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( Hyungseok-jo ),( Kyubeom-kim ),( Seokhuen-ahn ),( Namhun-her ),( Sanghyeok-seo ),( Youngjung-kim ),( Byungchan-min ) 한국감성과학회 2019 한국감성과학회 국제학술대회(ICES) Vol.2019 No.-
The purpose of this study was to observe the correlation between illuminance and the color temperature that is suitable for the learning environment through the EEG. According to the characteristics of the color temperature it was divided into 3000K, 4000K, 6500K. The illuminance was set at 400lx and 1000lx as the KS standards. UK test was performed in each lighting situation. During the experiment, EEG were measured to see the central nervous system response. The experiment included 12 male that experienced learning in the classroom and reading room. The EEG were sampled at 512Hz using a TAOS VITALBRAIN, and the detected raw data were filtered through a 60Hz noise filter. After filtering, frequency analysis was performed. And power spectrum analysis was performed for αwave and βwave. We analyzed differences in the EEG based on the different lighting by 2-way ANOVA and post-hoc tests. The results of the study showed that a significant difference exists in terms of the EEG based on the illuminance and color temperature(p<0.05). Regarding the alpha power, 3000K-1000lx was higher than other lighting.
조성일(Seongil Jo),허형석(Hyungseok Heo),배석정(Sukjung Bae) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A waste heat recovery system with Rankine steam cycle for improvement of performance of a gasoline vehicle has been established. Rankine steam cycle consists of the 4 processes: adiabatic compression, waste heat recovery, power generation and condensation. In this study, research was carried out to improve the performance of the shell and tube type super-heater. Design parameters are as follows: the location of the inlet and the outlet port for coolant side, the arrangement of tubes and the number of tubes, the interval between baffles and the number of baffles. In conclusion, the heat transfer performance increased by 21% and pressure drop of exhaust gas decreased by 28.3%.
The Effect of Color Temperature Changes on Bio-signals in Autonomous Vehicle Environment
( Kyubeom-kim ),( Hyungseok-jo ),( Seokhuen-ahn ),( Namhun-her ),( Sanghyeok-seo ),( Byungchan-min ) 한국감성과학회 2019 한국감성과학회 국제학술대회(ICES) Vol.2019 No.-
The creation of a stable indoor atmosphere of a vehicle is suggested as a solution for the receptivity problem. A pleasant environment is to be provided to drivers using lighting as a tool for it. The illuminance level of 10 1x(Lux) was presented based on night driving. As for color temperature, 3000K, 4000K, 5000K, and 6000K were presented at regular intervals. As a result of variance analysis by band for each color temperature, there was no difference in βPower, however, in the case of αPower, there was a statistically significant difference at the significance level of 5%(p<0.05). However, if the trend of data was examined, it can be certified that the activity of sympathetic nervous system was low at low color temperature(3000K, 4000K) and high at high color temperature(5000K, 6000K).
조성일(Seongil Jo),허형석(Hyungseok Heo),배석정(Sukjung Bae),서형준(Hyeongjun Seo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
An investigation for application of an EGR (exhaust gas recirculation) system to gasoline engine has been conducted. While diesel engines are demanded for an EGR system to obtain denser compressed EGR gas and mostly in order to de-NOx the exhaust gas, gasoline EGR systems are furnished to improve fuel economy by reduction of pumping loss and knocking. An EGR system consists of an EGR valve, an EGR cooler, and pipes. In this paper, an EGR cooler for gasoline engine has been designed to satisfy performance factors via CFD analysis. In order to obtain enhanced heat transfer performance, offset strip fins are used inside the EGR gas tubes. Parametric studies have been conducted to examine the effects on the performance of the EGR cooler for several selected principal parameters. The parameters for the offset fin such as fin pitch and slit width were investigated to settle the offset fin geometries. The effects of geometries of exhaust gas inlet divergent and outlet convergent diffusers, and the coolant side flow channel were investigated.
엔진 폐열 회수 시스템 저온 응축기의 성능 향상을 위한 해석적 접근
배석정(Sukjung Bae),허형석(Hyungseok Heo),조성일(Seongil Jo),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The optimum design of the low-temperature condenser of a dual-loop waste heat recovery system with Rankine steam cycles for improving the fuel efficiency of gasoline automobiles has been investigated. The waste heat recovery system consists of a high-temperature (HT) loop in which water as the HT working fluid recovers waste heat only from the exhaust gas of about 700℃ and a low-temperature (LT) loop in which a refrigerant as the LT working fluid recovers heat dissipation from the HT loop, and waste heat from the engine coolant of relatively low temperature. The low temperature condenser plays a role to dissipate heat from the system by condensing the low temperature loop working fluid sufficiently. However, the refrigerant has low evaporation temperature enough to recover the waste from engine coolant but has small saturation enthalpy so that excessive mass flow rate of the LT working fluid, e.g., over 150 g/s, causes the enormously large pressure drop of the working fluid to maintain the heat dissipation performance of more than 20 kW. This paper has dealt with the scheme to design the low temperature condenser that has reduced pressure drop while ensuring the required thermal performance from the waste heat recovery system. For the purpose of the performance predictions and the parametric study for the LT condenser, we have developed a 1-dimensional user-friendly performance prediction program that calculates feasibly the phase change of the working fluid in the tubes. Sustaining the scale of the existing vehicle refrigerant condenser, the number of pass, arrangement of the tubes of each pass and the structural design to enhance the flow uniformity through all the tubes of the multi-flow type low temperature condenser were analytically investigated.
