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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71-80 订阅

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Continuous Skyline Tracking on Update data Streams

引用

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

作者： Tian, Li Wang, Le Li, AiPing Zou, Peng Jia, Yan Natl Univ Def Technol Sch Comp Changsha 410073 Hunan Peoples R China Natl Univ Def Technol Assoc Provost Educ Dept Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783540729082

We consider the continuous skyline computation in a new scenario named as update stream, where the First-In-First-Out rule (which is the basic character in sliding window model) does not hold, causing the existing algorithms inapplicable. An algorithm called BUSM is developed and analyzed, which can continuous Compute the change of skyline caused by update messages: then a progressive algorithm GUSM based oil a novel grid-indexed data structure is proposed, which makes use of the character that deletion and addition operation appears simultaneously in update streams, and represents the influence region by grids for early elimination. Analytical analysis and experimental evidences show the efficiency of proposed approaches.

关键词： skyline update data stream grid-indexed data structure

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An exhaustive and edge-removal algorithm to find cores in implicit communities

An exhaustive and edge-removal algorithm to find cores in im...

引用

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

作者： Yang, Nan Lin, Songxiang Gao, Qiang Renmin Univ China Sch Informat Zhongguancun St Beijing Peoples R China

ISBN: (纸本)9783540724834

web community is intensely studied in web resource discovery. Many literatures use core as the signature of a community. A core is a complete bipartite graphs, denoted as Ci,j. But discovery of all possible Ci,j in the web is a challenging job. This work has been investigated by trawling [1] [2]. Trawling employs repeated elimination/generation procedure until the graph is pruned to a satisfied state and then enumerate all possible Ci,j. We proposed a new method that uses exhaustive and edge removal method. Our algorithm avoids scanning dataset many times. Also, we improve crawling method by only recording potential fans to save disk space. The experiment result show that the new algorithm works properly and many new Ci,j can be found by our method.

关键词： web communities link analysis complete bipartite graph

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P-IDC: Information Security and Consideration in Building Internet data Centers for Pervasive Environment

引用

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

作者： Yang, Jae-min Kim, Jong-geun Im, Jong-in Korea Univ Ctr Informat Secur Technol Seoul South Korea Hanwha S&C IDC Serv Team Seoul South Korea

ISBN: (纸本)9783540729082

Internet data Center (IDC) offers servers and networks, and manages all contents in an enterprise. All servers should run 24 hours at no failure because the servers are very sensitive to keep their business continues. IDC has launched and operated already in many countries. IDC offers the enterprises to achieve their business goals and provides faster and safer service by converging all data services to one place for physical handling. In this paper, we propose Pervasive Internet data Center (P-IDC) for preservation of high security oil confidential information for large enterprises. The proposed model is appropriate for an enterprise which plans to build IDC and has many family companies in different business field. Definitely P-IDC should provide the solution to the problems ordinary IDC have.

关键词： Pervasive Internet data Center (P-IDC) Enterprise Internet data Center (E-IDC) Multi-point operating system Single-point operating system Risk analysis

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Mining invisible tasks from event logs

Mining invisible tasks from event logs

引用

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

作者： Wen, Lijie Wang, Jianmin Sun, Jiaguang Tsinghua Univ Sch Software Beijing 100084 Peoples R China

ISBN: (纸本)9783540724834

Most existing process mining algorithms have problems in dealing with invisible tasks. In this paper, a new process mining algorithm named alpha(#) is proposed, which extends the mining capacity of the classical alpha algorithm by supporting the detection of invisible tasks from event logs. Invisible tasks are first divided into four types according to their functional features, i.e., SIDE, SKIP, REDO and SWITCH. After that, the new ordering relation for detecting mendacious dependencies between tasks that reflects invisible tasks is introduced. Then the construction algorithms for invisible tasks of SIDE and SKIP/REDO/SWITCH types are proposed respectively. Finally, the alpha(#) algorithm constructs the mined process models incorporating invisible tasks in WF-net. A lot of experiments are done to evaluate the mining quality of the proposed alpha(#) algorithm and the results are promising.

关键词： Information management

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Dual Workflow Nets: Mixed Control/data-Flow Representation for Workflow Modeling and Verification

引用

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

作者： Fan, Shaokun Dou, Wanchun Chen, Jinjun Nanjing Univ State Key Lab Novel Software Technol Nanjing 210093 Peoples R China Nanjing Univ Dept Comp Sci & Technol Nanjing 210093 Peoples R China Swinburne Univ Technol Fac Informat & Commun technol Melbourne Vic Australia

ISBN: (纸本)9783540729082

A WFMS(workflow management system) contains two basic elements: the workflow model and the workflow engine. It is important to verify workflow models before they are put to execution. Traditional workflow models mainly describe workflows either from the control perspective or from the data perspective. In fact, the control flow and the data flow are two important aspects for workflow modeling and they are not independent from each other. A new workflow modeling technique, named Dual Workflow Nets (DWF-nets), is proposed to explicitly model the control flow and data flow of workflow processes. Besides, the control/data flow interactions can be captured in DWF-nets. Moreover, the control/data inconsistency, which is neglected by traditional modeling techniques, can be detected by verification of DWF-nets.

关键词： data flow analysis

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Effective density queries for moving objects in road networks

Effective density queries for moving objects in road network...

