David Kuk Choi

US Patent:

8116225, Feb 14, 2012

Filed:

Oct 16, 2009

Appl. No.:

12/581018

Inventors:

Kanapathipillai Ketheesan - San Francisco CA, US
David Choi - Cupertino CA, US

Assignee:

Venturi Wireless - Sunnyvale CA

International Classification:

H04L 12/26

US Classification:

370252, 709224, 709233

Abstract:

A bandwidth estimation algorithm detects peaks and/or average per-user bandwidth of data communication networks, such as narrowband and broadband wide-area radio access networks. Estimation can be performed at the TCP/IP layer with no lower layer (PHY, MAC, etc. ) information assumed to be available. However, the bandwidth estimation algorithm can be applied to anywhere bandwidth needs to be estimated as well.

US Patent:

8172454, May 8, 2012

Filed:

Feb 12, 2009

Appl. No.:

12/370529

Inventors:

David Choi - Davis CA, US

International Classification:

B01F 15/06

US Classification:

366147, 366347

Abstract:

A cooling stick for a blender includes a cylindrical member designed to fit tightly through a circular aperture extending through the blender lid. The member has a lower portion and an upper portion with a surrounding rim of a diameter larger than the circular aperture. The lower portion has a lower end sized and shaped to avoid contact with the blender blade assembly. The cylindrical member has an interior chamber, an opening extending from an exterior of the member to the chamber and means for sealing the opening. A cooling fluid is located within the interior chamber. The fluid is cooled or frozen when the cooling stick is located in a cooling environment. When the chilled cooling stick is mounted to the lid of the blender, the cooling stick will cool contents of the blender when the blender is operated. The cooling stick also cools the blender contents after operation.

US Patent:

8351358, Jan 8, 2013

Filed:

Dec 7, 2009

Appl. No.:

12/632700

Inventors:

Kanapathipillai Ketheesan - San Francisco CA, US
Krishna Ramadas - Cupertino CA, US
Chico Jayanthan - San Ramon CA, US
David Choi - Cupertino CA, US

Assignee:

Venturi Wireless, Inc. - Sunnyvale CA

International Classification:

H04B 7/00

US Classification:

370310

Abstract:

A system for optimizing communications on a radio network by altering transitions between different link states that includes several modules. The activity, environment, and load module monitor monitors the link layer based on spectral-load metrics and radio-link metrics. The state transition control module determines when user equipment transitions between different states based on the type of user equipment, user equipment battery life, whether the user equipment is connected to an alternating current outlet, a spectral cost, and a backhaul cost. The channel state influencer module uses any of direct messages, ping messages, and keep-alive messages to influence the link state. The policy and preference handler enables or disables transitions based on the bearer technology type, the type of user equipment, the user's subscription plan, and the load level on the network.

US Patent:

8388217, Mar 5, 2013

Filed:

Mar 23, 2012

Appl. No.:

13/429160

Inventors:

David Choi - Davis CA, US

International Classification:

B01F 15/06

US Classification:

366147, 366347

Abstract:

A cooling stick for a blender includes a cylindrical member designed to fit tightly through a circular aperture extending through the blender lid. The member has a lower portion and an upper portion with a surrounding rim of a diameter larger than the circular aperture. The lower portion has a lower end sized and shaped to avoid contact with the blender blade assembly. The cylindrical member has an interior chamber, an opening extending from an exterior of the member to the chamber and means for sealing the opening. A cooling fluid is located within the interior chamber. The fluid is cooled or frozen when the cooling stick is located in a cooling environment. When the chilled cooling stick is mounted to the lid of the blender, the cooling stick will cool contents of the blender when the blender is operated. The cooling stick also cools the blender contents after operation.

US Patent:

20120106385, May 3, 2012

Filed:

Jan 6, 2012

Appl. No.:

13/345550

Inventors:

Kanapathipillai KETHEESAN - San Francisco CA, US
David Choi - Cupertino CA, US

International Classification:

H04W 24/02

US Classification:

370252

Abstract:

A bandwidth estimation algorithm on shared links detects peaks and/or average per-user bandwidth. Estimating is performed at the transport or IP layer with no assistance from lower layer (PHY, MAC, etc.) and the techniques can be used for any of adjusting the level of video optimization to the available bandwidth; driving QoS decisions at the transmitter based on available bandwidth; improving QoS enforcement during transitions among hybrid technologies on a wireless links; and correcting estimates on devices delivering bursty payload.