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- 저자 : 한문식(Han Moon Sik) (검색결과 145 건)
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한문식(Moon-sik Han),조재웅(Jaeung Cho) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
This study investigates the strength durability of an automotive front bumper subjected to vibrations during driving. Through structural analyses, the maximum equivalent stresses of models 1 and 2 were found to be 187.09 and 278.4 MPa, respectively. The maximum deformations of models 1 and 2 were 1.3772 and 2.675 mm, respectively. As model 1 shows less deformation than model 2, it is stronger than model 2. Models 1 and 2 show natural frequencies within 230 Hz as the range of the maximum harmonic response frequency. Models 1 and 2 have maximum amplitude displacements of 0.105 and 0.154 mm at critical frequencies of 159 and 110 Hz, respectively. As model 1 has a higher critical frequency than model 2, it has more strength durability than model 2. This study result can be effectively utilized for the design of a front bumper by investigating prevention against damage and its strength durability.
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한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
This study analyzes stress, fatigue and vibration on main rotor and body of helicopter. The maximum stress is shown on adjoint part between body and main rotor at the lower position of main rotor. As the maximum displacement amplitude is happened at 4000Hz, there is no resonance and the state of helicopter becomes safe at hovering without the abnormal air current and the disabled rotor. Among the cases of nonuniform fatigue loads, "SAE bracket history" with the severest change of load becomes most unstable but "Sample history" becomes most stable. In case of "Sample History" with the average stress of 0MPa to -105MPa and the amplitude stress of 0MPa to 8.539×105MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 times more than the damage possibility of "SAE bracket history" or "SAE transmission". The structural result of this study by using the analysis of vibration and fatigue can be effectively utilized for safe and durable design of helicopter.
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피로 하중하에서의 복수표면크랙진전에 관한 수치시뮬레이션
한문식(Moon Sik Han) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.6
This paper describes a versatile finite element technique which has been used to investigate wide range of structural defects of practical importance. The procedure automatically remeshes the three-dimensional finite element model during the stages of crack growth. Problems include the surface cracks in leak-be fore-break situations, the shape development of multiple surface defects.
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CES함수를 이용한 사립대학 부가가치세 조정세율 결정에 관한 연구
한문식(Han Moon Sik),백일우(Il-Woo Paik) 한국교육재정경제학회 2004 敎育財政 經濟硏究 Vol.13 No.2
본 연구는 사립대학의 재정확충을 위한 방안의 하나로 CES함수를 이용하여, 사립대학의 부가가치세 감면에 대한 세율조정 모형을 개발하고 조정세율을 구하였으며, 조정세율을 활용하여 사립대학의 재정확충 효과를 실증적으로 분석하였다. 이를 위한 분석대상 세목으로는 2002학년도 우리나라 4년제 일반대학 137개교의 부가가치세를 사용하였다. 그리고 재정배분의 효율성을 측정하기 위한 지수로는 CES함수를 사용했으며, 재정지표로는 학생 1인당 장학금과 기자재구 입비 지표를 이용하였다. 이러한 원자료를 이용해서 모의실험을 통해 조정세율을 확인하였으며, 이때 도구로는 JAVA언어를 사용하였다. 실험결과 CES함수를 이용한 효율성의 측정가능성을 확인하였으며, 그리고 정부가 효율성 향상을 위해 부가가치세의 세율조정을 한다면 조정세율은 4.7%~5.0% 사이에서 결정하는 것이 바람직한 것으로 나타났다. 또한 부가가치세 조정세율을 적용하여 세율감면이 이루어진다면 상당규모의 감면액을 사립대학에 환급하게 되고, 그 결과 실질적인 재정확충 효과는 물론 재정지표의 개선이 이루어지는 것으로 나타났다. This study developed a negotiable value added tax rate model for private university with the application of CES utility function as one of private university financial improving plans, and then produced Negotiable Value Added Tax Rate by using the negotiable value added tax rate model, and analyzed out the effect in private university finance improvement. The value-added taxes levied on 137 private universities in 2002 were employed as the analyzing data, And the applied index was CES utility function in order to measure the efficiency of finance distribution. Scholarships and teaching aids cost per student were chosen as the financial indexes. A mock experiment was carried out by using CES utility function with the terms of all the data mentioned above, and negotiable tax rate was produced in JAVA Program. The experiment carried out by CES utility function resulted in the possibility of measuring efficiency. The study tells us it might be desirable that the adjusted tax rate {or Negotiable Value-Added Tax Rate} range from 4.7% to 5.0%. And then the application of the Negotiable Tax Rate{Negotiable Value-Added Tax Rate} proved that quite a bit amount of tax return would be deducted from current taxation. And it confirmed that not only the fairly practical improvement of the private university finance but also its financial indexes might be realized.
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An analysis about the behavior of rubber component with large deformation
Moon-Sik Han(한문식),Jae-Ung Cho(조재웅) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.3
The non-linear finite element program of the large deformation analysis by computer simulation has been used in the prediction and evaluation of the behaviors of the non-linear rubber components. The analysis of rubber components requires the tools modelling the special materials that are quite different from those used for the metallic parts. The nonlinear simulation analysis used in this study is expected to be widely applied in the design analysis and the development of several rubber components which are used in the manufacturing process of many industries. By utilizing this method, the time and cost can also be saved in developing the new rubber product. The objective of this study is to analyze the rubber component with the large deformation and non-linear properties.
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한문식 ( Moon Sik Han ),조재웅 ( Jae Ung Cho ),김재열 ( Ja Veol Kim ) 조선대학교 공학기술연구원 2011 공학기술논문지 Vol.4 No.2
In this study, the deformation and stress were analyzed by structural analysis based on modal and harmonic response at resonance on suspension part. The load case is applied with upper middle face, maximum equivalent tress or total displacement becomes 2 or 3 times respectably as much as the case of lower middle face. The six mode of natural frequencies was below 5,000 Hz. The maximum equivalent stress and total displacement at harmonic response of suspension were shown as 1.9542 x 10(11) Pa and 0.059868 m on 1,300 Hz. This frequency is nearly the same as that of the 1316.7 Hz. at Mode 2 of natural vibration. The comfortability of passenger can be effectively utilized at suspension part by use of this design model.
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