2024-03-28T08:57:13Zhttp://dspace.ucuenca.edu.ec/oai/requestoai:dspace.ucuenca.edu.ec:123456789/213352020-07-31T22:09:16Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Agila, Wilton E.
author
Huilcapi, Victor M.
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
The real time determination of the critical states of operation of the fuel cell proton exchange membrane (acronym in English, PEM) is one of the main challenges for the control systems of PEM fuel cells. In this paper, the development and implementation of a non-invasive low cost method based on fuzzy decision techniques to estimate the critical states of operation of the PEM fuel cell is presented. The estimation is performed by perturbations of the state of operation of PEM fuel cell and the subsequent analysis of the temporal evolution of the voltage generated by the cell. The implementation of this stimulation-perceived technique of the state of fuel cell for the detection of critical states is a novelty and a step towards autonomous control in optimal operation of PEM fuel cells.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21335
Caracterizacion De Pilas De Combustible Pem
Estado De Inundacion
Deshidratacion De La Membrana Polimerica
Arbol De Decision Borroso
Control
Logica Difusa
Lógica borrosa para la estimación de estados críticos de una pila de combustible PEM
oai:dspace.ucuenca.edu.ec:123456789/213422020-07-31T22:09:16Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Ocampo Dávila, Andrés
author
Jiménez J., María Soledad
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
In this project, the characteristics and the operation mode for polymer optical fibers were studied to use them over an optical link to transmit information over short distances. The project also analyzed the active and passive components needed to achieve this goal, as active components the LED sources were studied and as passive components the multiplexers, filters and splitters were considered. On the other hand all of the nonlinear effects caused by the transmission of WDM (Wavelength Division Multiplexing) signals were examined. Finally, using MATLAB, a simulation of an optical link in the frequency domain was made using LED sources emitting light in the visible spectrum, together with WDM multiplexers, absorption filters, splitters and POF (Plastic Optical Fiber).
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21342
Comunicaciones Opticas
Fibras Opticas Plasticas
Multiplexacion
Division De Longitud
Longitud De Onda
Wavelength Division Multiplexing
Polymer Optical Fiber
Simulación de un enlace óptico WDM (Wavelength Division Multiplexing) utilizando POFs (Polymer Optical Fiber) en el espectro de luz visible
oai:dspace.ucuenca.edu.ec:123456789/213552020-07-31T22:09:17Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Véliz, Bremnen
author
Huilcapi, Víctor
author
Cajo, Ricardo
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
A comparative impedance study of a polymer type Thermoplastic Polyolefin Elastomer with a commercial universal gel electrode has been made in order to know whether the polymer can be used as dry electrode for the acquisition of cardiac signals. The results of the impedance spectroscopy showed very similar characteristics and that both devices behave as resistors. For instance, at 120 Hz the polymer measured a resistance of 6,3 k and the commercial gel electrode 7,2 k . Further, it was getting a linear relation of current versus voltage, determining resistances of 7 k and 8,2 k for the polymer and commercial gelled electrode respectively. Finally we have concluded that the polymer is applicable to construct dry electrodes.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21355
Electrodos
Polimeros
Poliolefina Termoplastica Elastomera
Electrocardiograma
Espectroscopia De Impedancia
Caracterización espectroscópica de impedancia de polímeros para el uso en electrodos de electrocardiogramas
oai:dspace.ucuenca.edu.ec:123456789/213662020-07-31T22:09:17Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Dos Reis, Jennifer
author
León, Juliana
author
Chang, Carolina
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
