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An Extention to the Class of Improved Estimators in Continuous Multiparameter Exponential Family
Baek, hoh Yoo 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.2
本 論文에서는 連續 多重 指數族에서 加重 제곱 損失 函數 下에서 自然 母數 벡터를 推定하는 問題를 생각하였다. 다음으로 이 問題에 適用하는 한 방법으로 微分 不等式의 一般解를 나타내고 Shinozaki[9]와 Ghosh와 Auer[5]의 結果들을 一般化 하였고, 마지막으로, 正規 分布와 감마 分布에서 一樣 最少 分散 不偏 推定量(UMVUE) 또는 그것의 旣知 常數곱의 推定量 보다 改良된 推定量들의 擴張된 類形을 나타내어 보였다.
Increment of the mean trapping time for the imperfect trap
Lim, Sung Woo 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.2
Trap이 불완전한 청우, 즉 확산 입자가 Trap과 만나도 없어지지 않고 Trap을 벗어날 확률이 있는 경우에는 확산 입자가 한정되지 않으므로 가장 간단한 일차원의 경우에도 잔류확률의 계산이 용이하지 않다. 여기서는 확산 입자가 Trap을 벗어날 수 있어도 결국 그 Trap으로 흡수된다는 가정하에 확산 입자의 평균포획시간을 계산하였고 Monte Carlo 모사를 수행하여 계산의 결과를 확인하였다.
A measure of slope-rotatability for second order response surface experimental designs
Park, Sung H.,Kim, Hyuk J. 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
In the design of experiments for estimating the slope of a response surface, slope-rotatability is a desirable property. In this paper, a measure is introduced that enables us to assess the degree of slope-rotatability for a given response surface design. The measure takes the value zero if and only if the design is slope-rotatable, and becomes larger as the design deviates from a slope-rotatable design. Examples of applying this measure to some response surface designs are also given.
N-Oxyldiethylenebenzothiazole-2-sulfenamide의-S-N= 결합에 대한 전기화학적 환원
金海珍,鄭根鎬,崔圭源,金日光,林善英 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
N-Oxyldiethylenebenzothiazole-2-sulfenamide(ODBS ; 가황촉진제)의 전기화학적 환원을 직류와 시차펄스 폴라로그래피 순환 전압전류법, 조절전위 전기량법으로 연구하였다. ODBS의 전극환원과정은 단일 환원파(-1.86 volts vs. Ag/0.1M AgNO₃ in AN)에서 비가역으로 3전자가 이동하는 E-C-E-C 반응메카니즘으로 진행되었다. 조절전위 전기분해 결과 sulfenamide(-S-N=) 결합이 끊어지고 mercaptobenzothiazole(MBT)과 benzothiazole disulfide(MBT dimer) 그리고 유리된 sulfur 등이 생성물로 얻어졌다. pH 변화에 따른 폴라로그램의 해석과 생성물 분석의 결과를 바탕으로하여 전기화학적 반응 메카니즘을 제안하였다. The electrochemical reduction of N-oxyldiethylenebenzothiazole-2-sulfenamide(ODBS; vulcanization accelerator) was investigated by direct current polarography, differential pulse polarography, cyclic voltammetry and controlled potential coulometry. The irreversible electrode reduction of ODBS proceeded E-C-E-C reaction mechanism by three electrons transfer with irreversible one wave(-1.86 volts vs. Ag/0.1M AgNO₃ in AN). As the results of controlled potential electrolysis, mercaptobenzothiazole(MBT), benzothiazole disulfide(MBT dimer) and extricated sulfur were products which followed by cleavage of the sulfenamide(-S-N=) bond. Upon the basis of products analysis and polarogram interpretation with pH variable, electrochemical reaction mechanism was suggested.
Inter and Intramolecular Frisdel-Crafts alkylation of 5-(1,-1-dimethylheptyl)-resorcinols
Baek, Seung-Hwa,Han, Wan-Soo 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
촉매로서 BF₃-etherate를 사용하여 5-(1,1-dimethylheptyl)-resorcinol의 알킬화 반응을 보고한다. 알킬제가 시클로알릴알콜일때, 이 반응은 알킬화 생성물의 합성법으로서 간편하고 빠른 방법을 나타낸다. 분자간과 분자내 화합물은 놓고 탁월한 수득률을 보인다. The alkylation of 5-(1,1-dimethylheptyl)-resorcinols using boron trifluoride etherate as a catalyst is reported. When the alkylating agent is a cyclic allylic alcohol, this reaction represents a simple and rapid method for the synthesis of alkylation products. Both inter and intramolecular compounds are observed to proceed in good to excellent yields.
KIL, BONG-SEOP,YUN, KYEONG WON 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
The allelopathic effects of wormwood plants(Artemisia princeps var. orientalis) and their possible phytotoxicity on receptor species were investigated. The aqueous extracts of mature leaf, stem, and root of wormwood plants caused significant inhibition in germination and decreased seedling elongation of receptor plants, whereas germination of some species was not inhibited by extracts of stems and roots. Dry weight growth was slightly increased at lower concentrations of the extract, whereas it was proportionally inhibited at higher concentrations. The calorie value of the organic matter in receptor plants measured by bomb calorimeter was reduced proportionally to the extract concentration. However, results with extracts of juvenile leaf did not correlate with inhibition or promotion of elongation and dry weight.
새로운 의약품의 합성에 관한 연구 : 6-Thiocyanopenicillanic Acid 유도체의 합성
李英行,李寀浩,崔元植 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
6-Aminopenicillanic acid의 diazo화 반응과 sodium thiocyanate와 반응으로 새로운 β-lactam 화합물인 6-thiocyanopenicillanic acid(1a)를 합성하고 p-nitrobenzyl bromide, chloromelthylpivalate 및 1-chlorodiethylcarbonate들과의 반응에 의해 각각에 해당하는 ester(1b~d)를 합성하였다. A new β-lactam compound, 6-thiocyanopenicillanic acid(1a) was prepared by the reaction of diawnium salt of 6-aminopenicillanic acid with sodium thiocyanate. Reaction of 6-thiocyanopenicillanic acid(la) with p-nitrobenzyl bromide, chloromethylpivalate and l-chlorodiethylcarbonate, respectively, afforded the corresponding esters(1b~d).