Resource Space Grid: model,method and platform

A Resource Space Grid is a virtual Grid that aims at effectively sharing, using and managing versatile resources across the Internet. The kernel of the Resource Space Grid includes a Resource Space Model (RSM) and a uniform Resource Using Mechanism (RUM). This paper presents the Resource Space Grid's core scientific issues and methodology, architecture, model and theory, design criteria and method, and practice. A normal form theory is proposed to normalize the resource space—a coordinate system for uniformly specifying and organizing resources. The RUM provides not only the end‐users with an operable resource browser to operate resources using the built‐in Resource Operation Language (ROL), but also the application developers with the ROL‐based programming environment. The prototype platform based on the proposed model and method has been implemented and used for sharing and managing resources in distributed research teams. Operations on Resource Spaces can constitute the virtual communities of Resource Space Grids—a platform independent resource sharing environment. Copyright © 2004 John Wiley & Sons, Ltd.     

抗量子可信计算安全支撑平台技术

随着科技的发展,量子计算机大规模部署逐渐变为可能,基于部分计算困难问题的公钥密码算法将被量子算法有效求解.传统的可信硬件芯片如TCM/TPM等由于广泛使用了RSA、SM3、ECC等公钥密码体制,其安全性将受到严重影响;而绝大部分具有抗量子能力的密码算法并不适配现有TCM/TPM芯片有限的计算能力,因此需要对抗量子可信计...     

An agent-based service-oriented integration architecture for collaborative intelligent manufacturing

The rapidly changing needs and opportunities of today's global market require unprecedented levels of interoperability to integrate diverse information systems to share knowledge and collaborate among organizations. The combination of Web services and software agents provides a promising computing paradigm for efficient service selection and integration of inter-organizational business processes. This paper proposes an agent-based service-oriented integration architecture to leverage manufacturing scheduling services on a network of virtual enterprises. A unique property of this approach is that the scheduling process of an order is orchestrated on the Internet through the negotiation among agent-based Web services. A software prototype system has been implemented for inter-enterprise manufacturing resource sharing. It demonstrates how the proposed service-oriented integration architecture can be used to establish a collaborative environment that provides dynamic resource scheduling services.     

Application mobility in pervasive computing: A survey

Pervasive computing applications often need to maintain uninterrupted computing experiences when users move across devices. This advanced feature, recognized as application mobility, brings many challenges to the pervasive computing community. For a better understanding of the challenges and existing approaches to application mobility, this paper surveys related work with a classification and comparison framework established along four dimensions of design concerns in application migration: temporal, spatial, entity and other concerns. Through this survey this paper attempts to provide a systematic reference for developers to leverage off among different migration strategies for seamless application mobility. Moreover, it sheds some light on future work directions.     

智能合约Gas优化综述

区块链2.0最显著的特征是增加了对智能合约的支持,这使得区块链拥有了运行各种应用程序的能力. 智能合约是一种根据预先定义的代码逻辑自动运行的计算机软件. 区别于传统软件,区块链技术赋予了智能合约不依赖可信中心机构而在相互不信任的节点上正确执行的能力,使其在数字支付、共享经济等领域被广泛地应用. 为了防止滥用智能合约导致计算资源被浪费,以太坊等区块链向部署和执行智能合约这2种活动收取Gas（燃料）费用. 智能合约消耗的计算资源是决定费用高低的因素. 具有低效代码的智能合约浪费资源且易受攻击,此类智能合约的开发者和用户将承担不必要的费用. 因此,优化智能合约以节省资源已经成为开发者和研究者重点关注的问题. 首先详细分析了智能合约Gas优化所面临的主要挑战;然后回顾和总结了近年来提出的各种优化技术;最后展望了该研究方向的未来工作,旨在为智能合约的开发者和研究人员提供参考和借鉴.

