Four Poems by Hwang Dong-kyu

Hwang Dong-kyu,Kim U-ch’ang(번역자) The Academy of Korean Studies 1967 Korea Journal Vol.7 No.1

족과관절염좌 환자에 대한 동씨침법과 일반침법의 효과에 대한 비교 연구

안호진,정동화,황규선,윤기붕,김태우,문장혁,백종엽,이상무,Ahn, Ho-jin,Jeong, Dong-hwa,Hwang, Kyu-seon,Yoon, Ki-bung,Kim, Tae-woo,Moon, Jang-huyk,Baek, Jong-yeob,Lee, Sang-moo 대한침구의학회 2003 대한침구의학회지 Vol.20 No.1

Objective: The purpose of this study is to compare the effects of Dong-si acupuncture therapy and General acupuncture therapy for the patients with acute ankle sprain. Methods : This study has been carried out for 60 cases of ankle sprain patients who have visited Dong-Seo Oriental medical Hospital from May 1, 2002 to September 30, 2002. We have treated 30 cases of them by Dong-si acupuncture therapy and the other 30 cases by General acupuncture therapy. And we have compared those two group. Results : 1. There was no significant difference at the treatment period and the number of treatment times in comparing two groups. 2. The number of treatment times for good effect is that : Dong-si took $1.57{\pm}0.85$ times and General acupuncture therapy took $2.15{\pm}0.96$ times. And we have found that the effect of Dong-si acupuncture therapy is faster than the other.

유압 모터 시스템에 대한 극점 배치 제어

황규동,이창훈,조영돈,김도석 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

Pole Placement Control has been well establish in its theory. However, its practice value is yet to be appreciated in most industries. This paper presents an account in which the control strategy is run on the hydraulic motor. Using the input and output data from actual system, estimation of the model parameters are obtained by a function ARMAX(Autoregressive Moving Average with am exogenous signal) in Matlab and controller synthesis is achieved by a Pole placement control. Estimation system from a ARMAX is defined by third order and application of Pole placement control technique will be provide not only stability but also good performance for motion of hydraulic motor in any operation condition.

유압 밸브 - 모터 시스템에 대한 H_(∞) 제어

황규동 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

This study describes a hydraulic fluid property compensator under the various perating conditions. Because hydraulic fluid systems have much more excellent features than other control systems, they are used in many fields. However, the characteristics of hydraulic fluid are changed due to various operating conditions. This phenomenon is called uncertainty. Especially, bulk modulus is considered as the most dominant parameter in this study Under the wide range of temperature and pressure, bulk modulus is changed. In order to overcome the uncertainty, H_(∞) technique will be used for this study. Spectral factorization, model matching problem and controller parametrization are also applied to achieve the desired robust control action. Designed controller using the H_(∞) technique, is adopted for the hydraulic fluid valve motor system.

일부 제조업 사업장의 작업환경실태 및 특수건강진단에 대한 조사 연구

황주성,황규윤,안규동,이병국 순천향대학교 산업의학연구소 1997 순천향산업의학 Vol.3 No.1

The purpose of this study was to obtain information on the working environment, rate of environmental measurement over TLVs, the number of workers who were exposed to hazardous agents and, the examined rate of special health examination(SHE) in different types of industries. Authors investigate the reports on the working environmental status of the 101 industries in Cheonan area and result of SHE of those industries. The results were as follows : 1. Out of 101 industries under study, only 54 industries took special health examination. 2. While 85.3%(6,590) of 7,726 workers working in 101 industries were exposed to one or more hazardous agents, 88.4% of 5,867 workers working in 54 industries with special health examination were exposed to those agents & 75..4% of 1,859 workers working in 47 industries without any special health examination were exposed to those agents. But according to the criteria of selecting eligible workers for special health examination, only 32%(1,935/5,867) of total workers in the later industries were classified as eligible for the special health examination. 3. While rate of environment measurement of 101 industries TLVs who 25.5%, that of 54 industries with SHE was 29.8 & that of 47 industries without SHE was 16.1%, while the rate of noise and dust measurement over TLVs of 54 industries with SHE was 31.7%, and 25.3%, those of 47 industries without SHE was 13.6% & 35.6%, among 54 industries with SHE the rate of environmental measurement over TLVs was highest in clothes & leathers(47.0%) and that of foods(32.3%) and primary metal(31.3%). One the other hand, among 47 industries without SHE the rate of environmental measurement over TLVs was highest in paper & printing(44.9%) and that primary metal(15.8%), metaloid mineral(15.5%). 4. The examined rate of SHE of 54 industries was 92.7% as a whole. By type of industries the rate of primary metal(221.4%), foods(181.7%), chemicals(120.4%) were exceeded expected percent(100%) but the rate of metalloid mineral(53.0%), paper & printing(63.8%), machinery(72.2%) were far below the expected percent. 5. Only 4.7% of total workers working in 47 industries without SHE were classified as eligible workers for SHE. Among those eligible workers 48.9% were belonged to potential workers for SHE of noise. 6. The response rate of questionnaire was 70.4%(38/54) in 54 industries wirh SHE & 48.9%(23/47) in 47 industries. The necessity of environment measure was positively answer in 81.6% of 38 with SHE & 87% of 23 without SHE. On the other hand, the necessity of SHE was positively answered in 68.4% with SHE & 21.7% without SHE.

