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용융 결정화에 의한 고용계 혼합물로부터 나프탈렌의 분리 정제
김광주(Kwang Joo Kim),김정우(Jung Woo Kim),김재경(Jae Kyeong Kim),천양호(Yang Ho Cheon) 한국공업화학회 2002 공업화학 Vol.13 No.1
경막형 용융 결정화(layer melt crystallization)을 이용하여 고용계 혼합물로부터 나프탈렌의 분리 정제에 관한 연구가 수행되었다. 고용계 naphthalene-benzothiophene의 고액 상평형과 평형 분배 계수가 조사되었다. 혼합물에서 나프탈렌 결정층의 성장 속도는 과냉각도의 2.3승에 비례하였다. 결정화 조건에 따라 결정층에 내포되는 불순물의 양은 용융 결정화의 실험 변수인 냉각 속도 및 과냉각도와 결정층의 형상학적 분석을 통하여 조사되었다. 유효 분배 계수는 냉각 속도 및 과냉각도가 감소함에 따라 감소하였다. 용융 결정화의 불순물 거동은 Wintermantel 모델에 의해 해석되었다. 결과적으로 고용계의 용융 결정화 공정에서 불순물은 kinetic 불순물의 결정층에 내포에 의해 이루어짐을 알 수 있었다. 경막형 용융 결정화의 나프탈렌 분리에서 kinetic 불순물은 냉각 속도<0.01 K/min 및 과냉각도<9 K일 때 배제될 수 있었다. The separation and purification of naphthalene from naphthalene-benzothiophene has been studied by a melt crystallization. The solid-liquid equilibria and equilibrium distribution coefficient of naphthalene-benzothiophene system were investigated. The crystal growth rate of naphthalene from naphthalene-benzothiophene system was found to be proportional to the subcooling degree with power of 2,3. The inclusions of impurity in crystals were investigated through a morphological point of view with consideration of the operating variables like the cooling rate and the subcooling degree. The effective distribution coefficient was observed to decrease with decreasing the cooling rate and the subcooling degree, which affect the crystal growth rate. All the experimental results for naphthalene-benzothiophene system have been evaluated with Wintermantel`s model, and the kinetic impurity was found to be incorporated in the layer melt crysrallization, despite of the solid solution mixture.
용융 결정화에서 Sweating 조작을 이용한 Caprolactam 결정의 정제
김광주(Kwang Joo Kim),김갑모(Kap Mo Kim),이혜종(Hye Jong Lee),김재경(Jae Kyeong Kim) 한국공업화학회 2002 공업화학 Vol.13 No.5
경막형 용융 결정화와 sweating조작에 의하여 caprolactam-cyclohexanone계로부터 caprolactam의 분리 정제에 관한 연구가 수행되었다. 결정의 정제에 영향을 미치는 sweating 공정변수가 조사되었다. Sweating 공정의 정제속도식을 도출하여 sweating 공정의 메커니즘이 조사되었다. Sweating에 의한 불순물의 제거 속도는 결정 속에 포함된 내포용융액이 많을수록 높은 결정성장속도에서 얻어진 결정일 수록 높았다. Sweating에 의한 결정의 순도는 sweating 온도 및 부분 용융 정도에 크게 의존하였다. Sweating 결과로부터 경막결정화에 의하여 얻어진 결정에서 불순물은 대부분 결정층의 표면에 부착된 불순물이며 이는 sweating 조작에 의해 쉽게 제거될 수 있었다. Sweating 정제속도식에 의한 sweating 메카니즘 분석을 통하여 결정정제 속도가 비표 분석되었다. Sweating정제를 위한 온도는 포화온도의 6 ℃ 이내가 바람직하다. Sweating조작은 결정 속에 내포된 내포용융액의 분율을 1/4로 감소시킬 수 있었다. Sweating of crystalline layer obtained by melt crystallization from caprolactam-cyclohexanone system was studied. The sweating as an additional purification method after melt crystallization was quantitatively analyzed. Sweating parameters including temperature, time and crystalline conditions were investigated for purification of the crystaline layers. Separation effect of the sweating was higher with larger amount of impurity inclusions in the crystalline layer. Purity of the crystalline layer depended mainly on the sweating temperature. Purification rate equation can be used to analyze the sweating performance. The sweating can be applied as an effective process that can upgrade the crystal to very high purity. The temperature difference between saturation and sweating of below 6 K is recommendable. The fraction of inclusions entrapped in the crystalline layer can be reduced to one fourth by the sweating process.
