functioning prototypes that were built as a proof of concept.

  • 2957. van Roy, Peter
    et al.
    Ghodsi, Ali
    RISE, Swedish ICT, SICS. DSL.
    Stefani, Jean-Bernard
    Haridi, Seif
    RISE, Swedish ICT, SICS. DSL.
    Coupaye, Thierry
    Reinefeld, Alexander
    Winter, Ehrhard
    Yap, Roland H.C.
    Self Management of Large-Scale Distributed Systems by Combining Structured Overlay Networks and Components2005Conference paper (Refereed)
    Abstract [en]

    This position paper envisions making large-scale distributed applications self managing by combining component models and structured overlay networks. A key obstacle to deploying large-scale applications running on Internet is the amount of management they require. Often these applications demand specialized personnel for their maintenance. Making applications self-managing will help removing this obstacle. Basing the system on a structured overlay network will allow extending the abilities of existing component models to large-scale distributed systems. Structured overlay networks provide guarantees for efficient communication, e±cient load-balancing, and self-manage in case of joins, leaves, and failures. Component models, on the other hand, support dynamic configuration, the ability of part of the system to reconfigure other parts at run-time. By combining overlay networks with component models we achieve both low-level as well as high-level self-management. We will target multi-tier applications, and specifically we will consider three-tier applications using a self-managing storage service.

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  • 2958. van Roy, Peter
    et al.
    Haridi, Seif
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Concepts, Techniques, and Models of Computer Programming2004 (ed. 1)Book (Refereed)
  • 2959.
    Vanin, E
    RISE, Swedish ICT, Acreo.
    Performance evaluation of intensity modulated optical OFDM system with digital basebdistortion2011In: Optics Express, E-ISSN 1094-4087, Vol. 19, no 5, p. 4280-93Article in journal (Refereed)
  • 2960.
    Vanin, E
    RISE, Swedish ICT, Acreo.
    Signal restoration in intensity-modulated optical OFDM access systems2011In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 36, no 22, p. 4338-40Article in journal (Refereed)
  • 2961. Vanin, E
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Analytical estimation of laser phase noise induced BER floor in coherent receiver with digital signal processing2010In: Optics Express, E-ISSN 1094-4087, Vol. 18, no 5, p. 4246-59Article in journal (Refereed)
  • 2962.
    Vanin, E
    et al.
    RISE, Swedish ICT, Acreo.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Signal Patterning Nonlinear Phase Noise in 111 Gb/s PolMux- RZ-DQPSK Systems with 50 GHz Channel Spacing2009In: J. Opt. Commun, Vol. 31Article in journal (Refereed)
  • 2963.
    Vanin, E. V.
    et al.
    RISE, Swedish ICT, Acreo.
    Jacobsen, G.
    RISE, Swedish ICT, Acreo.
    Anders, Berntson
    RISE, Swedish ICT, Acreo.
    Nonlinear phase noise separation method for simulation of ASK optical fibre transmission systems with strong signal-noise interaction2007In: 2007 33rd European Conference and Exhibition of Optical Communication, ECOC 2007, Institute of Electrical and Electronics Engineers Inc. , 2007Conference paper (Refereed)
    Abstract [en]

    We propose a method that enables accurate ASK system modelling even when the detected optical field obeys non-Gaussian statistics with a substantial amount of nonlinear phase noise accumulated in the fibre due to signal-noise interaction.

  • 2964.
    Vanin, E V
    et al.
    RISE, Swedish ICT, Acreo.
    Persson, U
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Spectral functional forms for gain noise characterization of erbium doped fiber amplifiers2002In: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 20, p. 243-49Article in journal (Refereed)
  • 2965.
    Vanin, EV
    et al.
    RISE, Swedish ICT, Acreo.
    Grishin, AM
    Khartsev, SI
    Tarasenko, O
    RISE, Swedish ICT, Acreo.
    Johansson, P
    RISE, Swedish ICT, Acreo.
    Broadbphotoluminescence from pulsed laser deposited Er2O3 films2006In: Journal of Luminescence, Vol. 121, p. 256-58Article in journal (Refereed)
  • 2966.
    Vanin, Evgenii V.
    RISE, Swedish ICT, Acreo.
    Analytical model for optical wireless OFDM system with digital signal restoration2012In: 2012 IEEE Globecom Workshops, GC Wkshps 2012, 2012, p. 1213-1218, article id 6477753Conference paper (Refereed)
    Abstract [en]

    An analytical model for performance evaluation of the optical wireless communication (OWC) system employing orthogonal frequency division multiplexing (OFDM) with deliberate signal clipping and digital signal restoration is developed. The deliberate digital baseband clipping is introduced in the system transmitter in order to reduce a high peak-to-average power ratio (PAPR) of the OFDM signal and achieve an optimum modulation index of the intensity-modulated (IM) optical signal. In the system receiver a post-detection digital signal restoration is applied in an iterative manner in order to compensate for the effect of clipping noise and improve the system performance. It is emphasized that at the operation of decoding in the process of iterative signal restoration the main mechanism limiting the system performance at small clipping levels of the signal is introduced.

