Photoreactions of 2-(Pentamethyldisilanyloxy)phenylpentamethyldisilane

박승기 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5

Photolysis of 2-(pentamethyldisilanyloxy)phenylpentamethyldisilane 1 in methanol provides five photoproducts 3, 4, 5, 6, and 7. Compounds 3 and 4 were probably formed from the methanol addition reactions of silene intermediate 2 and the formation of 5, 6, and 7 can best be explained by the nucleophilic attack of methanol to silicon atom in pentamethyldisilanyloxy or pentamethyldisilanyl group of the photoexcited state of 1. Irradiation of 1 in n-hexane gives a photoproduct 6 via silyl radical intermediate 8 and a novel intramolecular cyclization photoproduct 11 via silene 9 and silyl radical intermediate 10. Irradiation of 1 in deaerated methylene chloride in the presence of acetone affords a novel photoproduct 11 and phenol 7 but the expected photoproducts from the reaction of the silene intermediate with acetone were not obtained.

수문지질특성에 의한 기준갈수량 추정

박승기,김태철,Park Seung-ki,Kim Tai-cheol 한국관개배수위원회 1997 한국관개배수논문집 Vol.4 No.1

The pattern of droughtflow which is important for oater resources development depends on the characteristics of watershed. Droughtflow depleted from the watershed mainly embedded with metamorphic rocks is much more than that from the watershed mainly embe

Synthesis of 2-(4-chlorophenoxy)-2-methylpropyl 3-phenoxybenzyl ether and its analogues

朴承基 水原大學校 1993 論文集 Vol.11 No.-

4-Chlorophenol(la)과 ethyl 2-bromoisobutyrate의 반응으로부터 ethyl 2-(4-chlorophenoxy)-2-methylpropionate(3a)를 합성한후, lithium aluminum hydride를 사용하여 환원시킨후, 3-phenoxybenzyl chloride와 반응시켜 원하는 2-(4-chlorophenoxy)-2-methypropyl 3-phenoxybenzyl ether(7a)를 좋은 수율로 얻었으며, 이 화합물의 유도체들도 합성하였다.

GIS를 이용한 농지 잠재생산성평가

박승기,이창수 한국공간정보학회 2001 한국공간정보학회지 Vol.9 No.2

이 연구는 지리정보시스템(GIS)로 구한 토지생산성지수(FPI)와 노동생산성지수(LPI)를 적용하여 농지의 잠재생산성지수(PPI)를 산정할 수 있는 모형을 개발하였고, 최근 경지정리사업이 완료된 지구에 적용하여 개발된 모형의 적용성을 검토하였다. 토지 생산성지수(FPI)는 분석대상지역의 토양 특성 Poly Grid를 중첩하여 결정하였으며, 노동생산성 지수(LPI)는 직접생산비중 GIS Network 분석으로 구한 통작거리와 논지분포에 따른 노력비 추가분을 전체 직접생산비에 대하 비율로 환산하였다. 마수지구와 원천지구의 개별 농지에 대한 전체생산성지수(PPI)는 각각 0.967∼0.712, 0.986∼0.780으로 비교적 큰 변이를 나타낼 수 있어 농지 평가에 대한 객관적인 자료로 적용할 수 있을 것이다. 농지의 잠재생산성지수를 경지정리 사업의 환지사업, 농민상호간에 농지교환 및 합병사업에 적용함으로써 농지의 규모화 및 집단화을 유도하고 농지생산성을 극대화할 수 있을 것이다. This study was carried out to developed that appraisement model of Potential Productivity Index(PPI). PPI model was used Farmland Productivity Index(FPI) and Labor Productivity Index(LPI) by GIS, and PPI model applied to farm land consolidation region which has been completed recently. FPI was determined by overlapping Poly Grid of the soil properties at the analyzed project region. LPI was estimated by addition productive wages ratio of total direct productive cost. Addition productive wages determined by GIS Network analysis GIS Network analysis of working distance between farm house to paddy and each paddy. PPI variation of each the analyzed paddy of Masu and Weoncheon region was 0.967~0.780 respectively, and could be showed relative largely PPI value. PPI will provide basic element for large scaling and gathering of farm land and a substitute lot of farm land consolidation, and will be maximize productivity of paddy.

