http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
차일환 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1
The sound transimission loss of the single wall is mainly determined by its area density. Theoretically the determination of the sound transmission loss depends on the Mass law. There are several kinds of the theoretical eqations which are concerned with sound transmission loss. The result of computation from the six equations which are related with sound transmission loss. Fifty seven area densities are used for the computation of the sound transmission loss. Three equations of the mean sound transmission loss are applied to the fifteen area density to get the mean value of the sound transmission losses. As a results to get the sound transmission loss the equation that is applied should differ in accordance with the area density.
골프대회에 참가한 남자 대학 골프선수들의 심박변이도에 관한 연구
차일환,조상우,안창식,김성준 한국골프학회 2017 골프연구 Vol.11 No.4
[Purpose] The purpose of this study is to provide basic data necessary for golf psychology training by comparing the heart rate variability of male amateur and professional athletes participating in golf tournament at university. [Method] Stress index, HRV, LF, HF, and heart rate were measured and analyzed by pulse wave measurement before and after the first day to fourth day of competition. [Result] In the interaction of the two groups according to the measurement items, there was a significant difference in the 3rd and 4th day games on stress index, in the 1st day, 3rd day and 4th day games on HRV, in the 3rd day of the game on HF and in the 4th day on the heart rate per minute. [Conclusion] The change of heart rate variability were confirmed by measuring the pulse wave before and after the competition during the competition of university amateur and professional athlete. In future studies, it will be a research that will help golf players improve their performance if studies based on age, gender, etc. are carried out. [목적] 본 연구는 대학 골프대회에 참가한 남자 아마추어와 프로 선수들을 대상으로 대회 기간 중 맥파 측정을 통하여 심박변이를 비교분석하여 골프심리 기술훈련에 필요한 기초자료를 제공하는데 그 목적이 있다. [방법] 결과 도출을 위해 시합 전날 안정시와 시합이 진행되는 1일차에서 4일차 동안의 시합 전과 후에 맥파 측정을 통해 스트레스 지수, 심박변이도(HRV), 교감활성(LF), 부교감활성(HF), 분당심박수를 측정하여 분석하였다. [결과] 측정 항목별 두 집단의 상호작용에 있어 스트레스 지수는 3일차와 4일차 경기에서 유의한 차이, HRV는 1일차, 3일차, 4일차 경기에서 유의한 차이, HF(부교감신경)는 3일차 경기에서 유의한 차이, 분당심박수는 4일차에서 시기에 따라 유의한 차이가 나타났다. [결론] 대학 골프 아마추어와 프로선수의 대회 기간 중 경기 전후 맥파 측정을 통한 생리적 반응을 분석하여 심리적 변화를 확인할 수 있었다. 향후 연구에 있어서는 연령, 성별 등을 고려한 연구가 진행된다면 골프선수들의 경기력 향상에 도움이 되는 연구가 될 것으로 사료된다.
차일환,박규태,임광호 한국음향학회 1983 韓國音響學會誌 Vol.2 No.1
An irregulary formed chamber was designed and constructed to recognize the direct sound radiated from the sound source and the reflected sound from the walls of the chamber. The sound signal used was tone burst in the frequency response characteristics with the signal detection after transient effect. The direct wave, transient phenomena and the primary reflected sound could be asiily distinguished each other by measurements of the arrival time of the time difference. And also noise could be easily distinguished by the same method. The result obtained can be used in industries for automatic measurement of the sound pressure reponse characteristics with respect to frequencies.