基于RM—ODP模型的G—WebService的设计

Web Service,as a new standard framework for distributed computing,is to solve the existing problem of cross-platform communication and collaboration between distributed applications. Evolving from the Web Service ar-chitecture ,G-WebService framework, which is the definite substitute of WebGIS, will change the existing spatial infor-mation applications into geo-services. This paper first introduces the Web Service concept and the related standards,and then discusses the G-WebService architecture and implementation from five viewpoints,which is based on RM-ODP.     

Web-Based Semantic Similarity: An Evaluation in the Biomedical Domain

Computation of semantic similarity between concepts is a very common problem in many language related tasks and knowledge domains. In the biomedical field, several approaches have been developed to deal with this issue by exploiting the structured knowledge available in domain ontologies (such as SNOMED-CT or MeSH) and specific, closed and reliable corpora (such as clinical data). However, in recent years, the enormous growth of the Web has motivated researchers to start using it as the corpus to assist semantic analysis of language. This paper proposes and evaluates the use of the Web as background corpus for measuring the similarity of biomedical concepts. Several ontology-based similarity measures have been studied and tested, using a benchmark composed by biomedical terms, comparing the results obtained when applying them to the Web against approaches in which specific clinical data were used. Results show that the similarity values obtained from the Web for ontology-based measures are at least and even more reliable than those obtained from specific clinical data, showing the suitability of the Web as information corpus for the biomedical domain.     

Automatic generating test cases for testing Web applications

In order to ensure the security and reliability of Web application, the testing of Web application is one of the most effective methods. This work regards a Web application as the composition of different interactive Logical Components （LCs）. We combine LCs with agent to assist to automatic generate test cases for testing Web applications. From Pages-Flow-Diagram （PFD） of Web application under test, this research successively partitions Web applications into LCs, at different levels of abstraction, each of which is composed of Web pages and other LCs. We use an automaton to model each LC, and use compositions of automata to model interaction of LCs. Our approach supports concurrent access and interaction between LCs. It avoids the state space explosion problem effectively. It also enhances the reuse of component interactions and overcomes differences in actions between LCs by using an agent as a coordinator.     

StarBus+: Distributed Object Middleware Practice for Internet Computing

In the past decade, the booming of Internet challenges the middleware in three aspects: quality of service, balance of changes and stabilization, and across-Internet integration. This paper presents our work on distributed object computing middleware technology for these challenges, as well as the research and development on StarBus , which is a CORBA standard-compliant middleware suite with the features such as object request broker supporting multi-* quality of service, component model, and integration with Web Service. This paper comprehensively presents the design and characteristics of StarBus , and demonstrates how StarBus is enhanced to address the challenges of Internet computing through three case studies: inter-enterprise integration over Internet, application evolution through dynamic reconfiguration, and great massive information system building. The paper also suggests some research directions which are important for Internet computing.     

Web caching: A way to improve web QoS

As the Internet and World Wide Web grow at a fast pace, it is essential that the Web‘s performance should keep up with increased demand and expectations. Web Caching technology has.been widely accepted as one of the effective approaches to alleviating Web traffic and increase the Web Quality of Service (QoS). This paper provides an up-to-date survey of the rapidly expanding Web Caching literature. It discusses the state-of-the-art web caching schemes and techniques, with emphasis on the recent developments in Web Caching technology such as the differentiated Web services, heterogeneous caching network structures, and dynamic content caching.     

构建数字城市的元数据服务体系

Metadata is one of the six key technologies of Digital Earth,which is also an important aspect in buildingand implementing the Digital City. Based on the technologies and standards of Web Services ,the author came up witha metadata services architecture in the distributed heterogeneous network environment of Digital City. In this paper,the metadata services architecture is described and explained in detail,including the related standards,technologies,and the practical experiences in the ‘Metadata Sharing Network Project of Digital Beijing‘ as well. It also points out that, based on the Web service ,to build the metadata service architecture will be practically meaningful for organizing,managing and sharing the information resources in Digital City.     

