Tuesday, December 20, 2011

Web Browser Behavior Exploitation

The use of web behavior data is important to get feedback from customers. The feedback from customers can be divided into two groups, explicit and implicit feedback. Below are some items of that feedback.
Explicit feedback
  • specified keyword
  • selected & market document
  • rated items
Implicit feedback
  • natural interaction of the system
  • no extra cost
  • less accurate
  • can be combined with explicit feedback
  • Potential observable behavior
  • “modeling information content using observable behavior” (ASIST, 2003).
That feedback is analyzed from year to year. Based on web browsing behavior data, in implicit feedback, web browsing behavior was focused on widely (www). Since 1995, researchers perform research on web browsing behavior (www started in 1991).

Thursday, December 08, 2011

Solve Unknown Monitor (or Monitor not Detected) in Ubuntu 11.10

If you have the same problem as the title of this post, Ubuntu unknown monitor or Monitor not detected in Ubuntu 11.10, hope this tweaks help you. Previously, I upgraded my 11.04 Ubuntu to 11.10. No problems appear except can be solved as I post in GNU/Linux label in this blog. Yesterday, I got the problem after running some tweaks and computer janitor (maybe that caused the  problem). My screen or display resolution is changed to lower resolution, i.e 1024x768.

Then, I try to change manually trough display configuration. What I get is my monitor not detected by Ubuntu. It said unknown monitor. I run xrandr in terminal, and got the following output
$ xrandr
xrandr: Failed to get size of gamma for output default
After a day find solution, below is work for me. Find the similar code in your /etc/boot/grub.cfg. For example, type in terminal: sudo gedit /etc/boot/grub.cfg
linux    /boot/vmlinuz-2.6.32-26-generic root=UUID=c3732ca6-61fa-48c6-b115-6ed668cdeedd ro ...
Add the "i915.modeset=1 gfxpayload=1366x768". So, it becomes
linux    /boot/vmlinuz-2.6.32-26-generic root=UUID=c3732ca6-61fa-48c6-b115-6ed668cdeedd ro i915.modeset=1 gfxpayload=1366x768 quiet splash
And reboot. It works for me, and I hope also for you. Don't forget to change screen resolution according to your display size. The  figure below show the difference when I got the problem and after solving it.
My laptop display when got unknown monitor problem.
The screen resolution is low i.e 1024x768
My screen after solving the problem with 915 driver. I  looks clear
Note that the problem above is caused by VGA driver which disappear unfortunately. So, I add 915 driver on boot based on reference from internet source.

Wednesday, December 07, 2011

The Acoustics Branch: Time-Space Representation

The Acoustics and Its branch in space-time representation [1]

Acoustics science has many branch, one of interest point is analyze sound wave from space-time point of view. A research group in EPFL, Switzerlan, has studied Nonparametric representations of acoustic wave fields obtained by observing the sound pressure along a straight line using a microphone array contain implicit information of the surrounding acoustic scene, both in terms of spatial arrangement of the sources and their respective temporal evolution.

For more information, please visit the reference source below.

[1] http://lcav.epfl.ch/research/space_time_frequency
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