• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.101-101
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• 2003

• Proceedings of the Korean Nuclear Society Conference
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• 2003.05a
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• pp.129.1-129.1
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• 2003

• Journal of the korean Society of Automotive Engineers
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• v.22 no.1
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• pp.66-70
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• 2000

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.3
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• pp.41-46
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• 2008

Generally optical components are fabricated by grinding, lapping and polishing processes. Those processes take long time to obtain optical high surface quality. In the case of large optical components, the on-machine measurement is strongly recommended because the workpiece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm mechanism which can be used for on-machine measurement of a surface profile with a sensing probe end-effect, and also for grinding or lapping the surface with a corresponding tool. The measuring accuracy and uncertainty using a swing arm type profilometer have been studied. The experimental results show that this method is useful specially in lapping process with the accuracy of $5{\mu}m$. Those inspection data are provided for correcting the residual figuring error in next processes.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.1221-1224
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• 2004

In this study, we developed a method classifying slice shot during golf practice using backpropagation algorithm. The 144 data based on the backpropagation model(11 inputs, 2 outputs) was used as a learning set and the model was verified based on the extra 50 data in the process to predict a slice shot in golf swing. The results showed 100％ separating rate of learning set and 91.5％ separating rate of verified set. The developed method can be potentially beneficial for the predicting of slice shot in an indoor golf excercise setting without applying any additional equipment.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.15 no.6 s.99
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• pp.660-666
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• 2005

Recently, the need for subminiature storage systems has increased with the diversification of portable devices. An actuator for small optical disk drives has to satisfy performance requirements such as higher access speed, lower power consumption, and smaller size. In this paper, we proposed the miniaturized rotary type VCM actuator that had an effective focusing mechanism and secured sufficient bandwidth for small form factor (SFF) optical disk drive (ODD). Initial model was designed by electromagnetic (EM) and structural analyses. Such a model was improved using design of experiments (DOE) procedure based on a Blu-ray disk (BD) 1x specifications.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.864-867
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• 2011

본 논문에서는 드럼연주에 있어서 라이드 심벌 비트(ride cymbal beat)를 중심으로 현대 재즈리듬과 폴리리듬과의 연관성에 관하여 생각해 보고자 한다. 현대는 아주 다양한 장르의 음악들이 서로서로 영향을 주고받고 있기 때문에 다양한 음악을 수용하는 특징을 가지고 있는 재즈에서의 리듬은 어느 한 가지로 단순히 정의할 수 없다. 그러나 재즈의 전통적인 측면에서 볼 때 그 변화를 이야기 할 수 있는 리듬은 보편적인 재즈리듬이라 일컬어지는 스윙리듬(swing rhythm)이다. 이러한 스윙리듬은 현대의 폴리리듬을 이전보다 더 정교하게 연주하는 연주인들의 영향으로 말미암아 재즈의 역사 속에서 변화해 온 것과 다르게 좀 더 음표의 정의에 맞게 연주되는 경향이 생겼다. 이것은 어떤 면에서 전통적인 재즈리듬의 느낌, 혹은 개개인의 개성이 다소 사라지고 좀 더 기계화, 정형화되었다는 것을 의미한다.

• Proceeding of KASS Symposium
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• 2008.05a
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• pp.203-211
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• 2008

Bridges have various functions. There are not only a connection between 2 zones, but also a objee as a landmark. But movable bridges used in canal in order to pass ships. We can classify according to type of driving system, for example, swing, bascule, lift, arching, rotation, etc. I will suggest classification of various driving mechanism in the world.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.2
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• pp.3-7
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• 2008

A polishing machine adopting a new unique structural mechanism has been developed, named as a swing-arm type polishing machine. The mechanism is such that the tool path tracks on a spherical surface, of which the diameter is adjusted by setting up the machine mechanism properly. It has a strong benefit especially for polishing axis-symmetric concave mirror surfaces. The swing-arm type polishing machine with 5-axes has been designed in order to polish a concave mirror surface lip to diameter of 2 meters. The drawings are made using 3D CAD and strain-stress analysis has been done by finite element method. AC servo-motor has been used to move the swing arm and a operating software has been developed using a LapVIEW tool. Result of the test run was satisfactory which convinces the usefulness of the swing-arm type polishing machine.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.15 no.1
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• pp.50-58
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• 2003

An analytical study was carried out to investigate the performance of an oil pumping system of a variable speed compressor using a commercial CFD program. The simulations for the oil supplying system with the oil and air mixture were performed by varying compressor speed from 40 Hz to 90 Hz. Comparing the predicted with the measured data on the modified scroll compressor validated the simulation model. The predicted results were consistent with the test data with a maximum deviation of 12.8%. The oil flow rate significantly increased with a rise of compressor speed due to a higher oil flow rate from the swing pump and a greater centrifugal force on oil gallery.