http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
HMX 결정 표면에 NTO 결정의 응집현상에 관한 연구
김광주 ( Kwang Joo Kim ),서현호 ( Hyoun Ho Seo ) 한국공업화학회 2003 공업화학 Vol.14 No.2
Cyclotetramethylene tetraitramine (HMX) 결정 표면에 3-nitro-1,2,3-triazole-5-one(NTO) 결정을 응집시키는 연구가 회분식 냉각 결정화기에서 수행되었다. 용액에서 NTO 결정 생성에 대한 2차핵생성속도와 응집속도가 결정화 조업조건에 따라 on-line 분석되었다. 종을 이용한 2차핵생성에서 과포화가 응집을 형성시키는데 가장 중요한 인자였다. 종의 농도, 과포화도, 교반속도 등의 실험변수가 조사되었다. NTO의 2차 핵생성속도는 종의 농도가 증가함에 따라 증가하였다. HMX 결정표면에 응집 메커니즘은 othorkinetic 메커니즘과 일치하며 과포화의 3.2승 및 입자수의 2승에 의존하였다. 결과적으로 둔감화약과 민감화약의 응집은 화약의 민감성을 감소시키는 방법이 될 수 있다. Agglomeration between 3-nitro-1,2,4-triazole-5-one (NTO) and cyclotetramethylene tetranitramine (HMX) crystals was investigated in a batch cooling crystallizer. Secondary nucleation rate and agglomeration rate were measured directly during the crystallization. In the secondary nucleation using a seed, the supersaturation was the most important parameter in producing the agglomerated particles. The influences of concentration of HMX seeds, supersaturation, and agitation rate were discussed. The secondary nucleation of NTO crystals by seeding MMX crystals increased as the seed concentration increased. The agglomeration kinetic was correlated with the 3.2nd power of the solution supersaturation and the 2rf power of the number of the suspended particles. Othorkinetic mechanism was found in the agglomeration between NTO and HMX crystals. The agglomeration between insensitive and sensitive explosives may be a method to reduce the sensitivity of explosive compounds.
졸-겔 방법을 이용하여 제작된 (Mn, Cr)xCo₁-xFe₂O₄ 박막의 구조적, 자기적 특성
김광주(Kwang Joo Kim),김희경(Hee Kyung Kim),박영란(Young Ran Park),박재윤(Jae Yun Park) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
By substituting Mn or Cr for Co in inverse spinel CoFe₂O₄, MnxCo₁-xFe₂O₄ and CrxCo₁-xFe₂O₄ thin films were prepared by sol-gel method and their structural and magnetic properties were investigated. X-ray diffraction indicates that the cubic lattice constant increase for the Mn substitution while it hardly changes for the Cr substitution. Substitution of Mn²+ for octahedral Co²+ sites can explain the increase of lattice constant in MnxCo₁-xFe₂O₄. On the other hand, Substitution of Cr³+ for octahedral Co²+ and subsequent reduction of Fe³+ ion into Fe²+ are expected to happen. Mossbauer spectroscopy measurements on CrxCo₁-xFe₂O₄ indicate the existence of tetrahedral Fe²+ ions that are created through reduction of tetrahedral Fe³+ ions in order to compensate charge imbalance happened by Cr³+ substitution for octahedral Co²+ sites. On the other hand, no Fe²+ ions were detected by Mossbauer spectroscopy for MnxCo₁-xFe₂O₄. A migration of Fe³+ ions from octahedral to tetrahedral sites in MnxCo₁-xFe₂O₄ was detected by Mossbauer spectroscopy for x>0.47. Vibrating sample magnetometry measurements on the samples at room temperature revealed that the saturation magnetization increases by Mn and Cr substitution for certain range of x, qualitatively explainable in terms of the comparison of spin magnetic moment among the related transition-metal ions.
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.
공사중단 방치건축물의 정비 및 활용을 위한 법·제도 분석
김광주(Kim,Kwang-Ju),이만형(Lee,Man-Hyung),이재우(Lee,Jae-Woo) 한국지역개발학회 2011 한국지역개발학회 세미나 논문집 Vol.2011 No.1
Confronted with the upcoming depopulation era,the numberofthe abandoned buildings has shown ever-increasing trends in Korea.These abandoned buildings are regarded as the typical social stigma, exerting negative impact on the various social issues. After diagnosing the status quo of abandoned buildings,this research focuses on legaland institutional aspects in order to devise alternative options.In specific,it tries to suggest a series of improvement measures geared towards arrangement or reuse of the abandoned buildings,primarily reflecting the present physical conditions and legal ownership.
지방자치단체에서 GIS 구축에 따른 비용편익분석 : 대구광역시를 사례로
김광주(Kwang Ju Kim),조명희(Myung Hee Jo),박상우(Sang Woo Park) 한국지리정보학회 1999 한국지리정보학회지 Vol.2 No.2
Using the case of Taegu city, this study analysis benefits and costs related to the construction of GIS to local government. For this purpose, the study uses a case study selecting Taegu Metropolitan city. In this study, four discount rates(5%, 8%, 10%, 1
공사중단 방치건축물의 정비 및 활용을 위한 법·제도 분석
김광주(Kim Kwang-Ju),이만형(Lee Man-Hyung),이재우(Lee Jae-Woo) 한국지역개발학회 2011 한국지역개발학회 학술대회 Vol.2011 No.6
Confronted with the upcoming depopulation era, the number of the abandoned buildings has shown ever-increasing trends in Korea. These abandoned buildings are regarded as the typical social stigma, exerting negative impact on the various social issues. After diagnosing the status quo of abandoned buildings, this research focuses on legal and institutional aspects in order to devise alternative options. In specific, it tries to suggest a series of improvement measures geared towards arrangement or reuse of the abandoned buildings, primarily reflecting the present physical conditions and legal ownership.
김광주(K . J . Kim),복정홍도(H . Fukui),조명희(M . H . Jo),이해영(H . Y . Lee) 한국지리정보학회 2001 한국지리정보학회지 Vol.4 No.2
The Purpose of this study is to provide an effective way of developing GIS to UIS at the local level. For this purpose, the study typologically reviews the developing processes of UIS and utilizes a case study as research method. As the case, the study selects three types of UIS such as FM based UIS (Kwacheon), Urban Planning based UIS (Cheungju), and LIS based UIS (Taegu Nam-Gu). Based on these three UISs, the study concludes as follows. First, the developing process of GIS to UIS began with isolated approach through integrated model and finally to internet UIS. Second, UISs follows similar processes to that of GIS construction. Third, local governments focus on the development of FM based UIS of which construction budget is financed by the central government. Based on these findings, the study provides policy alternatives for the successful construction of UIS.