• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 춘계학술대회논문집
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• pp.98-105
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• 1997

The behaviour of alloys in the semi-solid state strongly depends on the imposed stress state and on the morphology of the phase which can very from dendritic to globular. The estimation of behaviour characteristic in the compression simulation with seim-solid materials are calculated by finite element method with proposed algorithm. The proposed theoretical model and a various boundary conditions for compression process is investigated with the coupling calculation between the liquid phase flow and the solid phase deformation. The simulation process considering soldification phenomena is performed to the isothermal conditions of two dimensional problems. To analysis of compression process by using semi-solid materials, a new stress-strain relationship is described, and compression analysis is performed by viscoelastic model for the solid phase and the Darcy's law for the liquid flow. The calculated results for compression force and ram displacement will be compared to experimental data.

• 전자공학회논문지A
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• 제29A권11호
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• pp.106-112
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• 1992

In this paper, we analyze the structure characteristics of $As_{40}Se_{50-x}S_{x}Ge_{10}$ system bulk and thin films. As the results of XRD patterns, it identified amorphous state. In order to find the glass transition temperature($T_g$), crystallization($T_c$) and melting point ($T_m$)of bulk sample, it ascertained that TS1gT is 238$^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$, and 231$^{\circ}C$ in $As_{40}Se_{25}S_{25}Ge_{10}$ & $As_{40}Se_{50}Ge_{10}$ following the thernal analysis by DSC, DTA, & TGA method. Also it was confirmed the phase seperation of continuous phase and dispertion phase by the optical texture of polarizing microscope and $T_g$ near 20$0^{\circ}C$ in thin film. Therefore, it was found that it occurs the phase seperation of Ge-rich dontinuous phase and Se-rich dispersion phase following the EDS analysis of thin film and the surface SEM photograph.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 추계학술대회논문집
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• pp.109-114
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• 2009

As one of the promising model on the multiphase fluid mixtures, the Lattice-Boltzmann Method(LBM) is being developed to simulate flows containing two immisible components which are different mass values. The equilibrium function in the LBM can have a nonideal gas model for the equation of state and use the interfacial energy for the phase separation effect. An example on the phase separation has been carried out through the time evolution. The LBM based on the statistic mechanics is appropriate to solve very complicated flow problems and this model gives comparative merits rather than the continuum mechanics model.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1992년도 추계학술대회 논문집
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• pp.73-76
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• 1992

The amorphous phase of bulk and thin film in the As-Se-S-Ge system was observed by X-ray diffraction. Thermal analysis using DSC, DTA and TGA method has been used for the determination of the glass transition temperature, Tg. The glass transition temperature, Tg for the composition were $238^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$ and $231^{\circ}C$ in $AS_{40}Se_{25}S_{25}Ge_{10}$ and $As_{40}Se_{50}Ge_{10}$. The phase seperation of continuous phase and dispersive phase was observed by the optical texture of the polarizing microscope. Also, the glass transition temperature of the thin film was near $200^{\circ}C$. As the results of SEM-EDS analysis, the phase transition of the films by thermal treatment and light illumination was the amorphous to amorphous.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.175-178
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• 2002

The purpose of this research is to evaluate the effect of microemulsion on the remediation of soil contaminated with organic materials. The laboratory tests were conducted to confirm the ability of microemulsion as remediation agent and compare remediation efficiency in microemulsion process with soil washing. In the test, pyrene was used as organic contaminant and alkylpolyethoxylates(C$_4$E$_1$) was used as surfactant. Microemulsion in the $C_4$E$_1$-water-decane mixture was formed in the range of 22 and 48$_{o}$ C at surfactant contents V=55%. Extraction was completed within 30 min and about 90% pyrene was removed. Seperation of pyrene with oil phase lowering temperature was sufficient for application in a multistep process.s.

• 한국환경과학회지
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• 제2권1호
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• pp.61-72
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• 1993

