New flexible software platform to overcome ubiquitous NW complexity

在无所不在的时代，要求计算机系统能够顺利地协作/联合。以下是本项目的主要研究成果。(1)LP49：用于联邦处理的操作系统我们正在为嵌入式系统实现一个名为LP49的新的联邦操作系统。最近的嵌入式系统需要各种功能，特别是分布式/联邦处理。LP49将回应这些请求。它的特点是：a)使用L4微内核；b)用户多服务器提供各种操作系统服务；c)基于Plan9的联合处理。(2)操作系统中远程设备访问的研究目标是支持移动环境下的协同处理。移动计算机很常见，但这项研究设计了设备移动性。用户可以使用无线设备（如薄显示器、输入设备）接收来自远程服务器计算机的服务。(3)对象子图复制中间件提高分布式Java程序的效率和可扩展性。泛在协作已经成为一种日常生活模式。传统的复制方案通过将共享应用程序的所有对象复制在一起来应对网络不可靠性，不适合协作应用程序或移动计算。我们的方法采用了一种面向子图的复制，这种复制允许复制部分应用程序对象。实现了一个面向对象的中间件，它能够以透明和随需应变的增量方式动态地部分复制远程共享的Java应用程序。

Computer systems are requested to collaborate/federate smoothly in ubiquitous age. Followings are major research results of this project.(1)LP49 : An operating system for federated processingWe are implementing a new federated operating system named LP49 for embedded systems. Recent embedded systems need various functional capabilities, especially distributed/federated processing. LP49 will answer to these requests. It is characterized by: a) use of L4 micro-kernel, b) user land multi-servers which provide various OS services, c) federated processing based on Plan9. LP49 supports development high-performance embedded systems(2)Study on remote device accessing in Operating SystemsThe objective is to support collaborative processing in mobile environment. Mobile computers are common, but this study has contrived device-mobility. Users can bring about wireless-devices (such as thin monitors, input devices), receiving services from remote server computers.(3)Object sub-graph replication middleware to enhance efficiency and scalability of distributed Java programsUbiquitous collaboration has become an every day life paradigm. The traditional replication scheme copes with network unreliability by replicating all objects of a shared application together, and is not suitable for cooperative applications or mobile computing. Out approach adopted a sub-graph-oriented replication that enables a portion of the application objects to be replicated. An object-oriented middleware is implemented which is capable of dynamically and partially replicating remotely shared Java applications in a transparent and on-demand incremental manner.