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    • 6. 发明申请
    • A DIGITAL DATA TRANSFORMING METHOD
    • 一种数字数据转换方法
    • WO0233828A8
    • 2002-08-08
    • PCT/CN0100615
    • 2001-04-26
    • UNIV JIAOTONG SOUTHWESTHE DAKEHE WEI
    • HE DAKEHE WEI
    • G06F17/22H03M7/04H03M7/30H03M7/00
    • H03M7/04G06F17/2217
    • The present invention discloses a digital data transforming method. The method solves the problems of low encoding efficiency and increasing the network load when prepared to transmit enciphered e-mails or any 8-bit data sequence. The key technology is designing a "base-91 encoding" general bit strings to printable ASCII characters which is also referred to base91 encoding or Radix-91 encoding. Combined with Internet standard SMTP, MIME, S/MIME etc., the present invention can reduce 7.7 % of transmitted data or storage demand in place of Base64 encoding; and reduce 58.97 % of transmitted data or storage demand in place of QP encoding which processes the byte data with the high bit being 1. The present invention is applied in enciphering the Internet e-mails and transmitting or storing the compressed data.
    • 本发明公开了一种数字数据变换方法。 该方法解决了编写传输加密电子邮件或任何8位数据序列时编码效率低和增加网络负载的问题。 关键技术是设计一个“base-91编码”通用位串到可打印的ASCII字符,这也被称为base91编码或Radix-91编码。 结合互联网标准SMTP,MIME,S / MIME等,本发明可以减少传输数据或存储需求的7.7%来代替Base64编码; 并且代替处理高位为1的字节数据的QP编码,减少了传输数据或存储需求的58.97%。本发明应用于对互联网电子邮件进行加密并传输或存储压缩数据。
    • 8. 发明申请
    • APPLIED ESTIMATION OF EIGENVECTORS AND EIGENVALUES
    • 应用估计的特征和特征值
    • WO2004111759A3
    • 2007-03-08
    • PCT/US2004016734
    • 2004-05-27
    • PURDUE RESEARCH FOUNDATIONPRABHU NAGABHUSHANAHE WEI
    • PRABHU NAGABHUSHANAHE WEI
    • G06F7/38G06F20060101G06F7/00G06F17/16G06K9/62
    • G06F17/16G06K9/6232
    • Various applications are presented of a vector field method of computing one or more eigenvalues and eigenvectors of a symmetric matrix. The vector field method computes an eigenvector by computing a discrete approximation to the integral curve of a special tangent vector field on the unit sphere. The optimization problems embedded in each iteration of the vector field algorithms admit closed form solutions making the vector field approach relatively efficient. Among the several vector fields discussed is a family of vector fields called the recursive vector fields. Numerical results are presented that suggest that in some embodiments the recursive vector field method yields implementations that are faster than those based on the QR method. Further, the vector field method preserves, and hence can fully exploit the sparseness on the given matrix to speed up computation even further. Preprocessing that contracts the spectral radius of the given matrix further accelerates the systems.
    • 提出了一种用于计算对称矩阵的一个或多个特征值和特征向量的矢量场方法的各种应用。 矢量场方法通过计算单位球上特殊切线矢量场的积分曲线的离散近似来计算特征向量。 嵌入在矢量场算法的每次迭代中的优化问题承认封闭形式的解决方案,使得矢量场方法相对有效。 在讨论的几个矢量场中,有一系列称为递归矢量场的矢量场。 提出了数值结果,表明在一些实施例中,递归矢量场方法产生比基于QR方法的实现更快的实现。 此外,矢量场方法保留,因此可以充分利用给定矩阵上的稀疏,进一步加快计算。 收缩给定矩阵的光谱半径的预处理进一步加速了系统。