• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.84-87
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• 2008

ATTOL is a software unit testing tool produced by the ATTOL Testware SA in France. It automates the entire software unit testing process: test plan template and test program generation, test program execution, test result analysis and test report generation. ATTOL is suited for the development of embedded software as it allows programmers to operate in native and cross development environments. Particularly, it is used for the development of the flight software which is embedded in the Communication Ocean Meteorological Satellite (COMS). As the flight software is mission-critical, it requires the strict software quality and high testing constraints. The flight software of COMS is verified by ATTOL in native and cross platforms. In 2002, ATTOL was taken over by the IDM Rational Software and has been supplied with the name of Test RealTime (TestRT). The test process of TestRT becomes different from that of ATTOL as TestRT provides the new functionalities that were absent from ATTOL. TestRT provides the new features in the test script language, as well. In this paper, we compare the test process of ATTOL to TestRT With an example of COMS and explain what has been changed in the test script language.

• 한국정보시스템학회지:정보시스템연구
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• 제31권3호
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• pp.177-195
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• 2022

Purpose This paper aims to prepare a full operational readiness by establishing an optimal flight plan considering the weather conditions in order to effectively perform the mission and operation of military aircraft. This paper suggests a flight prediction model and rules by analyzing the correlation between flight implementation and cancellation according to weather conditions by using big data collected from historical flight information of military aircraft supplied by Korean manufacturers and meteorological information from the Korea Meteorological Administration. In addition, by deriving flight rules according to weather information, it was possible to discover an efficient flight schedule establishment method in consideration of weather information. Design/methodology/approach This study is an analytic study using data mining techniques based on flight historical data of 44,558 flights of military aircraft accumulated by the Republic of Korea Air Force for a total of 36 months from January 2013 to December 2015 and meteorological information provided by the Korea Meteorological Administration. Four steps were taken to develop optimal flight prediction models and to derive rules for flight implementation and cancellation. First, a total of 10 independent variables and one dependent variable were used to develop the optimal model for flight implementation according to weather condition. Second, optimal flight prediction models were derived using algorithms such as logistics regression, Adaboost, KNN, Random forest and LightGBM, which are data mining techniques. Third, we collected the opinions of military aircraft pilots who have more than 25 years experience and evaluated importance level about independent variables using Python heatmap to develop flight implementation and cancellation rules according to weather conditions. Finally, the decision tree model was constructed, and the flight rules were derived to see how the weather conditions at each airport affect the implementation and cancellation of the flight. Findings Based on historical flight information of military aircraft and weather information of flight zone. We developed flight prediction model using data mining techniques. As a result of optimal flight prediction model development for each airbase, it was confirmed that the LightGBM algorithm had the best prediction rate in terms of recall rate. Each flight rules were checked according to the weather condition, and it was confirmed that precipitation, humidity, and the total cloud had a significant effect on flight cancellation. Whereas, the effect of visibility was found to be relatively insignificant. When a flight schedule was established, the rules will provide some insight to decide flight training more systematically and effectively.

• 항공우주시스템공학회지
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• 제17권2호
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• pp.38-44
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• 2023

본 연구는 5G 통신을 이용한 농업용 드론에 임무 카메라를 장착하여 농작물 상태 정보 획득을 위한 비행시험에 대해 다룬다. 시험 방법은 설정된 다분광카메라와 열화상카메라를 드론에 장착하고 운영 고도와 속도를 달리하여 농작물 상태 이미지를 획득하는 것이다. 다분광카메라는 다섯 가지의 분광 파장을 이용하여 농작물 상태 이미지를 획득하며 자체 내장된 GPS에서는 비행 중 획득한 이미지의 정확한 위치와 고도 정보를 비행시간과 동기화 하여 제공한다. 그리고 비행 중 획득된 열 영상 데이터는 분석을 위해 5G 통신으로 지상의 서버로 전송된다. 그러므로 분광카메라와 열영상카메라를 함께 이용할 경우 효율적인 경작지 상태 파악이 가능하며, 본 연구를 통해 농업용 드론에 임무 장비를 장착한 비행시험으로 경작지에서 농작물 상태 파악이 가능함을 증명하였다.

