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궤도형 전투차량의 궤도박리 발생 및 성장모드 예측에 관한 연구
이경호,박병훈,Lee, Kyoung-Ho,Park, Byoung-Hoon 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3
In this paper, we have proposed a simple finite element model for separation mode analysis on the roadwheel and track assembly of main battle tank and established a contact stress-based mechanism which could explain the initiation and growth of separation defect occurred during the test of padreplacable track. It was proved that the longitudinal contact shear stress component on the pin hole region of the track shoe body which is parallel to the driving direction is consistent with the crack initiation at the bonding surface between track shoe and wheel-side rubber. The longitudinal shear stress increased locally near the separated region after the separation initiated. So we could assume that the local stress concentration accelerates the separation growth according to the shear mode.
궤도차량용 휠의 내구성 예측을 위한 유한요소 해석 기법 연구
이경호,노근래,이영신,Lee, Kyoung-Ho,Roh, Keun-Lae,Lee, Young-Shin 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.5
The idler wheel installed at the front side of the newly developed tracked vehicle didn't meet the durability requirement by showing the crack failure near the jointed region at the wheel during the field test. To find the crack developing mechanism we constructed finite element model for the idler wheel representing the behavior of interface between each suspension units, material properties from the material test data and actual loading conditions. This paper shows a result that maximum von Mises stress near the bolt hole on the outer rim is higher than inner idler coressponding to the actual test result and that result was reversed by adopting the reinforcement outside of the outer rim.
유한요소법을 이용한 궤도용 고무패드의 마모 예측 및 설계에 관한 연구
이경호,노근래,이영신,Lee, Kyoung-Ho,Roh, Keun-Lae,Lee, Young-Sin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5
In this paper, we have proposed a wear growth prediction method on the surface of rubber pad of track assembly installed in high-speed battle tank i.e. the automatic model updating code interfacing with commercial finite element simulation software. Also, simple and resonable geometrical, material finite element model was established to be easily updated based on the empirical threshold value of contact pressure on the contact surface. From the iterative model update and analysis results, we discovered a weak point on rubber pad surface and suggested a new design concept for improving the wear performance of track assembly.
콜타르가 함유된 페이트 사용 조선업 근로자에서 요중 1-hydroxypyrene glucuronide와 대사효소 유전자 다형성에 관한 연구
이경호(Kyoung-Ho Lee),이정미(Jeongmi Lee),최인미(Inmi Choi),김재용(Jaiyong Kim),임형준(Hyungjune Im),이상윤(Sang-Yun Lee),윤기정(Kijung Yoon),고상백(Sang Back Koh),최홍렬(Hong Ryul Choi),조수헌(Soo-Hun Cho),강대희(Daehee Kang) 한국환경성돌연변이발암원학회 2000 한국환경성돌연변이·발암원학회지 Vol.20 No.1
Although shipbuilding workers were exposed to a variety of genotoxic compounds including polycyclic aromatic hydrocarbons (PAHs), limited number of studies were conducted to evaluate the biomarkers related to PAH exposure in painting workers in shipbuilding industry. One hundred and thirty three workers<br/> including 73 employees using coal tar paints were recruited from a shipbuilding company located in South Korea. Urinary 1-hydroxypyrene glucuronide (1-OHPG), as internal dose of PAH exposure, were measured by synchronous fluorescence spectroscopy after immunoaffinity purification using monoclonal antibody 8E11. Glutathione S-transferase (GST)M1 and GSTT1 genotypes were assessed by multiplex PCR. Information on demographic characteristics, smoking habit, diet, job title, use of personal protective equipments were collected by self-administered questionnaire. Urinary 1-OHPG were higher in workers using coal tar paints than in workers using general paints, however, the difference was not statistically significant (p=0.20, Mann-Whitney U test). Urinary<br/> 1-OHPG levels in smokers were higher than in non-smokers (p<0.05 by Mann-Whitney U test) and there was a significant increase in urinary 1-OHPG levels with the numbers of cigarettes consumed per day (Spearman's correlation coefficient=0.28, p=0.02). Genetic polymorphisms of GSTM1 and GSTT1 did not influence the level of 1-OHPG in study subjects. Multiple regression analysis show that smoking is the only significant predictor for log-transformed 1-OHPG (overall model R²=0.1). These results suggest that workers using coal tar paints were exposed to significant amount of PAHs and individual difference in xenobiotic metabolism might affect the<br/> levels of internal dose of PAHs.