• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.05a
• /
• pp.391-394
• /
• 2002

This paper introduces that the lathe optimize for main and sub spindle's synchronous in Opening-CNC. In view of optimal design, the mathematical modelling and the frequency domain analysis of spindle's system are performed. For the compensation of synchronous error in compounded manufacture process, the optimization method of motor drive's control parameter and the related parameter is proposed. By the experiment in prototype machines using the server/client program, the validity of the proposed method is verified.

• Journal of the Korea Furniture Society
• /
• v.12 no.2
• /
• pp.51-59
• /
• 2001

Opening 21th Century, all the Countries of the world has been focusing on build up the foundation of cultural infrastructure in a various way, since the awareness of importance for cultural design products has been turnover. On the other hand, our cultural crafts＇ industry has not escaped from poor working environment and lagging behind conventional product system, and yet there is no complete system for mass production. The study is collaboration with Tourism Industry Innovation Center in Kwangju University for development of cultural products of wooden crafts by using cultural resources in Kwangju area and CNC M/C which is up-to-date digital technology. It aims to make possibility of mass production and discrimination on design for wooden crafts which is based on highly skilled technical manpower and creativities, and expects to develop and merchandise global wooden cultural products.

• Journal of the Korean Society for Precision Engineering
• /
• v.20 no.3
• /
• pp.74-81
• /
• 2003

This paper introduces that the turning center optimizes main and sub spindle's synchronized controller in Open-CNC. In view of optimal design, the mathematical modeling and the frequency domain analysis of spindle's system are simulated. For the minimizing of synchronized error in each spindle's speed, the study of control method and the related control parameter is proposed. By the experiment in prototype machines using the server/client program, the validity of the proposed synchronous error's compensation method is verified.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.1
• /
• pp.45-50
• /
• 2012

This paper on analysis of roundness error after boring turning of Al-6061 materials with CNC lathe. Experiment applying turning parameters is based on experimental design method. A design and analysis of experiments is conducted to study the effects of these parameters on the roundness error using the S/N ratio and analysis of ANOVA. Multiple linear regression analysis is applied to compare experimental with predicted data in consideration of roundness error. To fixation pressure and the opening which are a turning parameter, the cutting depth and feed speed respected the objective attainment of dissertation and to be applied the result they investigated.

• Transactions of the Korean Society of Machine Tool Engineers
• /
• v.15 no.3
• /
• pp.104-110
• /
• 2006

It is a study on the design of a cam profile for diesel engine SOHC. It is used a reverse engineering method without the usual copy processing. It draws up the contour data from an actual cam and processes by CNC. The profile of the cam is reappeared to be up to operational specifications that are the opening and shutting time, lift, speed and acceleration of the inhalation and escape valves. While the cam operating, the noise and vibration are occurred by the sudden change of speed. The new design of cam profile is suitable fur the valve operations to be smooth. We propose the design method of a cam profile far the reappearance of an actual cam. It is proved to be the propriety about the design of the cam profile through the processing, measurement, and comparison of the cam profile.

• The Journal of Korean society of community based occupational therapy
• /
• v.3 no.2
• /
• pp.33-46
• /
• 2013

Objective : The purpose of this research is to discuss on comparative assessments between virtual reality and task-oriented programs of balance for elderly. Method : 12 healthy elderly for each program are received twice a week for 6 week period. Changes in balance ability were assessed using Berg Balance Scale (BBS), Timed Up and Go(TUG), One-Legged Stance Test(OLST) and 5 - Repetition Sit-To-Stand test(5R-STS test). Result : All groups were not statistically meaningful differences between pre- and post-program. However, comparative outcomes among three groups were statistically significant in opening the eyes of One-Legged Stance Test(OLST) from the left and right side, and Berg Balance Scale(BBS). In post hoc, shows a statistically significant in both programs with opening the eyes of One-Legged Stance Test(OLST) from left side. Conclusion : Task-oriented programs is more useful and effective clinical methodology for balance excise programs for elderly. In addition, this clinical trial may be easily implemented by elder care facilities.