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영어

The JIT system was developed at the Toyota Motor company in Japan. The modern application of JIT was populized in the mid 1970s at Toyota by Mr. Taiichi onno, a Toyota Vice President and its concept was transferred to the United States about 1980. The basic idea behind the Toyota production system is to produce the necessary units in the necessary quantities at the necessary times, that is, Just-In-Time. In order to realize the Just-In-Time ideal, a Kanban system, as an information system to control production, should be developed. To implement the Kanban system, smoothing of production must be realized by minimum lot size ordering. In the JIT system, it is necessary to look at the production flow conversely; in other words, the people of a certain process go to the preceeding process to withdraw the necessary units in the necessary quantities at the necessary time. Then what the proceeding process has to do is produce only enough quantities of units to replace those that have been withdrawn. The Kinds of production management systems that are applied to the type of production and business in the Korean production enterprise are surveyed. To analyze the difference of production management system applied to its groups, Chi-square test are adopted to analyze the introduction effect of JIT system according the groups. The results that are derived by the surveyed data in the Korean enterprises are as followed; first, introduction of the JIT system doesn`t have significant difference for the type of production management, but has significant difference for the type business. Secondly, the factors that have significant difference about JIT system effect are support degree of top management, level of vendor, level of JIT system, skill level of workers, proceeding years of JIT introduction and assembly set-up time. Thirdly, the level of JIT system has very significant correlation with the effect of JIT system, particularly with the cost reduction, morale of workers, work-in-process inventory and operation degree of managerial techniques.