• 융합정보논문지
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• 제10권10호
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• pp.123-127
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• 2020

야간 중대형 산불의 전체적인 화선정보를 얻기 위하여 누락되는 산불에 대한 반복적인 임무비행과 임무수행 종료 후 획득되는 정사영상 정합에 대한 소요시간을 줄이기 위하여 실시간 동영상으로 산불발생 여부를 판단하고 드론의 위치와 영상카메라의 각도정보, 지도상의 고도정보를 활용하여 판단된 산불위치를 계산하여 지도에 도시할 수 있는 지상통제시스템을 개발하였다. 개발된 기능의 신뢰성을 검증하기 위하여 비행고도 별, 영상카메라의 지향하는 위치정보의 오차거리를 측정하였으며, 신뢰할 수 있는 범위내의 위치정보를 지도에 표시하였다. 본 논문에 개발된 기능으로 다수의 산불 발생위치를 실시간 식별이 가능하므로 산불 진화대책 수립을 위한 전체적인 화선정보를 보다 신속하게 획득할 수 있을 것으로 예상된다.

• Journal of Astronomy and Space Sciences
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• 제33권4호
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• pp.323-333
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• 2016

In this study, the uncertainty requirements for orbit, attitude, and burn performance were estimated and analyzed for the execution of the $1^{st}$ lunar orbit insertion (LOI) maneuver of the Korea Pathfinder Lunar Orbiter (KPLO) mission. During the early design phase of the system, associate analysis is an essential design factor as the $1^{st}$ LOI maneuver is the largest burn that utilizes the onboard propulsion system; the success of the lunar capture is directly affected by the performance achieved. For the analysis, the spacecraft is assumed to have already approached the periselene with a hyperbolic arrival trajectory around the moon. In addition, diverse arrival conditions and mission constraints were considered, such as varying periselene approach velocity, altitude, and orbital period of the capture orbit after execution of the $1^{st}$ LOI maneuver. The current analysis assumed an impulsive LOI maneuver, and two-body equations of motion were adapted to simplify the problem for a preliminary analysis. Monte Carlo simulations were performed for the statistical analysis to analyze diverse uncertainties that might arise at the moment when the maneuver is executed. As a result, three major requirements were analyzed and estimated for the early design phase. First, the minimum requirements were estimated for the burn performance to be captured around the moon. Second, the requirements for orbit, attitude, and maneuver burn performances were simultaneously estimated and analyzed to maintain the $1^{st}$ elliptical orbit achieved around the moon within the specified orbital period. Finally, the dispersion requirements on the B-plane aiming at target points to meet the target insertion goal were analyzed and can be utilized as reference target guidelines for a mid-course correction (MCC) maneuver during the transfer. More detailed system requirements for the KPLO mission, particularly for the spacecraft bus itself and for the flight dynamics subsystem at the ground control center, are expected to be prepared and established based on the current results, including a contingency trajectory design plan.

• 한국항공우주학회지
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• 제46권9호
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• pp.782-789
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• 2018

한국형 기동헬기(KUH)의 다기능시현기(MFD)는 항공기 운용 중 임무컴퓨터(MC)로부터 영상정보(항법, 비행, 생존, 지형 및 정비 관련 정보)를 입력받아 시현한다. 체계개발 단계에서 식별된 MFD 이상시현(화면 깜박임 현상 등)은 항공기 초도양산 과정에서 DVI 케이블 차폐 성능 개선과 DVI 케이블 장착 경로 변경을 통하여 해소하였다. 항공기 납품 후 1~2년 정도 경과하였을 때 MFD 이상시현이 다시 발생하였고, 파생형헬기 시험평가 과정에서도 식별되었다. 이러한 MFD 이상시현의 해결을 위하여 항공기 체계 단위의 종합 검토를 수행하였고, DVI 케이블의 개선을 통한 설계 개선방안을 도출하였다. 본 논문에서는 MFD 이상시현의 발생원인을 분석하였고, 설계 개선방안 검토과정을 정리하였다. 그리고 설계 개선사항에 대한 타당성을 DVI 케이블 조립체 비교시험, SIL/지상/비행시험 결과를 바탕으로 입증하였다.