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

作者： Lai, Caifeng Wang, Ling Chen, Jidong Meng, Xiaofeng Zeitouni, Karine School of Information Renmin University of China Key Laboratory of Data Engineering and Knowledge Engineering MOE PRISM Versailles Saint-Quentin University France

ISBN: (纸本)9783540724834

Recent research has focused on density queries for moving objects in highly dynamic scenarios. An area is dense if the number of moving objects it contains is above some threshold. Monitoring dense areas has applications in traffic control systems, bandwidth management, collision probability evaluation, etc. All existing methods, however, assume the objects moving in the Euclidean space. In this paper, we study the density queries in road networks, where density computation is determined by the length of the road segment and the number of objects on it. We define an effective road-network density query guaranteeing to obtain useful answers. We then propose the cluster-based algorithm for the efficient computation of density queries for objects moving in road networks. Extensive experimental results show that our methods achieve high efficiency and accuracy for finding the dense areas in road networks. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Object recognition

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Adaptive scheduling strategy for data stream management system

Adaptive scheduling strategy for data stream management syst...

引用

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

作者： Sun, Guangzhong Zhou, Yipeng Huang, Yu Zhou, Yinghua Univ Sci & Technol China MOST Key Co Lab High Performance Comp & Its Appli Hefei 230027 Peoples R China

ISBN: (纸本)9783540724834

More and more applications involve processing continuous data streams, and the data stream management system (DSMS) is designed to deal with such data streams. Due to features of large volume and stochastic arrival, DSMS must process data stream efficiently in order to avoid system memory exhaustion and reduce the data access latency, to satisfy requirements of the application requirement. One of the key factors, which significantly impact the system performance significantly, is the scheduling strategy adopted by the DSMS. Chain scheduling is an operator-based scheduling strategy for DSMS, which has near-optimal in terms of run-time memory usage. FIFO strategy achieves optimal performance in terms of data access latency. Inspired by the two important scheduling strategies, Chain and FIFO, we propose two novel adaptive strategies for DSMS, ASCF and CSS, which efficiently deal with the varying input load in terms of both memory usage and data access latency. To give a fair comparison performance with other competing strategies, we design thorough simulation experiment and run different strategies under the same system environment. The outcomes of simulation experiment demonstrate the potential benefits and advantages of ASCF and CSC.

关键词： data stream management system scheduling adaptive strategy chain scheduling FIFO

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Mining web Transaction Patterns in an Electronic Commerce Environment

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

作者： Lee, Yue-Shi Yen, Show-Jane Ming Chuan Univ Dept Comp Sci & Informat Engn Gwei Shan Dist 333 Taoyuan County Taiwan

ISBN: (纸本)9783540729082

Association ride mining discovers most of the users' purchasing behaviors from transaction database. Association rules are valuable for cross-marking and attached mailing applications. Other applications include catalog design, add-on sales, store layout, and customer segmentation based on buying patterns. web traversal pattern mining discovers most of the users' access patterns from web logs. This information can provide navigation suggestions for web users such that appropriate actions can be adopted. web transaction pattern mining discovers not only the pure navigation behaviors but also the purchasing behaviors of customers. In this paper, we propose In algorithm IWA (Integrating web traversal patterns and Association rules) for mining web transaction patterns in the electronic commerce environment. Our IWA algorithm takes both the traveling and purchasing behaviors of customers into consideration at the same time. The experimental results show that IWA algorithm can simultaneously and efficiently discover traveling and purchasing behaviors for most of customers.

关键词： data mining

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A Grid Index Based Method for Continuous Constrained Skyline Query over data Stream

A Grid Index Based Method for Continuous Constrained Skyline...

引用

apweb/waim 2009 international Workshops

作者： Zhang, Li Jia, Yan Zou, Peng Natl Univ Def Technol Sch Comp Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783642039959

As an essential query, skyline computation over data stream is very important for many on-line applications, including mobile environment, network monitoring, communication, sensor network and stock market trading, etc. Different from most popular skyline processing methods that deal with the whole data set, this paper focuses on constrained skyline processing over data stream. We employ a grid based index to store the tuples and put forward two algorithms to compute and maintain skyline set based on it. We also define Influence Area for every query to minimize the cells need to be processed when new tuples arrive and old tuples expire. Theoretical analysis and experimental evidences show the efficiency of proposed approaches.

关键词： constrained skyline data stream grid index

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Managing a Geographic database from Mobile Devices Through OGC web Services

引用

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

作者： Brisaboa, Nieves R. Luaces, Miguel R. Parama, Jose R. Viqueira, Jose R. Univ A Coruna Database Lab Castro Elvina S-N La Coruna 15071 Spain Univ Santiago de Compostela Constantino Candeira Syst Lab E-15782 Salamanca Spain

ISBN: (纸本)9783540729082

We present in this paper a system for the management of geographic databases from mobile devices. The architecture of the system is extensible in the sense that it can be adapted to the particular characteristics of a wide variety of heterogenous mobile devices. This is achieved by the incorporation of an extensible middleware between the limited GIS applications running at the Mobile and the general purpose web services used at the data tier. The interfaces of these web services are compliant with the well-known web Map Service(WMS) and web Feature Service (WFS) specifications proposed by the Open Geospatial Consortium (OGC). A first prototype of the system for a specific PDA hardware with a specific software configuration was also implemented. We believe that the system has many practical applications in wireless environments with connectivity problems.

关键词： Mobile GIS data management web Geo-Services Open Geospatial Consortium WMS WFS

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