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Zhi G Wang

from San Jose, CA
Age ~76
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Also known as:
Zhi Hong Wang, Gang Z Wang
Related to:
Ru Wang Dei, 58Yong Wang, 56Dilan Wang, 70Jia Liu, 53Pei Ing Hwang, 71Yan L WangMao P WangKuo H Wang, 74Ren Wang, 42Pi H Hsu, 63Tianxu Wang, 40Hai Qiang Wang, 42Yujun Wang, 54Xue Wang, 41John P Wang, 37Xiyang Wang, 38Chengyong Wang, 48Yuchun Ge, 63Pao F Wang, 48Qiang Wang, 55Junna Wang, 41
Connected to:
Adele R Wang, 107Aiyuan Wang, 52Akiet Wang, 74Alene P Wang, 52Amanda K Wang, 46Amei Wang, 61Amity H Wang, 70Amy Wang, 59Anastasia S Wang, 85Ange Wang, 35

Zhi Wang Phones & Addresses

  • San Jose, CA
  • Sunnyvale, CA
  • Cupertino, CA
  • Monterey Park, CA
  • Los Gatos, CA

Resumes

Resumes

Zhi Wang Photo 1

Cad And Pcb Design Engineer

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Location:
San Francisco, CA
Industry:
Consumer Electronics
Work:
Google
Cad and Pcb Design Engineer
Microsoft May 2016 - Apr 2017
Pcb Design Engineer
Hikvision Jul 2007 - Jul 2015
Senior Pcb Design Engineer, Team Leader
Education:
Zhejiang University 2010 - 2015
Masters, Communication, Engineering Xi'an Technological University 2003 - 2007
Bachelors, Information Science
Skills:
Cam350
Circuit Knowledge
Pcb Manufacturing Process
Familiar With Valor
High Current Pcb
Pcb Materials
Thick Copper Pcb
Aluminum Base
Create Pcb Footprints
Rf Pcb
Si/Pi Simulate Methods
Rigid Flex Pcb
Hdi
Led Pcb
Power Supplies Pcb
High Speed Pcb
Fpc
Output Gerber and Odb+ Files
Ipc Standards
Cadence 16.6
Si9000
Digital&Analog Pcb
Zwcad
Multi Layer Pcb
High Voltage Pcb
Impedance Calculate
Pcb Stackup
Languages:
Chinese
English
Mandarin
Zhi Wang Photo 2

Senior Staff R And D Engineer

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Location:
San Francisco, CA
Industry:
Electrical/Electronic Manufacturing
Work:
Hgst, A Western Digital Company Dec 2011 - Sep 2014
Servo Team Lead
Toshiba America Electronic Components, Inc. Dec 2011 - Sep 2014
Senior Staff R and D Engineer
Samsung Jun 2010 - Dec 2011
Senior Staff Engineer
Hgst, A Western Digital Company Oct 2007 - Jun 2010
Servo Engineer
Western Digital Feb 2001 - Sep 2007
Servo Engineer
Education:
Tongji University
New York University - Polytechnic School of Engineering
Skills:
Hard Drives
Firmware
Embedded Systems
Arm
Failure Analysis
Servo
Sata
Debugging
Simulations
C
Embedded Software
Semiconductors
Design of Experiments
Matlab
R&D
Engineering Management
Arm Architecture
Research and Development
Zhi Wang Photo 3

