Developing the concept of international education: Sixty years of UNESCO history

This article is an analysis of official UNESCO documents—General Conference resolutions and Executive Board decisions for the period 1946 to 1999—that address international education. It shows that international education has been key to UNESCO’s mission since the organization began, and illustrates various trends in its acceptance and implementation. It argues that, because such education is essential to academic and technical progress, it must be incorporated in all the activities and materials of any educational system. It also argues that implementing it as UNESCO has recommended can relieve many types of conflict.     

Del pensamiento formal a las concepciones espontáneas: ¿Qué cambia en la enseñanza de la ciencia?

Resumen

En los últimos años se han desarrollado dos concepciones distintas del alumno adolescente en relación con la enseñanza de la ciencia. Por un lado, se ha analizado a los alumnos en términos de su capacidad para el pensamiento formal y, por otro, se han descrito innumerables concepciones espontáneas desviadas que los alumnos adolescentes poseen con respecto a los fenómenos científicos. El presente artículo revisa y compara los fundamentos epistemológicos y psicológicos de ambos enfoques, además de revisar las implicaciones didácticas que se derivan de cada una de esas posiciones para la enseñanza de la ciencia.     

Instrucción,aprendizaje e interacción profesor-alumno. Un estudio de observación en el aula

Resumen

Este trabajo aborda el estudio de la incidencia de los procesos de enseñanza en el aumento de conocimientos y destrezas de un grupo de niños paralíticos cerebrales en los primeros ciclos de enseñanza formal. Ello se hace a través de la puesta en relación de la ganancia que los sujetos manifiestan en sus rendimientos en una prueba criterial con datos de observaciones sobre las actividades realizadas en el aula. Los resultados muestran la existencia de un progreso en todas las áreas evaluadas, sin que parezca influir el nivel de afectación motora o del habla. Se observa que sólo menos de un tercio de las tareas escolares se plantean por encima del nivel de conocimientos previos del alumno, en estos casos la forma de interacción entre alumno y profesor toman características peculiares que permiten caracterizar la forma de trabajo en la zona de desarrollo próximo.     

Effect of bike-fit in the perception of comfort,fatigue and pain

ABSTRACT

The aim of this study was to assess the influence of different bike positions on the perception of fatigue, pain and comfort. Twenty cyclists underwent three tests that involved cycling for 45 min at their individual 50% peak aerobic power output while adopting different positions on the bike. Participants performed the cycling tests adopting three positions defined by two parameters (knee flexion angle [20°, 30°, 40°] and trunk flexion angle [35°, 45°, 55°]) in random order. Angles were measured using a 2D motion analysis system during cycling and applying Fonda’s correction factor. Perceptions of comfort, fatigue and pain were reported before the end of each test. The combination of 40° knee flexion and 35° trunk flexion was perceived as the most uncomfortable position. Moreover, greater knee flexion had a negative effect on trunk comfort, accompanied by greater levels of fatigue and pain perception in the anterior part of the thigh and knee. In conclusion, cyclists perceived the most comfortable position to be when the saddle height was within the recommended knee angle (30° calculated from the offset position or 40 ± 4.0° of absolute value). Upright trunk was found to be the most comfortable position for recreational cyclists, where aerodynamics is not so important. Cyclists’ bike perceptions should be taken into account when it comes to choosing the most beneficial position, since this can play a role in injury prevention and enhance cycling performance.     

Attitudes of the cultural tourist: a latent segmentation approach

As a result of globalization, the widespread use of ICTs, and advances in transport infrastructure, tourism destinations have to confront an increasingly competitive setting. When to this one adds the saturation of some of the original markets, the consolidation of traditional coastal destinations, and changes in client preferences and habits, it is not surprising that cultural tourism is being seen as having considerable growth potential over the next few years. In this context, policy-makers have been striving to better understand the cultural tourism market by attempting to segment their clients so as to adapt their offer to the client’s needs and leave the client satisfied with the experience. Unfortunately, most studies on cultural tourism segmentation have been purely psychographic. While this can help to explain attitudes, it fails to identify, access, and quantify segments, and is of little use for implementing specific strategies. The aim of the present work was to study the influence of socioeconomic and demographic variables (age, academic level, expenditure on tourism, inter alia) on the predisposition to choose cultural tourism (the “culturophile tourist”). To this end, we have developed a novel methodological approach and applied it to the results of a survey conducted by Andalusia’s Middle Towns Initiative. The approach uses the latent variables resulting from a latent class analysis to estimate log-linear models.     

Modeling the appeal of movie features to demographic segments of theatrical demand

Various studies have built models, using aggregate box-office data, to predict the contribution of a motion picture’s features to its theatrical demand. But such an approach fails to represent the heterogeneous influence of movie features on demographic groups and is unable to assist market-segmentation decisions. We propose and illustrate a new approach for modeling the appeal of movie features to market segments via the use of appropriate individual-specific data and canonical correlation analysis. Specifically, through demographically detailed movie-attendance data available in Spain, we build a model of how movie features influence the demographic composition of audiences. Via a canonical correlation analysis, we identify four dimensions underlying the relationships between several movie features (country of origin, genre, objectionable content, stars, promotional effort, and critical evaluations) and audience demographics (gender, age range, presence of children, education, social class, and size of municipality). These dimensions represent the strong pairings between four moviegoer demographic profiles and four movie-feature profiles. Our approach can potentially aid in segmentation and green-lighting decisions by matching movie features with the most relevant segment-specific preferences.     

Disinfection by-products effect on swimmers oxidative stress and respiratory damage

Disinfection by-products (DBPs) are generated through the reaction of chlorine with organic and inorganic matter in indoor swimming pools. Different DBPs are present in indoor swimming pools. This study evaluated the effects of different chlorinated formations in oxidative stress and lung damage in 20 swimmers after 40?min of aerobic swimming in 3 indoor pools with different characteristics. Biological samples were collected to measure lung damage (serum-surfactant-associated proteins A and B), oxidative stress parameters (plasma protein carbonylation and malondialdehyde, and whole-blood glutathione oxidation), and swimming exertion values (blood lactate) before and after exercise. Free chlorine and combined chlorine in water, and chlorine in air samples were determined in all the swimming pools. Chlorination as disinfection treatment led to the formation of chloramines in water samples, mainly mono- and dichloramine. However, free chlorine was the predominate species in ultraviolet-treated swimming pool. Levels of total chlorine increased as a function of the swimming activity in chlorinated swimming pools. The lower quality of the installation resulted in a higher content of total chlorine, especially in air samples, and therefore a higher exposure of the swimmer to DBPs. However, the concentration level of chlorinated DBPs did not result in significant variation in serum-surfactant-associated proteins A and oxidative stress parameters in swimmers. In conclusion, the quality of the installation affected the DBPs concentration; however, it did not lead to lung epithelial damage and oxidative stress parameters in swimmers.     

Science Letters：Visual odometry for road vehicles —— feasibility analysis

Estimating the global position of a road vehicle without using GPS is a challenge that many scientists look forward to solving in the near future. Normally, inertial and odometry sensors are used to complement GPS measures in an attempt to provide a means for maintaining vehicle odometry during GPS outage. Nonetheless, recent experiments have demonstrated that computer vision can also be used as a valuable source to provide what can be denoted as visual odometry. For this purpose, vehicle motion can be estimated using a non-linear, photogrametric approach based on RAndom SAmple Consensus (RANSAC). The results prove that the detection and selection of relevant feature points is a crucial factor in the global performance of the visual odometry algorithm. The key issues for further improvement are discussed in this letter.