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    • 3. 发明授权
    • Fast correctly-rounding floating-point conversion
    • 快速正确的四舍五入浮点转换
    • US07921144B2
    • 2011-04-05
    • US11746693
    • 2007-05-10
    • Michel Henri Theodore Hack
    • Michel Henri Theodore Hack
    • G06F5/00
    • H03M7/24G06F7/49947
    • A system and method for converting bases of floating point numbers using fixed-point computation includes tables having different related spacings of exponent indices. The tables are adapted to cross-reference conversion ratios between exponent bases. The tables are characterized by bi-uniform spacings of source and target exponents and including near-unity table entries representing the conversion ratios. A source number is converted into a target number in a different radix by a sequence of reduction operations using a sequence of the tables. The reduction operations include reducing a source number exponent magnitude and accumulating a target exponent and multiplying a source number mantissa by a selected conversion ratio including a near-unity ratio of powers. A final mantissa is normalized and rounded to produce the target number in a new radix.
    • 使用定点计算来转换浮点数的基数的系统和方法包括具有指数指数不同相关间隔的表。 这些表适用于指数基数之间的交叉参考转换比。 这些表的特征在于源和目标指数的双均匀间隔,并且包括表示转换比率的近单位表条目。 通过使用表的顺序的减少操作的顺序将源号码转换成不同基数的目标号码。 缩小操作包括减少源数指数幅度并累加目标指数,并将源数尾数乘以包括功率的近似一致比的所选择的转换比。 最后的尾数被归一化并四舍五入以产生新的基数中的目标数。
    • 5. 发明授权
    • Adaptive profiling by progressive refinement
    • 通过逐步细化进行适应性分析
    • US08166461B2
    • 2012-04-24
    • US12132008
    • 2008-06-03
    • Michel Henri Theodore Hack
    • Michel Henri Theodore Hack
    • G06F9/44
    • G06F11/3471G06F2201/81G06F2201/88
    • A system/method for profiling a sequence of values from a range to determine a frequency of occurrence of a subrange includes, for a current block, determining whether cells of the current block include a count cell or a pointer cell. If the cell includes a pointer cell, follow an address that the pointer makes reference to and designate a new block as the current block and repeat the determining step for the new block. If the cell includes a count cell, increment the count cell and compare the incremented count cell to a threshold. If the count exceeds the threshold, convert the count cell to a pointer cell, which points to a newly allocated block. The newly allocated block is made the current block, and the steps are repeated until count cells do not exceed the threshold or a limit resolution is achieved.
    • 用于对从范围中的值序列进行分析以确定子范围的出现频率的系统/方法包括:对于当前块,确定当前块的单元是否包括计数单元或指针单元。 如果单元包含指针单元,请遵循指针引用的地址,并将新块指定为当前块,并重复新块的确定步骤。 如果单元包含一个计数单元,则增加计数单元并将增加的计数单元与阈值进行比较。 如果计数超过阈值,则将计数单元转换为指向新单元的指针单元。 新分配的块成为当前块,重复这些步骤,直到计数单元不超过阈值或达到极限分辨率。
    • 6. 发明授权
    • Method for calculating clock offset and skew
    • 计算时钟偏移和偏移的方法
    • US07475272B2
    • 2009-01-06
    • US11223577
    • 2005-09-09
    • Scott M. CarlsonMichel Henri Theodore HackLi Zhang
    • Scott M. CarlsonMichel Henri Theodore HackLi Zhang
    • G06F1/04
    • G06F1/10
    • Disclosed is a method for calculating clock offset and skew between two clocks in a computer system. The method comprises the steps of sending data packets from a first processing unit in the computer system to a second processing unit in the computer system, and sending the data packets from the second processing unit to the first processing unit. First, second, third and fourth time stamps are provided to indicate, respectively, when the packets leave the first processing unit, arrive at the second processing unit, leave the second processing unit, and arrive at the first processing unit. The method comprises the further steps of defining a set of backward delay points using the fourth time stamps, and calculating a clock offset between clocks on the first and second processing units and clock skews of said clocks using said set of backward delay points.
    • 公开了一种用于计算计算机系统中的两个时钟之间的时钟偏移和偏差的方法。 该方法包括以下步骤:将数据分组从计算机系统中的第一处理单元发送到计算机系统中的第二处理单元,并将数据分组从第二处理单元发送到第一处理单元。 提供第一,第二,第三和第四时间戳以分别指示分组离开第一处理单元时到达第二处理单元,离开第二处理单元并到达第一处理单元。 该方法还包括使用第四时间戳定义一组后向延迟点的步骤,以及使用所述一组后向延迟点来计算第一和第二处理单元上的时钟之间的时钟偏移和所述时钟的时钟偏差。
    • 8. 发明授权
    • Method and system for clock skew and offset estimation
    • 时钟偏移和偏移估计的方法和系统
    • US07688865B2
    • 2010-03-30
    • US11223876
    • 2005-09-09
    • Scott M. CarlsonMichel Henri Theodore HackLi Zhang
    • Scott M. CarlsonMichel Henri Theodore HackLi Zhang
    • H04J3/06G06F1/12G06F1/04
    • H04J3/0667
    • Disclosed are a method and system for estimating the skew and offset between two clocks in a computer system. The method comprises the steps of obtaining a first set of data values representing a forward delay between the first and second clocks, and obtaining a second set of data values representing a negative backward delay between the first and second clocks. The method comprises the further steps of forming a lower convex hull for said first set of data values, and forming an upper convex hull, above the lower convex hull, for said second set of data values. The clock offset and the skew between said first and second clocks are estimated using those convex hulls. In a preferred embodiment, this estimation is made by identifying a best clock line between the first and second convex hulls.
    • 公开了一种用于估计计算机系统中两个时钟之间的偏斜和偏移的方法和系统。 该方法包括以下步骤:获得表示第一和第二时钟之间的正向延迟的第一组数据值,并获得表示第一和第二时钟之间的负向后延迟的第二组数据值。 该方法包括以下步骤:为所述第一组数据值形成下凸包,以及形成用于所述第二组数据值的所述下凸包上方的上凸包。 使用这些凸包估计所述第一和第二时钟之间的时钟偏移和偏差。 在优选实施例中,通过识别第一和第二凸包之间的最佳时钟线来进行该估计。