techniques to discover roles to complement the costly top-down approaches for RBAC system construction. A key problem that has not been adequately addressed by existing role mining approaches is how to discover roles with semantic meanings. In this paper, we study the problem in two settings with different

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Evoked Potentials from electroencephalogram (EEG) recording were averaged to many visually presented word stimuli whose semantic meanings were specified along Osgood’s semantic dimensions of Evaluation, Potency, and Activity [Miron

The Semantic Web Project of W3C is developed at the purpose of extending the current web to make the information automatically processable by software programs. RDF/RDFS, DAML+OIL and the recent OWL are several specifications proposed along this way. However, the proliferation of XML

of relationship this link represents. With the advent of the semantic web, concepts and relationships among them are represented in an ontology. This can be utilized to make links more meaningful. Web pages can be searched, browsed or even reorganized based on their concept and relationship labels. Links in a

I would like to thank Sandra Carberry, my advisor, for her limitless patience and impeccable advice. The hours she spent reviewing my drafts and listening to my half-formed theories over the past year were crucial to my arrival at a final paper of which I am genuinely proud. I would also like to thank Hui Fang, who provided invaluable input on both the theory and implementation of Wikimantic. Together, Sandra and Hui were vital for transforming a simple idea about query expansion into a full-fledged thesis on disambiguation with a strong theoretical backing and working implementation. I would like to thank my family for all the support they have given me and all the things they have taught me. Dad, who showed me how to think analytically and find wonder in the way the world works. Mom, who taught me how to work with words and communicate my thoughts to others. Kevin, whose positive attitude and competitive spirit has taught me the value of challenging myself and learning from failures. They have shaped me in so many ways that this thesis is as much a reflection of them as it is me, and their contribution runs even deeper than the considerable

specification of semantics which have appeared in the literature. A simple technique for specifying the "meaning " of languages defined by context-free grammars is introduced in Section 1 of this paper, and its basic mathematical properties are investigated in Sections 2 and 3. An example which

... structure. As Levin has addressed (Levin 1985), the decomposition of verbs is proposed for the purposes of accounting for systematic semantic-syntactic correspondences. This results in a series of problems for MT systems: inflexible verb sense definitions; difficulty in handling metaphor

We present a system for identifying the semantic relationships, or semantic roles, filled by constituents of a sentence within a semantic frame. Various lexical and syntactic features are derived from parse trees and used to derive statistical classifiers from hand-annotated training data. 1

This article describes the semantics of the language of statecharts as implenented in the STATEMATE system [Harel et al. 1990; Harel and Politi 1996]. The initial version of this semantics was developed by a team about.10 years ago. With the added experience of the users of the system it has since