• Journal of the Korean Society of Safety
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• v.31 no.6
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• pp.39-44
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• 2016

Suitable design and operation of distillation process is very dependent on vapor-liquid equilibrium calculation. The usual calculation method is use binary interaction parameter. Flash points of n-propanol+n-butanol and 2-butanol+n-butanol were measured by Seta-flash closed cup tester. Experimental Flash points were compared with those calculated by the method based on Raoult's law and the optimization method using Wilson equation. The binary interaction parameters obtained by the optimization method are then used to calculate the bubble points of n-propanol+n-butanol and 2-butanol+n-butanol.

• Journal of the Korean Society for information Management
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• v.20 no.1
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• pp.93-119
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• 2003

Models of Information seeking behavior were reviewed and analyzed. General models which could be utilized in designing empirical research of information seeking behavior were suggested. On general models of information seeking, applicable in multiple contexts. occupations, roles, and knowledge domains were focused. The models by Wilson. Krikelas. Dervin, Ellis. Kuhlthau, Leckie, and Johnson were examined chronologically.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1708-1711
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• 1997

본 논문에서는 미소간격의 전극에서 방전이 일어날 때 방사되는 전자파로부터 방전전류의 파형을 추정하는 방법에 관하여 검토하고 있다. 시간영역 전자계 측정용 안테나로부터 임의의 위치에서 측정한 전계 또는 자계를 이용하는 1 안테나법(단일 전자계법)과 두 지점에서 측정한 전계 또는 자계를 이용하는 2 안테나법(복수 전자계법)을 제안하고 있다. Wilson & Ma가 제시한 두 지점의 전계로부터 2 안테나법으로 추정한 방전전류의 파형을 Wilson & Ma의 실험결과와 비교하고 있다.

• YAKHAK HOEJI
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• v.46 no.5
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• pp.364-368
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• 2002

Optimal synthetic conditions of barium sulfate were investigated from the viewpoint of yield and bulkiness according to a randomized complete block design proposed by Box and Wilson. Barium chloride and Sodium sulfate were utilized as reactants in order to prepare barium sulfate in this study. The optimum Synthesis conditions of barium sulfate obtained from this study are as follows; Reactant temperature; 60~75$^{\circ}C$ (viewpoint of yield) and 60~71$^{\circ}C$ (viewpoint of bulkiness). Concentration of two reactants; 12.7~14.4％ (viewpoint of yield) and 5~10.5％ (viewpoint of bulkiness). Mole ratio of two reactants, [BaCl$_2$]/[Na$_2$SO$_4$]; 1.62~1.96 (viewpoint of yield) and 2.0 (viewpoint of bulkiness). Reacting time; 13~15 minutes (viewpoint of yield) and 12~14 minutes (viewpoint of bulkiness). Drying temperature of product; 86~10$0^{\circ}C$ (viewpoint of yield) and 6$0^{\circ}C$ (viewpoint of bulkiness).

• YAKHAK HOEJI
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• v.45 no.1
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• pp.23-28
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• 2001

Hydrotalcite was prepared by reacting with sodium carbonate, magnesium hydroxide and aluminum chloride solutions in this study. The optimum synthesis conditions based on the yield of the product were established by applying Box-Wilson experimental design. It was found that the optimum synthesis conditions of hydrotalcite were as follows ; reacting temperature : 63~9$0^{\circ}C$, concentration of reactant solution : 18.20~19.82%, molar concentration ratio of two reactants [Mg(OH)$_2$] / (AICl$_3$.6$H_2O$) : 6.0, temperature of washing water : 29.0-34.4$^{\circ}C$, drying temperature : 56-77.6$^{\circ}C$. The physicochemical properties of hydrotalcite as medicine were studied by use of chemical analysis, bulk volume test and acid consuming capacity measurements.

• Journal of Astronomy and Space Sciences
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• v.14 no.1
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• pp.33-43
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• 1997

New BVR CCD photometric observations of EB type close binary V388 Cyg were obtained at the Sobaeksan Astronomy Observatory during 10 nights from October to December 1995. We analyse new 3 color (B, V & R) light curves simultaneously using the Wilson-Devinney code. Now, it is not yet clear whether V388 Cyg is contact or semidetached system. Published epochs of times of minima to data were used to study the changes in period of the system, and calculated a new light elements with the secular terms, $-4.83{\times}10^{-10}$, which indicated the continuous decrease of the period.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.4
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• pp.499-505
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• 1998

This paper presents the method for an estimation of discharge current waveshapes in short gap discharge by a radiated electromagnetic field. The method of currentwaveform estimation described is using the one antenna method(single field method) with a measured electric or magnetic fields at given field point by a time domain antenna. In order to verify the availability of the estimated theory, the discharge current waveshape estimation was performed by one antenna method using the measured electric fields of Wilson & Ma and compared with experiments.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.1
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• pp.78.3-78.3
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• 2016

The Kepler mission of NASA has enabled to discover a lot of new W UMa-type binaries with continuous light curves measured with unprecedented accuracy. Interestingly, their eclipsing time variation (hereafter ETV) diagrams show anti-correlation between primary and secondary minima, presumably occurred by continuous spot variation (Tran et al. 2013; Balaji et al. 2014). Two active Kepler binaries (KIC06118779 & KIC08682849), reported as showing the anti-correlation in ETV diagram, were investigated to see that the anti-correlations are correlated with time-variable O'connell effects appeared in their light curves. As a result, it was found that the O'connell effects for two binary stars have varied in quasi-sinusoidal ways similar to the patterns of their anti-correlation variations. In addition, our light curve syntheses of two binary stars with the latest version of the Wilson-Devinney code (Wilson & devinney 1971) show that they are very deep-contact binary system with extremely low mass ratios.

• YAKHAK HOEJI
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• v.43 no.6
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• pp.689-695
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• 1999

Hydrotalcite was prepared by reacting with sodium carbonate, magnesium oxide and aluminum sulfate solutions in this study. The optimum synthesis conditions based on the yield of the product were established by applying Box-Wilson experimental design. It was found that the optimum synthesis conditions of hydrotalcite were as follows; reacting temperature : 48~63$^{\circ}C$, concentration of reactant solution : about 20%, molar concentration ratio of two reactants [MgO]/[Al. sulfate] ; 7.35~8.1, temperature of washing water : 34.4~37.4$^{\circ}C$, drying temperature : 74~81.5$^{\circ}C$. The physicochemical properties of hydrotalcite as medicine were studied by use of chemical analysis, D.S.C. thermogram, bulk volume test and acid consuming capacity measurements.

• Journal of Astronomy and Space Sciences
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• v.19 no.4
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• pp.263-272
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• 2002

A total of 616 observations (308 in B, 308 in V) to. V523 Cas was made on three nights from October 19 to 21 in 1999 using the 1.8m telescope with 2K CCD camera of the Bohyunsan Optical Astronomy Observatory of KAO. With our data we constructed the BV light curves and determined 4 times of minimum light. We also obtained physical parameters of the system by combined analysis of both light and radial velocity curves using the Wilson-Devinney code.