To construct mediators for data integration systems that integrate structured and semi-structured data, and to facilitate the reformulation and decomposition of the query, the presented system uses the XML processing ...To construct mediators for data integration systems that integrate structured and semi-structured data, and to facilitate the reformulation and decomposition of the query, the presented system uses the XML processing language (XPL) for the mediator. With XPL, it is easy to construct mediators for data integration based on XML, and it can accelerate the work in the mediator.展开更多
目前,大多数企业在信息化过程中遗留下来大量基于各种业务流程和异构数据库的应用系统,这些系统满足了企业某一特定的业务需求,但由于数据具有自身的特点,其他子系统很难使用别的子系统的数据,在企业内部产生了信息"孤岛",阻...目前,大多数企业在信息化过程中遗留下来大量基于各种业务流程和异构数据库的应用系统,这些系统满足了企业某一特定的业务需求,但由于数据具有自身的特点,其他子系统很难使用别的子系统的数据,在企业内部产生了信息"孤岛",阻碍了企业信息化进程。对企业异构数据源进行集成成为消除信息"孤岛"的有效途径。本文提出一种基于 Web 服务的异构数据库集成方法,以解决数据集成中的难题。展开更多
A heterogeneous wireless sensor network comprises a number of inexpensive energy constrained wireless sensor nodes which collect data from the sensing environment and transmit them toward the improved cluster head in ...A heterogeneous wireless sensor network comprises a number of inexpensive energy constrained wireless sensor nodes which collect data from the sensing environment and transmit them toward the improved cluster head in a coordinated way. Employing clustering techniques in such networks can achieve balanced energy consumption of member nodes and prolong the network lifetimes.In classical clustering techniques, clustering and in-cluster data routes are usually separated into independent operations. Although separate considerations of these two issues simplify the system design, it is often the non-optimal lifetime expectancy for wireless sensor networks. This paper proposes an integral framework that integrates these two correlated items in an interactive entirety. For that,we develop the clustering problems using nonlinear programming. Evolution process of clustering is provided in simulations. Results show that our joint-design proposal reaches the near optimal match between member nodes and cluster heads.展开更多
文摘To construct mediators for data integration systems that integrate structured and semi-structured data, and to facilitate the reformulation and decomposition of the query, the presented system uses the XML processing language (XPL) for the mediator. With XPL, it is easy to construct mediators for data integration based on XML, and it can accelerate the work in the mediator.
文摘目前,大多数企业在信息化过程中遗留下来大量基于各种业务流程和异构数据库的应用系统,这些系统满足了企业某一特定的业务需求,但由于数据具有自身的特点,其他子系统很难使用别的子系统的数据,在企业内部产生了信息"孤岛",阻碍了企业信息化进程。对企业异构数据源进行集成成为消除信息"孤岛"的有效途径。本文提出一种基于 Web 服务的异构数据库集成方法,以解决数据集成中的难题。
基金supported by National Natural Science Foundation of China(Nos.61304131 and 61402147)Grant of China Scholarship Council(No.201608130174)+2 种基金Natural Science Foundation of Hebei Province(Nos.F2016402054 and F2014402075)the Scientific Research Plan Projects of Hebei Education Department(Nos.BJ2014019,ZD2015087 and QN2015046)the Research Program of Talent Cultivation Project in Hebei Province(No.A2016002023)
文摘A heterogeneous wireless sensor network comprises a number of inexpensive energy constrained wireless sensor nodes which collect data from the sensing environment and transmit them toward the improved cluster head in a coordinated way. Employing clustering techniques in such networks can achieve balanced energy consumption of member nodes and prolong the network lifetimes.In classical clustering techniques, clustering and in-cluster data routes are usually separated into independent operations. Although separate considerations of these two issues simplify the system design, it is often the non-optimal lifetime expectancy for wireless sensor networks. This paper proposes an integral framework that integrates these two correlated items in an interactive entirety. For that,we develop the clustering problems using nonlinear programming. Evolution process of clustering is provided in simulations. Results show that our joint-design proposal reaches the near optimal match between member nodes and cluster heads.
