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이원호,이상룡,Lee, Won-Ho,Lee, Sang-Ryong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
The control model in the tandem cold rolling mill consists of many mathematical theories and is used to calculate the reference values such as the roll gap and the rolling speed for good operation of rolling mill. But, the control model used presently has a problem causing inaccurate prediction of the rolling force. By the parameter identification, it was found that the main factor causing inaccurate prediction of the rolling force was incorrect modeling of the friction coefficient and the flow stress. To get rid of the erroneous factor new adaptive schemes are suggested in this work. Those are a long-time adaptation by the iterative least-square method and a short-time adaptation by the recursive weighted least-square method respectively. The new equations for the friction coefficient and the flow stress are derived by applying the suggested adaptive algorithms. Through the on-line test in an actual mill, it is proved that the rolling force predicted by the new equations is more accurate than the one by the existing equations ever used.
Monte Carlo Simulation on the 4π Field of a View Compact Compton Camera by Using Scintillators
이원호,Ajin Jo,Taewoong Lee,Dongmyeong Chu,Yong Hyun Chung 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
A compact LaCl3(Ce) Compton camera with a 4πfield of view (FOV) was introduced, and the optimized design parameters with the effective choice of the γ-ray interaction order were obtained by using Monte Carlo simulation. The camera consisted of six LaCl3(Ce) planar scintillators with pixelized structure, which could be coupled with position sensitive photomultiplier tubes. Since γ-rays were incident from all direction (4π), all of the scintillators were both scattering and absorbing detectors for Compton image reconstruction, and the interaction sequence was decided based on the deposited energy. According to the simulation results, the reconstructed image showed better angular resolution and smaller variance for all incident radiation energies (300 keV 2 MeV) when the energy of the scattering interaction was assumed to be smaller than that of the absorbing interaction. The optimum thickness of the scintillators to maintain high image resolution and large sensitivity was 1 1.5 cm, and the difference between the center of the camera and the scintillators was set to 7 cm to minimize degradation of image resolution and the loss of detection efficiency. With the optimized conditions, the effect of each parameter causing blurring and variance was estimated. At low energy, the finite energy resolution was the main factor increasing the uncertainties of the reconstructed image. However, at high energy, the pixelization effect and the incorrect choice of interaction sequences also were significant factors in the degraded angular resolution and relative standard deviation of the reconstructed image.
이원호,김진극,Lee, Won-Ho,Kim, Jin-Geuk 한국농공학회 2006 한국농공학회논문집 Vol.48 No.5
The purpose of the study is to determine grid cell of radar relationship, and to promote the radar data on hydrology field. The study region is the Chungjudam basin with a drainage area of $6,648km^{2}$ located within the 260 km circle under the DWSR-88C C-band umbrella(Kwanak Mt Radar). Grid cell was produced to extract radar reflectivity and rainfall data of the same time and point using Arc-view software package. The grid cell size is to estimate mean correlation coefficient for $1km{\times}1km,\;2km{\times}2km,\;3km{\times}3km$ grid. The result of mean correlation coefficient showed good result(0.57) for the $1km{\times}1km$ grid cell. The 32 rainfall stations Z-R relationship was estimated in Chungjudam basin.
