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비접촉식 화학작용제 탐지용 라만 분광계를 위한 Denoising Autoencoder 기반 잡음제거 기술
이창식,유형근,박재현,김휘민,박동조,장동의,남현우,Lee, Chang Sik,Yu, Hyeong-Geun,Park, Jae-Hyeon,Kim, Whimin,Park, Dong-Jo,Chang, Dong Eui,Nam, Hyunwoo 한국군사과학기술학회 2021 한국군사과학기술학회지 Vol.24 No.4
Raman spectrometers are studied and developed for the military purposes because of their nondestructive inspection capability to capture unique spectral features induced by molecular structures of colorless and odorless chemical warfare agents(CWAs) in any phase. Raman spectrometers often suffer from random noise caused by their detector inherent noise, background signal, etc. Thus, reducing the random noise in a measured Raman spectrum can help detection algorithms to find spectral features of CWAs and effectively detect them. In this paper, we propose a denoising autoencoder for Raman spectra with a loss function for sample efficient learning using noisy dataset. We conduct experiments to compare its effect on the measured spectra and detection performance with several existing noise reduction algorithms. The experimental results show that the denoising autoencoder is the most effective noise reduction algorithm among existing noise reduction algorithms for Raman spectrum based standoff detection of CWAs.
가솔린 인젝터의 연료 분무 미립화 특성에 미치는 분사 압력의 영향
이창식,최수천,김민규,권상일,Lee, Chang-Sik,Choi, Soo-Chon,Kim, Min-Kyu,Kwon, Sang-Il 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4
This paper describes the macroscopic behavior and atomization characteristics of the high-pressure gasoline injector in direct-injection gasoline engine. The global spray behavior of fuel injector was visualized by shadowgraph technique. The atomization characteristics of gasoline spray such as mean diameter and mean velocity of droplet were measured by the phase Doppler particle analyzer system. In order to obtain the influence of fuel injection pressure, the macroscopic visualization and experiment of particle measurement on the fuel spray were investigated at 3,5 and 7 MPa of injection pressure under different surrounding pressure in the spray chamber. The results of this work show that the fuel injection pressure of gasoline injector in GDl engine has influence upon the mean droplet diameter, mean velocity of spray droplet, the spray tip penetration, and spray width under the elevated ambient pressure.