产品图纸异地同步与实时协作设计系统研究

从制造业企业联盟生产实际出发，分析了异地设计、异地制造产品图纸同步与实时协作设计的客观需求，研究了产品图纸异地同步与实时协作设计系统应具有的功能，提出了以虚拟专用网(VPN)为物理平台、基于Web的图纸数据同步更新和基于网络黑板的实时协作设计解决方案，讨论了实现该方案的组成结构及关键技术，总结了该方案的特点。     

构建基于PPP的虚拟专用网（VPN）

本文分析了基于ＰＰＴＰ的虚拟专用网（ＶＰＮ）的构建方案，并讨论了ＰＰＴＰ方案的安全性。     

安全高效的SSL VPN构建方法研究

随着互联网技术和通信需求的迅猛发展,虚拟专用网（VPN）已成为构建专用网的主要方法。与其它虚拟专用网相比,安全套接层虚拟专用网（SSL VPN）由于具有安装简单、能够进行细粒度控制等突出优点,在构建远程访问VPN（Access VPN）时得到了广泛应用。但是,SSL VPN在构建过程中也面临着安全问题和效率问题,这些问题严重制约着SSL VPN的发展。该文在对这些问题进行分析和研究的基础上,提出了全新的SSLVPN安全认证方案和网络加速方案,并推导出配置加速器数目的计算方法。     

虚拟专用网──建立低费用的大型广域网络的新方案

本文介绍了虚拟专用网的原理、实现技术、安全机制、特点及产品，使用虚拟专用网技术可由本地通信线路进入公用Ｉｎｔｒａｎｅｔ／Ｉｎｔｅｒｒｎｅｔ网，利用公用网基础设施作为广域网通信媒体，组建费用低廉的大国广域网络。     

VPN现状与在网区中的部署分析

介绍了虚拟专用网（Virtual Private Networking,VPN)的技术，产品的现状及其实现方式，并就实际组网中的VPN在网区中的部署进行了分析。     

基于EAP与VPN的WLAN安全机制的研究

介绍了基于IEEE 802．11的无线局域网（WLAN）的安全机制,在对其安全性进行分析的基础上,提出了将IEEE 802.lx可扩展认证协议（extensible authentication protocol,EAP）与虚拟专用网（virtual private network,VPN）相结合的方案来构建安全的无线局域网,其中虚拟专用网采用作用于网络层的IPSec方式实现,并展望了无线局域网安全的未来。     

虚拟专用网(VPN)技术

虚拟专用网是Internet的一个全新的应用领域，本文介绍了虚拟专用网的概念、分类和优势。并详细介绍了虚拟专用网的相关协议。     

通过隧道技术建立安全的虚拟专用网

随着INTERNET以及远程接入技术的发展,虚拟专用网（VirtualPrivateNetwork,简称为VPN）成为当前的热点技术之一,受到了人们的广泛关注。文章从安全性的角度出发,描述了VPN的基本概念,主要讨论了通过L2TP（LayerTwoTunnelingProtocol）实现VPN的基本原理,并分析了L2TP与IPsec相结合建立安全虚拟专用网的方法。     

Windows 2000中实现VPN隧道协议的研究与比较

在Windows2000中，提供了两种隧道协议，可以让我们方便的创建虚拟专用网：PPTP（点对点隧道协议）和附带IPSec（网际协议安全）的L2TP（第二层隧道协议）。本文阐述了PPTP与L2TP／IPSec实现远程接入VPN的比较。     

采用VPN技术建立虚拟业务网技术应用分析探讨

主要阐述了VPN虚拟专用网概念,分析了VPN虚拟专用网现状及发展趋势,介绍了VPN虚拟专用网功能及特点,为政府、企事业单位应用VPN虚拟专用网提供参考。     

基于动态制造资源的产品工艺分工规划研究

针对制造企业联盟的产品工艺分工问题,研究并开发了基于动态制造资源的网络化产品工艺分工规划系统。论文阐述了工艺分工的设计方法,提出了逻辑制造单元、逻辑加工路线等新概念,并对产品工艺分工系统的体系结构与功能组成、基于动态制造资源的零件与逻辑制造单元建模方法、基于知识的逻辑加工路线设计及可执行加工路线生成方法进行了详细讨论。     

The implementation of neural network for semiconductor PECVD process

In semiconductor manufacturing, the monitoring system has been developed very excellently and can be used for comprehensively collecting the historical data of process information and quality characteristics of equipment. However, due to the high turnover rate of personnel and the great variance in manufacturing process, the previous control technique by using intuition and experience of engineers for manufacturing process parameter settings to achieve good product quality is no longer appropriate. Therefore, this research establishes a quality predictor for analyzing the relationship between manufacturing process parameter setting and final product quality in the plasma-enhanced chemical vapor deposition (PECVD) of semiconductor manufacturing by applying the back-propagation neural network (BPNN) algorithm and Taguchi method. The experimental data are categorized into 500 pieces of training data and 150 pieces of verifying data. The proposed analysis method for using in the PECVD process of semiconductor manufacturing is verified by comparing the predicted film thickness of SiO₂ and the predicted refractive index of silicon dioxide films with the measured data. According to the comparison result, the proposed model has an excellent prediction capability of final product quality and can be applied in process control for related manufacturing fields.     

