Alejandro Echeverría

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In a Classroom Multiplayer Presential Game (CMPG) peers interact collaboratively with the virtual world and amongst themselves in a shared space. The design of this kind of game, however, is a complex process that must consider instruction strategies, methodology, usability and ludic aspects. This article’s aim is to develop and systematize guidelines for(More)
The progress registered in the use of video games as educational tools has not yet been successfully transferred to the classroom. In an attempt to close this gap, a framework was developed that assists in the design and classroom integration of educational games. The framework addresses both the educational dimension and the ludic dimension. The(More)
The use of handheld computers in educational contexts has increased considerably in recent years and their value as a teaching tool has been confirmed by many positive experiences, particular within collaborative learning systems (MCSCL). The cost of the devices has hindered widespread use in schools, however, and cell phones have emerged as an attractive(More)
We propose a new discriminative confidence measurement approach based on an evolution strategy for spoken term detection (STD). Our evolutionary algorithm, named evolutionary discriminant analysis (EDA), optimizes classification errors directly, which is a salient advantage compared with some conventional discriminative models which optimize objective(More)
We show in this paper that the squared norm of an individual subject to Gaussian mutation in an evolution strategy will grow on average linearly with the number of generations. Although we prove this result in the absence of selection, experimental evidence is provided showing that the result also holds in a full fledged evolution strategy applied to the(More)