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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.
Mediating effect of growth mindset and grit between human rights victimization and self-esteem
이창식,박지영,난제 바코마 다니엘,실비아 엔곤데,아쿠네 페이쓰,메디키 어거스틴 에보카,마 엔수메 파멜라,Lee, Chang Seek,Park, Ji Young,Daniel, Nanje Bakoma,Ngonde, Sylvia,Faith, Akunne,Eboka, Mediki Augustine,Pamella, Ma Nsume The Society of Digital Policy and Management 2017 디지털융복합연구 Vol.15 No.9
본 연구는 인권피해와 자아존중감의 관계에서 성장 마인드셋과 그릿의 매개효과를 검증하는데 목적이 있다. 자료는 임의표집한 대학생 233명을 대상으로 설문으로 수집하였으며, 자료 분석을 위하여 신뢰도 분석, 상관 분석 및 Macro Process을 수행하였고, 성장 마인드셋과 그릿의 매개효과를 검증하기 위하여 부트스트랩 방법을 사용하였다. 연구결과는 다음과 같다. 첫째, 인권피해는 자아존중감, 성장 마인드셋, 그릿과 유의미한 부적 상관관계가 있는 반면, 자아존중감은 성장 마인드셋 및 그릿과 정적 상관관계가 있었다. 둘째, Macro Process를 이용한 경로분석 결과 인권피해는 자아존중감, 성장 마인드셋 및 그릿에 부적 영향을 미쳤다. 반면에 성장 마인드셋과 그릿은 자아존중감에 정적인 영향을 미쳤다. 셋째, 성장 마인드셋과 그릿은 인권피해와 자아존중감과의 관계에서 매개효과가 있었다. 이러한 결과는 인권 피해를 당한 대학생들의 자아존중감이 성장 마인드셋과 그릿을 증가시킴으로써 향상될 수 있음을 시사하였다. Our current study aimed to verify the mediating effect of growth mindset and grit in the relationship between human rights victimization and self-esteem. The survey was conducted on 233 college students. Reliability analysis, correlation analysis, and Macro Process were performed, and bootstrap method was used to verify the mediating effect of growth mindset and grit. The results were as follows. First, human right victimization were significantly and negatively correlated with self-esteem, growth mindset, and grit while self-esteem were significantly and positively correlated with growth mindset, and grit. Second, as a result of path analysis, the human rights victimization had a significant negative impact on self-esteem, growth mindset and grit. On the other hand, growth mindset and grit had a significant positive effect on self-esteem. Third, growth mindset and grit had a mediating effect in the relationship between human right victimization and self-esteem. This implied that self-esteem of college students can be increased by increasing their growth mindset and grit. Future research is needed to clarify the role of human rights research and growth mindset and self - esteem in college students.
입자 추적법을 이용한 4 밸브 가솔린 기관의 실린더 내 텀블 유동 특성
이창식,전문수,정성환,Lee, Chang-sik,Chon, Mun-soo,Chung, Sung-hwan 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.9
The in-cylinder flow field of gasoline engine comprises unsteady compressible turbulent flows caused by the intake port, combustion chamber geometry and the change of the spatial shape. Thus the quantitative analysis of the in-cylinder bulk flow plays an important role in the improvement of engine performances and the reduction of exhaust emission. The influences of tumble intensifying valve (TIV) and swirl intensifying valve (SIV), and various intake-flow conditions are compared with the tumble ratio obtained by the measured results of the in-cylinder gas flow. In order to obtain the quantitative analysis of the in-cylinder gas flows of gasoline engine this investigation applied the particle tracking method to the analysis of gas flow characteristics. Various intake conditions such as tumble and swirl intensifying valve, the deactivated condition of one valve among two intake valves, and the other factors of gas flow are considered.