Patents by Inventor Dan Popescu

Dan Popescu 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).

  • Publication number: 20250037874
    Abstract: Computer-implemented neural network techniques for predicting patient-specific arrhythmic sudden cardiac death survival are presented. The techniques can include obtaining cardiac image data for a patient; obtaining cardiac covariate data for the patient; providing the cardiac image data to a first subnetwork; providing the cardiac covariate data to a second subnetwork; combining an output from the first subnetwork with an output from the second subnetwork to produce survival probability data; and outputting patient-specific arrhythmic sudden cardiac death survival prediction data based on the survival probability data.
    Type: Application
    Filed: December 1, 2022
    Publication date: January 30, 2025
    Inventors: Natalia A. TRAYANOVA, Dan POPESCU, Mauro MAGGIONI, Julie K. SHADE
  • Publication number: 20240256875
    Abstract: A method includes receiving a plurality of inputs including domain parameters and initial weights. The method also includes providing the plurality of inputs to an optimization model. The method also includes performing, using a first layer of the optimization model, a training and optimization process based on the plurality of inputs and based on a training objective, The method also includes performing, using a second layer of the optimization model, a differencing operation on an output of the first layer. The method also includes recording, using a third layer of the optimization model, a loss based on the training objective used by the optimization model. The method also includes calculating and storing, using a fourth layer of the optimization model, metrics regarding the training and optimization process. The method also includes outputting, using the optimization model, updated weights.
    Type: Application
    Filed: January 26, 2023
    Publication date: August 1, 2024
    Inventors: Dan Popescu, Giovanni Faonte, Arthur Maghakian
  • Publication number: 20230394670
    Abstract: Fully automated computer-implemented deep learning techniques of contrast-enhanced cardiac MRI segmentation are provided. The techniques may include providing cardiac MRI data to a first computer-implemented deep learning network trained in order to identify a left ventricle region of interest to generate left ventricle region-of-interest-identified cardiac MRI data. The techniques may also include providing the left ventricle region-of-interest-identified cardiac MRI data to a second computer-implemented deep learning network trained in order to identify myocardium to generate myocardium-identified cardiac MRI data. The techniques may further include providing the myocardium-identified cardiac MRI data to at least one third computer-implemented deep learning network trained to conform data to geometrical anatomical constraints in order to generate anatomical-conforming myocardium-identified cardiac MRI data.
    Type: Application
    Filed: October 19, 2021
    Publication date: December 7, 2023
    Applicant: THE JOHNS HOPKINS UNIVERSITY
    Inventors: Natalia A. TRAYANOVA, Haley Gilbert ABRAMSON, Dan POPESCU, Mauro MAGGIONI, Katherine C. WU
  • Patent number: 10989531
    Abstract: Described herein is a method of setting-up a range-based tracking system utilising a tracking coordinate system that uses a plurality of spaced apart stationary nodes for tracking objects within a tracking environment. The method includes the step of transmitting signals between the stationary nodes to obtain range information between at least a subset of pairs of the nodes and determining coordinates for all of the stationary nodes in a node coordinate system using these range information. The method also includes the step of obtaining spatial information related to at least one of the nodes, the spatial information being indicative of one or more features or locations within the tracking environment and determining the location of all stationary nodes in the tracking coordinate system, wherein some or all of the coordinates of the stationary nodes are used for tracking objects in the tracking system.
    Type: Grant
    Filed: August 12, 2015
    Date of Patent: April 27, 2021
    Assignee: Commonwealth Scientific and Industrial Research Organisation
    Inventors: Mark Hedley, Dan Popescu
  • Publication number: 20170276480
    Abstract: Described herein is a method of setting-up a range-based tracking system utilising a tracking coordinate system that uses a plurality of spaced apart stationary nodes for tracking objects within a tracking environment. The method includes the step of transmitting signals between the stationary nodes to obtain range information between at least a subset of pairs of the nodes and determining coordinates for all of the stationary nodes in a node coordinate system using these range information. The method also includes the step of obtaining spatial information related to at least one of the nodes, the spatial information being indicative of one or more features or locations within the tracking environment and determining the location of all stationary nodes in the tracking coordinate system, wherein some or all of the coordinates of the stationary nodes are used for tracking objects in the tracking system.
    Type: Application
    Filed: August 12, 2015
    Publication date: September 28, 2017
    Inventors: Mark HEDLEY, Dan POPESCU
  • Publication number: 20170152634
    Abstract: An aluminum power transmission rail product comprises a profile main component made from molten aluminum onto which a stainless steel cap has been co-cast. Preferably, this main component has a locking feature such as a down-turn on at least one edge of the stainless steel cap. The rail product is preferably cast on a casting unit selected from the group consisting of a horizontal caster, a horizontal DC caster, an MDC caster and a semi-solid casting unit.
    Type: Application
    Filed: February 13, 2017
    Publication date: June 1, 2017
    Inventors: Edward P. Patrick, Dan Popescu
  • Patent number: 9566644
    Abstract: A method of manufacturing an aluminum power transmission rail product with a metallurgically bonded stainless steel cap comprises providing molten aluminum in a tundish; providing a roll formed stainless steel wear cap; pretreating and preheating the stainless steel cap, then introducing that cap into the tundish; co-casting the aluminum and cap through one or more dies; and tensioning the stainless steel cap at an exit of the casting die and rapidly cooling the same. An aluminum-stainless composite product is also disclosed.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: February 14, 2017
    Inventors: Edward P. Patrick, Dan Popescu
  • Publication number: 20160361762
    Abstract: A method of manufacturing an aluminum power transmission rail product with a metallurgically bonded stainless steel cap comprises providing molten aluminum in a tundish; providing a roll formed stainless steel wear cap; pretreating and preheating the stainless steel cap, then introducing that cap into the tundish; co-casting the aluminum and cap through one or more dies; and tensioning the stainless steel cap at an exit of the casting die and rapidly cooling the same. An aluminum-stainless composite product is also disclosed.
