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检索条件"主题词=object-oriented databases"

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A revised implicit locking scheme in object-oriented database systems 8th

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8th International Conference on High Performance Computing and Networking, HPCNEurope 2000

作者： Jun, Woochun Kim, Kapsu Dept. of Computer Education Seoul National University of Education Seoul Korea Republic of

ISBN: (纸本)9783540675532

In this paper, we present a locking-based concurrency control scheme for object-oriented databases (OODBs). Our scheme revises the implicit locking so that incurs less locking overhead than implicit locking for any types of access to OODBs. Especially, our scheme only uses structural information of OODBs so that extra overhead to reduce locking overhead is little. In this work, we prove that our scheme performs better than the implicit locking. © Springer-Verlag Berlin Heidelberg 2000.

关键词： object-oriented databases

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Customer context Server™ application enabling customer-focused e-commerce

Customer context Server™ application enabling customer-focu...

引用

2000 Conference on object-oriented Programming, Systems, Languages, and Applications, OOPSLA 2000

作者： Barabas, Bert Van Gulik, Mark Microsoft Corporation United States

ISBN: (纸本)1581133073

Fragmentation of customer data across internal product based systems is preventing a meaningful customer dialog across channels. This problem is compounded further by the addition of new Internet and customer-facing applications from multiple vendors. The typical clicks and mortar company has dozens of e-commerce and product-based systems containing millions of records with customer information without the ability to consolidate the data into a common customer view. Maintaining profitable customer relationships in such an environment requires a new approach. The Customer Context Server application uses a set of frameworks and subsystems operating on an object database to assemble and deliver, within a second, a continuously updated Customer Context to all customer touchpoints even in extremely high volume situations. The Customer Context Server application enables customer conversations to continue where they left off in a multi-vendor environment. The heart of the Customer Context Server application is the scalable Update Stream Processori (USP), which performs asynchronous contention-free updates on hundreds of processors concurrently. Several of the subsystems will be demonstrated including the active modeling and mapping systems used to refine the customer-relationship object mode] and assemble objects from record-based input data. © 2000 ACM.

关键词： object-oriented databases

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OORF: An object-oriented route finder 00

OORF: An object-oriented route finder

引用

2000 ACM Symposium on Applied Computing, SAC 2000

作者： Anwar, Muhammad Abaidullah Yoshida, Takaichi Kyushu Institute of Technology 680-4 Kawazu Iizuka 820-8502 Japan

ISBN: (纸本)1581132409

Travelling is a part of human beings day-to-day life. The huge and complicated road network in a country makes it difficult to find a shortest (best) route for travelling from one place to another. Many shorts route finding algorithms have been designed. Since route finding involves a massive and complicated road network data therefore, it is necessary to arrange the data in such a way that it's retrieval, especially a part of the road or road sub-network in a specific part of the country, should be efficient and unnecessary data processing is avoided. This paper presents an object-oriented road network data model in which we divide the road into road segments and road network into road sub-networks, into levels in which a country is divided administratively, i.e. prefectures, cities, etc. We have implemented the model for shortest route finding. © 2000 ACM.

关键词： object-oriented databases

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Virtual Web Plant An Internet-Based Plant Engineering Information System

Virtual Web Plant An Internet-Based Plant Engineering Inform...

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ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2000

作者： Ebbesmeyer, Peter Gausemeier, Jürgen Krumm, Holger Molt, Thorsten Gruß, Thomas UNITY AG Riemekestraße 160 Paderborn33106 Germany Heinz Nixdorf Institute University of Paderborn Fürstenallee 11 Paderborn33102 Germany SIEMENS KWU Freyeslebenstraße 1 Erlangen91058 Germany

ISBN: (纸本)9780791835111

The European Pressurized Water Reactor Project (EPR) is based on an innovative design concept for a new type of pressurized water reactor. The development of this concept will be carried out by a consortium of international partners and customers based in Germany and France. During the development of the EPR large amounts of up-to-date engineering data (i.e. CAD data, planning documentation) have to be made available to all project partners for presentation and development. This paper describes the web-based tool Virtual Web Plant (VWP), a tool to integrate 3D models from various CAD plant design tools and to display them interactively. The tool receives the data through the Internet. We describe the special advantages of an object-oriented database for the storage of the graphical data are shown. Through the application of object-oriented databases, it is possible to define various views of the logical plant structure, for example. The user is hereby able to navigate easily through both the plant structure and the project documentation. The work presented in this paper is part of a Virtual Reality Research Project of the Heinz Nixdorf Institute and the Siemens AG KWU. Copyright © 2000 by ASME.

关键词： object-oriented databases

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Incremental maintenance of materialized OQL views 3

Incremental maintenance of materialized OQL views

引用

3rd ACM International Workshop on Data Warehousing and OLAP, DOLAP 2000

作者： Ali, M. Akhtar Fernandes, Alvaro A.A. Paton, Norman W. Dept. of Computer Science University of Manchester ManchesterM13 9PL United Kingdom

ISBN: (纸本)1581133235

The importance of materialized views has grown significantly with the advent of data warehousing and OLAP technology. This increases the relevance of solutions to the problem of incrementally maintaining materialized views. So far, most work on this problem has been confined to relational settings. Proposals that apply to object databases have either used non-standard models or fallen short of providing a comprehensive framework. This paper contributes a solution to the incremental view maintenance problem for a large class of views expressed in OQL, the query language of the ODMG standard for object databases. The solution applies to immediate update propagation, and works for any update operation on views defined over a substantial subset of ODMG types. The approach presented has been fully implemented and preliminary performance results are reported. © 2000 ACM.

