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Jinbong Hwang,Hae Won Jang,Bae Namgung,Mira Oh,Soyoung Kim,Dongwon Seo,Se-Na Kim,Youngmin Choi,Jin-Sik Nam,Mi-Ok Yang 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.2
The analytical method for the determination of phosphorus in foods was validated by inductively coupled plasma optical emission spectrometry (ICP-OES) in terms of precision, accuracy, recovery efficiency and linearity. Regression analysis revealed good correlation coefficient, higher than 0.999. Recovery efficiencies of the minerals ranged from 90.36% to 110.63%, and the limit of detection (LOD) and the limit of quantification (LOQ) were 0.0745 mg/ kg and 0.2482 mg/kg, respectively. The value of inter-day and intra-day ranged from 1.43 to 3.23% and from 0.40 to 1.77%. The recovery efficiencies ranged from 97.8 to 110.6%. The method was also compared with Molybdenum blue colorimetric method using certified and statistically significant difference was also not observed in the between two different analytical methods. The ICP-OES method was applied to phosphorus determination in commonly consumed foods. The obtained results suggest that the method verified in the present study may be used as an official analytical method for clear understanding of phosphorus database for national health promotion.
Size distribution analysis of airborne wear particles released by subway brake system
Namgung, H.G.,Kim, J.B.,Kim, M.S.,Kim, M.,Park, S.,Woo, S.H.,Bae, G.N.,Park, D.,Kwon, S.B. Elsevier Sequoia [etc.] 2017 Wear: An international journal on the science and Vol.372 No.-
<P>Contributions of exhaust and non-exhaust sources to traffic-related particulate matter (PM) pollution in the atmosphere are almost identical and the most important non-exhaust source is known to be brake wear particles. In order to understand the properties and harmful effects of wear particles on people, accurate information on size distribution of brake wear particles is needed. Our previous study investigated the measured changes in size distribution of nanoparticles of 500 nm or smaller to understand the origin of nanoparticles due to temperature increases on the friction surface. The present study was intended to investigate the characteristics of size distribution (5.6 nm-32 mu m) of PM released under different braking conditions by using different instruments. The measurement results under 9 braking conditions using 3 different instruments showed that the size distribution chatacteristics of particles can be divided into two main types according to braking energy. The first type is of PM up to 10 mu m in size and with a peak number concentration at 0.2-0.75 mu m regardless of braking energy, while the second type is of PM around 10 nm in size generated only when braking energy increased and particles that increased up to 100 nm. In addition, we found that the size distributions measured by the optical particle counter (OPC) and the aerodynamic particle sizer (APS) were consistent by assuming a mean diameter ratio of two instruments. (C) 2016 Elsevier B.V. All rights reserved.</P>
Cloning and characterization of chitin synthase gene fragments from Penicillium chryspgenum
Jun, Namgung,Park, Bum Chan,Lee, Dong Hoon,Bae, Kyung Sook,Park, Hee-Moon 충남대학교 생물공학연구소 1997 생물공학연구지 Vol.5 No.-
DNA fragments homologous to chitin synthase were amplified from the genomic DNA of Penicillium chrysogenum by PCR. Cloning and sequencing of the PCR-amplified fragments led to the identification of four different genes, designated PcCHS1, PcCHS2, PcCHS3, and PcCHS4. By comparison of the deduced amino acid sequences, PcCHS1 was identified as a gene for classⅠ chitin synthase, PcCHS2 and PcCHS3 were for classⅡ, and PcCHS4 was for classⅢ. Among these only PcCHS4 includes an intervening sequence of 56 bp. The analysis of the deduced amino acid sequences revealed a close evolutionary relationship between Penicillium and ascomycetous fungi.
Microfluidic device for sheathless particle focusing and separation using a viscoelastic fluid
Nam, J.,Namgung, B.,Lim, C.T.,Bae, J.E.,Leo, H.L.,Cho, K.S.,Kim, S. Elsevier 2015 Journal of chromatography Vol.1406 No.-
Continuous sheathless particle separation with high efficiency is essential for various applications such as biochemical analyses and clinical diagnosis. Here, a novel microfluidic device for highly efficient, sheathless particle separation using an elasticity-dominant non-Newtonian fluid is proposed. Our device consists of two stages: sheathless three-dimensional focusing (1 st stage) and separation (2nd stage). It is designed based on the principle of a viscoelasticity-induced particle lateral migration, which promises precise separation of particles in a microfluidic device. Particles of 5- and 10-μm diameters were all focused at the centerline of a circular channel at the 1st stage and successfully separated at the 2nd stage with an efficiency of ~99.9% using size-based lateral migration of particles induced by the viscoelasticity of the medium. We also demonstrated the capability of our device for separation of blood cells into multiple fractions. The tunability of separable particle size could be achieved by changing the viscoelastic property of the medium and flow rate.
마이크로 연마 필름을 이용한 SM45C 의 경면 연마 가공에 관한 연구
김홍배(Hong Bae Kim),김기수(Ki Soo Kim),남궁석(Suk Namgung) 대한공업교육학회 1997 대한공업교육학회지 Vol.22 No.1
The ultra-precision machining is widely used for final machining process of precision parts. Therefore, in this study, mirror surface roughness characteristics is examined by mirror surface finishing system using the micro abrasive film which is one of the ultra-precision machining method, and evaluated under the conditions varing film feed rate, applied force, and grinding speed It was found that various machining conditions have significant influences on surface roughness. Setting the grinding speed, film feed, and applided force as machining variable parameters in abrasive film finishing, the surface roughness value is seriously decreased as decreasing abrasive grain size, such as 30, 15, 12, and 9㎛. On the contrary, it is increased as decreasing those size 5 and 3㎛. After turing SM45C, it is grinded using the abrasive film of 30, 15, 12, 9, 5, and 3㎛ in order. Finally, the best result of surface roughness value, 0.003-0.005㎛Ra, can be obtained in the abrasive film of 9㎛.