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연구논문 : 곤약의 최적 응고 및 항미생물 활성을 위한 조건 확립
심재인 ( Jae In Sim ),최선정 ( Seon Jeong Choi ),정재현 ( Jae Hyun Jeong ),최웅규 ( Ung Kyu Choi ) 한국식생활문화학회 2014 韓國食生活文化學會誌 Vol.29 No.5
This study was conducted to establish optimum conditions for coagulation of konjac jelly as well as antimicrobial activity by concentration of Ca(OH)2. Hardness, gumminess, and chewiness of konjac jelly increased according to concentration of konjac powder. A Ca(OH)2 concentration of 0.4-0.6% as a coagulation agent was optimum for coagulation of konjac jelly. Further, sensory score was highest at a Ca(OH)2 concentration of 0.6%. All populations of bacteria, yeast, and mold in konjac jelly were restrained by Ca(OH)2 concentration-dependent manner. Furthermore all tested microoraganisms were strictly restrained at 1.0x10-2 N of Ca(OH)2.
증착방법에 따른 Al 피막의 증착율 및 증기분포에 관한 연구
정재인(Jae-In Jeong),정우철(Woo-Chul Jung),손영호(Young-Ho Son),이득진(Deuk-Jin Lee),박성렬(Serng-Yerl Park) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.3
진공증착 및 이온플레이팅 방법을 이용하여 냉간 압연된 강판상에 알루미늄 피막을 형성시킨 후, 증 발율 및 증기분포 변화를 측정하고 각 증착방법에서의 증발율에 따른 증기분포 변화를 비교 및 검토하였다. 본 실험에서의 이온플레이팅은 증발원 근처에 이온화전극을 설치하는 방법으로 고전류 아크 방전을 유도하여 10^(-4) Torr 이하에서도 기존의 이온플레이팅에 비해 높은 이온화율을 얻을 수 있는 아크방전 유도형 이온플레이팅(Arc-induced Ion Plating; AIIP) 방법을 이용하였다. 전자빔을 이용하면서 알루미나 크루시블을 사용하여 알루미늄을 증발시킬 경우 분당 2.0 ㎛이상의 높은 증발율을 얻을 수 있었으며, 이온플레이팅의 경우 이온화된 증기의 상호작용에 따른 산란 효과로 증발율이 다소 낮아짐을 알 수 있었다. cos^nφ로 이루어지는 증기분포의 결정인자(n)의 값이 진공증착의 경우는 1에 근접하는 것으로 나타났고 AIIP의 경우는 2 또는 그보다 더 큰 값으로 이루어지는 것을 확인하였다. 이로부터 이온플레이팅의 경우 이온화율 또는 기판 바이어스 전압의 효과가 다른 조건에 비해 증기분포에 더 크게 영향을 미치는 것을 확인할 수 있었다. Al films on cold-rolled steel sheet have been prepared by vacuum evaporation and arc-induced ion plating, respectively, and the evaporation rate and vapor distribution (thickness distribution over the substrate) have been investigated according to deposition conditions. The arc-induced ion plating (AIIP) method have been employed, which makes use of arc-like discharge current induced by ionization electrode located near the evaporation source. The AIIP takes advantage of high ionization rate compared with conventional ion plating, and can be carried out at low pressure of less than 10^(-4) torr. Very high evaporation rate of more than 2.0 ㎛/min could be achieved for Al evaporation using alumina liner by electron beam evaporation. The geometry factor n for the cos^nφ vapor distribution, which affects the thickness distribution of films at the substrate turned out to be around 1 for vacuum evaporation, while it features around 2 or higher for ion plating. For the ion plated films, it has been found that the ionization condition and substrate bias are the main parameters to affect the thickness distribution of the films.
대향류 확산 화염 중에서 비구형 입자 성장에 관한 해석
정재인,황준영,이방원,최만수,정석호,Jeong, Jae In,Hwang, Jun Young,Lee, Bang Weon,Choi, Mansoo,Chung, Suk Ho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8
Silica particle formation and growth process including chemical reaction, coagulation and sintering was studied in a counterflow diffusion flame burner. The counterflow geometry provides a one dimensional flow field, along the stagnation point streamline, which greatly simplifies interpretation of the particle growth characteristics. $SiCl_4$ has been used as the source of silicon in hydrogen/oxygen/argon flames. The temperature profiles obtained by calculation showed a good agreement with experiment data. Using one and two dimensional sectional method, aerosol dynamics equation in a flame was solved, and these two results were compared. The two dimensional section method can consider sintering effect and growth of primary particle during synthesis, thus it showed evolution of morphology of non-spherical particles (aggregates) using surface fractal dimension. The effects of flame temperature and chemical loading on particle dynamics were studied. Geometric mean diameter based on surface area and total number concentration followed the trend of experiment results, especially, the change of diameters showed the sintering effect in high temperature environment.
