Preface

Net-centric computing refers to the broad discipline network environment. The current Internet, Web, and such network environments. Service orientation highligh and Service-Oriented Computing （SOC）, is becoming of conducting various computing tasks on a decentralized the emerging grids and sensor networks are examples of ted by terms such as Service-Oriented Architecture （SOA） an important methodology of net-centric computing.     

Modeling War as a Business Process with the Assistance of Service Oriented Architecture

The pace of war is increasing since militaries are adopting the ideas of NCW （network centric warfare）. Therefore, the process of war has to be modeled into the BP （business process） in order to benefit from available resources in real-time. There is an increasing need to automate command and control tools utilized in military operations because of the versatility and increase d tempo of operations. Operations can be commanded and orchestrated with the assistance of SOA （service oriented architecture）. SOA is currently seen as a technology that can satisfy these needs of NCO （network centric operations）. The BPs are chains of logic that request SOA services. This paper argues that in the case of a military setting, in order to achieve maximum impact with minimal effort （cf. downsizing）, military operations need to be modeled as BPs （e.g., a dismounted company attack）. This asks for using a RM （resource manager）, a scheduler and a BSS （battle secure scheduler） in allocating the requested services （e.g., processing a fire support order）. In the future, a single FFW （future force warrior）, an essential performer in military operations, can benefit from the BPs approach via enhanced performance, improved SA （situational awareness） and with decreased instances of fratricide. This introduced model examines war as a business process with the assistance of SOA and discusses how a business process--like orchestration of systems and services can improve the overall performance in given military settings.     

Performance Aware Service Pool in Dependable Service Oriented Architecture

As a popular approach to dependable service oriented architecture （SOA）, a service pool collects a set of services that provide the same functionality by different service providers for achieving desired reliability. However, if the tradeoff between reliability and other important qualities, e.g., performance, has to be considered, the construction and management of a service pool become much more complex. In this paper, an automated approach to this problem is presented. Based on the investigation of service pools in the typical triangle SOA model, two challenges critical to the effectiveness and efficiency of service pools are identified, including which services should be held by a pool and what order these services are invoked in. A set of algorithms are designed to address the two challenges and then a service pool can be automatically constructed and managed for given reliability and performance requirements in polynomial time. The approach is demonstrated on a J2EE based service platform and the comparison results between different pooling algorithms are evaluated.     

Research of Grid Middleware Based on P-S

Study the technology of grid middleware based on P-S, and illustrates the interrelated-technical question in details,such as term-matching, location-transparency and fault-tolerance., so get better availability, flexibility and extendibility of the application.     

An Effective Feedback Control Mechanism for DiffServ Architecture

As a scalable QoS(Quality of Service)architcture,DiffServ(Differentiated Service)mainly consists of two components:taffic conditioning at the edge of the DiffServ domain and simple packet forwarding inside the DiffServ domain.DiffServ has many advantages such as flexbility,scalability and simplicity.But when providing, AF (Assured Forwarding) services ,DiffServ has some problems such as unfairness among aggregated flows or among micro-flows belonging to an aggregated flow.In this paper,a feedback mechanism for AF aggregated flows is proposed to solve this problem.Simulation results show that this mechanism does improve the performance of DiffServ.Firt,it can improve the fairness among aggregated flows and make DiffServ more friendly toward TCP (Transmision Control Protocol)flows.Second,it can decrease the buffer requirements at the congested router and thus obtain lower delay and packet loss rate.Third,it also keeps almost the same link utility as in normal DiffServ,Einally,it is simple and easy to be implemented.     

