• 항공우주시스템공학회지
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• 제12권5호
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• pp.76-88
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• 2018

미 항공우주국(NASA), 유럽우주기구(ESA) 등의 우주기관 및 미국 군에서는 제품보증 수행에 대한 요구조건 및 계획 등에 대한 가이드라인 또는 표준서를 제시하고 있다. 최근 들어, 세계의 주요 위성제작사는 테일러링(tailoring)을 통해 과도한 제품보증 요구조건 및 프로세스를 완화하고 있다. 비용 및 일정의 효율성을 증진시키기 위한 테일러링을 수행한다는 의미이다. 제품보증 테일러링은 임무, 임무 리스크의 유형, 복잡도, 개발비용 및 수명주기 등의 다양한 인자를 기준으로 수행될 수 있다. 본 연구에서는 NASA에서 제안된 임무 리스크(mission risk) 분류에 따른 제품보증 업무를 조사하고, 개발비용 및 일정의 최적화를 위한 테일러링 방안을 제시한다. 특히, 국내에서 개발하여 운용 중이거나 개발 중인 위성에 대한 임무 리스크 유형을 정의하고 이들에 대한 제품보증 특성을 비교 분석한다.

• 한국항공운항학회지
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• 제31권2호
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• pp.46-54
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• 2023

Helicopter pilots are required to perform many visual workloads in topographical avoidance, flight path modification and navigation, because helicopters operate at very low altitudes. The helicopter-specific instability also require the pilot to have precise perception and control. This has caused frequent human error in helicopter accidents. In Korea, two to three cases have occurred annually on average over the past 10 years, and this trend has not decreased. The purpose of this study was to identify human error risks in advance to prevent helicopter accidents and to help develop measures for missions and mission phases with high risk of human error. Through the study, the tasks and mission phases where accidents occur frequently were classified and the risk of human error was calculated for each mission phases. To this end, the task of frequent accidents during helicopter missions was first identified, detailed steps were classified, and the number of accidents was analyzed. Next, the AHP survey program was developed to measure the pilot's risk of human error and the survey was conducted on the pilots. Finally, the risk of human error by helicopter mission and by mission phases calculated and compared with the actual number of accidents.

• 한국안전학회지
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• 제26권6호
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• pp.104-110
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• 2011

In FMEA, the risk priority number(RPN) is used for risk evaluation on each failure mode. It is obtained by multiplying three components, i.e., severity, occurrence, and detectability of the corresponding failure mode. Each of the three components are usually determined on the basis of the past experience and technical knowledge. But this approach is not strictly objective in evaluating risk of a given failure mode and thus provide somewhat less scientific measure of risk. Assuming a homogeneous Poisson process for occurrence of the failures and causes, we propose a more scientific approach to evaluation of risk in FMEA. To quantify severity of each failure mode, the mission period is taken into consideration for the system. If the system faces no failure during its mission period, there are no losses. If any failure occurs during its mission period, the losses corresponding to the failure mode incurs. A longer remaining mission period is assumed to incur a larger loss. Detectability of each failure mode is then incorporated into the model assuming an exponential probability law for detection time of each failure cause. Based on the proposed model, an illustrative example and numerical analyses are provided.

• 항공우주시스템공학회지
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• 제9권2호
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• pp.41-46
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• 2015

The various risk factors that affected schedule, costs and mission success, etc. in development of the satellite. This paper derives the considerable "Cost of Quality" factors in the satellite development phase through the survey of practical techniques in respect of measurement of quality cost in the commercial products manufacturing, and proposes mitigation strategy of quality cost using the approach that can be minimized it.

• 한국항공운항학회지
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• 제27권2호
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• pp.47-53
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• 2019

The development of the aviation industry and the changes in the military operation mission environment are demanding more long - distance operation (long - time flight), and such a flying environment is a risk factor for fatigue - related accidents. For the aviation related organizations such as ICAO and FAA, fatigue risk management system (FRMS) are applied along with flight time restriction regulations to prevent fatigue related accidents. The most important process in FRMS is fatigue risk management. Fatigue risk management systematically manages fatigue through scientific fatigue risk data collection and fatigue risk assessment. The purpose of this study is to applicate the assessment of scientific fatigue risk management to pilots of airplanes engaged in long flight. We reviewed the current state of risk management and FRMS through previous research. We also developed fatigue risk management indicators and examined the validity of internationally recognized fatigue risk data collection methods and fatigue risk assessment tools. There are 134 mission (flight) data used for development. In order to verify the indicators, the fatigue risk score between the items was assigned through pair-wise comparison. In addition, the verify test results were normalized.

