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2nd Eurographics Workshop on 3D object Retrieval, EG 3DOR 2009

作者： Agathos, A. Pratikakis, I. Papadakis, P. Perantonis, S. Azariadis, P. Sapidis, N. National Center for Scientific Research Demokritos Computational Intelligence Laboratory Institute of Informatics and Telecommunications Agia Paraskevi Athens 15310 Greece Department of Product and Systems Design Engineering University of Aegean Ermoupolis Syros GR-84100 Greece

ISBN: (纸本)9783905674163

Most of the approaches which address the problem of 3D object retrieval, use global descriptors of the objects which fail to consistently compensate for the intra-class variability of articulated objects. In this paper, a retrieval methodology is presented which is based upon a graph-based object representation. This is composed of a meaningful new mesh segmentation along with a graph matching between the graph of the query object and each of the graphs that correspond to the objects of the 3D object database. The graph matching algorithm is based on the Earth Mover's Distance (EMD) similarity measure which is calculated using a new ground distance assignment. The superior performance of the proposed methodology is shown after an extensive experimentation comprising alternative descriptors for the constituent components of the 3D object as well as comparison with state of the art retrieval algorithms. © The Eurographics Association 2009.

关键词： object-oriented databases

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Indoor and urban environmental monitoring using "virtual building" approach

Indoor and urban environmental monitoring using "virtual bui...

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9th International Healthy Buildings Conference and Exhibition, HB 2009

作者： Feng, Wei Zhang, Jensen S. Kato, Shinsuke Khalifa, Ezzat Zhang, Max Ferro, Andrea Hopke, Phil Michel, Myron Syracuse University Syracuse NY United States University of Tokyo Tokyo Japan Cornell University Ithaca NY United States Clarkson University Potsdam NY United States SUNY College of Environmental Science and Forestry Syracuse NY United States

A "Virtual Building (VB)" uses object-oriented Database to store and represent digitally building information in a hierarchical structure. The objective of this study was to use the VB approach to develop a real-time indoor and urban environmental monitoring system. It included a new and expanded primary database structure implemented in a web-based database program, interactive modules between the main database to sub-databases that obtain data directly from various type of sensors/network of sensors, or from the building energy management system. At each level of the primary database structure, different indoor and outdoor monitoring parameters were defined and categorized. The approach was demonstrated in a pilot testbed using an office building. Measurements of temperature, humidity and CO2 at 16 different locations, and indoor VOC concentrations were conducted in the pilot testbed. The monitored data were used to illustrate the dynamics of indoor thermal and air quality conditions as a function of outdoor weather and indoor occupancy conditions.

关键词： object-oriented databases

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Efficient implement of ORM (object/Relational Mapping) use in J2EE framework: Hibernate

Efficient implement of ORM (Object/Relational Mapping) use i...

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2009 International Conference on Computational Intelligence and Software Engineering, CiSE 2009

作者： Xia, Chuanlong Yu, Guangcan Tang, Meng International School of Software Wuhan University Wuhan 430079 China School of Information Management Wuhan University Wuhan 430072 China

ISBN: (纸本)9781424445073

object-relational mapping (ORM) in computer software is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages. ORM technologies mediates between object oriented architecture system and relational environment;it is a solution for paradigm mismatch. This creates, in effect, a "virtual object database" that can be used from within the programming language. There are both free and commercial packages available that perform object-relational mapping, although some programmers opt to create their own ORM tools. The ORM approach was first realized in Hibernate, an open source project for Java systems started in 2002, which will be introduced here. ©2009 IEEE.

关键词： object-oriented databases

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Anonymizing moving objects: How to hide a MOB in a crowd? 09

Anonymizing moving objects: How to hide a MOB in a crowd?

