支持CSCW系统开发的通用流服务研究

归纳和总结了CSCW系统的基本功能及其关键支撑技术,提出了一个能支持CSCW系统开发的通用流服务的实现结构。该通用流服务建立在CORBA音／视频流规范基础之上,能够为音频、视频以及其它各种大流量数据提供可靠传输。基于该通用流服务,可以方便地建立各种灵活、可移植的分布式CSCW系统。     

面向服务监管的信息服务标识生成与管理方案

信息服务在对经济社会发展产生重大影响的同时,也带来了一系列安全挑战。实现对信息服务的细粒度、持续、动态监管,成为信息服务管理的重中之重。传统的静态身份认证和管理机制,难以满足对信息服务实体与服务质量的持续性监管需求。提出一种面向服务监管的信息服务标识生成与管理方案,从信息服务类别、服务等级、服务质量可信度等多个角度定义了一种信息服务标识格式,使用层次分析法对信息服务进行评级,并对信息服务标识进行动态管理,可满足面向多维业务属性的信息服务标识的签发和细粒度动态管理的需求。     

Datamatic baseoperations in factory management systems

A research program, oriented towards the development of a new generation software for engineering-economic factory management systems, is being carried out jointly by the Electric Power Engineering Department, Technical University of Denmark, and the Production Engineering Laboratory NTH-SINTEF, University of Trondheim. An outline of this program, emphasizing the more fundamental aspects, is the purpose of the present account. Essentially, the basic idea is that, independent of the size of the industrial firm, a flexible design of any such system must take place putting together standardized building-blocks. Hence, the aim is to develop, to formulate, and to test in industrial practice datamatic or data-processing base operations forming such blocks. The outcome of the program, therefore, paves the way for a new technique of system generation. A technique which, based on a high degree of software reuse, is especially suited to meet the demands of the future; that is, demands such as user-controlled system development, specific factory adjustment, fast system production, and cheaper, modular, extendable, and transparent solutions. A characteristics feature of a program like this, is that it combines knowledge from a variety of different fields comprising in particular system science, production engineering and data processing techniques. Accordingly, the program is subdivided into a series of mutually coordinated, doctoral projects carried through at the two institutions in close cooperation with interested Danish and Norwegian industrial firms. Each of these projects deals with selected parts of the comprehensive problem area which, in its entirety, the program attempts to cover.     

A contribution-based service differentiation scheme for peer-to-peer systems

Trust is required in a file sharing peer-to-peer system to achieve better cooperation among peers. In reputation-based peer-to-peer systems, reputation is used to build trust among peers. In these systems, highly reputable peers will usually be selected to upload requested files, decreasing significantly malicious uploads in the system. However, these peers need to be motivated by increasing the benefits that they receive from the system. In addition, it is necessary to motivate free riders to contribute to the system by sharing files. Malicious peers should be also motivated to contribute positively by uploading authentic files instead of malicious ones. Service differentiation is required to motivate peers to get involved by sharing and uploading the requested files. To provide the right incentives for peers to contribute to the system, the new concept of Contribution Behavior is introduced for partially decentralized peer-to-peer systems. In this paper, the Contribution Behavior of the peer is used as a guideline for service differentiation instead of peer’s reputation. Both Availability and Involvement of the peer are used to assess its Contribution Behavior. Performance evaluations confirm the ability of the proposed scheme to effectively identify both free riders and malicious peers and reduce the level of service provided to them. On the other hand, good peers receive better service. Simulation results also confirm that based on a Rational Behavior, peers are motivated to increase their contribution to receive services. Moreover, using our scheme, peers must continuously participate, reducing significantly the milking phenomenon.

