Why not blogging?

Observation

I am terrible at keeping things going.

And this blog is no exception. I realized my latest entry was 8 years old. Shame!

Now, I am wondering why I even wanted to start this blog in the first place. But what's more important now for me is: why would I continue and commit entries in this blog right now? For what purpose?

Why ?

The answer came up straight for me.

I want to make this blog a way to share my own experience to a broader audience than my own little circle.

With the motivation that it might just help someone.

For who?

Someone who is like my younger self and who just might benefits from the knowledge of a more experienced one. But this may be misinterpreted as 'when you grow older you get wiser' which we all know is not exactly true [sarcastic laugh].

Sharing my own experiences, good or bad, my struggles or successes with technology, science, management, colleagues, creativity etc... might just help somebody! That's a powerful motivation for me to share and continue making those blog posts but with a different intent.

In a nutshell I would like to:

Share experience on stuffs that worked for me or didn't, trying to analyze why
Summary of stuffs that helped me (books, talks, videos) and why
Discussing with others about their positive or negative experiences and retrospect
Figuring out the best ways to share what I believe to be the most insightful

Building a Better World

I truly think we should all try to make things better than they are. That's a beautiful statement but how to make it happen for real is often more difficult! I just want to make baby steps in that direction and start by trying to build on top of what I learned to be useful. It's only the first step that count.

I clearly hope that this will bring a lot of positive change!

Comments

Shear waves, medecine and brain

Yesterday evening, too bored by what TV was proposing to me, I decided to watch a conference of Mathias Fink , a french researcher working on multidisciplinary application of waves. Specially shear waves. Here is a brief summary of his talk. In solids, waves have two principal components: compression waves (P-waves for primary) moving in the direction of propagation, and shear waves (S-waves, for secondary) that make ripples in the plane orthogonal to that direction. Since compression waves propagate in the direction of propagation, they move faster than shear waves. Usually ultrasound equipment in medicine only use compressional waves. But since human tissues have a high bulk modulus, the P-wave speed is relatively constant (around 1580 m/s). Human tissues are very stiff if you apply isotropic constraints on them (like pressure of water). However M. Fink and his colleagues proposed a new way to investigate human tissues by first sending a strong compressional wave in ...

Hypnothic patterns of integrer decomposition

http://www.datapointed.net/visualizations/math/factorization/animated-diagrams/

MultiThreading and Direct Solvers

The next step towards an efficient Hybrid Solver is to optimize the computation of the Schur complement on each subdomain. Actually this part of the algorithm is the slowest, and it can be very slow. First of all the reordering is special, since the degrees of freedom on the interior must be numbered first. I use the CAMD ordering by Tim Davis and al., that provide satisfaying enough orderings. After that, I am concentrating on the code that computes the Schur complement. There is much work to do here. At the begining I was thinking about using MUMPS for this, since it has a subroutine for Schur complement computation and it is multithreaded. By googling around I found there is may be a (slightly) better solution, that would be to implement a sparse Cholesky solver based on the Direct Acyclic Graph (DAG) of the tasks. The computational tasks and their dependencies are expressed as an acyclic graph which is used to organize the thread hierachy to compute the Cholesky decompositio...

New Horizons

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