Research and application of the network manufacturing service model oriented Jacquard industry

With the development of the network manufacturing in the world, manufacturing service has gradually been the main business form of the network manufacturing, the integrated manufacturing services has been a research focus of the network manufacturing system. In this paper, the integrated models of manufacturing industry technical services have been analyzed, and the application of integrated services have been further discussed on the industry-oriented network manufacturing platform. In this platform, the rapid development computer networks and information technology are support tools. According to establishing a manufacturing environment of collaborative design between the customers and enterprises, the manufacturing resources and technical resources can be shared with each other and the service-based business process reengineered. Finally, the manufacturing cycle of Jacquard products is reduced and t he competitiveness of the industry is improved.     

Urban Traffic Information Service Application Grid

Traffic information processing is very complicated because of dynamic, cooperative and distributed features.This paper describes the prototype system version 2.0 of Urban Traffic Information Service Application Grid (UTISAG),which is based on the previous version. In this version, a new architecture and more enhanced services are introduced.The remarkable characteristic of the new system is providing dynamic information services for travelers by grid technology.Therefore, the key research includes integrating large multi-source traffic data, forecasting route status, simulating regional traffic flow parallelly, and implementing optimum dynamic travel scheme based on massive GPS data.     

Optimal Checkpoint Placement on Real-Time Tasks with Harmonic Periods

This paper presents an optimal checkpoint strategy for fault-tolerance in real-time systems where transient faults occur in Poisson distribution. In our environment, multiple real-time tasks with different deadlines and harmonic periods are scheduled in the system by rate-monotonic algorithm, and checkpoints are inserted at a constant interval in each task. When a fault is detected, the system carries out rollback to the latest checkpoint and re-executes tasks. The maximum number of re-executable checkpoints and an equation to check schedulability are derived, and the optimal number of checkpoints is selected to maximize the probability of completing all the tasks within their deadlines.     

A Graphics System Distributed across a Local Area Network

Design of a general purpose graphics system in a computer network environment requiresthat the architectural design of the graphics system be suited to such an environment and theadvantages of the network environment be taken for distributed graphics processing and thesharing of resources. An architectural model is designed to meet these requirements. The modelis characterised by the distribution on the machines in the network of graphics facilitiesprovided by several graphics subsystems with various capabilities but compatible functionality,and the distributed processing of graphics across the network. This design structure has beenshown to be viable by using it as the basis for the implementation of the graphics system for theMU6G network at University of Manchester. The design methodology and the structure of thegraphics system are described in the paper.     

Mapping Business Workflows onto Network Services Environment

In order to implement the common adaptability in accessing distributed resources, it is fatal for web applications to deploy business workflows onto network service environment, which is composed of Web Services and Grid Services. This paper introduces abstract resources and abstract services to express abstract workflows, and expresses executable workflows that can run in service environments by resources and service instances. Thus the deployment and execution of business workflows are transformed into two mappings： the mapping of business workflow onto abstract workflows and the mapping of abstract workflows onto executable workflows. The definition of relevant parameters used to implement automatically mapping is formulized as Application Template （AT）. The most important component of AT is the corresponding relationship between business functions and abstract workflow fragments. AT also defines the restrictions while each abstract services are utilized in certain application tasks, as well as the associated service metadata. The latter avoids superfluous metadata by service providers, and simplifies unnecessary details in matching service instances.     

Mobile agent-enabled framework for structuring and building distributed systems on the internet

Mobile agent has shown its promise as a powerful means to complement and enhance existing technology in various application areas. In particular, existing work has demonstrated that MA can simplify the development and improve the performance of certain classes of distributed applications, especially for those running on a wide-area, heterogeneous, and dynamic networking environment like the Internet. In our previous work, we extended the application of MA to the design of distributed control functions, which require the maintenance of logical relationship among and/or coordination of proc- essing entities in a distributed system. A novel framework is presented for structuring and building distributed systems, which use cooperating mobile agents as an aid to carry out coordination and cooperation tasks in distributed systems. The framework has been used for designing various distributed control functions such as load balancing and mutual ex- clusion in our previous work. In this paper, we use the framework to propose a novel ap- proach to detecting deadlocks in distributed system by using mobile agents, which dem- onstrates the advantage of being adaptive and flexible of mobile agents. We first describe the MAEDD (Mobile Agent Enabled Deadlock Detection) scheme, in which mobile agents are dispatched to collect and analyze deadlock information distributed across the network sites and, based on the analysis, to detect and resolve deadlocks. Then the design of an adaptive hybrid algorithm derived from the framework is presented. The algorithm can dynamically adapt itself to the changes in system state by using different deadlock detec- tion strategies. The performance of the proposed algorithm has been evaluated using simulations. The results show that the algorithm can outperform existing algorithms that use a fixed deadlock detection strategy.     

