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閔悳基 울산대학교 1984 연구논문집 Vol.15 No.1
Downhole Method를 利用하여 彈性波의 速度를 測定하였다. 本 論文에서는 剪斷波의 測定에 重點을 두었으며, Cross Correlation을 利用하여 測定한 結果와도 比較 分析하였고, Poission 比도 計算하였다. In this paper, in-situ elastic wane velocity was measured by the downhole seismic method. In the analysis of the test, special emphases are given to the identification of the shear wave. The results of the analysis show that the cross correlation signal analysis reaches the same result as the instantaneous time analysis. And the Poisson's ratio is also estimated by the wave velocity.
민덕기,최규환 울산대학교 2001 공학연구논문집 Vol.32 No.1
일반적으로 점성토의 압밀계수는 하중단계마다 일차압밀이 100% 완료되기까지 충분한 재하시간(24h)을 필요로 하는 표준압밀시험을 통해서 구할 수 있다. 하지만, 표준압밀시험으로는 간극수압을 직접 측정하기가 어렵고, 압밀완료시간이 최소한 1주일 이상이 소요된다. 따라서, 신뢰성 있는 값을 확보하면서 신속한 압밀시험 방법의 개발이 요구된다. 본 연구에서는 Inflection Point Method(Francis R. Cour 1971)[2]를 이용하여 신속히 압밀계수를 구하는 Rapid Inflection Point Method에 대한 연구를 수행하였다. 본 연구의 결과로 얻어진 압밀계수는 Taylor방법, Casagrande방법, Rectangular Hyperbolar방법으로 구한 압밀계수와 비교하였고[1], Rapid Rectangular Hyperbolar(A. Sridharan 등, 1999)방법[8]으로 구한 압밀계수와 비교·분석하여 그 적용성을 검토하였다. 또한, 본 연구를 통해서 압밀시간 단축에 관한 타당성을 입증하였다. This study presented the new method for evaluating the coefficient of consolidation by using inflection point method which was based on the fact that time factor, T corresponding to the inflection point of a semilogarithmic plot of a time curve is fixed and equals to T = 0.405 at 70% consolidation. In the proposed method, the next load increment is applied as soon as the necessary time reqaired to identify the inflection point. Thus, the coefficient of consolidation may be easily evaluated. The time required to complete the testing using this rapid consolidation method could be as low as 1∼5 hours compared with 1 or 2 weeks in the case of the conventional consolidation test. Keyword : consolidation, inflection point, rapid consolidation method
민덕기,허영미,조상래 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Structural damages of ice class ship side structure have been collected through the survey of literature and simulated by means of nonlinear structural analysis to estimate the loads causing those damages. The estimated loads have been compared to those which were performed by other researchers. Ranki's formula for transverse framing system and Hayward's formula for longitudinal framing system nearly agree with the estimated loads. Also, differences in structural damages at room temperature and low temperature were evaluated from the viewpoint of structural strength and cost in case D grade high tensile steel is employed instead of A grade mild steel. From this study, it is noticed that damages can be minimized at minimal cost if D grade high tensile steel is applied to ice class ship side structures instead of A grade mild steel only within ice belt zone of ice class ship.
민덕기,이종성,강기원,박기헌 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
In this study, a linearized model for the BTT missile which is used in designing a linear controller is derived. Since we know only the information on the resulting equations of a linearized model for the existing BTT missile, it is very difficult to design an actual controller. The method proposed in this study allows a linear controller to be designed in the specific operating point by defining aerodynamic variables numerically which have been conceptually used so far and deriving a linearized model.