자발성 뇌실내출혈 환자에서 임상적 -전산화단층촬영상소견의 상관관계

황선철,김범태,장재칠,주교성,신원한,최순관,변박장 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.6

직류 서보 전동기의 가변구조 위치제어

임선종,김낙교 건국대학교 산업기술연구원 1994 건국기술연구논문지 Vol.19 No.-

Position control is a classical problem with various industrial application. Proportion-integral-derivative(PID) feedback control is perhaps the most common control design used by industry. But PID control is difficult to gain low overshoot, and also it is hard to compensate nonlinearity such as backlash. So, variable structure system(VSS) is one of the useful theories to constrain overshoot, and rise time. The VSS system transforms its structure by switching. Then, the state trajectory slide along the switching line to the phase-plane origin. The phase trajectory is known as the sliding mode. The main feature of VSS is that it has the so-called sliding mode on the switching surface. Within the sliding mode, the system remains insensitive to parameter variations and disturbances and its trajectories lie in the switching surface. In this paper, the position control of a DC servo motor in the sliding mode was performed, proposed the algorithm of variable structure control and analysed the insensitivity of the system with parameter variations and disturbance in the sliding mode. Experimental results indicated that VSS controller constrained overshoot and rise time of the system response.

수용액에서 γ형 알루미나 표면에 대한 니켈이온(Ⅱ)의 흡착특성

홍교민,김문선,정재관 한국공업화학회 2003 공업화학 Vol.14 No.3

γ형 알루미나의 흡착특성을 구명하기 위하여 본 실험에서는 수용액에서 γ형 알루미나를 흡착제로 이용하여 온도와 pH가 니켈이온(Ⅱ)의 흡착능에 미치는 영향을 관찰하고 알루미나 표면과 니켈이온(Ⅱ) 간의 Langmuir와 Freundlich 흡착등온식과 Lagergren 흡착속도식을 결정했다. 5 g Al_2O_3/L의 조건에서 니켈이온은 10 h에 흡착평형상태에 도달했다. PH 2~6의 범위에서 pH가 증가할 때 흡착량은 급격히 증가하다가 PH 6에서 최대 흡착량을 나타냈으며 pH 6~9의 범위에서는 pH가 증가하여도 흡착량은 일정했다. 온도 20℃에서는 흡착량이 적었으나 30℃에서 급격히 흡착량이 증가하였으며 30~50 ℃의 범위에서는 온도 증가에 따라 흡착량이 완만하게 증가했다. Freundlich 흡착등온식의 결정계수는 0.9489로 Langmuir식의 0.9265보다 높았으며 Lagersen 흡착속도식에서의 k_ad값은 0.0023 h^-1으로 결정계수는 0.9497이였다. In this paper, Langmuir and Freundlich adsorption isotherms, and Lagergen adsorption rate were determined and the effect of temperature and pH on the adsorptivity of Ni(Ⅱ) ions were investigated in order t() stud)'the adsorption characteristics of γ-type alumina. For 5 g Al_2O_3/L, the adsorption equilibrium was obtained in 10 h. The adsorption amount increased rapidly when pH incrteased from 2 to 6, and the maximum adsorption amount was observed at pH 6. For pH 6 to 9, however, the adsorption amount remained constant. The adsorption amount was low at 20℃. However, The adsorption amount increased with increased in temperature; the amount increased rapidly at 30℃ and increased linearly with temperature from 30 to 50℃. The correlation coefficient (R_2) for Freundlich adsorption isotherm was 039489%, and this was higher than that for Langmuir adsorption isotherm of 0.9268%. The adsorption coefficient (k_ad) of lagergen equation was 0.0023h^-1, and the correlation coefficient (R^2) was 0.9497.

CO_2 초임계 유체/전도성 에멀젼용액을 이용한 구리판에 대한 니켈 나노도금에 관한 연구

홍교민,홍성철,김문선,정재관 한국공업화학회 2002 응용화학 Vol.6 No.2

In this study, experiments of a nickel elecroplating were performed by a conductive emulsion solution of CO_2/electrolyte/surfactant/entrainer in the supercritical nanoplating system to investigate the effect of the resistivity on plating properties. Resistivity values decreased 60, 35, and 22 Ω at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20 Ω. Surface properties of nickel film electroplated by the emulsion solution with 60 wt% electrolyte at 8 MPa was better than that at atmospheric pressure.

凝集工程에 의한 染色廢水處理

姜善泰,徐承敎,權五億 대구산업정보대학 1990 논문집 Vol.4 No.-

This study was performed determine optimum condition for the coagulation treatment process in dye wastewater. The results are summarized as follow; 1. The effective pH for dye wastewater treatment using Al₂(SO₄)₃, FeC1₃, FeSO₄ in coagulation process were 6.0, 5.0, 10.0, respectively. 2. The optimum dosage for dye wastewater treatment using Al₂(SO₄)₃, FeC1₃, FeSO₄ in coagulation process were 800㎎/ℓ, 700㎎/ℓ, 700㎎/ℓ, respectively.

