STEP-NC based high-level machining simulations integrated with CAD/CAPP/CAM

With the development of manufacturing,numerical control(NC) machining simulation has become a modern tool to obtain safe and reliable machining operations.Although some research and commercial software about NC machining simulations is available,most of them is oriented for G&M code.It is a low-level data model for computer numerical control(CNC),which has inherent drawbacks such as incomplete data and lack of accuracy.These limitations hinder the development of a real simulation system.Whereas,standard for the exchange of product data-compliant numerical control(STEP-NC) is a new and high-level data model for CNC.It provides rich information for CNC machine tools,which creates the condition for an informative and real simulation.Therefore,this paper proposes STEP-NC based high-level NC machining simulations solution integrated with computer-aided design/computeraided process planning/computer-aided manufacturing(CAD/CAPP/CAM).It turned out that the research provides a better informed simulation environment and promotes the development of modern manufacturing.     

Multi-agent graphical games with input constraints: an online learning solution

This paper studies an online iterative algorithm for solving discrete-time multi-agent dynamic graphical games with input constraints. In order to obtain the optimal strategy of each agent, it is necessary to solve a set of coupled Hamilton-Jacobi-Bellman (HJB) equations. It is very difficult to solve HJB equations by the traditional method. The relevant game problem will become more complex if the control input of each agent in the dynamic graphical game is constrained. In this paper, an online iterative algorithm is proposed to find the online solution to dynamic graphical game without the need for drift dynamics of agents. Actually, this algorithm is to find the optimal solution of Bellman equations online. This solution employs a distributed policy iteration process, using only the local information available to each agent. It can be proved that under certain conditions, when each agent updates its own strategy simultaneously, the whole multi-agent system will reach Nash equilibrium. In the process of algorithm implementation, for each agent, two layers of neural networks are used to fit the value function and control strategy, respectively. Finally, a simulation example is given to show the effectiveness of our method.     

An optimal online algorithm for halfplane intersection

The intersection of N halfplanes is a basic problem in computational geometry and computer graphics,The optimal offline algorithm for this problem runs in time O(N log N).In this paper,an optimal online algorithm which runs also in time O(N log N) for this problem is presented.The main idea of the algorithm is to give a new definition for the left side of a given line,to assign the order for the opoints of a convex polygon.and then to use binary search method in an ordered vertex set.The data structure used in the algorithm is no more complex than array.     

Analysis of the virtual enterprise partner selection based on multi-agent system

Today, virtual enterprise is regarded as the most competitive management model of enterprises that faces the resource of the globe. This paper proposed an instructor of remote manufacturing system supporting dynamic alliance for virtual enterprises with the multi-agent technology to solve the problem of partner enterprise selection. Grounding on the virtual enterprise＇s cooperation framework, a model was given and in which we analyze the collaboration relation among different agents. The negotiation model will reduce the time and improve the efficiency of negotiation, so the appropriate partner can be selected in a short time.     

Monitoring Grinding Wheel Redress-life Using Support Vector Machines

Condition monitoring is a very important aspect in automated manufacturing processes. Any malfunction of a machining process will deteriorate production quality and efficiency. This paper presents an application of support vector machines in grinding process monitoring. The paper starts with an overview of grinding behaviour. Grinding force is analysed through a Short Time Fourier Transform (STFT) to identify features for condition monitoring. The Support Vector Machine (SVM) methodology is introduced as a powerful tool for the classification of different wheel wear situations. After training with available signal data, the SVM is able to identify the state of a grinding process. The requirement and strategy for using SVM for grinding process monitoring is discussed, while the result of the example illustrates how effective SVMs can be in determining wheel redress-life.     

A glance of technology efforts for design-for-manufacturing in nano-scale CMOS processes

This paper overviews design for manufacturing （DFM） for IC design in nano-CMOS technologies. Process/device issues relevant to the manufacturability of ICs in advanced CMOS technologies will be presented first before an exploration on process/device modeling for DFM is done. The discussion also covers a brief introduction of DFM-aware of design flow and EDA efforts to better handle the design-manufacturing interface in very large scale IC design environment.     

