In this paper, a parallel retrieving scheme of complex objects' index is described in a objectoriented database framework. We handle complex queries, which include simple queries combined by AND, OR, NOT logical ...
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ISBN:
(纸本)1880843463
In this paper, a parallel retrieving scheme of complex objects' index is described in a objectoriented database framework. We handle complex queries, which include simple queries combined by AND, OR, NOT logical operators. Our scheme employs the multiindexing technique, and complex queries are normalized to avoid the retrieval redundancies. We provide an effective retrieval method combined with incorporated algorithms to detect the set operation termination.
object-oriented database schemas axe often defined by several future users of the planned database, where each user defines a schema representing his/her view on the database;the complete database schema is defined by...
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ISBN:
(纸本)3540666869
object-oriented database schemas axe often defined by several future users of the planned database, where each user defines a schema representing his/her view on the database;the complete database schema is defined by integrating these views in a subsequent step. Behavior of objects is often defined at two levels of detail: at the level of methods and at the level of object life-cycles that represent the overall behavior of objects during their life time. This paper presents an approach to integrate views of object life-cycles to a complete object life-cycle of an object type. We will particularly consider the problem that different users know about parts of the object life-cycle at different levels of detail and often do not consider exactly the same set of entities.
In this paper we present an analysis of requirements for real-time object-oriented database models. The analysis is based on the assumption that in the future, real-time databases will need real-time, object-oriented,...
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ISBN:
(纸本)0818680350
In this paper we present an analysis of requirements for real-time object-oriented database models. The analysis is based on the assumption that in the future, real-time databases will need real-time, object-oriented, distributed, and active database features. We consider the problem of real-time object-oriented database model requirements in three steps. First, we list the aspects that we End important on real-time, object-orientation, distribution, and rule handling. Second, we give a set of features of all of the aspects that should constitute the very core of a real-time object-oriented database model. And third, we give an extended set of features that represents useful extra functionality to the models.
The IDEA Methodology is a comprehensive approach to the design of information systems;its main focus is the use of innovative features of database technology, in particular the object-oriented and rule-based paradigms...
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ISBN:
(纸本)3540631070
The IDEA Methodology is a comprehensive approach to the design of information systems;its main focus is the use of innovative features of database technology, in particular the object-oriented and rule-based paradigms. The development of the IDEA Methodology started three years ago, in the framework of the IDEA Esprit project. The methodology was first conceived in our university, then experienced by several industrial partners of the IDEA Consortium, then consolidated. In the summer of 1997, the IDEA Methodology is widely available through a variety of:media and sufficiently stable to permit us to attempt a critical evaluation of this three-years story. Of course, this is a preliminary evaluation: the methodology will have its most significant assessment after its dissemination and usage, which is currently taking place. In order to set the context for the discussion, the paper introduces the main features of the IDEA Methodology through a case study.
In the context of the object-oriented data model, a compile-time approach is given that provides for a significant reduction of the amount of run-time transaction overhead due to integrity constraint checking. The hig...
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ISBN:
(纸本)3540648232
In the context of the object-oriented data model, a compile-time approach is given that provides for a significant reduction of the amount of run-time transaction overhead due to integrity constraint checking. The higher-order logic Isabelle theorem prover is used to automatically prove which constraints might, or might not be violated by a given transaction in a manner analogous to the one used by Sheard and Stemple (1989) for the relational data model. A prototype transaction verification tool has been implemented, which automates the semantic mappings and generates proof goals for Isabelle. Test results are discussed to illustrate the effectiveness of our approach.
Multidimensional raster data appears in many application areas, typically in the form of sampled spatial or spatio-temporal analogue data. Due to the data volume and correlations between neighbouring samples usually e...
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ISBN:
(纸本)3540425276
Multidimensional raster data appears in many application areas, typically in the form of sampled spatial or spatio-temporal analogue data. Due to the data volume and correlations between neighbouring samples usually encountered in this kind of data it has high potential for efficient compression, as can be seen by the wealth of specialized compression techniques developed for 2D raster images;other examples would be ID time series, 3D volumetric or spatiotemporal data, 4D spatio-temporal data or 5+D data typically found in OLAP data cubes. Efficiently handling this kind of data often requires compression, be it to reduce storage space requirements or transfer times over low-bandwidth media. In this paper we present the design of the generic, tile-based compression engine developed for this purpose and implemented in the multidimensional array DBMS RasDaMan.
This paper presents a novel algorithm: Verfied Partial object Detector (VPOD) for accurate detection of partially occluded objects such as furniture in 3D point clouds. VPOD is implemented and validated on real sensor...
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ISBN:
(纸本)9781467356480;9781467356466
This paper presents a novel algorithm: Verfied Partial object Detector (VPOD) for accurate detection of partially occluded objects such as furniture in 3D point clouds. VPOD is implemented and validated on real sensor data obtained by our robot. It extends Viewpoint Feature Histograms (VFH), which classify unoccluded objects, to also classify partially occluded objects such as furniture that might be seen in typical office environments. To achieve this result, VPOD employs two strategies. First, object models are segmented and the object database is extended to include partial models. Second, once a matching partial object is detected, the complete object model is aligned back into the scene and verified for consistency with the point cloud data. Overall, our approach increases the number of objects found and substantially reduces false positives due to the verification process.
In this paper we present an approach of image retrieval by Content in an objectoriented database. The content of image includes automatically extracted features such as colors, textures, and manually extracted featur...
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ISBN:
(纸本)0818677287
In this paper we present an approach of image retrieval by Content in an objectoriented database. The content of image includes automatically extracted features such as colors, textures, and manually extracted features such as relevant regions, shapes, key words and texts. All these features and their behaviors are represented in an object-oriented database. Finally a KD-tree is used to model the index of features, and to support efficiently the match engine.
In this paper we propose a model of a database that could become a kernel of cooperative database applications. First, we propose a new data model CDM (Collaborative Data Model) that is oriented for the specificity of...
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ISBN:
(纸本)1581131461
In this paper we propose a model of a database that could become a kernel of cooperative database applications. First, we propose a new data model CDM (Collaborative Data Model) that is oriented for the specificity of multiuser environments, in particular: cooperation scenarios, cooperation techniques and cooperation management. Second, we propose to apply to databases supporting collaboration so called multiuser transactions. Multiuser transactions are flat transactions in which, in comparison to classical ACID transactions, the isolation property is relaxed.
We are currently designing a class modification methodology for GemStone. We describe the current status of the design. We choose from two basic approaches and then Introduce those aspects of Gem-Stone necessary for a...
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