Incomplete Information and the Functional Data Model

Incomplete Information and the Functional Data Model

This paper presents an experimental functional database language Fudal which is a further development of our group's work on persistent functional database languages. In this latest work we consider how unknown or partially known information can be treated in the functional context. The language we have implemented, Fudal, includes certainty and possibility operators. We outline the problems th...

Functional Dependencies and Incomplete Information

Functional dependencies play an important role in relational database design. They are defined in the context of a single relation which a t all times must contain tuples with non-null entries. In this paper we examine an extension of the functional dependency interpretation t o handle null values, that is, entries in tuples that represent incomplete information in a relational database. A comp...

the effect of functional/notional approach on the proficiency level of efl learners and its evaluation through functional test

in fact, this study focused on the following questions: 1. is there any difference between the effect of functional/notional approach and the structural approaches to language teaching on the proficiency test of efl learners? 2. can a rather innovative language test referred to as "functional test" ge devised so so to measure the proficiency test of efl learners, and thus be as much reliable an...

burden of gastrointestinal cancers and problem of the incomplete information; how to make up the data?

cancer registration is an important source for measuring the burden of cancer in a population. in practice, however, quite frequently incorrect patients are registered or data items can be inaccurately recorded or not recorded at all. also the process or quality of these registrations varies among countries. in this paper, we briefly discussed some statistical techniques including; mortality an...

Image Reconstruction from Incomplete Data