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An Eurpium(III) Hydrolytic Catalyst Favoring Anionic Phosphate Esters over Phosphate Triester'
윤창원,오순진,전영진,최영서,손윤경,황보석,구자강,박준원,Yun, Chang Won,O, Sun Jin,Jeon, Yeong Jin,Choe, Yeong Seo,Son, Yun Gyeong,HwangBo, Seok,Gu, Ja Gang,Park, Jun Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.2
A Cryptate (221) having a short alcohol pendant (2) was metallated with europium(Ⅲ) in anhydrous condition, and its hydrolytic activity for phosphate esters at neutral pH was examined. While the activity for the phosphate diester and monoester is comparable to that of the parent metal complex [1Eu]3+, its hydrolytic activity towards a phosphate triester is significantly suppressed. Potentiometric titration and luminescence spectroscopic studies for the equilibrium behavior of the complex in solution suggest that a dimer formation through the metal hydroxides as well as the pendant alcohol is likely to happen. The low hydrolytic activity for the triester seems to be associated with the dimer formation.
윤창원,Yun, Chang-Won 한국과학기술단체총연합회 1997 과학과 기술 Vol.30 No.6
과학기술이 지향하는 결과가 삶의 질을 높이는 것이라면 일반대중 앞에 다가가야한다. 연구활동도 이제부터는 연구원들끼리 폐쇄된 연구실에서보다는 일반대중과 함께 열린공간에서 이뤄져야 한다. 과학기술활동이 국민과 함께 이뤄지면 과학기술계의 최진실, 과학기술계의 박찬호가 탄생될 것이다.
조문수,정병희,윤창원,Jo, Mun-Su,Jeong, Byeong-Hui,Yun, Chang-Won 제어·로봇·시스템학회 1997 제어·로봇·시스템학회 논문지 Vol.3 No.5
기존에 있는 그룹테크놀로지의 방법들은 기계와 부품간의 공정유사성이나 그밖의 다른 정의의 유사성을 갖고 한 가지 정도의 알고리즘이나 수학적인 모델로써 해를 구했으나 그 해들은 실질적으로 현대 산업의 생산시스템이나 자동화에서 풀어나가야 하는 기계들의 병목현상을 풀어나가는 직접적인 접근방법을 제시하지 못했다. 따라서 본 연구에서는 새로운 기계간 유사성의 개발과 그래프이론을 응용한 알고리즘 그리고 수학적인 모델을 동시에 응용해서 병목현상을 초래하는 예외적인 원소의 재배치를 효과적이고 쉬운방법으로 제시하였다.
셀 제조시스템에 있어서 비유사도를 이용한 기계셀과 부품그룹의 동시형성방법
윤창원,정병희,김민규 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
The success of cell manufacturing applications in FMS rests on the effective cell formation to maintain the independent relations both between machine cells and between part families. This paper presents an integrated method for concurrent formation of cells and families with no E.E(Exceptional Element) in FMS with alternative routings. To determine the maximum number of cell and family with no E.E, mathematical conditions and theorems are derived. New concept of nonsimilarity is introduced for each machine and part based on machine-operation incidence matrix and part-operation incidence matrix. To concurrently form the cells and families, integer programming based mathematical models are developed. For the predetermined number of cell or family, model 1 is used to identify whether E.E exists or not. Model 2 forms cells and families considering only nonsimilarity. But model 3 can consider nonsimilarity and processing times. The proposed method is tested and proved using numerical examples.
기계중복과 셀간 이동수의 최소화가 가능한 예외적 요소의 제거 방법 : 비용 및 설치대수 제약 고려
장익,윤창원,정병희 한국경영과학회 1998 韓國經營科學會誌 Vol.23 No.4
Using the concept of cellular manufacturing systems(CMS) in job shop manufacturing system is one of the most innovative approaches to improving plant productivity. However. several constraints in machine duplication cost, machining capability. cell space capacity. intercell moves and exceptional elements(EEs) are main problems that prevent achieving the goal of maintaining an ideal CMS environment. Minimizing intercell part traffics and EEs are the main objective of the cell formation problem because it is a critical point that improving production efficiency. Because the intercell moves could be changed according to the sequence of operation, it should be considered in assigning parts and machines to machine cell. This paper presents a method that eliminates EEs under the constraints of machine duplication cost and cell space capacity attaining two goals of minimizing machine duplications and minimizing intercell moves simultaneously. Developing an algorithm that calculates the machine duplications by cell-machine incidence matrix and part-machine incidence matrix. and calculates the exact intercell moves considering the sequence of operation. based on the number of machine duplications and exact intercell moves. the goal programming model which satisfying minimum machine duplications and minimum intercell moves is developed. A linear programming model is suggested that could calculates more effectively without damaging optimal solution. A numerical example is provided to illustrate these methods.