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철도 노반용 합성고무계 개질아스팔트의 유변학적 물성 평가
김혁중(Hyeok J. Kim),이진욱(Jin W. Lee),박준상(Jun S. Park),박대욱(Dae W. Park),나일호(Il-Ho Na) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
본 연구에서는 철도노반용 재료로써 SBS개질제를 첨가하여 PG76-22등급을 만족하면서 고온 소성변형 및 수분민감성 개선을 목표로 실험을 수행하였다. 당 연구에서 특화된 개질 아스팔트를 사용하는 목적으로는 첫째, 기존 자갈/슬래브궤도 대비 유지보수의 편의성과 경제성 제고. 둘째, 차별화 성능(저진동/소음,장기 공용성 확보) 구현이다. 이에, 금번 연구에서는 연차별 수행된 선행 연구의 실험 결과를 기반으로 합성 고무계(SBS) 제품과 기능성 첨가제를 컴파운딩하여 최적 배합을 도출하였다. 또한, 아스콘 플랜트의 생산성 제고 및 품질 안정성 기준 만족하기 위해 개발된 개질제의‘상분리 제어, 배합조건 최적화(용융속도 및 시간)’등 유변학적 물성 및 혼합물 평가를 통해 철도노반용 재료로써의 최적 물성을 도출하고자 한다. In this study, the experiment was performed to optimize the properties of high temperature rutting resistance and the moisture susceptibility using SBS modifier to satisfy with PG 76-22 grade for the railway roadbed. We used a modified asphalt specialized in railway. The purpose of using a specific modified asphalt is providing economic efficiency and maintenance compared to the original track, and differentiated performance (vibration / noise, long-term performance). Thus, this study were derived modified asphalt based on the optimal formulation by mixing synthetic rubber (SBS) and the functional additive through the study of several years. In addition, we performed an evaluation of the rheological properties of asphalt modifiers(the control of phase separation, melting time of modifier) to meet asphalt plant productivity and the standard of quality stability.
Design and fabrication of 2-DOF scanning mirror with Polydimethylsiloxane sloped electrode
J.Y. Jin(진주영),J.H. Park(박재형),B.W. Yoo(유병욱),Yun-Ho Jang(장윤호),I.H. Park(박일흥),Y.K. Kim(김용권) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this paper, we present a simple fabrication process for sloped electrodes in 2-degree of fredom(DOF) scanning micromirror employing pholydimethylsiloxane(PDMS). Using this process, quasi-conic figure electrode is successfully fabricated on the substrate. Simulation results show sloped electrodes decrease actuation voltage down to 22% compared with parallel plate type of electrodes having the same electrode area.
오재호 ( Jai-ho Oh ),심지한 ( J. H. Shim ),오지원 ( J. W. Oh ),허모랑 ( M. R. Hue ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
A method was developed to estimate a synthetic precipitation record for ungauged sites using irregular coarse observations. The proposed synthetic precipitation data were produced with ultra-high hourly resolution on a regular 1 × 1 km grid. The proposed method was used to analyze selected real-time observational data collected in South Korea from 2010 to the end of 2014. The observed precipitation data were measured using the Automatic Weather System and Automated Synoptic Observing System. The principal objective of the proposed method was to estimate the additional effects of orography on precipitation introduced by ultra-high-resolution (1 × 1 km) topography provided by a digital elevation model. The Global Forecast System analysis of the National Centers for Environmental Prediction was used for the upper atmospheric conditions, necessary for estimating the orographic effects. Precipitation data from 48 of the more than 600 observation sites used in the study, which matched the grid points of the synthetic data, were not included in the synthetic data estimation. Instead, these data were used to evaluate the proposed method by direct comparison with the real observations at these sites. A bias score was investigated by comparison of the synthetic precipitation data with the observations. In this comparison, the number of Hit, False, Miss, and Correct results for 2010-2014 was 74738, 25778, 7544, and 367981, respectively. In the Hit cases, the bias score was 1.22 and the correlation coefficient was 0.74. The means of the differences between the synthetic data and the observations were 0.3, -3.9, -14.4, and -34.9 mm h-1 and the root mean square errors (RMSEs) were 2.7, 8.3, 19.3, and 39.6 mm h-1 for the categories of 0.5-10.0, 10.0-30.0, 30.0-50.0, and 50.0-100.0 mm h-1, respectively. In addition, in each range, the 60% difference between the synthetic precipitation data and the observation data was - 1.5 to +1.5, -5.0 to +5.0, -17.0 to +17.0, and -33.0 to +33.0 mm h-1, respectively. Overall, the correlation coefficient of the synthetic precipitation data was >0.7 for 43 of the 48 test stations and the RMSE was <4 mm h-1 at 31 stations. The results are significant at all evaluation stations at the 0.05 significance level. This synthetic ultra-high resolution precipitation data may be used to verify the radar precipitation algorithm to overcome the limitation of the observation in operation.
10 한국인 염증성장질환 환자에서 Natural Resistance-Associated Macrophage Protein 1 (NRAMP1) 유전자의 촉진자 부위의 다형성
이병욱 ( B. W. Lee ),김효종 ( H. J. Kim ),지성길 ( S. G. Chi ),이길연 ( G. Y. Lee ),정용희 ( Y. H. Jung ),한요셉 ( Yo Seb Han ),동석호 ( Seok Ho Dong ),김병호 ( Byung Ho Kim ),장영운 ( Young Woon Chang ),장린 ( Rin Chang ),이정일 ( 대한소화기학회 2002 대한소화기학회 추계학술대회 Vol.2002 No.-
방사형차트를 이용한 국가 에너지 및 전력 생산원의 사회적 영향 종합평가
김태운(T.W. Kim),김성호(S. Ho Kim),문기환(K.-H. Moon),하재주(J.J. Ha),김홍채(H.C. Kim),장순홍(S.H. Chang) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-
국가의 다양한 전력생산시스템(원자력, 석탄, 중유, LNG, 수력 발전원 등)에 대한 사회적 영향을 종합적으로 비교하기 위하여 고려된 평가항목으로서 산업적 경제성, 개인적 보건영향(리스크), 환경영향 및 국가차원의 기여도 등이 선택되었다. 각 평가항목은 특히 발전단가, 추정사망자수, 이산화탄소 배출량, 연료수급 안정성 등에 의하여 대표되었다. 이러한 다기준 의사결정 문제의 평가방법을 개발하기 위한 예비적 연구단계로서 방사형 차트를 이용한 표현방법을 도입하였다. 이 연구에서는 이러한 사회적 영향 다이어그램을 이용하여 각 발전원의 사회적 영향의 다른 점을 쉽게 가시화할 수 있었다. 이 연구결과에 기초하여 정성적/정량적 종합비교 방법론이 개발될 예정이다. In the present work, for various energy and electricity generating systems to be compared in view of integrated social impacts, nuclear, coal-fired, heavy oil-fired, and LNG, and hydroelectricity systems are considered as electricity generating options. The following assessment factors are selected: economic effect, health effect, environmental effect, and benefit at the national level. As a preliminary study, these factors are represented as power generation cost, estimated mortality. Carbon Dioxide gas emission, and fuel supply stability, respectively. For integrated representation of a multi-criteria decision-making (MCDM) problem, radar charts are introduced to facilitate a comparative recognition of estimates. In the near future, based on the estimates, a MCDM methodology for both qualitative and quantitative comparison will be developed.