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于戈, 王国仁, 金泰勇, 牧之内显文
软件学报,2002,13(4):720~725,-0001,():
-1年11月30日
FISH系统是一个用于支持先进应用(如GIS,EC,CIMS)的新一代分布式对象数据库系统。该系统采用了许多新颖技术,如DSVM(distributed shared virtual memory)、持久堆、页式对象、透明锁、紧凑提交等. 重点介绍了该系统的总体结构和设计思想,特别是FISH系统在WindowsNT上实现所涉及的底层技术,包括内存映射、共享内存、远程过程调用、多线索连接、页面故障处理等。基于007的性能测试表明,FISH系统在NT机群环境下取得了与在分布式UNIX环境下同样高的分布执行效率。
面向对象数据库, 服务器, 事务管JE, DSVM (, distributed shared virtual memory), , 007
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于戈, 吕建华†, 王国仁
软件学报,2003,14(9):1615~1620,-0001,():
-1年11月30日
路径表达式作为XML数据查询语言的核心部分,关于它的计算方法的研究成果已有很多,然而针对路径表达式本身进行优化的研究却相对较少。提出了两种针对路径表达式的优化策略:路径缩短策略和补路径策略,从而提高了XML路径查询效率。路径缩短策略根据XML文档模式信息,将路径表达式查询长度缩短,从而简化查询本身以降低需要的查询代价;而补路径策略则试图使用代价更小的等价路径表达式来替换原始查询。经过对实验数据的分析,这两种优化策略对于绝大多数路径表达式查询可以应用,并可大幅度地改进路径表达式的查询性能。
XML, 路径表达式, 查询处理, 查询代价, 查询优化
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【期刊论文】Web Users' Classification Using Fuzzy Neural Network
于戈, Fang Yuan, , Huanrui Wu, and Ge Yu
KES 2004, LNAI 3213, pp. 1030-1036, 2004.,-0001,():
-1年11月30日
With the increasing of data and Web users in the Internet, it is necessary and significant to identify users for offering further possible personalized services. To implement this goal, we used the users' surfing historical data stored in the Web log as features for classification. This paper aims to develop some techniques to achieve this objective using fuzzy neural networks (FNNs). Experimental results demonstrate the effectiveness of our proposed approach.
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【期刊论文】Modeling QoS for Semantic Equivalent Web Services*
于戈, Derong Shen, Ge Yu, Tiezheng Nie, Rui Li, and Xiaochun Yang
WAIM 2004, LNCS 3129, pp. 478-488, 2004.,-0001,():
-1年11月30日
Quality of Service (QoS) is an important factor for selecting a better Web service from numerous semantic equivalent Web services in Web services composition. In this paper, a QoS model (e-QoS) for evaluating semantic equivalent Web services is proposed, In which, the factors used to evaluate Web Services include Accessed Times, Invoked Success Rate, Average Responding Time, Stability Variance, and Customers Estimation. The performance of Web services in Latest Period of Time, the performance in history and the performance estimated by customers are considered together. By experiments, we concluded that e_QoS is effective for estimating Web services, and can improve the quality of web services composition greatly.
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【期刊论文】MMPClust: A Skew Prevention Algorithm for Model-Based Document Clustering*
于戈, Xiaoguang Li, Ge Yu, and Daling Wang
DASFAA 2005, LNCS 3453, pp. 536-547, 2005.,-0001,():
-1年11月30日
To support very high dimensionality, model-based clustering is an intuitive choice for document clustering. However, the current model-based algorithms are prone to generating the skewed clusters, which influence the quality of clustering seriously. In this paper, the reasons of skew are examined and determined as the inappropriate initial model, the unfitness of cluster model and the interaction between the decentralization of estimation samples and the over-generalized cluster model. This paper proposes a skew prevention document-clustering algorithm (MMPClust), which has two features: (1) a content-based cluster model is used to model the cluster better; (2) at the re-estimation step, a part of documents most relevant to its corresponding class are selected automatically for each cluster as the estimation samples to break this interaction. MMPClust has less restrictions and more applicability in document clustering than the previous methods.
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