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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.
채널의 길이가 짧은 NMOS 트랜지스터의 Threshold 전압과 Punchthrough 전압의 감소에 관한 실험적연구
이원식,임형규,김보우,Lee, Won-Sik,Im, Hyeong-Gyu,Kim, Bo-U 대한전자공학회 1983 전자공학회지 Vol.20 No.2
MOS 트랜지스터의 채널이 짧아짐에 따라 threshold 전압과 punchthrough 전압이 감소하는 현상을 실리콘 게이트 NMOS 기술로 제작한 소자로써 실험적으로 관찰하였다. 또한 게이트 산화막의 두께를 50nm와 70nm로 감소시키고 보론(boron)을 임플랜트한 소자를 제작하여 게이트 산화막의 두께와 서브스트레이트의 불순물의 농도가 threshold 전압과 Punchthrough 전압의 감소에 미치는 영향을 측정하였다. 또 채널의 길이가 3㎛인 소자에 대하여 hot-electron의 방출을 플로우팅 게이트 패준 방법에 의하여 측정하였으며 그 결과 채널의 길이가 3㎛까지는 hot-electron의 방출은 문제가 되진 않음을 관찰하였다. The reduction of threshold voltage and punchthrough voltage of short channel MOS transistors has been measured experimentally with silicon gate NMOS transistors. The effects of the gate oxide thickness and substrate doping concentration on the threshold voltage and punch-through voltage have also been measured with sample devices with boron implantation and gate oxide thickness of 50 nm and 70 nm. Hot electron emission has been measured by floating gate method for the samples with 3 ${\mu}{\textrm}{m}$ channel length. It has been concluded from this measurement that hot electron emission is not significant for the channel length of 3${\mu}{\textrm}{m}$.
SAFETY KOREA 제품안전 칼럼 - 일본의 제품사고 정보 활용법
이원식,Lee, Won-Sik 기술표준원 2011 기술표준 Vol.110 No.-
소비자의 안전을 위하여 우리나라에 "제품안전 기본법"이 있다면 일본에는 "소비생활용 제품안전법"이 있다. 일본에선 제품사고 정보를 어떻게 활용하는지 소비자에 대한 홍보를 중심으로 간단히 살펴보았다.
이원식,이승미,구혜원,박병주,Lee, Won-Sik,Lee, Seung-Mi,Koo, Hye-Won,Park, Byung-Joo 대한예방의학회 2002 Journal of Preventive Medicine and Public Health Vol.35 No.1
Objectives : To review the drug prescription pattern of antiulcerative agents for elderly inpatients, Methods : The study population comprised inpatients of community hospitals who were members of the Korean Elderly Pharmacoepidemiologic Cohort (KEPEC), aged 65 years or over, beneficiaries of the Korea Medical Insurance Corporation (KMIC) and residing in Busan city in 1993. The drug prescription information was collected from the claims data of hospitals where the cohort members received medical care between January 1993 and December 1594. The information included personal identification, age, gender, diagnosis, drug dosage, date of hospital admission and name of medical institutions where the study subjects received drug prescriptions. The data analysis produced outcomes in terms of distribution of antiulcerative agents by class and by medical institution and trend of relative prescription, Analysis was also performed in terms of combined prescriptions of antiulceratives and drugs that could induce risk from drug interaction with antiulceratives. Results : The number of patients prescribed antiulcerative agents was 1,059 (64,9%) male and 1,724 (65.5%) female among the total inpatients. An antacid and composite agent was the most frequently prescribed antiulcerative agent (70.8%), followed by $H_2$ antagonist (16.0%), Among the potential drugs that could induce risk from drug interaction with the antiulcerative agents, diazepam was the most frequently prescribed. The proportion of diazepam co-prescription was 22.5% of the total cimetidine prescriptions and 14.5% of the fetal omeprazole prescriptions. Conclusions : Antiulcerative drugs were frequently prescribed in the elderly inpatients. The adverse drug reaction could possibly be due to drug interaction. The study results could be used as fundamental data for further drug utilization review of antiulceratiye agents.
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.