  • 2967.
    Vanin, Evgeny
    et al.
    RISE, Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Anders, Berntson
    RISE, Swedish ICT, Acreo.
    Effective simulation method for parametric signal-noise interaction in transmission fibers2006In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 31, no 15, p. 2272-74Article in journal (Refereed)
    Abstract [en]

    We propose a new method for effective numerical simulation of transmission system performance and study of correlated noise evolution along an optical fiber with nonlinear parametric interaction between the amplified spontaneous emission (ASE) and the modulated optical signal. The method is based on an evaluation of the noise covariance matrix by using full nonlinear Schrödinger equation (NLSE) and an analytical model for the optical receiver. Using extensive brute-force Monte Carlo simulation as a verification tool, we test the accuracy of the method and illustrate the analytical receiver model limitations in the case of moderate as well as substantial growth of non-Gaussian optical noise along the optical fiber transmission link.

  • 2968.
    Vanin, Evgeny
    et al.
    RISE, Swedish ICT, Acreo.
     Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Anders, Berntson
    RISE, Swedish ICT, Acreo.
    Nonlinear phase noise separation method for on-off keying transmission system modeling with non-Gaussian noise generation in optical fibers2007In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 32, p. 1740-Article in journal (Refereed)
    Abstract [en]

    We propose a novel method for effective simulation of optical fiber transmission system performance with nonlinear interaction between the amplified spontaneous emission noise and the modulated optical signal employing on–off keying. The method enables a standard analytical description of the receiver operation even when the detected optical field obeys non-Gaussian statistics with a substantial amount of nonlinear phase noise accumulated along the fiber link due to strong signal–noise interaction.

  • 2969.
    Varela, Martin
    et al.
    RISE, Swedish ICT, SICS.
    Marsh, Ian
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Grönvall, Björn
    RISE, Swedish ICT, SICS.
    A Systematic Study of PESQ's Performance (from a Networking Perspective)2006Conference paper (Refereed)
    Abstract [en]

    In this paper we study, in a systematic way, how the behavior of PESQ estimations varies with the network loss process. We assess the variability of the estimations with respect to the network conditions and the speech content, and also their accuracy, by comparing the estimates with subjective assessments.

  • 2970.
    Varisteas, Georgios
    et al.
    KTH Royal Institute of Technology, Sweden.
    Brorsson, Mats
    RISE, Swedish ICT, SICS. KTH Royal Institute of Technology, Sweden.
    Palirria: accurate on-line parallelism estimation for adaptive work-stealing2016In: Concurrency and Computation, ISSN 1532-0626, E-ISSN 1532-0634, Vol. 28, no 2, p. 472-491Article in journal (Refereed)
    Abstract [en]

    Summary We present Palirria, a self-adapting work-stealing scheduling method for nested fork/join parallelism that can be used to estimate the number of utilizable workers and self-adapt accordingly. The estimation mechanism is optimized for accuracy, minimizing the requested resources without degrading performance. We implemented Palirria for both the Linux and Barrelfish operating systems and evaluated it on two platforms: a 48-core Non-Uniform Memory Access (NUMA) multiprocessor and a simulated 32-core system. Compared with state-of-the-art, we observed higher accuracy in estimating resource requirements. This leads to improved resource utilization and performance on par or better to executing with fixed resource allotments.

