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실사고 데이터를 이용한 EES에 따른 인체상해도 경향성 분석
이승상(Seungsang Lee),송영준(Youngjun Song),윤영한(Younghan Youn),이재완(Jaewan Lee),김시우(Siwoo Kim),이강현(Kanghyun Lee),이희영(Heeyoung Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Currently frontal crash safety evaluation is conducted by crashing a vehicle against a rigid barrier in Korea. It evaluate crash performance of a vehicle in a barrier test in terms of vehicle stiffness and strength. But this method is basic test. Probably, This test isn’t matched in Real World Crash Collision about occupant injury. So The availability of in-depth accident data is prerequisite for each efficient traffic safety management system. In this study, As using photo modeler program, It finds out relationship between occupant injury based on AIS and Estimated Energy Equivalent Speed in the real world in-depth accident data and compares crashing a vehicle test against a rigid barrier by using Madymo to Estimated Energy Equivalent Speed in the Real World in-depth accident data. Using Real World in-depth accident data is essential part of improving vehicle safety and reduction of traffic fatality in Korea.
Period and toroidal knot mosaics
Oh, Seungsang,Hong, Kyungpyo,Lee, Ho,Lee, Hwa Jeong,Yeon, Mi Jeong World Scientific Publishing Company 2017 Journal of knot theory and its ramifications Vol.26 No.5
<P>Knot mosaic theory was introduced by Lomonaco and Kauffman in the paper on ‘Quantum knots and mosaics’ to give a precise and workable definition of quantum knots, intended to represent an actual physical quantum system. A knot <TEX>$ (m,n)$</TEX>-mosaic is an <TEX>$ m \times n$</TEX> matrix whose entries are eleven mosaic tiles, representing a knot or a link by adjoining properly. In this paper, we introduce two variants of knot mosaics: period knot mosaics and toroidal knot mosaics, which are common features in physics and mathematics. We present an algorithm producing the exact enumeration of period knot <TEX>$ (m,n)$</TEX>-mosaics for any positive integers <TEX>$ m$</TEX> and <TEX>$ n$</TEX>, toroidal knot <TEX>$ (m,n)$</TEX>-mosaics for co-prime integers <TEX>$ m$</TEX> and <TEX>$ n$</TEX>, and furthermore toroidal knot <TEX>$ (p,p)$</TEX>-mosaics for a prime number <TEX>$ p$</TEX>. We also analyze the asymptotics of the growth rates of their cardinality.</P>
Stick number of spatial graphs
Lee, Minjung,No, Sungjong,Oh, Seungsang World Scientific Publishing Company 2017 Journal of knot theory and its ramifications Vol.26 No.14
<P>For a nontrivial knot <TEX>$ K$</TEX>, Negami found an upper bound on the stick number <TEX>$ s(K)$</TEX> in terms of its crossing number <TEX>$ c(K)$</TEX> which is <TEX>$ s(K) \leq 2c(K)$</TEX>. Later, Huh and Oh utilized the arc index <TEX>$ \alpha (K)$</TEX> to present a more precise upper bound <TEX>$ s(K) \leq \frac{3}{2}c(K) + \frac{3}{2}$</TEX>. Furthermore, Kim, No and Oh found an upper bound on the equilateral stick number <TEX>$ s_{=}(K)$</TEX> as follows; <TEX>$ s_{=}(K) \leq 2c(K) + 2$</TEX>. As a sequel to this research program, we similarly define the stick number <TEX>$ s(G)$</TEX> and the equilateral stick number <TEX>$ s_{=}(G)$</TEX> of a spatial graph <TEX>$ G$</TEX>, and present their upper bounds as follows; $ s\left(G\right) \leq \frac{3}{2}c\left(G\right) + 2e + \frac{3b}{2} -\frac{v}{2},$$ s_{=}\left(G\right) \leq 2c\left(G\right) + 2e + 2b - k,$ where <TEX>$ e$</TEX> and <TEX>$ v$</TEX> are the number of edges and vertices of <TEX>$ G$</TEX>, respectively, <TEX>$ b$</TEX> is the number of bouquet cut-components, and <TEX>$ k$</TEX> is the number of non-splittable components.</P>
Yonghyun, Lee,Minhyuk, Kim,Jisoo, Kim,Nayeon, Choi,Seungsang, Yoon,Seongtaek, Park ASCONS 2021 INTERNATIONAL JOURNAL OF EMERGING MULTIDISCIPLINAR Vol.5 No.4
Background/Objectives: This study was conducted to review and verify the effectiveness of the increase in express trains and train volume, which are currently being introduced step by step, through big data analysis, and to suggest additional new alternatives. Methods/Statistical analysis: Therefore, this study used papers and various statistical data to improve congestion on Seoul Subway Line 9 for service diagnosis and evaluation of the current Seoul Subway Line 9, and derived results through R, an open source. Findings: As a result of the analysis, direct trains connecting Gayang and Dangsan, residential areas, to Yeouido and Sinnonhyeon, business-intensive areas, are operated to minimize commuting congestion. Improvements/Applications: The results of this study are expected to be used as useful guidelines for planning not only subway lines 9 but also other subway lines.
