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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"

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Improvements of HITS algorithms for spam links

Improvements of HITS algorithms for spam links

引用

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

作者： Asano, Yasuhito Tezuka, Yu Nishizeki, Takao Tokyo Denki Univ Hatoyama Cho Hiki Gun Saitama Japan Tohoku Univ Sendai Miyagi 980 Japan

ISBN: (纸本)9783540724834

The HITS algorithm proposed by Kleinberg is one of the representative methods of scoring web pages by using hyperlinks. In the days when the algorithm was proposed, most of the pages given high score by the algorithm were really related to a given topic, and hence the algorithm could be used to find related pages. However, the algorithm and the variants including BHITS proposed by Bharat and Henzinger cannot be used to find related pages any more on today's web, due to an increase of spam links. In this paper, we first propose three methods to find "linkfarms," that is, sets of spam links forming a densely connected subgraph of a web graph. We then present an algorithm, called a trust-score algorithm, to give high scores to pages which are not spam pages with a high probability. Combining the three methods and the trust-score algorithm with BHITS, we obtain several variants of the HITS algorithm. We ascertain by experiments that one of them, named TaN+BHITS using the trust-score algorithm and the method of finding linkfarm by employing name servers, is most suitable for finding related pages on today's web. Our algorithms take time and memory no more than those required by the original HITS algorithm, and can be executed on a PC with a small amount of main memory.

关键词： web services

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Efficient keyword search over data-centric XML documents

Efficient keyword search over data-centric XML documents

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

作者： Li, Guoliang Feng, Jianhua Ta, Na Zhou, Lizhu Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China

ISBN: (纸本)9783540724834

We in this paper investigate keyword search over data-centric XML documents. We first present a novel method to divide an XML document into self-integrated subtrees, which are connected subtrees and can capture different structural information of the XML document. We then propose the meaningful self-integrated trees, which contain all the keywords and describe how the keywords are interrelated, to answer keyword search over XML documents. In addition, we introduce the B+-tree index to accelerate the retrieval of those meaningful self-integrated trees. Moreover, to further enhance the performance of keyword search, we present Bloom Filter to improve the efficiency of generating those meaningful self-integrated trees. Finally, we conducted extensive experiments to evaluate the performance of our method, and the experimental results demonstrate that our method achieves high efficiency and outperforms the existing approaches significantly.

关键词： XML

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Dynamic data migration policies for query-intensive distributed data environments

Dynamic data migration policies for query-intensive distribu...

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

作者： Wang, Tengjiao Yang, Bishan Huang, Allen Zhang, Qi Gao, Jun Yang, Dongqing Tang, Shiwei Niu, Jinzhong Key Laboratory of High Confidence Software Technologies Peking University Ministry of Education China Microsoft SQL China R and D Center China Computer Science Graduate School and University Center City University of New York 365 5th Avenue NY 10016 United States

ISBN: (纸本)9783642006715

Modern large distributed applications, such as telecommunication and banking services, need to respond instantly to a huge number of queries within a short period of time. The data-intensive, query-intensive nature makes it necessary to build these applications in a distributed data environment that involves a number of data servers sharing service load. How data is distributed among the servers has a crucial impact on the system response time. This paper introduces two policies that dynamically migrate data in such an environment as the pattern of queries on data changes, and achieve query load balance. One policy is based on a central controller that periodically collects the query load information on all data servers and regulates data migration across the whole system. The other policy lets individual server dynamically selects a partner to migrate data and balance query load in between. Experimental results show that both policies significantly improve system performance in terms of average query response time and fairness, and communication overhead incurred is marginal. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Search engines

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A User Study on the Adoption of Location Based Services