This article presents DeBuPa (Detección Búsqueda Pateo), a small humanoid (38 cm tall) built with the Bioloid Premium Kit. The CM-510 card has been excluded to be replaced by the Arbotix controller card, which is used to control the 16 motors Dynamixel AX-12 + (for moving the robot) and 2 analog servo (to move the camera). The camera has been connected to a Raspberry Pi mini- computer, as to enable the robot to autonomous detect and track the ball movements. All those actions must be properly coordinated so that the robot accomplishes the tasks of detection, tracking and kicking of the ball, requiring fluent communication between the Arbotix and Raspberry Pi. The tool used for this is the ROS (Robot Operating System) framework. The C++ language is used in the Raspberry Pi, a program capturing, filtering and processing the camera images, to find the ball, decides the action to take, and requests the Arbotix to execute the movements of the motors. To capture the camera images. The RasPiCam CV library is used to capture the camera images and the OpenCV libraries for the filtering and processing of the images. In addition, to steering the engines, the Arbotix takes care of the balance of the robot using as input signals of the Robotis Gyro sensor. If Arbotix detects an imbalance and even if the robot has fallen, the mechanism tries to help the robot to stand up.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21366
Arbotix
Raspberry Pi
Dynamixel
Robot Humanoide
Futbol
Opencv
Integración de Arbotix, Raspberry Pi y motores Dynamixel Ax-12+ para un robot humanoide que busca y patea pelotas
oai:dspace.ucuenca.edu.ec:123456789/213612020-07-31T22:09:18Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Darío Rojas, Rubén
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
This article proposes a new strategy of control based on continue measurements of glucose and a habituating sliding mode controller (HSMC). The HSMC is developed combining the sliding mode control law and the principles of habituating control. The HSMC applied to the regulation of blood glucose in the intensive care unit, includes both intravascular glucose and insulin infusion inputs to provide the nutrition supply and to improve the rejection to disturbances. The simulation based study (in silico), using a physiological model of the dynamic glucose-insulin, shows that proposed control strategy works properly. Finally, the performance of the proposed controller and a standard PID controller are compared.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21361
Control
Control Modo Deslizante
Regulacion De Glucosa Sanguinea
Servicios De Salud
Centro De Gestion
Glucosa Sanguinea
Control HSMC para regulación de glucosa sanguínea
oai:dspace.ucuenca.edu.ec:123456789/213372020-07-31T22:09:18Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Cajo, Ricardo A.
author
Zuñiga, Steve R.
author
Huilcapi, Víctor M.
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
In this paper an algorithm of spectral search in Azimuth and Elevation to obtain an optimal reception of RF signals in point-to-point radio links is described. An experimental mechanism that allows acquiring the radiation intensity in Azimuth and Elevation for various angular positions based on field sampling and measuring techniques, was built. These techniques provide a fast and simple method for acquiring data; software was developed to execute this measuring and spectral search procedure, which allows an efficient determination and space positioning in the located optimal point. An example of a radio link between two buildings with patch antennas aligned with the proposed mechanism was used, and the performance evaluated through the energy budget with theoretical well known models of propagation.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21337
Radioenlaces
Optimizacion
Modelo De Propagacion
Presupuesto Energetico
Campo Lejano
Tecnicas De Muestreo
Antena Patch
Mecanismo de posicionamiento en Azimut y Elevación para la optimización de radioenlaces punto a punto basado en algoritmos de búsqueda espectral y técnicas de muestreo
oai:dspace.ucuenca.edu.ec:123456789/213542020-07-31T22:09:19Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
La Cruz, Alexandra
author
Zeas P., Ana L.
author
Quishpi M., Estefanía A.
author
Campoverde V., Johanna L.
author
Guamán B., Heydi K.
