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Grid and peer-to-peer technology are widely applied to file sharing system. P2P overlay network topology and search algorithm have always got much attention of researchers. A mismatch between overlay and the Internet infrastructure has critical performance implications in search efficiency. We design a file sharing system named RP(k)C-Grid. It is a hybrid topology overlay network composed of two parts:...
To overcome the common defects of early convergence in the existing genetic algorithm, an improved genetic algorithm with new crossover operator and new crossover strategy was presented for the solution to the vehicle routing problem with soft time window (VRPTW). Experiments show that the improved genetic algorithm can dramatically reduce the number of same or similar chromosomes, and increase the...
In wireless sensor networks, clustering is considered as an effective energy-saving routing technology. In this paper, we proposed an inter-cluster routing schedule for data collection to solve inter-cluster communication problems: make sure the dominating set C produced by clustering algorithm meets the connectivity and constructs a routing pool tree, which can be got by using jump to jump transmission...
Multicast communication is one of the most significant collective communication operations and is highly demanded in data communications and scalable parallel and distributed computing systems. In this paper, we consider the issue of supporting multicast in the far and wide used well-known three-stage Clos network C(N, n, m; f2). We make use of Hwang??s unifying approach and Pattavina and Tesei??s...
The Chord protocol is the best known example of implementation of logarithmic complexity routing for structured peer-to-peer networks. Its routing algorithm, however, does not provide an optimal trade-off between the size of the finger table and the average number of hops to reach destination. Lately, a base-k chord appeared based on the original Chord, the routing perfomence of this system improved...
Wearable computers need networking by using wireless ad hoc network in order to utilize them more effectively, routing protocol becomes an important research field for its significance in wireless ad hoc network. In Ad Hoc network, there are mainly two kinds of routing protocols: proactive routing protocol and on-demand routing protocol, to evaluate the performance of two kinds of protocols, we choose...
P2P workflow systems meet the development trend of workflow systems. The running path optimization (the path with the minimum running time which consists of the services discovery time and the task execution time) in full-distribution (decentralized) environments has been a bottleneck restricting the performance of P2P workflow systems. Aiming at this problem, this paper proposes a innovative hybrid...
Parallel computing is important in modern technology, so is the interconnected network. This paper analyses the architecture of SMP symmetrical multi-processor system, designs a kind of crossbar for small scale multi-processor system basing on the theory of advanced computer architecture. Brings forward the concept of require priority and designs a scheduling algorithm in considering of the priority...
NS2 is an object-oriented simulation tool to simulate and analyze network elements; it is also a powerful tool to develop new protocol and scheme. In the paper, we analyze the features and models of wireless network in details; discuss the simulation process and implementation of wireless network on the basis of NS2. Also, AODV protocol and self-defined MFlood protocol in wireless network are simulated...
Delivery of real time streaming applications, such as voice over IP (VoIP), in packet switched networks is based on dividing the stream into packets and transferring each of the packets on an individual basis to the destination. To study the effect of packet dispersion on the quality of VoIP applications, we focus on the effect of the packet loss rate on the applications, and present a model in which...
Coexistence of multicasting and DiffServ is promising since the DiffServ module can provide a scalable QoS framework and multicasting can save network resources. Although several approaches of multicasting in DiffServ networks have been proposed in recent years, most of them concern only one or two problems that existed in this research area. In this paper, we propose an integrated approach for DiffServ...
Peer-to-peer (P2P) systems have gained considerable attention in the past few years. Since the popularity distribution of queries follows a zipf-like distribution in a P2P network, the performance can get significant improvement if a simple and effective caching mechanism called hot spots caching mechanism (HSCM) is used, which stores the IP address and port number of the successor node of the key...
Chord is the most essential and efficient peer-to-peer routing algorithm that, however, cannot reflect the hot resources problem in practical networks. To solve the problem, an optimized Chord algorithm has been put forward in this paper to accelerate locating the hot resources. The optimized Chord algorithm records the access time of resources and categories the resources into three classes. As for...
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