Gang L Xu

US Patent:

7676352, Mar 9, 2010

Filed:

Apr 19, 2005

Appl. No.:

11/109840

Inventors:

David J. Van Peursem - Irvine CA, US
Gang Xu - Corona CA, US

Assignee:

Invensys Systems, Inc. - Foxboro MA

International Classification:

G06F 9/455

US Classification:

703 9, 703 2, 73 2501, 137828

Abstract:

A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.

US Patent:

7930733, Apr 19, 2011

Filed:

Apr 10, 2006

Appl. No.:

11/400876

Inventors:

Liviu Iftode - Princeton NJ, US
Gang Xu - Piscataway NJ, US

Assignee:

AT&T Intellectual Property II, L.P. - Atlanta GA
Rutgers, The State University of New Jersey - New Brunswick NJ

International Classification:

G06F 7/04

US Classification:

726 5, 713155, 713156, 713164, 713165, 713166, 713167, 713168, 711152

Abstract:

A system and method of providing trusted service transactions includes associating a commitment with a remote service. The commitment includes a trusted list of runtime dependencies to execute a transaction. The method includes monitoring an actual list of runtime dependencies invoked during execution of the transaction using a trusted monitor. Execution is blocked if a deviation of the actual list from the trusted list is detected. Therefore, a completed transaction is allowed only if no deviation is found between the trusted and invoked list of runtime dependencies. A certificate authority in cooperation with software vendors preferably provide a signed commitment. The commitment is delivered by the provider to a user upon request and verified by the requester. The transaction is then executed by the user. Therefore, trust is verified before and during the transaction and privacy of data is guaranteed after completion.

US Patent:

7987082, Jul 26, 2011

Filed:

Feb 1, 2010

Appl. No.:

12/698063

Inventors:

David J. Van Peursem - Irvine CA, US
Gang Xu - Corona CA, US

Assignee:

Invensys Systems, Inc. - Foxboro MA

International Classification:

G06F 9/455

US Classification:

703 9, 73 2501

Abstract:

A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.

US Patent:

8165860, Apr 24, 2012

Filed:

Aug 25, 2009

Appl. No.:

12/547145

Inventors:

Gang Xu - Irvine CA, US
David Bluck - Yorba Linda CA, US
David J. Van Peursem - Irvine CA, US
Ian H. Boys - Vista CA, US

Assignee:

Invensys Systems, Inc - Foxboro MA

International Classification:

G06F 9/455

US Classification:

703 12

Abstract:

A system for thermodynamic modeling is provided. The system comprises a computer having a processor, a thermodynamic process simulation application, and a thermodynamic equation of state application. When executed by the processor, the thermodynamic equation of state application determines a density root based on a first and second point of departure from an equation of state and based on a first and a second extrapolation equation. The first departure point satisfies the equation.

US Patent:

8296046, Oct 23, 2012

Filed:

Dec 8, 2009

Appl. No.:

12/632969

Inventors:

Gustavo de los Reyes - Fair Haven NJ, US
Gang Xu - Piscataway NJ, US

Assignee:

AT&T Intellectual Property I, L.P. - Atlanta GA

International Classification:

G01C 21/34
G08G 1/01

US Classification:

701118, 701410, 4554565

Abstract:

A cellular-based live traffic service that does not require pre-deployment of infrastructure or GPS-enabled devices uses signals provided by cellular devices to determine course resolution localization and tracking information of the cellular devices. Specialized statistical analysis is performed on the course resolution data to infer the fine resolution positions of the cellular devices. In an example embodiment, the localization and tracking information is provided on a map, or the like, to show relative position and/or trajectory of cellular devices.

US Patent:

8302189, Oct 30, 2012

Filed:

Nov 30, 2009

Appl. No.:

12/627733

Inventors:

Gustavo de los Reyes - Fair Haven NJ, US
Thusitha Jayawardena - Holmdel NJ, US
Gang Xu - Piscataway NJ, US

Assignee:

AT&T Intellectual Property I, L.P. - Reno NV

International Classification:

G06F 21/00

US Classification:

726 22, 713188, 726 24

Abstract:

An edge monitoring approach can be utilized to detect an attack which includes a plurality of relatively low bandwidth attacks, which are aggregated at a victim sub-network. The aggregated low bandwidth attacks can generate a relatively high bandwidth attack including un-solicited data traffic directed to the victim' so that the aggregated attack becomes more detectable at an edge monitor circuit located proximate to the victim. Related systems, devices, and computer program products are also disclosed.

US Patent:

8332632, Dec 11, 2012

Filed:

Apr 12, 2011

Appl. No.:

13/084614

Inventors:

Liviu Iftode - Princeton NJ, US
Gang Xu - Piscataway NJ, US

Assignee:

AT&T Intellectual Property II, LP - Atlanta GA
Rutgers, The State University of New Jersey - New Brunswick NJ

International Classification:

H04L 29/06

US Classification:

713156, 713164, 713165, 713166, 713167, 713168, 726 4, 726 5, 711152

Abstract:

A system and method to ensure trustworthiness of a remote service provided by a service provider. The method includes monitoring runtime dependencies invoked during execution of a service transaction associated with the remote service, the service transaction being requested by a service requester. The method further includes determining whether a deviation exists between the runtime dependencies and a trusted list of dependencies associated with the remote service. The method also includes blocking execution of the service transaction based on determining that the deviation between the runtime dependencies and the trusted list of dependencies exists.

US Patent:

8364316, Jan 29, 2013

Filed:

Sep 15, 2009

Appl. No.:

12/560134

Inventors:

Gang Xu - Irvine CA, US
David Bluck - Yorba Linda CA, US

Assignee:

Invensys Systems, Inc. - Foxboro MA

International Classification:

G01N 15/06
G01N 33/00
G01N 33/48

US Classification:

700270, 700 1, 700266, 702 22, 702 30, 702 31, 702127

Abstract:

A method of modeling phase characteristics of thermodynamic systems utilizing pseudo-properties strategy and a reduced number of variables is disclosed herein. The method describes a means of determining the probability of phase splitting of mixtures of materials at a given temperature, pressure, and composition by characterizing the functions that describe the system via pseudo-properties, and also by describing the system in n−1 or fewer variables, where n represents the number of components in the system of interest. In an embodiment, a multi-component system is characterized in one variable, thereby providing simplified thermodynamic models in a time-efficient manner. In addition, the information generated by this reduced-variable calculation can further be used as a starting point for calculations of equations of state.