• 항공우주시스템공학회지
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• 제9권2호
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• pp.63-71
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• 2015

An aircraft engine is considered as the most important element among aircraft systems. Thus type certificate is required for an aircraft engine to ensure its safety under appropriate airworthiness standard. U.S. FAR Part 33 or European CS-E is widely adopted as an airworthiness standard for aircraft engines, and other representative countries of the world established own airworthiness standards under their regulations. In this paper, we compared differences of the requirements between FAR Part 33 and CS-E, and proposed the rulemaking items to harmonize Korean Airworthiness Standard for Aircraft Engines with worldwide standards and to contribute to growth of aviation industry.

• 한국기계가공학회지
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• 제6권3호
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• pp.92-97
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• 2007

The overlay welding the automobile where the durability is demanded, it is used in the vessel engine valve, plant valve and pump parts. Cause of damage public opinion one what is thought is the fatigue load due to the opening and shutting operation right time repetition of the engine valve. The damage cause of the engine valve or explanation of destruction mechanism is very difficult. The research which it sees to make clear a overlay welding of Co-alloy by Plasma Transferred Arc Weld Surfacing Process reconsideration fatigue crack initiation and fatigue crack growth mechanism at high temperature.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 제2회 학술대회 논문집 일렉트렛트 및 응용기술전문연구회
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• pp.1-8
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• 2000

Automotive electronics as we know it today encompasses a wide variety of devices and systems. Key to them all, and those yet to come. is the ability to sense and measure accurately automotive control parameters. In other words, sensors and actuators are the heart of any automotive electronics application. The important of sensors and actuators cannot be overemphasized. The future growth of automotive electronics is arguably more dependent on sufficiently accurate and low-cost sensors and actuators than on computers, controls, displays, and other technologies. Without them, all of controls system - engine. transmission. cruise, braking, traction, suspension, steering, lighting, windshield wipers, air conditioner/hearter - would not be possible. Those controls, of course, are key to car operation and they have made cars over the years more drivable, safe, and reliable. In this lecture, the principle and future trends of electronic control gasoline engine will be discuss.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 1995년도 제4회 학술강연회논문집
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• pp.71-81
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• 1995

The Propulsion System Integration can be defined as the optimization technology of combining the propulsion system components with the airframe to achieve the overall aircraft misson performance goals. The disposition of propulsion system components on engine compartment enveloped by front fuselage and fire bulkhead is very restricted because of the interference with nose L/G and engine mountig strut. The design of components depends on the traditional technical data base. The engine satisfying a customer's ROC was selected among worldwide existing engines by the comparision studies of performance analysis with enigine installed effect, future growth potential, ILS, and application to aircrafts, etc. The ground test of the propulsion system integration was performed in the test cell and on the aircraft to assure the function of the components. The flight test was performed to confirm complying the performance requirements.

• 반도체디스플레이기술학회지
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• 제20권4호
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• pp.96-101
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• 2021

The SLAM market is growing rapidly with advances in Machine Learning, Drones, Augmented Reality technologies. However, due to the absence of an open source-based SLAM library for developing AR content, most SLAM researchers are required to conduct their own research and development to customize SLAM. In this paper, we propose an opensource-based Mobile Markerless AR System by building our own pipeline based on Visual SLAM. To implement the Mobile AR System of this paper, it uses ORB-SLAM3 and Unity Engine and We experimented with running our system in a real environment and confirming it in the Unity Engine's Mobile Viewer. Through this experimentation, we can verify that the Unity Engine and the SLAM System are tightly integrated and communicate smoothly. Also, we expect to accelerate the growth of SLAM technology through this research.

