Modeling real-world applications typically consists of two parts: the representations of entities of interest, and the representations of relationships among the entities. object-oriented data models support the first...
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Modeling real-world applications typically consists of two parts: the representations of entities of interest, and the representations of relationships among the entities. object-oriented data models support the first task. This paper argues through examples that the second modeling task is not well supported in current object-oriented database systems. An extended object-oriented data model that facilitates both modeling tasks is developed. This extension provides support for both the representation of complex relationships among entities and their manipulations (queries, updates). A prototype implemented on the ONTOS database management system is briefly described. (C) 1999 Elsevier Science B.V. All rights reserved.
This paper addresses the need for a semantic video-object approach for efficient storage and manipulation of video data to respond to the needs of several classes of potential applications when efficient management an...
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ISBN:
(纸本)9729805067
This paper addresses the need for a semantic video-object approach for efficient storage and manipulation of video data to respond to the needs of several classes of potential applications when efficient management and deductions over voluminous data are involved. We present the VIGILANT model for content and event-based retrieval of video images and clips using automatic annotation and indexing of contents and events representing the extracted features and recognised objects in the images captured by a video camera in a car park environment. The underlying video-object model combines object-oriented modelling (OO) techniques and Description Logics (DLs) Knowledge representation. The OO technique models the static aspects of video clips and instances and their indexes will be stored in an object-oriented Database. The DLs model will extend the OO model to cater for the inherent dynamic content descriptions of the video, as events tend to spread over a sequence of frames.
Semantic relations between concepts or data are common modelling devices in various knowledge representation approaches. Fuzzyrelations can be defined as fuzzy subsets of the cartesian product of a number of domains, ...
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In this paper, we show that the IIS-MDR offers the integrated information to the enterprise by making it possible to exchange data between the regionally distributed heterogeneous computers and also to access various ...
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objectorienteddatabases (OODB) have been portrayed as being the solution for complex applications such as Geographical Information Systems (GIS). One problem found with current GIS is that they concentrate on spatia...
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ISBN:
(纸本)9729805067
objectorienteddatabases (OODB) have been portrayed as being the solution for complex applications such as Geographical Information Systems (GIS). One problem found with current GIS is that they concentrate on spatial data, rather than aspatial, ideally both should be able to be accessed within the one system. This paper discusses the development of a GIS that integrates both environments, which uses an object-oriented database and persistent programming technology.
Recently much research has been done in applying database technology to tracking moving objects. Most techniques assume a predictable linear motion. We present a new application for moving objectdatabases, characteri...
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Motives for using a database management system (DBMS) to build a knowledge base system (KBS), include KBS’s lack of ability to manage large sets of rules, to control concurrent access and to manage multiple knowledge...
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Due to its portability and popularity for Internet applications, Java has become one of the major programming languages. The similar syntax inherited from the C language and the pure objectoriented features, compared...
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An object algebra that can be used for supporting the ODMG standard is formally defined. The algebra is represented by a number of special forms of expressions serving for querying the current database state. Quantifi...
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Conventional object-oriented database (OODB) systems follow a class-based approach to model real world entities and their relationships, which imposes several difficulties when more advanced "dynamic functions&qu...
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Conventional object-oriented database (OODB) systems follow a class-based approach to model real world entities and their relationships, which imposes several difficulties when more advanced "dynamic functions" are needed by the applications. One of such dynamic functions is conceptual clustering - the ability to dynamically group a set of existing objects together as a higher-level abstract object (called a "cluster"). The conceptual clustering model (CCM) that we have defined is an extension to current object-oriented models, which facilitates the modeling of dynamic, evolving, and/or ad hoc object clusters through a well-devised clustering mechanism that incorporates "roles". This paper presents the advanced features of CCM, along with its associated query language facilities devised for supporting general definition and access of clusters (and roles). An experimental prototype of the CCM has been constructed on top of a persistent object storage manager, running on a Sun4 workstation.
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