Of course, it is not the case that only the analysis and theory of speech sound were scientific and original. The principles of xiangxing(象形, imitation or representing) and adding stroke(加劃) adapted to determining the graphic shapes could also be equally estimated. If this is so, where in the world did the scientific nature and originality originate? So far many scholars have been anxious for it, and the author thinks that its investigation is the most significant work.

In relation to the scientific principles of making graphemes, especially the analysis and theory of speech sound in the 15th century, never inferior to that of modern linguistics, it was the Chinese phonology(聲韻學) that had attracted many scholars in the past. They thought that only the Chinese phonology could be referred to at that time, and they actually found the terms of the Chinese phonology in ?Hunmin-Jeongeum?. Thus the general idea that the theory of Hunmin-Jeongeum was developed by introducing and originally improving the Chinese phonology for Chinese speech sounds, had been widely spread. Later it often became the presupposition of other discussions.13)


It must have been an opinion of common sense in consideration of the background at that time. However, just as the common idea that all writing systems were derived from existing ones fails to be true only of Hangeul, so a seemingly natural thing could be not true in some special cases.

It seems that as there were many difficult terms of the Chinese phonology and philosophy, the founding principles of Hangeul were supposed to be highly abstract and very difficult. But the making principles of Hangeul are never abstract or difficult. The concrete principles such as the basic idea that they wholly reflect the phonetic distinctions on graphemes, xiangxing, and adding stroke, etc. cannot be said to be a high-level theory. In other other words, it was only a kind of common sense, rather than the specialized and distinguished knowledge that made them possible. Thus, it is necessary for the analysis of the making principles to be made on an easy level first. It often happens that many problems, easily solved by an easy approach, could not be solved by a difficult and complex approach.

It is very difficult accept and understand correctly a foreign academic theory. Just as modern scholars find it difficult to accept and practice various Western theories, so the Chinese phonology was hard to learn for Korean scholars in the 15th century. If this is so, it must be hard work to import a foreign theory and to improve it, and finally to develop an independent theory like a trichotomy of a syllable. It might be an astonishing achievement, but the problem lies in its verification.

The attempt to look for the background of a syllable- trichotomy only in the Chinese phonology, is an example of people making a difficult problem more difficult. It is necessary to change the existing viewpoint or to review the validity of its presupposition when a right solution cannot be easily found. The author thinks that this flexible attitude is needed also in the case of the origin of a syllable-trichotomy, which was the core of the founding principles.
In relation to the theory of speech sound including a syllable-trichotomy, it is necessary to present a more fundamental question before we investigate the origin of such a theory: Why they started to study speech sound in inventing new graphemes. This question has an answer. We cannot but think that they studied speech sound and adapted the result to inventing graphemes with a view to making a writing system representing sound(=a phonetic alphabet) and reflecting sound features on the shapes of graphemes. Further, it is necessary to investigate the source of two conclusions.

As was mentioned, it is an almost common and ordinary idea to invent a new writing system based on sound symbolism and to reflect various distinctions proper to sound in graphic shapes, rather than a highly elaborated theory. Yet no one can hit upon the idea without effort. The conclusion that a writing system with sound symbolism is needed for the complete writing of Korean could only be brought about from practical experience, rather than from a high-level theory. Therefore, seen from a viewpoint of an experienced man, these conclusions become ordinary only, but seen from a viewpoint of an unexperienced man they become insoluble enigmas.

13) Even today that kind of opinion can be supposed to be the most general one. In most of references related to Hunmin-Ch?ng'?m it can be ascertained.
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