http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김창은,박훈,김배연,이동윤,Kim, Chang-Eun,Park, Hoon,Kim, Bae-Yeon,Lee, Dong-Yoon 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.7
The hydroxyapatite powder was prepared by the precipitation method. The obtained powder was heat-treated and its products were investigated in order to characterize its decomposition process. The powder was Ca-deficient hydroxyapatite with no relation to the Ca/P mole ratio in the initial solution. The obtained hydroxyapatite was thermally decomposed into tricalcium phosphate [Ca3(PO4)2, TCP] after heat-treatment above 80$0^{\circ}C$ and the extent of the decomposition was dependent on the nonstoichiometry of obtained hydroxyapatite, and the resultant hydroxyapatite and tricalcium phosphate maintained stable forms up to 120$0^{\circ}C$. The hydroxyapatite powder had the better stability with the samller the nonstoichinometry of hydroxyapatite. And the quantities of tricalcium phosphate obtained after decomposition were decreased, and also the corresponding decomposition temperatures were increased with decreasing extent of nonstoichiometry in precipitated hydroxyapatite.
평삭공정에서 경면가공을 위한 단결정 및 다결정 다이아몬드 다중공구의 가공성 평가
김창의,최환진,전은채,제태진,강명창,Kim, Chang-Eui,Choi, Hwan-Jin,Jeon, Eun-Chae,Je, Tae-Jin,Kang, Myung-Chang 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
Mirror surface machining for large area flattening in the display field has a problem such as a tool wear and a increase in machining time due to large area machining. It should be studied to decrease machining time and tool wear. In this paper, multi-tool machining method using a PCD tool and a SCD tool was applied in order to decrease machining time and tool wear. Machining characteristics (cutting force, machined surface and surface roughness) of PCD tool and SCD tool were evaluated in order to apply PCD tool to flattening machining. Based on basic experiments, the PCD/SCD multi-tool method and the SCD single-tool method were compared through surface roughness and machining time for appllying large area mold machining.
Fuzzy Delpi 법(法)을 이용한 일반 지수 예측 시스템 구축
김창은,최환석,Kim, Chang-Eun,Choi, Hwan-Seok 대한산업공학회 1996 산업공학 Vol.9 No.1
The Delphi method is widely used for long and middle range forecasting in management science. It is a method by which the subjective data of experts are made to converge using statistical analysis. The Fuzzy Delphi Method(F.D.M.), anew application of the Delphi method using Triangular Fuzzy Numbers(T.F.N.), can help to predict the uncertainty, synthesize the opinion and calculation of those assumed dissemblance index and fuzzy distance. Furthermore, the programming of the F.D.M. process to feed paper and data back to experts can make them more accurately predict the various information.
Gd<sub>2</sub>O<sub>3</sub> 첨가에 따른 AC PDP 보호막용 MgO 박막의 광학적.전기적 특성
김창일,임은경,박용준,이영진,백종후,최은하,정석,김정석,Kim, Chang-Il,Lim, Eun-Kyeong,Park, Young-Jun,Lee, Young-Jin,Paik, Jong-Hoo,Choi, Eun-Ha,Juang, Seok,Kim, Jeong-Seok 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
The effects of $Gd_2O_3$ addition and sintering condition on optical and electrical properties of MgO films as a protective layer for AC plasma display panels were investigated. Doped MgO films prepared by the e-beam evaporation have a higher ${\Upsilon}$ (secondary electron emission coefficient) than pure MgO protective layer. Relative density and grain size increased with amount of $Gd_2O_3$ up to 100 ppm and then decreased further addition. These results showed that discharge properties and optical properties of MgO protective layers seemed to be closely related with microstructure factors such as relative density and grain size. Good optical and electrical properties of ${\Upsilon}$ of 0.138, surface roughness of 5.77 nm and optical transmittance of 95.76 % were obtained for the MgO+100 ppm $Gd_2O_3$ protective layer sintered at $1700^{\circ}C$ for 5 hrs.
침전법으로 제조한 Hydroxyapatite Ceramics의 기계적 성질
김창은,편영범,김배연,박훈,Kim, Chang-Eun,Pyeon, Young-Beom,Kim, Bae-Yeon,Park, Hoon 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.2
The effects of starting composition, sintering temperature and porosity on the mechanical properties of hydroxyapatite ceramics were investigated. The hydroxyapatite powder were prepared by precipitation method using Ca(NO3)2.4H2O and (NH4)2.HPO4. The obtained powders were Ca-deficient hydroxyapatites and as the Ca/P mole ration in the initial solution was increased, the particle size of the precipitates was decreased, and the decomposition of hydroxyapatite to $\beta$-TCP was controlled. The porosity, as well as Ca/P mole ratio in starting composition and sintering temperature, plays major role in the mechanical properties of dense hydroxyapatite ceramics.