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Selection of Redundant and non Redundant Optimization Structures in VLDBs vldb中冗余与非冗余优化结构的选择
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.133
Ladjel Bellatreche
{"title":"Selection of Redundant and non Redundant Optimization Structures in VLDBs","authors":"Ladjel Bellatreche","doi":"10.1109/DEXA.2007.133","DOIUrl":"https://doi.org/10.1109/DEXA.2007.133","url":null,"abstract":"Very large database applications are usually modelled using huge schemas with several large tables with many columns. Queries defined on those schemas are complex since they contain join and aggregation operations. In large databases, join operations are the most used and the most expensive, especially when the size of tables is very large. To optimize these complex queries, several optimization structures have been proposed. Selecting any optimization structure is NP-hard problems since their search spaces are very large. In this paper, we classify these structures into two main categories: (1) non redundant structures (horizontal and vertical partitioning, parallel processing) and (2) redundant structures (materialized views, indexing schemes). Our study focuses on two non redundant structures: horizontal and vertical partitioning and one redundant structure: bitmap join indexes, where formalizations of their selection problems and algorithms are presented. We propose an approach combining horizontal partitioning and bitmap join indexes to speed up queries and to reduce storage and maintenance costs of indexes. Finally, our proposed algorithms are validated using experimental studies.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128892584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Context-Awareness of Content Delivery Service Based on Location Estimate with an Active RFID system 基于位置估计的有源RFID系统内容交付服务的上下文感知
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.153
T. Yamashita, D. Takaoka, Noriaki Izumi, A. Sashima, K. Kurumatani, K. Hasida
{"title":"Context-Awareness of Content Delivery Service Based on Location Estimate with an Active RFID system","authors":"T. Yamashita, D. Takaoka, Noriaki Izumi, A. Sashima, K. Kurumatani, K. Hasida","doi":"10.1109/DEXA.2007.153","DOIUrl":"https://doi.org/10.1109/DEXA.2007.153","url":null,"abstract":"In this paper, to tackle with uncertainty in the real world, the light-weight ontology drive approach is proposed for the realization of context dependent services. We concentrate on position information and an operation history, as a user's context, and develop our location-aware content delivery system. The evaluation experiment of our location estimate engine is performed in Akihabara software showcase at Information Technology Research Institute. Furthermore, through the proofing experiment in Expo 2005 Aichi, our proposed architecture is confirmed to enables us to realize the real world application of context dependency. Finally, we compare our location-aware content delivery system and related researches, and discuss the advantage of our system.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122106026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Subtree Testing and Closed Tree Mining Through Natural Representations 基于自然表示的子树测试和闭树挖掘
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.73
J. Balcázar, A. Bifet, A. Lozano
{"title":"Subtree Testing and Closed Tree Mining Through Natural Representations","authors":"J. Balcázar, A. Bifet, A. Lozano","doi":"10.1109/DEXA.2007.73","DOIUrl":"https://doi.org/10.1109/DEXA.2007.73","url":null,"abstract":"Several classical schemes exist to represent trees as strings over a fixed alphabet; these are useful in many algorithmic and conceptual studies. Our previous work has proposed a representation of unranked trees as strings over a countable alphabet, and has shown how this representation is useful for canonizing unordered trees and for mining closed frequent trees, whether ordered or unordered. Here we propose a similar, simpler alternative and adapt some basic algorithmics to it; then we show empirical evidence of the usefulness of this representation for mining frequent closed unordered trees on real-life data.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"622 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123044600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
KoMIS: An Ontology-Based Knowledge Management System for Industrial Safety 基于本体的工业安全知识管理系统
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.34
A. A. Assali, D. Lenne, B. Debray
{"title":"KoMIS: An Ontology-Based Knowledge Management System for Industrial Safety","authors":"A. A. Assali, D. Lenne, B. Debray","doi":"10.1109/DEXA.2007.34","DOIUrl":"https://doi.org/10.1109/DEXA.2007.34","url":null,"abstract":"This paper presents an ontology-based knowledge management system for indexing and retrieving information about a domain-specific corpus of resources in an industrial enterprise. From our ongoing project KoMIS (knowledge management for industrial safety), we introduce in this paper our approach to index the internal resources of an enterprise using two ontologies; a domain ontology that describes the terms of the studied domain (the industrial safety domain), and an application ontology that describes the various types of indexed resources. In our indexing approach, the resulting index is an RDF file that can be interrogated using one of the RDF query languages. An ontology-based information retrieval system is built as a Web application to help and guide users in their research for resources. Thanks to our indexing and retrieval model, the returned Web page of results is built dynamically so that each potential modification of the application ontology will be taken into account without affecting the internal structure of the information retrieval system.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123326458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Information extraction based on personalization and contextualization models for multimodal data 基于个性化和上下文化模型的多模态数据信息提取
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.95
M. Caschera, Arianna D’ulizia