An efficient data exchange scheme for semiconductor engineering chain management system

When IC production enters into the nano-meter generation, many yield problems are related to design. The semiconductor industry is eager to have engineering chain management systems (ECMSs) to tightly share engineering data among cooperative semiconductor companies, such as IC Design House, Mask-Fabrication Company, Foundry-Service Company, and Assembly/Test Company, via Internet for increasing the yield, reducing production cost, and decreasing time to market for a new IC. Traditionally, cooperative semiconductor companies exchange data through FTP that is activated manually. In recent years, the Web Services technology has provided a new and excellent approach for automatically exchanging and integrating data among heterogeneous systems on the Internet. In this paper, an ECMS framework for semiconductor industry is presented. Also, an efficient Web-Services-based data exchange scheme is developed to solve three core problems of data exchange in ECMS: the convenience of data exchange and integration, the security protection of data transmission, and the efficiency of transmitting data, in particular large binary data. Experimental test results show that the proposed EC data exchange scheme can fulfill the desired functional requirements and demonstrate a superior performance over the traditional data transfer methods. It is believed that the proposed data exchange scheme can be an effective solution to the data exchange problem of ECMS.     

A self-adaptation scheme for workflow management in multi-agent systems

Business processes, operational environment, variability of resources and user needs may change from time to time. An effective workflow management software system must be able to accommodate these changes. The ability to dynamically adapt to changes is a key success factor for workflow management systems. Holonic multi-agent systems (HMS) provide a flexible and reconfigurable architecture to accommodate changes based on dynamic organization and collaboration of autonomous agents. Although HMS provides a potential architecture to accommodate changes, the dynamic organization formed in HMS poses a challenge in the development of a new software development methodology to dynamically compose the services and adapt to changes as needed. This motivates us to study and propose a methodology to design self-adaptive software systems based on the HMS architecture. In this paper, we formulate a workflow adaptation problem (WAP) and propose an interaction mechanism based on contract net protocol (CNP) to find a solution to WAP to compose the services based on HMS. The interaction mechanism relies on a service publication and discovery scheme to find a set of task agents and a set of actor agents to compose the required services in HMS. We propose a viable self-adaptation scheme to reconfigure the agents and the composed services based on cooperation of agents in HMS to accommodate the changes in workflow and capabilities of actors. We propose architecture for our design methodology and present an application scenario to illustrate our idea.     

服务链中可认证的组密钥管理方案*

针对不依赖于专用的硬件设施、网络拓扑结构易变化的服务链进行了研究,提出一种适用于服务链的可认证组密钥管理方案。该方案基于双线性映射的密码体制并结合 门限的思想,采用身份认证的方法,提高了协议的效率和安全性。该方案在实现组密钥更新的同时也实现了服务链中虚拟网络功能间的连接安全,并对其正确性和安全性进行证明。分析结果表明该方案在保证服务链中各实例一定安全的同时,具有轮数少、通信和计算开销小的优点,适合用于服务链的动态密钥管理。     

Methodology for developing maintenance management systems using object orientation

Many organizations have begun to realize the importance of a computerized maintenance management system (CMMS) in an increasingly competitive manufacturing environment. This article proposes an object-oriented approach to the design and development of a CMMS that is intended to help the decision making of the maintenance manager. To overcome problems of conventional CMMS, the approach presents the transformation of the maintenance management system framework into an object-oriented maintenance management system (OMMS). The IDEF (Icam DEFinition) method is proposed to improve systems analysis and design of the CMMS in the object-oriented approach. © 1999 John Wiley & Sons, Inc.     

Analysis of a service center in a multiline factory

It has been demonstrated that several performance measures (e.g., expected delay and number in the system) improve when n servers take customers from a single queue rather than from n separate queues dedicated to individual servers. In this paper, we discuss the application of this concept in a manufacturing environment. In a multiple factory, common machines from individual lines were pooled to form a service center. The expected benefits, however, were not realized and we were called in to identify the cause of the poor performance. To analyze the service center, a Σ Gl/G/1 queueing model (the superposition of independent renewal arrival streams offered to a general single server) was used. We found that the material handling scheme in place significantly degraded the system performance. Using the model, alternative schemes were proposed to improve the performance of the facility.     

