1. DATA MODELING
AND
eXERD
R&D Center
in Tomato
System

2. LIST
1. Data Modeling
2. Data Base Modeling
3. Data Base Modeling Tool
4. eXERD

3. COMPUTING
 Realize the problems of reality.
 Reconstitute and solve problems with the computer.
 Revert added value of solved problems to reality.

4. COMPUTING: CONTINUE…
 How long does it take from Seoul to Busan By a car?
 It takes 4.3 hours!

5. DATA MODELING?
simplify, visualize, document
information of reality for computerization,
 is to
deciding the scope of
 UML, ERD, CRC…
 ERD is one of notation.(?)
abstraction

6. ABSTRACTION: INFORMATION CHOICE
Abstraction is the process of deleting differences
for emphasis on commons,
Hiding unimportant parts or not interesting objects,
Including the distinguishing parts from other objects.
-Dictionary of Object Technology (Firesmith, Eykholt, 1995)
 Entity: Marine




Stamina
Defensive Power
Attack Power
Shooting Range
 Annual Salary?
 Age?
 Family History?

7. ABSTRACTION: THE BASIS OF ACTIVITIES
IF
DISTANCE_WITH_ENEMY < ATTACK_RANGE
THEN
ENEMY.HP = ENEMY.HP – ATTACK_DAMAGE
ENDIF
 Modeling justifies the form of problems and results which
business logic should solve.

8. ABSTRACTION: DISTORTION

9. ABSTRACTION: VIEWPOINT

10. ABSTRACTION: RELATIONS
 Personal information







Name
Age
Phone
Name of
Name of
Name of
Name of
a mother in law
a father in law
a wife
children
father
wife
children
mother

11. MODELING: SUMMARY
Selecting data suited for duties(domain)
Change data to be suited more for duties
Each entities compose the cooperation
relation for duties

12. DATABASE MODELING




How is data preserved in the computer?
Which data phase is suitable for problem solution?
Is it working fast in actual data base?
Is it assured of matching?

13. DATA MODELING TOOL
 The drawing language of database modeling, the tool to draw
ERD
 And?




Engineering, Reverse Engineering
Pursue matching
Access to specialized function for database
…
 eXERD?
 It offers practical working environment for everyone

14. DATABASE MODELING TOOLS IN KOREA
ERwin
Dataware (Old ver. DA#)
eXERD

15. PRICING

16. ERWIN: THE REASON WHY IT IS
EXPENSIVE
There are too many functions of details.
It’s designed for experts.
Monopolistic position
De Facto

17. eXERD?
 The modeling tool for 99% people





Low expense of education markedly
Mechanism to prevent mistakes
Sensible exchange of data with animation
Integrates tools(Eclipse)
Reasonable price
 Humanism




Joys
Excludes mechanical and repetitive works
Automates styling works
Inline editing: it excludes works to be needed with your mouse and
keyboard at the same time.

18. DEMO

19. USERS’ FEEDBACK
It makes me smile while I’m working busy
I’m surprised that Korean development
tool based on mac has high quality
I feel thankful for making this brilliant tool
I’m embarrassed of my thoughts that developers
have to use famous and expensive ERD
tools. Thanks a lot, it wakes me up to rethink
I would pay your tribute of praise to encouraging first step

20. THANK YOU