    Type: Application
    Filed: November 13, 2015
    Publication date: December 15, 2016
    Inventors: Edward P. Patrick, Dan Popescu
  • Patent number: 8587276
    Abstract: A controller for a power converter includes a first amplification stage and a second amplification stage coupled to the first amplification stage. The first amplification stage generates a first amplified signal at a first terminal of an energy storage element according to an output signal the power converter. The second amplification stage generates a second amplified signal at a second terminal of the energy storage element and varies the second amplified signal in response to a change in the output signal. The second amplification stage further decreases the variation of the second amplified signal based on the first amplified signal.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: November 19, 2013
    Assignee: O2Micro, Inc.
    Inventors: Laszlo Lipcsei, Serban Mihai Popescu, Vlad Mihail Dan Popescu-Stanesti
  • Publication number: 20120025792
    Abstract: A controller for a power converter includes a first amplification stage and a second amplification stage coupled to the first amplification stage. The first amplification stage generates a first amplified signal at a first terminal of an energy storage element according to an output signal the power converter. The second amplification stage generates a second amplified signal at a second terminal of the energy storage element and varies the second amplified signal in response to a change in the output signal. The second amplification stage further decreases the variation of the second amplified signal based on the first amplified signal.
    Type: Application
    Filed: May 2, 2011
    Publication date: February 2, 2012
    Applicant: O2MICRO, INC.
    Inventors: Laszlo LIPCSEI, Serban Mihai POPESCU, Vlad Mihail Dan POPESCU-STANESTI
  • Patent number: 8098469
    Abstract: An electronic system can include a switch and a regulator coupled to the switch. The switch can be used to deliver electricity from a first terminal to a second terminal. The switch can also be used to prevent the second terminal from having a level that is higher than a predefined operation level limit by controlling the status of the switch according to a supply signal at the first terminal. The regulator can be used to adjust a regulated signal at the second terminal according to the supply signal.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: January 17, 2012
    Assignee: O2Micro Inc.
    Inventors: Vlad Mihail Dan Popescu-Stanesti, Laszlo Lipcsei
  • Patent number: 8047337
    Abstract: A wheel brake for a vehicle including a brake disc unit adapted to brake the rotation of a rotation element, which is adapted to be drivingly connected to the wheel. The brake disc unit includes a first set of discs and a second set of discs arranged in an alternating manner in an axial direction. The discs in the first disc set are adapted to be rotationally rigidly connected to the rotation element. The brake disc unit includes at least one separator element, which is adapted to keep a sufficient distance between two adjacent discs of one of the disc sets for an intermediate disc from the other disc set to rotate at least substantially freely relative to the spaced discs when the brake disc unit is in a deactivated condition.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: November 1, 2011
    Assignee: Volvo Construction Equipment AB
    Inventors: Jonny Strandberg, Dan Popescu
  • Publication number: 20090262478
    Abstract: An electronic system can include a switch and a regulator coupled to the switch. The switch can be used to deliver electricity from a first terminal to a second terminal. The switch can also be used to prevent the second terminal from having a level that is higher than a predefined operation level limit by controlling the status of the switch according to a supply signal at the first terminal. The regulator can be used to adjust a regulated signal at the second terminal according to the supply signal.
    Type: Application
    Filed: April 3, 2009
    Publication date: October 22, 2009
    Inventors: Vlad Mihail Dan POPESCU-STANESTI, Laszlo LIPCSEI
  • Publication number: 20090101458
    Abstract: A wheel brake for a vehicle including a brake disc unit adapted to brake the rotation of a rotation element, which is adapted to be drivingly connected to the wheel . The brake disc unit includes a first set of discs and a second set of discs arranged in an alternating manner in an axial direction. The discs in the first disc set are adapted to be rotationally rigidly connected to the rotation element. The brake disc unit includes at least one separator element, which is adapted to keep a sufficient distance between two adjacent discs of one of the disc sets for an intermediate disc from the other disc set to rotate at least substantially freely relative to the spaced discs when the brake disc unit is in a deactivated condition.
    Type: Application
    Filed: April 28, 2006
    Publication date: April 23, 2009
    Applicant: Volvo Construction Equipment AB
    Inventors: Jonny Strandberg, Dan Popescu
  • Publication number: 20090040527
    Abstract: Interference measurements obtained by comparison of a same beam (i.e. same nominal polarization, intensity, coherence length and wavelength) striking a same region on a sample at a same angle, but having a different beam wavefront upon intersection with the region are shown to provide images with independent coherent speckle noise patterns. Accordingly a plurality of interference measurements with diverse beam wavefronts can be used to identify or reduce coherent speckle noise. Reduction of the coherent speckle noise can be performed by compounding the aligned images. A change in the beam wavefront may be provided by displacing the sample in the direction of the beam between or during the measurements, when the beam is a focused beam (i.e. converging or diverging).
    Type: Application
    Filed: July 15, 2008
    Publication date: February 12, 2009
    Inventors: Paul Dan Popescu, Michael G. Sowa, Mark D. Hewko