Web service based spatial forest information system using an open source software approach

For technical and other reasons there is a dilemma that data providers cannot find an appropriate way to redistribute spatial forest data and data users who need spatial data cannot access and integrate available forest resources information. To overcome this dilemma, this paper proposed a spatial forest information system based on Web service using an open source software approach. With Web service based architecture, the system can enable interoperability, integrate Web services from other application servers, reuse codes, and shorten the development time and cost. At the same time, it is possible to extend the local system to a regional or national spatial forest information system. The growth of Open Source Software （OSS） provides an alternative choice to proprietary software for operating systems, web servers, Web-based GIS applications and database management systems. Using open source software to develop spatial forest information systems can greatly reduce the cost while providing high performance and sharing spatial forest information. We chose open source software to build a prototype system for Xixia County, Henan Province, China. By integrating OSS packages Deegree and UMN MapServer which are compliant to the OGC open specifications, the prototype system enables users to access spatial forest information and travelling information of Xixia County which come from two different data servers via a standard Web browser and promotes spatial forest information sharing.

Web Information Retrieval的分析与展望

网络的飞速发展使得网络信息检索成为人们迫切的需求。本文对网络信息检索技术进行了介绍、分析和比较,在此基础上,对未来的应用前景进行了展望。

Study on Information Exchange Platform for Port Logistics Based on Web Services

Information exchange platform(IEP)for port logistics is used to realize data transmission among different sys- tems and districts by Internet.This paper presents the web services technology used in transferring information for port logistics. The system architecture based on J2EE and B/S mode frame has been constructed to subscribe the distributed information.To en- sure platform independent,extensible markup language(XML)integration technology was also used in the system design.

Chaining Distributed Geographic Information Web Services Based on Ontology

To solve the problem of chaining distributed geographic information Web services （GI Web services）, this paper provides an ontology-based method. With this method, semantic service description can be achieved by semantic annotation of the elements in a Web service description language（WSDL） document with concepts of geographic ontology, and then a common under-standing about service semantics between customers and providers of Web services is built. Based on the decomposition and formalization of customer requirements, the discovery, composition and execution of GI Web services are explained in detail, and then a chaining of GI Web services is built and used to achieve the customer＇s requirement. Finally, an example based on Web ontology language for service （OWL-S） is provided for testing the feasibility of this method.

A Compositive Information Collection Platform System Based on Web Service

The aim is to solve the problem that how to share dispersive and heterogeneous data inside business information system or some other information source. On the basis of Web service, this paper adopts the notion of Data As ,Service to build service-oriented data integration architecture. According to this architecture, we develop data collection system which effectively integrates data from heterogeneous informa tion source and present a uniform data view to end users by implementing sharing data from heterogeneous systems and information source . At last, this paper gives an example of a compositive information collection platform system.

OrientI: A Strategy of Web Information Integration

We propose the OrientI approach for effectively building flexible applications on information integration. The system presents a fully visual development environment to build applications. With OrientI system, a user only needs to concentrate on the composition of components for building the InterPlan, and the detailed underlying operations and data streams are invisible to the user. A prototype system has been implemented and has partially proved the convenience brought by the OrientI approach. Key words Web - information integration - wrapper - XML - service CLC number TP 311.13 Foundation item: Supported by the 863 High Technology Foundation of China (2002AA116030), the Natural Science Foundation of China (60073014, 60273018), the Key Project of Chinese Ministry of Education (03044) and the Excellent Young Teachers Program of MOE, P.R.C. (EYTP)Biography: YI Lei(1980-), female, Master candidatc, research direction: Web information integration.

Web-services-based Integration Design of PDM and DNC Systems

In a networked manufacturing environment, product data integration is the foundation of collaborative manufacturing among manufacturing enterprises. It is very important to build an effective integration mechanism for product data sharing of manufacturing enterprises in geographically dispersed, heterogeneous system platform. In order to integrate enterprise level product data management (PDM) system and shop floor level distributed numerical control (DNC) system, based on the description of Web services technology, a Web-services-based integration approach is presented for facilitating seamless sharing of product data between PDM and DNC systems in a networked manufacturing environment. In order to verify the validity of the proposed approach, an example-based integration development has been implemented with Java 2 Software Development Kit and Java Web Services Developer Pack in Windows 2000 Professional environment.

