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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.
열차 특성을 고려한 효율적인 속도 프로파일 생성에 관한 연구
박철홍(Chul-Hong Park),김정태(Jungtai Kim),백종현(Jong-Hyen Baek),최현영(Hyeon-Yeong Choi),장동의(Dong-Eui Chang) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.11
It is one of the major objectives in the train operation to drive a train in time while minimizing its energy consumption. For this reason, studies on efficient use of energy in the railroad system have been continuously conducted. The acceleration and deceleration operations on a train are performed by controlling the notches, so the notch level should be considered in the train operation. Furthermore, the conventional dynamic model of a train is usually described as a function of time whereas the rail constraints are defined as functions of displacement. Hence, a dynamic model of the train in terms of the displacement variable is needed in order to conveniently reflect the rail constraints. In this study, such a dynamic model is set up with the notch features taken into account, and an energy-related optimization problem is formulated in terms of the displacement variable. By solving the optimization problem, an efficient speed profile is produced. A simulation is also performed to verify the performance.