author
Morocho, Villie
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
A photo-podoscope is a useful tool for assessing a footprint; it is performed by observing the supporting areas of the foot in standing position. This evaluation and diagnosis generally is made by a specialist, and without leaving medical evidence for future comparisons. Generally, this evaluation is made based on the form of the footprint by using a traditional podoscope or rudimentary process which carries several disadvantages. We present, a medical alternative equipment called JHECA NAWE photo-podoscope. This equipment allows assessment of a footprint in a fast an effective way with accurate diagnoses, including a record for future evaluations. Commercial equipment is expensive, reason why medical specialists prefer to use rudimentary processes. In order to evaluate clinically the effectiveness of JHECA NAWE, we analyzed a cross-sectional of attended patients by using this equipment in comparison with different medical specialist opinion.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21354
Analisis De La Huella Plantar
Foto-Podoscopio
Procesamiento De Imagenes
Postura Del Pie
Huella Del Pie
Clinical validation of footprint analysis using the low cost Photo-podoscope JHECA NAWE
oai:dspace.ucuenca.edu.ec:123456789/213652020-07-31T22:09:20Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Jaramillo A., Carolina E.
author
León V., Rubén D.
author
Lara C., Román A.
author
Benítez M., Diego S.
author
Ruiz, Mario
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
A study of the detection and characterization of volcano-tectonic seismic type of events, using a long period of records of the Cotopaxi volcano, is presented. The sequential detection structure, proposed as part of this work, allows maximizing the likelihood of the presence of an event and minimizes the absence of this from a seismic record. The detection is performed in the near real time domain, maintaining a constant false alarm rate, enabling in a later stage a more detailed study of the spectral content of the events using classical spectral estimators such as the periodogram and the parametric maximum entropy method by Burg. The approach enabled to categorize phenomenon detected as volcano-tectonic from a long record of observations which even include activities of non-tectonic origin, such as the other two types of lightning.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21365
Volcan Cotopaxi
Deteccion De Eventos Sismicos
Test De Hipotesis Binaria
Señales Sismo-Volcanicas
Sismos
Actividad Sismica
Caracterización de señales sísmicas del Volcán Cotopaxi utilizando estimadores espectrales clásicos y de máxima entropía
oai:dspace.ucuenca.edu.ec:123456789/213512020-07-31T22:09:20Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Torres, Felipe
author
Sánchez, Christian
author
Palacio Baus, Kenneth Samuel
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
Brain activity can be monitored through electroencephalography and used as a bioelectric indicator. This paper shows how a low cost device can be used in developing brain-computer interface based applications. The obtained results show that the MindWave device can be used for EEG signal acquisition, and that the Wavelet transform can be employed to improve the signal representation in order to apply artificial intelligence algorithms and pattern recognition techniques to classify brain responses.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21351
Electroencelografia
Ondas Cerebrales
Extraccion De Caracteristicas
Wavelet
Indicador Bioelectrico
Adquisición y análisis de señales cerebrales utilizando el dispositivo MindWave
oai:dspace.ucuenca.edu.ec:123456789/213482020-07-31T22:09:21Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Ramírez, Miguel
author
Colina, Eliezer
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
The production maximization of heavy and extra heavy oil wells is the main benefit to be obtained from the control systems that are currently operating on oil companies. Given the complex and changing nature over time of existing artificial lift methods for oil extraction, meeting the specifications set for the processing of crude using conventional regulatory control is a difficult task. Taking this into account, this paper presents an intelligent supervisory system that detects changes in the operating conditions of the production process and makes automatic adjustments in its set points. Furthermore, the proposed supervisory system has the ability to detect faults in the sensors involved in the control loops, thus ensuring reliable operation of the process. The proposed supervisory system was tested in a real oil well, yielding results that exceeded expectations.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21348
Sistema Supervisor Inteligente
Detector De Eventos
Modelo Cualitativo
Sistema De Toma De Decision
Deteccion De Fallos
Diagnostico De Fallos
Metodos De Levantamiento Artificial
Produccion Petrolera
Sistema supervisor inteligente para procesos de producción de petróleo
oai:dspace.ucuenca.edu.ec:123456789/213452020-07-31T22:09:21Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Tusa, Eduardo
author
Villegas, Hyxia
author
Reynolds, Alan
author
Lane, David M.
author
Robertson, Neil M.
