쏘일네일링 시스템의 최적설계기법에 관한 연구

黃正淳,黃正奎 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

The 'The Optimum Design of Soil-Naiing System' aims to minimize the construction cost. The Construction cost is affected by many factors like resources, utilities, construction duration etc. However, the total length of the nail(total length of boared hole) is one of the most important factor for the cost of soil-nailing system. So, the total length of nail is chosen as a object function for this optimum problem. In this study, an analytical approach to develop the optimum design technique of soil-nailing system was made. For this purpose the Genetic Algorithm which adopted the Neural Network was used for searching algorithm. Also, the nailed-soil wall displacements expected during the construction stage were taken into account. The nailed-soil wall displacements were predicted by using the Neural Network. In addition, the systemetric disign method of soil-nailing facing element was proposed. Finally, Based on the developed optimum design technique of soil-nailing system, the estimation of importances of various design parameters was made in detail. Also, the optimum design technique was applied in a practical case for the comparison the suggested optimum design method and the ordinary design method. By the comparison the optimum shape of nailing system was proposed for the particular case.

견인용 동기전동기의 시동 및 운전특성 해석에 관한 연구

황정원,조용길,송호신,박한규,우정인 東亞大學校 1994 東亞論叢 Vol.31 No.1

It needs a large capacity of equipments to test the starting performance of middle and large synchronous motors in a factory. This paper propose a new method which is the combination of single phase AC applied test and usual routine test with a small synchronous test machine and testing equipments. We can obtain the results from these proposed tests as follows ; (1) The starting performance and stabilized operation at variable speed is predicted from this results. (2) The armature winding leakage reactance is resulted from the no-load saturation curve, the short-circuit charactristic curve and the armature-reaction magnetomotive force converted to the field current. (3) This test must be performed twice, one for short-circuiting the field winding, the other for joining a resistance between the field terminals, as a result the unknown constants in equivalent circuits are identified. (4) Inverter-fed three phase voltage with variable frequency is applied to armature terminals, as a result, We show the actual armature leakage reactance and reaction of the induced harmonic voltages from rotor.

말뚝의 動的 支持力 및 杭打應力에 관한 硏究

黃正奎 弘益大學校 1989 弘大論叢 Vol.21 No.2

This paper proposes practical method which can provides field engineers with reliable and convenient analytical procedures for the determination of load carrying capacity of piles and for the prediction of driving stresses along the full length of pile. The comparison indicates the newly proposed equations are as reliable as any other formula of this kind which have been known highly reliable, and also as the numerical method by the wave equation.

점증하중시 Sand Drain에 의한 압밀해석

黃正奎,金正瓚 弘益大學校 1988 弘大論叢 Vol.20 No.2

R.A. Barron has developed a theory on the consolidation by radial flow to drain wells under an instantaneous load condition. In this paper some formulas which were derived from the Barron's and Olson's theories are presented and observed in order to obtain more reasonable and practical solution of consolidation by sand drains with the peripheral smear zone and well resistance under consideration of a ramp load condition.

HELP Model을 이용한 매립지 침출수 발생량 예측

정규호,서상원,황선진 경희대학교 환경연구소 2001 環境硏究 論文集 Vol.10 No.-

Estimation of landfill leachate generation is main issue that determain leachate collection system and scale of disposal system. Other reason is indirect estimation of damage of collection, drainage and disposal system for generation difference and control. The subject of this study is that Sudogwon landfill site #1 is landfill closure site. Actual leachate start 493 m^(3)/day at Jan. 1993 and maintain 5,000∼7,000 m^(3)/day after 1997. The other side estimation from HELP Model is 3,000∼6,000 m^(3)/day for same period. But concerned with condensation water and compression by increased layers, historical actual leachate geneation and estimation from HELP Model are similar.

축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향

정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.