关键词： object-oriented databases

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Polar: An Architecture for a Parallel ODMG Compliant object Database 00

Polar: An Architecture for a Parallel ODMG Compliant Object ...

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9th International Conference on Information and Knowledge Management (CIKM 2000)

作者： Smith, Jim Watson, Paul Mendes Sampaio, Sandra de F. Paton, Norman Department of Computing Science University of Newcastle upon Tyne Newcastle upon TyneNE1 7RU United Kingdom Department of Computing Science University of Manchester Oxford Road ManchesterM13 9PL United Kingdom

ISBN: (纸本)9781581133202

object database management systems (ODBMS) are now established as the database management technology of choice for a range of challenging data intensive applications. Furthermore, the applications associated with object databases typically have stringent performance requiremefc, and some are associated with very large data sets. However despite the demands made on object databases by applications, there has been surprisingly little work on parallel object databases. This paper presents the arc hitecture and some preliminary performance results for the Polar ODMG compliant parallel object database. The architecture described has basn implemented in a shared-nothing environment on a network of PCs. The paper describes how OQL queries are compiled, parallelized and executed in this environment, and includes some preliminary performance results for OQL queries using the 007 benchmark. © ACM 2000.

关键词： object-oriented databases

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A smart pointer technique for distributed spatial databases 13th

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13th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, IEA/AIE 2000

作者： Karam, Orlando Petry, Fred Shaw, Kevin Wofford College United States Tulane University United States NRL-SSC United States

ISBN: (纸本)3540676899

We are developing a distributed object oriented spatial database prototype. We are extending the GIDB prototype (developed at NRL for using and querying OVPF databases) to support distribution. GIDB is a Geographical Information System coupled with an object oriented spatial database, which is implemented using the GemStone object Database. We are currently exploring alternatives to add distribution to the prototype. We tried GemEnterprise as our distributed OODB, but needed to add a different model of distribution to it. In order to do so, we used a smart pointer technique, taking advantage of the dynamic capabilities of the SmallTalk language. Also, we did several experiments comparing performance of returning a smart pointer from a remote method, or returning a copy of the remote object. The smart pointer usually is smaller, so the transmission cost is smaller, but future messages have to be done remotely instead of locally. © Springer-Verlag Berlin Heidelberg 2000.

关键词： object-oriented databases

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WDBQS: A Unified Access To Distant databases Via A Simple Web-Tool 11th

WDBQS: A Unified Access To Distant Databases Via A Simple We...

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11th International Conference on Database and Expert Systems Applications, DEXA 2000

作者： Sallaberry, Christian Andonoff, Eric Belloir, Nicolas Université de Pau et des Pays de l’Adour UFR Droit & IAE Pau64000 France IRIT/UT1 Université Toulouse 1 1 place Anatole France Toulouse Cedex31042 France

ISBN: (纸本)9783540679783

Within organisations, Information Systems are characterised by heterogeneity. The main management tools are different Relational and object oriented DataBase Management Systems. Therefore, variety, complexity and lack of integration make it difficult for casual users to query them. This paper presents WDBQS (Web DataBase Query System);a Web-interface for querying distant Relational and object oriented databases. This system, dedicated to casual users, proposes simple Web mechanisms to navigate through database schemas, build queries and display results. © Springer-Verlag Berlin Heidelberg 2000.

关键词： object-oriented databases

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Mechanisms for specifying communication behavior in object oriented database systems 00

Mechanisms for specifying communication behavior in object o...

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2000 ACM Symposium on Applied Computing, SAC 2000

作者： Pires, Paulo F. Benevides, Mário Roberto F. Mattoso, Marta Computer Science Department COPPE - Federal University of Rio de Janeiro P.O. Box 68511 Rio de Janeiro RJ 21945-970 Brazil

ISBN: (纸本)1581132409

Most object oriented concurrency control is dedicated to increase method execution concurrency, however they do not consider the inter-object behavior. In this paper we present mechanisms to deal with the communication behavior in OODBMS. We define linguistic constructors that describe both the internal and the external object communication behavior. We also present a decentralized transaction model and a protocol that guarantee the correct method execution for a single object (intra-object) and for a group of objects (inter-object) that cooperate to accomplish an activity. © 2000 ACM.

关键词： object-oriented databases

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Maximizing reusability: Seeking appropriate positions for derived classes within the class hierarchy 00

Maximizing reusability: Seeking appropriate positions for de...

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2000 ACM Symposium on Applied Computing, SAC 2000

作者： Alhajj, Reda Polat, Faruk Department of Math and Computer Science American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Computer Engineering Middle East Technical University Ankara Turkey

ISBN: (纸本)1581132409

This paper addresses reusability maximization by investigating the proper location of a derived class in the class hierarchy. We categorize derived classes into four groups, depending on whether their superclasses and subclasses are known, and present two algorithms that investigate reusability maximization. The first algorithm decides on the possibility of adapting some existing related classes in the lists of superclasses of derived classes. The second algorithm checks the possibility of adding derived classes to the lists of superclasses of some other existing related classes to have the latter classes inheriting things instead of duplication. © 2000 ACM.

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