Browsing Investigaciones by Title
Now showing items 1243-1262 of 1467
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Scenario-Based Model for the Location of Multiple Uncapacitated Facilities: Case Study in an Agro-Food Supply Chain
(Cartagena de Indias, 2021-09-29)Supply chains for agricultural products have taken on great importance in recent times due to the need that exists for consumers to acquire fresh products in excellent quality conditions. In the design of supply networks ... -
SCES Integration in Power Grids: A PBC Approach under abc, αβ0 and dq0 Reference Frames
(Institute of Electrical and Electronics Engineers Inc., 2018)This paper presents an integration of three-phase supercapacitor energy storage (SCES) in power grids via passivity-based control (PBC) theory under different reference frames. The SCES systems have the possibility to ... -
Scientific reasoning skills and patterns of use of Information and Communication Technologies. The case of the students of the Universidad de Santander (Valledupar, Colombia)
(Cartagena de Indias, 2019-10-30)This research establishes the relationship that has had the development of the skills of scientific reasoning and the patterns of use of tools and resources of information and communication technology (ICT). For that, it ... -
Seasonality effect analysis and recognition of charging behaviors of electric vehicles: A data science approach
(Cartagena de Indias, 2020-09-20)Electric vehicles (EVs) presence in the power grid can bring about pivotal concerns regarding their energy requirements. EVs charging behaviors can be affected by several aspects including socio-economics, psychological, ... -
Second-order cone approximation for voltage stability analysis in direct-current networks
(Cartagena de Indias, 2020-09-24)In this study, the voltage stability margin for direct current (DC) networks in the presence of constant power loads is analyzed using a proposed convex mathematical reformulation. This convex model is developed by employing ... -
Selection and Location of Fixed-Step Capacitor Banks in Distribution Grids for Minimization of Annual Operating Costs: A Two-Stage Approach
(Cartagena de Indias, 2022-06-27)The problem regarding the optimal location and sizing of fixed-step capacitor banks in distribution networks with radial configuration is studied in this research by applying a two-stage optimization approach. The first ... -
Selection of a Stopping Criterion for Anisotropic Diffusion Filtering in Ultrasound Images
(Institute of Electrical and Electronics Engineers Inc., 2019)Ultrasound imaging is a safe and cost-effective diagnostic tool, but the quality of the images is affected by speckle noise and artifacts. Anisotropic diffusion filters can be used to reduce noise and preserve the edges ... -
Selection of hydrological probability distributions for extreme rainfall events in the regions of Colombia
(Cartagena de Indias, 2020-05-14)Frequency analysis of extreme events is used to estimate the maximum rainfall associated with different return periods and is used in planning hydraulic structures. When carrying out this type of analysis in engineering ... -
Self-reported pedestrian falls in 15 countries worldwide
(Cartagena de Indias, 2024-07-16)Background Many factors are associated with pedestrian injuries and accidents. If a pedestrian is injured in an outdoor public space, we are talking about a “pedestrian fall”. Pedestrian falls are a more common cause of ... -
Self-supervised Deep-Learning Segmentation of Corneal Endothelium Specular Microscopy Images
(Cartagena de Indias, 2023)Computerized medical evaluation of the corneal endothelium is challenging because it requires costly equipment and specialized personnel, not to mention that conventional techniques require manual annotations that are ... -
Self-Unit Commitment of Combined-Cycle Units with Real Operational Constraints
(Cartagena de IndiasCampus TecnológicoIngeniería Eléctrica, 2023-12-21)Este artículo destaca la importancia de modelar con precisión las limitaciones operativas de las plantas de gas de ciclo combinado (CCGT por sus siglas en ingles) dentro de un marco de despacho económico. En la práctica, ... -
Semiclassical self consistent treatment of the emergence of seeds of cosmic structure. the second order construction
(Institute of Physics Publishing, 2018)In this work we extend the results of [1] where, Semiclassical Selfconsistent Configurations (SSC) formalism was introduced. The scheme combines quantum field theory on a background space-time, semiclassical treatment of ... -
Sensitivity of Empirical Equation Parameters for the Calculation of Time of Concentration in Urbanized Watersheds
(Cartagena de Indias, 2022-09-13)settingsOrder Article Reprints Open AccessArticle Sensitivity of Empirical Equation Parameters for the Calculation of Time of Concentration in Urbanized Watersheds by Jamilton Echeverri-Díaz 1,Óscar E. Coronado-Hernández ... -
Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach
(Cartagena de Indias, 2021-09-24)The problem of voltage regulation in unknown constant resistive loads is addressed in this paper from the nonlinear control point of view for second-order DC-DC converters. The converters’ topologies analyzed are: (i) buck ... -
Sequential quadratic programming models for solving the OPF problem in DC grids
(Elsevier Ltd, 2019)In this paper, we address the optimal power flow problem in dc grids (OPF-DC). Our approach is based on sequential quadratic programming which solves the problem associated with non-convexity of the model. We propose two ... -
Sequential spectral changes of Meloidogyne enterolobii-infected plants using two dimensional correlation IR spectroscopy
(Cartagena de Indias, 2020-10-29)In this work, we found that tomato and guava plants infected with Meloidogyne enterolobii showed different Fourier-transformed infrared spectral patterns compared to non-infected plants. Additionally, by using two-dimensional ... -
Sex Role Ideology of Students in a Colombian Engineering Faculty
(Cartagena de Indias, 2022-02-21)This paper examined the perceptions of students from different engineering programs at a private university in Cartagena de Indias (N = 243) with the aim of clearly identifying the profile of an engineer in training with ... -
SIDS-DDoS, a Smart Intrusion Detection System for Distributed Denial of Service Attacks
(Springer, 2020)In the last few years, the Digital Services industry has grown tremendously, offering numerous services through the Internet and using a recent concept or business model called cloud computing. For this reason, new threats ... -
SIMALL: Emotional BDI Model for Customer Simulation in a Mall
(Cartagena de Indias, 2022-11-15)Modeling customer behavior and exploring the motivations that drive their actions within a shopping mall is the subject of study in multiple works, which has generated new theories in marketing and related areas. However, ... -
Simplified mathematical model for computing draining operations in pipelines of undulating profiles with vacuum air valves
(Cartagena de Indias, 2020-09-11)The draining operation involves the presence of entrapped air pockets, which are expanded during the phenomenon occurrence generating drops of sub-atmospheric pressure pulses. Vacuum air valves should inject enough air to ...
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.
