David A Levin

US Patent:

6567567, May 20, 2003

Filed:

Jan 24, 2000

Appl. No.:

09/490412

Inventors:

David N. Levin - Chicago IL
Scott Nagle - Oak Park IL

Assignee:

ARCH Development Corp. - Chicago IL

International Classification:

G06K 936

US Classification:

382284, 382128

Abstract:

A method and apparatus are provided for transceiving a signal. The method includes the steps of transmitting a superposed frequency component of the signal within each of a plurality of non-adjacent frequency bands, using analogue or digital filters within a receiver to suppress all signals outside the plurality of frequency bands and to pass a filtered signal within the plurality of non-adjacent frequency bands, determining a set of substantially non-uniformly spaced times at which the filtered signal within the plurality of non-adjacent frequency bands should be sampled and sampling the filtered signal at the determined times to provide sampled data. The method further includes the steps of Fourier transforming subsets of the sampled data, linearly combining the Fourier transformed subsets using a reconstruction matrix and extracting the signal from the linear combinations of the Fourier transformed subsets.

US Patent:

6687657, Feb 3, 2004

Filed:

Sep 25, 2001

Appl. No.:

09/962768

Inventors:

David N. Levin - Chicago IL 60614

International Classification:

G06F 1300

US Classification:

702189, 702125, 702126, 702178, 702198

Abstract:

The inventive method and apparatus include sensory devices that invariantly represent stimuli in the presence of processes that cause systematic sensor state transformations. Such processes include: 1) alterations of the devices detector, 2) changes in the observational environment external to the sensory device and the stimuli, and 3) certain modifications of the presentation of the stimuli themselves. A specific embodiment of the present invention is an intelligent sensory device having a âfront endâ comprised of such a representation âengineâ. The detectors of such a sensory device need not be recalibrated, and its pattern analysis module need not be retrained, in order to account for the presence of the above-mentioned transformative processes. Another embodiment of the present invention is a communications system that encodes messages as representations of signals. The message is not corrupted by signal transformations due to a wide variety of processes affecting the transmitters, receivers, and the channels between them.

US Patent:

20020107226, Aug 8, 2002

Filed:

Jul 22, 1999

Appl. No.:

09/359325

Inventors:

VIVIAN BERLIN - DUNSTABLE MA, US
DAVID E. LEVIN - OWINGS MILLS MD, US
YOSHIKAZU OHYA - TOKYO, JP

International Classification:

A61K031/665
A01N057/00

US Classification:

514/100000

Abstract:

The present invention relates to rapid, reliable and effective assays for screening and identifying pharmaceutically effective compounds that specifically inhibit the biological activity of fungal GTPase proteins, particularly GTPases involved in cell wall integrity, hyphael formation, and/or other cellular functions critical to pathogenesis.

US Patent:

20080147763, Jun 19, 2008

Filed:

Dec 7, 2007

Appl. No.:

11/952284

Inventors:

David Levin - Chicago IL, US

International Classification:

G06F 17/14

US Classification:

708400

Abstract:

Given a time series of possibly multicomponent input data, the method and apparatus includes a device that finds a time series of “source” components, which are possibly nonlinear combinations of the input data components and which can be partitioned into groups that are statistically independent of one another. These groups of source components are statistically independent in the sense that the phase space density function of the source time series is approximately equal to the product of density functions, each of which is a function of the components (and their time derivatives) in one of the groups. In a specific embodiment, an unknown mixture of data from multiple independent source systems (e.g., a transmitter of interest and noise producing system) is processed to extract information about at least one source system (e.g., the transmitter of interest).

US Patent:

50819925, Jan 21, 1992

Filed:

Nov 30, 1990

Appl. No.:

7/622204

Inventors:

David N. Levin - Chicago IL
Xiaoping Hu - Chicago IL
Paul C. Lauterbur - Urbana IL
Thomas Spraggins - Charlottesville VA

Assignee:

Siemens Medical Systems - Iselin NJ

International Classification:

A61B 5055

US Classification:

1286532

Abstract:

An MR imaging study precedes an MR spectroscopic study. Structural information from the imaging study is combined with MR spectra from the spectroscopic study to produce localized MR spectra.

US Patent:

57519412, May 12, 1998

Filed:

Apr 4, 1996

Appl. No.:

8/627629

Inventors:

David Hinds - Wakefield MA
Ana Kapetanakis - Nashua NH
Stephen J. McFarland - Groton MA
Mark C. Campbell - Billerica MA
David S. Levin - Concord MA
David J. Miller - Burlington MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1100

US Classification:

39518314

Abstract:

A software testing system tests software. The software testing system includes a set-up and control system, and one or more test systems connected to the set-up and control system. The set-up and control system includes a user interface for interacting with a user of the software testing system. The set-up and control system stores test data and test configurations. Each test system sets up test cases from the test data and the test configurations stored in the set-up and control system. Each test case inherits attributes from at least one test object within the test system. The inherited attributes facilitates the interaction of the test system with the test cases.

US Patent:

60931531, Jul 25, 2000

Filed:

Aug 4, 1998

Appl. No.:

9/128863

Inventors:

David N. Levin - Chicago IL

International Classification:

A61B 504

US Classification:

600558

Abstract:

A method for measuring perception of an observer comprises a) selecting a first, second, and third stimulus and presenting the stimuli to the observer; b) determining observer-defined fourth stimulus such that the observer perceives the fourth stimulus to be related to the third stimulus in the same way as the observer perceives the second stimulus to be related to the first stimulus; c) selecting a new first, second, and third stimulus, at least one of the new stimuli corresponding to a stimulus point that is different from the stimulus points corresponding to the previously selected stimulus; d) determining a new observer-defined fourth stimulus such that the observer perceives the new fourth stimulus to be related to the new third stimulus in the same way as the observer perceives the new second stimulus to be related to the new first stimulus; and e) performing steps (c) through (d) until a predetermined number of sets of four stimuli are determined.

US Patent:

60186003, Jan 25, 2000

Filed:

Apr 15, 1998

Appl. No.:

9/061513

Inventors:

David N. Levin - Chicago IL
Scott Nagle - Oak Park IL

Assignee:

ARCH Development Corp. - Chicago IL

International Classification:

G06K 936

US Classification:

382284

Abstract:

A method and apparatus are provided for acquiring and reconstructing an image. The method includes the steps of obtaining prior knowledge of the image, possibly by coarse sampling of the image and using the obtained prior knowledge of the image to identify relative locations of structures having relatively high contrast edges. The method further includes the steps of prescribing a set of k-space locations based upon the relative locations of the structures in order to achieve comparable eigenvalues of a reconstruction matrix and sampling the k-space at the prescribed k-space locations to obtain k-space sample data. The k-space sample data are decomposed into background data and edge data. The background data are Fourier transformed to reconstruct a background image component. Similarly, subsets of the edge data are Fourier transformed and the reconstruction matrix is used to form a linear combination of these Fourier transformations in order to reconstruct an edge image component.