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제 1회 과학상 모범사례 발표회-갯벌에 쏟은 집념의 승리
이성일,Lee, Seong-Il 한국과학기술단체총연합회 1979 과학과 기술 Vol.12 No.12
한국과학기술단체총연합회는 지난 12일 세종문화회관 소강당에서 79년도 전국민 과학화운동을 마무리하는 제 1회 과학화모범사례발표회를 가졌다. 서울시민과 학생등 7백여명이 참가한 이날 발표회에서는, 우수상 3명, 장려상 3명, 모두 9명에게 상장과 부상이 수여됐다. 다음은 일반부문ㆍ주부부문ㆍ학생부문등 3개부문의 우수상 수상 발표문이다.
이성일,Lee, Seong-Il 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.3
This study investigated human operator's perceptual and psychophysical responses to vibrotactile stimulation on various parts of the hand. Using a small vibrotactile display, the effects of three mechanical parameters consisting vibrotactile stimulations, i.e., vibration frequency, pulse-width modulation duty cycle, and number of contactors, on differential thresholds were examined at five different loci of the hand. It was observed that differential threshold varies with vibration frequency and number of active contactors. Differential sensitivity was the greatest at the vibration frequency of 120 Hz. The differential sensitivity was not found to be affected by loci on the hand. The area of stimulation on the hand was also found to be significant in that the sensitivity increased with the number of active contactors. It should be noted that the conclusions from this study generally correspond to those from the previous study on the absolute sensitivity. which means that tactile sensitivity to vibrotactile stimulations can be controlled with a systematic and consistent passion for emulating normal everyday contact on human hands in teleoperation and virtual reality applications.
이성일,Lee, Seong-Il 대한인간공학회 1998 大韓人間工學會誌 Vol.17 No.2
The objective of this study is to investigate hwnan operator's perceptual and psychophysical responses to vibrotactile stimulation on various parts of the hand. Using a small vibrotactile display, five different loci of the hand along with two other mechanical parameters consisting vibrotactile stimulations, which are vibration frequency and number of active contactors, were examined for the effects on absolute thresholds. All test variables were found to have significant effects on thresholds. It was observed that absolute threshold is a function of vibration frequency and number of active contactors. Tactile sensitivity was the greatest at the vibration frequency of 240 Hz, and the fingertip was found to be the most sensitive locus on the hand. The area of stimulation on the hand was also found to be significant in that the sensitivity increased with the number of active contactors. The results of the study generally supported those of other previous studies. It should also be noted, however, that the conclusions from the study should be limited to the absolute sensitivity, not to the suprathreshold intensities of normal everyday contact with the hands.