Patents by Inventor Angeliki Pantazi

Angeliki Pantazi 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: 20160267379
    Abstract: Method to produce a neuromorphic synapse apparatus comprising a memelement for storing a synaptic weight, and programming logic. The memelement is adapted to exhibit a desired programming characteristic. The programming logic is responsive to a stimulus prompting update of the synaptic weight for generating a programming signal for programming the memelement to update said weight. The programming logic may be responsive to an input signal indicating an input weight-change value ?Wi, and may be adapted to generate a programming signal dependent on the input weight-change value ?Wi. The programming logic is adapted such that the programming signals exploit the programming characteristic of the memelement to provide a desired weight-dependent synaptic update efficacy.
    Type: Application
    Filed: July 21, 2015
    Publication date: September 15, 2016
    Inventors: Evangelos S. Eleftheriou, Manuel Le Gallo, Angeliki Pantazi, Abu Sebastian, Tuma Tomas
  • Patent number: 9424869
    Abstract: Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: August 23, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Armando J. Argumedo, Nhan X. Bui, David H. Harper, Randy C. Inch, Kevin B. Judd, Mark A. Lantz, Angeliki Pantazi, Tomoko Taketomi
  • Patent number: 9390740
    Abstract: A storage device has a device body and a read/write head for reading and writing data in a data track of a storage medium. An actuator system is mounted on the device body for effecting movement of the read/write head relative to the data track to align the head with the data track. The actuator system has a plurality of degrees of freedom, and a controller controls the actuator system to effect the movement. A body vibration sensor provided on the device body generates a signal indicative of vibration of the body. An actuator vibration sensor generates a signal indicative of vibration of the actuator system. The controller is adapted to process the signals from the sensors to derive a coupling signal indicative of vibration coupling between the degrees of freedom, and to control the actuator system dependent on the coupling signal and the signal from the body vibration sensor.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: July 12, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Mark A. Lantz, Angeliki Pantazi
  • Publication number: 20160196845
    Abstract: A computer program product for positioning an actuator, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith. The computer readable storage medium is not a transitory signal per se. The program instructions are executable by a processing circuit to cause the processing circuit to perform a method that includes generating or receiving, by the processing circuit, a first value representative of a lateral position of a tape, and using, by the processing circuit, the first value to adjust a position of a coarse actuator for moving a magnetic head in response to determining that the first value is in a first range relative to a first threshold. An integrator value is used by the processing circuit to adjust the position of the coarse actuator in response to determining that the first value is in a second range relative to the first threshold.
    Type: Application
    Filed: March 10, 2016
    Publication date: July 7, 2016
    Inventors: Nhan X. Bui, Angeliki Pantazi, Tomoko Taketomi
  • Publication number: 20160153808
    Abstract: A sensor arrangement for position sensing comprises a magnetic field source and a magnetoresistive element arranged in a magnetic field generated by the magnetic field source, which magnetoresistive element provides an output signal (R) dependent on a position (x) of the magnetoresistive element relative to the magnetic field source. A feedback controller is configured to receive the output signal (R) of the magnetoresistive element and is configured to adjust one or more of the position (x) of the magnetoresistive element relative to the magnetic field source and a strength of the magnetic field generated by the magnetic field source acting on the magnetoresistive element dependent on the output signal (R) of the magnetoresistive element.
    Type: Application
    Filed: October 21, 2015
    Publication date: June 2, 2016
    Inventors: ANGELIKI PANTAZI, ABU SEBASTIAN, TOMAS TUMA
  • Publication number: 20160153809
    Abstract: A sensor arrangement for position sensing comprises a magnetic field source and a magnetoresistive element arranged in a magnetic field generated by the magnetic field source, which magnetoresistive element provides an output signal (R) dependent on a position (x) of the magnetoresistive element relative to the magnetic field source. A feedback controller is configured to receive the output signal (R) of the magnetoresistive element and is configured to adjust one or more of the position (x) of the magnetoresistive element relative to the magnetic field source and a strength of the magnetic field generated by the magnetic field source acting on the magnetoresistive element dependent on the output signal (R) of the magnetoresistive element.
