• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2505-2507
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• 2001

The RF signal is distorted since the cross-talk noise from adjacent tracks and ISI(Inter Symbol Interference) is also incresed as recording density is increased. These cross-talk noise and ISI are main reason of reading error for the embossed pits on the disc. In this study we suggest a new coding method, spaced modulation technique and a detection technique for the spaced modulation. We report the result shows detection performance is improved when we use the suggested spaced modulation code and the detection technique instead of conventional modulation code.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.115.1-115.1
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• 2007

• Proceedings of the Materials Research Society of Korea Conference
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• 1994.11a
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• pp.172-172
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• 1994

• Proceedings of the Korea Society of Design Studies Conference
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• 2002.11b
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• pp.136-137
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• 2002

• Proceedings of the Korean Magnestics Society Conference
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• 1991.11a
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• pp.102-103
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• 1991

• Proceedings of the Korean Magnestics Society Conference
• /
• 1999.10a
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• pp.18-19
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• 1999

• Proceedings of the Korean Magnestics Society Conference
• /
• 2008.12a
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• pp.134.1-134.1
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• 2008

• Proceedings of the Korean Magnestics Society Conference
• /
• 2007.05a
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• pp.33.2-33.2
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• 2007

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.589-595
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• 2001

The present study conducted heat transfer analysis in multi-layer of CD-R. It is necessary to analyze heat transfer during the recording process to find optimum power and write strategy in CD-R. This study investigated effects of several parameters such as recording speed, laser power, layer thickness and thermal property. The calculated results presented temperature distribution in the multi-layer and detailed information of recording characteristics. Optimum laser power was estimated, comparing an optimum mark length with the calculated mark lengths. The results showed that the optimum laser power was influenced significantly by the layer thickness and the thermal properties of the dye.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.1621-1626
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• 2003

This study deals with the heat transfer analysis on phase change optical disc with land/groove recording by means of numerical method. Finite difference time domain(FDTD) method was used to obtain the amount of absorption of light propagating inside disc and finite difference element(FEM) method was used to calculate the temperature distribution. The calculated results present the detailed information of recording characteristics on the phase change optical disc. The temperature profiles are quite different between the land track and the groove track. The recorded mark shape on land track is smaller and more elliptic than that on groove track. It is shown that the thermal problem to the neighboring track takes place due to secondary peaks. It is found that the different write strategy should be applied to land and groove recording, respectively.