Sfoglia per Autore "Vassilakopoulos, M."
Items 1-13 di 13
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Analysis and design of a web-based decision support system for choosing higher education studies
(2014)The vocational orientation of the youngsters who are about to enter, study, or have recently graduated at higher education (HE) institutions, and linking HE with labor market are two research areas which have not been ... -
Ant colony optimization and data mining
(2011)The Ant Colony Optimization (ACO) technique was inspired by the ants' behavior throughout their exploration for food. In nature, ants wander randomly, seeking for food. After succeeding, they return to their nest. During ... -
Ant colony optimization and data mining: Techniques and trends
(2010)The Ant Colony Optimization (ACO) technique was inspired by the ants' behaviour throughout their exploration for food. The use of this technique has been very successful for several problems. Besides, Data Mining (DM) has ... -
Comparison of post-relational and object-relational modelling for real-world database applications
(2014)Purpose – The purpose of this paper is to compare the use of two Object-Relational models against the use of a post-Relational model for a realistic application. Although real-world applications, in most cases, can be ... -
Database design of a geo-environmental information system
(2014)Environmental protection from productive investments becomes a major task for enterprises and constitutes a critical competitiveness factor. The region of Central Greece presents many serious and particular environmental ... -
The deletion operation in xBR-trees
(2012)In order to design a spatial index, the most important operations are: insertion, deletion and search. We focus on the deletion operation over the xBR-tree, a spatial data secondary memory structure that belongs to the ... -
Higher technological education specialties and graduates' vocational status and prospects
(2013)Purpose: The purpose of this paper is to focus on a thorough comparison of the broader specialties and subspecialties provided by Greek higher technological education, regarding the employment status and the vocational ... -
Join-queries between two spatial datasets indexed by a single R*-tree
(2011)A spatial join, a common query in Spatial Databases and Geographical Information Systems (GIS), consists in testing every possible pair of data elements belonging to two spatial datasets against a spatial predicate. This ... -
Nearest Neighbor Algorithms using xBR-Trees
(2011)One of the common queries in spatial databases is the (K) Nearest Neighbor Query that discovers the (K) closest objects to a query object. Processing of spatial queries, in most cases, is accomplished by indexing spatial ... -
A new plane-sweep algorithm for the k-closest-pairs query
(2014)One of the most representative and studied Distance-Based Queries in Spatial Databases is the K-Closest-Pairs Query (KCPQ). This query involves two spatial data sets and a distance function to measure the degree of closeness, ... -
Plane-sweep algorithms for the K Group Nearest-Neighbor Query
(2015)One of the most representative and studied queries in Spatial Databases is the (K) Nearest-Neighbor (NNQ), that discovers the (K) nearest neighbor(s) to a query point. An extension that is important for practical applications ... -
Predictive join processing between regions and moving objects
(2008)The family of R-trees is suitable for indexing various kinds of multidimensional objects. TPR*-trees are R-tree based structures that have been proposed for indexing a moving object database, e.g. a data-base of moving ... -
A software tool for building a statistical prefix processor
(2012)Information Retrieval or Text Classification need to match words between the user's input and the documents in a collection of texts. Matching of words is not a trivial process since words have grammatical (inflectional ...