To resist quadratic approach, the quadratic bent functions, 2 nd order Walsh spectrum and quadratic nonlinearty are presented.
在密码学中 ,为抵抗二次逼近引入了二次bent函数、二阶Walsh谱与二次非线性度的概念 ,并得到了n元布尔函数的二次非线性度的最大值为 2 n -1-2 n/ 2 -1。
Theoretical models and positive researches indicate that there exists a nonlinear relationship between corruption and FDI,and corruption do not definitely prevent FDI except in certain stage.
理论模型和实证研究表明,腐败和FDI之间存在二次非线性关系,腐败并不一定会阻止FDI的流入,仅仅在某一阶段会产生这种关系;而在另一阶段,腐败和FD I之间确实存在着负相关的关系。
Study on Secondary Seismic Acquisition in Southern Steep Zone in Biyang Depression;
泌阳凹陷南部陡坡带二次采集方法研究