고속전철 추진 시스템의 미끄럼 방지 제어기법에 관한 연구

황돈하,김동희,노채균,심광열,조규판,정원영 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2

Induction motor drive with PWM inverter control has been developed for Korean High Speed Railways. To improve traction performance, the anti-slip control(ASC) to recover adhesion must be considered. This paper describes a novel hybrid anti-slip control method for the induction motor drive. By introducing the vector control for drive system, quick response of the motor torque can be achieved when wheels are going to slip. A hybrid control scheme by mixing two conventional control methods (slip velocity feedback control and slip detection pattern control) for wheel slip and re-adhesion is proposed. This control method is simulated by motor drive, train load, and friction-creep models. The train running simulation results based on induction motor vector control with PWM inverter show that good re-adhesion characteristics are obtained.

비선형 구조물의 수치최적화 알고리즘에 관한 연구

황규동 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1

It is frequently confronted with the problems which need to minimize or to maximize the arbitrary function values, satisfying certain limited conditions in engineering design as well as in economics and basic sciences. In order to solve these, first, it is necessary to know quantitatively how the design parameters to determine are related with the confronted problem, and then to make them to minimize and to express the limited condition to a numerical equation. Second, it is necessary to determine the optimized design parameters to satisfy the limited condition utilizing an optimization technique for the analysed problems. It is focused on the development of simple program which can effectively perform the optimization process by inputting minimum data using general personal computer in this study, regardless of that whether object function and the limited condition equation are linear or not.

납노출지표와 적혈구내 protein kinase C 활성도의 연관성

황규윤,황보영,안현철,김용배,리갑수,이성수,안규동,이병국 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.4

