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3rd IEEE World Conference on Complex Systems (WCCS)

作者： Gamal, Mayar Mostafa Ahmed, Abd El-Aziz Hefny, Hesham Ahmed El-Moneim, Mahmood Abd Cairo Univ Inst Stat Studies & Res Cairo Egypt

ISBN: (纸本)9781467396691

The main contribution of this paper is to present a survey of different approaches and techniques that map fuzzy XML schemas to fuzzy relational databases or fuzzy object oriented databases. Moreover, it presents different fuzzy models and XML data models. In addition, the integration process of fuzzy techniques in different databases has been discussed among several categories of data modeling and querying. This survey will support the future research and development work as well as raising the awareness for the presented approaches.

关键词： fuzzy XML schema Relational databases fuzzy DTD reengineering object oriented databases

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Authorization in object oriented databases 4th

Authorization in object oriented databases

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4th Australasian Conference on Information Security and Privacy (ACISP 99)

作者： Bai, Y Varadharajan, V Univ Western Sydney Sch Comp & Informat Technol Sydney NSW Australia

ISBN: (纸本)3540657568

Formal specification on authorization in object oriented databases is becoming increasingly significant. However most of the work in this field suffers a lack of formal logic semantics to characterize different types of inheritance properties of authorization policies among complex data objects. In this paper, we propose a logic formalization specify object oriented databases together with authorization policies. Our formalization has a high level language structure to specify object oriented databases and allows various types of authorizations to be associated with.

关键词： object oriented databases inheritance security authorization policy formal specification

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A Pattern for the Effective Use of object oriented databases

A Pattern for the Effective Use of Object Oriented Databases

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3rd International Conference on Information and Communication Technologies

作者： Ubaid, Muhammad Atique, Nauman Begum, Saira Mohammad Ali Jinnah Univ PECHS 22-E Block 6 Karachi Pakistan Infini Log Pvt Ltd Karachi Pakistan

ISBN: (纸本)9781424446087

In object oriented scenario, inheritance is a process to make new classes by using classes that have already been defined. Inheritance helps to reuse existing code, by adding together of properties will enhance all new child objects without interfering with their existing ties. In object-oriented programming, an object is instance of class that consists of data and the methods, allows binding for them and operate on that data, stored in the memory of a running application. This paper presents a methodology of class hierarchy with the normalization in object oriented databases. CHNF (Class Hierarchy Normal Form) is good concept for implementing the normalization in class schema. The dilemma is that CHNF has not defined the levels for depth of inheritance;it is possible that CHNF base architecture invalidate the depth of Inheritance and other metrics, which is defined by CK Metrics(1). As the database expends, heavy objects become complicated to handle. Although the more deep hierarchy tree implies that we have good reuse of code but it sound awful effects on memory and performance. For avoiding the heavy objects we have discovered a pattern CHNFP (Class Hierarchy Normal Form Pattern). It follows the concept of CHNF as well as it validates the CK Metrics(1).

关键词： object oriented databases Inheritance Normalization Design Pattern object Relational Mapping Virtual Proxy

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A graphical language for defining views in object oriented databases

A graphical language for defining views in object oriented d...

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ACS/IEEE International Conference on Computer Systems and Applications

作者： M. Sayah A. Flory E. Choueiri Faculty of Sciences 11 Lebanese University Fanar Lebanon LIS1-INSA de Lynn Villeurbanne France Faculty of Economics and Business Administration 11 Lebanese University Lebanon

Summary form only given. Within the framework of an object oriented database graphical query environment for casual end users, a view definition mechanism conceived for users who are expert in their application domain, but not necessarily computer specialists, is proposed. In this mechanism, the focus is on the strength of the graphical view definition language and on the conviviality of the user interface. The view definition language offers adaptation operations to the work context and restructuring operations on both attributes and classes that take into consideration the structure's nesting and inheritance of the database classes. The user interface conviviality is based on the graphical visualization of the portion of the database schema that represents the domain of interest for a user group, and on the use of the graphical language for view definition. To eliminate crossings between different links of the visualized composition hierarchy, a method for graphical visualization is introduced.

关键词： object oriented databases Visualization User interfaces Visual databases Environmental economics Application software

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object-oriented databases - DESIGN AND IMPLEMENTATION

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PROCEEDINGS OF THE IEEE 1991年第1期79卷 42-64页

作者： JOSEPH, JV THATTE, SM THOMPSON, CW WELLS, DL Information Technologies Laboratory Texas Instruments Inc. Dallas TX USA

object-oriented database systems aim at meeting the data modeling, performance, cooperative design, and version management requirements of next-generation applications, such as CAD, CAM, CASE, hypermedia, and expert systems. These needs cannot be met with conventional database systems, which have been developed primarily for business and financial applications. object-oriented database (OODB) systems represent the confluence of ideas from object-oriented programming languages and database management. The paper presents key features of OODB's, provides a taxonomy of approaches to OODB's, and discusses key OODB architectural and implementation issues, design alternatives, and tradeoffs. It provides a brief summary of a variety of OODB systems, both research prototypes and commercial systems. Finally, it discusses industry efforts to accelerate a consensus that can lead to standards in the OODB area.

