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

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Client-server architecture for accessing multimedia and geographic databases within embedded systems 用于在嵌入式系统中访问多媒体和地理数据库的客户机-服务器体系结构
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795280
A. Bouju, A. Stockus, F. Bertrand, P. Boursier
{"title":"Client-server architecture for accessing multimedia and geographic databases within embedded systems","authors":"A. Bouju, A. Stockus, F. Bertrand, P. Boursier","doi":"10.1109/DEXA.1999.795280","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795280","url":null,"abstract":"We present a software architecture that is dedicated to the development of an information system embedded in a vehicle allowing access to multimedia and geographic databases. This system provides some functionality of a navigation system and uses a Global Positioning System for recognizing the position of the vehicle. The client-server architecture allows communication between the components of the system, as well as access to various information sources. Communications are based on the use of a cellular phone and Internet connection. Web browser and Java applets are used for information presentation and processing. The combined use of embedded local server and distant servers is one of the main characteristics of the system.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"47 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":"117311910","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
Roam: a scalable replication system for mobile computing 漫游:用于移动计算的可扩展复制系统
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795151
David Ratner, P. Reiher, G. Popek
{"title":"Roam: a scalable replication system for mobile computing","authors":"David Ratner, P. Reiher, G. Popek","doi":"10.1109/DEXA.1999.795151","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795151","url":null,"abstract":"Nomadic users require replication to store copies of critical data on their mobile machines while disconnected or poorly connected. Existing replication services do not provide all classes of mobile users with the capabilities they require, which include: the ability for direct synchronization between any two replicas, support for large numbers of replicas, and detailed control over what files reside on their local (mobile) replica. Mobile users must adapt their behavior to match the level of service provided by today's replication systems, thereby hindering mobility and costing additional time, money, and systems management. Roam is a replication system designed to satisfy the requirements of the mobile user. Roam is based on the Ward Model, a replication architecture for mobile environments. Using the Ward Model and new distributed algorithms, Roam provides a scalable replication solution for the mobile user. We describe the motivation, design, and implementation of Roam and report its performance.","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":"115204255","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: 52
Coordination of security levels for Internet architectures Internet架构的安全级别协调
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795291
E. Fernández
{"title":"Coordination of security levels for Internet architectures","authors":"E. Fernández","doi":"10.1109/DEXA.1999.795291","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795291","url":null,"abstract":"Internet systems provide a variety of ways for exchanging information, contain a large amount and variety of data, and have become quite complex, making them vulnerable to attacks from determined hackers. There are many products currently being used to stop these attacks but they suffer from a lack of completeness, only applying to one type of attack. Several mechanisms are needed for a comprehensive defense but this incurs the problem of their lack of coordination, which can be exploited for attacks. We propose a way to coordinate different mechanisms based on a unified object-oriented modeling approach and a hierarchical architecture whose layers define the scope of each security mechanism.","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":"115452934","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: 20
Conflict resolution and reconciliation in disconnected databases 在断开连接的数据库中解决冲突和协调
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795148
Shirish Hemant, Phatak B R Badrinath
{"title":"Conflict resolution and reconciliation in disconnected databases","authors":"Shirish Hemant, Phatak B R Badrinath","doi":"10.1109/DEXA.1999.795148","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795148","url":null,"abstract":"As mobile computing devices become more and more popular, mobile databases have started gaining popularity. An important feature of these database systems is their ability to allow optimistic replication of data by providing disconnected mobile devices with the ability to perform local updates. The key problem to this approach is the reconciliation problem, i.e. the problem of serializing potentially conflicting updates from disconnected clients on all replicas of the database. Reconciliation of conflicting updates is a fundamental problem for mobile databases where disconnected updates are allowed. We examine some choices for providing solutions to the reconciliation problem. We also describe a simple but illustrative sample application. Finally we present our conclusions.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"77 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":"132355238","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: 29
The challenges of requirements engineering in mobile telephones industry 移动电话行业需求工程的挑战
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795189
A. Maccari
