The purpose of this study is to examine phonetically if the spelling errors produced by foreign Korean learners are related to learners’ pronunciation by analyzing the pronunciation of plain, tense, and aspiration sounds of foreign Korean learners using a Praat. A statistical analysis was performed on the listening, reading, and writing data produced by 18 foreign university students at the beginner level. The results are summarized as follows. First, foreign Korean learners accounted for the majority of errors in plain and aspiration sound among initial obstruent words. This can be interpreted as an extremely strong or very weak pronunciation of the word, because learners do not properly recognize the intensity of range in plain sounds. Second, the more accurate the learner’s perception was, the more accurate production can be made. Statistically, it was found that the production rate increased by 0.178 each time the perception rate increased by 1. Therefore, the correlation between perception and production is established. Third, the relationship between pronunciation and spelling is a relationship that increases by 0.652 each time the pronunciation increases by 1. It can be explained that there is a possibility that the learner may often write words as they pronounce them.

To research the cause of the low and the poor visibility phenomena of Kimhae international airport statistically, we analyzed the field routine data for the last five years from 1985 to 1989. The poor visibilities below l㎞, 3㎞, and 5㎞ usually occurred at about 6 o`clock in the morning under the condition of calm or light wind from south to southwest direction, and lasted for from 1 to 3 hours. They were caused by the radiative cooling and the inflow of moisture from the South Sea. The frequency of the low visibility(below 9㎞) recorded 48.1% a year. And the low visibility below 8㎞ with relative humidity below 70% often occurred in the case of southeast, southwest, and northwest wind. And it reveals a peak at 11:00 a.m.. It is supposed to be caused by the pollutants flowing from the neighbouring industrial complex, Sasang, Jangnim and by the photochemical reaction. And, when the industrial complex is built in Sinho, Myongji, Noksan located southwest, and Changyu area located northwest direction from Kimhae international airport, the visibility and the air pollution may become worse and worse by the increased pollutants.