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Voice compression using discrete cosine transform and wavelet transform
(Institute of Physics Publishing, 2019)Compressing information, such as voice, allows freeing up memory space, better utilizing bandwidth, in other words taking advantage of resources more efficiently in a time where technologies such as Voice over Internet ... -
Volatile organic compounds in the atmosphere of Mexico City
(Elsevier Ltd, 2015)The Mexico City Metropolitan Area (MCMA) is one of the most polluted megacities in North America. Therefore, it is an excellent benchmark city to understand atmospheric chemistry and to implement pilot countermeasures. Air ... -
Voltage and Frequency Regulation on Isolated AC Three-phase Microgrids via s-DERs
(IEEE Computer Society, 2019)This paper addresses the voltage regulation problem on isolated three-phase microgrids via passivity-based control (PBC) with a proportional regulator under the abc reference frame. This reference frame is employed to ... -
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 ... -
Voluntarias de la prevención contra la ceguera
(1986)Un grupo de personas voluntarios en la prevención de la ceguera. -
¿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 ... -
Voz IP la revolución de las redes telefónicas
(Universidad Tecnológica de Bolívar, 2003)La finalidad de esta monografía no es realizar un manual de VoIP, por lo contrario es mostrar como esta tecnología incursiona cada vez mas en el mundo de las telecomunicaciones, sus ventajas, defectos y virtudes que ... -
VPN sobre linux: análisis de CIPE y PPTP
(Universidad Tecnológica de Bolívar, 2004)El desarrollo de las comunicaciones ha permitido que las empresas a nivel mundial, expandan la cantidad y calidad de los servicios que prestan a través de sus redes, pero los costos que implica mantener enlaces permanentes ... -
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 ... -
Walters American Hotel
(1920)Calle de la Universidad, aun sin adoquinar. Vemos la tablilla de uno de los pocos sitios de hospedaje de la ciudad, el Walters American Hotel, y al fondo, a la derecha, el antiguo claustro de San Agustín, en donde funciona ... -
Web defacement /
(Universidad Tecnológica de Bolívar, 2016)En el siguiente proyecto investigativo encontraremos un seguimiento a la p´agina principal de la Universidad Tecnol´ogica de Bol´ıvar (www.unitecnologica.edu.co). El seguimiento fue de dos meses, donde en el primer mes ... -
What is photography and where is it going?
(Cartagena de IndiasCampus Tecnológico, 2021-07)
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.