• Journal of Mechanical Science and Technology
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• 제16권3호
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• pp.327-337
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• 2002

This paper applies a recently developed on-line parameter identification (PID) technique to sets of real flight data and compares the results with those of a state-of-the-art off-line PID technique. The on-line PID technique takes Linear Regression from Fourier Transformed equations and the off-line PID is based on the traditional Maximum Likelihood method. Sets of flight data from the NASA F/A-18 High Alpha research Vehicle (HARV) circraft, which has been recorded from specifically designed maneuvers and used for our line parameter estimation, are used for this study. The emphasis is given on the accuracy and on-line measure of reliability of the estimates. The comparison is performed for both longitudinal and lateral-directional dynamics for maneuvers at angles of attack ranging u=20°through $\alpha$=40°. Results of the two estimation processes are also compared with baseline wind tunnel estimates whenever possible.

• Bulletin of the Korean Chemical Society
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• 제26권2호
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• pp.303-308
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• 2005

A miniaturized time-of-flight mass spectrometer with an electron impact ionization source and sheet membrane introduction has been developed. The advantages and features of this mass spectrometer include high sensitivity, simple structure, low cost, compact volume with field portability, and ease of operation. A mass resolution of 400 at m/z 78 has been obtained with a 25 cm flight path length. Under optimized conditions, the detection limits for the volatile organic compounds (VOCs) studied were 0.2-10 ppm by volume with linear dynamic ranges greater than three orders of magnitude. The response times for various VOCs using a silicone membrane of 127 $\mu$m thickness were in the range 4.5-20 s, which provides a sample analysis time of less than 1 minute. These results indicate that the membrane introduction/time-of-flight mass spectrometer will be useful for a wide range of field applications, particularly for environmental monitoring.

• 한국항공운항학회지
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• 제23권4호
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• pp.22-29
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• 2015

Quadrotor is widely used in variable application nowadays. Due to its inherent unstable characteristics, control system to augment the stability is essential for quadrotor operation. To design control system and verify its performance through simulation, accurate dynamic model is required. Quadrotor dynamic model is simply compared with conventional rotorcraft such as helicopter. However, the accurate dynamic model of quadrotor is not easy to develop because of the highly correlated aerodynamic effect of each rotor. In this paper, quadrotor dynamic model is identified from the flight data using frequency domain approach. Flight test of quadrotor is performed in closed loop configuration with stability augmentation system included. Frequency sweep input is applied in each of lateral, longitudinal, yaw and heave axis separately. The bare dynamic model is identified from the flight data of quadrotor responses and thrust measurement through Pulse Width Modulation(PWM) data. The frequency responses of identified model match well with those of flight data, and time responses of identified model for doublet input in each axis are also shown to agree with flight data.

• 한국멀티미디어학회논문지
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• 제24권10호
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• pp.1346-1357
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• 2021

The drone technology, which is receiving a lot of attention due to the 4th industrial revolution, requires an Unmanned Aerial Vehicles'(UAVs) flight path search algorithm for automatic operation and driver assistance. Various studies related to flight path prediction and recommendation algorithms are being actively conducted, and many studies using the A-Star algorithm are typically performed. In this paper, we propose an Optimal 3D Flight Path Recommendation System for unmanned aerial vehicles. The proposed system was implemented and simulated in Unity 3D, and by indicating the meaning of the route using three different colors, such as planned route, the recommended route, and the current route were compared each other. And obstacle response experiments were conducted to cope with bad weather. It is expected that the proposed system will provide an improved user experience compared to the existing system through accurate and real-time adaptive path prediction in a 3D mixed reality environment.

• 한국군사과학기술학회지
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• 제22권4호
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• pp.536-544
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• 2019

During the assembly and function inspection of missile system, flight simulation process is required. In the conventional flight simulation check of missiles, an inertial navigation system simulator was used to transmit the navigation output data acquired in HILS. There are several disadvantages in terms of check configuration complexity and data synchronization when using the simulator. So we proposed a new flight simulation method that utilizes the nonvolatile built-in memory of the aviation control unit. The data processing procedure and operation procedure of the proposed method for type I and type II missiles are presented. And we analyzed the causes of the difference between proposed method result and the HILS result for type II missile. By comparing the results obtained by the experiments using the proposed method with the results of HILS, the validity of proposed method was confirmed.

• 항공우주정책ㆍ법학회지
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• 제33권1호
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• pp.45-79
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• 2018

