• 대한한의학원전학회지
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• 제21권1호
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• pp.79-92
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• 2008

Objective The analysis method based on the herbal formula's effects is a general tool, in traditional medicine. In effective applications of herbal formula, Korean herbal medicines traditionally used the classification methods based on the curative effects through the various compositions of herbal formulas. However' the effects of herbal formulas were not filed systemically in ancient literatures, and the standards to confirm their effects are not clear. Thus, it is not easy to classify herbal formulas according to the curative effects. Furthermore, there are no standards to estimate the effects of prescriptions frequently directed in clinic. In this study, we aimed to provide the methodology of classifying the curative effects of herbal formulas by calculating the combination of the effect of each compositional herb through the DB systems. Results : By comparing effects of herbal formula with those of compositional herbs, we found that about 25-50% of the herbal effects were included in herbal formula's effects. These results showed that the prospective estimation of herbal formula's effects may be possible through the DB systems filing herbal effects. To enhance the accuracy in explaining the herbal formula's effect, more studies are needed by giving prominence to major effects and by subtracting minor effects.

• 대한한의학방제학회지
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• 제27권1호
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• pp.65-71
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• 2019

Objective : This study aims to diversify interpretation of formulas from "Onbyungjobyun" by analyzing various formulas from "Onbyungjobyun" as basic formulas. Method : This study found herbal communities of combination by analyzing herbal combinations based on network analysis of formulas from "Onbyungjobyun", and has analyzed each community of combination as basic formulas. Result : The results of network analysis showed a total of 3 herbal communities of combination; first was medicinal herbs from Eungyo-san(銀翹散), Jeungaek-tang(增液湯), Bokmaek-tang(復脈湯), Gyeji-tang(桂枝湯), Sogeonjung-tang (小建中湯) series; second was medicinal herbs from Angungwoohwang-hwan(安宮牛黃丸); third was medicinal herbs from Baekho-tang(白虎湯), Jaseol-dan(紫雪丹), Sayeok-tang(四逆湯) series. Conclusion : The formulas from "Onbyungjobyun" are consisted of herbal communities of combination; that treat warm-heat pathogen and supplies yin essence or yang qi; treat reverse transmission to the pericardium(逆傳心包); and treat heat in the qi phase in Onbyeong and cold-dampness in the middle energizer.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.686-689
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• 2005

A numerical simulation method is developed to analyze the dynamic response of a cantilever switch, which is driven by electrostatic force and a basic component of electro-mechanical coupled system. First, point-charges model on conductor is proposed as a lumped parameter of electrical part. Then, this model is easily incorporated into a multi-body dynamics analysis algorithm, the generalized recursive dynamics formula previously developed by our research group. The resulting motion of a coupled overall system is formulated as a differential algebraic equation form including electrical and mechanical variables together. The equation is simultaneously solved in every time step. To implement this approach into the useful dynamics analysis tool, we used multibody dynamics software (RecurDyn) based on the generalized recursive formula using relative coordinate. The developed numerical simulation tool is evaluated by applying to many different driving condition and switch configuration. The final analysis model will be added to RecurDyn as a basic module for dynamics analysis of electro-mechanical coupled system.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1998년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Spring 1998
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• pp.85-92
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• 1998

As an analytical approach, the area reduction formula of rubber bearings has been proposed to account for the reduction in bucking load due to shear. The result obtained from the formula is presumed to be conservative but the degree of conservatism is unknown. This paper describes a numerical study which aims at determining the effect of high shear strain on the critical load of rubber bearings using a finite element analysis program. The results from the finite element analysis which accounts for both the material and geometric non-linearities are compared against the theoretical results in order to examine the validity of the theoretical formulas.

• Wind and Structures
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• 제8권1호
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• pp.1-12
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• 2005

A simplified analysis able to point out the most relevant geometrical and aerodynamic parameters that can influence the flutter of long span modern bridges is the aim of the paper. With this goal, by using a continuous model of the suspension bridge and by a quasi stationary approach, a simple formula of the combined vertical/torsional flutter wind speed is given. A good agreement is obtained comparing the predictions from the proposed formula with the flutter speeds of three modern suspension or cable stayed bridges: the Great Belt East Bridge, the Akashi and Normandie bridges. The paper ends with some comments and comparisons with the well known Selberg formula.

