Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130)最新文献_第8页

The role of ontologies in the verification and validation of knowledge based systems 本体在基于知识的系统的验证和确认中的作用

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707381

Trevor J. M. Bench-Capon

引用次数: 14

An extended query reformulation technique using materialized views 一种使用物化视图的扩展查询重新表述技术

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707517

Jae-young Chang, Sang-goo Lee

引用次数: 2

Extensible multimedia class library for object-oriented database systems 面向对象数据库系统的可扩展多媒体类库

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707511

Takayuki Saeki, M. Namiuchi

引用次数: 0

A software architecture for workflow management systems 工作流管理系统的软件体系结构

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707490

S. Jablonski

引用次数: 11

An information model for nomadic environments 游牧环境的信息模型

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707431

A. Bond, M. Gallagher, J. Indulska

引用次数: 11

Object design of a distributed client/server system 分布式客户机/服务器系统的对象设计

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707521

Sarah Brown, Richard Vallas, Mohamed T. Ibrahim, A. Al-Zobaidie

{"title":"Object design of a distributed client/server system","authors":"Sarah Brown, Richard Vallas, Mohamed T. Ibrahim, A. Al-Zobaidie","doi":"10.1109/DEXA.1998.707521","DOIUrl":"https://doi.org/10.1109/DEXA.1998.707521","url":null,"abstract":"This paper describes our practical experience in developing an object-oriented design and in implementing a prototype distributed client/server application. The system is described in terms of its individual components features and their interaction with other components via middleware. The prototype was coded in Java and employs two middleware technologies for clients/servers interaction. The main middleware employed is CORBA that has enabled us to achieve server location transparency by using CORBA's naming service. CORBA also provides a protocol to allow the communication between the components once binding between them occurred. The second middleware technology used was Java Database Connectivity (JDBC) which provided the means to query and maintain a distributed database. The features of JDBS and the way in which they were applied to the requirements of the application are also described. The prototype application was developed using Visigenic's VisiBroker and the generated classes were then extended using the Java SDK. The JDBC middleware layer was used to provide the link between the Java based servers and the databases. The main contribution of this work is mainly practical and is twofold. Firstly, we describe and share our experience in designing, implementing a prototype application using CORBA/JDBC, as well as our findings relating to performance aspects of the prototype. Secondly, and in the light of the results obtained, we evaluate our approach, lessons learned and suggest possible improvements and guidelines for developing similar systems and/or prototypes.","PeriodicalId":194923,"journal":{"name":"Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116576138","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

Multi-level browsing for efficient image transmission 多级浏览，高效的图像传输

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707427

P. D. Le, B. Srinivasan, S. Kulkarni

{"title":"Multi-level browsing for efficient image transmission","authors":"P. D. Le, B. Srinivasan, S. Kulkarni","doi":"10.1109/DEXA.1998.707427","DOIUrl":"https://doi.org/10.1109/DEXA.1998.707427","url":null,"abstract":"Multimedia applications such as distributed digital libraries, digital databases, teleshopping and telebrowsing systems are expected to deliver as minimum data as needed and allow users to quickly browse through images located in remote databases. Currently users often experience delays since a large amount of multimedia data such as images has to be transmitted across networks. Existing network technologies are not advanced enough (many places still use slow links) and the number of users is growing at a rapid pace. This places a further demand on the network bandwidth. Usually different users and applications may require images at different levels of quality but existing browsers only deliver the available data (often pre-compressed data) and do not allow users to specify the quality level of images they need, hence extra data has to be transmitted unnecessarily. The response time can be improved if the requested images are delivered at the requested quality. This paper proposes a framework for multi-level browsers and network graphic user interfaces based on the notion that the users should be allowed to specify the level of quality of the image they need and suitable compression techniques should be employed to minimise needed image data before transmission. Images can be either precompressed at the desired quality levels or further compressed to reduce their volume before they are delivered.","PeriodicalId":194923,"journal":{"name":"Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131720937","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

Dynamic generation of virtual spaces and incremental query formulation using spatial browsing 利用空间浏览动态生成虚拟空间和增量查询公式

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707520

Kengo Koiso, Kenji Kawakatsu, Katsumi Tanaka, Takehisa Mori

引用次数: 1

Computing conspiracies [data integrity] 计算阴谋[数据完整性]

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707411

P. Elsas, P. Vries, R. V. D. Riet

{"title":"Computing conspiracies [data integrity]","authors":"P. Elsas, P. Vries, R. V. D. Riet","doi":"10.1109/DEXA.1998.707411","DOIUrl":"https://doi.org/10.1109/DEXA.1998.707411","url":null,"abstract":"The concept of 'segregation of duties' is well-known in both organisational and security contexts. For example, the Clark-Wilson model stresses the importance of such a policy appropriate for regulating the involvement of subjects in acting upon business information and business values. However, it gives no guidelines on how to distinguish a proper policy from an improper one. Furthermore, the discipline of auditing has developed numerous schemes for segregation of duties. In this paper we use a model that allows quantification of-and reasoning about-audit-technical segregation of duties. Our approach is based on normative ('Soll') and actual ('Ist') specifications of a company's circular flow of business values in terms of enriched Petri nets. In this type of Petri net the markers represent money, goods, debts and registrations of these business values, the places represent their buffer locations and the transitions represent transformation procedures. Associated to these Petri net elements are agents and their authorisations and abilities. Undetectable use of company assets can now be modelled in the '1st' net by the general Petri net notion of 'T-invariant'. The design of a proper scheme for segregation of duties then reduces to maximisation of the number of agents that need to be minimally involved in order to establish a firing of such a T-invariant.","PeriodicalId":194923,"journal":{"name":"Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131657883","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

Distributed optimization of cyclic queries with parallel semijoins 具有并行半连接的循环查询的分布式优化

Proceedings Ninth International Workshop on Database and Expert Systems Applications (Cat. No.98EX130) Pub Date : 1998-08-26 DOI: 10.1109/DEXA.1998.707487

F. Najjar, Y. Slimani

引用次数: 2