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Cobalt Oxime Sandwich형 화합물을 합성하기 위하여 Oxime류와 (${\eta}^5$-Cyclopentadienyl)cobalt를 포함하는 착물과의 반응
이원식,이혁,변상인,박영배,이광,엄재국,곽영우,김태정,Won-Sik Lee,Hyuk Lee,Sang-In Byun,Young-Bae Park,Kwang Lee,Jae-Kook Uhm,Young-Woo Kwak,Tae-Jeong Kim 대한화학회 1992 대한화학회지 Vol.36 No.2
Cobalt 금속 중심으로 cyclopentadienyl을 ${\pi}$-착물로 결합하고, 또 oxime 화합물을 리간드로 하는 cobalt oxime sandwich형 착물을 합성하기 위하여 본 연구를 수행하였다. Cyclopentadienyl-cobalt 부분을 도입하기 위해, (${\eta}^5$-Cyclopentadienyl)bis(ethylene)cobalt (Jonas 시약), (η5-cyclopentadienyl)di(carbonyl)cobalt, 그리고 bis(${\eta}^5$-cyclopentadienyl)cobalt (cobaltocene)의 착물이 사용되었고, oxime을 각각 여러 가지 조건에서 반응시켰다. 그 중에서 Jonas 시약과 dienemonooxime인 2,4-hexadienealdoxime만이 반응되었으며, 그 생성물은 예상을 벗어난 (${\eta}^5$-cyclopentadienyl)(2,4-hexadienenitrile)cobalt [VII]로 밝혀졌다. 이 화합물의 구조는 NMR, mass spectrometer, IR 원소분석기를 통해 확인되었다. (${\eta}^5$-Cyclopentadienyl)bis(ethylene)cobalt (Jonas reagent), (${\eta}^5$-cyclopentadienyl)di(carbonyl)cobalt, and bis(${\eta}^5$-cyclopentadienyl)cobalt (cobaltocene) were reacted with oximes, respectively, under various conditions for synthesizing cobalt oxime sandwich complex. Jonas reagent and a dienemonooxime, 2,4-hexadienealdoxime underwent the reaction. This produced unexpected compound, (${\eta}^5$-cyclopentadienyl)(2,4-hexadienenitrile)cobalt [VII]. The compound [VII] was identified by NMR, mass spectrometer, IR and elemental analyzer etc.
마이크로 분말사출성형에서 바인더 물성이 피드스탁 및 성형공정에 미치는 영향에 관한 연구
이원식,김용대,Lee, Won-sik,Kim, Yong-dae 한국금형공학회 2017 한국금형공학회지 Vol.11 No.3
The fabrication process of micro pattern structure with high precision and high aspect ratio using powder injection molding (PIM) is developed. In the PIM process, the metal powder is mixed with the binder systems and the mixture is injected into the metal mold. The injection molded green parts are debinded and sintered to reach final shape and properties. In this method, the optimization of physical properties such as fluidity and strength of the binder system is essential for perfect filling the high aspect ratio micro-pattern. For this purpose, the correlation between the properties of the binder system and feedstock and ${\mu}-PIM$ process was investigated, and a binder system with low viscosity at low temperature(about $110^{\circ}C$) and high strength after cooling was investigated and applied. Employing this process, high precision parts with line type micro pattern structure which has pattern size $160{\mu}m$ and aspect ratio more than 2 can be manufactured.
이원식,Lee, Won-Sik 한국기술사회 2009 技術士 Vol.42 No.3
As Korea's water resources are dominated by intense summer rainfall and steep mountainous territory, it is inevitable for most of the rainfall in Korea to flow into sea immediately and directly. It cannot help having severe conditions which droughts and floods occur repeatedly due to the seasonal and geological conditions in Korea. Those kinds of disasters will be expected more frequently and seriously in the future because of the unexpected climate changes in the world. Therefore, Korean government will plan to develop small and medium-size dams environmentally friendly, multi-regional water supply system continuously and alternative water resources such as river bank filtrations, rainwater storages and underground dams, in order to prevent floods as well as to secure stable water supply.
EIX 전극 제작과 이온교환 개발에 관한 연구 (Ⅰ) - EIX 전극 제조와 특성 평가 -
이원식,김래현,정택상,오세중 ( W . S . Lee,L . H . Kim,T . S . Jung,S . J . Oh ) 한국공업화학회 1995 공업화학 Vol.6 No.4
본 연구에서는 실험실에서 합성한 ZrP와 상업용 Amberlite IRP-64, Amberlite IRC-718 이온교환 수지를 SBR과 Epoxy 결합제로 사용하여 EIX전극을 제조하고, 전극전위에 따라 제조한 EIX 전극에 대한 구리이온의 흡·탈착성능과 특성을 고찰하였다. 이온의 전달특성은 결합제의 종류에 따라서 가장 크게 영향을 받았으며, 흡착공정에서 최대의 흡착속도를 보이는 최적의 전극 전위가 존재함을 확인할 수 있었으며, 탈착공정에서는 사용한 수지와 금속이온의 흡착력에 의해서 가장 크게 영향을 미쳤다. EIX electrodes containing cation exchange resins(ZrP, Amberlite) and binders(SBR, Epoxy) were fabricated in different drying conditions of various temperature and pressure. The performance and physical properties of those were measured and the adsorption and desorption kinetics in copper sulfate solution were investigated at the various electrode potentials. The ionic transport in EIX electrode was seriously affected by binder system. The maximum adsorption rate of copper was obtained at optimum cathodic potential. In elution process, the desorption rate was significantly influenced by adsorpted force between the resin and the metal ions.
600W급 IPMSM의 구동특성 변화에 따른 온도 내력 분석
이원식(Wonsik_Lee),고덕화(Duk-Hwa Go),김용태(Yong-Tae Kim),조규원(Gyu-Won Cho),김규탁(Gyu Tak Kim) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.10
본 논문에서는 동일 출력에서 연기전력 증가 및 형상 변경을 통한 효율 향상 전동기와 기본모델 전동기를 열 등가회로망법을 사용한 열해석을 수행하여 온도 내력을 비교, 분석하였다.