• Journal of Aerospace System Engineering
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• v.15 no.3
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• pp.20-29
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• 2021

As the feasibility of urban air mobility (UAM) service using electric vertical take-off and landing (eVTOL) aircraft increases due to aircraft electrification, distributed propulsion, and artificial intelligence technologies, the U.S. and European aeronautical societies have been improving their certification system and regulations for the type certification of eVTOL. The improved certification system is expected to be ready in the near future, after the European Union Aviation Safety Agency (EASA) proposed the VTOL Special Condition, SC-VTOL in 2019. However, the current domestic certification system is still insufficient to properly respond to eVTOL. This study investigated the development trends of foreign eVTOL and certification systems, identified considerations to improve the domestic certification system, and proposed the measures for type certificates and type certificates validation of eVTOL based on the comparison between SC-VTOL and Korea airworthiness standards (KAS).

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.128-128
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• 2019

증발산량은 수표면이나 토양면에서 수증기의 형태로, 대기중으로 방출되는 증발량과 식물의 엽면을 통해 지중의 물이 대기 중으로 방출되는 증산량의 합으로, 기상학과 수문학에 사용되는 중요한 농업기상 매개 변수이다. 증발산량을 관측하는 방법으로는 라이시미터 (Lysimeter)와 같은 관측장비를 통해 실제 증발산량을 측정하는 방법과, FAO-56 Penman-Monteith (PM)과 같은 증발산량 추정 알고리즘을 이용하여 산출하는 방법이 있다. 국내의 경우 기상관측소에서 수집한 데이터를 이용하여 증발산량 추정공식을 통해 증발산량을 산정하는 연구가 이루어졌으며, 위성영상에 기반하여 증발산을 추정하려는 연구가 진행되고 있다. 본 연구에서는 미국 항공우주국 (National Aeronautics and Space Administration, NASA)에서 추진하는 위성을 이용한 지구 전역의 장기관측 계획 EOS (Earth Observing System)에 의해 발사된 지구 관측 위성인 MODIS Terra 위성에서 제공되는 MOD16A2 위성영상을 사용하였다. MOD16A2 위성영상은 2001년부터 현재까지 500m의 픽셀 단위로 제공되는 8일 간격의 전지구 규모의 위성영상으로, 본 연구에서는 우리나라 관측소에서 관측된 기상인자를 PM 공식에 입력하여 산정된 증발산량 값과 MOD16A2 위성영상 데이터를 비교하여 우리나라 MOD16A2 위성영상 적용성 및 밭작물 가뭄분석에 적용하였다.

• Atmosphere
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• v.33 no.2
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• pp.275-295
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• 2023

In Korea, there are four institutions related to atmospheric science: the university's atmospheric science-related department, the Korea Meteorological Administration (KMA), the ROK Air Force Weather Group, and the Meteorological Industry Association. These four institutions have developed while maintaining a deep cooperative relationship with the Korea Meteorological Society (KMS) for the past 60 years. At the university, 6,986 bachelors, 1,595 masters, and 505 doctors, who are experts in meteorology and climate, have been accredited by 2022 at 7 universities related to atmospheric science. The KMA is carrying out national meteorological tasks to protect people's lives and property and foster the meteorological industry. The ROK Air Force Weather Group is in charge of military meteorological work, and is building an artificial intelligence and space weather support system through cooperation with universities, the KMA, and the KMS. Although the Meteorological Industry Association has a short history, its members, sales, and the number of employees are steadily increasing. The KMS greatly contributed to raising the national meteorological service to the level of advanced countries by supporting the development of universities, the KMA, the Air Force Meteorological Agency, and the Meteorological Industry Association.

