A multidatabase system is built upon a number of existing database systems. It requires an interface to allow users to access global heterogeneous information within a reconciled platform as well as to maintain the data consistence and integrity among existing database systems. As a result, a higher level semantic global database schema is needed. The global schema is a single schema derived fr...

Since Chen’s Entity-Relationship (ER) model, conceptual modeling has been playing a fundamental role in relational data design. In this paper we consider an extended ER (EER) model enriched with cardinality constraints, disjointness assertions, and is-a relations among both entities and relationships. In this setting, we consider the case of incomplete data, which is likely to occur, for instan...

School is an environment which brings out students’ hidden talents. Paying attention to an appropriate context and environment has a huge impact on achieving this goal. The purpose of this study was to determine and evaluate semantic factors provided by experts influence students’ sense of belonging at high school students in terms of Iranian experts. To this end, firstly data were collected th...

Kerrick (1956) found no relationship between anxiety as measured by the Taylor Manifest Anxiety scale (Taylor, 19S3) and discrimination among concepts on the semantic differential (Osgood, Suci, & Tannenbaum, 1957). He found a positive relationship between intelligence and discrimination. On the other hand, Ware (as reported by Osgood, 1962) and Brod, Kernoff, and Terwilliger (1964) found no re...

• To what extent are semantic tagsets language-specific? • What should be the relationship between lexicai meanings of the language and semantic tags? • Are semantic tags necessarily hierarchically organized? If so, what should tag hierarchies look like? • What are the main methodologies available for the construction of semantic tagsets? • Can semantic tagsets, which are language-specific, be ...

A semantic relationship is a data modeling construct that connects a pair of classes or categories and has inherent constraints and other functionalities that precisely reflect the characteristics of the specific relationship in an application domain. Examples of semantic relationships include part-whole, ownership, materialization, and role-of. Such relationships are important in the construct...

In this paper, we motivate and present a data model for conceptual design of structural and behavioural aspects of databases. We follow an object centered design paradigm in the spirit of semantic data models. The speciication of structural aspects is divided into modelling of object structures and modelling of data types used for describing object properties. The speciication of object structu...

Engels, G., M. Gogolla, U. Hohenstein, K. Hiilsmann, P. L6hr-Richter, G. Saake, and H.-D. Ehrich, Conceptual modelling of database applications using an extended ER model, Data & Knowledge Engineering 9 (1992/93) 157-204. In this paper, we motivate and present a data model for conceptual design of structural and behavioural aspects of databases. We follow an object centered design paradigm in t...

A novel cross-media retrieval methodology is proposed to help user more accurately and naturally describe their requirement and gain response. The first problem to be solved in this paper is how to build the bridge among heterogeneous information. An efficient approach is adopted to mine the semantic relationship among different multimedia data. We propose the scheme, called cross-media semanti...