무기 박막형 보호층을 이용한 고분자 유기발광 다이오드의 특성 평가
김훈,김광호,김재경,이윤희,한정인,도이미,주병권,Kim, Hoon,Kim, Kwang-Ho,Kim, Jae-Kyung,Lee, Yun-Hi,Han, Jeong-In,Do, Lee-Mi,Ju, Byeong-Kwon 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.1
In this study, the inorganic thin-film passivation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam evaporation system, the various kinds of inorganic thin-films were deposited onto the organic layer and their interface properties between organic and inorganic layer were investigated. In this investigation, the MgO layer showed the most suitable properties, and based on this result, the time dependent emission properties were estimated for the OLED with and without passivation layer. In this experiment, we can see that the time-dependent emission properties of MgO passivated OLED had longer life-time compared to non-passivated OLED. Therefore, we can consider that the MgO thin film is one of the most suitable candidates for the thin-film passivation layer of OLED.
경사증착법을 이용한 PM-OLED용 무기박막형 보호층 연구
김광호,김훈,김재경,도이미,한정인,주병권,Kim, Kwang-Ho,Kim, Hoon,Kim, Jae-Kyung,Do, Lee-Mi,Han, Jeong-In,Ju, Byeong-Kwon 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.9
In this study, the MgO thin-film passivation layer was adopted to protect passive matrix organic light emitting diode(PMOLED) with the cathode separator from moisture and oxygen. Using the substrate rotate and tilt technique during the deposition, the organic and cathode layers were perfectly covered with MgO. And then, we analyzed the difference of the current-voltage and luminescence characteristics between passivated OLED of the MgO and non-passivated OLED. It was found that the number of dark spot generated from the degradated pixel was decreased owing to the Mgo thin-film passivation layer using the tilt & rotate technique. And the half-life time passivated OLED was improved two times more. Thus, the MgO could be vaccum-deposited under the low temperature and had a merit that the organic layer was not much affected. We can consider that MgO thin film passivation method can be adopted to protect the OLED from moisture and oxygen and can offer the enhancement of lifetime.
여성취업률 지역별 차이에 관한 연구 - 결혼의 효과를 중심으로 -
이번송 ( Bun Song Lee ),장수명 ( Soo Myung Jang ),김재경 ( Jae Kwang Kim ) 한국경제학회 2003 經濟學硏究 Vol.51 No.1
In this paper, we examine the relationship between marital status and women`s labor force participation in Korea, and argue that marriage remains as a dominant obstacle to Korean women`s labor force participation and employment by causing women to break off the labor market. The average participation rate of married women aged between 21-30 is around 40 to 70 percent lower than that of single women of the same age group with high school graduates acoss six largest Korea cities. We argue that culture lags or slower changes in social norms toward married women in Korea with comparison to its rapid economic development can explain such low labor force participation among young married women. To test our hypothesis, two strategies are emplyed. First, we test whether individual demographic characteristics and local labor maket conditions are differently related to young women`s participation according to their martial status for those women aged between 21 and 30. Second, we examine whether income and substitution effects in married women`s labor force participation decisions are different across three different age groups: ages25-34, ages 35-44, and ages 45-60. By utilizing these strategies, we find that demand (firm`s demand for women`s labor) is more responsible for the low participation by young married women and supply (labor supply by women) is more responsible for the high participation by middle-aged married women.
Neural Network-based Decision Class Analysis with Incomplete Information
김재경,이재광,박경삼 한국데이타베이스학회 1999 공동학술대회 Vol.1 No.1
Decision class analysis (DCA) is viewed as a classification problem where a set of input data (situation-specific knowledge) and output data (a topological leveled influence diagram (ID)) is given. Situation-specific knowledge is usually given from a decision maker (DM) with the help of domain expert(s). But it is not easy for the DM to know the situation-specific knowledge of decision problem exactly. This paper presents a methodology for sensitivity analysis of DCA under incomplete information. The purpose of sensitivity analysis in DCA is to identify the effects of incomplete situation-specific frames whose uncertainty affects the importance of each variable in the resulting model. For such a purpose, our suggested methodology consists of two procedures: generative procedure and adaptive procedure. An interactive procedure is also suggested based the sensitivity analysis to build a well-formed ID. These procedures are formally explained and illustrated with a raw material purchasing problem.
Neural Network - based Decision Class Analysis with Incomplete Information
김재경,이재광,박경삼 한국지능정보시스템학회 1999 한국지능정보시스템학회 학술대회논문집 Vol.1 No.1
Decision class analysis (DCA) is viewed as a classification problem where a set of input data (situation-specific knowledge) and output data (a topological leveled influence diagram (ID)) is given. Situation-specific knowledge is usually given from a decision maker (DM) with the help of domain expert(s). But it is not easy for the DM to know the situation-specific knowledge of decision problem exactly. This paper presents a methodology for sensitivity analysis of DCA under incomplete information. The purpose of sensitivity analysis in DCA is to identify the effects of incomplete situation-specific frames whose uncertainty affects the importance of each variable in the resulting model. For such a purpose, our suggested methodology consists of two procedures: generative procedure and adaptive procedure. An interactive procedure is also suggested based the sensitivity analysis to build a well-formed ID. These procedures are formally explained and illustrated with a raw material purchasing problem.