Distributed environment representation and object localization system in intelligent space

A kind of new environment representation and object localization scheme is proposed in the paper aiming to accomplish the task of object operation more efficiently in intelligent space.First,a distributed environment representation method is put forward to reduce storage burden and improve the system’s stability.The layered topological maps are separately stored in different landmarks attached to the key positions of intelligent space,so that the robot can search the landmarks on which the map information can be read from the QR code,and then the environment map can be built autonomously.Map building is an important prerequisite for object search.An object search scheme based on RFID and vision technology is proposed.The RFID tags are attached to the target objects and reference objects in the indoor environment. A fixed RFID system is built to monitor the rough position(room and local area)of target and a mobile RFID system is constructed to detect the targets which are not in the covering range of the fixed system.The existing area of target is determined by the time sequence of reference tags and target tags,and the accurate position is obtained by onboard vision system at a short distance.The experiments demonstrate that the distributed environment representation proposed in the paper can fully meet the requirements of object localization,and the positioning scheme has high search efficiency,high localization accuracy and precision,and a strong anti-interference ability in the complex indoor environment.     

An assignment method for IPUs in distributed systems

In a distributed system,one of the most important thing is to establish an assignment method for distributing tasks.It is assumed that a distributed system does not have a central administrator,all independent processing units in this system want to cooperate for the best results,but they cannot know the conditions of one another,So in order to undertake the tasks in admirable proportions,they have to adjust their undertaking tasks only by selt-learning.In this paper,the performance of this system is analyzed by Markov chains,and a robust method of self-learning for independent processing units in this kind of systems is presented.This method can lead the tasks of the system to be distributed very well among all the independent processing units,and can also be used to solve the general assignment problem.     

From concepts to consistent object specifications: Translation of a domain-oriented feature framework into practice

A steady increase in consumer demands,and severe constraints from both a somewhat damaged environment and newly installed government policies,require today‘s product design and development to be faster and more efficient than ever before,yet utilizing even fewer resources.New holistic approaches,such at total product life cycle modeling which embraces all aspercts of a product‘s life cycle,are current attempts to solve these problems,Within the field of product design and modeling,feature technology has proved to be one very promising solution component.Owing to the tremendous increase in information technology,to transfer from low level data processing towards knowledge modeling and information processing is about to bring a change in almost every computerized application.From this viewpoint,current problems of both feature frameworks and feature systems are analyzed in respect to static and dynamic consistency breakdowns.The analysis ranges from early stager of designing(feature)concepts to final system implementation and application.For the first tie,an integrated view is given on approaches,solutions and practical experience,with feature concepts and structures,providing both a feature framework and its implementation with sufficient system architecture and computational power to master a fair number of known consistency breakdowns,while providing for robust contexts for feature semantics and integrated models.Within today;s heavy use of information technology these are pre-requisites if the full potential of feature technology is to be successfully translated into practice.     

基于轻负载代理的协同分布式入侵检测系统

The LAFCDIDS(Lightweight Agent for Collaborative Distribution Intrusion Detection System)presented in this paper is a distributed intrusion detection system with the ability of collaborative detection in real time.The hierarchy architecture of agents and the ability of collaborative detection in real time are evident characteristics of the LAFCDIDS.Lightweight agent and agent sensitivity are LAFCDIDS‘‘s new concepts,which can reduce the overload of protected system,shorten the period of intrusion detection,and are suitable for monitoring the distributed collaborating attacks.     

Web computing framework

In this paper an approach to provide Web-based framework for distributed execution of collaborative applications is presented. The work is part of a wider on-going project whose aim is to make computing resources, both hardware and software, available to Web users. The core of the system is the Web computing skeleton constructed from prefabricated Web-enabled components with the ability to open and maintain Internet connections and provide collaboration over the World Wide Web. A number of examples illustrate how Web presentation can be enriched with collaborative software using the Web computing framework.     

