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1st International Conference on Software and Data Technologies

作者： Maia, Rodrigo Filev Almeida Junior, Jorge Rady EPUSP Ave Prof Luciano Gualberto158 Trav 3 BR-05508900 Sao Paulo Brazil

ISBN: (纸本)9728865694

This paper describes the main characteristics involved in the process of using multimedia content in the Internet sites and it presents a proposal for an implementation of an object-oriented database, in order to assist the multimedia data exigency in a dynamic website. It is described an implementation of the proposed architecture, consisting of a virtual museum made for the Contemporary Art Museum of the USP, called Virtual MAC, which was elected as the 3(rd) best virtual museum of the world by INFOLAC Web 2005 (UNESCO). The main objective of Virtual MAC is to create a virtual collection of works at art and make it available on Internet. Our analysis shows that it is more appropriate to use the object oriented paradigm instead of Relational Modelling due to the nature of the multimedia data and the structure of the dynamic web site used for the Virtual MAC.

关键词： virtual museum object-oriented database multimedia content

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Modeling of the consistency problem in object-oriented database

Modeling of the consistency problem in object-oriented datab...

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12th ISSAT International Conference on Reliability and Quality in Design

作者： Wang, Mei-Tzu Chinese Culture Univ Dept Informat Management Taipei Taiwan

ISBN: (纸本)0976348616

The problem of how to maintain the consistent state of a database is one of the important issues in the research of database area. There have been several researches aimed at this problem for relational database since two decades ago. But for object-oriented database, which has more complex structure than relational database, there is a need to have a more general framework to discuss this problem from additional aspects in more elaborate manner. The purpose of this paper is to propose a theoretical model, including various aspect of consistency, the methods of checking consistency, and how to enforce consistency in object-oriented database

关键词： object-oriented database consistency integrity constraints constraint satisfiability

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Optimization of object-oriented Queries Involving Weakly Dependent Subqueries

Optimization of Object-Oriented Queries Involving Weakly Dep...

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2nd International Conference, ICOODB 2009

作者： Bleja, Michal Kowalski, Tomasz Adamus, Radoslaw Subieta, Kazimierz Univ Lodz Fac Math & Comp Sci PL-90131 Lodz Poland Tech Univ Lodz Comp Engn Dept PL-90924 Lodz Poland Polish Japanese Inst Informat Technol Warsaw Poland Polish Acad Sci Inst Comp Sci Warsaw Poland

ISBN: (纸本)9783642146800

A new static optimization method in object query languages is presented. We introduce a special kind of subqueries of a query referred to as "weakly dependent subqueries". A subquery is weakly dependent if it depends from an external query operator only on an expression returning the result of an enumerated type. If a query contains such subqueries then we rewrite it to an equivalent form which guarantees much better performance. Our method is based on the stack-based approach (SBA) and its query language SBQL (Stack-Based Query Language) implemented in the ODRA system. SBA is relevant for a general object model and for its specific variants. Clean formal semantics and abstract implementation of SBQL, integration with the constructs of programming languages and advanced data structures give the possibility to investigate different areas that are related to query optimization techniques. The paper presents examples how the optimization method works. General and detailed features of the implemented algorithm are also presented.

关键词： query optimization weakly dependent subquery stack-based approach SBQL object-oriented database strong typing

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Reverse simulation for collaborative commerce: A study of integrating object-oriented database technology with object-oriented simulator

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INTERNATIONAL JOURNAL OF FLEXIBLE MANUFACTURING SYSTEMS 2005年第3期17卷 227-250页

作者： Du, Timon C. Li, Eldon Y. Rau, Hsin Lian, Guan-Yuan Chinese Univ Hong Kong Dept Decis Sci & Managerial Econ Hong Kong Hong Kong Peoples R China Natl Chengchi Univ Dept Management Informat Syst Taipei 11605 Taiwan

Collaborative commerce has been used for communication, design, planning, information sharing, and information discovery in business-to-business (B2B) applications. The collaboration between buyers and sellers enhances product quality and customer satisfaction. However, most effort currently focuses on information sharing with customers and suppliers instead of joint product development or manufacturing. Moreover, traditional analytical methods have limited capability in solving problems. This study presents a framework for doing reverse simulation, where designers can reuse past experiments and change system parameters in manufacturing system for collaborative commerce. The framework integrates the object-oriented simulator and the object-oriented database. In this framework, the object-oriented database records the whole experiment scenarios and allows multiple planners with different expertise to involve concurrently and collaboratively. Then, simulations of advanced planning and scheduling in a product manufacturing environment that involves several planners working collaboratively are used for demonstration.

