Change search
Refine search result
123 101 - 105 of 105
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101. Tham, Yiu-Kwok
    Burst assignment for generalized satellite-switched TDMA networks1997In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 8, no 2-4, p. 191-210Article in journal (Refereed)
    Abstract [en]

    A burst assignment problem for satellite-switched time-division multiple access networks is generalized to distinguish traffic requirements of earth stations in a network. This distinction leads to shorter transmission time in general. The satellite provides coverage for u uplink spotbeams and v downlink spotbeams with prescribed limits on the maximum number of available carriers in each spotbeam, subject to a total of K carriers in use at any one time. Earth stations are equipped for simultaneous transmission on and reception of multiple carriers. If u + v is O(K), the number of switching modes required is O(K-2) and a transmission-time optimal schedule can be found in O(K-4) time. Technology considerations are discussed.

  • 102. Tham, Yiu-Kwok
    Generalized satellite beam-switching modes1997In: IEICE transactions on communications, ISSN 0916-8516, E-ISSN 1745-1345, Vol. E80-B(10), p. 1523-1528Article in journal (Refereed)
    Abstract [en]

    Satellite beam-switching problems are studied where there are m up-link beams, n down-link beams and multiple carriers per beam. By augmenting a traffic matrix with an extra row and column, it is possible to find a sequence of switching modes ((0, 1)-matrices with generally multiple unit entries in each row and column) that realize optimal transmission time. Switching modes generated are shown to be linearly independent. The number of switching modes required for an m x n matrix is bounded by (m - 1)(n - 1) + 1. For an augmented (m + 1) x (n + 1) matrix, the bound is then mn + 1. The bounds on the number of switching modes and the computational complexity for a number of related satellite transmission scheduling problems are lowered. In simplified form, the results (particularly the linear independence of permutation matrices generated) apply to algorithmic decomposition of doubly stochastic matrices into convex combinations of permutation matrices.

  • 103. Tham, Yiu-Kwok
    Routing in asymmetrical multiconnection three-stage Clos networks1998In: Networks, ISSN 0028-3045, E-ISSN 1097-0037, p. 77-83Article in journal (Refereed)
    Abstract [en]

    The asymmetrical multiconnection three-stage rearrangeable Clos network is considered, where, in general, many-to-many connections are allowed between input and output terminals. The problem of routing the connections over the switches is efficiently solved. The computational complexity is improved from O(mf(3)) to O(f(4)) using a network flow model for the routing problem, where f is the number of first-stage switches and m is the number of second-stage switches; the number of third-stage switches is assumed to be of the same order as f. Note that the O(f(4)) complexity is independent of the number of second-stage switches. Using an appropriate data structure, the computational complexity of an edge-coloring approach to the routing problem is lowered from O(mK(2)) to O(m(f(2) + K log K)), where K is the aggregate capacity of the interconnecting links between all first-stage switches and a second-stage switch; the aggregate capacity of the interconnecting links between a second-stage switch and all third-stage switches is assumed to be of the same order as K. This makes the edge-coloring approach competitive for small values of m and K. (C) 1998 John Wiley & Sons, Inc.

  • 104. Tham, Yiu-Kwok
    et al.
    Arvidsson, Åke
    Virtual Path Routing for ATM Networks1997Conference paper (Refereed)
    Abstract [en]

    Virtual paths facilitate the rapid movement of end-to-end traffic streams in an ATM network by keeping processing at intermediate nodes en route to the minimum. There may exist, however, some virtual paths in an ATM network with low volumes of traffic on them. Balancing between efficient utilization of transmission resources en route and keeping intermediate switching to the minimum, lightly loaded virtual paths are decomposed into at most two logical hops, which require only one intermediate switching for an end-to-end traffic stream. The decomposition procedure and data structure for efficient implementation are described. For a twenty-node network with between three and four hundred virtual paths, experimental results show that the average number of lightly loaded virtual paths that cannot be decomposed by our procedure is about 6.5. Work in progress and future work lie in simulating network performance and investigating improved network dimensioning techniques for direct and two-hop routes in ATM networks.

  • 105. Toft, Joachim
    An Embedding Result for some General Symbol Classes in the Weyl Calculus1999Conference paper (Refereed)
    Abstract [en]

    The paper deals with inclusion relations between s(p) and H-s(p). Here s(p) is the set of all a is an element ofJ such that the Weyl operator a(w) (x, D) is a Schatten-von Neumann operator on L-2 to the order p is an element of [1, infinity], and H-s(p) is the Sobolev space of distributions with s derivatives in L-p. At the same time we compute the trace norm for a(w) (x, D), when a is an arbitrary Gauss function.

123 101 - 105 of 105
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf