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

The problem of counting independent sets of a graph G is not only mathematically relevant and interesting, but also has many applications in physics, mathematics, and theoretical computer science. In this paper, a novel method for counting independent sets on grid-like structures is presented. It starts by explaining the recurrences used by the method to count independent sets on basic topologies of graphs. The method is extended to process grid-like structures of quadratic faces. The proposal has a lower time complexity than the required on the leading and current method based on the transfer matrix for counting independent sets on grids.

      

Lopez-Gatell, who has managed the public policy to control the SARS-CoV-2 virus, has on several occasions made forecasts on the dynamics of infections and deaths; but if such series are non-stationary, this implies a very serious error. In our opinion, many of these series have a non-stationary data generating process and, therefore, forecasts cannot be made. To determine this, we will use various econometric techniques such as unit root tests and, in addition, we will see if the series responds to a regime shift process. As results we have that the series of weekly contagions by COVID-19 in 8 entities of the country, only one of them is stationary, in addition, when analyzing the trajectory of the contagions through Markov chains to determine the performance of these states to control the contagions, we found that one of them had a very bad performance, 5 with bad performance and 1 with good performance.

The tourist cities apply technologies to strengthen and facilitate the communication of the tourists with the sporting, cultural, scientific and other aspects of a city. Smart tourism is the innovation and the adoption of information and communication technologies in tourism. The Smart white cane gives smart tourism to Blind people. The smart white cane is a white cane for blind people supplemented with Electronic Travel Aids, Electronic Orientation Aids, and Position Locator Devices. This paper proposes a smart white cane for visually impaired people for hearing recreation in tourist environments (smart tourist white cane or Smart White Cane for Smart Tourism).

The Air quality measurement is reported as micrograms per cubic meter or parts per million. In this article, we proposed a survey of the complexity on Fuzzy Logic for air quality. The traditional air quality assessment is estimated using air quality indices as mean values of selected air pollutants, where the ambient environment has given limits without considering specific local conditions and synergic relations between air pollutants and other meteorological factors. Different models analyze the structure of data to find the characteristics of air quality similarities and to interpret the classification results by means of fuzzy logic.

This research aims to show the results of applying optimization in the distribution network of high consumption products, using metaheuristics for the design of distribution routes, applying genetic algorithms, performing the simulation in the HeuristicLab software. Achieving the optimization of the distribution processes of high consumption products which has grown in recent years to the increase of the population and the increase of the vehicular congestion, in the big cities, hindering the achievement of common objectives between the different actors in Urban Distribution of Merchandise (DUM). The research was quantitative cross-sectional non-experimental, because the situations and subjects of study, could not be manipulated by the researcher, the information was provided by the company, which, for reasons of confidentiality, will not be named.

The purpose of this document is to provide an overview of trends in the Fintech sector that will allow organizations in the industry to consider possible futures in order to outline strategies for growth and permanence in the market; knowledge of the possible future generates a competitive advantage within organizations. To identify the trends, we performed a documentary research using Artificial Intelligence/Natural Language Processing to detect patterns of Political, Economic, Social, Technological and Legal elements, resulting in the following trends: "Fintech as a driver of development", "Digital Economy" and "Latent Risks and Challenges of the Environment".

The objective of the research is to categorize the demand for digital skills in the online digital job market in Mexico in the period December 2019-February 2020.  For the development of the study, three digital job platforms Workana, Freelance and Freelancer Writing Jobs were considered. The study was developed considering the vacant projects published on gig platforms on a daily basis that allowed identifying the skills demanded, through content analysis. This allowed quantifying the participation of digital skills and grouping them according to their characteristics based on the literature review. The findings of the research for the gig job market mediated by platforms in Mexico, were the following, Workana is the leading platform with the highest demand for digital skills, Graphic Design was the digital skill with the highest frequency in demand, finally; the category of specialized digital skills represented the greatest opportunity for freelance and temporary employment.

The urbanization that most of the municipalities in the State of Guanajuato are undergoing has made it imperative to generate strategies that allow an adequate administration and management of the drinking water service [1]. In this research, the water marginalization index for the State of Guanajuato is constructed using data from the 1990, 2000, 2010 and 2020 Population and Housing Censuses, which allowed for an analysis of the evolution of the effects of the policies adopted by the authorities to meet this challenge. The results indicate a favorable evolution of supply, however, the increase in the percentage rate of the use of rivers or community wells as a source of water supply is noteworthy, going from 6.99 to 31.21 percent from 2010 to 2020, this result indicates an increasing overexploitation of the aquifers, which will cause complications in the future supply of water.

The objective of this research work is to analyze the unavailability of the population of the State of Hidalgo for access to information technologies through the generation of the index of material unavailability of ICT, which allowed the classification of the municipalities in five dimensions analyzed statistically and using georeferencing techniques. The variables selected for this purpose were Internet connectivity, use of fixed telephone, mobile telephone, and computer. The information used was taken from the 2020 Population and Housing Census, as it was the only source of information that met the required Municipal coverage.  Among the most significant findings, we found a clear tendency to use cell phones for connectivity instead of using the Internet on computer equipment; however, this brings with it the difficulty for efficient use in activities such as school homework.