     

基于SNS的Web协作学习系统设计

随着Web2.0的快速发展,具有社会特征的SNS软件不断涌现,基于SNS平台的Web协作学习逐渐成为一种新型学习模式。提出了一种基于SNS的Web协作学习模式,并结合国内主流的SNS平台进行二次开发,设计了一个面向SNS的Web协作学习系统,主要实现了个人社区、协作学习社区、文件共享和问答系统等模块。实践证明该系统能够实现高效的Web协作和资源共享,能够帮助学习者更好地交流学习心得和分享学习成果,从而增强学习者的学习兴趣和解决问题的能力。     

Idioculture in crowd computing: A focus on group interaction in an event-driven social media system

This study aims to establish a conceptual framework on the characteristics of idioculture in crowd computing, as well as the antecedents and consequences of idioculture. Idioculture is defined as distinct cultural elements that characterize a certain group. It is important in group interaction because it can be used as a tool to seek a group's optimal distinctiveness, which is a natural human desire to maintain a balance between being too inclusive or too personalized in crowd settings. In order to provide empirical data for the conceptual framework, this study developed a crowd computing system prototype, named event-driven social media (EDSM), which supports idioculture emergence and sharing in a crowd setting. The prototype was implemented in a massive-scale event involving approximately 20,000 people. The study results were derived from content analysis on 5988 text messages from 1510 users exchanged through EDSM during the event and interviews with 15 users after the event. The findings revealed that group cultures were triggered by EDSM to become idioculture, and the idioculture shared through EDSM affected user experience. First, sources of idioculture included collective, playful, and routine-breaking group cultures. Second, the characteristics of idioculture included catchwords, humorous references, and nicknames. Third, by sharing idioculture, users of EDSM were able to experience social connectedness, group cohesion, and social enjoyment. This study ends with implications on the design of EDSM from the perspective of HCI.     

基于语义与句法的Java类库检索方法与系统

提出了一个支持系统化、大规模软件复用的基于语义与句法的可复用模块的检索方法,并介绍了基于此方法支持Jwa类库的实用检索系统。软件开发者既可以使用自然语言直接描述待开发软件的功能语义并用此查询类库中的相关模块,也可以通过对输入输出数据类型的描述对Java类库进行快速地查询,还可以同时使用两者的组合来提高可复用库模块查询的精度。     

Increasing application accessibility through Java

Java has begun to open up new possibilities for accessing applications on the Web. With Java, developers can write applications as applets and insert them into Web pages. The user can then retrieve and execute them with local computing resources. We show how developers can use this feature to create a network computing platform that lets Web users share applications not specifically devised for network use, including those that are computationally intensive. With our approach, the network is not involved as long as the user executes operations on the graphical interface, which is executed locally on the client. Only when users require some computational response from the server do they need to access it. Access is straightforward; authorized users can access the application from any node connected with the Internet as long as they have a Java-enabled Web browser. We have used used one such network computing platform to port an existing tool and develop a new application     

Using views for product data exchange

Proprietary data structures complicate data sharing by making it difficult to save a product model from one software tool and load it directly into another tool. Engineers may want, for example, to verify with an analysis tool that all design constraints have been met or to prepare a design for manufacturing. In such cases, software developers must find a means of moving the product model from the proprietary data structures of a CAD system to those of the analysis system and the manufacturing system, with minimal loss of information. A database view, used in conjunction with data exchange standards, can facilitate the sharing of product model data between software tools in design and manufacturing computing environments     

Data Grid discovery and Semantic Web technologies for the earth sciences

This paper describes scientific data discovery for the earth sciences in the context of data Grids and Grid computing. Requirements and use cases illustrate current challenges due to size, distribution, and minimal annotation of data. Semantics and the characterization of provenance in large data archives are discussed. The targeted community of users is also discussed. Solutions implemented by the Earth System Grid and the National Environment Research Council Data Grid include a prototype ontology, metadata schemas, search mechanisms, and discovery architectures. The use of Semantic Web technologies has facilitated the development of meaningful annotations of data content and opened the door to data discovery in federated systems.     

AnyQuery:网格环境下基于服务的分布式查询处理系统

AnyQuery是一种适用于网格环境、基于服务的分布式查询处理系统，使用统一的数据格式（可扩展标记语言）来表示和传输数据，所有组成模块以网格服务的形式实现，网格服务之间通过标准的接口进行通信．这种接口和实现分离技术屏蔽了不同数据库及其运行节点的差异，为用户提供一致的虚拟关系数据视图和分布式数据查询支持．在分析和研究已有的并行数据库和分布式数据库查询技术的基础上，AnyQuery提出和实现了一种适用于动态网格环境的分布式查询计划生成和执行算法，该算法能够根据网格环境中各节点及其连接网络的实际情况确定查询计划，支持跨数据库的连接查询．基于Globus 3．0开发了AnyQuery的原型系统，性能测试表明该系统具有较好的可扩展性，尤其适合计算密集型的复杂查询．     

