1. Topic 3 Grey System Theory

2. Ming-Feng Yeh3-2 1. Introduction Grey system theory was initiated in 1982 by Julong Deng. The systems which lack information, such as structure message, operation mechanism and behavior document, are referred as grey systems. A Grey system means that a system in which part of information is known and part of information is unknown. Grey: poor, incomplete, uncertain, etc.

3. Ming-Feng Yeh3-3 Goal of Grey System In general, the analysis of system characteristics is based on the statistical model which finds the statistical properties between data in a large sample set. A large sample set is not that easy to be available; therefore, many systems are said in a status of poor information. The goal of grey system and its applications is to bridge the gap existing between social science and natural science.

4. Ming-Feng Yeh3-4 Essential Topics Grey relational space Grey generating space Grey forecasting (grey modeling) Grey decision making Grey control Grey mathematics Grey theory