An optimized tailored nonlinear fluctuation smoothing rule for scheduling a semiconductor manufacturing factory

An optimized tailored nonlinear fluctuation smoothing rule is proposed in this study to improve the performance of scheduling jobs in a semiconductor manufacturing factory. The tailored nonlinear fluctuation smoothing rule is modified from the well-known fluctuation smoothing rules with some innovative treatments. At first, the fuzzy c-means and fuzzy back propagation network approach is applied to estimate the remaining cycle time of every job. Then the nonlinear fluctuation smoothing rules are constructed and tailored to the semiconductor manufacturing factory to be scheduled. Finally, the back propagation network optimization approach is proposed to optimize the rule. To evaluate the effectiveness of the proposed methodology, production simulation is also applied in this study to generate some test data. According to experimental results, the proposed methodology outperformed nine existing approaches in reducing the cycle time averages and standard deviations.     

Estimating the simulation workload for factory simulation as a cloud service

An essential and practical application of cloud manufacturing is factory simulation as a cloud service (FSaaCS). In this paper, several topics related to implementing FSaaCS are discussed. Among them, load balancing is considered a critical topic. To address this topic, estimating a simulation workload is a crucial step. After factors critical to estimating a simulation workload were summarized, several methods were applied to estimate a simulation load, relevant to the required simulation time, from these factors. An experiment using real data was conducted to compare the performance of these methods. In addition, the paired \(t\) test was performed and the results indicated that the performance of the fuzzy collaborative method is superior to those of some existing methods.     

Application of FlexSim software for developing cyber learning factory for smart factory education and training

Multimedia Tools and Applications - Smart factory is a manufacturing facility equipped with modern information and communication technologies, and it is considered as an innovative manufacturing...     

Building blocks for adaptable factory systems

Markets are becoming increasingly dynamical and unpredictable. Trends such as the shortening of the product life cycle, individualization of customer requirements and globalization, which includes an adaptation to international markets and standards, can be observed. In result, demands for adaptable factory systems are increasingly addressed towards an industrial engineering. The department of Factory Planning and Factory Management of Chemnitz University of Technology has proven its competences on this subject by developing approaches like Component-based Planning, PLUG+PRODUCE, High Performance Ramp-up or Competence-Cell-based Production Networks. These competences are now used in the project “Building Blocks for Adaptable Factory Systems”. In this project, partial factory systems are basically researched and transferred to an industrial practice. The objective is to achieve an adaptability, which meets the particular requirements of the planning situation. This is tried to be met by the elaboration of change-drivers like universality, mobility, scalability, modularity and compatibility. Therefore, the drivers' working principles have to be understood and made accessible. Concepts, procedures and methods for the design of future adaptable factory systems have to be developed. The central component of the set of building blocks is a manufacturing complex connected to the logistics system of an Experimental and Digital Factory by custom-built interfaces. The adaptability of the system is supported among others by tools for the digital factory, innovative identification and positioning systems, concepts for the supply of material and the self-controlling of logistical objects, as well as man–machine-interfaces. The paper will give an overview about the approach of Building Blocks for Adaptable Factory Systems. The relevant terms are defined and the underlying concepts are presented. Concepts for central controlling as well as distributed controlling with an RFID are introduced. First building blocks will be introduced. Deployed tools and equipment are discussed. Approaches for an effective energy management are explained.     

Some advanced semiconductor production-inventory management systems and their performances

The critical Issues of memory chip manufacturing management are the fluctuation of manufacturing yield rates and demand quantity. To cope with, these problems generated by such uncertainty, this paper deals with two types of advanced production-inventory management system of memory chip fabrication, which consist of yield estimation, repairing operation of inferior goods and adjustment procedure of production quantities based on the production quantity planning procedure with in-process buffer. Quantitative characteristics of the proposed systems are investigated through simulation experiments and comparison analysis between current and proposed systems is performed to clarify their relevancy.     