A Survey of Web Information System and Applications

The fourth international conference on Web information systems and applications （WISA 2007） has received 409 submissions and has accepted 37 papers for publication in this issue. The papers cover broad research areas, including Web mining and data warehouse, Deep Web and Web integration, P2P networks, text processing and information retrieval, as well as Web Services and Web infrastructure. After briefly introducing the WISA conference, the survey outlines the current activities and future trends concerning Web information systems and applications based on the papers accepted for publication.

Web Information Retrieval： Problem and Prospects

The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there are a number of prospects that arise at the different levels where techniques, such as Usenet, support vector machine are employed to have a significant impact. The present investigations explore the number of problems identified its level and related to finding information on web. The authors have attempted to examine the issues and prospects by applying different methods such as web graph analysis, the retrieval and analysis of newsgroup postings and statistical methods for inferring meaning in text. The proposed model thus assists the users in finding the existing formation of data they need. The study proposes three heuristics model to characterize the balancing between query and feedback information, so that adaptive relevance feedback. The authors have made an attempt to discuss the parameter factors that are responsible for the efficient searching. The important parameters can be taken care of for the future extension or development of search engines.

Development of a Novel Media-independent Communication Theology for Accessing Local&Web-based Data:Case Study with Robotic Subsystems

Realizing media independence in today’s communication system remains an open problem by and large.Information retrieval,mostly through the Internet,is becoming the most demanding feature in technological progress and this web-based data access should ideally be in user-selective form.While blind-folded access of data through the World Wide Web is quite streamlined,the counter-half of the facet,namely,seamless access of information database pertaining to a specific end-device,e.g.robotic systems,is still in a formative stage.This paradigm of access as well as systematic query-based retrieval of data,related to the physical enddevice is very crucial in designing the Internet-based network control of the same in real-time.Moreover,this control of the end-device is directly linked up to the characteristics of three coupled metrics,namely,‘multiple databases’,‘multiple servers’and‘multiple inputs’(to each server).This triad,viz.database-input-server(DIS)plays a significant role in overall performance of the system,the background details of which is still very sketchy in global research community.This work addresses the technical issues associated with this theology,with specific reference to formalism of a customized DIS considering real-time delay analysis.The present paper delineates the developmental paradigms of novel multi-input multioutput communication semantics for retrieving web-based information from physical devices,namely,two representative robotic sub-systems in a coherent and homogeneous mode.The developed protocol can be entrusted for use in real-time in a complete user-friendly manner.

基于Web Services的GIS与应用模型集成研究

分析GIS与应用模型集成的研究现状及存在的问题。针对存在的问题,提出基于Web Services的GIS与应用模型集成方法。具体定义应用模型服务体系及其与空间信息服务体系的关系,讨论基于服务链的GIS-ervices与应用模型服务集成服务链样式、集成实现过程、集成开发流程,给出基于服务集成实现小流域地貌演化问题计算的服务集成分析设计与实验结果。实验结果证明本文提出的基于Web Services的GIS与应用模型集成方法正确可行。

