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Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems最新文献

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AQuES: an agent-based query evaluation system AQuES:一个基于代理的查询评估系统
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613817
Michael Stillger, J. K. Obermaier, J. Freytag
{"title":"AQuES: an agent-based query evaluation system","authors":"Michael Stillger, J. K. Obermaier, J. Freytag","doi":"10.1109/COOPIS.1997.613817","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613817","url":null,"abstract":"Optimization for distributed and parallel database systems is an overly complex problem. This complexity arises due to the various kinds of parallelism and the coexistence of heterogeneous hardware modules. The query optimizers for those systems must exploit parallel algorithms for algebra operators, independent data parallelism and resource scheduling. In addition, unexpected deviations of the workload at runtime enforce new, dynamic execution strategies. This paper reports ongoing work in developing an agent-based query optimization and execution system to cope with this problem. It is based on the principles of distributed, symmetric processes which work in a cooperative, yet independent manner. This approach enables a dynamical adaptation to changes in the execution environment with local and simple actions. We present the architecture of the components and outline the principle of distributed query execution within this software system.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134372241","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
Cooperative view mechanisms in distributed multiuser hypermedia environments 分布式多用户超媒体环境中的协同视图机制
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613798
S. Konomi, Yusuke Yokota, Kazuhiro Sakata, Y. Kambayashi
{"title":"Cooperative view mechanisms in distributed multiuser hypermedia environments","authors":"S. Konomi, Yusuke Yokota, Kazuhiro Sakata, Y. Kambayashi","doi":"10.1109/COOPIS.1997.613798","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613798","url":null,"abstract":"Distributed multi-user hypermedia environments provide not only information-sharing mechanisms but also user collaboration/communication facilities. The provision of integrated views of heterogeneous information resources is necessary to create a common understanding among the users, who are possibly distributed in terms of geography and time. However, the requirements of customization must also be considered, since such diverse users would want to personalize their views of shared information. In order to integrate these views while considering the requirements of flexible customization, we propose cooperative view mechanisms of Dexter-based hypermedia systems, introducing environmental objects and their participation relationships. The mechanisms instantiate hypermedia deputies on the screen using participation relationships of the users, hypermedia components and environments. The relationships are also used for the purpose of supporting awareness. Using a novel user collaboration facility, the relationships are visualized so that users can easily recognize other users and/or user groups having the same, slightly different or very different views. Attributes of environment objects are discussed so that the mechanisms can be effectively utilized in computer-supported cooperative work settings such as distance presentations, virtual offices and virtual classrooms.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123853084","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
Fault-tolerant and approximate reasoning in multi-source environments 多源环境下的容错和近似推理
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613803
F. Koriche
{"title":"Fault-tolerant and approximate reasoning in multi-source environments","authors":"F. Koriche","doi":"10.1109/COOPIS.1997.613803","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613803","url":null,"abstract":"When different knowledge-based systems must cooperate to perform decision tasks that are beyond their individual capabilities, we are faced with the problem of combining knowledge in a multi-source environment. In particular, we are confronted with two main difficulties: the prospect of inconsistency, which arises when different knowledge bases are merged together, and the high computational complexity of reasoning with very large pools of combined information. In this paper, we define a formal framework which handles both aspects of consistency and tractability, and which is useful to specify knowledge retrievers. This framework tolerates inconsistency and enables a knowledge retriever to infer non-degenerative conclusions when conflicting viewpoints are combined. Furthermore, approximate reasoning is incorporated in order to perform efficient query answering using combined knowledge. Finally, a stepwise procedure is included for improving approximate answers and allowing their convergence to the right answer.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125076040","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
Electronic circulation of copyrighted information in CSCW environments 版权信息在CSCW环境下的电子流通
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613824
A. Wadaa, S. Shen, M. Eltoweissy
{"title":"Electronic circulation of copyrighted information in CSCW environments","authors":"A. Wadaa, S. Shen, M. Eltoweissy","doi":"10.1109/COOPIS.1997.613824","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613824","url":null,"abstract":"Summary form only given. Computing and communications technologies have revolutionized the methods for creation, reproduction, and dissemination of copyrighted multimedia information. The demand on this electronic information increases rapidly as developers and users migrate to computer supported cooperative work, or CSCW, environments. Central to CSCW environments is information sharing both at the intra- as well as the inter-group levels. The electronic circulation of copyrighted information among group members poses numerous problems. We can identify a set of requirements for the electronic circulation of copyrighted objects in CSCW environments. We present a novel approach to satisfy these requirements. Our approach is to commercialize autonomous inter-entity sharing in order to discourage unauthorized reproduction activities and promote autonomous sharing of copyrighted information in group activities.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133441083","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
Accessing heterogeneous data through homogenization and integration mediators 通过同质化和集成中介访问异构数据
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613810
Lingling Yan, M. Tamer Özsu, Ling Liu
