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Vittorio Castelli, Chung Sheng Li, Alexander Thomasian: Multidimensional data clustering and dimension reduction for indexing and searching. International Business Machines Corporation, Kevin M F Chau & Associates Jordan, September 19, 2000: US06122628 (301 worldwide citation)

An improved multidimensional data indexing technique that generates compact indexes such that most or all of the index can reside in main memory at any time. During the clustering and dimensionality reduction, clustering information and dimensionality reduction information are generated for use in a ...


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Vittorio Castelli, Chung Sheng Li, Alexander Thomasian: Searching multidimensional indexes using associated clustering and dimension reduction information. International Business Machines Corporation, Kevin M Jordan, Wayne L Ellenbogen, October 17, 2000: US06134541 (145 worldwide citation)

An improved multidimensional data indexing technique that generates compact indexes such that most or all of the index can reside in main memory at any time. During the clustering and dimensionality reduction, clustering information and dimensionality reduction information are generated for use in a ...


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Peter A Franaszek, John T Robinson, Alexander Thomasian: Raid level 5 with free blocks parity cache. International Business Machines Corporation, Robert P Tassinari Jr, May 28, 1996: US05522032 (37 worldwide citation)

A system for writing data to a disk array includes a cache memory coupled to the disk array for storing data indicative of locations on the disk array and parity blocks associated with parity groups including the locations. Each of the parity blocks includes an identifier indicative of locations wit ...


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Peter A Franaszek, John T Robinson, Alexander Thomasian: Centralized and distributed wait depth limited concurrency control methods and apparatus. International Business Machines Corporation, Whitham & Marhoefer, March 9, 1993: US05193188 (35 worldwide citation)

A wait depth limited concurrency control method for use in a multi-user data processing environment restricts the depth of the waiting tree to a predetermined depth, taking into account the progress made by transactions in conflict resolution. In the preferred embodiment for a centralized transactio ...


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Vittorio Castelli, Chung Sheng Li, Alexander Thomasian: Multidimensional data clustering and dimension reduction for indexing and searching. International Business Machines, yang guoxu, May 19, 1999: CN98123803

Disclosed is an improved multidimensional data indexing technique, and most or all of the index can reside in main memory at any time. During the clustering and dimensionality reduction, clustering information and dimensionality reduction information are generated for use in a subsequent search phas ...


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Peter Anthony Franaszek, John Timothy Robinson, Alexander Thomasian: Raid level 5 with free blocks parity cache. International Business Machines Corporation, FAN BENGUO, March 13, 1996: CN95103824

A system for writing data to a disk array includes a cache memory coupled to the disk array for storing data indicative of locations on the disk array and parity blocks associated with parity groups including the locations. Each of the parity blocks includes an identifier indicative of locations wit ...


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