Patents by Inventor David E. Root

David E. Root has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11941337
    Abstract: A method of modeling a nonlinear component includes providing a physical model for modeling a characteristic of the nonlinear component defined by a physical expression having a physical nonlinear function depending on variables and parameters of the nonlinear component; determining performance data for the characteristic; extracting global parameter values for the parameters based on the performance data; extracting local parameter values for the selected parameter, while keeping fixed the extracted global parameter values for the remaining parameters, based on the performance data corresponding to the characteristic using the physical expression; training an ANN function from the extracted local parameter values for the selected parameter depending on a variable; and determining a hybrid model for modeling the characteristic of the nonlinear component defined by a modified physical expression including the physical nonlinear function, the remaining parameters, and the trained ANN function depending on the v
    Type: Grant
    Filed: July 31, 2021
    Date of Patent: March 26, 2024
    Assignee: KEYSIGHT TECHNOLOGIES, INC.
    Inventors: Jianjun Xu, David E. Root
  • Patent number: 11492670
    Abstract: The present invention relates to compositions and methods for targeting cancer-specific DNA sequences, such as copy number amplifications and other types of cancer-specific sequence variations, such as cancer-specific polymorphisms, insertions, or deletions. The present invention provides hereto sequence-specific DNA targeting agents targeting a sequence within the amplified DNA region or a sequence otherwise specific for a cancer cell compared to a non-cancer cell. The invention further relates to methods for treating cancer, comprising administering such sequence-specific DNA targeting agents. The invention further relates to methods for preparing sequence-specific DNA targeting agent, as well as screening methods using the DNA targeting agents.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: November 8, 2022
    Assignees: THE BROAD INSTITUTE INC., DANA-FARBER CANCER INSTITUTE, INC., INSTITUTO CARLOS SLIM DE LA SALUD, A.C.
    Inventors: William C. Hahn, Andrew Aguirre, April Cook, Glenn Cowley, Robin Meyers, David E. Root, Aviad Tsherniak, Barbara Weir, Francisca Vazquez
  • Publication number: 20170114413
    Abstract: The present invention relates to compositions and methods for targeting cancer-specific DNA sequences, such as copy number amplifications and other types of cancer-specific sequence variations, such as cancer-specific polymorphisms, insertions, or deletions. The present invention provides hereto sequence-specific DNA targeting agents targeting a sequence within the amplified DNA region or a sequence otherwise specific for a cancer cell compared to a non-cancer cell. The invention further relates to methods for treating cancer, comprising administering such sequence-specific DNA targeting agents. The invention further relates to methods for preparing sequence-specific DNA targeting agent, as well as screening methods using the DNA targeting agents.
    Type: Application
    Filed: October 20, 2016
    Publication date: April 27, 2017
    Inventors: William C. Hahn, Andrew Aguirre, April Cook, Glenn Cowley, Robin Meyers, David E. Root, Aviad Tsherniak, Barbara Weir, Francisca Vazquez
  • Patent number: 8533136
    Abstract: A method and system are provided for generating a nonlinear simulation model of a device under test (DUT). The method and system include receiving large-signal nonlinear waveform data based on responses of the DUT to input signals, determining a set of first dynamical variables and a set of second dynamical variables from the nonlinear waveform data, calculating values of second dynamical variables, providing nonlinear constitutive relations as functions of the first dynamical variables and the calculated values of the second dynamical variables, and compiling the nonlinear simulation model of the DUT using the identified nonlinear constitutive relations.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: September 10, 2013
    Assignee: Agilent Technologies, Inc.
    Inventors: Jianjun Xu, Jason M. Horn, Masaya Iwamoto, David E. Root
  • Patent number: 8170854
    Abstract: A model of a device is generated. An input port of the device is stimulated with a large amplitude signal having a central frequency. A first port of the device is perturbed with a small amplitude signal tone. The small amplitude signal tone is at a frequency offset slightly from a harmonic of the central frequency. Spectral component frequencies of a resulting signal from the device are obtained to determine model coefficients for the device. At least some of the spectral component frequencies occur at frequencies offset slightly from harmonics of the central frequency.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: May 1, 2012
    Assignee: Agilent Technologies, Inc.
    Inventors: David E. Root, David D. Sharrit, John Wood
  • Patent number: 7924026
    Abstract: A method for determining input tones required to produce a desired output includes the step of extracting a linearization of a spectral map representing a device under test (DUT) that i) is under drive of a large signal having one or more fundamental frequencies with associated amplitudes and phases, and ii) produces an approximation of a desired output having at least one unwanted spectral component. The method includes the further step of using an inverse of the extracted linearization to determine the input tones required to produce the desired output under a given load condition.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: April 12, 2011
    Assignee: Agilent Technologies, Inc.
