Two-weight or three-weight binary linear codes from cyclotomic mappings

Recently, linear codes with few weights have been studied extensively. These linear codes have wide applications in secret sharing schemes and authentication codes. In this paper, we introduce a new construction of defining sets using cyclotomic mappings and construct three new classes of binary linear codes with two or three weights. We also explicitly determine the weight distributions of these codes.     

纵场磁体电源变流器均流分析

在纵场磁体电源变流器均流特性分析中，通过对桥臂分段和提取支路分布参数矩阵的方法，建立了大功率变流器桥臂的等效电路模型，计算了各个支路电流和变流器的均流系数。通过变流器的仿真模拟得到了桥臂电流演化，模型的仿真结果与理论计算基本一致，其均流系数均小于1.2的工程设计目标。