• 한국전산구조공학회논문집
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• 제25권3호
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• pp.245-258
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• 2012

압출공법(incremental launching method)은 교대 배후에 거더 제작장소를 설치하고, 콘크리트를 이어쳐서 교량거더를 제작하고, 이것을 잭(jack)으로 밀어내는 가설방법이다. 이 공법에 의해 시공되는 교량의 상부단면은 시공 중에 지간의 중앙부와 지점부에 일시적이나마 모두 위치하게 된다. 따라서 단면들은 자중에 의해 발생되는 최대 정모멘트와 최대 부모멘트, 그리고 최대 전단력을 모두 경험하게 되는 구조적 특성을 가지고 있다. 한편 거더의 캔틸레버 작용을 감소시키기 위하여 거더의 선단에 압출추진코(launching nose)를 부착시킨다. 이때 상부단면에 발생하는 일시적인 응력의 크기는 압출추진코의 단면특성에 따라 달라진다. 이 연구에서는 압출추진코와 상부단면의 상호작용에 관한 해석식의 정확성을 유지하고, 활용도를 높이기 위해서 압출추진코를 유사등단면(강성;등단면, 중량;변단면)으로 가정하여 단순화된 해석식을 제안하였고, 압출추진코의 단면이 등단면으로 가정한 기존 해석식의 정확성을 향상시키기 위해서 다이아프램의 중량을 집중하중으로 치환시켜 변형된 등단면 해석식을 제안하였다. 그리고 제안된 2개의 해석식의 정확성과 활용성을 판단하기 위해 실제 ILM 교량 설계자료들을 통해 전산구조해석 프로그램과, 기존 해석식들과 비교 분석하였다.

• 대한기계학회논문집A
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• 제41권1호
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• pp.7-11
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• 2017

본 논문은 등방성 재료로 된 반 무한 평판에 존재하는 반 무한 균열에서 엄밀해를 구성하여 응력확대계수를 계산하였다. H. Tada, P. Paris, G. Irwin의 "The Stress Analysis of Cracks Handbook"에 수록된 공식과 Bueckner의 공식에 엄밀해로부터 구한 균열 면에 작용하는 표면력을 적용하여 응력확대계수를 계산하였다. Bueckner의 공식은 엄밀해와 일치하였고 Tada의 Handbook에 수록된 공식은 엄밀해와 일치하지 않았다. 따라서 Tada의 공식이 오류임을 알 수 있다.

• 한국수학교육학회지시리즈A:수학교육
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• 제45권3호
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• pp.367-373
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• 2006

This study suggests that it is necessary to prove that the values of three areas of a triangle, which are obtained by the multiplication of the respective base and its corresponding height, are the same. It also seeks to deeply understand the meaning of Area formula of triangles by exploring some questions raised in the analysis of the proof. Area formula of triangles expresses the invariance of congruence and additivity on one hand, and the uniqueness of parallel line, one of the characteristics of Euclidean geometry, on the other. This discussion can be applied to introducing and developing exploratory learning on area in that it revisits the ordinary thinking on area.

• 한국정밀공학회지
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• 제32권2호
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• pp.149-157
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• 2015

Ball and roller bearings are commonly used machine elements for supporting rotating motion about shafts in simple devices including bicycles, in-line skates, and electric motors, as well as in complex machines. Heat is generated by the friction in the bearings, which causes the temperature inside the bearing to increase. If the heat is not appropriately removed from the bearing, elevated temperatures may give rise to premature failure. It is, therefore, important to be able to calculate the temperature in the bearings due to friction.Here, we describe a method to estimate the frictional torque in bearings using an empirical formula developed using a method based on bearing analysis tool and the measured frictional torque in a spindle system. Thermal analysis of the spindle system including the bearings was achieved using the finite element method (FEM), and the bearing temperature was compared with measured data to verify the empirical formula.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.908-911
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• 2002

This paper investigates the characteristics of deflection for circular plate that has same supporting condition along the width direction of plate according to the area change of supporting end. For two boundary conditions such as simple supporting and clamping on both ends, this study derives maximum deflection formula of circular plate using differential equation of elastic curve, assuming that a circular plate is a beam with different widths along the longitudinal direction. The deflection formula of circular plate is verified by carrying out finite element analysis with regard to the ratio of length of supporting part to radius of circular plate.