GeneClinics is an online genetic information resource consisting of descriptions of specific inherited disorders ("disease profiles") as well as information on the role of genetic testing in the diagnosis, m...
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GeneClinics is an online genetic information resource consisting of descriptions of specific inherited disorders ("disease profiles") as well as information on the role of genetic testing in the diagnosis, management, and genetic counseling of patients with these inherited conditions. GeneClinics is intended to promote the use of genetic services in medical care and personal decision making by providing health care practitioners and patients with information on genetic testing for specific inherited disorders. GeneClinics is implemented as an object-oriented database containing a combination of data and semistructured text that is rendered as HTML for publishing a given "disease profile" on the Web. Content is acquired from authors via templates, converted to an XML document reflecting the underlying database schema (with tagging of embedded data), and then loaded into the database and subjected to peer review. The initial implementation of a production system and the first phase of population of the GeneClinics database content are complete. Further expansion of the content to cover more disease, significant scaling up of rate of content creation, and evaluation redesign are under way. The ultimate goal is to have an entry in GeneClinics for each entry in the GeneTests directory of medical genetics laboratories-that is, for each disease for which clinical genetic testing is available.
Effective database applications, business rules management, data warehousing, enterprise modeling and re-engineering all depend on the quality of the underlying data model. To properly exploit relational, object-relat...
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ISBN:
(纸本)3540410724
Effective database applications, business rules management, data warehousing, enterprise modeling and re-engineering all depend on the quality of the underlying data model. To properly exploit relational, object-relational or object database technology, a clear understanding is needed as to how to create conceptual business models, transform them to logical database models for implementation on the chosen platform, and query the populated models. Fact-orientation provides a truly conceptual way to accomplish these tasks, facilitating communication between the modeler, the domain expert and the application. This presentation provides insights into the fact-oriented approach for modeling and querying information systems, focusing on verbalization and instantiation of data use cases for capturing business rules, including recent work on negative and default rule verbalizations.
The object-oriented database management system has great promise as a future database technology because of its superior complex data structure manipulation, rich class structure, integration potential, and data reusa...
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In this paper, a locking-based concurrency control scheme is presented for object-oriented databases (OODBs). It is designed for controlling accesses to class hierarchies, which is an important concept in OODBs. Based...
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ISBN:
(纸本)3540676279
In this paper, a locking-based concurrency control scheme is presented for object-oriented databases (OODBs). It is designed for controlling accesses to class hierarchies, which is an important concept in OODBs. Based on access frequency of each class, the proposed scheme incurs less locking overhead than the existing works, explicit locking and implicit locking, for any OODB environments. This paper also proves that the proposed scheme performs better than the existing schemes.
In this paper we present an algorithm which automatically discovers potential semantic object structures in a relation, which may be in non-2NF. This algorithm can be utilised in reverse engineering of relational sche...
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ISBN:
(纸本)3540411844
In this paper we present an algorithm which automatically discovers potential semantic object structures in a relation, which may be in non-2NF. This algorithm can be utilised in reverse engineering of relational schemas, data migration from relational to object database systems and database integration. The algorithm has been implemented, and we report on issues arising from this implementation including optimization techniques incorporated.
In this paper we introduce inheritance in deductive objectdatabases and define an operator for hierarchically composing deductive objects with state evolution capabilities. Evolution of such objects models the expect...
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ISBN:
(纸本)354067201X
In this paper we introduce inheritance in deductive objectdatabases and define an operator for hierarchically composing deductive objects with state evolution capabilities. Evolution of such objects models the expected transactional behavior while preserving many important features of deductive databases. Deductive objects can be organized in ISA schemas where each object may inherit or redefine the rules defined in other objects. The resulting inheritance mechanism handles both the deductive and the update/transactional issues. Our framework accommodates several types of inheritance such as overriding, extension, and refinement. Besides presenting the language, this paper defines its semantics and provides a description of the interpreter for the language that has been implemented.
Although several object-oriented distributed systems development tools exist, there is little, if none, over of solutions that homogeneously integrate all aspects of a distributed system. This article describes a tool...
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ISBN:
(纸本)0769508103
Although several object-oriented distributed systems development tools exist, there is little, if none, over of solutions that homogeneously integrate all aspects of a distributed system. This article describes a toolkit that aims at supporting the construction and the execution of distributed systems. The tools are defined according to an architecture that fully complies with object-oriented principles, providing software developers with a relatively simple - yet effective and efficient - platform that makes it transparent the main difficulties normally found in distributed systems development. Among those difficulties, it is the notorious impedance mismatch between programming language and object manipulation language. Such difficult is not noticed in the toolkit here presented. Moreover, all the benefits from object orientation are deeply exploited. For this reason, the toolkit permits fast development of distributed systems.
Graph data is an emerging model for representing a variety of database contexts ranging from object-oriented databases to hypertext data. Also many of the recursive queries that arise in relational databases are, in p...
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ISBN:
(纸本)3540672273
Graph data is an emerging model for representing a variety of database contexts ranging from object-oriented databases to hypertext data. Also many of the recursive queries that arise in relational databases are, in practice, graph traversals. In this paper we present a language for searching graph-like databases. The language permits us to express paths in a graph by means of extended regular expressions. The proposed extension is based on the introduction of constructs which permit us i) to define a partial order on the paths used to search the graph and, consequently, on the answers of queries, and ii) to cut off, nondeterministically, tuples with low priority. We present an algebra for partially ordered relations and an algorithm for the computation of path queries. Finally, we present applications to hypertext databases such as the Web.
Relationships have been repeatedly identified as an important object-oriented modeling construct. Today most emerging modeling standards such as the ODMG object model and UML have some support for relationships. Howev...
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Corollary to the development of new kinds of application - like decision support ones - manipulating large quantities of data structured in new kinds of data supports -like data warehouses, queries formulated to acces...
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ISBN:
(纸本)3540410724
Corollary to the development of new kinds of application - like decision support ones - manipulating large quantities of data structured in new kinds of data supports -like data warehouses, queries formulated to access this data have been growing in their complexity. However, with the exception of approaches facilitating syntax problems, there is a noticeable absence of models taking charge of the user through from specification of their needs to formulation of their queries. In the case of object-oriented database systems, whose data models and concepts are more complex than those of relational databases, database users need assistance with several kind of formulation problems. In this article, we take a novel look at object-oriented queries - reifying the ones which users formulate as components then reusing them, by means of strategies for selecting, assembling and adapting them to help in the formulation of new complex queries.
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