Consistent query answering is the problem of computing the answers from a database that are consistent with respect to certain integrity constraints that the database as a whole may fail to satisfy. Those answers are characterized as those that are invariant under minimal forms of restoring the consistency of the database. In this context, we study the problem of repairing databases by fixing i...

AS KNOWLEDGE STORAGE SYStems grow in size and complexity, it becomes unreasonable to expect that users always know enough about the data and how the data are organized to construct accurate and useful queries. Even when a system has syntactic utilities for building queries, users continue to compose queries that contain misconceptions, are too general, or are bound to fail. Cooperative-answerin...

With the rapid development of e-services on the Web, increasing number of e-catalogs are becoming accessible to users. A large number of e-catalogs provide information about similar type of products/services. To simplify users information searching effort, data integration systems have being developed to integrate e-catalogs providing similar type of information such that users can query those ...

Full points may be obtained for correct answers to 8 questions. Each numbered question (which may have several parts) is worth the same number of points. All answers will be graded, but the score for the examination will be the sum of the scores of your best 8 solutions. Use separate answer sheets for each question. DO NOT PUT YOUR NAME ON YOUR ANSWER SHEETS. When you have finished, insert all ...

When data sources are integrated into a single global system, inconsistencies wrt global integrity constraints are likely to occur. In this paper, the notion of consistent answer to a global query in the context of the local-as-view approach to data integration is characterized. Furthermore, a methodology for generating query plans for retrieving consistent answer to global queries is introduce...

The paper discusses the use of a Question and Answer section of a Discussion Board on a computer-mediated web conferencing tool, and the way in which this facility fits with ideas of social learning. A description will be provided of how learning was developed through questions and answers in this subject and insights will be shared regarding the various uses of this facility by the students. I...

t AST month we talked shout training men and about the new Turfgrass Short Course at Penn State which is to be activated this fall. It seems important now to examine another phase ol leaching in the turfgrass field — that of extension service. In effect, it » the university extended to the field It is wholly tax supp o r t e d , operating statewide in countv units with administrative heads loca...

Published by the IEEE Computer Society 0018-9162/11/$26.00 © 2011 IEEE IEEE President-Elect Candidates Address Computer Society Concerns T he I E E E C omp u t e r Society has established a r e p u t a t i o n f o r excellence within the fields of computing. As a component of the IEEE, the Computer Society’s activities parallel those of 38 other IEEE societies and councils serving the computing...

Variable expression is one aspect of the heterogeneity of asthma. We aimed to define a variable pattern, which is relevant in general health epidemiological cohorts. Our objectives were to assess whether: 1) asthma patterns defined using simple asthma questions through repeated measurements could reflect disease variability 2) these patterns may further be classified according to asthma severit...

Sensor networks represent a non traditional source of information, as readings generated by sensors flow continuously, leading to an infinite stream of data. Traditional DBMSs, which are based on an exact and detailed representation of information, are not suitable in this context, as all the information carried by a data stream cannot be stored within a bounded storage space. Thus, compressing...