https://hdl.handle.net/2238/11317 2026-06-10T04:53:53Z 2026-06-10T04:53:53Z Soto-Quiros, Pablo Torokhti, Anatoli https://hdl.handle.net/2238/9826 2025-09-25T15:55:03Z 2016-01-01T00:00:00Z

Generalized brillinger-like transforms Soto-Quiros, Pablo; Torokhti, Anatoli We propose novel transforms of stochastic vectors, called the generalized Brillinger transforms (GBT1 and GBT2), which are generalizations of the Brillinger transform (BT). The GBT1 extends the BT to the cases when the covariance matrix and the weighting matrix are singular, and moreover, the weighting matrix is not necessarily symmetric. We show that the GBT1 may computationally be preferable over another related optimal technique, the generic Karhunen–Loève transform (GKLT). The GBT2 generalizes the GBT1 to provide, under the condition we impose, better associated accuracy than that of the GBT1. It is achieved because of the increase in a number of parameters to optimize compared to that in the GBT1. Artículo científico

2016-01-01T00:00:00Z Meza-Cascante, Luis Gerardo Suárez-Valdés-Ayala, Zuleyka Schmidt-Quesada, Sandra https://hdl.handle.net/2238/9661 2025-08-01T14:12:39Z 2014-01-01T00:00:00Z

La actitud del personal docente de matemática hacia el aprendizaje cooperativo y los elementos institucionales que favorecen o dificultan el empleo de esa metodología didáctica. Meza-Cascante, Luis Gerardo; Suárez-Valdés-Ayala, Zuleyka; Schmidt-Quesada, Sandra This paper presents the results of research conducted in high schools in the central region of the Cartago province, Costa Rica. The goal of the research was to determine the attitude of high school math teachers toward cooperative learning in math and identify factors in secondary education institutions that can help or hinder the implementation of cooperative learning as a strategy for teaching mathematics. The research was conducted with 39 secondary education math teachers, who participated in a workshop on cooperative learning in mathematics. The attitude toward this methodology was measured by using semantic differential. This information was triangulated with data obtained from non-participant observation. A combination of in-depth interviews and non-participant observation was used to access data that identifies institutional factors helping or hindering the implementation of math cooperative learning. Findings suggest a positive attitude from teachers toward integrating cooperative work as a teaching strategy to promote math learning and toward the role played by school principals in the adoption of educational innovations. It also reveals that high schools have adequate material conditions to implement the methodology, although the need for training is considered. This finding should be taken into account by the proponents of this methodological option. Artículo científico

2014-01-01T00:00:00Z Soto-Quiros, Pablo https://hdl.handle.net/2238/7191 2024-08-29T16:32:18Z 2015-01-01T00:00:00Z

Application of block matrix theory to obtain the inverse transform of the vector-valued DFT Soto-Quiros, Pablo We study the vector-valued discrete Fourier transform (vector-valued DFT) and its inverse transform, the vector-valued DFT inversion, through its block matrix representation. These transforms are defined for N- periodic signals, taking values in CD. The vector-valued DFT is a gen- eralization of classical discrete Fourier transform definition. The goal of this paper is present necessary and sufficient new conditions to vector- valued DFT inversion, and so, to make a perfect recovery of original signal. https://www.scopus.com/inward/record.url?eid=2-s2.0-84929903975&partnerID=40&md5=6e63d2349064a8ba147c960968f44c64

2015-01-01T00:00:00Z