产品信息集成中的语义MDA方法

在当前产品制造企业的信息集成过程中,往往采用以产品为中心的概念实施产品生命周期管理（Product Lifecycle Management,PLM）。以企业内部纵向的产品设计系统和销售目录系统为例,基于语义模型驱动架构（Model Driven Model,MDA）建立了两者之间的信息集成方法,并重点讨论了框架中概念层模型的构建方式。最后用实例说明了概念集成模型的内容和作用,并提出了下一步的研究工作。     

制造网格中QoS管理的研究

为了将制造网格技术应用到实际中去，为分布异地的制造企业提供资源共享和协同工作的平台，根据制造业的实际情况，以贯穿整个产品生产过程的产品质量控制为依据，把生产过程中对产品质量的要求延伸为对服务质量的要求，将服务质量的理念和管理方法引入制造网格中，建立制造网格服务质量管理（MG－QoS）系统，提出了一种基于QoS管理的制造网格实际应用的初步解决方案。     

RFID-enabled real-time manufacturing execution system for mass-customization production

Mass-customization production (MCP) companies must fight with shop-floor uncertainty and complexity caused by wide variety of product components. The research is motivated by a typical MCP company that has experienced inefficient scheduling due to paper-based identification and manual data collection. This paper presents an RFID-enabled real-time manufacturing execution system (RT-MES). RFID devices are deployed systematically on the shop-floor to track and trace manufacturing objects and collect real-time production data. Disturbances are identified and controlled within RT-MES. Planning and scheduling decisions are more practically and precisely made and executed. Online facilities are provided to visualize and manage real-time dynamics of shop-floor WIP (work-in-progress) items. A case study is reported in a collaborating company which manufactures large-scale and heavy-duty machineries. The efficiency and effectiveness of the proposed RT-MES are evaluated with real-life industrial data for shop-floor production management in terms of workers, machines and materials.     

Development of an agent-based system for manufacturing control and coordination with ontology and RFID technology

Integrating physical objects with the corresponding enterprise applications any time any where is the essential issue for a real-time enterprise. This study proposes a multi-agent system framework called agent-based manufacturing control and coordination (AMCC) system, a agent-based framework using ontology and RFID technology to monitor and control dynamic production flows and also to improve the traceability and visibility of mass customization manufacturing processes. The capabilities offered by multi-agent systems to respond to RFID events in real-time and a broad class of agent design and coordination issue regarding just in time (JIT) and just in sequence (JIS) manufacturing processes are also exploited in this study. To validate the proposed framework, case study of a bicycle manufacturing company is used to demonstrate how the proposed framework can benefit its JIT production. Finally, an example prototype system is implemented to demonstrate the concept of the proposed framework.     

面向PLM的产品设计资源集成系统

通过分析产品生命周期管理（PLM）的思想并结合制造企业现状和未来发展趋势,设计了面向PLM的产品设计资源集成系统方案。在设计时分别建立实体、功能和流程的模型,并在此基础上建立协同BOM模型、系统集成模型以支持产品导向设计管理,分割流程模型以支持设计各阶段协同管理。通过AOP设计方法建立与模型对应的系统体系架构,实现系统的柔性和持续化发展。     

基于动态MANCOVA的混合制程虚拟测量算法

在晶圆/液晶面板等批次加工过程中,产品质量的及时估计与品质管制是提高产能和降低成本的有效途径.针对"少量多样"的混合制程,利用逐步回归算法挑选该制程的关毽变量,引入产品的效益因子,建立混合制程的虚拟测量模型;为克服系统扰动对模型精度的影响,以产品效益因子为状态量建立该制程的状态方程,利用Kalman滤波器递归估计模型参数得到动态的MANCOVA模型;最后通过某湿式蚀刻制程的工程应用验证了该算法的有效性.     

基于物料清单的制造过程工作流建模

分析了物料清单(BOM)在产品制造过程中的核心地位,提出了将BOM表映射成PETRI网的算法,利用所得到的PETRI网建立了面向制造过程的工作流管理系统的模型。从而允许设计者根据产品的结构而不需要知道实际的过程流程来安排生产任务的自动执行。对于生产作业计划的制订有很好的指导意义。     

A fuzzy-based decision-making method for evaluating product discontinuity at the product transition point

Companies have been striving to achieve product innovation and cost savings to keep up with a rapidly changing manufacturing environment, as well as to deliver new products just in time and earlier than their competitors. Their strategic goals include effective decision making with regard to product life cycles, predicting market demand, and timing new product launches through the optimization of demand and supply of products. However, most products that enter a decline stage experience a decline in sales, which in turn causes an increase in warehouse costs, and a decline in competitiveness, owing to a delay in the release of new products. In this paper, we propose a fuzzy-based decision-making method to effectively evaluate products to be discontinued at the product transition point after taking into account market uncertainties and characteristics of businesses in companies. Therefore, we conduct the matrix analysis and the Pareto analysis for quantitative evaluation of four stages of the product life cycle based on market demand information for target product groups, apply the results of this analysis to the fuzzy-based qualitative evaluation model, and subsequently infer the discontinuity priority for product models that are expected to be replaced by new products. Furthermore, we develop the PTP portfolio system to identify a list of product models to be discontinued, as well as to review their percentage of sales contribution with respect to the overall product sales of the company.