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检索条件"任意字段=Joint International Conference on Advances in Data and Web Management, APWeb/WAIM 2009"

共 109 条记录，以下是31-40 订阅

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Using link-based content analysis to measure document similarity effectively

Using link-based content analysis to measure document simila...

引用

joint international conference on advances in data and web management, apweb/waim 2009

作者： Li, Pei Li, Zhixu Liu, Hongyan He, Jun Du, Xiaoyong Key Labs of Data Engineering and Knowledge Engineering Ministry of Education China School of Information Renmin University of China Beijing China Department of Management Science and Engineering Tsinghua University Beijing China

ISBN: (纸本)9783642006715

Along with a massive amount of information being placed online, it is a challenge to exploit the internal and external information of documents when assessing similarity between them. A variety of approaches have been proposed to model the document similarity based on different foundations, but usually they are not applicable for combining internal and external information. In this paper, we introduce a link-based method into content analysis, which is based on random walk on graphs. By defining similarity as the meeting probability of two random surfers, we propose a computational model for content analysis, which can also be integrated with external information of documents. Empirical study shows that our method achieves good accuracy, acceptable performance and fast convergent rate in multi-relational document similarity measuring. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Computers

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Detecting abnormal trend evolution over multiple data streams

Detecting abnormal trend evolution over multiple data stream...

引用

joint international conference on advances in data and web management, apweb/waim 2009

作者： Zhang, Chen Weng, Nianlong Chang, Jianlong Zhou, Aoying Department of Computer Science and Engineering Fudan University CHN China ShangHai Stock Exchange CHN China ShangHai Telecom Company CHN China Software Engineering Institute of East China Normal University CHN China Shanghai Key Laboratory of Trustworthy Computering CHN China

ISBN: (纸本)9783642006715

In this paper, we present a method to trace evolution of trend over multiple data streams and detect the abnormal ones. First of all, a definition of trend for single data stream is provided, the advantage of our definition lies in its low time and space cost. Second, we improve a SVD-based method in order to select a pair of optimal initial parameters, then a novel chessboard named sketch is also illustrated aim at adjusting the parameters dynamically. Then, utilizing the skewness of trend distribution, an anomaly detection strategy is briefly introduced. Finally, we implement experiment on a variety of real data sets to illustrate effectiveness and efficiency of our approach. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Artificial intelligence

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Towards web services composition based on the mining and reasoning of their causal relationships

Towards web services composition based on the mining and rea...

引用

9th Asia-Pacific web conference/8th international conference on web-Age Information management (apweb/waim 2007)

作者： Yue, Kun Liu, Weiyi Li, Weihua Yunnan Univ Sch Informat Sci & Engn Dept Comp Sci & Engn Kunming 650091 Peoples R China

ISBN: (纸本)9783540724834

In this paper, a probabilistic graphical modeling approach for web services is proposed, and the web services Bayesian network (WSBN) is constructed by mining the historical invocations among them. Further, the semantic guidance to web services composition is generated based on the Markov blanket and causality reasoning in the WSBN. Preliminary experiments and performance analysis show that our approach is effective and feasible.

关键词： web services composition Bayesian network Markov blanket

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New balanced data allocating and online migrating algorithms in database cluster

New balanced data allocating and online migrating algorithms...

引用

joint international conference on advances in data and web management, apweb/waim 2009

作者： Gong, Weihua Yang, Lianghuai Huang, Decai Chen, Lijun College of Information Engineering Zhejiang University of Technology Hangzhou 310014 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

ISBN: (纸本)9783642006715

An improved range data distribution method is proposed, which is suitable for both the homogeneous and heterogeneous database cluster with consideration of full use of different computing resources of nodes. In order to avoid the problem of load imbalance caused by the hot accessing, an online migrating algorithm is presented during the parallel processing. The experimental results show that the improved range partition method and the rebalancing strategy of online migrating algorithm not only significantly improve the throughput of database cluster but also keep the balanced state well. At the same time, the cluster system has achieved better scalability. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Clustering algorithms

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A probabilistic reasoning approach for discovering web crawler sessions

A probabilistic reasoning approach for discovering web crawl...

引用

9th Asia-Pacific web conference/8th international conference on web-Age Information management (apweb/waim 2007)

作者： Stassopoulou, Athena Dikaiakos, Marios D. Department of Computer Science Intercollege Cyprus Department of Computer Science University of Cyprus Cyprus

ISBN: (纸本)9783540724834

In this paper we introduce a probabilistic-reasoning approach to detect web robots (crawlers) from human visitors of web sites. Our approach employs a Naive Bayes network to classify the HTTP sessions of a web-server access log as crawler or human induced. The Bayesian network combines various pieces of evidence that were shown to distinguish between crawler and human HTTP traffic. The parameters of the Bayesian network are determined with machine learning techniques, and the resulting classification is based on the maximum posterior probability of all classes, given the available evidence. Our method is applied on real web logs and provides a classification accuracy of 95%. The high accuracy with which our system detects crawler sessions, proves the robustness and effectiveness of the proposed methodology. © Springer-Vorlag Berlin Heidelberg 2007.

