从com到service

当整个世界都在为互联网喝彩的时候,人们心中往往都会进行这样的思考——我怎样才能在互联网上获得财富?如何实现商业模式转变,迎合服务为导向的业界潮流?惠普公司认为答案就是E-service。我们采访了惠普的合作伙伴,请他们谈谈对这个问题的看法。     

Relationship between consumer’s preference and service attributes in mobile telecommunication service

The mobile telecommunication sector is increasing, thus becoming a key area for economic development in global and local markets. One of potential ways to promote competition among service providers is to introduce a mobile number portability (MNP) service. Consumer preferences are estimated using conjoint analysis. Results indicate that subscribers do not consider the MNP service an import attribute, while price and service quality are the most valuable attributes. The results of this study provide important information to implement the first service launch in mobile telecommunication and other similar information and communication technology (ICT) services.     

The transport service adaptor — A high performance transport service network interface device

The transport service adaptor is an attempt to implement the functions required for a standard transport service interface into an intelligent high performance network interface device and therefore to reduce the host device software requirement. In this paper the details of the hardware and software that comprise the transport service adaptor and the physical and logical levels of the host device interface are described. Brief details are given of the local area network to which the transport service adaptor connects, together with the facilities that the network makes available.     

Web service集成标记语言关键技术研究

描述Web service的标记语言在使服务能被人们或软件Agents动态发现方面发挥着重要的作用。学术界和工业界研究小组在服务描述、发现、集成、执行上推出了很多基于XML结构的语言。这些语言中有些已经定义了良好的语义,有些是基于工作流方式的,同时也有一小部分是综合利用其它几个独立的语言而形成。面对这么多都被推荐成为标准的语言,对它们的优点和缺点作深入的分析是十分必要的。本文首先从便于服务描述、发现、集成和执行的角度,分析了Web service集成标记语言所应具有的特性,如表达性、语义支持、可用的支持工具、核心集成机制、对容错及异常处理的支持;然后简要描述了比较熟悉的几种服务集成语言的相关技术;最后对这些语言的关键特性作了比较。     

Web service＋delphi开发办公小助手

本文为在32位Windows平台上使用java、axis项目和delphi开发开发办公小助手的示例、步骤。本文中的示例使用wtp和delphi7．0调试。     

Dynamic web service composition based on OWL-S

Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe our approach to the extension of the OWL-S ontology framework for dynamic web service composition. We raise the level of abstraction and propose an abstract service layer so that web services can be com- posed at the abstract service level instead of the concrete level. Each abstract service is attached with an instance pool including all instances of the abstract service to facilitate fail-over and dynamic compositions.     

基于Web service的DSS模型库系统研究

管理和使用模型是DSS模型研究的一个非常重要的课题。文中将Web service技术引入到DSS模型库系统中，提出基于Web service的模型库系统，给出基于Web service的DSS模型存储、模型查询、维护以及模型调用策略，并介绍了基于Web service技术的模型库系统体系结构。     

基于Web service的电子政务数据集成研究

随着政府信息化进程的深化,信息量亦将与日俱增,而各级机关政府部门开发出的电子政务系统在数据交换和系统集成上存在很大的困难。该文基于Web service对电子政务系统中涉及到的一些关键环节进行了探讨了实现。     

基于Web service的分布式计算机资源共享平台

在当前超级计算机紧缺导致需要大规模计算的大型项目得不到足够的计算资源支持的背景下,本文提出设计基于网络和Web Service的分布式计算资源共享平台,利用大量闲置的个人计算资源,提供大规模计算服务,提高科学计算的工作效率.     

基于Web service的DSS模型库系统研究

管理和使用模型是DSS模型研究的一个非常重要的课题。文中将Web service技术引入到DSS模型库系统中,提出基于Web service的模型库系统,给出基于Web service的DSS模型存储、模型查询、维护以及模型调用策略,并介绍了基于Web service技术的模型库系统体系结构。     

A strategy for service realization in service-oriented design

Recently service orientation is becoming a mainstream approach for building large scale software systems. A key requirement in service-oriented design is the de- pendability of service. It stipulates that the behavior of services is controllable. Formal models can aid in constructing software in a dependable manner. They can describe ser- vices precisely and compose them together consistently. This paper presents a strategy for service realization based on a novel layered formal model. When a service is provided or required via internet, the semantic consistency becomes critical issue. Our architecture tackles the issue by proposing a novel scheme: defining contract of a service to keep semantic information. Although service-oriented design is our prime target, the contract models, to a large extent, are independent of the framework of design and therefore ap- plicable to large scale software design in general.     

