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김중배,방병호,Kim, Jung-Bae,Bang, Byung-Ho The Korean Society of Food and Nutrition 2014 韓國食品營養學會誌 Vol.27 No.3
황백(Cortex Phellodendri: CP)은 황벽나무(Phellodendron amurense)의 건조된 수피로부터 얻어진다. 이 수피는 한국의 전통 한약제로서 설사, 황달, 무릎과 발의 통증, 요도관 및 피부 감염증에 폭넓게 사용되어 왔다. 이들 기능성 성분의 분리 및 정제는 박층 크로마토크래피, 컬럼 액체 크로마토크래피 및 HPLC와 같은 여러 분석법들이 동양의 약초연구에 이용되어 왔다. 본 연구는 CP로부터 berberine을 분리하기 위해 향류분배 크로마토크래피법(CPC)으로 효과적으로 수행하였다. 두 용매의 CPC 최적조성은 n-butanol: acetic acid: water(4:1:5 v/v/v)이었다. 이동상의 유속은 1,000 rpm 회전력에서 상승법으로 분당 3 mL 속도로 전개시켰다. CPC에서 분리된 분획분은 prep-HPLC로 정제하였다. $^1H$-NMR 스펙트럼은 4.10과 4.20 ppm에서 $3H(-OCH_3)$, 6.10 ppm에서 2H의 ($-OCH_2O-$) proton signal의 공명이 관찰되었다. 2개의 방향족 proton은 이중결합 패턴을 보였다. H-11과 H-12 doublet은 각각 7.98과 8.11에서 나타났다. $^{13}C$-NMR 스펙트럼에서는 C2와 C3의 methylenedioxy group($-OCH_2O-$), C9과 C10에 methoxy group($-OCH_3$)이 4개의 치환된 형태로 보였다. 분리 정제된 berberine의 화학구조는 $^1H$, $^{13}C$-NMR, ESI-MS 데이터 분석으로 확인하였다. Cortex Phellodendri (CP) is derived from the dried bark of Phellodendron amurense. It has been widely used as a drug in traditional Korea medicine for treating diarrhea, jaundice, swelling pains in the knees and feet, urinary tract infections, and infections of the body surface. Many analytical methods have been used to study oriental herbal medicines, such as thin-layer chromatography, column liquid chromatography, and high performance liquid chromatography (HPLC). In this study, preparative centrifugal partition chromatography (CPC) was successfully carried out in order to separate pure compounds from a CP methanol extract. The optimum two-phase CPC solvent system was composed of n-butanol: acetic acid: water (4:1:5 v/v/v). The flow rate of the mobile phase was 3 mL/min in ascending mode with rotation at 1,000 rpm. The CPC-separated fraction and purification procedures were carried out by preparatory HPLC. The $^1H$ NMR spectrum revealed that the resonances at ${\delta}$ 4.10 and 4.20 ppm corresponded to three protons ($-OCH_3$), whereas those at ${\delta}$ 6.10 ppm corresponded to two protons ($-OCH_2O-$). Further, two aromatic protons (H-11 and H-12) conveys a doublet-doublet pattern. The H-11 doublet and H-12 doublet appear at ${\delta}$ 7.98 and 8.11, respectively. The $^{13}C$ NMR. spectrum showed a tetrasubstituted with a methylenedioxy group at C2 and C3, and two methoxy groups at C9 and C10. The chemical structure of the berberine was identified by $^1H$, $^{13}C$-nuclear magnetic resonance and electrospray ionization-mass spectroscopy spectral data analysis.
김재우(Jae Woo Kim),김명호(Myung Ho Kim),김중배(Jung Bae Kim),김성훈(Sung Hoon Kim),박찬규(Chan Kyu Park) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅰ
본 논문에서는 C++ 언어를 이용한 부품 개발 과정에서 단정문을 체계적으로 활용할 수 있도록 하는 기능을 제안하였다. 제안된 기능은 Eiffel의 Design-by-Contract 시스템과 유사하게 동작하도록 C++ 언어의 객체 모델을 이용하여 구현되었으며 별도의 소프트웨어 없이 라이브러리 형태로 간편하게 사용할 수 있도록 설계하였다. 또한 이를 C++의 표준라이브러리를 사용하여 실험적으로 구현하였다. 제안된 기능을 사용하는 경우 단정문 처리를 위한 복잡한 코드가 추상화되어 실제 프로그램 코드와 체계적으로 분리되므로 작성된 프로그램을 문서화하고 개발된 부품의 유지보수를 용이하게 한다.
김계경(Kye-Kyung Kim),강상승(Sang-Seung Kang),이재연(Jae-Yeon Lee),김중배(Joong-Bae Kim),김재홍(Jae-Hong Kim),김진호(Jin-Ho Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
In this paper, object recognition using multiple local features and classifier has applied for automating manufacturing system. Object recognition has challenged in real world application field because of illumination effect and complicate background. We have enhanced accuracy of object recognition using multiple local features, which are used to detect object location and to estimate pose. Local feature classifier using NN has used to obtain more reliable object recognition rate. The proposed object recognition method has evaluated in pilot system, in which we have tested object detection rate and pose estimation rate of randomly piled objects. And also, we have tested object recognition accuracy on database captured in real world environment, which has various lighting condition and time passing.
김중배 ( Joong-bae Kim ),김영훈 ( Young-hoon Kim ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.4
In this study the dynamic characteristic of a composite beam is analyzed. It is composed of SPCC metal beam and visco-elastic pad (asphalt). The well-known Oberst beam test is carried out to get the material properties of the visco-elastic material. The RKU equation is applied to the measured data from the Oberst beam test to get the equivalent properties of the composite beam, and the results are used to analyze the equivalent beam model. The frequency dependent elastic or shear modulus and the corresponding loss factor of a visco-elastic material are considered in numerical analysis. The results of the analysis are compared with the experimental analysis. The results of both analyses show so good agreement with each other that the method of numerical analysis for the highly non-linear material structure is proposed for the similar system.
열 유속차를 이용한 수소저장합금 분말의 열전도도 측정 기법
김중배(Joong Bae Kim),노진성(Jinsung Rho),이봉재(Bong Jae Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This study proposes a technique for measuring the thermal conductivity of powdered metal hydride. The proposed technique was verified through numerical simulation and uncertainty analysis, and its applicability was evaluated by implementing it as an actual apparatus. In order to overcome the problems such as requiring a large amount of sample and long measuring time of the Guarded Hot Plate method, the scale of the device was drastically reduced, and feedback control was applied in this study. In addition, it contributed to increasing the repeatability of measurement by adopting a case that can accurately contain powder samples in the repeated measurements. As a result, it got to be possible to precisely measure the effective thermal conductivity of metal hydrides using the proposed technique.