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ATOMIC SCALE CRYSTAL GROWTH PROCESSES

  • Jackson, Kenneth A.;Beatty, Kirk M.
    • Proceedings of the Korea Association of Crystal Growth Conference
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    • 1999.06a
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    • pp.69-80
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    • 1999
  • Computer simulations have played a central role in the development of out understanding of the atomic scale processes involved in crystal growth. The assumptions underlying computer modeling will be discussed and out recent work on modeling of the kinetic formation of thermodynamically unstable phases in alloys or mixtures will be reviewed. Our Monte Carlo computer simulations have reproduced the experimental results on the rapid recrystallization of laser-melted doped silicon. An analytical model for this phenomenon has been developed, and its applicability to other materials will be discussed.

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Atomic scale crystal growth processes

  • Jackson, Kenneth A.;Beatty, Kirk M.
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.9 no.4
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    • pp.365-370
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    • 1999
  • Computer simulations have played a central role in the development of our understanding of the atomic scale processes involved in crystal growth. The assumptions underlying computer modeling will be discussed and our recent work on modeling of the kinetic formation of thermodynamically unstable phases in alloys or mixtures will be reviewed. Our Monte Carlo computer simulations have reproduced the experimental results on the rapid recrystallization of laser-melted doped silicon. An analytical model for this phenomenon has been developed, and its applicability to other materials will be discussed.

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A Conceptual Framework of the U.S. Suburbanization (미국 교외화에 대한 고찰과 개념적 분석틀)

  • ;Adrian X. Esparza
    • Proceedings of the KGS Conference
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    • 2004.05a
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    • pp.87-87
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    • 2004
  • 미국 교외화에 관한 전통적인 접근의 한 축인 natural evolution 이론에서는 교외화의 요인으로서 소득증가와 교외지역 단독주택(single-family detached housing)에 대한 수요 증가, 자동차의 대중화로 인한 주택수요자의 공간이동성 증가, 주택소유 장려와 고속도로 건설 등의 미국 연방정부의 각종 정책, 그리고 교외주택의 대량생산에 따른 주택소유 비용의 하락을 강조해왔다. (중략)

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CONFLICT RESOLUTION IN FUZZY ENVIRONMENT

  • Shen, Ling;Szidarovszky, Ferenc
    • Journal of applied mathematics & informatics
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    • v.5 no.1
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    • pp.51-64
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    • 1998
  • Conflict resolution methodology is discussed with fuzzified Pareto frontier. Four solution concepts namely the Nash solution the generalized nash solution the kalai-Smorodinsky concept and a solution method based on a special bargaining process are examined. The solutions are also fuzzy, the corresponding payoff values are fyzzy numbers the membership functions of which are determined. Three particular cases are considered in the paper. Linear quadratic, and general nonlinear pareto frontiers with known shape are examined.

Cationic Polymerization of Electron-Donor Monomers by 1,1,2,2-Tetracyanocyclopropylstyrene, A New Electron-Acceptor

  • Ju-Yeon Lee;Sung-Ok Cho;A. B. Padias;H. K. Hall, Jr.
    • Bulletin of the Korean Chemical Society
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    • v.12 no.3
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    • pp.271-273
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    • 1991
  • Poly (N-vinylcarbazole) was obtained spontaneously by 1,1,2,2-tetracyanocyclopropylstyrene(1) in polar solvents such as dichloromethane and acetonitrile at room temperature. The polymerization reactions were faster in more polar solvent and were not proceeded in less polar solvents such as chloroform and diethyl ether. The formation of poly (N-vinylcarbazole) was explained by bond-forming initiation theory, in which the initiating species are zwitterionic tetramethylene intermediates.

Mapping the Polarization of the Radio-Loud Lyman Alpha Nebula B3 J2330+3927

  • Yang, Yujin;You, Chang;Zabludoff, Ann;Smith, Paul;Jannuzi, Buell;Prescott, Moire
    • The Bulletin of The Korean Astronomical Society
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    • v.40 no.2
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    • pp.28.3-29
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    • 2015
  • $Ly{\alpha}$ nebulae, or "$Ly{\alpha}$ blobs", are extended (~100 kpc), bright (L[$Ly{\alpha}$] ~ 1044 erg/s) clouds of $Ly{\alpha}$-emitting gas. The origin of the $Ly{\alpha}$ emission remains unknown, but recent theoretical work suggests that measuring the polarization could discriminate among powering mechanisms. we will discuss current status of $Ly{\alpha}$ polarization observations at high-redshift and our on-going survey program. We will present the first narrow-band, imaging polarimetry of a $Ly{\alpha}$ blob, B3 J2330+3927 at z=3.09, with an embedded, radio-loud AGN (C. You et al. in prep.). The AGN lies near the blob's $Ly{\alpha}$ emission peak and its radio lobes align roughly with the blob's semi-major axis. With the SPOL polarimeter on the MMT telescope, we map the polarization in a grid of circular apertures of radius 0.6" (4.4 kpc), detecting a significant (>$2{\sigma}$) polarization fraction P% in 10 apertures and achieving strong upper-limits (as low as 2%) elsewhere. The degree of the polarization map increases from P% ~ 5% at ~5 kpc from the blob center to ~20% at the outer part (~30 kpc). The detections are distributed asymmetrically, roughly along the blob's major axis. The polarization angles (${\Theta}$) are mostly perpendicular to this axis. These results are consistent with the picture that $Ly{\alpha}$ photons produced at the AGN (or the host galaxy) are resonantly scattered away from the center. Higher polarization fraction on the radio jet suggests that the gas is more optically thin along the jet than the off-axis region.

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