  • 2971.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Polytechnic University of Milan, Italy.
    Carlsson, Mats
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Directional Transmissions and Receptions for High-throughput Bulk Forwarding in Wireless Sensor Networks2015In: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems (SenSys '15), 2015, 8, p. 351-364Conference paper (Refereed)
    Abstract [en]

    We present DPT: a wireless sensor network protocol for bulk traffic that uniquely leverages electronically switchable directional (ESD) antennas. Bulk traffic is found in several scenarios and supporting protocols based on standard antenna technology abound. ESD antennas may improve performance in these scenarios; for example, by reducing channel contention as the antenna can steer the radiated energy only towards the intended receivers, and by extending the communication range at no additional energy cost. The corresponding protocol support, however, is largely missing. DPT addresses precisely this issue. First, while the network is quiescent, we collect link metrics across all possible antenna configurations. We use this information to formulate a constraint satisfaction problem (CSP) that allows us to find two multi-hop disjoint paths connecting source and sink, along with the corresponding antenna configurations. Domain-specific heuristics we conceive ameliorate the processing demands in solving the CSP, improving scalability. Second, the routing configuration we obtain is injected back into the network. During the actual bulk transfer, the source funnels data through the two paths by quickly alternating between them. Packet forwarding occurs deterministically at every hop. This allows the source to implicitly "clock" the entire pipeline, sparing the need of proactively synchronizing the transmissions across the two paths. Our results, obtained in a real testbed using 802.15.4-compliant radios and custom ESD antennas we built, indicate that DPT approaches the maximum throughput supported by the link layer, peaking at 21 4 kbit/s in the settings we test.

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  • 2972.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Polytechnic University of Milan, Italy.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Poster: Coordination of Wireless Sensor Networks using Visible Light2015In: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems (SenSys '15), 2015, 7, p. 421-422Conference paper (Refereed)
    Abstract [en]

    Wireless sensor networks are often deployed indoors where artificial lighting is present. Indoor lighting is increasingly being composed of Light Emitting Diodes (LEDs) that offer the ability to precisely control the intensity and the frequency of the light carrier. This can be used to coordinate wireless sensor networks (WSN). The periodic variations in the light intensity can synchronise the clocks on the sensor nodes, while the ability to modulate the light carrier enables the transmission of control information like channel assignment or transmission schedules. We present Guidelight, a simple mechanism that uses controlled fluctuations in the light intensity to coordinate sensor nodes. Guidelight can wake-up or time synchronise sensor nodes or even send small bits of control information to them. All of these have separate dedicated solutions in WSN. Guidelight aims to provide a single solution to all these problems. Our initial experiments demonstrate the ability of Guidelight to trigger sensor nodes. We demonstrate Guidelight is able to trigger sensor nodes selectively at a mean error of 21 µs.

  • 2973.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Poster Abstract: Directional Transmissions and Receptions for Burst Forwarding using Disjoint Paths2014Conference paper (Refereed)
    Abstract [en]

    Bulk data transmission is an important traffic pattern of many sensor network applications. These applications deliver large amounts of sensed data to a sink node for further processing. Most of the existing bulk data transmission protocols use a single flow of communication. This is inefficient as the radio at the source node is transmitting and the sink node is receiving packets for only half of the duration of the burst. We show in this paper that reduced contention because of directional communication enables us to construct node disjoint paths from the source to the sink node using only one wireless channel. This allows us to forward subsequent packets in the burst on the disjoint paths which maximises the radio transmit and receive time at the source and the sink node respectively. We demonstrate that this doubles the sink throughput as compared to a single flow of communication.

  • 2974.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Poster Abstract: Directional Transmissions and Receptions for High Throughput Burst Forwarding2013Conference paper (Refereed)
    Abstract [en]

    Many sensor network applications generate large amounts of sensed data. These often need to be delivered reliably to the sink node for further processing. In such applications, high communication throughput allows for more data to be sensed. Intra-path interference is a problem in reliable forwarding of data and afects the end-to-end throughput. We show that using antennas that allow directional transmissions and receptions significantly reduces intra-path interference and enables high throughput forwarding of packet bursts over multiple hops using only one wireless channel.

  • 2975.
    Varshney, Ambuj
    et al.
    Uppsala University, Sweden.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Using Directional Transmissions and Receptions to Reduce Contention in Wireless Sensor Networks2014Conference paper (Refereed)
    Abstract [en]

    Electronically Switched Directional (ESD) antennas allow software-based control of the direction of maximum antenna gain. ESD antennas are feasible for wireless sensor network. Existing studies with these antennas focus only on controllable directional transmissions. These studies demonstrate reduced contention and increased range of communication with no energy penalty. Unlike existing literature, in this chapter we experimentally explore controllable antenna directionality at both sender and receiver. One key outcome of our experiments is that directional transmissions and receptions together considerably reduce channel contention. As a result, we can significantly reduce intra-path interference.

