Time filter

Source Type

Morales D.X.,Catholic University of Cuenca | Icaza D.,Catholic University of Cuenca | Flores P.,Catholic University of Cuenca | Conce F.,Catholic University of Cuenca | And 3 more authors.
2016 IEEE International Conference on Automatica, ICA-ACCA 2016 | Year: 2016

This paper aims to determine and identify the best technical placement for fault locators - FLs - on the distribution network, in order to improve the reliability in the system. The international indices such as SAIFI and SAIDI are evaluated in two scenarios; the first one analyze the power system in its current configuration whereas the second one assumes that FLs are installed in different places. A case study composed of three feeders from Galapagos Islands is analyze, considering different cases with one, two and three FLs. © 2016 IEEE.


Morales D.X.,Catholic University of Cuenca | Icaza D.,Catholic University of Cuenca | Lliguin L.,Catholic University of Cuenca | Melgar S.,Catholic University of Cuenca | Vimos V.A.,Salesian Polytechnic University
2016 IEEE International Conference on Automatica, ICA-ACCA 2016 | Year: 2016

This paper aims to determine the acceptability of residential electric vehicle (EV) on distribution system networks. Since, in Ecuador the last year has been an important impulse for changing the conventional vehicles for electric ones, the government is launching new policies in order to foster the CO2 reductions by some alternatives; the first one considers deploying in the medium term EV in the main cities, the initiative will start changing vehicles in the public enterprises. In this paper, a study based in surveys to forecast the real EV penetration and its impacts into the distribution transformer is presented. © 2016 IEEE.


Minchala L.I.,University of Cuenca | Ochoa S.,University of Cuenca | Velecela E.,University of Cuenca | Astudillo D.F.,University of Cuenca | Gonzalez J.,Catholic University of Cuenca
IEEE Latin America Transactions | Year: 2016

The computer integrated manufacturing (CIM) approach allows the possibility to remotely and optimally control the entire production process in a plant. The implementation of CIM architectures demands the installation of several software platforms, which most of the cases are commercial and have high licensing prices. This research presents the development of an open software architecture for advanced CIM (OSACIM) by using two open software development platforms: Java and Python. The use of open software in the development of this solution allows the creation of a low price CIM approach. The results of using the system in laboratory tests show good results in comparison with commercial softwares for developing OPC communications and SCADA systems, which perform similar functionalities as the proposed OSACIM. The main features and limitations of the system are reported. © 2016 IEEE.


Shuracpamba, a colonial farm located in southern Ecuador, has remained in anonimity. With the aim of making some of the particularities of this architectural complex; tasks such as bibiliographic research and in situ recognition of the preserved building have been carried out. This research is one of the few texts that addresses the object and some of its multiple dimensions, although partially, by constructing its historical and historical-constructive sequence, and tying them in with some social and historical connections. Additionally, this is the first research to test the statigraphic constructive methodological analysis by evidencing five building campaigns, materials and techniques used. © 2016 CSIC.


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.


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.


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.


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.

Loading Catholic University of Cuenca collaborators
Loading Catholic University of Cuenca collaborators