A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for database design. An example of database design and description using the model

Dependency knowledge of the form "x is independent of y once z is known" invariably obeys the four graphoid axioms, examples include probabilistic and database dependencies. Often, such knowledge can be represented efficiently with graphical structures such as undirected graphs

and semantic data modeling concepts. Rabitti, Woelk, and Kim [141 presented a preliminary model of authorization for use as the basis of an authorization mecha-nism in such database systems. In this paper we present a fuller model of authorization that fills a few major gaps that the conventional models

. Integra-tion involves extracting semantics, expressing them as metadata, and matching semantically equivalent data elements. We present a proce-dure using a classifier to categorize attributes according to their field specifications and data values, then train a neural network to recog-nize similar attributes

Many problems encountered when building applications of database systems involve the manipulation of models. By “model, ” we mean a complex structure that represents a design artifact, such as a relational schema, object-oriented interface, UML model, XML DTD, web-site schema, semantic network

applies to any system which provides a communication infrastructure (existing websites or databases, decentralized systems, P2P systems) and offers the opportunity to study semantic interoperability as a global phenomenon in a network of information sharing parties.

-conceptual relationships into account. Our experiments using a large video database consisting of clips from several movies and based on a set of five semantic concepts reveal a significant improvement in detection performance by over 22%. We also show how the multinet is extended to take temporal correlation into account

investments, using a comprehensive sample of U.S. based VCs over the period 1980 to 2003. VC funds whose parent firms enjoy more influential network positions have significantly better performance, as measured by the proportion of portfolio company investments that are successfully exited through an initial

Abstract. Semantic Web languages are being used to represent, encode and exchange semantic data in many contexts beyond the Web – in databases, multiagent systems, mobile computing, and ad hoc networking environments. The core paradigm, however, remains what we call the Web aspect of the Semantic

cation of current processes of social transformation, thus providing theoretical meaning to the ideal type of the network society. I hope the reader will be benevolent enough to use what s/he nds useful in this effort, and discard the rest. I also hope that we all end up adopting the notion of disposable