본 연구에서는, 오디오 신호 처리와 인공 신경망 기법을 통합하여 너트을 분류하고 등급을 매기는 방법이 도입되었다. 너트가 철판 디스크의 충돌로 인해 생성된 소리가 철판 디스크아래에 놓인 마이크에 의해 받아들여져 사운드 카드를 통해 PC로 전달되는 시스템이 설계되고 개발되었다. 또한, MATLAB 소프트웨어 프로그램에 의해 저장되고 처리되었다. 압전 센서와 회로는 추가적인 주변 소음을 제거하기 위해 사용되었다. 데이터의 시간 영역과 파장 영역 특징은 MATLAB 소프트웨어를 사용해 추출하고 인공신경망 툴박스를 이용해 분석했다.

제 1편 : MATLAB 기본편

1. MATLAB 기본사용편 ····················· 003
1.1 MATLAB 시작하기 ··························· 003
명령창(command Window)에서의 입력 005
도움말(Help)의 이용 ······························· 007
1.2 입력 오류의 수정 ····························· 008
계산의 중지 ············································· 009
MATLAB 종료하기 ·································· 009
1.3 연산과 변수의 할당 ························· 009
연산자 우선순위 ······································ 011
내장함수 ··················································· 012
1.4 데이터의 표현 ·································· 013
1.5 변수의 처리 ······································ 015
변수 이름 ················································· 015
clear 명령어 ············································· 016
특수변수와 정수 ······································ 017
whos 명령어 ············································ 017
1.6 벡터와 행렬 ······································ 018
벡터 ·························································· 018
행렬 ·························································· 023
스크린 출력과 억제 ································ 024
1.7 랜덤(Random)수와 복소수 ··············· 025
랜덤 수 ····················································· 025
복소수 ······················································· 027
1.8 기호를 이용한 연산 ························· 028
기호식에서의 치환 ·································· 029
1.9 코드 파일 ·········································· 030
스크립트 코드 파일 ································ 030
코멘트의 추가 ········································· 032
함수 코드 파일 ··································· 033
사용자 정의함수 ······································ 036
1.10 간단한 그래프의 생성 ··················· 037
ezplot을 이용한 그래프 ·························· 037
plot을 이용한 그래프 ························· 039
3차원 그래프 ··········································· 042
1.11 MATLAB과 엑셀(Excel)의 접속 · 043
엑셀 데이터 불러오기 ···························· 043
데이터 가져오기 옵션 ························ 046
스크립트 생성 옵션 ································ 049
함수 생성 옵션 ······································· 049
생성된 데이터를 엑셀파일로 저장하기 050

제 2편 : 연구논문
An Integrated System of Artificial Intelligence and Signal Processing
Techniques for the Sorting and Grading of Nuts

1. Introduction 51
2. Materials and Methods 53
3. Materials, Design, and Construction Method 54
4. Vector data with Microphone 58
5. Signal Processing 59
6. Results and Discussion 63
7. Conclusions 64
8. References 64