• 품질경영학회지
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• 제41권4호
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• pp.725-735
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• 2013

Purpose: The purpose of this study is to propose an Integrated Safety Evaluation Process (ISEP) that can enhances the safety aspect of the safety-critical system. This process utilizes the advantages of the iterative Systems Engineering process combined with the safety assessment process that is commonly and well defined in many standards and/or guidelines for railway, aerospace, and other safety-critical systems. Methods: The proposed process model is based on the predefined system lifecycle, in each phase of which the appropriate safety assessment activities and the safety data are identified. The interfaces between Systems Engineering process and the safety assessment process are identified before the two processes are integrated. For the integration, the elements at lower level of Systems Engineering process are combined with the relevant elements of safety assessment process. This combined process model is represented as Enhanced Functional Flow Block Diagram (EFFBD) by using CORE(R) that is commercial modelling tool. Results: The proposed model is applied to the lifecycle and management process of the United States aircraft system. The US aircraft systems engineering process are composed of twelve key elements, among which the requirements management, functional analysis, and Synthesis processes are considered for examplenary application of the proposed process. To synchronize the Systems Engineering process and the safety assessment process, the Systems Engineering milestones are utilized, where the US aircraft system has thirteen milestones. Taking into account of the nine steps in the maturity level, the integrated process models are proposed in some phases of lifecycle. The flows of processes are simulated using CORE(R), confirming the flows are timelined without any conflict between the Systems Engineering process and the safety assessment process. Conclusion: ISEP allows the timeline analysis for identifying activity and data flows. Also, the use of CORE(R) is shown to be effective in the management and change of process data, which helps for the ISEP to apply for the development of safety critical system. In this study, only the first few phases of lifecyle are considered, however, the implementation through operation phases can be revised by combining the elements of safety activities regarding those phases.

• 환경영향평가
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• 제18권1호
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• pp.21-30
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• 2009

The study show that things about the noise control are indicated at The Noise & Vibration Control Act and the other Act. Also, the details program and total government ministries' program for the noise control are indicated what are the advance noise control plan. The study consist of the four part which are "Draw up the environmental noise infrastructure plan; the install shall be done the noisemap & the automatic noise measurement devices", "Resetting of environmental noise standard at the application area and Introduce of indoor noise; the guide for region classification of the noise standard & indoor noise", "Setting of aircraft noise standard and Program of measurement point operation; the noise-assessment-standard shall change from WECPN to new index($L_{den}$, $L_{dn}$, $L_{Aeq\;24h}$) & the operation and control of aircraft noise measurement changes from local environmental office to central control center" and "The method of noise regulation at construction site and the plan on making of standard for vibration regulation; It shall be made that the guideline of construction noise should include a target-construction, noise standard etc & the ministries shall unify control about construction vibration of the blasting vibration". The advance noise-policy will improve efficiency to deal with civil appeal & damage on residents about noise.

• 한국항행학회논문지
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• 제22권4호
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• pp.288-294
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• 2018

항공기의 엔터테인먼트 시스템은 고정된 모니터를 사용하는 대신에 승객 개인의 휴대용 전자기기를 사용하는 형태로 그 패러다임이 바뀌었다. 이로 인해 기내 설비는 간소해진 반면 휴대용 전자기기들의 전기 충전으로 안전에 대한 리스크는 증가되었다. 송신 기능이 없는 개인 휴대전자기기와 달리 와이파이 기능이 있는 전자기기(T-PED)의 사용이 허용되고 기내에서 배터리의 충전도 요구된다. 본 연구에서는 기내 무선 환경과 엔터테인먼트 서비스의 변화에 따른 영향을 조사하기 위해 NASA 항공안전보고시스템을 이용하여 기내 전자기기 사용 관련 자료를 분석하였다. 이를 기초로 하여, 항공기 안전관리 관점에서 비행 중에 발생된 객실 전자장비나 승객 휴대용 전자기기(특히 스마트폰)로 인한 이벤트 발생 사례를 공유하여 개인용 전자기기의 위험성을 분석하였다. 이러한 분석을 위해 잠재적 위해요인의 식별과 리스크 평가 작업이 수행되었으며, 최종적으로 휴대용 전자기기의 안전한 사용을 위한 리스크 완화 전략이 제시되었다.

• 한국항행학회논문지
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• 제27권4호
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• pp.356-364
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• 2023

항행 정밀도 증가는 항공교통 수용량을 개선함으로써 효율적인 공역 환경을 조성하였으나, 항공안전 측면에서는 항공기 간 충돌확률을 증가시키는 요인으로 작용하였다. 항공기가 고도 분리에 실패하더라도 좌우 위치 오차를 갖는 경우 충돌로 이어지지 않지만, 좌우 위치 정밀도가 증가하면 위치 랜덤성이 줄어들어 항공기 충돌확률이 증가하게 된다. 이에 따라 국제민간항공기구는 항공기를 항공로 중심선으로부터 의도적으로 이탈시키는 SLOP (Strategic Lateral Offset Procedures) 절차를 도입하였으며, 우리나라 또한 이와 유사한 Offset 절차를 운영하고 있다. Y579 항공로는 22년 말 복선화되기 전까지 offset 절차로 운영되었으며, Y579 offset 항적 분석결과 SLOP 절차와 달리 단방향 복선 항공로와 유사함을 확인하였다. 본 논문은 단방향 복선 항공로 및 offset 절차에 적용 가능한 안전평가 방법론을 개발하고 이를 활용하여 Y579 Offset 절차에 대한 안전평가를 수행하였다.

