Douglas M Schmidt

Author:

Douglas C. Schmidt

ISBN #:

0201604647

Author:

Douglas C. Schmidt

ISBN #:

0201607344

Author:

Douglas C. Schmidt

ISBN #:

0201633566

Author:

Douglas C. Schmidt

ISBN #:

0201795256

Author:

Douglas C. Schmidt

ISBN #:

0470059028

Author:

Douglas C. Schmidt

ISBN #:

0471248754

Author:

Douglas C. Schmidt

ISBN #:

0471486485

Author:

Douglas C. Schmidt

ISBN #:

0471606952

US Patent:

6502135, Dec 31, 2002

Filed:

Feb 15, 2000

Appl. No.:

09/504783

Inventors:

Edmund Colby Munger - Crownsville MD
Douglas Charles Schmidt - Severna Park MD
Victor Larson - Fairfax VA
Michael Williamson - South Riding VA

Assignee:

Science Applications International Corporation - San Diego CA

International Classification:

G06F 15173

US Classification:

709225, 709229, 709245

Abstract:

A plurality of computer nodes communicate using seemingly random Internet Protocol source and destination addresses. Data packets matching criteria defined by a moving window of valid addresses are accepted for further processing, while those that do not meet the criteria are quickly rejected. Improvements to the basic design include (1) a load balancer that distributes packets across different transmission paths according to transmission path quality; (2) a DNS proxy server that transparently creates a virtual private network in response to a domain name inquiry; (3) a large-to-small link bandwidth management feature that prevents denial-of-service attacks at system chokepoints; (4) a traffic limiter that regulates incoming packets by limiting the rate at which a transmitter can be synchronized with a receiver; and (5) a signaling synchronizer that allows a large number of nodes to communicate with a central node by partitioning the communication function between two separate entities.

US Patent:

6618761, Sep 9, 2003

Filed:

Feb 26, 2002

Appl. No.:

10/082164

Inventors:

Edmund Colby Munger - Crownsville MD
Douglas Charles Schmidt - Severna Park MD
Robert Dunham Short - Leesburg VA
Victor Larson - Fairfax VA
Michael Williamson - South Riding VA

Assignee:

Science Applications International Corp. - San Diego CA

International Classification:

G06F 15173

US Classification:

709241, 709242, 370232, 370234, 370237

Abstract:

Methods and systems allowing a plurality of computer nodes to communicate using weighted transmission paths are provided. A load balancer distributes packets across weighted transmission paths according to transmission path quality, which is monitored and updated from time to time. As transmission quality on a specific transmission path decreases, the weight assigned to that transmission path is reduced. Similarly, weights may be increased if transmission quality improves. The weights assigned to various transmission paths may correspond to a relative number of packets to be transmitted on each respective transmission path. The transmission path for each packet can be selected based on the weights of the various transmission paths. Using weights based on transmission quality, transmission paths with higher transmission quality are used more often than transmission paths with lower transmission quality, resulting in more efficient communications.

US Patent:

6691141, Feb 10, 2004

Filed:

Apr 13, 2001

Appl. No.:

09/833684

Inventors:

Douglas Charles Schmidt - Severna Park MD

Assignee:

Science Applications International Corp. - San Diego CA

International Classification:

G06F 758

US Classification:

708250, 708254

Abstract:

A method and apparatus are provided for generating a parameter value to be used as a parameter for a random number generator. A random value is generated and the random value is mapped to a prime number. The parameter value is generated by multiplying the prime number by previously selected prime numbers. Each parameter value is then used as one of a plurality of parameters for the random number generator.

US Patent:

6792439, Sep 14, 2004

Filed:

Apr 13, 2001

Appl. No.:

09/833962

Inventors:

Douglas Charles Schmidt - Severna Park MD

Assignee:

Science Applications International Corp. - San Diego CA

International Classification:

G06F 102

US Classification:

708250

Abstract:

A method and an apparatus are provided for combining a plurality of random number generators into a combined random number generator. The outputs of the plurality of generators are interleaved into a combined stream of random numbers selected from each of the plurality of random-number generators. A value of x is calculated by each of the random number generators. Each of the values of x is mapped to a respective arrival time t for each of the random number generators. One of the random number generators having an earliest respective arrival time t is determined. A random number based on the arrival time t is generated.

