Computer-based Applications--论文代写范文

51Due论文代写平台assignment代写范文:“Computer-based Applications”，这篇论文主要描述的是随着现代网络科技的不断进步，网络的应用使用也在不断的普及，在工业领域也开始利用网络应用技术来构建工业结构分析和设计，这种结构化的工业系统已经被人们所研发并有着数年的应用历史，但网络语言的变更周期过快，我们需要采用最新的面向对象语言来开发新的应用程序。

The existing methodology used primarily in industry today in building computer-based applications is known as structured analysis and design. This methodology came into existence as a result of the structured programming techniques introduced in the 1970's. This structured systems development methodology (SDM) has been fine-tuned and used for many years in the real world. However, during the last several years object-oriented languages have become increasingly more popular and more widely used in industrial organizations as well as university institutions. As this trend continued a methodology was developed to assist the programmer with the development of applications using object-oriented languages. This methodology has become known as object-oriented analysis and design (OOAD).The OOAD strategy approaches the problem from an object perspective as opposed to a functional perspective, which is the primary focus of the traditional structured development methodology. During the last few years the increasing use of OOAD over the traditional structured development methodology has spread significantly. As newer and more sophisticated object-oriented languages are created, there appears to be an even greater need for an object-oriented approach to develop business applications. However, does this need warrant greater use of this new methodology over the traditional one? We will compare the two methodologies and their advantages and disadvantages in order to address this problem.

传统系统法系与设计 TRADITIONAL SYSTEMS ANALYSIS & DESIGN

The systems development life cycle (SDLC) or the structured systems analysis & design methodology (SSAD) is a framework of activities and tasks that need to be accomplished to develop an information system. This methodology as mentioned previously is called the waterfall model as each major phase of the methodology flows downward into the next phase (Wu and Wu, 1994). Consequently, this methodology is a strategy consisting of various techniques, tools, documentation and tasks that need to be integrated in order to develop the system. The SSAD is based on the concept of functional decomposition where the analyst breaks down the system into the basic processes that make it up and then breaks these down into smaller ones and so on until the analyst understands all the essential components of the system being investigated (Senn, 1989). The basic principles of the SSAD methodology can be summarized as follows:

This methodology requires that the user be involved from the beginning to the end of project development. The analyst will meet with the user regularly to resolve problems and validate the user's needs. This also requires that the analyst possess highly developed communication skills.

The first principle of SSAD is top down functional decomposition. Here the system is considered in its entirety where the analyst first tries to understand the key features of the system, ignoring the smaller details until later.

Next the scope of system is defined where the physical details of the existing system are analyzed. The analyst focuses on two objectives: what the new system should do and how it should do it.

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