We discussed:

Abstraction and Information Hiding
Levels of Abstraction
Forms of Abstraction
A Short History of Abstraction

Here are the slides:

http://docs.google.com/present/view?id=dc7f6bh9_32g3tkmqcb

Since the Google Docs Presentation could not be embedded into Wordpress blogs, I created a Slideshare.net account today and uploaded the slides. It looks good.
CSCI 383 Lecture 3 and 4: Abstraction
View more documents from JI Ruan.

It would be great if I [...]

I have only a Chinese version yet: #lvba #greendam
当GFW遭遇微博客（1）
In this first article, I try to analysis the huge impact of the uprising of micro-blogging  services towards the Great Firewall (GFW), which is created by the Chinese government to censor the Chinese Internet. My website was blocked by the GFW from August 2008 to May 2009, [...]

This BBC news article says it is about a video, and I find it here:
http://media.phayul.com/?av_id=147&av_links_id=323
http://www.youtube.com/watch?v=xiZL9zvQ3Sc
Speechless.
When you are blocking information sources without a good reason, we tend to think you are hiding the truth.

Here is a detailed report on how the Internet was controlled by the Chinese government. 
Journey to the heart of Internet in China (Download pdf version). 
Since I believe that  in order to build a better society, it is extremely important to let my fellow citizens to have free access of information, I will spend a big portion of [...]

It means that most of the people in China could not ’see’ my website anymore. There is something called the Great Fire Wall(GFW) which is used by our government to censor the Internet.You could do your own test by following this link: http://www.websitepulse.com/help/testtools.china-test.html