韓國 經濟成長의 構造的 要因分析 : 時系列資料의 因子分析法 應用의 一試圖 A new attempt to apply Factor Analysis to the time series data

박승기 全北大學校 1989 論文集 Vol.31 No.-

The factor analysis is based on the hypothesis that numerous phenomena in a domain would have relations among them in various ways and be related with several common factors. Therefore the factor analysis is to get such common factors that are linearly combined to make a variable, whose number is larger than that of common factros. The purpose of this study is to apply factor analysis on search of structural factors of economic growth in Korea. The study has been done in order as the followings; 1) The 54 Variables which are related to the economic growth in 1967-1986 are considered. 2) The 13 factors, whose loadings are computed, are drawn by principle factor method. And they are revised by VARIMAX rotation. 3) Consequently it comes to light that the first factor contains 11 variables and works 28% of Korean economic growth to be explained. The results of other factors are presented in the table 1. 4) Variable with high communality, whose value is more than 0.98, are Manufacturing Operation Ratio Index, Loans an Deposit of Deposit Money Bank, Number of Motor Vehicles, and Export Price Indexes etc. These 10 variables may be used for the indicator of economic growth. 5) The factor score of the year 1978 comes out with the highest and the of the year 1985 is the lowest. It means that the factors move lively in the year 1978 and fall into a slump in the year 1985. The details are presented in the table 3. The most trouble matters take place in respects to a complete and overdetermined simple structure of factors. Without such a completeness and simplicity, the precision of factor analysis could not be guaranteed. In order to settle these, it needs to pick up appropriate variables, to improve analyzing technique and to pass throuqh numerous trial and errors.

意思決定에 있어서의 Bayesian 理論에 對한 小考

朴承基 全北大學校 1977 論文集 Vol.19 No.-

In business environments to become complicated more and more, a dicision maker seeks the scientific andrational decision making to achieve his purposes of business. To make a decision rationally, he must analyze to apprciate uncertain future events and take the conditions into account. Decision making under uncertainty requires that the decision maker uses his judgment and experience about future events. He must ascertain which outcomes. are more “likely”then others and combine this knowledge with the consequences associated with the various decisions. Such a process lies behind the familiar willingness to “take a calculated risk”. Bayes' decision process is a logical way of bringing both decision maker's judgment and the economic consequences of a given action to bear upon the decision. Implicit in any reasonable intuitive strategy that one may devise for action under uncertainty is a probability distribution about possible outcomes. The probability of jth consequence occuring if the ith strategy is adopted by the decision maker is assumed to be a meaningful and useful notion. Bayesian decision theory is based on Bayes' rule, and is to minimize the expected regrets in decision process by reflecting a posteriori probability, a priori probability and loss function. One is figured out to combine new informations with another which depends upon the decision maker's subjective judgment, and a third is the functional relation to be determined by the parameter and the estimate. The structure of Bayes' decision process depends mainly upon the sequential decision procedure, which is to decide sequentially the decision course by considering many-sided consequences of the alternative. Bayesian inference is the optimal statistical method if there is a known prior distribution and loss function Compared to classical methods, Bayesian methods often yield shorter interval estimates, more credible point estimates, and more appropriate hypothesis tests. Some mathematician do not think that“probability”should be based upon subjective intuition. They argue that only objective probabilities for respective events have any true meaning. However, in the real world, such objective probabilities are frequently not available and decisions must be made upon the best available information. On the ground of these, Bayesian methods are useful in the social sciences and business. Therefore, I conclude that Bayesian decision theory is needed to apply in decision making for achieving the rational business managements.

開放體系의 開發途上國의 國民經濟의 構造的 合理化 方向에 對한 理論的 考察

朴承基 전북대학교 산업경제연구소 1976 전북대학교 산업경제연구소 논문집 Vol.6 No.-

韓國經濟에 있어서 賃金과 物價間의 關係에 對한 考察

朴承基 전북대학교 산업경제연구소 1979 전북대학교 산업경제연구소 논문집 Vol.9 No.-

금강하구둑 배수갑문 조작에 의한 상류수역의 수위변동

박승기,Park, Seung-Ki 한국농공학회 2005 한국농공학회논문집 Vol.47 No.6

The normalization on the characteristics of water level change at the upstream gauging station was attempted according to the operation of drainage sluice gate of the Geumgang estuary dam. The characteristics were normalized by the analysis of water level change and by the linear-regression of the water level data measured at the inner station of Geumgang estuary dam and upstream gauging station. The results of normalization may be referred to the management of Geumgang estuary lake, the operation of pumping and drainage stations in the shore of the lake. The mean response time of water level change on Ibpo, Ganggyeong and Gyuam water level station were 39,81 and 160 minutes, when sluice gate was opened respectively. The mean velocity of surface wave, the mean displacement of water level change, the mean time of water level change and the mean rate of water level change varied largely depending on the location of gauging station and the characteristics of stream section of the water level gauging station.

벤조일 우레아 화합물의 합성

박승기 수원대학교 기초과학연구소 1996 基礎科學論文集 Vol.5 No.-

The reaction of benzaldehyde with NH_2OH-HCl gave the benzaldoxime(1) which reacts with NCS in DMF to give the benzohyroximoyl chloride(2). The compound(2) was reacted with ethyl propiolate using triethylamine as a base to give the isoxazole compound(3). The benzoyl urea compound was successfully synthesized through reduction, etherification, reduction, and reaction with benzoyl isocyanate from the compound(3).