{"title":"Information extraction based on personalization and contextualization models for multimodal data","authors":"M. Caschera, Arianna D’ulizia","doi":"10.1109/DEXA.2007.95","DOIUrl":"https://doi.org/10.1109/DEXA.2007.95","url":null,"abstract":"Multimedia data concern visual, audio, textual, information involving voice, gestures and others, so there are several challenges related to their storage and retrieval. Context awareness and personalization are key aspects to consider to manage any information-related content. In this paper we propose a general profiling model to define the user and context profiles in order to preserve and use their interrelationships. This general profiling model can be used to filter the user query in a more precise and selective way and to filter the multimedia contents in the repository that match the user query. In this paper the personalization relies on the combined use of the user profiles and context profiles, and the combination driving in particular the choice of the interaction mode in order to make relevant information available to people in the appropriate form.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124467206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Situated Multimodal Documents 定位多式联运单据
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.87
A. Celentano, Fabio Pittarello
{"title":"Situated Multimodal Documents","authors":"A. Celentano, Fabio Pittarello","doi":"10.1109/DEXA.2007.87","DOIUrl":"https://doi.org/10.1109/DEXA.2007.87","url":null,"abstract":"The choices made by user in processing a set of documents is related, in a broad sense, to the sum of influences coming from the documents in the user situation, which does not include only physical or technical context parameters, but also the user goal and a set of personal components related to the user goal and to the effect on the user of the document. We use the term situated document to denote such influence. In this paper we propose a model for situated documents and propose a functional architecture for their management.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124513620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Mining Multidimensional Data Using Clustering Techniques 利用聚类技术挖掘多维数据
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.112
M. Pagani, Gloria Bordogna, M. Valle
{"title":"Mining Multidimensional Data Using Clustering Techniques","authors":"M. Pagani, Gloria Bordogna, M. Valle","doi":"10.1109/DEXA.2007.112","DOIUrl":"https://doi.org/10.1109/DEXA.2007.112","url":null,"abstract":"We describe a novel data mining procedure to discover relevant associations in multidimensional data. The procedure applies hierarchical clustering to distinct pattern sets(views) of the same dataset and identifies the best partitions in the two dendrograms that exhibit the greatest correlation.Finally the most relevant associations between pattern sets characterizing the most correlated clusters in the identified partitions are discovered. An application of the procedure to identify association between compositional views and performance views of a dataset of materials is discussed.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121905528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Hyperlink Classification: A New Approach to Improve PageRank 超链接分类:提高PageRank的新方法
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.14
Li Cun-he, Lv Ke-qiang
{"title":"Hyperlink Classification: A New Approach to Improve PageRank","authors":"Li Cun-he, Lv Ke-qiang","doi":"10.1109/DEXA.2007.14","DOIUrl":"https://doi.org/10.1109/DEXA.2007.14","url":null,"abstract":"Hyperlink structure is widely used in the hypertext classification, but it has not been paid enough attention. We propose a hyperlink classification approach to improve PageRank algorithm which is widely used in the link analysis of search engine. The cause of the topic drift problem is analyzed and the hyperlinks are classified according to their creating motivations and effects. The improved PageRank algorithm is implemented on the open source search engine NUTCH in Chinese Internet. The experimental results show that the improved PageRank algorithm performs better than the standard PageRank.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122571723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Query Answering in Relational Inductive Databases 关系归纳数据库中的查询应答
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.61
Kittisak Kerdprasop, Nittaya Kerdprasop, Apichai Ritthongchailert
{"title":"Query Answering in Relational Inductive Databases","authors":"Kittisak Kerdprasop, Nittaya Kerdprasop, Apichai Ritthongchailert","doi":"10.1109/DEXA.2007.61","DOIUrl":"https://doi.org/10.1109/DEXA.2007.61","url":null,"abstract":"Inductive databases can be viewed as a natural extension of traditional databases to contain not only persistent data but also the generalization of stored data, which are called patterns. The idea of inductive databases has been proposed originally as a support system for the knowledge discovery or data mining process. Many SQL-like languages have been designed and implemented to include mining operators in the SQL primitives. We percept the concept of inductive databases in a different angle. In stead of designing yet another inductive database system, we are looking for the deployment of an existing inductive query language and environment to support the database tasks. We focus on the task of query answering which has a high potential of being a beneficiary of the stored patterns in inductive databases. Our experimental results of query rewriting technique using induced patterns as a semantic knowledge confirm this advantage.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125521686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Automatic Decision Making in SHM Using Hidden Markov Models 基于隐马尔可夫模型的SHM自动决策
18th International Workshop on Database and Expert Systems Applications (DEXA 2007) Pub Date : 2007-09-03 DOI: 10.1109/DEXA.2007.138
Constanze Tschöpe, M. Wolff
{"title":"Automatic Decision Making in SHM Using Hidden Markov Models","authors":"Constanze Tschöpe, M. Wolff","doi":"10.1109/DEXA.2007.138","DOIUrl":"https://doi.org/10.1109/DEXA.2007.138","url":null,"abstract":"Decision making and classification methods are very important in the field of structural health monitoring and life cycle prediction. We want to introduce an approach basing on sequence classifiers which can be used to several applications without any explicit knowledge of structures. To illustrate the concept we explain the method by means of a special example. So we can demonstrate our approach detailed, but although not too abstract.","PeriodicalId":314834,"journal":{"name":"18th International Workshop on Database and Expert Systems Applications (DEXA 2007)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117316514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
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