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방사형 자기장 내의 전기도금된 평면코일을 이용한 전자기형 마이크로 액추에이터
류지철,강태구,조영호,Ryu, Ji-Cheol,Gang, Tae-Gu,Jo, Yeong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.1
This paper presents an electromagnetic microactuator using the copper coil electroplated on the p+silicon diaphragm. The microactuator generates a vertical motion of the diaphragm using the radial direction, we propose a new actuator structure with twin magnets. The microactuator field in the radial direction, we propose a new actuator structure with twin magnets. The microactator shows a values of resonant frequency and quality factor in the ranges of 10.51${\pm}$0.22kHz and 46.6${\pm}$3.3, respectively. The twin magnet microactuator generates the maximum peak-to-peak amplitude of 4.4$\mu\textrm{m}$ for the AC rms current of 26.8mA, showing 2.4 times larger amplitude than the single magnet microactuator.
류지철,김영균,권정남,Ryu, Ji-Cheol,Kim, Young-Kyun,Kwon, Jung-Nam 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.3
After a gastrectomy, various forms of postgastrectomy syndrome may happen, such as dumping syndrome, reflux $^{\wedge}esophagitis$, afferent loop syndrome, marginal ulcer, anemia, etc. These can cause some problems in the quality of life for post-gastrectomy patients. This oriental medicine treatment was designed to improve digestion and relieve symptoms, correct imbalance and prevent relapse in each case. This study suggests a level of efficacy of oriental medicine(Samryungbaekchul-san, Bobi-tang) in treating postgastrectomy syndrome.
류지철,Ryu, Ji-Cheol 대한석유협회 1996 석유와 에너지 Vol.1996 No.8
이 자료는 지난 7월 5일 한전 소강당에서 열린 한국에너지협의회ㆍ에너지경제연구원 공동 세미나에서 발표된 내용을 옮긴 것이다. <편집자 주>
SWAT HRU Mapping module을 이용한 해안면 만대천 유역의 토지이용별 지하수 함양량 평가
류지철 ( Ji Chul Ryu ),최재완 ( Jae Wan Choi ),강현우 ( Hyun Woo Kang ),금동혁 ( Dong Hyuk Kum ),신동석 ( Dong Suk Shin ),이기환 ( Ki Hwan Lee ),정교철 ( Gyo Cheol Jeong ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.5
The hydrologic models, capable of simulating groundwater recharge for long-term period and effects on it of crops management in the agricultural areas, have been used to compute groundwater recharge in the agricultural fields. Among these models, the Soil and Water Assessment Tool (SWAT) has been widely used because it could interpret hydrologic conditions for the long time considering effects of weather condition, land uses, and soil. However the SWAT model couldn`t represent the spatial information of Hydrologic Response Unit (HRU), the SWAT HRU mapping module was developed in 2010. With this capability, it is possible to assume and analyze spatio-temporal groundwater recharge. In this study, groundwater recharge of rate for various crops in the Mandae stream watershed was estimated using SWAT HRU Mapping module, which can simulate spato-temporal recharge rate. As a result of this study, Coefficient of determination (R2) and Nash-Sutcliffe model efficiency (NSE) for flow calibration were 0.80 and 0.72, respectively, and monthly groundwater recharge of Mandae watershed in Haean-myeon was 381.24 mm/year. It was 28% of total precipitation in 2009. Groundwater recharge rate was 73.54 mm/month and 73.58 mm/month for July and August 2009, which is approximately 18 times of groundwater recharge rate for December 2009. The groundwater recharges for each month through the year were varying. The groundwater recharge was smaller in the spring and winter seasons, relatively. So, it is necessary to enforce proper management of groundwater recharge during droughty season. Also, the SWAT HRU Mapping module could show the result of groundwater recharge as a GIS map and analyze spatio-temporal groundwater recharge. So, this method, proposed in this study, would be quite useful to make groundwater management plans at agriculture-dominant watershed.
Shock-Tube Study of the Oxidation of Acetaldehyde at High Temperature
원석재,류지철,배준현,김윤도,강준길,Won, Seok Jae,Ryu, Ji Cheol,Bae, Jun Hyeon,Kim, Yun Do,Gang, Jun Gil Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.5
The combustion characteristics of a mixture of acetaldehyde, oxygen and argon behind a reflected shock wave at temperatures ranging from 1320 to 1897 K at 100 torr were studied. The emission from the OH radical at 306.4 nm and the pressure profile behind the reflected shock were measured to monitor ignition delay time. The ignition delay times were computed from a proposed mechanism of 110 elementary reactions involving 34 species. The simulation and sensitivity analysis confirm that the main channel for oxidation of acetaldehyde at high temperature consists of the Rice-herzfeld mechanism, the decomposition and oxidation of HCO, and the reaction of H with $O_2$.