    Inventors: Jason M. Horn, David E. Root, Daniel Gunyan, Jianjun Xu
  • Patent number: 7671605
    Abstract: The invention measures the X-parameters (or large-signal S and T scattering functions, sometimes called linearized scattering functions, which are the correct way to define “large-signal S-parameters”) with only two distinct phases for small-signals on a frequency grid established by intermodulation frequencies and harmonics of the large-tones, with guaranteed well-conditioned data from which the X-parameter functions can be solved explicitly, without the need for regression, and not limited by performance limits of the reference generator or phase-noise.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: March 2, 2010
    Assignee: Agilent Technologies, Inc.
    Inventors: Daniel B Gunyan, David E Root, Loren C Betts, Jason M Horn
  • Publication number: 20090237069
    Abstract: A method for determining input tones required to produce a desired output includes the step of extracting a linearization of a spectral map representing a device under test (DUT) that i) is under drive of a large signal having one or more fundamental frequencies with associated amplitudes and phases, and ii) produces an approximation of a desired output having at least one unwanted spectral component. The method includes the further step of using an inverse of the extracted linearization to determine the input tones required to produce the desired output under a given load condition.
    Type: Application
    Filed: March 24, 2008
    Publication date: September 24, 2009
    Inventors: Jason M. Horn, David E. Root, Daniel Gunyan, Jianjun Xu
  • Publication number: 20090184722
    Abstract: The invention measures the X-parameters (or large-signal S and T scattering functions, sometimes called linearized scattering functions, which are the correct way to define “large-signal S-parameters”) with only two distinct phases for small-signals on a frequency grid established by intermodulation frequencies and harmonics of the large-tones, with guaranteed well-conditioned data from which the X-parameter functions can be solved explicitly, without the need for regression, and not limited by performance limits of the reference generator or phase-noise.
    Type: Application
    Filed: January 17, 2008
    Publication date: July 23, 2009
    Inventors: Daniel B. Gunyan, David E. Root, Loren C. Betts, Jason M. Horn
  • Publication number: 20090031435
    Abstract: This invention relates to therapies for diseases involving splicing defects, such as spinal muscular atrophy (SMA), and methods to identify compounds for treating this disease. The invention specifically provides for therapies comprised of small molecule compounds identified by cell-based high-throughput screening assays. These assays utilize engineered splicing constructs that fuse pre-mRNA fragments to a reporter gene. The fragments contain exons and at least one intron of a gene mutated in such a way to cause disease. Additionally, the invention provides for methods to monitor the effects of drugs on splicing and gene expression in vivo, in transgenic animals.
    Type: Application
    Filed: November 29, 2007
    Publication date: January 29, 2009
    Inventors: Brent R. Stockwell, David E. Root
  • Patent number: 7295961
    Abstract: The present invention includes a method for generating a model of a circuit having an input port and an output port. The method determines an amplitude for current leaving the output port at a frequency ?k when a signal that includes a carrier at ?j modulated by a signal Vj(t) is input to the input port, wherein ?k is a harmonic of ?j. The determined amplitude is used to determine values for a set of constants, ak, such that a function fk(V,ak) provides an estimate of the current, Ik(t), leaving the output port at a frequency ?k when a signal having the form V ? ( t ) = Re ? ? k = 1 , H ? V k ? ( t ) ? exp ? ( j? k ? t ) is input to the input port. Here Vk(t) is a component of a set of values V. The fk(V,ak) are used to provide a simulator component adapted for use in a circuit simulator.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: November 13, 2007
    Assignee: Agilent Technologies, Inc.
    Inventors: David E. Root, Nicholas B. Tuffilaro, John Wood, Jan Verspecht
  • Publication number: 20040044063
    Abstract: This invention relates to therapies for diseases involving splicing defects, such as spinal muscular atrophy (SMA), and methods to identify compounds for treating this disease. The invention specifically provides for therapies comprised of small molecule compounds identified by cell-based high-throughput screening assays. These assays utilize engineered splicing constructs that fuse pre-mRNA fragments to a reporter gene. The fragments contain exons and at least one intron of a gene mutated in such a way to cause disease. Additionally, the invention provides for methods to monitor the effects of drugs on splicing and gene expression in vivo, in transgenic animals.
    Type: Application
    Filed: June 2, 2003
    Publication date: March 4, 2004
    Inventors: Brent Stockwell, David E. Root
  • Patent number: 5467291
    Abstract: A modeling system for active semiconductor devices, such as gallium arsenide field effect transistors, for nonlinear (e.g., harmonic balance) circuit simulation. The model enables fast and unambiguous construction (model generation) by explicit calculations applied to raw device response data obtained using an adaptive, automated data acquisition system employed to characterize the device. The automated data acquisition system obtains the data adaptively, taking more data where nonlinearities are most severe and within a calculated, safe operating range of the device. The system converts conventional d.c. and S-parameter data directly into a detailed, device-specific, large-signal model. The system is extremely fast and replaces the need for conventional parameter extraction based on circuit simulation and optimization techniques.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: November 14, 1995
    Assignee: Hewlett-Packard Company
    Inventors: Siqi Fan, David E. Root, Jeffrey W. Meyer