Design and development of Distributed Virtual Geographic Environment system based on web services

This paper aims to design and develop a Distributed Virtual Geographic Environment (DVGE) system. A DVGE system is an Internet-based virtual 2D and 3D environment that provides users with a shared space and a collaborative platform for publishing multidimensional geo-data, and for simulating and analyzing complex geo-phenomena. Users logging into the system from different clients can share distributed geo-information resources, including geo-data and geo-models, and can complete collaborative tasks. Web service technology provides effective solutions for constructing DVGE systems because of its ability to support multi-platform, multi-architecture, and multi-program-language interoperability on the Internet, but also because of its ability to share programs, data, and software. This paper analyzes the characteristics, relevant technologies, and specifications of web services, such as grid services, Open Geo-data Interoperability Specifications (OpenGIS), and Geography Markup Languages (GML). The architecture and working mechanisms of the DVGE system based on web services are then elaborated. To demonstrate DVGE systems based on web services, we examine a case study of water pollution in Yangzhou City, Jiangsu Province, China, using a prototype DVGE system that is developed with Jbuilder9.0 and Java3D 1.0 packages, and the Weblogic platform 8.1.     

Understanding collaborative learning activities in an information ecology: A distributed cognition account

Collaborative learning encloses a diversity of activities, interactions, and practices. Thus, designing a learning environment, potentially enhanced with technology, to support collaborative learning, is not an easy task. Using an in-class exploration involving four multidisciplinary teams, this research seeks to understand collaborative design activities within “InfoSpace” – an information ecology. That is, a collocated space enriched with a multiple interlinked heterogeneous technologies. The aim of the study is to explore how an information ecology works as an integrated cognitive system, through the lenses of distributed cognition. Through the analysis we constructed a detailed account of the information flow, physical layout and artefact models. We claim that distributed cognition framework can provide a lens for understanding interactions among learners, tasks, and tools in collocated technology enhanced learning environments. Furthermore, the analysis provides valuable insights on how the design of the information ecology supports collaboration and coordination.     

A collaborative virtual geographic environment based on P2P and Grid technologies

Solving a geographic problem usually requires collaborative work among a group of people in different geographic locations. Collaborative virtual geographic environment (CVGE), an integrated technology, offers an intuitive, efficient, and interactive visualization environment through which geographically separated users can explore complicated spatial information and conduct collaborative work. In this paper, two new technologies, Peer-to-Peer (P2P) and Grid computing, are tightly coupled to develop a CVGE system. This paper evaluates the potential contributions of the P2P and Grid technology to CVGE systems. Using a Grid based system architecture efficiently integrates and shares geographically distributed resources as well as modeling procedures built on different platforms. To offer a shared and interactive virtual collaborative geographic environment for resolving geographic problems, we developed several P2P services including a terrain visualization collaboration service and a video collaboration service. Finally, a CVGE prototype system is implemented for collaboration on silt dam planning on the Loess plateau. The experimental results show that the scheme developed in this paper is efficient and feasible.     

An approach for supporting distributed user interface orchestration over the Web

Currently, a lot of the tasks engaged by users over the Web involve dealing with multiple Web sites. Moreover, whilst Web navigation was considered as a lonely activity in the past, a large proportion of users are nowadays engaged in collaborative activities over the Web. In this paper we argue that these two aspects of collaboration and tasks spanning over multiple Web sites call for a level of coordination that require Distributed User Interfaces (DUI). In this context, DUIs would play a major role by helping multiple users to coordinate their activities whilst working collaboratively to complete tasks at different Web sites. For that, we propose in this paper an approach to create distributed user interfaces featuring procedures that are aimed to orchestrate user tasks over multiple Web sites. Our approach supports flexible process modeling by allowing users to combine manual tasks and automated tasks from a repertoire of patterns of tasks performed over the Web. In our approach, whilst manual tasks can be regarded as simple instructions that tell users how to perform a task over a Web site, automated tasks correspond to tools built under the concept of Web augmentation (as it augments the repertoire of tasks users can perform over the Web) called Web augmenters. Both manual and automated tasks are usually supported by specific DOM elements available in different Web sites. Thus, by combining tasks and DOM elements distributed in diverse Web sites our approach supports the creation of procedures that allows seamless users interaction with diverse Web site. Moreover, such an approach is aimed at supporting the collaboration between users sharing procedures. The approach is duly illustrated by a case study describing a collaborative trip planning over the Web.     

