Person:
Vanegas Peralta, Pablo Fernando

Birth Date

1972-05-28

ORCID

0000-0003-3418-7670

Scopus Author ID

25522712400

Afiliación

Universidad de Cuenca, Cuenca, Ecuador
Universidad de Cuenca, Departamento de Ciencias de la Computación, Cuenca, Ecuador
Universidad de Cuenca, Departamento de Espacio y Población, Cuenca, Ecuador
Universidad de Cuenca, Facultad de Ciencias Químicas, Cuenca, Ecuador
Universidad de Cuenca, Departamento de Ingeniería Eléctrica, Electrónica y Telecomunicaciones(DEET), Cuenca, Ecuador
KU Leuven (Katholieke Universiteit Leuven), Leuven, Bélgica

País

Ecuador

Organizational Units

Organizational Unit

Facultad de Ingeniería

La Facultad de Ingeniería, a inicios de los años 60, mediante resolución del Honorable Consejo Universitario, se formalizó la Facultad de Ingeniería de la Universidad de Cuenca, conformada por las escuelas de Ingeniería Civil y Topografía. Esta nueva estructura permitió una mayor especialización y fortalecimiento en áreas clave para el desarrollo regional. Cuenta con programas académicos reconocidos internacionalmente, que promueven y lideran actividades de investigación. Aplica un modelo educativo centrado en el estudiante y con procesos de mejora continua. Establece como prioridad una educación integra, la formación humanística es parte del programa de estudios que complementa a la sólida preparación científico-técnica. Las actividades culturales pertenecen a un programa permanente y activo al interior de nuestras dependencias, a la par de proyectos que desde el alumnado y bajo la supervisión de docentes cumplen con servicios de apoyo a nivel local y regional; promoviendo así una vinculación estrecha con la comunidad.

Job Title

Profesor (T)
Rector de la Universidad de Cuenca (2016 - 2021)
Decano de la Facultad de Ingeniería de la Universidad de Cuenca
Subdecano de la Facultad de Ingeniería de la Universidad de Cuenca
Vicerrector de Investigación y Posgrado en la Escuela Superior Politécnica de Chimborazo (ESPOCH) (2021 - )

