[FRIAM] Network Analysis

[Robert Howard]

Phil wrote: Hey, did you know that network maps are real categories of real
systems that are amenable to mathematical analysis??  That's a first!   I
luckily had a great conference on the subject come to town and am enjoying
it thorough ally.   The pure theory guys are still sort of at sea I think,
but I would anyway whether they were or not, right ??   :))

 

I always thought network maps would probably cause slow progress in the
formal mathematical analysis arena. If the nodes are symmetric (or fixed in
a similar manner) then Graph Theory and Stochastic Markov Chains can be
applied. But when a network contains dissimilar node types, the test cases
break the symmetry of node traversals. Each traversal becomes a convoluted
composite recursive function. 

It should be no surprise that the complexity that arises in these types of
functions is deliberately exploited in cryptographic message digests. 

Just look at one hop in the SHA-1 algorithm
http://www.md5security.com/sha-hash-functions/cat.php. It uses 80 hops just
generate the final hash, which is like a network (list) of 80 chained nodes.
A real network is neither a chain nor a tree. It has ugly stuff, like
cycles, state, reconfiguring properties, and errors. 

 

I would be interesting in where the analysis has evolved to.

 

Robert Howard
Phoenix, Arizona

 

  _____  

From: friam-bounces at redfish.com [mailto:friam-bounces at redfish.com] On Behalf
Of Phil Henshaw
Sent: Tuesday, May 22, 2007 5:46 PM
To: 'The Friday Morning Applied Complexity Coffee Group'
Subject: Re: [FRIAM] Global warming - the real story + TeslaMotors and
SpaceX

 

well, a 100mpg car that performs like a 15mpg car does indeed sound so sweet
you wonder if it's true, and if it comes with open roads where you can still
do that sort of thing..., especially when you realize that what we actually
need to keep from multiplying resource consumption with continued growth is
1000 mpg cars by the end of the century and 32000mpg cars by the end of the
next.   I find those efficiencies from a 2nd law obeying systems of any kind
worse than dubious...    

 

Hey, did you know that network maps  are real categories of real systems
that are amenable to mathematical analysis??  That's a first!   I luckily
had a great conference on the subject come to town and am enjoying it
thorough ally.   The pure theory guys are still sort of at sea I think,...
but I would anyway whether they were or not, right ??   :))

 

 


Phil Henshaw                       ¸¸¸¸.·´ ¯ `·.¸¸¸¸
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
680 Ft. Washington Ave 
NY NY 10040                       
tel: 212-795-4844                 
e-mail: pfh at synapse9.com          
explorations: www.synapse9.com <http://www.synapse9.com/>     

-----Original Message-----
From: friam-bounces at redfish.com [mailto:friam-bounces at redfish.com] On Behalf
Of Robert Howard
Sent: Tuesday, May 22, 2007 4:27 PM
To: 'The Friday Morning Applied Complexity Coffee Group'
Subject: Re: [FRIAM] Global warming - the real story + TeslaMotors and
SpaceX

Technologies like this give me hope: http://www.teslamotors.com
<http://www.teslamotors.com/>  

Projects like this give me hope:
http://www.wired.com/science/space/magazine/15-06/ff_space_musk 

The company is owned by Elon <http://en.wikipedia.org/wiki/Elon_Musk>  Musk,
founder of PayPal, and now SpaceX <http://en.wikipedia.org/wiki/SpaceX> 

 

Robert Howard

Phoenix, Arizona

 

 

-----Original Message-----
From: friam-bounces at redfish.com [mailto:friam-bounces at redfish.com] On Behalf
Of Stephen Guerin
Sent: Monday, May 21, 2007 11:10 AM
To: 'The Friday Morning Applied Complexity Coffee Group'
Subject: Re: [FRIAM] Global warming - the real story

 

Googling "Connie Meskimen" shows her to have a sarcastic wit:

http://www.snopes.com/humor/letters/daylight.asp

 

-Steve

 

> -----Original Message-----

> From: Robert Holmes [mailto:robert at holmesacosta.com] 

> Sent: Monday, May 21, 2007 10:04 AM

> To: FRIAM

> Subject: [FRIAM] Global warming - the real story

> 

> At last, someone has had the courage to tell the real story 

> behind global warning.

> 

> Robert

> 

> 

> From the Arkansas Democrat-Gazette, 16 April 2007, "Letters" 

> section, page 6B:

> 

> "You may have noticed that March of this year was 

> particularly hot. As a matter of fact, I understand that it 

> was the hottest March since the beginning of the last 

> century. All of the trees were fully leafed out and legions 

> of bugs and snakes were crawling around during a time in 

> Arkansas when, on a normal year, we might see a snowflake or two.

> 

> This should come as no surprise to any reasonable person. As 

> you know, Daylight Savings Time started almost a month early 

> this year. You would think that members of Congress would 

> have considered the warming effect that an extra hour of 

> daylight would have on our climate. Or did they?

> 

> Perhaps this is another plot by a liberal Congress to make us 

> believe that global warming is a real threat. Perhaps next 

> time there should be serious studies performed before 

> Congress passes laws with such far-reaching effects.

> 

> Connie M. Meskimen

> Hot Springs"

> 

> 

> 

 

 

============================================================

FRIAM Applied Complexity Group listserv

Meets Fridays 9a-11:30 at cafe at St. John's College

lectures, archives, unsubscribe, maps at http://www.friam.org

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://redfish.com/pipermail/friam_redfish.com/attachments/20070526/d814de40/attachment.html