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Artigo em Inglês | MEDLINE | ID: mdl-34300117


This study aims to establish the basis for the institutional implementation of the 0th period physical education class to promote the health and academic performance of Korean teenagers. To achieve this goal, this study determined the impact of middle school students' participation in physical activities during the 0th period on perceived enjoyment and learning attitude. To examine the model, 282 questionnaires were collected from middle school students in a metropolitan city in South Korea. The samples were obtained using the convenience sampling method, and correlation analysis and structural equation modeling were performed using SPSS 21.0 and Amos 21.0. The findings are as follows: first, the participation of middle school students in physical activities during the 0th period had a statistically significant effect on perceived enjoyment. Second, perceived enjoyment had no statistically significant effect on learning attitude. Third, participation was shown to have a significant effect on learning attitudes. These findings supported the academic basis for the implementation of the 0th period physical education class for middle school students and application of practical measures to encourage their participation.

Educação Física e Treinamento , Prazer , Adolescente , Atitude , Humanos , República da Coreia , Instituições Acadêmicas , Estudantes , Inquéritos e Questionários
Sensors (Basel) ; 14(9): 16117-27, 2014 Aug 29.
Artigo em Inglês | MEDLINE | ID: mdl-25177804


The objective of the present study was to deal with the rotordynamics of the rotor of an ultra-high speed PM type synchronous motor-generator for a 500 W rated micro gas turbine generator. This paper introduces dynamic analysis, and experiments on the motor-generator. The focus is placed on an analytical approach considering the mechanical dynamic problems. It is essential to deal with dynamic stability at ultra-high speeds. Unbalance response analysis is performed by calculating the unbalance with and without balancing using a balancing machine. Critical speed analysis is performed to determine the operating speed with sufficient separation margin. The unbalance response analysis is compared with the experimental results considering the balancing grade (ISO 1940-1) and predicted vibration displacement with and without balancing. Based on these results, a high-speed motor-generator was successfully developed.

J Exerc Rehabil ; 10(2): 106-10, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24877046


The purpose of this study is to provide planning methods for leisure activity program to prevent the elderly's deviance, using the program components and protocol factors. This section discusses the results obtained through document analysis and Delphi technique. First, the components of leisure activity program were classified into five stages such as definition, condition analysis, program composition, application and evaluation. Second, the protocol factors in each stage of leisure activity program for the elderly's deviant prevention were 19 main themes and 75 sub-themes respectively. In the stage of condition analysis, five main themes such as deviant prediction, individual, socio-demographic, social and cultural factors and 25 sub-themes were found. Program composition included three main themes, facilities, instructor and program and 16 sub-themes and in the application stage, there were three key themes, facilities, instructor and program and 14 sub-themes. Lastly, the evaluation found four main themes such as deviant prevention, participation in leisure activities, management and wellbeing and 16 sub-themes.