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Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99最新文献

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A relational algebra for user-defined periodicity 用于用户定义周期性的关系代数
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795233
P. Terenziani
{"title":"A relational algebra for user-defined periodicity","authors":"P. Terenziani","doi":"10.1109/DEXA.1999.795233","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795233","url":null,"abstract":"Calendars and periodicity play a fundamental role in many applications. Recently, some commercial databases started to support user-defined periodicity in the queries, providing high level languages to this purpose (e.g., TimeSeries in Oracle 8). On the other hand, existing relational data models do not support user-defined periodicity in the data, with few exceptions. We sketch a high level \"symbolic\" language for representing periodicity in a \"human oriented\" way, and propose a temporal relational model which supports user-defined \"symbolic\" periodicity in the validity time of tuples. We also define the temporal counterpart of the standard operators of the relational algebra, and introduce new temporal operators and functions. Finally, we sketch a symbolic implementation of the algebraic operators.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115118725","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: 2
WEDAGEN-a synthetic Web database generator wedagen——一个合成的Web数据库生成器
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795277
P. Priyadarshini, Fengqiong Qin, Ee-Peng Lim, W. Ng
{"title":"WEDAGEN-a synthetic Web database generator","authors":"P. Priyadarshini, Fengqiong Qin, Ee-Peng Lim, W. Ng","doi":"10.1109/DEXA.1999.795277","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795277","url":null,"abstract":"At the Centre for Advanced Information Systems (CAIS), a Web warehousing system is being developed to store and manipulate Web information. The system named WHOWEDA (WareHouse Of WEb DAta) stores extracted Web information as Web tables and provides several Web operators, eg. Web join, Web select, global coupling, etc., to manipulate Web tables. During the implementation of WHOWEDA, it is necessary to perform systematic testing on the system and to evaluate its system performance. While it is possible for WHOWEDA to be tested or evaluated using actual Web pages downloaded from WWW, the amount of time required for such testing and evaluation would be so high that a comprehensive experimentation would not be possible. To overcome these difficulties, we have proposed to develop a synthetic Web database generator called WEDAGEN to efficiently generate synthetic Web information for performance evaluation and testing purposes. We present the major objectives to be accomplished by the proposed synthetic Web database generator.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115377862","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
Geo Viser. Geographic visualization of search engine results Geo遮光板。搜索引擎结果的地理可视化
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795177
Jayesh Govindarajan, M. Ward
{"title":"Geo Viser. Geographic visualization of search engine results","authors":"Jayesh Govindarajan, M. Ward","doi":"10.1109/DEXA.1999.795177","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795177","url":null,"abstract":"Successful navigation of the web for relevant information is facilitated by keyword and subject based search tools. To the best of our knowledge, most tools which achieve this goal are not designed to find the geographic location of information sources. In many instances such information could prove to be extremely useful to answer queries with certain geo-spatial elements. The main contribution of this paper is the idea of discovering the geographic location of webpages obtained via a search engine query and visualizing the results by placing them on a map in an attempt to convey spatial attributes such as location and distance. Current search engines ignore the existence of such geographic meta-data and therefore are unable to process queries which are inherently geo-spatial in nature. Our system (Geo Viser) integrates this functionality to supplement the current capabilities of a search engine.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125146216","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: 8
Interoperability of event service in Java ORB environment Java ORB环境中事件服务的互操作性
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795140
Gil-Seong Na, Sang Ho Lee
{"title":"Interoperability of event service in Java ORB environment","authors":"Gil-Seong Na, Sang Ho Lee","doi":"10.1109/DEXA.1999.795140","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795140","url":null,"abstract":"The paper begins with consideration on push technology in Java ORB environment, and investigates interoperability of event channels of the event service of CORBA, which should be technically addressed to build a true push service in a Java ORB environment. We present three different methods that enable one event channel to be connected with other event channels. Pros and cons of each method are described. All mentioned approaches have been implemented in Java. An experimental performance evaluation has been carried out and evaluation results are also given.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125565019","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
A metaphor graphics based representation of digital libraries on the World Wide Web: using the libViewer to make metadata visible 万维网上数字图书馆的隐喻图形表示:使用libViewer使元数据可见
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795181
A. Rauber, Harald Bina
{"title":"A metaphor graphics based representation of digital libraries on the World Wide Web: using the libViewer to make metadata visible","authors":"A. Rauber, Harald Bina","doi":"10.1109/DEXA.1999.795181","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795181","url":null,"abstract":"While methods for searching large digital libraries have experienced tremendous improvements recently, interfaces to such collections still have a far way to go. Most interfaces to digital libraries present themselves as various forms of sorted lists, providing metadata information on the documents in textual form. This prohibits intuitive understanding of document archives or Web search results. We present the libViewer, a Java-based user interface to digital libraries using metaphor graphics to display information on the elements in a digital library in an intuitively understandable way. Metadata on digital libraries based on the Dublin Core Initiative is mapped onto a set of metaphors to allow instant recognition and orientation in an unknown document collection, facilitating interactive retrieval and exploration.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114381622","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: 24
