상상으로 유발된 감성 변화에 관한 연구

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.

산소 공급으로 유발된 공간 인지 능력, 혈중 산소 농도, 심박동율의 변화

정순철(Soon Cheol Chung),손진훈(Jin Hun Shon),이봉수(Bongsoo Lee),이수열(Soo Yeol Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.1

Changes in visuospatial cognitive performance, blood oxygen saturation and heart rate due to the highly concentrated oxygen administration were observed in this study. Six male (25.8 ± 1.0) and six female (23.8 ± 1.9) adults were asked to perform 20 visuospatial tasks with the same level of difficulties by supplying two different oxygen levels (21%, 30%). Experiment consisted of Rest1 (1 min.), Control (I min.), Task (4 min.), and Rest2 (4 min.) and physiological signals such as blood oxygen saturation and heart rate were measured through each stage. The result showed the accuracy of task performance increased significantly at 30% oxygen concentration compared with 21 %, which means oxygen supply has positive effects on visuospatial cognitive performance. When 30% oxygen was supplied, blood oxygen saturation during control and task phases was increased and heart rate was decreased compared with 21 %. It means that 30% oxygen can stimulate brain activities by directly increasing the actual level of blood oxygen concentration during cognitive performance, and enough oxygen supply during cognitive performance make heart rate decrease.

20대와 40대의 공간 인지 능력, 대뇌 활성화 및 대뇌 편측화의 차이

정순철(Soon Cheol Chung),김윤성(Yun Sung Kim),유지혜(Ji Hye You),탁계래(Gye Rae Tack),이봉수(Bongsoo Lee),이정한(Jeong Han Yi),손진훈(Jin Hun Sohn) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.1

The present study purposed to examine differences between 20s and 40s in visuospatial performance, the number of activated voxels and cerebral lateralization using functional Magnetic Resonance Imaging (fMRI). For this study, eight college students in their twenties (21.5 years on the average) and six adults in their forties (45.7 years on the average) participated in the experiment. Functional brain images were taken from 3T MRI using the single-shot EPI method. Compared to the twenties the forties showed lower visuospatial performance and longer reaction time. In addition, compared to the twenties the forties had a smaller number of activated voxels and less cerebral lateralization. The results of this study show that people's visuospatial performance and number of activated voxels decrease with aging. In addition, they also suggest that cerebral lateralization decreases in order to supplement the lowering of visuospatial performance, which in tum symmetrizes the activation of the left and right hemisphere.

소속함수와 Dempster-Shafer 증거합 법칙을 이용한 긴장도 평가 알고리즘 개발

정순철 ( Soon Cheol Chung ) 한국감성과학회 2002 감성과학 Vol.5 No.1

30%의 고농도 산소가 정상 성인의 사이클 운동 시 심박동률과 혈중 산소 포화도에 미치는 영향

정순철 ( Soon Cheol Chung ),유지혜 ( Ji Hye You ),이정한 ( Jeong Han Yi ),손진훈 ( Jin Hun Sohn ) 한국감성과학회 2006 감성과학 Vol.9 No.1

착용형 시야 가리개가 집중력 향상에 미치는 영향

정순철 ( Soon-cheol Chung ),최미현 ( Mi-hyun Choi ),김형식 ( Hyung-sik Kim ) 한국감성과학회 2021 감성과학 Vol.24 No.1

본 논문에서는 시야의 좌측과 우측만 가리는 시야 가리개를 이용하여 주변 시야 가림에 따른 집중력 향상 효과에 대한 연구를 수행하였다. 사용한 시야 가리개는 가로와 세로 5 cm x 4 .8 cm 의 사다리꼴 모양으로 안경의 좌측과 우측에 고정 클립으로 부착할 수 있도록 하였다. 재질은 검정색의 폴리프로필렌(Polyprolylene)소재를 이용하였으며 클립을 포함하여 무게는 2.3 gram이었다. 건강한 20대 대학생 50명을 대상으로 15일간 시야 가리개를 사용하도록 한 후 정성평가와 정량평가를 수행하였다. 정성평가는 집중력 향상과 시야 가리개의 구조에 대한 설문조사로 진행하였다. 정량평가를 위하여 주의력 집중이 필요한 학습 동영상을 시청하도록 하면서 뇌파를 측정하였고 전두엽(frontal lobe) 영역인 F4 위치에 대한 Mid β 밴드(15~20Hz) 신호의 파워(power)와 ERD/S 분석을 수행하였다. 분석 결과 50명 중 80%인 40명이 시야 가리개를 착용하였을 때 집중력이 향상되었다고 보고하였다. 정량평가 결과 시야 가리개를 착용하고 동영상을 시청하였을 때 ERS peak(p=.023)와 ERD+ERS peak 값이 유의(p=.017)한 차이를 나타내었다. 결론적으로 좌측과 우측의 시야 가리개만을 사용하여도 집중력이 향상되는 결과를 도출하였다. 시야를 모두 가리는 덮개 형태 또는 시야의 상측과 하측을 가리지 않더라도 집중력을 향상시킬 수 있기 때문에 향후 간편한 방법으로 집중이 필요한 다양한 환경에서 활용이 가능할 것으로 기대된다. 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.

40% 농도의 산소 공급이 2-back 과제 수행에 미치는 영향

정순철(Soon-Cheol Chung),박하라(Ha-Ra Park),이봉수(Bongsoo Lee),탁계래(Gye-Rae Tack),이정한(Jeong-Han Yi),엄진섭(Jin-Sup Eom),손진훈(Jin-Hun Sohn) 한국인지과학회 2005 인지과학 Vol.16 No.3

연령과 성별에 따른 정상 한국인 뇌실의 계측학적 연구

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.

화상 시뮬레이터에서 속도변화에 따른 운전자의 감성 측정에 관한 연구

정순철 ( Soon Cheol Chung ),민병찬 ( Byung Chan Min ),김유나 ( Yu Na Kim ),신미경 ( Mi Kyong Sim ),김철중 ( Chul Jung Kim ) 한국감성과학회 2000 감성과학 Vol.3 No.2

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

본 연구에서는 공간 및 언어 과제를 수행하게 하면서 뇌 기능 영상을 획득하여, 각 인지 과제 수행에 따른 소뇌 활성화 영역을 알아보고, 소뇌 편측화의 차이를 규명하고자 한다. 8명의 오른손잡이 남자 대학생(평균 21.5±2.3세)과 8명의 오른손잡이 남자 대학생(평균 23.3±0.5세)이 각각 공간 및 언어 과제 실험에 참여하였다. 3T MRI 에서 single-shot EPI 기법을 이용하여 뇌 기능 영상을 획득하였다. 뇌 기능 영상 데이터는 SPM-99 S/W 를 사용하여 분석하였다. 실험은 네 개의 블록으로 구성되며, 각 블록은 통제과제(1분), 인지 과제(1분)을 포함하며, 한 실험당 소요시간은 블록당 2분씩, 총 8분이었다. 감산법을 이용하여 공간 및 언어 과제에 대한 소뇌 활성화 영역을 알아보았고, 소뇌의 활성화 voxel 수를 이용하여 소뇌의 편측화 지수를 계산하였다. 두 인지 과제 수행 시 활성화된 소뇌 영역은 선행 연구와 비교하여 유사한 영역이었다. 두 인지 과제 모두 좌, 우 소뇌 반구의 활성화 voxel 수가 비슷하여 소뇌 기능의 편측화가 나타나지 않았다. 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.