关键词： collaborative commerce reverse simulation object-oriented database

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Implementation of an object oriented data model in an information system for water catchment management: Java JDO and Db4o object database

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ENVIRONMENTAL MODELLING & SOFTWARE 2007年第12期22卷 1805-1810页

作者： Leone, Andrea Chen, Daoyi Univ Liverpool Dept Engn Liverpool L69 3GQ Merseyside England

object-oriented technologies are playing increasingly important roles in every level of software application for water resource management and modelling. except for data management levels where the relational logic is still the uncontested choice of information system developers despite the object-relational impedance mismatch. In this paper, we would like to present our experience concerning two different technologies for developing the object-oriented data management layer in information systems for water resources management: (i) the Java solution to obtain transparent persistence, the Java Data object (JDO) technology;(ii) a purer object solution with a light open source object database, Db4o. The process for implementing the two technologies in a Java-based hydro-information system is described, and the two different solutions were analysed and compared. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： water catchment water resources management information system object-oriented database JDO Java object-oriented data model object-relational impedance mismatch open source GIS

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INCORPORATING FUZZINESS INTO ACTIVE RULES

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INTERNATIONAL JOURNAL OF UNCERTAINTY FUZZINESS AND KNOWLEDGE-BASED SYSTEMS 2008年第5期16卷 735-757页

作者： Bostan-Korpeoglu, Burcin Yazici, Adnan Middle E Tech Univ Dept Comp Engn TR-06531 Ankara Turkey

Knowledge intensive applications require an intelligent environment, which can perform deductions in response to user queries or events that occur inside or outside of the applications. For that, we propose a fuzzy active object-oriented database for modeling knowledge intensive applications. In that, we incorporate fuzziness within the event, condition and action parts of an active rule. We consider deductive rules as special cases of active rules so that deductive queries are handled using abstract kind of events. We also introduce a model for fuzzy inferencing of fuzzy active rules where we develop a model for scenario concept. We use a Fuzzy Petri Net model for fuzzy rule-based inference.

关键词： Active database object-oriented database fuzziness deductive rules fuzzy inference scenario fuzzy Petri net

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Modeling and querying fuzzy spatiotemporal databases

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INFORMATION SCIENCES 2008年第19期178卷 3665-3682页

作者： Soezer, Aziz Yazici, Adnan Oguztuezuen, Halit Tas, Osman Middle E Tech Univ Dept Comp Engn TR-06531 Ankara Turkey

Modeling spatiotemporal data, in particular fuzzy and complex spatial objects representing geographic entities and relations, is a topic of great importance ill geographic information systems, computer vision, environmental data management systems, etc. Because of complex requirements, it is challenging to represent spatiotemporal data and its features in databases and to effectively query them. This article presents a new approach to model and query the spatiotemporal data of fuzzy spatial and complex objects and/or spatial relations. In our case study, we use a meteorological database application in an intelligent database architecture, which combines an object-oriented database with a knowledgebase for modeling and querying spatiotemporal objects. (c) 2008 Elsevier Inc. All rights reserved.

关键词： object-oriented database spatiotemporal data fuzzy logic knowledgebase meteorological database application

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An equational logic based approach to the security problem against inference attacks on object-oriented databases

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JOURNAL OF COMPUTER AND SYSTEM SCIENCES 2007年第5期73卷 788-817页

作者： Ishihara, Yasunori Morita, Toshiyuki Seki, Hiroyuki Ito, Minoru Osaka Univ Grad Sch Informat Sci & Technol Suita Osaka 5650871 Japan Nara Inst Sci & Technol Grad Sch Informat Sci Nara 6300192 Japan

