Yu Chang Liu

US Patent:

6744727, Jun 1, 2004

Filed:

Aug 10, 2001

Appl. No.:

09/928287

Inventors:

Yu Liu - Raleigh NC
David TIpper - Pittsburgh PA

Assignee:

The University of Pittsburgh - Pittsburgh PA

International Classification:

H04L 1226

US Classification:

370228, 370217, 370218, 370221, 370225, 370226, 370227

Abstract:

A method is given for deriving a backup path routing spare capacity template that is feasible, scalable, adaptive, much faster, and near global optimal in redundancy reduction. The method includes determining working paths, aggregating the working paths into a first matrix, determining backup paths, aggregating the backup paths into a second matrix, and deriving the template from the first and second matrices. A method is also given for successively approximating the optimal spare capacity allocation needed for a network. The method includes, determining the link cost associated with a selected traffic flows backup path, determining an updated link cost that is less than the current link cost, determining a backup path with the updated link cost, and notifying the rest of the network of the backup path.

US Patent:

7639609, Dec 29, 2009

Filed:

Jul 15, 2007

Appl. No.:

11/778053

Inventors:

Gordon Bolt - Apex NC, US
Edward A. Sykes - Cary NC, US
Yu Liu - San Jose CA, US

Assignee:

OPNET Technologies, Inc. - Bethesda MD

International Classification:

H04L 12/26
G06F 15/177

US Classification:

370229, 370237, 370250, 370252, 709220, 709223

Abstract:

An existing network configuration is assessed, and potential changes to the existing configuration are identified that provide the greatest incremental improvements to the performance of the network. In a preferred embodiment, the user of the system identifies the maximum number (N) of changes that may be implemented in an existing network, and the system provides a set of possible reconfigurations, each requiring fewer than N changes. The user is presented a display of the potential improvement provided by each set as a function of the number of changes in the set, so that the relative incremental gain can be easily visualized. The objective function of the optimization may include conventional load-balancing objectives, or other objectives, such as a global minimization of path lengths.

US Patent:

7742177, Jun 22, 2010

Filed:

Jan 22, 2008

Appl. No.:

12/018028

Inventors:

Shifang Li - Pleasanton CA, US
Yu Liu - Sunnyvale CA, US

Assignee:

Tokyo Electron Limited - Tokyo

International Classification:

G01B 11/14

US Classification:

356625

Abstract:

The invention can provide apparatus and methods for processing wafers using Noise-Reduction (N-R) metrology models that can be used in Double-Patterning (D-P) processing sequences, Double-Exposure (D-E) processing sequences, or other processing sequences.

US Patent:

7889641, Feb 15, 2011

Filed:

Jul 18, 2007

Appl. No.:

11/779429

Inventors:

Yu Liu - San Jose CA, US
Gordon Bolt - Apex NC, US
Edward Sykes - Cary NC, US

Assignee:

Opnet Technologies, Inc. - Bethesda MD

International Classification:

G06F 11/00

US Classification:

370228

Abstract:

A path-flow formulation of defining MPLS FRR bypass LSPs is presented. The path-flow formulation comprises first identifying a set of candidate bypass LSPs, each of which meets various network constraints and has an explicit route around a network facility to be protected. The constraints may include Quality of Service (QoS) guarantees, implementation requirements, network element resource limitations, and resiliency requirements. The constraints may be user-selected, and may be non-linear. The set of candidate bypass LSPs form a linear programming (LP) problem, or an integer linear programming (ILP) problem if the allowable number of bypass LSPs is constrained. In an optimization step, LP solutions are used to select the bypass LSPs from among the candidate bypass LSPs by allocating bandwidth to them.

