George Panagopoulos

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BACKGROUND Hypertension leads to many degenerative diseases, the most common being cardiovascular in origin. This study has been designed to estimate the prevalence of self-reported hypertension in a random nationwide sample of adult Greek population, while focus was set to the assessment of participants' nutritional habits in relation to their hypertension(More)
Free text retrieval is an important problem which can signii-cantly beneet from a parallel architecture. Signature methods have been proposed to answer text retrieval queries in parallel machines Sta88, LF92], under the assumption that the main memory is suucient to hold the entire signature le. We propose the use of a Parallel Bit-Sliced Signature File(More)
—This paper presents the first distributed triangle listing algorithm with provable CPU, I/O, Memory, and Network bounds. Finding all triangles (3-cliques) in a graph has numerous applications for density and connectivity metrics, but the majority of existing algorithms for massive graphs are sequential, while distributed versions of algorithms do not(More)
BACKGROUND The strong causal role of hypercholesterolaemia on the progression of atherosclerosis and subsequently on the development of cardiovascular disease is well described. Main aim of this study was to evaluate the prevalence of self-reported hypercholesterolaemia and its relation to nutritional habits, in a representative nationwide sample of adult(More)
Within the field of Computational Creativity, significant effort has been devoted towards identifying variegating aspects of the creative process and constructing appropriate metrics for determining the degree that an artefact exhibits creativity with respect to these aspects. However, the formalization of a person's creativity (i.e. a creativity user(More)
The process of identifying techniques for fostering creativity, and applying these theoretical constructs in real-world educational activities, is, by nature, multifaceted and not straightforward, pertaining to several fields such as cognitive theory and psychology. Furthermore, the quantification of the impact of different activities on creativity is a(More)
Free text retrieval is an important problem which can signii-cantly beneet from a parallel architecture. Signature methods have been proposed to answer text retrieval queries in parallel machines Sta88, LF92], under the assumption that the main memory is suucient to hold the entire signature le. We propose the use of a Parallel Bit-Sliced Signature File(More)
  • Ibrahim M Kamel, Christos Faloutsos, Michael Franklin, Alan Hevner, Nick Roussopoulos, Hanan Samet +15 others
  • 2006
Recently, spatial databases have attracted increasing interest in the database eld. Because of the volume of the data with which they deal with, the performance of spatial database systems' is important. The R-tree is an eecient spatial access method. It is a generalization of the B-tree in multidimensional space. This thesis investigates how to improve the(More)
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