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김진범(Jinbeom Kim),나석주(Suckjoo Na),장원석(Wonseok Chang),김재구(Jaegoo Kim),최무진(Moojin Choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this work, a study on the energy distribution of short pulses at near field was performed for nano-scale processing. The finite-difference-time-domain (FDTD) method was employed to simulate the energy distribution in near field. The simulation was executed for NSOM tip with aperture and femto-second laser (λ=800㎚). The simulation results show that the energy distribution is a function of the tapered angle, the diameter of the aperture and the coating material of the tip. The intensity of laser energy behind the aperture decreases exponentially with increasing distance from the aperture, while the full width at half maximum is also expanded.
김진범(Jinbeom Kim),황석환(Sekhwan Hwang),정진철(Jinchul Chung) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The HRSG is the equipment to recover energy from flue gas of gas turbine. The inside components of HRSG are faced with high speed and temperature flue gas discharged from the gas turbine. HRSG bumpers are installed to protect heat exchange tube bank from flue gas. However, bumpers are damaged by flow induced vibration of flue gas in some cases. In this study, we analyzed flow behaviors near HRSG bumper through computational fluid dynamics with LES, and then extracted PSD data from CFD results. Consequentially, the life of HRSG bumper was predicted through using these PSD data on bumper.
김진범 ( Jinbeom Kim ),송문빈 ( Moonvin Song ),정연모 ( Yunmo Chung ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
IPsec(Internet Protocol Security protocol)에서는 기본적으로 4개의 암호 알고리즘(3-DES, AES, MD5, SHA-1)을 사용하고 있다. 본 논문은 4개의 암호 알고리즘을 효율적으로 통합 및 하드웨어로 설계하였으며 검증하였다. 그 결과 알고리즘을 각각 합친 경우보다 하드웨어에서의 크기를 줄일 수 있다.