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시각자극에 대한 실시간 및 비 실시간 주관적 평가와 생리반응과의 상관관계
정순철,민병찬,민병운,김상균,오지영,김유나,김철중,박세진,Jeong, Sun-Cheol,Min, Byeong-Chan,Min, Byeong-Un,Kim, Sang-Gyun,O, Ji-Yeong,Kim, Yu-Na,Kim, Cheol-Jung,Park, Se-Jin 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.3
The purpose of this study was to approve the capability of human sensibility evaluation based on physiological responses and real-time subjective assessments. Three well-trained healthy human subjects were participated in the experiments. We measured physiological responses such as Heart Rate Variability(HRV), Galvanic Skin Response(GSR) and skin temperature under rest and visual stimulation conditions, respectively. Off-time subjective assessments were recorded before and after visual stimulations. Real-time subjective assessments were recorded during visual stimulations. The results of physiological responses and off-time and real-time subjective assessments were quantified and compared. The results showed that the correlation between physiological responses and real-time subjective assessments was high (83%) for both the positive and negative visual stimulation. The correlation between the physiological responses and off-time subjective assessments was high (83%) for the negative visual stimulation but was low (15%) for the positive visual stimulation. Although the current observation is preliminary and requires more careful experimental study, it appears that the correlation between real-time subjective assessment and physiological responses is higher than that of the off-time subjective assessment and physiological responses.
군사학과 학생의 자기 통제력과 스트레스 대처방식이 스마트폰 중독수준에 미치는 영향
정순철,이영선,Jung, Sun-cheol,Lee, Young-sun 한국융합보안학회 2015 융합보안 논문지 Vol.15 No.3_2
The purpose of this study was to determine the status using the smartphone targeting millitary lesson students, and self-control and coping investigate the influence on smartphone addiction level. The results were also analyzed were to affect this age of smartphones college hours per day using a smartphone to an hour or more self-important 95.3% in individual daily levels of smartphone addiction to sex differences. Smartphone addiction levels showed a higher female than male students, the higher the self-control and self-control over the smartphone results of analyzing the relationship between addiction smartphone addiction has been analyzed to be lowered. In addition, even between coping and smartphone addiction emerged as significant results. In conclusion, the self-control necessary for use in smartphones and use time period, and this was demonstrated that coping problem-oriented coping strategies are required. Were discussing the implications of the study on the basis of these findings, we discuss the future research challenges and limitations. 본 연구의 목적은 군사학과 학생을 대상으로 스마트폰 사용실태를 파악하고, 자기통제력과 스트레스 대처방식이 스마트폰 중독 수준에 영향을 미치는가를 알아보았다. 결과는 대학생의 스마트폰 사용기간이 1일 기준 사용시간이 1시간 이상자가 95.3%로 스마트폰이 개인 일상생활에 중요하게 영향을 미치는 것으로 분석되었으며, 성별에 따른 스마트폰 중독 수준의 차이도 있었다. 스마트폰 중독 수준은 여학생이 남학생 보다 더 높은 것으로 나타났으며, 자기통제력과 스마트폰 중독 간의 상관관계를 분석한 결과 자기통제력이 높을수록 스마트폰 중독은 낮아지는 것으로 분석되었다. 또한 스트레스 대처방식과 스마트폰 중독 간에도 유의미한 결과로 나왔다. 결론적으로 스마트폰 사용기간과 사용시간에 대하여 자기통제력이 필요하며 스트레스 대처방식이 문제 지향적 대처방식이 요구된다는 것을 실증 하였다. 이러한 연구결과를 토대로 연구의 함의를 논의 하였으며, 추후 연구과제와 한계를 논의하였다.
정순철,민병찬,민병운,김유나,신미경,김철중,Jeong, Sun-Cheol,Min, Byeong-Chan,Min, Byeong-Un,Kim, Yu-Na,Sin, Mi-Gyeong,Kim, Cheol-Jung 대한인간공학회 2001 大韓人間工學會誌 Vol.20 No.1
Conventionally the subjective assessment for measuring the human sensibility is always performed after an experiment or a stimulus is terminated. This aftermath method can not. exactly, reflect the human sensibility which is produced at the moment of the presentation of the stimulus. In the present study, a new real-time subjective assessment system is developed. The system is composed of two parts: the sensibility input part and the sensibility evaluation part. The sensibility input part gets the values, which are recorded on the input board using pen-mouse, from the evaluation of each subject on his/her own subjective sensibility for the stimulus. The sensibility evaluation part displays the level of the pleasantness and arousal on one and two dimension in real time. An experiment on the design of the input board that any subject can easily and exactly evaluates one's own sensibility is also included in this study. The system can be used for evaluating the human subjective sensibility in real time, and, also, can be applied to other subjective assessment tests that require real time evaluation.
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.
전략 테이블과 유전 알고리즘을 이용한 LZ77 알고리즘의 성능 개선
정순철(Soonchul Jung),서동일(Dong-Il Seo),문병로(Byung-Ro Moon) 한국정보과학회 2004 정보과학회논문지 : 소프트웨어 및 응용 Vol.31 No.12
저장 공간이나 전송 시간을 줄여서 비용을 아끼는 데이타 압축 기술은 그 유용성 때문에 오래전부터 연구되어 왔다. Lempel-Ziv 77(LZ77) 알고리즘은 실용적인 사전-기반 비손실 압축 알고리즘이다. 기존의 LZ77 알고리즘에서 알고리즘의 성능에 큰 영향을 미치는, 사전의 크기는 고정되어 있다. 본 논문에서는 사전의 크기를 동적으로 바꾸면서 압축을 하는 동적 LZ77 알고리즘과 동적 LZ77 알고리즘에서 사용하는 전략을 진화시키는 유전 알고리즘을 소개한다. 유전 알고리즘으로 진화시킨 전략을 가지고 동적 LZ77 알고리즘은 기존의 LZ77 알고리즘보다 최대 약 16%까지 더 좋은 압축 효율을 보여 주었다. Data compression techniques have been studied for decades because they saved space and time to reduce costs. The Lempel-Ziv 77 (LZ77) is a dictionary-based, lossless compression algorithm. The dictionary size of the LZ77 algorithm is fixed, and the performance of the algorithm is highly dependent on its dictionary size. In this paper, we suggest a dynamic LZ77 algorithm that changes its dictionary size during compression, and also we suggest a genetic algorithm to evolve the dictionary-resizing strategies. The suggested algorithm outperformed the original version up to about 16%.