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Ghaderi M.,Ramon Llull University | Ruiz F.J.,Barcelonatech | Agell N.,Ramon Llull University
Frontiers in Artificial Intelligence and Applications | Year: 2014

In this paper we explore the possibility of capturing color trends and understanding the rationale behind the popularity of a color. To this end, we propose using a preference disaggregation approach from the field of Multi-Criteria Decision Analysis. The main objective is to identify the criteria aggregation model that underlies the global preference of a color. We introduce a new disaggregation method based on the well-known UTASTAR algorithm able to represent preferences by means of non-monotonic utility functions. The method is applied to a large database of ranked colors, from three different years, based on the information published on the webpage of an international creative community. Non-monotone marginal utility functions from each of the coordinates are obtained for each year. These functions contain the color preference information captured, in an understandable way.

Ghaderi M.,Ramon Llull University | Ruiz F.,Barcelonatech | Agell N.,Ramon Llull University
Pattern Recognition Letters | Year: 2015

What is the role that colour plays in perception of a brand by customers? How can we explore the cognitive role that colour plays in determining brand perception? To answer these questions we propose a preference disaggregation method based on multi-criteria decision aid. We identify the criteria aggregation model that underlies the global preference of a brand with respect to each brand image attribute. The proposed method is inspired by the well-known UTASTAR algorithm, but unlike the original formulation, it represents preferences by means of non-monotonic value functions. The method is applied to a database of brands ranked on each brand image attribute. For each brand image attribute, non-monotonic marginal value functions from each component of the brand colour are obtained separately. These functions contain the fitness between each colour component and each brand image attribute, in an understandable manner. © 2015 Published by Elsevier B.V.

Nguyen P.-L.,Loughborough University | Zhong Q.-C.,Loughborough University | Blaabjerg F.,University of Aalborg | Guerrero J.M.,Barcelonatech
Proceedings of the 2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012 | Year: 2012

The operating principles of static synchronous condenser (STATCOM) are similar to that of a rotating synchronous condenser. However, so far, most controlling methods proposed for STATCOM have not taken into account the internal characteristics of rotational synchronous machines. In this paper, following the idea of synchronverters, the controller for a STATCOM is designed according to the mathematical model of synchronous generators that are operated in the compensator mode. As a result, no phase-locked loop (PLL) is needed. Moreover, a third operation mode, i.e. the droop control mode (or the D-mode in short), is introduced to the operation of STATCOM, in addition to the conventional voltage regulation mode (or the V -mode in short) and the direct Q control mode (or the Q-mode in short). This allows parallel-operated STATCOMs to share reactive power properly. The proposed control strategy is verified with simulations in MATLAB/Simulink/SimPowerSystems. © 2012 IEEE.

Ruiz F.,Barcelonatech | Sama A.,Barcelonatech | Agell N.,ESADE URL
Frontiers in Artificial Intelligence and Applications | Year: 2012

Action learning is a methodology based on a machine learning system that makes it possible to select a suitable action or sequence of actions given a state. The main drawback of this methodology is the difficulty of assigning a class to the state-action pair to be included in the training set. This paper proposes an active learning methodology in the learning phase of an action learning process. With the help of an artificial example, the active methodology is compared with a passive methodology consisting of randomly selecting the training set from the pool of unlabelled patterns. © 2012 The authors and IOS Press. All rights reserved.

Ruiz F.J.,Barcelonatech | Raya C.,Barcelonatech | Sama A.,Barcelonatech | Agell N.,Ramon Llull University
Frontiers in Artificial Intelligence and Applications | Year: 2014

In this paper, a new formulation of the central ideas of the well-established theory of Boden about creativity is presented. This new formulation redefines some terms and reviews the formal mechanisms of exploratory and transformational creativity. The presented approach is based on the conceptual space proposed by Boden and formalized by other authors in a way that facilitates the implementation of these mechanisms. The presented formulation is applied to a the real case of creative designing in which a new combination of chocolate and fruit is desired. The experimentation has been conducted jointly with a Spanish chocolate chef. Data collected from the chef has been used to validate the proposed system. Experimental results show that the formulation presented is not only useful for understanding how the creative mechanisms of design works, but also facilitates its implementation in real cases to support creativity processes.

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