지진의 영향을 고려한 영팽창선이론에 의한 얕은기초의 지지력해석

黃正奎,申東勳 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-

The present study was made based on the zero extension line theory and the seismic coefficient method to determine the seismic bearing capacity of shallow foundation. The zero extension line theory, which was proposed by Roscoe et al., presumes the coincidence between the loci of failure and the zero extension lines in soil mass. In order to compute the seismic bearing capacity of shallow foundation with smooth base mobilized by an earthquake, it was assumed that subsoils beneath the foundation are dense and cohesionless sandy soils, there are no changes in soil parameters during earthquake, and only horizontal earthquake intensity is considered. The presented theories were successfully compared with the conventional bearing capacity theories. And the effects of embedment depth of footing, earthquake intensity, dilation angle and internal friction angle of soil, on the bearing capacity factors were analysed. Finally a simplified formula for bearing capacity factor of N?? in earthquake was also provided.

R. Cantillon, F. Quesnay 및 A. Smith의 이윤개념에 대한 비교 연구

황규선,정향교 釜山 大學校 經營 經濟 硏究所 1995 經營 經濟 硏究 Vol.14 No.1

본 논문에서는 스미스 이전 시대에 논의되었던 이윤의 개념, 그 중에서도 스미스의 이론 형성에 많은 영향을 미친 깡띠옹과 케네의 이론체계 내에서 이윤이 어떻게 이해되었는가를 분석할 것이다. 그리고 더 나아가 이들의 이윤개념이 어떠한 연관성을 가지고 스미스의 이윤개념으로 발전되어 가는가를 살펴볼 것이다. 이런 방법으로 논의를 전개함에 있어서 그 촛점은 물론 이들 세 사람의 이윤개념의 차이에 주어질 것이지만 이것은 단순히 각자의 이론체계에 있어서의 한 부분에 대한 연구에 그치는 것이 아니다. 왜냐하면 자본의 이윤을 어떻게 파악할 것인가 하는 것은 특히 정치경제학의 경우에 있어서는 전체이론의 성격을 규정하는 결정적인 잣대가 되기 때문이다.

개별요소법에 의한 보강토옹벽의 안정해석

황정규,김화주 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

The use of geosynthetics as a reinforcing element for reinforced earth retaining structures has been recently increased in view of its low cost, light weight and good durability. With fabrics, however, large strains may frequently be induced, it is essential, therefore, to assess the strains likely to be induced. In this paper an analytical procedure based on Chang's discrete element method for stability analysis of reinforced soil retaining wall is presented to predict displacements of geosynthetics. For the stability analysis of geosynthetic reinforced soil retaining wall, nonlinear behavior of the reinforcement is simulated by using hyperbolic model. Furthermore, the maximum reinforcement tension in any reinforcement layer has been estimated by modifying the method proposed by Duncan et al.(1980,1986), Ehrlich & Mitchell(1994)

퍼지논리를 이용한 자기 주도적 학습 능력과 시험 능력 평가 방법

정회인,양황규,김광백 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.2

본 논문에서는 학습자 스스로가 학습 능력을 조절하고 학습 능력과 시험 능력을 객관적으로 판단할 수 있는 자기 주도적 학습 능력 및 시험 능력 평가 방법을 제안하였다. 제안된 자기 주도적 학습 능력 및 시험 능력 평가 방법은 삼각형 타입의 소속 함수와 퍼지 논리를 이용하여 학습 능력과 시험 능력의 소속도를 계산하고 각각에 대해 퍼지 등급도를 부여하였다. 학습 능력의 소속도와 시험 능력의 소속도에 대해서 퍼지 관계의 연산 및 합성에 의해 최종 소속도를 계산하고 퍼지 등급도를 결정하여 삭습자가 학습 능력의 소속도와 시험 능력의 소속도 및 최종 퍼지 등급도를 분석하여 스스로 학습을 조정할 수 있도록 하였다. 그리고 제안된 연구 내용을 인터넷 정보 검색사 필기 과목에 적용하여 구현하였다. In this thesis, We propose the self-directed learning and test-performing abilities assessment method to evaluate the learning and the test-performing abilities in which learners can not only control their own learning abilities for themselves, but also judge objectively learning and test-performing abilities. This method shows the membership degree of learning and test-performing abilities by using both the triangle-type membership function and the fuzzy logic. In addition, it gives the fuzzy grades to each item. The final membership degrees are calculated and the fuzzy grades are decided by the operation and composition of fuzzy relations on the membership degrees of learning and test-performing abilities. In this method, which is applicable to a writing subject for information searchers, learners are asked to analyse the membership degrees of the learning and test-performing abilities and the final fuzzy grades and to adjust a learning process for themselves.