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检索条件"主题词=object-oriented databases"

共 913 条记录，以下是61-70 订阅

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On efficient map-matching according to intersections you pass by

On efficient map-matching according to intersections you pas...

引用

24th International Conference on Database and Expert Systems Applications, DEXA 2013

作者： Li, Yaguang Liu, Chengfei Liu, Kuien Xu, Jiajie He, Fengcheng Ding, Zhiming Institute of Software Chinese Academy of Sciences Beijing 100190 China FICT Swinburne University of Technology Australia University of Chinese Academy of Sciences Beijing 100049 China

ISBN: (纸本)9783642401725

Map-matching is a hot research topic as it is essential for Moving object Database and Intelligent Transport Systems. However, existing map-matching techniques cannot satisfy the increasing requirement of applications with massive trajectory data, e.g., traffic flow analysis and route planning. To handle this problem, we propose an efficient map-matching algorithm called Passby. Instead of matching every single GPS point, we concentrate on those close to intersections and avoid the computation of map-matching on intermediate GPS points. Meanwhile, this efficient method also increases the uncertainty for determining the real route of the moving object due to less availability of trajectory information. To provide accurate matching results in ambiguous situations, e.g., road intersections and parallel paths, we further propose Passby*. It is based on the multi-hypothesis technique and manages to maintain a small but complete set of possible solutions and eventually choose the one with the highest probability. The results of experiments performed on real datasets demonstrate that Passby*is efficient while maintaining the high accuracy. © 2013 Springer-Verlag.

关键词： object-oriented databases

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Performance comparison of relational database with object database (DB4o)

Performance comparison of relational database with object da...

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5th International Conference on Computational Intelligence and Communication Networks, CICN 2013

作者： Roopak, K.E. Rao, K.S. Swati Ritesh, S. Chickerur, Satyadhyan Department of Information Science and Engineering B v Bhoomaraddi College of Engineering and Technology Hubli Karnataka India

ISBN: (纸本)9780768550695

In the present day scenario of mobility and objects, the field of object oriented programming is gaining momentum not only in field of gaming, programming but also in area of DBMS. The paper discusses object oriented approach for solving queries. The queries are executed and analyzed specifically on an object oriented database DB4o. The industry is moving with time from basic models of DBMS to one such DBMS discussed in this paper. Experiments have been carried out using both DB4o and MySQL for a huge airport data base. The paper also discusses two factors namely Querying methodology and Performance analysis in comparison with traditional DBMS like MySQL. The proposed approach proves that ODBMS is more efficient compared to RDBMS. © 2013 IEEE.

关键词： object-oriented databases

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Resemblance object-Class Relationships in Fuzzy object-oriented databases

Resemblance Object-Class Relationships in Fuzzy Object-Orien...

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International Symposium on Computer Science and Computational Technology

作者： Ma, Z. M. Tianjin Univ Technol Tianjin Peoples R China

ISBN: (纸本)9780769534985

In this paper, some unique features of fuzzy object-class relationships, which do not occur in classical object-oriented databases, are investigated. We identify direct object-class relationship, indirect object-class relationship, and arbitrary object-class relationship in fuzzy object-oriented databases. In particular, soft computing methods are developed in the paper to quantitatively determine resemblance object-class relationships. The strategies to resolve the conflicts that an object belongs to multiple classes with different membership degrees simultaneously are hereby introduced

关键词： object-oriented databases

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Optimising schema evolution operation sequences in object databases for data evolution

Optimising schema evolution operation sequences in object da...

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31st International Conference on Conceptual Modeling, ER 2012

作者： Zäschke, Tilmann Leone, Stefania Norrie, Moira C. Institute for Information Systems ETH Zurich Zurich CH-8092 Switzerland

ISBN: (纸本)9783642340017

We propose an approach to optimising schema evolution operation sequences in object databases. The approach separates operations that add structures from those that remove structures so that all additions are performed before any removals. This separation ensures that there is always a state during schema evolution where data can be evolved from structures that are to be deleted to structures that are new or already exist. Our approach also reduces and groups the schema operations to simplify implementation of data evolution functions by developers. We present a case study used as a first evaluation of the approach. © 2012 Springer-Verlag.

关键词： object-oriented databases

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Probabilistic ranking in fuzzy object databases 12

Probabilistic ranking in fuzzy object databases

引用

21st ACM International Conference on Information and Knowledge Management, CIKM 2012

作者： Bernecker, Thomas Emrich, Tobias Kriegel, Hans-Peter Renz, Matthias Züfle, Andreas Institute for Informatics Ludwig-Maximilians-Universität-München Oettingenstr. 67 D-80538 Münich Germany

ISBN: (纸本)9781450311564

Ranking queries have been investigated extensively in the past due to their broad range of applications. In this paper, we study this problem in the context of fuzzy objects that have indeterministic boundaries. Fuzzy objects play an important role in many areas, such as biomedical image databases and GIS. To the best of our knowledge, we present the first efficient approach for similarity ranking in fuzzy object databases. The main challenge of ranking fuzzy objects is that these objects consist of multiple instances, each associated with a probability. We propose a framework to transform fuzzy objects into probabilistic objects which can then be ranked using existing algorithms for probabilistic objects. © 2012 ACM.

