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Colemanite 광물로부터 붕소화합물의 제조에 관한 연구 : 붕산제조 및 반응기구 (I)
최병현,임형미,지미정,장재훈,백종후,이미재,Choi, Byung-Hyun,Lim, Hyung-Mi,Jee, Mi-Jung,Jang, Jae-Hun,Paik, Song-Hoo,Lee, Mi-Jai 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.10
Colemanite($Ca_2B_6O_{11}{\cdot}5H_2O$)원광을 황산과 반응시켜 붕산을 추출하는 방법과 그 반응 기구에 대하여 연구하였다. colemanite에 황산을 첨가하고 가열하여 colemanite의 칼슘 성분을 황산칼슘으로 분리하고 붕산을 추출할 때, 첨가하는 황산 첨가량 은 colemanite에 존재하는 Ca 성분을 분리할 때 필요한 화학 양론적인 양보다 많아야 되며, 또한 초기 pH가 5 미만이어야 대부분의 colemanite가 분해되었다. 붕산으로 추출 시 영향을 주는 인자로는 분해온도, 분해시간, 황산 첨가량, 황산암모늄 첨가량, pH. 농축 정도 및 건조온도와 시간이었다. 황산 첨가 시 colemanite에 포함되어 있는 불순물 중 CaO와 MgO는 황산과 반응하여 침전을 형성하고, $SiO_2$는 불용 성분으로 황산칼슘과 함께 분리되고, $Al_2O_3,\;Fe_2O_3,\;TiO_2,\;Na_2O$ 등은 황산과 반응하여 액상 상태로 존재하였다. 이 액상에 암모니아를 첨가하여 존재하는 나머지 불순물을 수산화물 형태로 분리, 석출하였으며, pH 조정과 산성화, 농축, 재결정화 과정을 통하여 붕산을 제조하였다. We present extraction process and reaction mechanism of boric acid from one of calcium borate ores, colemanite by reaction with sulfuric acid. Colemanite has been fully decomposed under pH 5 with sufficiency amount of sulfuric acid, more than the amount stoichiometrically required. Calcium sulfate was separated out, leaving boron in the liquid phase after sulfuric acid addition. The extraction process of boric acid was affected by dissolution temperature and time, amount of sulfuric acid and ammonium sulfate, pH and a degree of concentration before recrystallization. The $SiO_2$ of the impurities which colemanite contains was insoluble so that it was separated out with calcium sulfate from liquid phase. The species of $CaO,\;Al_2O_3,\;Fe_2O_3,\;MgO$ were remained in a liquid phase after reaction with sulfuric acid. These impurities were separated out by addition of ammonia to the liquid phase, funhermore, boric acid was produced by process of pH adjustments and acidification, concentration, and recrystallization.
최병현,지미정,안용태,고영수,이영훈,Choi, Byung-Hyun,Ji, Mi-Jung,An, Yong-Tae,Ko, Young-Soo,Lee, Young-Hun 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.8
$P_2O_5-SnO_2$ system $0.5SnO_2-xP_2O_5-(0.5-x)B_2O_3$(x=0.1, 0.2, 0.3, 0.4, 0.5) glasses have been prepared for Pb-free low temperature glass frit. A investigation about the effect of $B_2O_3$ substitution on properties of $P_2O_5$ glasses, including glass structure properties, thermal properties, and mechanical properties was presented. Substance that is responsible for in moisture absorption existing circumstances supposes by phosphate, and excess moisture tolerance that state funeral's structure is improved breaking does not affect in state funeral bond that only most single bond remains, and can know that does not suffer big impact in boric oxide anomaly present state. This phenomenon estimates that connect with structure change. It is thought according to link this result the phosphoric acid happened structural change. $B_2O_3$ displacement quantity 0.3 mole put out $BO_4$ structures, but above 0.3 mole it changed with the case $BO_3$ structure which it displaces.
고순도.미립 $TiO_2$분말 제조에 관한 연구 -가수분해 반응 조건에 따른 분말특성(II)-
최병현,허혜경,이미재,김환,김무경,Choi, Byung-Hyun,Huh, Hye-Kyung,Lee, Mi-Jai,Kim, Hwan,Kim, Moo-Kyung 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.10
TiCl$_4$, 물 및 1-propanol의 혼합용액으로부터 미립 TiO$_2$분말 제조시, 1-propanol과 물의 부피비, 반응온도, 반응유지시간 및 TiCl$_4$mole 농도에 따른 분말 특성 및 결정상 생성에 대해 조사하였다. 반응온도가 3$0^{\circ}C$ 이상일 때 Ti 수화물의 초기 침전이 생성되었고 반응온도가 TiCl$_4$mole 농도가 증가함에 따라 입자크기는 증가하였고 $600^{\circ}C$ 하소시 1-propanol과 물의 부피비가 2보다 크고 반응온도가 7$0^{\circ}C$보다 낮을 때 주결정상은 anatase였다. 입자크기가 미세하고 입자크기 분포가 좁은 범위를 갖는 조건은 1-propanol과 물의 부피비가 2, 반응온도가 7$0^{\circ}C$, TiCl$_4$mole 농도가 0.2 mole/ι일 때였으며, 결정상의 생성은 1-propanol과 물의 부피비가 2, 반응온도가 3$0^{\circ}C$ 이상일 때 anatase에서 rutile로 전이하는 온도가 높아졌다. 이와 같은 반응인자에 따른 효과는 용매의 유전상수, 티타니아의 용해도, 입자의 표면전위 등의 효과와 관계가 있었다.
TiCl<sub>4</sub>를 출발원료로한 구형 Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> 분말합성 및 리튬이차 전지특성
최병현,지미정,권용진,김은경,남산,Choi, Byung-Hyun,Ji, Mi-Jung,Kwon, Yong-Jin,Kim, Eun-Kyung,Nahm, Sahn 한국재료학회 2010 한국재료학회지 Vol.20 No.12
One of the greatest challenges for our society is providing powerful electrochemical energy conversion and storage devices. Rechargeable lithium-ion batteries and fuel cells are among the most promising candidates in terms of energy and power density. As the starting material, $TiCl_4{\cdot}YCl_3$ solution and dispersing agent (HCP) were mixed and synthesized using ammonia as the precipitation agent, in order to prepare the nano size Y doped spherical $TiO_2$ precursor. Then, the $Li_4Ti_5O_{12}$ was synthesized using solid state reaction method through the stoichiometric mixture of Y doped spherical $TiO_2$ precursor and LiOH. The Ti mole increased the concentration of the spherical particle size due to the addition of HPC with a similar particle size distribution in a well in which $Li_4Ti_5O_{12}$ spherical particles could be obtained. The optimal synthesis conditions and the molar ratio of the Ti 0.05 mol reaction at $50^{\circ}C$ for 30 minutes and at $850^{\circ}C$ for 6 hours heat treatment time were optimized. $Li_4Ti_5O_{12}$ was prepared by the above conditions as a working electrode after generating the Coin cell; then, electrochemical properties were evaluated when the voltage range of 1.5V was flat, the initial capacity was 141 mAh/g, and cycle retention rate was 86%; also, redox reactions between 1.5 and 1.7V, which arose from the insertion and deintercalation of 0.005 mole of Y doping is not a case of doping because the C-rate characteristics were significantly better.
최병현(Byoung Hyun Choi),김지훈(Ji Hoon Kim),곽진호(Jin Ho Kwak),장혁재(Hyuck Jae Jang),한명식(Myung Sik Han) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.4
Purpose: T2 gastric cancer is tumor invading proper muscle or subserosal layer. The 2002 American Joint Committee on Cancer subdivided the pT2 gastric adenocarcinoma into a type pT2a (invasion of the proper muscle) and a type pT2b (invasion of the subserosa). The aim of this study was to evaluate the differences between pT2a and pT2b gastric cancers of the clinicopathological features and the prognostic factors. Methods: A series of curative operations were performed on 194 patients with pT2 gastric cancer from January 1999 to February 2006. We reviewed, retrospectively, the clinicopathologic characteristics, the 3-year disease free survival and the 5-year disease specific survival rates. Results: There were significant clinicopathologic differences between pT2a and pT2b gastric cancer in tumor size and the number of metastatic lymph nodes. Both of the 3-year disease free survival time and the 5-year disease specific survival time were much longer for the pT2a gastric carcinoma patients than those for the pT2b gastric carcinoma patients. Conclusion: It is important to consider the differences between pT2a and pT2b gastric cancers for prediction of recurrence or prognosis. Furthermore, new staging of pT2a and pT2b cancer may be necessary.
崔秉鉉(Byunghyun Choi) 한국고고학회 2001 한국고고학보 Vol.44 No.-
이 논문은 6세기 전반기 이전 신라의 수도 경주에서 적석목곽분이 축조되고 있을 때 낙동강 이동지방에서 축조되고 있었던 초기 횡혈식석실분의 유형, 구조, 장법, 계보, 그리고 이들과 경주 석실분과의 관계를 살피고자 한 것이다. 낙동강 이동지방에 횡혈식석실분이 수용되기 시작한 것은 5세기 전반기부터이며 신라에서는 중앙보다는 지방에서, 중앙귀족보다는 지방세력이 횡혈식석실분을 먼저 수용하였다. 중앙보다는 지방이 새로운 묘제의 수용에서 개방적이었던 것이다. 신라 초기 석실분의 유형과 구조는 신라 후기 경주의 석실분으로 계승·발전되었다. 그러나 신라 초기 석실분의 장법은 당시 수혈식 묘제의 장법을 따르고 있었다. 백제의 초기 석실분과 신라의 초기 석실분은 그 세부구조에 있어서 차이가 있고, 그것은 백제의 초기 석실분이 낙랑·대방고지의 전축분계 석실분에서, 신라의 초기 석실분이 고구려 석실분에서 유래된 것이기 때문이었다. 서울 강남지역 석실분에 대해서 최근 한성기 백제축조 후 신라 재사용설이 제기되었으나 근거가 없다 The aim of this essay is to identify the types, structures, burial modes and its historical derivations of the early stone chamber tomb with entrance in the east of Nakdong river which constructed before the first half of the sixth century, when the wooden chamber with stone mound tombs had been constructed in Kyungjoo, the capitol of the Shilla, and to clarify their relations to those of the stone chamber tombs in Kyungjoo area. In the east area of the Nakdong river, were introduced the stone chamber tombs with entrance from the first half of the fifth century, which found general acceptance first in the periphery rather than in the core, and first among the local gentry rather than among the central aristocrats. Accepting the new burial system, the ruling classes in the periphery were more open than those in the core. The types and structures of the early stone chamber tomb of the Shilla were succeeded and developed in the stone chamber tomb in Kyungjoo area at the period of the later Shilla. However, the burial modes of the early stone chamber tomb followed the burial system of the vertical entrance style tomb. There were many structural differences between the early stone chamber tomb of the Baikje and that of the Shilla. These differences were due to the fact that the early stone chamber tomb of the Baikje originated from the brick chamber tomb with entrance of the Lo- rang, whereas the early stone chamber tomb of the Shilla took its origin in the stone chamber tomb of the Koguryo. Finally, I think the latest thesis on the stone chamber tomb in Kangnam area of Seoul to be historically unsupported that insists on the re- use of the stone chamber tomb of the Baikje builded in the Hansong phase by the Shilla for their convenience.