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교류전기장이 인가된 전선을 통해 전파하는 화염에 있어서 기울어진 각도가 미치는 영향에 대한 실험적 연구
임승재(Seungjae Lim),김민국(Minkuk Kim),박정(Jeong Park),권오붕(OhBoong Kwon),정석호(Sukho Chung),Osamu Fujita 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
An experimental study on downwardly and upwardly spreading flames over slanted electrical wire, which is insulated by Polyethylene(PE), was conducted with applied AC electric field. The result showed that downwardly and upwardly spreading flames with angle of inclination leaned toward burnt side and unburned side, respectively. With applied AC electric fields, size of downwardly spreading flame decreased slightly and that of upwardly spreading flame increased significantly. Flame spread rate showed various trends in terms of inclination, applied voltage and frequency.
임승재(Lim, Seung-Jae),김기웅(Kim, Ki-Woong) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4
This study investigates the influence of service quality on flow by employing the concept of recall intention and provides basic data for come up with life long sports targeting toward golf course guest consumer. A survey was gievn out to people who was department of golf students in 3 different ranges, located in Gyeonggi area. Total 250 questionnaires were used as final validity sample. For data analysis, SPSS 21.0 and Amos 20.0 were used for frequency analysis, reliability analysis, correlation analysis, confirmatory analysis and structural equating model. Results are as follow: First, service quality influenced positively on flow. Second, flow influenced positively on recall intention. Third, service quality positively influenced on recall intention. Providing discriminatory and high services to establish effective marketing strategies in golf course management will make golf course visitors more immersed, which will lead to revisit and help revitalize golf courses.
폴리에틸렌으로 피복된 기울어진 전선을 통한 화염전파에 대한 실험적 연구
임승재(Seungjae Lim),박정(Jeong Park),김민국(Minkuk Kim),정석호(Sukho Chung),Fusita Osamu 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
The Experimental study on flame spread over Polyethylene insulated slanted electrical wire was conducted with applied AC electric field. The results showed that flame slanted toward burnt side with AC electric field and slanted angle. The flame spread rate decreased with AC electric field, decreased initially with slanted angle and increased for high slanted angle. Flame extinction was characterized by applied voltage and frequency. Variation of spread rate could be explained by thermal balance mechanism.
목표지향적 행동모형과 여가제약-협상 모형을 활용한 프로배구 관람객의 의사결정과정
임승재(Lim, Seung-Jae) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4
The purpose of this study is to verify the decision-making process of professional volleyball spectators using a goal-oriented behavior model and a leisure constraint-negotiation model, and to provide empirical basic data for efficient strategy establishment. First, it was found that attitude, positive anticipation, negative anticipation, and perceived behavioral control had a positive effect on aspiration, and subjective norms did not. Second, aspiration positively influenced behavioral intention. Third, perceived behavior controllability had no influence on behavioral intention. Fourth, intrinsic constraints, a sub-factor of leisure constraints, were found to have an effect on negotiation, and interpersonal constraints and structural constraints did not.Fifth, it was found that the aspiration of the goal-oriented behavior model had a significant effect on the negotiation. Sixth, it was found that negotiation did not affect the intention of action. Therefore, it is expected that the results of this study will be the basic data for the decision-making of professional volleyball visitors.
차량 안정화 도달시간을 이용한 최적의 제어권 전환 요청 시간 결정
임승재(Seung Jae Lim),명노해(Rohae Myung) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: The aim of this study is to show that by calculating the optimal take-over request lead time (TORlt) using the stabilization time, the stabilization time could be fully utilized in research on take-over and reflect the personal driving tendency that variables in the previous study could not perform. Background: In conditional automated driving, the driver is placed in an out-of-the-loop situation. In order to overcome this problem, it is necessary to take-over request, but there is no official definition of optimal TORlt. In previous studies, they suggested various optimal TORlts, but there is the common limitation that they did not reflect personal driving tendencies. The tendency of personal driving is well observed in longitudinal/lateral control during manual driving, and it is necessary to analyze the stabilization after take-over to see if the driving performance has reached the manual driving level. Method: A total of 46 subjects participated in the study. This study described a take-over situation due to the sudden appearance of obstacles during automated driving using an OpenDS simulator. After the take-over, the driver performed manual driving until it was determined that the vehicle had stabilized on its own. The driving performance related to vehicle stabilization was measured as the standard deviation of speed and steering wheel angle (SWA). Using these, individual stabilization standards and the stabilization time were measured. Four TORlts (3s, 7s, 10s, 15s) were used as independent variables, and one-factor within-subject ANOVA analysis and Fisher"s LSD post-hoc analysis were performed using longitudinal/lateral stabilization time and Dual stabilization time as dependent variables. Results: In lateral stabilization and dual stabilization, there was a significant difference in stabilization time according to the change in TORlts, which was classified into two groups: 3s and more than 7s. And the stabilization time decreased as TORlt increased from 3s to 10s. But when TORlt increased from 10s to 15s, the stabilization time increased again, which was in a U-shape. Conclusion: The optimal TORlt calculated using the stabilization time reflecting individual stabilization standards is about 10 seconds, which is similar to previous studies. Application: This means that the stabilization time can sufficiently replace the role of variables used in the previous take-over studies. In addition, since individual stabilization standards were applied and analyzed, there is a sufficient advantage in that it can reflect personal driving tendencies.
교류 전기장이 인가된 폴리에틸렌으로 피복된 기울어진 상태의 전선을 통해 전파하는 화염에 대한 실험적 연구
임승재(Seungjae Lim),박정(Jeong Park),김민국(Minkuk Kim),정석호(Sukho Chung),Fujita Osamu 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
A experimental study on spreading flame over slanted polyethylene insulated electrical wire with AC electric field was conducted. The results showed that flame leaned relatively toward burnt side and flame spread rate decreased with applied voltage and frequency. The flame spread rate could be characterized by logarithmically scaled frequency with applied voltage at each slanted angle. Without electric field, flame spread rate decreased up to 80˚, and then increased up to 90˚. Flame extinction voltage was characterized with logarithmically scaled frequency.