ss_pan的博客

The title reminds me of this historical oddity: In the distant past, Chinese scholars, some of them imaginary, traveled to the West (that is, India) in search of Urtcxt Buddhist scriptures. About fifteen centuries later, this process has come full circle, and Western scholars, some of them all too real, trawl to the East to discover and render into Western terms not so much the scriptures as the spirit and gestures of Eastern philosophy. This readable and accurate book, by a pioneering scholar of Buddhism, is a very creditable product of this movement. Even its tone of intellectual severity and moral earnestncssone is reminded at times more of Samuel Richardson than of Chuang Tsu--is entirely appropriate, for Zen Buddhism is the extreme puritanical branch of Eastern my

This book provides a comprehensive, up-to-date description of the methodologies and the application areas, throughout the range of digital communication, in which individual signals and sets of signals with favorable correlation properties play a central role. The necessary mathematical background is presented to explain how these signals are generated, and to show how they satisfy the appropriate correlation constraints. All the known methods to obtain balanced binary sequences with two-valued autocorrelation, many of them only recently discovered, are presented in depth. The authors treat important application areas including: Code Division Multiple Access (CDMA) signals, such as those already in widespread use for cell-phone communication, and planned for universal adoption in the various approaches to 'third-generation'(3G) cell-phone use; systems for coded radar and sonar signals; communication signals to minimize mutual interference ('cross-talk') in multi-user environments; and pseudo-random sequence generation for secure authentication and for stream cipher cryptology.

Error-Correcting Codes, by Professor Peterson, was originally published in 1961. Now, with E. J. Weldon, Jr., as his coauthor, Professor Peterson has extensively rewritten his material. The book contains essentially all of the material of the first edition; however, the authors state that because there has been so much new work published in error-correcting codes, the preparation of this second edition proved to be a much greater task than writing the original book. The major additions are the chapters on majority-logic codes, synchronization, and convolutional codes. Much new material has also been added to the chapters on important linear block codes and cyclic codes. The authors cite some highly regarded books on recent work done in Eastern Europe and an extensive bibliography on coding theory in the Soviet Union [sic]. In its much-expanded form, Error-Correcting Codes may be considered another valuable contribution to computer coding.

针对传统保序加密方法安全性和效率不能兼顾的缺点，提出一种基于非线性映射的保序加 密方案．该保序加密算法使用非线性映射和非线性分割的方法来隐藏数据分布和数据频率．介绍了 云环境下保序加密的系统模型（含问题模型和敌手模型）；对于问题模型提出了保序加密方案并且 验证其正确性；进一步分析该方案在敌手模型２种攻击下的安全性，并与其他保序加密方案做对 比．结果表明，所提出的保序加密方案可达到抗统计攻击和ＩＮＤ-ＤＮＣＰＡ安全，有着良好的安全性； 每十万个加密数平均加密执行时间大约３０ｍｓ，有着较高的效率；该方案可以用任何可编程语言部署和实现，有着良好的可编程性。