Zhi Wang

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Zhi Wang Photo 4

Zhi Wang

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Zhi Wang Photo 5

Zhi Wang

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Zhi Wang Photo 6

Zhi Wang

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Zhi Wang Photo 7

Zhi Wang

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Zhi Wang Photo 8

Zhi Wang

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Location:
United States

Business Records

Name / Title
Company / Classification
Phones & Addresses
Zhi Hong Wang
President
MANDARIN CHINESE FOOD & SUSHI
524 E San Bernadino Rd, Covina, CA 91723
745 E Garvey Ave, Monterey Park, CA 91755
524 E San Bernardino Rd, Covina, CA 91723
Zhi He Wang
President
US SHEN ZHOU INTERNATIONAL INC
227 W Vly Bl #218B, San Gabriel, CA 91776
227 W Vly Blvd, San Gabriel, CA 91776
Zhi Bin Wang
President
Cornerstone World Business, Inc
Nonclassifiable Establishments
1650 Zanker Rd, San Jose, CA 95112
3812 Sebastopol Rd, Santa Rosa, CA 95407
(707) 528-9700
Zhi H. Wang
Principal
Hua Hong
Mfg Cutlery · Nonclassifiable Establishments
6875 Ln Palma Ave, Buena Park, CA 90620
Zhi F. Wang
Principal
San Dragon US Int L Inc
Nonclassifiable Establishments
14755 Salt Lk Ave, Whittier, CA 91746
Zhi Hong Wang
Principal
Mandarin Cheese Food & Sushi
Eating Place
524 E San Bernardino Rd, Covina, CA 91723
(626) 966-3888
Zhi Wang
M
Stardust Apartment Reno LLC
1301 Stardust St, Reno, NV 89503
42003 Via, Fremont, CA 94539
152 Gamma Grass Ter, Fremont, CA 94539
22861 Medina Ln, Cupertino, CA 95014
Zhi Hui Wang
Carenet USA International Investment LLC
20425 E Peach Blossom Rd, Walnut, CA 91789

Publications

Us Patents

Performance Of A Rotary Actuator In A Disk Drive

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US Patent:
6903897, Jun 7, 2005
Filed:
Jun 27, 2003
Appl. No.:
10/607710
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B005/596
US Classification:
360 7807, 360 7806, 360 7702, 318561, 318632
Abstract:
A method for improving the performance of a rotary actuator in a disk drive, the rotary actuator comprises a voice coil motor (VCM) characterized by a torque parameter, the disk drive comprises a servo control system having a motor driver circuit for receiving a series of command effort signals (CEFs) transmitted based on a first seek profile, and for providing an operating current to VCM based on the CEFs for causing a movement of the actuator from a first radial location to a target radial location. The method includes recording the transmitted CEFs, and while actuator is moving: adjusting each recorded CEF to account for a disk drive influence on actuator movement; storing adjusted CEFs; monitoring velocity of moving actuator; calculating an acceleration value corresponding to moving actuator from the stored CEFs and monitored velocity; and adjusting the acceleration value to account for a radial torque parameter variation.

Disk Drive Employing Wedge Spindle Speed Control With Eccentricity Compensation

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US Patent:
6972540, Dec 6, 2005
Filed:
Nov 19, 2004
Appl. No.:
10/993077
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
David Dung Tien Nguyen - Fountain Valley CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
H02P005/00
G11B021/02
US Classification:
318650, 318560, 318561, 318254, 318268, 360 75, 360 7708, 360 7812
Abstract:
A disk drive is disclosed wherein a BEMF speed error is measured during a BEMF spindle speed control mode, and a spindle control current is updated in response to the BEMF speed error to drive the disk at an operating speed. A reference time period (RTP) is calibrated, and a sinusoidal error in a wedge time period (WTP) due to eccentricity in the disk rotating is estimated to generate an eccentricity compensation value. After switching to a wedge spindle speed control mode, an actual WTP is detected and a wedge speed error is generated in response to the RTP, the detected actual WTP, and the eccentricity compensation value. The disk is then maintained at the operating speed by updating the spindle control current in response to the wedge speed error.

Method For Iteratively Determining Repeatable Runout Cancellation Values In A Magnetic Disk Drive

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US Patent:
6999267, Feb 14, 2006
Filed:
Apr 28, 2004
Appl. No.:
10/835446
Inventors:
Hemant Melkote - San Jose CA, US
Zhi Wang - San Jose CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/596
US Classification:
360 7704
Abstract:
The present invention may be embodied in a method of determining a repeatable runout (RRO) compensation value set for a data track on a magnetic disk in a disk drive. The track comprises a plurality of embedded sectors that define a circumferential path having RRO requiring compensation during data read and write operation. In the method, track following is performed along the track and a position error signal (PES) is determined for each servo sector. An RRO compensation value is iteratively learned for each servo sector using the previously learned value for the servo sector and using the PES for the servo sector and for adjacent servo sectors.