• Korean Journal of Remote Sensing
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• v.35 no.6_3
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• pp.1161-1171
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• 2019

As there is a growing interest in remote sensing applications, the Korean Society of Remote Sensing has published several special issues in which articles on specific research topics were collected. In this special issue, we first review the research topics on several special issues published in the Korean Journal of Remote Sensing by 1) the National Institute of Agricultural Sciences (NAS), the Korea Environment Institute (KEI), the Ministry of Environment (ME) and the Korea Aerospace Research Institute (KARI) in 2017 and 2) the Korea Institute of Ocean Science and Technology (KIOST), the Korea Polar Research Institute (KOPRI), KARI, and Korea Meteorological Administration (KMA) in 2018. Then, research articles on the remote sensing applications in Korea are introduced.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.7
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• pp.55-62
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• 2006

This thesis describes collision avoidance using fuzzy logic based on "Right of way" rules of ICAO and FAA and pilot's experiences for Unmanned Aerial Vehicle(UAV). To apply the rules, we designed fuzzy logic based collision avoidance system. And we also designed decision logic for enable condition of collision avoidance system. Decision logic have three kinds of core key, i.e. Relative Range, Time of CPA(Closest Point of Approach) and Distance at CPA. Application of decision logic made a possible to avoid NMAC(Near Mid-Air Collision) and it has been verified through several simulations. To conclude, we proposed the method to carry out "See and Avoid" ability on UAVs, which is capability to mingle with manned aircraft in civil airspace.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.43 no.8
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• pp.722-730
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• 2015

Drive mechanism of multi-axis pintle thrusters for DCS(Divert Control System) was designed to meet the needs of minimizing the number of driving motors. In this study, preliminary model was designed in order to implement appropriate pressure control and thrust distribution. Based on the preliminary model study, the drive mechanism for DCS multi-axis pintle thrusters using piston was designed and evaluated by using AMESim software. Results show that three driving motors are enough to actuate four pintle thrusters.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.6
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• pp.446-459
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• 2019

The purpose of this paper is to investigate the current technical status and future prospects regarding helicopter simulators. In the introduction section, we briefly summarize the concept of the simulator and the development history of helicopter simulators. In the main section, the development status of helicopter simulation technology is first presented and the FAA/EASA certification is then introduced as a verification method for the reliability evaluation of the developed simulator technology. In addition, several issues that need to be resolved along with future development directions are discussed to improve the reliability of helicopter flight simulator.

• Journal of Aerospace System Engineering
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• v.13 no.1
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• pp.62-68
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• 2019

The software installed on an aircraft is directly related to its safety. Therefore, it shall comply with the standards of the airworthiness certification to ensure safety of flight. Airborne software should be developed in accordance with the DO-178 (Software Consideration in Airborne Systems and Equipment Certification) to comply with the airworthiness certification criterion. However, the military airborne software has been developed in accordance with the DAPA weapons system software development and management manual. In this paper, we completed a questionnaire survey of software experts. We also suggest a military airborne software development/certification process based on DO-178.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.12
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• pp.1232-1237
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• 2009

The ICAO and FAA are developing and verifying of GBAS for civil aircraft landing and take-off. The guarantee of aircraft integrity issue is the important part of GBAS. To guarantee integrity, the GBAS ground facility broadcasts various informations to aircraft. The informations are related to the estimated accuracy of each pseudorange correction and the estimated error terms, for example B-value and standard deviation of the ground facility error. These parameters are used to calculate position error (estimated value of the user). If estimated position errors don't satisfy requirements, aircraft use alternate navigation means. In this paper, GBAS reference stations's real data, which operated by KARI (Korea Aerospace Research Institute) in Jeju international airport, are used to development of new ground facility error standard deviation model. We verify improvement of GBAS availability, with respected to vertical protection level, using B-value based a new ground facility error standard deviation model and a sigma inflation factor.

• Journal of Aerospace System Engineering
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• v.17 no.6
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• pp.108-117
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• 2023

Thus far, a mission software component of the KT-1 military fixed-wing aircraft for overseas export has been developed through international joint development with foreign companies. The reliability of the software component could be certified by complying with the development environment and procedures of foreign companies based on DO-178B. However, recently, DO-178C certification is required for overseas exports, and reliability tests to comply with the weapon system software development guidelines are required for domestic military forces. In this paper, we describe the problems in obtaining domestic airworthiness certification in the international joint development of a previously developed KT-1 export-typed aircraft system integration project. To this end, we find a solution to comply with both DO-178C and the Weapon System Software Development and Management Manual and provide the optimal software reliability test method.