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김영록,정준화,이석기,Kim, Young Rok,Jeong, Jun Hwa,Lee, Suk Ki 한국도로학회 2015 한국도로학회논문집 Vol.17 No.4
PURPOSES : The purpose of this study is to revise the weight to power ratio of the representative truck in S. Korea. So far, S. Korea has been using the unit lb/hp, and the construction machines were not considered in the evaluation of the performance of trucks. METHODS : This study was performed to recommend the use of ISO system of units, and to analyze the weight to power ratios of the representative trucks in S. Korea, including the dump trucks, concrete mixer trucks, and asphalt and concrete diffusers. RESULTS: From this study, the 85 percentile value of the weight to power ratio of the trucks in S. Korea's was found to be 103.6 kg/kw. CONCLUSIONS : The performance standard for the representative truck has to be increased upward, considering the travel pattern of the dump trucks, concrete mixers, and asphalt and concrete diffuser trucks, travel distances, narrow area (work zone) of operation, and the saving in construction budget for climbing lane. Based on this study, the weight to power ratio of the representative truck in S. Korea could possibly be revised to 100~110 kg/kW.
김영록,신용수,Kim, Young Rock,Shin, Yong-Su 한국수학사학회 2017 Journal for history of mathematics Vol.30 No.3
In tropical geometry, the sum of two numbers is defined as the minimum, and the multiplication as the sum. As a way to build tropical plane curves, we could use Newton polygons or amoebas. We study one method to convert the representation of an algebraic variety from an image of a rational map to the zero set of some multivariate polynomials. Mikhalkin proved that complex curves can be replaced by tropical curves, and induced a combination formula which counts the number of tropical curves in complex projective plane. In this paper, we present close examinations of this particular combination formula.
김영록,오형직,박상영,박찬덕,박은서,임형철,Kim, Young-Rok,Oh, Jay,Park, Sang-Young,Park, Chandeok,Park, Eun-Seo,Lim, Hyung-Chul 한국천문학회 2012 天文學會報 Vol.37 No.2
In this study, we propose an effective strategy for precise orbital and geodetic parameter estimation using SLR (Satellite Laser Ranging) observations for ILRS AAC (Associate Analysis Center). The NASA/GSFC GEODYN II software and SLR normal point observations of LAGEOS-1, LAGEOS-2, ETALON-1, and ETALON-2 are utilized for precise orbital and geodetic parameter estimation. Weekly-based precise orbit determination strategy is applied to process SLR observations, and Precise Orbit Ephemeris (POE), TRF (Terrestrial Reference Frame), and EOPs (Earth Orientation Parameters) are obtained as products of ILRS AAC. For improved estimation results, selection strategies of dynamic and measurement models are experimently figured out and configurations of various estimation parameters are also carefully chosen. The results of orbit accuracy assessment of POE and precision analysis of TRF/EOPs for each case are compared with those of existing results. Finally, we find an appropriate strategy for precise orbital and geodetic parameter estimation using SLR observations for ILRS AAC.
김영록,신용수,Kim, Young Rock,Shin, Yong-Su 한국수학사학회 2016 Journal for history of mathematics Vol.29 No.5
In tropical geometry, the sum of two numbers is defined as the minimum, and the multiplication as the sum. We learned that dynamic programming in tropical algebraic geometry can be used to find the shortest path in graphs. We have also learned about the Bezout's Theorem, which is a theorem concerning the intersections of tropical plane curves, and the stable intersection principle.
10㎾급 태양광발전용 고주파링크 계통연계형 인버터의 개발
김영록(Youngroc Kim),나병훈(Byunghun Ra),김성환(Sunghwon Kim),손용훈(Younghoon Son),김은연(Eunyeon Kim) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
국내의 태양광발전용 계통 연계형 삼상 인버터는 대부분 저주파(60㎐) 변압기를 사용하는 절연형 인버터이다. 이 인버터의 경우 무변압기 또는 고주파 변압기 인버터에 비해 회로 및 제어가 간단하다. 하지만 무게나 부피가 상당히 크고, 소형화 하기 어려운 단점이 있다. 무변압기형 인버터의 경우 저주파 절연형 인버터에 비해 무게나 부피가 작고, 소형화 할 수 있으나, 계통과의 전기적 절연이 되지 않는 단점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위하여 태양광발전용 고주파링크 계통 연계형 삼상 인버터 시스템을 개발 하였다.