Ingeniería eléctrica
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Open–Access Model of a PV–BESS System: Quantifying Power and Energy Exchange for Peak Shaving and Self Consumption Applications
(2023)Energy storage is vital for a future where energy generation transitions from a fossil fuels-based one to an energy system that relies heavily on clean energy sources such as photovoltaic (PV) solar energy. To foster this ... -
Robust PI/PID controllers for load disturbance based on direct synthesis
(2018-10)It is recognized that disturbance rejection is much more important than set-point tracking for many process control applications, leading set-point tracking to a secondary level of interest. In this paper a proposal for ... -
Improvement of the Control System Performance based on Fractional-Order PID Controllers and Models with Robustness Considerations
(2018)In this paper we assess the performance improvement achievable by using onedegree-of-freedom fractional-order proportional-integral-derivative controllers (FOPI/FOPID) instead of their integer-order counterparts (PI/PID). ... -
I-PD controller as an structural alternative to servo/regulation tradeoff tuning
(2018)One of the recurrent topics in the PI/PID literature of recent years is the incorporation of the tradeoff between the two possible modes of closed-loop operation: servo and regulation. Tuning rules are usually provided as ... -
Tissue damage-tracking control system for image-guided photothermal therapy of cancer
(2022)Photothermal therapy (PTT) is a type of cancer treatment capable of damaging tumors using laser irradiation. This procedure can be a promising approach to complement current cancer therapies, due in part to its minimal ... -
Modeling thermometry image perturbations during photoacoustic imaging-guided photothermal therapy
(2021)During hyperthermia treatments, temperature monitoring is needed to prevent overheating, which could cause evaporation and carbonization of tissue, and to focus, as much as possible, the thermal damage on the targeted ... -
Multivariable Fuzzy Logic Controlled Photothermal Therapy
(2021)Photothermal therapy has emerged as a potential modality to generate hyperthermia as cancer treatment due to its low invasiveness and its capacity to complement other cancer therapies. Undesired side effects can occur such ... -
Automated Quantification of Ki-67 on Gastric Epithelial Tissue based on Cell Nuclei Area Ratio
(2022)The objective was to develop an automated algorithm for the estimation of a protein (Ki-67) index based on cell nuclei area ratio of gastric epithelial tissue cells; for this purpose, digital histopathology images were ... -
A Novel Control System for Medium-Voltage Hexverter-Based Drives
(2020-09-23)In this paper, a novel control system for the Hexverter-based drive is proposed and analysed. Unlike previously proposed control schemes, the proposed one does not require the information of the machine variables to ... -
An Overview of Applications of the Modular Multilevel Matrix Converter
(2020-10-22)The modular multilevel matrix converter is a relatively new power converter topology suitable for high-power alternating current (AC)-to-AC applications. Several publications in the literature have highlighted the converter ... -
An Overview of Modelling Techniques and Control Strategies for Modular Multilevel Matrix Converters
(2020-09-08)The Modular Multilevel Matrix Converter is a relatively new power converter topology appropriate for high-power Alternating Current (AC) to AC purposes. Several publications in the literature have highlighted the converter ... -
Participación de cargas flexibles y recursos distribuidos de energía en el control primario de frecuencia de sistemas de potencia con baja inercia
(2022)Actualmente está en proceso una transición en la configuración de los sistemas eléctricos de potencia. En el esquema tradicional, la generación se concentra en las máquinas sincrónicas cuya operación involucra el uso de ... -
Performance Improvement of Alkaline–Electrolyte Aluminum–Air Batteries by NH4VO3-Based Additives
(2022-02-09)Due to their high theoretical volumetric capacity, aluminum–air batteries are an up-and-coming alternative for energy storage in mobile applications. However, there are still several problems that need to be solved to make ... -
From the Air to the Ground: An Experimental Approach to Assess LiPo Batteries for a Second Life
(2022-05)Many are the applications that use energy stored in lithium-ion (Li-ion) batteries to power themselves. Without a doubt this type of energy storage device has changed the way of living. However, a major concern regarding ... -
Robust energy system planning for decarbonization under technological uncertainty: From transport electrification to power system investments
(2022-08-25)This work develops energy system modeling tools that identify features of a robust energy policy: a policy that performs well relative to alternatives. The tools are based on the Open Souce Modeling System (OSeMOSYS), are ... -
A Comparative Study on Denoising Algorithms for Footsteps Sounds as Biometric in Noisy Environments
(2022-08-03)Biometrics is the automated identification of a person based on distinctive characteristics, such as fingerprints, face, voice, or the sound of footsteps. This last characteristic has significant challenges considering the ... -
Measuring the Quality of Low-Resourced Statistical Parametric Speech Synthesis Trained with Noise-Degraded Data Supported by the University of Costa Rica
(2022)After the successful implementation of speech synthesis in several languages, the study of robustness became an important topic so as to increase the possibility of building voices from non-standard sources, e.g. historical ... -
Impacto fiscal de la descarbonización del transporte en Costa Rica y opciones de política para manejarlo
(2021-07)El Plan de Descarbonización de Costa Rica promueve el transporte público como principal opción de movilidad y fomenta la electrificación de la flota vehicular, lo cual habilitará múltiples beneficios socioeconómicos. Sin ... -
An Experimental Study on Speech Enhancement Based on a Combination of Wavelets and Deep Learning
(2022-06-20)The purpose of speech enhancement is to improve the quality of speech signals degraded by noise, reverberation, or other artifacts that can affect the intelligibility, automatic recognition, or other attributes involved ... -
Identification of Costa Rican speaker’s age group based on acoustic vowel analysis
(2022-04-22)The identification of the speaker’s age is a fundamental task in human-computer interaction. In particular, the recognition of children has drawn attention from the research community due to the vulnerability of se persons ...
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