Enhancement of Information Transmission by Array Induced Stochastic Resonance in the Processes of Amplitude and Frequency Modulations

Information transmission is studied in the cases of amplitude and frequency modulations where there is an impulsive jamming in the signal. By using the array approach of nonlinear elements, we find that for both the periodic and aperiodic modulations, the information transmission can be enhanced by adding independent external noise on every element of the array. The dependence of information transmission on the size of array and the impulsive interval of the jamming are also studied.     

Image Encryption Based on First-order Hyperbolic Equation and MD5 Function

Partial differential equations are playing an important role in modern science. The applica-tions in information security have received much attention in the past 20 years. In [1], Blakley and Rundell designed a new ciphering structure based on the parabolic equation and its time-back problem, which named as 'heat flow cryptosystems'. This skill was developed to deal with some more sophisticated cases, see[2].     

基于WEB的空间天气信息系统构架初步设计

研究了WWW和基于Web的信息系统的基本特性和相关技术 ,给出基于Web的空间天气信息系统框架的初步设计。     

电离层TEC与地方时相关性的数值分析

针对观测量比较少的地区的特殊情形,用数值分析的方法研究了电离层TEC与地方时相关性,使用模拟数据进行了分析比较,结果表明:在同一纬度附近,若某经度范围的地区观测站点非常稀疏或几乎没有的情况下,可以充分利用其它经度范围最近时段的同一地方时刻的TEC作为重要的参考数据来进行本经度区域修正。