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
This work focuses on the implementation of a fast coral reef detector that is used for an Autonomous Underwater Vehicle (AUV, its acronym in English). A fast detection of the presence of coral ensures the AUV stabilization in front of coral reef in the shortest possible time, avoiding collisions with coral. The coral detection is carried out on an image that captures the scene that the AUV’s camera perceives. A pixel-by-pixel classification is performed between two classes: coral reef and the background that is non-coral reef. Each pixel of the image is assigned to a feature vector, which is generated by using Gabor Wavelet filters. These are implemented in C++ and the OpenCV library. The feature vectors are classified using nine machine learning algorithms. The performance of each algorithm is compared with the accuracy and execution time. The Decision Tree algorithm proved to be the fastest and most accurate of all the algorithms. We created a database of 621 images of coral reefs in Belize (110 of training images and 511 of testing images).
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21345
Arrecife De Coral
Maquinas De Aprendizaje
Filtros Gabor Wavelets
Opencv
Autonomous Underwater Vehicle
Implementación de un detector de coral utilizando filtros Gabor Wavelets y máquinas de aprendizaje
oai:dspace.ucuenca.edu.ec:123456789/213362020-07-31T22:09:22Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Rojas, Rubén D.
author
Garcia-Gabin, Winston
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
This paper presents a novel identification method for non-minimum phase systems based on the step response. The proposed approach provides a linear second-order model approximation avoiding complex experimental design. The proposed method is a closed identification algorithm based on characteristic points of the second order non minimum phase system step response. It is validated using different linear models. They have inverse response between 3,5% and 38% of the final steady state response. In simulations, it has been shown that satisfactory results can be obtained using the proposed identification procedure, where the identified parameters present mean relative errors lower than those obtained by Balaguer’s method.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21336
Identificacion
Respuesta Escalon
Sistemas De Fase No Minima
Escalon
Modelos Lineales
Nuevo método de identificación usando la respuesta escalón para sistemas de fase no mínima de segundo orden
oai:dspace.ucuenca.edu.ec:123456789/213302024-02-05T12:51:34Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Erazo P., Jennyfer K.
author
Hervas P., Carlos A.
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
2014
This document describes the use of Zigbee via Arduino technology. These technologies have enabled the development of a system called Natura Sys. The system consisting of sensor motes is able of receiving environmental information such as temperature, humidity and presence of smoke. All information is centralized by a central base connected wireless with the sensors. The information is visualized by a desktop application providing a warning if in a given area of the forest there is a fire. The desktop application contains also a website in which statistical reports of the monitored parameters in the forest area are visualized.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21330
Incendio forestal
Prevención
Tecnología
Sistema tecnológico
Medio ambiente
Sistema de detección de incendios forestales mediante redes sensoriales inalámbricas (Zigbee)
oai:dspace.ucuenca.edu.ec:123456789/213632020-07-31T22:09:23Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Jumbo Pacheco, Pablo Xavier
author
Nieto Monteros, Diego Alejandro
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
Cyanide is a chemical compound used per excellence for gold leaching in the mining industry. However, it is highly toxic for the environment and its organisms. This work focused on determining the optimum conditions for the degradation of CN- using chemical compounds and a microbial consortium. Chemical and biological assays were performed separately using samples of mining effluents at different cyanide concentrations (280 and 10 mg/l CN-). For chemical degradation, three different oxidizing compounds were used: sodium hypochlorite, Caro’s acid and hydrogen peroxide at different concentrations, pH (10-11), and degradation times (4,71 and 20,75 h). For the biodegradation assays, a microbial consortium was cultivated in flasks containing the cyanide effluent, liquid medium, pH (11), agitation (200 rpm) and temperature (20±5°C). Free cyanide concentration, pH and the biomass concentration were measured. Chemical treatment results showed that the best oxidizing compound was hydrogen peroxide (8:1 g H2O2/g CN-) and pH (10), thus obtaining a 92,7% removal of free cyanide in 45 minutes (280 mg/l CN-) and 91,0% removal in 25 minutes (10 mg/l CN-). While in biodegradation the removal was 73,7% (280 mg/l CN-) in 384 h and 78,6% (10 mg/l CN-) in 240 h.
