6 results on '"Chávez-García, Carlos A."'
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2. Encriptación de imágenes DICOM en HDFS para Big Data
- Author
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Chávez García, Carlos Alberto, Silva Armijos, Leonardo Alfonso, and Ramírez Montalvan, Washington Arsenio
- Subjects
CRIPTOGRAFÍA ,SISTEMAS ,DATOS ,CLAVES ,INGENIERÍA DE SISTEMAS ,INFORMÁTICA - Abstract
En la actualidad Big Data ha adquirido un papel importante en el campo médico, debido a su análisis de datos y bajo costo de adquisición, permitiendo almacenar grandes cantidades de datos generados por pacientes. Los estudios biomédicos DICOM demandan una gran capacidad de análisis, ya que las imágenes médicas son de alta resolución y se encuentran en formato digital. El presente proyecto tiene la finalidad de proteger las imágenes almacenada en los estudios biomédicos DICOM a través del uso de un algoritmo de cifrado simétrico, debido a que las imágenes de los pacientes son de carácter personal, por lo cual se debe garantizar la integridad y confidencialidad de las mismas, para el desarrollo del proyecto se llevó acabo tres fases. La primera fase llamada Hadoop se configura e implementa un entorno completamente distribuido para el procesamiento de estudios médicos DICOM con encriptación; en la segunda fase llamada Kerberos se proporciona seguridad en los servicios de red y en la tercera fase llamada Repositorio DICOM se envía los estudios médicos DICOM de manera automática al entorno Hadoop para su respectivo procesamiento. Las pruebas fueron realizadas con diferentes tipos de estudios biomédicos DICOM, como son tomografías computarizadas, mamografías, resonancias magnéticas, y ultrasonidos donde se refleja el rendimiento del prototipo al almacenar y cifrar la información del paciente. Nowadays, Big Data acquired an important role in the medical field, due to her data analysis and low acquisition cost, allowing to store large quantities of data generated by patients. Biomedical studies DICOM demand a great capacity of analysis, since the medical images are high resolution and they are in digital format. The present project has the finality of protect the images stored in the biomedical studies DICOM across use of a symmetric encryption algorithm, due to a that the images of patient are of personal character, whereby the integrity and confidentiality must be guaranteed of them, for the development of project took place three phases. In the first phase called Hadoop, a completely distributed environment is configured and implemented for the processing of DICOM medical studies with encryption; in the second phase called Kerberos provides security in the network services and in the third phase called the DICOM Repository, the DICOM medical studies are sent automatically to the Hadoop environment for their respective processing. The tests were performed with different types of DICOM biomedical studies, such as tomography, mammography, magnetic resonance, and ultrasound where the performance of the prototype is reflected when storing and encrypting patient information.
- Published
- 2019
3. Modelo de requerimiento hídrico en un distrito de riego en México: incorporando escenarios de cambio climático
- Author
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Ruiz-Del-Angel, Edgar Omar, primary, Vargas Castilleja, Rocío Del Carmen, additional, Rolón Aguilar, Julio Cesar, additional, and Chávez García, Carlos Alberto, additional
- Published
- 2019
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4. Análisis del requerimiento hídrico en un distrito de riego de Tamaulipas, México.
- Author
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Ruíz-del Ángel, Edgar Omar, del Carmen Vargas-Castilleja, Rocío, César Rolón-Aguilar, Julio, Alberto Chávez-García, Carlos, and Pichardo-Ramírez, Roberto
- Subjects
WATER supply ,IRRIGATION water ,WATER efficiency ,AGRICULTURAL development ,IRRIGATION farming ,CLIMATE change - Abstract
Copyright of Ingeniería Agrícola is the property of Instituto de Investigaciones de Ingenieria Agricola and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
