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October 29, 2007

Mathematical information theory and cybernetics

The reason for the limited activity on this diary at the moment is that I am working (hard) on my dissertation. I will however try to use this as a notebook of ideas, as I'm seeing myself drowning i references, books, articles that I'm reading and I'm spending more an more time trying to find what I read, where I read it and, where that book is now...

There's an interesting relationship between the mathematical theory of communication; cybernetics; and semiology and my field of inquiry, the question to me being wether the nature of the message is of relevance to the output or the stimuli caused by this message. An example would be: Can a binary signal cause a relevant change--relevant as measured from the outputting system itself--in a continous or analog system. Gregory Bateson [Bateson, 1972] would argue that since there is no such thing as a 'territory' without a 'map', or rather that every perception of the territory is a map, than the signal transmitted will already be a transformation, a map in itself, causing change in another map. This would argue that it is up to the "mapping" of the data rather than the transmission of it. From the point of view of the information theorist the main issue is whether the signal-nois ratio is acceptible.

Obviously the problem is infinitely more complex than how it is stated above, especiallly when the semiologist is allowed to enter the discussion.

Posted by henrikfr at 02:49 PM | Comments (2)

October 01, 2007

Setting up filesharing between OSX and FC5

Now, this is somewhat unrelated to this blog, but I'll put it here anyways - mainly because I need to make notes about how I did it...

I need to be able to access and share files between all my computers - some of which are running Linux (FC5) and some which are running OSX. After fiddling around a little bit I decided to go with Samba as it seemed to be the most straight forward and usable solution.

I began by installing Samba and all its dependencies on my FC5 system by running:

$ yum install samba

In FC5 the samba deamons can be started by running:

$ service smb start

and (optionally)

$ service winbind start

To make the deamons are started at boot time run

$ chkconfig smb on

$ chkconfig winbind on

The main configuration is done in /etc/samba/smb.conf and great help for how to configure it can be found in this document. I wanted a singel directory that would work as a shared volume on the local network so I added restrictions to the hosts allow section (setting its value to 192.168.1. 127. will allow connections only from localhost and the 192.168.1. namespace on the network).

I created a shared volume with adding the following to the smb.conf:

comment = Data
path = /path/to/shared/directory
force user = username
read only = No
guest ok = No
writable = yes
printable = no

Test the config file with:

$ testparm /etc/samba/smb.conf

Add a user to smbpasswd by running:

$ smbpasswd -a user

Now, restart the Samba server and test your configuration:

$ smbclient -L servername

where servername is the address of the server that Samba is running on. If your are issueing the command from the same machine, localhost would be a woring servername. If this works you can try to connect to your service by running

$ smbclient //localhost/data and enter the password you added for the user edited above. In the example, localhost is the server and data is the name of the server as it is defined in the smb.conf.

Now, in OSX use the 'Connect to server...' command and enter: smb://servername/data

as the address. If everything worked out you will now be prompted for your password and onced this is enetered and verified, the volume will appear in the Finder.

Posted by henrikfr at 10:38 PM | Comments (0)