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신완순,고해석,박병서,강응철,Shin, Wan-Soon,Koh, Hae-Seog,Park, Byung-Suh,Kang, Eung-Cheol 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.5
The purpose of this study is to develop the model to estimate the penetration rate of metal under a high power continuous wave laser irradiation. To estimate it, an empirical modeling is more practical when the penetration phenomena of metal by laser irradiation is too complex to be analyzed by the numerical simulation. When several methods published earlier were applied to our results, we found out that their methods were not appropriate as the model. Therefore, we suggested the new empirical method considering effective intensity as a key variable. As a result, we confirmed that the new method was effective to model the penetration rate of SUS304 metal and expected that it could be available to other metals.
근적외선 연속발진 레이저 조사에 의한 게르마늄 광학창 손상 연구
이광현,신완순,강응철,Lee, Kwang Hyun,Shin, Wan-Soon,Kang, Eung-Cheol 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
The damage in germanium (Ge) optical window irradiated by a near-infrared continuous wave (CW) laser was studied. Laser-induced heating and melting process were surveyed, and the specific laser power and the irradiance time to melt were estimated by numerical simulation. The experiments were also carried out to investigate the macro and micro structure change on Ge window. Results showed that the surface deformation was formed by melting and resolidification process, the damaged surface had a polycrystalline phase, and the transmittance as an optical performance factor in mid-infrared region was decreased. We confirmed that an abnormal polycrystalline phase and surface deformation effect such as hillock formation and roughness increase reduced the transmittance of Ge window and were the damage mechanism of CW laser induced damage on Ge window.
연속발진 레이저에 의한 공기 유동에 노출된 유리섬유 강화 플라스틱 손상효과
이광현,신완순,강응철,Lee, Kwang Hyun,Shin, Wan-Soon,Kang, Eung-Cheol 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.3
We analyzed the damage effect on Glass Fibre Reinforced Plastics(GFRP) under air flow by irradiation of continuous wave near-IR laser. Damage process and temporal temperature distribution were demonstrated and material characteristics were observed with laser intensity, surface flow speed and angle. Surface temperature on GFRP rapidly increased with laser intensity, and the damaged pattern was different with flow characteristics. In case of no flow, penetration on GFRP by burning and flame generation after laser irradiation was appeared at once. GFRP was penetrated by the heat generated from resin ignition. In case of laser irradiation under flow, a flame generated after burning extinguished at once by flow and penetration pattern on GFRP were differently shown with flow angle. From the results, we presented the damage process and its mechanism.
윤성희,장경영,신완순,Yoon, Sunghee,Jhang, Kyung-Young,Shin, Wan-Soon 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.6
EOIS(electro-optical imaging system) is the main target of the laser weapon. Specially, the image sensor will be vulnerable because EOIS focuses the incident laser beam onto the image sensor. Accordingly, the laser-induced damage of the image sensor needs to be identified for the counter-measure against the laser attack. In this study, the laser-induced damage of the CCD image sensor irradiated by the CW(continuous wave) NIR(near infrared) laser was experimentally investigated and mechanisms of those damage occurrences were analyzed. In the experiment, the near infrared CW fiber laser was used as a laser source. As the fluence, which is the product of the irradiance and the irradiation time, increased, the permanent damages such as discoloration and breakdown appeared sequentially. The discoloration occurred when the color filter was damaged and then the breakdown occurred when the photodiode and substrate were damaged. From the experimental results, LIDTs(laser-induced damage thresholds) of damages were roughly determined.
반복적인 펄스레이저 조사에 의한 알루미늄 합금의 표면상태 변화분석
최성호,김정석,장경영,신완순,Choi, Sung-Ho,Kim, Chung-Seok,Jhang, Kyung-Young,Shin, Wan-Soon 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.5
The objective of this study is to investigate the thermal behavior on material surface and the variation in the surface morphology of aluminum 6061 alloy by the Nd:YAG pulsed-laser irradiation. First, we predicted the surface temperature variation during pulsed-laser irradiation by using the two dimensional finite element analysis. When the pulsed-laser of 133 mJ energy and 5 ns pulse duration is irradiated on the surface of aluminum alloy, the material surface is thought to be melting because the surface temperature rises steadily up to about $660^{\circ}C$ exceeding the melting point. Also, the experimental results show that the solidification microstructure has been developed clearly after surface melting. Second, the diameter of melted zone was analysed by finite element analysis and measured by OM(Optical Microscopy). It increased logarithmically with increase in the number of laser irradiation. In addition, AFM(Atomic Force Microscopy) measurement showed an increase in the average surface roughness during pulsed-laser irradiation.
