1,720,986 research outputs found
An Optimal Bandwidth-Negotiation Algorithm for Remote Bridging of FDDI Networks Across B-ISDN,
No full textA two-level bandwidth negotiation algorithm used in fiber distributed data interface (FDDI) bridges to obtain a dynamically adaptive bandwidth in the wide area backbone is analyzed and optimized. On the basis of a set of reasonable assumptions on the features of asynchronous transfer mode (ATM) networks, it is shown how cross-connection costs can be optimized if steady-state user behavior is assumed. The extensive results show that the investigated policy can provide significant connection-cost savings. The results are obtained by numerically solving an analytical model, which has also been validated by simulatio
A simulation study of cellular systems based on the Capture Division Packetized Access (CDPA) technique
No full textA new method for achieving spectrum reuse in cellular systems, called capture-division packetized access (CDPA), has been introduced by Borgonovo, Fratta and Zorzi (see Proc. of ICCC Wireless Computer Networks '94, The Hague, Netherlands, Sept. 1994). The method is based on packet switching and uses a single frequency in all cells. Mobiles belonging to the same cell transmit packets using C-PRMA, a polling-like mechanism. Simultaneous transmissions in different cells are made possible by the “capture” capability. Packets that are not captured are almost immediately retransmitted, thus assuring that they are eventually correctly received. Previous analytical works show that CDPA throughput presents a potential gain over classical schemes as FDMA with a 7 cell reuse pattern. We present a simulation model of a cellular system which uses the CDPA technique to accommodate the traffic generated by continuous traffic sources, uniformly scattered over the cellular area. The results encourage one to go ahead in the investigation of the viability of the CDPA approac
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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