| ACKNOWLEDGEMENTS | 第5-6页 |
| ABSTRACT | 第6-7页 |
| 摘要 | 第8-13页 |
| CHAPTER ONE INTRODUCTION | 第13-17页 |
| 1.1 Research topic | 第13-14页 |
| 1.2 Definition of OCRs and review helpfulness | 第14-15页 |
| 1.3 Research rationale | 第15页 |
| 1.4 Research questions | 第15-16页 |
| 1.5 Organization of the thesis | 第16-17页 |
| CHAPTER TWO LITERATURE REVIEW | 第17-26页 |
| 2.1 Previous studies of helpfulness of OCRs | 第17-24页 |
| 2.1.1 Influence factors of helpfulness of OCRs | 第18-19页 |
| 2.1.2 Effect of reviewer’s characteristics on review helpfulness | 第19-21页 |
| 2.1.3 Methods of evaluating or predicting review helpfulness | 第21-23页 |
| 2.1.4 Other perspectives and approaches | 第23页 |
| 2.1.5 Summary | 第23-24页 |
| 2.2 Previous studies of AT’s application in OCRs | 第24-26页 |
| CHAPTER THREE THEORETICAL FRAMEWORK | 第26-43页 |
| 3.1 The framework of Appraisal Theory | 第26-40页 |
| 3.1.1 The system of engagement | 第28-33页 |
| 3.1.2 The system of attitude | 第33-39页 |
| 3.1.3 The system of graduation | 第39-40页 |
| 3.2 Appraisal Theory as a theoretical foundation | 第40-43页 |
| CHAPTER FOUR DATA AND METHODOLOGY | 第43-47页 |
| 4.1 Methodology and data collection | 第43-44页 |
| 4.2 Research procedures | 第44-45页 |
| 4.3 Two examples of annotated text | 第45-47页 |
| CHAPTER FIVE RESULTS AND DISCUSSIONS | 第47-60页 |
| 5.1 The distribution and frequency of appraisal resources | 第47-56页 |
| 5.1.1 Overall result | 第47-49页 |
| 5.1.2 Engagement resources in helpful positive and negative OCRs | 第49-52页 |
| 5.1.3 Attitude resources in helpful positive and negative OCRs | 第52-53页 |
| 5.1.4 Graduation resources in helpful positive and negative OCRs | 第53-55页 |
| 5.1.5 Summary | 第55-56页 |
| 5.2 The distribution of appraisal resources and review sentiment | 第56-58页 |
| 5.3 The distribution of appraisal resources and helpfulness of OCRs | 第58-60页 |
| CHAPTER SIX CONCLUSION | 第60-63页 |
| 6.1 Findings of the thesis | 第60-61页 |
| 6.2 Limitations of the present study | 第61-62页 |
| 6.3 Suggestions for further studies | 第62-63页 |
| REFERENCES | 第63-67页 |
| APPENDIX | 第67页 |
