• Title/Summary/Keyword: dvd

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DVD 기술

  • 송태선;김진용
    • Optical Science and Technology
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    • v.1 no.2
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    • pp.32-42
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    • 1997

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Synoptic Meteorological Classification and Analysis of Precipitation Characteristics in Gimhae Region Using 2DVD and Parsivel (2DVD와 Parsivel 이용한 김해지역 강수사례일의 종관기상학적 분류 및 강수 특성 분석)

  • Cheon, Eun-Ji;Park, Jong-Kil;Jung, Woo-Sik
    • Journal of Environmental Science International
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    • v.26 no.3
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    • pp.289-302
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    • 2017

  • During the research period, error analysis of the amount of daily precipitation was performed with data obtained from 2DVD, Parsivel, and AWS, and from the results, 79 days were selected as research days. According to the results of a synoptic meteorological analysis, these days were classified into 'LP type, CF type, HE type, and TY type'. The dates showing the maximum daily precipitation amount and precipitation intensity were 'HE type and CF type', which were found to be attributed to atmospheric instability causing strong ascending flow, and leading to strong precipitation events. Of the 79 days, most days were found to be of the LP type. On July 27, 2011 the daily precipitation amount in the Korean Peninsula reached over 80 mm (HE type). The leading edge of the Northern Pacific high pressure was located over the Korean Peninsula with unstable atmospheric conditions and inflow of air with high temperature and high humidity caused ascending flow, 120 mm/h with an average precipitation intensity of over 9.57 mm/h. Considering these characteristics, precipitation in these sample dates could be classified into the convective rain type. The results of a precipitation scale distribution analysis showed that most precipitation were between 0.4-5.0 mm, and 'Rain' size precipitation was observed in most areas. On July 9, 2011, the daily precipitation amount was recorded to be over 80 mm (CF type) at the rainy season front (Jangma front) spreading across the middle Korean Peninsular. Inflow of air with high temperature and high humidity created unstable atmospheric conditions under which strong ascending air currents formed and led to convective rain type precipitation.

  • https://doi.org/10.5322/JESI.2017.26.3.289 인용 PDF

VLSI Design of Reed-Solomon Decoder over GF($2^8$) with Extreme Use of Resource Sharing (하드웨어 공유 극대화에 의한 GF($2^8$) Reed-Solomon Decoder의 VLSI설계)

  • 이주태;이승우;조중휘
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.36C no.3
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    • pp.8-16
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    • 1999

  • This paper describes a VLSI design of Reed-Solomon(RS) decoder using the modified Euclid algorithm, with the main theme focused on the $\textit{GF}(2^8)$. To get area-efficient design, a number of new architectures have been devised with maximal register and Euclidean ALU unit sharing. One ALU is shared to replace 18 ALUs which computes an error locator polynomial and an error evaluation polynomial. Also, 18 registers are shared to replace 24 registers which stores coefficients of those polynomials. The validity and efficiency of the proposed architecture have been verified by simulation and by FLEX$^TM$ FPGA implementation in hardware description language VHDL. The proposed Reed-Solomon decoder, which has the capability of decoding RS(208,192,17) and RS(182,172,11) for Digital Versatile Disc(DVD), has been designed by using O.6$\mu\textrm{m}$ CMOS TLM Compass$^TM$ technology library, which contains totally 17k gates with a core area of 2.299$\times$2.284 (5.25$\textrm{mm}^2$). The chip can run at 20MHz while the DVD requirement is 3.74MHz.

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