US Patent:

6834310, Dec 21, 2004

Filed:

Feb 26, 2002

Appl. No.:

10/082285

Inventors:

Edmund Colby Munger - Crownsville MD
Douglas Charles Schmidt - Severna Park MD
Victor Larson - Fairfax VA

Assignee:

Science Applications International Corp. - San Diego CA

International Classification:

G06F 1516

US Classification:

709232, 709235, 370355, 370389, 370390

Abstract:

A plurality of computer nodes communicate using seemingly random Internet Protocol source and destination addresses. Data packets matching criteria defined by a moving window of valid addresses are accepted for further processing, while those that do not meet the criteria are quickly rejected. Improvements to the basic design include (1) a load balancer that distributes packets across different transmission paths according to transmission path quality; (2) a DNS proxy server that transparently creates a virtual private network in response to a domain name inquiry; (3) a large-to-small link bandwidth management feature that prevents denial-of-service attacks at system chokepoints; (4) a traffic limiter that regulates incoming packets by limiting the rate at which a transmitter can be synchronized with a receiver; and (5) a signaling synchronizer that allows a large number of nodes to communicate with a central node by partitioning the communication function between two separate entities.

US Patent:

6907473, Jun 14, 2005

Filed:

Mar 31, 2003

Appl. No.:

10/401888

Inventors:

Douglas Charles Schmidt - Severna Park MD, US

Assignee:

Science Applications International Corp. - San Diego CA

International Classification:

G06F015/16
G06F011/00

US Classification:

709248, 714707

Abstract:

A plurality of computer nodes communicate using seemingly random Internet Protocol source and destination addresses. Data packets matching criteria defined by a moving window of valid addresses are accepted for further processing, while those that do not meet the criteria are quickly rejected. Improvements to the basic design include (1) a load balancer that distributes packets across different transmission paths according to transmission path quality; (2) a DNS proxy server that transparently creates a virtual private network in response to a domain name inquiry; (3) a large-to-small link bandwidth management feature that prevents denial-of-service attacks at system chokepoints; (4) a traffic limiter that regulates incoming packets by limiting the rate at which a transmitter can be synchronized with a receiver; and (5) a signaling synchronizer, that allows a large number of nodes to communicate with a central node by partitioning the communication function between two separate entities.

US Patent:

6984467, Jan 10, 2006

Filed:

Sep 24, 2002

Appl. No.:

10/253469

Inventors:

Douglas S. Schmidt - North Attleboro MA, US
George R. Folser - Lower Burrell PA, US

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

H01M 4/86

US Classification:

429 41, 429 32, 429 44, 429 45

Abstract:

A plasma sprayed ceria-containing interlayer is provided. The interlayer has particular application in connection with a solid oxide fuel cell used within a power generation system. The fuel cell advantageously comprises an air electrode, a plasma sprayed interlayer disposed on at least a portion of the air electrode, a plasma sprayed electrolyte disposed on at least a portion of the interlayer, and a fuel electrode applied on at least a portion of the electrolyte.

US Patent:

7010604, Mar 7, 2006

Filed:

Oct 29, 1999

Appl. No.:

09/429643

Inventors:

Edmund Colby Munger - Crownsville MD, US
Vincent J. Sabio - Columbia MD, US
Virgil D. Gligor - Chevy Chase MD, US
Douglas Charles Schmidt - Severna Park MD, US

Assignee:

Science Applications International Corporation - San Diego CA

International Classification:

G06F 15/16

US Classification:

709227, 709245

Abstract:

A plurality of computer nodes communicates using seemingly random IP source and destination addresses and (optionally) a seemingly random discriminator field. Data packets matching criteria defined by a moving window of valid addresses are accepted for further processing, while those that do not meet the criteria are rejected. In addition to “hopping” of IP addresses and discriminator fields, hardware addresses such as Media Access Control addresses can be hopped. The hopped addresses are generated by random number generators having non-repeating sequence lengths that are easily determined a-priori, which can quickly jump ahead in sequence by an arbitrary number of random steps and which have the property that future random numbers are difficult to guess without knowing the random number generator's parameters. Synchronization techniques can be used to re-establish synchronization between sending and receiving-nodes. These techniques include a self-synchronization technique in which a sync field is transmitted as part of each packet, and a “checkpoint” scheme by which transmitting and receiving nodes can advance to a known point in their hopping schemes.