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检索条件"主题词=object-oriented databases"

共 913 条记录，以下是421-430 订阅

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An object-Field Perspective Data Model for Moving Geographic Phenomena

An Object-Field Perspective Data Model for Moving Geographic...

引用

15th International Conference on DASFAA 2010

作者： Kim, K-S Kiyoki, Y. Natl Inst Informat & Commun Technol Knowledge Creating Commun Res Ctr 3-5 Hikaridai Seika Kyoto 6190289 Japan Keio Univ Fac Environm Informat Fujisawa Kanagawa Japan

ISBN: (纸本)9783642145889

We propose a new data model to represent dynamic and continuous geographic phenomena over spatiotemporal domain in moving-object databases. Existing data models of moving objects have shortcomings with respect to the representation of moving geographic phenomena involving continuous fields, such as temperature, elevation, and the degree of pollution. Moreover, in the case of a spatiotemporal model for continuous fields, it is difficult to deal with continuous movements through time. In this paper, we define a data type called moving field to represent both object-based and field-based views of geographic phenomena in spatiotemporal domains. The main feature of our model is that it integrates the spatial field model with the slice representation of moving objects. By introducing moving fields, we provide a new computational environment for analyzing various moving phenomena with numerical as well as geographic processing.

关键词： object-oriented databases

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A Novel Framework for Storage, Analysis and Integration through Mediation of Large-scale Electrophysiological Data

A Novel Framework for Storage, Analysis and Integration thro...

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5th International IEEE Engineering-in-Medicine-and-Biology-Society (EMBS) Conference on Neural Engineering (NER)

作者： Ljungquist, Bengt Petersson, Per Schouenborg, Jens Johansson, Anders J. Garwicz, Martin Lund Univ Neuronano Res Ctr S-22184 Lund Sweden

ISBN: (纸本)9781424441419

We present a framework based on object orientation with novel principles for how to store, analyze and integrate electrophysiological data. These principles are: (I) Using a Decorator pattern for storing analysis data in an object model, (II) using a Core Classes data structure for integration through mediation in a service bus architecture, and (III) choosing the single unit as the finest structure of the object model. With these principles, we address the problems of (1) how to relate the analysis data to the original electrophysiological data by utilizing design patterns, (2) how to integrate data from different data sources, both at application and organization levels and (3) avoiding performance problems by choosing the correct level of object granularity for the data.

关键词： Data models Data structures databases Electrophysiology MATLAB Mathematical model object oriented modeling RDBMS bioelectric phenomena core classes data structure data analysis data analysis data integration data storage data structures decorator pattern large-scale electrophysiological data medical information systems neuroinformatics neurophysiology object orientation based framework object-oriented databases relational database management systems relational databases service bus architecture

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Design of fuzzy querying in object-oriented spatial data and geographic information systems

Design of fuzzy querying in object-oriented spatial data and...

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1998 Conference of the North American-Fuzzy-Information-Processing-Society

作者： Morris, A Petry, FE Tulane Univ Dept Elect Engn & Comp Sci Ctr Intelligent & Knowledge Based Syst New Orleans LA 70118 USA

ISBN: (纸本)0780344537

Fuzzy set approaches are particularly suitable for issues of modeling uncertainty in spatial data. We survey where and how uncertainty may appear in spatial data. We consider the issues involved in developing the modeling of uncertain spatial data in the framework of object-oriented databases. Finally we outline the issues in an approach for implementing fuzzy spatial queries in a commercially available object-oriented database.

关键词： geographical information systems spatial databases object-oriented databases spatial accuracy spatial relationships fuzzy logic

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Virtual repository supporting integration of pluginable resources

Virtual repository supporting integration of pluginable reso...

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17th International Conference on Database and Expert Systems Applications

作者： Kuliberda, Kamil Blaszczyk, Piotr Balcerzak, Grzegorz Kaczmarski, Krzysztof Adamus, Radoslaw Subieta, Kazimierz Tech Univ Lodz PL-90924 Lodz Poland Warsaw Univ Technol PL-00661 Warsaw Poland PAS Inst Comp Sci Warsaw Poland Polish Japanese Inst Informat Technol Warsaw Poland

ISBN: (纸本)0769526411

The paper describes a dynamic integration mechanism for a virtual repository that transparently integrates distributed, heterogeneous and redundant resources. The repository is based on combination of a P2P network, object-oriented databases, a query language SBQL and virtual updateable views defined and. used in SBQL. It is currently implemented as a prototype under .NET in C#. We also discuss a solution for an independent virtual P2P network integrating resources stored in databases and a novel global index mechanism.

关键词： object-oriented databases

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View planning for efficient contour-based 3D object recognition

View planning for efficient contour-based 3D object recognit...

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15th IEEE Mediterranean Electrotechnical Conference (MELECON 2010)

作者： Urdiales, C. de Trazegnies, C. Pacheco, J. Sandoval, F. Univ Malaga ISIS Grp ETSI Telecommun E-29071 Malaga Spain

ISBN: (纸本)9781424457953

This paper presents a method for capture planning in view based 3D recognition. Views are represented by their contours, encoded into curvature functions, which are reduced into compact feature vectors by Principal Component Analysis. These vectors are very resistant against transformations, so they can be assumed to be distributed over the surface of a sphere with the object in its center. After clustering these vectors, 3D objects are represented via Hidden Markov Models where classes are states. To recognize an object in a minimum number of steps, we propose to align candidate cluster representations and then subtracting their cluster maps to decide in which locations they differ the most. Then, a TSP is used to decide in which order these distinctive locations are visited. The proposed approach has been successfully tested with several artificial 3D object databases, even though it still presents some errors in objects with strong symmetries.

