Li Zhang

US Patent:

7103514, Sep 5, 2006

Filed:

Sep 9, 2005

Appl. No.:

11/223730

Inventors:

Scott M. Carlson - Tucson AZ, US
Michel Henri Théodore Hack - Cortlandt Manor NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/00

US Classification:

702189, 702123, 702125, 702127, 714707, 714708, 714712, 714821

Abstract:

Disclosed are a method and system for detecting point. The method of this invention comprises the steps of providing a set of points representing measured time delays between two clocks, providing a turning indicator to measure a magnitude of turns per measurement interval, and identifying a turn at a given point when the turn indicator at said given point is above a given value. With the preferred embodiment of the invention, the turn indicator is given by the equation: turn_indicator=(rtt_min−rtt_estimate)/number_of_points; where rtt_min is the minimum round trip delay in all the measurement points, and rtt_estimate is estimated round trip delay by using the symmetric convex hull algorithm.

US Patent:

7475272, Jan 6, 2009

Filed:

Sep 9, 2005

Appl. No.:

11/223577

Inventors:

Scott M. Carlson - Tucson AZ, US
Michel Henri Theodore Hack - Cortlandt Manor NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/04

US Classification:

713503, 713500, 370503, 707100

Abstract:

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.

US Patent:

7688865, Mar 30, 2010

Filed:

Sep 9, 2005

Appl. No.:

11/223876

Inventors:

Scott M. Carlson - Tucson AZ, US
Michel Henri Theodore Hack - Cortland Manor NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04J 3/06
G06F 1/12
G06F 1/04

US Classification:

370516, 370518, 370519, 713400, 713503

Abstract:

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.

US Patent:

7822072, Oct 26, 2010

Filed:

Sep 9, 2005

Appl. No.:

11/223878

Inventors:

Scott M. Carlson - Tucson AZ, US
Michel Henri Théodore Hack - Cortlandt Manor NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04J 3/06
G06F 1/12
G06F 1/04

US Classification:

370516, 370518, 370519, 713400, 713503

Abstract:

Disclosed are a method and system to estimate the maximum error in the clock offset and skew estimation 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 step of forming a lower convex hull for said first set of data values, and forming an upper convex hull for said second set of data values. First and second parallel lines are formed between the upper and lower convex hulls, and these parallel lines are used to estimate the worst case error for the offset, skew rate and dispersion of said first and second clocks.

US Patent:

7865760, Jan 4, 2011

Filed:

Oct 3, 2008

Appl. No.:

12/245303

Inventors:

Scott M. Carlson - Tucson AZ, US
Michel H. T. Hack - Cortlandt Manor NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/04
G06F 11/00
H04J 3/06

US Classification:

713503, 713500, 370503, 707100

Abstract:

Disclosed are a method and system 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.

US Patent:

8366787, Feb 5, 2013

Filed:

Jun 14, 2002

Appl. No.:

10/172347

Inventors:

Laura Jean Brown - Hamilton Square NJ, US
Iksoo Chun - Flemington NJ, US
Sridevi Dhanaraj - Raritan NJ, US
Prasanna Malaviya - Ft. Wayne IN, US
Mora C. Melican - Bridgwater NJ, US
Alireza Rezania - Hillsborough NJ, US
Li Zhang - Lawrenceville NJ, US

Assignee:

DePuy Products, Inc. - Warsaw IN

International Classification:

A61F 2/02

US Classification:

623 2372

Abstract:

A bioprosthetic device is provided for soft tissue attachment, reinforcement, and or reconstruction. The device comprises a naturally occurring extracellular matrix portion and a three-dimensional synthetic portion. In illustrated embodiments, the naturally occurring extracellular matrix portion comprises layers of small intestine submucosa, and the three-dimensional synthetic portion comprises a foam or a three-dimensional mesh, textile, or felt.