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이기도,조병준,윤창진,이민형,김헌수 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1
In this study, we kinematically compared and analized the features of movement at punt kick of 6 rugby players and 6 non-players. The outcome is as following; 1. On the anterior-posterior direction of the joint velocity, players and non-players showed similar change. They showed the tendency of decrease from touching the ground to impact, but increase in the vertical direction velocity. 2. On the angular velocity, players and non-players didn't show much difference in the ankle at the moment of impact. Players showed remarkable increase in the knee and in the hip joint. 3. On the ground reaction force of anterior-posterior direction, players showed distinguished increase at the two peaks. On that of vertical direction, players showed outstanding increase at the second peak. And non-players showed longer supporting time than players. This study was peformed about kinematic variables of rugby punt kick such as force, position, velocity, and angle of supporting foot. It's necessary to study other kinematic variables like launch angle, velocity, moved distance of the ball along with those studied in this research in further studies.
궤환선형화 기법을 이용한 PWM 컨버터의 순시전압 제어
이지명,이기도,이동춘 전력전자학회 1999 전력전자학회 논문지 Vol.4 No.2
PWM 컨버터에서 직류출력전압의 빠른 응답을 위해 입력 및 출력의 전력평형개념을 시스템 모델링에 도입하는 것이 바람직하다. 이 경우 시스템은 비선형이 되며 제어기 설계가 용이하지 않다. 본 논문에서는 입출력 궤환선형화 기법을 응용하여 시스템의 비선형성을 제거하였으며 그 결과 빠른 전압응답특성을 얻을 수 있었다. 또한 작은 용량의 전해커패시터를 사용하더라도 부하변동에 대해 직류출력전압을 일정하게 유지하는 것이 가능함을 보였다. For fast response of the dc output voltage in P\hi1'v1 converter, it is desirable that the relation of power balance of the i input and output terminals is introduced to the system modeling. In this case, controller desi밍1 is not easy since the m model is nonlinear. In this paper, a nonlinear control them${\gamma}$ using input-output feedback linearization is used to solve t the nonlinear problem of the system. By nonlinear control. the voltage transient response can be faster, and it is also p possible to control the output voltage to be constant with smaller output filter capacitance for load disturbance.
김진숙,이기도,지연숙 한국청각언어재활학회 2010 Audiology and Speech Research Vol.6 No.1
Frequency characteristics of 583 Korean meaningful monosyllabic words were analyzed to improve understanding of speech recognition ability based on the hearing configuration. Twenty Korean young adults (10 males & 10 females) with normal hearing produced 583 words in context situations. Data were collected by using Computerized Speech Lab (CSL 4300B) and analyzed by using Praat 4.3.14. The analysis according to vowels and final consonants of the Korean meaningful monosyllabic words showed frequency differences depending on the initial consonants. Therefore, the words were analyzed based on the initial consonants. The mean frequency of intial consonants of /ᆨ/ was 1,560.17 Hz, /ᆩ/ was 1,957.07 Hz, /ᆫ/ was 241.09 Hz, /ᆮ/ was 4,154.06 Hz, /ㄸ/ was 4,263.33 Hz, /ᆯ/ was 288.22 Hz, /ᆷ/ was 245.04 Hz, /ᆸ/ was 1,402.02 Hz, /ㅃ/ was 1,409.95 Hz, /ᄉ/ was 4,965.60 Hz, /ᄊ/ was 5,937.91 Hz, /ᄋ/ was 1,406.87 Hz, /ᄌ/ was 4,617.41 Hz, /ᄍ/ was 4,998.60 Hz, /ᄎ/ was 4,584.13 Hz, /ᄏ/ was 1,351.06 Hz, /ᄐ/ was 4,202.87 Hz, /ᄑ/ was 1,363.12 Hz, and /ᄒ/ was 1,407.43 Hz. These results can be used clinically for better audiological assessment and rehabilitation. However, more data should be investigated systematically for appropriate clinical application in the future.