The Future Is Here： m-Learning in Higher Education

The way we learn has changed dramatically in the new millennium. The introduction of e-learning in higher education in the late 1990s has opened Pandora＇s Box, and brought radical changes in the way where undergraduate and postgraduate programs are designed and delivered. The rapid developments and popularity ofhandheld devices such as smart phones and tablet PCs using wireless networks and mobile Intemet have marked new developments in higher education, introducing the so-called mobile leaming （m-learning）. This means that university students can have access to their studies related content, anytime, anywhere in a personalized manner; this is what renders m-learning so popular and fashionable among university students globally. Nevertheless, instructors are now challenged as they have to adopt new pedagogies in learning and teaching. This paper discusses the concept of m-learning, as well as the current developments and challenges related to the major stakeholders （educators and students） in higher education.     

Semantic Web Enabled the Context Information in Ubiquitous Computing System

In this paper, we develop an intelligent environment called the personified home service system, which we have implementeA using standard Semantic Web （RDF, OWL, DAML）, Web Services （SOAP, WSDL） and pervasive computing （UPnP） technologies. Extending the human-machine interaction, home devices such as sensor, TV and refrigerator could be used as interactive devices not only Mouse and CRT. It offers an incentive to device manufacturers to incorporate Semantic Web technologies into their devices in order to get the benefits of easiness and more flexibility to the users. For extensive intelligence in the system, the Semantic Web can assist the evolution of human knowledge as a whole. We analyze user＇s daily records and predict the user＇s interests, and find user＇s potential interest through feedbacks, The Semantic Webs will bring structure to the meaningful content of Web pages, and create an environment where software agents roaming from page to page can readily carry out sophisticated tasks for users.     

Web使用挖掘系统研制中的主要问题和应对策略

With the rapid development of WWW,Web Usage Mining,as well as Web Mining,has become a hot direction in academic and industrial circles.It is generally believed that there are three tasks,preprocessing,knowledge discovery and pattern analysis,in Web Usage Mining.Though Web Usage Mining is still ranged in the application of traditional data mining techniques,in view of changes in application environment and operated data concerned,some new difficulties have arisen accordingly.This paper takes efforts to address such challenges in the three phases and introduces some proposed solutions simultaneously.     

Cu segregation and its effects on the electrical properties of calcium copper titanate

By sintering CaCu3Ti4O12 ceramics at different temperatures and testing the samples’properties,the segregation behavior of Cu and its effects were carefully studied.As the temperature rises,CuO segregates to the grain boundaries and gradually volatilize.Complete decomposition and volatilization occur at 1150°C.The behavior of CuO is found to be closely related to the formation of the grain boundary barrier,as well as the acquirement and evolution of the electrical properties,which are revealed in the resear...     

服务管理综述

1 引言随着网络技术和通信技术的迅速发展,Web服务逐渐成熟,在应用广度和应用深度方面都有突破,Web服务也从简单的信息发布、信息共享逐渐演变成智能的多功能服务。基于Web的服务管理是在Web服务功能逐渐智能化的基础上提出的。网络上的服务越来越多,处于无序状态,用户对Web服务的要求越来越多样化,有效组织好现有网络的资源,提供用户满意服务,就成为Internet发展必须解决的问题。 Web服务应由内容主导型(Content-Central)转向服务主导型(Service-Central)。由基础服务转向智能服务。近年来围     

基于RSS的网络文摘管理系统的设计与实现

本文对搭建RSS网络文摘管理系统网站进行了简要的介绍。它主要实现用户管理、网摘管理、网摘分类管理、信息恢复、网摘加入RSS、修改密码等功能;并对数据库结构进行了较详细的分析。     

基于RSS的网络文摘管理系统的设计与实现

本文对搭建RSS网络文摘管理系统网站进行了简要的介绍。它主要实现用户管理、网摘管理、网摘分类管理、信息恢复、网摘加入RSS、修改密码等功能;并对数据库结构进行了较详细的分析。     