http://dspace.ucuenca.edu.ec/handle/123456789/21363
Biodegradacion
Cianuro
Consorcio Microbiano
Peroxido De Hidrogeno
Efluente Minero
Tratamiento químico y biológico de efluentes mineros cianurados a escala laboratorio
oai:dspace.ucuenca.edu.ec:123456789/213392020-07-31T22:09:23Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Astudillo S., Darwin
author
Barros G., Juan Gabriel
author
Chaput, Emmanuel
author
Beylot, André-Luc
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
In the context of vehicular networks a map updating application was analyzed, which enables vehicles to download relevant geographic data related to their position. Possible strategies for data sharing are the networks from infrastructure to a vehicle (I2V) and from vehicle to vehicle (V2V). In this study two chunking techniques, the Random Sort Strategy (RSS) and the Network Coding (NC), for the I2V network segment were compared. The study revealed that the distribution of different received chunks is independent of the file size when NC is used; when RSS is used the mean and standard deviation depend on the file size. The authors intend to integrate in a next step these results in the analysis of the V2V network segment.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21339
Comunicacion Vehicular
Vanet
Actualizacion De Mapas
Network Coding
Random Sort Strategy
Red Vehicular
Analyzing downloaded data from road side units
oai:dspace.ucuenca.edu.ec:123456789/213582020-07-31T22:09:24Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Pérez, María G.
author
Conci, Aura
author
Aguilar, Aida
author
Sánchez, Angel
author
Andaluz, Víctor H.
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
Breast cancer is one of the most common cancer types among women in Quito, Ecuador. Although, awareness campaigns and researches have led to improved diagnosis and treatment, in less developed countries it still is an unresolved problem due to the diagnosis only in advanced stages and the lack of resources enabling early detection. In Ecuador, for example, about four out of ten women diagnosed with breast cancer are in advanced stages (III and IV), whose treatment is costly and complex. The World Health Organization (WHO) states that screening programs are the more efficient way to combat this disease. Therefore it is fundamental to address new researches on early detection that are cost-effective and present advantages over the current method (based on the self-examination and mammography). The identification of such disease in early stage increases the prognosis and the survival rate. This article proposes a technique to incorporate low-cost, non-invasive early diagnosis based on the use of thermal.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21358
Procesamiento De Imagenes
Termografia
Radiacion
Metabolismo
Tamizaje
Deteccion Precoz
Segmentacion De Imagenes
Analisis De Textura
Extraccion De Caracteristicas
Cuantificacion De Region De Interes
Cancer De Mama
Detección temprana del cáncer de mama mediante la termografía en Ecuador
oai:dspace.ucuenca.edu.ec:123456789/213672020-07-31T22:09:25Zcom_123456789_5372com_123456789_33353col_123456789_21328
00925njm 22002777a 4500
dc
Chang, Carolina
author
Universidad de Cuenca
author
Dirección de Investigación de la Universidad de Cuenca
author
DIUC
author
2014
This paper describes a real plant that features an intelligent vehicle. The plant navigates through indoor environments, responds to environmental stimuli, interacts with humans through augmented reality, detects fire, and asks for help via Twitter. Experiments show that there are no false positives in the detection of fire, and that the detection of fire is greater than 50%, for distances along the sight line between the flames and the sensor of less than 5 m. Communication by XBee radios in indoor environments is effective up to 25 m at least.
1390-6143
http://dspace.ucuenca.edu.ec/handle/123456789/21367
Robot Movil
Deteccion De Fuego
Realidad Aumentada
Evitacion De Obstaculos
Twitter
Bioleta Mata: una planta que interactúa por medio de realidad aumentada