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鄭求仁(Gu-In Jung),田載燻(Jae-Hoon Jun),李康輝(Kang-Hwi Lee),宋旼宣(Min-Sun Song) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
Since conventional methods for measuring stride length(distance) are many weaknesses, optical methods have been developed to measure stride length(distance) of human pedestrians. IR(Infrared) elements and Power LED(Light Emitting Diode) with two types of lens were used to correlate detected light intensity with stride length(distance). The suggested methods in this study are simple, convenient, and cost effective. The results can be used to analyze walking patterns of normal and disabled men, and to monitor the recovering processes of the disabled patients.
김지원,정홍영,김효희,권유리,엄광문,이정환,김경섭,전재훈,박병규,Kim, Ji-Won,Jeong, Hong-Young,Kim, Hyo-Hee,Kwon, Yu-Ri,Eom, Gwang-Moon,Lee, Jeong-Whan,Kim, Kyung-Seoup,Jun, Jae-Hoon,Park, Byung Kyu 대한의용생체공학회 2012 의공학회지 Vol.33 No.4
Elderly women are reported to have greater risk of falls. The purpose of this paper was to investigate the possible gender differences in the reaction performance of ankle joint muscles, which have dominant role in the control of sagittal plane balance. Twenty-six elderly men and women with comparable mean age participated in this study. Reaction times to the audible beeps were measured in the tibialis anterior muscle and gastrocnemius muscle. Reaction time variables included premotor time, electromechanical delay and total reaction time. Gender difference in each reaction time was investigated by independent t-test. In both muscles, premotor time was longer in men but the electromechanical delay was longer in women (p < 0.05). Resulting total reaction time was longer in men in tibialis anterior muscle (p < 0.01) and it tended to be longer in men also in gastrocnemius muscle (p = 0.25). The results demonstrates that the overall reaction performances of elderly women is better than or comparable to those of elderly men in ankle joint muscles. This suggests that the reaction performance of ankle muscles is hardly the cause of the greater risk of falls in elderly women.
조영빈 ( Yeong Bin Cho ),김지선 ( Ji-sun Kim ),오한별 ( Han-byeol Oh ),전재훈 ( Jae-hoon Jun ) 조선대학교 공학기술연구원 2018 공학기술논문지 Vol.11 No.3
This study suggests a new method to detect color information without using spectrophotometer by optical element such as optical fiber, color sensor, and LED. This research aim is to develop a portable color information detection system. It detects the color information and wavelength of the sample in the CIE diagram. In this color information detection system, the wavelength can be calculated with any kind of samples including liquid and solid types without disturbance from surroundings because of selectively measuring reflection, absorption, and transmittance according to the state of the sample. It can be used a colorimeter and partially replace the function of a spectrophotometer.