Patents by Inventor Wonkyu Moon

Wonkyu Moon 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: 8946974
    Abstract: Piezoelectric fibers include a polypeptide wherein molecules of the polypeptide have electric dipole moments that are aligned such that the piezoelectric fiber provides a piezoelectric effect at an operating temperature. A piezoelectric component provides a plurality of piezoelectric fibers, each comprising an organic polymer. A method of producing piezoelectric fibers includes electrospinning a polymer solution to form a fiber and winding the fiber onto a rotating target in which the rotating target is electrically grounded. An acoustic sensor includes a plurality acoustic transducers, wherein the plurality of acoustic transducers are structured and arranged to detect a corresponding plurality of vector components of an acoustic signal, and at least one of the plurality of acoustic transducers comprises a piezoelectric fiber.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: February 3, 2015
    Assignee: The Johns Hopkins University
    Inventors: Michael Yu, Dawnielle Farrar, Wonkyu Moon, James West, Sangkyu Lee
  • Patent number: 8644115
    Abstract: A sound sensor, a hydrophone including the sound sensor, and a pressure balancing device for using for the hydrophone are provided. The hydrophone includes: a sensor including a sensing part and a pressure balancing part; a printed circuit board (PCB) that is electrically connected to the sensor; a case that houses the sensor and the PCB and that has an opening at one side thereof; an elastic membrane that covers the opening of the case; and a signal line that is electrically connected to the PCB to be extended to the outside of the case. The pressure balancing part includes a diaphragm of a thin film and a support that supports the diaphragm. A pressure balancing hole is formed at one side of the pressure balancing part, and at the inside of the pressure balancing part, a channel that is connected to the pressure balancing hole is formed, and a compressible gas is filled in the channel.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: February 4, 2014
    Assignee: Postech Academy-Industry Foundation
    Inventors: Wonkyu Moon, Haksue Lee, Sungjoon Choi
  • Patent number: 8242791
    Abstract: An area-variable type capacitive displacement sensor includes: a stationary element; a movable element; an elastic member for providing a force biasing one of the stationary element and the movable member towards a remaining one thereof in a direction perpendicular to a driving direction so that the stationary element and the movable member are maintained in close contact with each other; a power supply; and a signal detecting circuit. The sensor further includes a guide means for correcting an initial alignment error and reducing an operation alignment error between the stationary element and the movable element.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: August 14, 2012
    Assignee: Postech Academy-Industry Foundation
    Inventors: Daesil Kang, Wonkyu Moon
  • Publication number: 20120170422
    Abstract: A sound sensor, a hydrophone including the sound sensor, and a pressure balancing device for using for the hydrophone are provided. The hydrophone includes: a sensor including a sensing part and a pressure balancing part; a printed circuit board (PCB) that is electrically connected to the sensor; a case that houses the sensor and the PCB and that has an opening at one side thereof; an elastic membrane that covers the opening of the case; and a signal line that is electrically connected to the PCB to be extended to the outside of the case. The pressure balancing part includes a diaphragm of a thin film and a support that supports the diaphragm. A pressure balancing hole is formed at one side of the pressure balancing part, and at the inside of the pressure balancing part, a channel that is connected to the pressure balancing hole is formed, and a compressible gas is filled in the channel.
    Type: Application
    Filed: January 4, 2011
    Publication date: July 5, 2012
    Applicant: POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Wonkyu MOON, Haksue Lee, Sungjoon Choi
  • Publication number: 20110260584
    Abstract: Piezoelectric fibers include a polypeptide wherein molecules of the polypeptide have electric dipole moments that are aligned such that the piezoelectric fiber provides a piezoelectric effect at an operating temperature. A piezoelectric component provides a plurality of piezoelectric fibers, each comprising an organic polymer. A method of producing piezoelectric fibers includes electrospinning a polymer solution to form a fiber and winding the fiber onto a rotating target in which the rotating target is electrically grounded. An acoustic sensor includes a plurality acoustic transducers, wherein the plurality of acoustic transducers are structured and arranged to detect a corresponding plurality of vector components of an acoustic signal, and at least one of the plurality of acoustic transducers comprises a piezoelectric fiber.
