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Research on Thai Transliteration Input Method for Thai Language

作　者: Rachata Watthanawong
导　师: 张菁
学　校: 哈尔滨工程大学
专　业: 计算机应用技术
关键词: Natural Language Processing Input Method Transliteration
分类号: TP391.14
类　型: 硕士论文
年　份: 2011年
下　载: 7次
引　用: 0次
阅　读: 论文下载

内容摘要

The current Thai input methods cannot respond the desire to the input method for the future mobile phone and other device which will come. Almost current Thai input methods are direct mapping method. They are inconvenient and difficult to remember the position of input keys. This research provides Thai transliteration method, a new input method for Thai language. Thai transliteration input method of Thai letters is by means of the Roman letters that represent the Thai pronunciation. The benefit of it is improving the typing operation for non-native Thai speaker or people who accustom to only Roman keyboard.There are five key researches in this paper. Firstly, study the input method in Thailand consists of input method on computer and mobile phone. And introduce the input method in East Asian language such as Chinese, Japanese and Korean including the predictive entry based on phonetics. Secondly, represent on Transliteration rule for Thai language and create new Thai transliteration rule for input method. Thirdly, study the principle of N-gram models for transliteration method of Thai and modify the N-gram model for predicting the text entry based on phonetics and dictionary. Fourthly, study on decoding method including Viterbi algorithm and A* decoding. In addition, put forward an improved decoding method using Dynamic A* Decoding for input method. Finally, create the dictionary and implement the Thai input method software by using C++language and Qt framework.

全文目录

Abstract  5-11
Chapter 1 Introduction  11-16
  1.1 Background of Problem  11
  1.2 Research Status  11-13
  1.3 Project Aim  13
  1.4 Project Scope  13-14
  1.5 Project Schedule  14
  1.6 Thesis Organization  14-16
Chapter 2 Lite rature Review  16-34
  2.1 Input Method in Thailand  16-19
    2.1.1 Input Method on Computer  16
    2.1.2 Input Method on Mobile Phone  16-19
  2.2 Input Method in East Asian Language  19-28
    2.2.1 Chinese  19-21
    2.2.2 Japanese  21-22
    2.2.3 Korean  22-23
    2.2.4 Predictive Entry Based on Phonetics  23-28
  2.3 Transliteration of Thai Language  28-33
    2.3.1 Royal Thai General System of Transcription  28-31
    2.3.2 Anglicization  31-32
    2.3.3 ISO 11940  32-33
  2.4 Summary  33-34
Chapter 3 Methodology  34-55
  3.1 N-gram  34-35
  3.2 Probabilistic Models of a Word Sequence  35-40
    3.2.1 The Maximum likelihood Estimation  35-37
    3.2.2 Using ML Estimates with Nineteen Eighty-Four  37-40
  3.3 Linear Interpolation  40-41
  3.4 Decoding  41-54
    3.4.1 The Viterbi Algorithm  41-45
    3.4.2 A~* (Stack) Decoding  45-49
    3.4.3 Dynamic A~* (Stack) Decoding for Input Method:My Improved Method of A~* Decoding  49-54
    3.4.4 Heuristic Functions  54
  3.5 Summary  54-55
Chapter 4 Implementation  55-67
  4.1 Technology Environment  55
  4.2 Input Method Event  55-58
  4.3 Dictionary  58-59
  4.4 Training Set and Test Set  59-60
  4.5 Define Constance Value in Linear Interpolation  60-61
  4.6 Implement Composing Process with A~* Decoding  61-63
  4.7 Implement Composing Process with Dynamic A~* Decoding  63-66
  4.8 Summary  66-67
Chapter 5 Implementation Results  67-72
  5.1 The Experiment Results  67-71
  5.2 Summary  71-72
Conclusions  72-73
Bibliography  73-79
Appendix A Thai Script  79-82
  A1 Consonants  80
  A2 Vowel  80-81
  A3 Tone  81
  A4 Diacritics  81
  A5 Digit  81
  A6 Typographical Symbols  81-82
Appendix B Transliteration Rule  82-85
  B1 Initial Consonants  82-83
  B2 Final Consonants  83
  B3 Vowels  83-85
Acknowledgement  85

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