1,721,007 research outputs found
Ad Hoc Networks: A Protocol for Supporting QoS Applications
No full textA delay-bounded service in wireless ad hoc networks is challenging, as ad hoc networks do not provide any type of guarantees. Several protocols have been proposed to support applications without timing requirements in ad hoc networks, but the increasing demand of QoS applications, in ad hoc wireless environments, requires delay-bound service. The contribution of this paper is to propose a protocol that provides QoS service, by means of timing guarantees, to the supported applications in ad hoc wireless networks
Design and Analysis of RT-Ring: a protocol for supporting real-time communications
No full textDistributed applications with quality of service (QoS) requirements are more and more used in several areas (e.g.,automated factory networks, embedded systems, conferencingsystems). These applications produce a type of traffic with hardtiming requirements, i.e., transmissions must be completedwithin specified deadlines. To handle these transmissions, thecommunication system must use real-time protocols to provide acommunication service that is able to satisfy the QoS requirements of the distributed applications. In this paper, we propose a new real-time protocol, called RT-Ring, able to support transmissions of both real-time and generic traffic over a ring network. RT-Ring provides both network guarantees and high network resource utilization, while ensuring the compatibility with the emerging differentiated service architectures. Network guarantees are fully proved and high network utilization is highlighted by a comparative study with the FDDI protocol. This comparison shows that RT-Ring network capacities are greater than the corresponding FDDI capacities. In fact, by assuming the FDDI frames with a length equal to the RT-Ring slot size and by using the same traffic load we show that the capacities of FDDI are equal to the lower bound capacities of RT-Ring
Design and Analysis of RT-Ring: a protocol for supporting real-time communications
No full textReal-time applications, such as process control signals and multimedia transmission, are more and more deployed in current networks. These applications produce a type of trafic with stringent timing requirements whose transmission is critical as it has to be completed within its deadline. This can be performed only using protocols that support real-time trafic transmissions. In this paper we propose a new real-time protocol, called RT-Ring, able to support transmissions of both real-time and generic traffic over a ring network. RT-Ring provides both network guarantees and high network resource utilization, while ensuring the compatibility with the emerging Differentiated Service Architecture. Network guarantees are fully proved and high network utilization is highlighted by a comparison study with the FDDI protocol. This comparison shows that RT-Ring network capacities are greater than the corresponding FDDI capacities
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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