US Patent:

20120265061, Oct 18, 2012

Filed:

Oct 31, 2011

Appl. No.:

13/285167

Inventors:

John SLIWA - Los Altos Hills CA, US
Yu LIU - Irvine CA, US

Assignee:

ST. JUDE MEDICAL, INC. - St. Paul MN

International Classification:

A61B 6/00
A61B 8/00

US Classification:

600427, 600425

Abstract:

A method for performing elastographic deformation mapping of tissues and plaques comprises: introducing a distal portion of a catheter to an interior of an interior body of a patient; applying, from a palpator in the distal portion, one of a directed fluid or a mechanical indenter to produce a surface-applied palpation force to a target area of the interior body to mechanically displace the interior body and cause elastographic deformation of the target area of one or more surface and subsurface tissues and plaques; and directing and delivering an OCT (optical coherence tomography) beam, from an OCT imaging sensor in the distal portion, for OCT deformation detection including elastographic deformation measurement to provide elastographic mapping of the target area.

US Patent:

20120265062, Oct 18, 2012

Filed:

Oct 31, 2011

Appl. No.:

13/285178

Inventors:

John SLIWA - Los Altos Hills CA, US
Yu LIU - Irvine CA, US

Assignee:

ST. JUDE MEDICAL, INC. - St. Paul MN

International Classification:

A61B 6/00
A61B 8/00

US Classification:

600427, 600425

Abstract:

An optical coherence tomography (OCT) catheter, for performing high performance elastographic deformation mapping of tissues and plaques, comprises: a catheter having elongated catheter body extending longitudinally between a proximal end and a distal end along a longitudinal axis, the catheter body including a distal portion at the distal end and a catheter lumen; a palpator, disposed in the distal portion, to apply one of a directed fluid or a mechanical indenter to produce a surface-applied palpation force to a target area of the interior body to mechanically displace the interior body and cause elastographic deformation of the target area of one or more surface and subsurface tissues and plaques; and OCT imaging sensor, disposed in the distal portion, to direct and deliver OCT beam for OCT deformation detection including elastographic deformation measurement to provide elastographic mapping of the target area.

US Patent:

20130031378, Jan 31, 2013

Filed:

Jul 26, 2011

Appl. No.:

13/190860

Inventors:

Frederick R. Schindler - Sunnyvale CA, US
Yu Liu - Mountain View CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 1/00

US Classification:

713300

Abstract:

An apparatus and method for transferring power in an inline switch device are provided. The method comprises drawing power from an inline power source and transferring, by the powered device subsystem, a portion of the power that is not consumed by the powered device subsystem to one or more connected powered devices. The method further comprises determining a limit of current drawn by the powered device subsystem during transfer of power by the powered device subsystem to the one or more powered devices that results in the transfer of a desired amount of power to the one or more powered devices, and adjusting the limit for the current drawn by the powered device subsystem to the determined current limit.

US Patent:

20130209991, Aug 15, 2013

Filed:

Jan 10, 2013

Appl. No.:

13/738658

Inventors:

Northeastern University - , US
Yu Liu - Boston MA, US
Mehmet Remzi Dokmeci - Brookline MA, US

Assignee:

Northeastern University - Boston MA

International Classification:

G01N 27/02
A61B 5/1473
H01L 21/02

US Classification:

435 5, 422 8201, 422 8202, 422430, 436501, 435 71, 4352873, 438 49, 600345

Abstract:

Sensors based on single-walled carbon nanotubes (SWNT) are integrated into a microfluidic system outfitted with data processing and wireless transmission capability. The sensors combine the sensitivity, specificity, and miniature size of SWNT-based nanosensors with the flexible fluid handling power of microfluidic “lab on a chip” analytical systems. Methods of integrating the SWNT-based sensor into a microfluidic system are compatible with the delicate nature of the SWNT sensor elements. The sensor devices are capable of continuously and autonomously monitoring and analyzing liquid samples in remote locations, and are applicable to real time water quality monitoring and monitoring of fluids in living systems and environments. The sensor devices and fabrication methods of the invention constitute a platform technology, because the devices can be designed to specifically detect a large number of distinct chemical agents based on the functionalization of the SWNT. The sensors can be combined into a multiplex format that detects desired combinations of chemical agents simultaneously.