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Ortiz-Benavides R.E.,Catholic University of Cuenca | Anez-Ramos R.,University of Zulia | Salazar-Vilchez J.,University of Zulia | Rojas-Quintero J.,University of Zulia | Bermudez-Pirela V.,University of Zulia
Revista Peruana de Medicina Experimental y Salud Publica | Year: 2016

Objectives. To determine the risk factors for arterial hypertension (HTN) in the adult resident population of the city of Cuenca, Ecuador. Materials and methods. A cross-sectional analytical study of adults selected via multistage random sampling who underwent clinical, anthropometric, and laboratory evaluations. The diagnosis of HTN was defined according to the JNC-7 criteria. A multiple logistic regression model was performed. Results. A total of 318 persons were included. The prevalence of HTN was 25.8% (males: 27.2% vs. females: 24.7%; p = 0.617). In the multiple logistic regression model, the risk factors for HTN were age > 60 years (OR, 8.68; 95% CI, 3.56-21.14; p < 0.001), obesity according to body mass index (OR, 2.36; 95% CI, 1.04-5.70; p = 0.042), high caloric intake (OR, 2.06; 95% CI, 1.01-4.53; p = 0.044), and family history of HTN (OR, 1.58; 95% CI, 1.02-2.90; p = 0.040). Conclusions. The presence of HTN in this population is associated with both intrinsic and environmental factors, which should be considered in routine evaluations to ensure its early identification and control. © 2016, Instituto Nacional de Salud. All rights reserved.


Minchala-Avila L.I.,University of Cuenca | Reinoso-Avecillas M.,ASK Solutions | Sanchez C.,University of Cuenca | Mora A.,UCEM | And 2 more authors.
10th Annual International Systems Conference, SysCon 2016 - Proceedings | Year: 2016

This paper presents the methodology of design of three different modeling techniques for predicting cement quality using input-output measurements of the closed circuit grinding in a cement plant. The modeling approaches used are: statistical, artificial neural networks (ANN), and adaptive neuro-fuzzy inference systems (ANFIS). The data set for generating the predictive models are obtained from a database of the operation of the cement plant, UCEM-Guapan. An OPC (OLE for process control) network configuration in the SCADA system allows online validations of the proposed models in order to select the best approach for real-time prediction of cement quality. © 2016 IEEE.


Reinoso M.,University of Cuenca | Minchala L.I.,University of Cuenca | Ortiz J.P.,Salesian Polytechnic University | Astudillo D.,University of Cuenca | Verdugo D.,Catholic University of Cuenca
IEEE Latin America Transactions | Year: 2016

This paper presents the design of a sliding mode control (SMC) for trajectory tracking of an unmanned aerial vehicle (UAV), quadrotor. A simplified model of the quadrotor is used for the controller design. The robustness of the controller is verified through simulations, and also through data analysis from the experiments in the 3DR Arducopter platform. The SMC algorithms are implemented in a microcontroller that communicates with a human machine interface (HMI), which monitors the behavior and stability of the state variables. The results show effectiveness of the control technique for maintaining stability in the quadrotor under different operating scenarios. © 2016 IEEE.


Qin F.,CAS Technical Institute of Physics and Chemistry | Qin F.,University of Chinese Academy of Sciences | Xue Q.,China First Automobile Works Group Corporation | Albarracin Velez G.M.,Catholic University of Cuenca | And 5 more authors.
Energy Conversion and Management | Year: 2015

Since the performance of conventional air source heat pump (ASHP) for electric vehicles (EVs) is apt to decline sharply in low ambient temperature, it will consume more electricity of the cell, and affect driving mileage in cold regions. Aiming at developing high efficiency heating system for EVs in cold regions, an ASHP system applying refrigerant injection for EVs is designed, as well as the test bench is built to investigate its performance. According to the operation condition of EVs, heating performances are tested on different in-car inlet air temperature and various fresh air ratios under -20. °C ambient temperature. The system cycle process with refrigerant injection, as well as the influences of refrigerant injection and dryness are also analyzed and discussed. The results show that the heating capacity of the ASHP with refrigerant injection can be increased up to 31%, and in comparison with the conventional heat pump system its heating performance is better when in-car inlet temperature is above -10. °C. Therefore, ASHP with refrigerant injection has great potentiality to be applied for the EVs in cold regions. © 2015 Elsevier Ltd.


Gamez B.,Catholic University of Cuenca | Cabrera M.,Catholic University of Cuenca | Serpa L.,Catholic University of Cuenca | Cabrera J.,Catholic University of Cuenca
Proceedings - 2015 Asia-Pacific Conference on Computer-Aided System Engineering, APCASE 2015 | Year: 2015

The design of a distal extremity prosthesis (right hand) based on the anthropometric measures of a 10-year old child is presented. Each finger is disposed in two sections, a fusion of the middle and distal phalanx, and a proximal phalanx articulated to the hand palm. The angles of the movement for the extension and flexion of all fingers, except the thumb, are controlled by a link located sideways. The drive system, that generates three degrees of freedom to execute the cylindrical grasp's functions, the precision grasp, hook prehension and the extended index finger, is based on three linear actuators located on the palm, which have a reference potentiometer that provides its position, such indication is used by the microcontroller via the analogic input signal. To validate the design, a stresses and displacements analysis, and the determination of the safety factor that offers the device for the selected materials is carried out, using a computer program based on the Finite Element Method. The results obtained show a light prosthetic device that weights 150 grams, and can operate safely allowing four grip functions with the normal angles of the hand. © 2015 IEEE.


