Focus on the problem of design for general platform of microcomputer ' s peripheral circuit , we study the realization of common functions for peripheral circuit based on msp430 series chip of tl company and give a detailed layout and design for the constructing of general design platform , finally we put forward two platform realization methods for both static configuration and dynamic configuration 之后以建设微机外围电路通用化平台为主线，研究了以msp430系列单片机为核心的常用外围电路的功能实现及性能分析，并对通用化设计平台模型的建立进行了详细的规划设计，给出了静态配置和动态配置两种平台实现方式。
According to these work , we design and develop database grid prototype system called griddaen - dai . it adopts java mechanism and integrates database resources in internet , provides uniform logical data views and data access service for grid user at different places . this system mainly adopts multi - domain server mechanism and server - registration mechanism , provides uniform access to many heterogeneous database resources , and has features such as dynamic configuration and scalability . the system is composed of metadata information service ( mis ) , data access service ( das ) , clients and the low - level distributed heterogeneous database resources Griddaen - dai利用java平台无关特性,整合广域环境下分布异构的数据库资源为地理上分布的用户提供了全局的逻辑数据视图和统一的数据访问服务;系统采用分布、独立的多域服务器技术和服务器注册机制,支持对多种异构数据库资源的统一访问,具有动态配置和可扩展性等特征,系统在逻辑结构上主要有元服务、数据访问服务、客户端和底层分布异构的数据库资源等部分组成。
As a result , the framework of object middlewar e to help open implementation and the technology applied to resolve problems mentioned above are one of main research focuses of object middleware . therefore , the primary work of the thesis is mainly about the technology of efficient and flexible object middleware . the main work include the layered framework of object middleware to support open implementation , extensibility and customization , the technology for optimizing implementations of abstract layers of object middleware , the management and deployment environment of distributed objects , and dynamic reconfiguration of object middleware and distributed object systems 针对上述问题，本文的主要工作围绕高效、灵活的分布对象计算环境技术的研究展开，其基本思路是通过分布对象层次抽象模型建立开放实现，支持扩展和定制的分布对象计算环境框架，优化各抽象层次和内部机制的实现，在计算环境中建立灵活的配置结构，提供对请求处理的控制和调度机制，支持分布对象计算环境的动态配置，动态响应资源和环境的变化，满足来自不同领域的不同应用需求。
As the rapid development of computer network technologies , the distributed applications are widely used in various enterprises . distributed computing systems have various advantages , compared with concentrated ones , as the following : collaboration between applications can be reached through interoperating ; performance can be improved through distributed parallel processing ; availability can be promoted by using duplication technology ; scalability can be improved through component and dynamic configuration technologies ; cost - performance ratio can be reached through resource sharing 分布式计算系统相对于集中式系统而言,具有下述优势:通过操作可以提高系统中应用之间的协作能力;通过分布式并行处理可以提高系统的性能;通过复制技术可以提高系统的可用性;通过模块化技术和动态配置技术可以提高系统的可伸缩性;通过资源共享可以提高系统的性能价格比。
