• Title, Summary, Keyword: Group Technology

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Blazed $GxL^{TM}$ Device for Laser Dream Theater at the Aichi Expo 2005

  • Ito, Yasuyuki;Saruta, Kunihiko;Kasai, Hiroto;Nishida, Masato;Yamaguchi, Masanari;Yamashita, Keitaro;Taguchi, Ayumu;Oniki, Kazunao;Tamada, Hitoshi
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.556-559
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    • 2006
  • We successfully developed a high performance and highly reliable blazed GxL device with a high optical efficiency and a high contrast ratio. The device demonstrated superior resistance against a high power laser, which is suitable for a large-area laser projector. We operated the world's largest laser projection screen using this device at the 2005 World Exposition in Aichi, Japan, problem free.

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Novel PVA pixel design for mobile application with excellent off-axis image quality

  • Kim, Jae-Hyun;Kim, Gee-Bum;Choi, Ji-Youn;Jang, Yong-Kyu;Ahn, Seon-Hong;Kim, Kyeong-Hyeon;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.295-298
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    • 2008
  • We developed a novel PVA pixel design for mobile application with excellent off-axis image quality and optical performance by introducing Active Level Shift technology and optimizing pixel structure. Our new pixel design enables better off-axis image quality without sacrificing other optical properties compared with a conventional mPVA structure.

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Use of Mobile Devices in the Performance of Group Decision-Making under Contextual Pressure

  • Kwon, Oh-Byung;Kim, Tae-Kyung;Kim, Choong-Rhyun
    • Journal of Information Processing Systems
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    • v.3 no.2
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    • pp.64-72
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    • 2007
  • Mobile technology appears promising as a method to promote group performance in circumstances dependent on time, but not member proximity. However, the success of mobile technology in group decision-making situations has not yet been proven. This paper aims to see how mobile technology affects the performance of group decision-making tasks that should be resolved urgently and/or sources of idea are disconnected with on-line network. Laboratory experiment was used to investigate the effects of mobile factors on group decision-making. The results from the experiment supported the proposition that pressures of time and location play a significant role in the assessment of group decision performance measures. We found that the adoption of mobile technology to group decision-making procedures might be competitive when group decision-making tasks are urgent and sources of idea are disconnected with on-line network, even though mobile technology is not a panacea on which to depend when designing group decision-making.

Group Key Management based on (2, 2) Secret Sharing

  • Wuu, Lih-Chyau;Hung, Chi-Hsiang;Kuo, Wen-Chung
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.8 no.3
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    • pp.1144-1156
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    • 2014
  • In Internet, IP multicast has been used successfully to provide an efficient, best-effort delivery service for group communication applications. However, applications such as multiparty private conference, distribution of stock market information, pay per view and other subscriber services may require secure multicast to protect integrity and confidentiality of the group traffic, and validate message authenticity. Providing secure multicast for group communication is problematic without a robust group key management. In this paper, we propose a group key management scheme based on the secret sharing technology to require each member by itself to generate the group key when receiving a rekeying message multicast by the group key distributor. The proposed scheme enforces mutual authentication between a member and the group key distributor while executing the rekeying process, and provides forward secrecy and backward secrecy properties, and resists replay attack, impersonating attack, group key disclosing attack and malicious insider attack.

Blazed $GxL^{TM}$ Device for Laser Dream Theatre at the Aichi Expo 2005

  • Ito, Yasuyuki;Saruta, Kunihiko;Kasai, Hiroto;Nshida, Masato;Yamaguchi, Masanari;Yamashita, Keitaro;Taguchi, Ayumu;Oniki, Kazunao;Tamada, Hitoshi
    • 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.

Design of the Framework for Processing Large Sensor Data Stream (대용량 센서 데이터 스트림 처리를 위한 프레임워크 설계)

  • Choi Hyun-Hwa;Won Jong-Ho;Lee Hun-Soon;Chae Mi-Ok;Park Jae-Hong;Chung Warnill;Kim Byung-Seob;Lee Myung-Cheol;Lee Mi-Young
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.35-38
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    • 2004
  • 센서 데이터 스트림 처리 기술은 유비쿼터스 컴퓨팅의 핵심 기술로 그 중요성이 날로 증대되어, 현재 산업계는 물론 학계에서도 그 역량을 이에 집중하고 있다. 본 논문에서는, 센서 데이터 스트림에 대한 특징 및 이를 처리하기 위한 산업계와 학계의 동향을 알아본다. 그리고, 대용량 센서데이터 스트림을 처리하기 위해 요구되어지는 기능을 정리하고, 이를 기반으로 센서 데이터 스트림처리 시스템의 구조를 설계한다.

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Silicon Nitride Cantilever Arrays Integrated with Si Heater and Piezoelectric Sensors for SPM Data Storage Applications

  • Nam, Hyo-Jin;Jang, Seong-Soo;Kim, Young-Sik;Lee, Caroline-Sunyong;Jin, Won-Hyeog;Cho, Il-Joo;Bu, Jong-Uk
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.5 no.1
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    • pp.24-29
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    • 2005
  • Silicon nitride cantilevers integrated with silicon heaters and piezoelectric sensors were developed for the scanning probe microscope (SPM) based data storage application. These nitride cantilevers are expected to have better mechanical stability and uniformity of initial bending than the previously developed silicon cantilevers. Data bits of 40 nm in diameter were recorded on PMMA film and the sensitivity of the piezoelectric sensor was 0.615 fC/nm, meaning that indentations less than 20 nm in depth can be detected. For high speed operation, $128{\times}128$ cantilever array was developed.