Otniel Portillo-Rodríguez | Universidad Autónoma del Estado de México (original) (raw)
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Papers by Otniel Portillo-Rodríguez
Communications in computer and information science, 2024
Lecture Notes in Computer Science, Sep 14, 2008
This paper presents a multimodal system capable to understand and correct in real-time the moveme... more This paper presents a multimodal system capable to understand and correct in real-time the movements of Tai-Chi students through the integration of audiovisual -tactile technologies. This platform acts like a virtual teacher that transfers the knowledge of five Tai-Chi movements using feedback stimuli to compensate the errors committed by a user during the performance of the gesture. The fundamental components of this multimodal interface are the gesture recognition system (using k-means clustering, Probabilistic Neural Networks (PNN) and Finite State Machines (FSM)) and the real-time descriptor of motion which is used to compute and qualify the actual movements performed by the student respect to the movements performed by the master, obtaining several feedbacks and compensating this movement in real-time varying audiovisual -tactile parameters of different devices. The experiments of this multimodal platform have confirmed that the quality of the movements performed by the students is improved significantly.
The use of photovoltaic (PV) systems is increasingly growing in importance since they involve an ... more The use of photovoltaic (PV) systems is increasingly growing in importance since they involve an exploitation of solar radiation constituting an energy source which is renewable, available in most places, and pollution-free. Despite their numerous advantages, PV systems have two major drawbacks: low energy conversion efficiency and loss of energy due to variations in meteorological conditions; for this reason, Maximum Power Point Tracking (MPPT) control techniques play a key role in exploiting the maximum energy caught by PV modules. This paper presents a brief review of the main MPPT strategies: general characteristics, advantages, and drawbacks of the proposed methods are discussed.
inalámbrica de humedad relativa y temperatura para estrategias de monitoreo puntual y distribuido... more inalámbrica de humedad relativa y temperatura para estrategias de monitoreo puntual y distribuido. Abstract—En este artículo se presenta un sistema de monitoreo distribuido por comunicación inalámbrica que permite medir de forma puntual los gradientes de temperatura y humedad relativa en diferentes puntos dentro de un volumen o área especifico donde se almacenan productos agrícolas tales como: cacao, café, tabaco o azúcar. El sistema completo se compone principalmente de instrumentos de medición, un receptor inalámbrico y una interfaz para la administración y manejo de datos provenientes de la distribución de los instrumentos, esto debido a la capacidad de escalabilidad que presenta dicho sistema.
The establishment of heterotic groups and heterotic patterns is crucial to a successful maize hyb... more The establishment of heterotic groups and heterotic patterns is crucial to a successful maize hybrid breeding programme. Molecular markers can be used for differentiating maize into heterotic groups which can be used for maximum exploitation of heterosis. A core set of 45 maize inbred lines was selected from 96 maize inbred lines that were obtained from major breeding programmes in Zambia, Zimbabwe, CIMMYT, IITA, and USA. The 45 in- bred lines were assessed for their genetic diversity and assigned to different heterotic groups using 129SNPs. The genetic distance ranged from 0.03 to 0.99, with the highest distance observed between inbred lines B73 and Mo17 and the least between L3233 and N3. The inbred lines were clustered into four groups which corresponded to the N, SC, BSS, and Lancaster heterotic groups. The genetic divergence among temperate inbred lines was larger than that among tropical inbred lines. Temperate inbred lines with potential to improve the heterotic response of t...
Gaceta medica de Mexico, 2018
En el Estado de México no existen investigaciones que proporcionen información para toma de decis... more En el Estado de México no existen investigaciones que proporcionen información para toma de decisiones y administración de recursos relacionados con la atención de las lesiones por causa externa (LCE). Describir las LCE en un servicio de urgencias durante un periodo de cinco años. Se diseñó un estudio retrospectivo con pacientes que ingresaron al servicio de urgencias (2010-2015) por diagnóstico de LCE. Se realizó análisis descriptivo y de clúster. En el servicio de urgencias, 16.59 % de las atenciones derivaron de LCE. Se incluyeron 16 567 pacientes de 14 a 99 años (media o promedio = 37.7, DE = 17.28), 69.2 % fue del sexo masculino. Las LCE principalmente ocurrieron en la vía pública (26.3 %) y en el hogar (23.7 %). Las causas más frecuentes fueron agresiones fuera del hogar (32.7 %), en promedio a los 34 años; caídas (25 %) en promedio a los 45 años; accidentes ocasionados por vehículos de motor (9.7 %), en promedio a los 33 años. El análisis por clúster identificó cuatro grupos:...