• 한국항행학회논문지
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• 제26권5호
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• pp.358-364
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• 2022

항공용 인터콤 시스템은 정/부조종사 간 내부 통화 및 조종사와 승무원 간 내부 통화, 초고주파 무전기(U/VHF)와 같은 통신 장비를 통한 외부 통화, 초단파전방향거리탐지기/계기착륙장치(VOR/ILS), 전술 항법 장치(TACAN)와 같은 항법 및 임무 장비 오디오 신호 모니터링, 비행 데이터기록장치(FDR) 및 자료전송 시스템(DTS)으로의 음성 녹음용 오디오 신호 출력, 항공기의 상태와 위협 등에 대한 오디오 경고음/경고 음성 발생 등 항공기 내의 모든 음성 신호에 대한 처리를 담당하는 장비이다. 이러한 항공용 인터콤은 아날로그 오디오 신호의 경우 노이즈에 민감하기 때문에 조종사 및 승무원의 임무 수행을 위해 항공기 내/외부의 전자파 노이즈로부터 오디오 신호를 보호할 수 있는 이중화 설계가 필요하다. 본 논문에서는 항공용 디지털 인터콤의 이중화를 위한 정상/백업 운용모드 및 디지털 방식의 이중화 설계 방안과 제작 및 검증 결과에 대하여 기술한다.

• 천문학회지
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• 제56권2호
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• pp.263-275
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• 2023

The Sun-Earth Lagrange point L4 is considered as one of the unique places where the solar activity and heliospheric environment can be observed in a continuous and comprehensive manner. The L4 mission affords a clear and wide-angle view of the Sun-Earth line for the study of the Sun-Earth and Sun-Moon connections from he perspective of remote-sensing observations. In-situ measurements of the solar radiation, solar wind, and heliospheric magnetic field are critical components necessary for monitoring and forecasting the radiation environment as it relates to the issue of safe human exploration of the Moon and Mars. A dust detector on the ram side of the spacecraft allows for an unprecedented detection of local dust and its interactions with the heliosphere. The purpose of the present paper is to emphasize the importance of L4 observations as well as to outline a strategy for the planned L4 mission with remote and in-situ payloads onboard a Korean spacecraft. It is expected that the Korean L4 mission can significantly contribute to improving the space weather forecasting capability by enhancing the understanding of heliosphere through comprehensive and coordinated observations of the heliosphere at multi-points with other existing or planned L1 and L5 missions.

• 항공우주정책ㆍ법학회지
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• 제12권
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• pp.210-245
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• 2000

This study is to review the problem concerned with aviation safety in Korea and suggest the solution to secure the aviation safety, in respect of regulation. At first, the definition and characteristics of aviation safety are studied, and then the endeavor for the aviation safety of ICAO and FAA are reviewed. All the fields of aviation safety area are included in the scope of this study; airworthiness in aircraft production and maintenance, flight operation, airport operation and air traffic control. The level of safety can be estimated by the frequency of accidents and seriousness. The causes of air accidents can be summarized as five factors; human factor, traffic environment. aircraft, weather, and unexpected incident. The activities to protect accidents are also can be summarized as five areas; man, machine, medium, mission and management. ICAO established the standards and recommends for the aviation safety, and adopted strategic action plan for 21st century. Federal Aviation Administration of USA also contributes for the aviation safety of world wide. Nowadays, ICAO and FAA tries to coordinate each other to set up efficient and effective ways for the aviation safety. ICAO developed safety oversight manual and FAA developed model regulations, individually. However, there has been trials to merge the results of each institute's studies. The direction of this endeavor is to meet the new environment related to globalization of air transport industry. It is necessary for our government to improve the aviation safety regulation system to address the new wave of aviation safety system pursued by international organization. A systematic and comprehensive measure should be devised by cooperation of all the related field and area.

• 한국항공우주학회지
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• 제50권7호
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• pp.507-514
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• 2022

전술 표적에 대한 정보를 획득하기 위해 전투기에 탑재하는 EO/IR 정찰용 파드는 일반적으로 항공기 동체 하단에 장착 운영한다. 이러한 외부 장착물을 장착한 항공기는 외부 장착물 없이 비행하는 항공기에 비하여 복잡한 공력 및 관성력 특성을 갖기 때문에 개발 초기에 개발 위험요소를 사전에 식별하여 설계에 반영할 수 있는 시스템 성능 분석 도구가 필수적으로 필요하다. 본 연구에서는 고기동 환경에서 안정적으로 측정 데이터를 획득할 수 있는 파드를 개발하기 위해 필요한 모델링 및 시뮬레이션 도구 개발 방안을 제시하였다. 우선, 고기동 항공기에 탑재한 파드의 한계 운용조건을 도출하고, 한계 운용조건에 따른 탑재 파드의 공력 및 관성 하중을 분석하였으며, 탑재파드를 장착한 항공기의 임무 모사를 통한 비행데이터 생성 및 전송 시스템을 개발하였다.