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Träfflista för sökning "LAR1:ltu ;srt2:(1990-1999)"

Sökning: LAR1:ltu > (1990-1999)

  • Resultat 71-80 av 6911
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71.
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76.
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77.
  • Acharya, Soam, et al. (författare)
  • Characterizing user access to videos on the World Wide Web
  • 1999
  • Ingår i: Multimedia computing and networking 2000. - Bellingham, Wash : SPIE - International Society for Optical Engineering. - 0819435872 ; , s. 130-141
  • Konferensbidrag (refereegranskat)abstract
    • Despite evidence of rising popularity of video on the web (or VOW), little is known about how users access video. However, such a characterization can greatly benefit the design of multimedia systems such as web video proxies and VOW servers. Hence, this paper presents an analysis of trace data obtained from an ongoing VOW experiment in Lulea University of Technology, Sweden. This experiment is unique as video material is distributed over a high bandwidth network allowing users to make access decisions without the network being a major factor. Our analysis revealed a number of interesting discoveries regarding user VOW access. For example, accesses display high temporal locality: several requests for the same video title often occur within a short time span. Accesses also exhibited spatial locality of reference whereby a small number of machines accounted for a large number of overall requests. Another finding was a browsing pattern where users preview the initial portion of a video to find out if they are interested. If they like it, they continue watching, otherwise they halt it. This pattern suggests that caching the first several minutes of video data should prove effective. Lastly, the analysis shows that, contrary to previous studies, ranking of video titles by popularity did not fit a Zipfian distribution.
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78.
  • Addie, Graeme R., et al. (författare)
  • Design, selection, sizing and control considerations for cyclone feed slurry pumps
  • 1999
  • Ingår i: Powder Technology. - 0032-5910 .- 1873-328X. ; 104:3, s. 233-239
  • Tidskriftsartikel (refereegranskat)abstract
    • Cyclone feed centrifugal slurry pumps in semi-autogenous grinding (SAG) mill and other cyclone feed circuits see coarse size slurries at high concentrations that can result in high wear if the pump is not designed, selected, sized and operated correctly. The high proportion of static head of the normal cyclone feed circuits usually results in a relatively flat system curve which in conjunction with the typically flat slurry pump curve results in large changes in operating flow with small changes in system head. When this is combined with the normal (or abnormal) fluctuations in the output from the mill upstream of the pumps, any shortcomings in the pump control system and/or matching of the pump means large fluctuations in flow and increased wear. This difficulty could be corrected by continuous variations in speed. A means of control by which the speed is changed in an appropriate way is suggested here. In this case then the pump-input power, the known water performance of the pump and the system flow, can be used to calculate an effective pump discharge pressure. By comparison with a calculated system head, the pump speed can be regulated such that the pressures are equal and the system stable for any practical variation of incoming flow or specific gravity.
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79.
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80.
  • Adolfsson, Stefan, et al. (författare)
  • Automatic detection of burn-through in GMA welding using a parametric model
  • 1996
  • Ingår i: Mechanical systems and signal processing. - : Elsevier BV. - 0888-3270 .- 1096-1216. ; 10:5, s. 633-651
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper addresses the problem of automatic detection of burn-through in weld joints. Gas metal arc (GMA) welding with pulsed current is used, and welding voltage and current are recorded. As short-circuitings are common between the welding electrode and the work piece during burn-through, a short-circuit detector is developed to detect these events. To detect another specific characteristic of burn-through - this detector is combined with a square-law detector. This second detector is based on a non-linear modification of an autoregressive model with extra input (ARX-model) of the welding process. The results obtained from this compound detector indicate that it is possible to detect burn-through in the welds automatically. The work also indicates that it is possible to design an on-line monitoring system for robotic GMA welding.
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