2016 13th International Conference on Power Electronics (CIEP), 2016
This document presents the design and construction of a plasma generator for electrosurgical appl... more This document presents the design and construction of a plasma generator for electrosurgical applications. The generator is comprised of four main parts: DC power supply, topology push-pull, controller unit and plasma probe. First results generating plasma by repetitively-pulsed electrical discharges in sodium chloride saline solution are reported.
ABSTRACT En este artículo se presenta el diseño y desarrollo de un sistema vibrotáctil implementa... more ABSTRACT En este artículo se presenta el diseño y desarrollo de un sistema vibrotáctil implementado en un robot planar con 3 grados de libertad teniendo como fin rehabilitar las extremidades superiores de un paciente y proporcionarle estímulos hápticos. Este sistema obtiene información de las posiciones que realizan los pacientes durante su rehabilitación para que el fisioterapeuta pueda utilizar dicha información la cual es de vital importancia en áreas como la rehabilitación y transferencia de habilidades. Este sistema también ofrece el poder acelerar procesos neuroplásticos al mismo tiempo de ser un sistema de bajo costo.
A novel methodology for Enactive Skills Transmission of Tai Chi movements through sound feed-back... more A novel methodology for Enactive Skills Transmission of Tai Chi movements through sound feed-back stimuli is presented in this paper. We adopted the paradigm of spatial sound and frequency distortion as an accurate methodology for the transmission of error-feedback to the user. An intelligent system based on Gesture recognition methodologies and a real-time motion descriptor system is applied to engage and guide the users to perform an unknown movement in a natural and transparent process using the sound like the base of the transfer of the skill.
OBJECTIVE This paper presents the design and development of a new electronic portable device to a... more OBJECTIVE This paper presents the design and development of a new electronic portable device to assess the human balance of the human body during standing, using a minimal number of sensors and peripheral components. This device is aimed to evaluate human balance in environments outside of specialized laboratories, such as small clinics and therapy offices. APPROACH The design is based on previous designs using three or more resistive force sensors attached to the feet, however in the present work, the sensors were attached on an adjustable platform, to fit several sizes of feet. Furthermore, all the signal acquisition, process, storage and display are executed by an embedded electronic system, thus avoiding the use of computers and external peripherals. A new method to compute the CoP using only two sensors per foot was developed and tested in a group of 50 university students, (17 women and 33 men), 26.04 ± 4.94 years. MAIN RESULTS It was developed a portable electronic system to ...
Background The timely detection of fall risk or balance impairment in older adults is transcenden... more Background The timely detection of fall risk or balance impairment in older adults is transcendental because, based on a reliable diagnosis, clinical actions can be taken to prevent accidents. This study presents a statistical model to estimate the fall risk from the center of pressure (CoP) data. Methods This study is a cross-sectional analysis from a cohort of community-dwelling older adults aged 60 and over living in Mexico City. CoP balance assessments were conducted in 414 older adults (72.2% females) with a mean age of 70.23 ± 6.68, using a modified and previously validated Wii Balance Board (MWBB) platform. From this information, 78 CoP indexes were calculated and analyzed. Multiple logistic regression models were fitted in order to estimate the relationship between balance alteration and the CoP indexes and other covariables. Results The CoP velocity index in the Antero-Posterior direction with open eyes (MVELAPOE) had the best value of area under the curve (AUC) to identify...
International Journal of Human-Computer Studies, Feb 1, 2018
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights A new interaction technique based on contextual information using a multimodal system for force pattern learning is proposed. Using the contextual information approach, the trainees obtain information about the evolution of their performance along the time (helping to correct the errors). The findings suggest that the contextual information provides a better trainee's performance than the punctual information. One drawback of the training strategies based on punctual feedback is the difficulty that users have in interpreting the information. The contextual approach could be used to extend the capabilities of haptic training procedures based on haptic guidance to provide information about the level of force to be applied during the execution of a specific task.