A polymorphic service management scheme based on virtual object for ubiquitous computing environment

For the ubiquitous computing environment, an important assumption is that all the components in any specific environment are connected with each other. With this assumption, we introduce an effective scheme to provide a personalized service based on Virtual Personal World (VPW). Virtual Personal World (VPW) which is a model focused on service continuity with specially designed components. Previous ubiquitous frameworks have been concerned with the location where a user is provided any specific service. However those questions above are not the most important problems anymore in VPW. It concentrates on the point whether the services are successive or not, wherever a user goes to any place. Services are not regarded as a sum of functions which is embedded on any objects in any certain place. We conceptually define a resource management scheme based on a unified form of the object which participates in service provision, so called virtual object (VO). Thus the service can be described as the sum of functions of VOs. With our resource management scheme, users can utilize their required object as VO wherever it is located. And also, for better utilization of VPW service, we introduce a novel form of profiles and service provision scheme based on the polymorphism. Our simulation result shows that the Ratio of VPW pure service time is 0.15 % higher than conventional location based service. And also the possibility that users can meet adequate service he wants raised 29 % in our proposed VPW environment.     

Microcomputer-aided material management in a furniture factory

This paper reports on the computer-aided techniques adopted in material management of a small-size furniture factory. The material management and optimization program, developed on an IBM PC-XT, consists of several modules. An editing module allows a user to create new process sheets or edit an existing process sheet. A second module track of the stock sheet size available. When several orders have been received at any one time, the user keys in the quantity of each order into the main program which searches through the files, extracts the dimension of the materials and groups them according to type and thickness. A sorting module automatically nests the patterns on the stock sheets and generates the optimized sawing sequences for an NC circular saw. A remnant management module maintains records of remnants according to user-definable area or length for future usage. Towards the end of the main program run, a report will be generated giving the sawing co-ordinates, sequences, utilization ratio, total stock sheets used, etc. The layout will be displayed graphically for visual inspection and confirmation. The optimization program greatly assists the local furniture factory in arriving at the correct production parameters.     

Evolving fuzzy rules for due-date assignment problem in semiconductor manufacturing factory

This paper presents a fuzzy modeling method proposed by Wang and Mendel for generation of fuzzy rules using data generated from a simulated model that is built from a real factory located in Hsin-Chu science-based park of Taiwan, R.O.C. The fuzzy modeling method is further evolved by a genetic algorithm for due-date assignment problem in manufacturing. By using simulated data, the effectiveness of the proposed method is shown and compared with two other soft computing techniques: multi-layer perceptron neural networks and case-based reasoning. The comparative results indicate that the proposed method is consistently superior to the other two methods.     

F-LEACH: a fuzzy-based data aggregation scheme for healthcare IoT systems

The Journal of Supercomputing - Internet of Things (IoT) is an emerging paradigm that consists of numerous connected and interrelated devices with embedded sensors, exchanging data with each other...     

A node management scheme for stable P2P service in mobile ad-hoc networks

In a mobile ad-hoc network, multiple number of nodes can communicate with one another without the need for an infrastructure network. It is used in many different types of places, including military zones and disaster or hazardous areas. In a mobile ad-hoc network, each node acts both as a main agent of communication and a relay. Furthermore, each gives a weakness to the network or is subjected to vulnerabilities from malicious attacks due to their distinctive qualities, namely mobility and limited power. Accordingly, in order for stable P2P service, it is important to maintain the reliability and connectivity of the network at a high level. With existing schemes, it has often been the case that when defective nodes or malicious nodes are detected, it also causes damage to normal nodes. In scheme suggested in this paper, those nodes that have temporary defects but otherwise normal and can recovered are kept in the network but those that are defective or malicious are eliminated from the network, using trust values. The simulation was carried out to evaluate the performance of the proposed method. As a result, the message transmission rate even if the impact of a malicious node than the conventional method was demonstrated increased keeping the stable network topology.     

Multi-criteria analysis for a maintenance management problem in an engine factory: rational choice

The industrial organization needs to develop better methods for evaluating the performance of its projects. We are interested in the problems related to pieces with differing degrees of dirt. In this direction, we propose and evaluate a maintenance decision problem of maintenance in an engine factory that is specialized in the production, sale and maintenance of medium and slow speed four stroke engines. The main purpose of this paper is to study the problem by means of the analytic hierarchy process to obtain the weights of criteria, and the TOPSIS method as multicriteria decision making to obtain the ranking of alternatives, when the information was given in linguistic terms.