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  • 1.
    Englund, Cristofer
    et al.
    RISE, Swedish ICT, Viktoria.
    Kovaceva, Jordanka
    Lindman, Magdalena
    Grönvall, John-Fredrik
    Using random forests for data mining data and drowsy driver classification using FOT data2012In: Proceedings of On the Move to Meaningful Internet Systems: OTM 2012, 2012, Vol. 5766, p. 748-758Conference paper (Refereed)
  • 2.
    Englund, Cristofer
    et al.
    RISE, Swedish ICT, Viktoria.
    Nilsson, Maria
    RISE, Swedish ICT, Viktoria.
    Voronov, Alexey
    RISE, Swedish ICT, Viktoria.
    The application of data mining techniques to model visual distraction of bicyclists2016In: Expert systems with applications, ISSN 0957-4174, E-ISSN 1873-6793, Vol. 52, p. 99-107Article in journal (Refereed)
    Abstract [en]

    This paper presents a novel approach to modelling visual distraction of bicyclists. A unique bicycle simulator equipped with sensors capable of capturing the behaviour of the bicyclist is presented. While cycling two similar scenario routes, once while simultaneously interacting with an electronic device and once without any electronic device, statistics of the measured speed, head movements, steering angle and bicycle road position along with questionnaire data are captured. These variables are used to model the self-assessed distraction level of the bicyclist. Data mining techniques based on random forests, support vector machines and neural networks are evaluated for the modelling task. Out of the total 71 measured variables a variable selection procedure based on random forests is able to select a fraction of those and consequently improving the modelling performance. By combining the random forest-based variable selection and support vector machine-based modelling technique the best overall performance is achieved. The method shows that with a few observable variables it is possible to use machine learning to model, and thus predict, the distraction level of a bicyclist.

  • 3.
    Englund, Cristofer
    et al.
    RISE, Swedish ICT, Viktoria.
    Verikas, Antanas
    A novel approach to estimate proximity in a random forest: An exploratory study2012In: Expert systems with applications, ISSN 0957-4174, E-ISSN 1873-6793, Vol. 39, no 17, p. 13046-13050Article in journal (Refereed)
  • 4.
    Kakkar, Aditya
    et al.
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Louchet, Hadrien
    VPIphotonics GmBH, Germany.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    A path to use large linewidth LO in 28 Gbd 16-QAM metro links2015In: 2015 European Conference on Optical Communication (ECOC), 2015, article id 7341948Conference paper (Refereed)
    Abstract [en]

    We experimentally investigate the possibility to mitigate local oscillator induced Equalization Enhanced Phase Noise penalty. The results pave the way for the use of even 10 MHz linewidth local oscillator lasers in 28 Gbd 16-QAM metro links.

  • 5.
    Kaline P., Furlan
    Hamburg University, Germany.
    Diaz, Ana (Contributor)
    Paul Scherrer Institut, Switzerland.
    Holler, Mirko (Contributor)
    Paul Scherrer Institut, Switzerland.
    Krekeler, Tobias (Contributor)
    Hamburg University of Technology, Germany.
    Ritter, Martin (Contributor)
    Hamburg University of Technology, Germany.
    Petrov, Alexander Yu. (Contributor)
    Hamburg University of Technology, Germany; ITMO University, Russia.
    Eich, Manfred (Contributor)
    Hamburg University of Technology, Germany.
    Blick, Robert (Contributor)
    Hamburg University of Technology, Germany.
    Schneider, Gerold A. (Contributor)
    Hamburg University of Technology, Germany.
    Greving, Imke (Contributor)
    Hamburg University of Technology, Germany.
    Zierold, Robert (Contributor)
    Hamburg University of Technology, Germany.
    Janßen, Rolf (Contributor)
    Hamburg University of Technology, Germany.
    Photonic materials for high-temperature applications: Synthesis and characterization by X-ray ptychographic tomography2018In: Applied Materials Today, ISSN 2352-9407, Vol. 13, p. 359-369Article in journal (Refereed)
    Abstract [en]

    Photonic materials for high-temperature applications need to withstand temperatures usually higher than 1000 °C, whilst keeping their function. When exposed to high temperatures, such nanostructured materials are prone to detrimental morphological changes, however the structure evolution pathway of photonic materials and its correlation with the loss of material's function is not yet fully understood. Here we use high-resolution ptychographic X-ray computed tomography (PXCT) and scanning electron microscopy (SEM) to investigate the structural changes in mullite inverse opal photonic crystals produced by a very-low-temperature (95 °C) atomic layer deposition (ALD) super-cycle process. The 3D structural changes caused by the high-temperature exposure were quantified and associated with the distinct structural features of the ceramic photonic crystals. Other than observed in photonic crystals produced via powder colloidal suspensions or sol-gel infiltration, at high temperatures of 1400 °C we detected a mass transport direction from the nano pores to the shells. We relate these different structure evolution pathways to the presence of hollow vertexes in our ALD-based inverse opal photonic crystals. Although the periodically ordered structure is distorted after sintering, the mullite inverse opal photonic crystal presents a photonic stopgap even after heat treatment at 1400 °C for 100 h.

