Browsing by Author "Premarathna, PHSR"

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    Computability in cryptography
    (Department of Computer Science and Engineering, University of Moratuwa., 2012) Iroshan, AKA; Indrajee, KHH; Mahawithana, P; Dharshana, KUGS; Premarathna, PHSR; De Silva, R
    Cryptography is a concept and a methodology for secret communication, which is used and improved thousands of years. Cryptography includes a vast variety of implementation schemes, starting from simple shifting ciphers to DNA algorithms. In this paper we discuss extensively the algorithms behind those cryptographic schemes and the computability aspects of such algorithms. We outline the advantageous factors in computational complexity in such schemes. Also some interesting research being done on this area and problem areas where further research is needed, are outlined.
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    Lexical Enrichment and Sense Disambiguation of Ontology Concepts
    Premarathna, PHSR; Indrajee, KHH; Mahawithana, P; De Silva, LYSG; Wimalasuriya, DC
    This paper presents a model to measure semantic similarity between custom ontology concepts and the taxonomy of WordNet and introduces a new ontology concept similarity measure. The similarity measure is based on a measure of weighted overlap of semantic cotopy of a concept in two taxonomies. The model can be applied to automatically enhance the vocabulary of terms in ontologies embedding equivalence classes of terms and other linguistic information directly in the ontology. This model is applied to the products and services domain where a Product Ontology is lexically enhanced and the effectiveness of the model is evaluated.