API mismatch: nvidia

I upgrade my ubuntu, but the camera applications give me an error message: API mismatch: nvidia....
I find two versions of the nvidia in my system: one is from the ubuntu repository, i.e., nvidia-current. The other one was installed by myself long time ago by nvidia-installer.
The solution for this issue uses the following command:

sudo nvidia-installer --uninstall

Of course, you also can remove the nvidia-current and run nvidia-installer again. For me, the previous one is simpler.

New paper: Square Root Sigma Point Information Filtering

Recently I have a paper accepted in IEEE Trans. on Automatic Control, which is a great journal. The paper is titled as "Square-Root Sigma-Point Information Filtering". The preprint version of this paper is available HERE. The abstract of this paper is following:

Abstract—The sigma-point information filters employ a number of
deterministic sigma-points to calculate the mean and covariance of a
random variable which undergoes a nonlinear transformation. These
sigma-points can be generated by the unscented transform or Stirling’s
interpolation, which corresponds to the unscented information filter (UIF)
and the central difference information filter (CDIF) respectively. In this
technical note, we develop the square-root extensions of UIF and CDIF,
which have better numerical properties than the original versions, e.g.,
improved numerical accuracy, double order precision and preservation of
symmetry. We also show that the square-root unscented information filter
(SRUIF) might lose the positive-definiteness due to the negative Cholesky
update, whereas the square-root central difference information filter
(SRCDIF) has only positive Cholesky update. Therefore, the SRCDIF
is preferable to the SRUIF concerning the numerical stability.

Very nice idea for presenting the GPA of student

It is not good to show the name of student on the manuscripts, an option to solve such a problem is to show the hash value of student name (plus some random number) using MD5 algorithm. However, the student needs to know his random number. An alternative is to use the matriculation number, so the student has to keep it as secrete, otherwise others may know your scores.

My public key on keyserver: http://keyserver.pgp.com

My public key (key ID: B92C8E6F) on keyserver: http://keyserver.pgp.com

gpg usage note

The gpg has a new version: 1.4.12. When I used gpg --gen-key, it outputted two pairs of keys: main keys for signing and verifying (pub), sub keys for encryption and decryption (sub). However, to encrypt something, it is not necessary to use sub key ID, you can use pub key ID instead.

A good explanation on this topic is here:

http://wlug.org.nz/GPG/PGPNotes

http://ubuntuforums.org/showthread.php?t=680292

A nice book binding shop in Goettingen (for publications,哥廷根书籍装订店)

Today is a big day for me, because I am going to submit my PhD thesis. Since the PCS program in University of Goettingen requires a binded thesis as a book, I have to find a binding shop. My colleague recommends a shop near the city center, which is Dieter Fischbach Buchbinderei. I brought the printed pages to there, and waited for about one hour. The final binded thesis is perfect, which is only cost 4.8 Euro for soft cover pages. Here is the location:

A very nice tutorial of paper writting for TOEFL

Welcome to the TOEFL-Prep Writing Practice Site

http://lrs.ed.uiuc.edu/students/fwalters/toeflwrite.html