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정순철,민병찬,전광진,이봉수,이정한,김철중,Chung, Soon-Cheol,Min, Byung-Chan,Jun, Kwang-Jin,Lee, Bong-Soo,Yi, Jeong-Han,Kim, Chul-Jung 대한인간공학회 2002 大韓人間工學會誌 Vol.21 No.3
In this study, emotion changes were induced by four imaginations- pleasantness, unpleasantness, arousal, relaxation and it was examined using subjective evaluation and analysis of the physiological signals of the central and autonomic nerve systems whether the intended emotions were appropriately achieved, and whether these emotion changes could be distinguished from the analysis of physiological signals. Each of the four imaginations was implemented on 32 subjects for 30 seconds, while that Electroencephalogram (EEG), Eelectrocardiogram (RSP) were measured, and a subjective evaluation was implemented following the completion of the measurement. The analysis of the subjective evaluation revealed that the subjects underwent the four clearly differentiated imaginations, and the pleasantness level was classified into four imagination stages, pleasantness>relaxation>arousal=comfort>unpleasantness, and arousal level was classified into four imagination stages in the order of arousal>unpleasantness${\approx}$pleasantness>comfort>relaxation. The analysis of the EEG revealed that three stages of pleasantness level, pleasantness>relaxation=arousal=comfort>unpleasantness were classified from the values of ${\alpha}/{\alpha}+{\beta}\;and\;{\beta}/{\alpha}+{\beta}$, and about tour distinguishable stages of arousal level were obtained from the autonomic nervous system responses following the order of arousal>unpleasantness${\approx}$pleasantness> comfort> relaxation. It was found that intended emotion could be induced from the imagination, and these induced emotion changes could be differentiated using the physiological signals of the EEG and autonomic nervous system.
고농도 산소가 덧셈과제 수행능력과 생리신호에 미치는 영향
정순철 ( Soon Cheol Chung ),임대운 ( Dae Woon Lim ) 한국감성과학회 2008 감성과학 Vol.11 No.1
This study investigated the effect of 40% oxygen administration on the addition task performance in three levels of difficulties and physiological signals. Ten male and female college students were selected as the subjects for this study. The experiment consisted of two runs: one was a addition task, with normal air (21% oxygen) administered and the other was with hyperoxic air (40% oxygen) administered. The experimental sequence in each run consisted of Rest1 (3 min), Task1 (1 min, one digit addition task), Task2 (1 min, two digit addition task), Task3 (1 min, three digit addition task), and Rest2 (4 min). Blood oxygen saturation and heart rate were measured throughout the five phases. The accuracy rates of the addition task were enhanced with 40% oxygen administration compared to 21% oxygen. Difference in the accuracy rates grew higher with the rise of difficulty. When 40% concentration oxygen is supplied, blood oxygen saturation increased and heart rate was decreased comparing to 21%. This study showed that the supply of high concentration oxygen increases blood oxygen saturation, which in turns accelerates brain activation resulting from cognitive process and enhances arithmetic abilities. Particularly when difficulty is high, demand for oxygen increases and, as a result, the effect of high concentration oxygen becomes more significant.
정순철 ( Soon-cheol Chung ),최미현 ( Mi-hyun Choi ),김형식 ( Hyung-sik Kim ) 한국감성과학회 2021 감성과학 Vol.24 No.1
A study was conducted on the effects of improving concentration by obscuring the peripheral vision using a blindfold that only covers the left and right sides of the field of view. The blindfold was trapezoidal in shape (5 × 4.8 cm in length and width) and was fixed to the left and right sides of the glasses with fixing clips. The material was a black-colored polypropylene (PP) and weighed 2.3 g including the clip. Qualitative and quantitative evaluations were performed on 50 healthy college students during the 15 days of using a blindfold. The qualitative analysis was performed utilizing a questionnaire regarding the improvement of concentration and the structure of the blindfold. EEG was measured while watching a learning video that required attention for quantitative analysis, and signal power and ERD/S analyses were performed for the mid β band (15-20 Hz) at the F4 position, which was the frontal lobe. The results showed that 40 of the 50 people reported improved concentration when they wore a vision shield, and 80% of the total subjects found it to be effective. From the quantitative evaluation, the ERS peak (p = 0.023) and the ERD + ERS peak value showed a significant difference (p = 0.017). In conclusion, concentration still improved even if only the left and right visual fields were used. Thus, it is expected that blindfolding could be used in various environments that require concentration.