Disk Drive Estimating A Sinusoidal Error In A Wedge Time Period Due To Eccentricity In Disk Rotation

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US Patent:
7068451, Jun 27, 2006
Filed:
Nov 16, 2004
Appl. No.:
10/989674
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
David Dung Tien Nguyen - Fountain Valley CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/09
US Classification:
360 51, 360 25
Abstract:
A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to:EST_WTP=RTP+*cos(2π)+*sin(2π)wherein RTP is a reference time period corresponding to a nominal WTP, k is an index representing a servo wedge, and {â,{circumflex over (b)}} are adjustable coefficients. A wedge time error e(k) is estimated as the difference between the estimated WTP and a detected actual WTP. The coefficients {â,{circumflex over (b)}} for generating the estimated WTP are adjusted according to:(+1)=()−()*cos(2π){circumflex over (b)}(k+1)={circumflex over (b)}(k)−G*e(k)*sin(2πk/N)wherein G is a predetermined gain.

Disk Drive Recursively Estimating Repeatable Runout

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US Patent:
7088547, Aug 8, 2006
Filed:
Jul 25, 2005
Appl. No.:
11/188914
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/596
US Classification:
360 7704
Abstract:
A disk drive is disclosed comprising control circuitry for generating a control signal applied to a VCM in response to a position error signal (PES) generated from reading embedded servo sectors and a feed-forward compensation value that compensates for a repeatable runout (RRO) disturbance. The feed-forward compensation value is generated for each servo sector in response to an RRO estimate Ŝ computed recursively for each servo sector according to:.

Disk Drive To Characterize Misaligned Servo Wedges

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US Patent:
7212374, May 1, 2007
Filed:
Oct 14, 2005
Appl. No.:
11/250649
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
Chun Sei Tsai - Tustin CA, US
Carl E. Barlow - Lake Forest CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/596
G11B 21/02
US Classification:
360 7814, 360 7804
Abstract:
Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein the servo wedges may be misaligned relative to the head of the disk drive that moves about a pivot. A servo controller is used to characterize the misaligned servo wedges relative to the head during a seek operation by implementing the following operations: commanding the head to perform a seek operation from a starting track to an ending track; obtaining samples of wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges for sampled tracks traversed during the seek operation; calculating WTWT variations for each sample; and calculating a calibrated misalignment value for each sample based upon WTWT variations.

Disk Drive Adjusting Write Clock Frequency To Compensate For Eccentricity In Disk Rotation

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US Patent:
7251098, Jul 31, 2007
Filed:
Nov 19, 2004
Appl. No.:
10/992930
Inventors:
Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
David Dung Tien Nguyen - Fountain Valley CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/596
G11B 5/09
US Classification:
360 7704, 360 51
Abstract:
A disk drive is disclosed that estimates a sinusoidal error in a wedge time period due to eccentricity in the disk rotating to generate eccentricity compensation values. During a write operation a head is positioned over a target data sector within a target track, a write clock frequency is set using an eccentricity compensation value corresponding to the target data sector, and data is written to the target data sector using the write clock frequency. In this manner, the eccentricity compensation value adjusts the write clock frequency to better optimize the linear bit density from the inner to outer diameter tracks.

Disk Drive Computing Repeatable Run Out While Actuator Arm Is Pressed Against Crash Stop

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US Patent:
7265933, Sep 4, 2007
Filed:
Jun 14, 2005
Appl. No.:
11/152415
Inventors:
Bang X. Phan - Mission Viejo CA, US
David Dung Tien Nguyen - Fountain Valley CA, US
Zhi Wang - San Jose CA, US
Assignee:
Western Digital Technologies, Inc. - Lake Forest CA
International Classification:
G11B 5/596
G11B 5/55
US Classification:
360 7704, 360 7706, 360 7804
Abstract:
A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centric alignment of the disk with respect to the spindle motor. During a calibration mode, the VCM is controlled to press the actuator arm against a crash stop, and the feed-forward compensation value is computed in response to a position error signal (PES). The PES is generated in response to embedded servo sectors recorded on the disk, wherein each embedded servo sector comprises a track address for coarse alignment and servo bursts for fine alignment.

Isbn (Books And Publications)

Global Economic Effects of the Asian Currency Devaluations

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Author

Zhi Wang

ISBN #

0881322601

Control profile
Zhi G Wang from San Jose, CA, age ~76 Get Report