项目团队和谐度的响应模型分析

基于和谐管理理论的研究框架,结合项目管理的特点,将项目团队抽象为项目团队系统,用傅立叶级数部分和表示项目团队的和谐度.这种新方法表示的和谐度波动与项目生命周期中的绩效变化具有良好的对应关系,说明了在项目团队的组建、解散阶段施加管理活动的必要性.基于此提出和谐度响应模型,模拟对项目团队系统施加管理活动后和谐度的变化,使对和谐度的研究由定性分析拓展到定量计算阶段.     

Efficient image encryption scheme with synchronous substitution and diffusion based on double S-boxes

Single or multiple S-boxes are widely used in image encryption schemes, and in many image encryption schemes the asynchronous encryption structure is utilized, which separates the processes of substitution and diffusion. In this paper, we analyze the defects of this structure based on the example of an article and crack it using a simpler method. To address the defects of the asynchronous encryption structure, a novel encryption scheme is proposed, in which the structure of synchronous substitution and diffusion based on double S-boxes is utilized, so the processes of substitution and diffusion are combined together and the attackers cannot crack the cryptosystem by any of the processes. The simulation results and security analysis show that the proposed encryption scheme is safer and more efficient to expediently use in the real-time system.