위장관 전체에서 발생한 Cronkhite-Canada 증후군 증례

박웅채,오미희,박의우,김상윤,서정민,박재갑 대한대장항문학회 1992 Annals of Coloproctolgy Vol.8 No.2

용접순서와 자중이 용접변형에 미치는 영향에 관한 연구

박정웅,강재완 朝鮮大學校 建設技術硏究所 2005 建設技術硏究 Vol.25 No.1

Welding deformations are affected by various factors. This research investigates effects of welding sequence and self-weight on welding deformation. According to the results by equivalence load method, magnitude of welding deformation with self-weight is about twice one without self-weight on parallel weld path component. But welding deformation with the components used in this research are not affected by welding sequence

판재에 있는 구멍 또는 이종재료 사이에서의 크랙 전파 거동

조재웅,한문식 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

This study investigates the behavior of fatigue crack propagating between holes or holes filled with another materials. When holes or the holes bonded with another materials exist near center crack symmetrically, crack propagation rate is influenced by the bonding force of brazing part and the elastic modulus ratio of another material to matrix. It is experimentally and analytically confirmed that the center crack stops when its tip reaches near the center line of the holes and a small crack is initiated from the boundaries of holes or the holes filled with another materials and it propagates to final fracture. The mechanical behaviors of center crack near another materials are also investigated.

분무건조법을 이용한 방출 제어형 케토로락 고형지질마이크로스피어의 제제설계

윤재남,이은미,김동우,박용근,전일순,이계원,지웅길 충남대학교 약학대학 의약품개발연구소 2003 藥學論文集 Vol.18 No.-

Ketorolac (KA) and ketorolac tromethamine (KT) is the nonsteroidal anti-inflammatory drugs (NSAIDs) and has been used widely. To improve its frequent administration by control of drug release. we prepared SLM of KA and KT using Mirj 45 and 52 as surfactants and tripalmitin and tristearin as lipids by spry drying method SLM, as a disperse system for injection, were evaluated by measurement of particle sizes. SEM and drug release pattern As a result. spherical SLM were prepared and their particle size were in the range of 25-125 μm, which were dependant on the types and contents of lipid and sururfactants. Their dissolution rate were decreased as increasing lipid contents.

우리나라 河川의 形態學的 特性과 流出

高在雄 建國大學校 附設 産業技術硏究所 1992 논문집 Vol.17 No.-

The morphological characteristics and main channel bed slopes are evaluated. The main result of correlation between catchment area and main stream length in Korea is good agreement with given by Eagleson(1970). The flow resistance equations available for this purpose are Mannings and Chezy formula and those are reformed using geometry of main channel cross sections. Energy slopes for the conditions of design flood are expressed in the functions of river length. Data from Naktong and Geum River are used to derive the standardized design width of the each cross sections. The coefficient of river characteristics are defined to compute the discharge and also the width of the design flood for the purpose of higher accuracy of the formula. This approximation could be used to the design width of the river based on morphological and geometrical characteristics of the river system.

