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축방향 관통균열이 존재하는 증기발생기 세관의 파손확률 예측
문성인(Seong In Moon),이상민(Sang Min Lee),배성렬(Sung Ryul Bae),장윤석(Yoon Suk Chang),김영진(Young Jin Kim),황성식(Seong Sik Hwang),김정수(Joung Soo Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
The integrity of steam generator tubes in nuclear power plant should be maintained sufficiently during operation. For sake of this, complicated assessment procedures are required such as fracture mechanics analysis, etc. The integrity assessment of tubes has been performed by using conventional deterministic approaches while there are many uncertainties to carry out a rational evaluation. In this respect, probabilistic integrity assessment is considered as an alternative method for integrity assessment. The objectives of this study are to develop an integrity assessment system based on probabilistic fracture mechanics and to predict the failure probability of steam generator tubes containing an axial through-wall crack. The developed integrity assessment system consists of three evaluation modules, which apply first order reliability method, second order reliability method and Monte Carlo simulation method, respectively. The system has been applied to predict failure probability of steam generator tubes and the estimation results showed a promising applicability of the probabilistic integrity assessment system.
하이브리드 (활성탄소+LiCoO<sub>2</sub>) 전극의 전기화학적 특성
김익준,전민제,양선혜,김현수,문성인,오대희,Kim, Ick-Jun,Jeon, Min-Je,Yang, Sun-Hye,Kim, Hyun-Soo,Moon, Sung-In,Oh, Dae-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9
In this study, the hybrid electrodes, composed of the activated carbon powders and $LiCoO_{2}$ powders, were prepared as a cathode for the high-capacitance type hybrid capacitor, and the electrochemical properties of the hybrid electrodes were examined in terms of the weight composition and the milling time of $LiCoO_{2}$ powders. The specific volumetric capacities were increased with increasing of the composition of $LiCoO_{2}$ powders in the hybrid electrodes. On the other hand the coin cell capacitors, using the hybrid electrodes with $LiCoO_{2}$ poweders milled for 200 h, have exhibited the lower internal resistivities and the better capacity retention after 100 charge-discharge cycle than those of the coin cell capacitors using the hybrid electrodes with raw $LiCoO_{2}$ powders.
Polyoxyalkylene Glycol Acrylate기 Gel Polymer Electrolyte를 적용한 리튬이온폴리머전지의 전기화학적 특성
김현수,김성일,나성환,문성인,Kim, Hyun-Soo,Kim, Sung-Il,Na, Seong-Hwan,Moon, Seong-In 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.2
In this work, a gel polymer electrolyte (GPE) was prepared using polyoxyalkylene glycol acrylate (POAGA) as a macromonomer LiCoO$_2$/GPE/graphite cells were prepared and their electrochemical properties were evaluated at various current densities and temperatures. The ionic conductivity of the GPE was more than 6.2${\times}$10$^{-3}$ S$.$$cm^{-1}$ / at room temperature. The GPE had good electrochemical stability up to 4.5 V vs. Li/Li$^{+}$. POAGA-based cells were showed good electrochemical performances such as rate capability, low-temperature performance, and cycleability. The cells, also, passed a safety test such as the overcharge and nail-penetration test.t.
리튬이온폴리머전지용 가교형 겔폴리머전해질의 중합조건 최적화 연구
김현수,문성인,김상필,Kim, Hyun-Soo,Moon, Seong-In,Kim, Sang-Pil 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.1
In this work, polymerization conditions of the gel polymer electrolyte (GPE) were studied to obtain better electrochemical performances in a lithium-ion polymer battery. When the polymerization temperature and time of the GPE were 70$^{\circ}C$ and 70 min, respectively, the lithium polymer battery showed excellent a rate capability and cycleability. The TMPETA (trimethylolpropane ethoxylate triacrylate)/TEGDMA (triethylene glycol dimethacrylate)-based cells prepared under optimized polymerization conditions showed excellent rate capability and low-temperature performances: The discharge capacity of cells at 2 Crate showed 92.1 % against 0.2C rate. The cell at -20 $^{\circ}C$ also delivered 82.4 % of the discharge capacity at room temperature.
문성인(Seong-In moon),김민수(Min-Soo Kim),윤성진(Sung-Jin Yoon),전재욱(Jae-Wook Jeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Rubber components have been widely used in automotive industry as anti-vibration components for many years. These subjected to fluctuating loads, often fail due to the nucleation and growth of defects or cracks. In order to prevent such failures, it is necessary to understand the fatigue failure mechanism for rubber materials and to evaluate the fatigue life for rubber components. The objective of this study is to evaluate the fatigue failure mode and to select the applicable fatigue damage parameter for vulcanized rubber components. In order to investigate the applicability of the commonly used damage parameters, fatigue tests and corresponding finite element analyses and fatigue analyses for automotive rubber components were carried out. The fatigue failure mode was evaluated and the applicability of the fatigue damage parameters was verified. Thereby, strain energy density was proposed as the fatigue damage parameter for rubber components.