19/10/2018 Παρουσίαση Διπλωματικής Εργασίας, κ. Νταλλαρή Ευστράτιου

Παρουσίαση Διπλωματικής Εργασίας
κ. Νταλλαρή Ευστράτιου
“  One-Way Delay Computations for Real Time Clock Synchronization ”
στο ‘Εργαστήριο Τεχνητής Νοημοσύνης και Μηχανικής Συστημάτων (ΤΝΜΣ-Α)
Παρασκευή 19 Οκτωμβρίου 2018, 18:30
 
 
Global time agreement and clock synchronization in a network of nodes are important issues which cannot be easily measured due to unstable delays and asymmetric paths. An important metric used to obtain an estimation of the network delays is round-trip time. Round-trip time is often for approximating one-way delay. Specifically, under a common, assumption that the path is symmetric, one-way delay is estimated as half the round-trip time.  However, very often this estimation is not very accurate.
 
Thus, the aim of this thesis is to review and implement more accurate one-way delay estimation methods based on Network Calculus. We implement Yoo and Choi’s model that focuses on measuring round-trip time on both sides with a ping pong procedure to estimate one-way delay. We compare divergence of this method to the common practice of using “half the round-trip time”. We also implement Aoki, Oki, and Cessa’s model to measure one-way delay variation by relating it to inter-packet delay, providing linear regression to remove the clock skew. Experiments were performed on CAN Bus with two AVR microprocessors, and on Ethernet with two Odroid XU4 connected to a fast Ethernet router. Results show that one-way delay can, be computed much more accurately than earlier approximations. Moreover, CAN network offers a much smaller one-way delay ariation than Ethernet.
--
 
Ευχαριστώ,
 
Μιλτος
 
From: Grammatikakis Miltos
Sent: Thursday, October 18, 2018 11:04 PM
To: ieallstaff ieallstaff
Subject: FYI: Παρουσίαση Διπλωματικής Εργασίας - Παρασκευή 19 Οκτωμβρίου 2018, 18:30 μ.μ