• Journal of the Korean Society for Precision Engineering
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• v.31 no.4
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• pp.335-342
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• 2014

This paper describes the forming conditions of smart-phone curved glass using the glass molding system with force applying system. The force applying system is composed of a body, a motor and gear, a rectilinear movement structure, a force sensor, a LVDT sensor (Linear Variable Differential Transformer), a up and down moving block, and so on. The glass molding system for characteristic test to find the forming conditions consists of the force applying system and a chamber, a metallic mold, a upper heater, a lower heater and so on. The characteristic test for forming conditions of smart-phone curved glass was carried out at forming temperature $620^{\circ}C$ and $650^{\circ}C$ using the glass molding system. As a result of the characteristic test, the forming conditions of curved glass could be found, and it is thought that the conditions can be used to apply to the system for producing in large quantities.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.1
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• pp.40-45
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• 2004

This paper presents the parallel distributed control scheme for shaping of the bent glass. The designed system consists of a PC, a main controller and 11 servo-controllers, the precision motion controllers. Each elements are connected by using RS-232C and 8-bit data bus. In order to guarantee the stability and the control performance, we use a precision PID motion controller and a H-bridge on the servo-drivers. PC calculates position values of 11 DC motors by using the pre-determined curvature value and offers the user interface environment operator. The main controller provides the control instructions and parameter values to 11 servo-controllers by chip enable signal, simultaneously. Using the received commands and parameter values, the servo-controllers control the positions of the DC motors based on PID control scheme.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.126-127
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• 2003

1차원의 레이저빔을 공간내의 전방향으로 퍼트리는 새로운 광학기기인 중공형 원통 프리즘에 대해 보고하고자 한다. 중공형 원통 프리즘은 아래의 그림 1과 같이 속이 빈 유리튜브의 구조를 가진다. 레이저광이 유리관의 표면에 입사되면 반사 및 굴절의 현상이 나타난다. 일반적으로 유리는 굴절률이 공기보다 높아 내부반사가 여러 번 일어나므로 유리관 표면에 입사된 레이저빔은 유리관의 곡면을 따라 진행하면서 반사 또는 굴절의 과정을 반복적으로 거치게 된다. (중략)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1027-1028
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• 2013

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06c
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• pp.427-430
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• 1998

본 논문은 고속철도 역사의 통과구간 설계에 있어서 소음방지에 효과적인 설계안을 검토하기 위하여 7가지의 다양한 대안의 모델을 시뮬레이션하여 그 결과를 비교 분석하였다. 고속열차의 최대 운영속도 300 km/h 기준시 승강장의 허용소음도는 약 91 dB(A) 일 때 이를 만족하는 설계안은 통과구간의 양쪽에 설치하는 방음벽으로는 부족하며 통과구간을 곡면유리로 폐쇄한 터널식의 설계가 허용소음도를 만족하는 것으로 나타났다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.161-164
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• 2003

This research presents the parallel control scheme of PID servo-driver for shaping of the curved glass. The designed system consists of a PC, main controller and 11 servo-drivers. Each elements are connected by using RS-232C and 8-bit bus communication. In order to guarantee the stability and the control performance, we use the LM629, a precision PID motion controller, and LMD18200, a H-bridge on the servo-drivers. PC calculates position values of 11 DC motors by using the pre-determined curvature value and offers the user interface environment operator.

• 한국태양에너지학회:학술대회논문집
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• 2012.03a
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• pp.543-548
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• 2012

The use of glass applied to curved surface as a building material has increased in recent years. However, the curved glass is difficult to guarantee the quality in process of making it into double glazing, So it is vulnerable to thermal breakage. In this paper, when the glass broken during experiments, surface temperature difference on curved double glazing was compared to that of heat strengthened glass and flat glass. As a result, flat single glass was broken at temperature difference of 100~140 degrees but curved double glazing was broken at that of 40~60 degrees. Therefore, curved double glazing is more vulnerable than flat double glazing to thermal breakage, so it should be considered when applied to building facade.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.47-48
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• 2013

• Computational Structural Engineering
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• v.25 no.2
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• pp.57-61
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• 2012

• Journal of Institute of Control, Robotics and Systems
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• v.20 no.5
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• pp.570-577
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• 2014

This paper describes the design of a force applying system for a smart phone curved glass molding system and its characteristic test. The force applying system is composed of a motor and gear, a rectilinear movement structure, a force sensor, an LVDT (Linear Variable Differential Transformer) sensor, an up and down moving block, and so on. The system precisely controls the applying force and time to the plane glass because the glass can be easily destroyed under applied force, and can be bent imperfectly. As a result of the characteristic test, the curved glass can be manufactured using this system, and the holding time under 0N force, the applying force to the plane glass, the time for applying from 0N to maximum force, and the holding time under maximum force at the manufacture feasible temperature $620^{\circ}C$ were found.