Posted on April 21, 2010 by Binlin Wu

One computer got this virus the other day from a USB drive.

We got autorun.inf in the flash drive and *c:\recycler\s-1-5-21-1482476501-1644491937-682003330-1013\csrxx.exe *which are created by the virus.

More details about this virus could be read here: http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Worm%3AWin32%2FHamweq.BW

We tried the Norton Antivirus with latest database, Symentec Endpoint Protection with latest database. Norton found the virus and tried to remove it, but it showed “Quarantine Failed”, “Clean failed”.

Then I tried Kapersky, it did the work.

30 day trial is fine.

Filed under: Software, Virus and Spyware | Leave a comment »

Posted on April 17, 2010 by Binlin Wu

I installed Kaspersky on one computer. I didn’t have any problem browsing internet. But with another computer, I can’t go to any website with either IE or firefox.

The solution is the following:

Go to “Settings” -> “Options” -> “Network”, choose “Monitor selected ports only” then click “Select” and In the list to “Monitor all ports for specified applications”, uncheck IE and firefox. Or if you want, you can also uncheck “Monitor all ports for specified applications”. Click OK. That’s it.

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Posted on April 2, 2010 by Binlin Wu

If you have enough memory, do the following.

`a = ones(10000,1000);`

Then do something like

Then compare

Case 1:

`for i = 1:10`

b = sqrt(a.^2);

end

Case 2:

`b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);b = sqrt(a.^2);`

`% run in one command line`

Case 3:

`b = sqrt(a.^2);`

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

b = sqrt(a.^2);

% run in separate command lines

You’ll get 1st and 2nd case run almost with the same speed (maybe different, I can’t tell significant difference.) But 3rd case will be much faster.

Why?

Filed under: Matlab | 1 Comment »