Design and Development of Middleware for Group Communication in Wired and Wireless Networks

在2004年至2006年的研究期间，我们进行了“有线和无线网络中群组通信中间件的设计与开发”的研究。具体而言，我们在各自的年份做了以下研究：（1）在2004年，我们开发了基于Java的中间件组通信的移动的网络环境中，网络拓扑结构随着时间的推移而动态变化。我们还开发了手机中间件，使我们能够轻松地设计和开发手机用户之间的交互式应用程序;（2）2005年，我们将我们的中间件应用于广域网网络监控系统的开发。（3）2006年，为了实现移动的自组网（adhoc network，MANET）环境下的大规模群组通信，设计并实现了一个基于半最优组播树分布式计算和主动路由协议的MANET视频分发系统。对于（1），我们得到的结果是，我们的中间件允许我们轻松地开发交互式应用程序，并且我们的实现可以在一个应用程序中同时容纳超过10，000个手机用户。对于（2），我们证实了我们提出的网络监控系统可以快速识别广域网中的问题区域。对于（3），我们证实了我们的视频分发系统的MANET构造更好的组播分发树比现有的方法，在功耗，树的稳定性，等等。

During the research period from 2004 to 2006, we studied on "Design and Development of Middleware for Group Communication in Wired and Wireless Networks". More specifically, we did the following research studies in respective years : (1) In 2004, we developed Java-based middleware for group communication in a mobile network environment where network topology dynamically changes as time passes. We also developed middleware for cell phones which allows us to easily design and develop interactive applications among cell phone users ; (2) In 2005, we applied our middleware to development of network monitoring system for wide-area networks. In this research, we developed the monitoring system, and conducted evaluation experiments through simulations ; (3) In 2006, in order to achieve large-scale group communication in mobile ad hoc network (MANET) environments, we designed and implemented a video distribution system for MANET which consists of distributed computation of semi-optimal multicast tree and pro-active routing protocol. We also conducted evaluation experiments through simulations.For (1), we obtained the result that our middleware allows us to easily develop interactive applications and our implementation can accommodate more than 10,000 cell phone users at the same time in one application. For (2), we confirmed that our proposed network monitoring system can quickly identify problematic areas in wide area network. For (3), we confirmed that our video distribution system for MANET constructs better multicast distribution trees than existing methods, in terms of power consumption, tree stability, and so on.