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에너지저장용 MCMB 표면에 합성된 Li4Ti5O12의 전기화학적 특성
최창해 ( Chang Hae Choi ),박수길 ( Soo Gil Park ) 충북대학교 건설기술연구소 2011 建設技術論文集 Vol.30 No.1
The Li4Ti5O12/MCMB composite was prepared by sol-gel process with ultrasonication. The prepared composite materials were analyzed by SEM, XRD, and XPS, and their electrochemical characteristics were investigated by cyclic voltammetry and charge-discharge characteristics in 1 M LiBF4/EC+DMC as an electrolyte. From the results, the LTO particles composited on MCMB surface had an average particle size of 100 nm and showed spinel-frame structure. Specific capacity of composited materials were measured 112 mAh/g by charging-discharging in 0.8 C-rate. When the C-rate increases 3.9C, specific capacity ratio of LTO of composite materials were measured 58%, LTO/MCMB was 27%. At the result, LTO/MCMB composite materials enhanced characteristics of high-current discharge.
최창해 ( C H Choi ) 한국축산학회 1970 한국축산학회지 Vol.12 No.2
This experiment was carried out to test performance of domestic fowl. In this study 750 chickens were used-450 pure strain White Leghorns, 150 line cross White Leghorns and 150 crossbred Hamphorns. The results obtained were summrized as follows. 1. Viability from hatching to 60 days was 98.9±1.20%, that from 61 to 150 days was 96.7±1.72% and that from 151 to 500days was 81.5±5.90. 2. Age at sexual maturity was 183.6±5.09 days. The sexual maturity of crossbreds was about 15 days earlier than that of pure strain. 3. Egg production till 500 days on hen-day basis was 60.6±7.34% and that on hen-house basis was 195.5±9.01. Crossbreds were remarkably higher than other strains in egg production. 4. Egg weight showed a mean of 55.5±1.57g. 5. Body weight at 300 days of age was 1,918g. and that at 500 days of age was 1,958g. 6. In the chicken disease, the birds dying of Leukemia was most numerous, followed in rank by egg rupture.
최창일(Choi changil) 한국퍼실리티매니지먼트학회 2005 한국퍼실리티매니지먼트학회지 Vol.5 No.1
The purpose of this paper was to study a role and organization of CM. In 21th century driven by economic competitiveness, Owing to the globalization and the endless change in the construction industry. A construction market was required new, complex, complicated and competitive paradigm by a buyer. However, Up to now the definition of CM doesn’t clearly set up and an organization for CM project of Construction Company also isn’t established. So this paper was to study a role and organization of CM for the high Quality in the construction Industry.
EURO Ⅳ 대응 CPF 적용 차량의 선행 시험 결과 및 개발 방향
최창은(Changeun Choi),김진수(Jinsoo Kim),권우열(Wooyoul Kwon),김상래(Sangrae Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
EURO Ⅳ feasibility has been studied on the passenger diesel MT vehicle installed in line 4 cylinders, 2.0L, variable geometric turbocharged EURO Ⅲ engine with CPF application. We had met the EURO Ⅳ emission target with this system, but there were some problems such as EGR and VGT control collision and fuel economy deterioration. Also, we found that there is the optimized EGR rate between exhaust gas temperature and Lambda value for passive regeneration. These test results have shown that the EURO Ⅳ engine with low raw NOx should be developed. Also, subsystem for CPF like intake air heater and wee should be well matched systematically if they decide to apply.