한외여과에 의한 혈액순화의 근사적 표현

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.

실관 反應器내의 流體傳達 現象

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.

한외여과가 있는 튜브내의 압력강하

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.

복합 관동맥병변에서의 Rotational Atherectomy : 초기결과

김진우,박성욱,홍명기,이상곤,이일수,이철환,최기준,강덕현,송재관,김재중,박승정 대한순환기학회 1997 Korean Circulation Journal Vol.27 No.9

Metal Recovery Using Immobilized Cell Suspension from a Brewery

Park, Joong Kon,Choi, Seong Bok 한국화학공학회 2002 Korean Journal of Chemical Engineering Vol.19 No.1

Lead, copper, and cadmium were adsorbed onto calcium alginate beads containing the cell suspension discarded from a brewery. In the cell suspension, there were many cells under lysis. The cell-suspension immobilized beads were prepared by adding 0.6% (w/v) sodium alginate into the cell suspension from the brewery and then making the cell suspension fall dropwise into the swirling 1 % (w/v) calcium alginate solution. The dry weight of insoluble solid in the cell suspension was 96 g dry weight/1 and the dry density of the bead containing cell suspension was 140 g dry weight/ℓof the bead. The specific metal uptake of the cell-suspension immobilized bead was 23.7㎎ Pb^2+, 14.3㎎ Cu^2+, and 13.4㎎ Cd^2+/g bead dry weight, respectively. The cell-suspension immobilized beads retained the initial metal-uptake capacity after 20 repeated batches of adsorption and desorption, but the fraction of metal desorbed from the beads by 1 M HCl solution was only 70% of the adsorbed metal. The beads, which had been contained for 14 successive days in the 0.5% (w/v) CaCl_2 solution at 4℃ just after 20 cycles of adsorption/desorption, retained the initial metal-uptake capacity after 30 repeated cycles, and more than 90% of the copper and cadmium adsorbed on the beads was desorbed by the 1 M HCl solution.

Adsorption Selectivity of Phenylalanine Imprinted Polymer Prepared by the Wet Phase Inversion Method

Park, Joong Kon,Kim, Seong Joon,Lee, Jeong Woo 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6

A phenylalanine (Phe) imprinted polymer was prepared by the wet phase inversion method to investigate the optimum preparation condition which endows the polymer matrix with prominent adsorption selectivity. The addition of a large amount of porogen (dimethyl sulfoxide: DMSO) was needed to form manovoids in the polymer matrix. For the high adsorption selectivity of the polymer matrix, a complex between functional monomers and a template molecule must be formed before the copolymerization of anylonitrile (m crosslinker) and acrylic acid (AA: functional monomer). The formation of a phenyl group in the polymer matrix by the coupling reaction between D-Phe and AA seemed to cause the reverse adsorption selectivity of the polymer matrix. The adsorption selectivity of the Phe imprinted polymer was dependent on the pH of the racemate solution. The adsorption selectivity of the D-Phe imprinted polymer prepared by the post implanting method reached 11 at pH 2 and showed a reverse adsorption selectivity at pH 4 and 6.

Energy and Environmental Engineering, Biotechnology : Characteristics of Phenylalanine Imprinted Membrane prepared by the Wet Phase Inversion Method

( Joong Kon Park ),( Jeong Il Seo ) 한국화학공학회 2002 Korean Journal of Chemical Engineering Vol.19 No.6

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.

Annual Variation of Fresh Water Quality In the Gachang Dam Reservoir

Park, Joong Kon,Kim, Sung Kon 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.3

This paper investigated the relationship between the annual variation of the algae population and the physicochemical properties of the water reservoired in the Gachang Dam in the hopes of serving as a guideline in the production of a clean water supply water supply to regions of the city of Taegu. Summer thermal stratification was formed in the freshwater reservoired in the Gachang Dam and thus dissolved oxygen(DO) decreased according to the depth of the water. The pH of epilimnion was much higher than that of hypolimnion in summer because of the difference in the photosynthesis rate of algae. In July, at the beginning of the rainy season, the amount of total nitrogen(T-N) in the freshwater reached a maximum of 1.92 mg/L without an increase in the amount of total phosphorus (T-P). In August, the concentration of T-P in the freshwater increased steeply and reached 0.12 mg/L. Aulacoseira spp. (diatoms) were predominantly distributed in the freshwater throughout the year and Synedra and Asterionella (diatoms) predominantly populated in the spring. However, Anabaena and Microcystis (blue-green algae), which caused malodor and a bad taste, flourished predominantly in epilimnion in August when the temperature of the water at the surface region increased to the maximum and the concentration of T-P was sufficiently high.