정순철(Soon-Cheol Chung),이법이(Beob-Yi Lee),최미현(Mi-Hyun Choi),탁계래(Gye-Rae Tack),이봉수(Bongsoo Lee),엄진섭(Jin-Sup Eom),손진훈(Jin-Hun Sohn) 대한해부학회 2005 Anatomy & Cell Biology Vol.38 No.3
본 연구에서는 자기공명영상을 이용하여 20대와 40대 정상 한국인 뇌실의 표준 부피를 계측하고 연령과 성별에 따른 뇌실 부피의 차이를 알아보고자 하였다. 20대 118명(남자 58명, 여자 60명)과 40대 100명(남자 41명, 여자 59명) 총 218명을 대상으로 MR 뇌 영상을 획득하였다. 횡단면, 시상면, 관상면 세 단면 각각에 대해 자동과 수동의 방법을 병행하여 뇌실 부분을 분리하고 부피를 계측하였다. 연령과 성별에 따른 차이와 연령과 성별의 상호 작용 효과를 관찰하기 위해, 연령(2수준)과 성별(2수준)을 독립변인으로 한 이원 변량분석(twoway ANOVA)을 이용하여 통계처리를 수행하였다. 20대 한국인의 평균 뇌실 부피는 16.2 [cm3]이었고, 40대는 평균 23.1 [cm3]이었다. 20대와 40대 한국인 남자의 평균 뇌실 부피는 21.9 [cm3]이었고, 여자는 17.5 [cm3]이었다. 20대에 비해 40대가, 여자에 비해 남자의 뇌실 부피가 유의하게 컸다. 또한 연령이 증가할수록 남자의 뇌실 부피 증가가 여자에 비해 유의하게 컸다. 결론적으로 20대와 40대 정상 한국인의 뇌실 부피 계측 결과 연령과 성별에 따라 유의한 차이가 있었고 연령에 따른 뇌실부피 증가는 여자에 비해 남자가 더 컸다. The purpose of this study is to measure the standard volume of the ventricle of normal Koreans in their 20s and 40s and find out difference in the volume of the ventricle according to age and gender. We collected MR brain images from 118 people in their 20s (male 58, female 60) and 100 people in their 40s (male 41, female 59), so a total of 218 people. For each of sagittal, coronal and axial sections, the ventricular part was segmented using automatic and manual methods, and the volume was measured. In order to observe difference according to age and gender and to observe the interactive effect between age and gender, two-way ANOVA was carried out using age (2 levels) and gender (2 levels) as independent variables. The average volume of the ventricle of Koreans in their 20 s was 16.2 [cm3] and that of Koreans in their 40s was 23.1[cm3]. The average volume of the ventricle of male Koreans in their 20s and 40s was 21.9[cm3] and that of female Koreans was 17.5 [cm3]. The volume of the ventricle was significantly larger in Koreans in their 40s than those in their 20s, and in male Koreans than in female ones. Moreover, the increase of the volume of the ventricle with age was significantly larger in male Koreans than in female ones. According to the results of measuring the volume of the ventricle of normal Koreans in their 20s and 40s, the volume was significantly different according to age and gender, and the increase of the volume of the ventricle with age was significantly larger in men than in women.
공간 및 언어 과제 수행 시 소뇌의 편측화에 관한 뇌 기능 연구
정순철 ( Soon Cheol Chung ),손진훈 ( Jin Hun Sohn ),최미현 ( Mi Hyun Choi ),이수정 ( Su Jeong Lee ),양재웅 ( Jae Woong Yang ),이법이 ( Beob Yi Lee ) 한국감성과학회 2009 감성과학 Vol.12 No.4
The purposes of the study were to examine cerebellar areas and lateralization responsible for visuospatial and verbal tasks using functional Magnetic Resonance Imaging(fMRI). Eight healthy male college students(21.5±2.3 years) and eight male college students(23.3±0.5 years) participated in this fMRI study of visuospatial and verbal tasks, respectively. Functional brain images were taken from 3T MRI using the single-shot EPI method. All functional images were aligned with anatomical images using affine transformation routines built into SPM99. The experiment consisted of four blocks. Each block included a control task(1 minute) and a cognitive task(1 minute). A run was 8 minutes long. Using the subtraction procedure, activated areas in the cerebellum during the visuospatial and verbal tasks were color-coded by t-score. A cerebellar lateralization index was calculated for both cognition tasks using number of activated voxels. The activated cerebellar regions during the both cognition tasks of this study agree with previous results. Since the number of activated voxels of the left and right cerebellar hemisphere was almost same, there was no cerebellar lateralization for both cognition tasks.