关键词： object oriented databases Spatial databases Database systems object oriented modeling Design automation Computer aided manufacturing CADCAM Computer aided software engineering Expert systems Taxonomy

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Typicality based on soft aggregations in crisp object oriented databases

Typicality based on soft aggregations in crisp object orient...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： G. Bordogna G. Pasi CNR Istituto per le Tecnologie Informatiche Mutimediali Milano Italy

A method to automatically compute typical objects for a crisp object oriented database is proposed, in which typical objects are regarded as representatives of a fuzzy majority of the stored objects. A vector space model is adopted in which the object instances of a class are represented by vectors. The typical object of a class is derived as the "closest" vector to the fuzzy majority of the instance vectors. The use of typical objects is investigated to support the computation of default values in case of null values, to provide a means for database summarization and fuzzification.

关键词： object oriented databases object oriented modeling Data models Relational databases Fuzzy set theory Content management Information management Soil Decision making Null value

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Dynamic relationships and their propagation attributes in object oriented databases

Dynamic relationships and their propagation attributes in ob...

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International Workshop on Database and Expert Systems Applications

作者： A. Sapir E. Gudes Department of Mathematics and Computer sciences Ben-Gurion University of the Negev Beersheba Israel

object-oriented databases is an emerging technology which can be used to model complex and dynamic applications. Its rich semantics enables the definition of various relationships among objects. Sharing levels and composition types necessitate the definition of whether, and to which extent, should a composed object propagate a message it receives, to its composing objects (propagation rules). Current solutions refer to a system with stable connections, so propagation values can be set at the design stage. The information system described here contains complex relations among objects. These relations can vary on a daily basis. The paper examines the various update operations from relations creation point of view, and suggests an approach for defining these new relations and updating the propagation values dynamically. Thus, the system maintains a behavior that reflects the changing nature of relations.

关键词： object oriented databases

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Classification Rule Mining for object oriented databases: A Brief Review

Classification Rule Mining for Object Oriented Databases: A ...

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International Conference on Computational Intelligence, Communication Systems and Networks, CICSYN

作者： Ajita Satheesh D.K. Mishra Ravindra Patel RGPV UIT Bhopal Madhya Pradesh India AITR Indore Madhya Pradesh India

Data mining is the discovery of knowledge and useful information from the data stored in large databases. The classification of large data sets is an important problem in data mining. Most data mining algorithms cannot be applied to complex object databases unless it is converted into a single flat table. Much valuable information especially the linkages between objects could be lost by conversion of such databases into a single table. As object-oriented data models embody rich data structures and semantics in the construction of complex databases, such as complex data objects, class hierarchies, property inheritance and methods, etc. So it is important to extend the area of study from relational database systems to object-oriented database systems and investigate the mechanisms for knowledge discovery in object-oriented databases. This paper presents a brief review of some of the significant researches available in the literature for object-oriented data mining.

关键词： object oriented databases Data mining Relational databases Data analysis Predictive models Pattern analysis Association rules Road transportation Classification tree analysis Computational intelligence

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Access Specifiers Model for Data Security in object oriented databases

Access Specifiers Model for Data Security in Object Oriented...

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International Conference on Information Technology: New Generations (ITNG)

作者： Mansaf Alam Department of Computer Science Jamia Millia Islamia University New Delhi India

This paper presents a security model for object oriented databases. The approach involves the introduction of several security concerns in object oriented databases. The access specifiers concept of object oriented programming is used in object oriented databases for security of data. This approach secures the data at physical level as well as at conceptual level. In this model three access specifiers public, private and protected are used to secure the data from unauthorized access.

关键词： object oriented databases object oriented modeling Data models Authorization Data security

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A literature survey on mapping between fuzzy XML databases and relational or object oriented databases

A literature survey on mapping between fuzzy XML databases a...

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World Conference on Complex Systems (WCCS)

作者： Mayar Mostafa Gamal Abd El-Aziz Ahmed Hesham Ahmed Hefny Mahmood Abd El-Moneim Institute of Statistical Studies and Research Cairo University Cairo Egypt

关键词： XML object oriented modeling Data models object oriented databases Relational databases Query processing

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