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Virtual Reality Head Mounted Display 기반 공군 조종사 모의비행 훈련 시뮬레이터 운용효과에 관한 연구
박영도(Young Do Park),마정목(Jungmok Ma) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.2
Objective: The purpose of this study is to compare Visual Monitor (VM)-based and Virtual Reality Head Mounted Display (VR HMD)-based simulated flight training simulators in terms of flight training effects, user experience effects. Background: VR HMD-based simulators can increase immersion and realism by providing more realistic virtual environments in comparison to VM-based simulators. Existing studies related to VR HMD-based simulators have been mainly focused on flight training effects of pilots rather than all the effects collectively. Method: This study conducted a comparative experiment of VM-based and VR HMD-based simulators with 25 Republic of Korea Air Force F-15K fighter pilots. The survey measured 20 detailed evaluation items related to flight training effects and user experience effects using a 7-point scale for the two simulators. Results: 5 out of 10 items on flight training effects, 8 out of 10 items on user experience effects were statistically significantly higher in VR HMD-based simulators than in VM-based simulators. Conclusion: When VR HMD-based simulators are used to the flight training for Air Force pilots, practical operational effects can be improved in terms of flight training effects, user experience effects. Application: The results of this study are expected to help us understand the system characteristics of VR HMD-based simulators.
황종빈(Jongbin Hwang),박정목(Jungmok Park),송진석(Jinseok Song),김주하(Jooha Kim) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
In the present study, wind tunnel experiments were performed to reduce the drag of a paragliding helmet in the range of Reynolds numbers from 46,000 to 155,000. The drag force of the helmet model with dimples and deflectors installed was measured by varying the dimple depth and the slant angle of the deflector. The dimples were effective in reducing the drag at low Reynolds numbers, but no significant drag reduction was found in the Reynolds number range in which an actual paraglider flight takes place. On the other hand, the deflector installed tangentially to the side outline of the helmet showed an average drag reduction of 7% in the flight Reynolds number range of real paragliding. This was because the deflector shrunk the size of the wake region and moved the wake region downstream of the deflector.
신정한(Jeonghan Shin),채석봉(Seokbong Chae),신이수(Yisu Shin),박정목(Jungmok Park),송진석(Ginseok Song),김주하(Jooha Kim) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
In the present study, we investigate the flow characteristics of a paraglider canopy with leading-edge tubercles by performing force measurement and surface flow visualizations. The experiment is conducted at Re = 3.3×10<SUP>5</SUP> in a wind tunnel, where Re is the Reynolds number based on the mean chord length and the free-stream velocity. The canopy model with leading-edge tubercles has flow characteristics of a two-step stall, showing an earlier onset of the first stall than the canopy model without leading-edge tubercles. However, the main stall angle of the tubercled model is much larger than that of the canopy model without tubercles, resulting in a higher aerodynamic performance at high angles of attack. The delay in the main stall is ascribed to the suppression of separation bubble collapse around the wingtip at high angles of attack.