이원호,김영재,장기택,이상훈,서광석,김현정,염광원,박창주,Lee, Won-Ho,Kim, Young-Jae,Jang, Ki-Taeg,Lee, Sang-Hoon,Seo, Kwang-Suk,Kim, Hyun-Jeong,Yum, Kwang-Won,Park, Chang-Joo 대한치과마취과학회 2004 Journal of Dental Anesthesia and Pain Medicine Vol.4 No.2
Background: Sevoflurane, a rotatively new inhalational anesthetic. has non-pungent odor and is less reluctant to pediatric patients. The purpose of this study is to examine the feasibility of sevoflurane in inhalational sedation instead of the nitrous oxide for short and simple dental treatments in pediatric patients. Patients and Methods: Fifteen healthy children, whose dental treatment was abandoned due to their little or no cooperation, were selected with their caregivers' written permission. Deep sedation was induced and maintained with oxygen and 1-5% sevoflufane via specially designed nasal mask. Blood pressure, heart rate, oxygen saturation, and electrocardiogram were monitored at 3-nin interval. A dental anesthesiologist, who was independent of dental treatments, was wholly responsible for the sedation procedure. Post-sedation complications and operator's and caregiver's acceptability of this type of inhalational sedation were also investigated. Results: The systolic and diastolic blood pressure, heart rate, and oxygen saturation was significantly depressed during the deep sedation using sevoflurane (P < 0.05). No severe post-sedation complications were found, however, bradycardia was reported in 3 patients. Almost all the operators and caregivers answered that they would adapt this sedation procedure again if possible. Conclusion: In this study, inhalational deep sedation using sevoflurane for dental treatments was found to be very useful. Furthermore, the application of sevoflurane to conscious sedation for pediatric and adult dental patients should be added.
이원호,장은미,이승수,양원직,Yi. Waon-Ho,Chang. Eunmi,Lee. Sungsu,Yang. Won-Jik 한국방재학회 2014 한국방재학회 학술발표대회논문집 Vol.2014 No.1
백두산은 2002년 이후 화산활동 재개 가능성에 대해 주목받고 있는 화산으로서, 지리적으로는 중국과 북한령에 해당하나 실제 화산분화가 이루어질 경우 우리나라는 물론 아시아 지역의 여러 국가에 피해가 있을 것으로 예측되고 있다. 그러나 국내에는 화산 전문가가 부족한 실정이며, 국제적인 활동 및 국제적 네트워크 구축 또한 미비한 상황이지만, 화산재해에 관련된 자료를 확보하여, 백두산이 분화했을 때 국내뿐만 아니라 국제적 공동 대응에 필요한 인접 국가 및 주요 화산중심국들과의 국제협력 체계가 구축되어야 한다. 본 연구에서는 화산재해 국제전문가 참여연구 기반, 국제전문가들이 이용할 수 있는 온라인 네트워크 시스템, 화산재해 국제전문가 네트워크 등의 구축을 위해 참여 연구방안을 수립하고 국제 전문가 참여 연구체계를 구축한다. 본 연구의 기대효과로는 선진 화산재해 대응 기술을 조기 도입할 수 있게 되며, 화산재해 대응기술 분야의 국제적 협력 능력을 높이게 되고, 온라인 네트워크를 통한 해당 분야의 국제 전문가 네트워크를 확보할 수 있다.
동해(東海) 서남해역(西南海域) 식물(植物) 플랑크톤의 현존량(現存量) 분포(分布)와 수온(水瑥)-염분(鹽分) 특성(慝性)
이원호,심재형,Lee, Won Ho,Shim, Jae Hyung The Korean Society of Oceanography 1990 韓國海洋學會誌 Vol.25 No.1
Seawater temperature, salinity, inorganic nutrients and the standing crop of phytoplankton species of the 841 water samples from the upper 125 m at 15-40 stations on the 6 semiannual cruises in the southwestern waters of the East Sea (Korea) were studied during the period from September, 1981 to October, 1984, Among the 235 taxa identified two pennate diatioms, cylindrotheca closterium and Nitzschia delicatissima, were the most common and dominant species. The multiple regression analyses between net phytoplankton abundance (dependent variable) and associated environmental factors(independent variables) were applied to the samples from the surface mixed-layer. In spring the coefficients for the seawater temperature was 1. to 4.2 times greater than those for salinity, while the coefficients for the salinity was 2.1 to 3.4 times greater than those for seawater temperature in autumn. Distribution seawater temperature in spring, and salinity in autumn. Schematically the zone of high standing crops moved about on the T-S diagram in a cyclic manner. The distribution of phytoplankton standing crop was quite closely associated with the hydrographic conditions among various kinds of environmental factors studied.