基于下一代Internet的服务管理研究

Internet is best effort network, on the whole, it doesn't provide any quality of service assurance for services. Especially,all kinds of stream media need more network performance and quality of service. Currently, because of existing many heterogeneous networks, such as telecommunication network, IP data network , mobile network and so on ,in order to break off this heterogeneous network isolated complexion ,research and developmentnext generation network must be carried out,only by this way,can these isolated heterogeneous network be merged into an all IP network. This network will provide enormous services for service users,how to manage these services effectively is a topic proposed by next generation internet. [1] gave research status for service management and advance,this paper researches service management requirement for next generation Internet and workflow etc,and based on these technique,a service management architecture model is proposed. It consists of service access layer, service deployment layer, service providing layer, service mapping layer, policy control layer and network element managing layer. These layers coordinate to implement service management.     

A measurement approach of trust relation in web service

With the advent and proliferation of web services, quality of service serves as a benchmark to differentiate and select the services. Because trust has been regarded as an essential security relationship within a distributed network environment, quality evaluation of services from the viewpoint of trust presents a significant trend in decision support for selecting service over Internet. Unfortunately, the current research in the context of web services does not accurately reflect the randomness and fuzziness of trust, the basic issue in related research about trust. In this paper, we designed two kinds of trust cloud based on cloud model theory to describe the randomness and fuzziness of trust factors. Furthermore, a formalized calculation was provided to obtain the trust degree. To our knowledge, this is the first investigation into trust of web Service considering the integration of randomness and fuzziness, and applying the cloud model to quantitative evaluation of trust in the field of web services.     

Ontology-based P2P infrastructure for Web GIS services

This paper introduces ontology metric algorithm of web GIS in P2P environment, and proposes an infrastructure of web GIS services （WGServices） based on ontology, which is the integration of agents and Web services. We also designed a prototype of the WGServices and did some experiments. The experiment results show that the algorithm can improve the recall rate of web GIS services find from websites.     

An Overview of Data Mining and Knowledge Discovery

With massive amounts of data stored in databases,mining information and knowledge in databases has become an important issue in recent research.Researchers in many different fields have shown great interest in date mining and knowledge discovery in databases.Several emerging applications in information providing services,such as data warehousing and on-line services over the Internet,also call for various data mining and knowledge discovery tchniques to understand used behavior better,to improve the service provided,and to increase the business opportunities.In response to such a demand,this article is to provide a comprehensive survey on the data mining and knowledge discorvery techniques developed recently,and introduce some real application systems as well.In conclusion,this article also lists some problems and challenges for further research.     

A conceptual model of service customization and its implementation

With the development of Internet and next generation networks in telecommunications, more and more new services are required to be introduced into networks. Introducing new services into traditional network is always associated with standardizing new protocols. The progress of protocol standardization usually takes several years, which cannot meet the increasing demands of the applications in Internet and next generation networks. Service customization in network systems may be one possible solution to cope with this problem. Based on the principle that network service is provided by interactions among protocol entities, this paper proposes a conceptual model of service customization (SECUM) by separating the service logic from protocol interactive logic within existing network architecture. The theory of Communicating Sequential Processes (CSP) is used to formalize the SECUM in order to locate exactly the service logic and to define precisely the SECUM. For validating the SECUM‘s usability in practical network systems, this paper also proposes an implementation model for SECUM: a component-based protocol implementation model (CPIM). CPIM discomposes protocol entity into application component, service component, message component and communication component. Service component associates application component with message component. Users or network managers can customize network services by configuring service component. The paper shows respectively the applications of SECUM and CPIM by proposing a customizable IP service model based on SECUM and describing an implementation of Session Initiation Protocol (SIP) based on CPIM. Compared with the existing service-customization techniques, SECUM is a service customization model internal to network system and may provide more powerful capabilities of service customization.     

Software-Defined Cluster

The cluster architecture has played an important role in high-end computing for the past 20 years. With the advent of Internet services, big data, and cloud computing, traditional clusters face three c...     

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.     