Lattice stick number of spatial graphs
Yoo, Hyungkee,Lee, Chaeryn,Oh, Seungsang World Scientific Publishing Company 2018 Journal of knot theory and its ramifications Vol.27 No.8
<P>The lattice stick number of knots is defined to be the minimal number of straight sticks in the cubic lattice required to construct a lattice stick presentation of the knot. We similarly define the lattice stick number <TEX>$ s_{L}(G)$</TEX> of spatial graphs <TEX>$ G$</TEX> with vertices of degree at most six (necessary for embedding into the cubic lattice), and present an upper bound in terms of the crossing number <TEX>$ c(G)$</TEX>$ s_{L}\left(G\right) \leq 3c\left(G\right) + 6e - 4v - 2s + 3b + k,$ where <TEX>$ G$</TEX> has <TEX>$ e$</TEX> edges, <TEX>$ v$</TEX> vertices, <TEX>$ s$</TEX> cut-components, <TEX>$ b$</TEX> bouquet cut-components, and <TEX>$ k$</TEX> knot components.</P>
김영삼(Youngsam Kim),이승상(Seungsang Lee),송진철(Jinchul Song),임방섭(Bangseop LIM) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
In recent days, Styling of automotive vehicle tends to be sharpened more and more. Specially, for clear and sharp styling of vehicle, The role of character line in vehicle design becomes more important. If character line has sharp edge and small radius, global appearance of vehicle looks like sharp and clear. But small character radius causes a kind of surface defect which is called slip line (kind of skid mark of initial contact line moves). In order to have small and clear character line for outer stamping panel, new stamping process method is required to satisfy vehicle appearance quality. In this study, The Variable Thickness Offset method between upper and lower stamping die has been applied. Usually the clearance between upper and lower stamping die has constant distance of blank thickness except some special case. To avoid and reduce slip line surface defect, the smaller clearance than blank thickness has been applied in the area that the skid line moves. The smaller clearance than blank thickness means giving higher contact pressure to defect area compared to other surface area. As a result, Higher contact pressure makes the slip line defect can be dispersed to adjacent surface. The Variable Thickness Offset method can be considered that it is effective method to improve and reduce slip line surface defect giving by enough contact pressure to blank material. Variable Thickness Offset consists of smaller thickness offset area and transition area.
뒷좌석 승객 충돌안전성 향상을 위한 안전띠 부착장치 최적위치 연구
손완윤(Wanyun Son),윤영한(Younghan Youn),심희섭(Heesub Shim),이승상(Seungsang Lee),박지양(Jiyang Park),김혜선(Hyusun Kim),송영준(Youngjun Song) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
To enhance passengers safety in the event of a car accident, the researches of the vehicle crashworthiness have been constantly conducted. The protection of frontal seat passengers in both driver and front seated occupant has been more focused from the auto industries as well as regulatory bodies more than 40 years. Recently, their interests have been extended to rear seat occupants especially children and female occupants. However, the current available safety devices for the rear seat occupants are seat belt only. According to the previous researchers, the injury level of the rear seat passengers tend to be higher than the injury level of the frontal seat passengers. In this study, the optimal location of seat belts anchorages to enhance rear passengers crashworthiness are studied. FEM models are designed in accordance with regulation of KMVSS 102, ECE R44, ECE R16, and ECE R14. and three point belts are fitted on the HybridIII 5<SUP>th</SUP> percentile dummy and HybridIII 50<SUP>th</SUP> percentile dummy. The combined injury value used HIC15, Nij, Chest deflection, Femur force are used to evaluate the optimal location.