船舶管系设计系统的发展和应用

在船舶建造过程中,管道的设计、加工与安装是非常关键的环节。根据数据显示,管道系统的处理和安装所消耗的时间,在全部船舶项目中所消耗的时间中,超过了20%。因为工作的复杂性和生产的单一性,所以在很长一段时间内都比较滞后。在世界范围内,由于海上运输市场的激烈竞争,各个国家都把成本和减少建造周期作为目标。因此,在船舶制造中,除了尽量减少船舶制造的时间与成本之外,减少管道的建造时间与成本,也是船舶制造企业的主要目的。

三维船舶管系设计系统——EF-SPD

计算机辅助设计／制造系统的开发应用直接影响船舶工业的现代化发展进程，为打破国外造船计算机辅助设计系统在我国造船行业的垄断地位，我们开发了具有独立自主版权的计算机辅助管系设计系统。该系统涵盖了从技术设计至生产设计的全过程,并能为生产管理提供基础信息。本系统具有操作方便、实用性强，某些功能优于国内外同类软件的水平，为现代造船设计／制造提供了一个良好的辅助设计工具。

计算机辅助管系设计系统的优化

计算机辅助管系设计系统(简称SPD管系设计系统)是我公司计算机信息研究所自行开发的软件，在使用过程中发现了一些不足或缺陷，本文结合公司QC活动，就消除这些缺陷，提高其使用性能作了详细的论述。

A prototype of workflow management system for construction design projects

A great deal of benefits can be achieved if information and process are integrated within the building design project. This paper aims to establish a prototype of workflow management system for construction design project through the application of workflow technology. The composition and function of prototype is presented to satisfy the needs of information share and process integration. By integrating all subsystems and modules of the prototype, the whole system can deal with design information-flow modeling, emulating and optimizing, task planning and distributing, automatic tracking and monitoring, as well as network service, etc. In this way, the collaborative design environment of building design proiect is brought into being.

Analysis and Design of College Student Information Management System

This paper uses oriented process method to analysis and design the system, using SQL Server 2000 database as the backend database support platform system, using three layer B/S architecture to support, the system provides a good interface and function feature, data have high safety performance, high reliability and low cost, the system can improve the work efficiency of college personnel, improve the efficiency of management, and has a certain practical significance.

A PHEMT Based Wideband LNA for Wireless Applications

This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) Band.The enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy operation.The common source inductive degeneration method is employed here to enhance the gain of amplifier.The amplifier produces a gain of more than 17 dB and noise figure of about 0.5 dB.The lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of amplifier.Agilent Advance Design System(ADS) is used for the design and simulation purpose.Further the layout of design is developed on the FR4 substrate.

Design and Research on Tourism E-commerce Platform

this paper analyzes application status of tourism e-commerce in China and the Existing problems, points out that the construction of tourism e-commerce platform is an important part of the development of tourism electronic commerce. The implementation of all business systems of various tourism enterprise data integration and information integration, the travel industry, all kinds of information resources for collaborative centralized management. By connecting the information management system of scattered all corporate travel value chain, realize the unified operation in the tourism e-commerce platform, improve the exchange of information and online transaction speed. According to our country＇ s tourism status and characteristics, from the feasibility analysis, function analysis, performance analysis and service oriented thought, this paper analyzes the system architecture of and data flow diagrams, system flow chart, PAD chart analysis of the system＇ s business processes. And it was analyzed and discussed briefly from the aspects of adaptability, functions, implementation strategy.

Review and Prospective on Systems Engineering in China

The origin,formation and evolution of the systems engineering theory accompanied QIAN Xuesen's whole life.The systems engineering theory is the concentrated reflection of QIAN's achievements and theory in all aspects.From returning to China to pioneer China's space industry,creating a new management mode of "one overall design department,two command lines",publishing Organization and Management Technology:Systems Engineering,to proposing the theory of Open Complex Giant System(OCGS) and the theory of Metasynthetic Wisdom,all these mark the formation of the Chinese school of systems engineering.Guided by QIAN's academic ideas,various major Chinese space programs have been implemented successfully which verified the fact that the systems engineering is scientific.The systems engineering has been applied to different fields of the national economy and has a development process with the distinguished characteristics of Chinese systems science.On one hand,the systems engineering is put forward deeply along the traditional systems engineering thought and theory;on the other hand,a batch of innovations that break the traditional shackles have occurred,making the Chinese systems engineering unique and outstanding compared with foreign counterparts.