Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The investigation determined the location to build a graphite commercial warehouse (GCW), derived from the fact that the only place of production of the input is the state of Sonora, the above complicates satisfying the internal and external market of consumers due to the times and the distances. The methodology applied to determine the location for the construction of the warehouse was by means of a macro and micro analysis of location, both contemplate the diagnosis of variables through the methods of critical factors and center of gravity. The results allowed obtaining the order of alternatives for the GCW are Querétaro, followed by San Luis Potosí, Guanajuato, Tamaulipas, Aguascalientes, and Durango. The conclusion is that the GCW must be built in the location of georeferenced coordinates (20 ° 49´40.32 "N, 100 ° 18´32.38" W) or its equivalent (20.827, -100.308), specifically in the municipality of Marquez for have optimal communication channels and be a strategic point for the distribution of the product.

This paper presents a novel hybrid approach for studying electric power systems as a combination of the electrical power generation process and the actual state of the transmission lines. The approach is composed of a discrete-event simulation model and a mathematical programming model. The simulation model is designed as a routing problem defined over a set of transmission lines considered (individually) as active, inactive, under maintenance, and outage. On the other hand, the mixed-integer lineal programming model determines the best way to generate and transmit power flows (considering, simultaneously, all possible solutions). This type of model allows solving the economic dispatch problem in lower computational times. It also ensures reaching the global optimum. When adding the discrete-event simulation model for studying the state of transmission lines, the final hybrid approach allows obtaining feasible solutions when the system parameters change. Here, both models (i.e., simulation and optimization models) are combined to improve the capabilities of the model structure to represent real-life scenarios. Our proposal is used to analyze a case study composed of an electric system with six buses, eleven lines, and three generators.

The presented paper is relevant, as it presents the results of fatigue tests of titanium alloy. The purpose of the article is to describe the use of the hypothesis of linear damage summation when processing the results of fatigue tests. In the study, the authors used empirical methods such as indirect observation of the object under study, description, and measurement of technical influences exerted on it by an artificial means. The linear regression analysis to establish the relationship between stress and durability was also used. The endurance limit of the titanium alloy was determined, which lies in the range from 460 to 480 MPa with the number of cycles from 105 to 108. It was concluded that the use of the linear damage summation hypothesis in processing the results of fatigue tests entails a satisfactory practical accuracy of the calculation of endurance limit

In this work we present a microwave intracavity sensor for the characterization of aqueous solutions of nano-liter sessile droplets, deposited on the microstrip line electrode. The sensor operates at  frequency and is based on tunable magnonic delay line oscillator. The samples were characterized by using their evaporation dynamics, by measuring their dielectric constants. The experiments have shown that the sensor is capable of detecting the salinity (S) of water with the required precision and resolution. The advantage of the sensor is the possibility of measuring the parameters such as S, Total Dissolved and Total Suspended Solids, simultaneously.

Wireless-based networks encompass assisted human life in distinct domains like Agriculture, health, infrastructure, climate, transportation and defense. In particular, the wireless sensor networks have been addressed in this article. Though it has many advancements, providing secure data transmission needs a major focus on these platforms. The disruptions or interference is one of the vulnerable security problems in Wireless Sensor Networks. Inside the network, an intruder can encroach and interrupt the whole transmission process. The involvement of an intruder in the device must be remembered in the network. WSN encompasses a wide geographical region and focus on rectification of issues in protocols for routing, interoperability, connectivity, and defense plays a major role. Hence, this article addresses about routing protocols of WSN, applications, recent network security issues and their variants of defense mechanisms. The conclusion depicts the classification of network security issues, requirements, and descriptive defense mechanisms for secure data transmission.

With the rise of the Internet, we now have a lot of information at our disposal. We 're swamped from many sources — news, social media, to name a few, office emails. This paper addresses the problem of reading through such extensive information by summarizing it using text summarizer based on Abstractive Summarization using deep learning models, i.e. using bidirectional Long Short-Term Memory (LSTM) networks and Pointer Generator mode. The LSTM model (which is a modification of the Recurrent Neural Network) is trained and tested on the Amazon Fine Food Review dataset using the Bahadau Attention Model Decoder with the use of Conceptnet Numberbatch embeddings that are very similar and better to GloVe. Pointer Generator mode is trained and tested by the CNN / Daily Mail dataset and the model uses both Decoder and Attention inputs. But due 2 major problems in LSTM model like the inability of the network to copy facts and repetition of words the second method is, i.e., Pointer Generator mode is used. This paper in turn aims to provide an analysis on both the models to provide a better understanding of the working of the models to enable to create a strong text summarizer. The main purpose is to provide reliable summaries of datasets or uploaded files, depending on the choice of the user. Unnecessary sentences will be rejected in order to obtain the most important sentences.

