Study And Application On Knowledge Discovery Methods For The HB-LED Chip Manufacture Process

Knowledge discovery in databases is the advanced process of identifying valid, novel, potentially useful, and ultimately understandable patterns in data. Rough set theory is a new mathematical tool mat deals with vagueness and uncertainty. At present, the knowledge discovery method based on rough set theory has been one of the main methods of knowledge discovery.In this paper, the most research work focused on the application of knowledge discovery method in the manufacture process of HB-LED (High Brightness Light Emitting Diode) chip. Through analyzing and researching the manufacture process of HB-LED chip, and summarizing the knowledge of manufacture process, the architecture of Rough Sets based knowledge discovery system for the manufacture process of HB-LED chip was proposed How to realize the mining process was been studied, and a prototype system by which operator can input data, retrieve information about HB-LED chip process and discover knowledge was developed. The main work of this paper contained:1) First of all, the research background and the overseas and home research situation were analyzed, and the researching significance of knowledge discovery for the manufacture process of the HB-LED chip. The paper studied the fundamental principals of Rough Set based knowledge discovery, the concepts and methods which would be used, such as the discrete methods of the continuing attributes, the relative reduction and relative core, the dependability and significance of attributes were discussed, and attribute reduction based on Rough Set was also analyzed.2) Second, it analyzed the whole process of LED chip manufacture and the principles and characteristic parameter of key working procedures, then it was been defined that what the target data of knowledge discovery and knowledge types, and the decision-making of knowledge.3) Then the paper studied the application of the knowledge discovery model for LED chip manufacture process, knowledge discovery process was expounded,including the structure of Rough Set based knowledge discovery, the application of efficient methods of attribute reduction and value reduction, and how to obtain the rule knowledge and to express the knowledge.4) Finally, based of the study of theory and method, a prototype system of knowledge discovery for the manufacture process of the HB-LED chip was developed. Operator can input manufacture process, query and knowledge discovery. Finally, a practical example is given to verify its feasibility and practicability.