پایان نامه ارائه یک شاخص نوین برای سنجش سطح خستگی مغزی در حین فعالیت ذهنی از روی سیگنال EEG

فهرست:

فصل اول: مقدمه......................................................................................................................................

1

1-1- مقدمه ...............................................................................................................................................

2

1-2- تعریف مسئله ....................................................................................................................................

3

1-3- نگاهی به فصول پایان نامه....................................................................................................................

4

فصل دوم: پیشینه تحقیقات.....................................................................................................................

6

2-1- روش‌های موجود برای تشخیص خستگی ...........................................................................................

9

2-1-1- روش‌های مبتنی بر تحلیل طیف سیگنال EEG ..............................................................

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2-1-2- روش‌های مبتنی بر تحلیل تغییرات در آنتروپی سیگنال EEG ........................................

12

2-1-3- روش‌های مبتنی بر تحلیل نظم منطقی بین نواحی مختلف مغز.......................................

14

2-1-4- روش‌های مبتنی بر دادن تحریک به فرد در حین فعالیت.................................................

15

2-2- تاریخجه و نحوه ثبت سیگنال EEG....................................................................................................................

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2-3- جمع بندی ..................................................................................................................................................................

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فصل سوم: روش تحقیق...........................................................................................................................

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3-1- مقدمه ..................................................................................................................................................

22

3-2- نویزهای سوار شده بر روی سیگنال EEG و نحوه کاهش اثر آن‌ها .....................................................

23

3-2-1- امواج ناخواسته زیستی ....................................................................................................

23

3-2-2- امواج ناخواسته محیطی ...................................................................................................

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3-2-1- پیش پردازش ..................................................................................................................

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3-3- مدل سیگنال .......................................................................................................................................

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3-4- انتخاب الکترود مرجع ..........................................................................................................................

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3-5- مشخص کردن تعداد منابع تولید کننده سیگنال .................................................................................

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3-6- مکان یابی در فضای پرتوسازی ............................................................................................................

30

3-6-1- فیلتر کردن فضایی با محدودیت کمترین واریانس............................................................

31

3-6-2- مشکل روش LCMV........................................................................................................

35

عنوان                                                                                                              صفحه

3-6-3- روش پیشنهادی برای مکان یابی .....................................................................................

36

3-7- محاسبه همبستگی در سیگنال EEG ..................................................................................................

38

3-8- ویژگی استفاده شده برای تشخیص خستگی .......................................................................................

40

3-9- روش‌های کلاسه بندی استفاده شده ..................................................................................................

40

3-9-1- ماشین بردار پشتیبان ......................................................................................................

40

3-9-2- k نزدیک ترین همسایه ....................................................................................................

42

3-10- روش‌های مقایسه شده با روش پیشنهادی..........................................................................................

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3-10-1- آنتروپی تقریبی .............................................................................................................

43

3-10-2- کولموگروف آنتروپی.......................................................................................................

44

3-10-3- تجزیه و تحلیل بردار اصلی به همراه کرنل ....................................................................

45

3-10-4- مدل مخفی مارکوف.......................................................................................................

45

3-10-5- روش اراﺋﻪ شده توسط لیو و همکارانش .........................................................................

46

3-10-6- روش اراﺋﻪ شده توسط شن و همکارانش .......................................................................

46

3-10-7- توموگرافی الکترومغناطیسی با رزولوشن پایین ..............................................................

47

3-10-8- توموگرافی الکترومغناطیسی استاندارد با رزولوشن پایین ..............................................

48

3-11- جمع‌بندی .........................................................................................................................................

49

فصل چهارم: آزمایش‌ها و نتایج ..................................................................................................................

50

4-1- مقدمه ..................................................................................................................................................

51

4-2- شبیه سازی سیگنال EEG برای مشخص کردن دقت مکان‌یابی ........................................................

52

4-3- سیگنال EEG ثبت شده برای بررسی میزان خستگی .........................................................................

53

4-4- شبیه سازی سیگنال EEG برای بررسی میزان خستگی ......................................................................

57

4-5- نتایج ....................................................................................................................................................

59

4-5-1- مقایسه روش مکان یابی پیشنهادی و LCMV ................................................................

59

4-5-2- بررسی خستگی به کمک داده های ثبت شده  EEG.......................................................

60

4-5-2-1- بررسی مکان و قدرت منابع در حالت خسته و نرمال....................................

60

4-5-2-2- بررسی ویژگی پیشنهادی در کلاسه‎بندی حالت‌ها........................................

62

4-5-2- بررسی خستگی به کمک سیگنال شبیه‌سازی شده..........................................................

67

4-6- جمع‌بندی ............................................................................................................................................

70

فصل هفتم: نتیجه گیری و پیشنهادات ................................................................................................

71

فهرست منابع ..........................................................................................................................................

74

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