계면활성제 S.D.S를 이용한 미셀형성에 관한연구

예진해,최종하 안동대학교 기초과학연구소 1999 基礎科學 硏究論文集 Vol.10 No.1

계면활성제가 수용액중에 용해되어 어떤농도에 도달하면 미셀이라는 응집체가 형성된다. 본 연구에서는 계면활성제의 특성과 열역학적 성질을 고찰하고, 또 계면활성제인 S.D.S를 사용하여 미셀형성의 농도를 측정하였다. 측정방법으로 표면방법과 점도 측정방법을 이용하였다. A Study of the surface tension and viscosity for micelle formation of the surfactant in water if the surfactants arrive at a certain concentration by dissolving in water, a cohesion is formed that is called a micelle. Dodecyl sulfate(SDS) micelle solution has been studied. The critical micelle concentration(CMC) of SDS solution was found to be 5 mM. The vale of micelle formation of surfactant was in good agreement with 5 mM of SDS by surface tension at 25.0±0.5℃, and with 5 mM of SDS by viscosity at 25.0±0.5 ℃ respectively. The Thermodynamic function of the micelle formation in water was studied. In all case, the ideal solution theory is application for dilute system for thermodynamic property.

Monte Carlo Method의 수치해법에의 적용에 관한 연구

예진해,장인락 安東大學 1990 安東大學 論文集 Vol.12 No.1

We define Monte Carlo method to be a scheme employing random numbers, U (0, 1) random variables, which is used for solving certain stochastic or deterministic problems. Thus, To see how deterministic problem can be approached by Monte Carlo method, we evaluated the integral sin(x) dx and buffon needle problem. Fig5 and Fig8 shows the results of applying Monte Carlo method to evaluation of integral and buffon problem for various values of n.

액스선 형광에 의한 Ni-Fe-Cr계의 내부조직 효과에 관한 연구

예진해 安東大學 1985 安東大學 論文集 Vol.7 No.1

The purpose of this study is to obtain X-ray absorption-enhancement coefficient of the matix by use of metallic oxides mixtuse so that both constituent and composition can be easily varied and to examine applicability of these coefficient to metallic ingot samples for composition measurements. Instead of using the coefficient obtained from the ingots, competition of alloy ingots and powdered oxide termary have been calculated by usage of the coefficients of obtained from the oxide binany mixture and the concentration are found to be within 2.2~4.5% of relative errors.

SYSTEM성능 분석을 위한 QUEUEING MODEL

예진해,장인락 안동대학교 기초과학연구소 1990 基礎科學 硏究論文集 Vol.1 No.1

본 대학 전산소의 CYBER 932-11 COMPUTER SYSTEM 에서 SIMULATION한 결과 TERMINAL 수에 따른 RESPONSE TIME과 CPU의 이용율등은 <표4.1>과 같다. <표4.1>의 결과를 보면 대화식 사용자에게는 될수록 2-3초 이내로 응답을 빠르게 해 주어야 하는데 평균 3초 이하의 RESPONSE TIME을 갖기 위해서는 22대 이하의 TERMINAL에서 가능하였으며 CPU의 이용율은 46대 이상의 TERMINAL에서 BUSY 상태임을 알 수 있다. ◁표 삽입▷(원문을 참조하세요) We believe that it is important for the student of simulation to have at least a basic understanding of the components of a queueing system, standard notation for queueing system, and measures of performance which are often used to indicated the quality of service being provided by a queueing system. Thus, we simulated the computer system for 5000 jobs completionsl and estimated the average response time(user oriented measure), the time-average number of jobs waiting in queue, and the utilization of cpu(system oriented measure).

액스선 형광분광법에서 매트릭스효과를 보정하기 위한 실험계수 이용법

예진해 安東大學 1989 安東大學 論文集 Vol.11 No.1

The matrix effect should be reduced to the mininum in order to examine the proper contents of analytic elements in the X-ray spectro-analytic method. To reduce this matrix effect, a formular is established in relation to several factors such as the X-ray fluorescent intensity of a certain element in a well -known sample, the contents of the element, the reflex-principle of X-ray radiation, and the characteristic that the adjacent matrix teduces or increases the analytic line intensity in proportion to the differences in the mass absorption coefficient of each element. The process in which the matrix effect coefficient is derived from this formular and the method of using this coefficient by which the contents of an unknown elements can be discovered are discussed.

X-선형광분석에서 matrix 효과의 실험계수 보정

예진해 安東大學 1996 安東大學 論文集 Vol.18 No.1

The matric effect should be reduced to the minimum in order to examine the proper contents of analytic elements in the x-ray spectra-analytical method. To reduce this matrix effect, a formula is established in relation to several factors such as the x-ray fluorescent intensity of a certain element in a well-known sample, the contents of the element, the reflex principle of x-ray radiation, and the characteristic that the adjacent matrix reduces or increases the analytic line intensity in proportion to the differences in the mass absorption coefficient of each element. It is found that effect of F_(e) and C_(r) on N_(1) are absorption rich and effects of F_(e) and N_(1) on C_(r) are enhancement rich, wheres N_(1) enhances Fe fluorescence but C_(r) absolves F_(e) K_(a) line. And the x-ray fluorescence intensities were compared and analyzed between the metallic oxides and the ingot samples.

