Andrew M Cheng

US Patent:

7249153, Jul 24, 2007

Filed:

Aug 1, 2003

Appl. No.:

10/633447

Inventors:

Andrew F. Cheng - Potomac MD, US
Lillian Nguyen - Ellicott City MD, US
Christopher A. Monaco - Silver Spring MD, US
Gordon G. Seagrave - Washington DC, US

Assignee:

The Johns Hopkins University - Baltimore MD

International Classification:

G06F 15/00
G06F 17/14

US Classification:

708203, 708400

Abstract:

The present invention is a method, system, and computer program product for implementation of a capable, general purpose compression algorithm that can be engaged “on the fly”. This invention has particular practical application with time-series data, and more particularly, time-series data obtained form a spacecraft, or similar situations where cost, size and/or power limitations are prevalent, although it is not limited to such applications. It is also particularly applicable to the compression of serial data streams and works in one, two, or three dimensions. The original input data is approximated by Chebyshev polynomials, achieving very high compression ratios on serial data streams with minimal loss of scientific information.

US Patent:

8630814, Jan 14, 2014

Filed:

Jan 31, 2011

Appl. No.:

13/017871

Inventors:

Andrew A. Cheng - Wilmette IL, US
James J. Gu - Buffalo Grove IL, US
John E. Branzell - Skokie IL, US

Assignee:

Xylem IP Holdings LLC. - White Plaines NY

International Classification:

G01F 23/296

US Classification:

702 55

Abstract:

Apparatus, including an ultrasonic liquid level gauge and control system, includes a gauge configured to be coupled on the outside of a device, having a boiler or hot water tank, having liquid contained therein. The gauge is also configured to receive and contain a small part of the liquid of the device; and an ultrasonic transducing and signal processing arrangement configured to: reflect an ultrasonic pulse off a liquid surface of the small part of the liquid of the device contained in the gauge, and determine the level of liquid in the device based at least partly on a time of flight analysis related to the ultrasonic pulse reflected off the liquid surface of the small part of the liquid of the device contained in the gauge.

US Patent:

20120173027, Jul 5, 2012

Filed:

Dec 30, 2010

Appl. No.:

12/982286

Inventors:

Andrew A. CHENG - Wilmette IL, US
James J. GU - Buffalo Grove IL, US

Assignee:

ITT MANUFACTURING ENTERPRISES, INC. - Wilmington DE

International Classification:

G05D 7/06
G05D 16/20

US Classification:

700282

Abstract:

The present invention provides, e.g., apparatus comprising at least one processor; at least one memory including computer program code; the at least one memory and computer program code being configured, with at least one processor, to cause the apparatus at least to: respond to signaling containing information about an instant pressure and a flow rate of fluid being pumped in a pumping system, and obtain an adaptive control curve based at least partly on the instant pressure and flow rate using an adaptive moving average filter. The adaptive moving average filter may be based at least partly on a system flow equation: SAMA=AMAF(Q/√{square root over (ΔP)}), where the function AMAF is an adaptive moving average filter (AMAF), and the parameters Q and ΔP are a system flow rate and differential pressure respectively. The at least one memory and computer program code may be configured to, with the at least one processor, to cause the apparatus at least to obtain an optimal control pressure set point from the adaptive control curve with respect to an instant flow rate or a moving average flow rate as SP=MA(Q)/SAMA, where the function MA is a moving average filter (MA), to obtain a desired pump speed through a PID control.

US Patent:

20200049152, Feb 13, 2020

Filed:

Aug 8, 2019

Appl. No.:

16/535773

Inventors:

- Morton Grove IL, US
Andrew A. CHENG - Wilmette IL, US

International Classification:

F04D 15/00
F04D 15/02

Abstract:

Apparatus, including a pump system, features a controller having a signal processor or processing module configured to:The signal processor or processing module is also configured to provide the corresponding signaling as control signaling to adjust the pump speed.