• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2005년도 춘계학술대회
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• pp.302-305
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• 2005

To comply to demand for a development requirement of aircraft design part, the expert system builds up standard knowledge-base based on presently maintained expert knowledge and experience in aircraft structure material selection. It also builds up database based on aircraft design open data, and standard calculation module used for present design and analysis method. This system is developed using Visual Basic language. The expert system standardize aircraft structure material selection and can be applied to all type of elementary stage of aircraft structure design. It is working on Windows, which has a friendly interface and is convenient for debugging, maintenance and transplanting. Explanation of the structure and the function of the system was given in this paper.

• 한국컴퓨터정보학회논문지
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• 제20권10호
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• pp.77-83
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• 2015

This paper suggests heuristic algorithm to obtain optimal solution of minimum number of delay aircraft in airport arrivals/departures problem. This problem can be solved only mathematical optimization method. The proposed algorithm selects the minimum delays capacity in various airport capacities for number of arrivals/departures aircraft in $i^{th}$ time interval (15 minutes). In details, we apply median selection method and left-right selection method. This algorithm can be get the optimal solution of minimum number of delay aircraft for sixes actual experimental data.

• 한국항공운항학회지
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• 제17권4호
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• pp.55-62
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• 2009

The Prime objectives of this study are to identify and analyze possible solutions and select a solution for the specification and operation plan of the meteorological purpose aircraft in Korea. Infrastructure like meteorological purpose aircraft and aircraft operating systems should be set up and their efficient plan must be established to improve meteorological technic in Korea. As a result of the study, we have found that the turboprop engine powered aircraft is the most suitable to initial model for the meteorological purpose aircraft. It was found that the indirect operation method might be the best solution, also. The results of this study may be useful to make decision for selecting specification and operation of the meteorological purpose aircraft.

• 항공우주시스템공학회지
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• 제4권3호
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• pp.34-38
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• 2010

ACN(Aircraft Classification Number) is allocated by marketing group during early stage of aircraft design phase and is a critical parameter to decide whether the designed aircraft can be landed or not in a certain airport. The loading on the main landing gear wheels, selection of main landing gear tire and estimation of ACNs for flexible and rigid pavements were done for the proposed medium-class aircraft. The estimated ACN values are compared with the similar class aircraft. And PCN(Pavement Classification Number) values of airport in Korea are surmmarized. Results showed that the currently proposed medium-class aircraft can land any airport in Korea.

• 한국군사과학기술학회지
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• 제25권3호
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• pp.311-320
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• 2022

In this paper, we studied the optimal method of improving performance for aircraft having various variants within the same type. The study defined configuration of an entire fleet of aircraft being subject to a performance improvement program. And selected the most complicated aircraft configuration among them as a Standard Aircraft for modification by according to the proposed Aircraft Selection Process for developing an optimal Aircraft Performance Improvement Process. Based on the selected the Standard Aircraft, drew a system integration design result and carried out Evaluation Test and obtained Airworthiness Certification. Created the database with the design data of the Standard Aircraft, Evaluation Test, and Airworthiness Certification results, and applied it to variants of aircraft to complete the performance improvement program with optimized schedules and costs. By applying the proposed method to IFF performance improvement program, drew optimal system integration design and completed the program with minimized schedule.

• 마이크로전자및패키징학회지
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• 제22권4호
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• pp.1-5
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• 2015

In high temperature aircraft electronics, aluminium based brazing filler is the prime choice today. Aluminium and its alloys have compatible properties like weight minimization, thermal conductivity, heat dissipation, high temperature precipitation hardening etc. suitable for the aerospace industry. However, the selection of brazing filler for high temperature electronics requires high temperature joint strength properties which is crucial for the aerospace. Thus the selection of proper brazing alloy material, the composition and brazing method play an important role in deciding the final reliability of aircraft electronic components. The composition of these aluminium alloys dependent on the addition of the various elements in the aluminium matrix. The complex shapes of aluminium structures like enclosures, heat dissipaters, chassis for electronic circuitry, in avionics are designed from numerous individual components and joined thereafter. In various aircraft applications, the poor strength caused by the casting and shrinkage defects is undesirable. In this report the effect of various additional elements on Al based alloys and brazing fillers have been discussed.