韓國河川의 洪水特性에 관한 硏究

高在雄,文濟吉 건국대학교 1979 學術誌 Vol.23 No.2

This study presents the hydrological and statistical Analysis of the flood charateristics in Korean Rivers. The area selected for study were Han, Naktong, Geum, Yeongsan, and Seomjin River. Twenty four gauging stations in the rivers were selected for the analysis of the basin max. daily rainfall and food peak discharge records. The purpose of this study was to set up the accurate way of estimating the frequency of the max. daily rainfall and flood peak discharge of the basin. The following five methods of the rainfall frequency analysis were applied to each station; 2 parameter lognormal, 3 parameter lognormal, Type I extremal (Gumbel method), Pearson Type III, and log-Pearson Type III. The regression equations were established between the depth of max. daily rainfall given any reccurrence interval and the basin area. Three methods of flow frequency analysis currently in common use were applied in this study, the Hazen, Type I extremal, and log-Pearson Type III. The three methods involved not only the computation of the statistics appropriate to the distributions, but alto the relating of these statistics to basin and climatologic characteristics. Methods for regional analysis were used for this study to compare the results of regional flood frequency made by three methods and appraises the relative reliability of these methods. The correlation graph and the dimensionless flood frequency curves are the end products of this analysis. On the basis of the regional study of the rainfall frequency and the flood frequency, the following conclusions were reached : (1)The larger the basin area are the less the depth of rainfall for same recurrence interval based upon the results of the rainfall frequency analysis of the max. daily rainfall in the basins. (2)There are no significant differences between each basin in rainfall depth for same recurrence interval. Derivation of the depth of indicated recurrence interval are estimated as follows : P100 = 725A-0.140 P50 = 595A-0.128 P20 = 415A-0.114 P10 = 355A-0.101 P5 = 280A-0.093 P2 = 150A-0.056 (3)Three parameter lognormal is the best fits probability function for the frequency analysis of the max. daily rainfall statistics in Korean Rivers. (4)Combining records for all stations in a hydrologically homogeneous area tends to reduce the sampling error associated with a non representative sample. The results of the regional flood frequency study provides the meaningful yardsticks for determining the design flood. (5)The mean annual flood, defined as the discharge corresponding to a recurrence intervall of 2.33 years are each correlated with basin and climatologic parameters in the homogeneous region. Only drainage area was the statistically significant parameter. Regression equations for Q2.33 are obtained as follows. Han River Basin : Q2.33=5.53A0.772 Naktong River Basin : Q2.33=43.16A0.492 Geum River Basin : Q2.33=20.28A0.593 Yeongsan and Seomjin : Q2.33=1.36A0.972 (6)The most remarkable results pointed out in this study is the coincidence of the regional flood frequency curves for the five river basins. This means that the whole Korean Rivers have the hydrologically homogeneity. (7)Advantages of the regional flood frequency relation and max. daily rainfall frequency derivation in thin study are that those relation can be applied to ungaged sites in the region wherever.

壓電 motor의 驅動回路에 관한 연구

朴在雄 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.2

ABSTRACTIn the solenoid-operated actuator, there are a lot of problems of consumed electrical power, heating, electric-magnetic noise, etcBut, it is difficult to solve and improve there problems.This paper presents an analysis of torgue characteristic of piezo electric motor, which is driven by the designed driving circuits.Also, the driving waveform is discussed. In the solenoid-operated actuator, there are a lot of problems of consumed electrical power, heating, electric-magnetic noise, etc. But, it is difficult to solve and improve there problems. This paper presents an analysis of torque characteristic of piezo electric motor, which is driven by the designed driving circuits. Also, the driving waveform is discussed.

2관성 공진계를 갖는 직류 서보 전동기의 진동억제 제어에 관한 연구

박재웅 한밭대학교 산업과학기술연구소 1994 논문집 Vol.2 No.-

A motor system consists of two inertia resornant system connected a large inertial moment and elastic shaft. In this paper, A surpression of oscillation in resornant system with two inertial is studied. Especially, the experimental results using the Digital Signal Processing in abailable for applying to load to demand rapid response.

Multiple Controller를 사용한 Active Structural Control

金在雄 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2

A problem of considerable current in structural engineering is the design of active control system for architectural and civil engineering structures. Automatic active structural control was recently recommended as one technique that, if use properly, would provide safety and serviceability for a megastructure and at the same time guarantee human comfort. The closed-loop control provides active damping and active stiffness needed to control the structure against any unexpected disturbance and also against the influnce of uncertain structural parameters. However, there are many problems left to be investigated, e. g. optimal location and number of controller and observer, model reduction problem, optimal control device with respect to energy requirement, etc. ……. In this paper, control effects with the various location of controller and the placement of new poles are shown so that the favorable control law is to be found.

한국산 꽃무릇의 Allelopathy 효과 구명

박재현,이인중,신동현,김길웅 慶北大學校農業科學技術硏究所 2002 慶北大農學誌 Vol.20 No.-

1. 꽃무릇으로부터 용매를 다르게 하여 잎과 인경의 MeOH와 수용추출물을 bioassay 한 결과, 농도가 5% 및 10%로 증가하였을 때는 전혀 발아되지 않았으며, 1%에서는 근장이 크게억제되었다. 용매간의 추출효과에는 차이가 없었으나, 상추의 생장에서는 인경추출액이 잎추출액보다 억제효과가 다소 높은 것으로 보였다. 2. 꽃무릇의 인경을 추출하여 UV를 조사하였을 때 Rf 0.49-0.52에서 보인 spot는 GC-MS에 의해 Iycoris alkaloid계통의 Iycorenan으로 동정되었다. This study was conducted to investigate allelopathic potential from Korean Lycoris radiata HERB. Two different solvents such as MeOH and water were used for extraction from Lycoris radiata HERB. Both extract showed inhibitory effect on the germination of barnyardgrass and lettuce seeds, indicating that this species contained the biologically active substances. The inhibitory substance extracted from bulbs of this species was identified by GC-MS as lycorenan, a kind of alkaloid.