• Journal of Information Display
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• v.8 no.2
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• pp.10-14
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• 2007

A blazed $GxL^{TM}$ device is described as having high optical efficiency (> 70% for RGB lasers), and high contrast ratio (> 10,000:1), and that is highly reliable when used in a large-area laser projection system. It has a robust design and precise stress control technology to maintain a uniform shape (bow and tilt) of more than 6,000 ribbons, a $0.25-{\mu}m$ CMOS compatible fabrication processing and planarization techniques to reduce fluctuation of the ribbons, and a reliable Al-Cu reflective film that provided protection against a high-power laser. No degradation in characteristics of the GxL device is observed after operating a 5,000- lumen projector for 2,000 hours and conducting 2,000 temperature cycling tests at $-20^{\circ}C$ and $+80^{\circ}C$. At the 2005 World Exposition in Aichi, Japan the world's largest laser projection screen with a size of 2005 inches (10 m ${\times}$ 50 m) and 6 million pixels (1,080 ${\times}$ 5,760) was demonstrated.

• The Bulletin of The Korean Astronomical Society
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• v.25 no.1
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• pp.38-38
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• 2000

• The Bulletin of The Korean Astronomical Society
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• v.25 no.1
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• pp.37-37
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• 2000

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2005.09a
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• pp.145-156
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• 2005

• Polymer Science and Technology
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• v.24 no.1
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• pp.30-37
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• 2013

• Bulletin of the Korean Chemical Society
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• v.33 no.6
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• pp.2059-2062
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• 2012

• Polymer Science and Technology
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• v.23 no.5
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• pp.513-524
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• 2012

• Proceedings of the Korean Nuclear Society Conference
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• 1999.05a
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• pp.317-317
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• 1999

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.42-42
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• 2000

No Abstract, See Full Text

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.2
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• pp.935-949
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• 2016

In this paper, we present a novel authenticated group key distribution scheme for large and dynamic multicast groups without employing traditional symmetric and asymmetric cryptographic operations. The security of our scheme is mainly based on the basic theories for solving linear equations. In our scheme, a large group is divided into many subgroups, where each subgroup is managed by a subgroup key manager (SGKM) and a group key generation center (GKGC) further manages all SGKMs. The group key is generated by the GKGC and then propagated to all group members through the SGKMs, such that only authorized group members can recover the group key but unauthorized users cannot. In addition, all authorized group members can verify the authenticity of group keys by a public one-way function. The analysis results show that our scheme is secure and efficient, and especially it is very appropriate for secure multicast communications in large and dynamic client-server networks.