Multi-mode interaction middleware for software services

Due to the independency, variability, and tailorability of software service in the open environment, the research of middleware which supports software services multi-mode interaction is thus of great importance. In this paper, an agent-based multi-mode interaction middleware model and its supporting system for software services were proposed. This model includes an interaction feature decomposition and configuration model to enable interaction programming, an agent-based middleware model, and a programmable coordination media based on reflection technology. The decomposition and configuration model for interaction features can assist programmers in interaction programming by analyzing and synthesizing interaction features. The agent-based middleware model provides a runtime framework for service multi-mode interaction. The programmable coordination media is able to effectively support software service coordination based on multimode interaction. To verify feasibility and efficiency of the above method, the design, implementation and performance analysis of Artemis-M3C, a multi-mode interaction middleware for software services, were introduced. The result shows that the above method is feasible and that the Artemis-M3C system is practical and effective in multi-mode interaction.     

Web services reengineer RFID system

EPCglobal combines RFID system and Web services to construct EPCglobal Network. Web services are going to reengineer RFID system from its initial closed-cycle application to the current open public service. The starting point is an overview of the framework of EPCglobal Network, which provides a public service, and details on five components function. After that, two main technologies are presented in ECPglobal Network and the equivalent technologies are analyzed in Web services. Finally, a practical instance of application in shipment is illustrated.     

QoS Analysis on Web Service Based Spatial Integration

Web Service is a standard-based software technology. It sets service-oriented development, deployment and integration as its basic jumping-off place, and has become the primary publishing mechanism and organization framework in the environment of distributed computing and services in Internet. Currently, especially in distributed applications of large scaled spatial information, due to user＇s strong dependence on data formats and platforms of certain GIS（Geographical Information Systems） manufacturer, there are obvious difficulty and complexity in inter-platform spatial information exchange and system development. In this paper, the concrete design and implementation of an integration and interoperation platform that aims to solve heterogeneity and on-line service for geographical information is presented first. This platform concentrates on implementation to shield heterogeneity among spatial data sources and services through a common spatial data transmission and exchange format-GML. In addition, QoS control for WebGIS Services of the integration and interoperation platform is expatiated from different aspects： cache mechanism, GML（Geography Markup Language） data compression, map on-line generation, etc.     

一种信息共享的主动服务框架

信息共享服务是Internet核心功能之一。提出了一种基于Internet与下一代广播网相互融合的信息共享主动服务框架,探讨了网络层次模型、业务流生成及内容解析等核心技术。该系统立足于Internet信息资源,通过对信息合理的收集、组织与分发,结合统一内容定位和信息过滤技术,实现个性化、主动化的信息服务。最后讨论了基于Web服务的信息订阅/发布主动服务系统的实现模型与实现框架。     

Scalable video transmission for the Internet

Information systems and distributed applications for the Internet show a growing demand for real-time audiovisual services. Support for those services within the Internet protocol layer will be widely available in the near future. Nevertheless, the heterogeneous structure of the Internet remains to be a great obstacle for establishing real-time video services. Scalable video codecs, generating bit-streams decodable at different rates, have been proposed to address the heterogeneity problem. In this article we present a scalable codec based on a spatio-temporal resolution pyramid combined with lattice vector quantization for efficient compression. With this approach additional lower bit-rate layers can be transmitted at the same overall bit-rate as needed by an H.263 single-layer transmission. The complexity of the codec is sufficiently low to allow software-only implementations of Internet video services. This is demonstrated on an Internet video server application.     

基于网络信息搜索的Web Service 文本描述信息扩充方法

随着Web服务技术的不断成熟和发展,互联网上出现了大量的公共Web服务.在使用Web服务开发软件系统的过程中,其文本描述信息(例如简介和使用说明等)可以帮助服务消费者直观有效地识别和理解Web服务并加以利用.已有的研究工作大多关注于从Web服务的WSDL文件中获取此类信息进行Web服务的发现或检索,调研发现,互联网上大部分Web服务的WSDL文件中普遍缺少甚至没有此类信息.为此,提出一种基于网络信息搜索的从WSDL文件之外的信息源为Web服务扩充文本描述信息的方法.从互联网上收集包含目标Web服务特征标识的相关网页,基于从网页中抽取出的信息片段,利用信息检索技术计算信息片段与目标Web服务的相关度,并选取相关度较高的文本片段为Web服务扩充文本描述信息.基于互联网上的真实数据进行的实验,其结果表明,可为约51％的互联网上的Web服务获取到相关网页,并为这些Web服务中约88％扩充文本描述信息.收集到的Web服务及其文本描述信息数据均已公开发布.     

