• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2496-2498
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• 2001

광 디스크 channel상에서 RSPC의 error correction capability를 확률적인 계산 방법으로 계산하는 데는 많은 어려움이 있다. 그 이유는 바로 광 디스크 channel이 burst error channel이기 때문인데, 이 burst error를 어떻게 다루는 가에 따라 그 error correction capability는 사뭇 달라진다. 이 논문에서는 Sony의 dust error distribution[1] 아래에서 4-state Morkov Chain[2]로 modeling하고 그 결과를 가지고 burst error를 channel의 특성과 ECC format의 특성에 맞게 제어할 수 있는 확률적인 계산방법을 소개하고 그것을 simulation하고자 한다.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.7
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• pp.52-60
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• 1998

In optical disc system, 4-wire actuator has undesired tilt which degenerates the performance of RF signal. This tilt occurs from moment around the axis parallel to the tangential direction of the disk. The main reason of the moment is the coupling effect between focus driving system and tracking driving system. This paper constructed tilt mechanism and analyzed tilt quantity due to the moment based on structural analysis and magnetic field analysis. And the experiment about tilt was executed. The results were compared and discussed about the difference. Then, the design method for reducing tilt angle was suggested.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.5
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• pp.122-130
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• 2004

In a high-speed and wide operating field optical disk drive, the vibration problem is one of the most important factors to be considered for reliable performance. And a disk misaligned with axis of rotation is a major source of vibration in optical disk drive. Furthermore, this vibration disturbance of the disk spindle system causes failure in the reading and writing process. So to solve this vibration problem, the vibration absorber using rubber mount has been introduced in recent years. In this paper, we have analyzed the simple optical disk drive model with dynamic vibration absorber through dynamic analysis of 12-dof by Recurdyn program and obtained optimal mass and frequency ratios of dynamic vibration absorber of dynamic vibration absorber and the optimal frequency ratio.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.961-966
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• 2001

The schematic design process is formulated to develop the vibroisolating rubber mount in optical disc drives. The dynamic model of vibration isolation system is established by using a rigid body with 6 degree of freedom and linear springs with damping property. Considering the practical vibration condition of DVDP(Digital Versatile Disk Player), the required properties of vibroisolating rubber mounts are investigated. Also finite element model of a vibroisolating rubber mount is used to obtain shape design concept and identify the characteristics of a rubber mount which satisfies the required properties from previous design stage. Finally the evaluation method of dynamic properties of vibroisolating rubber mounts is established by utilizing modal test method. Based on the developed process, vibroisolating rubber mounts with a good performance have been developed.

• Journal of KSNVE
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• v.9 no.2
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• pp.355-362
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• 1999

Vibration reduction of an optical disk drive is achieved by an automatic ball balancer and dynamic behaviors of the drive are studied by theoretical approaches. Using Lagrange's equation, we derive nonlinear equations of motion for a non-autonomous system with respect to the rectangular coordinate. To investigate the dynamic stability of the system in the neighborhood of equilibrium positions, the Floquet theory is applied to the perturbed equations. On the other hand, time responses are computed by an explicit time integration method. We also investigate the effects of mass center and the position of the ABB on the dynamic behaviors of the system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.231-231
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• 2005

• Proceedings of the IEEK Conference
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• 2003.11a
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• pp.465-468
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• 2003

본 논문에서는 광 저장장치의 기록밀도가 증가할 경우 발생하는 여러 가지 문제점들에 대응하는 PRML 시스템 구현 방법을 제안하고 기존의 시스템의 성능과 제안된 시스템의 성능을 비교한다. 기존의 채널 적응기법 및 비터비 복호화기에 대비해 보다 종은 성능을 가지는 구조의 비선형 등화방식과 비터비 예상 레벨 적응 알고리즘을 이용한 새로운 구조를 제안하고, 23Gbyte 저장용량을 가지는 Blu-ray 디스크에 28GB의 데이터를 기록하여 기록 기록밀도가 증가한 실제 디스크에 대한 실험 결과에 대하여 논한다.

• Computational Structural Engineering
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• v.2 no.4
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• pp.23-26
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• 1989

대부분의 도면은 종이나 천 또는 마일라(Mylar, 주:강화 폴리에스테르 필름, 세피아 라고도 부름) 등에 저장하거나, 현대에 와서는 디지탈 방식으로 컴퓨터에 저장한다. 그러나 최근에 와서는 광학적으로 저장하는 제3의 방법이 등장하였다. 도면과 지도를 콤팩트디스크에 광학적으로 보관하면 종이나 천 등에 보관할 때보다 더 오래 보존되고 더 쉽게 관리할 수 있을 뿐만 아니라, 전 시스템을 전산화 시킨 도면관리방식에 비해 훨씬 낮은 비용으로 저장과 관리가 가능해진다.

• The Science & Technology
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• v.17 no.11 s.186
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• pp.41-43
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• 1984

네트워크 아키텍춰 (Network Architecture) / 텔레텍스(Teletex) / 문자다중방송 (Teletext system) / 광디스크메모리 (Optical Disk Memory)

• 한국전자현미경학회:학술대회논문집
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• 1995.12a
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• pp.13-14
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• 1995