关键词： data mining

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Complete and equivalent query rewriting using views

Complete and equivalent query rewriting using views

引用

joint international conference on advances in data and web management, apweb/waim 2009

作者： Lu, Jianguo Li, Minghao Mylopoulos, John Cheung, Kenneth School of Computer Science University of Windsor Canada Department of Computer Science University of Toronto Canada IBM Toronto Lab Canada

ISBN: (纸本)9783642006715

Query rewriting using views is a technique for answering a query that exploits a set of views instead of accessing the database relations directly. There are two categories of rewritings, i.e., equivalent rewritings using materialized views applied in query optimization, and maximally contained rewritings used mainly in data integration. Although maximally contained rewritings are acceptable in data integration, there are cases where an equivalent rewriting is desired. More importantly, the maximally contained rewriting is a union of contained queries, many of which are redundant. This paper gives an efficient algorithm to find a complete and equivalent rewriting that is a single conjunctive query. We prove that the algorithm is guaranteed to find all the complete and equivalent rewritings, and that the resulting rewriting is guaranteed to be an equivalent one without additional containment checking. We also show that our algorithm is much faster than others through complexity analysis and experimentation. © Springer-Verlag Berlin Heidelberg 2009.

关键词： data integration

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Incremental computation for MEDIAN cubes in what-if analysis

Incremental computation for MEDIAN cubes in what-if analysis

引用

joint international conference on advances in data and web management, apweb/waim 2009

作者： Xiao, Yanqin Zhang, Yansong Wang, Shan Chen, Hong Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China MOE Beijing 100872 China School of Information Renmin University of China Beijing 100872 China Computer Center Hebei University Baoding Hebei 071002 China Department of Computer Science Harbin Finance College Harbin 150030 China

ISBN: (纸本)9783642006715

What-if analysis is an important type of DSS analysis processing procedure. It analyzes hypothetical scenarios based on historical data. The data cube view must be updated when the what-if condition is changed. Since source data must be kept in order to compute the new aggregate value when new tuples are inserted or deleted, in what-if analysis, incrementally computing a data cube for holistic aggregation functions is a difficult problem. In this paper, we adopt delta cube strategy and work area technique to incrementally compute data cube for MEDIAN function. The size of work area has important influence on the efficiency of the incremental computing. This paper optimizes the size of work area based on the number and the cardinality of dimension attributes of the cuboid. Performance study shows that our algorithms are effective over large databases. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Geometry

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Using structured tokens to identify webpages for data extraction

Using structured tokens to identify webpages for data extrac...

引用

9th Asia-Pacific web conference/8th international conference on web-Age Information management (apweb/waim 2007)

作者： Lin, Ling Zhou, Lizhu Guo, Qi Li, Gang Tsinghua Univ Beijing 100084 Peoples R China

ISBN: (纸本)9783540724834

As the web grows, more and more data has become available from webpages, such as the product items from the back-end databases. To provide efficient access to the data objects contained in these pages, data extraction plays an important role. However, identifying the suitable webpages to feed the data extraction is a pre-requisite and non-trivial task. As a result, there is an increasing need for methods that can automatically identify the target pages from unknown websites. In this paper, we solve the problem by exploiting the structured-token features of the webpage content, and applying decision tree based classification algorithm to induce the structure information. Furthermore, a preliminary recognition of data-object is acquired to efficiently initiate the subsequential data extraction. We experiment our approach on the real-world data, and achieve promising results.

关键词： websites

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advances in data and web management 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Qing Li Ling Feng Jian Pei Sean X. Wang Xiaofang Zhou Qiao-Ming Zhu

ISBN: (数字)9783642006722

ISBN: (纸本)9783642006715

This book constitutes the proceedings of the joint international conference apweb/waim 2009 which was held in Suzhou, China, during April 1-4, 2009. The 42 full papers presented together with 26 short papers and the abstracts of 2 keynote speeches were carefully reviewed and selected for inclusion in the book. The topics covered are query processing, topic-based techniques, web data processing, multidimensional data analysis, stream data processing, data mining and its applications, and data management support to advanced applications.

关键词： Computer Communication Networks data Mining and Knowledge Discovery Information Systems Applications (incl. Internet) Information Storage and Retrieval Pattern Recognition Information Systems and Communication Service

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A database Approach for Accelerate Video data Access

A Database Approach for Accelerate Video Data Access

引用

apweb/waim 2009 international Workshops

作者： Zhou, Wenjing Xie, Xiangwei Li, Hui Zhang, Xiao Wang, Shan Renmin Univ China Key Lab Data Engn & Knowledge Engn MOE Beijing 100872 Peoples R China

ISBN: (纸本)9783642039959

In this paper, we studied the efficiency and break-event point of storing video objects into DBMS and proved that storing "small" video objects into database is a suitable solution. To the video objects that stored in database as BLOB data type, we devised a database based time-oriented approach to speed up the video content access. Our experiments showed that, because of we extracted some system-aware metadata and stored into database transparently, the read performance was become practicable.

关键词： Video data Storage Video data Access Binary Large Object

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