基于状态相关的嵌入式因特网安全研究

一种有效嵌入式因特网安全架构的设计需要综合考虑到嵌入式因特网服务面对的所有安全威胁。本文分析了嵌入式因特网服务可能遭受的威胁,如拒绝服务、身份冒充、信息截取等,根据嵌入式因特网服务的特点,针对恶意的网络拒绝服务攻击,提出了基于状态相关的识别机制,以实现在不安全的网络环境下进行尽可能安全的服务。     

基于扩展标记语言的Internet市场的服务描述

作为一种应用系统从位于Internet上的远程服务结点获取数据和计算性服务并进行集成处理的机制,Internet市场受到了广泛重视.该文给出了一种基于扩展标记语言(extensible markup language,简称XML)的Internet市场服务描述方式.它较好地权衡了市场构架与顾客及服务提供者的观点.     

A measurement study on overhead distribution of value-added internet services

During the last two decades, several value-added services (e.g., IP multicast, IP traceback, etc.) have been proposed to extend the functional capabilities of the Internet. Due to the increasing role of these services, there is a need to better understand their impact on the network. In this paper, we present an experimental study on the intersection characteristics of end-to-end Internet paths and trees. We analyze these characteristics to understand the scale and the distribution of “state overhead” that is incurred on the routers by various value-added network services. For the reliability of our analysis, a representative, end-to-end router-level Internet map is essential. Although several maps are available, they are at best insufficient for our analysis. Therefore, in the first part of our work, we exert a measurement study and present an alternative approach to obtain an end-to-end router-level map conforming to our constraints. In the second part, we conduct various experiments using our map and shed some light on the scale and distribution of the state overhead of value-added Internet services in both unicast and multicast environments.     

Use Contexts for the Mobile Internet: A Longitudinal Study Monitoring Actual Use of Mobile Internet Services

The mobile Internet, which gives access to the World Wide Web through a mobile device, has been gaining in popularity. The mobile Internet differs from the traditional stationary Internet in that it can be used in a wider variety of contexts. However, no studies have identified the contexts in which mobile Internet services are used most frequently, or determined which contexts exert significant influence on a user's choice of mobile service. This article proposes a framework of use contexts that reflects the characteristics of the mobile Internet. To explore these contexts, a research method was devised and a longitudinal monitoring study was conducted. The results indicate that mobile Internet use is heavily clustered around a few key contexts, rather than dispersed widely over diverse contexts. Further, participants in the monitoring study were found to concentrate their use on a few mobile services, rather than on exploring diverse services. Perhaps most interestingly, some contextual factors were found to correlate closely with the selection of specific mobile Internet services. On the basis of these results, the article concludes with implications for developers of mobile Internet services.     

一个面向空间应用系统的Internet市场模型

集成Ｉｎｔｅｒｎｅｔ上大量自治的、异构的数据和计算资源将是今后软件业的主要挑战之一。作为一种应用系统从位于Ｉｎｔｅｒｎｅｔ上的远程服务结点获取数据并进行数据集成处理的机制,Ｉｎｔｅｒｎｅｔ市场越来越受到业界的重视。文中提出了一个面向空间应用的Ｉｎｔｅｒｎｅｔ市场模型ＳＭＡＲＴ,通过其提供的服务类型和服务提供圪理用户之间的交互方式描述了该模型。最后,讨论了ＳＭＡＲＴ市场模型的一个原型系统ＡＣＴ－ＴＡ     

基于Web服务的GIS系统构想

Internet的发展正在进入以服务为特征的第二代。Web服务概念的提出对Internet应用的发展产生了积极的影响,越来越多的公司和企业开始利用Web服务技术实现企业级应用和在Internet构建电子商务平台。该文结合当前Internet应用的发展趋势,分析了当前GIS应用的现状,提出了基于Web服务的GIS系统及其体系结构,并对该体系结构的特点和实现的关键技术作了介绍。     

A Historical Overview of Internet Reference Services for Distance Learners

SUMMARY

The advent of library services and collections on the Internet revolutionized reference services to students enrolled in distance learning programs. Prior to the Internet, reference librarians who supported distance learning programs had few methods, and many of them costly, to provide the equivalent library services advocated by the ACRL Guidelines. Through the Internet, these librarians were able to approximate the services and resources that had always been available to students who came into the library. This article describes the development of reference services on the Internet in a variety of libraries that support distance learners.