Business Architecture： A Case Study of a Medium Enterprise in Mexico

Enterprise architecture is a subject that has increased its importance in the small and medium enterprises in the manufacturing sector of the industry in Mexico. The global competitiveness of the markets has influenced the adoption of methodologies that support the strategic alignment of the processes with the goals and strategic objectives of the firms. The components of the business architecture like mission, vision, strategic objectives, products, organizational structure, business prdcesses, clients and geographic region, were collected from the firm of the case study for the design of the architecture. As a result of the practical application, an implementation model has been created and four strategic objectives were established for to improve productivity and competitiveness. This paper is a result of the architecture in a medium size manufacturing company like partial research project of analysis, design and implementing business architecture of an enterprise using ontologies for representing the core elements of the business architecture; the study presents clearly the importance of the strategic planning for the analysis and the detection of the main faults for the success of the achievement of goals and objectives.     

Magic Sets Revisited

This paper distinguishes among three kinds of linear recursions:canonical strongly linear recursion(CSLR),non-interdependent linear recursion(NILR)and interdependent linear recurstion(ILR)and presents an optimal algorithm for each.First,for the CSLRs,the magic-set method is refined in such a way that queries can be evaluated efficiently.Then,for the NILRs and ILRs,the concept of query dependency graphs is introduced to partition the rules of a program into a set of CSLRs and the computation is elaborated so that the oplimization for CSLRs can also be applied.     

Integration of manufacturing services into virtual environments over the internet

Virtual reality (VR) is a rapidly developing technology that has a wide spectrum of industrial and commercial applications. Networked (distributed or shared) virtual environments (VE) are of growing interest to modern manufacturing industry; a dominating use of networked virtual manufacturing environments (VMEs) is on-line visualisation and collaborative control of 3D information. This has to be supported by real-time data transfer. To meet a broad range of common requirements for Internet-based VE communications, particularly for virtual manufacturing and collaborative design and control, this paper presents a networked virtual environment system that is designed to support networked virtual design and manufacturing. The system is implemented with manufacturing message specification (MMS) standards so as to integrate a range of manufacturing services into networked VEs over the Internet.     

Topological structure and optimal control of singular mix-valued logical networks

This paper introduces singular mix-valued logical networks and singular mix-valued logical control networks. Via semi-tensor product, a singular mix-valued logical network can be converted to an algebraic form. On this basis, the normalization problem and solvability are discussed. Then, fixed points and cycles of singular mix-valued logical networks are also studied. Furthermore, the optimal control problem of singular mix-valued logical control networks is presented and a necessary condition for the existence of the optimal control is supplied, based on which, an algorithm is provided. Illustrative examples are given to show the feasibility of the results.     

基于Agent技术的敏捷虚拟企业信息系统的结构及其原型系统研究

在分析敏捷虚拟企业定义、特征的基础上，提出了基于Agent技术的敏捷虚拟企业信息系统框架结构，并证明智能体技术在构建敏捷虚拟企业信息系统中的有效性。     

Web Service在动态联盟中的应用

本文在讨论了Web Service和动态联盟的特性的基础上，设计了一个基于Web Service的动态联盟结构。采用Web Service构造的动态联盟系统具有系统建构周期短、易于维护、易于操作、便于系统集成等优点，从而大大提高了动态联盟的效率。     

敏捷虚拟企业中基于CORBA的多级代理建模

敏捷制造虚拟企业（Agile Virtual Enterprise,AVE）作为一种新型的制造模式正在逐渐兴起。将CORBA技术应用到制造业中，根据制造业自身的特点，提出了分布式制造系统的多级代理模型。在该模型中，代理表示虚拟组织中某一功能部件或任务执行点；工作流表示代理之间相互依赖的关系；事件触发机制实现代理之间的互操作。由此，虚拟组织的运作和产品的协同开发就有了可靠的实现依据 。     