基于 REST 风格的科学计算环境 Web服务 API

基于 Web 页面的计算门户提供了简单易用的用户使用界面,这些门户需要访问异构的计算机群。本文研究和实现基于 REST 风格的科学计算环境 Web 服务 API (SCEAPI-REST),其核心思想是充分利用 Web 服务在复杂系统中的集成优势以及 REST 风格的 API 跨平台和跨编程语言的特性,为开发者提供简单易用的计算机群开发接口,包括用户管理、资源查询、作业管理和文件传输等功能。基于 SCEAPI-REST,开发人员不再需要解决机群访问的繁杂问题,只需要专心构建面向科学计算的终端软件。该 API 已经应用到计算化学、材料科学、生物信息等多个领域的专业社区和工具软件。     

大型网络服务系统性能评测

网络用户数量的激增使得单机网络服务器已经不能满足用户需求,而通常的多机结构又具有维护代价高,负载不均衡等缺陷,使用Cluster绘声结构加上可扩展软件构成的单一入口点机群系统却可以很好地解决这一问题。介绍了曙光2000－Ⅱ型大规模并行计算机上采用该结构构造而成的多节点Web服务器和Email服务器,并对它们的性能进行了评测。多节点Web服务器使用SPEC公司开发的SpecWeb99评测,而Email性能则用国家智能机研究开发中心构造的Email评测软件,并通过对评测结构的分析,证明了该结构的优秀可扩展性能。     

基于WebGIS的油田地面工程信息发布的设计与实现

基于WebCIS技术建立的“大庆油田地面信息系统”,可以实现对大庆油田地面工程的科学规划。利用CeoMedia Web Map系列软件,以Web技术为核心,实现了大庆油田地面工程七个专业信息的网上发布。该系统包括原油集输系统等7个专业子系统：具有信息查询、辅助规划等4项功能。本文介绍了该系统设计的功能模块,给出了其软硬件环境与功能设计,并且介绍了信息发布采用的技术方法,用实例图示说明了实现的网络发布功能。     

一种面向服务的权限管理模型

面向服务的体系结构(Service-Oriented Architecture,SOA)是设计和构建松耦合软件系统的方法,它可将基于中间件开发的分布式应用共享为Internet环境下的软件服务．传统中间件的用户权限系统具有较好的灵活性,基本满足封闭系统的安全需求．但在SOA模式下,难以满足不同节点和系统互相请求服务和共享资源过程中的授权．该文提出了一个面向服务的权限管理模型,通过支持用户之间的代理和提供一定的推理能力,为应用开发者提供了更完善的权限管理机制,并扩展了中间件跨越组织共享资源和服务的能力．该模型在一个J2EE应用服务器上被实现和验证．实验证明,该模型具有良好的灵活性和可扩展性,并且性能影响在合理的范围．     

基于语义Web的动态组合服务关键技术研究

随着Webservice应用的发展,大量存在的应用服务之间需要解决共享和交互。Web服务的动态组合为解决信息共享和应用协作的瓶颈问题带来了新的方案。论文通过分析原有Web服务组合的特点,提出一个基于语义的Web服务动态组合框架,并在此基础上实现了一个动态服务组合系统原型。该原型支持组合服务的即时生成,以及在动态环境中快速部署和发布。     

Developing a web-based system for supervised classification of remote sensing images

Web-based image classification systems aim to provide users with an easy access to image classification function. The existing work mainly focuses on web-based unsupervised classification systems. This paper proposes a web-based supervised classification system framework which includes three modules: client, servlet and service. It comprehensively describes how to combine the procedures of supervised classification into the development of a web system. A series of methods are presented to realize the modules respectively. A prototype system of the framework is also implemented and a number of remote sensing (RS) images are tested on it. Experiment results show that the prototype is capable of accomplishing supervised classification of RS images on the Web. If appropriate algorithms and parameter values are used, the results of the web-based solution could be as accurate as the results of traditional desktop-based systems. This paper lays the foundation on both theoretical and practical aspects for the future development of operational web-based supervised classification systems.