Jie E Yu

age ~44

from Los Angeles, CA

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Jie Yu Phones & Addresses

1636 Lucretia Ave, Los Angeles, CA 90026 • (213)3950725
1800 Winona Blvd, Los Angeles, CA 90027
Valencia, CA

Us Patents

Method Of Tuning Feed-Forward Control In A Disk Drive
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US Patent:

6636377, Oct 21, 2003
Filed:

Jun 30, 2000
Appl. No.:

09/608573
Inventors:

Jie Yu - Irvine CA
David B. Joan - Trabuco Canyon CA
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5596
US Classification:

360 7807, 360 7808, 360 7806, 360 7809
Abstract:

A method of tuning a servo control system in a disk drive that implements seeks using a the feed-forward command effort signal u and a PES reference signal r that were designed to be compatible with one another on the basis of a modeled frequency response G (z) that is different from an actual frequency response G(z). The steps includes scaling the feed-forward command effort signal u to substantially achieve a zero velocity condition at an end of the seek; scaling the feed-forward command effort signal u to substantially achieve an on-target condition at the end of the seek; and modifying the PES reference signal r such that it substantially varies in unison with the indicated PES signal y during the seek.

Disk Drive Modifying A Rotational Position Optimization Algorithm Based On Motor Capability Of A Vcm
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US Patent:

6987639, Jan 17, 2006
Filed:

Sep 30, 2003
Appl. No.:

10/676578
Inventors:

Jie Yu - Irvine CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5/55
US Classification:

360 7804, 360 7809, 710 39, 711112, 711167
Abstract:

A disk drive is disclosed comprising a disk, a head, and a voice coil motor (VCM) for actuating the head over the disk. The disk drive executes a rotational position optimization (RPO) algorithm to select a next command to execute relative to an estimated seek time computed for each command in a command queue. A motor capability of the VCM is estimated and used to modify the estimated seek time for each command in the command queue to thereby optimize the RPO algorithm.

Internal Disk Drive Temperature Estimation
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US Patent:

7050254, May 23, 2006
Filed:

Feb 11, 2005
Appl. No.:

11/056201
Inventors:

Jie Yu - Irvine CA, US
Hasnorhafiza Husni - Selangor, MY
Jian Chen - Irvine CA, US
Hong Wan Tham - Selangor, MY
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5/02
US Classification:

360 55
Abstract:

Disclosed is a disk drive that provides for internal disk drive temperature estimation. The disk drive includes an actuator, a head attached to the actuator, a disk to store data, a preamplifier connected to the head to amplify read and write signals, and a processor for controlling operations in the disk drive including moving the actuator such that the head is moved to read data from and write data to the disk. The processor under the control of a program is further utilized to calculate a junction temperature (J) based on a breakthrough voltage of the preamplifier, apply a filter to the calculated Jto compensate for temperature noise, and to estimate an internal disk drive temperature based upon the filtered J.

Disk Drive Employing Asymmetric Acceleration/Deceleration Pulses For Acoustic Noise Reduction During Unlatch
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US Patent:

7054098, May 30, 2006
Filed:

Jun 1, 2004
Appl. No.:

10/860339
Inventors:

Jie Yu - Irvine CA, US
David D. Nguyen - Fountain Valley CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5/596
US Classification:

360 7806, 360 7804
Abstract:

A disk drive is disclosed comprising a disk, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot to actuate the head over the disk, wherein the VCM rotates the actuator arm into a latched positioned when the disk drive is idle. Disk drive control circuitry unlatches the actuator arm by applying a driving current to the VCM according to an open-loop current profile. The open-loop current profile comprises an acceleration pulse having an acceleration magnitude and an acceleration interval, and a deceleration pulse having a deceleration magnitude and a deceleration interval. The deceleration magnitude is substantially smaller than the acceleration magnitude, and the deceleration interval is substantially longer than the acceleration interval, to thereby attenuate acoustic noise when unlatching the actuator arm.

Disk Drive Modifying Estimated Seek Times For A Rotational Position Optimization Algorithm Based On Change In Estimated Seek Time Parameter
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US Patent:

7061714, Jun 13, 2006
Filed:

Dec 19, 2003
Appl. No.:

10/741785
Inventors:

Jie Yu - Irvine CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5/596
US Classification:

360 7807, 360 7808, 711111, 318560, 318632
Abstract:

A disk drive is disclosed comprising a disk, a head, and a voice coil motor (VCM) for actuating the head over the disk. The disk drive executes a rotational position optimization (RPO) algorithm to select a next command to execute relative to an estimated seek time computed for each command in a command queue. A seek time parameter is estimated and a seek time delta computed in response to the estimated seek time parameter. The seek time delta is added to a nominal estimated seek time to generate a modified estimated seek time for each command in the command queue, thereby optimizing the RPO algorithm.