송치영(chiyung Song),조형석(Hyungseok Jo),서상혁(sanghyuk Seo),민병찬(Byung chan Min) 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.5
현대사회의 대표적 교통수단인 지하철을 이용할 때마다 지하철 이용객은 각종 부착물에 대한 내외적인 요인에 의하여 육체적 정신적 저항에 항시 노출된다. 이용자 만족도를 높이기 위하여 교통정책 개선 등이 이루어지고 있으나 실효성이 적다. 그렇기에 제고를 위해서는 이용자가 느끼는 부정적 느낌을 적게 받게 하거나 줄이는 것이 중요한 과제라고 할 수 있을 것이다. 따라서 본 연구에서는 지하철 이용객에게 부정적 이미지가 전달되고 어떻게 인식되는지를 알아보고 청각자극을 제시해 부정적 이미지에 대한 회피 및 마스킹 효과가 있는지를 규명하고자 하였다. 위와 같은 목적을 이루기 위해 정성적 평가인 일대 비교법을 사용하였고 IAPS의 부정적 이미지만을 제시한 경우와 청각자극을 동시에 제시한 경우를 일대일로 비교하여 7점 척도 평가를 진행하였다. 연구결과 혐오감에 대한 대조군과 실험군의 각 자극간의 높은 유의차(P<0.01)가 발생하였지만, 순위는 변동이 없었으며, 심리척도도 크게 변화하지 않았다. 청각이 시각보다 인지 반응이 빠르더라도 자극적이고 강렬한 시각 자극이 발생하게 되면 그 자극을 상쇄시키지 못한다는 것을 알 수 있었다. 금후 인체의 정량적 평가를 위해 객관적 지표로서 심전도나 뇌파를 이용하여 측정 및 평가를 할 예정이다. Whenever the subway, the representative means of transportation in modern society, is used, the subway users are always exposed to the physical, mental resistance by the internal and external factors of various attachments. The improvement of traffic policy is made to enhance the satisfaction of users, but is less effective. Therefore, it is an important task to make the users feel less negative feeling or to reduce it for enhancement. Thus, this study was aimed to examine how the negative image is transferred to the subway users and how it is recognized by them, and to specify whether there is avoidance and masking effect on the negative image by presenting the auditory stimuli. In order to achieve the above purpose, method of paired comparison, the qualitative assessment, was used, one-to-one comparison was made between the case where only the negative image of IAPS was presented and the case where the auditory stimuli were presented at the same time, and then 7-point scale evaluation was conducted. As a result of research, there was a high significant difference(P<0.01) between each stimulus of the control group and the experimental group on disgust, and the ranking remained unchanged, and the psychological scale did not change significantly. Even if the auditory sense is faster in cognitive response than the visual sense, it could be seen that a stimulating, intensive visual stimuli didn’t offset the stimuli. In the future, the evaluation by electrocardiogram or brain wave measurement will be conducted as an objective indicator for quantitative evaluation of human body.
Effect of Light Change on the Autonomic Nervous System in the Education Environment
( Chungkyo-in ),( Kyubeom-kim ),( Hyungseok-jo ),( Hogyum-kim ),( Seunghyun-kwak ),( Sangheok-seo ),( Byungchan-min ) 한국감성과학회 2019 한국감성과학회 국제학술대회(ICES) Vol.2019 No.-
The purpose of this study was to observe the illuminance and the color temperature that is suitable for the educational environment through the ECG. According to the characteristics of the color temperature it was divided into 3000K, 4000K, 6500K. The illuminance was set at 400lx and 1000lx as the KS standards. U-K test was performed in each lighting situation. During the experiment, ECG were measured to see the autonomic nervous system response. The experiment included 12 male that experienced learning in the classroom and reading room. The ECG were sampled at 1000Hz using a BIOPAC MP30, and the detected raw data were filtered through a band-pass filter. The values of the LF and HF bands were derived from the frequency analysis. Then, the activity of the sympathetic nervous system was calculated through the ratio of LF and HF. Calculated data were processed by the normalization formula. We analyzed differences in the ECG based on the different lighting by 2-way ANOVA and post-hoc tests. The results of the study showed that a significant difference exists in terms of the ECG based on the illuminance and color temperature(p<0.05). Regarding the ECG, Sympathetic nervous system activity was higher at 3000K-1000lx than at 3000K-400lx.