http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
소각장 근로자에서 GSTM1의 유전자 다형성이 glycophorin A 변이 발현율과 소변내 PAH 대사산물 농도와의 관계에 미치는 영향
이경호(Kyoung-Ho Lee),하미나(Mina Ha),최재욱(Jae-Wook Choi),조수헌(Soo-Hun Cho),박정규(Chung-Gyu Park),황응수(Eung-Soo Hwang),강대희(Daehee Kang) 한국환경성돌연변이발암원학회 2001 한국환경성돌연변이·발암원학회지 Vol.21 No.2
Eighty-one workers including 38 employees directly incinerating industry wastes were recruited from a company located in South Korea. To evaluate the association between urinary 1-hydroxypyrene glucuronide (1-OHPG) levels, as internal dose of polycyclic aromatic hydrocarbon (PAH) exposure, and glycophorin A (GPA) mutation frequency, as an early biologic effect indicator. Urinary 1-OHPG levels were measured by synchronous fluorescence spectroscopy after immunoaffinity purification using monoclonal antibody 8E11. Erythrocyte GPA variant frequency (NN or NO) was assessed in MN heterozygotes with a flow cytometic assay. The GSTM1 and GSTT1 genotypes were assessed by a multiplex PCR method. The GPA NN phenotype frequency was higher in occupationally exposed group (n=14, mean±S.D. 6.6±12.0 in 106 erythrocyte cells)<br/> than in non-exposed group (n=22, 2.1±3.5). Similarly, the GPA(NO or NN) phenotype frequency was higher in exposed group (n=14, 9.7±17.3) than non-exposed group (n=22, 4.2 ± 6.3). The above differences failed to reach statistical significance, but a significant increase was seen in GPA variant frequency levels with increase in urinary 1-OHPG levels (Spearman's correlation: p=0.06 (NO), p=0.07 (NO or NN)). When this association was evaluated by GSTM1 genotype status, the association between GPA mutation and urinary 1-OHPG levels was stronger in individuals with GSTM1 present genotype (Spearmans correlation; r=0.50, p=0.02). These<br/> results suggest that the association between urinary 1-OHPG and GPA mutation is be modulated by the GSTM1 genotype.
산업폐기물 소각장 근로자에서 요중 PAHs 대사 산물과 혈중 aromatic-DNA adducts
이경호(Kyoung-Ho Lee),Masayoshi Ichiba(Masayoshi Ichiba),최인미(Inmi Choi),최재욱(Jae-wook Choi),조수헌(Soo-Hun Cho),강대희(Daehee Kang) 한국환경성돌연변이발암원학회 2002 한국환경성돌연변이·발암원학회지 Vol.22 No.4
This study evaluated the concentrations of urinary metabolites of polycyclic aromatic hydrocarbons (PAHs) in industrial waste incineration workers. The effect of genetic polymorphisms of xenobiotic metabolism enzymes on urinary concentration of PAH metabolites was assessed. And, aromatic DNA adduct levels were<br/> also determined in total white blood cells. Fifty employees were recruited from a company handling industrial wastes located in Ansan, Korea: non-exposed group (n=21), exposed group (n=29). Sixteen ambient PAHs were determined by GC/MSD (NIOSH method) from personal breathing zone samples of nine subjects near incinerators.<br/> Urinary 1-hydroxypyrene glucuronide (1-OHPG), a major pyrene metabolite, was assayed by synchronous fluorescence spectroscopy after immunoaffinity purification using monoclonal antibody 8E11 (SFS/IAC). Multiplex PCR was used for genotyping for GSTM1/T1 and PCR-RFLP for genotyping of CYP1A1 (MspI and Ile/Val). PAH-DNA adducts in peripheral blood WBC were measured by the nuclease P1-enhanced postlabeling assay. Smoking habit, demographic and occupational information were collected by self-administered questionnaire. The range of total ambient PAH levels were 0.00-7.00 mg/㎥ (mean 3.31). Urinary 1-OHPG levels were significantly higher in workers handling industrial wastes than in those with presumed lower exposure to PAHs (p=0.006, by Kruskal-Wallis test). There was a statistically significant dose-response increase in 1-OHPG levels<br/> with the number of cigarettes consumed per day (Pearson correlation coefficient=0.686, p<0.001). Urinary 1-OHPG levels in occupationally exposed smoking workers were highest compared with non-occupationally exposed smokers (p=0.053, by Kruskal-Wallis test). Smoking and GSTM1 genotype were significant predictors for<br/> log-transformed 1-OHPG by multiple regression analysis (overall model R²=0.565, p<0.001), whereas smoking was the only significant predictor for log-transformed aromatic DNA adducts (overall model R²=0.249, p=0.201). Aromatic DNA adducts was also a significantly correlation between log transferred urinary 1-OHPG levels (pearson's correlation coefficient=0.307, p=0.04). However, the partial correlation coefficient adjusting for Age, Sex, and<br/> cigarette consumption was not significant (r=0.154, p=0.169). The significant association exists only in individuals with the GSTM1 null genotype (pearsons correlation coefficient=0.516, p=0.010; partial correlation coefficient adjusting for age, sex, and cigarette consumption, r=0.363, p=0.038). Our results suggest that the significant increase in urinary 1-OHPG in the exposed workers is due to higher prevalence of smokers among them, and that the association between urinary PAH metabolites and aromatic DNA adducts in workers of industrial waste handling may be modulated by GSTM1 genotype. There results remain to be confirmed in future larger studies.