Gang Min Q 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:

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:

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.

US Patent:

8369238, Feb 5, 2013

Filed:

Jun 14, 2010

Appl. No.:

12/814987

Inventors:

Gang Xu - Piscataway NJ, US
Xiao Pan - Middletown NJ, US

Assignee:

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

International Classification:

G08C 15/00

US Classification:

370252, 709226

Abstract:

A method, network, and computer program product are provided for traffic flow quality of service. A quality of service priority table is received for services defined by a user at the network, and the quality of service priority table includes quality of service levels for the services. Traffic flows are determined to correspond to packets being communicated over the network for the user. The traffic flows are mapped to services. The traffic flows are mapped to the quality of service levels for the services. The quality of service levels are assigned to the traffic flows as assigned quality of service levels corresponding to the services. Each of the traffic flows is routed over the network according to its assigned quality of service levels, respectively.

US Patent:

8406987, Mar 26, 2013

Filed:

Oct 4, 2012

Appl. No.:

13/644302

Inventors:

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:

8566465, Oct 22, 2013

Filed:

Sep 17, 2010

Appl. No.:

12/884976

Inventors:

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

Assignee:

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

International Classification:

G06F 15/173

US Classification:

709229, 709226

Abstract:

A method includes sending a first redirect instruction to a first client in response to a first session request received at a service address, and establishing a first session with the first client in response to a second session request received at the first redirect address indicated by the first redirect instruction. Additionally, the method includes determining a first service interval has passed, and sending a second redirect instruction to a second client in response to a third session request received at the service address after the first service interval has passed. The method still further includes establishing a second session with the second client in response to the fourth session request received at the second redirect address indicated by the second redirect instruction after the first service interval has passed, and rejecting the fifth session request received from a third client at the first redirect address after the first service interval has passed.

US Patent:

8635669, Jan 21, 2014

Filed:

Nov 9, 2012

Appl. No.:

13/673548

Inventors:

Gang Xu - Piscataway NJ, US

Assignee:

AT&T Properties, LLC - Reno NV

International Classification:

G06F 21/52

US Classification:

726 3, 726 4, 726 5, 713156, 713165, 713166, 713167, 713168, 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.