Performance Evaluation of a Hybrid Run-Time Management Policy for Data Intensive Web Sites

The issues of performance, response efficiency and data consistency are among the most important for data intensive Web sites. In order to deal with these issues we analyze and evaluate a hybrid run-time management policy that may be applied to data intensive Web sites. Our research relies on the performance evaluation of experimental client/server configurations. We propose a hybrid Web site run-time management policy that may apply to different Web site request patterns and data update frequencies. A run-time management policy is viewed as a Web page materialization policy that can adapt to different conditions at run-time. We define a concept that we have named the Compromise Factor (CF), to achieve the relationship between current server conditions and the materialization policy. The issue of Web and database data consistency is the driving force behind our approach. In some cases though, we prove that certain compromises to consistency can be beneficial to Web server performance and at the same time be unnoticeable to users. We first present a general a comparative cost model for the hybrid management policy and three other related and popular Web management policies. We then evaluate the performance of all the approaches. The results of our evaluation show that the concept of the CF may be beneficial to Web servers in terms of performance.     

Web服务网络管理研究与实现

把Web服务技术引入到网络管理中,通过封装功能提高网络管理系统的扩展性和灵活性。可以在网络异构环境下跨越防火墙和各种平台实现组件的互操作,把已有的网络管理功能包装起来,利用它组合组件进行计算的特性实现软件复用。从软件工程、设计模式的角度提出并分析设计Web服务网络管理新模型和SOAP与SNMP的转换接口,较好地解决了Web服务应用到网络管理中数据传输问题,可以把已有的网络管理功能包装起来,把分散的应用集成起来,为用户提供更为灵活的接口,实现软件复用,并跨平台实现了该系统。     

基于Web的小区物业管理信息系统设计及实现

本文分析了小区物业管理系统的功能和特点,提出了基于Web技术的小区物业管理信息系统的设计方案及其实现。     

Java技术的基于Web的网络管理应用

文章论述了网络管理的新趋势──基于Web的网络管理（Web－Based Management）的主要特点,实现WBM的主要方法及与WBM相关的实现技术,并探讨了用Java技术实现WBM的网络管理模式。     

产品数据管理系统的构造框架和实现方法

基于对产品数据管理的含义、主要功能和开放性的讨论，提出了产品数据管理系统层次化的构造框架和相应层应当遵从的主要标准.在这一模型基础上,提出并分析了实现产品数据管理系统的3种不同的方法：基于网络数据库管理系统的方法、基于群件平台的方法及基于Intranet和Web技术的方法.     

FC-RAID 3000的远程实时管理系统设计与实现

针对光纤磁盘阵列远程管理的需求,设计并实现了FC RAID3000的基于嵌入式Web服务器GoAhead的远程实时管理系统。该系统利用GoAhead实现与远程用户的通讯,获知用户请求后,对用户身份进行权限认证,解析用户请求,并以存储在小型文件系统中的RAID监控页面作为响应;用户发出监控命令后,远程管理控制模块负责解析用户命令并通过底层磁盘阵列控制模块执行相应的监控操作。利用该系统,连接在网络上的任一合法客户端都可通过Web浏览器实现对磁盘阵列的管理及实时监控,从而增强了磁盘阵列的管理性能。     

Web服务中一种基于时间衰减和反馈的信任管理机制研究

Web服务是在商业社会中兴起的一种新的Web应用。伴随着Web服务的发展,服务和服务请求者的数量变得越来越多,如何保障服务的利益和如何在海量的服务请求者中选择诚实的服务请求者将变得十分重要和困难,而现有的基于反馈的信任管理惩罚机制对于恶意的服务请求者缺乏有效的识别方法和惩罚机制。针对Web服务中缺乏对恶意服务请求者实施有效处罚机制的问题,本文在基于反馈的信任管理机制基础上,提出了一种反馈与时间衰减结合的信任管理机制,激励服务请求者提供诚实的访问行为,有效避免其对服务造成伤害,增强了Web服务的访问控制安全。