Angela M Wang

US Patent:

20100088405, Apr 8, 2010

Filed:

Oct 8, 2008

Appl. No.:

12/247394

Inventors:

Cheng Huang - Redmond WA, US
Jin Li - Sammamish WA, US
Angela Wang - Hauppauge NY, US
Keith Wimberly Ross - New York NY, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 15/16

US Classification:

709224, 709226

Abstract:

Charting a content distribution system (CDN) involves identifying a set of DNS servers that may be used as vantage points to test delay performance to a CDNs content server. As provided herein, to identify potential vantage point DNS servers, a set of authoritative name servers is identified and, from that set, those authoritative name servers that respond to a DNS query are identified as responsive authoritative name servers. Identifying a CDN content server that serves a particular vantage point DNS server involves retrieving an IP address for the CDN content server from a DNS query to the DNS server corresponding to the vantage point. The delay performance between the vantage point DNS server and the CDN content server can then be determined. Further, one can determine locations to deploy new data centers for a CDN based on delay performance, A delay from one or more vantage points to an existing CDN's DNS servers can be measured, and desired rank of locations can be generated. A location of a new data center can be selected based on a desired delay performance ranking.

US Patent:

57063699, Jan 6, 1998

Filed:

May 31, 1995

Appl. No.:

8/456137

Inventors:

Angela L. Wang - Huntington Beach CA
David M. Colwell - Anaheim CA
Dianne L. Steiger - Irvine CA

Assignee:

Rockwell International Corporation - Newport Beach CA

International Classification:

G06K 942
H04N 140

US Classification:

382299

Abstract:

A resolution conversion system for real-time expansion and reduction of a first plurality of input pixels into a second plurality of output pixels. The resolution conversion system comprises a base-n counter for counting input pixels as each pixel is captured. The base-n counter has a plurality of carry out signals. Also, there is a control register for selectively enabling the carry out signals of the base-n counter based on a predetermined resolution ratio between the first plurality of input pixels and the second plurality of output pixels. The control register uses a mode bit to select either one of inserting and removing operations. An inserting logic unit is used for inserting, as indicated by the mode bit, a pixel into the plurality of input pixels upon a transition of one of the carry out signals if the carry out signals have been enabled by the control register. A removing logic unit is used for removing, as indicated by the mode bit, a pixel from the plurality of input pixels upon a transition of one of the carry out signals of the base-n counter if the carry out signals have been enabled by the control register.