http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kyoung‑Ho Kim,Kuk‑Jin Hwang,Heesoo Lee,Seong‑Min Jeong,이명현,배시영 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.1
Compression glass molding is a promising technique for mass production of near net-shaped, high-precision, and low-cost optical glass elements. However, the glass molding process causes the damage of glass and the mold during demolding because of the chemical or physical adhesion of the glass to the mold. To overcome this limitation, graphite molds are used owing to their good lubrication and easy machining. However, graphite materials show rapid oxidation at high temperatures in the presence of oxygen. Therefore, in this study, a thin SiC coating layer was deposited on the graphite mold using the chemical vapor deposition (CVD) method to utilize the lubrication properties of graphite and the anti-oxidation properties of SiC. The specimen obtained using the low-temperature CVD method showed high carbon content and good lubrication properties than that obtained using the high-temperature CVD method.
Controlled infiltration profile of SiC coating layer on graphite by Si vapor deposition reaction
Kuk-Jin Hwang,Si-Young Bae,Kyoung-Ho Kim,Yoon-Cheol Lee,Jung-Tae Hwang,Heesoo Lee,Seong Min Jeong,Myung-Hyun Lee 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.2
SiC-coated graphite was successfully fabricated at different temperatures (1300-1600 oC) through a silicon vapor depositionreaction (Si-VDR) process. Si powder was used for the Si source of the SiC coating layers. When Si powder was evaporatedat high temperature near the melting point of bulk Si, Si gases are moved and changed into Si liquid at the surface of thegraphite. The high-temperature process facilitated the formation of SiC coating layers on the graphite. The microstructural,mechanical, and thermal oxidation properties of the coated graphite were investigated.
황미선,기윤경,차승라,오창근,지국섭,김동훈,박미숙,김정호,윤영주,김광원 朝鮮大學校 口腔生物學硏究所 1999 口腔生物學硏究 Vol.23 No.2
In most individuals, the permanent teeth will be erupt uneventfully and replace their primary successors. However, sometimes teeth fail to erupt. Most of these unerupted teeth are diverted or angulated aberrantly and eventually lose their potential to erupt. It is referred to as impacted teeth. These teeth are not hopeless; it is possible to use the remaining teeth as anchorage, surgically uncovered the impacted tooth, and orthodontically move the tooth into the arch. The specific surgical procedure and the orthodontic mechanics, however, will vary depending upon the type of tooth and its position relative to the remaining erupted teeth. This study identifies the most commonly impacted teeth and discusses the causes of impaction and describer the various surgical procedures to uncover these teeth, and illustrates the orthodontic mechanics used to erupted the teeth into proper alignment and occlusion.
Young Jin Hwang,Ki Sung Chang,Young Jae Kim,Sukjin Choi,Hyung Jun Kim,Kyoung-Jun Kim,Haigun Lee,Tae Kuk Ko IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>Both AC transport current and magnetic field which are generated by the AC transport current lead to energy loss so called transport AC loss in power equipments using superconducting tapes. The transport AC loss is closely related to stability and efficiency of superconducting power equipments. Therefore, we need to deal with the transport AC loss characteristics of the superconducting tapes under various conditions. In this paper, we investigated temperature dependence of the transport ac loss with respect to the superconducting tape array geometry. The transport AC loss was measured by an electrical method. The experiments were carried out at temperature from 63 K to 77 K . We proved validity of the measurements by a finite element method. Measured data showed that the transport AC loss was influenced by not only superconducting tapes array geometry but the operating temperature. Proposed results in this paper would be utilized to design superconducting power equipments.</P>
Beom-Young Park,Kyoung-Mi Park,Jin-Hyung Kim,Soo-Hyun Cho,Nam-Kuk Kim,Min-Jin Song,Chang-Soo Lee,In-Kyung Cho,Ho-Sung Choe,Kyeong-Seon Ryu,In-Ho Hwang 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.1
This study was conducted to identify the effect of chilling temperature (-3 and 6℃) and aging (1- and 7-day) on objective meat quality, collagen solubility, and free amino acids in pork (longissimus muscle of Yorkshire). Warner-Bratzler (WB)-shear force indicated that variation in chilling temperature had no detectable effect on meat tenderness and tenderization during the 7-day aging period. Among the 13 detected free amino acids, only 3 amino acids (histidine, valine, leucine) were significantly affected by the temperature treatment (p<0.05). Collagen solubility was significantly increased at 6℃ treatment (p<0.05). There was a significant linear relationship (r=0.67, p<0.05) between changes in free amino acids and WB-shear force during the 7-day aging period. These results confirmed that chilling conditions had significantly affected collagen solubility, and meat tenderization occurred in direct proportion to an increase in free amino acids.