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

作者： Chang, Shuchih Ernest Hsieh, Ying-Jiun Lee, Tzong-Ru Liao, Chun-Kuei Wang, Shiau-Ting Natl Chung Hsing Univ Grad Inst Technol & Innovat Management 250 Kuo Kuang Rd Taichung 402 Taiwan Natl Chung Hsing Univ Inst Elect Commerce Taichung 402 Taiwan Natl Chung Hsing Univ Grad Inst Technol & Innovat Management Taichung 402 Taiwan Natl Chung Hsing Univ Dept Mkt Taichung 402 Taiwan Natl Chung Hsing Univ Inst Elect Commerce Taichung 402 Taiwan

ISBN: (纸本)9783540729082

Based on the end user's exact location, providing useful information and location based services (LBS) through wireless pervasive devices at right place and right time could be beneficial to both businesses and their customers. However, the adoption rates of these location-aware pervasive services from the consumption side are still low, implying that there might be some reasons keeping the potential users away from using LBS. This research attempted to find out such reasons by investigating what factors would negatively influence users' adoption of LBS. A hybrid approach, integrating a qualitative method, ZMET, with the quantitative data analysis of the samples collected from a subsequent questionnaire survey, was designed and implemented in this study to elicit and validate potential LBS users' in-depth feelings. Our study results show that cost. worry of security & privacy Issues, worry of quality of LBS information, and lack of cognition of LBS are the barriers impeding mobile service users' adoption of LBS applications. Our findings can be referenced by service providers for the purpose of the design and development of successful business applications to catch the revolutionary opportunity and benefit of LBS.

关键词： web services

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Meta Galaxy: A Flexible and Efficient Cube Model for data Retrieval in OLAP

Meta Galaxy: A Flexible and Efficient Cube Model for Data Re...

引用

apweb/waim 2009 international Workshops

作者： Zuo, Jie Tang, Changjie Duan, Lei Wang, Yue Tang, Liang Zhang, Tianqing Zhu, Jun Sichuan Univ Sch Comp Sci Chengdu 610065 Peoples R China Natl Ctr Birth Defects Monitoring Chengdu 610041 Peoples R China

ISBN: (纸本)9783642039959

OLAP is widely used in data analysis. The existing design models, such as star schema and snowflake schema, are not flexible when the data model is changed. For example, the task for inserting a dimension may involve complex operations over model and application implementation. To deal with this problem, a new cube model, called Meta Galaxy, is proposed. The main contributions of this work include: (1) analyzing the shortcoming of traditional design method, (2) proposing a new cube model which is flexible for dimension changes, and (3) designing an index structure and an algorithm to accelerate the cube query. The time complexity of query algorithm is linear. The extensive experiments on the real application and synthetic dataset show that Meta Galaxy is effective and efficient for cube query. Specifically, our method decreases the storage size by 95.12%, decreases the query time by 89.89% in average compared with SQL Server 2005, and has good scalability on data size.

关键词： Galaxies

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ScaMMDB: Facing Challenge of Mass data Processing with MMDB

ScaMMDB: Facing Challenge of Mass Data Processing with MMDB

引用

apweb/waim 2009 international Workshops

作者： Zhang, Yansong Xiao, Yanqin Wang, Zhanwei Ji, Xiaodong Huang, Yunkui Wang, Shan Renmin Univ China Key Lab Minist Educ Data Engn & Knowledge Engn Beijing 100872 Peoples R China

ISBN: (纸本)9783642039959

Main memory database(MMDB) has much higher performance than disk resident database(DRDB), but the architecture of hardware limits the scalability of memory capacity. In OLAP applications, comparing with data volume, main memory capacity is not big enough and it is hard to extend. In this paper, ScaMMDB prototype is proposed towards the scalability of MMDB. A multi-node structure is established to enable system to adjust total main memory capacity dynamically when new nodes enter the system or some nodes leave the system. ScaMMDB is based on open source MonetDB which is a typical column storage model MMDB, column data transmission module, column data distribution module and query execution plan re-writing module are developed directly in MonetDB. Any node in ScaMMDB can response user's requirements and SQL statements are transformed automatically into extended column operating commands including local commands and remote call commands. Operation upon certain column is pushed into the node where column is stored, current node acts as temporarily mediator to call remote commands and assembles the results of each column operations. ScaMMDB is a test bed for scalability of MMDB, it can extend to MMDB cluster, MMDB replication server, even peer-to-peer OLAP server for further applications.

