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이용태(YongTae Lee),김민호(MinHo Kim),정재동(JaeDong Chung),김선태(SeonTae Kim),김태헌(Taehun Kim) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
The latent heat thermal storage system has been widely adopted to air conditioning for cooling and heating due to the high thermal storage density. However, most type of its application were designed to deal with only either the cooling or heating load. To overcome this drawback, this study considers the thermal storage tank with combined cooling and heating PCM for both operation. Five ratio, from 100% cooling PCM to 100% heating PCM with reducing 25% of cooling PCM, were investigated to estimate the cooling performance. The cooling mode is divided into the charging and discharging process. The performance of each process is evaluated by using the definition of thermal storage density, which is the ratio of storage energy versus tank volume. The maximum thermal storage density was found about 35kwh/m³ and 18.5kwh/m³ at discharging and charging process respectively, whereas the minimum values were approximately 14.5kwh/m³ and 9.5kwh/m³ at each process.
이용태(Yongtae Lee),김만호(Man Ho Kim),손준우(Joonwoo Son) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Driving is a complex psychomotor task often interrupted by secondary activities that increase cognitive workload and divert attention away from the roadway. The risk of inattentive driving is known to vary with age. To assess the impact of advancing age on driving performance under dual task condition, we evaluate the performance of 63 drivers divided into two age groups, younger (20-29) and older (60-69). This study considers driving behavior in the context of highway driving. Driving performance is composed the forward velocity, speed control and lateral control. Results indicate that age impacts both driving performance and compensatory behavior during dual load conditions.
이용태(Yongtae Lee),김만호(Man Ho Kim),손준우(Joonwoo Son) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.3
Driving is a complex psychomotor task often interrupted by secondary activities that increase cognitive workload and divert attention away from the roadway. The risk of inattentive driving is known to vary with age. To assess the characteristics of advancing age on driver's cognitive workload under dual task condition, we evaluate the performance of 96 drivers divided into three age groups: 20's, 40's, and 60's. This study considers driver's cognitive workload in the context of urban and highway driving. Error rate & Dual task cost are used to measure driver's cognitive workload. Results indicate that age impacts cognitive workload during dual task driving conditions.
이원섭(Wonsup Lee),박장운(Jangwoon Park),김수진(Sujin Kim),윤성혜(Sunghye Yoon),Xiaopeng Yang,이용태(Yongtae Lee),손준우(Joonwoo Son),김만호(Man Ho Kim),유희천(Heecheon You) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.1
An analysis of biosignal and performance data collected during driving has increasingly employed in research to explore a human-vehicle interface design for better safety and comfort. The present study developed a protocol and a system to effectively analyze biosignal and driving perfomlance measurements in various driving conditions. Electrocardiogram (ECG), respiration rate (RR), and skin conductance level (SCL) were selected for biosignal analysis in the study. A data processing and analysis protocol was established based on a comprehensive review of related literature. Then, the established analysis protocol was implemented to a computerized system so that immense data of biosignal and driving performance can be analyzed with ease, efficiency, and effectiveness for an individual and/or a group of individuals of interest. The developed analysis system would be of use to examine the effects of driving conditions to cognitive workload and driving performance.
Modeling, analysis and optimizing the power transmission mechanism for a new type of wind turbine
Hamid Bamshad,Yongtae Lee(이용태),Hyunseok Yang(양현석) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, a new wind turbine conceptual design is presented. The current common type of wind turbines are not really suitable to install and work in urban area. While, the new idea is trying to make more environment-friendly wind turbine in order to install and implement inside cities with more advantage over common types. Unlike the common type, this proposed wind turbine has reciprocating linear motion along the vertical axis. This motion is transferred to the electrical generator by using power transmission system. This paper mainly focuses on modeling, analysis and optimization of the power transmission system for the new proposed wind turbine. Based on the obtained model and simulation the designed parameters those play important role to the system output, are founded. Finally by using genetic algorithm optimization method, the designed parameters are optimized to make an appropriate system output to the electrical generator.
김만호(Man Ho Kim),이용태(Yongtae Lee),손준우(Joonwoo Son) 대한인간공학회 2009 대한인간공학회 학술대회논문집 Vol.2009 No.5
Recent technological advances made a vehicle more intelligent to increase safety and comfort. Advanced Driver Assistance Systems (ADAS) provide drivers with safety warning information through audible sounds, visual displays, and tactile devices. However, elderly drivers have been known to decrease the physical and cognitive ability such as muscular strength, hearing, eyesight, short term memory, and space perception. Therefore, possible age-related deficits should be considered to design an effective warning system. This paper aims to evaluate the impact of advancing age on response performance on vehicle safety warning alarms which are widely used for altering driving hazards. The frequency, period and intensity of warning sounds are considered to characterize the warning sounds. In order to analysis the response performance among age groups: younger (20-29), middle (40-49) and older (60-69), 38 drivers were asked to drive a simulated rural road in driving simulator. The results of the present study suggest that age-related deficits in the hearing could play a role in the response performance on vehicle safety warning.