服务主导架构在企业IT设计中的运用

服务主导架构(Service-oriented architecture,SOA)承诺可以带给信息系统更多的弹性,也能改善传统企业系统在系统整合以及系统流程定制化的不足,许多企业系统供货商,如思爱普公司,甲骨文,以及IBM等,都已经发布与SOA相关的软件包和工具。基于SOA对于系统开发与整合的潜在影响,其应用尚处于起始阶段,本研究从SOA的标准开始探讨,并比较分析不同供货商的SOA解决方案与导入方法。     

Adaptive Resource Allocation for Service-Based Systems

Due to its major advantages, service-oriented architecture (SOA) has been adopted in various distributed systems, such as web services, grid computing systems, utility computing systems and cloud computing systems. These systems are referred as service-based systems (SBS). In order to effectively use these systems in various applications, one major challenge which must be addressed is to manage the quality of services (QoS) to satisfy users’ requirements. In SBS, multiple services are often hosted by the same server and compete for the limited system resources of the server, such as CPU-time, memory and network bandwidth. In addition, service compositions, resource status of servers, workflow priorities and QoS requirements are usually dynamically changing in runtime. Hence, it is necessary to have effective techniques to allocate the system resources to each service provided by a server in order to satisfy the QoS requirements of multiple workflows in SBS. In this paper, a resource allocation approach is presented to adaptively allocating the system resources of servers to their services in runtime in order to satisfy one of the most important QoS requirements, the throughput, of multiple workflows in SBS.     

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.     

The study of the publish/subscribe system architecture basing on SOA

As one of the new development component model, SOA （service oriented architecture） has produced a profound influence to the future software design patterns. In this article we introduce the technical reference architecture, elaborate the key technology of SOA, analysis the problems of the publish/subscribe system basing on the traditional architecture, solve the tightly coupled relationship of the communication between the parties, overcome the poor adaptability of the changes in the operational deficiencies, and shield the complexity of the technical background.     

Trends in Computing with DNA

As an emerging new research area, DNA computation, or more generally biomolecular computation, extends into other fields such as nanotechnology and material design, and is developing into a new sub-discipline of science and engineering. This paper provides a brief survey of some concepts and developments in this area. In particular several approaches are described for biomolecular solutions of the satisfiability problem (using bit strands, DNA tiles and graph self-assembly). Theoretical models such as the primer splicing systems as well as the recent model of forbidding and enforcing are also described. of DNA nanostructures and nanomechanical devices as wellWe review some experimental results of self-assemblyas the design of an autonomous finite state machine.     

服务组件架构的框架元模型及实现扩展点研究

软件框架为特定领域内的软件重用带来了极大的便利,然而随着业务系统的发展,传统的基于组件的软件框架已经越来越难以满足业务系统发展的需要.面向服务架构作为新型的软件架构,具有极大的灵活性和扩展能力来支持业务系统的发展需要,在没有具体的指导规范下,SOA开发是相当困难的。服务组件架构作为目前SOA最佳的编程模型,对其深入研究和理解,将有助于快速开发基于SOA的应用。从SCA的基本概念出发,分析了SCA的组成结构,在此基础上给出了SCA框架元模型,分析研究了实现扩展类型,并给出了具体应用示例。     

一种面向服务体系结构的研究与设计

面向服务体系结构是新一代的架构思想,用于分布式软件开发,由于它具有良好地松散耦合、与平台无关等特性,很好地解决了系统的灵活性和互操作性.基于SOA的先进架构理念的面向服务体系结构框架模型主要包括Web服务运行时环境、服务管理容器和通用客户端的设计等.     

面向服务在企业信息系统中的应用

企业及政府部门信息系统中由于资源异构及需求快速变化而引起的问题越来越突出,促使企业采用面向服务的IT架构,或称为SOA(Service-Oriented Architecture)。面向服务的体系结构(SOA)已成为信息技术领域的研究热点,该文阐明了面向服务体系结构的概念及其应用。     

基于SOA的呼叫中心系统①

提出了一种基于SOA的呼叫中心系统。该系统在分析了面向服务架构SOA模型的基础上,采用企业服务总线ESB原理及Web Service技术搭建,实现了松耦合、模块化以满足更加灵活的业务需求,并应用于实际电信系统建设     

Component meets service: what does the mongrel look like?