Communications in computer and information science, 2024
Lecture Notes in Computer Science, Sep 14, 2008
This paper presents a multimodal system capable to understand and correct in real-time the moveme... more This paper presents a multimodal system capable to understand and correct in real-time the movements of Tai-Chi students through the integration of audiovisual -tactile technologies. This platform acts like a virtual teacher that transfers the knowledge of five Tai-Chi movements using feedback stimuli to compensate the errors committed by a user during the performance of the gesture. The fundamental components of this multimodal interface are the gesture recognition system (using k-means clustering, Probabilistic Neural Networks (PNN) and Finite State Machines (FSM)) and the real-time descriptor of motion which is used to compute and qualify the actual movements performed by the student respect to the movements performed by the master, obtaining several feedbacks and compensating this movement in real-time varying audiovisual -tactile parameters of different devices. The experiments of this multimodal platform have confirmed that the quality of the movements performed by the students is improved significantly.
The use of photovoltaic (PV) systems is increasingly growing in importance since they involve an ... more The use of photovoltaic (PV) systems is increasingly growing in importance since they involve an exploitation of solar radiation constituting an energy source which is renewable, available in most places, and pollution-free. Despite their numerous advantages, PV systems have two major drawbacks: low energy conversion efficiency and loss of energy due to variations in meteorological conditions; for this reason, Maximum Power Point Tracking (MPPT) control techniques play a key role in exploiting the maximum energy caught by PV modules. This paper presents a brief review of the main MPPT strategies: general characteristics, advantages, and drawbacks of the proposed methods are discussed.
inalámbrica de humedad relativa y temperatura para estrategias de monitoreo puntual y distribuido... more inalámbrica de humedad relativa y temperatura para estrategias de monitoreo puntual y distribuido. Abstract—En este artículo se presenta un sistema de monitoreo distribuido por comunicación inalámbrica que permite medir de forma puntual los gradientes de temperatura y humedad relativa en diferentes puntos dentro de un volumen o área especifico donde se almacenan productos agrícolas tales como: cacao, café, tabaco o azúcar. El sistema completo se compone principalmente de instrumentos de medición, un receptor inalámbrico y una interfaz para la administración y manejo de datos provenientes de la distribución de los instrumentos, esto debido a la capacidad de escalabilidad que presenta dicho sistema.
The establishment of heterotic groups and heterotic patterns is crucial to a successful maize hyb... more The establishment of heterotic groups and heterotic patterns is crucial to a successful maize hybrid breeding programme. Molecular markers can be used for differentiating maize into heterotic groups which can be used for maximum exploitation of heterosis. A core set of 45 maize inbred lines was selected from 96 maize inbred lines that were obtained from major breeding programmes in Zambia, Zimbabwe, CIMMYT, IITA, and USA. The 45 in- bred lines were assessed for their genetic diversity and assigned to different heterotic groups using 129SNPs. The genetic distance ranged from 0.03 to 0.99, with the highest distance observed between inbred lines B73 and Mo17 and the least between L3233 and N3. The inbred lines were clustered into four groups which corresponded to the N, SC, BSS, and Lancaster heterotic groups. The genetic divergence among temperate inbred lines was larger than that among tropical inbred lines. Temperate inbred lines with potential to improve the heterotic response of t...
Gaceta medica de Mexico, 2018
En el Estado de México no existen investigaciones que proporcionen información para toma de decis... more En el Estado de México no existen investigaciones que proporcionen información para toma de decisiones y administración de recursos relacionados con la atención de las lesiones por causa externa (LCE). Describir las LCE en un servicio de urgencias durante un periodo de cinco años. Se diseñó un estudio retrospectivo con pacientes que ingresaron al servicio de urgencias (2010-2015) por diagnóstico de LCE. Se realizó análisis descriptivo y de clúster. En el servicio de urgencias, 16.59 % de las atenciones derivaron de LCE. Se incluyeron 16 567 pacientes de 14 a 99 años (media o promedio = 37.7, DE = 17.28), 69.2 % fue del sexo masculino. Las LCE principalmente ocurrieron en la vía pública (26.3 %) y en el hogar (23.7 %). Las causas más frecuentes fueron agresiones fuera del hogar (32.7 %), en promedio a los 34 años; caídas (25 %) en promedio a los 45 años; accidentes ocasionados por vehículos de motor (9.7 %), en promedio a los 33 años. El análisis por clúster identificó cuatro grupos:...