항공기나 군용기의 운용이 폭발적으로 증가함에 따라, 공항이나 비행장 인근 주민들이 항공기 운항으로 인한 소음 진동 등을 이유로 손해배상을 청구하거나 비행을 금지하는 경우가 점차 늘어나고 있다. 최근에는 원고는 토지의 소유권에 터 잡아 피고를 상대로 토지의 상공을 헬기의 이 착륙 항로로 사용하는 행위의 금지를 구하는 소를 제기하였고, 대전고등법원에서 청구를 인용한 사례가 있다. 비록 위 판결은 대법원에서 파기되었지만, 비행금지청구에 관한 논의가 필요하다. 일본에서는 공항소음소송이 환경단체를 중심으로 오래 전부터 제기되어 왔는데, 소음피해로 인한 손해배상을 인정하는 경우와 달리 비행금지청구를 인용한 판결은 2014. 5. 21. 요코하마 지방재판소에서 처음 선고되었다. 위 판결은 항소심에서 일부 변경되어 원고의 청구가 일부 인용되었으나. 최고재판소에서 파기 환송되었다. 아쓰기(厚木) 기지는 미국과 일본이 공동으로 사용하는 기지인데, 인근주민들은 아쓰기 기지에 이착륙하는 항공기에서 발생하는 소음에 의해 신체적 피해 및 수면방해, 생활방해 등의 정신적 피해를 받고 있다고 주장하면서, 방위청장관이 소속되어 있는 국가에 대하여 자위대기 및 미군기의 운항금지 등을 요구하는 행정소송을 요코하마 지방재판소에 제기하였다. 제1심은 "부득이하다고 인정하는 경우를 제외하고"라는 제한을 부과하여 매일 오후 10시부터 다음날 오전 6시까지 자위대기의 비행을 금지하는 판결을 선고하였고, 위와 같은 결론은 항소심에서도 유지되었다. 그러나 최고재판소는 자위대기의 비행금지청구를 인용한 원심판결을 파기하고, 그 부분에 해당하는 제1심 판결을 취소하였으며, 원고들의 청구를 기각하였다. 최고재판소는 자위대기의 운항은 고도의 공공성이 인정되고, 소음피해는 경시할 수 없으나 상응하는 대책을 강구할 수 있으므로, 방위청장관의 권한행사는 타당하다고 판시하였다. 우리나라에서도 군용기지 인근주민들이 미국이나 대한민국 또는 국방부장관을 상대로 군용기 비행금지를 구하는 소를 제기할 수 있다. 만약 군용기지 부근의 주민들이 미국정부를 상대로 미군기 비행금지를 청구하는 소를 제기하면, 법원은 재판권면제를 이유로 소장각하명령을 하여야 한다. 현행 판례 법리에 따르면, 국방부장관을 상대로 군용기의 비행금지를 청구하는 의무이행소송이나 무명항고소송은 허용되지 아니하므로, 그러한 소는 부적법하다. 다만, 행정소송법이 개정되어 의무이행소송이 도입된다면 소제기는 적법하게 될 수 있다. 군용기 운항에 관한 행정처분이 위법하다고 판단하기 위해서는 청구가 허용될 경우 인근주민이 받을 이익과 상대방 및 제3자가 받게 될 불이익 등을 비교 형량해 보아야 한다. 국방부장관으로서는 군용기의 운항으로 인한 이익(초계임무나 대잠활동 등 국방상 필요, 항공정보의 획득 제공, 재해파견 등 민생협력 활동, 해적대처 등 국제공헌, 교육 훈련 등)이 인근주민이 군용기 비행금지로 인하여 얻는 이익보다 훨씬 크다는 점을 주장 증명할 필요가 있다.

• 한국자동차공학회논문집
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• 제3권1호
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• pp.108-117
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• 1995

The primary purpose of this extensive test effort was to observe real-time operational performance characteristics associated with automotive grade fuel utilized by piston engine powered light aviation aircraft. In fulfillment of this effort, baseline engine operations were established with 100LL aviation grade fuel followed by four blends of automotive grade fuel. A comprehensive sea-level-static test cell/flight test data collection and evaluation effort were conducted to review operational characteristics of a carbureted light aircraft piston engine as related to fuel volatility, fuel temperature, and fuel system pressure. Presented herein are results, data, and conclusions drawn from test cell engine operation as well as flight test operation on 100LL aviation grade and four blends of automotive grade fuel.

• 한국항공운항학회지
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• 제22권2호
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• pp.53-59
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• 2014

Simultaneous parallel approaches in all weather conditions should be applied to manage efficiently increasing volume of air traffic flow and solve the problem of delayed arrivals. But All of the airports which have closely-spaced parallel-runways in Korea don't meet the interval-standards for IFR parallel approaches. In that regard, more accurate and safer System should be applied for the Korean airports. GNSS was adopted as an international standard of the next-generation navigation system and many studies and master plans have been activated by stages in Korea. In this paper, the current state of the domestic airports will be analyzed focusing on the interval of parallel runways and future specification of both flight operation system and air-side management will be recommended.

• Journal of the Korean Data and Information Science Society
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• 제26권6호
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• pp.1495-1500
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• 2015

We obtain means and variances of max {X, Y} and min {X, Y} in the underlying Morgenstern type bivariate uniform variables X and Y with same scale parameters and different scale parameters respectively. And we obtain the conditional expectations in the underlying Morgenstern type bivariate uniform variables. Here, we shall consider the conditional expectations to know the dependence of one variable on the other variable and we consider the behaviors of means and variances of max {X, Y} and min {X, Y} with respect to changes in means, variances, and the correlation coeffcient of the underlying Morgenstern type bivariate uniform variables.

• 한국항공운항학회지
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• 제13권3호
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• pp.1-8
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• 2005

The purpose of this study was to identify the relationship between personality type and GPA scores of the student majoring flight operation. The data were collected from 96 "H' University student. MBTI Test was selected and used to analyze student's personality type. The results from MBTI Test and GPA scores were analyze by SPSS 10.0 package. I found that E, S, T, J Type, SJ, ST Type, ESTJ, ISTJ Type student are dominated. There were no significant relationship between personality type and GPA scores. The effective teaching strategies have to be considered for each personality type for better education.