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김인영,김희평,한종희,Sun I Kim,See Youn Kwon,Sung Hwa Hong,이상민,김동욱 대한의용생체공학회 2011 Biomedical Engineering Letters (BMEL) Vol.1 No.2
Purpose Speech perception in noise is one of most important factors which people with hearing loss desire for better hearing. This study aims to verify the effectiveness of sound training for speech perception enhancement in background noise. Methods In our experiments, persons with normal hearing listened sounds coming through a hearing loss simulator to make them experience hearing loss virtually. In the sound training, we used the spectral ripple noise that is highly correlated to the sensitivity of speech perception in quit and noise with normal hearing person, hearing impaired person,hearing aid user, and cochlear implant user. Fourteen normalhearing subjects participated in this study. To investigate the effect of the sound training, we divided the subjects into 2group “Training group”, “Non Training group”. Each group consists of 7 normal hearing persons (Training group: male-6, female-1, Non Training group: male-5, female-2). Results The effectiveness of sound training was evaluated by the threshold of spectral resolution discrimination and the threshold of Speech perception. It was also statistically analyzed by Wilcoxon Signed test (*p<0.05). In training group, spectral resolution has improved from 8.6 ripple per octave (RPO) to 13.6 RPO. Speech perception in white noise has improved from -4.6 dB to -7.7 dB. In addition, speech perception in babble noise has improved from -4.3 dB to -7.4dB. The results were statistically significant in the training group. On the other hand, non-training group improved spectral resolution from 8 RPO to 8.4 RPO, but this result did not show statistical significance. Also speech perception in both babble and white noise did not show statistical significance. Conclusions Our results suggest that the perceptual improvement of spectral-component dissolving is significantly reflects to the speech perception in noise.
니코틴 중독의 단서노출치료를 위한 가상환경의 제작 및 욕구 유발 시험
김광욱 ( Kwang Uk Kim ),조원근 ( Won Geun Cho ),구정훈 ( Jeon Hun Ku ),김훈 ( Hun Kim ),김병년 ( Byoung Nyun Kim ),이장한 ( Jang Han Lee ),김인영 ( In Y. Kim ),이종민 ( Jong Min Lee ),김선일 ( Sun I. Kim ) 한국감성과학회 2002 추계학술대회 Vol.2002 No.-
Research has shown that many smokers experience an increase in the desire to smoke when exposed to smoking-related cues. Cue exposure treatment (CET) refers to the manualized, repeated exposure to smoking-related cues, aimed at the reducing cue reactivity by extinction. In this study, we constructed a virtual reality system for evoking a desire of nicotine, which was based on the results of a Questionnaire of Nicotine-craving. And we investigated the effectiveness of the virtual reality system as compared to classical device (pictures). As a result, we reached the conclusion that virtual reality elicits more craving symptoms than the classical devices.
Blood Pulsation의 효과가 뇌 활성화에 미치는 영향을 알아보는 방법
이원호,구정훈,이형래,한기완,박진식,김재진,윤강준,김인영,김선일,Lee, W.H.,Ku, J.H.,Lee, H.R.,Han, K.W.,Park, J.S.,Kim, J.J.,Yoon, K.J.,Kim, I.Y.,Kim, S.I. 대한의용생체공학회 2007 의공학회지 Vol.28 No.3
BOLD T2*-weighted MR images reflects cortical blood flow and oxygenation alterations. fMRI study relies on the detection of localized changes in BOLD signal intensity. Since fMRI measures the very small modulations in BOLD signal intensity that occur during changes in brain activity, it is also very sensitive to small signal intensity variations caused by physiologic noise during the scan. Due to the complexity of movement of various organs associated with heart beat, it is important to reduce cardiac related noise rather than other physiological noise which could be required with relatively simple method. Therefore, a number of methods have been developed for the estimation and reduction of cardiac noise in fMRI study. But, each method has limitation. In this study, we proposed a new estimation method for brain activities influenced by blood pulsation effect using regression analysis with blood pulsation signal and the correspond slice of fMRI. We could find out that the right anterior cingulate cortex and right olfactory cortex and left olfactory cortex were largely influenced by blood pulsation effect for new method. These observed areas are mostly on the structure of anterior cerebral artery in the brain. That is convinced with that our method would be valid and our new method is easier to apply in practice and reduce computational burden than the retrospective method.
조원근 ( Won Geun Cho ),김광욱 ( Kwang Uk Kim ),구정훈 ( Jeong Hun Ku ),이장한 ( Jang Han Lee ),김인영 ( In Y. Kim ),김선정 ( Sun Jeong Kim ),강윤주 ( Youn Joo Kang ),유태원 ( Tae Won Yu ),김선일 ( Sun I. Kim ) 한국감성과학회 2002 추계학술대회 Vol.2002 No.-
연구목적: 닌텐도 위를 이용한 가상현실기반 비디오게임 프로그램을 만성기 뇌졸중 환자에게 적용하여 균형능력 및 일상생활동작에 어떠한 영향을 미치는지 알아보고, 뇌졸중 환자의 재활프로그램으로서 적용 가능성이 있는지 알아보고자 한다. 연구방법: 만성기 뇌졸중 환자를 무작위로 가상현실기반 비디오게임 프로그램을 적용한 실험군(n=7)과 적용하지 않은 대조군(n=10)으로 구분하여 연구를 진행하였다. 연구에 참여한 모든 대상자에게 30분의 Bobath therapy와 15분간의 FES 치료를 기본적으로 실시하였다. 이에 더하여 실험군은 가상현실기반 비디오게임 프로그램을 1일 30분이내, 주 5회, 3주간 실시하였다. 대조군은 자전거 운동과 보행훈련으로 30분간 시행하였다. 실험 전 후 눈뜨고 외발서기(OLST; open leg standing test), Timed Up and Go(TUG) 검사, 10m 걷기 검사, Functional Independence Measure(FIM)를 측정하였다. 실험 전과 실험 후 측정값의 차이를 비교하기 위해 Wilcoxon Signed Ranks Test를 실시하였다. 그리고 각 측정값의 변화량에 대한 실험군과 대조군 사이의 차이를 알아보기 위해 Mann-Whitney U Test를 실시하였다. 연구결과: 실험결과는 다음과 같다. 1) 실험군에서는 FIM의 유의한 증가와 TUG, 10m 걷기 검사의 유의한 감소를(p<.05) 보였다. 대조군에서는 OLST의 증가와 TUG, 10m walking test의 감소가 나타났지만 통계적으로 유의하지 않았다. 오직 FIM에서만 유의한 증가가 나타났다(p<.05). 2) 실험 전 후의 실험군과 대조군의 각 측정값들의 평균차를 비교한 결과 실험군은 대조군보다 실험 전 후 OLST, TUG, 10m walking test 차이의 평균은 컸지만 통계적으로 유의하지 않았다. 결론: 이상의 결과로부터 가상현실기반 비디오게임이 만성기 뇌졸중 환자의 동적균형능력 및 일상생활동작 향상에 효과가 있음을 알 수 있었다.