Computing with services has attracted much attention as a promising approach for developing distributed applications. The approach is often advertised as being superior to distributed component-based software engineering (CBSE), because it provides a higher potential to bridge heterogeneous IT application and infrastructure landscapes. It facilitates cross-institutional cooperation, lets services run over all kinds of ubiquitous communication infrastructure, scales better and simplifies legacy software integration. If this were absolutely true, there would be no reason for a consortium of major vendors of service and Java EE technology to come up with a new specification, called service component architecture (SCA). This emerging standard tries to leverage service-oriented architecture (SOA) principles with component-based software development techniques. In this article we discuss some commonalities and fundamental differences of the CBS and SOA worlds. We illustrate SCA briefly using snippets of an ongoing case study based on an e-university federation. Then we elaborate on the qualities and current deficits of SCA in the light of CBSE findings and related works.     

服务总线支持Pub-Sub模式的路由研究

近年来，随着电信行业业务应用的发展，对电信业务服务质量提出了更高的要求。面向服务的体系结构（SOA）提供面向业务的系统框架。采用SOA架构的电信业务系统能满足处理性能、稳定性、完整性及其智能化程度等因素上的高要求。本文以电信行业业务服务性能为目的，从SOA架构的核心基础设施企业服务总线（ESB）对服务路由的支持着眼，提供服务跨系统的Pub／Sub交互，在基础设施上满足服务性能需求，并应用到电信行业中。     

面向服务架构的迁移方法研究

随着面向服务架构的不断成熟,越来越多的企业选择将原有的应用系统迁移到此架构下,以便更好地整合企事业IT资源。本文对企业应用向面向服务架构迁移的方法进行了研究,结合服务与业务流程的关系,提出了一种以服务为中心、自上而下与自下而上相结合的迁移方法,并结合实例介绍了迁移的关键步骤。     

面向服务的知识发现体系结构研究与实现

知识发现服务(Knowledge Discovery Service,KDS)作为一种数据、计算、语义密集型的高层服务应用。用户通常需要具备非常全面的知识才能正确使用．如何实现一个面向最终用户的、智能的、有质量保证的KDS架构面临很多困难．现有的研究提出了利用数据挖掘本体和预测执行时间的方法来帮助用户选择正确并且高质量的KDS．但是数据挖掘本体只是对数据挖掘的方法进行枚举,无法保证服务的质量,而预测执行时间的方法不能体现KDS本身的特点,因而难以获得满意的服务效果．为了更有效地辅助最终用户在面向服务的体系结构(Service Oriented Architecture,SOA)上自助地实现知识发现应用,该文提出了一种新的面向服务的知识发现体系结构——SOA4KD,将用户的知识发现需求分为内容需求和质量需求,并提出了扩展的知识发现任务本体EKDTO。以自然语言的方式进行用户意图获取;在考虑到KDS的服务特性的前提下,充分分析了KDS自身的特点,提出了KDS质量本体KDSQO,采用元学习来进行选择最适合的KDS．相对于目前的体系结构,提出了为最终用户提供高质量知识发现服务的一些新方法和技术,为面向服务的知识发现系统设计与实现提供了一个新的参考模型．     

面向SOA的企业服务总线研究与实现

针对企业日益增长的信息共享和业务整合的需求,面向SOA的企业服务总线屏蔽各类异构的应用从而实现基于SOA架构的企业应用集成是大势所趋。现有的面向SOA的企业服务总线（s-ESB）大多立足于提供Web服务容器,并没有提供统一的适配机制无缝集成各类企业应用,从而极大限制s-ESB的高可用性和可扩展性。首先,提出了一种新型的基于SOA架构的企业应用集成环境,从而明确了s-ESB在构建企业应用集成中的地位和作用;其次,提出了s-ESB的体系结构模型,并解决了协议适配,服务适配和公共服务等关键技术问题;最后,原型系统证明s-ESB的灵活性,可有效集成各类异构企业应用。