CSCE101 –Chapter 8 Thursday, November 30, 2006. Compression MP3 players – MP3 is a compression technology that reduces the size of an audio file to 1/10.

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Presentation transcript:

CSCE101 –Chapter 8 Thursday, November 30, 2006

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

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

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

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

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

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

8.3 Database Models Hierarchical Network Relational Object-oriented Multidimensional

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

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

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

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