Last Name

Vanegas Peralta

First Name

Pablo Fernando

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Search Results

Now showing 1 - 10 of 24

Optical Flow as a Tool for Cardiac Motion Estimation
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2015-07-14) Medina Molina, Ruben; Morocho Zurita, Carlos Villie; Vanegas Peralta, Pablo Fernando
A sparse based algorithm for optical flow estimation is presented and compared with several classical optical flow estimation algorithms. The comparison is performed using several video sequences available from the Middlebury benchmark where the ground truth optical flow is known. The sparse algorithm attains competitive results with average angular errors as low as 2.09° and average magnitude errors as low as 0.100. The algorithms are also tested using a 4 - D cardiac Magnetic Resonance Image (MRI) sequence. The sparse algorithm estimates an optical flow field that represents the motion of contraction during the systole interval.
Artificial neural networks applied to flow prediction: A use case for the Tomebamba river
(Elsevier Ltd, 2016) Veintimilla Reyes, Jaime Eduardo; Cisneros Espinoza, Felipe Eduardo ; Vanegas Peralta, Pablo Fernando; Veintimilla Reyes, Jaime Eduardo
The main aim of this research is to create a model based on Artificial Neural Networks (ANN) that allows predicting the flow in Tomebamba river, at real time and in a specific day of a year. As inputs, this research is using information of rainfall and flow of the stations along of the river. This information is organized in scenarios and each scenario is prepared to a specific area. For this article, we have selected two scenarios. The information is acquired from the hydrological stations placed in the watershed using an electronic system developed at real time and it supports any kind or brands of this type of sensors. The prediction works very good three days in advance. This research includes two ANN models: Backpropagation and a hybrid model between back propagation and OWO-HWO (output weight optimization–hidden weight optimization) to select the initial weights of the connection. These last two models have been tested in a preliminary research. To validate the results we are using some error indicators such as MSE, RMSE, EF, CD and BIAS. The results of this research reached high levels of reliability and the level of error is minimal. These predictions are useful to avoid floods in the city of Cuenca in Ecuador.
An educative environment based on ontologies and e-learning for training on design of speech-language therapy plans for children with disabilities and communication disorders
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-11-30) Chuchuca-Mendez, F; Vanegas Peralta, Pablo Fernando
Nowadays several developing countries must to face several problems related with the lack of personnel, resources or adequate health-care structures to attend children with disabilities and communication disorders. Some studies of the World Health Organization (WHO) and other organizations point that in some countries of Africa exists one Speech-Language Pathologist (SLP) per each 2 to 4 million people, whereas in developed countries like United States or Australia the ratio is much higher: One SLP per each 2500 to 4700 people. For these reasons, in this paper we propose an intelligent educative environment aimed to support the training and development of practice skills of the future SLPs. Our proposal relies on ontologies and several e-learning modules and at the moment is able to support the learning process of designing therapy plans. Currently, the ontology that we have designed contains more than 1,005 instances and two tests to evaluate the articulation, and hearing skills on children.
Fabrication of 3D bioactive ceramic scaffolds by robocasting
(SPRINGER VERLAG, 2014-10-29) Andrade Cabrera, Santiago Patrico; Abdalla, A; Vanegas Peralta, Pablo Fernando
Tricalcium phosphate ceramics are bioactive and osteoconductive biomaterials that support cellular functions and can develop appropriate mechanical characteristics for bone tissue engineering. Fast prototyping techniques permit to obtain accurate control over scaffolding architecture with high reproducibility. Flexible composites are considered to promote mechano-biological stimulation during cell culture. The aim of this study is to fabricate flexible bioceramic scaffolds by robocasting and to determine biological improvements related to their added flexible properties. Characterized 3D ? - TCP/gelatin scaffolds with interconnected porous structure were fabricated using robocasting. SEM micrographs showed fabricated porous scaffolds with desired pore size (~200 ?m), rods diameter (~840 ?m), porosity and mechanical strength. Alamar Blue assay was performed for static and dynamic cultures along 21 days. Oscillatory flow conditions allowed considerable higher cell proliferation compared with static conditions.
A procedure for semi-automatic segmentation in OBIA based on the maximization of a comparison index
(SPRINGER VERLAG, 2014-06-30) Auquilla Sangolquí, Andrés Vinicio; Vanegas Peralta, Pablo Fernando
In an Object Based Image Analysis Classification (OBIA) process, the quality of the classification results are highly dependent on segmentation. However, a high number of the studies that make use of an OBIA process find the segmentation parameters by making use of trial-and-error methods. It is clear that a lack of a structured procedure to determine the segmentation parameters produces unquantified errors in the classification. This paper aims to quantify the effects of using a semi-automatic approach to determine optimal segmentation parameters. To this end, an OBIA process is performed to classify land cover types produced by both a manual and an automatic segmentation. Even though the classification using the manual segmentation outperforms the automatic segmentation, the difference is only 2%. Since the automatic segmentation is performed with optimal parameters, a procedure to accurately determine those parameters must be performed to minimize the error produced by a misjudgment in the segmentation step. © 2014 Springer International Publishing.
Level set algorithms comparison for multi-slice CT left ventricle segmentation
(SPIE, 2015-11-17) Medina Molina, Ruben; La Cruz Puente Alexandra; Morocho Zurita, Carlos Villie; Ordoñes, A; Pesántez, D; Vanegas Peralta, Pablo Fernando
