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PCL-MMT 나노복합재료의 기계적 성질과 생분해에 관한 연구
최현국 ( Hyun-kuk Choi ),이영세 ( Young-sei Lee ),박재경 ( Jae-kyeung Park ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.1
PCL were intercalated into organically modified MMT(PCL-MMT) at 80°C for 4hrs to prepare the PCL-MMT nanocomposite. PCL-MMT and PCL were mixed mechanically with two-roll mill at 150 ℃ for 15mins. From the results of XRD and TEM, it were found that PCL-MMT nanocomposite were prepared. And mechanical properties and biodegradation of nanocomposite have been investigated by tensile meter and biodegradability analysis experiment. Because of MMT dispersed homogeneously in PCL matrix, the Young's modulus of the nanocomposite was found to be excellent. But the tensile strength and elongation were decreased as increase of MMT. And MMT dispersed in PCL matrix was almost not affected on the biodegradation of PCL.
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim),요시히토카토(Yoshihito Kato) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.2
Shake mixing has been widely used in cell culture. The' mixing performance for shake mixing, however, has not been reported quantitatively. The critical circulating frequency and the power consumption for complete suspension of particles, based on the definition of Zwietering, were measured in a shaking vessel containing a solid-liquid system. The critical suspension frequency was correlated by the equation from Baldi's particle suspension model modified with the physical properties of the particles. Critical suspension frequency was correlated as following;<br/> ??<br/> The power consumption at the critical suspension condition in the shaking vessel was less than that in an agitated vessel with impeller.<br/> <br/>
액-액 교반조내에서의 물질이동용량계수 및 액적경의 특성
이영세 ( Young Sei Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
Grasp of characteristics within liquid-liquid agitated vessel are very important to environment and chemical industry. Mass transfer volumetric coefficient and the Sauter mean diameter of near the droplet were measured by varying the impeller position and liquid height using the alkaline hydrolysis reaction of esters. As a result, following their good correlation was obtained. d32 0.270 [a0.6 p0.2 p0,4 Vi] KLa=0.49[6¢DA d2 32][Pvd4 32 Pv3]0.193 Sc 1/3.
이영세(Young-Sei Lee),이준만(Joon-Man Lee) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.4
A numerical algorithm for three-dimension laminar flow in an agitated vessel was established by using the spherical coordinates. Flow pattern for the double-stage paddle impeller was not dependent upon the distance of among the impeller in the agitated vessels. The numerical simulation of the flow pattern in spherical and cylindrical agitated vessel agree well with the visualization results.
우레탄을 이용한 해양 및 수중구조물의 보수/보강용 신소재 특성
이영세(Young-Sei Lee) 한국산업융합학회 2013 한국산업융합학회 논문집 Vol.16 No.1
In this study, characteristic of new materials for repairing/reinforcement of sea and underwater structures using urethane were studied experimentally. As a results, following their good result was obtained. Materials and construction methods due to a chemical reaction, so no seams, shape or form, regardless of the variety of civil engineering in the field can be applied. Fast workability, hardening existing concrete compared with 80% in shortening. Than the existing large concrete pouring construction cost could be reduced by more than 30%.
8자 진동교반에 의한 교반조내 유동상태 및 물질전달 특성
이영세 ( Young Sei Lee ),가등정인 ( Yoshihito Kato ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.2
8자 진동교반조에 대해 실험적으로 유동상태를 관찰하여 혼합 가시화, 소요동력, 고-액 및 기-액 물질이동에 대한 여러가지의 특성을 측정하였다. 진동수가 증가하면 유동상태, 혼합시간 소요동력 및 물질이동계수는 규칙적으로 변하지 않으므로 조작조건의 선정이 중요하다. 어떤 진동수에서라도 Fr = 0.095 이상에서는 실험적으로 명확하게 되었다. 이때교반조내 유체는 선회류형으로 되어 혼합에 적합한 상태가 되고, 8자 진동교반에서의 최적 조작범위는 왕복 진동교반 보다도 넓었다. 8자 진동교반과 기존의 선회진동교반내의 고-액간 물질이동계수는 완전히 같은 식으로 상관되었다.또한 기-액간 물질이동용량계수도 기존의 선회진동교반에서의 식과 같은 형태의 상관식으로 나타났다. The flow pattern and the solid-liquid mass transfer coefficient in figure-eight shaking vessels were observed by experimental method. The flow patterns, mixing time, power consumption and mass transfer coefficient in the figureeight shaking vessels changed irregularly with increase in the shaking frequency. Any frequency, even in the Fr = 0.095 or more became clear experimentally. The region of the optimum operating condition of the figure-eight shaking was larger than that of the reciprocal shaking. The solid-liquid mass transfer coefficient was correlated with the same correlation as that of the rotary shaking vessel of existing. The gas-liquid mass transfer coefficient of the figure-eight shaking vessel was also correlated with the same type of correlation as that of the rotary shaking vessel of existing.
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim),김종식(Jong-Shik Kim),식이문(Takafumi Ue),가등정인(Yoshihito Kato) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.1
Based on the flow patterns of cylindrical vessel, the flow patterns of conical vessel, spherical vessel, rectangular vessel and cylindrical vessel with baffles were visualized by a trace method using aluminum powder. In addition, the correlations of the critical circulating frequency for mixing were derived from the experimental results. The conical and spherical vessels which have circular cross sections were same effective as cylindrical vessel for the shake mixing due to developing the rotational flow. Both a rectangular vessel and a cylindrical vessel with baffles should not be adapted for shake mixing because of not developing rotational flows in these type of vessels.
교반조 바닥의 방해판이 유동특성 및 입자부유에 미치는 특성
이영세(Lee, Young-Sei) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2
교반조 바닥에 방해판이 부착된 경우 유동특성 및 입자부유특성을 실험적으로 연구하였다. 입자의 유동상태는 교반 조 바닥 중심으로부터 상승류가 증가하였다. 입자부유 실험으로부터 에크만 경계층의 발달에 의해 입자부유가 촉진됨을 알 았다. 본 실험범위 내에서의 임펠러 및 교반조 바닥 방해판의 최적조건을 다음과 같이 나타내었다. 교반임펠러 최적조건 : n<sub>p</sub>= 6, d/D 0.5, b/d = 0.3, 교반조 바닥 방해판 최적조건 ; n<sub>b</sub>= 6, d<sub>b</sub>= 0.5, b<sub>w</sub>= 0.05 This study examined experimentally the characteristics of the flow pattern and particle suspension in an agitated vessel with a bottom baffle. A flow pattern of the particles was shown to increase the upward flow from the center of the agitated vessel bottom. The suspended particles from the experiment found that the particle suspension was promoted by the development of an Ekman boundary layer. The optimal conditions of the impeller, and the agitated vessel bottom baffle within the experimental range were as follows: Impeller, n<sub>p</sub>= 6, d/D= 0.5 and b/d = 0.3; and bottom baffle, n<sub>b</sub> = 6, d<sub>b</sub>D= 0.5 and b<sub>w</sub>/D= 0.05