TY - GEN
T1 - Extending databases to precision-controlled retrieval of qualitative information
AU - De Gyves, Victor Polo
AU - Guzman-Arenas, Adolfo
AU - Levachkine, Serguei
PY - 2005
Y1 - 2005
N2 - A hierarchy is an arrangement of qualitative values in a tree with certain properties. Hierarchies allow to define the confusion conf(r, s) in using qualitative value r instead of the intended or correct value s. From here, "predicate P holds for object o", written P(o), is generalized to "P holds for o within confusion ε", written Pε(o) . These precision-controlled predicates are useful to retrieve approximate answers, where the error (confusion) is known. The predicates are implemented through an extended SQL that uses confusion to retrieve information from a database. We show how to extend any database for precision-controlled retrieval. Limiting the total error is also useful, and this is achieved by predicate Pε. Examples are given.
AB - A hierarchy is an arrangement of qualitative values in a tree with certain properties. Hierarchies allow to define the confusion conf(r, s) in using qualitative value r instead of the intended or correct value s. From here, "predicate P holds for object o", written P(o), is generalized to "P holds for o within confusion ε", written Pε(o) . These precision-controlled predicates are useful to retrieve approximate answers, where the error (confusion) is known. The predicates are implemented through an extended SQL that uses confusion to retrieve information from a database. We show how to extend any database for precision-controlled retrieval. Limiting the total error is also useful, and this is achieved by predicate Pε. Examples are given.
UR - http://www.scopus.com/inward/record.url?scp=33646040447&partnerID=8YFLogxK
U2 - 10.1007/11533962_3
DO - 10.1007/11533962_3
M3 - Contribución a la conferencia
SN - 3540280634
SN - 9783540280637
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 21
EP - 32
BT - Advanced Distributed Systems - 5th International School and Symposium, ISSADS 2005, Revised Selected Papers
PB - Springer Verlag
T2 - Advanced Distributed Systems - 5th International School and Symposium, ISSADS 2005, Revised Selected Papers
Y2 - 24 January 2005 through 28 January 2005
ER -