• Title/Summary/Keyword: $L_{MAX}$

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Oxygen Partial Pressure Dependency of Al-donor Solubility in ZnO (ZnO내 Al-도우너의 용해도의 산소분압 의존성)

  • 김은동;김남균
    • Journal of the Korean Ceramic Society
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    • v.38 no.12
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    • pp.1093-1096
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    • 2001

  • The Solid solution of A $l_2$ $O_3$ into ZnO can be defined by the substitution reaction of Al$\^$3+/ ions into the Zn$\^$2+/ sites of ZnO crystal lattice, the tetrahedral interstices composed of four neighbor oxygen ions in the wurtzite structure. Since the reaction either creates new zinc vacancies or consumes the oxygen vacancies, it should be in equilibrium with ZnO nonstoichiometry and disorder reactions. The relationships make oxygen partial pressure P$\sub$o2/ control the concentrations of the vacancies and consequently limit the Al solubility in ZnO, [Al$\sub$zn/]$\sub$max/. This paper firstly reports with a refined model for defect quilibria in ZnO that the solubility decrease with the increase of P$\sub$o2/, [Al$\sub$zn/]$\sub$max/ P$\sub$o2/$\^$-1/4/.

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Compact Triple-Band Monopole Antenna for WLAN/WiMAX-Band USB Dongle Applications

  • Shi, Ya Wei;Xiong, Ling;Chen, Meng Gang
    • ETRI Journal
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    • v.37 no.1
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    • pp.21-25
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    • 2015

  • A miniaturized triple-band antenna suitable for wireless USB dongle applications is proposed and investigated in this paper. The presented antenna, simply consisting of a circular-arc-shaped stub, an L-shaped stub, a microstrip feed line, and a rectangular ground plane has a compact size of $16mm{\times}38.5mm$ and is capable of generating three separate resonant modes with very good impedance matching. The measurement results show that the antenna has several impedance bandwidths for S11 ${\leq}$ -10 dB of 260 MHz (2.24 GHz to 2.5 GHz), 320 MHz (3.4 GHz to 3.72 GHz), and 990 MHz (5.1 GHz to 6.09 GHz), which can be applied to both 2.4/5.2/5.8 GHz WLAN bands and 3.5/5.5 GHz WiMAX bands. Moreover, nearly-omni-directional radiation patterns and stable gain across the operating bands can be obtained.

  • https://doi.org/10.4218/etrij.15.0114.0676 인용 PDF KSCI KPUBS

Isolation and Culture of Protoplasts from Hypocotyl-derived Callus of Soybean (Glycine max) (대두 (Glycine max) 부배유 유래 칼루스의 원형질체 분리 및 배양)

  • 이광웅
    • Journal of Plant Biology
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    • v.28 no.3
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    • pp.233-241
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    • 1985

  • The isolation and culture of protoplasts from hypocotyl-derived calluses of Glycine max (L.) Merr. cv. Jangyeop were obtained by digestion for 6 hrs in an enzyme solution containing 3.5% cellulase, 1.5% macerozyme, 10% sorbitol and 0.1% CaCl2.2H2O at pH 5.8. Newly formed cell wall of protoplasts cultured in MS agar medium containing 10 $\mu$M $\alpha$-naphthaleneacetic acid (NAA) and 32 $\mu$M N6-benzylaminopurine (BAP) could be observed after 24 hrs culture. The first cell division of the protoplasts was observed after 3 days of culture; cell clusters after 2 weeks of culture. When transferred to solid media, the protoplasts formed cell clusters gave rise to proliferating calluses.

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Derivation of the Expected Busy Period U sing its Pseudo Probability Density Function for a Controllable M/G/l Queueing Model Operating Under the Max (N, T, D) Policy (가상확률밀도함수를 사용하여 Max(N, T, D) 운5방침이 적용되는 조정가능한 M/G/1 대기모형의 busy period의 기대값 유도)

  • Rhee, Hahn-Kyou;Oh, Hyun-Seung
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.31 no.4
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    • pp.86-92
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    • 2008

  • The expected busy period for the controllable M/G/1 queueing model operating under the triadic Max (N, T, D) policy is derived by using a new concept so called "the pseudo probability density function." In order to justify the proposed approaches for the triadic policy, well-known expected busy periods for the dyadic policies are recovered from the obtained result as special cases.

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