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12th International Conference on Extending Database Technology: Advances in Database Technology, EDBT'09

作者： Yarovoy, Roman Bonchi, Francesco Lakshmanan, Laks V.S. Wang, Wendy Hui University of British Columbia Vancouver BC Canada Yahoo Research Barcelona Spain Stevens Institute of Technology Hoboken NJ United States

ISBN: (纸本)9781605584225

Moving object databases (MOD) have gained much interest in recent years due to the advances in mobile communications and positioning technologies. Study of MOD can reveal useful information (e.g., traffic patterns and congestion trends) that can be used in applications for the common benefit. In order to mine and/or analyze the data, MOD must be published, which can pose a threat to the location privacy of a user. Indeed, based on prior knowledge of a user's location at several time points, an attacker can potentially associate that user to a specific moving object (MOB) in the published database and learn her position information at other time points. In this paper, we study the problem of privacy-preserving publishing of moving object database. Unlike in microdata, we argue that in MOD, there does not exist a fixed set of quasi-identifier (QID) attributes for all the MOBs. Consequently the anonymization groups of MOBs (i.e., the sets of other MOBs within which to hide) may not be disjoint. Thus, there may exist MOBs that can be identified explicitly by combining different anonymization groups. We illustrate the pitfalls of simple adaptations of classical fc-anonymity and develop a notion which we prove is robust against privacy attacks. We propose two approaches, namely extreme-union and symmetric anonymization, to build anonymization groups that provably satisfy our proposed fc-anonymity requirement, as well as yield low information loss. We ran an extensive set of experiments on large real-world and synthetic datasets of vehicular traffic. Our results demonstrate the effectiveness of our approach. Copyright 2009 ACM.

关键词： object-oriented databases

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The influence of optimisations on the performance of an object relational mapping tool

The influence of optimisations on the performance of an obje...

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Annual Research Conference of the South African Institute of Computer Scientists and Information Technologists, SAICSIT 2009

作者： Van Zyl, Pieter Kourie, Derrick G. Coetzee, Louis Boake, Andrew Espresso Research Group Meraka PO Box 395 Pretoria 0001 South Africa Espresso Research Group Department of Computer Science University of Pretoria Pretoria 0002 South Africa Meraka Institute PO Box 395 Pretoria 0001 South Africa

ISBN: (纸本)9781605586434

object Relational Mapping (ORM or also known as O-R) tools provide a mapping between the object model and the relational model, acting as an intermediary between an object oriented code base, and a relational database. Over the last few years the use of object relational mapping tools have grown. Today their exist many ORM tools for programming languages, like C++ (LiteSQL), Java (Hibernate, Apache OJB), Python (SQLAlchemy), Ruby, PHP, .Net (iBATIS) and Perl to name a few. ORM tools provide an extra layer between the business logic layer and the data layer. It is important that this layer is not a bottleneck. The aim of the study was to investigate the influence of this extra layer against the use of object databases that remove the need for this extra mapping layer. During this investigation the impact of certain optimisation techniques on performance was investigated. In this paper we only report on how vendor-recommended optimisation techniques influenced the performance of Hibernate. The OO7 benchmark, tailored to investigate Java based object persistence, was used to create a database;to traverse it;to query it;and to delete and update data. An initial experiment used "out of the box" Hibernate settings with regard to the use of indexes, lazy and eager loading, and caching. The times taken were submitted to Hibernate for comment. The experiment was then re-run, using optimised settings as recommended by the vendor. The extent of improvement is reported. Copyright 2009 ACM.

关键词： object-oriented databases

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Different levels of centralized engineering database strategies for integrated development

Different levels of centralized engineering database strateg...

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19th Annual International Symposium of the International Council on Systems Engineering, INCOSE 2009

作者： Eckl, Carolin Brandstätter, Markus Berner and Mattner Systemtechnik GmbH Erwin-von-Kreibig-Str. 3 D-80807 München Germany Lehrstuhl für Raumfahrttechnik Technische UniversitŠt München Boltzmannstraße 15 D-85748 Garching Germany

ISBN: (纸本)9781615674398

The development of large and complex products is currently carried out in small, separate teams of engineers trained in diverse disciplines. Mechanical and electrical engineers are involved in the development of high-tech and embedded systems as well as software designers. This diversity of disciplines interferes with the efficiency of communication, which is usually carried out in (informal) discussions and by passing documents and models. Within this paper, the passing of documents is explained and enhanced in several levels. Solutions, which are currently available (such as tool chains) are discussed as well as approaches that rest upon a central, document- and object-oriented database. The most elaborate database strategy presented uses similarity relations between documents to infer semantic meaning and facilitate the access to meaningful and relevant development data. This paper concludes with the description of development processes that are introduced with the use of this database solution. © 2009 by Carolin Eckl and Markus Brandstätter.

