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In this paper we show a procedure to build automatically an ontology from a corpus of text documents without external help such as dictionaries or thesauri. The method proposed finds relevant concepts in the form of multi-words in the corpus…

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This paper proposes an improved watermarking algorithm based on DCT (Discrete Cosine Transform). We carried out the algorithm as described as follows. First, we extended both rows and ranks of the watermark by using the proposed method before the embedding…

Instars III-V of Nabis (Tropiconabis) capsiformis Germar are described and illustrated, based on specimens from La Pampa, Argentina (new record).

Research on learning processes has shown that students tend to learn in different ways and prefer to use different teaching resources. The understanding of learning styles can be used to identify, and implement, better teaching and learning strategies, in order…

This paper introduces a full description of a software development platform involving libraries that allow the creation of software packages focused not only on industrial applications, but also on applications where design, modeling and/or on-line simulation are required. The flexibility…

In this paper a theoretical study on conjugated heat transfer (natural convection, radiation and conduction) in a square room (cavity) with turbulent flow is presented, taking into account variation on the opaque wall emissivity. The room is formed by an…

Passive optical networks (PONs) represent a promising solution for modern access telecommunication networks. These networks are able to meet the increasing demands on transmission rate for demanding multimedia services, while they can offer typical shared transmission speed of 1.25 or…