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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.
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.
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.
일반논문 : 지방자치단체 책임운영기관 제도의 성과와 과제: 서울특별시 사례의 진단,평가를 중심으로
이경호 ( Kyoung Ho Lee ),김정욱 ( Jeong Uk Kim ) 한국지방행정연구원 2012 地方行政硏究 Vol.26 No.1
이 연구는 지방자치단체 중 최초이자 유일하게 책임운영기관 제도를 도입·운영하고 있는 서울시의 사례를 중심으로 지방자치단체 책임운영기관 제도의 현황과 문제점을 진단 및 평가하고 실태조사에 기초하여 개선방안을 도출하였다. 중앙정부와 지방자치단체의 역할과 기능적 특성을 고려할 때, 책임운영기관 제도는 상대적으로 사업·집행 업무의 비중이 높은 지방자치단체에서 보다 적합할 것이다. 따라서 지방자치단체에서는 급변하는 행정환경에 탄력적이고 능동적으로 대응하는 대안적 조직관리 방식으로서 책임운영기관 제도를 적극 활용할 필요가 있다. 이 연구의 결과를 토대로 책임운영기관의 조직, 인사, 예산·회계, 평가 등에 대한 자율성 및 책임성이 충분히 발현될 수 있도록 제도를 운영한다면, 지방자치단체 책임운영기관 제도의 성공적인 정착과 확산은 물론 관리역량 강화 및 사업운영 성과 제고 등 제도 운영의 내실화를 도모할 수 있을 것으로 기대한다. This study aims to review and diagnosis the experiences of three executive agencies in Seoul Metropolitan Government. It has been 3 years since executive agency system was introduced to Seoul Metropolitan Government in 2008. The executive agency system has been considered to be one of major innovative organizational experiments in the Seoul Metropolitan Government. The agencification have shown more performance orientation in positive side and still weak managerial autonomy and accountability in negative side. This study suggests that the scope of the agencification should need to be expanded after the institutional improvements of autonomy and accountability.
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.
난방ㆍ급탕설비의 고효율 전기화를 통한 주택 저탄소화 간략평가
이경호(Lee Kyoung-Ho) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)
This paper describes a simplified evaluation of heating systems using diesel oil, gas, and electricity. In general, energy consumption for space and water heating accounts for more than 70% in the residential house sector in Korea. It would be effective to reduce energy consumption of the residential heating sector in terms of energy conservation and green house gas reduction. In this study, the RETScreen software program was used to evaluate the impact of fuels for the heating systems on annual fuel consumption and CO2 gas emissions. Required heating energy per unit area of residential building such as apartment building and single housing was used for the heating analysis of the RETScreen program. For the heating systems using electricity, heat pump system was considered and the seasonal COP (coefficient of performance) was varied 1.0 to 4.0 to consider the effect of different heat sources of heat pump such as air heat source, geothermal heat source and so on. As a result of the calculation, heat pump system using electricity as driving energy source showed best performance in terms of energy consumption. Higher efficient gas-fired boiler with efficiency of 0.98 and heat pump system with COP higher than 3.0 showed better performance regarding CO2 gas emissions than conventional boiler using gas and oil.