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检索条件"主题词=Object-oriented Databases"

共 913 条记录，以下是101-110 订阅

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View planning for efficient contour-based 3D object recognition

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

引用

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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A P2P object-oriented database system that supports multi-attribute and range queries with improved query response time

A P2P object-oriented database system that supports multi-at...

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2010 International Symposium on Information Technology, ITSim'10

作者： Wei, Goh Chiao Ming, Lim Tong School of Computer Technology Sunway University College Bandar Sunway Malaysia

ISBN: (纸本)9781424467181

Nowadays, the demand for the processing and storing of data has been growing exponentially rapid. The massive demand of these data has limited the traditional way of storing and processing data based on client/server architecture. To overcome this bottleneck, a peer-to-peer object-oriented database is proposed because of its robustness, fault-tolerance, scalability and less administrative nature. Chord is a structured P2P overlay network providing indexing facility enables users to locate a piece of data based on a given key through an efficient routing algorithm. The proposed object-oriented database is built on the openChord, a Chord implementation. In this paper, we present a preliminary design for a P2P object-oriented database on the openChord which supports multi-attribute and range queries. The storing and processing of objects are managed locally to reduce the network traffic. Pointers of objects are stored around the routing path of nodes to efficiently access to a desired object to reduce storage cost and to preserve the object-oriented features. Nodes holding the object pointers are distributed around the network to reduce the lookup time. Nodes are organized into logical class hubs where each hub handles pointers to nodes storing objects belonging to a particular class. Queries involving multi-attributes and ranges are routed to the related class hubs to retrieve the desired objects. Our proposed system will be tested using an Order Picking application for a warehouse with only dozens of nodes connected in a wireless local area network. Tests were carried out with another P2P database system measured on reliability and performance of both P2P database systems. © 2010 IEEE.

关键词： object-oriented databases

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Design and application of data migration system in hetertogeneous database

Design and application of data migration system in hetertoge...

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International Forum on Information Technology and Applications

作者： Xing, Lixian Li, Yanhong Baoding 071003 China

ISBN: (纸本)9780769541150

With the development of economic system reform in China, trans-regional economy presents rapid growth trend, and requires establishing an rapid, stable trans-regional clearing system between banks. In this paper we study the approach and process of data migration and take a bank's database as an example Especially, we introduce the basic functions of each module in data migration process and the test procedures after data migration The process of data migration have two steps. First, tables to be migrated, primary key and foreign key are created in object database Then data in source database are migrated into object database. This paper is based on database migration project and detailedly introduces technique issues of data migration involving manual work, which may contribute to organizations that have data migration demonds. © 2010 IEEE.

关键词： object-oriented databases

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A Framework for Fuzzy Video Content Extraction, Storage and Retrieval

A Framework for Fuzzy Video Content Extraction, Storage and ...

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2010 IEEE World Congress on Computational Intelligence

作者： Koyuncu, Murat Yilmaz, Turgay Yildirim, Yakup Yazici, Adnan Atilim Univ Dept Informat Syst Engn TR-06836 Ankara Turkey

ISBN: (纸本)9781424469208

This study presents a new comprehensive framework for semantic content extraction from raw video, storage of the extracted data and retrieval of the stored data. objects, spatial relations between objects, events and temporal relations between events, which are considered as semantic contents of the video, are extracted automatically to a certain extend with the developed approach. Extraction process is supported by manual annotation when automatic extraction is not satisfactory. The extracted information is stored in an intelligent fuzzy object-oriented database in which the database is enhanced with a fuzzy knowledge-based system. Domain specific deduction rules can be defined to derive new information about semantic contents of the video. The database is also supported by an access structure to increase retrieval efficiency. The proposed framework is capable of handling uncertain data arising from annotation process or video nature.

关键词： access structure content-based retrieval data handling data handling deductive databases domain specific deduction rules feature extraction fuzzy knowledge-based system fuzzy object-oriented database fuzzy video content extraction knowledge based systems manual annotation object-oriented databases semantic content extraction spatial-temporal relations temporal databases video databases video retrieval video storage

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The predicate formulae for object-oriented database schema evolution

The predicate formulae for object-oriented database schema e...

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World Congress on Software Engineering

作者： Lin, Jie Yu, Jiankun Zeng, Zhiyong Information School Yunnan University of Finance and Economics Kunming China

ISBN: (纸本)9780769543031

object-oriented database system is a superior model than relational database system, with schema evolution capacity. Although since the emergence of object-oriented database systems many schema evolution methods have been proposed, a complete formal description haven't been formed. Therefore, it is necessary to use predicate logic to describe the operation of object-oriented database. This paper introduces predicate logic to illustrate schema evolution of object-oriented database with the predicate formulae. Atomic formulae and formulae are presented and the class evolution invariants and rules are also formalized. © 2010 IEEE.