关键词： object-oriented databases

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An Approach to Convert object oriented Database into XML

An Approach to Convert Object Oriented Database into XML

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International Conference on Computer Science and Information Technology

作者： Yusra Yousef Amer Nael Hirzallah Faculty of Information Technology Amman Jordan Applied Science University

ISBN: (纸本)9781467356107

XML (eXtended Markup Language) has been widely used as the universal format for publishing and exchanging data in World Wide Web, due to its capability to support flexible representations of data. For that, the importance of transforming other data sources, such as object oriented Data Base (OODB) and Relational Database to XML, has increased. The goal of this paper is to develop an efficient method to transform OODB to XML that can be used by wide range of endusers who don't have to be specialists. Although the paper presents no novel approach, but it is mainly concerned with developing rule based methodology to convert OODB schema to XML schema.

关键词： object oriented XML Rules-based extensible markup language object orientation object-oriented databases Relational databases symbolic languages XML schema Convert

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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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Flexible approach for representing object oriented databases in XML format 08

Flexible approach for representing object oriented databases...

引用

10th International Conference on Information Integration and Web-based Applications and Services, iiWAS 2008

作者： Nasser, Taher Alhajj, Reda Ridley, Mick School of Informatics Bradford University West Yorkshire United Kingdom Dept of Computer Science University of Calgary Calgary AB Canada

ISBN: (纸本)9781605583495

In this paper, we address the representation of object-oriented databases in XML format. This will allow for better and platform independent sharing of data stored in object-oriented format. We handle the process by first applying a reverse engineering approach to extract what we call an object-graph from the object-oriented database. Then, we convert the object-graph into XML schema;we avoid DTD representation because XML schema is more flexible and widely accepted as part of the standardization of XML. Deriving the object-graph empowers the proposed approach to smoothly consider both the inheritance and the nesting hierarchies during the mapping into XML schema. We provide a user-friendly interface that displays the result of each phase of the conversion process. Test results are encouraging, demonstrating the applicability and effectiveness of the proposed approach. Copyright 2008 ACM.

关键词： object-oriented databases

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Using product access layer to hide the complexity of data storage from Herschel users

Using product access layer to hide the complexity of data st...

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12th International Conference on Space Operations, SpaceOps 2012

作者： Li, B. Liu, D. Guest, S. Huang, M. Balm, P. Bakker, J. Segovia, J.C. Saiz, J. Siddiqui, H. Edwards, K. National Astronomical Observatories Chinese Academy of Sciences B616 20A Datun Road Beijing 100012 China GSegment Space Technologies Inc. Beijing 100012 China Rutherford Appleton Laboratory Chilton Didcot Oxfordshire OX11 0QX United Kingdom National Astronomical Observatories Chinese Academy of Sciences 20A Datun Road Chaoyang Beijing 100012 China ESA Herschel Science Centre ESAC Villafranca del Castillo Spain SRON Netherlands Institute for Space Research Groningen Netherlands University of Waterloo Waterloo ON N2L 3G1 Canada

Launched on May 14, 2009, ESA's Herschel Space Observatory is the largest astronomical telescope ever launched. It is in routine science operations and has already generated data for more than 25000 observations. The users of Herschel data products are astronomers, data processing software developers, instrument engineers, and calibration scientists. Different users have different scenarios and requirements on data access. Different data storage systems and mechanisms (including commercial object oriented database, Herschel Science Archive, local disk, remote HTTP server and so on) are selected to build up data processing applications. We developed a software package named Product Access Layer (PAL) to hide the complexity of data storage systems from users. It contains an implementation-independent interface to store, query and retrieve all kinds of data products. PAL helps users to focus on scientific data processing and analysis. It has become a fundamental component of the Herschel Interactive Processing Environment (HIPE), which is the main application interface for most Herschel users. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： object-oriented databases

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HERMES: A tool for querying heterogeneous data stores

HERMES: A tool for querying heterogeneous data stores

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2012 16th Panhellenic Conference on Informatics, PCI 2012

作者： Keramopoulos, Euclid Dervos, Dimitris Deligiannis, Ignatios Evangelidis, Georgios Pouyioutas, Philippos Dept. of Information Technology Alexander TEI of Thessaloniki Thessaloniki Greece Dept. of Applied Informatics University of Macedonia Thessaloniki Greece Dept. of Computer Science University of Nicosia Nicosia Cyprus

ISBN: (纸本)9780769548258

Data are organized/stored in a plethora of different databases, locations and data models. In many cases, companies and organizations utilize data stored in a variety of data models at remote database servers. A challenge would be to construct queries that join data from such disparate sources. In this paper, we report on research work relating to graphical query languages and data modeling. More specifically, we report on a new software tool for the novice user, one that transforms databases of different data models (Relational, object-Relational, object-oriented) into an equivalent XML model, plus on a new graphical XQuery type query language that facilitates the construction of user queries that join data from different data models. © 2012 IEEE.

关键词： object-oriented databases

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