http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
노반재료의 소성침하 예측식을 이용한 강화노반 두께 산정
신은철(Shin Eun-Chul),양희생(Yang Hee-Saeng),최찬용(Choi Chan-Yong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Design of the reinforced roadbed thickness is concerned with safe operation of trains at specified levels of speed, axle load and tonnage. There are two methods for evaluating it. One is using an experimental equation and the other is using elastic theory with considering axle load, material properties of subsoils and allowable elastic settlement. Multi-layered theory is used to determine reinforced roadbed thickness by RTRI. Although their reinforced roadbed thickness is designed with an objective of achieving a minimum standard 2.5㎜ of settlement on the subgrade surface, it is hardly applied to real design. Li(1994) has suggested the experimental model which design approach is to limit plastic strain and deformations for the design period. It is worth due to adopting soil equivalent number of repeated load application. Moreover, it has been a more advanced method than existing design methods because including resilient modulus of subsoil beneath track, soil deviator stress caused by train axle loads and MGT. In this paper, it is analyzed under domestic track conditions to estimate the reinforced roadbed thickness with different soil types.
GEOTRACK을 이용한 궤도변수에 따른 침하 및 응력 특성 분석
신은철(Shin Eun-Chul),이한진(Lee Han-Jin),강정구(Kang Jeong-Gu),양희생(Yang Hee-Saeng) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Railroad track consists of relatively simple structures such as rail, sleeper, ballast. Roadbed shares vertical pressure by train load which passed through rail to ballast as base that supports the track. For evaluating stress and displacement of roadbed due to the railroad load is an important role on the track as a basic data for estimation of the durability and design of the roadbed thickness. GEOTRACK program applied multi-layered theory was developed for analyzing railroad track structure. GEOTRACK program is a sort of numerical analysis program which has advantage that can analysis component of track by simple method. In this study, this program was used to preform the numerical analysis by changing track conditions and roadbed conditions such as tie, reinforced roadbed, dynamic wheel load, Resilient modulus and so on. Further detail will be presented on the paper.
梁熙生 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-
Examfnation of 374 Korean students, 22 to 24 years of age performed for the estimation of oral hygiene condition and dontal caries prevalence with ageing. Oral hygiene condition was determined according to the Simplified Oral Hygiene Index outlined by Greene and vermilion and the dental cnories Prevalence and individual dental status were tabulated as the percent affected and average number of DMF Teeth. The results obtained from this study showed average 90.09 percent affected by dental caries for total subject and 6.39 DMF Teeth per person. An average of the Simplified Dral Hygiene Index obtained from total subject showed 3.42 per person. No correlation neith positive or negative could be demonstrated between oral hygiene condition and dental caries prevalence in this sample subject. This does not negate the necessity for further study of the relationship bet between dental caries prevalence and oral hygiene condition in persons of large sample subjects.