최성호(Sungho Choi),김정석(Chungseok Kim),장경영(Kyung-Young Jhang),신완순(Wan-Soon Shin) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.10
본 연구의 목적은 CW 레이저 조사에 의한 실리콘 웨이퍼의 손상을 평가하는 것이다. 먼저, 레이저 조사에 의한 온도 및 응력 변화를 3 차원 유한요소해석 모델을 이용하여 예측하였다. 해석 결과, 93 W/㎠의 레이저 빔이 조사되었을 때, 실리콘 웨이퍼의 표면의 응력은 약 140 MPa 까지 증가하였으며 균열이 발생할 것으로 예측되었다. 레이저 강도가 더욱 증가하여 186 W/㎠ 일 때에는 실리콘 웨이퍼의 표면의 온도는 1432℃까지 증가하였으며 표면부가 용융될 것으로 예상되었다. 실험 결과, 102 W/㎠ 의 레이저 빔이 실리콘 웨이퍼 표면에 조사되었을 때 표면부에 균열이 발생하였고, 레이저 빔의 강도가 더욱 증가하여 140 W/㎠ 일때 표면부에서 용융이 발생하였다. 용융이 발생하는 레이저 빔의 강도는 유한요소해석 결과보다 낮은 값이었으며 이는 표면부에서 생성된 균열에 의해 레이저 빔의 다중반사와 다중흡수가 일어나 레이저 빔의 흡수량이 증가하였기 때문이다. The objective of this study is to evaluate the thermal damage characterization of a silicon wafer subjected to a CW laser beam. The variation in temperature and stress during laser beam irradiation has been predicted using a three-dimensional numerical model. The simulation results indicate that the specimen might crack when a 93-W/㎠ laser beam is irradiated on the silicon wafer, and surface melting can occur when a 186-W/㎠ laser beam is irradiated on the silicon wafer. In experiments, straight cracks in the [110] direction were observed for a laser irradiance exceeding 102 W/㎠. Furthermore, surface melting was observed for a laser irradiance exceeding 140 W/㎠. The irradiance for surface melting is less than that in the simulation results because multiple reflections and absorption of the laser beam might occur on the surface cracks, increasing the absorbance of the laser beam.
실시간 운영체제 환경에서 IPP 라이브러리를 이용한 잡음이 많고 흐릿한 영상 환경에서 소형 타겟 고속 탐지 알고리즘 구현
김철중(Chuljoong Kim),박병서(Byung-Suh Park),이영철(Young-Cheol Lee),신완순(Wan-Soon Shin) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In order to detect desired targets, it is ideal to create a circumstance with a low noise component of the image and a high signal component of targets. However, it is hard to create a perfect system for an effective image detection. Even if a detection algorithm is developed in a bad circumstance, such as blurred images or images with lots of noise, it is useless in the real time operating system if the computation time is lengthy In this paper, I propose an algorithm that can detect small targets, even if the environmental conditions of th image is very poor. Also, in order to apply the real time operation system, using IPP library designed by Intel Corporation. I propose a high-speed detection algorithm technique that minimizes the computation time of sophisticated algorithm.
고고도 엔진 성능모사를 위한 2차 노즐 목을 갖는 초음속 이젝터의 설계 인자 연구(II)
윤시경(Si-Kyung Yoon),염효원(Hyo-Won Yeom),성홍계(Hong-Gye Sung),신완순(Wan-Soon Shin) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
일정 압력으로 혼합하는 이젝터에서 수축률(Contraction Ratio)로 대변되는 초음속 이젝터 설계 인자에 대한 연구가 수행되었다. 이젝터 설계 인자는 1차 유동과 2차 유동의 질량 유량 비율, 1차 유동 면적과 2차 유동 면적의 비율, 1차 유동의 마하수에 영향을 받는 다는 것을 알 수 있었다. 그리고 특정 작동 조건에 대해 이젝터 유동 가시화 작업을 수행하였다. The effects of design parameters of supersonic ejector system under the assumption of constant pressure mixing; such as mass flow rate ratio, area ratio, Primary mach number on ejector system performance were investigated by theoretical formulations. And for a given design condition and working fluid, Computational Fluid Dynamics was conducted.