Collaborative applications over peer-to-peer systems–challenges and solutions

Emerging collaborative Peer-to-Peer (P2P) systems require discovery and utilization of diverse, multi-attribute, distributed, and dynamic groups of resources to achieve greater tasks beyond conventional file and processor cycle sharing. Collaborations involving application specific resources and dynamic quality of service goals are stressing current P2P architectures. Salient features and desirable characteristics of collaborative P2P systems are highlighted. Resource advertising, selecting, matching, and binding, the critical phases in these systems, and their associated challenges are reviewed using examples from distributed collaborative adaptive sensing systems, cloud computing, and mobile social networks. State-of-the-art resource discovery/aggregation solutions are compared with respect to their architecture, lookup overhead, load balancing, etc., to determine their ability to meet the goals and challenges of each critical phase. Incentives, trust, privacy, and security issues are also discussed, as they will ultimately determine the success of a collaborative P2P system. Open issues and research opportunities that are essential to achieve the true potential of collaborative P2P systems are discussed.     

JPernLite: extensible transaction services for the WWW

Concurrency control is one of the key problems in design and implementation of collaborative systems such as hypertext/hypermedia systems, CAD/CAM systems, and software development environments. Most existing systems store data in specialized databases with built-in concurrency control policies, usually implemented via locking. It is desirable to construct such collaborative systems on top of the World Wide Web, but most Web servers do not support even conventional transactions, let alone distributed (multi-Website) transactions or flexible concurrency control mechanisms oriented toward team work-such as event notification, shared locks, and fine granularity locks. We present a transaction server that operates independently of Web servers or the collaborative systems, to fill the concurrency control gap. By default, the transaction server enforces the conventional atomic transaction model, where sets of operations are performed in an all-or-nothing fashion and isolated from concurrent users. The server can be tailored dynamically to apply more sophisticated concurrency control policies appropriate for collaboration. The transaction server also supports applications employing information resources other than Web servers, such as legacy databases, CORBA objects, and other hypermedia systems. Our implementation permits a wide range of system architecture styles     

基于Multi-Agents 分布式医学诊断系统研究

医学诊断系统是一个新兴的复杂的应用系统,人工智能技术,计算机协作支持技术及 高速通信网络体系结构的发展促进了计算机支持的诊断系统的发展．当前医学诊断系统的难 点在于如何利用网络这个资源分布平台来获取所需要的数据及在数据不完整状态进行推理求 解，而这些问题的解决在于能够有一种机制使得能在一个标准的应用系统结构中准确的表示 并获取信息及集成各种医学资源使之相互协作．本文描述了一种利用多智能体(Multi-agen ts system, MAS)体系结构和中间件(middleware)技术如公共请求代理结构(Common Object Request Broker Architecture, CORBA)进行设计的分布式医学诊断系统. 该系统能集成多 种医学资源和医学应用实体并且能实现参与诊断的医学实体之间的协作，以减少由于信息缺 乏而带来的诊断偏差. 另外本文还将一种实验室开发的模糊最小最大神经网络(Fuzzy Min- Max Neural Network, FMMNN)的模糊规则提取方法应用于该系统以证实该分布式诊断系统的 优越性.     

基于网格技术的分布仿真方法研究

建模与仿真技术和计算机技术、信息技术的发展密切相关.以信息共享和协作为主要特征的网格技术为仿真应用系统的开发与实现提供了新的思路.文章分析了网格技术和分布仿真技术的特点以及两者在思想理念上的一致性,重点研究如何借鉴网格技术思想,构建航空领域复杂分布仿真系统体系结构.体系结构主要由仿真开发环境、仿真运行环境和仿真资源库组成,这三部分可有机地集成起来,为武器装备系统的论证、设计提供一个切实可行的实现环境.通过研究,目的是提出开发此类系统时所应遵循的公共框架,并探讨了与之相关的关键技术.     

Distributed and Collaborative Visualization

Visualization is a powerful tool for analyzing data and presenting results in science, engineering and medicine. This paper reviews ways in which it can be used in distributed and/or collaborative environments. Distributed visualization addresses a number of resource allocation problems, including the location of processing close to data for the minimization of data traffic. The advent of the Grid Computing paradigm and the link to Web Services provides fresh challenges and opportunities for distributed visualization—including the close coupling of simulations and visualizations in a steering environment. Recent developments in collaboration have seen the growth of specialized facilities (such as Access Grid) which have supplemented traditional desktop video conferencing using the Internet and multicast communications. Collaboration allows multiple users—possibly at remote sites—to take part in the visualization process at levels which range from the viewing of images to the shared control of the visualization methods. In this review, we present a model framework for distributed and collaborative visualization and assess a selection of visualization systems and frameworks for their use in a distributed or collaborative environment. We also discuss some examples of enabling technology and review recent work from research projects in this field.