关键词： object-oriented databases

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Schemaless XML document management in object-oriented databases

Schemaless XML document management in object-oriented databa...

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International Conference on Information Technology - Coding and Computing

作者： Chung, SM Jesurajaiah, SB Wright State Univ Dept Comp Sci & Engn Dayton OH 45435 USA

ISBN: (纸本)0769523153

XML has emerged as the universal format for data exchange and is being widely used in technical documentation of manufacturing companies, book publishing, and Web publishing. It is also being used in contexts that are mission-critical, such as banking and e-commerce. One of the main reasons for the popularity of XML is its semi-structured nature and the flexibility of its component parts. Schemaless XML documents, which do not have a schema or Document Type Definition (DTD), have the highest level of flexibility, as they are not bound to any kind of structure. However, support for schemaless XML documents in the major relational and object-oriented databases is limited to storing each of them as a CLOB (Character Large object). This kind of storage requires the usage of associative search criteria to query the document, and does not support piecewise update and multiple document queries. In this research, we developed a middleware layer over an Oracle DBMS to support the storage, retrieval, query and update of schemaless XML documents. We also propose an algorithm by which we can store the logical structure of the XML document in addition to storing its content. The final part of this paper presents an algorithm that can rebuild XML documents by using the stored logical structures and the content of the XML documents. The rebuilt XML document is a well-formed document and is similar to the original document.

关键词： XML object-oriented databases retrieval query piecewise update document storage and retrieval

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Improving performance in integrated DSS with object oriented modeling

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WSEAS Transactions on Computers 2009年第4期8卷 599-609页

作者： Bâra, Adela Diaconita, Vlad Lungu, Ion Velicanu, Manole Faculty of Economics Cybernetics Statistics and Informatics Academy of Economic Studies Bucharest Romania

The development cycle of a decision support system involves many resources, time and high cost and above all, the database schema used in the system is built only for some specific tasks. So, a relational database schema or a data warehouse prototype cannot be easily mapped and reused in multiple DSS projects. In this paper we propose an object-oriented (OO) approach and an OO database schema to accomplish the DSS implementation which require a multidimensional modeling at the conceptual level using fundamental concepts of OO (class, attribute, method, object, polymorphism, inheritance, hierarchy) to represent all multidimensional properties of a data warehouse, at both the structural and dynamic levels.

关键词： object-oriented databases

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8.3.3 Different Levels of Centralized Engineering Database Strategies for Integrated Development

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INCOSE International Symposium 2009年第1期19卷 1334-1348页

作者： Eckl, Carolin Brandstätter, Markus Berner & Mattner Systemtechnik GmbH Erwin-von-Kreibig-Str. 3 MünchenD-80807 Germany Lehrstuhl für Raumfahrttechnik Technische Universität Boltzmannstraße 15 D-85748 Garching München Germany

关键词： object-oriented databases

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A neurofuzzy approach to active learning based annotation propagation for 3D object databases

A neurofuzzy approach to active learning based annotation pr...

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1st Eurographics Workshop on 3D object Retrieval, EG 3DOR 2008

作者： Lazaridis, Michalis Daras, Petros Centre for Research and Technology Hellas Informatics and Telematics Institute PO BOX 60361 Thessaloniki GR 57001 Greece

ISBN: (纸本)9783905674057

Most existing Content-based Information Retrieval (CBIR) systems using semantic annotation, either annotate all the objects in a database (full annotation) or a manually selected subset (partial annotation) in order to increase the system's performance. As databases become larger, the manual effort needed for full annotation becomes un-affordable. In this paper, a fully automatic framework for partial annotation and annotation propagation, applied to 3D content, is presented. A part of the available 3D objects is automatically selected for manually annotation, based on their "information content". For the non-annotated objects, the annotation is automatically propagated using a neurofuzzy model, which is trained during the manual annotation process and takes into account the information hidden into the already annotated objects. Experimental results show that the proposed method is effective, fast and robust to outliers. The framework can be seen as another step towards bridging the semantic gap between low-level geometric characteristics (content) and intuitive semantics (context). © The Eurographics Association 2008.

关键词： object-oriented databases

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