Revista Romana de Interactiune Om-Calculator

23-50

Authors: Maria Roditis, Andreea Tabacariu, Stefan Trausan-Matu

The article presents recommendation systems in terms of the most important aspects and types of algorithms used in different approaches and implementations, as well as issues which arise and need to be overcome. The application presented in this article was developed based on a combination of multiple ways to recommend images. The proposed model brings quality results using the following aspects of recommendation: social - by applying the concept of collaborative filtering, visual - by calculating the similarities between the visual features extracted from images, semantic - using metrics based on WordNet similarity between terms, and also by integrating a SVM classifier for recognition of scene types based on visual aspects. We present in detail the scientific methods and the architectural design used in our proposed system.

65-80

Authors: Costin Pribeanu

Up to now few approaches to usability evaluation exist that are using structural models to analyze the causal relations between various factors influencing the quality of use and / or the intention to use. Also, few measurement models exist that are including composite constructs targeting several dimensions. Adequate specification of measurement models according to the nature of construct and direction of causal relations between a construct and its measures is an important research topic in recent years. In this paper a synthesis of recent advances in formative models specification and validation methodology is presented. The methodology was applied to develop a structural model having as focal variable a composite construct measured with formative indicators. The purpose of this study is to get more insights into specific usability issues and to analyze the relationship between usability and the perceived enjoyment.