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이정한(Junghan Yi),이대행(Daehang Lee),김민철(Mincheol Kim),이순칠(Soonchil Lee),홍계원(Gyewon Hong),이호준(Hojoon Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
A precise magnetic field probe was designed to measure the field distribution inside a superconducting magnet. The operation principle of the developed equipment is based on cw-NMR. The range of field is from 2.8 T to 5.8 T, and the resolution is better than 0.3 ppm NMR samples were water and heavy water contained in a tube of 4 ㎜ diameter and 4㎜ height. This equipment can be manufactured very inexpensively compared with the currently available commertial ones.
조두호(Duho Cho),이정한(Junghan Lee),이기창(Kichang Yi),유완석(Wansuk Yoo) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.12
In multibody dynamic analysis, one of the most important problems is to reduce computation times for real-time simulation. This paper presents the derivation procedure of equations of motion of a 6x6 autonomous vehicle in terms of chassis local coordinates which do not require coordinates transformation matrix to enhance efficiency for real-time dynamic analysis. Also, equations of motion are derived using the VT(velocity transformation) technique and symbolic computation method coded by MATLAB. The Jacobian matrix of the equations of motion of a system is derived from symbolic operations to apply the implicit integration method. The analysis results were compared with ADAMS results to verify the accuracy and approve the feasibility of real time analysis.