• 항공우주기술
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• 제8권2호
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• pp.127-132
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• 2009

본 논문에서는 단일 임무운용 개념에서 벗어나 향후 다수의 위성들을 동시에 직접 제어 하거나, 임무가 상이하더라도 주요 핵심시스템을 근간으로 각 위성마다 소요되는 임무운용 시스템을 개발함에 있어 개발기간을 획기적으로 줄일 수 있는 차세대 통합형 임무운용시스템 개발을 위한 분석 및 설계결과를 기술하였다. 이를 위해 우주개발선진국들의 통합지향형 임무운용시스템 개발 추세 및 개발 동향을 살펴보고, 각 시스템들의 주요 기능을 수행하는 공통 핵심시스템의 구조도 분석하였으며 설계 결과를 제시하였다.

• 융합보안논문지
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• 제24권2호
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• pp.189-200
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• 2024

최근 국방 기술의 발전은 인공지능이 탑재된 드론과 같은 첨단 자산의 도입으로 디지털화되고 있다. 이러한 자산들은 산업용 사물 인터넷, 인공지능, 클라우드 컴퓨팅 등의 현대 정보기술과 통합되어 국방 영역의 혁신을 촉진하고 있다. 그러나 해당 기술의 융합이 사이버 위협의 전이 가능성을 증가시키고 있으며, 이는 국방 자산의 취약성을 증가시키는 문제로 대두되고 있다. 현재의 사이버 보안 방법론들이 단일 자산의 취약점에 중점을 두는 반면, 임무 수행을 위해서는 다양한 군사 자산들의 상호 연동이 필요하다. 따라서 본 논문은 이러한 문제를 인식하고, 임무 기반의 자산 관리 및 평가 방법론을 제시한다. 이는 임무 수행에 중요한 자산을 식별하고, 사이버 보안 측면에서의 취약점을 분석하여 국방 부문의 사이버 보안성 강화를 목표로 한다. 본 논문에서는 임무를 수행하기 위한 기능과 자산 간의 연계분석을 통해 임무 종속성을 분류하며, 임무에 영향을 미치는 자산을 식별 및 분류하는 방안을 제안한다. 또한, 공격 시나리오를 통해 핵심 자산 식별 사례연구를 수행했다.

• 항공우주의학회지
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• 제30권3호
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• pp.113-129
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• 2020

With the operation of the KC-330 MRTT (Multi Role Tanker Transport), which had been fielded in 2019, the ROKAF (Republic of Korea Air Force) has given fighter pilots a new mission of air refueling. As a result, fighter pilots are more likely to be exposed to risks they have never faced before, and it is necessary to look at the risk factors associated with human factors in air refueling missions. Therefore, in this study, an analysis using the HFACS (Human Factors Analysis and Classification System) model was performed for fighter pilots with air refueling qualifications. This study tried to prevent hazard in advance by discriminating the risk factors according to the human factors related to the fighter pilot during the air refueling mission.

• 한국수소및신에너지학회논문집
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• 제34권3호
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• pp.297-306
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• 2023

The frequency of fatal accidents that can occur at hydrogen refueling station was compared with the risk criterion for the general public suggested by the health and safety executive. If hydrogen refueling station meets the accident prevention facility standards presented in KGS Code FP216/217, it was confirmed that the risk of hydrogen refueling station was not at an unacceptable (intolerable) risk level. However, the risk of hydrogen refueling station due to small leak was analyzed as low as reasonably practicable. Therefore, methods for improving the safety instrumented function of hydrogen refueling station were reviewed. It was confirmed that the risk of hydrogen refueling station can be affected by the number of installed safety instrumentation system components, redundant architecture, mission time, proof test interval, etc. And methods for maintaining the risk of hydrogen refueling station at an acceptable risk level have been proposed.

• 항공우주시스템공학회지
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• 제15권4호
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• pp.64-74
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• 2021

Unmanned Aircraft Systems (UAS) are rapidly emerging not only as a key military power, such as surveillance and reconnaissance for military purposes but also as a new air transportation means in the form of Urban Air Mobility (UAM). Currently, airworthiness certification is carried out focused on the verification of technical standards for flight safety suitability of aircraft design in accordance with the Military Aircraft Flight Safety Certification Act and does not employ the model for operational risk assessment for mission areas and airspace. In this study, in order to evaluate the risk of the mission area from the perspective of the UAS operator, a risk assessment simulation has been conducted by applying the Specific Operations Risk Assessment (SORA) model to the operating environment of the Korean military UAS. Also, the validity of the SORA model has been verified through the analysis of simulation results, and a new application plan for airworthiness certification of the military unmanned aerial system has been presented.