{"title":"The challenges of requirements engineering in mobile telephones industry","authors":"A. Maccari","doi":"10.1109/DEXA.1999.795189","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795189","url":null,"abstract":"Requirements engineering ranks as one of the most difficult and error-prone phases in the life cycle of devices such as mobile telephones. It is of critical importance because of the highly dynamic market and the constant evolution of product features. If carried out properly, it shortens development time and allows to build products that respond to the market needs. However, it is too often regarded as useless and overly time-consuming. An outlook on the state of practice allows to identify space for improvement of the requirements engineering process (REP). I propose three main challenges that stand on the way towards an optimal requirements engineering practice in our sector. A higher degree of co-operation between the industry and the research world is essential in order to achieve success in this informal yet critical phase of product development.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"72 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":"130873923","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: 14
CHOROCHRONOS: research on spatiotemporal database systems 时空数据库系统的研究
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795207
T. Sellis
{"title":"CHOROCHRONOS: research on spatiotemporal database systems","authors":"T. Sellis","doi":"10.1109/DEXA.1999.795207","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795207","url":null,"abstract":"Spatiotemporal database management systems can become an enabling technology for important applications such as geographic information systems (GIS), environmental information systems, and multimedia. We address research issues in spatiotemporal databases, by providing an analysis of the challenges set, the problems encountered, as well as the proposed solutions and the envisioned research areas open to investigation in the EU funded project CHOROCHRONOS.","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":"130880467","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: 13
Supporting a co-operative requirements engineering process 支持合作需求工程过程
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795190
I. Alexander
{"title":"Supporting a co-operative requirements engineering process","authors":"I. Alexander","doi":"10.1109/DEXA.1999.795190","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795190","url":null,"abstract":"Experiences with a tool (Scenario Plus) which attempts to support a co-operative requirements engineering process are described. The tool creates, edits, and measures agent interaction models, goal models serving as requirements frameworks, sets of scenarios, and sets of test scripts. Each product is valuable in itself and also helps to generate the next product. Both object-oriented and structured design can follow.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"18 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":"125360730","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
DOCPROS: a knowledge-based personal document management system DOCPROS:一个基于知识的个人文档管理系统
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795240
Xien Fan, Fang Sheng, P. Ng
{"title":"DOCPROS: a knowledge-based personal document management system","authors":"Xien Fan, Fang Sheng, P. Ng","doi":"10.1109/DEXA.1999.795240","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795240","url":null,"abstract":"DOCPROS is a knowledge-based system for managing personal documents. A dual-model is used to combine document representation and organization. This flexible and dynamic model allows users to specify how the documents should be interpreted, classified and organized. With the help of an adaptive knowledge base, the system understands the user's requirements and manages the documents the same way as the user expects. Document filing and retrieval are knowledge-based and predicate-driven. Document and information retrieval is very effective and efficient since the user knows how the documents are managed.","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":"114821699","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: 7
A statistical refinement method for word shape token querying of document images 文档图像词形令牌查询的统计改进方法
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795248
Jerh. O'Connor, A. Smeaton
{"title":"A statistical refinement method for word shape token querying of document images","authors":"Jerh. O'Connor, A. Smeaton","doi":"10.1109/DEXA.1999.795248","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795248","url":null,"abstract":"Word Shape Tokens (WSTs) are tokens used to represent words based on the overall shape or contour of a word as it appears in printed text. A character shape code (CSC) mapping function is used to aggregate similarly shaped letters such as \"g\" and \"y\" into one single code to represent those letters. The rationale behind this is that it is far easier and more accurate to map a scanned image of a word or letter into its WST representation than it is to map into its full ASCII representation. In previous work we showed that user-mediated selection of WSTs for querying document images improved system performance. In the work reported here we use a statistically derived dataset to help determine whether or not a particular WST from a scanned document image actually matches a query term WST. We do this by comparing the preceding and following WSTs of the each WST in a document against previously collected frequency data for a large set of WST occurrences.","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":"124326715","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: 0
Modeling and querying structure and contents of the Web 建模和查询Web的结构和内容
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795273
Wolfgang May
{"title":"Modeling and querying structure and contents of the Web","authors":"Wolfgang May","doi":"10.1109/DEXA.1999.795273","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795273","url":null,"abstract":"For accessing and processing the information provided on the Web, there is a need for extraction, restructuring, and integration of semistructured data from autonomous, heterogeneous sources. We regard the Web and its contents as a unit, represented in an object-oriented data model: the Web structure (inter-document level), given by its hyperlinks, the parse-trees of Web pages (intra-document level), and their contents. The model is complemented by a rule-based object-oriented language which is extended by Web access capabilities and allows for navigation in the unified model. We show the practicability of our approach by using the FLORID system.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"68 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":"121454441","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: 11
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