새로운 LacZ Gene Fusion 및 Gene Cartridge Vector의 개발에 관한 연구

박교선,이영훈,박충웅,최창진 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

In this study, a new lacZ gene vector, plasmid PGEM3-lacZ was constucted, which could be used for the study of the gene regulation and the function of proteins. Plasmid pMC1871 was digested with restriction endonuclease Pst I and Sma I to obtain a DNA fragment with the lacZ-gene(3091 bp). Recombinant plasmid pGEM3-lacZ was constructed by inserting the lacZ gene DNA(Pst I-Sma I cut DNA; 3091 bp) of pMC1871 into the Pst I and Hinc Ⅱ sites of plasmid pGEM3. After then, Recombinant plasmid pGEM3-lacZ DNA was transformated into E. coli HB 101. pGEM3-lacZ DNA/HB 101 was screened on the NZY plate with ampicillin and X-gal(5-Bromo-4-Chloro-3-Indolyl-β-D-Galactoside) by selecting blue colonies. The restriction map of pGEM.3-1acZ DNA was constructed by the following restriction enzymes :Bgl I, Xbal I, Bam HI, EcoR I, Hind Ⅲ, Kpn I, Pst I, Sma Ⅰ, Sal Ⅰ. From the restriction map, the lacZ DNA was confirmed to be present at the expected position in the plasmid pGEM3-lacZ. pGEM3-lacZ/HB101 gives about 10 times more lacZ DNA than pMC 1871/HB101.

사과주 제조에 있어서의 성분변화

서승교,강선태 대구산업정보대학 1989 논문집 Vol.3 No.-

By the difference of a preparation process in Apple wine making, increase and decrease of methanol content was studied. 1) Formation of methanol during fermentation was increased during 24-48hrs. 2) The contents of methanol after fermentation were orderly D>E>F>A>C>B. 3) Heat treatment and SO₂ addition are to decrease amounts of methanol 4) Pectinase treatment: and maceration produced high level of methanol.

중학교 가정 교과 수행평가 방법 및 도구 개발

박선영,조필교,이양심,윤인경,임양순,최창숙,장명희 한국 가정과 교육 학회 1998 한국가정과교육학회지 Vol.10 No.2

The purpose of the study is to develop a Performance Assessment Method & Tools for Home Economics at middle school. Through the content analyses of middle school Home Economics curriculum and 8 textbooks of lst, 2nd, and 3rd grade respectively, teching elements for each content area were drawn and each specific learning objectives were idntified accordingly. In addition, assessment element for student's performance in each teaching element were specified for analysis. Analytic framework for the development of Performance Assessment Method and Tools were proposed by each teaching element. Beased on the analytic framework proposed, a model method and tools were developed by 10 different test measures of description written test, statement written test, oral test, pro and con discussion, performance test, experiment, interview, observation, self-test report, and portfolio. The model proposed in the study has been modified and improved through the feasibility studies of experts' examination and field research application. The model assessment method and tools for the study has been compleeted finally by proposing 45 performance assessment tools for the content areas of food, clothing, housing, resource management and consumerism, human development and family relationship.

스포츠센터 경영자의 리더 유형에 따른 직원의 직무만족 차이

이보선, 김교준, 오준석 용인대학교 체육과학연구소 2000 體育科學硏究論叢 Vol.10 No.1

The Purpose of this study were to examine the difference related with the job satisfaction about Spouts Center Workers according to the sports Center Manager leader's type. The Subjects in this study were 293 Sport Center Works who were selected by random sampling form 10 sports center, among 23 in Kyonggi province. The content of the questionnaire used for this research was made up, the reliability and appropriateness of the questionnaire was confirmed based on pilot study, a meeting of specialists, a calculation of Cronbach's α value used analytic technique. In order to analyze the data, this study used a SPSS/WIN Version 9.0 program for statistical analysis, and was completed using frequencies, t - test, oneway ANOVA, correlation analysis and multiple regression analysis, etc. The follows are the conclusion of this study based on the above studying method, process, and data analyzing. First, as for the difference of job satisfaction according to sports center worker's social background, showed the difference in terms of sex, education and career. Second, as for the difference of job satisfaction according to the leader type in sports center manager, showed the difference task directivity and harmony directivity, but no remarkable difference in the aspect of bureaucratic directivity.

정상인에서 베타3-아드레날린 수용체 유전자의 변이가 복부 비만도 및 지질대사에 미치는 영향

김영선,윤석기,김철희,서교일,김학선,김극배,변동원,유명희 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.1

The β₃-adrenergic receptor is expressed in visceral adipose tissue in humans and is thought to contribute to the regulation of the resting metabolic rate and lipolysis. We studied the influence of a mutation in the β₃ -adrenergic receptor gene(Trp64Arg) on body fat distribution, central obesity, lipid metabolism in 65 healthy young male adults. One out of 65 subjects were homozygous (Arg/Arg) for the trp64Arg mutation, 17 subjects were heterozygous (Trp/Arg), and 47 lacked the mutation(Trp/Trp). The body weight, height, body mass index, waist-to-hip ratio were similar between the subjects with- and without the mutation. Total body fat, abdominal fat amount, body fat distribution, serum total- and HDL-cholesterol, triglyceride, glucose, and insulin concentrations were also not different according to the presence or absence of the mutation. These results suggested that Trp64Arg mutation in β₃-adrenergic receptor gene is not a major contributing factor for central obesity or change in lipid metabolism in Korean young adults.