• 한국항공운항학회지
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• 제20권4호
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• pp.70-75
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• 2012

This paper is part of the research about the selection and justification of Jeju international airport as an aircraft category 'F' alternative airport, which is the results of an weather analysis based on meteorological statistics. As the results of the study, it has been only 1 day per year (58minutes) that weather conditions of Incheon and Jeju international airports, from January 2006 to June 2011, are below landing weather minimums of each airport at the same times. This means that these airports are not within the same meteorological region, which is against the current orthodoxy. In addition, it is very rare that weather conditions of Jeju international airports are below landing weather minimums when Incheon international airport is below landing weather minima. It shows that the meteorological characteristics of these regions differ widely and the designation of Jeju international airport as an alternative airport is scientifically reasonable.

• Nuclear Engineering and Technology
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• 제49권2호
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• pp.404-410
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• 2017

In order to help decision-makers in the early design phase to improve and make more cost-efficient system safety and reliability baselines of aircraft design concepts, a method (Multi-objective Optimization for Safety and Reliability Trade-off) that is able to handle trade-offs such as system safety, system reliability, and other characteristics, for instance weight and cost, is used. Multi-objective Optimization for Safety and Reliability Trade-off has been developed and implemented at SAAB Aeronautics. The aim of this paper is to demonstrate how the implemented method might work to aid the selection of optimal design alternatives. The method is a three-step method: step 1 involves the modelling of each considered target, step 2 is optimization, and step 3 is the visualization and selection of results (results processing). The analysis is performed within Architecture Design and Preliminary Design steps, according to the company's Product Development Process. The lessons learned regarding the use of the implemented trade-off method in the three cases are presented. The results are a handful of solutions, a basis to aid in the selection of a design alternative. While the implementation of the trade-off method is performed for companies, there is nothing to prevent adapting this method, with minimal modifications, for use in other industrial applications.

• 한국항행학회논문지
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• 제18권5호
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• pp.445-454
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• 2014

본 논문에서는 다목적 디스플레이의 인증 과정에서 수행 했던 시험 중 간접 낙뢰의 영향성을 검증하기 위한 RTCA DO-160 F, Section 22 시험 수행을 위한 대책 설계 내용 및 시험 과정을 소개한다. 낙뢰 유도 전압은 항공기 전기 전자장비의 기능 장애또는 손상을 가져다 주는 데 이것을 낙뢰의 간접영향이라 한다. 이러한 항공기의 낙뢰 간접영향으로부터 항공전자장비를 보호하기 위해서는 항공기에 대한 낙뢰의 영향과 항공기 내부 시스템을 분석하고 해당 부품에 대한 위협 내용에 대한 보호 설계가 필요하다. 본 논문에서는 이와 같은 항공기용 다목적 디스플레이의 낙뢰에 대한 보호를 위하여 대책 수준을 결정을 위한 RTCA DO-160 F, Section 22 category 선정 방법 및 선정된 레벨에 따른 부품 선정 방법 등을 소개한다. 또한 선정된 부품의 설계 유효성을 확인하기 위하여 실제 시험 과정을 소개한다. 이와 같은 각 단계별 과정 소개를 통하여 향후 개발 예정인 항공전자 장비에 대한 낙뢰 대책 설계의 좋은 사례가 될 것으로 예상한다.

• 한국항공우주학회지
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• 제38권5호
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• pp.467-476
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• 2010

본 연구에서는 개념 설계 과정에서 항공 인증 규정 및 의사결정모델을 이용하여 최적화 문제 구성과 항공기 기준형상을 선정하는 프로세스를 정립하고, 이를 소형제트항공기에 적용하였다. 항공기 안전성을 보장하기 위한 최소안전 요구조건인 항공 인증 규정은 항공기 설계 초기단계에서부터 고려되어야 하는 사항으로 반드시 만족해야 한다. 인증 규정 및 사용자 요구도 분석 후, 산업공학기법인 Affinity Diagram, Nested Column Diagram, Quality Function Deployment (QFD), Pugh Concept Selection Matrix와 같은 의사결정모델을 사용하여 alternative 형상군에 대한 평가를 수행하였다. 그 후 Best alternative 형상에 대한 설계가능영역 분석을 통해 항공 인증 규정에 적합하고 객관적인 문제 구성 및 항공기 기준형상을 도출 할 수 있었다.