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Factors Affecting the Recovery of Pilots +Gz Tolerance
Myunghwan Park,Cheolkyu Jee,Cheonyoung Kim,Hyeonju Seol 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.5
Objective:This study was designed to identify factors affecting pilots" +Gz tolerance recovery from +Gz induced exhaustion. Background: +Gz tolerance of pilots has been considered as a crucial factor to fly the modern high performance fighter aircrafts. However, the factors affecting pilots" G-tolerance recovery from +Gz induced exhaustion have not been examined in the acceleration research community. Method: A centrifuge profile consisting of a high +Gz run for pilot"s exhaustion and a low +Gz run for pilot"s recovery and another high +Gz runs for pilot"s second exhaustion was designed. The subjects" +Gz tolerance recovery ratio was measured by ratio of second high +Gz run time to the first high +Gz run time. The subjects" +Gz tolerance recovery rate was measured by dividing the subjects" +Gz tolerance recovery ratio by the low +Gz run time. The subjects" G-tolerance recovery rate was analyzed with respect to the subjects" personal factors including subjects" anthropometric and physiologic characteristics, flight time, flying aircraft type and so on. Results: The subjects" previous three-month flight hours (r =-0.336, p =0.039), sixmonth flight hours (r =-0.403, p =0.012) and one-year flight hours (r =-0.329, p = 0.044) correlated with the subjects" G-tolerance recovery rate. Conclusion: The subjects" G-tolerance recovery rate is clearly related to the subjects" previous flight hours. However, the subjects" anthropometric and physiologic characteristics do not show any statistically significant correlation with the subjects" G-tolerance recovery rate. Application: This research provides a safety critical insight to aviation community by identifying the factors to affect the gravity-induced loss of consciousness (GLOC) of pilots.
Jinju Kim,Youngcheon Lim,Hyeonju Seol,Cheolkyu Jee,Youngseok Hong 대한인간공학회 2014 大韓人間工學會誌 Vol.33 No.3
Objective: This study aims to examine the psychological effects of pilots caused by the environmental differences between actual and simulated flights by measuring biochemical stress level and subjective stress level. Background: Currently, the flight system of the air force suffers from several problems including a limited training area, increase of complex and tangled missions and rise in oil prices. In order to overcome these problems an L-V-C (Live, Virtual, Constructive) training system has been proposed as a solution. However, to establish the effective L-V-C training system, it is required to figure out the characteristics of each system first. Also we have to solve the problems which could occur when these systems are connected together. Method: In order to measure the biochemical stress level of pilots, we investigated the differences in cortisol responses after actual and simulated flight training separately. Meanwhile, we conducted the questionnaire survey of about 40 pilots to identify the subjective stress level of pilots. Results: There was significant difference in cortisol level between actual and simulated flight tasks. However, we found that there was no significant difference in pilots" feelings about two flight tasks. Conclusion: The results from this study can be used as basis for the further research on not only how to decrease linkage errors of the L system and the V system but also how to make the L-V training system more practical. Application: The results of the analysis might help to develop the Live-Virtual-Constructive (LVC) pilot training system.
혼합 시퀀스 커널을 이용한 조종사의 비동적 행위 모델링
최예림,전승욱,지철규,박종헌,신동민,Choi, Yerim,Jeon, Sungwook,Jee, Cheolkyu,Park, Jonghun,Shin, Dongmin 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.6
For decades, modeling of pilots has been intensively studied due to its advantages in reducing costs for training and enhancing safety of pilots. In particular, research for modeling of pilots' non-kinetic behaviors which refer to the decisions made by pilots is beneficial as the expertise of pilots can be inherent in the models. With the recent growth in the amount of combat logs accumulated, employing statistical learning methods for the modeling becomes possible. However, the combat logs consist of heterogeneous data that are not only continuous or discrete but also sequence independent or dependent, making it difficult to directly applying the learning methods without modifications. Therefore, in this paper, we present a kernel function named hybrid sequence kernel which addresses the problem by using multiple kernel learning methods. Based on the empirical experiments by using combat logs obtained from a simulator, the proposed kernel showed satisfactory results.
Kim, O-Jong,Yu, Sunkyoung,No, Heekwon,Kee, Changdon,Choi, Minwoo,Seok, Hyojeong,Yoon, Donghwan,Park, Byungwoon,Jee, Cheolkyu The Korean Society for Aeronautical and Space Scie 2017 International Journal of Aeronautical and Space Sc Vol.18 No.3
Among various applications of the High Altitude Long Endurance (HALE) Unmanned Aerial Vehicle (UAV), this paper has a focus on the Global Positioning System (GPS) utilizing pseudolite and its improved performance, particularly during the multi-purpose missions. In a multi-purpose mission, the HALE UAV follows a specified flight trajectory for both navigation applications and missions. Some of the representative HALE missions are remote exploration, surveillance, reconnaissance, and communication relay. During these operations, the HALE UAV can also be an additional positioning signal source as it broadcast signals using pseudolite. The pseudolite signal can improve the availability, accuracy, and reliability of the GPS particularly in areas with poor signal reception, such as shadowed regions between tall buildings. The improvement in performance of navigation is validated through simulations of multi-purpose missions of the solar-powered HALE UAV in an urban canyon. The simulation includes UAV trajectory generation at stratosphere and uses actual geographical building data. The results indicate that the pseudolite-equipped HALE UAV has the potential to enhance the performance of the satellite navigation system in navigationally degraded regions even during multi-purpose operations.
O-Jong Kim,Sunkyoung Yu,Heekwon No,Changdon Kee,Minwoo Choi,Hyojeong Seok,Donghwan Yoon,Byungwoon Park,Cheolkyu Jee 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.3
Among various applications of the High Altitude Long Endurance (HALE) Unmanned Aerial Vehicle (UAV), this paper has a focus on the Global Positioning System (GPS) utilizing pseudolite and its improved performance, particularly during the multi-purpose missions. In a multi-purpose mission, the HALE UAV follows a specified flight trajectory for both navigation applications and missions. Some of the representative HALE missions are remote exploration, surveillance, reconnaissance, and communication relay. During these operations, the HALE UAV can also be an additional positioning signal source as it broadcast signals using pseudolite. The pseudolite signal can improve the availability, accuracy, and reliability of the GPS particularly in areas with poor signal reception, such as shadowed regions between tall buildings. The improvement in performance of navigation is validated through simulations of multi-purpose missions of the solar-powered HALE UAV in an urban canyon. The simulation includes UAV trajectory generation at stratosphere and uses actual geographical building data. The results indicate that the pseudolite-equipped HALE UAV has the potential to enhance the performance of the satellite navigation system in navigationally degraded regions even during multi-purpose operations.