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Clustering techniques are frequently applied in business and economy, for example in customer classification, enterprise grouping and in other economic data analysis. This paper presents a new clustering method, based on Delaunay triangulation and iterative aggregation of points distributed in the feature space. In the first part of the article we propose a clustering algorithm that utilises this concept. The algorithm iteratively connects specially selected pairs of nodes in the triangulation mesh and leads to sy...

The paper considers a problem of gemstones valuation, based on real data. The main goal includes constructing a model that determines the evaluated price of a given stone on the basis of its description, expressed as a set of input variables values. A classic approach, utilising a multiple linear regression tool, is compared with nonlinear multilayer perceptrons. As the dataset contains a number of qualitative variables (e.g. gemstone colour purity, the clarity of the structure and a symbol of the certifying autho...

“Aurel Vlaicu” University of Arad took part in a large scale monitoring study that focused on the university graduates all-over the country. The national study was performed for 18 universities targeting the graduates and their insertion on the labour market. A national database was set-up and data-processing was performed, involving the entire amount of data. After consolidating the results, the central database was split-up and delivered to the universities for their own data-processing and conclusions. This pap...

The paper presents a new, developed by the author, concept of an artificial neural map, named COMSOM and inspired by classic SOM neural networks. The initial part of the article shows a general idea of COMSOM model and its structure, which includes two layers of artificial neurons: input layer (with typical task of distributing input values to data processing neurons) and basic layer containing usually a great number of processing elements, located inside a rectangular part of an XY plane, and able to move freely ...