TSM系统中随机接入成功率的分析

TSM是从GSM到TD-SCDMA系统的一个过渡标准，在TD—SCDMA的开发过程中，各大开发商在TSM上花费了很多功夫。对于任何一个移动通信系统，都需要随机过程，随机接入能力将直接影响到一个系统的性能，所以很有必要对TSM系统的随机接入过程进行认真的分析与研究。本文将介绍TSM系统中的随机接入过程及其接入能力。最后对结论做简单的仿真和分析。     

基于二值运算的隐形签名数字水印算法

提出了一种基于二值运算的在数字图像上实现隐形签名的数字水印算法。使用该算法嵌入的隐形签名具有很好的隐蔽性，感觉不到对原始图像的影响。同时，嵌入的隐形签名具有很理想的鲁棒性，能免疫于常规图像处理方法的有限攻击。而且，隐形签名的检测不需要原始图像。     

一种单向密钥分发体制的设计

网络上信息的安全传输是一个重要的问题。本文设计了一种单向密钥分发体制,即密钥的生成和密文的传输是在通信的一次交互活动中同时完成,另外信息加密前将其与一随机数共同压缩。本文还给出了该体制的具体实现,并指出了其优点以及分析了安全性。     

New Multisignature Scheme Based on Bilinear Pairings

Two digital multisignature schemes based on bilinear pairings were proposed. One of them is the sequential digital multisignature, and the other is the broadcasting digital multisignature. The scheme has the same security as JI and LI＇s multisignature scheme, but the new scheme has the lower computation. So the new scheme is the multisignature which has high security and low computation. It has the theory meaning and extensive application under the condition of SmartCard, etc.     

High-spin states and signature inversion in odd-odd 182Au

High-spin states in 182Au have been produced and studied via the 152Sm(35Cl,5nγ)182Au reaction. The level scheme consisting of the πh9/2(*)Vi13/2 and πi13/2(*)V i13/2 bands has been established for the first time. The low spin signature inversion in both bands has been found. The observed signature inversion phenomena can be interpreted qualitatively using the pairing and deformation self-consistent cranked Wood-Saxon calculations.     

Computation of Signature Symmetric Balanced Realizations

A new numerical scheme for computing balancing coordinate transformations for signature symmetric realizations in linear systems theory is presented. The method is closely related to the Jacobi method for diagonalizing symmetric matrices. Here the minimization of the sum of traces of the Gramians by orthogonal and hyperbolic Jacobi-type rotations is considered. Local quadratic convergence of the algorithm is shown.     

浅谈Microsoft Office 2000中宏数字签名技术

讨论了数字签名与宏之间的关系，给出了数字签名以及宏项目(macro project)的定义并及介绍了Office 2000数字签名机制提供的保护。     

数字签名在电子商务和信用调查方面的安全性

随着电子商务和信用调查领域的不断普及,数字签名在企业、银行、电子商务网站和信用调查机构之间的网络安全性越发重要。本文论述了数字签名加密技术在算法上的一些易受攻击的细节和防范措施,以及安全认证协议在使用环境中受到的威胁和策略性解决方案。     

一种新的并行多消息签名方案

在现有的数字签名方案中,一个人可以对一个文件签名,也可以同时对多个文件签名。如果需要多个人对多个文件签名,往往采用顺序签名或者需要一个第三者代理多个人签名。有时需要多个签名人在没有代理人的情况下对多个消息并行(同时)签名,现有的签名方案都满足不了这样的需要。本文给出一种能够满足这种需要的并行多消息签名方案,并给出了安全性证明,签名的验证也是并行的。     

Observation of signature inversion in the πh_(9/2)νi_(13/2) oblate band

The low-spin signature inversion phenomenon has been systematically observed in deformed odd-odd nuclei throughout the chart of nuclides in the πg 9 /2 νg9/2, π h1 1/2  νh11/2, πh 1 1 /2 νi13/2, πh 9 /2 νi13/2 and πi 1 3 /2 νi13/2 configurations (see refs. [1,2] and the references therein). Such anomalous phenomenon has become the subject of extensive experimental and theoretical studies[3]. In order to investigate the physical origins of signature inversion, it is very imp…