A query is said to be secure against inference attacks by a user if there exists no database instance for which the user can infer the result of the query, using only authorized queries to the user. In this paper, first, the security problem against inference attacks on object-oriented databases is formalized. The definition of inference attacks is based on equational logic. Secondly, the security problem is shown to be undecidable, and a decidable sufficient condition for a given query to be secure under a given schema is proposed. The idea of the sufficient condition is to over-estimate inference attacks using over-estimated results of static type inference. The third contribution is to propose subclasses of schemas and queries for which the security problem becomes decidable. Lastly, the decidability of the security problem is shown to be incomparable with the static type inferability, although the tightness of the over-estimation of the inference attacks is affected in a large degree by that of the static type inference. (c) 2007 Elsevier Inc. All rights reserved.

关键词： object-oriented database database security inference attack computational complexity

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Estimating nested selectivity in object-oriented and object-relational databases

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INFORMATION AND SOFTWARE TECHNOLOGY 2007年第7期49卷 806-816页

作者： Cho, Wan-Sup Hong, Ki-Hyung Loh, Woong-Kee Korea Adv Inst Sci & Technol Adv Informat Technol Res Ctr Dept Comp Sci Taejon 305701 South Korea Chungbuk Natl Univ Dept Management Informat Syst Brain Korea 21 Cheongju 361763 Chungbuk South Korea Sungshin Womens Univ Dept Comp Sci Seoul 136743 South Korea

A search condition in object-oriented/object-relational queries consists of nested predicates, which are predicates on path expressions. In this paper, we propose a new technique for estimating selectivity for nested predicates. Selectivity of a nested predicate, nested selectivity, is defined as the ratio of the number of the qualified objects of the starting class in the path expression to the total number of objects of the class. The new technique takes into account the effects of direct representation of the many-to-many relationship and the partial participation of objects in the relationship. These two features occur frequently in object-oriented/object-relational databases, but have not been properly handled in the conventional selectivity estimation techniques. For the many-to-many relationship, we generalize the block-hit function proposed by S.B. Yao to allow the cases that an object belongs to more than one block. For the partial participation, we propose the concept of active objects and extend our technique for total participation to handle active objects. We also propose efficient methods for obtaining statistical information needed for our estimation technique. We finally analyze the accuracy of our technique through a series of experiments and compare with the conventional ones. The experiment results showed that there was a significant inaccuracy in the estimation by the conventional ones, confirming the advantage of our technique. (c) 2006 Elsevier B.V. All rights reserved.

关键词： nested selectivity selectivity estimation nested predicates query optimization object-oriented database object-relational database

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Towards an intelligent database system founded on the SP theory of computing and cognition

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DATA & KNOWLEDGE ENGINEERING 2007年第3期60卷 596-624页

作者： Wolff, J. Gerard CognitionRes Org Uk Menai Bridge LL59 5LR Anglesey Wales

The SP theory of computing and cognition, described in previous publications, is an attractive model for intelligent databases because it provides a simple but versatile format for different kinds of knowledge, it has capabilities in artificial intelligence, it can function effectively in the face of errors in its input data, and it can function like established database models when that is required. This paper first describes the SP theory in outline and the computer models in which it is expressed. The main sections of the paper describe, with examples from the SP62 computer model, how the SP framework can emulate other abstract models used in database applications: the relational model (including retrieval of information in the manner of query-byexample, creating a join between two or more tables, and aggregation), object-oriented models (including class-inclusion hierarchies, part-whole hierarchies and their integration, inheritance of attributes, cross-classification and multiple inheritance), and hierarchical and network models (including discrimination networks). Comparisons are made between the SP model and those other models. The artificial intelligence capabilities of the SP model are briefly reviewed: representation and integration of diverse kinds of knowledge in one versatile format;fuzzy pattern recognition and recognition at multiple levels of abstraction;best-match and semantic forms of information retrieval;various kinds of exact reasoning and probabilistic reasoning;analysis and production of natural language;planning;problem solving;and unsupervised learning. Also considered are ways in which current prototypes may be translated into an 'industrial strength' working system. (c) 2006 Elsevier B.V. All rights reserved.

关键词： intelligent database information compression multiple alignment database model relational database object-oriented database hierarchical database network database

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