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Along with the enormous amount of information service resources on the Internet, it is increasingly necessary to consider the urgent problems it has brought, such as diversity, heterogeneity, disorder, and redundancy. Existing service technologies like P2P, grid computing, Web service, and cloud computing, mainly focus on a certain type of service resources, and they do not provide a basic model that...
Transaction scheduling models and control issues are two important problems in a distributed environment. A lot of research has been focused on the problems recently, and many models and measures (such as replication) have been proposed. However, some of them didn't fit for grid environment, as grid architecture is a new and distinguished from conventional distributed computing by its heterogeneous,...
Map service, the most frequently used service in mobile navigation application, is always the bottle-neck due to the continual map refresh, limitation capacity of wireless network and the vast data volume of the vector map. Data prefetching, responsible for fetching data from Map Server forehand, is considered to be an efficient way to increase map refresh. However, the sticking point is to decrease...
The emerging computational grid infrastructure consists of heterogeneous resources in widely distributed autonomous domains, which makes job scheduling even more challenging. In this paper, we propose a novel discrete variant of particle swarm optimization (PSO) algorithm to solve job scheduling problem. In the proposed algorithm, each particle is encoded in a natural number vector and an efficient...
Traffic congestion is a severe problem in urban areas of many countries. The adoption of ITS make commuters' travel convenient but cannot eliminate automobiles from the highways. The existing ridesharing services increase the efficiency of the transportation network but is limited by self-issues. Our approach is a dynamic ride sharing community service architecture combining ITS, ridesharing and social...
Grid computing is innovative information service infrastructure for dynamic and distributed resources sharing and collaboration. Grid workflow is used to handle tasks with control and data dependencies , and plays an important role in grid computing. It is essential to design an appropriate model to satisfy the distributed and heterogeneous workflow systems that must be flexible, reusable, dynamic...
Refinement operation of workflow nets is provided in this paper for modeling and analyzing integrated workflow. Structure, dynamic properties and behavior expression of refined workflow net are also discussed. These works proves that refinement operation with step-by-step refinement of transitions could realize hierarchical modeling of workflow as well as composite modeling of workflow integration...
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