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郭庚度,朴柄珏,金鎬順,徐萬哲,金鐘大 嶺南大學校附設 基礎科學硏究所 1988 基礎科學硏究 Vol.8 No.-
The electronic states of the antimicrobial phenzine and its derivatives were examined by Extended H?uckel Method. It was found that the sum of nucleophilic reactivity index for trans 1,2, and 4 positions, ?? in a molecule was found to be related antimicrobial activity. The index, ??, should be applied to biological activity as well as antimicrobial activity.
반응표면을 활용한 통계적 모멘트 추정 방법과 신뢰도해석에 적용
허재성(Jae-Sung Huh),곽병만(Byung-Man Kwak) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A new and efficient method for estimating the statistical moments of a system performance function has been developed. The method consists of two steps: (1) An approximate response surface is generated by a quadratic regression model, and (2) the statistical moments of the regression model are then calculated by experimental design techniques proposed by Seo and Kwak⑷. In this approach, the size of experimental region affects the accuracy of the statistical moments. Therefore, the region size should be selected suitably. The D-optimal design and the central composite design are adopted over the selected experimental region for the regression model. Finally, the Pearson system is adopted to decide the distribution type of the system performance function and to analyze structural reliability.
유제품 및 식품 분석 업무의 중요성 (분석학자의 관점)
곽병만 ( Byung-man Kwak ) 한국낙농식품응용생물학회(구 한국유가공학회) 2020 Journal of Dairy Science and Biotechnology (JMSB) Vol.38 No.4
Processes that products we consume that contain dairy foods comprise planning → design → production → quality/suitability assessment → safety verification → launch → distribution → consumption. Analysis of nutrients and potential toxins at each stage in the production process is essential to verify food quality, suitability, and safety. Products display ingredient lists and nutrient content to help consumers choose healthy foods. These products should also be fully assessed for microbes and toxins before reaching consumers. Products require verification through test inspections. However, this step has reduced value from a food manufacturer's viewpoint, because it does not visibly impact real economic trends. The most important first step in determining the quality and suitability of products is the inspection capability of food companies.
안장혁,Byung-Man Kwak,박정민,Na-Kyeoung Kim,김진만 한국축산식품학회 2014 한국축산식품학회지 Vol.34 No.6
A rapid and simple analytical method for L-carnitine was developed for infant and toddler formulas by liquid chromatog-raphy tandem mass spectrometry (LC-MS/MS). A 0.3 g of infant formula and toddler formula sample was mixed in a 50 mLconical tube with 9 mL water and 1 mL 0.1 M hydrochloric acid (HCl) to chemical extraction. Then, chloroform was usedfor removing a lipid fraction. After centrifuged, L-carnitine was separated and quantified using LC-MS/MS with electro-spray ionization (ESI) mode. The precursor ion for L-carnitine was m/z 162, and product ions were m/z 103 (quantitative)and m/z 85 (qualitative), respectively. The results for spiked recovery test were in the range of 93.18-95.64% and the resultfor certified reference material (SRM 1849a) was within the range of the certificated values. This method could be imple-mented in many laboratories that require time and labor saving.
개선된 현수 방정식과 접촉 역학을 이용한 일반적 궤도 구동시스템의 해석
윤병동(Byung Dong Youn),곽병만(Byung Man Kwak) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
The analysis of general tracked systems under track length constraint is known difficult. Analytical approach has not been tried yet for this class of probleme due to the complex nature of the track which is weak in bending and strong in tension.<br/> In this paper. The initial configuration of a tracked system is modeled as fitting an inextensible track into an arbitrary suspension system composed of springs and masses. The loading conditions are taken into account analytically by utilizing a modified catenary equation (MCE). The information for external loading is calculated using a frictional contact problem formulation. The MCE is shown viable by comparing the results with those of the catenary and the parabolic equation used up to now.<br/> A simple dynamic example with a constant velocity was considered. The overall reaction forces are calculated using the MCE. The results of this procedure are favorably compared with those obtained previously in the recent literature. The present results on the dynamic behavior are shown to match well with engineering intuitions.<br/>