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

Full item page

Search Results

Now showing 1 - 10 of 24

ECG Multilead QT interval estimation using support vector machines
(2019) Dugarte, Nelson; Medina, Ruben; Cuadrado, Jhosmary; Morocho Zurita, Carlos Villie; Vanegas Peralta, Pablo Fernando
This work reports a multilead QT interval measurement algorithm for a high-resolution digital electrocardiograph. The software enables off-line ECG processing including QRS detection as well as an accurate multilead QT interval detection algorithm using support vector machines (SVMs). Two fiducial points ( and ) are estimated using the SVM algorithm on each incoming beat. This enables segmentation of the current beat for obtaining the P, QRS, and T waves. The QT interval is estimated by updating the QT interval on each lead, considering shifting techniques with respect to a valid beat template. The validation of the QT interval measurement algorithm is attained using the Physionet PTB diagnostic ECG database showing a percent error of with respect to the database annotations. The usefulness of this software tool is also tested by considering the analysis of the ECG signals for a group of 60 patients acquired using our digital electrocardiograph. In this case, the validation is performed by comparing the estimated QT interval with respect to the estimation obtained using the Cardiosoft software providing a percent error of .
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.
In vitro deposition of Ca-P nanoparticles on air jet spinning Nylon 6 nanofibers scaffold for bone tissue engineering
(ELSEVIER, 2014-07-15) Abdal-Hay, A; Vanegas Peralta, Pablo Fernando
Microporous, non-woven nylon 6 (N6) scaffolds were prepared with an air jet spinning (AJS) approach. In this process, polymer fibers with diameters down to the nanometer range (nanofibers) were formed by subjecting a fluid jet to high pressure air. The effects of the solution conditions on the morphological appearance and average diameter of the as-spun N6 fibers and crystal structure were investigated. The morphological properties of the AJS membrane mats could easily be tailored by adjusting the concentration of the polymer solution. Solutions at high concentrations were necessary to form well-defined fibers without beads. The production rate (viz. solvent evaporation rate) had the greatest effect on the chain structure conformation of N6. The predominant structure phase of the N6 fibers fabricated by AJS was a thermodynamically stable ?-form while the electrospinning fibers induced the metastable ?-form. AJS significantly enhanced the mechanical properties of the N6 mat. The bone formation ability of AJS fibers was evaluated by incubating the fibers in biomimetic simulated body fluid for 5 and 10 days at 37 °C. Overall, the new AJS approach developed for membrane structures has great potential for the fabrication of hard and soft tissue engineering scaffolds. © 2014 Elsevier B.V. All rights reserved.
Left ventricle myocardium segmentation in multi-slice computerized tomography
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-10-19) Bautista Llivisaca, Mateo Sebastian; Morocho Zurita, Carlos Villie; Vanegas Peralta, Pablo Fernando
This paper briefly describes a left ventricle myocardium segmentation method in multi-slice computerized tomography images. The segmentation technique is based on level-sets deformable contours. The proposed method has two stages: in the first stage the left ventricle internal wall or endocardium is segmented. In the second stage the external wall is segmented starting with an initialization based on the endocardial segmented shape. This algorithm is intended for incorporation within a software platform for visualization and processing of cardiac images. This platform would help the diagnosis of the left ventricle hypertrophy (LVH).
Preparation and characterization of vertically arrayed hydroxyapatite nanoplates on electrospun nanofibers for bone tissue engineering
(ELSEVIER, 2014-10-15) Abdal-Hay, A; Vanegas Peralta, Pablo Fernando
The aim of this study is to develop a facile and an efficient approach for providing the electrospun nanofibers scaffold with a vertically well-aligned and homogeneous distribution of hydroxyapatite (HA) nanoplates that coat the scaffold while maintaining its fibrous and porous structure. Crystal growth of HA nanoplates from a colloidal solution onto the surface of nylon (N6) nanofibers was carried out via a hydrothermal approach. The factors affecting the scaffold's morphology, macrostructure and the interfacial bonding between the constituents as well as the influence of crystal size were characterized and well elucidated. The results revealed that the deposition of dense and thick uniform nanoplates was perpendicular and nucleated in a parallel configuration onto the longitudinal axes of the individual nanofibers during the treatment process. The sizes of the nanoplates, which are strongly dependent on the reaction time, were 30 and 95. nm in length, with thicknesses of 17-19. nm, after 2 and 3. h respectively. The nanoplates improve the mechanical properties of the HA/N6 biocomposite scaffolds. The surface properties of the fabricated scaffolds appeared to have a greater effect on the early stages of osteoblast behavior (cell attachment and proliferation). The cells attached, grew and proliferated faster on culture-coated scaffolds in comparison with the pristine ones. Our results indicate that the treated scaffolds fulfill the basic requirements of bone tissue engineering scaffolds, and have the potential to be applied in orthopedic and reconstructive surgeries. © 2014 Elsevier B.V.
Factores que influyen en la selección de energías renovables en la ciudad
(2019) Barragán Escandón, Edgar Antonio; Zalamea León, Esteban Felipe; Terrados, Julio; Vanegas Peralta, Pablo Fernando
Urban energy models assume that energy is imported from outside the urban area. Forecast increases in urban population and energy use intensity will increase energy requirements. One alternative is to integrate sources of renewable energy within cities boundaries. To do so, differences in urban form, resources availability, energy requirements, condition of buildings, infrastructure, and population and building density make city-specific analysis necessary. This study identifies 14 factors that urban planners should consider to make the most appropriate technology choices for a given city. Through consultation with 78 experts, the presence of renewable energy sources was selected as the most important factor, followed by economic conditions in the city. The least important factors were environmental consequences of global warming, eutrophication and acidification
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.
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 .
Allocating reforestation areas for sediment flow minimization: an integer programming formulation and a heuristic solution method
(2012) Vanegas Peralta, Pablo Fernando
Policy and decision makers dealing with environmental conservation and land use planning often require identifying potential sites for contributing to minimize sediment flow reaching riverbeds. This is the case of reforestation initiatives, which can have sediment flow minimization among their objectives. This paper proposes an Integer Programming (IP) formulation and a Heuristic solution method for selecting a predefined number of locations to be reforested in order to minimize sediment load at a given outlet in a watershed. Although the core structure of both methods can be applied for different sorts of flow, the formulations are targeted to minimization of sediment delivery. The proposed approaches make use of a Single Flow Direction (SFD) raster map covering the watershed in order to construct a tree structure so that the outlet cell corresponds to the root node in the tree. The results obtained with both approaches are in agreement with expert assessments of erosion levels, slopes and distances to the riverbeds, which in turn allows concluding that this approach is suitable for minimizing sediment flow. Since the results obtained with the IP formulation are the same as the ones obtained with the Heuristic approach, an optimality proof is included in the present work. Taking into consideration that the heuristic requires much less computation time, this solution method is more suitable to be applied in large sized problems.