• 한국항행학회논문지
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• 제28권4호
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• pp.518-523
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• 2024

드론의 폭발적 수요 증가로 인하여 저고도 공역에서 운항하고 있는 기존 항공기 및 국가 중요시설 안전에 큰 위협을 초래하고 있다. 저고도 공역 드론 안전위협의 종류 및 정도를 판단하기 위하여 각 분야의 항공종사자를 대상으로 저고도 공역 운항시 드론으로 부터의 위협 종류 및 형태를 AHP (analysis hierachy process) 분석을 통하여 가중치를 평가하고자 한다. 드론으로부터의 위협요소 계층도 구성은 항공선진국인 유럽 항공안전기구 (EASA)에서 선행 연구된 특정 운영 위험평가 SORA(specific operation risk assessment process) 기법을 활용하여 설계하였다. 이를 바탕으로 각 항공기 운항 및 임무수행간 사전 위해요인을 식별 제거함으로써, 기존 항공기들의 저고도 안전 운항을 확보할 수 있을 것이다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.430-435
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• 2007

소음특성이 서로 다른 군용 항공기 소음과 민간 항공기 소음을 환경부에서 고시한 소음 진동공정시험방법에 의거하여 소음을 측정하고 평가하는데는 개선되어야 할 문제점이 뒤따른다. 따라서 본 연구에서는 민간 항공기와 군용 항공기의 소음특성으로 조사하고 소음 측정 및 평가방법에 대한 문제점들을 고찰하였다. 연구결과로 부터, 민간 항공기나 군용 항공기의 정확한 소음측정을 위해서는 동특성을 빠름(Fast)으로 설정하여 측정하는 것이 바람직한 것으로 확인되었다. 또한 등가 소음도를 측정하여 항공기 소음을 평가하는 방식은 민간 항공기 소음평가시에는 적절하지만, 이를 군용 항공기 소음에 적용하여 평가할 때에는 상당한 오차를 포함하는 것으로 조사되었다. 그리고 군용 항공기 이 착륙지점에서의 소음 지속시간이 대부분 30초를 초과하는 것으로 조사되었기 때문에, 군용 항공기 소음평가시에는 지속시간에 대한 보정이 반드시 반영되어야 할 것으로 사료된다.

• Advances in aircraft and spacecraft science
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• 제4권2호
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• pp.185-202
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• 2017

In a flexible airvehicle, an assessment of the structural coupling levels through analysis and experiments provides structural data for the design of notch filters which are generally utilized in the flight control system to attenuate the flexible response pickup. This is necessitated as during flight, closed loop control actuation driven with flexible response inputs could lead to stability and performance related problems. In the present work, critical parameters influencing servoelastic response have been identified. A sensitivity study has been carried out to assess the extent of influence of each parameter. A multi-parameter tuning approach has been implemented to achieve an enhanced analytical model for improved predictions of aircraft servoelastic response. To illustrate the model updation approach, initial and improved test analysis correlation of lateral servoelastic responses for a generic flexible airvehicle are presented.

• 한국환경과학회지
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• 제23권12호
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• pp.2089-2099
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• 2014

Emissions from aircraft have impacts on the air pollution of airport and the surrounding area. There are methods of emissions calculated as Tier 1, Tier2, Tier 3A and Tier 3B. Thus, this study investigated emissions from aircraft at the Gimhae International Airport using EDMS(Emissions & Dispersion Modeling System) program. Results of estimation from aviation emissions, Tier 3B considering all parts which can occur at the airport has the largest amount emissions. In order to understand the relation between aviation emissions and distribution of ozone concentration over airport area, numerical evaluation were carried out. Although the difference of surface ozone distribution between numerical assessment with and without aviation emissions was little, effects of air pollution at airport area from aviation emissions of NOx and VOCs.

• Nuclear Engineering and Technology
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• 제48권2호
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• pp.505-517
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• 2016

The structural integrity of a dual-purpose metal cask currently under development by the Korea Radioactive Waste Agency (KORAD) was evaluated, through numerical simulations and a model test, under high-speed missile impact reflecting targeted aircraft crash conditions. The impact conditions were carefully chosen through a survey on accident cases and recommendations from literature. In the impact scenario, a missile flying horizontally hits the top side of the cask, which is freestanding on a concrete pad, with a velocity of 150 m/s. A simplified missile simulating a commercial aircraft engine was designed from an impact loade-time function available in literature. In the analyses, the dynamic behavior of the metal cask and the integrity of the containment boundary were assessed. The simulation results were compared with the test results for a 1:3 scale model. Although the dynamic behavior of the cask in the model test did not match exactly with the prediction from the numerical simulation, other structural responses, such as the acceleration and strain history during the impact, showed very good agreement. Moreover, the containment function of the cask survived the missile impact as expected from the numerical simulation. Thus, the procedure and methodology adopted in the structural numerical analyses were successfully validated.

• Nuclear Engineering and Technology
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• 제50권8호
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• pp.1387-1401
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• 2018

An aircraft impact (AI) on a nuclear power plant (NPP) is considered to be a beyond-design-basis event that draws considerable attention in the nuclear field. As some NPPs have already adopted the seismic isolation technology, and there are relevant standards to guide the application of this technology in future NPPs, a new challenge is that nuclear power engineers have to determine a reasonable method for performing AI analysis of base-isolated NPPs. Hence, dynamic influences of the seismic isolation on the vibration and structural damage characteristics of the base-isolated CPR1000 containment are studied under various aircraft loads. Unlike the seismic case, the impact energy of AI is directly impacting on the superstructure. Under the coupled influence of the seismic isolation and the various AI load, the flexible isolation layer weakens the constraint function of the foundation on the superstructure, the results show that the seismic isolation bearings will produce a large horizontal deformation if the AI load is large enough, the acceleration response at the base-mat will also be significantly affected by the different horizontal stiffness of the isolation bearing. These concerns require consideration during the design of the seismic isolation system.