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Browsing by Issue Date, starting with "2008-05-09"

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    Electrophosphorescent polyfluorenes containing osmium complexes in the conjugated backbone
    (2008-05-09)
    Chien, Chen-Han
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    Liao, Song-Fu
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    Wu, Chen-Hao
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    Shu, Ching-Fong
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    Chang, Sheng-Yuan
    Electrophosphorescent copolymers have been synthesized by covalent bonding of a red-emitting osmium complex Os(bpftz), which contains two 3-trifluoromethyl-5-(4-tert-butyl-2-pyridyl)triazolate (bpftz) cyclometalated ligands, into the backbone of a bipolar polyfluorene (PF) copolymer. Employing these copolymers, a highly efficient red polymer light-emitting diode has been realised that has an external quantum efficiency of 18.0%, a maximum brightness of 38000 cd m(-2), and an emission centered at 618 nm. In addition, after incorporating appropriate amounts of green-emitting benzothiadiazole (BT) and the aforementioned Os(bpftz) into the bipolar PF, an efficient white-light electroluminescent polymer is obtained that displays simultaneous blue, green, and red emissions.
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    Jug measuring: Algorithms and complexity
    (2008-05-10)
    Shieh, Min-Zheng
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    Tsai, Shi-Chun
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    資訊工程學系
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    Department of Computer Science
    We study the hardness of the optimal jug measuring problem. By proving tight lower and upper bounds on the minimum number of measuring steps required, we reduce an inapproximable NP-hard problem (i.e., the shortest GCD multiplier problem [G. Havas, J.-P. Seifert, The Complexity of the Extended GCD Problem, in: LNCS, vol. 1672, Springer, 1999]) to it. It follows that the optimal jug measuring problem is NP-hard and so is the problem of approximating the minimum number of measuring steps within a constant factor. Along the way, we give a polynomial-time approximation algorithm with an exponential error based on the well-known LLL basis reduction algorithm. (C) 2008 Elsevier B.V. All rights reserved.
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    《女舍》現代人荒謬的秘密心事
    (2008-05-11)
    林暐家
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    Department of Communication and Technology
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    傳播與科技學系
    123
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    「九降風」─青春的真情記錄
    (2008-05-11)
    吳念慈
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    Department of Communication and Technology
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    傳播與科技學系
    「九降風」影評。
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    提防帳號盜用 線上遊戲玩家須謹慎
    (2008-05-11)
    郭品君
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    Department of Communication and Technology
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    傳播與科技學系
    網路遊戲盜帳號
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    找回失去的童年「兒童樂園」
    (2008-05-11)
    姜建亨
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    Department of Communication and Technology
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    傳播與科技學系
    長大後就不曾再進去兒童樂園， 雖然已經不是兒童了，但是回憶似乎一幅幅還勾勒在回憶中。
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    企業社會責任 華碩率先執行
    (2008-05-11)
    楊宇軒
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    Department of Communication and Technology
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    傳播與科技學系
    企業社會責任
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    「Time freeze」 青少年街頭創意活動
    (2008-05-11)
    陳貞儒
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    Department of Communication and Technology
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    傳播與科技學系
    時間凍結
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    日本樂天進攻 價格仍是重點
    (2008-05-11)
    陳惠玟
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    Department of Communication and Technology
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    傳播與科技學系
    日本樂天網路購物平台
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    好「萌」興起　你認識多少
    (2008-05-11)
    鍾瑄
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    Department of Communication and Technology
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    傳播與科技學系
    萌文化
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    跨性別者的美麗與哀愁
    (2008-05-11)
    賴奕如
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    Department of Communication and Technology
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    傳播與科技學系
    跨性別者的美麗與哀愁
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    舞次方新作「女舍」 爆笑呈現女生宿舍的生活
    (2008-05-11)
    薛怡凡
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    Department of Communication and Technology
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    傳播與科技學系
    「女舍」舞蹈以具現代感且詼諧幽默的手法，充分呈現現實女生宿舍生活的縮影，帶給觀眾新鮮且驚奇的感官享受。
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    裝錯軀殼的靈魂－跨性別
    (2008-05-11)
    姚翔
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    Department of Communication and Technology
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    傳播與科技學系
    跨性別國內現況
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    腳踝運動傷害防治
    (2008-05-11)
    汪承漢
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    Department of Communication and Technology
    ;
    傳播與科技學系
    運動傷害預防flash
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    總編輯的話
    (2008-05-11)
    鄭瑋津
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    Department of Communication and Technology
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    傳播與科技學系
    總編輯的話
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    《刺殺據點》 案發現場直擊
    (2008-05-11)
    陳濡群
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    Department of Communication and Technology
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    傳播與科技學系
    刺殺據點
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    反其道而行 傳科畢展在新竹
    (2008-05-11)
    沈昭邦
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    Department of Communication and Technology
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    傳播與科技學系
    傳科系選擇在校內辦畢展，究竟會有多少人來看呢？
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    紅嘴麵包
    (2008-05-12)
    管管
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    Anisotropy of light extraction from GaN two-dimensional photonic crystals
    (2008-05-12)
    Lai, Chun-Feng
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    Chi, Jim-Yong
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    Kuo, Hao-Chung
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    Chao, Chia-Hsin
    ;
    Hsueh, Han-Tsung
    Angular distribution of light diffracted out of the plane of two-dimensional photonic crystals ( PhC) has been studied in the azimuthal direction with a specially designed waveguide structure. The optical images of the light extraction patterns from the guided photoluminescence light are obtained with laser excitation in the center of the annual structure made on GaN multilayer. For increasing lattice constant, symmetric patterns with varying number of petals according to the symmetry of the PhC are observed. The appearance and disappearance of the petals can be explained using the Ewald construction in the reciprocal space. The dependence of light extraction on the lattice constant and orientation, and incident angle are investigated. (C) 2008 Optical Society of America.
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    High quantum efficiency dots-in-a-well quantum dot infrared photodetectors with AlGaAs confinement enhancing layer
    (2008-05-12)
    Ling, H. S.
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    Wang, S. Y.
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    Lee, C. P.
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    Lo, M. C.
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    電子工程學系及電子研究所
    We demonstrate the high quantum efficiency InAs/In(0.15)Ga(0.85)As dots-in-a-well (DWELL) quantum dot infrared photodetectors (QDIPs). A thin Al(0.3)Ga(0.7)As layer was inserted on top of the InAs quantum dots (QDs) to enhance the confinement of QD states in the DWELL structure. The better confinement of the electronic states increases the oscillation strength of the infrared absorption. The higher excited state energy also improves the escape probability of the photoelectrons. Compared with the conventional DWELL QDIPs, the quantum efficiency increases more than 20 times and the detectivity is about an order of magnitude higher at 77 K. (c) 2008 American Institute of Physics.