一种轻量级Web服务组合研究与应用

Web服务作为一种新兴的Web应用模式受到了软件工程领域的广泛关注，其提供了一个解决异构平台上的应用之间连接、集成和互操作的技术框架。Web服务组合是将多个服务组合成一个能完成复杂商业任务的技术。该文给出了一种基于SOAP/WSDL的轻量级Web服务组合构架，用其解决了三峡—葛洲坝水利枢纽通航调度项目中异构平台上的数据和应用的整合与共享问题。     

基于负载性能指标的Web测试

研究了资源占用率、响应时间、并发用户和思考时间等Web应用的性能指标。负载测试是Web应用系统测试的一个重要方面,有助于确认被测系统的性能需求和负载增长情况,发现系统的异常。提出了负载测试一般方案,应用LoadRunner测试工具,测试了学习交流在线系统,分析了事务、网络、系统响应时间等指标。     

基于SOA的数据共享与交换平台

为适应企业业务流程频繁变更的需要,基于Web服务和企业服务总线技术,构建一个面向服务架构的数据共享与交换平台,通过该平台实现跨部门应用间的数据交换和信息共享。利用该平台的设计实例解决企业实际运营中的产品信息不一致问题。     

Weak signal identification with semantic web mining

We investigate an automated identification of weak signals according to Ansoff to improve strategic planning and technological forecasting. Literature shows that weak signals can be found in the organization’s environment and that they appear in different contexts. We use internet information to represent organization’s environment and we select these websites that are related to a given hypothesis. In contrast to related research, a methodology is provided that uses latent semantic indexing (LSI) for the identification of weak signals. This improves existing knowledge based approaches because LSI considers the aspects of meaning and thus, it is able to identify similar textual patterns in different contexts. A new weak signal maximization approach is introduced that replaces the commonly used prediction modeling approach in LSI. It enables to calculate the largest number of relevant weak signals represented by singular value decomposition (SVD) dimensions. A case study identifies and analyses weak signals to predict trends in the field of on-site medical oxygen production. This supports the planning of research and development (R&D) for a medical oxygen supplier. As a result, it is shown that the proposed methodology enables organizations to identify weak signals from the internet for a given hypothesis. This helps strategic planners to react ahead of time.     

A method for the acquisition of ontology-based user profiles

User profiles play an important role in information retrieval system. In this paper, we propose a novel method for the acquisition of ontology-based user profiles. In the method, the ontology-based user profiles can maintain the representations of personal interest. In addition, user ontologies can be automatically constructed. The method can make user profiles strong expressive and less manually interfered.     

Hyperwelcome

Web page annotation and adaptive navigation support are two active, but independent research directions focused on the same goal: expanding the functionality of the Web as a hypertext system. The goal of the AnnotatEd system presented in this paper has been to integrate annotation and adaptive navigation support into a single value-added service where the components can reinforce each other and create new unique attributes. This paper describes the implementation of AnnotatEd from early prototypes to the current version, which has been explored in several contexts. We summarize some lessons we learned during the development process and which defined the current functionality of the system. We also present the results of several classroom studies of the system. These results demonstrate the importance of the browsing-based information access supported by AnnotatEd and the value of both the annotation and navigation support functionalities offered by the system.     

Towards an integrated Flood Information System: Centralized data access,analysis, and visualization

The Iowa Flood Information System (IFIS) is a web-based platform developed at the Iowa Flood Center (IFC) in order to provide access to flood inundation maps, real-time flood conditions, flood forecasts, flood-related data, information, applications, and interactive visualizations for communities in Iowa. The IFIS provides community-centric watershed and river characteristics, rainfall conditions, and stream-flow data and visualization tools. Interactive interfaces allow access to inundation maps for different stage and return period values as well as to flooding scenarios with contributions from multiple rivers. Real-time and historical data of water levels, gauge heights, hourly and seasonal flood forecasts, and rainfall conditions are made available by integrating data from NEXRAD radars, IFC stream sensors, and USGS and National Weather Service (NWS) stream gauges. The IFIS provides customized flood-related data, information, and visualization for over 1000 communities in Iowa. To help reduce the damage from floods, the IFIS helps communities make better-informed decisions about the occurrence of floods and alerts communities in advance using NWS and IFC forecasts. The integrated and modular design and structure of the IFIS allows easy adaptation of the system in other regional and scientific domains. This paper provides an overview of the design and capabilities of the IFIS that was developed as a platform to provide one-stop access to flood-related information.     

Key choices in the design of Simple Knowledge Organization System (SKOS)

Simple Knowledge Organization System (SKOS) provides a data model and vocabulary for expressing Knowledge Organization Systems (KOSs) such as thesauri and classification schemes in Semantic Web applications. This paper presents the main components of SKOS and their formal expression in Web Ontology Language (OWL), providing an extensive account of the design decisions taken by the Semantic Web Deployment (SWD) Working Group of the World Wide Web Consortium (W3C), which between 2006 and 2009 brought SKOS to the status of W3C Recommendation. The paper explains key design principles such as “minimal ontological commitment” and systematically cites the requirements and issues that influenced the design of SKOS components.By reconstructing the discussion around alternative features and design options and presenting the rationale for design decisions, the paper aims at providing insight into how SKOS turned out as it did, and why. Assuming that SKOS, like any other successful technology, may eventually be subject to revision and improvement, the critical account offered here may help future editors approach such a task with deeper understanding.     

WEB环境下基于角色的透明访问控制

本文在对WEB环境下实现基于角色的访问控制构架和安全Cookie进行研究的基础上,提出了WEB环境下实现基于角色的透明访问控制模型,并使用该模型实现了同一域名下多站点间的基于角色的透明访问控制。     

十堰电视台六个标清频道全硬盘播出系统

本文介绍了十堰电视台六个标清频道全硬盘播出系统的组成及功能,详解了视频服务器、数据库服务器、MDC服务器兼同步迁移服务器、控制工作站、上载工作站、摆渡系统、时钟和同步系统等关键技术。