The relationship between the sound changes of Japanese and the nativization process of Sino-Japanese.

本研究的主要目的是探讨日语语音变化与汉语借词本土化过程之间的关系，主要研究Vu序列中的元音合并。我们注意到Au，on和Iu，eu之间的区别。以往的研究多认为，日语中的sya、gyu、tyo等CjV序列是借用了汉语中音节结构复杂的词而产生的，而汉语中的CV音节结构相对于古日语中的简单CV音节来说是非常复杂的。然而，CjV序列甚至是由发生在本地单词中的iu>ju：和eu>jo：的变化带来的。这些现象表明，CjV音位结构是在比以往所设想的更为复杂的历史背景下建立起来的。本研究关注的是本土化系统与外来词本土化的相互关系，关注音变与汉日的关系，在解读历史书面文献时发现音变因素同样重要。同样的观点在考察外来词中的“连答”的历史时也起着重要的作用。

The main target of this research is to investigate into the relationship between the sound changes of Japanese and the nativization process of Chinese loanwords.We deal primarily with the vowel coalescences in Vu sequences. We notice the differences between au, on and iu, eu. The latter sequences have changed into ju :, jo :, respectively.The previous studies quite often say that the Japanese CjV sequences such as sya, gyu, tyo emerged as a result of borrowing the Chinese words that have strikingly complicated syllable structures compared to the simple CV syllables of Old Japanese. However the CjV sequences were brought even by the changes iu>ju : and eu>jo : which took place in native words. These phenomena suggest that CjV phonotactics established under the more complicated historical context than was assumed before. In this research, we focus on the mutual relation of the indigenous system and the nativization of loanwords.Paying attention to the relationship between sound changes and the Sino-Japanese is equally significant when we detect factors of sound changes by interpreting historical written documents. The same viewpoint also plays an important role when we examine the history of rendaku in loanwords.