维护软件

As a result, it is beneficial to the consistence maintenance of software products.

1概述在软件开发过程中，随着软件规模的增加和开发人员的流动，软件的维护工作变得日益困难。

District Court for the District of Nevada by presenting counterclaims alleging copyright misuse, defamation, disparagement, trade libel, and unfair competition under the California Business and Professions Code.

Rimini Street是一家领先的第三方企业软件维护和支持服务提供商，可支持甲骨文公司的Siebel、PeopleSoft，以及JD Edwards软件和SAP AG软件等。

We adopt distributed and multicenter form in hardware, and in software, use Visual Basic language and Measurement Studio language, adopt module and gradational way of software integration, So, the maintainability of software is improved and development period is shorted.

在硬件方面采用了分布式、多通道的搭建形式，而在软件方面则使用了Visual Basic和Measurement Studio语言并采用模块化、层次化的软件集成方式，提高了软件的可维护性，缩短了开发周期。

Support software is a series of software, which support development and maintenance of other software .

支撑软件是支撑其它软件的开发与维护的一系列软件。

This paper introduces SAIS, An Integrated Rule-based System for Analysis of Software Sructure, which is designed to provide partially support to software maintenance and reverse-engineering activitie.

本文介绍了SAIS，一个基于规则的软件结构分析集成系统，它被设计用于提供对软件维护和软件逆向工程活动的部分支撑。

The research work of this paper is divided into five parts: The first ,according to the work characteristics of ship's auxiliary boiler, this paper is to design applied project in the automatic control system of ship's auxiliary boiler; The second, according to the work request of the cargo winch of alternating three-speed change-pole speed-adjusting, this paper is to determine adopting the method of the PLC control; The third, this paper is to design PLC application in three -phase induction motor control, to give the ladder chart, program and input and output circuit diagram; The fourth, this paper is to research the method of the ship's combined starting screen automatic control with the PLC; The fifth, this paper is to inquire the possibility of apply the PLC in ship's engine room surveillance system; According to the comprehensive analysis of above actual example of ship's auxiliary machinery automatic system with the technique of PLC; not only can use the technique of PLC to replace traditional relay-contactor control technique in ship's auxiliary machinery automatic system, but also can get the conclusion of the former is more dependable and more clever than the latter, the maintenance is more convenient, thus develop a new path for ship automation.

本文研究的工作主要包括五个部分：第一，根据船舶辅锅炉的工作特点，设计PLC在船舶辅锅炉自动控制系统中的应用方案，主要有PLC选型及输入输出点的设计，画出系统控制梯形图并分析工作原理；第二，根据交流三速变极调速起货机的工作要求，确定采用PLC控制的方法，进行控制系统的硬件设计和软件设计，并分析工作原理：第三，设计了PLC在三相异步电动机控制中的应用，给出了控制梯形图、程序及输入、输出接线图；第四，研究了用PLC实现船舶组合起动屏自动控制的方法，进行了系统的电源设计和软件设计，给出系统工作流程图；第五，探讨了船舶机舱监视系统应用PLC的可行性，将继电器报警线路改为用PLC控制报警，给出系统硬件图和软件梯形图，并分析了PLC机的选型、抗干扰和应用PLC的经济效益和社会效益等问题。综合以上船舶辅助机械自动控制系统采用PLC技术的实例分析，可以得出船舶辅助机械自动控制系统不但可以使用PLC技术取代传统的继电器接触器控制技术，而且前者比后者更可靠、更小巧，维护保养更方便的结论，从而为船舶自动化开辟了一条新的路径。无忧毕业设计网 www.5ubs.cn

Software reuse is one of the important fields of computer research.,integrating with software reuse,distribute computing,CASE and enterprise application programming ,CBD(Component Based Software Development) becomes An effective way to increase productivity and quality of software for their distributiveness ,high scalability ,deployability ,effectiveness and easy maintenance .

集软件复用、分布式对象计算、CASE和企业级应用程序开发等技术为一体的基于构件的软件开发以其分布性、高伸缩性、可配置性、高效性、易维护性等优点成为提高软件生产效率和产品质量的现实有效的途径。

Interprocedural dataflow analysis is used for software optimization, maintenance, and testing.

过程间数据流分析在软件优化，软件维护，软件测试中均有大量的应用。

But it is easily noticed that certain activities, such as the maintainance and reengineering of the software, the modernization of the code written before, remain problems unsolved in this field. The solution of these problems largely depends on the programm-intepretaion, namely, to reconstruct the demain model and to document with new characteristics through the analyzation (black- or white-box, static or dynamic) of the old code by using advanced tools.

但我们也能很容易的发现软件维护、遗留代码的现代化改造以及软件的再工程问题等都是软件界普遍关注的话题，以上这些问题的有效解决很大程度上依赖于程序理解，即利用现代化分析工具或者转化系统对遗留代码进行白盒/黑盒、动态或者是静态分析，提取信息，获取抽象描述，从而达到重构具有现代意识的各类文档和领域模型。

Against the limitations of the current software fault location, a new method based on checking codes is presented.

随着计算机技术的发展和软件应用领域的扩展，由软件故障而引发的软件维护等一系列问题逐步引起人们的重视。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。