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

The focus of the study is the investigation of terminological foundations and the development of practical recommendations for assessing the effectiveness of hydrocarbon inflow stimulation at the final stage of field development. The authors refer to scientific works on the issues of company performance. The paper provides substantiation and improvement of methodological grounds with respect to assessing the effectiveness of gas inflow stimulation works. A classification and analysis of prominent Russian and foreign methods are provided and their issues are identified. As a result, the work refines the methodology for assessing the effectiveness of work at the drilling enterprise. The authors' comprehensive approach to assessing the effectiveness of inflow stimulation works, which allows for obtaining interrelated performance assessments, is proposed.

Supercritical fluid extraction is a rapid, selective, and environmentally friendly method of particular interest in the extraction of essential oils from plants and herbs. Curcuma zedoaria is a member of the Zingiberaceae family widely cultivated in India, China, and Southeast Asia, including Vietnam. This study examined the chemical composition and antimicrobial activity of essential oils from the leaves and rhizomes of C. zedoaria from Vietnam obtained via supercritical fluid extraction. The main compounds of leaf essential oil were iso-borneol (31.2%), β-elemene (14.7%), β-caryophyllene (11.4%), 1,8-cineole (9.7%), and caryophyllene oxide (5.9%). In rhizome essential oil, 1,8-cineole (41.7%), β-elemene (13.6%), curzerenone (12.3%), camphor (10.2%), and germacrene B (5.2%) comprised the main compounds. The essential oils from C. zedoaria leaves and rhizomes displayed antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, and Candida albicans, with minimum inhibitory concentration values ranging from 100–400 µg/mL. Thus, our results support the need for further investigation of C. zedoaria essential oils as a potential source of antimicrobial agents.

The aim of the research is to forecast the suitable suppliers for construction project using machine learning techniques. Firstly the librarian studies were conducted and research gap is extracted. Then innovation was determined. Based on the innovation a model for suitable supplier forecasting for construction project using machine learning techniques were provided. The model includes 12 entry variables and 1 output variable that include supplier performance. The model using 2 algorithm of artificial neuron network and support vector machine were conducted and the most influencing factors were determined using decision tree algorithm. The general comparison between artificial neuron network and support vector machine indicate the better performance of artificial neuron network based on decision tree. Based on decision tree results we can say that the supplier company income is considered as most important variable. The order change cost variable play the separator role in lower level. The life variables of companied and guarantees after company income and change cost of order play the main role.

The development and implementation of the latest technologies allow achieving competitive advantages in the global market and open up a wide range of prospects in various fields of activity. High risks and significant initial investments have predetermined the need to develop the most accurate methods for assessing the effectiveness of innovations. Traditional methods of investment assessment allow analyzing the economic component of these projects but do not consider specific risks that have a predominant impact on the successful result of financing. The study shows the need for an individual approach to assessing the effectiveness of each innovative project implementation, which should take into account its social significance in conjunction with maximizing economic benefits. Calculations that allow obtaining a single criterion for choosing the most optimal variant of the project implementation are presented. Recommendations on the organization of effective deployment of the 5G network in the Russian Federation are given in the study's conclusion.

Wireless sensor networks (WSN) and radio frequency identification (RFID) are base technologies employed in decentralised dynamic environments. In the hybrid network formed by integrating RFID and WSN, RFID data can be used applying WSN protocols for multi-hop communications. However, RFID data contain excessive duplication, which increases time delay and energy consumption, resulting in wastage of different resources. There exist four popular RFID–WSN integration architectures: hierarchical RFID-sensor topology, network RFID-sensor topology, reader-sensor nodes topology, and mixed topology. In this paper, we propose a new plan for a WSN–RFID integrated network. The entire network is divided into clusters, and the clustering hierarchical routing algorithm is employed to send data from the head nodes to the base station. Further, we propose two algorithms to overcome redundant data on the hybrid network. Our simulation results demonstrate that the proposed method reduces redundant data and processing time compared with existing methods.

The article is devoted to the assessment of the impact of air transport on the development of the tourism industry. It has been established that air carriers around the world provide a significant share of international tourist trips and are dependent on fluctuations in tourist demand. It has been determined that the understanding of the need to study the degree of interdependence between the tourism and aviation business transforms traditional approaches to the study of tourism and aviation transport. The analyzed functional links between travel companies and airlines allowed asserting the formation of a specialized system, the logistics principles of which will enable people to maximize their mobility potential in the modern globalized world. It has been proved that the development of air transport becomes a decisive factor in the development of tourism, its driving force. For effective joint activities of airlines with tourist enterprises, it is necessary to develop such ways of their interaction that will allow them to function in a coordinated manner within the framework of a single chain of providing tourist services.

