This article introduces a segmentation method to auto- matically extract object parts from a reduced set of images. Given a database of objects and dividing all of them using local color histograms, we obtain an objec...
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Within organisations, Information Systems are characterised by heterogeneity. The main management tools are different Relational and objectoriented DataBase Management Systems. Therefore, variety, complexity and lack...
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作者：
Yahia, A.Lakhal, L.Cicchetti, R.Bordat, J.P.LIMOS
Complexe Scientifique des Cézeaux 63177 Aubière Cedex France Case 901
Faculté des sciences de Luminy 163 Av. de Luminy 13288 Marseille Cedex9 France LIRMM
161 rue ADA 34392 Montpellier cedex 5 France
This paper proposes a method, called iO2, for building the inheritance graph of an 02 database schema. The iO2 method is based on the Galois lattice data structure. It encompasses three steps: a (first) construction s...
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ISBN:
(纸本)9783540617846
This paper proposes a method, called iO2, for building the inheritance graph of an 02 database schema. The iO2 method is based on the Galois lattice data structure. It encompasses three steps: a (first) construction step, a (second) optimization step, and a (final) generation step. This paper focuses on the two first steps. The construction step builds the Galois graph of the finite binary relation associating properties to entity and relationship types. A new algorithm is proposed for this first step. The optimization step builds the Galois inheritance graph from the Galois graph. A new algorithm is proposed for this second step in order to eliminate the redundancies. The generation step yields the 02 inheritance graph from the Galois inheritance graph. The transformation principles underlying this third step are given. The detailed generation algorithm is presented in [Yah96a].
作者：
Van den Bussche, Jan
Dept. Math. & Comp. Science Universiteitsplein 1 AntwerpB-2610 Belgium
We provide a general framework for declarative selection operations for complex objectdatabases, based on the safe calculus for complex objects. Within this framework, we consider a class of "single pass-evaluab...
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In this paper, we present a framework based on the notion of classes as an organizational tool to model some common concepts in Database. The creation of a simple and representational model helps to reconcile the seem...
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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-...
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Persistent programming is concerned with the construction of large and long lived systems of data [1,2]. Such systems have traditionally required concurrent access for two reasons. The first is that of speed, be it ac...
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Fuzzy data are a common concept in today's information society. Some data can be unknown, other data may be inaccurate or uncertain. Still, this fuzzy data must be accounted for in modern businesses and therefore ...
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ISBN:
(纸本)3540204091
Fuzzy data are a common concept in today's information society. Some data can be unknown, other data may be inaccurate or uncertain. Still, this fuzzy data must be accounted for in modern businesses and therefore must be stored. Fuzzy relational databases have been studied extensively over time, which resulted in numerous models and representation techniques, some of which have been implemented as software layers on top of database systems. Different query languages and end-user interfaces have been extended to perform flexible queries on both regular and fuzzy databases. In this paper, a framework is presented that not only enables flexible querying on the relational model, but on other database models as well, of which the most important are object-oriented database models. This framework, called FQF or Flexible Querying Framework, is built on the recently developed Java Data objects (JDO) standard.
Most objectoriented concurrency control is dedicated to increase method execution concurrency, however they do not consider the inter-object behavior. In this paper we present mechanisms to deal with the communicatio...
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We argue that a fully object-oriented database management system is a very suitable basis of every modern CASE environment. We describe how the features provided by an OODBMS are exploited to build a CASE tool or envi...
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