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Satellite network has the advantage of global coverage and simple access, so it is considered to be an important part of next generation Internet. In this paper, we propose a network status adaptive QoS dynamic routing algorithm for satellite networks, which is called SADR. It uses heuristic techniques to do the task of dynamic routes searching, routing tables updating and maintaining. In the condition...
This paper focuses on routing algorithm with two quality of service constraints: bandwidth and delay. The former is a concave constraint while the later is additive. The goal of algorithm is to accept as many routing requests as possible. Therefore, the proposed algorithm reactively calculates link weights based on link bandwidths. Then, a heuristic idea is applied to Dijkstra in order to find a path...
The management of resources and scheduling in cloud computing environment is a complex undertaking mainly due to resource's geographic distribution, heterogeneity and dynamic. A Qos guided task scheduling model, being composed of some scheduling strategies and a QoS guided scheduling Sufferage-min heuristic algorithm, is presented. Taking account for not only the resources' properties of dynamic and...
Software as a Service (SaaS) is a software delivery model for application vendors to serve large amount of users with customized services. To meet the different non-functional requirements of different users, multi-tenant SaaS applications must support different QoS level of different tenants. To ensure QoS level while maintaining high resource utilizing efficiency, this paper proposes a user requirement...
Service-Oriented Architecture enables the composition of loosely coupled services provided with varying Quality of Service (QoS) levels. Given a composition, finding the set of services that optimizes some QoS attributes under given QoS constraints has been shown to be NP-hard. Therefore, heuristic algorithms are widely used, finding acceptable solutions in polynomial time. Still the time complexity...
The objective of web services selection is to maximize an application-specific utility function under the end-to-end QoS constraints. Existing methods can be divided into two types: local selection method and global selection method. The local selection method is simple and efficient, but can not meet the end-to-end QoS constraints. The global selection method can satisfy the global QoS constraints,...
In a service-oriented online social network consisting of service providers and consumers, a service consumer can search trustworthy service providers via the social network. This requires the evaluation of the trustworthiness of a service provider along a certain social trust path from the service consumer to the service provider. However, there are usually many social trust paths between participants...
A wireless resource scheduling problem is formulated in the context of IPTV multicasting streaming services over WiMAX channels. The goal is to maximize quality of services, in terms of number of subscribers served, number of IPTV channels carried, and video qualities of individual channels; subject to constraints of finite amount of multicast channel capacities as well as time and spatially varying...
QoS routing and multipath routing have been receiving much attention respectively in network communication. However, the research combining those two kinds of routing is rare. This paper integrated the ideas of QoS and multipath, and presented the problem of shortest pair of disjoint paths with bandwidth guaranteed. we proved it to be NP-complete, and then proposed a heuristic algorithm. The analysis...
Multicast is widely applied for multimedia communications in Internet. The effective multicast routing is the key technology to the communications. The Qos of multi-constrained multicast routing problem deserves more attention. The objective function is to minimize the cost and meet multiple constraints to realize high Qos. The solutions' fitness is obtained by the concentration mechanism of immune...
Service composition becomes the most interesting challenges in the Web services area. In this paper, the quality of service (QoS)-aware composition of Web services is discussed. In the existing work, heuristic or intelligent optimal algorithms are adopted directly upon the complex process model of a composite service, which means different flow constructs (e.g. sequence, selective, simultaneous, combination,...
Service-oriented architecture (SOA) provides a flexible paradigm to dynamically compose service processes from individual services. The flexibility, on the other hand, makes it necessary to monitor and manage service behaviors at runtime for performance assurance. One solution is to deploy software monitoring agents. In this paper, we present an approach to consider agent cost at process composition...
In this study, we investigate the correlation between security and spatial resolution -a measure of service quality- in cluster-based wireless sensor networks (WSN). We analyze the tradeoff between these two concepts resulting from the limited channel capacity. We propose a method based on combinatorial optimization to determine the best tradeoff between security and spatial resolution for cases where...
Notice of Violation of IEEE Publication Principles"Resource Management and Knapsack Formulation in Distributed Multimedia Networks"by Abed Elhamid Lawabni and Ahmed H. Tewfikin IEEE Global Telecommunications Conference (Globecom 2005), pp. 413-418After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found...
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