음이온 - 비이온성 혼합 계면활성제와 요오드간의 상호작용에 미치는 Mg^(2+)의 영향

예진해 안동대학교 기초과학연구소 1995 基礎科學 硏究論文集 Vol.6 No.1

In the presence of SDS(soduim dodecyl sulfate) the effect of Mg^(2+) on the interaction of nonylphenol-(ethylene oxide)_(n) [(NP-nEO) n=12, 40, 100]with iodine in aqueous solution were investigation by UV-visible spectrophotometer. In the prescene of SDS, the intensity of interation peaks of the absorbance were decreased and markedly increased by the addition of Mg^(2+). CMC was decreased with increasing Mg^(2+) concentration and these effects depend on ethylen oxides number. The increase in the intensity of the interaction peaks were attributed to the compactness of micelle in the presence of Mg^(2+). These phenomena may be explained by the fact that the linear ethylene oxide chains, to be free configuration in aqueous solution, could form a psuedo-crown ether structures of forming complex with Mg^(2+).

계면 활성제의 미셀형성에 대한 고찰

예진해,최종하 안동대학교 기초과학연구소 2000 基礎科學 硏究論文集 Vol.11 No.1

If the concentration of surfactant reached to any constant point in water, the physical property of the solution is changed rapidly. This is becouse of formation of micelles in water as cohesion. In this study, Dodecylsulfate was used as a raw matrial and the structure of micelles and the process of micellization were explained in term of thermodynamics. The ideal solution theory was also applied to this explanation in the range of dilute concentration. Adsorptivity surface tension and viscosity of surfactant solution contain micelles were also considered in this study.

계면활성제의 수용액에서 미셀형성에 대한 연구

예진해 安東大學 1997 安東大學 論文集 Vol.19 No.1

계면활성제가 수용액 중에 용해되어 어떤 농도에 도달하면 미셀이라는 응집체를 형성하며, 이 미셀의 내부에 소수성의 물질을 녹일 수 있는 성질을 갖고 있다. 수용액에서 이 미셀형성에 대한 열역학적 함수를 고찰하였으며, 상분리모델과 mass action model을 비교하였다. 이온성미셀은 10∼100개의 회합수를 가지는 약간 평면모양의 구형이며 그 내부는 탄화수소 방울과 같은 형태를 하고 있다. 비이온성미셀은 비교적 커서 1000이상의 회합수를 가지고 이온성보다는 덜 구형인 모양을 하고 있다. 이온성이건 비이온성이건 C.M.C의 존재로 그 형태를 예측할 수 있고 또 여러 가지 열역학적 함수를 계산할 수 있다. If the surfactants arrive at a certain concentration by dissolving in water, a cohesion is formed that is called a micell. this micell has the ability to dissolve hydrophobic material on its inside. The thermodynamic function of the micell formation in water was studied. The phase-model of the micell formation in water was compared with the mass-action model. The ionic micell forms an association number between 10 and 100. It is a spherical-ellipsoidal type. The inside of micell takes on the same characteristics of the hydrocarbon drop. Non-ionic micell has an association number above 1000. Its shape is less than the spape of an ionic micell. Whether ion or non-ion, we can estimate the form by presence of c.m.c's, and we can count the types of thermodynamic functions.

X-선 형광분석에 의한 Fe-Ni-Cr계의 매트릭스 효과에 관한 연구

예진해 안동대학교 기초과학연구소 1991 基礎科學 硏究論文集 Vol.2 No.1

X-ray fluorecence analytical technigue is well known method for nonditsuctive analysis of metallic alloyes. However, there are some difficulties in concentration measurement of the constituents due to the fact interaction of not only primary x-ray but also the secondary x-ray emitted by the elements exists among the neighbouring constittuents. The purpose of this study in to obtain x-ray absorption enhancement coefficients of the matix by use of metallic oxides mixture so that both constituent an composition can be easily varied and to examine applicability of there coefficients to metallic ingot samples for composition measurements. Metallic oxide binay and ternary mixture samples have been prepared by mixing and pressing it. The matix effect coefficients, a_(ij), obtained by use of Briks equation are, respectively, 1.055, 0.566, 2.770 for α_(FeFe), α_(FeNi), α_(FeCr) ; 2.616, 0.987, 2.070 for αNiFe, αNiNi, αNiCr ; and 0.645, 0.627, 1.002 for α_(CrFe), α_(CrNi), α_(CrCr). It is found that effects of Fe and Cr on Ni are absorption rich and effect of Fe and Ni on Cr are enhancement rich, whereas Ni enhances Fe fluorescence but Cr absorbes Fe Ka line. Instead of using the coefficients obtained from the ingots, composition of the alloy ingots have been calculated by usage of the coefficients obtained from the oxide binary mixture and the concentration estimations are found to be within ±2% of relative errors.