1. CSCE101 –Chapter 8 Thursday, November 30, 2006

2. Compression MP3 players – MP3 is a compression technology that reduces the size of an audio file to 1/10 of the original size.

3. Compression Digital Cameras –Quality output – jpg compression 83261B 9553B 1523B

4. Compression –Lossless compression – uses mathematical techniques to replace repetitive patterns of bits with a coded summary –Lossy compression – techniques that permanently discard data during compression Multimedia data Internet Telephony Most lossy compression data suffers from generation loss Two lossy file formats are.jpeg and mpeg

5. Chapter 8 Different types of data files Database Management Systems handle an organized collection of files Newer DBMS can accommodate muiltiple file types DBMS store text data in following format: –Basic concepts: bits, characters, fields, key fields, records, tables

6. Chapter 8 Reduced data redundancy Improved data integrity Increased security Ease of data maintenance

7. Three database components Data Dictionary – repository or meta data DBMS utilities are programs that allow one to maintain the database Report generator

8. 8.3 Database Models Hierarchical Network Relational Object-oriented Multidimensional

9. Data Mining Data sources Data cleansing & fusion Data & meta-data Data transport to the data warehouse

10. Information Systems Office Information Systems Transaction Processing Systems Management Information Systems Decision Support Systems Executive Support Systems Expert Systems

11. Experts System Components End user, problem domain expert, knowledge engineer Components of an expert system –Knowledge Base –Inference Engine –User Interface