An approach to partner selection in agile manufacturing

It is believed that agile manufacturing is the twenty-first century manufacturing enterprise strategy and should be realized by agile virtual enterprise (AVE) which is dynamically configured for the manufacturing of one or more products. Agile manufacturing creates a significant challenge for the partner selection in configuring an AVE. This paper presents a brief introduction to the task decomposition for the manufacturing of a product in multisite environment. A bidding process should be carried out for each task so as to get the information necessary for the configuration of AVE. To minimize the manufacturing cost, an integer programming (IP) formulation is presented for the partner selection problem. The IP formulation is then transformed into a graph-theoretical formulation by taking the advantage of the precedence relationship between the tasks. The graph obtained turns out to be a directed multipartite graph. Based on the graph-theoretical formulation, an efficient solution algorithm is proposed for the problem. It is shown that the algorithm is polynomial bounded. Therefore, it is applicable to large practical problems.     

支持动态联盟的车间控制信息系统框架模型

随着世界市场的不断变化与市场竞争的加剧, 动态联盟将成为新的企业组织形态,动态联盟环境下企业间信息流的管理和控制问题越来越 受到人们的重视．车间控制器的设计和开发也必须适应动态联盟的需要．本文对敏捷制造信 息系统（AMIS）和车间的信息流程进行了分析和探讨,结合现有的网络技术、代理技术以及 分布工作流技术,提出了支持动态联盟的车间控制信息系统框架模型．     

面向动态联盟的企业信息系统研究

动态联盟是企业生产组织形式的发展方向,也是企业面临激烈竞争的应对之策。文章主要研究面向动态联盟的企业信息系统。首先分析了系统的复杂性,然后在系统抽象的基础上分析系统功能要求与性能要求,最后对实现技术进行了简介并给出一种实现参考模型。     

基于VESA的虚拟企业构建方案的研究

虚拟企业是二十一世纪制造企业的主要模式,它面向全球范围的企业资源,通过构建虚拟企业的联盟之间重组,实现了联盟企业间的柔性化。如何迅速构建虚拟企业是敏捷制造企业要解决的首要问题。Internet的飞速发展,为企业利用互联网实现虚拟企业的构建提供了基础。文章提出了采用ISP形式的虚拟企业构建方案——虚拟企业服务代理商（Virtual Enterprise Service Agent,VESA）,并探讨了VESA的应用构建框架和处理业务。     

敏捷制造下车间重构中的制造资源选择

敏捷制造被认为是21世纪的制造模式．实现敏 捷制造的组织形式是敏捷虚拟企业（AVE）,它根据产品开发的需要动态重构．动态重构敏 捷虚拟企业中的制造资源选择问题是对实现敏捷制造的挑战．本文给出了一个资源选择问题 的整数规划模型,其目标是使费用最小．利用任务之间的先后顺序的特点,我们将整数规划 模型转换为图论模型．基于图论模型,我们给出了一个求最优解的有效算法．其计算复杂性 是多项式有界的．     

基于CORBA支持动态联盟的多Agent工作流管理系统

讨论了基于多Agent的工作流管理系统，可以较好地解决多工作流之间的组织、调度及通信问题，为动态联盟环境下的工作流管理提供技术支持。最后给出了基于CORBA规范和KQML协议的工作流管理系统的实现策略。     

Design of agile supply chain assessment model and its case study in an Indian automotive components manufacturing organization

Agile Manufacturing (AM) paradigm is fast instilled in modern organizations. AM enables an organization to evolve products and services quickly and economically in response to the customers’ dynamic demands. The effectiveness of AM is largely determined by the performance of Agile Supply Chains (ASC). In order to assess their performance, an ASC assessment model was reported in this research paper. This model is encompassed with agile supply chain attributes whose performance levels need to be determined for assessing the overall ASC performance of the organization. The computation was performed using fuzzy logic approach. The working of this model was examined by conducting a case study in an Indian automotive components manufacturing organization. The experience gained by conducting this case study favored the use of a computerized system which will ensure accuracy of computations involving fuzzy logic.