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통합해석기법을 활용한 공대공 및 지대공 적외선 미사일 대응 초음속 항공기의 중적외선 및 원적외선 신호 분석
김태환,배지열,김태일,정대윤,황창수,조형희,Kim, Taehwan,Bae, Ji-Yeul,Kim, Taeil,Jung, Daeyoon,Hwang, Chang Su,Cho, Hyung Hee 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.6
The stealth performance of supersonic aircraft in recent air battlefield is one of the most significant feature for latest fighters. Especially, as the technology is advancing, the IR stealth capability becomes more important because of its passive characteristic. To design an aircraft with stealth capability, we must know how much the IR signature is generated from the aircraft. Also, predicting the IR signature of enemy's aircraft is tactically crucial. In this study, we calculated MWIR and LWIR infrared signature of $5^{th}$ generation supersonic aircraft against air-to-air and surface-to-air threat using IR simulation code and CFD coupled procedure.
A Study on the Effect on UV Exposure in Coastal Buildings
김태환,어재선,Kim, Taehwan,Uh, Jesun The Korean Society of Disaster Information 2021 한국재난정보학회 논문집 Vol.17 No.2
연구목적: 연안건축 재료의 자외선 반사율과 투과율은 건물의 자외선 방출 및 방출의 주요 요인 중 하나이다. 이 연구에서는 건축 자재의 여러 종류의 자외선 스펙트럼 반사율이 측정되었으며 또한 표면 특성 중에 하나인 명도, 거칠기 및 색도와의 관계에 대해서도 검토 및 제안했다. 연구방법: 본 연구에서는 CIE 분류에 의거하여 자외선영역은 단파장 UV-C (10nm~280nm), 중파장 영역 UV-B (280-315 nm), 장파장 영역 UV-A (315-400nm), 가시광선 영역 (400nm~780nm)으로 정했으며, 연속적으로 측정하기 위하여 분광 광도계를 사용했다. 연구결과: 나무의 경우 반사율은 가시광선역 55-68 %, UV-A <sup>*</sup> 7-12 %, UV-B<sup>*</sup> 4-5 %로 나타났다. 벽타일은 가시광선역 18-40 %, UV-A<sup>*</sup> 8-20 %, UV-B<sup>*</sup> 7-8 % 로 나타났으며, 콘크리트는 가사광선역 37 %, UV-A<sup>*</sup> 28 %, UV-B<sup>*</sup> 19 %로 나타났다. 결론: 가시광선 반사율에 의해 자외선 반사율을 추정 할 수 있으며, 또한 자외선 차단을 할 때에는 용도에 따라 다양한 재료를 선택하는 것이 중요하다. Purpose: The ultraviolet reflectance and transmittance of coastal building materials are one of the important factors of ultraviolet radiation in and out of coastal building. In this research, the ultraviolet spectral reflectance of many kinds of building materials was measured. Also, the relationships with the lightness, roughness, and chromaticity, which are surface characteristics, were reviewed and suggested. Method: In this study, according to the CIE classification, the ultraviolet region was defined as short-wavelength region UV-C(10nm~280nm), medium-wavelength region UV-B (280-315 nm), and long-wavelength region UV-A (315-400nm), and the visible light region was defined as (400nm~780nm). Spectrophotometer was used to continuously measure the reflectance from the ultraviolet region to the visible light region. Results: From the measurement results, the ultraviolet reflectance on Wood was shown to be about Visible 55-68%, UV-A<sup>*</sup> 7-12%, and UV-B 4-5%. Wall tiles are about Visible18-40%, UV-A<sup>*</sup> 8-20%, and UV-B<sup>*</sup> 7-8%. That on concrete was shown to be about Visible 37%, UV-A<sup>*</sup> 28%, and UV-B<sup>*</sup>19%. Conclusion: The ultraviolet reflectance can be estimated by visible reflectance. Also, it is important to select a variety of materials according to the application when blocking UV.
김태환,송지운,차종현,배지열,정대윤,조형희,Kim, Taehwan,Song, Jiwoon,Cha, Jong Hyun,Bae, Ji-Yeul,Jung, Daeyoon,Cho, Hyung Hee 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.4
Infrared(IR) guided heat-seeking missiles uses IR emissions from aircraft to detect and track a target. Due to passive characteristic of the IR guidance, early detection of the missile is difficult and it is significant threat to aircraft survivability. Therefore, IR signature prediction of the aircraft is an important aspect of the stealth technology. In this study, we simulated IR signature of the aircraft in real atmospheric conditions. Aircraft surface temperature distribution was calculated by using RadthermIR code. Based on temperature distribution, IR radiance and BRDF(Bidirectional Reflectance Distribution Function) image were simulated for different weather(seasonal) and background(sky/soil) conditions. The IR contrast tendencies are not aligned with surface temperature or magnitude of target IR radiance. Therefore, it is essential to simulate IR signature with various conditions and background to acquire reliable database.
립 실의 최적화 설계에 따른 접촉력 및 내구성 비교 해석
김태환(Taehwan Kim),김한구(Hangoo Kim),김도현(Dohyun Kim),김청균(Chungkyun Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
This paper presents the numerical results of the the contact force and dulability with optimized design of lip seal. Using the finite element method based on the Mooney-Rivlin model, the contact force and dulability of lip seals were analyzed to illuminate the effect of various shaft interferences and the shape of lip seals. And the optimized design is performed through the Taguchi method. The results show that No.4 model is best model. And the inteference, angle and round is important factors.
김태환(Taehwan Kim),김한구(Hangoo Kim),김도현(Dohyun Kim),김청균(Chungkyun Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
This paper presents the numerical results of the contact force and durability with optimized design of lip seal. Using the finite element method based on the Ogden model, the contact force and durability of lip seals were analyzed to illuminate the effect of various shaft interferences and the shape of lip seals. And the optimized design is performed through the Taguchi method. The results show that No.5 model is the best model. And the interference, angle and displacement(d) is important factors.
SiH₄/H₂ 혼합기체를 Multistep 방식으로 증착한 수소화된 실리콘 박막의 특성 연구
김태환(TAEHWAN KIM),김동현(Dong-Hyun Kim),이호준(Ho-Jun Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.2
In this study, we deposited and investigated μc-Si:H thin films prepared by Plasma Enhanced Chemical Vapor Deposition(PECVD) system. To deposition silicon thin films, we controlled SiH4 gas concentration, RF input power, and heater temperature. According to the experiments, the more SiH4 gas concentration increased, deposition rate also increased but crystalline property decreased at the same conditions. In the RF input power case, deposition rate and crystalline property increased together when the input power increased from 100[W] to 300[W]. If RF input power was 300[W], deposition rate has reached saturation point. In the heater temperature, deposition rate increased when heater temperature increased. Crystalline property maintained a certain level until heater temperature was 250[℃]. And then it was a suddenly increased. Multistep method has been proposed to improve the quality of μc-Si:H thin film. SiH4 gas was injected with a time interval. According to the experiments, crystallite ratio improve about 20~60[%] and photo conductivity increased up to six times.