Productos de investigación

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12585/8849

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Influence of Arduino on the Development of Advanced Microcontrollers Courses
(Education Society of IEEE (Spanish Chapter), 2017) Martínez-Santos J.C.; Acevedo Patiño, Óscar; Contreras Ortiz, Sonia Helena
This paper describes the development of courses in the field of digital design that use Arduino boards as their main platforms. Arduino offers an intuitive development environment and multiple hardware and software resources that allow rapid development of microcontroller-based projects. However, due to the vast amount of information available, students were losing the capability to design their own prototypes. We propose a methodology that introduces the study of microcontrollers using Arduino to develop different types of projects and proceeds to study the system architecture to gain control on the device. This methodology has been used in an undergraduate course in microcontrollers and a graduate course in advanced techniques in digital design. The students of the microcontrollers course showed improved design skills and motivation compared to the students from previous versions of the course. With respect to the advanced techniques in digital design course, the students were able to take advantage of Arduino platform to gain a deep understanding of hardware/software co-design of embedded systems. © 2013 IEEE.
LFSR characteristic polynomial and phase shifter computation for two-dimensional test set generation
(Institute of Electrical and Electronics Engineers Inc., 2017) Acevedo Patiño, Óscar; Kagaris D.
In built-in two-dimensional deterministic test pattern generation, a Linear Feedback Shift Register (LFSR) extended by phase shifters (PS) is commonly used for generating the test patterns. The specific LFSR/PS structure is currently chosen a-priori without regard to the actual test set. In this paper, we present a method to design the LFSR/PS structure based on the particular test set that we are given. Comparative experimental results show that the methodology can attain 100% coverage which cannot be achieved with current approaches. © 2017 IEEE.
On the computation of LFSR characteristic polynomials for built-in deterministic test pattern generation
(IEEE Computer Society, 2016) Acevedo Patiño, Óscar; Kagaris D.
In built-in test pattern generation and test set compression, an LFSR is usually employed as the on-chip generator with an arbitrarily selected characteristic polynomial of degree equal, according to a popular rule, to Smax+20, where Smax is the maximum number of specified bits in any test cube of the test set. By fixing the polynomial a priori a linear system only needs to be solved to compute the required LFSR initial states (seeds) to generate the target test cubes, but the disadvantage is that the polynomial degree (length of the LFSR and seed bit size) may be too large and the fault coverage cannot be guaranteed. In this paper we address the problem of computing a polynomial of small degree directly from the given test set without having to solve multiple non-linear systems and fixing a priori the polynomial degree. The proposed method uses an adaptation of the Berlekamp-Massey algorithm and the Sidorenko-Bossert theorem to perform the computation. In addition, the method guarantees (by design) that all the test cubes in the given test set are generated, thereby achieving 100% coverage, which cannot be guaranteed under the 'trial-and-error' Smax+20 rule. Experimental results verify the advantages that the proposed methodology offers in terms of reduced polynomial degree and 100% coverage. © 1968-2012 IEEE.
On the nonlinear control of a single-phase current source converter for sinusoidal voltage generation
(2020) Montoya, O.D.; Acevedo Patiño, Óscar; Gil-González, Walter; Holguín, M.; Serra, F.M.
Colombian power system is being transformed for the large-scale integration of renewable energy resources and energy storage systems; all of these are integrated by power electronic converters controlled by voltage and current sources. In addition, for regulatory policies it is required that the alternating current networks that feeds linear and nonlinear loads, can provide pure sinusoidal voltage and current forms in terms of frequency and amplitude. To guarantee it, in this paper the design of a nonlinear controller for a single-phase current source converter is explored, which is switched through a pulse-width modulated signal for providing sinusoidal voltages on linear loads. It is applied a feedback nonlinear control design on the dynamical model of the converter by using its averaged representation. The proposed control strategy allows guaranteeing asymptotic stability in the sense of Lyapunov for closed-loop operation. In steady state conditions the voltage behavior on the linear load evidences a sinusoidal form with an estimation error lower than 0.667%, which can be considered negligible for any practical power system application. All the simulations are conducted via MATLAB software 2017b licensed by Universidad Tecnologica de Bolívar, Colombia.

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Browsing Productos de investigación by Author "Acevedo Patiño, Óscar"