Flexible Authentication in Vehicular Ad hoc Networks

A Vehicular Ad-Hoc Network (VANET) is a form of Mobile ad-hoc network, to provide communications among nearby vehicles and between vehicles and nearby fixed roadside equipment. The key operation in VANETs is the broadcast of messages. Consequently, the vehicles need to make sure that the information has been sent by an authentic node in the network. VANETs present unique challenges such as high node mobility, real-time constraints, scalability, gradual deployment and privacy. No existent technique addresses all these requirements. In particular, both inter-vehicle and vehicle-to-roadside wireless communications present different characteristics that should be taken into account when defining node authentication services. That is exactly what is done in this paper, where the features of inter-vehicle and vehicle-to-roadside communications are analyzed to propose differentiated services for node authentication, according to privacy and efficiency needs

A bibliometric analysis of the presence of finances in high-impact tourism journals

The purpose of this study is to observe the presence of financial research applied to tourism during the 1995–2012 period. The Scopus database has been used for tourism journals indexed in Journal Citation Reports and the Mendeley reference manager was used to manage the results. Two hundred and fifty-two articles were selected with basically financial content. The results reveal that in the majority of cases empirical research typology was used; the subject matter that aroused most interest was corporate finances and, within this, financial management, value creation, capital structure and investment decisions

How can we encourage 11th grade students to improve their reading comprehension skill in English at high school Jose Martí in the evening session during the second semester 2014?

Currently, one of the principal assumptions that sustain the teaching of English as a foreign language is the privilege position it occupies as a vehicle for international communication. Nowadays Nicaraguans students have to be prepared to live in a world more open to progress, closer to different cultures and languages, going to the hand with the growing technology and economy etc., and this is achieved with foreign language acquisition in Media Basic education. “In addition to the lack of methodology to teach English in schools in Nicaragua, specialists in education point out to the needs of students to be autodidact that can complement the learning of the language beyond the lesson within the classroom” “The deficit of bibliographical resources and methodological resources affects the learning of English, according to the specialist in education, Mario Quintana, since he considered that the English cannot be taught without the books and other materials for educational support. …" (Castillo Bermudez, La Prensa, 2011) All this demand the necessity to have specialized teachers able to implement methods to facilitate the learning process of reading comprehension in EFL1, in order to have the students improve their reading skills. The methods for teaching English are very important to achieve good results in student learning, however, it is decided to speak and present the experiences and disadvantages found in the application of this research with 11th grade students on the evening sessions in the high school Jose Marti in La Trinidad, because although the methods have the best features and their realization was well-planned. Also should consider the character and disposition from the students, especially at this stage which are as we looked at students interacting together in this learning sessions. It was found that this topic (reading comprehension) is very interesting, because with the experience gather and the disposition of students at this level in the Institute Jose Marti, a greater awareness of the forms and processes that must be the most suitable for language learning in reading comprehension in English. However, the problems are very different from each other and also the problems vary according to different classrooms and social climates. To cope with these difficulties students need to make connections between prior knowledge and new information assisting the construction of meaning and comprehension. This is to ensure that the students build confidence and interest about learning to read English

A Ferrocene-Quinoxaline Derivative as a Highly Selective Probe for Colorimetric and Redox Sensing of Toxic Mercury(II) Cations

A new chemosensor molecule 3 based on a ferrocene-quinoxaline dyad recognizes mercury (II) cations in acetonitrile solution. Upon recognition, an anodic shift of the ferrocene/ferrocenium oxidation peaks and a progressive red-shift (Δλ = 140 nm) of the low-energy band, are observed in its absorption spectrum. This change in the absorption spectrum is accompanied by a colour change from orange to deep green, which can be used for a “naked-eye” detection of this metal cation

Lentes intraoculares trifocales: revisión bibliográfica

El objetivo del presente estudio ha sido evaluar y analizar resultados tanto clínicos como teóricos para proporcionar un mayor entendimiento del funcionamiento de las lentes intraoculares (LIOs) trifocales. Para ello, se ha realizado una búsqueda bibliográfica, incluyendo tanto artículos de simulaciones en banco óptico como aquellos que muestran resultados clínicos. En la búsqueda se han encontrado artículos sobre tres LIOs trifocales: AT.LISA tri839MP (Carl Zeiss Meditec), FineVision (PhysIOL) y MIOL-Record (Repper-NN). En los estudios teóricos se ha demostrado que las LIOs trifocales presentan una mejora con respecto a las LIOs bifocales en cuanto a visión intermedia pero con una disminución en cuanto a calidad óptica en distancias lejanas y cercanas. Por el contrario, en cuanto a resultados clínicos, las LIOs trifocales proporcionan buenas agudezas visuales en visión lejana y agudezas visuales variables pero siempre aceptables en visión intermedia y cercana. En conclusión, LIOs trifocales ofrecen una opción a aquellos pacientes que necesitan trabajar en visión intermedia y buscan no tener que depender del uso de gafas tras cirugía de catarata

