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  • 1.
    Jonsson, Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Inbyggda system (CERES).
    Two fiber-ribbon ring networks for parallel and distributed computing systems1998Inngår i: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 37, nr 12, s. 3196-3204Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ring networks made of fiber-ribbon point-to-point links are proposed. The first network is a control-channel based network in which one fiber in each link joins with others to form a control-channel ring. This ring improves performance of the network by sending medium access control information immediately before the data transmissions. High throughputs can be achieved in the network due to pipelining, i.e., several packets can travel through the network simultaneously but in different segments of the ring. The network can meet tough performance demands in, e.g., massively parallel signal processing systems, which is shown by example. Also, real-time demands can be met using slot reserving. The network, called CC-FPR (control-channel based fiber-ribbon pipeline ring), can be built today using off-the-shelf fiber optic components. The increasingly good price/performance ratio for fiber-ribbon links indicates a high potential for the success of the proposed kind of networks; a prototype is currently under development. The second network is similar to first except that it divides the network into two subnetworks, one for packet-switched traffic and one for circuit-switched traffic. When the main data flow in the network does not change rapidly, this is a good choice for a simple but powerful network.

  • 2.
    Kaestner, Anders P.
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Nilsson, Carl Magnus
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Laboratoriet för intelligenta system.
    Estimating the relative shrinkage profile of newsprint2003Inngår i: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 42, nr 5, s. 1467-1475Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When water is removed from the paper during paper making, a dimensional change occurs in which the paper shrinks in the direction perpendicular to the direction of processing. The dimensional changes vary across the web and influence, e.g., the surface and compression properties of the paper; they also complicate the control of the paper machine. In this article, a robust method for estimating the relative shrinkage profile is presented. The method is based on a one-dimensional recording of the imprints from the forming fabric, using a fluorescence technique. The recording is transformed into a time-frequency spectrum, on which three different frequency estimators have been evaluated. In simulations on synthetic data and measurements on paper profiles the estimator that maximizes the correlation energy showed the most robust and accurate performance of the methods evaluated, even at a low signal-to-noise ratio.

  • 3.
    Nilsson, C M
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Malmqvist, L.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Carlsson, J.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Red fluorescence sensor for noncontact on-line measurements in paper production2001Inngår i: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 40, nr 8, s. 1674-1681Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A robust sensor is developed for on-line measurements in paper production. The sensor is designed for optimal response to lignin in paper. A diode laser operating at 630 nm is used for excitation and fluorescence light in the wavelength region 660 to 740 nm is detected. A compact photomultiplier tube is used for fast detection with a high SNR. The measuring spot is 90 mum in diameter. All optical and electronics components are housed in a small 250X140X90 mm(3) box. Because the system can make up to 1.2 million measurements/s the distance between adjacent measuring points can be as short as about 20 mum, even at a paper speed of 25 m/s, as is common with a modern newsprint paper machine. The recording system can store data continuously for 45 min at this sampling rate and data from three more sensors can be recorded simultaneously with the same resolution. This high-capacity sensor system can monitor the behavior of a paper machine at much higher time and space resolution than has traditionally been possible. From test runs on four different newsprint paper machines we observed the existence of small spots of high fluorescence in the paper from one machine, characteristic behavior with a significantly lower level of fluorescence in periodical sections of about 200 m in another machine, and that wire marks and periodical patterns could be very well identified from the fluorescence recordings. Such data have proven to contain important information for the papermaker concerning, for example the relative shrinkage of the paper web in the drying section of the paper machine. © 2001 Society of Photo-Optical Instrumentation Engineers.

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