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- 저자 : 안재모 ( Jae Mo Ahn ) (검색결과 6 건)
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항공안전시스템 개발의 경제적 효과 분석 -다변측정감시시스템(MLAT) 기술 개발 사례를 중심으로-
안재모 ( Jae Mo Ahn ),허희영 ( Hee Young Hur ),지용선 ( Yoong Seon Ji ),박원근 ( Won Geun Park ) 한국항공경영학회 2013 한국항공경영학회지 Vol.11 No.2
오늘날 지속적인 항공교통량의 증가는 기존의 레이더에 기반하고 있는 항공감시체계로 하여금 수용 능력의 한계를 노출하고 있다. 최근 선진국을 중심으로 항공관제 분야에서는 디지털을 기반으로 하는 새로운 첨단 감시시스템의 도입 필요성을 적극 추진하고 있다. 특히 항공안전을 확보하기 위해 차세대 감시시스템으로 다변측정감시(MLAT:Multilateration)와 방송형 자동종속감시(ADS-B:Automatic Dependant Surveillance - Broadcast) 시스템의 도입이 세계적으로 진행되고 있다. MLAT은 성능과 경제성 및 호환성이 우수하고, 적용 분야가 다양함에 따라 향후에는 현재의 레이더 기반 감시시스템이 MLAT와 ADS-B 감시기술이 융합된 항공감시체계로 전환될 전망이다. 본 연구에서는 항행안전시스템의 개발에 따른 경제적 효과를 분석하였다. 분석방법으로는 기술개발의 소요비용과 활용에 따른 효익(效益)을 각각 추정된 현금흐름의 현재가치로 산출하고, 이를 이용하여 비용편익(cost-benefit) 분석을 적용하였다. 분석 결과, LAM(Local Area MLAT)을 활용할 경우, BCR은 8.2로 나타났으며, WAM(Wide Area MLAT)을 활용할 경우는 BCR이 24.5로 높게 나타났다. 이와 같은 결과는 MLAT 시스템의 경제성이 유의적임을 의미하며, 현재 유사한 기능을 수행하는 ADS-B가 갖는 한계점을 해결할 수 있는 방안으로 판단된다. 특히 MLAT 구축은 군수용(軍需用)을 포함한 민간항공의 저고도 항공기의 취약한 항공안전성을 확보하는 대안으로 평가된다. 또한 경제적 효과 외에도 항공교통의 안전성을 확보하는 동시에 항공선진국을 지향하는 우리나라의 항공체계전반을 개선하는 효과가 있는 것으로 해석된다. Continuous increase of the volume of air traffic has performance limit of radar-based aviation surveillance system. So, developed countries are recently promoting to adapt a new high-tech surveillance system based on digital technology. Expecially, it is introducing system for next-generation monitoring system like MLAT(Multilateration) and ADS-B(Automatic Dependant Surveillance - Broadcast) world widely. As MLAT is superior at high performance, economic feasibility, compatibility, and diverse applications, for the future, it is expected that current radar-based surveillance system to be switched over to aerial surveillance system which is fused MLAT with ADS-B surveillance system. This study investigated the economic effect on the development of Aviation Safety System. It is analyzed that cost for development and cost-benefit of utilizing the developed system were calculated into the present value of each expected cash flow and applied cost-benefit analysis. As a result, when it is utilizing LAM(Local Area MLAT), BCR (Benefit Cost Ratio) is 8.2 and when it is utilizing WAM(Wide Area MLAT), BCR is 24.5. It`s presumed that the MLAT system is sensorized equipment which is more convenient and easier to use than existing radar-using system, cheaper operation and maintenance cost, and also it is the equipment (which) seems to be able to overcome the limitations ADS-B has. Establishing MLAT is the way that can secure flight safeness which is vulnerable in low altitude aircraft like used in civilian and air force, also it is the way can secure nation`s flight safeness over the economic feasibility, and it might has improvement for overall Korea aviation system who is aim to aviation advanced country.
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지용선 ( Yoong Seon Ji ),안재모 ( Jae Mo Ahn ) 한국항공운항학회 2011 한국항공운항학회지 Vol.19 No.4
Korea`s aerospace industry tries to achieve the exports goal in 2020, 10 billion dollars, in accordance with the "Future aviation industry development master plan", but it`s skill is still not keeping pace. To secure and improve the appropriate technology, it is desperately needed to cooperate with advanced countries or companies of aerospace industry, but they are liked to manage their technology transfer or demand tremendous high price. This study presents that Russia could be a another nation which is able to cooperation on aerospace industry. Although Russia had have superior technology in aerospace industry, they have lost the competitiveness on that field after the collapse of the Soviet Union. Now, they are trying to regain their original fame in the commercialized way. So, this study suggests practical ways which South Korea and Russia may be helpful each other based on experiences working together.
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論文(논문) : 군관제사의 직무 수행과 항공교통상황 변인의 영향 연구
신현삼 ( Hyon Sam Sin ),장정하 ( Jung Ha Jang ),안재모 ( Jae Mo Ahn ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.1
The air traffic situation variables were emphasized in this research to review the awareness level of job performance of military air traffic controllers in application of air traffic situation variables such as detection of aircraft identification, type of aircraft, position ,speed, altitude, determination of separation between departing and arriving in-trail aircraft, physical airport conditions, adverse weather conditions, NAVAID outage and ATC facilities` operational status. In this respect, This study was conducted under the auspice of ATC facility operating agencies and devoting air force air traffic controller`s participation by answering the questionnaires from nine radar approach control facilities and other air traffic control towers.
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레이저빔에 의한 조성구배계면 Ni/Steel 재료의 제조
안재모,김도훈 한국레이저가공학회 1999 한국레이저가공학회지 Vol.2 No.1
This work was carried out as a fundamental experiment to fabricate a Graded-Boundary Ni/Steel material using a laser beam. A Ni sheet was placed on a steel substrate, and then a series of high power CO₂ laser beams were irradiated on the surface in order to produce a homogeneous alloyed layer. The processing parameters were : 4 kW laser power, 2m/min traverse speeds, -2mm defocuing, 17 1/min sheiding gas flow rates. The sequential repetition of the laser surface alloying treatment up to 4 times, resulted in about 5mm thick of fair compositional gradient systems. In order to determine the microstructure, phase and compositional profiles in this material, optical microscopy, XRD and EDS were used. The compositions varied from 66% to 0% Ni and 34% to 100% for Fe in this material. The microstuctures were typical morphologies of rapid solidification and solid-state cooling. Since compressive stress was formed in the heat affected region due to martensitic transformation, while relative tensile stress was developed in the alloyed region, cracks were formed between the alloyed region and the substrate region.
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