Lan H Vu

20030023739, Jan 30, 2003

Jul 28, 2001

09/917412

Lan Ngoc Vu - Austin TX, US

G06F015/16

709/230000, 709/203000

System and method adapted to multi-cast over the Internet using multiple tiers of servers. Preferably, the content server transmits content to servers in the next lower tier, which may include one or more client servers, using multi-cast, but may use uni-cast. Preferably, each server in all intermediate tiers transmits content to the servers in the next lower tier, which may include one or more client servers, using multi-cast, but may use uni-cast. Each client server transmits to its clients using multi-cast. The quality of a live cast received by each client server may be improved using the more efficient UDP/IP for downloading the bulk of the content and compensating for the occasional lost segments of data using the more reliable TCP/IP.

20060230446, Oct 12, 2006

Apr 6, 2005

11/100304

Lan Vu - Round Rock TX, US

G06F 15/16

726015000

System and method for operating, via the Internet, a distributed network in which an SSL VPN is employed to establish and manage an IPSec VPN. During network creation, an SSL VPN is first established between a master server and each node. Using a common routing table and a common SSL key table maintained by the master server, each node may selectively establish an IPSec VPN with other nodes. Once established, each node maintains a respective segment of a distributed IPSec key table. Periodically, each client and each server, other than the master server, cooperates with the master server to refresh the master and local copies of the common routing and common SSL key tables, and the local segment of the distributed IPSec key table. In the event a change has occurred in either the routing or key information for any server, all pending IPSec VPN connections with that server must be reestablished, using the information in the refreshed local copies of the common routing and common SSL key tables The master server controls the network configuration by assigning to each node permissible IPSec connections. By updating and maintaining copies of the common routing and common SSL key tables at multiple nodes in the network, and local segments of the distributed IPSec key table, the network can quickly recover and rebuild itself in the event that an SSL or IPSec connection with any node is lost.

20070233874, Oct 4, 2007

May 31, 2007

11/809582

Lan Vu - Austin TX, US

G06F 15/173

709226000

System and method adapted to multi-cast over the Internet using multiple tiers of servers. Preferably, the content server transmits content to servers in the next lower tier, which may include one or more client servers, using multi-cast, but may use uni-cast. Preferably, each server in all intermediate tiers transmits content to the servers in the next lower tier, which may include one or more client servers, using multi-cast, but may use uni-cast. Each client server transmits to its clients using multi-cast. The quality of a live cast received by each client server may be improved using the more efficient UDP/IP for downloading the bulk of the content and compensating for the occasional lost segments of data using the more reliable TCP/IP.

62705806, Aug 7, 2001

Apr 12, 1999

9/291138

Lan Vu - Austin TX
Dennis C. Swartz - Buda TX
Jeff Watts - Georgetown TX

Advanced Micro Devices, Inc. - Sunnyvale CA

C23C 1600

118666

A method and apparatus for forming high-quality deposited material layers in semiconductor manufacturing are provided. In the method, the initial stages of a deposition are performed with no current flowing through substrate heater filaments. Current is restored to the heater filaments when needed to maintain the substrate within an acceptable range around a target or setpoint temperature. When an on/off temperature controller is used, the method may be implemented without disturbing the normal operation of the controller, by monitoring the heater filament current and beginning a deposition just after the current has been turned off by the controller. Current may also be removed from the heater filaments at the end of the deposition, so that concentrations of deposition species may equilibrate without the presence of heater currents. Performing as much of the deposition as possible with the substrate heater current off is believed to reduce defect formation which may be associated with magnetic fields and outgassing resulting from heater filament operation. A substrate heater design is provided in which heater filaments are eliminated and the substrate is heated using a heated, circulating fluid.