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Jalpa de Méndez, Mexico

Ramirez-Ortegon M.A.,UJAT | Ramirez-Ortegon M.A.,TU Braunschweig | Ramirez-Ramirez L.L.,Autonomus Institute of Technology of Mexico | Margner V.,TU Braunschweig | And 4 more authors.
Pattern Recognition | Year: 2014

In this paper, we will present a mathematical analysis of the transition proportion for the normal threshold (NorT) based on the transition method. The transition proportion is a parameter of NorT which plays an important role in the theoretical development of NorT. We will study the mathematical forms of the quadratic equation from which NorT is computed. Through this analysis, we will describe how the transition proportion affects NorT. Then, we will prove that NorT is robust to inaccurate estimations of the transition proportion. Furthermore, our analysis extends to thresholding methods that rely on Bayes rule, and it also gives the mathematical bases for potential applications of the transition proportion as a feature to estimate stroke width and detect regions of interest. In the majority of our experiments, we used a database composed of small images that were extracted from DIBCO 2009 and H-DIBCO 2010 benchmarks. However, we also report evaluations using the original (H-)DIBCO's benchmarks. © 2014 Elsevier Ltd. Source

Ramirez-Ortegon M.A.,UJAT | Ramirez-Ramirez L.L.,Autonomus Institute of Technology of Mexico | Messaoud I.B.,National Engineering School of Tunis | Margner V.,TU Braunschweig | And 2 more authors.
International Journal on Document Analysis and Recognition | Year: 2014

In this article, our goal is to describe mathematically and experimentally the gray-intensity distributions of the fore- and background of handwritten historical documents. We propose a local pixel model to explain the observed asymmetrical gray-intensity histograms of the fore- and background. Our pixel model states that, locally, the gray-intensity histogram is the mixture of gray-intensity distributions of three pixel classes. Following our model, we empirically describe the smoothness of the background for different types of images. We show that our model has potential application in binarization. Assuming that the parameters of the gray-intensity distributions are correctly estimated, we show that thresholding methods based on mixtures of lognormal distributions outperform thresholding methods based on mixtures of normal distributions. Our model is supported with experimental tests that are conducted with extracted images from DIBCO 2009 and H-DIBCO 2010 benchmarks. We also report results for all four DIBCO benchmarks. © 2013 Springer-Verlag Berlin Heidelberg. Source

Ble-Castillo J.L.,Juarez Autonomous University of Tabasco | Aparicio-Trapala M.A.,UJAT | Juarez-Rojop I.E.,Juarez Autonomous University of Tabasco | Torres-Lopez J.E.,Juarez Autonomous University of Tabasco | And 4 more authors.
International Journal of Environmental Research and Public Health | Year: 2012

The macronutrient component of diets is critical for metabolic control and insulin action. The aim of this study was to compare the effects of high fat diets (HFDs) vs. high carbohydrate diets (HCDs) on metabolic control and insulin resistance in Wistar rats. Thirty animals divided into five groups (n = 6) were fed: (1) Control diet (CD); (2) Highsaturated fat diet (HSFD); (3) High-unsaturated fat diet (HUFD); (4) High-digestible starch diet, (HDSD); and (5) High-resistant starch diet (HRSD) during eight weeks. HFDs and HCDs reduced weight gain in comparison with CD, however no statistical significance was reached. Calorie intake was similar in both HFDs and CD, but rats receiving HCDs showed higher calorie consumption than other groups, (p < 0.01). HRSD showed the lowest levelsof serum and hepatic lipids. The HUFD induced the lowest fasting glycemia levels and HOMA-IR values. The HDSD group exhibited the highest insulin resistance and hepaticcholesterol content. In conclusion, HUFD exhibited the most beneficial effects on glycemic control meanwhile HRSD induced the highest reduction on lipid content and did not modify insulin sensitivity. In both groups, HFDs and HCDs, the diet constituents were more important factors than caloric intake for metabolic disturbance and insulin resistance. © 2012 by the authors; licensee MDPI, Basel, Switzerland. Source

Yasui G.S.,Hokkaido University | Yasui G.S.,University of Sao Paulo | Fujimoto T.,Hokkaido University | Arias-Rodriguez L.,UJAT | And 2 more authors.
Aquaculture | Year: 2012

The solutions commonly used to dilute or cryopreserve sperm are commonly composed of salts, buffers and cryoprotectants, which may affect gametes and subsequent fertilization success. Here, we have evaluated the effects of several cryoprotectants (methanol; MeOH, dimethyl sulfoxide; DMSO and dimethyl acetamide; DMA at concentrations of 0.25, 0.5 and 1%) and different ions (potassium, calcium and magnesium at concentrations of 1.25, 2.5, 5.0 and 10. mM) as sperm diluents upon sperm motility and fertilization success in the loach Misgurnus anguillicaudatus sperm. Our results demonstrated that DMSO (at 1%) decreased sperm motility while calcium and magnesium ions (from 2.5. mM) induced sperm aggregation and reduced sperm motility. Reduced fertilization rates were observed with potassium (from 1.25. mM), calcium (at 10. mM), magnesium (at 10. mM), DMA (at 1%), and DMSO (at 1%). We conclude that specific ions and cryoprotectants, and their relative concentrations caused effect upon loach gametes. These data are important to consider for the preparation of sperm diluents and activating solutions in order to manage gamete quality for artificial propagation. © 2012 Elsevier B.V.. Source

Ble-Castillo J.L.,Juarez Autonomous University of Tabasco | Aparicio-Trapala M.A.,UJAT | Francisco-Luria M.U.,Instituto Mexicano del Seguro Social IMSS | Cordova-Uscanga R.,Instituto Mexicano del Seguro Social IMSS | And 3 more authors.
International Journal of Environmental Research and Public Health | Year: 2010

Few fiber supplements have been studied for physiological effectiveness. The effects of native banana starch (NBS) and soy milk (control) on body weight and insulin sensitivity in obese type 2 diabetics were compared using a blind within-subject crossover design. Subjects undertook two phases of 4-week supplementation either with NBS or soy milk. Patients on NBS lost more body weight than when they were on control treatment. Plasma insulin and HOMA-I were reduced after NBS consumption, compared with baseline levels, but not significantly when compared to the control treatment. Results support the use of NBS as part of dietary fiber supplementation. © 2010 by the authors. Source

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