5. OPTIMIZACIÓN DEL RIEGO POR SURCOS MEDIANTE UNA FÓRMULA ANALÍTICA Y SU IMPACTO EN LA REDUCCIÓN DEL AGUA APLICADA.
- Author
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Chávez-García, Carlos A. and Fuentes-Ruiz, Carlos
- Abstract
The gravity irrigation method is the most frequently used in the 85 Irrigation Districts in Mexico. One of the main problems is the considerable loss caused by the incorrect design of the irrigation longitude or the irrigation flow rate, from the selection of the inappropriate irrigation flow. The objective of this study was to demonstrate that from the evaluation of an irrigation test, the optimal flow rate can be calculated for each furrow during irrigation from data obtained from the plot and the net irrigation depth to be applied. The hypothesis was that with this flow rate, the gross historical water depth applied in the plots evaluated could be decreased. In this study, 197 irrigation tests were evaluated and designed, in eight textures, in Irrigation District 085, La Begoña, Guanajuato, Mexico. In each irrigation test, the following variables were measured in the plots: slope, furrow width, entry flow rate, initial moisture contents, and for saturation and apparent density. With an optimization algorithm, the parameters of the Green and Ampt (Ks y hf ) infiltration equation were calculated from the advancement, storage and recession phases of each test. For the simulation process of the superficial flow, the kinematic wave model was used and the optimal flow rate was calculated with an analytical formula, which was validated with the complete Saint-Venant and Richards model. With the application of the optimal flow rate of calculated irrigation, the irrigation depths decreased in average 19.63 cm, and in some cases, an in water depth of up to 124.68 cm ceased to be applied. The irrigation times decreased in average 11.76 h ha-1 per irrigation event and, in addition, the average savings was 2000 m3 ha-1 per irrigation event, which increased the average efficiency from 53 to 85 %. [ABSTRACT FROM AUTHOR]
- Published
- 2018
6. Políticas sociales en la región andina: el caso de Colobia (2000-2007)
- Author
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Ahumada-Beltrán, Consuelo, Cancino-Cadena, Arturo, and Chávez-García, Carlos
- Subjects
políticas públicas ,gasto militar ,Plan Colombia ,fiscal adjustment ,military expenditure ,Colombia ,Ajuste fiscal ,Public policies - Abstract
El estudio y evaluación de las políticas sociales adoptadas en Colombia en el período 2000-2007 parte de dos consideraciones centrales: 1) Aunque las consecuencias sociales de las reformas neoliberales, que se sintieron en toda la región andina hacia finales de la década anterior, presentan sus particularidades en el caso de Colombia, los rasgos centrales de la crisis social son similares en todos estos países. 2) La historia reciente de Colombia está signada por la persistencia y agudización del conflicto armado. Adicionalmente, el país se convirtió en el eje de la estrategia antinarcóticos y de la lucha contra el terrorismo en la región andina. Tanto esta situación como las políticas internacionales y regionales que se ponen en práctica para hacerle frente, afectan de manera notoria las condiciones sociales y las políticas públicas. A partir de las consideraciones anteriores se desarrollará el presente análisis, que consta de cuatro partes. En la primera se analiza la situación social del país durante el presente siglo. En la segunda se examinan dos políticas que inciden notoriamente en lo social: el ajuste fiscal y el gasto militar. La tercera parte se dedica al análisis del programa Acción Social y en la cuarta se examinan las estrategias sociales derivadas del Plan Colombia. The study and assessment of the social policies adopted in Colombia during the period 2000- 2007 must stem from two main considerations: 1) Although the social consequences of neoliberal reforms -suffered by the Andean Region at the end of the past decade- present its particularities in the Colombian case, the main traits of the social crisis are similar in all the Andean countries. 2) The recent history of Colombia has been signed by the persistence and aggravation of the armed conflict. In addition, the country became the center of the counternarcotics strategy and of the struggle against terrorism in the Andean Region. This situation and the international and regional policies implemented to confront it, have significantly affected social conditions and public policies in the country. Taking into account such considerations, this paper is broken up into four parts. The first is an assessment of the social situation of the country during the present century. The second is devoted to the analysis of two key policies with strong impact on social issues: the fiscal adjustment policy and the military expenditure. In the third part, the analysis of the program of Acción Social is undertaken and in the fourth the social strategies derived from Plan Colombia are examined.
- Published
- 2008
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