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    • 2. 发明申请
    • METHOD AND SYSTEM FOR REDUCING CONTEXTS FOR CONTEXT BASED COMPRESSION SYSTEMS
    • 用于减少基于上下文压缩系统的参数的方法和系统
    • US20120044097A1
    • 2012-02-23
    • US13285647
    • 2011-10-31
    • Steven CHANEn-Hui YANG
    • Steven CHANEn-Hui YANG
    • H03M7/30
    • H03M7/30H03M7/3084
    • For context based compression techniques, for example Context Based YK compression, a method and system for grouping contexts from a given context model together to create a new context model that has fewer contexts, but retains acceptable compression gains compared to the original context model. According to an exemplary embodiment of the method empirical statistics are determined for a file type of a file to be compressed; and the context model is generated by iteratively grouping contexts of an initial context model in accordance with the empirical statistics, the context model having fewer contexts than an initial context model.
    • 对于基于上下文的压缩技术,例如基于上下文的YK压缩,一种用于将来自给定上下文模型的上下文分组到一起的方法和系统,以创建具有较少上下文的新上下文模型,但与原始上下文模型相比,保留可接受的压缩增益。 根据方法的示例性实施例,为要压缩的文件的文件类型确定经验统计; 并且通过根据经验统计量反复地分组初始上下文模型的上下文来产生上下文模型,上下文模型具有比初始上下文模型更少的上下文。
    • 4. 发明申请
    • METHOD AND SYSTEM FOR REDUCING CONTEXTS FOR CONTEXT BASED COMPRESSION SYSTEMS
    • 用于减少基于上下文压缩系统的参数的方法和系统
    • US20100013677A1
    • 2010-01-21
    • US12566815
    • 2009-09-25
    • Steven CHANEn-Hui YANG
    • Steven CHANEn-Hui YANG
    • H03M7/34
    • H03M7/30H03M7/3084
    • For context based compression techniques, for example Context Based YK compression, a method and system for grouping contexts from a given context model together to create a new context model that has fewer contexts, but retains acceptable compression gains compared to the context model with more contexts is provided. According to an exemplary embodiment a set of files that are correlated to the file to be compressed (hereafter called training files) are read to determine, for an initial context model, the empirical statistics of contexts and symbols. In some embodiments, this includes determining the estimated joint and conditional probabilities of the various contexts and symbols (or blocks of symbols). The initial context model is then reduced to a desired number of contexts, for example, by applying a grouping function g to the original set of contexts to obtain a new and smaller set of contexts. In some embodiments the step of applying a grouping function comprises iteratively grouping a pair of contexts together to form a grouped context, wherein each grouped context represents a local minimum based on the empirical statistics.
    • 对于基于上下文的压缩技术,例如基于上下文的YK压缩,一种用于将来自给定上下文模型的上下文一起分组的方法和系统,以创建具有较少上下文的新上下文模型,但与具有更多上下文的上下文模型相比,保留可接受的压缩增益 被提供。 根据示例性实施例,读取与要压缩的文件(以下称为训练文件)相关联的一组文件,以便为初始上下文模型确定上下文和符号的经验统计。 在一些实施例中,这包括确定各种上下文和符号(或符号块)的估计的联合和条件概率。 然后,将初始上下文模型简化为期望数量的上下文,例如通过将分组函数g应用于原始上下文集合来获得新的和较小的上下文集合。 在一些实施例中,应用分组功能的步骤包括将一对上下文迭代地分组在一起以形成分组的上下文,其中每个分组的上下文表示基于经验统计的局部最小值。
    • 9. 发明申请
    • Method and Apparatus for Using an Electromagnetically Shielded Enclosure for Exchanging Secure Data
    • 使用电磁屏​​蔽外壳交换安全数据的方法和装置
    • US20080096494A1
    • 2008-04-24
    • US11875803
    • 2007-10-19
    • Steven CHANGeorge HUANG
    • Steven CHANGeorge HUANG
    • H04B1/38
    • H04M1/7253
    • A method and apparatus to use a shielded enclosure for exchanging secure data. One embodiment comprises an enclosure formed of electromagnetically shielding material that prevents an electromagnetic field from entering an interior of the enclosure or emitting from the interior of the enclosure, the enclosure sized to house a mobile electronic device; a receiver within an interior of the enclosure to receive data transferred wirelessly from a mobile electronic device placed within the enclosure; and a hardware interface having a first end external to the enclosure and a second end within the interior of the enclosure and coupled to the antenna, the hardware interface to transfer data wirelessly received by the receiver to a separate device exterior to the enclosure.
    • 一种使用屏蔽外壳交换安全数据的方法和装置。 一个实施例包括由电磁屏蔽材料形成的外壳,其防止电磁场进入外壳的内部或从外壳的内部发射,外壳尺寸设计成容纳移动电子设备; 在所述外壳的内部中的接收器,用于接收从放置在所述外壳内的移动电子设备无线地传送的数据; 以及硬件接口,其具有壳体外部的第一端和壳体内部的第二端并耦合到天线,硬件接口将由接收器无线接收的数据传送到外壳外部的单独设备。