System And Method For Writing Servo Sectors In A Perpendicular Media Recording Environment
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US Patent:

7388728, Jun 17, 2008
Filed:

Sep 22, 2006
Appl. No.:

11/525411
Inventors:

Teddy T. C. Chen - Huntington Beach CA, US
Jinsheng Bill Jang - Irvine CA, US
Jie Yu - Irvine CA, US
Masao Miyamura - Diamond Bar CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 5/596
US Classification:

360 7708
Abstract:

A perpendicular media recording (PMR) servo track writer (STW) system and method for writing servo sectors onto a disk is disclosed. The servo writer includes a head positioner to position a head of a head disk assembly (HDA) relative to a disk, wherein the head writes servo sectors onto the disk with a perpendicular flux. The servo writer includes a controller to control the head positioner such that the head writes servo sectors onto the disk from one of an inner diameter (ID) or an outer diameter (OD) of the disk to a middle diameter (MD) of the disk, respectively, followed by writing servo sectors between the other of the OD or the ID of the disk to the MD of the disk, respectively.

Disk Drive Operable With First And Second Servo Patterns In A Perpendicular Media Recording Environment
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US Patent:

7466509, Dec 16, 2008
Filed:

Sep 22, 2006
Appl. No.:

11/525406
Inventors:

Teddy T. C. Chen - Huntington Beach CA, US
Jinsheng Bill Jang - Irvine CA, US
Jie Yu - Irvine CA, US
Jonathan V Nguyen - Laguna Niguel CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 21/02
US Classification:

360 75
Abstract:

A disk drive operable with first and second servo patterns in a perpendicular media recording (PMR) environment is disclosed. The disk drive comprises a head operable with a perpendicular flux, a disk, and a servo controller. The disk includes a plurality of tracks, wherein each track has a plurality of servo sectors utilized in seek operations. The servo sectors of the disk include a first servo pattern between one of an inner diameter (ID) or an outer diameter (OD) of the disk and a middle diameter (MD) of the disk, respectively, and a second servo pattern between the other of the OD or the ID of the disk and the MD of the disk, respectively. The servo controller operates in a first mode when seeking within one of the first or second servo patterns and a second mode when seeking between the first servo pattern and the second servo pattern.

Disk Drive Rewriting Servo Sectors By Writing And Servoing Off Of Temporary Servo Data Written In Data Sectors
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US Patent:

7518819, Apr 14, 2009
Filed:

Aug 31, 2007
Appl. No.:

11/849029
Inventors:

Jie Yu - Irvine CA, US
Guoxiao Guo - Foothill Ranch CA, US
Jack M. Chue - Los Altos CA, US
Assignee:

Western Digital Technologies, Inc. - Lake Forest CA
International Classification:

G11B 21/02
G11B 27/36
US Classification:

360 75, 360 31, 360 7708, 360 7814
Abstract:

A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises a head actuated over the disk, the head comprising a read element radially offset from a write element by a reader/writer offset. In order to rewrite a marginal servo sector detected in a target track, control circuitry within the disk drive relocates user data recorded in a first data sector of a near adjacent track to a staging memory. Servo data is written over the first data sector, and the read element is used to read the servo data written over the first data sector to actuate the head to rewrite the marginal servo sector of the target track. The user data stored in the staging memory is then rewritten to the first data sector.

Resumes

Jie Yu Riverside, CA

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Work:

Nano Device Lab

Sep 2008 to 2000
Graduate Student Researcher Siemens PLM software
Cypress, CA
Jun 2011 to Sep 2011
Intern Engineer Chinese Academy of Sciences, Shanghai, China

Oct 2007 to May 2008
Work as project manager assistant

Education:

University of California
Riverside, CA
Mar 2012
Ph.D in Electrical Engineering University of California
Riverside, CA
Mar 2012
M.S. in Computer Science University of California
Riverside, CA
Jun 2009
M.S. in Electrical Engineering Huazhong University of Sci. and Tech
Jun 2007
B.S. in Electrical and Electronic Engineering

Skills:

Semiconductor Fabrication Skills: Scanning Electron Microscopy (SEM) (XL30-FEG Philips), E-Beam Lithography (EBL) (Leo 1550), E Beam Evaporator (Temescal BJD-1800), Focused Ion Beam (FIB) (Leo XB1540), Deep Reactive Ion Etching (RIE) (STS Multiplex RIE), Photolithography Processing (Karl Suss MA6 & Quintel Q-4000 series).,Chemical Vapor Deposition (Unaxis PECVD &LPCVD), Atomic Layer Deposition (ALD) (Cambridge Nanotech), Rapid Thermal Annealer (MPT 600S), Wet Bench, Spin coater. Characterization: I-V, C-V Characterizer (Agilent 4284), Raman spectroscopy (Renishaw RM 2000, Horiba), Atomic force microscopy (AFM) (Veeco Dimension5000), 1/f noise Spectral Analyzer (SR-785).Energy Dispersive Analysis using X-rays (EDX). Thermal management Measurement (Laser Flash-LFA 447, Hot disc Technique) Software: TCAD Sentaurus, COMSOL, Cadence Virtuoso, Rhino, Origin. Cadence/Synopsys, Quartus/Modelsim, PSPICE Programming: C/C++, Verilog / VHDL, MATLAB, Perl, JAVA Scripts

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Phones & Addresses

Jie Yu
Principal

New Life Therapy
Misc Personal Services

1027 W Ave J, Lancaster, CA 93534