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A study on the effect of the condition number in the magnetic field mapping of the Air-Core solenoid
Li Huang,이상진 한국초전도.저온공학회 2015 한국초전도저온공학회논문지 Vol.17 No.2
Mapping is a useful tool in the magnetic field analysis and design. In some specific research area, such as the nuclear magneticresonance (NMR) or the magnetic resonance imaging (MRI), it is important to map the magnetic field in the interesting space withhigh accuracy. In this paper, an indirect mapping method in the center volume of an air-core solenoid is presented, based on thesolution of the Laplace’s equation for the field. Through the mathematical analysis on the mapping calculation, we know that thecondition number of the matrix, generated by the measurement points, can greatly affect the error of mapping result. Two differentarrangement methods of the measurement points in field mapping are described in this paper: helical cylindrical line (HCL) methodand parallel cylindrical line (PCL) method. According to the condition number, the HCL method is recommended to measure thefield components using one probe. As a simple example, we mapped the magnetic fields in a MRI main magnet system. Comparingthe results in the different methods, it is feasible and convenient to apply the condition number to reduce the error in the fieldmapping calculation. Finally, some guidelines were presented for the magnetic field mapping in the center volume of the air-coresolenoid.
Li Huang,Yan Zhou,Xiangquan Guo,Zuliang Chen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this paper, the sorption of 2,4-DCP onto DK4 (modified with dioctadecyldimethylammoniumchloride(DDAC)) was 3–5 times more than when using Na-bentonite, while sorption of Pb(II) on DK4 was notdifferent from using Na-bentonite. Sorption isotherms for 2,4-DCP and Pb(II) were well described by theLangmuir isotherm (R2 > 0.99), while pseudo-second-order kinetic model provided good kinetic datafitting (R2 > 0.99). Furthermore, DK4 was characterized by SEM–EDS, XRD and FTIR, it is concluded thatthe co-sorption of 2,4-DCP and Pb(II) onto DK4 occurred through the partition mechanism for adsorbing2,4-DCP and the ion-exchange mechanism for the sorption of Pb(II).
An Improved Adaptive Differential Evolution based on Hybrid Method for Function Optimization
Li Huang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.3
In order to improve the optimum speed, crease the diversity of the population and overcome the premature convergence problem in differential evolution(DE) algorithm for solving the complex optimization problems, the chaotic optimization algorithm with powerful local searching capacity and multi- strategy are introduced into the DE algorithm in order to propose an improved adaptive differential evolution(COMSIADE) algorithm in solving function optimization problems. In the COMSIADE algorithm, the ergodicity, regularity and internal randomness of the chaotic sequence are used to overcome the shortcoming of premature local optimum to improve the global searching capacity of the DE algorithm. The multi-population with parallel evolution is used to preserve the diversity of the population at the initial generation. The self-adaptive crossover operator probability is used to improve the global convergence ability, the stability and robustness. Finally, in order to test and verify the effectiveness of the COMSIADE algorithm, several benchmark functions are selected in this paper. The experimental results indicate that the proposed COMSIADE algorithm can improve the global searching capacity and avoid falling into local optimum. And it takes on the higher searching precision and faster convergence speed in solving the complex optimization problem.