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The essential problem of Distributed Virtual Environment (DVE) is to build scalable communication architecture, on which a large number of objects can communicate each other in a dynamical fashion. In this paper, a new XML-based scalable active interest management approach, which applies active routing technique to interest management, is presented to provide a heuristic method to solve the traditional scalability problem in DVE. The new approach uses XML to describe the interest representation model of objects, and implements active package filtering and transmission by XML routers based on the bi-directional shared multicast infrastructure. We developed the prototype system, and performed experiments in campus network. Experimental results show that this approach can prevent hosts from receiving redundant packets, thus efficiently reducing the total traffic in virtual environment. [ABSTRACT FROM AUTHOR]

Wireless Sensors Networks (WSNs) represent a new generation of embedded systems, which deploy wireless ad hoc communication mechanisms to route a sensory data from the originator sensor node to the base station. One of the most important issues in wireless sensor networks is to support real-time QoS, which is fundamentally a challenging problem. In this paper, we introduce EDBP scheduling algorithm for sensor network along with a MAC protocol based on the dynamic priority assignment EDBP. Two different platforms based experiment projects are designed to test our proposal. [ABSTRACT FROM AUTHOR]

The performance of wireless sensor networks depends largely on the deployment of sensor nodes as well as their lifetime mainly determined by the energy consumption. Most current attention, however, has been paid to energy-efficient deployment. With the goal of facilitating further evolution of wireless sensor networks, recently proposed deployment schemes for wireless sensor networks are surveyed. The focus is on coverage and connectivity, which are regarded as the most important respects of network performance and energy-efficiency. Depending on the application and different actions in the network, coverage issues are classified into static and dynamic ones, while connectivity issues into pure connectivity and routing algorithm based connectivity. An overview of each of these areas is presented, and the performance of existing methodologies is discussed. In order to spark new interests and developments in this field, some crucial open issues are pointed out. [ABSTRACT FROM AUTHOR]