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71. 发明申请

US20070038913A1 Method and apparatus for the reliability of host data stored on fibre channel attached storage subsystems 失效
标题翻译：存储在光纤通道连接存储子系统上的主机数据的可靠性的方法和装置
公开(公告)号：US20070038913A1
公开(公告)日：2007-02-15
申请号：US11189895
申请日：2005-07-26
申请人： James Allen , Thomas Mathews , Ravi Shankar , Satya Sharma , Glenn Wightwick
发明人： James Allen , Thomas Mathews , Ravi Shankar , Satya Sharma , Glenn Wightwick
IPC分类号： H03M13/00
CPC分类号： G11B20/1813
摘要： A method for improving the reliability of host data stored on Fibre Channel attached storage subsystems by performing end-to-end data integrity checks. When a read or write operation is initiated, an initial checksum for data in the read/write operation is generated and associated with the data, wherein the association exists through a plurality of layers of software and attached storage subsystems. The initial checksum is passed with the data in the read/write path. When a layer of software in the read/write path receives the initial checksum and data, the layer performs an integrity check of the data, which includes generating another checksum and comparing it to the initial checksum. If the checksums do not match, the read/write operation fails and the error is logged. If the checksums match, the integrity check is repeated through each layer in the read/write path to enable detecting data corruption at the point of source.
摘要翻译：通过执行端到端数据完整性检查来提高存储在光纤通道附加存储子系统上的主机数据的可靠性的方法。当启动读或写操作时，生成读/写操作中的数据的初始校验和并与数据相关联，其中通过多层软件和附加的存储子系统存在关联。初始校验和与读/写路径中的数据一起传递。当读/写路径中的软件层接收到初始校验和和数据时，层执行数据的完整性检查，其中包括生成另一个校验和并将其与初始校验和进行比较。如果校验和不匹配，则读/写操作失败，并记录错误。如果校验和匹配，则通过读/写路径中的每个层重复完整性检查，以便能够在源点检测数据损坏。

72. 发明授权

US06678710B1 Logarithmic number system for performing calculations in a processor 有权
标题翻译：用于在处理器中执行计算的对数编号系统
公开(公告)号：US06678710B1
公开(公告)日：2004-01-13
申请号：US09706467
申请日：2000-11-03
申请人： Ravi Shankar , Subramania I. Sudharsanan
发明人： Ravi Shankar , Subramania I. Sudharsanan
IPC分类号： G06F700
CPC分类号： G06F7/4833
摘要： A computation unit employs a logarithmic number system that uses a logarithmic numerical representation that differs from an IEEE standard representation to improve the efficiency of computation, both by reducing the time expended in performing the computation and by reducing the size of the integrated circuit that performs the computation. The illustrative computation unit employs a numerical representation that is similar to the IEEE format except that the sign term is omitted. Thus only positive numbers are represented. The value of the mantissa is defined as a fractional number between zero and one. The logarithmic number system is a useful number system domain for multiplication, division, reciprocal, square root, and power computations using multiplication, division, and square root computation techniques described by following equations: A*B=Anti-log(log(A)+log(B)), (3) A/B=Anti-log(log(A)−log(B)), (4) B½=Anti-log(log(B)/2). (5)
摘要翻译：计算单元使用对数数字系统，其使用与IEEE标准表示不同的对数数字表示，以通过减少执行计算所花费的时间和减少执行计算的集成电路的大小来提高计算效率计算。说明性计算单元采用类似于IEEE格式的数字表示，除了省略符号项。因此，仅表示正数。尾数的值被定义为零和一之间的分数。对数次数系统是使用以下等式描述的乘法，除法和平方根计算技术的乘法，除法，倒数，平方根和功率计算的有用数字系统域：

73. 发明授权

US06537021B2 Abradeable seal system 有权
公开(公告)号：US06537021B2
公开(公告)日：2003-03-25
申请号：US09875764
申请日：2001-06-06
申请人： Peter Howard , Ravi Shankar , Richard Fenton
发明人： Peter Howard , Ravi Shankar , Richard Fenton
IPC分类号： F01D1108
CPC分类号： F01D11/122 , C23C28/022 , C23C28/027 , C23C28/028 , F05C2203/0839 , Y10T428/12819
摘要： A gas turbine engine abradeable seal system is provided comprising a seal assembly and a cooperating interacting turbine blade. The turbine blade has a tip portion containing cubic boron nitride abrasive particles and the seal assembly has a superalloy substrate with a bond coat thereon having a surface roughness of at least 300 RA and a porous ceramic abradeable seal material on the bond coat having a porosity of from 5 to 15 volume %.

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