[에멀존]계에서 거대고리화합물에 의한 효과적인 수송현상을 두가지 관점에서 논의하였다. 하나는 중금속이온($Cd^{2+}$. $Pb^{2+}$ 및 $Hg^{2+}$)을 토루엔막으로 추출하는 경우.만일 금속=거대고리 화합물의 상로작용이 크다면 이 추출효과는 증가한다. 주번째 토루엔-경꼐면에서, 금속이온을 정량적으로 용리시키기 위해서는 금속이온 -Re-cieving Phase와 금속이온-거대고리화합물 사이의 상호작용에 대한 LogK의 사가 충분히 커야한다 첫번째는 거대고리 화합물의 주개원자, 치환제, 그리고 공동반경을 고려함으로써 해결된다. 이 연구의 결과들은 이론과 잘 일치하며, 시료용액의 종류는 에멀존망에 의한 금속이온의 수송현상에 영향을 준다.$SCN^-$,$1^-$ 및 $Br^-$이온과 같은 $A^-$이온을 사용할 경구, 수송순서는 $A^-$ 이온의 용매화순서의 크기에 일치하며, 용해도의 차이때문에 금속이온의 소송능력은 Receiving Phase의 화학종 농도의 크기에 영향을 받는다. 이 연구에서는 적당한 실험조건하에서 조절된 토루엔막을 사용함으로써 $Cd^{2+}$, $Pb^{2+}$, 및 $Hg^{2+}$ 이온의 혼합물로부터 각각의 단일이온들을 효과적으로 분리농축할 수 있었다. 그리고 $Cu^{2+}$,$Ni^{2+}$,$Zn^{2+}$,$Fe^{2+}$, 이온들은 중금속이온들을 분히 농축하는데 부분적으로 방해를 하였다. 그러나 알칼리 및 알칼토금속이온은 방해하지 않았다.

• 대한화학회지
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• 제38권2호
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• pp.122-128
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• 1994

거대고리 리간드는 금속이온과 선택적으로 결합하는데, 이를 이용하여 에멀젼 액체막을 통한 금속이온의 이동에 관하여 연구를 수행하였다. 금속이온은 유기층에 있는 운반체에 의하여 source phase에서 recevinng phase으로 이동한다. 운반체로는 거대고리 리간드인 $DBN_3O_3$를 사용하였다. 여기에서 에멀젼 액체막을 통한 금속이온의 이동에 관한 요인과 어떤 금속이온의 선택적 분리에 관하여 검토하였다. 금속이온과 거대고리 리간드 그리고 금속이온과 recevinng phase내에 있는 음이온에 대한 안정도 상수를 금속이온의 선택적 이동에 대한 척도로 조사하였다. 납이온이 혼합 용액에서 다른 금속이온보다 높은 이동속도를 나타내었다. Recevinng phases내의 음이온이 금속이온의 이동에 중요한 역할을 한다.Recevinng phases내에 있는 $NO_3^-$을 $S_2O_3^{2-}$대치하면 이동량이 증가함을 보였는데 이는 $Pb^{2-}-S_2O_3^{2-}$상호작용이 $Pb^{2+}-NO_3^-$상호작용보다 크기 때문이다.

• Archives of Pharmacal Research
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• 제14권2호
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• pp.99-102
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• 1991

A hight performance liquid chromatographic methods was developed for the seperation and determination of seven alkaloids in "sanjoin" (the seeds of Zizyphus jujuba Rhamnaceae), a plant with potent sedative activity. A reverse phase system of Lichrosorb RP-Select B column and 0.05 M potassium phosphate buffer (pH = 3.5)-acetonitrile with gradient elution was employed. Two known alkaloids, juzirine and lysicamine, were newly isolated fom "sanjoin"."sanjoin".oin&".ot;.

• 한국막학회:학술대회논문집
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• 한국막학회 2008년도 춘계 총회 및 학술발표회
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• pp.65-68
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• 2008

• Archives of Pharmacal Research
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• 제27권10호
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• pp.1009-1015
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• 2004

Quantitative Structure-Resolution Relationship (QSRR) using the Comparative Molecular Field Analysis (CoMFA) software was applied to predict the chromatographic behaviors of chiral drugs with an amine moiety on the chiral cellobiohydrolase (CBH) columns. As a result of the Quantitative CoMFA-Resolution Relationship study, using the partial least square method, prediction of the behavior of drugs with amine moiety upon chiral separation became possible from their three dimensional molecular structures. When a mixed mobile phase of 10 mM aqueous phosphate buffer (pH 7.0) - isopropanol (95 : 5) was employed, the best Quantitative CoMFA-Resolution Relationship, derived from the study, provided a cross-validated $q^2$ = 0.933, a normal $r^2$ = 0.995, while the best Quantitative CoMFA-Separation Factor Relationship, also derived from the study, yielded a cross-validated $q^2$ = 0.939, a normal $r^2$ = 0.991. When all of these results are considered, this QSRR-CoMFA analysis appears to be a very useful tool for the preliminary prediction on the chromatographic behaviors of drugs with an amine moiety inside chiral CBH columns.