  • 2976.
    Vasileva, Elena
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ye, Fei
    KTH Royal Institute of Technology, Sweden.
    Marinins, Aleksandrs
    KTH Royal Institute of Technology, Sweden.
    Etcheverry, Sebastián
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Optimization of optical gain in composite materials containing Rh6G dye and gold nanoparticles2015In: Asia Communications and Photonics Conference 2015, 2015, article id ASu1A.2Conference paper (Refereed)
    Abstract [en]

    The existence of metal nanoparticles in a dye material can lead not only to quenching or enhancement of dye luminescence, or random lasing action, but also to the change of the fundamental material characteristic as optical gain.

  • 2977.
    Vasseur, Jean-Philippe
    et al.
    Contiki.
    Dunkels, Adam
    RISE, Swedish ICT, SICS. RISE, Swedish ICT, SICS, Computer Systems Laboratory. NES.
    Interconnecting Smart Objects with IP - The Next Internet2010 (ed. 10)Book (Refereed)
  • 2978.
    Vassilev, Vessen
    et al.
    Chalmers University of Technology, Sweden.
    Stoew, Borys
    RISE, Swedish ICT, Acreo.
    Blomgren, Jakob
    RISE, Swedish ICT, Acreo.
    Andersson, Gert
    RISE, Swedish ICT, Acreo.
    A mm-Wave Sensor for Remote Measurement of Moisture in Thin Paper Layers2015In: IEEE Transactions on Terahertz Science and Technology, ISSN 2156-342X, E-ISSN 2156-3446, Vol. 5, no 5, p. 770-778, article id 7202922Article in journal (Refereed)
    Abstract [en]

    We present the design and performance of a moisture sensor operating at 200 GHz for remote measurement of water content in paper. The system aims at industrial processes such as offset print and paper production. The moisture content in the paper is derived through an accurate measurement of the loss of a signal transmitted through the paper. The system is designed to achieve high accuracy in the measurement of the loss presented by the paper, not affected by 1/f or drift noise. The sensor is capable of resolving 0.005 dB loss achieving a moisture resolution of 0.1% for moisture content higher than 15%. The resolution can be improved if necessary in exchange for longer measurement times. The sensor is tested in offset print and paper production processes and measured values are compared to laboratory measured samples of the paper.

  • 2979.
    Vegas Olmos, Juan Jose
    et al.
    DTU Technical University of Denmark, Denmark.
    Pang, Xiaodan
    RISE, Swedish ICT, Acreo. DTU Technical University of Denmark, Denmark.
    Lebedev, Alexander
    DTU Technical University of Denmark, Denmark.
    Sales, M.
    DTU Technical University of Denmark, Denmark.
    Tafur Monroy, Idelfonso
    DTU Technical University of Denmark, Denmark.
    Wireless Wireline Service Convergence in Next Generation Optical Access Networks €” The FP7 WISCON Project2014In: IEICE transactions on communications, Vol. e97.b, no 8, p. 1537-1546Article in journal (Refereed)
    Abstract [en]

    The next generation of information technology demands both high capacity and mobility for applications such as high speed wireless access capable of supporting broadband services. The transport of wireless and wireline signals is converging into a common telecommunication infrastructure. In this paper, we will present the Marie Curie Framework Program 7 project "Wirelessand wireline service convergence in next generation optical access networks" (WISCON), which focuses on the conception and study of novel architectures for wavelength-division-multiplexing (WDM) optical multi-modulation format radio-over-fiber (RoF) systems; this is a promising solution to implement broadband seamless wireless -wireline access networks. This project successfully concluded in autumn 2013, and is being follow up by another Marie Curie project entitled "flexible edge nodes for dynamic optical interconnection of access and core networks" (FENDOI), which will be also briefly described.

  • 2980.
    Verginadis, Yiannis
    et al.
    National Technical University of Athens, Greece.
    Michalas, Antonis
    RISE, Swedish ICT, SICS.
    Gouvas, Panagiotis
    Ubitech, Greece.
    Schiefer, Gunther
    Karlsruhe Institute of Technology, Germany.
    Hubsch, Gerald
    CAS Software, Germany.
    Paraskakis, Iraklis
    South East European Research Centre, Greece.
    PaaSword: A holistic data privacy and security by design framework for cloud services2015In: CLOSER 2015 - 5th International Conference on Cloud Computing and Services Science, Proceedings, SciTePress , 2015, p. 206-213Conference paper (Refereed)
    Abstract [en]

    The valuable transformation of organizations that adopt cloud computing is indisputably accompanied by a number of security threats that should be considered. In this paper, we outline significant security challenges presented when migrating to a cloud environment and propose PaaSword-a novel holistic, data privacy and security by design, framework that aspires to alleviate them. The envisaged framework intends to maximize and fortify the trust of individual, professional and corporate users to cloud services. Specifically, PaaSword involves a context-aware security model, the necessary policies enforcement and governance mechanisms along with a physical distribution, encryption and query middleware, aimed at facilitating the implementation of secure and transparent cloud-based applications.

