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检索条件"任意字段=12th International Conference on Database Systems for Advanced Applications, DASFAA 2007"

共 37 条记录，以下是1-10 订阅

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Advances in databases: Concepts, systems and applications: 12th international conference on database systems for advanced applications, dasfaa 2007 Proceedings

引用

12th international conference on database systems for advanced applications, dasfaa 2007

ISBN: (纸本)9783540717027

the proceedings contain 110 papers. the topics discussed include: improving quality and convergence of genetic query optimizers;a path-based approach for efficient structural join with not-predicates;ITREKS: keyword search over relational database by indexing tuple relationship;mining closed frequent free trees in graph databases;mining time-delayed associations from discrete event datasets;a comparative study of ontology based term similarity measures on PubMed document clustering;an adaptive and efficient unsupervised shot clustering algorithm for sports video;correlation-based detection of attribute outliers;an efficient histogram method for outlier detection;privacy preserving data mining of sequential patterns for network traffic data;privacy preserving clustering for multi-party;an efficient implementation for MOLAP basic data structure and its evaluation;and similarity joins of text with incomplete information formats.

关键词： database systems

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FAIth: A Fast, Accurate, and Lightweight database-Agnostic Learned Cost Model 10th

FAITH: A Fast, Accurate, and Lightweight Database-Agnostic L...

引用

29th international conference on database systems for advanced applications (dasfaa)

作者： Li, Waner Chen, Xu Liang, Zibo Ye, Runfan Lai, Ruyi Yue, Siying Su, Qinyuan Zheng, Kai Su, Han Wu, Shaozhi Sch Comp Sci & Engn Chengdu Peoples R China Univ Elect Sci & Technol China Yangtze Delta Reg Inst Quzhou Quzhou Peoples R China Huaxin Consulting Co Ltd Cape Town South Africa China Telecom Co Ltd Beijing Peoples R China

ISBN: (纸本)9789819609130;9789819609147

In recent years, there has been a notable rise in the application of machine learning to cost estimation for query optimization. Central to an effective cost model are the abilities of accuracy, efficiency, lightness, and generalizability. However, traditional cost models are based on heuristics thus lack of accuracy. On the other hand, the learned cost models frequently struggle to strike a balance between accuracy and efficiency, with many lacking broad applicability. To combat these challenges, we introduce FAIth, a fast, accurate, and database-agnostic learned cost model. FAIth harnesses data from multiple sources to learn cross-database meta-knowledge. It is then effectively refined, leveraging the unique data information from the target database via an Adapter we developed. Proven through various benchmarks, FAIth consistently showcases its prowess in delivering accurate and robust cost estimations.

关键词： Cost estimation Machine learning Query optimization

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Advances in databases: Concepts, systems and applications 1

引用

丛书名： Lecture Notes in Computer Science

1000年

ISBN: (数字)9783540717034

ISBN: (纸本)9783540717027

the 12th international conference on database systems for advanced applications (dasfaa), organized jointly by the Asian Institute of Technology, National Electronics and Computer Technology Center and Sirindhorn international Institute of Technology, sought to provide information to users and practitioners of database and database systems on advanced applications. the dasfaa conference series has already established itself and it continues to attract, each year, participants from all over the world. In this context, it may be recalled that the previous dasfaa conferences were successfully held in Seoul, Korea (1989), Tokyo, Japan (1991), Daejeon, Korea (1993), Singapore (1995), Melbourne, Australia (1997), Taiwan, ROC (1999), Hong Kong (2001), Kyoto, Japan (2003), Jeju Island, Korea (2004), Beijing, China (2005) and Singapore (2006). thailand had the opportunity to host this prestigious and important international conference and join the league. this conference provides an international forum for academic exchanges and technical discussions among researchers, developers and users of databases from academia, business and industry. dasfaa focuses on research in database theory, development of advanced DBMS technologies and their advanced applications. It also promotes research and development activities in the field of databases among participants and their institutions from Pacific Asia and the rest of the world .

关键词： User Interfaces and Human Computer Interaction Computer applications Computer Engineering database Management Data Mining and Knowledge Discovery Information Storage and Retrieval

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OntoDB: It is time to embed your domain ontology in your database

引用

12th international conference on database systems for advanced applications, dasfaa 2007

作者： Jean, Stéphane Dehainsala, Hondjack Dung, Nguyen Xuan Pierra, Guy Bellatreche, Ladjel Aït-Ameur, Yamine LISI ENSMA Poitiers University France

ISBN: (纸本)9783540717027

this demonstration presents OntoDB, a prototype that allows to store explicitly in the database not only the data, but also the conceptual model defining the structure of data and the domain ontology representing the meaning of data. the demonstration illustrates three main functionalities of OntoDB: (1) a storage of a domain ontology and database content in the same repository, (2) the possibility of querying databases at ontology level, and (3) an automatic integration of heterogeneous data sources referencing/extending the same domain ontology. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Ontology

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Geo-WDBMS: An improved DBMS with the function of watermarking geographical data

引用

12th international conference on database systems for advanced applications, dasfaa 2007

作者： Min, Huang Xiang, Zhou Jiaheng, Cao Zhiyong, Peng Computer School Wuhan University Wuhan 430072 China State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China

ISBN: (纸本)9783540717027

this paper focuses on the issue of geographical data's copyrights protection. A Geo-WDBMS has been built by embedding the watermarking functions into the inner code of the open source DBMS PostgreSQL. And its core watermarking mechanism is to insert and detect mark bits in the coordinates of the vertices in geographical objects using the methods of classifying and twice majority-voting. Further more, error correcting mechanism is used to enhance the resilience of the system and blind watermark is realized. Experiments on watermarking digital maps showed that the marked maps are inconspicuous and robust to various attacks. © Springer-Verlag Berlin Heidelberg 2007.

