How to express categorized items in relational tables

I'm novice in database world.
Now I have to make design a database where categorized items should be
stored. It resembles the structure something like seen in Yahoo.

Thanks for reading and generous comments of yours.

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Doo Suk Yang
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LG Chemical Ltd. Research Park
Biotech Research Institute I                    FAX:   82-42-861-2566
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