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朴重坤 경북대학교 공과대학 1985 工大硏究誌 Vol.14 No.-
The flow distributions in the hollow fiber module were investigated numerically with the modified finite difference scheme. The non-uniformity in the flows through the fibers depended on the manifold design, the Reynolds number, the packing density and the pressure drop along the fibers. With the conical manifolds, local minimum velocities occur in the fibers near the center and at the periphery of the fiber module. With the cylinderical manifolds, local minimum velocity occurs only in the fiber near the center. These phenomena become more significant with the smaller pressure drop through one fiber and the higher Reynolds number. The performance of the hollow fiber reactor due to the non-uniform flow distribution in the fiber module was also investigated. The performance of the hollow fiber reactor was defined as the ratio of mass transfer rate in the reactor with non-uniform fluid distribution to that of the reactor in which the fluid flows equally through all fibers. The reactor with the cylinderical manifolds was superior to that with the conical manifolds in the view of the performance of the reactor. This phenomena became more prominent at higher Reynolds number and lower manifold height.
朴重坤,李泰宗 경북대학교 공과대학 1986 工大硏究誌 Vol.15 No.-
The use of the series equation developed by Chang and Park into Werynski equation is examined for dialyzer clearance with use of ultrafiltration. This method does not require data of concentration of solute in blood at the outlet of dialyzer which has been so far predicted to use the Werynski equation. The deviations of predicted clearnace from experimental data was within 0.5% with low molecular weight solute(below M. W. 200). Therefore, dialyzer clearance due to ultrafiltration can be accurately predicted, without experiments, from known diffusive clearance, using the formulation developed in this study.
朴重坤,金俊均 慶北大學校 1991 論文集 Vol.51 No.-
Hollow fiber reactor is used as hollow fiber bioreactors for cells and enzymes, reverse osmosis, artificial kidney and uranium extraction. Agish has shown experimentally the existence of flow nonuniformity among the embedded fibers. Recently a numerical method to calculate the velocity distribution in the module without ultrafiltration and the nonuniformity was verified experimentally. In this study the pressure drop in the tube with ultrafiltration was investigated to develop the computational algorithm for the nonuniformity in the module with ultrafiltration. The Hagen Poiseuille equation which has been used to calculate the pressure drop in the tube was not proper in this system and the pressure was increased with the extent of ultrafiltration.
한천, Sodium Alginate 및 Carrageenan첨가가 유과(부수게)바탕의 품질에 미치는 영향
김중만,전예정,박효숙,송영애,백승화,김명곤 한국식생활문화학회 2005 韓國食生活文化學會誌 Vol.20 No.1
This study was to evaluate effects of agar, sodium alginate and carrageenan on quality of Yugwa(Busuge) base. In the base preparation agar, sodium alginate and carrageenan were added 0.0, 0.1, 0.5, 1.0 and 3.0%(w/w), respectively. Volume, shape, hardness. color(L, a and b value), crude lipid content and sensory evaluation(taste and crispness) of the Yugwa base was measured. Volume of the base was higher than control in case of 0.1~0.5%(w/w) agar, sodium alginate and carrageenan, of which sodium alginate was the highest. Shapes were similar to control. Hardness and crude lipid content was decreased proportional to amount of addition of the three seesweed polysaccharides. the whiteness(L-value) was increased but the yellowness(a-value) and the redness(bvalue) decreased. Taste and crispness were increased in the case of 0.1~1.0%(w/w) of sodium alginate, but agar and carrageenan decreased.
The Recovery of Heavy Metals Using Encapsulated Microbial Cells
Park, Joong-Kon,Jin, Yong-Biao,Park, Hyung-Woo The Korean Society for Biotechnology and Bioengine 1997 Biotechnology and Bioprocess Engineering Vol.2 No.2
We prepared capsules containing Saccharomyces cerevisiae and Zoogloea ramigera cells for the removal of lead(II) and cadmium ions. Microbial cells were encapsulated and cultured in the growth medium. The S.cerevisiae cells grown in the capule did not leak through the capsule membrane. The dried cell density reached to 250 g/l on the basis of the inner volume of the 2.0 mm diameter capsule after 36 hour cultivation. The dry whole cell expolymer density of encapsulated Z.ramigera reached to 200 g/L. The capsule was crosslinked with triethylene tetramine and glutaric dialdehyde solutions. The cadmium uptake of encapsulated whole cell expolymer of Z.ramigera was 55mg Cd/g biosorbent. The adsorption line followed well Langmuir isotherm. The lead uptake of the encapsulated S. cerevisiae was about 30 mg Pb/g biomass. The optimum pH of the lead uptake using encapsulated S. cerevisiae was found to be 6. Freundlich model showed a little better fit to the adsorption data than Langmuir model 95 percent of the lead adsorbed on the encapsulated biosorbents was desorbed by the 1 M HCl solution. The capsule was reused 50 batches without loosing the metal uptake capacity. And the mechanical strength of the crosslinked capsule was retained after 50 trials.
Production of Bacterial Cellulose by Gluconacetobacter hansenii PJK Isolated from Rotten Apple
Park, Joong-Kon,Park, Youn-Hee,Jung, Jae-Yong The Korean Society for Biotechnology and Bioengine 2003 Biotechnology and Bioprocess Engineering Vol.8 No.2
A cellulose-producing strain isolated from rotten apples was identified as Gluconacetobacter hansenii based on its physiological properties and the 16S rDNA complete sequencing method, and specifically named Gluconacetobacter hansenii PJK. The amount of bacterial cellulose (BC) produced by G. hansenii PJK in a shaking incubator was 1.5 times higher than that produced in a static culture. The addition of ethanol to the medium during cultivation enhanced the productivity of bacterial cellulose, plus the supplementation of 1% ethanol into the culture medium made the produced BC aggregate into a big lump and thus protected the bacterial-cellulose-producing G. hansenii PJK cells in the shear stress field from being converted into non-cellulose-producing (Cel) mutants. Cells subcultured three times in a medium containing ethanol retained their ability to produce BC without any loss in the production yield.
Encapsulation of Whole Cell CGTase from Concentrated Broth Solution
Park, Joong-Kon,Sohn, Joon-Hyuk,Park, Hyung-Woo,Lee, Yong-Hyun The Korean Society for Biotechnology and Bioengine 2001 Biotechnology and Bioprocess Engineering Vol.6 No.1
Most of the Cyclodextrin glucanotransferase (Gtases) which have been produced from B. subtilis were found to be excreted from the cells during cultivation. Immobilized whole cell CGTase from B. subtilis was prepared by encapsulating the broth solution which had been concentrated ten times with a rotary vacuum evaporator. Cyclization activity of CGTase was reduced by about 10% during the concentrating process, however, its transglycosylation activity, to convert xylitol to glucosyl-xylitol, using dextrin as glucosyl donor, increased by a factor of 3 or 5.