David R Akers

US Patent:

20120209985, Aug 16, 2012

Filed:

Feb 15, 2011

Appl. No.:

13/027288

Inventors:

David R. Akers - Los Gatos CA, US

International Classification:

G06F 15/173

US Classification:

709224

Abstract:

A computer-implemented process () for detecting service failures of a network application under test (NAUT: ) involves collecting () raw network-application availability monitoring (NAAM) data (). The NAAM data can include datapoints, each which specifies the network application under test (NAUT), a respective test site (); a time corresponding to a respective probe, and an indication whether the respective probe resulted in a success or a failure. The raw NAAM data is filtered () to remove datapoints indicating failures associated with causes other than a service failure of the NAUT. The filtered NAAM data () is analyzed to detect () a service failure () of the NAUT.

US Patent:

52998100, Apr 5, 1994

Filed:

Jun 23, 1992

Appl. No.:

7/902482

Inventors:

Mark S. Pierce - Palo Alto CA
Milton H. Loper - Mountain View CA
Dennis D. Harper - Campbell CA
David S. Akers - Fremont CA
Samuel Lee - San Jose CA

Assignee:

Atari Games Corporation - Milpitas CA

International Classification:

A63F 922

US Classification:

273434

Abstract:

A vehicle simulator has tandem surfaces for supporting first and second users, who "drive" respective first and simulated vehicles through a simulated space. A solenoid is mounted underneath each surface for selectively impacting the associated surface to give the user the sensation of having his simulated vehicle hit by a projectile. Each user sits in front of a video monitor, and each monitor is electrically connected to a computer. Each computer has a "map" of a simulated space stored in its electronic memory, and the computers are linked through a common RAM. The computers cause their monitors to display a changing video image of the simulated space to model motion of the simulated vehicles through the space, in response to signals from controls that can be manipulated by the operators. Each user controls a trigger which can be pushed to initiate the motion of a simulated projectile through the simulated space toward the user's vehicle. The computer of the shooter sends a signal to the RAM to indicate that s hot has been initiated.

US Patent:

45171548, May 14, 1985

Filed:

Jul 27, 1982

Appl. No.:

6/402053

Inventors:

Ulric E. Dennis - San Jose CA
Dennis W. Hollenbeck - San Jose CA
John A. Kirtland - San Jose CA
Kenneth B. Stackhouse - San Jose CA
Patricia A. Wilson - San Jose CA
William D. Hill - San Jose CA
David D. Akers - Los Gatos CA
Elmer D. Hill - Sacramento CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 1700

US Classification:

376259

Abstract:

A self-test system for a nuclear power plant, nuclear reactor protection system is disclosed. Nuclear protection systems are the electronic controls, typically including circuit cards, located intermediate between sensors (as for detecting core overheat) and a control (as for providing rod injection to shut down a reactor). Constant surveillance of the nuclear system protection system is provided by a microprocessor that serially addresses protection system circuit cards and loads them at pre-determined input points with test commands. The addressed cards are thereafter simultaneously activated by a system-wide command. The test command is a pulse which is so short in duration that its affect is transparent to the system and cannot cause overall system operation. The pulse passes through the actuating electrical components to verify, on the real actuating path, the operating integrity of the system. After an appropriate response interval, the output state of the system is recorded in system-wide resident registers.

US Patent:

46282777, Dec 9, 1986

Filed:

May 1, 1985

Appl. No.:

6/729455

Inventors:

William D. Hill - San Jose CA
David D. Akers - Los Gatos CA

Assignee:

General Electric Company - San Jose CA

International Classification:

H03F 134

US Classification:

330110

Abstract:

A femtoammeter is disclosed which resists noise induced reversed bias of the ammeter amplifier and avoids long time constant recovery with unusually high measurement accuracy. The amplifier ammeter has a feedback loop which is provided with paired opposingly faced log diodes in parallel across the feedback circuit. Transients of negative or positive bias are accommodated without biasing the amplifier to a reverse polarity and having unacceptably long time constant recovery. Conventional temperature compensation, not possible with the parallel reversed diode configuration, is supplied by heat sinking the ammeter components, providing a log diode temperature sensor for the heat sinked components and controlling the heat sink operating temperature with a thermoelectric cooler. The temperature sensing log diodes output to a computer lookup table. The same temperature sensing log diode outputs to a bridge circuit operating the thermoelectric cooler.