Visualization of WWW-search results www -搜索结果的可视化
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795176
T. M. Mann
{"title":"Visualization of WWW-search results","authors":"T. M. Mann","doi":"10.1109/DEXA.1999.795176","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795176","url":null,"abstract":"The idea of Information Visualization is to get insights into great amounts of abstract data. Especially document sets found by searching the World Wide Web are a special challenge. The paper gives a short overview on the variety of possible visualizations for this application area. The presented ideas are grouped by using the four phase framework of information seeking. Crucial factors for the success of visualizations are discussed. An approach is presented to use alternative simple visualizations grouped around the traditional result-list, for the usage with a local meta web search engine.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116820045","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: 53
Reusing scenario based approaches in requirement engineering methods: CREWS method base 在需求工程方法中重用基于场景的方法:CREWS方法基础
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795184
J. Ralyté
{"title":"Reusing scenario based approaches in requirement engineering methods: CREWS method base","authors":"J. Ralyté","doi":"10.1109/DEXA.1999.795184","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795184","url":null,"abstract":"Scenarios have proven useful to elicit, validate and document requirements but the development of new methods find tools for requirements engineering integrating scenario based approaches has been limited. The view developed in this paper is that scenario based approaches should be looked upon as reusable components. Our concern is therefore twofold: first, to represent scenario based approaches in a modular way which eases their reusability and second, to specify the design context in which these approaches can be reused in order to facilitate their integration in existing methods. The paper presents also an implementation of our proposal using SGML-HTML to store scenario based approaches in the multimedia hypertext documents and illustrates the retrieval of components meeting the requirements of the user by means of SGMLQL queries.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128504816","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: 66
SIM-a system for semi-automatic indexing of multilingual documents sim -多语言文档的半自动索引系统
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795249
U. Schiel, Ianna M. S. F. de Sousa, Edberto Ferneda
{"title":"SIM-a system for semi-automatic indexing of multilingual documents","authors":"U. Schiel, Ianna M. S. F. de Sousa, Edberto Ferneda","doi":"10.1109/DEXA.1999.795249","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795249","url":null,"abstract":"With the growing significance of digital libraries and the Internet, more and more electronic texts become accessible to a wide and geographically disperse public. This requires adequate tools to facilitate indexing, storage, and retrieval of documents written in different languages. We present a method for semi-automatic indexing of electronic documents and construction of a multilingual thesaurus, which can be used for query formulation and information retrieval. We use special dictionaries and user interaction in order to solve ambiguities and find adequate canonical terms in the language and an adequate abstract language-independent term. The abstract thesaurus is updated incrementally by new indexed documents and is used to search documents concerning terms in a query to the document base.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128593854","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: 4
An XML-based, 3-tier scheme for integrating heterogeneous information sources to the WWW 一种基于xml的三层方案，用于将异构信息源集成到WWW
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795270
Costas Petrou, S. Hadjiefthymiades, D. Martakos
{"title":"An XML-based, 3-tier scheme for integrating heterogeneous information sources to the WWW","authors":"Costas Petrou, S. Hadjiefthymiades, D. Martakos","doi":"10.1109/DEXA.1999.795270","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795270","url":null,"abstract":"The phenomenal growth that the WWW currently experiences necessitates the integration of various types of information sources to its platform. We present an open, extensible multi-agent architecture, which is based on standards like XML, for the efficient retrieval of information from RDBMSs and HTML document collections. We also specify a series of protocols for achieving the synergy between a number of server- and client-side components.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123891639","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: 15
A lineage metadata model for the temporal management of a cadastre application 用于地籍应用程序临时管理的沿袭元数据模型
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795211
Laurent Spéry, Christophe Claramunt, T. Libourel
{"title":"A lineage metadata model for the temporal management of a cadastre application","authors":"Laurent Spéry, Christophe Claramunt, T. Libourel","doi":"10.1109/DEXA.1999.795211","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795211","url":null,"abstract":"Nowadays one of the most successful applications of GIS is the management of a land-use cadastre. A lot of corporate GIS databases are in development, they support the legal management and distribution of cadastral maps. However, the management of the propagation of geographical updates toward relevant user databases is still a methodological and technical problem to address in the context of a corporate application. This paper proposes a lineage metadata model that supports the management of geographical changes in the context of a corporate cadastre application. Geographical changes are identified from an analysis of the French cadastre which acts as a case study for the development of our model. The lineage metadata model is based on the application of a filiation tree that permits the management of the evolution of geographical objects and the generation of historical queries. The proposed model is specified and validated with the O/sub 2/ object-oriented database.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121446226","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: 37
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