David Nathan Everett

US Patent:

7877737, Jan 25, 2011

Filed:

Jun 20, 2005

Appl. No.:

11/157074

Inventors:

Mark A. Austin - Laurel MD, US
Natalya Shmunis - Rockville MD, US
Virnal Mayank - Raipur, IN
David Frank Everett - Laurel MD, US

Assignee:

University of Maryland - College Park MD
The United States of America as represented by the United States National Aeronautics and Space Administration - Washington DC

International Classification:

G06F 9/45

US Classification:

717132

Abstract:

A method is provided for generating a graph data representation having a plurality of nodes corresponding to respective systems engineering requirements. The method includes accessing a first data representation of a collection of systems requirements and relationships therebetween and generating a second data representation of the collection of systems requirements. The generating the second data representation includes accessing respective systems requirements of the collection of systems requirements; creating a node to correspond to each accessed systems requirement if a node corresponding to the accessed systems requirement does not exist; and creating an edge between the created or pre-existing node and each node corresponding to a systems requirement having a relationship with the accessed systems requirement. Each node of the second data representation is a node of said graph data representation and corresponds to a different systems requirement of the collection of systems requirements.

US Patent:

54914680, Feb 13, 1996

Filed:

Jun 24, 1993

Appl. No.:

8/080843

Inventors:

David F. Everett - Gambrills MD
John W. Frech - Baltimore MD
Theodore Wright - Crownsville MD
Kelly M. Rodriquez - Columbia MD

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

G08B 2100

US Classification:

340572

Abstract:

An identification system with a reading device having a single turn transmission coil for continuously radiating alternating energy. A portable tag receives via a magnetic coupling, the energy from the reader and charges a storage capacitor to 5 volts. The capacitor is discharged rapidly during a time period less than the charging time period. This discharge of the capacitor powers a coded information transmission circuit during a small percentage of the duty cycle.

US Patent:

53173309, May 31, 1994

Filed:

Oct 7, 1992

Appl. No.:

7/957119

Inventors:

David F. Everett - Gambrills MD
Daniel C. Buck - Hanover MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H01Q 2100
G08B 1324

US Classification:

343867

Abstract:

A two-way communication system is provided having a stationary device and a portable passive device. The portable passive device has circuitry for storing and transmitting coded information. The stationary member transmits a signal at a first frequency via magnetic field and the portable passive device transmits coded information stored on circuitry provided therein at a second frequency also via a magnetic field. An antenna circuit is provided in the portable passive device having a parallel resonant circuit and a series resonant circuit. The parallel resonant circuit derives operating power from the signal at a first frequency for use in the circuitry provided in the portable passive device. The series resonant circuit transmits coded information at a second frequency.