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General applications of modified Stokes expression for modeling and scale-up of expanded beds
Keun Garp Ryu,Yoon Mi Lee,권오열 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
The modeling of the behavior of expanded beds using Richardson-Zaki correlation in combination with the modified Stokes expression developed by Chae et al. [1] was successfully applied to the cases of small expanded beds (1 cm in column diameter) containing two different polydisperse particles used for ion-exchange operations, Chelating excellose (70-210 μm in diameter, 1.21 g/cm3 in density) and Streamline DEAE (100-300 μm in diameter, 1.20 g/cm3 in density). Empirical parameters determined for the modeling of the expansion of these small-beds (1 cm diameter) were found to have values similar to those for the case of larger expanded beds (2.5 cm in diameter) containing the same particles. This indicates that the modeling method can be utilized for the scale-up purposes of the expanded beds with various feed solutions.
클라이언트 / 서버 환경에서 분산 어플리케이션의 기본유형과 적용기준
김갑중(Garp Choong Kim),신재훈(Jae Hoon Shin) 한국경영학회 1998 經營學硏究 Vol.27 No.4
Client/Server technology is now regarded as a general solution to many problems inherent in legacy systems in the past. New concepts, technologies, and hardware solutions are pouring into the market almost everyday. However, several key questions, ironically, are still left answered and does not get much attention: What are the possible types of the client/server systems? What kind of business applications best fits to the client/server? How about the relationship between business characteristics and types of the client/server? Characteristics of business application determine the optimal type of client/server system. This study aims at providing guidelines for selecting the optimal client/server systems based on characteristics of business application. In doing so, this paper found out that there are fourteen different kinds of client/server systems, categorized the application characteristics into four major and sixty-one detailed items, and generated a five-scale fitness table based upon the experts` opinions between business characteristics and types of client/server systems.
( Keun Garp Ryu ),( Jun Sang Bae ),( Kyu Bum Kwack ),( O Yul Kwon ),( Sun Ho Park ) 한국미생물 · 생명공학회 2002 Journal of microbiology and biotechnology Vol.12 No.3
Lysis of erythrocytes isolated from human, rabbit, and mouse blood samples was investigated with the culture supernatant of Xenorhabdus nematophilus in a primary form. Prior to use, the culture supernatant of the bacteria was concentrated and the concentrate was dialyzed against Tris-HCl buffer (10 mM, pH 8.1) by ultrafiltration using PM-5 membrane with a molecular weight cut-off of 5,000. At 30℃, the supernatant exhibited no lytic activity towards three types of erythrocytes. However, at 4℃, the supernatant showed selective lytic activity towards rabbit erythrocytes within 90 min, yet did not lyze human or mouse erythrocytes. Microscopic examination clearly revealed that most of the rabbit erythrocytes had been turned into ghost forms.
PEROXIDASE - CATALYZED POLYMERIZATION OF p - CRESOL IN SUPERCRITICAL CO2
Ryu, Keun Garp,Kim, Sun Wook 한국화학공학회 1996 Korean Journal of Chemical Engineering Vol.13 No.4
The feasibility of the catalysis of horseradish peroxidase (HRP) in supercritical CO₂ was studied for the polymerization of p-cresol in the presence of H₂O₂. The reactions were performed at 40℃ and 74.8 atm (1100 psia) above the critical conditions of CO₂. In the initial tests with 2 mM of p-cresol and 1 mM of H₂O₂, more oligomers of p-cresol were produced as more HRP was added. This indicates that HRP is active in supercritical CO₂. HRP was not completely inhibited by H₂O₂ at concentrations up to 211 mM. Increasing the initial concentrations of p-cresol and H₂O₂ to 20 mM, respectively, resulted in the formation of precipitates which were undissolved either in water or in dimethylforamide (DMF). The effects of adding water and/or methanol as cosolvents on the reactivity of HRP were studied subsequently. When more than 13.3 mL of water per liter of reaction volume was added, the formation of precipitates was not observed. The reactivity of HRP was sustained when up to 11.8 mL of methanol per liter of reaction volume was added. In most cases conversion of p-cresol was less than 50% for 5 hours of reaction time.
Horseradish Peroxidase 효소촉매에 의한 난연성 페놀고분자의 합성
유근갑 ( Keun Garp Ryu ),박한솔 ( Han Sol Park ),박정희 ( Jung Hee Park ),이학성 ( Hak Sung Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
The optimum synthetic conditions of poly(p-phenylphenol) by horseradish peroxidase in dioxane:water (80:20 v/v) mixtures were studied. The stability against thermal degradation and structural properties of the synthesized phenolic resins were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. The synthetic yield of poly(p-phenylphenol) increased upon the increase of the amount of enzyme up to 0.25 mg HRP/mL, then leveled off for further increase of the enzyme usage. When sodium acetate (100 mM, pH 4~6) and sodium phosphate (100 mM, pH 7~9) were used as the buffering salts for the aqueous component (20% v/v), the synthetic yield of the resin increased at higher pH of the aqueous buffer. But when the pHs of the aqueous buffer were 6 and 9, the synthetic yield strongly depended on the types of the buffering salts; if sodium phosphate was used instead of sodium acetate at pH 6, the yield decreased by about 15% and if sodium bicarbonate was used instead of sodium phosphate, the yield decreased by almost 20%. When the pH range of the aqueous buffer was from 4 to 7, the addition of a radical mediator, 2,2``-azinobis (3-ethylbenzothiazoline-6-sulfonate) (ABTS), up to 2 mM improved the synthetic yield of the resin by about 10%. TGA experiments revealed that the thermal stability of the resin synthesized in dioxane:water (100 mM sodium phosphate, pH 9) (80:20 v/v) was high having the char yield of 47% upon the heating at 800℃. DCS results showed that the structures of the polymers synthesized in acidic aqueous buffers were different from those of the polymers synthesized in the basic aqueous buffers. However, all the synthesized resins were found to have the property of the thermosetting resins.
Cho Yeong-Garp,Kim Young-Ki,Lee Kye-Hong,Choung Yun-Hang Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.5
The HANARO reactor has a vertical hole for a cold neutron source (CNS) in the heavy-water reflector tank, i.e., the CNS hole, which was considerably deformed during its welding to the horizontal cold neutron (CN) beam tube. This paper presents an investigation of the form of the CNS hole for the optimal design of the a vacuum chamber for the CNS. In addition, the installation method of the vacuum chamber into the CNS hole for minimizing the water thickness between the vacuum chamber and the nose of the CN beam tube is proposed.