정재인,최만수,Jeong, Jae-In,Choi, Man-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
A simple model for describing the non-spherical particle growth phenomena has been developed. In this model, we solve simultaneously particle volume and surface area conservation sectional equations that consider particles' non-sphericity. From the correlation between two conserved properties of sections, we can predict the evolution of the aggregates' morphology. This model was compared with a simple monodisperse-assumed model and more rigorous two-dimensional sectional model. For comparison, formation and growth of silica particles have been simulated in a constant temperature reactor environment. This new model showed good agreement with the detailed two-dimensional sectional model in total number concentration and primary particle size. The present model successfully predicted particle size distribution and morphology without costing very heavy computation load and memory needed for the analysis of two dimensional aerosol dynamics.
곤약 가공을 위한 응고제 선정 및 식중독균에 대한 항균 활성 확인
심재인,최선정,정재현,최웅규,Sim, Jae-In,Choi, Seon-Jeong,Jeong, Jae-Hyun,Choi, Ung-Kyu 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.4
본 연구에서는 곤약 가공을 위한 응고제와 침지액을 선정하고, 침지액 농도에 따른 식중독균에 대한 항균 활성을 확인하였다. 응고제 종류에 따른 곤약의 응고시간별 물성 변화는 응고액의 종류에 관계없이 응고시간이 진행될수록 경도, 검성 및 씹힘성이 증가하였다. 응고제 종류에 따른 곤약의 무기질 함량은 응고제가 $Ca(OH)_2$일 경우, NaOH를 이용한 곤약보다 유의적으로 높은 Ca 함량을 나타내었으며, 응고제가 NaOH일 경우에는 $Ca(OH)_2$보다 유의적으로 높은 Na 함량을 나타내었다. Mg와 P의 경우에는 응고제의 종류에 따른 유의적 차이는 보이지 않았다. 관능검사에서 색, 향, 맛, 조직감 및 전반적인 기호도는 응고제의 종류에 따른 유의적 차이는 없었다. 곤약의 제조과정 중 식중독균인 Staphylococcus aureus, E. coli, Salmonella typhimurium을 접종하여 $Ca(OH)_2$ 농도에 따른 항균 활성을 본 결과, $1.0{\times}10^{-4}N$ 용액에 저장한 곤약이 가장 항균 활성이 적었으며, $1.0{\times}10^{-2}N$ 농도가 가장 항균 활성이 높았다. 즉, 응고액의 농도에 비례하여 균 성장이 억제됨을 확인할 수 있었다. 제조 공정 별 미생물 변화는 구약감자 분말을 입고하여 저장시켰을 때 미생물 수가 약간 증가하지만, 그 이후 공정부터는 미생물 수가 급격하게 감소되며, 성형 이후부터는 검출되지 않는 것으로 확인되었다. This study was conducted to select the coagulant for konjac processing and to identify the antibacterial activity on foodborn pathogens by concentration of $Ca(OH)_2$. In rheological properties such as hardness, gumminess and chewiness, konjac jelly were increased by progressing coagulation regardless of coagulant. In mineral contents, the Ca content of konjac jelly made with $Ca(OH)_2$ was significantly higher than that of NaOH. On the contrary, the Na content of konjac jelly made with NaOH coagulant was significantly higher than that of $Ca(OH)_2$. There were no significant differences in the Mg and P contents according to coagulant. In sensory evaluation, there were no significant differences in the color, flavor, taste, texture and overall quality according to coagulant. The antimicrobial activities of Staphylococcus aureus, E. coli, Salmonella typhimurium were inhibited in proportion to the concentration of $Ca(OH)_2$. According to the manufacturing process of konjac jelly, the change in microorganism was not found after molding.
용융알루미늄 도금 강판 상에 스퍼터링법으로 형성된 마그네슘 코팅막에 의한 내식성 향상
박재혁(Jae-Hyeok Park),김순호(Soon-Ho Kim),정재인(Jae-In Jeong),양지훈(Ji-Hoon Yang),이경황(Kyung-Hwang Lee),이명훈(Myeong-Hoon Lee) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.4
In this study, Mg films were prepared on hot dip aluminized steel (HDA) by using a sputtering method as a high corrosion resistance coating. The corrosion resistance of the Mg films was improved by controlling the morphology and the crystal structure of films by adjusting the Ar gas pressure during the coating process. Anodic polarization measurement results confirm that the corrosion resistance of the Mg films was affected by surface morphology and crystal structure. The corrosion resistance of the Mg coated HDA specimen increased with decreasing crystal size of the Mg coating and it was also improved by forming a film with denser morphology. The crystal structure oriented at Mg(101) plane showed the best corrosion resistance among crystal planes of the Mg metals, which is attributed to its relatively low surface energy. Neutral salt spray test confirmed that corrosion resistance of HDA can be greatly improved by Mg coating, which is superior to that of HDG (hot dip galvanized steel). The reason for the improvement of the corrosion resistance of Mg films on hot dip aluminized steel was due to the barrier effect by the Mg corrosion products formed by the corrosion of the Mg coating layer.