关键词： object-oriented databases

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Querying graph databases 7

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7th International Conference on Extending Database Technology

作者： Flesca, S Greco, S Univ Calabria DEIS I-87030 Arcavacata Di Rende Italy

ISBN: (纸本)3540672273

Graph data is an emerging model for representing a variety of database contexts ranging from object-oriented databases to hypertext data. Also many of the recursive queries that arise in relational databases are, in practice, graph traversals. In this paper we present a language for searching graph-like databases. The language permits us to express paths in a graph by means of extended regular expressions. The proposed extension is based on the introduction of constructs which permit us i) to define a partial order on the paths used to search the graph and, consequently, on the answers of queries, and ii) to cut off, nondeterministically, tuples with low priority. We present an algebra for partially ordered relations and an algorithm for the computation of path queries. Finally, we present applications to hypertext databases such as the Web.

关键词： object-oriented databases

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Deformable 3D Reconstruction with an object Database

Deformable 3D Reconstruction with an Object Database

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23rd British Machine Vision Conference

作者： Alcantarilla, Pablo F. Bartoli, Adrien Univ Auvergne CNRS ISIT UMR 6284 Clermont Ferrand France

ISBN: (纸本)1901725464

Deformable 3D reconstruction from 2D images requires prior knowledge on the scene structure. Template-free methods use generic prior knowledge such as piecewise smoothness but require multiple images with significant baseline. Template-based methods require only one image but handle only one object for which they need specific prior knowledge, namely a 3D template. We here propose a novel method that alleviates the strong assumptions of both the template-free and template-based methods: our method uses multiple templates to achieve deformable 3D reconstruction from only one image and for multiple objects. It uses object recognition to automatically discover what objects are visible in the input image and to select the appropriate templates for deformable 3D reconstruction. The object database is built offline. Crucially, this database does not only contain appearance descriptors as in existing object recognition frameworks, but also material properties to facilitate deformable 3D reconstruction. We show successful experimental results with objects made of various materials such as paper, cloth and plastic.

关键词： object-oriented databases

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Using Metamodel of object System for Domain-Driven Design the Database Structure 12

Using Metamodel of Object System for Domain-Driven Design th...

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Proceedings of IEEE East West Design and Test Symposium ( EWDTS 2014)

作者： Oleynik, Pavel P. Aston DISC Syst Architect Software Rostov Na Donu Russia

This article describes an object-oriented design process of simple database application in terms of object system metamodel assuming the construction of conceptual. logical and physical models.

ISBN: (纸本)9781479976300

This article describes an object-oriented design process of simple database application in terms of object system metamodel assuming the construction of conceptual. logical and physical models.

关键词： data structures object-oriented databases conceptual models database application database structure domain-driven design logical models object system metamodel object-oriented design process physical models Abstracts databases object oriented modeling Unified modeling language object oriented modeling object-oriented databases physical models UML Database Conceptual Modelling Data structures Database applications

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Expressing constraint models in object oriented Data using UML and ODL 4th

Expressing constraint models in Object Oriented Data using U...

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4th International Workshop on Distributed Computing

作者： Chattopadhyay, S Roy, C Chattopadhyay, M Univ Jadavpur Dept Informat Technol Kolkata 700098 India RCC Inst Informat Technol Kolkata India Jadavpur Univ Dept Elect Engn Sch Educ Technol Kolkata 700032 W Bengal India

ISBN: (纸本)354000355X

Modeling of constraints in object oriented Data Model has been the focus of attention of many researchers in recent times [1, 2, 8, 13, 14]. In this paper, we attempt to further formalize the constraint model described in [3]. First, necessary extensions of UML meta-model is examined to express the constraint-model of [3]. The motivation behind expressing constraint models in UML is formalization. It is expected that such formalization effort would lead to the development of sound software tools for analysis and synthesis. The second objective is to establish the correspondence between the extended model and a standard object database model developed by ODMG. This correspondence is established in ODL by extending the standard specified by ODMG. Such formalizations not only shows the expressive power of the model but these correspondences do also enhance the portability of the schema of object oriented databases across different vendors.

关键词： object-oriented databases

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Migrating legacy systems towards object-oriented platforms

Migrating legacy systems towards object-oriented platforms

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International Conference on Software Maintenance

作者： DeLucia, A DiLucca, GA Fasolino, AR Guerra, P Petruzzelli, S Univ of Salerno Benevento Italy

ISBN: (纸本)081868013X

We present an approach to migrate legacy systems to object-oriented platforms. The process consists of six sequential phases and encompasses reverse engineering and re-engineering activities. The aim of the reverse engineering phases is to decompose programs into components implementing the user interface management and components implementing application domain objects. The identification of objects is centred around persistent data store and exploits object-oriented design metrics. Wrapping techniques are the core of the re-engineering activities They make new systems able to exploit existing resources, thus allowing an incremental and selective translation of the identified objects.

关键词： software maintenance object-oriented programming object-oriented databases object-oriented methods reverse engineering systems re-engineering software metrics user interface management systems subroutines legacy systems migration object-oriented platforms sequential phases reverse engineering activities reengineering activities program decomposition program components user interface management application domain objects object identification persistent data store object-oriented design metrics wrapping techniques existing resources exploitation incremental translation selective translation

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