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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.
상온 및 상압하에서 3성분계 {1,2-dichloropropane + 1,3-dioxolne + 1,4-dioxane}의 과잉 몰엔탈피 예측
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim) 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.1
The excess molar enthalpies Hm<SUP>E</SUP> at T=298.15 K and p=101.3 ㎪ of ternary system {1,2-dichloropropane (1,2-DCP) + 1,3-dioxolane+ 1,4-dioxane} were predicted by using the binary contribution model of Radojkovi? with correlated sub-binary Redlich-Kister parameters. Excess partial molar enthalpies Hi<SUP>E</SUP> were also calculated for the binary systems {1,2-dichloropropane + 1,3-dioxolane}, {1,2-dichloropropane + 1,4-dioxane} and {1,3-dioxolane + 1,4-dioxane} using adjustable parameters of Redlich-Kister equation. By extrapolation of excess partial molar enthalpies to infinite dilution, limiting excess partial molar enthalpies Hi<SUP>∞</SUP> of each component were also obtained. The ternary excess molar enthalpies excess partial molar enthalpies of these sub-binary systems have been calculated by using our previously reported results.
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) 한국산업융합학회 2014 한국산업융합학회 논문집 Vol.17 No.1
In this study, characteristic of elastic paving materials in bicycle road using polyurethane were studied experimentally. As a results, following their good result was obtained. Bicycle road packaging materials are flexural strength g test, ratio of mass change after freezing and thawing, repulsion elasticity test, water Permeation coefficient test and slip resistance test results showed good performance.
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.
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
이영세(Lee Young-Sei) 한국산업융합학회 2008 한국산업응용학회 학술대회 논문집 Vol.- No.-
In order to mixing characteristics of shake mixing, the first is flow patterns in shaking vessels with various geometries are visualized. The second is one means of improving of mixed state in a stirred bioreactor is to optimization of shape on the shaking vessel. The last is an attempt has been developed new shaped on the shaking vessel.
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.3
An attempt has been made to examine the highest liquid surface by means of measuring the movement of liquid free surface wave in the agitated vessel wall. Also, Relationship has been investigated between transition frequency, N?? for behavior of liquid free surface and transition frequency for behavior of mass transfer coefficient in the agitated vessel wall. A surface wave is occured within agitated vessel, the highest height of wetted vessel wall, h?? is coincided with the highest liquid surface, h. However the lowest height of wetted vessel, h?? is not descended to lowest liquid free surface, h. The proposed model has been tested sucessfully for the behavior of liquid free surface.<br/>
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%.
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/>