分形图像压缩的进展

扼要综述了几何学新理论分形（Ｆｒａｃｔａｌ）用于静止图像编码与运动图像编码的原理与研究进展。     

测试数据编码压缩技术研究

介绍了测试数据编码压缩技术的原理、特点及技术要求,并根据编码原理对常见的测试编码压缩技术进行分类,研究了每一类编码压缩技术的优势及局限性,最后提出了一种基于纵向分组对比的分块编码思想。这种分块编码思想是将测试集按固定宽度分成若干组,沿纵向对比编码,这种将测试集化整为零的措施有利于提高数据块问的相关性及压缩率,同时为进一步研究测试数据的编码压缩技术提供了新的思路。     

一类和stirling数相关的新数的表示式与应用

本文给出了一类和stirling数相关的新数的生成函数、简明表示式以及在讨论算术等幂级数中的应用.     

Algebraic statistics of level codings for fractional factorial designs

We discuss the applications of algebraic statistics to fractional factorial design with special emphasis on the choice of level coding. In particular, we deal with the theory of Bayley's level codings in that framework.     

An error-free generalized matrix inversion and linear least squares method based on bordering

The paper develops a method from which algorithms can be constructed to numerically compute error-free (free from computer roundoff error) generalized inverses and solutions to linear least squares problems having rational entries. A multiple modulus system is used to avoid error accumulation that is inherent in the floating-point number system. Some properties of finite fields of characteristic p, GF(p), are used in conjunction with a bordering method for matrix inversion to find nonsingular minors of a matrix over the field of rational numbers.     

The manifestations of politics in evaluation: An exploratory study across the evaluation process

Evaluation has been described as a political act. Programs and policies are generated from a political process, and the decision to evaluate and how to use the evaluation are manifestations of the political dynamic. This exploratory study was conducted with practicing evaluators to understand what they view as political situations in the evaluation process and how they responded to these situations. Findings suggest that, in relation to the potential evaluation phases in which each respondent has been involved, evaluations are susceptible to politics when initially attempting to identify stakeholders and when it’s time to report the evaluation findings. Evaluators have also developed multiple strategies for dealing with these situations, including finding allies for the evaluation and working to explain the evaluation process and its implications. We hope that this study will help to inform novice and expert evaluators about the various political situations they may encounter in their practice.     

Indicator function and complex coding for mixed fractional factorial designs

In a general fractional factorial design, the n levels of a factor are coded by the nth roots of the unity. This device allows a full generalization to mixed-level designs of the theory of the polynomial indicator function which has already been introduced for two-level designs in a joint paper with Fontana. The properties of orthogonal arrays and regular fractions are discussed.     

防范边信道攻击的等功耗编码实现算法

介绍了边信道攻击的概念和研究背景,以及幂剩余算法和公钥密码体制抗边信道攻击的主要思路;指出目前公钥密码边信道攻击防范方法的主要问题是以牺牲算法效率为代价。针对目前存在的问题,以消除运算单元之间的功耗差异为目的,提出幂剩余运算的等功耗编码实现算法;通过对新方法的论证,证明等功耗编码实现算法已达到了抗计时和能量攻击的预期目标;通过进一步分析,得到提高算法抗攻击能力不必以牺牲算法效率为代价的结论。     

新的四进制CPM调制方案

针对连续相位调制解调端过于复杂的问题,提出了一种新的网格编码连续相位调制方案。该方案通过在连续相位调制前对信号进行预编码,消除了采用与QPSK类似的方式对CPM信号进行正交解调时所引入的错误倍增对维特比译码性能的影响。接收端先对信号进行正交解调,解调后的结果送入与调制端编码网格相匹配的维特比译码器进行网格译码,恢复出发送的原始数据。仿真结果表明,加入预编码后误比特率为10-5时所需的Eb/N0比不加预编码时减小了1dB。