There are many ways to send and receive an electronic message, but SMS is more popular and nowadays used for one time password (OTP) as a part of authentication in many web applications, internet of things (IoT) access, password reset, mobile banking (M-banking), etc. Therefore, we must know how the protocol works and about its security. This protocol is designed to manage federatively (i.e., the mobile network is managing partially by many independent operators and it doesn’t need to have a central operator for the whole network. Also, many independent centrally managed networks can connect together to make a bigger network). We reviewed SMS protocol and its network structure, message structure, network entities, entities’ connection, and some security-related issues. Finally, this protocol is evaluated if it can provide Identification, Authentication, Integrity, Nonrepudiation, Confidentiality, and Availability.

Introducción: El capital humano determina el avance económico que puede presentar un país; establece que cuanto más cualificado o especializado sea, mayor serán los efectos positivos que se generen.Objetivo: Analizar el valor del capital humano en salud y su impacto como capital intelectual en el desarrollo de la salud pública cubana.Posicionamiento del autor: El sistema nacional de salud se ha ido desarrollando y fortaleciendo progresivamente desde el triunfo de la Revolución cubana en el año 1959. Esto demandó un progreso paralelo del sistema de formación y mejora de recursos humanos para la salud que posibilitó fortalecer la cualidad y pertinencia del desarrollo profesional y profesoral; brindó particular atención a la educación médica, la formación y el perfeccionamiento del capital humano en la salud pública en la modalidad de posgrado, como doctorados, especialidades, maestrías y otras formas organizativas de la docencia. Conclusiones: El capital humano constituye un activo intangible que tiene la capacidad de apoyar el incremento de la productividad, impulsar la innovación y con ello la competitividad. El concepto asumido para la práctica de la gestión del capital humano en Cuba comprende economía, ciencia y conciencia ética. La formación de los profesionales de la salud en Cuba es integral y humanista, y se ejecuta esencialmente en los servicios de salud y en la comunidad.

Introducción: La epidemia por COVID-19 en La Habana tuvo peculiaridades en su primer año de evolución que la diferencian de lo ocurrido en los demás territorios del país, por lo que se considera la influencia del lugar, el tiempo y las personas en su desarrollo.Objetivo: Describir las peculiaridades de la respuesta individual y comunitaria en el desarrollo de la epidemia por COVID-19 en La Habana en el año 2020.Métodos: Se realizó una investigación descriptiva retrospectiva en La Habana desde marzo hasta diciembre de 2020. Se tomó la información de 4913 personas diagnosticadas con COVID-19 en ese período. Las variables seleccionadas fueron casos confirmados, municipio de residencia, edad, sexo, fuente de infección, presencia de síntomas y estado al egreso. Se resumió la información mediante frecuencias absolutas, porcentajes y tasas.Resultados: Los municipios de Regla, Cotorro, Centro Habana y la Lisa presentaron tasas de incidencia superiores a la de la provincia. Los grupos de edad más afectados fueron el de 20 a 39 años y el de 40 a 59 con discreta diferencia en cuanto al sexo. El mayor riesgo de morir por COVID-19 lo presentaron la Habana Vieja, Cotorro, Plaza de la Revolución y Marianao con 4 %, 3,6 %, 3,8 % y 2 % de letalidad, respectivamente. Predominaron los pacientes asintomáticos y autóctonos excepto en los dos últimos meses del año.Conclusiones: La respuesta individual y comunitaria en el desarrollo de la epidemia en La Habana presentó peculiaridades relacionadas con su distribución territorial y las características de la población residente que estuvo expuesta al coronavirus.

Introducción: La responsabilidad médica estudiantil resulta una herramienta que no solo interpreta el mundo universitario de las ciencias médicas, sino que sirve para su transformación en responsabilidad médica profesional. Durante la carrera de Medicina el valor responsabilidad se debe desarrollar vinculado a basamentos legales.Objetivo: Abordar de forma reflexiva la variable responsabilidad legal en estudiantes de la carrera de Ciencias Médicas por la repercusión futura en el ejercicio de su profesión.Desarrollo: Se realizó una revisión en bases de datos certificadas para investigaciones en salud acerca de las definiciones y el tratamiento pedagógico de la responsabilidad médica hacia lo cual se dirigen las estrategias educativas. En su mayoría están enfocadas hacia el valor moral más que sobre los aspectos legales relacionados con el desempeño de la profesión una vez que los estudiantes egresan de nuestras universidades.Conclusiones: La concepción educativa propuesta para el desarrollo de la responsabilidad legal en estudiantes de ciencias médicas, además de los presupuestos filosóficos, sociológicos y psicopedagógicos debe integrar aspectos jurídicos. Estos deben ser abordados durante toda su formación, de manera tal que, se exponen las consecuencias y sanciones que se pueden derivar de una irresponsabilidad profesional y prevenir errores del futuro profesional de la salud cuyas consecuencias sean de índole penal, civil y/o administrativas.