• 에너지공학
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• 제23권1호
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• pp.75-80
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• 2014

지난 최근 몇 년 동안 내연기관 엔진의 여러 가지 타입의 성능, 효율, 배기가스 특성을 잘 설명해 줄 수 있는 흥미있는 수학적인 모델이 다양하게 제시되고 있다. 이러한 다양한 양상의 엔진 작동의 모의실험에 있어서 주요한 요소가 엔진 연소 과정의 모델이다. 연소모델은 주로 세 가지 분류로 세분화 되어지고 있다. 즉, 제로 차원적, 유사 차원적, 다차원 모델로 나눌 수 있다. 제로 차원모델은 열역학 제1법칙에 근거하여 만들어졌고, 시간은 단지 독립 변수이다. 본 연구는 제로 차원 모델에 의하여 스파크 점화 기관의 연소 특성을 제시하려는 그 목적이 있다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.51-55
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• 2003

In this research, authors tried to measure the shape of the nozzle throat of KL-3 engines, which is the main engine of KSR-III rocket, to find the increase of nozzle area caused by the thermal ablation. For the purpose, we invented an image-based method instead of the 3D pointer, which is actually inaccessible to such large scale engines. As a result, our equipment showed satisfactory accuracy and performance. Analysing the results of experiments, we find that the pattern of ablation is determined by the spray pattern and that the process of thermal ablation phenomena can be categorized in three regimes - the first regime that the shape of nozzle throat is maintained and ablation is negligible, the second regime that saw-tooth form is developed and ablation is accelerated, and the third regime that the saw-tooth form is already established and the growth of ablation rate is reduced. Also, we find that the ratio of area increase after 60 seconds combustion is +5.82% and conclude that this figure is acceptable and satisfactory.

• 대한기계학회논문집B
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• 제25권12호
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• pp.1692-1701
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• 2001

This study describes the combustion characteristics under various condition of air excess ratio and ignition timing in a 2-valve SI optically accessible engine with swirl control valve(SCV). It adapted three different types of SCV(open ratio 72.5%, 78%, 59%) to strengthen a swirl flow. Pressure data were acquired using pressure sensor to investigate the effect of swirl flow on combustion, and from these pressure data, IMEP(indicated mean effective pressure) and MFB(mass fraction burnt) were calculated to explain burn rate and flame speed. From acquired flame images, we inspected the flame propagation direction, flame area, and flame centroid. Flame propagation direction showed different tendency between with/without SCV, and flame area with SCV was faster and larger than that of conventional engine. Finally, the representative flame images at each crank angle were acquired by PDF method to verify flame growth process. It is found that strengthened swirl flow is more beneficial for faster and stable combustion.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.188-193
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• 2017

미국과 유럽은 대형 항공기 산업을 선도하고 있으며, 아시아-태평양 지역에서는 물동량이 증가하면서 운송산업과 정비산업이 크게 발전할 것으로 전망된다. 또한, 일본과 중국은 중소형 항공기 분야에서 설계 제작국에 진입하였으며, 후발국가의 정비산업도 경쟁이 더욱 가속되고 있다. 향후 10년간 세계의 항공기 정비산업은 연평균 3.4%로 성장하고, 엔진 정비산업은 7%씩 성장할 것으로 전망된다. 본 논문을 통하여 고부가가치를 창출할 수 있는 기술집약형 항공엔진 정비산업 육성 방안을 제시하고자 한다.

• 한국추진공학회지
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• 제22권4호
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• pp.117-124
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• 2018

미국과 유럽은 대형 항공기 산업을 선도하고 있으며, 아시아-태평양 지역에서는 물동량이 증가하면서 운송산업과 정비산업이 크게 발전할 것으로 전망된다. 또한, 일본과 중국은 중소형 항공기 분야에서 설계 제작국에 진입하였으며, 후발국가의 정비산업도 경쟁이 더욱 가속되고 있다. 향후 10년간 세계의 항공기 정비산업은 연평균 3.4%로 성장하고, 엔진 정비산업은 7%씩 성장할 것으로 전망된다. 본 논문을 통하여 고부가가치를 창출할 수 있는 기술집약형 항공엔진 정비산업 육성 방안을 제시하고자 한다.