La drogadicción y sus implicancias en el rendimiento académico de los estudiantes de la Facultad de Derecho y Ciencia Política en la Universidad Andina de Cusco, Filial Sicuani, durante el periodo 2019

En esta tesis titulada: “LA DROGADICCIÓN Y SUS IMPLICANCIAS EN EL RENDIMIENTO ACADÉMICO DE LOS ESTUDIANTES DE LA FACULTAD DE DERECHO Y CIENCIA POLITICA EN LA UNIVERSIDAD ANDINA DEL CUSCO, FILIAL SICUANI, DURANTE EL PERÍODO 2019”, investigación del cual se prevé que la drogadicción influye significativamente en el rendimiento académico que tienen los estudiantes de la Escuela Profesional de Derecho de la Filial de Sicuani de la Universidad Andina del Cusco, 2019. Por ello se desarrolló un estudio de alcance descriptivo, de diseño no experimental, donde tuvimos como universo de estudio a estudiantes de la Escuela Profesional de Derecho de la Universidad Andina del Cusco Filial Sicuani, 2019, donde finalmente un promedio de 50 estudiantes, 10 docentes y 10 padres de familia utilizando el método de encuesta para recopilar datos y el cuestionario como instrumento, se creó la muestra. Los hallazgos demuestran cómo el abuso de drogas afecta la capacidad de los estudiantes para funcionar académicamente en la Escuela Profesional de Derecho, Filial Sicuani de la Universidad Andina del Cusco, durante el periodo 2019, tal como se precisa que la gran mayoría de los encuestados consideran que cuando un estudiante tiene problemas de adicción en el DECE, ellos nunca tienen buenos resultados académicos, por otro lado, un poco menos de la mitad de los mismos encuestados, señalaron que algunas veces usan o usaron el tabaco siendo conscientes de las consecuencias de ello, finalmente, más de la mitad de encuestados de la Universidad Andina del Cusco detallaron que a lo largo de su vida, algunas veces consumieron bebidas alcohólicas, siendo esta por diferentes razones personales.In this thesis entitled: "DRUG ADDICTION AND ITS IMPLICATIONS IN THE ACADEMIC PERFORMANCE OF STUDENTS OF THE FACULTY OF LAW AND POLITICAL SCIENCE IN THE ANDEAN UNIVERSITY OF CUSCO, SICUANI BRANCH, DURING THE PERIOD 2019", research of which it is expected that drug addiction significantly influences the academic performance of students of the Professional School of Law of the Sicuani Branch of the Andean University of Cusco, 2019. For which a study of descriptive scope was developed, of non-experimental design, where we had as study universe students of the Professional School of Law of the Andean University of Cusco Sicuani Branch, 2019, where finally an average of 50 students, 10 teachers and 10 parents made up the sample, collecting data using the survey technique and having as an instrument the questionnaire. From the results obtained it is concluded that, drug addiction influences the academic performance of the students of the Professional School of Law, Sicuani Branch of the Andean University of Cusco, during the period 2019, as it is precise that most of the respondents consider that when a student has addiction problems in the DECE, they never have good academic results, on the other hand, a little less than half of the same respondents, pointed out that sometimes they use or used tobacco being aware of the consequences of it, finally, more than half of the respondents of the Andean University of Cusco detailed that throughout their life, sometimes they consumed alcoholic beverages, being this for different personal reasons

Despertar el interés por la lectura desde la clase de castellano

Este proyecto pedagógico muestra una problemática que se presenta en la educación y es que los alumnos no muestran interés en la lectura, leen porque les toca, por obligación, cuando a cosas académicas se refiere. Por esta razón, el docente debe aplicar diferentes estrategias para lograr que los alumnos se interesen por leer; su interés por la lectura no sólo depende de ellos, sino también de los padres, los docentes y la comunidad en general, todos deben motivados e incentivarlos por esta. Este problema lo pude comprobar con observaciones realizadas en el colegio Libertador Cajamag, jornada nocturna y en el Colegio Instituto Magdalena, jornada matinal, donde realicé observación directa, teniendo en cuenta el interés y la motivación de las alumnas y apliqué una encuesta para confirmar el problema

Consideraciones acerca de los contenidos y metodologías en los cursos de Química en la Educación Secundaria en Bogotá (Colombia)

La formulación de un nuevo currículo para los cursos de química general, impartidos en la Universidad Nacional de Colombia, nos llevó a indagar acerca de la química que se enseña en la secundaria y a analizar los contenidos en su coherencia y relación con los cursos universitarios. Los resultados muestran una gran intención de los profesores por impartir una química relacionada con la vida, pero muy abundante en contenidos formales y muy relacionada con los cursos universitarios de química. Las preferencias entre diversos temas no se relacionan directamente y se prevé que se privilegia una enseñanza teórica y preparatoria para la química universitaria. Esto motiva a pensar en un currículo alejado de presiones, como exámenes de ingreso o de cursos universitarios