Yi I Zheng

US Patent:

6813006, Nov 2, 2004

Filed:

May 7, 2003

Appl. No.:

10/431492

Inventors:

Ruyong Wang - St. Cloud MN 56304
Yi Zheng - Sartell MN 56377
Aiping Yao - St. Cloud MN 56301

International Classification:

G01P 336

US Classification:

356 28, 356 285, 356477

Abstract:

A stand-alone speedometer includes an electromagnetic wave source, a beam splitter, a detector and two media with different dispersive dragging effects. An electromagnetic wave is divided into two beams by the beam splitter. The two beams pass the two media differently and they combine again to go on to a detector, giving rise to interference which records the travel-time difference between two beams. Because the two media have different dispersive dragging effects on the propagation of the electromagnetic wave, measuring the change of the travel-time difference when the apparatus is stationary to that when the apparatus is moving will give the translational speed of the apparatus.

US Patent:

7406066, Jul 29, 2008

Filed:

Oct 9, 2003

Appl. No.:

10/684150

Inventors:

Yi Zheng - Sartell MN, US
Aiping Yao - St. Cloud MN, US

International Classification:

H04B 7/216

US Classification:

370335, 370441, 370463, 375146, 375147, 375346

Abstract:

The present invention of the modulation and demondulation removes the carry synchronization requirement for spread spectrum systems and code-division multiple access communication systems. The invention uses the PN codes that are specially selected and asynchronous demodulation procedure. If number of transmitters is limited, the Multiple Access Interference (MAI) due to carry differences of transmitters can be completely cancelled. Using this invention, signal from a desired transmitter can be demodulated and detected from received signals included from other transmitters in multiple access applications, even when the frequencies of transmitters are different from each other and are not synchronized with a receiver. The invention greatly reduces complexities of a wireless system where Code Division Multiple Access (CDMA) or spread spectrum is used. It expands applications of wireless communication.

US Patent:

7586587, Sep 8, 2009

Filed:

Jan 14, 2005

Appl. No.:

11/035659

Inventors:

Ruyong Wang - St. Cloud MN, US
Yi Zheng - Sartell MN, US
Aiping Yao - St. Cloud MN, US

International Classification:

G01P 3/36
G01C 19/72

US Classification:

356 285, 356460, 356482

Abstract:

A stand-alone speedometer directly measuring the translational speed of a moving body comprises a source emitting two spaced light beams which interfere each other, mirrors or beam splitters changing directions of propagation of light beams, and a detector measuring the phase difference of light beams. Compared with the phase difference when the speedometer is stationary, the detector measures a first-order change of phase differences, which indicates the motion speed.

US Patent:

7753847, Jul 13, 2010

Filed:

Sep 28, 2006

Appl. No.:

11/536330

Inventors:

James Fowler Greenleaf - Rochester MN, US
Shigao Chen - Rochester MN, US
Yi Zheng - Cold Spring MN, US

Assignee:

Mayo Foundation for Medical Education and Research - Rochester MN

International Classification:

A61B 8/00

US Classification:

600438, 73574, 73579, 73587, 73609, 600443

Abstract:

A method for measuring a mechanical property of a subject includes using an ultrasonic transducer to apply ultrasonic vibration pulses to a vibration origin in the subject in an on-off time sequence in order to impart a harmonic motion at a prescribed frequency to the subject, and when the vibration pulses are off, using the same transducer to apply ultrasonic detection pulses to a motion detection point and to receive echo signals therefrom in order to sense the harmonic motion on the subject at the motion detection point. From the harmonic signal information, a harmonic signal is detected and a characteristic such as amplitude or phase of the detected harmonic signal is measured. The mechanical property is calculated using the measured characteristic using for example a wave speed dispersion method.

US Patent:

7785259, Aug 31, 2010

Filed:

Oct 1, 2004

Appl. No.:

10/956461

Inventors:

Yi Zheng - Sartell MN, US
Wei Tan - St. Cloud MN, US
James Fowler Greenleaf - Rochester MN, US
Shigao Chen - Rochester MN, US

Assignee:

Mayo Foundation for Medical Education and Research - Rochester MN

International Classification:

A61B 8/00

US Classification:

600438, 600441, 600442, 600444, 601 2, 606128, 73 182, 73 189

Abstract:

Harmonic motion is produced in a subject using vibro-acoustography. An ultrasonic imaging system repetitively interrogates the subject and the Doppler shift in the reflected echo signals is analyzed to measure the phase and amplitude of harmonic motion produced in the subject at different prescribed frequencies. Shear wave propagation through the subject is determined from this information and mechanical properties related to “stiffness” of the subject are determined. A Kalman filter is employed in the phase and amplitude measurement to extract the harmonic motion information from background noise.

US Patent:

8121205, Feb 21, 2012

Filed:

Mar 20, 2008

Appl. No.:

12/077615

Inventors:

Yi Zheng - Cold Spring MN, US
Joel R. Goergen - Maple Grove MN, US

Assignee:

Force10 Networks, Inc. - San Jose CA

International Classification:

H04K 1/10

US Classification:

375260, 375259

Abstract:

Methods and apparatus for serial channel operation are disclosed. An N+1-level signaling scheme is used to transmit N staggered but overlapping NRZ sub-sequences concurrently on a serial channel. Each sequence has a bit rate R and an essential bandwidth of R Hz. The combined bit rate of the channel is N×R, but due to a lack of correlation between the sub-sequences, the essential bandwidth remains approximately R Hz. The signaling scheme also contains redundancy that allows some errors to be detected and/or corrected. Other embodiments are also described and claimed.

US Patent:

8168891, May 1, 2012

Filed:

May 2, 2008

Appl. No.:

12/151088

Inventors:

Joel R. Goergen - Maple Grove MN, US
Yi Zheng - Cold Spring MN, US

Assignee:

Force10 Networks, Inc. - San Jose CA

International Classification:

H05K 1/00

US Classification:

174258, 174255

Abstract:

Circuit boards and methods for their manufacture are disclosed. The circuit boards carry high-speed signals using conductors formed to include lengthwise channels. The channels increase the surface area of the conductors, and therefore enhance the ability of the conductors to carry high-speed signals. In at least some embodiments, a discontinuity also exists between the dielectric constant within the channels and just outside the channels, which is believed to reduce signal loss into the dielectric material.

US Patent:

8259847, Sep 4, 2012

Filed:

Oct 13, 2011

Appl. No.:

13/272329

Inventors:

Yi Zheng - Cold Spring MN, US
Joel R. Goergen - Maple Grove MN, US

Assignee:

Force10 Networks, Inc. - San Jose CA

International Classification:

H04K 1/02
H04L 27/00

US Classification:

375296, 375295

Abstract:

Methods and apparatus for serial channel operation are disclosed. An N+1-level signaling scheme is used to transmit N staggered but overlapping NRZ sub-sequences concurrently on a serial channel. Each sequence has a bit rate R and an essential bandwidth of R Hz. The combined bit rate of the channel is N×R, but due to a lack of correlation between the sub-sequences, the essential bandwidth remains approximately R Hz. The signaling scheme also contains redundancy that allows some errors to be detected and/or corrected. Other embodiments are also described and claimed.