A Study on Logical Structure of a Text by using Selected Sentence Patterns and its application to Teaching Japanese as a foreign language

对于日语专业的高级学生来说，理解文本的潜在逻辑结构是非常重要的。因为逻辑结构能提高阅读和写作科技论文的能力，所以句型等项目能为理解文章的逻辑结构提供重要线索。本研究的最终目的是通过对所选句型的功能分析，阐明日语科技语篇的逻辑结构。作为实现这一目标的一步，我们选择了六种体裁的132个文本样本。这六种体裁是（i）经济学入门教科书，（ii）日本物理学会杂志论文，（iii）科学技术论文，（iv）日本文学论文，（v）4种报纸的社论文章，（vi）现代小说。我们统计了每个样本的62个句型的出现率（每句）。分析分以下两步进行：（a）我们首先检查上述62个项目的单变量分布，然后对132个样本（（i）16个样本（ii）24个样本（iii）14个样本（iv）24个样本（v）40个样本，通过随机抽样从222个样本（vi）14个样本中选择）应用典型判别分析。(b)其次，我们将同样的方法应用于3个样本（ii）、（iii）和（iv）），这些体裁在第一步中被称为“技术论文”，根据（a）的结果，这些体裁被分为14个句型（在62个中）以高的表观正确分类率（80%），在获得的结果（B）之后，明确地选择了区分3种体裁的词。这些结果表明，在具有明确逻辑结构的语篇中存在着共同的句型。

It is quite important for advanced students of Japanese-Language for Specific Purposes to understand the underlying logical structure of the text. Since the logical structure will enhance an ability to read and write technical papers.Such items as the sentence patterns can provide important clues for understanding the logical structure of the text. The ultimate goal of this study is to clarify the logical structures of the technical texts in Japanese by focusing on the functions of the selected sentence patterns. As a step toward achieving this objective, we chose 132 text samples of six genres. Those six genres are (i) an introductory economics textbook, (ii) papers of the Journal of the Physical Society of Japan, (iii) papers of science and technology, (iv) papers of Japanese literature, (v) editorial articles of 4 kinds of newspapers, and (vi) modern novels. We counted the rate of appearance (per sentence) of the 62 selected sentence patterns of each sample. The analysis was conducted in the following two steps, (a) We first examined univariate distribution of the above 62 items and then applied the canonical discriminant analysis to 132 samples ((i) 16 samples (ii) 24 samples (iii) 14 samples (iv) 24 samples (v) 40 samples selected by random-sampling out of 222 (vi) 14 samples). (b) Secondly we applied the same method to 3 samples (i.e. (ii), (iii) and (iv)) which were belonged to the same genre, so-called "technical papers" in the first step.According to the result obtained (a), these genres are classified with 14 sentence patterns (out of 62) at a high apparent correct classification rate (80%), Following to the result obtained (b), the words which distinguished 3 genres were clearly selected. These results indicate the existence of common sentence patterns in texts having an explicit logical structure.