分布式系统

Besides,the structure of the system for implementing the security management system in the client/server environment is also presented. The adoptability,ease usability and maintainability are primary characters of the method. The system also has properties of simple authorization and sound granularity control under the distributed environment.

此外，本论文还提出了客户机/服务器环境下实现安全管理系统的系统结构，该方法具有适应性强、使用方便、易于维护等特点；本系统还具有分布式环境下授权简单、较好地控制了授权粒度等特点。

This paper introduces the development situation and trend of project management system in collaborative design at home and abroad.

本文在介绍了协同设计中项目管理系统的国内外发展状况及趋势的基础上，结合B/S结构的特点，提出了一个开放性的、分布式的协同设计系统框架，并对该系统的层次结构进行了详细分析。

The user's utility is a function of his data throughput, thus the bandwidth resource utilization problem is modeled as a utility based constrained maximization problem, called a system problem.

通过设置站点吞吐量的对数效用函数，将带宽资源的有效利用问题建模为系统效用最大化问题；应用最优化理论将此系统问题等效为可分布式求解的用户问题，即各站点只须独立选择最大化其净效用的竞争参数，则系统整体效用也获得最大化。

With the continuous development of computer science and technology, the application systems in the future will be multilayer ones based on the object oriented, distributed, isomerous conditions. This kind of system is composed of distributed objects one by one, which have given functions singly. These objects are independent of network protocols, programming languages, and software and hardware platforms. These pro- perties make them communicate each other and work corporately.

随着计算机科学技术的不断发展，未来的应用系统将主要是建立在面向对象的、分布的、异构的、自治的环境中的多层应用系统，系统主要由一个个分布式对象组成，对象各自具有特定的功能，可以跨越平台，独立于网络协议、编程语言和软硬件平台，实现相互通信，协同工作。

With the rapid development of computer ,micro-electronics and network, embedded system has been widely applied in the national defence, industry, medical treatment,etc.lt is very meaningful and important to develop a general platform, which is an integrated production of embedded control, signal processing and network communication, and provide a programmable hardware interface and a friendly interface, which can improve networking flexibility, system reliability and developability.

随着计算机技术、微电子技术和网络技术的飞速发展，嵌入式系统在国防、工业、医疗等诸多领域的应用越来越广泛。研制一个集嵌入式控制、信息处理和网络通信于一体，且提供可编程的硬件接口和友好的软件开发界面的通用平台，对于提高分布式测控系统的组网灵活性、系统可靠性和可开发性都具有重要的意义。

The sluice-gate control system is a SCADA system (data capture 、 data surveillance and data control), the functions of which are to capture, monitor and control the central data , capture data digitizedly and distributively , transmit data gradedly , display in multiple modes , and so on . The system makes the process of opening and closure of the sluice-gate simple, convenient, flexible and stable . It can discharge reasonably by using the fewest mechanical and electronic devices , and attain the best effect of the intellectual SCADA system in the loading capability of the sluice-gate .

闸门监控系统是一个可进行中央数据采集、监视和控制的，集数字化、分布式数据采集，分层数据传输，多种显示方式等功能于一身的SCADA系统，使得闸门启闭过程更加简捷、方便、灵活、可靠，功能更强大，从而达到使用最小的机电设备与能耗，获得最合理的排放，并充分发挥计算机智能SCADA系统对闸门运载能力的最佳效果。

According to the characteristics of distributivity and heterogeneity of supervision and monitoring systems at cascade hydropower stations, this paper puts forward a CORBA/Java based monitoring system model for cascade hydropower stations.

根据流域梯级电站监控监测系统的分布式和异构的特点，提出了一种基于 CORBA/ Java技术的流域梯级电站监控系统模型，简要介绍了该系统的结构、特点及软件开发的主要步

The system was carried out with the objective ofdesigning a widespread use system which is independent of the concretetypes and use of naval and merchant ship and can be also applied toother military and industrial real-time control systems.

从技术发展观点看，它是光纤通信技术和微处理机技术相结合的网络通信系统；从应用角度看，它是满足在恶劣环境中以过程控制为目的的军事实时控制系统，由于系统中所有终端设备都带有计算机，因而从软件角度看，它是用光纤总线网络互连的集中控制的分布式计算机系统。

In order to overcome the above-mentioned gaps of the Client/Server computing model of the current GIS, this research introduces Agent technology originated from Artificial Intelligence to GIS. The thesis proposes a new kind of Agent - GeoAgent and expatiates upon its characteristics, behaviors and architecture of corresponding GeoAgent System. A GeoAgent prototype system has been implemented, based on IBM Agent Software Development Kit Aglets. And then, this research proposes GeoAgent-based Geospatial Information Services, followed by detailed theoretical analysis.

针对现有地理信息系统在分布式计算模式方面的不足，本文引入了人工智能领域中Agent的理念，提出了GeoAgent的概念；系统地阐述了GeoAgent的特点、行为、优势和结构，以及GeoAgent系统的体系结构；利用IBM的开发平台Aglets，设计并实现了相应的系统原型；在此基础上，本文提出了基于GeoAgent的空间信息服务的理念，并详细分析了这种空间信息服务的特点和优势。

IThe final product of mis task is based on C/S management system of database with a three-tiered structure of database, application and client.

对于数据的安全性本系统也给予了充分的考虑。本系统最终产品是一个基于C／S的分布式数据库管理系统。系统设计成数据层、业务层、客户层三个结构。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