José Antonio Reyes

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Perturbed harmonic oscillators describe many models in physics and engineering. A method for solving this type of problem is based on the utilization of Scheifele's functions, consisting of a refinement of the Taylor series method. One disadvantage of the method is that it is difficult to determine, in each case, the recurrence relations necessary for(More)
Many branches of Physics and Engineering use perturbed linear ODE´s. One method of resolution is based on the use of Scheifele functions for systems. This paper systematically expands three applications of the Scheifele method adapted to stiff problems. For this purpose, a family of matrices,-functions and the numerical method are presented for the(More)
In a first part, this article presents the adaptation of Scheifele functions to forced and damped oscillators, designing a series method based on these, which integrates the non perturbed problem with no truncation error. This method is highly accurate, however it is difficult to adapt to each specific problem. In order to overcome this difficulty, in a(More)
Multiple-valued logics are useful for dealing with uncertainty and imprecision in knowledge-based systems. In this paper, we present the foundations of QMORPH: a tool that assists users in the declaration of such logics and in the declaration of the communication mechanism between two of these different logics by preserving inference. 1 DEFINING MV-LOGICS(More)
Multiple-valued logics are useful for dealing with uncertainty and impre-cision in Knowledge-Based Systems. Different problems can require different logics. Then we need mechanisms to translate the information exchanged between two problems with different logics. In this paper, we introduce the logical foundations of such logics and the communication(More)
Multiple-valued logics are useful for dealing with uncertainty and impre-cision in Knowledge-Based Systems. Different problems can require different logics. Then we need mechanisms to translate the information exchanged between two problems with different logics. In this paper, we introduce the logical foundations of such logics and the communication(More)
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