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

Computing semantic relatedness of natural language texts requires access to vast amounts of common-sense and domain-specific world knowledge. We propose Explicit Semantic Analysis (ESA), a novel method that represents the meaning of texts in a high-dimensional space of concepts derived from

Abstract-This paper argues that securities English has its own semantic meaning especially nouns, adjectives, adverbs and verbs have their unique semantic meaning that can't be owned by their common words and that it is imperative this linguistic features be grasped in order that this kind

Abstract-The scale-space technique introduced by Witkin involves generating coarser resolution images by convolving the original image with a Gaussian kernel. This approach has a major drawback: it is difficult to obtain accurately the locations of the “semantically mean-ingful ” edges at coarse