The comparison of several Level Set algorithms is performed with respect to 2D left ventricle segmentation in Multi-Slice CT images. Five algorithms are compared by calculating the Dice coefficient between the resulting segmentation contour and a reference contour traced by a cardiologist. The algorithms are also tested on images contaminated with Gaussian noise for several values of PSNR. Additionally an algorithm for providing the initialization shape is proposed. This algorithm is based on a combination of mathematical morphology tools with watershed and region growing algorithms. Results on the set of test images are promising and suggest the extension to 3{D MSCT database segmentation.
Compactness and flow minimization requirements in reforestation initiatives: A heuristic solution method
(KLUWER ACADEMIC PUBLISHERS, 2014-01-01) Vanegas Peralta, Pablo Fernando; Wijffels Anja, Louisa María
A heuristic solution method to identify a predefined number of cells in raster maps optimizing both multiple intrinsic cell characteristics and cell patch compactness (Vanegas et al. in Lect. Notes Comput. Sci. 5072:389-404, 2008), is extended so that also spatial interaction is taken into account. Spatial interaction is e.g., present in the flow of sediment between cells in a rasterised watershed as modified by the presence or absence of tree cover in a given cell. The resulting HLC-method is elaborated and tested in the context of a site location problem for reforestation in which the following criteria are considered: (1) the sediment flow reaching the outlet of the watershed is minimized, (2) two intrinsic environmental performances of the cells are maximized/minimized, and (3) the selected cells form a compact patch. To evaluate the performance of the HLC, its results are compared to the ones obtained with an Integer Programming (IP) formulation. This comparison suggests that the HLC identifies high quality, near-to-optimal patches of cells and that its computational efficiency makes it applicable to regional sized cases. © 2011 Springer Science+Business Media, LLC.
TiO2 nanorods coated onto nylon 6 nanofibers using hydrothermal treatment with improved mechanical properties
(ELSEVIER B.V., 2014-09-05) Abdal-Hay, A; Vanegas Peralta, Pablo Fernando
Well-aligned arrays TiO2 nanorods were deposited onto electrospun nylon 6 (N6) nanofibers. The complete coverage of individual fiber surfaces with TiO2 nanorods occurred in a very short time using a cost effective hydrothermal technique. The results demonstrate that organic molecule substrates have a considerable influence on nucleation and precipitation mechanism and uniform distribution behaviors of TiO2 onto N6 nanofibers surface with good interfacial adhesion between the components. N6 decorated with large number TiO2 nanorods showed good hydrophilicity. Significant improvement in mechanical properties like tensile strength and modulus of the TiO2/N6 composite membrane mats in comparison to the pristine N6 mats was observed by applying just 2h reaction process. The resultant TiO2/N6 spider-net like composite mat with good hydrophilicity may be a potential candidate for future water filter applications, and its improved mechanical will also make it a potential candidate for protective clothing. © 2014 .
Cardiac Motion Estimation in Magnetic Resonance Images Using Optical Flow
(IEEE COMPUTER SOCIETY, 2016-06-01) Medina Molina, Ruben; Morocho Zurita, Carlos Villie; Vanegas Peralta, Pablo Fernando
This paper reports an optical based method for quantification of cardiac motion in MRI images. The cardiac motion is quantified in a Short-Axis (SAX) slice located at the mid-cavity of the left ventricle. In this slice, the left ventricle wall is segmented for extracting the endocardium, the epicardium and the midwall. The velocity field for these contours is available after performing the optical flow estimation for the given slice. Post-processing of this motion field enables estimation of the radial displacement. The core of this cardiac motion quantification method is a sparse based algorithm for optical flow estimation. This algorithm is presented and compared with several classical optical flow estimation algorithms. The comparison is performed using several video sequences available from the Middlebury benchmark where the ground truth optical flow is known. The algorithms with better performance are also tested using a 4 D cardiac Magnetic Resonance Image (MRI) sequence. Results show that he sparse algorithm estimates an optical flow field that represents the motion of contraction during the systole interval. Moreover, results about radial displacement estimation on real MRI sequences for a normal subject and a patient with hypertrophy show that the proposed quantification method could be useful for quantification of left ventricle motion.
Aplicación de servicios web estándares para el monitoreo hidrometeorológico automático, integrando información de sensores diversos mediante ontologías
(2018) Veintimilla Reyes, Jaime Eduardo; Vanegas Peralta, Pablo Fernando; Estrella Maldonado, René Gustavo
The last developments in worldwide technology and the continuous growth in telecommunications have resulted in the requirement to make available the information generated by a number of devices, especially for those that incorporate sensors, with the goal of reacting to any relevant events that could occur. The latest advances in this area have resulted in the development of several devices with heterogeneous types and from different vendors. This paper presents a proposal for an architecture that integrates several standard web services for the compilation, organization and storage of the information generated by a network of hydrometeorology sensors. Likewise, the paper proposes the application of standard services for controlling remotely these sensors and for managing events and generating early warnings. The aforementioned web services are some examples of the set of services that form the Sensor Web Enablement standard. Considering the diversity, both in type and vendor, that is typically found among the stations and sensors in a hydrometeorology monitoring network, this paper additionally proposes the application of ontologies with the goal of homogenizing and integrating the information coming from this diverse infrastructure.