엑스선螢光分析에서 金屬三成分系의 매트릭스 效果에 關한 硏究

예진해 安東大學 1987 安東大學 論文集 Vol.9 No.1

엑스선 형광분광법은 실험 조작이 비교적 간편하고 신속성을 가지며 시료의 비파괴적인 장점이 있는 반면 분석원소의 함유량과 엑스선 형광세기 간에 직선관계를 얻기 어려운 점이 문제이다. 엑스선 형광세기는 해당 분석원소의 함유량에 비례하지만,공존하는 다른 원소들의 함유량에도 영향을 받게 되는데, 이를 매트릭스 효과라고 한다. 따라서, 성분 원소의 정확한 함유량을 구하려면, 이 매트릭스 효과를 줄이거나 보정해 주어야 한다. 이 방법은 여러 가지 형태로 보고 되어 있다. 본 실험에서는 표준물질은 2성분계에서 쉽게 자작할 수 있는 금속 산화를 분말을 시료로 하여 반실험식을 이용해서 매트릭스 효과 보정계수를 구하였고 3성분계 시료는 금속 분말 산화물과 금속 합금 덩어리인 B.A.S및 J.A.E.R.I의 표준시료를 사용했다. 2성분계 금속 분말 산화물에서 얻은 매트릭스 효과 제수의 성질과 또 이 매트릭스 효과계수로서 3성분계인 분말 산화물 시료의 합금 덩어리 시료의 미지 성분 함량을 계산해 낼 수 있는지를 조사 하였다. X-ray fluorescence analytical technique is well known method for nondistructive analysis of metallic alloyes. However, there are some difficulties in concentration measurement of the constituents due to the fact that interaction of not only primary X-ray but also the secondary X-rays emitted by the elements exists among the neighbouring constituents. The purpose of this study is to obtain X-ray absorption-enhancement coefficients of the matrix by use of metallic oxides mixture so that both constituent and composition can be easily varied and to examine applicability of these coefficients to metallic ingot samples for composition measurements. Metallic oxide binary and ternary mixture samples have been prepared by mixing them to make 10, 20, 30?to 90% compositions then by pressing it at 30tons of 300 mesh powder for 5 minutes in dimensions of 40mm diameter and 10mm thickness. The matrix effect coefficients, an, obtained by use of Birks equation are, respectively, 1.055, 0.566, 2.770 for a_(FeFe), a_(FeNi), a_(FeCr); 2.616, 0.987, 2.070 for a_(NiFe), a_(NiNi), a_(NiCr); and 0.645, 0.627, 1.002 for a_(CrFe), a_(CrNi), a_(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. Matrix effect coefficients are also obtained by using B. A. S. standard ingot samples. However, the coefficients calculated are widely dissagreed among the selected sets of ingot samples. 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.

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.

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.

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).

차량 정보 시스템의 설계를 위한 인간공학적 연구 및 가이드라인 고찰

예진해,신종규,우종하,김상호,Yae, Jin Hae,Shin, Jong Gyu,Woo, Jong Ha,Kim, Sang Ho 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.5

Objective: This study is to provide a foundation for developing comprehensive ergonomic design guidelines for in-vehicle information systems (IVIS) by giving an overview of existing researches as well as setting further research directions. Background: The drivers get much more information recently while interacting with new safety functions of the cars. To avoid cognitive overload of the drivers, IVIS should be deigned appropriately by considering various human factors and task conditions. Method: We gathered, analyzed, and summarized ergonomic researches concerned with IVIS design conducted inside and outside Korea according to a categorization system proposed in the study. Frequency analysis was conducted for figuring out what kind of issues took major part of the researches, and their trends across time and regions. Results: Compared to domestic researches, those done in overseas tend to deal with more variety of independent, dependent and extraneous variables. The overseas researches also showed a tendency to get ahead in making ergonomic guidelines for IVIS design by adapting and integrating the results from previous researches. Conclusion and Application: There have been many researches regarding with ergonomic IVIS design, but some of their results became old-fashioned as the technology evolved. Not many researches have considered diverse human factors regarding the drivers' characteristics except age and gender. It is expected that researchers and designers take advantage of this study to find and review relevant results and set out issues of their own for more progressive researches of the field.

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.

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.

粉末酸化物 混合試料의 엑스線 螢光增幅係數와 그 利用

예진해 安東大學 1986 安東大學 論文集 Vol.8 No.1

X-ray fluorescence analytical technique is well known method for nondistructive analysis of metallic alloyes. X-ray intensity from some element in a matrix of other elements is not linear with composition because of selective absorption or secondary fluorescence within the specimen (matrix effect). The purpose of this study is to obtain X-ray absorption enhancement coefficient of the matrix by use of metallic oxides powdered mixture so that both constituent and composition can be easily varied and to examine applicability of these coefficients to metallic ingot samples for composition measurments.

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.