• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 추계학술대회 논문집
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• pp.129-130
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• 2007

• 한국정밀공학회지
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• 제26권12호
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• pp.55-61
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• 2009

Machining systems have been evolved to produce more detailed products of high added value. This has been possible, in large part, due to the development of highly accurate multi-axis CNC machine tools. The conventional CNC of machine tools has individual axis controllers to maximize tracking performance. On the other hand, cross-coupling controllers can be integrated into the conventional CNC to enhance contouring performance. For this multi-axis cross-coupling control system, it is necessary to automatically adjust the controller gains depending on operating conditions and/or other external conditions from an optimization perspective. This paper proposes automatic modeling of feed drive systems that minimizes the difference in behavior between the system model and the actual system. Based on the modeling, an integrated auto-tuning method is also proposed to improve both tracking and contouring accuracy of a 3-axis cross-coupling control system as well as users' convenience. The proposed methods are evaluated by both simulation and experiments.

• 한국의류학회지
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• 제23권3호
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• pp.471-482
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• 1999

This study examined the effect of abolition of school uniform on personality. The subjects were 317 boys(mean age : 18) and 312 girls(mean age : 18) in third grade of high school. the subjects were selected from 4 uniform high schools and 4 free-choice wearing clothes high school in which were situated at north and south part of Han-River in Seoul. They wee administered with the following questionnaires to measure the creativity individuality self-efficacy. conformity of behaviour conformity of attitude autonomy and responsibility. Results indicated that (1) the effect of abolition of school uniform on personality must be considered in the moderator effect of the preferred clothes of students. These results were discussed and its implication and following study were suggested.