关键词： database systems

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ITREKS: Keyword search over relational database by indexing tuple relationship

引用

12th international conference on database systems for advanced applications, dasfaa 2007

作者： Jiang, Zhan Shan, Wang School of Information Renmin University of China Beijing 100872 China MOE Beijing 100872 China

ISBN: (纸本)9783540717027

Keyword-based search is well studied in the world of text documents and Internet search engines. While traditional database management systems offer powerful query languages, they do not allow keyword-based search. In this paper, we discussed ITREKS, a system that support efficient keyword-based search over relational database by indexing tuple relationship: A basic database tuple relationship, FDJT, is established in advance. then a FDJT-Tuple-Index table is created, which records relationships between each tuple and FDJT. At query time, for each of keywords, system first finds tuples in every relation that contain it, using full text indexes offered by database management system. then use FDJT-Tuple-Index table to find the joinable tuples contain all keywords in the query. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Search engines

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Mining closed frequent free trees in graph databases

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12th international conference on database systems for advanced applications, dasfaa 2007

作者： Peixiang, Zhao Jeffrey, Xu Yu Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9783540717027

Free tree, as a special graph which is connected, undirected and acyclic, has been extensively used in bioinformatics, pattern recognition, computer networks, XML databases, etc. Recent research on structural pattern mining has focused on an important problem of discovering frequent free trees in large graph databases. However, it can be prohibitive due to the presence of an exponential number of frequent free trees in the graph database. In this paper, we propose a computationally efficient algorithm that discovers only closed frequent free trees in a database of labeled graphs. A free tree t is closed if there exist no supertrees of t that has the same frequency of t. Two pruning algorithms, the safe position pruning and the safe label pruning, are proposed to efficiently detect unsatisfactory search spaces with no closed frequent free trees generated. Based on the special characteristics of free tree, the automorphism-based pruning and the canonical mapping-based pruning are introduced to facilitate the mining process. Our performance study shows that our algorithm not only reduces the number of false positives generated but also improves the mining efficiency, especially in the presence of large frequent free tree patterns in the graph database. © Springer-Verlag Berlin Heidelberg 2007.

关键词： database systems

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Grid-Based Probabilistic Skyline Retrieval on Distributed Uncertain Data 16th

引用

16th international conference on database systems for advanced applications (dasfaa)

作者： Wang, Xiaowei Jia, Yan Natl Univ Def Technol Sch Comp Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783642202445

the skyline queries help users make intelligent decisions over complex data. It has been recently extended to the uncertain databases due to the existence of uncertainty in many real-world data. In this paper, we tackle the problem of probabilistic skyline retrieval on physically distributed uncertain data with low bandwidth consumption. the previous work incurs sharply increased communication cost when the underlying dataset is anti-correlated, which is the typical scenario that the skyline is useful. In this paper, we propose a knowledge sharing approach based on a novel grid-based data summary. By sharing the data summary that captures the global data distribution, each local site is able to identify large amounts of unqualified objects early. Extensive experiments on both efficiency and scalability have demonstrated that our approach outperforms the competitor.

关键词： database systems

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Invariant Event Tracking on Social Networks 20th

引用

20th international conference on database systems for advanced applications (dasfaa)

作者： Unankard, Sayan Li, Xue Long, Guodong Maejo Univ Div Informat Technol Chiang Mai Thailand Univ Queensland Sch ITEE Brisbane Qld Australia Univ Technol Sydney Ctr Quantum Computat & Intelligent Syst Sydney NSW 2007 Australia

ISBN: (纸本)9783319181233;9783319181226

When an event is emerging and actively discussed on social networks, its related issues may change from time to time. People may focus on different issues of an event at different times. An invariant event is an event with changing subsequent issues that last for a period of time. Examples of invariant events include government elections, natural disasters, and breaking news. this paper describes our demonstration system for tracking invariant events over social networks. Our system is able to summarize continuous invariant events and track their developments along a timeline. We propose invariant event detection by utilizing an approach of Clique Percolation Method (CPM) community mining. We also present an approach to event tracking based on the relationships between communities. the Twitter messages related to the 2013 Australian Federal Election are used to demonstrate the effectiveness of our approach. As the first of this kind, our system provides a benchmark for further development of monitoring tools for social events.

关键词： Solvents

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Spatial Keyword Range Search on Trajectories 20th

引用

20th international conference on database systems for advanced applications (dasfaa)

作者： Han, Yuxing Wang, Liping Zhang, Ying Zhang, Wenjie Lin, Xuemin E China Normal Univ Shanghai Key Lab Trustworthy Comp Shanghai 200062 Peoples R China Univ Technol Sydney Sydney NSW 2007 Australia Univ New S Wales Sydney NSW Australia

ISBN: (纸本)9783319181233;9783319181226

With advances in geo-positioning technologies and ensuing location based service, there are a rapid growing amount of trajectories associated with textual information collected in many emerging applications. For instance, nowadays many people are used to sharing interesting experience through Foursquare or Twitter along their travel routes. In this paper, we investigate the problem of spatial keyword range search on trajectories, which is essential to make sense of large amount of trajectory data. To the best of our knowledge, this is the first work to systematically investigate range search over trajectories where three important aspects, i.e., spatio, temporal and textual, are all taken into consideration. Given a query region, a timespan and a set of keywords, we aim to retrieve trajectories that go through this region during query timespan, and contain all the query keywords. To facilitate the range search, a novel index structure called IOC-Tree is proposed based on the inverted indexing and octree techniques to effectively explore the spatio, temporal and textual pruning techniques. Furthermore, this structure can also support the query with order-sensitive keywords. Comprehensive experiments on several real-life datasets are conducted to demonstrate the efficiency.

关键词： Trajectories

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