    Type: Application
    Filed: December 14, 2015
    Publication date: June 2, 2016
    Inventors: ANGELIKI PANTAZI, ABU SEBASTIAN, TOMAS TUMA
  • Publication number: 20160125287
    Abstract: A neuromorphic synapse with a resistive memory cell connected in circuitry having first and second input terminals. The input terminals respectively receive pre-neuron and post-neuron action signals, each having a read portion and a write portion, in use. The circuitry includes an output terminal for providing a synaptic output signal which is dependent on resistance of the memory cell. The circuitry is configured such that the synaptic output signal is provided at the output terminal in response to application at the first input terminal of the read portion of the pre-neuron action signal, and such that a programming signal, for programming resistance of the memory cell, is applied to the cell in response to simultaneous application of the write portions of the pre-neuron and post-neuron action signals at the first and second input terminals respectively. The synapse can be adapted for operation with identical pre-neuron and post-neuron action signals.
    Type: Application
    Filed: September 29, 2015
    Publication date: May 5, 2016
    Inventors: ANGELIKI PANTAZI, ABU SEBASTIAN, EVANGELOS S. ELEFTHERIOU, TOMAS TUMA
  • Patent number: 9299373
    Abstract: A method according to one embodiment includes generating or receiving a value representative of a lateral position of a tape. The value is used to adjust a position of a coarse actuator in response to determining that the value is in a first range relative to a first threshold. An integrator center value is used to adjust the position of the coarse actuator in response to determining that the value is in a second range relative to the first threshold.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: March 29, 2016
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Angeliki Pantazi, Tomoko Taketomi
  • Publication number: 20150380033
    Abstract: A method according to one embodiment includes generating track following controller state information based on a positional signal of a head relative to a medium. One or more portions of the state information corresponding to particular frequencies are used to determine at least one of: lateral tape movement, tape skew, vibration operation conditions, and roller performance.
    Type: Application
    Filed: September 4, 2015
    Publication date: December 31, 2015
    Inventors: Nhan X. Bui, Angeliki Pantazi, Tomoko Taketomi
  • Patent number: 9218839
    Abstract: An apparatus for operating a tape storage device comprises a first tape skew determination unit for providing a first tape skew value concerning a skew of a tape in the tape storage device, and a second tape skew determination unit for providing a second tape skew value concerning the skew of the tape. An actuator adjusts one or more of a rotational orientation of a tape head of the tape storage device which tape head is provided for reading and/or writing data from/to the tape, and a motion direction of the tape dependent on the first tape skew value and the second tape skew value.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: December 22, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Giovanni Cherubini, Jens Jelitto, Angeliki Pantazi
  • Patent number: 9190088
    Abstract: A control system for aligning a first element coupled to an actuator with a second element of a main system includes a position sensor that measures an absolute position of the first element relative to the main system as a sensor signal, a position error signal-based compensator that generates a second control signal as a function of a position error signal, wherein the position error signal indicates a relative position of the first element as a difference between the actual position of the first element and a target position of the first element relative to the second element, a sensor-based compensator that generates a first control signal as a function of the sensor signal and the second control signal, and an actuator that changes the position of the first element relative to the second element dependent on the first control signal to align the first element with the second element.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: November 17, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Mark A. Lantz, Angeliki Pantazi, Tomas Tuma
  • Publication number: 20150310883
    Abstract: A storage device has a device body and a read/write head for reading and writing data in a data track of a storage medium. An actuator system is mounted on the device body for effecting movement of the read/write head relative to the data track to align the head with the data track. The actuator system has a plurality of degrees of freedom, and a controller controls the actuator system to effect the movement. A body vibration sensor provided on the device body generates a signal indicative of vibration of the body. An actuator vibration sensor generates a signal indicative of vibration of the actuator system. The controller is adapted to process the signals from the sensors to derive a coupling signal indicative of vibration coupling between the degrees of freedom, and to control the actuator system dependent on the coupling signal and the signal from the body vibration sensor.
    Type: Application
    Filed: July 1, 2015
    Publication date: October 29, 2015
    Inventors: Mark A. Lantz, Angeliki Pantazi
  • Publication number: 20150300840
    Abstract: A position sensor comprises a magneto-resistive element. The magneto-resistive element comprises a stack of layers including at least a conductive layer in between two magnetic layers. The layers have a longitudinal extension along a longitudinal axis and a lateral extension along a transverse axis. A magnet is provided comprising a magnetic dipole with a dipole axis orthogonal to a plane defined by the longitudinal axis and the transverse axis. The electrical resistance of the conductive layer depends on a position of the magnet along the longitudinal axis. The position sensor provides for nano-scale sensing.
