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이은희,최희락,정해용,Lee, Eun-Hee,Choi, Hee-Rak,Jeong, Hae-Yong 한국재료학회 2006 한국재료학회지 Vol.16 No.3
Pressable ceramics have many applications in the field of dental industry because of their excellent esthetic, compressive strength, chemical durability. Despite these attractive characteristics, they have not been widely used since they are very brittle and extremly sensitive to porcelain. In this study, the fabrication of pressable dental porcelain ($SiO_2-Al_2O_3-K_2O-Na_2O$) as a function of contents of $Al_2O_3,\;BaO\;and\;ZrO_2$ were investigated. And then compressive strength, Vickers hardness, density and thermal expansion coefficient (TEC) tests have been carried out to evaluate properties of pressable dental porcelain fabricated. The property of pressable dental porcelain fabricated by adding of 15%$Al_2O_3$ and 2%BaO contents was closely approximated to that of natural tooth.
건식 듀얼 클러치 변속기 기반 2단계 발진 슬립제어와 차량 테스트
김병진(Byeong-Jin Kim),이희락(Hee-Rak Lee),조주용(Joo-Yong Jo),이응수(Eung-Soo Lee),강지우(Ji-Woo Kang) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Dual Clutch Transmissions (DCT) are becoming more and more used as an improving add-on solution on manual and automated manual transmission systems. The key issues in dry clutch control is launch and shift control. Dry clutch control is so difficult due to variation of clutch transfer torque characteristic as varying factors. This paper is proposed launch control using Two-stage slip control and implemented to real vehicle with installed DCT.
윤성환(Sung-Hwan Yoon),안희락(Hee-Rak Ahn),문희성(Hee-Sung Moon),최규영(Gyu-Yeong Choe),이병국(Byoung-Kuk Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
본 논문에서는 배터리 시스템에서 각 파라미터가 시스템에 미치는 영향을 분석하였다. 이를 위해 몇 가지 배터리 모델을 선정하였으며 모델별로 다양한 변화를 주어 시뮬레이션을 수행하였다. 시뮬레이션의 결과를 바탕으로 파라미터 특성에 대한 분석을 하였고 그 결과를 바탕으로 다양한 모델에 적용, 분석함으로써 타당성을 검증하였다.
이길근,정해용,최희락 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10
The formation mechanisms of intermetallic compound particles during the tumbler-ball milling of 2Cu+Al powders and the vibratory ball milling of Mo+2Si powders were investigated by X-ray diffraction and microscopic observations, respectively. Any temperature variations at the mill surface during a tumbler-ball milling of 2Cu+Al powders have not occurred, but the thermodynamically stable intermetallic compound particles, Cu₂Al phases in the vicinity of surface of the equiaxed globular powder particles milled have been formed. The other side, a abrupt rise of temperature, namely, exothermic phenomenon have been occurred in 50h at the mill surface during a vibratory-ball milling with 25.4㎜ balls of Mo+2Si powders, as the results the intermetallic compound particles, i.e, tetragonal MoSi₂ phases have been observed. It was considered that the formation of intermetallic compounds occurred by a combustion synthesis reaction due to the exothermic heat on the basis of the impact energy of ball during the milling.