关键词： Scalability

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Efficient Multiple Objects-Oriented Event Detection Over RFID data Streams

Efficient Multiple Objects-Oriented Event Detection Over RFI...

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11th international conference on web-Age Information management (waim 2010)

作者： Peng, Shanglian Li, Zhanhuai Li, Qiang Chen, Qun Liu, Hailong Nie, Yanming Pan, Wei Northwestern Polytech Univ Sch Comp Sci & Technol Xian 710072 Peoples R China Northwestern Polytech Univ Coll Software & Microelect Xian 710072 Peoples R China

ISBN: (纸本)9783642142451

Complex event processing has been extensively applied in areas such as RFID tracking for supply chain management, fluctuation detection in stock trading, real-till-le intrusion detection in network monitoring, etc. Most existing research works focus on specification, formalization and evaluation of single-object oriented complex event processing. In this paper, we investigate complex event processing problems over multiple correlated RE ID objects. We study multiple correlated RFID event detection problems. We present two kinds of evaluation algorithms: SEquence Join Algorithm(SEJA) and Stream Join Algorithm(SJA). Experimental studies demonstrate, that our proposed algorithms are effective and scalable.

关键词： complex event processing NFA data stream RFID

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StreetTiVo: Using a P2P xml database system to manage multimedia data in your living room

StreetTiVo: Using a P2P xml database system to manage multim...

引用

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

作者： Zhang, Ying Vries, Arjen De Boncz, Peter Hiemstra, Djoerd Ordelman, Roeland Centrum voor Wiskunde en Informatica Amsterdam Netherlands Delft University of Technology Delft Netherlands University of Twente Enschede Netherlands

ISBN: (纸本)9783642006715

StreetTiVo is a project that aims at bringing research results into the living room;in particular, a mix of current results in the areas of Peer-to-Peer XML database management System (P2P XDBMS), advanced multimedia analysis techniques, and advanced information retrieval techniques. The project develops a plug-in application for the so-called Home Theatre PCs, such as set-top boxes with MythTV or Windows Media Center Edition installed, that can be considered as programmable digital video recorders. StreetTiVo distributes computeintensive multimedia analysis tasks over multiple peers (i.e., StreetTiVo users) that have recorded the same TV program, such that a user can search in the content of a recorded TV program shortly after its broadcasting;i.e., it enables near real-time availability of the meta-data (e.g., speech recognition) required for searching the recorded content. Street- TiVo relies on our P2P XDBMS technology, which in turn is based on a DHT overlay network, for distributed collaborator discovery, work coordination and meta-data exchange in a volatile WAN environment. The technologies of video analysis and information retrieval are seamlessly integrated into the system as XQuery functions. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Metadata

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advances in Conceptual Modeling - Challenging Perspectives 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Carlos Alberto Heuser Günther Pernul

ISBN: (数字)9783642049477

ISBN: (纸本)9783642049460

This book constitutes the refereed joint proceedings of eight international workshops held in conjunction with the 28th international conference on Conceptual Modeling, ER 2009, in Gramado, Brazil, in November 2009. The 33 revised full papers presented were carefully reviewed and selected from 100 submissions. Topics addressed by the workshops are active conceptual modeling of learning (ACM-L), conceptual modeling in the large (CoMoL), evolving theories of conceptual modeling (ETheCoM), workshop on foundations and practices of UML (FP-UML), joint international workshop on metamodels, ontologies, semantic technologies, and information systems for the semantic web (MOST-ONISW), quality of information systems (QoIS), requirements, Intentions and goals in conceptual modeling ( RIGiM) and semantic and conceptual issues in geographic information systems (SeCoGIS).

关键词： Software Engineering/Programming and Operating Systems Information Storage and Retrieval data Mining and Knowledge Discovery Software Engineering Programming Techniques database management

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