Two multi-criteria decision making approaches were implemented in this paper for selecting a U.S. university considering the industrial engineering doctorate degree as a case study. The Preference Selection Index (PSI) and the Analytical Hierarchy Process (AHP) were these approaches. A total of 37 universities and 20 attributes were considered. The attributes were related to the university reputation, location, financial, and ease of admission. In this paper, the PSI model was initially constructed and its results were adopted in the AHP model. Data of this paper were obtained from the US News and World Report, Times Higher Education (THE) and other well-known organizations. Results proved that the PSI approach could be used in decisions with large number of alternatives and attributes, and the PSI model was able in making the AHP model requirements easier, by reducing the criteria and alternatives. In both the PSI and the AHP models, the university reputation had the highest preferences of students, followed by the ease of admission, financial and then location. Sensitivity analyses for the PSI and AHP models were performed to evaluate the accuracy of the results. Results of this study could be applied in other students’ disciplines for finding a suitable university.

The plane has become a convenient method of transportation. The main idea of aviation in the 21st century is the safety of passengers and crew. But the human is always inclined towards comfort. The structural and parametric analysis of the long-haul aircraft development made it possible to form the concept of the fuselage layout with capsule accommodation of passengers. The proposed variant of the capsule accommodation, designed for the Boeing 777-200LR, can be installed in other passenger airliners with a ceiling height of at least 2.1 m. Analysis of alternative options for the layout of the passenger compartment allows us to state: with a flight range of more than 8 hours, the flight is comfortable only in business or first classes; the proposed two-story capsule placement allows to provide the layout with first-class seats in a given cabin.

El estado nutricio de menores de 5 años puede deteriorarse por prácticas inadecuadas de alimentación. Para evaluar el efecto en los conocimientos y prácticas de alimentación infantil de madres, y en el estado nutricio de niños, se realizó una intervención educativa participativa. Se incluyeron 21 madres-hijos que asistieron a consulta al Hospital General de la Secretaría de Salud de la ciudad de Tlaxcala, México; cuando los niños eran diagnosticados con desnutrición (puntaje z de peso/edad <-1), se solicitó a las madres que participaran en un taller semanal, por 8 semanas. Los talleres se basaron en demostraciones para preparar, combinar y variar alimentos en forma adecuada para la edad de los niños. Los conocimientos de las madres se evaluaron mediante cuestionario aplicado antes y después de los 8 talleres. Las prácticas de alimentación infantil se evaluaron a través de observación directa al inicio y a los 4 meses del estudio. El estado nutricio de los niños se evaluó al inicio y a los 5 meses del estudio, y se comparó con los datos antropométricos de niños atendidos en el mismo hospital 5 meses antes del inicio del estudio (control histórico), con características similares al grupo intervenido. Preintervención, 38.1% de las madres tenía conocimientos aceptables sobre la alimentación de sus niños, y 57.1% mostraba prácticas aceptables de alimentación infantil. Estos porcentajes se elevaron postintervención a 71.4% (p<0.05) y 85.7% (p<0.05), respectivamente. En la medición basal, 5.6% de los niños presentaba desnutrición leve, 83.3% moderada y 11.1% grave. Cinco meses después, el 66.6% había mejorado significativamente (p<0.05) en comparación con el grupo control histórico. Se concluye que, el estudio mejoró los conocimientos y prácticas de alimentación infantil, influyendo en la mejoría del estado nutricio de los niños.

El presente trabajo esta orientado al recorrido histórico del constitucionalismo mexicano, siendo el punto de partida la Constitución de Apatzingan de 1814, pero que se centra en la Constitución de 1917, mostrando algunas reformas constitucionales de gran relevancia como la del 31 de didiembre de 1994, la del 18 de junio del 2008 y del 10 de junio de 2011 que tuvieron un impacto en el sistema juridico nacional, la primera fortaleciendo al Poder Judicial de la federación y las últimas pasando del constitucionalismo al convenconalismo y humanismo. Es así que en esa ruta del tiempo la Constitución ha evolucionado bajo su esencia democrática, pero de control, determinando obligaciones de protección de los derechos humanos como medio de control al poder público, la investigación tiene un enfoque metodologico cualitativo documental, a través de los métodos, deductivo, inductivo, histórico, de analisis,demostrativos entre otros bajo técnicas de observación y exporación.   AbstractThe present work is oriented to the historical journey of Mexican constitutionalism, being the starting point the Constitution of Apatzingan of 1814, but which focuses on the Constitution of 1917, showing some constitutional reforms of great relevance such as that of December 31, 1994, the one of June 18, 2008 and June 10, 2011 that had an impact on the national legal system, the first strengthening the Judiciary of the federation and the last passing from constitutionalism to conventionalism and humanism. It is thus that in this route of time the Constitution has evolved under its democratic essence, but of control, determining obligations of protection of human rights as a means of control to the public power, the investigation has a documentary qualitative methodological approach, through the methods, deductive, inductive, historical, analytical, demonstrative among others under observation and exporation techniques.