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Ciudad Juárez, Mexico

Gordillo N.,University of Ciudad Juarez | Montseny E.,University of Barcelona | Sobrevilla P.,University of Barcelona
Magnetic Resonance Imaging | Year: 2013

Brain tumor segmentation consists of separating the different tumor tissues (solid or active tumor, edema, and necrosis) from normal brain tissues: gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF). In brain tumor studies, the existence of abnormal tissues may be easily detectable most of the time. However, accurate and reproducible segmentation and characterization of abnormalities are not straightforward. In the past, many researchers in the field of medical imaging and soft computing have made significant survey in the field of brain tumor segmentation. Both semiautomatic and fully automatic methods have been proposed. Clinical acceptance of segmentation techniques has depended on the simplicity of the segmentation, and the degree of user supervision. Interactive or semiautomatic methods are likely to remain dominant in practice for some time, especially in these applications where erroneous interpretations are unacceptable. This article presents an overview of the most relevant brain tumor segmentation methods, conducted after the acquisition of the image. Given the advantages of magnetic resonance imaging over other diagnostic imaging, this survey is focused on MRI brain tumor segmentation. Semiautomatic and fully automatic techniques are emphasized. © 2013 Elsevier Inc. Source

Gonzalez J.C.C.,National Autonomous University of Mexico | Cepeda L.A.G.,National Autonomous University of Mexico | Yanez S.A.B.,National Autonomous University of Mexico | Cornejo A.D.,University of Ciudad Juarez | And 2 more authors.
Indian Journal of Pathology and Microbiology | Year: 2016

Background: The use of p16 and p53 as biomarkers of malignant transformation of oral epithelial dysplasia (OED) and biological behavior of oral squamous cell carcinoma (OSCC) is controversial. Aim: To determine the immunoexpression of p16 and p53 in OED and OSCC and to establish their possible relation to histopathological grading of OED/OSCC. Materials and Methods: Ninety-six OEDs (40 mild, 36 moderate, and 20 severe dysplasia); and 112 OSCCs (64 well-differentiated, 38 moderately differentiated, and 10 poorly differentiated) coming from archives of four centers of oral pathology were included. Histological slides from all cases were processed with immunohistochemical technique using anti-p53 and anti-p16 antibodies. The intensity of the immunoreactivity were classified using the ImageLab®MCM systemas follows: <60 mild, >60-<90 moderate, and >90 strong. Forstatistical purposesa χ2 test (P < 0.05) was performed. Results: Severe dysplasia show highest relative frequency of p16-positive (35.5%), whereas p53 is associated with mild dysplasia (P = 0.04). Moderately differentiated OSCC had larger relative frequency of p16-positive and p53-positive cases (47.3% both circumstances) (P > 0.05). Statistical association of p16-positive and p53-positive cells to basal stratum of OED (P = 0.0008; P = 0.0000, respectively) and p16-positive cells and p53-positive cells to perivascular zone of OSCC (P = 0.001; P = 0.0000, respectively) was found. Conclusions: p16 and p53 could be not specific enough to identify patients suffering OED with high risk to malignancy; however, the evaluation of the presence of p16 and p53 in the tumoral invasive front of OSCC could contribute to establish the tumor progression. © 2016 Indian Journal of Pathology and Microbiology | Published by Wolters Kluwer - Medknow. Source

Davila-Saldivar C.,University of Guadalajara | Medina-Vazquez A.S.,University of Guadalajara | Jimenez-Perez A.,University of Ciudad Juarez | Gurrola-Navarro M.A.,University of Guadalajara
2014 11th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2014 | Year: 2014

The extraction of the floating gate voltage on the Multiple-Input Floating-Gate Transistor is discussed in order to understand their behavior in a better way. The lack of linearity at very low voltage is discussed. The presence of a residual charge on the floating gate is experimentally shown despite the use of metal contact to discharge it. This analysis is useful to enhance the mathematical model and consequently to have better results in the simulation process especially when this device is used as an entirely analog processing element. Methods to extract and plot the floating gate voltage are addressed. A comparison between analytical and experimental results is shown. © 2014 IEEE. Source

Herrera L.C.,University of Ciudad Juarez | Gomez-Azpeitia G.,University of Colima | Ruiz P.,University of Chiapas | Gomez A.,University of Colima
PLEA 2011 - Architecture and Sustainable Development, Conference Proceedings of the 27th International Conference on Passive and Low Energy Architecture | Year: 2011

This paper presents the results of a field study on thermal comfort of inhabitants of low cost dwellings in two cities of the northern arid region of Mexico: Chihuahua (lat: 28N, long: 106W) and Ciudad Juarez (lat: 31N, long: 106W). The field study was conducted upon the adaptive approach of thermal comfort, and according the ISO 10551 requirements. The survey was applied to 531 inhabitants of dwellings built by the Chihuahua State Housing Institute, during two periods in 2010: cold season (February) and hot season (July). Given that the climate of the region has features of "asymmetric" climates, so called by Nicol (1993), the data obtained in the field study was analyzed by the Averages for Thermal Sensation Intervals Method (ATSI) (Gomez-Azpeitia et alt, 2009). The research has as objectives to carry out an assessment of this kind of housings offered by the local government and to propose recommendations for the design of new dwellings. Source

Saenz D.C.,University of Ciudad Juarez | Castillo N.G.,University of Ciudad Juarez | Romeva C.R.,Center for Industrial Equipment Design
Expert Systems with Applications | Year: 2015

This work presents a methodology for the selection and comparison of non-traditional sheet metal cutting processes as a new structure of selection by means of an expert system. The model is generated from a knowledge base acquired from diverse experts, and the use of fuzzy logic techniques. With a simple input of the parameters of a piece, the system offers the most appropriate cutting options (based on the requirements of the piece) allowing a non-expert user selecting the most appropriate process with emphasis on a predefined priority: finish, cost or time. The selection process consists of four base algorithms that measure the attributes of each process as a dependent indicator of the other processes, that is, a pre-selection that considers (1) the process capability to cut a material-thickness relation, (2) the speed that can be achieved with this relation, (3) the inherent complexity of the piece to be cut, and (4) the process tolerance. Results of experiments under three different approaches prove that the expert system here presented accurately prioritizes the most convenient cutting processes. © 2015 Elsevier Ltd. All rights reserved. Source

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