• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.47-52
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• 2002

현재 많은 산업에서 원료의 단가는 상승하나 재생이 가능한 제품을 효율적으로 사용하기 위한 일환으로써 기존의 설비보다 2배의 생산량을 가질 수 있는 장치를 개발하여 생산량을 극대화 할 필요성이 있다. 본 연구는 벌크 상태의 원료를 이송장치에 의해 디스크에 투입되어 고속으로 회전하는 원판에서 양면의 마찰과 융착으로 인한 순간 냉각으로 비중을 변화시켜 원료를 재생하는 장치이다. 이에 따른 스케일 업에 대한 각종 문제점을 해결하여 양품의 품질을 생산하는 방법을 제시하고 효과적인 시스템을 구축 하고자 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.399-400
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• 2014

최근에 디스플레이 산업이 변화하고 우리나라 기업들이 세계시장을 주도해나가고 있는 실정이다. 특히 FPD 기술에 있어서 화면의 크기가 급속하게 대형화함에 따라 품질향상과 생산성 향상을 위해서 생상환경과 설비의 자동화가 매우 중요한 이슈가 되고 있다. 본 논문에서는 FPD 제조 공정 중 화학 증착 및 메탈 주입 공정 중 원판 GLASS의 이송 및 고정에 있어 항시 사용하는 GLASS CARRIER의 검사에 있어서 자동으로 검사할 수 있는 시스템을 제안한다.

• The Magazine of the IEIE
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• v.21 no.8
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• pp.39-47
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• 1994

전자제품의 소형화와 반도체 및 관련 Packaging 기술의 발달로 인해 PCB는 회로의 세선화 및 Via Hole의 소형화, 다양화 그리고 두께의 박판화의 추세로 사양이 변하고 있다. 이를 달성하기 위해 PCB 제조 Process에 변화가 있으며 또한 새로운 형태의 PCB 제조방법이 모색되고 있다. 원판에서도 박판화의 대응으로 내연성이 강조되고 있으며 고주파용으로는 저유전율, 특수 동박이 요구되고 있다. 신 PCB 제조공정 및 공법으로는 특수 Via Hole 사용, ?, ED, Direct Plate가 있다. 또한 PCB는 Packaging 기술의 하나로 이해되며 강조되고 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1315-1316
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• 2011

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.438-442
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• 1996

A model testing method to monitor modal characteristics of a rotating disk, such as the mode and its motion relative to the disk, is presented in this paper. It is shown through measurements that this method can be applied to monitor the vibration characteristics of a rotating disk under operating conditions.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.911-914
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• 2005

The vibrational characteristics of the piezoelectric disc for a torsional vibration transducer is theoretically studied in this paper. The characteristic equation of the piezoelectric annular disc has been derived from Newton's End law and Gibb's free energy equations. With an anisotropic material property of the disc, the characteristic equation has yielded resonance frequencies. Numerically-calculated results were compared with the values obtained by finite element analysis and experiments

• Journal of the Korean Society of Visualization
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• v.22 no.1
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• pp.28-33
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• 2024

We visualized the rupturing of liquid films flowing over a disk rotating with large angular velocity. A setup of high speed imaging for liquid flows on dark and reflective surfaces are suggested. From the result, rivulet structures are revealed to be strongly governed by three-dimensional surface structures developed in the film flow. Additionally, unique flow structures including the rivulet sliding and internal meandering are investigated. Generation mechanism of such structures are discussed in terms of the dynamic contact angle theory.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.04a
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• pp.263-270
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• 1996

Noise control of a plate structure with multiple disk shaped piezoelectric actuators is studied. The plate is excited by an acoustic pressure field produced by a noise source located below the plate. Finite element modeling is used for the plate structure that supports a combination of three dimensional solid, flat shell and transition elements. The objective function, in the optimization procedure, is to minimize the sound energy radiated onto a hemispherical surface of given radius and the design parameters are the locations and sizes of the piezoelectric actuators as well as the amplitudes of the voltages applied to them. Automatic mesh generation is addressed as part of the modeling procedure. Numerical results for both resonance and off resonance frequencies show remarkable noise reduction and the optimal locations of the actuators are found to be close to the edges of the plate structure. The optimized result is robust such that when the acoustic pressure pattern is changed, reduction of radiated sound is still maintained. The robustness of an optimally designed structure is also tested by changing the frequency of the noise source using only the actuator voltages as design parameters.

• Resources Recycling
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• v.7 no.1
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• pp.27-33
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• 1998

A study on thc recovcry oi nickel from waste pickling solutions removed li-ee nil~ica cid and hydmflnoric acid is carried out with pulsed column extractor for thc industrial application. The ~esults show that thc Iron and chromium arc efteclively elunmatcd from the waste solution by precipitalion as the form of hydraxidc with thc adjustment of pH with CaCO;, whlle the nickel is not prcc~pitatcd. Thc cxlraction eficicncy ol nickel with column cxtraclor generally improves 8s the pulse velosity (product of amplmde and frequency) incrcascs, optimum pcrfarmancc typically occuring slightly below an amplihldefrecluency product which results in flooding the column because of excessive emulsiIicalian And the nickel loaded in the organic is erfeclively conce~~trtratebdy ZM H2S0,, ~ I It he stlipping stage. The solubility of NiSO, in the H,SO, solution dccreaaes w~th thc higher H,SO, concentralion and appears to be 55 grL in the 2M HSO* solulian.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.10 no.1
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• pp.173-184
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• 1990

This study is an experimental research on the treatment of phenolic wastes by Rotating Biological Contactors(RBC). The objective of this study is to determine the optimum range of influent phenol concentration and organic loading rate. Organic removal rates were analyzed with increasing organic loading and influent phenol concentration, together with the observation of microorganism. Biomass, SCOD, and phenol concentration were measured under the steady state after a step change of influent phenol concentration. As the result, at the phenol concentration less then 98.8 mg/L there were no evidence of substrate inhibition. As the results, organic removal rates in each stage at various organic loading, were decreased with increasing phenol concentration. First order kinetic was observed on the removal of SCOD for which phenol concentration is within the range of substrate inhibition. And also, microorganisms were changed with influent phenol concentration. Namely, at low influent phenol concentration, thin biofilm with filamentous growth was produced. To the contrary, thick biofilm with nonfilamentous growth was produced at high influent phenol concentration.