Monday, October 21, 2013

principles of communications, 2013/2014, end of week #2, to L7

To note for today- the slide on graphs, with Edge and Node list has a list of all edges, alongside o nthe right list of nodes  - the list of nodes isn't meant to line up with the list on the left - its just a list for node i=1-5, what other nodes, in the directed graph,  are adjacent (look at arrows on edges - note in 2 cases (1<->2 and 5<->4, they are bi-directional)....

fun references today:-
Ghost Maps




Small Worlds...

DDOS visualised

Couple more corrigenda/errata
1. in the alpha/beta models of random graphs, there's k used for average degree of the net (e.g. pN in the alpha model), but also used for the toal number of edges (N*(N-1)/2) - so take care with k
2. there's an expression in the slides about max-flow in DAR (the "Sticky Random Routing" for the telephoen net) for using Erlang's call blocking probability for a given link, then work out what the toal capacity will be for 1 hop and 2-hop/tandem routes - this has n, which is number of calls you get through, then mentioned a technique called LP  to solve the maximisation problem given in terms of sum of calls that get through (or are blocked) over all direct and tandem routes- we are'nt covering that technique this year, but LP stands for Linear Programming, and is fairly straightforward if you want to look it up - it is commonly used in optimisation and shows up in Operations research/Logistics (freight etc) and so on all the time.

1 comment:

Unknown said...

Vacheron Constantin barrel type case is one of Malta Swiss fake watches brand logo , since 1912 , has been loved by many people . At this year's Geneva Watch Fair , Vacheron Constantin Malte Malta Series Adds four new members : a platinum men's and three ladies watches mechanical watches. Today we'll look at one of the first to appreciate the platinum men's watch from 18K white gold , the series followed the usual minimalist style , to show the real low-key luxury.
In 1912, Vacheron Constantin with absolutely innovative spirit completely broken watch usual circular design has become one of the watch manufacturers use tonneau case of the first type . Since then, the barrel-type design has become Vacheron Constantin fake Rolex replica watches classic style , so many aristocratic gentleman charmed . In the past century , gradually blend of barrel-type design the most prestigious watch making process , creating Vacheron Constantin Malte Malta legends series .
The new series of men's Breitling replica watches online Malte Malta followed the simple and neat style, exquisite curves creating perfect harmony overall shape. 18K white gold case with dimensions of 36.7 x 47.6 mm. 6:00 and 12:00 Roman numerals and hour markers at the same location made of platinum , cleverly catered tonneau shaped curved lines to become a classic series of Malte Malta flag .
Can be seen through the transparent case back on the 4400 manual winding movement, driving the hour hand, minute and small second run smoothly from 127 parts, with approximately 65 hours of power storage. 4400 movement with a swiss Omega replica watches large number of sophisticated manufacturing process is known, and the engraved symbol of excellence in watchmaking Geneva Seal, ensure that the movement of the reliability and craftsmanship.