Oct 222015

بعد از مقداری مشورت با عزیزان مشاور، تصمیم گرفتم دست‌نوشته‌های درس فرایندهای تصادفی را فعلا همینطور که هست به صورت عمومی بر روی اینترنت قرار دهم.

دو نگرانی باعث می‌شد که برای عمومی کردن دست‌نوشته‌ها مقاومت داشته باشم. اول اینکه احساس می‌کردم با در دسترس بودن این نوشته‌ها، بچه‌ها دیگر به کتاب‌های مرجع درس مراجعه نخواهند کرد. متاسفانه این‌طور که متوجه شده‌ام در هر صورت تعداد کمی از دانشجوها کتاب‌های مرجع دروس را می‌خوانند و عموما بیشتر به جزوه‌ها تکیه می‌کنند. در این صورت شاید وجود متنی منسجم به یادگیری آن‌ها بیشتر هم کمک کند (در هر صورت مایل هستم تاکید کنم که برای یادگیری چنین درسی هیچ چیز جای خواندن کتاب را نمی‌گیرد). دغدغه دومم هم این بود که دست‌نوشته‌ها را به قصد استفاده شخصی خودم می‌نویسم و به همین دلیل نه کامل و روان هستند و نه خالی از اشکال. با این حال فکر کردم شاید این نوشته‌ها از جزوه‌هایی که خود بچه‌ها می‌نویسند بیشتر به کارشان بیاید. خصوصا که به علت فشردگی محتوای درس مجبور شده‌ام از بعضی بخش‌ها سریع عبور کنم.

این نکته را هم بگویم که محتوی تصویب شده درس فرایندهای تصادفی دانشکده کامپیوتر متناسب با نیازهای گروه هوش مصنوعی دانشکده تهیه شده است و غیر از مبحث فرایندهای تصادفی، شامل مباحثی از نظریه تخمین و پیشبینی و همچنین مدل‌های گرافیکی می‌شود.

دست‌نوشته‌ها را می‌توانید از اینجا دانلود کنید.

 Posted by at 2:33 am
Apr 172012

Last week, I have found that Abbas El Gamal (in collaboration with Young-Han Kim) published the book “Network Information Theory” which is based on his lecture note he already put it on arXiv. This is a really great book as it covers both classical and recent results in information theory and network information theory. This book was missing in this field and I am happy that an expert gathers some of the most important results in a book and present them in a unified manner.

 Posted by at 11:37 am
Apr 052012

You might have heard about Stephen Boyd who is a professor in the department of Electrical Engineering at Stanford University. He came here to EPFL about a week ago to give a talk about “Convex Optimization” problems. I had already heard that he was a great lecturer but his teaching abilities were beyond my expectations.

During his talk he mentioned to one of the toolboxes which have been developed in his group to solve Convex Optimization problems. I have found this package sometime ago to solve a rate optimization problem and fount it quite convenient to use. After the talk, I thought that it would be good idea to introduce it here. The name of the package is CVX and it is written under MATLAB.

As an example, in order to solve the following problem

$latex \mathrm{minimize}\ ||Ax-b||_2$
$latex \mathrm{subject\ to}\ l \le x \le u$

one can simply write the following lines of code in MATLAB:

10 cvx_begin
20 variable x(n);
30 minimize( norm(A*x-b) );
40 subject to
50 l <= x <= u;
60 cvx_end

For more information and documentation you may want to refer to the CVX Research page.

P.S.: One thing I’d like about Stephen Boyd is that all of his books and softwares are available online for free.

 Posted by at 11:05 pm
Mar 302012

I’ve decided to write some short posts about technical stuff from my work. I don’t have very clear idea about the things I want to write yet. But maybe it is better for me not to be very specific at the beginning to see how the things will go.

When this idea came into my mind, I though that it might be a little bit bizarre to write about technical stuff in a personal blog. Yes it can be! However I don’t think I am going to write very often, so it won’t be worth to start another blog! 🙂

P.S.: I’m in middle of writing my thesis; tired of writing, rewriting, and editing, so I’ve decided to start this small project as a refreshing task!

P.S.: I am not very good at writing in English, so your are more than welcome to correct my mistakes!

P.S.: I’ve added a new category named “Work” for these kind of posts.

 Posted by at 1:09 am
Nov 202010

1. Pointed by one of friends, I have found the lecture notes of Abbas El Gamal on Network Information Theory on arXiv. The first thing that impressed me was that it covers a lot of topics in Network Information Theory while it contains many of the recent results.

2. Finally, our paper titled “On the Capacity of Non-Coherent Network Coding” got accepted to IEEE Transactions on Information Theory and it will published in the special issue of “Facets of Coding Theory” which is a tribute to Ralf Koetter.

3. I am still working on the nightmare paper!

 Posted by at 10:30 pm