The Snows Of Tehran…

“It doesn’t matter how slowly you go, so long as you do not stop“.->’Confucius‘

+ The winter is calling.This year in tehran,we are watching a beautifull outlook of snow and fog,although it causes a terrible traffic on city roads but we can see it as a trade off.Cheery days replace boring days !

+  After completing Sbu Skin Research Center Project, i had two new proposals: one is a similar CMS for a new developed research center and another is a personal website for a famous Doctor.I don’t know whether accepting these new projects is reasonable regarding to my conditions! I have only 2 months to prepare for Master of  IT exam! I don’t want to leave profit of these works but i cann’t leave my future,too! It’s a trade off,too!

+ I forgot to wish you the best year! Merry Christmas  When a new year comes,i want to review my old going days and i want to review dreams of my new incoming days! One of my wishes in new year is learning to work with a new and non-windows operating system such as UNIX and specially Mac OSX. Did you hear Lots of people like BL Ochman are screaming bloody murder about Microsoft giving bloggers and other influentials free laptops loaded with Windows Vista!  I am also trying to dive into a well formed web developing framework that includes both cilent-side and server-side tools such as RUBY ON RAILS. Zend Framework is growing on and has a huge web services movement,I wish to be a Zend Certified Engineer and MySQL DB administrator in new year! The time is gone and the song is over…

Sleeping on the problem!

People are always blaming their circumstances for what they are.
I don’t believe in circumstances. The people who get on in this world are
the people who get up and look for the circumstances they want, and, if they
can’t find them, make them.
‘George BernardShaw’

Today I spent many times designing a database for my database lab project.It’s very hard to Model a part of real world environment for a virtual world application with limited facilities.
ER(Entity Relation) diagram is a good tool but not complete in understanding.
Joe Celko writes in his book(Data and Databases: Concepts in Practice)  :
‘There are several problems with ER modeling:
1.ER does not spend much time on attributes. The names of the columns in a table are
usually just shown inside the entity box, without datatypes. Some products will
indicate which column(s) are the primary keys of the table. Even fewer will use
another notation on the column names to show the foreign keys.

2.Although there can be more than one normalized schema from a single set of
constraints, entities, and relationships, ER tools generate only one diagram. Once
you have begun a diagram, you are committed to one schema design.

3.The diagram generated by ER tools tends to be a planar graph. That means that
there are no crossed lines required to connect the boxes and lines. The fact that a
graph has crossed lines does not make it nonplanar; it might be rearranged to avoid
the crossed lines without changes to the connections

4.ER diagrams cannot express certain constraints or relationships. For example, in the
versions that use only straight lines between entities for relationships, you cannot
easily express an n-ary relationship (n > 2).’

Sleeping On the problem is one of the concepts that i found in theory of management ,It’s very interesting 

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yesterday was birthday of my brother’s beautiful girl.It was a cold snowy night!
When i first saw the tiny baby with only 2.9 Kilogram weight,i were very excited! it was wonderfull!
Now i am an uncle! i wish the best for my little nice , SABA