    Type: Application
    Filed: August 19, 2009
    Publication date: October 27, 2011
    Inventors: Michael Yu, Dawnielle Farrar, Wonkyu Moon, James West, Sangkyu Lee
  • Publication number: 20090289641
    Abstract: An area-variable type capacitive displacement sensor includes: a stationary element; a movable element; an elastic member for providing a force biasing one of the stationary element and the movable member towards a remaining one thereof in a direction perpendicular to a driving direction so that the stationary element and the movable member are maintained in close contact with each other; a power supply; and a signal detecting circuit. The sensor further includes a guide means for correcting an initial alignment error and reducing an operation alignment error between the stationary element and the movable element.
    Type: Application
    Filed: May 20, 2009
    Publication date: November 26, 2009
    Applicant: POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Daesil Kang, Wonkyu Moon
  • Patent number: 7460439
    Abstract: A multiple resonances type ultrasonic transducer for a ranging measurement with high directionality using a parametric transmitting array in air, includes an ultrasonic actuator unit formed with a regularly mixing array of first unit actuators having a resonance frequency of f1 and second unit actuators having a resonance frequency of f2. The ultrasonic actuator unit generates a difference frequency wave (fd=f1?f2) with high directionality by forming a parametric transmitting array in air through generating two ultrasonic waves with high pressure in air. Further, the transducer includes an ultrasonic sensor unit formed with one or more unit sensors having a resonance frequency of the difference frequency (fd=f1?f2), for sensing a reflected ultrasonic pulse signal from a target.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: December 2, 2008
    Assignees: Postech Foundation, Postech Academy Industry Foundation
    Inventors: Wonkyu Moon, Haksue Lee
  • Patent number: 7402736
    Abstract: A probe of a scanning probe microscope having a sharp tip and an increased electric characteristic by fabricating a planar type of field effect transistor and manufacturing a conductive carbon nanotube on the planar type field effect transistor. To achieve this, the present invention provides a method for fabricating a probe having a field effect transistor channel structure including fabricating a field effect transistor, making preparations for growing a carbon nanotube at a top portion of a gate electrode of the field effect transistor, and generating the carbon nanotube at the top portion of the gate electrode of the field effect transistor.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: July 22, 2008
    Assignee: POSTECH Foundation
    Inventors: Wonkyu Moon, Geunbae Lim, Sang Hoon Lee
  • Patent number: 7347102
    Abstract: A contact-type electric capacitive displacement sensor includes a stationary element having a stationary plate, a stationary conductive pattern formed on the stationary plate and an insulation film coated on the stationary plate and a displaceable element having a displaceable plate, a displaceable conductive pattern formed on the displaceable plate and an insulation film coated on the displaceable plate. The stationary and the displaceable conductive patterns have a cyclic pattern of conductor to thereby produce a variation of capacitance therebetween when moving relative to each other.
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: March 25, 2008
    Assignees: Postech Foundation, Postech Academy-Industry Foundation
    Inventors: Wonkyu Moon, Moojin Kim
  • Publication number: 20080013405
    Abstract: A multiple resonances type ultrasonic transducer for a ranging measurement with high directionality using a parametric transmitting array in air, includes an ultrasonic actuator unit formed with a regularly mixing array of first unit actuators having a resonance frequency of f1 and second unit actuators having a resonance frequency of f2. The ultrasonic actuator unit generates a difference frequency wave (fd=f1?f2) with high directionality by forming a parametric transmitting array in air through generating two ultrasonic waves with high pressure in air. Further, the transducer includes an ultrasonic sensor unit formed with one or more unit sensors having a resonance frequency of the difference frequency (fd=f1?f2), for sensing a reflected ultrasonic pulse'signal from a target.