목적 : Protein kinase C는 칼슘-인지질 의존형인산화 효소로 'H VJ'tfO에서 납에 의하여 활성화되지만, 납에 노출된 인체내에서 그 영향을 평가한 경우는 얼다. 본 연구의 목적은 납에 직업적으로 노출되는 근로자를 대상으로 납 노출이 적혈구막의 단백질내에서 PKC 활성에 의한 인산화 수준에 영향을 주는지 알아보고자 하였다. 방법 : 1998년부터 국내 납 근로자를 대상으로 납에 의한 건강 영향조사가 4년간의 코호트 연구로 실행하였다. 1차년도에 630명의 납 근로자와 135명의대조군이 조사되었고 이들중 본 연구에서는 직업적노출이 되는 사업장에 근무하는 212명의 근로자를대상하였다. 156명의 남자와 56명의 여자 근로자를 대상으로 인구학적, 과거병력, 직업력 등을 구조화된 설문과 면접으로 조사되었고 납 노출 평가는 혈중 납농도 및 ZPP, 경골중 납농도를 측정하였다. PKC의 활성도는 적혈구막 단백질내 PKC 의존형인산화 수준으로 평가하였다. 적혈구막 단백질인spectrin과 band 4.9의 후인산화수준을 측정하여각 납 노출지표(혈중 납, ZPP, 경골중 납. 노출기간)와의 관련성은 다중회귀분석을 이용하였다. 결과 : 조사대상자의 평균(SD) 연령은39.1(10.0)세, 근무기간은 8.1(6.5)년 이었으며, 경골중 납농도는 범위가 0.8에서 290.8 trg Pb/gbone mineral로 평근(SD) 34.4(35.2) rig Pb/gbone mineral이었다. 적혈구막 단백질의 후인산화수준은 개인간 변이가 매우 컸으며, spectrin은 평균(SD) 540 7(304.1), band 4.9 SfkDa는198.6(78.2), 48 kDa는 247.7(83.3) PSL이었다.경골중 납농도와 노출 기간은 이들 후인산화 수준과역상관성을 보였으나(p(0.05), 혈중 납 농도와 ZPP는 상관성이 없었다(p)0.05). 가능성 있는 혼란변수를 통제한 상태에서도 경골중 납 농도와 노출기간은 이들 후인산화수준과 유의한 회귀계수를 나타내었다. 결론 : 만성적 납 노출에 의하여 적혈구내 PKC활성도는 영향을 받아 증가되어있는 것으로 평가되어 적혈구막 단백질의 인산화수준은 납의 노출지표로 이용될 수 있을 것이다. 납의 신경독성은 부분적으로 PKC의 활성도왁 관련되어 있을 기전을 배제하기 어렵기 때문에 PfC 활성도와 신경행동학적 기능과의 관련성 평가가 진행되어야 할 것이다. Objectives : Protein kinase C(PKC) , a calcium and phospholipid dependent enzyme, is activated by lead in vitro at picomolar concentrations. However, the effect of lead on PKC has never been studied in a human population. The purpose of the study was to evaluate whether lead exposure was associated with PKC mediated-phosphorylation in erythrocytes among lead workers. Methods : Two hundred and twelve lead workers were studied. To determine the levels of phosphorylation ir vivo, an in vivo back phosphorylation technique was used by adding PKC and γ-32P to preparations of erythrocyte membranes. We measured back phosphorylations of erythrocyte membrane proteins, spectrin, and 52 kDa and 48 kDa, as an indirect measure of PKC activation if vivo. Results : The mean(SD) age and exposure duration was 39.1(10.0) years and 8.1(6.5) years, respectively. Tibial lead ranged from 0.8 to 290.8 μg Pb/g bone mineral with a mean (SD) of 34.4(35.2) μg Pb/g bone mineral. The means(SD) of back phosphorylation levels of the three proteins were 540.7(304.1), 198.6(78.2), and 247.7(83.3) photostimulated luminescence units (PSL), respectively, by phosphoimager. After adjustment for potential confounding factors, tibial lead and exposure duration were significantly and inversely associated with back phosphorylation levels. One unit of increase in tibial lead (1 μg Pb/g bone mineral) is associated with a decline in spectrin, band 4.9 52 kDa, and band 4.9 48 kDa back phosphorylation levels by 1.4(p〈0.05), 0.34(p〈0.05), and 0.47(p〈0.01), respectively However, there were no associations between the back phosphorylation levels and either blood lead or ZPP levels. Conclusions : These findings suggest that the PKC activity in erythrocytes is increased by chronic lead exposure and that erythrocyte membrane protein phosphorylation may be a biomarker of lead exposure.

기계시스템의 최적설계를 위한 플랙시블 허용오차법의 수정

黃圭東 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.1

Numerical optimization techniques are proper methods for obtaining resonable and reliable solution to the mechanical design problem. In this study, the numerical optimization program for microcomputer is developed using the modified flexible tolerance method. It was found that the modified flexible tolerance method was effective for solving problems with equality constraint condition. software package for microcomputer was developed for optimum design of engineering systems.

機械시스템의 最高設計를 爲한 數値最適化 方法에 關한 硏究

黃圭東 忠州大學校 1987 한국교통대학교 논문집 Vol.21 No.-

Numerical optimization is a useful tool for obtaining reasonable solutions to the engineering design problems. In this paper,numerical optimization program for microcomputer was developed using modified feasible direction method. The results obtained by the modified feasible direction method are compared with those by the feasible direction method. Modified method converges rapidly to the optimum value without zigzaging behavior, while feasible direction method has a tendency of zigaging between constraint boundaries.