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    • 2. 发明授权
    • Integrating decision feedback equalization and forward error correction
to improve performance in point-to-multipoint digital transmission
    • 集成判决反馈均衡和前向纠错,以提高点对多点数字传输的性能
    • US6088390A
    • 2000-07-11
    • US898166
    • 1997-07-22
    • Mark RussellVladimir FriedmanStuart D. Sandberg
    • Mark RussellVladimir FriedmanStuart D. Sandberg
    • H04L1/00H04L25/03H03H7/30H03H7/40
    • H04L1/0071H04L25/03146H04L1/0057H04L2001/0093H04L2025/0349H04L2025/0377H04L2025/03796
    • A method and system which combines a properly designed FEC and the periodic transmission of known symbols to obtain a desired error performance in a point-to-multipoint digital transmission system employing a DFE which induces error propagation. A transmitter unit includes a forward error correction encoder (FEC) which implements a code to information provided to an input of a data interleaver having block length N and interleaving depth D, and a data modulator which is coupled to an output of the data interleaver to receive a stream of data symbols. At least one receiver unit includes a decision feedback equalizer (DFE) which includes a feedback filter and provides an input to a data deinterleaver having block length N and interleaving depth D, and a FEC decoder which receives data from an output of the data deinterleaver. Sequences of known symbols of length at least equal to the length of the feedback filter are periodically added to the output of the data interleaver. The receiver unit uses knowledge of the sequence to pass correct data to the feedback filter. The number of data symbols between the periodic sequences is made equal to an integer multiple k of the interleaving Depth D, thus limiting error propagation to cause no more than k errors per codeward of block length N. The FEC code serves to correct the k errors per error propagation event.
    • 一种组合适当设计的FEC和已知符号的周期性传输的方法和系统,以在采用引起误差传播的DFE的点对多点数字传输系统中获得期望的误差性能。 发射机单元包括前向纠错编码器(FEC),其向提供给具有块长度N和交织深度D的数据交织器的输入的信号实现代码,以及数据调制器,其耦合到数据交织器的输出到 接收数据符号流。 至少一个接收器单元包括判决反馈均衡器(DFE),其包括反馈滤波器并向具有块长度N和交织深度D的数据解交织器提供输入,以及从数据解交织器的输出接收数据的FEC解码器。 至少等于反馈滤波器的长度的已知符号长度的序列被周期性地添加到数据交织器的输出。 接收器单元使用序列的知识将正确的数据传送到反馈滤波器。 使周期序列之间的数据符号数等于交织深度D的整数倍k,从而限制误差传播,从而造成块长度N的每个码字不超过k个错误。FEC码用于校正k个误差 每个错误传播事件。
    • 3. 发明申请
    • CUTTING TOOL INSERTS
    • 切割工具插件
    • US20120193152A1
    • 2012-08-02
    • US13500167
    • 2010-09-15
    • Mark RussellAndy Ollerenshaw
    • Mark RussellAndy Ollerenshaw
    • E21B10/36
    • E21B10/56E21B10/567E21B10/5673E21B10/627E21B10/633E21B29/002
    • An insert (10) for a cutting tool (100) for use down a well bore comprises a body of a hard material (tungsten carbide) suitable for cutting steel. The body is shaped for formation in a mould that comprises a die (70) and first (74) and second (78) punches and arranged so that the first punch can eject the body after formation from an opening of the die closed during formation by said second punch. The insert has first (12) and second (14) ends whose faces are defined, at least in part, by corresponding faces of the first and second punch. Between them is a longitudinal axis (24) of the insert. The area of the first end is less than the area of the second end. The body has flanks (16) that form ridges (18) extending between the first and second ends. The ridges form cutting edges of the insert. They are separated by V-shaped troughs (20) of said flanks. The ridges taper and spiral about the axis.
    • 用于井下使用的用于切削工具(100)的刀片(10)包括适于切割钢的硬质材料(碳化钨)的主体。 本体被成形为在模具中形成,该模具包括模具(70)和第一(74)和第二(78)冲头,并且布置成使得第一冲头可以在形成期间从模具的开口在形成期间封闭的主体 第二拳 插入件具有至少部分地由第一和第二冲头的对应面限定其面的第一(12)和第二(14)端。 它们之间是插入件的纵向轴线(24)。 第一端的面积小于第二端的面积。 主体具有形成在第一和第二端之间延伸的脊(18)的侧面(16)。 脊形成插入物的切割边缘。 它们由所述侧面的V形槽(20)分开。 脊部围绕轴线逐渐变细并旋转。
    • 8. 发明授权
    • Intelligent selection of graphic objects keypoints and relationships
    • 图形对象的智能选择关键点和关系
    • US06384841B1
    • 2002-05-07
    • US09353534
    • 1999-07-14
    • Paul LebovitzGary SmithMark RussellEric Mawby
    • Paul LebovitzGary SmithMark RussellEric Mawby
    • G09G500
    • G06F3/04842
    • The present invention provides a computer system with an improved graphically-oriented user interface that permits the user to more easily select for manipulation one object from a number of objects that overlap or are in close proximity to one another at a common location in a graphic display. In a preferred embodiment, the invention presents the computer user with the opportunity to preview all possible objects that the cursor might be identifying at its current position and the ability to select one of those objects for manipulation. Thus, rather than cycling through the entire list of objects available for selection at a location in the display, the user can immediately narrow the list down to the desired selection only. The present invention prevents selection errors and drastically reduces the number of user inputs required to select an object.
    • 本发明提供一种计算机系统,其具有改进的面向图形的用户界面,其允许用户更容易地选择在图形显示器中的公共位置处从彼此重叠或彼此靠近的多个对象中操纵一个对象 。 在优选实施例中,本发明使计算机用户有机会预览光标可能在其当前位置识别的所有可能对象,以及选择那些对象之一进行操纵的能力。 因此,用户可以立即将列表缩小到期望的选择,而不是循环遍历显示器中可用于选择的整个对象列表。 本发明防止选择错误,并且大大减少了选择对象所需的用户输入的数量。