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Computer Network Time Synchronization: the Network Time Protocol

Computer Network Time Synchronization: the Network Time Protocol

Computer Network Time Synchronization: the Network Time Protocol. David L. Mills University of Delaware http://www.eecis.udel.edu/~mills mailto:mills@udel.edu. Introduction. Network Time Protocol (NTP) synchronizes clocks of hosts and routers in the Internet.

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586 views • 47 slides
Signal Strength-Based Localization in Indoor Wireless Networks

Signal Strength-Based Localization in Indoor Wireless Networks

Signal Strength-Based Localization in Indoor Wireless Networks. A.S. Krishnakumar Avaya Labs ask @avaya.com 5 April 2006. Outline. Introduction Applications of Location Information Location determination in Radio Networks Problem definition for 802.11 Networks

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535 views • 36 slides
Locating Internet Hosts

Locating Internet Hosts

Locating Internet Hosts. Venkata N. Padmanabhan Microsoft Research Harvard CS Colloquium 20 June 2001. Outline. Why is user or host positioning interesting? Two ends of the spectrum #1: RADAR: wireless LAN environment #2: IP2Geo: wide-area Internet environment Summary. Motivation.

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503 views • 34 slides
Long-range Dependency Effects in Network Timekeeping

Long-range Dependency Effects in Network Timekeeping

Long-range Dependency Effects in Network Timekeeping. David L. Mills University of Delaware http://www.eecis.udel.edu/~mills mailto:mills@udel.edu. Sources of error in network timekeeping. Short-range distribution induced errors

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456 views • 33 slides
Self-similar Distributions

Self-similar Distributions

Self-similar Distributions. David L. Mills University of Delaware http://www.eecis.udel.edu/~mills mailto:mills@udel.edu. Minimize effects of serial port hardware and driver jitter. Graph shows raw jitter of millisecond timecode and 9600-bps serial port

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314 views • 19 slides
What to Do With Thousands of GPS Tracks

What to Do With Thousands of GPS Tracks

What to Do With Thousands of GPS Tracks. John Krumm, PhD Microsoft Research Redmond, WA. GPS Data. Microsoft Multiperson Location Survey (MSMLS). Garmin Geko 201 $115 10,000 point memory median recording interval 6 seconds 63 meters. 55 GPS receivers 227 subjects

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212 views • 13 slides

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