  • 6.
    Larsson, Emanuel
    Hamburg University of Technology,Germany.
    De Carlo, Francesco (Contributor)
    Lilleodden, Erica (Contributor)
    Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg 21073, Germany.
    Storm, Malte (Contributor)
    Wilde, Fabian (Contributor)
    Kaixiong, Hu (Contributor)
    Müller, Martin (Contributor)
    Greving, Imke (Contributor)
    Nanoporous gold: a hierarchical and multiscale 3D test pattern for characterizing X-ray nano-tomography systems2019In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 26, no 1Article in journal (Refereed)
    Abstract [en]

    Full-field transmission X-ray microscopy (TXM) is a well established technique, available at various synchrotron beamlines around the world as well as by laboratory benchtop devices. One of the major TXM challenges, due to its nanometre-scale resolution, is the overall instrument stability during the acquisition of the series of tomographic projections. The ability to correct for vertical and horizontal distortions of each projection image during acquisition is necessary in order to achieve the effective 3D spatial resolution. The effectiveness of such an image alignment is also heavily influenced by the absorption properties and strong contrast of specific features in the scanned sample. Here it is shown that nanoporous gold (NPG) can be used as an ideal 3D test pattern for evaluating and optimizing the performance of a TXM instrument for hard X-rays at a synchrotron beamline. Unique features of NPG, such as hierarchical structures at multiple length scales and high absorbing capabilities, makes it an ideal choice for characterization, which involves a combination of a rapid-alignment algorithm applied on the acquired projections followed by the extraction of a set of both 2D- and 3D-descriptive image parameters. This protocol can be used for comparing the efficiency of TXM instruments at different synchrotron beamlines in the world or benchtop devices, based on a reference library of scanned NPG samples, containing information about the estimated horizontal and vertical alignment values, 2D qualitative parameters and quantitative 3D parameters. The possibility to tailor the ligament sizes of NPG to match the achievable resolution in combination with the high electron density of gold makes NPG an ideal 3D test pattern for evaluating the status and performance of a given synchrotron-based or benchtop-based TXM setup.

  • 7.
    Navarro, Jaime Rodrigo
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ozolins, Oskars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Olmedo, Miguel Iglesias
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Carrier Phase Recovery Algorithms for Coherent Optical Circular mQAM Systems2016In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 34, no 11, p. 2717-2723Article in journal (Refereed)
    Abstract [en]

    The phase noise tolerance of circular multilevel quadrature amplitude modulation (C-mQAM) constellations employing different carrier phase recovery (CPR) algorithms is studied. A differential decoding scheme and a bit mapping for this type of constellations are proposed. A novel CPR scheme for C-mQAM constellations is also presented. The particular distribution of the constellation points in a C-mQAM signal is exploited to reduce the required Nth power for the removal of the modulation component by a factor of two. Hence, the computational complexity of the proposed algorithm is drastically reduced. The combined linewidth symbol duration product (??Ts) tolerance of different CPR algorithms for C-mQAM constellations is studied and compared with the proposed CPR scheme. The results are analyzed at 3.8e-3 and 1e-2 bit error rate forward error correction limits. The proposed CPR scheme achieves similar ??Ts tolerance compared to single stage BPS algorithm while its computational complexity is reduced by group factors of 27.2 | 32.3, and 30.5 | 32.6 (in the form of multipliers | adders) for C-16QAM and C-64QAM, respectively.

  • 8.
    Ozolins, O.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    An, Y.
    Lali-Dastjerdi, Z.
    Ding, Y.
    Bobrovs, V.
    Ivanovs, G.
    Peucheret, C.
    Cascadability of silicon microring resonators for 40-Gbit/s OOK and DPSK optical signals2012In: 2012 Asia Communications and Photonics Conference (ACP), 2012, p. 1-3Conference paper (Refereed)
    Abstract [en]

    The cascadability of a single silicon micro-ring resonator for CSRZ-OOK and CSRZ-DPSK signals is experimentally demonstrated at 40 Gbit/s for the first time. Error-free performance is obtained for both modulation formats after 5 cascaded resonators.

  • 9.
    Ozolins, Oskars
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Pang, Xiodan
    RISE - Research Institutes of Sweden, ICT.
    Olmedo, Miguel Iglesias
    KTH Royal Institute of Technology, Sweden.
    Udalcovs, Aleksejs
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Kakkar, Aditya
    KTH Royal Institute of Technology, Sweden.
    Navarro, Jaime Rodrigo
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Westergren, Urban
    KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE - Research Institutes of Sweden, ICT, Acreo.
    “High-speed optical and wireless transmission - challenges and achievements”2016In: 2016 Advances in Wireless and Optical Communications (RTUWO), 2016Conference paper (Refereed)
    Abstract [en]

    The cloud services together with the huge size datasets are driving demand for bandwidth in datacenters. The 400 Gbps client-side links are demanding a solution. The intensity modulation and direct-detection systems together with integrated semiconductor lasers and modulators appear as promising solution in four optical lanes at 100 Gbps net rate in order to reduce complexity, size, power consumption and cost.

  • 10.
    Pang, X.
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jia, S.
    DTU Technical University of Denmark, Denmark; Tianjin University, China.
    Ozolins, O.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Yu, X.
    Zhejiang University, China.
    Hu, H.
    DTU Technical University of Denmark, Denmark.
    Marcon, L.
    KTH Royal Institute of Technology, Sweden.
    Guan, P.
    DTU Technical University of Denmark, Denmark.
    Ros, F. D.
    DTU Technical University of Denmark, Denmark.
    Popov, S.
    DTU Technical University of Denmark, Denmark.
    Jacobsen, G.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Galili, M.
    DTU Technical University of Denmark, Denmark.
    Morioka, T.
    DTU Technical University of Denmark, Denmark.
    Zibar, D.
    DTU Technical University of Denmark, Denmark.
    Oxenlowe, L. K.
    DTU Technical University of Denmark, Denmark.
    Single channel 106 Gbit/s 16QAM wireless transmission in the 0.4 THz band2017In: 2017 Optical Fiber Communications Conference and Exhibition (OFC), 2017Conference paper (Refereed)
    Abstract [en]

    We experimentally demonstrate a single channel 32-GBd 16QAM THz wireless link operating in the 0.4 THz band. Post-FEC net data rate of 106 Gbit/s is successfully achieved without any spatial/frequency multiplexing.

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