But as the difference character between the mobile computing and the traditional distributed environment , the technique for distributed database ca n ' t be used in mobile database completely 移动计算环境相对于传统的分布式计算环境具有了新的特点，使得传统的分布式数据库中的技术不能完全的应用到移动数据库中。
Along with the fast and fierce evolution of the internet , the need for open applications become more and more great , because internet itself is a distributed calculating environment of high degree openness 随着internet的迅猛发展，要求具有高度开放性特点的应用需求越来越大，因为internet本身就可看作是高度开放的分布式计算环境。
Combined with the development of the distributed computation environment and the reusable software technology , the internal defaults and limitations of traditional application software with the centralized structure are first analyzed 结合分布式计算环境与软件可重用技术的发展，剖析了传统的集中式结构的应用软件所存在的缺陷和局限性。
The core of setting up the distributed computation environment is the data transfer bus . the requests are sent to the server though the bus . and the server sent the results of computation back to the end of client though the same bus 建立基于corba的分布式计算环境的核心是系统的软件总线，客户通过软件总线向服务器发出请求，服务器通过软件总线将计算结果返回到客户端。
We used mobile agent and web services as distributed computing model and distributed application integration framework to solve the bottom distributed computing environment of work flow system and to integrate with other web applications 分别采用web服务技术和移动代理技术作为分布式计算模型和分布式应用集成框架，从而解决工作流系统的底层运行的分布式计算环境和与其它web应用集成标准问题。
Distributed computer monitoring system is a kind of typical distributed computing environment . it has common features of distributed structure . at the same time , because of monitoring system ' s peculiarity it also has many problems needed to solve 分布式计算机监控系统是一个典型的分布式计算环境，它不但具有一般的分布式结构的特征，同时由于监控系统自身的特点，使得分布式计算机监控系统还存在许多亟待解决的问题。
Orb product by inprise company , as intermediate to construct distributed computation emironment based on corba software . adopt access data base to administer the related data . choose c + + builder and java as pre - developing tools 主要工作包括：选用inprise公司的orb产品visibroker作为中间件构建基于corba的分布式计算环境，采用access数据库管理相关数据，选择c + + builder和java作为前端开发工具，后台服务程序采用fortran编写，接口语言为idl ，图形仿真采用opengl 。
With the continuous developments and extensive applications of technologies in the fields of both mobile communication and computer network , mobile computers can access kinds of network at any time and any place to get the data information they need in the near future . this special distributed computing environment is called mobile computing 随着移动通信技术和计算机网络技术的不断发展和广泛应用，在不久的将来，移动计算机可以在任何时间、地点接入各类网络，以获取所需的数据信息，这种特殊的分布式计算环境被称为移动计算。
The grid resource management system is the important component in grid computing system . it resembles the traditional resource management systems under distributed computing environment and cluster computing environment , supporting three functions : job management , task schedule and resource management 网格资源管理系统是网格计算系统的重要组成部分,从为用户提供方便、高效的服务的角度来看,它与传统的分布式计算环境或集群计算环境下的资源管理系统类似,应当至少具备三种功能:作业管理、任务调度和资源管理。
The synchronization and replication is also an essential technology of mobile database . comparing trade distributed database environment , mobile computing environment has characteristics of high frequency disconnection , network condition diversity , network communications dissymmetry and so on 移动计算环境与传统的分布式计算环境相比有频繁的断接性、网络条件的多样性以及网络通信的非对称性等特点,这些特点使得传统的分布式数据库技术不能有效支持移动计算环境。