  • 2981. Vigoureux, M
    et al.
    Berde, B
    Andersson, L
    RISE, Swedish ICT, Acreo.
    Cinkler, T
    Levrau, L
    Ondata, M
    Colle, D
    Fdez-Palacios, J
    Jger, M
    Multilayer Traffic Engineering for GMPLS-Enabled Networks2005In: IEEE Communications Magazin, Vol. 43, no 7, p. 44-50Article in journal (Refereed)
  • 2982.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Architectures for service differentiation in overloaded Internet servers2002Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Web servers become overloaded when one or several server resources such as network interface, CPU and disk become overutilized. Server overload leads to low server throughput and long response times experienced by the clients. Traditional server design includes only marginal or no support for overload protection. This thesis presents the design, implementation and evaluation of architectures that provide overload protection and service differentiation in web servers. During server overload not all requests can be processed in a timely manner. Therefore, it is desirable to perform service differentiation, i.e., to service requests that are regarded as more important than others. Since requests that are eventually discarded also consume resources, admission control should be performed as early as possible in the lifetime of a web transaction. Depending on the workload, some server resources can be overutilized while the demand on other resources is low because certain types of requests utilize one resource more than others. The implementation of admission control in the kernel of the operating system shows that this approach is more efficient and scalable than implementing the same scheme in user space. We also present an admission control architecture that performs admission control based on the current server resource utilization combined with knowledge about resource consumption of requests. Experiments demonstrate more than 40% higher throughput during overload compared to a standard server and several magnitudes lower response times. This thesis also presents novel architectures and implementations of operating system support for predictable service guarantees. The Nemesis operating system provides applications with a guaranteed communication service using the developed TCP/IP implementation and the scheduling of server resources. SILK (Scout in the Linux kernel) is a new networking stack for the Linux operating system that is based on the Scout operating system. Experiments show that SILK enables prioritizing and other forms of service differentiation between network connections while running unmodified Linux applications.

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  • 2983.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Overload behaviour and protection of event-driven web servers2002Conference paper (Refereed)
  • 2984.
    Voigt, Thiemo
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Self-organizing, Collision-free, Multi-channel Convergecast2008In: Poster sesssion, 2008, 1, , p. 2Conference paper (Refereed)
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  • 2985.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Ahlgren, Bengt
    RISE, Swedish ICT, SICS, Decisions, Networks and Analytics lab.
    Scheduling TCP in the Nemesis operating system1999Conference paper (Refereed)
  • 2986.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    The Impact of Knowledge about Neighbors on the Efficiency of Geographic Routing2005In: Proceedings of Radio Sciences and Communication RVK'05, 2005, 1Conference paper (Refereed)
  • 2987.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Alonso, Juan
    RISE, Swedish ICT, SICS.
    Reliability in distributed tcp caching.2004Conference paper (Refereed)
  • 2988.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Braun, Torsten
    On-demand Construction of Non-interfering Multiple Paths in Wireless Sensor Networks2005In: Proceedings of the 2nd Workshop on Sensor Networks at Informatik 2005, 2005, 1Conference paper (Refereed)
    Abstract [en]

    In this paper we present a routing scheme for on-demand construction of multiple non-interfering paths in wireless sensor networks. One usage of this multipath scheme is to provide a source the ability to increase the likelihood that its data reaches the sink by sending a copy of a packet on more than one path. The routing scheme is based on the assumption that the sensor nodes are aware of their geographic position.

