http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조흥규 대한치과기공학회 2005 대한치과기공학회지 Vol.27 No.1
This study is to show the qualitative analytic methods of facial asymmetry with threedimensional morphometry and find out asymmetry change resulted from enlarging three local regions. Steel balls (1.2 in diameter) were attached in twenty seven landmarks of a symmetrical artificial human skull. This artificial human skull was used as experimental materials. Twelve different asymmetrical artificial human skulls were formed by gradually enlarging the mandibular body length, gonial angle, and ramus height of the left hemiface. From the three-dimensional morphometry of each skull type, nine local area measurements and three total sum area measurements(representing the mandibular area, maxillary area, and lower facial area) were acquired and made into the surface area asymmetry degree. Menton deviation itself was used as the surface area asymmetry degree while right-left percentages were used in the other measurements. These surface area asymmetry degrees were compared with each other to find out asymmetry change according to the degree of actual facial asymmetry. Through the statistical analysis, following results were obtained. The results were as follows: 1. Left maxillary area of artificial human skull was 7.13 0.26% larger while mandibular area was 4.14 0.12% smaller than each those of right hemiface. After all, left lower facial area was 1.44 0.07% larger than those of right hemiface.(n=7) 2. Among the reduce rates of surface area asymmetry degree resulted from enlarging three local regions, ramus height was similar to mandibular body length while it was bigger than those of gonial angle. 3. Among the increase rates of menton deviation resulted from enlarging the local regions, ramus height was the biggest, mandibular body length was the second and gonial angle was the smallest. These results suggest that three-dimensional morphometry can be used to qualitatively analyse facial asymmetry and the asymmetry degree is more influenced by enlarging the ramus height, mandibular body length than those of gonial angle.
저탄소 박판강재의 레이저 용접과정에서 열영향부에 존재하는 탄화물 입자의 분해 거동
김기철,조흥규,정호신 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.6
Metallurgical behavior of laser welded cold rolled low carbon steel was investigated. Welding was performed with CW Nd:YAG laser system. Applied laser power, travel speed and nitrogen blowing pressure were 720W CW, 17mm/s and 196kPa, respectively. According to the test results, many carbide particles were observed on the base metal surface that was polished and etched with nital solution. The carbide particles at the welding heat affected zone were thought to be dissolved during welding process. Microstructural inspection revealed that dissolved carbide particles formed mixed phase of very fine martensite and bainite. Test results also demonstrated that the hardness of matrix remained constant value of around 160Hv over the welding heat affected zone. Dissolved carbide particles, however, showed higher average hardness values of around 276Hv near the fusion boundary and 700Hv at the welding heat affected zone of 0.4mm apart from the fusion line. It was considered that care should be given to minimize the test error when measuring the hardness value since many of the dissolved particles were so small that it was not easy to aim the indentor of the testing machine just on the objects.
한인구,조흥규,박종엽 한국전문가시스템학회 1995 학술대회 Vol.1 No.1
Many financial studies have said that financial market is random and efficient. However, financial investors predict the motion of financial market with two major techniques: fundamental analysis and technical analysis. Recently, artificial intelligence methods have been focused by financial researchers. Neural network, genetic algorithm, fuzzy logic, and nonlinear dynamics are major representative of AI methods which have been applied to financial market problem. This paper reviews and analyzes the financial studies which have used AI methods.