In order to solve the problem of modeling product configuration knowledge at the semantic level to successfully implement the mass customization strategy, an approach of ontology-based configuration knowledge modeling...In order to solve the problem of modeling product configuration knowledge at the semantic level to successfully implement the mass customization strategy, an approach of ontology-based configuration knowledge modeling, combining semantic web technologies, was proposed. A general configuration ontology was developed to provide a common concept structure for modeling configuration knowledge and rules of specific product domains. The OWL web ontology language and semantic web rule language （SWRL） were used to formally represent the configuration ontology, domain configuration knowledge and rules to enhance the consistency, maintainability and reusability of all the configuration knowledge. The configuration knowledge modeling of a customizable personal computer family shows that the approach can provide explicit, computerunderstandable knowledge semantics for specific product configuration domains and can efficiently support automatic configuration tasks of complex products.展开更多
The Web cluster has been a popular solution of network server system because of its scalability and cost effective ness. The cache configured in servers can result in increasing significantly performance, In this pape...The Web cluster has been a popular solution of network server system because of its scalability and cost effective ness. The cache configured in servers can result in increasing significantly performance, In this paper, we discuss the suitable configuration strategies for caching dynamic content by our experimental results. Considering the system itself can provide support for caching static Web page, such as computer memory cache and disk＇s own cache, we adopt a special pattern that only caches dynamic Web page in some experiments to enlarge cache space. The paper is introduced three different replacement algorithms in our cache proxy module to test the practical effects of caching dynamic pages under different conditions. The paper is chiefly analyzed the influences of generated time and accessed frequency on caching dynamic Web pages. The paper is also provided the detailed experiment results and main conclusions in the paper.展开更多
针对当前组态软件Web发布时安全性差、运行速度慢以及图形文件格式多样等问题,提出了基于AJAX(asynchronous JavaScript and XML)和SVG(scalable vector graphics)的组态软件Web发布模型。此模型在面向农产品安全生产管理的图形组态软...针对当前组态软件Web发布时安全性差、运行速度慢以及图形文件格式多样等问题,提出了基于AJAX(asynchronous JavaScript and XML)和SVG(scalable vector graphics)的组态软件Web发布模型。此模型在面向农产品安全生产管理的图形组态软件中实现并得到成功应用,采用基于XML的、文件大小比同等信息量的其它图形文件格式小得多的SVG作为组态软件的图形文件格式,以DWR(direct web remoting)实现组态数据从服务器端到客户端的无刷新传递,使用JavaScript+DOM(document object model)驱动SVG图形文件动态变化,该方法为组态实时画面的Web发布提供了一种有效的解决方案。展开更多
针对过去几年物联网以垂直行业应用为主,系统部署成本高,缺乏系统间跨行业的资源共享,用户只能被动接受服务,无法参与到服务的生成中,不利推广等问题,将Web技术作为Internet of Things实现和推广的手段,对目前国内外Web of Things工作...针对过去几年物联网以垂直行业应用为主,系统部署成本高,缺乏系统间跨行业的资源共享,用户只能被动接受服务,无法参与到服务的生成中,不利推广等问题,将Web技术作为Internet of Things实现和推广的手段,对目前国内外Web of Things工作进行了总结分析,提出了扁平化的Web of Things开放架构。首先分析了现有Inter-net of Things架构的不足和需求,并结合现有的Web of Things概念模型,提出了Web of Things开放架构和其中的关键技术、开放模式。最后,对Web of Things和Internet of Things进行了系统对比。展开更多
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 fore...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.展开更多
基金The National Natural Science Foundation of China(No.70471023).
文摘In order to solve the problem of modeling product configuration knowledge at the semantic level to successfully implement the mass customization strategy, an approach of ontology-based configuration knowledge modeling, combining semantic web technologies, was proposed. A general configuration ontology was developed to provide a common concept structure for modeling configuration knowledge and rules of specific product domains. The OWL web ontology language and semantic web rule language （SWRL） were used to formally represent the configuration ontology, domain configuration knowledge and rules to enhance the consistency, maintainability and reusability of all the configuration knowledge. The configuration knowledge modeling of a customizable personal computer family shows that the approach can provide explicit, computerunderstandable knowledge semantics for specific product configuration domains and can efficiently support automatic configuration tasks of complex products.
基金Supported by the National Natural Science Foun-dation of China (90204008)
文摘The Web cluster has been a popular solution of network server system because of its scalability and cost effective ness. The cache configured in servers can result in increasing significantly performance, In this paper, we discuss the suitable configuration strategies for caching dynamic content by our experimental results. Considering the system itself can provide support for caching static Web page, such as computer memory cache and disk＇s own cache, we adopt a special pattern that only caches dynamic Web page in some experiments to enlarge cache space. The paper is introduced three different replacement algorithms in our cache proxy module to test the practical effects of caching dynamic pages under different conditions. The paper is chiefly analyzed the influences of generated time and accessed frequency on caching dynamic Web pages. The paper is also provided the detailed experiment results and main conclusions in the paper.
文摘针对当前组态软件Web发布时安全性差、运行速度慢以及图形文件格式多样等问题,提出了基于AJAX(asynchronous JavaScript and XML)和SVG(scalable vector graphics)的组态软件Web发布模型。此模型在面向农产品安全生产管理的图形组态软件中实现并得到成功应用,采用基于XML的、文件大小比同等信息量的其它图形文件格式小得多的SVG作为组态软件的图形文件格式,以DWR(direct web remoting)实现组态数据从服务器端到客户端的无刷新传递,使用JavaScript+DOM(document object model)驱动SVG图形文件动态变化,该方法为组态实时画面的Web发布提供了一种有效的解决方案。
文摘针对过去几年物联网以垂直行业应用为主,系统部署成本高,缺乏系统间跨行业的资源共享,用户只能被动接受服务,无法参与到服务的生成中,不利推广等问题,将Web技术作为Internet of Things实现和推广的手段,对目前国内外Web of Things工作进行了总结分析,提出了扁平化的Web of Things开放架构。首先分析了现有Inter-net of Things架构的不足和需求,并结合现有的Web of Things概念模型,提出了Web of Things开放架构和其中的关键技术、开放模式。最后,对Web of Things和Internet of Things进行了系统对比。
基金the National 863 program (2003AA131020-06)the programme Young scientists from extra-European countries to Lower Saxony.
文摘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.