一种可扩展的Web Service QoS管理框架

Web Service是目前研究界和产业界广泛关注的技术之一.随着Web Service的广泛应用,研究者们普遍认识到,服务的非功能属性,即服务质量(Quality of Service,QoS)是面向服务的应用能否成功的关键因素之一.因此,研究者们尝试从多个角度对QoS相关问题展开了研究.然而,现有工作普遍关注基于QoS的动态服务选择和组装等上层应用技术,而对于如何获取、存储、度量QoS等基础支持技术研究较少,而这些基础性工作对QoS相关的研究工作具有显著的重要性.此外,不同应用领域对Web Service QoS的需求不尽相同,因此,需要有一套灵活的机制支持在QoS模型定义、QoS度量方法、QoS信息采集等方面体现出的领域特性.针对这个问题,文中提出了一个可扩展的Web Service QoS信息管理框架,详细分析了该框架涉及到的重要方法与核心技术,并给出了该框架在北京大学软件构件库系统中的设计决策和方案.最后,介绍了文中框架在一个863计划项目中的应用实例,该实例展示了用户根据其应用的领域需求对本框架进行扩展并进行Web Service QoS管理的方法,从而验证了本管理框架的可扩展性及实用性.

基于Web Services的企业应用集成方法研究

企业应用集成是实现企业信息系统间集成的有效解决方法。分析了传统的和基于W eb Services的企业应用集成方法,指出基于W eb Services的企业应用集成是未来的发展趋势。利用W eb Services技术,建立了企业应用集成框架,并在J2EE平台上实现了该集成框架,最后给出了具体的企业应用集成实例。

Web Services构架下的空间应用集成框架

基于XML ,WebService,Ontology等技术的PAI集成框架包括Web应用层、集成层、分布的服务层和分布的信息层4层 其中集成层含有集成总线及AdapterService、元数据库和集成协调器与供二次开发的API及WebSer vice工具集,它实现了数据互操作、软件互操作与语义互操作集成总线是一组面向领域的编码标准与通信协议,是集成框架的核心;与总线标准不符的遗留系统和其他相关系统只需编写AdapterService就能被集成;元数据库用于管理系统中的所有信息与应用服务,屏蔽信息及服务的分布性与异构性;集成协调器用于数据的更新和元数据的管理;Ontology用于定义描述领域相关元数据的术语;数据交换格式与通信协议均用XML定义;所有应用通过SOAP协议实现互操作该集成框架实现了大规模空间信息及服务的动态集成,能保护已有投资,并能集成网上丰富的商业WebService ,是一个开放的可扩充的框架 文中还介绍了PAI集成框架实现的初步成果。

基于Web Services的分布式GIS集成框架

分析了GIS的发展方向和WebServices的优势,在此基础上提出了一个基于WebServices的分布式GIS系统集成框架,并讨论了其中涉及到的关键技术,给出了一个实例和进一步的研究方向。

基于Web Services实现异构数据库集成技术研究

从企业信息集成面临的问题出发,分析了企业应用集成的目标、存在的问题以及目前已有的异构数据库集成技术,在此基础上提出了基于W eb Services实现异构数据库集成的体系框架,对其实现过程中的关键技术给出了详细描述。以实际项目为例介绍了所研究的方案如何运用于实际应用中。

基于Web Service的企业知识管理研究

在分析企业知识管理的定义、内容、过程及需求的基础上得出当今知识管理的关键点在于不同企业、不同地区的知识及信息的共享,并且提出了基于Web service的松散耦合的企业知识管理框架,为企业信息化的发展提供了完善的应用集成解决方案。

基于Web Service进行信息共享和集成的关键技术

由于Web Service是基于标准协议和规范(包括HTTP、SOAP、XML、WSDL、UDDI等),并且平台独立和语言独立的,因此WebService已成为基于Internet网进行信息交换、信息共享、信息集成和互操作的主流技术,在电子商务和电子政务中被广泛应用。详细介绍了基于WebService进行信息共享和集成的关键技术——WebService异步调用技术和动态调用技术。通过Web Service异步调用技术,实现了Web Service的分布式并行执行,提高了计算的效率。通过Web Service动态调用技术,使整个软件系统具有可扩充性,并且易于维护,能满足Internet环境动态性的要求。

基于Web Services异构系统信息融合平台

采用了WebServices技术构建动态信息通道,将处于异地的各类异构信息经过统一的信息融合平台进行整合处理,按照用户的要求及时地、源源不断地输送到用户终端中,保证了信息的完整存储、快速传递、准确分析,为各级部门的科学决策奠定基础。