Rojas Alvarez E.,Hospital Clinico Quirurgico Abel Santamaria Cuadrado | Rojas Alvarez E.,Catholic University of Cuenca | Gonzalez Sotero J.,Hospital Clinico Quirurgico Abel Santamaria Cuadrado | Gonzalez Sotero J.,Catholic University of Cuenca | And 2 more authors.
Archivos de la Sociedad Espanola de Oftalmologia | Year: 2015

Abstract Objective To develop corneal morphometric models with refractive error in excimer laser surgery. Method A prospective-longitudinal study was conducted on 78 patients (151 eyes) using the LASIK surgical technique, and 56 patients (111 eyes) with myopic astigmatism using ESIRIS (Schwind-Germany) equipment with pendulous microkeratome. The results were analyzed using descriptive statistics. A NIDEK Confoscan microscope was used to obtain and study the images. Results After LASIK treatment 84.3% of the variations in epithelium thickness variations were due to the magnitude of refractive error and the epithelium thickness before LASIK treatment. More than two-thirds (68.8%) of the variations in keratocyte density variations in posterior flap and 48.2% of the variations in the anterior retroablation zone were due to the magnitude of the refractive error. Variations of 90% were found in the corneal thickness after LASEK, which were due to the magnitude of the refractive error before LASEK. Conclusions Predictive models reveal that morphometrical variations depend of the magnitude of the refractive error. These models are very important in the selection of patient for refractive surgery, and also for the specific technique to use. © 2013 Sociedad Española de Oftalmología.


Cardenas Cantos L.,Catholic University of Cuenca | Lopez Izquierdo J.,Catholic University of Cuenca | Cardenas Cantos E.,Catholic University of Cuenca
IEEE Latin America Transactions | Year: 2016

This article presents an Interactive Multimedia Application developed as an alternative support for education professionals and students Race of Engineering Grade in which it requires make use of different branches of mathematics, with specific focus on analytic geometry, allowing greater agility and quickness on the understanding abstract concepts. This Interactive Multimedia Application was developed through the study of various didactic methods and teaching and learning resources used in the classroom and that lead to loss of motivation by part the students to assimilate meaningful learning topics; therefore, this project is conceived as an additional teaching strategy to the existing ones, on which it tends to place greater emphasis on autonomous work and so try improve academic performance. © 2016 IEEE.


Objective: To describe variations of corneal morphometric haze, in surface Excimer Laser treatment, and its relationship with the ametropy magnitude. Method: A prospective, longitudinal observational and descriptive research was carried out in 56 patients (111 eyes) who underwent of myopic astigmatism LASEK surgical technique, with Mitomycin. We used the confocal microscope NIDEK 4 Confoscan for the collection and analysis of the images. Data were processed through the program SPSS 21.0, ANOVA for repeated measurements for a factor with the confidence interval adjustment by Bonferroni, Pearson correlation and linear regression model. Results: Significant direct correlation between the thickness of the corneal haze and the magnitude of the ametropy was obtained. Higher value of this variable, it is the thickness of the retrieved corneal haze, and there is more correlation to the three months of operation. The value of R2 retrieved is not optimal. Only 39% of the corneal haze variations are dependent on the magnitude of the treated ametropy. Conclusions: The corneal haze thickness obtained in patients who underwent surgery with Excimer Laser through the LASEK technique, is dependent on the magnitude of the ametropy, and acquires its greatest value at 3 months postoperative. The magnitude of the ametropy is not the only factor influencing haze thickness. In transparent corneas in the postoperative of LASEK, always there is some degree of morphometric corneal haze. © 2016 Sociedad Mexicana de Oftalmología.


Catholic University of Cuenca | Entity website

La Constitucin de la Repblica (2008), en su artculo 297 expresa que todo programa financiado con recursos pblicos tendr objetivos, metas y un plazo predeterminado para ser evaluado, en el marco de lo establecido en el Plan Nacional de Desarrollo. Las instituciones y entidades que reciban o transfieran bienes o recursos pblicos se sometern a las normas que las regulan y a los principios y procedimientos de transparencia, rendicin de cuentas y control pblico ...


PubMed | Catholic University of Cuenca
Type: Journal Article | Journal: Archivos de la Sociedad Espanola de Oftalmologia | Year: 2015

To develop corneal morphometric models with refractive error in excimer laser surgery.A prospective-longitudinal study was conducted on 78 patients (151 eyes) using the LASIK surgical technique, and 56 patients (111 eyes) with myopic astigmatism using ESIRIS (Schwind-Germany) equipment with pendulous microkeratome. The results were analyzed using descriptive statistics. A NIDEK Confoscan microscope was used to obtain and study the images.After LASIK treatment 84.3% of the variations in epithelium thickness variations were due to the magnitude of refractive error and the epithelium thickness before LASIK treatment. More than two-thirds (68.8%) of the variations in keratocyte density variations in posterior flap and 48.2% of the variations in the anterior retroablation zone were due to the magnitude of the refractive error. Variations of 90% were found in the corneal thickness after LASEK, which were due to the magnitude of the refractive error before LASEK.Predictive models reveal that morphometrical variations depend of the magnitude of the refractive error. These models are very important in the selection of patient for refractive surgery, and also for the specific technique to use.

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