Kai Yun Sun

7788718, Aug 31, 2010

Jun 13, 2002

10/171937

Aiguo Fei - San Jose CA, US
Kai Sun - Mountain View CA, US
Fengmin Gong - Livermore CA, US

McAfee, Inc. - Santa Clara CA

G06F 12/14
G06F 12/16
G08B 23/00

726 22, 726 14, 726 23, 726 25

A method of identifying a distributed denial of service attack is described in which a rate profile is determined, where the rate profile corresponds to information transfer rates at which information is received from a network. A burst magnitude threshold based on this rate profile is then established. A burst duration profile characterizing periods of time during which the information transfer rate exceeds this burst magnitude threshold is also calculated, and a burst duration threshold is then defined based upon this burst duration profile. A distributed denial of service attack is identified when the information transfer rate exceeds the burst magnitude threshold for a period of time exceeding the burst duration threshold.

8471610, Jun 25, 2013

Oct 25, 2011

13/280458

Kai Sun - Palo Alto CA, US
Qiang Zhou - San Jose CA, US

Electric Power Research Institute, Inc. - Charlotte NC

H03L 7/06

327156

The present invention relates to a method for accurately detecting oscillations and improving stability of power systems. The method includes the steps of providing a phase-locked loop having a phase detector, a loop filter, and a number-controlled oscillator. The method further includes the steps of extracting an input signal from the power system, using the phase-locked loop to track the frequency and phase of a targeted mode in the input signal, and creating a locally generated reference signal to fit the input signal and to allow the input signal's modal information to be obtained. The method further includes the step of performing mode shape analysis utilizing the reference phase signals constructed from the tracked frequencies.

8606422, Dec 10, 2013

Nov 17, 2010

12/948188

Kai Sun - Palo Alto CA, US
Kyeon Hur - Palo Alto CA, US
Pei Zhange - Palo Alto CA, US

Electric Power Research Institute, Inc. - Charlotte NC

G05B 15/02

700292, 702188

This invention relates to a PMU-based controlled system separation method to protect against a catastrophic blackout. The method includes the steps of performing an offline analysis of an electrical transmission network to partition generators into a number of coherent groups, performing online monitoring of the transmission network to determine a separation interface and frequencies and damping ratios of dominant inter-area modes, and estimating the risk of system separation to perform real-time control.

57778132, Jul 7, 1998

Mar 10, 1995

8/412651

Kai C.K. Sun - Saratoga CA
James A. Herbst - Longmont CO
Chih-Hsiung Chang - San Jose CA
Mansur B. Kiadeh - Cupertino CA

Syquest Technology, Inc. - Fremont CA

G11B 503

360 66

A disk drive system having downward compatibility includes a read/write head and a feedback servo controller for reading and writing information to and from a removable disk cartridge. When writing information to the data tracks of magnetic medium of a lower-capacity disk cartridge, in which the data tracks are substantially wider than the width of the read/write head, the read/write head is operated in an erase mode for several resolutions prior to writing the data. The read/write head is first shifted off track center by a small DC offset, then operated in an erase mode while being guided in a repeating oscillating pattern under closed loop servo control. The read/write head is then shifted off track center in the other direction, then again operated in an erase mode while being guided in a repeating oscillating pattern under closed loop servo control. A higher capacity disk drive system can thereby read and write data to the removable disk cartridge such that data which it stores on a lower-capacity removable disk cartridge may be read by lower-capacity disk drive systems without sideband interference.

20230099875, Mar 30, 2023

Oct 28, 2022

18/050603

- San Francisco CA, US
Kai Sun - Cupertino CA, US

H04N 21/472
H04N 21/44
H04N 21/442
H04N 21/439
H04N 21/4415
H04N 21/422

Example embodiments provide systems and methods for rewinding digital content during playback based on context of the digital content. A content rewind system electronically accesses digital content. A rewind trigger is detected by the system. The system analyzes the digital content to detect at least one dialog segment within the digital content. The analysis is based on context of the digital content (e.g., dialog within the digital content). The system rewinds playback of the digital content by rewinding to a starting point of a previous dialog segment.

20210051375, Feb 18, 2021

Jul 29, 2020

16/941895

- San Francisco CA, US
Kai Sun - Cupertino CA, US

H04N 21/472
H04N 21/439
H04N 21/44
H04N 21/4415
H04N 21/442

Example embodiments provide systems and methods for rewinding digital content during playback based on context of the digital content. A content rewind system electronically accesses digital content. A rewind trigger is detected by the system. The system analyzes the digital content to detect at least one dialog segment within the digital content. The analysis is based on context of the digital content (e.g., dialog within the digital content). The system rewinds playback of the digital content by rewinding to a starting point of a previous dialog segment.

20170366857, Dec 21, 2017

Jun 15, 2016

15/183604

- San Francisco CA, US
Kai Sun - Cupertino CA, US

H04N 21/472
H04N 21/4415
H04N 21/44
H04N 21/442
H04N 21/439

Example embodiments provide systems and methods for rewinding digital content during playback based on context of the digital content. A content rewind system electronically accesses digital content. A rewind trigger is detected by the system. The system analyzes the digital content to detect at least one dialog segment within the digital content. The analysis is based on context of the digital content (e.g., dialog within the digital content). The system rewinds playback of the digital content by rewinding to a starting point of a previous dialog segment.

20170309296, Oct 26, 2017

Apr 22, 2016

15/136278

- San Francisco CA, US
Kai Sun - Cupertino CA, US

G10L 21/043
H04N 21/439
H04N 21/233
G10L 15/25
G10L 25/78
G10L 25/57
H04N 21/472
H04N 21/2387

Example embodiments provide systems and methods for accelerating digital content playback based on speech. A content acceleration system electronically accesses digital content. The system analyzes the digital content to detect at least one audio portion within the digital content, each of the at least one audio portion comprising speech. The system creates at least one digital content segment from the digital content based on the at least one audio portion, whereby a beginning of each digital content segment of the at least one digital content segment coincides with a beginning of a corresponding audio portion of the at least one audio portion. The system then accelerates playback of the digital content by fast forwarding through parts of the at least one digital content segment where speech is absent.