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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 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,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.
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.
정상 성대 기능을 가진 갑상선유두암종 환자에서 암 침윤이 있는 반회후두신경 보존의 기능적, 종양학적 결과
김영록 ( Young Rok Kim ),김주연 ( Joo Yeun Kim ),김성원 ( Sung Won Kim ),이봉주 ( Bong Ju Lee ),차용우 ( Yong Woo Cha ),이강대 ( Kang Dae Lee ) 대한갑상선학회 2008 International Journal of Thyroidology Vol.1 No.2
Background and Objectives: Complete excision with resection of the recurrent laryngeal nerve (RLN) in differentiated papillary thyroid carcinoma (PTC) with invasion of RLN, reportedly did not improve the survival over incomplete excision. However some investigators have provided definitive oncologic and functional outcomes concerning the preservation of recurrent laryngeal nerve involved in thyroid cancer. Materials and Methods: The RLN involved by locally invasive papillary thyroid carcinoma was preserved in 15 patients with functioning vocal cord, between April 1998 and April 2004. Retrospective study was performed with medical records of 11 patients who were followed-up more than 48 months. All patients were treated by the shaving technique for RLN preservation. Postoperative radioiodine and thyroid stimulating hormone suppression therapy were combined for ablation of microscopic residual PTC. Results: Postoperative survival rate of the patients with RLN preservation was 100%, and local recurrence was not observed. There were 13 nerves showing infiltration by PTC during the operation. Permanent vocal cord paralysis was not observed and transient vocal cord paralysis occurred in 1 nerve (7.7%) of 1 patient. Conclusion: Although the number of patients and follow-up duration of the study may be limited, preservation of RLN infiltrated by PTC maintained the functioning vocal cord without any clinical recurrence.