2016 13th International Conference on Power Electronics (CIEP), 2016
This document presents the design and construction of a plasma generator for electrosurgical appl... more This document presents the design and construction of a plasma generator for electrosurgical applications. The generator is comprised of four main parts: DC power supply, topology push-pull, controller unit and plasma probe. First results generating plasma by repetitively-pulsed electrical discharges in sodium chloride saline solution are reported.
ABSTRACT En este artículo se presenta el diseño y desarrollo de un sistema vibrotáctil implementa... more ABSTRACT En este artículo se presenta el diseño y desarrollo de un sistema vibrotáctil implementado en un robot planar con 3 grados de libertad teniendo como fin rehabilitar las extremidades superiores de un paciente y proporcionarle estímulos hápticos. Este sistema obtiene información de las posiciones que realizan los pacientes durante su rehabilitación para que el fisioterapeuta pueda utilizar dicha información la cual es de vital importancia en áreas como la rehabilitación y transferencia de habilidades. Este sistema también ofrece el poder acelerar procesos neuroplásticos al mismo tiempo de ser un sistema de bajo costo.
A novel methodology for Enactive Skills Transmission of Tai Chi movements through sound feed-back... more A novel methodology for Enactive Skills Transmission of Tai Chi movements through sound feed-back stimuli is presented in this paper. We adopted the paradigm of spatial sound and frequency distortion as an accurate methodology for the transmission of error-feedback to the user. An intelligent system based on Gesture recognition methodologies and a real-time motion descriptor system is applied to engage and guide the users to perform an unknown movement in a natural and transparent process using the sound like the base of the transfer of the skill.
OBJECTIVE This paper presents the design and development of a new electronic portable device to a... more OBJECTIVE This paper presents the design and development of a new electronic portable device to assess the human balance of the human body during standing, using a minimal number of sensors and peripheral components. This device is aimed to evaluate human balance in environments outside of specialized laboratories, such as small clinics and therapy offices. APPROACH The design is based on previous designs using three or more resistive force sensors attached to the feet, however in the present work, the sensors were attached on an adjustable platform, to fit several sizes of feet. Furthermore, all the signal acquisition, process, storage and display are executed by an embedded electronic system, thus avoiding the use of computers and external peripherals. A new method to compute the CoP using only two sensors per foot was developed and tested in a group of 50 university students, (17 women and 33 men), 26.04 ± 4.94 years. MAIN RESULTS It was developed a portable electronic system to ...
Background The timely detection of fall risk or balance impairment in older adults is transcenden... more Background The timely detection of fall risk or balance impairment in older adults is transcendental because, based on a reliable diagnosis, clinical actions can be taken to prevent accidents. This study presents a statistical model to estimate the fall risk from the center of pressure (CoP) data. Methods This study is a cross-sectional analysis from a cohort of community-dwelling older adults aged 60 and over living in Mexico City. CoP balance assessments were conducted in 414 older adults (72.2% females) with a mean age of 70.23 ± 6.68, using a modified and previously validated Wii Balance Board (MWBB) platform. From this information, 78 CoP indexes were calculated and analyzed. Multiple logistic regression models were fitted in order to estimate the relationship between balance alteration and the CoP indexes and other covariables. Results The CoP velocity index in the Antero-Posterior direction with open eyes (MVELAPOE) had the best value of area under the curve (AUC) to identify...
International Journal of Human-Computer Studies, Feb 1, 2018
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights A new interaction technique based on contextual information using a multimodal system for force pattern learning is proposed. Using the contextual information approach, the trainees obtain information about the evolution of their performance along the time (helping to correct the errors). The findings suggest that the contextual information provides a better trainee's performance than the punctual information. One drawback of the training strategies based on punctual feedback is the difficulty that users have in interpreting the information. The contextual approach could be used to extend the capabilities of haptic training procedures based on haptic guidance to provide information about the level of force to be applied during the execution of a specific task.