Li Juan Zhang

US Patent:

6957357, Oct 18, 2005

Filed:

Jul 31, 2001

Appl. No.:

09/920138

Inventors:

Zhen Liu - Tarrytown NY, US
Cathy Honghui Xia - White Plains NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F001/04

US Classification:

713503, 713400

Abstract:

A method, computer program product, and data processing system for estimating and correcting the amount of clock skew in end-to-end network timing measurements is disclosed. Measured delays are combined with their time of measurement to create ordered pairs. These ordered pairs represent points within a Cartesian plane. The convex hull of these points is determined, and an optimal line segment from the resulting polygon is selected and extrapolated to create an affine function estimating clock skew over time. The optimal line segment of the polygon is one that optimizes a selected objective function. The objective function is selected so as to be an appropriate measurement of the accuracy of the resulting linear function as an estimate of the actual clock skew.

US Patent:

7194649, Mar 20, 2007

Filed:

May 29, 2002

Appl. No.:

10/157610

Inventors:

Zhen Liu - Tarrytown NY, US
Cathy Honghui Xia - White Plains NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/12

US Classification:

713400, 713375, 713503

Abstract:

Several algorithms are provided to estimate and remove relative clock skews from delay measurements based on the computation of convex hulls. The algorithms are linear in the number of measurement points for the case with no clock resets. For the more challenging case with clock resets, i. e. , the clocks are reset to some reference times during the measurement period, linear algorithms are provided to identify the clock resets and derive the best clock skew lines. The algorithms are also extended to environments in which at least one of the clocks is controlled by Network Time Protocol. These algorithms can also be extended for active clock synchronization to replace or further improve Network Time Protocol.

US Patent:

7203349, Apr 10, 2007

Filed:

Jan 29, 2002

Appl. No.:

10/059848

Inventors:

Li Zhang - Plainsboro NJ, US
Li Fan - Plainsboro NJ, US
Jianzhong Qian - Princeton Junction NJ, US

Assignee:

Siemens Corporate Research, Inc. - Princeton NJ

International Classification:

G06K 9/00

US Classification:

382128, 128922, 378 4

Abstract:

A system and method for automatically reducing false-positive nodule candidates associated with airways includes receiving a nodule candidate, testing for airway cavities connected to the candidate, and recognizing the candidate as a false-positive nodule candidate if it is connected to an airway cavity; where the testing may include perpendicular testing for airways that are relatively perpendicular to an examination plane and parallel testing for airways that are relatively parallel to an examination plane.

US Patent:

7209581, Apr 24, 2007

Filed:

Jul 23, 2004

Appl. No.:

10/898511

Inventors:

Li Zhang - Skillman NJ, US
Ming Fang - Princeton Jct. NJ, US

Assignee:

Siemens Medical Solutions USA, Inc. - Malvern PA

International Classification:

G06K 9/00

US Classification:

382131, 382173

Abstract:

A system and method for ground glass nodule (GGN) segmentation is provided. The method comprises: selecting a point in a medical image, wherein the point is located in a GGN; defining a volume of interest (VOI) around the point, wherein the VOI comprises the GGN; removing a chest wall from the VOI; obtaining an initial state for a Markov random field; and segmenting the VOI, wherein the VOI is segmented using the Markov random field.

US Patent:

7272707, Sep 18, 2007

Filed:

May 19, 2004

Appl. No.:

10/849357

Inventors:

Zhen Liu - Tarrytown NY, US
Mukund Raghavachari - Baldwin Place NY, US
Bowei Xi - Beijing, CN
Cathy Honghui Xia - Croton-on-Hudson NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/177

US Classification:

713 1, 707 3, 706 19, 718102, 709223

Abstract:

In one embodiment, the present invention is a method and apparatus for automatic system parameter configuration for performance improvement. One embodiment of the inventive method involves formulating a black box optimization problem, and solving the optimization problem using an enhanced smart hill climbing method. The smart hill climbing method includes both a global and a more precise local search to identify an optimal solution. In one embodiment, one or both of the global and local searches employs a weighted Latin Hypercube Sampling method in combination with importance sampling techniques to yield improved search results.

US Patent:

7289653, Oct 30, 2007

Filed:

Dec 13, 2004

Appl. No.:

11/010813

Inventors:

Li Zhang - Skillman NJ, US
Ming Fang - Princeton Jct. NJ, US

Assignee:

Siemens Corporate Research, Inc. - Princeton NJ

International Classification:

G06K 9/00

US Classification:

382131, 382173

Abstract:

A system and method for ground glass nodule (GGN) segmentation is provided. The method comprises: selecting a point in a medical image, wherein the point is located in a GGN; defining a volume of interest (VOI) around the point, wherein the VOI comprises the GGN; removing a chest wall from the VOI; obtaining an initial state for a Markov random field; segmenting the VOI, wherein the VOI is segmented using the Markov random field; identifying vessels in the volume of interest; segmenting the vessels; and removing segmented vessels from the segmented ground glass nodule.

US Patent:

7296256, Nov 13, 2007

Filed:

Oct 20, 2003

Appl. No.:

10/689807

Inventors:

Zhen Liu - Tarrytown NY, US
Petar Momcilovic - New York NY, US
Honghui Xia - Croton-on-Hudson NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 9/44
G06F 9/45

US Classification:

717104, 717149, 717154

Abstract:

Method for modeling the performance of an Information Technology system are disclosed. The method includes the steps of receiving performance data of the system; receiving data of transaction flows and system topology; and inferring service demand parameters based on the received data. If closed form expressions are available to characterize the system, an optimization algorithm based on minimum distance between predicted and measured response times and may be used to obtain the performance parameters. Alternatively, a discrete event simulator together with a set of meta-heuristic search methods may be applied to obtain the optimized performance parameters.

US Patent:

7490234, Feb 10, 2009

Filed:

Aug 3, 2007

Appl. No.:

11/833345

Inventors:

Zhen Liu - Tarrytown NY, US
Mukund Raghavachari - Baldwin Place NY, US
Bowei Xi - Beijing, CN
Cathy Honghui Xia - Croton-on-Hudson NY, US
Li Zhang - Yorktown Heights NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/177
G06F 7/08

US Classification:

713 1, 713100, 707 3, 706 19

Abstract:

In one embodiment, the present invention is a method and apparatus for automatic system parameter configuration for performance improvement. One embodiment of the inventive method involves formulating a black box optimization problem, and solving the optimization problem using an enhanced smart hill climbing method. The smart hill climbing method includes both a global and a more precise local search to identify an optimal solution. In one embodiment, one or both of the global and local searches employs a weighted Latin Hypercube Sampling method in combination with importance sampling techniques to yield improved search results.