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Mostrando ítems 1378-1397 de 1405
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Voltage Regulation in a Buck Converter for an Unknown CPL: An Extended Feedback Control Design
(Cartagena de Indias, 2023-03-03)This paper deals with the problem of the output voltage regulation in a buck converter for an unknown constant power terminal (CPL) which generates a nonlinear dynamical model that requires an efficient control technique. ... -
Voltage regulation of an isolated DC microgrid with a constant power load: a passivity-based control design
(Cartagena de Indias, 2021-08-28)Passivity-based nonlinear control for an isolated microgrid system is proposed in this paper. The microgrid consists of a photovoltaic array and a battery energy storage connected to a point of common converters, supplying ... -
Voltage Stability Analysis in Medium-Voltage Distribution Networks Using a Second-Order Cone Approximation
(Cartagena de Indias, 2020-11-02)This paper addresses the voltage stability margin calculation in medium-voltage distribution networks in the context of exact mathematical modeling. This margin calculation is performed with a second-order cone (SOCP) ... -
Voltage stability margin in DC grids with CPLs: A recursive Newton-raphson approximation
(Cartagena de Indias, 2019-03-11)This express brief addresses the voltage collapse problem in direct-current (dc) networks by using a recursive heuristic search algorithm based on the Newton-Raphson method. The determinant of the Jacobian matrix in the ... -
¿Volver o no volver a las clases presenciales? Motivaciones y temores que influyen en la deserción universitaria en Colombia en tiempos de postpandemia
(Cartagena de IndiasCampus TecnológicoComunicación Social, 2024-04-30)Objetivo: La pandemia de Covid-19 interrumpió la educación presencial en la mayoría de los países del mundo. Las universidades colombianas no fueron la excepción, y ahora, con el regreso a las aulas físicas, enfrentan ... -
Vortex Search Algorithm for Optimal Power Flow Analysis in DC Resistive Networks With CPLs
(Cartagena de Indias, 2019-08-30)This express brief addresses the optimal power flow (OPF) analysis in direct-current (DC) resistive networks with constant power loads (CPLs). The OPF employs the vortex search algorithm (VSA) in conjunction with a power ... -
Vortex Search Algorithm for Optimal Sizing of Distributed Generators in AC Distribution Networks with Radial Topology
(Springer, 2019)This paper proposes a vortex search algorithm (VSA) optimization for optimal dimensioning of distributed generators (DGs), in radial alternating current (AC) distribution networks. The VSA corresponds to a metaheuristic ... -
Vortex search and Chu-Beasley genetic algorithms for optimal location and sizing of distributed generators in distribution networks: A novel hybrid approach
(Cartagena de Indias, 2020-08-03)In this study, we analyzed the optimal location and sizing of distributed generators (DGs) in radial distributed networks using a hybrid master-slave metaheuristic technique. The master stage corresponds to the selection ... -
VRP model with time window, multiproduct and multidepot
(Cartagena de Indias, 2020-02-15)With the increase in the transfer of products in supply chains, the organization of routes requires a complex allocation insofar as different environmental variables are considered, and VRP models are an efficient tool for ... -
VSC with direct PI power control for frequency compensation in a microgrid: A PBC approach
(Institute of Electrical and Electronics Engineers Inc., 2019)The power systems with low inertia such as microgrids require advanced control strategies to improve their performance. These type of grids use voltage source converters to interconnect renewable energy sources and storage ... -
Wage and subjective conditions assessing tool applied for the quality of work: Case of the manufacturing sector of the Colombian Caribbean region
(International Business Information Management Association, IBIMA, 2018)Wage and Subjective Conditions Assessing Tool was designed and applied as a tool for assessing psychosocial components of job safety in a sample of 518 employees from different companies in the manufacturing sector of the ... -
What is photography and where is it going?
(Cartagena de IndiasCampus Tecnológico, 2021-07) -
What is the best triangulation approach for a structured light system?
(Cartagena de Indias, 2020-05-18)It has become customary to calibrate a camera-projector pair in a structured light (SL) system as a stereo-vision setup. The 3D reconstruction is carried out by triangulation from the detected point at the camera sensor ... -
Which cost of debt should be used in forecasting cash flows?
(Cartagena de Indias, 2009-04-20)Frequently, analysts and teachers use the capitalized rate of interest for the cost of debt when forecasting and discounting cash flows. Others estimate the interest payments when forecasting annual financial statements ... -
Which factors explain information exchange and user referral among program implementers?
(Cartagena de Indias, 2021-05-26)The Program for Psychosocial Care and Comprehensive Health for Victims serves, on a yearly basis, an average of 25,000 users in northern Colombia alone. The program is implemented by multidisciplinary teams comprised of ... -
Who Participates in Popular Feasts and Festivals? An Empirical Approach from Cultural Economics Applied to the Carnival of Barranquilla (Colombia)
(Cartagena de Indias, 2021-12-02)The empirical analysis of individual participation in local and popular feasts and festivals is a field little explored by cultural economists. This article proposes a methodological scheme to analyse the profile of the ... -
Wide-field 3D imaging with an LED pattern projector for accurate skin feature measurements via Fourier transform profilometry
(SPIE, 2019)Accurate 3D imaging of human skin features with structured light methods is hindered by subsurface scattering, the presence of hairs and patient movement. In this work, we propose a wide-field 3D imaging system capable of ... -
Willingness to change car use to commute to the UPTC main campus, Colombia: A hybrid discrete choice modeling approach
(University of Minnesota, 2019)This paper studies the willingness to change car use when commuting to a university campus. We estimated a hybrid discrete choice (HDC) model to test the hypothesis that, in addition to traditional tangible attributes, the ... -
Wireless passive sensing application using a cavity loaded evanescent mode half mode substrate integrated waveguide resonator
(2011)In this work, an evanescent mode half mode substrate integrated waveguide (HMSIW) resonator is designed for a wireless passive sensing application at 5 GHz. The wireless pressure sensor has been implemented by placing a ... -
Wirtinger's Calculus for the Load Flow in Power Distribution Grids
(Institute of Electrical and Electronics Engineers Inc., 2018)This paper shows a Wirtinger's-Calculus based loadflow methodology for power distribution grids. This approach allows to obtain an algorithm which works directly on the complex domain maintaining some useful symmetries and ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.