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  • 2989.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Dunkels, AdamRISE, Swedish ICT, SICS.Marron, Pedro Jose
    Proceedings of the 2008 Workshop on Real-World Wireless Sensor Networks (REALWSN 2008)2008Conference proceedings (editor) (Refereed)
  • 2990.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Eriksson, Joakim
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Österlind, Fredrik
    RISE, Swedish ICT, SICS.
    Sauter, Robert
    Aschenbruck, Nils
    Marron, Pedro
    Reynolds, Vinny
    Shu, Lei
    Visser, Otto
    Koubaa, Anis
    CONET.
    Köpke, Andreas
    Towards comparable simulations of cooperating objects and wireless sensor networks2009Conference paper (Refereed)
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  • 2991.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Gunningberg, Per
    Adaptive resource-based web server admission control2002Conference paper (Refereed)
  • 2992.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Gunningberg, Per
    Handling multiple bottlenecks in web servers using adaptive inbound controls2002Conference paper (Refereed)
  • 2993.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Gunningberg, Per
    Kernel-based control of persistent web server connections2001In: Performance Evaluation Review, ISSN 0163-5999, E-ISSN 1557-9484, Vol. 29, no 2, p. 20-25Article in journal (Refereed)
    Abstract [en]

    Several overload admission control architectures have been developed to protect web servers from overload. Some of these architectures base their admission decision on information found in the HTTP header. In this context, persistent connections represent a challenging problem since the HTTP header of the first request does not reveal any information about the resource consumption of the requests that might follow on the same connection. In this paper, we present an architecture that prevents uncontrollable server overload caused by persistent connections. We evaluate our approach by various experiments.

  • 2994.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Hewage, Kasun
    Uppsala University, Sweden.
    Alm, Per
    Uppsala University, Sweden.
    Poster Abstract: Smartphone Support for Persons who Stutter2014Conference paper (Refereed)
    Abstract [en]

    Stuttering is a very complex speech disorder that affects around 0.7% of adults while around 5% of the population have stuttered at some point. A large percentage of the affected people tend to speak more fluently when their own speech is played back to their ear with some type of alteration. While this has been done with special devices, smartphones can be used for this purpose. We report on our initial experiences on building such an application and demonstrate problems with delay caused by the lack of real-time support for audio playback in the Android operating system. We also discuss ideas for future work to improve app support for people who stutter.

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  • 2995.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Uppsala University, Sweden.
    Mottola, Luca
    RISE, Swedish ICT, SICS, Computer Systems Laboratory. Politecnico di Milano, Italy.
    Hewage, Kasun
    Uppsala University, Sweden.
    Understanding Link Dynamics in Wireless Sensor Networks with Dynamically Steerable Directional Antennas2013Conference paper (Refereed)
    Abstract [en]

    By radiating the power in the direction of choice, electronically-switched directional (ESD) antennas can reduce network contention and avoid packet loss. There exists some ESD antennas for wireless sensor networks, but so far researchers have mainly evaluated their directionality. There are no studies regarding the link dynamics of ESD antennas, in particular not for indoor deployments and other scenarios where nodes are not necessarily in line of sight. Our long-term experiments confirm that previous findings that have demonstrated the dependence of angle-of-arrival on channel frequency also hold for directional transmissions with ESD antennas. This is important for the design of protocols for wireless sensor networks with ESD antennas: the best antenna direction, i.e., the direction that leads to the highest packet reception rate and signal strength at the receiver, is not stable but varies over time and with the selected IEEE 802.15.4 channel. As this requires protocols to incorporate some form of adaptation, we present an intentionally simple and yet efficient mechanism for selecting the best antenna direction at run-time with an energy overhead below 2% compared to standard omni-directional transmissions.

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  • 2996.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Ritter, Hartmut
    Schiller, Jochen
    Solar-aware routing in wireless sensor networks2003Conference paper (Refereed)
  • 2997.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Ritter, Hartmut
    Schiller, Jochen
    Utilizing Solar Power in Wireless Sensor Networks2003Conference paper (Refereed)
  • 2998.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Ritter, Hartmut
    Schiller, Jochen
    Dunkels, Adam
    RISE, Swedish ICT, SICS.
    Alonso, Juan
    RISE, Swedish ICT, SICS.
    Solar-aware Clustering in Wireless Sensor Networks.2004Conference paper (Refereed)
  • 2999.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Roedig, Utz
    Landsiedel, Olaf
    Samarasinghe, Kasun
    Bogadi SP, Mahesh
    Practical Network Coding in Sensor Networks: Quo Vadis?2012Conference paper (Refereed)
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  • 3000.
    Voigt, Thiemo
    et al.
    RISE, Swedish ICT, SICS, Computer Systems Laboratory.
    Tewari, Renu
    Freimuth, Douglas
    Mehra, Ashish
    Kernel mechanisms for service differentiation in overloaded web servers2001In: Proceedings of the General Track: 2002 USENIX Annual Technical Conference, 25-30 June 2001, Boston, USA, 2001, 1Conference paper (Refereed)
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57585960616263 2951 - 3000 of 3215
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