P2P与Web service的融合

Peer-to-Peer技术(P2P),是一个新出现的有可能改变下一代Internet架构的研究热点。Web Service是近年来蓬勃兴起的一种分布式计算模型,它能够实现在不同平台上、不同程序语言编写的应用程序或者应用程序组件之间无缝的互操作。为了实现P2P和Web Service融合,该文首先分析了P2P技术以及JXTA有关协议、Web Service中XML,WSDL,UDDI,SOAP等相关技术,通过在P2P网络中设置代理,使得P2P网络中的对等体能够访问和调用Web Service。     

基于语义的Web service组合技术研究

随着Web服务的发展,Web服务组合越来越显示出其必要性。文章分析了语义Web服务组合的特点,着重阐述了基于AI规划的语义Web服务组合方案。     

基于web service的分布式协同cad系统框架

Autocad设计软件作为目前设计行业的主要软件之一,以其强大的设计功能以及简便的操作方式被广泛应用于各个行业领域的设计工作之中。但是随着设计工作呈现出复杂化、涉及专业面越来越广的发展趋势,cad设计软件的分布协同功能也日益受到人们的关注,尤其是在互联网技术发达的今天,如何有效将cad设计系统实现协同设计功能并具备web service特点,成了设计行业所需要研究的课题。     

Research and development of message service based on JMS

Message service has got more and more extensive applications among the applied procedures used in business enterprise, and the message service developed with the CORBA and RMI, etc. costs a great deal of time and energy to carry on the maintenance of the code. According to the effective demand of the message service, This paper studies on the technique of JMS, puts forward a new kind of message service model based on JMS, and discusses the implementation of online recruitment system based on this model. At the same time, it also puts forward a homologous mechanism which is used to deal with the dead message problem that usually appears in this system.     

Web service adaptation: A decade’s overview

With the exponential growth of communication and information technologies, adaptation has gained a significant attention as it becomes a key feature of service-based systems, allowing them to operate and evolve in highly dynamic and uncertain environments. Although several Web service standards and frameworks have been proposed and extended, existing solutions do not provide a suitable architecture, in which all aspects of monitoring and adaptation (e.g., proactive, cross-layer, and autonomic adaptation) can be expressed. In addition, the emergence of new computing environments to host and execute various types of services (Web/cloud services, big data-intensive services, mobile services, microservices, etc.) raises the need for more efficient monitoring and adaptation systems. This survey aims to bring a synthesis and a road-map to the adaptation of service-based systems. We also discuss adaptation solutions in emerging service models, such as cloud services and big services. Based on an adaptation taxonomy which we extracted from the surveyed approaches, and by identifying the main requirements and goals of service adaptation in Web, cloud and big data environments, detailed analysis and discussions, as well as the open issues, are provided.     

Performance evaluation of cloud service considering fault recovery

Cloud computing is a recent trend in IT, which has attracted lots of attention. In cloud computing, service reliability and service performance are two important issues. To improve cloud service reliability, fault tolerance techniques such as fault recovery may be used, which in turn has impact on cloud service performance. Such impact deserves detailed research. Although there exist some researches on cloud/grid service reliability and performance, very few of them addressed the issues of fault recovery and its impact on service performance. In this paper, we conduct detailed research on performance evaluation of cloud service considering fault recovery. We consider recovery on both processing nodes and communication links. The commonly adopted assumption of Poisson arrivals of users’ service requests is relaxed, and the interarrival times of service requests can take arbitrary probability distribution. The precedence constraints of subtasks are also considered. The probability distribution of service response time is derived, and a numerical example is presented. The proposed cloud performance evaluation models and methods could yield results which are realistic, and thus are of practical value for related decision-makings in cloud computing.     

Web service的事务协调框架研究与实现

提出并实现了一种Web服务的事务协调框架,DTCF（Distributed Transaction Coordination Framework）。该模型基于嵌套事务模型和协调思想,将局部事务的实现细节进行封装,不同局部事务可采用不同的并发控制和恢复技术,而对全局事务则采用完全分布的管理机制进行管理。DTCF是一种可重用的框架,实验结果表明其可用性。