    Type: Application
    Filed: September 28, 2006
    Publication date: January 17, 2008
    Applicants: POSTECH FOUNDATION, POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Wonkyu Moon, Haksue Lee
  • Patent number: 7196970
    Abstract: An ultrasonic ranging method for measuring a distance to an object in an air includes the steps of generating a first and a second primary ultrasonic waves having a frequency f1 and f2, respectively, transmitting the first and the second primary ultrasonic waves in a same direction, wherein a secondary ultrasonic wave having a frequency corresponding to the difference of two frequencies fd=f1?f2 is created by a nonlinear property of the air and radiated to the object, detecting an echo pulse of the secondary ultrasonic wave reflected from the object, and measuring the distance to the object based on a propagation time of the secondary wave.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: March 27, 2007
    Assignee: Postech Foundation
    Inventors: Wonkyu Moon, Haksue Lee
  • Publication number: 20070034013
    Abstract: A contact-type electric capacitive displacement sensor includes a stationary element having a stationary plate, a stationary conductive pattern formed on the stationary plate and an insulation film coated on the stationary plate and a displaceable element having a displaceable plate, a displaceable conductive pattern formed on the displaceable plate and an insulation film coated on the displaceable plate. The stationary and the displaceable conductive patterns have a cyclic pattern of conductor to thereby produce a variation of capacitance therebetween when moving relative to each other.
    Type: Application
    Filed: August 10, 2005
    Publication date: February 15, 2007
    Applicants: POSTECH FOUNDATION, POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Wonkyu Moon, Moojin Kim
  • Publication number: 20060230475
    Abstract: Disclosed is a probe of a scanning probe microscope having a sharp tip and an increased electric characteristic by fabricating a planar type of field effect transistor and manufacturing a conductive carbon nanotube on the planar type field effect transistor. To achieve this, the present invention provides a method for fabricating a probe having a field effect transistor channel structure including fabricating a field effect transistor, making preparations for growing a carbon nanotube at a top portion of a gate electrode of the field effect transistor, and generating the carbon nanotube at the top portion of the gate electrode of the field effect transistor.
    Type: Application
    Filed: December 23, 2005
    Publication date: October 12, 2006
    Applicant: POSTECH FOUNDATION
    Inventors: Wonkyu Moon, Geunbae Lim, Sang Lee
  • Patent number: 6996495
    Abstract: A capacitive motion sensor includes a primary plate including a primary pattern replicated periodically, a secondary plate including a plurality of pattern regions with an insulated region inserted there between, wherein each of the pattern regions has a secondary pattern replicated periodically, a signal source for sending a plate input signal to the primary plate, and a displacement measuring unit for receiving a plurality of plate output signals from the secondary plate to measure a displacement of a moving one of the plates with respect to the other one of the plates. The primary plate is arranged in parallel with the secondary plate in such a manner that the primary pattern is confronted with the secondary pattern and the pattern regions of the secondary plate are arranged in a two-dimensional array.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: February 7, 2006
    Assignee: POSTECH Foundation
    Inventors: Moojin Kim, Wonkyu Moon, Wankyun Chung
  • Publication number: 20050276163
    Abstract: An ultrasonic ranging method for measuring a distance to an object in an air includes the steps of generating a first and a second primary ultrasonic waves having a frequency f1 and f2, respectively, transmitting the first and the second primary ultrasonic waves in a same direction, wherein a secondary ultrasonic wave having a frequency corresponding to the difference of two frequencies fd=f1?f2 is created by a nonlinear property of the air and radiated to the object, detecting an echo pulse of the secondary ultrasonic wave reflected from the object, and measuring the distance to the object based on a propagation time of the secondary wave.
    Type: Application
    Filed: October 8, 2004
    Publication date: December 15, 2005
    Applicant: POSTECH FOUNDATION
    Inventors: Wonkyu Moon, Haksue Lee
  • Publication number: 20040124999
    Abstract: A capacitive motion sensor includes a primary plate including a primary pattern replicated periodically, a secondary plate including a plurality of pattern regions with an insulated region inserted therebetween, wherein each of the pattern regions has a secondary pattern replicated periodically, a signal source for sending a plate input signal to the primary plate, and a displacement measuring unit for receiving a plurality of plate output signals from the secondary plate to measure a displacement of a moving one of the plates with respect to the other one of the plates.
    Type: Application
    Filed: December 18, 2003
    Publication date: July 1, 2004
    Applicant: POSTECH FOUNDATION
    Inventors: Moojin Kim, Wonkyu Moon, Wankyun Chung