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다단 혼 형태의 초음파 장비를 이용한 초음파 화학적 효과 연구
최종복,이성은,손영규,Choi, Jongbok,Lee, Seongeun,Son, Younggyu 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.4
Since the typical horn-type ultrasonic equipment induces a reaction at the probe tip, the sonochemical reaction has a limitation that it occurs only in a specific area. As one of the ways to overcome this limitation, an ultrasonic device with multi-stepped horn equipped with several oscillators has been developed. The objective of this study was to investigate the sonochemical effects induced by acoustic cavitation system in 20 kHz multi-stepped ultrasonic horn using calorimetry, KI dosimetry and the luminol test. The sonochemical effects of multi-stepped ultrasonic horn were compared with that of the typical horn-type 20 kHz ultrasonic device. The effect of immersion depth and power on the sonochemical reaction was investigated in the ultrasonic system with multi-stepped ultrasonic horn. Higher calorimetric energy was obtained at higher immersion depth and power conditions. Sonochemical effects increased significantly when using the high immersion depth and input power. However, as the input power increased, the cavitation reaction zone concentrated around the ultrasonic horn. Additionally, the experiments to examine the effect of liquid temperature was conducted. The smaller sonochemical reaction was obtained for the higher liquid temperature. The effect on temperature seems to be closely related to liquid conditions such as viscosity and vapor pressure of water.
경부고속철도 운행구간의 전차선로와 표정속도 향상에 대한 연구
안영훈(Younghoon Ahn),최종복(Jongbok Choi),박현웅(Hyungwoong Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
With the opening of 1st phase and 2nd phase in Gyeongbu High Speed Line KTX(The Korea Train Express) and Sancheon(2nd generation of High Speed Train) are operating commercially on entire line. Gyeongbu High Speed Line can be separated as several sections. In this entire line a few types of train has operating by it's own pattern. However commercial speed of the line compared with the maximum speed of Train is rather slow. Through this study I found the reason of the slow speed on the Catenary system and suggested a solution.