    Type: Application
    Filed: November 8, 2013
    Publication date: October 22, 2015
    Applicant: International Business Machines Corporation
    Inventors: Walter E. M. Haeberle, Angeliki Pantazi, Abu Sebastian, Tomas Tuma
  • Patent number: 9159347
    Abstract: A method according to one embodiment includes generating track following controller state information based on a positional signal of a head relative to a medium. One or more portions of the state information corresponding to particular frequencies are used to determine at least one of: lateral tape movement, tape skew, vibration operation conditions, and roller performance.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: October 13, 2015
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Angeliki Pantazi, Tomoko Taketomi
  • Patent number: 9111563
    Abstract: A storage device has a device body and a read/write head for reading and writing data in a data track of a storage medium. An actuator system is mounted on the device body for effecting movement of the read/write head relative to the data track to align the head with the data track. The actuator system has a plurality of degrees of freedom, and a controller controls the actuator system to effect the movement. A body vibration sensor provided on the device body generates a signal indicative of vibration of the body. An actuator vibration sensor generates a signal indicative of vibration of the actuator system. The controller is adapted to process the signals from the sensors to derive a coupling signal indicative of vibration coupling between the degrees of freedom, and to control the actuator system dependent on the coupling signal and the signal from the body vibration sensor.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: August 18, 2015
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Lantz, Angeliki Pantazi
  • Patent number: 9087539
    Abstract: Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: July 21, 2015
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Armando J Argumedo, Nhan X Bui, David H Harper, Randy C Inch, Kevin B Judd, Mark A Lantz, Angeliki Pantazi, Tomoko Taketomi
  • Publication number: 20150199986
    Abstract: A method according to one embodiment includes generating or receiving a value representative of a lateral position of a tape. The value is used to adjust a position of a coarse actuator in response to determining that the value is in a first range relative to a first threshold. An integrator center value is used to adjust the position of the coarse actuator in response to determining that the value is in a second range relative to the first threshold.
    Type: Application
    Filed: March 3, 2015
    Publication date: July 16, 2015
    Inventors: Nhan X. Bui, Angeliki Pantazi, Tomoko Taketomi
  • Patent number: 9070438
    Abstract: Methods and apparatus are provided for programming a phase-change memory cell having s>2 programmable cell states. At least one control signal is applied to produce a programming pulse for programming the cell. At least one control signal is varied during the programming pulse to shape the programming pulse in dependence on the cell state to be programmed and produce a selected one of a plurality of programming pulse waveforms corresponding to respective programming trajectories for programming the cell states. The selected programming pulse waveform corresponds to a programming trajectory containing the cell state to be programmed.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: June 30, 2015
    Assignee: International Business Machines Corporation
    Inventors: Angeliki Pantazi, Nikolaos Papandreou, Charalampos Pozidis, Abu Sebastian
  • Patent number: 9064571
    Abstract: A method is provided that comprises a step of programming the PCM cell to have a respective definite cell state by at least one current pulse flowing to the PCM cell, said respective definite cell state being defined at least by a respective definite resistance level, a step of controlling said respective current pulse by a respective bitline pulse and a respective wordline pulse, and a step of controlling said respective bitline pulse and said respective wordline pulse dependent on an actual resistance value of the PCM cell and a respective reference resistance value being defined for the definite resistance level.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: June 23, 2015
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Evangelos S. Eleftheriou, Angeliki Pantazi, Nikolaos Papandreou, Haris Pozidis, Abu Sebastian
  • Publication number: 20150131180
    Abstract: An apparatus for operating a tape storage device comprises a first tape skew determination unit for providing a first tape skew value concerning a skew of a tape in the tape storage device, and a second tape skew determination unit for providing a second tape skew value concerning the skew of the tape. An actuator adjusts one or more of a rotational orientation of a tape head of the tape storage device which tape head is provided for reading and/or writing data from/to the tape, and a motion direction of the tape dependent on the first tape skew value and the second tape skew value.
    Type: Application
    Filed: April 24, 2013
    Publication date: May 14, 2015
    Inventors: Giovanni Cherubini, Jens Jelitto, Angeliki Pantazi