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).
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Patent number: 11941337Abstract: 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 vType: GrantFiled: July 31, 2021Date of Patent: March 26, 2024Assignee: KEYSIGHT TECHNOLOGIES, INC.Inventors: Jianjun Xu, David E. Root
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Patent number: 11492670Abstract: 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: GrantFiled: October 20, 2016Date of Patent: November 8, 2022Assignees: 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
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Publication number: 20170114413Abstract: 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: ApplicationFiled: October 20, 2016Publication date: April 27, 2017Inventors: William C. Hahn, Andrew Aguirre, April Cook, Glenn Cowley, Robin Meyers, David E. Root, Aviad Tsherniak, Barbara Weir, Francisca Vazquez
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Patent number: 8533136Abstract: 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: GrantFiled: February 28, 2011Date of Patent: September 10, 2013Assignee: Agilent Technologies, Inc.Inventors: Jianjun Xu, Jason M. Horn, Masaya Iwamoto, David E. Root
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Patent number: 8170854Abstract: 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: GrantFiled: January 14, 2005Date of Patent: May 1, 2012Assignee: Agilent Technologies, Inc.Inventors: David E. Root, David D. Sharrit, John Wood
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Patent number: 7924026Abstract: 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: GrantFiled: March 24, 2008Date of Patent: April 12, 2011Assignee: Agilent Technologies, Inc.Inventors: Jason M. Horn, David E. Root, Daniel Gunyan, Jianjun Xu
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Patent number: 7671605Abstract: 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: GrantFiled: January 17, 2008Date of Patent: March 2, 2010Assignee: Agilent Technologies, Inc.Inventors: Daniel B Gunyan, David E Root, Loren C Betts, Jason M Horn
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Publication number: 20090237069Abstract: 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: ApplicationFiled: March 24, 2008Publication date: September 24, 2009Inventors: Jason M. Horn, David E. Root, Daniel Gunyan, Jianjun Xu
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Publication number: 20090184722Abstract: 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: ApplicationFiled: January 17, 2008Publication date: July 23, 2009Inventors: Daniel B. Gunyan, David E. Root, Loren C. Betts, Jason M. Horn
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Publication number: 20090031435Abstract: 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: ApplicationFiled: November 29, 2007Publication date: January 29, 2009Inventors: Brent R. Stockwell, David E. Root
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Patent number: 7295961Abstract: 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: GrantFiled: November 12, 2003Date of Patent: November 13, 2007Assignee: Agilent Technologies, Inc.Inventors: David E. Root, Nicholas B. Tuffilaro, John Wood, Jan Verspecht
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Publication number: 20040044063Abstract: 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: ApplicationFiled: June 2, 2003Publication date: March 4, 2004Inventors: Brent Stockwell, David E. Root
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Patent number: 5467291Abstract: 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: GrantFiled: December 5, 1991Date of Patent: November 14, 1995Assignee: Hewlett-Packard CompanyInventors: Siqi Fan, David E. Root, Jeffrey W. Meyer