1.What's data warehouse?

    Data warehouse (DW) is a database used for reporting and analysis. DW maintains its functions in three layers: staging, integration, and access. Staging is used to store raw data for use by developers. The integration layer is used to integreate data and to have a level of abstraction from users. The access layer is for getting data out for users. It's now widely used in all kinds of careers.

2.The features of DW

    One of the most…

    The course database is the most special one I have taken so far in THU.It's the first course I've taken that indeed gives students a chance to be lecturers on the stage. And we all proved that we deserve the trust. Now the course ends, what I can proudly show to others includes an instructive vedio teaching SQL,a plugin of wordpress called iCalorie with an advertisement selling it. Moreover, our team wrote a booklet of our product in terms of compatability, fault tolerance, query…

1.The error-tolerance design &  the fault-tolerance design

    An error-tolerance design is one that unduly penalizes user errors. Also, there is another concept called fault-tolerant design, which aims at allowing equipment to continue functioning in the presence of hardware faults. 

     We did implemented the error-tolerant design. For instance, if the user inputs wrong password when he logs in, a message box will pop up to remind him of the mistake,…

• What's Arduino?
  
  Arduino is an open-source single-board microcontroller, designed to make the process of using electronics in multidisciplinary projects more accessible. The Arduino board is shown as the following picture. Arduino hardware is programmed using a Wiring-based language similar to C++. It is intended for artists, designers, and anyone interested in creating interactive objects or environments.

 …

        Up to now, we have acquired much knowledge related to database system. We have had a basic understanding of SQL, relational model, E-R model, system design, XML, system design and application, transactions and so on. But, with all of them grasped, can we have a better understanding of ourselves? Is database related to our daily learning activities? Can we interpret human brain with the viewpoint of database? These questions are quite interesting and attractive. Now, I will explore…

When developing our plugin for Wordpress, an idea occurred to me that why not develop an 

apk for my android cellphone? I read a lot about development with Android SDK, and so far, 

I‘ve prepared the environment for development and tried some sample apks. It is so thrilling 

that it kept me awake and playing with it the whole night.

 …

       I want to talk about my experience and gain last week first. Last Saturday, 

PHP…

ⅠMathematica

Mathematica is a software with fascinating user interface and powerful data manipulation. It can deal with numbers, strings and graphs. I did the data visualization part of our lecture this week, and here are some tips for quick learning Mathematica that might be helpful.

Tips:

1. Installing Mathematica 7.0 is easier, because it’s kind of hard to find registration code generator online for the latest version Mathematica 8.0, at least for me.

2.…