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이상화,이호인 ( Sang Hwa Lee,Ho In Lee ) 한국공업화학회 1993 공업화학 Vol.4 No.3
담지된 백금촉매에 주석의 첨가는 포화탄화수소의 탈수소고리화 반응에 대한 촉매의 활성 및 안정도의 현저한 증가를 가져왔다. n-octane의 탈수소고리화 반응에서 0.75wt%의 Pt에 대해 주석의 몰비가 약 4일 때 가장 높은 촉매적 활성을 나타냈다. 또한 K의 첨가도 n-hexane의 탈수소고리화 반응에 대해 주석과 비슷한 효과를 나타내었다. n-octane의 전환반응의 경우에는, K의 첨가 효과가 적게 나타났다. The addition of Sn to Pt/γ-Al_2O_3 catalyst greatly enhanced the activity and decreased the deactivation rate for the dehydrocyclization of paraffins. For the dehydrocyclization of n-octane, there appeared to be an optimal ratio of Pt:Sn= 1 :4 for 0.75 wt% Pt/γ-Al_2O_3 catalyst. The addition of K to Pt/γ-Al_2O_3 also produced a similar effect on the dehydrocyclization of n-hexane. In the case of n-octane, the addition of K led to a less selective catalyst.
노동현장 기준데이터 제시를 위한 손근육의 근활성도 및 근피로도에 관한 연구
金慶鉉(Kyoung-Hyun Kim),李浩龍(Ho-Yong Lee),辛華詠(Hwa-Young Shin),鄭聖勳(Seong-Hun Jeong),金成煥(Sung-Hwan Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.12
In this paper, muscular activity and muscle fatigue of FDI (first dorsal interosseous muscle) and thenar muscle of hand was analyzed with surface EMG signal based on four kinds of attitudes (grip, tip, key and palmar) to measure grip strength and pinch strength after hand operation and rehabilitation treatment. The normative data are needed to interpret evaluation data to assess a patient's ability to return to labor environment. The preceding researchers proposed the standard data only by studying on maximum grip strength and the maximum pinch strength followed by each attitude of subjects' hands. But in this study, Ole muscle activity and muscle fatigue were considered under the various attitude to propose normative data. As a results, the muscle fatigue may be used only for presentation of normative data in labor environment.
VVVF 도시철도 차량의 신뢰성 평가 시스템 개발에 관한 연구
배철호(Chul-Ho Bae),김성빈(Sung-Bin Kim),이호용(Ho-Yong Lee),장석화(Suk-Hwa Chang),서명원(Myung-Won Suh) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.5
Over the past twenty years, the maintenance system has been developed and its importance has been increased. For the effective maintenance of the urban transit, we have developed the maintenance system based on the concept of RCM(Reliability Centered Maintenance). RCM analysis is a systematic approach to developing a cost-effective maintenance strategy based on the various components's reliability of the system in question. It is performed according to process that includes the following steps; definition of function and functional failures of the systems, construction of RBD(Reliability Block Diagram), performance of FMEA(Failure Modes & Effects Analysis) and calculation of the reliability index. The final process of RCM is to determine appropriate failure maintenance strategies. This paper aims to define the procedure of maintenace based on the concept of RCM for urban transit. The key for a successful maintenance system is an automated scheduling to the maximum extent possible and timely executions. The developed system issues maintenance plan and repair request based on analyzed data and maintenance experience.
박성기 ( Park Seong Gi ),최재식 ( Choe Jae Sig ),이상화 ( Lee Sang Hwa ),이호인 ( Lee Ho In ) 한국공업화학회 2003 공업화학 Vol.14 No.5
La_(1-x)Sr_(x)CoO₃ (x=0.0, 0.2, 0.4, 0.6)계 페롭스카이트형 산화물을 산소전극 촉매로 이용한 알칼리형 연료전지의 산소환원 반응에 대하여 연구하였다. Temperature-programmed reduction/oxidation (TPR/TPO) 기법을 통하여, 페롭스카이트 구조내의 격자산소의 거동을 조사하였다. 연료전지의 전류 밀도는 x=0.2일 때 가장 높은 값을 보였으며, x=0.2, 0.4, 0.0, 0.6의 순서로 감소하였다. TPR 실험에서는, 사용된 모든 페롭스카이트 산화물이 650 K 부근의 α 피크과 700 K 부근의 β 피크를 보였으며, TPO 실험의 경우는 넓은 온도범위에 걸친 단일 피크가 나타났다. 각 페롭스카이트들의 환원반응과 재산화 반응의 활성화에너지를 Arrhenius plot을 통하여 구하였으며, TPR의 α 피크에 해당하는 환원반응의 활성화에너지가 작을수록 연료전지에서의 전류밀도는 크게 나타났다. 이로부터, TPR의 α 피크와 연관이 있는 격자산소가 연료전지의 산소환원 반응에 참여하는 활성종임을 알 수 있었다. The oxygen reduction in alkaline fuel cell was studied with La_(l-x)Sr_(x)CoO_(3) (x = 0.0, 0.2, 0.4, 0.6) perovskite-type oxides as oxygen electrode. The behavior of lattice oxygen of perovskite structure was examined by temperature-programmed reduction/oxidation(TPR/TPO) method. The maximum current density was occurred at x = 0.2 and decreased by the order of x = 0.2, 0.4, 0.0, and 0.6. In TPR experiments, all the perovskites gave a peak at about 650K and βpeak at about 700 K, while a broad single peak was observed in TPO experiment. Activation energies of reduction and re-oxidation of perovskites were calculated by Arrhenius plot. The smaller the activation energy of TPR a peak, the larger the current density of fuel cell suggesting that the lattice oxygen for TPR a peak is the active species for oxygen reduction in alkaline fuel cell.