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접촉요소를 이용한 유한요소법에 의한 타이어 가류브레더 팽창거동에 관한 연구
김항우,황갑운,조균종,Kim, Hang-Woo,Hwang, Gab-Woon,Cho, Kyu-Zong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
In curing process of tire, contact and slip occurs between green tire and curing bladder. The curing process is a critical step in the manufacture of tires. In this investigation, curing bladder shaping is examined using a finite element method. Specifically, a finite element model between the inner part of green tire and the outer part of curing bladder is generated using contact element and curing bladder is generated using incompressible element. Numerical analysis are performed on two different bladder types, different overall outer diameters of curing bladder and different heights of curing bladder. Numerical results show that contact pressure is increased by using toroidal type of curing bladder, increasing overall diameter and increasing height of curing bladder. To obtain natural equilibrium carcass line, there is a requirement in increasing contact pressure of the section between side and bead.
Dental Fear Survey 척도를 이용한 치과위생사들의 치과공포감 및 관련요인
이재라 ( Jae Ra Lee ),홍선화 ( Sun Hwa Hong ),황갑운 ( Gab Woon Hwang ),김서연 ( Seo Yeon Kim ) 한국치위생학회 2016 한국치위생학회지 Vol.16 No.3
Objectives: The purpose of the study is to investigate the dental fear and related factors of dental hygienists using dental fear survey. Methods: A self-reported questionnaire was completed by 279 dental hygienists from January 15 to March 28, 2015. The study instrument was dental fear survey. Data were analyzed using SPSS 19.0 program by t-test, one way ANOVA and stepwise multiple regression analysis. The questionnaire included general characteristics of the subjects, subjective oral health status, use of dental care services, subjective oral health status, and recent dental treatment. Results: Alcohol consumption was the most influential factor to the dental fear. The subjective status of oral health and direct pain sense also contributed to the dental fear. Conclusions: To reduce the dental fear, it is important to have high confidence toward the dental treatment performance in the dental hygienists.
김수관(Su-Gwan Kim),전창길(Chang-Gil Chon),황갑운(Gab-Woon Hwang),김병옥(Byung-Ock Kim) 대한구강악안면외과학회 2003 대한구강악안면외과학회지 Vol.29 No.1
The purpose of this study was to analyze the stress pattern in different bone densities surrounding fin-type implant fixtures under the vertical and inclined loads (30) of 200N. Von-Mises stress, the pricipal stress, and the displacement on the implant fixtures under the loads were calculated by using the finite element method. Four different types of bicon implant fixture were used for this study. The geometries of implant fixtures to develop the model were used by a sales brochure and profile project. Three-dimensional finite element model of the mandible was developed with 6.0 mm implant in diameter wurrounded by approximately 2.5 mm of bone. Bone densities were classified according to the elastic modulus of the tree. The finite element program MSC PATRAN (MSC, Software Corp., USA) were used for analysis of stress distribution. The value of the Von-Mises stress, the pricipal stress, and the displacement on the implant fixtures under the vertical and inclined loads were decreased when the diameter of implant fixture was increased, and increased when the elastic modulus was decreased. The stress on implant fixture under the vertical and inclined loads was distributed through the length of implant fixtures in D3 and D4. The distribution of stress was influenced by the direction of loads. In the wide diameter of implants, the stress was developed at outer surface of bone. In conclusion, this study suggest that stress developing on the peri-implant tissues might be influenced by the dimension of implant, elastic modulus of bone, and direction of loads.