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CLASSIFICATIONS OF METRIC FUNCTIONS ON THE PLANE
KIM, SEHUN,KIM, BYUNGJIN,KIM, JUNGON,KIM, HARAM,KIM, BYUNG HAK The Korean Society for Computational and Applied M 2018 Journal of applied mathematics & informatics Vol.36 No.1
There are many metric functions in the plane. In this paper we are to classify the metric functions on the plane using two ways such as using sum of distances between some points when start point and end point is fixed, and using area of transferred triangle consisted of distances between 3 points.
KIM, SEHUN,KIM, BYUNGJIN,KIM, JUNGON,KIM, HARAM,KIM, BYUNG HAK The Korean Society for Computational and Applied M 2018 Journal of applied mathematics & informatics Vol.36 No.1
The Euclid metric is well-known and there are many results on the space with that metric. But there are many other metrics which gives more practical and useful results in the plane. In this paper, we introduce new metric function in the plane, which is more useful in city with subway. Finally we generalize to the general metric space and introduce a new metric on ${\mathbb{R}}^n$.
ABS 장착 차량의 제동 거리 해석을 이용한 파라미터 연구
김세훈(Sehun Kim),김종찬(Jongchan Kim),김기호(Kiho Kim),권성진(Seong-Jin Kwon),배철용(Chul-Yong Bae),이봉현(Bong-Huyn Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Braking distance is a very important factor of the items to evaluate the safety of vehicles. Braking performance of the vehicle is affected by brake systems, tires and road friction characteristic. In this paper, we studied on the tire parameters related with the brake distance of vehicle equipped with ABS system. To achieve this, we developed the braking distance simulation method through multi-body vehicle dynamic model containing brake control logic and tire model, and it"s confidence was verified by outdoor braking test. Also, we analyzed relationship between tire’s characteristic and braking distance by orthogonal arrays based on the DOE(Design of Experiments).
Lee, Hyunsoo,Son, Narae,Jeong, Hu Young,Kim, Tae Gun,Bang, Gyeong Sook,Kim, Jong Yun,Shim, Gi Woong,Goddeti, Kalyan C.,Kim, Jong Hun,Kim, Namdong,Shin, Hyun-Joon,Kim, Wondong,Kim, Sehun,Choi, Sung-Yoo The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.7
<P>We investigated the subdomain structures of single-layer graphene oxide (GO) by characterizing local friction and conductance using conductive atomic force microscopy. Friction and conductance mapping showed that a single-layer GO flake has subdomains several tens to a few hundreds of nanometers in lateral size. The GO subdomains exhibited low friction (high conductance) in the sp(2)-rich phase and high friction (low conductance) in the sp(3)-rich phase. Current-voltage spectroscopy revealed that the local current flow in single-layer GO depends on the quantity of hydroxyl and carboxyl groups, and epoxy bridges within the 2-dimensional carbon layer. The presence of subdomains with different sp(2)/sp(3) carbon ratios on a GO flake was also confirmed by chemical mapping using scanning transmission X-ray microscopy. These results suggest that spatial mapping of the friction and conductance can be used to rapidly identify the composition of heterogeneous single-layer GO at nanometer scale, which is essential for understanding charge transport in nanoelectronic devices.</P>
An efficient algorithm for generalized SS/TDMA scheduling with satellite cluster
Kim, Sehun,Kim, Soo-Hyun 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.1
We consider the satellite cluster scheduling problem which is one of the most interesting problems in satellite communication scheduling area. This problem is known to be NP-complete and a couple of heuristic algorithms had been developed. In this paper, we suggest another algorithm for this problem which has the same computational complexity as the best existing one and provides much better solution quality. Extensive computational simulation results are reported.