{"title":"Accessing heterogeneous data through homogenization and integration mediators","authors":"Lingling Yan, M. Tamer Özsu, Ling Liu","doi":"10.1109/COOPIS.1997.613810","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613810","url":null,"abstract":"The AURORA mediator system employs a novel 2-tier, plug-and-play mediation model that is designed to facilitate access to a large number of heterogeneous data sources. The paper describes AURORA's mediation model and a suite of techniques used by a specific AURORA mediator, AURORA-RH. This suite includes a mediation methodology provided via an interactive mediator author's toolkit (MAT), a mediation enabling algebra, a query rewriting algorithm, and transformation rules that facilitate query optimization.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129105574","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
Poster on accept heterogeneity: an event monitoring service for CORBA-based heterogeneous information systems 基于corba的异构信息系统的事件监控服务
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613823
Günter von Bültzingsloewen, Arne Koschel, Ralf Kramer
{"title":"Poster on accept heterogeneity: an event monitoring service for CORBA-based heterogeneous information systems","authors":"Günter von Bültzingsloewen, Arne Koschel, Ralf Kramer","doi":"10.1109/COOPIS.1997.613823","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613823","url":null,"abstract":"Summary form only given. Today's distributed information systems often are collections of existing information sources and as such heterogeneous. Technical integration of heterogeneous sources is supported by CORBA. However, CORBA provides very general support and does not take source specific semantics into account. This also applies to CORBA's Event Service. Our objective is to enhance CORBA by mechanisms that allow to add application semantics. Our key idea is to provide a flexible configurable event monitoring service, which accepts heterogeneity, for a CORBA environment. Configurable means that we are able to generate code templates at compile time and to provide dynamic parametrization of parts of the service. Event passing semantics follow those developed for active database Event-Condition-Action (ECA) rules.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124587364","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
Federating object-oriented and relational databases: the IRO-DB experience 联合面向对象和关系数据库:IRO-DB体验
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613797
G. Gardarin, Béatrice Finance, Péter Fankhauser
{"title":"Federating object-oriented and relational databases: the IRO-DB experience","authors":"G. Gardarin, Béatrice Finance, Péter Fankhauser","doi":"10.1109/COOPIS.1997.613797","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613797","url":null,"abstract":"From the beginning of 1994 to the end of 1996, the IRO-DB (Interoperable Relational and Object-Oriented Databases) ESPRIT project has developed tools for accessing relational and object-oriented databases in an integrated way, and for designing and maintaining integrated applications on large federations of heterogeneous databases. IRO-DB is based on the ODMG pivotal object model and gives an OQL/OML-C++ interface to users on a federation of relational and object-oriented databases. This paper summarizes the main problems and choices done during the system design, describes the IRO-DB architecture and components, presents the project's achievements and gives a synthesis of the lessons learned during the project's development. It also introduces future plans for the system.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114402736","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
Semi-automatic wrapper generation for Internet information sources 因特网信息源的半自动包装器生成
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613813
N. Ashish, Craig A. Knoblock
{"title":"Semi-automatic wrapper generation for Internet information sources","authors":"N. Ashish, Craig A. Knoblock","doi":"10.1109/COOPIS.1997.613813","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613813","url":null,"abstract":"To simplify the task of obtaining information from the vast number of information sources that are available on the World Wide Web (WWW), the authors are building information mediators for extracting and integrating data from multiple Web sources. In a mediator based approach, wrappers are built around individual information sources to translate between the mediator query language and the individual sources. They present an approach for semi-automatically generating wrappers for structured Internet sources. The key idea is to exploit formatting information in Web pages to hypothesize the underlying structure of a page. From this structure the system generates a wrapper that facilitates querying of a source and possibly integrating it with other sources. They demonstrate the ease with which they are able to build wrappers for a number of Web sources using their implemented wrapper generation toolkit.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"6 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116864565","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: 209
Poster on transparent access to a network of information sources and service providers via a universal relation interface 通过通用关系接口透明访问信息源和服务提供者网络的海报
Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems Pub Date : 1997-06-24 DOI: 10.1109/COOPIS.1997.613821
Christine Reck
{"title":"Poster on transparent access to a network of information sources and service providers via a universal relation interface","authors":"Christine Reck","doi":"10.1109/COOPIS.1997.613821","DOIUrl":"https://doi.org/10.1109/COOPIS.1997.613821","url":null,"abstract":"Summary form only given. We propose the use of the universal relation as a user interface to provide transparent access to a network of distributed, heterogeneous, and autonomous information sources. We implement this interface in two layers. The lower layer consists of access scripts, which encapsulate knowledge about information sources and are capable of answering basic queries. The upper layer uses combinations of these scripts to answer user queries phrased in terms of a universal relation. In this paper we address the problem of defining the semantics of a user query posed against the universal relation and of finding a sequence of access script invocations that gathers the information requested in the query.","PeriodicalId":293694,"journal":{"name":"Proceedings of CoopIS 97: 2nd IFCIS Conference on Cooperative Information Systems","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128568796","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
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