David B Hanks

US Patent:

7997060, Aug 16, 2011

Filed:

Oct 30, 2007

Appl. No.:

11/928204

Inventors:

Christopher M. Erickson - Thousand Oaks CA, US
James R. Lobitz - Oak Park CA, US
William R. Bissell - Westlake Village CA, US
David E. Hanks - West Hills CA, US
Corey D. Brown - North Palm Beach FL, US

Assignee:

Pratt & Whitney Rocketdyne, Inc. - Canoga Park CA

International Classification:

F02K 9/46

US Classification:

60259, 60260, 60266

Abstract:

An expander heat exchanger cycle system provides a fuel or oxidizer routed through a heat exchanger to cool and condense a coolant/turbine drive fluid.

US Patent:

57177872, Feb 10, 1998

Filed:

Apr 16, 1996

Appl. No.:

8/633386

Inventors:

John Thomas Feo - Dublin CA
David Carlton Hanks - San Ramon CA
Thomas Arthur Kraay - Leeburg VA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G06K 936
G06K 946

US Classification:

382232

Abstract:

A method for compressing data for storage or transmission. Given a complex polynomial and a value assigned to each root, a root generated data file (RGDF) is created, one entry at a time. Each entry is mapped to a point in a complex plane. An iterative root finding technique is used to map the coordinates of the point to the coordinates of one of the roots of the polynomial. The value associated with that root is assigned to the entry. An equational data compression (EDC) method reverses this procedure. Given a target data file, the EDC method uses a search algorithm to calculate a set of m complex numbers and a value map that will generate the target data file. The error between a simple target data file and generated data file is typically less than 10%. Data files can be transmitted or stored without loss by transmitting the m complex numbers, their associated values, and an error file whose size is at most one-tenth of the size of the input data file.