关键词： object-oriented databases

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Extensions to starburst: objects, types, functions and rules 10

Extensions to starburst: Objects, types, functions and rules

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CASCON First Decade High Impact Papers

作者： Lohman, Guy M. Lindsay, Bruce Pirahcsh, Hamid Schiefer, Bernhard IBM Almaden Research Center San Jose CA 95120 United States IBM Canada Laboratory 895 Hon Mills Road Toronto ON M3C 1W3 Canada

Starburst is a research prototype of an extensible relational database management system that is under development at the IBM Almaden Research Center. Through extensions to Starburst, we are incorporating the advanced structuring and data behavior features offered by object-oriented database management systems, while retaining the significant gains in data independence and data integrity of the relational model and upward compatibility with its standard access language, SQL. Some of the advanced features supported by Starburst extensions, described in this paper, include hierarchies of user-defined types and functions, large unstructured and stniclurcd complex objects, and user-defined rules to respond to changes in the database. Note: For a complete copy of this paper, please refer to the October 1991 publication of Communications of the ACM.

关键词： object-oriented databases

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Database modeling of enterprise management information system based on UML

Database modeling of enterprise management information syste...

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International Conference on Computational Intelligence and Software Engineering

作者： Yang, Jing School of Electrical and Electronic Engineering Departments East China Jiaotong University Nanchang China

ISBN: (纸本)9781424453924

In order to meet the complicated data connection between multi businesses, to meet the original business change on structure and application, to meet the multi-user management, we designed the unified database model of user-defined businesses based on those concepts of Business, ManageClass, Indice, Indice-Group, User, Instance and so on. This paper introduces the object-oriented database modeling technology based on UML, applies it in the underlying database design of the electrical MIS, and finally realizes ODM, CDM and PDM of this database. ©2010 IEEE.

关键词： object-oriented databases

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A model and a language for large textual databases

A model and a language for large textual databases

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18th Italian Symposium on Advanced Database Systems, SEBD 2010

作者： Maurizio, Marek Orsini, Renzo Department of Computer Science Ca' Foscari Venice University Via Torino 155 Venezia Mestre Italy

ISBN: (纸本)9788874883691

The markup approach to represent and store large corpora of annotated textual documents is criticized for several reasons: it poses problems in expressing non-hierarchical structures, it limits the annotations in type and complexity, it makes difficult the writing of complex textual analysis programs since it requires the use of generic query languages like XQuery which are not well suited to the special need of the domain. We present a model and a language, called Manuzio, developed to be at the base of a new generation of textual document management systems which overcome the previous shortcomings. The model is an object based one, specialized for the specific domain, and has abstraction mechanisms which present some similarities with those of the object oriented database models. The language has query facilities and allows the development of sophisticated textual analysis applications. A prototype for a system has been designed and applied to several test cases.

关键词： object-oriented databases

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Automatic fuzzy semantic web ontology learning from fuzzy object-oriented database model

Automatic fuzzy semantic web ontology learning from fuzzy ob...

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21st International Conference on Database and Expert Systems Applications, DEXA 2010

作者： Zhang, Fu Ma, Z.M. Fan, Gaofeng Wang, Xing College of Information Science and Engineering Northeastern University Shenyang 110819 China

ISBN: (纸本)3642153631

How to construct Web ontologies that meet applications' needs has become a key technology to enable the Semantic Web. Manual development of ontologies remains a cumbersome and time-consuming task. In real-world applications, however, information is often vague or ambiguous. Thus, developing approaches and tools for constructing fuzzy ontologies by extracting domain knowledge from huge amounts of existing fuzzy databases can facilitate fuzzy ontology development. In this paper, we propose a formal approach and an automated tool for constructing fuzzy ontologies from fuzzy object-oriented database (FOOD) models. Firstly, we introduce the fuzzy ontology, which consists of the fuzzy ontology structure and instances. Then, the FOOD models are investigated, and we propose a kind of formal definition of FOOD models. On this basis, we develop a formal approach that can translate the FOOD model and its corresponding database instances into the fuzzy ontology structure and the fuzzy ontology instances, respectively. Furthermore, following the proposed approach, we implement an automated learning tool, which can automatically construct fuzzy ontologies from FOOD models. Case studies show that the approach is feasible and the automated learning tool is efficient. © 2010 Springer-Verlag.

关键词： object-oriented databases

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Utilizing treemaps for multicriterial search of 3D objects 1

Utilizing treemaps for multicriterial search of 3D objects

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1st International Symposium on Visual Analytics Science and Technology, EuroVAST@EuroVis 2010

作者： Petkos, Georgios Darlagiannis, Vasilios Moustakas, Konstantinos Tzovaras, Dimitrios Center for Research and Technology Hellas Informatics and Telematics Institute Greece

ISBN: (纸本)9783905673746

We propose a treemap based interface for presentation of search results according to multiple search criteria. Different colors are used to represent the relevance of each item in the database according to the different search criteria, while at the same time the treemap based representation allows the user to visually identify relevant groups of data, exploiting the hierarchical organization of the items in the database. Items are ranked according to each criterion and an aggregate ranking is computed using the Borda algorithm. Furthermore, appropriate interaction mechanisms are provided in order to assist the user in refining the presentation of the returned items and weigh the contribution of different criteria for retrieving combined search results. The Princeton benchmark 3D object database is used for this study, nevertheless the technique presented is appropriate for any multicriterial search application and in particular in cases where the data is organized hierarchically. © The Eurographics Association 2010.

关键词： object-oriented databases

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