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오정환,송숙근,강지훈 대한수면연구학회 2017 Journal of sleep medicine Vol.14 No.2
Sleep disorders are commonly observed in multiple systemic atrophy (MSA). The rapid eye movement (REM) sleep behavior disorder (RBD) is characterized by loss of normal voluntary muscle atonia during REM sleep. It usually presents during early course, and disappears over the course of disease progression. Sleep-disordered breathing (SDB) is also common sleep disorder in MSA which can be life-threatening, and continuous positive airway pressure (CPAP) treatment is useful in these patients. A 74-year-old woman with MSA presented for nocturnal respiratory disturbance. She had a five-year history of dream enacting behaviors, which had disappeared four months prior. Polysomnography revealed frequent stridor and sleep hypopnea. During the following full nigh CPAP titration for SDB, dream enacting behavior was observed during REM sleep stage. In MSA patients with SDB, CPAP administration may lead to increase REM sleep stage. An increase in REM sleep stage, which previously had been deprived, may have trigger RBD symptoms to reappear. The CPAP treatment should be considered with great caution in these patients.
오정환 한국문화관광학회 1999 문화관광연구 Vol.1 No.1
The Convention Industry came to have footlights as a high supplement industry owing to the expansion of international cooperation and mutual interchange. The demands of the convention Industry is upsurging and the scale of it is enlarged. Now many countries focus on the convention as one of the chief industries. Because of the tendency of globalization, Convention(MICE : Meetings, Incentive Travels, Conventions, Expositions) Industry has high priority among many Industries as a main income source by entertaining foreign tourists. The purpose of this article is to establish a theory for Food & Beverage Facilities of Convention Center, and to conceptualize the efficient operation of convention F&B facilities. Through the critical overview of the related literature the overall concept, kind of considerations of International convention industry studies were delineated. This study is composed of five parts; Ⅰ. Introduction to the purpose and method of this study Ⅱ. The change environment of convention industry in Korea Ⅲ. Framework of the theory Ⅳ. The efficient operation for F&B Facilities of Convention Center Ⅴ. Conclusions The author hopes advancements of this study, and utilization of study results to the empirical study.
오정환,최수남,정익수 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1
C. H. OH, S. N. CHOI, I. S. JEONG. Kinematic Analysis of the Badminton Drop-shot Motion. Korean Journal of Sport Biomechartics, Vol. 15, No. 1, pp. 221-235, 2005. The purpose of this study was to analyse badminton players' drop-shots, in order to make players understand the principles of drop-shot motion in badminton. Three dimensional analysis was used to measure movements such as the time required per section, the change of center of gravity, joint angle and speed, and joint speed. The results of this study revealed as follows: (1) top players are faster than amateurs in the total time required per section; (2) top players moved more in the x-axis and z-axis, while amateurs moved more in the y-axis; (3) the inclination of amateurs was greater than that of top players in all phases; (4) amateurs showed larger angle on the shoulder joints than top players in the first phase, while top players showed larger angle on the shoulder joint than amateurs in the second and third phase. Amateurs' angle was larger on angle joint in the first phase than top players' ones, while top players' angle was larger in the third phase than amateurs; (5) the speed of racket head of top players was faster than that of amateurs; and the velocity of the center of gravity of amateurs was greater than that of the top players. The findings of this study were that gravity decreases during impact and then the velocity increases to perform the follow-through and making the swing fast by increasing the speed of the racket head is most important.