Browsing by Issue Date, starting with "2010-02-15"

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A structure-preserving doubling algorithm for quadratic eigenvalue problems arising from time-delay systems
(2010-02-15)
Li, Tie-Xiang
;
Chu, Eric King-wah
;
Lin, Wen-Wei
;
應用數學系
;
Department of Applied Mathematics
We propose a structure-preserving doubling algorithm for a quadratic eigenvalue problem arising from the stability analysis of time-delay systems. We are particularly interested in the eigenvalues oil the unit circle, which are difficult to estimate. The convergence and backward error of the algorithm are analyzed and three numerical examples are presented. Our experience shows that Our algorithm is efficient in comparison to the few existing approaches for small to medium size problems. (C) 2009 Elsevier B.V. All rights reserved.
Canine CD8 T cells showing NK cytotoxic activity express mRNAs for NK cell-associated surface molecules
(2010-02-15)
Lin, Yi-Chun
;
Huang, Yi-Chun
;
Wang, Yu-Shan
;
Juang, Rong-Huay
;
Liao, Kuang-Wen
Natural killer (NK) cells have been considered to be a group of lymphocytes lacking clonally distributed receptors for antigens typical of T cells and B cells. in some mammalian species, including humans, a subpopulation of CD8(+) peripheral blood lymphocytes (PBLs) exhibits NK activity. This NK subpopulation has not been well characterized in mammals and its characterization is particularly poor in the dog. In this study, we demonstrated that a subset of canine CD8(+) cells derived from PBLs and lymphokine (IL-2)-activated killers (LAKs) of PBLs that was CD3(+), CD4(-), CD21(-), CD5(lo), alpha/beta TCR(+), and gamma/delta TCR(-) contained substantially higher levels of mRNAs for NK cell-related receptors (NKp30, NKp44, NKG2D, 2B4, and CD16 for PBL, and NKG2D and CD56 for LAK) than the corresponding CD8(-) cells. This subset of CD8(+) lymphocytes derived from LAKs also displayed significantly higher NK cytotoxic activity than the corresponding CD8(+) cells. In contrast, CD8(+) cells derived from nonstimulated PBLs showed very low levels of NK cytotoxic activity. Our results indicate that, in IL-2-stimulated PBLs, canine CD8(+) cells are an important subset associated with NK cytotoxic activity. (C) 2009 Elsevier B.V. All rights reserved.
Efficiency Improvement of GaN-Based Light-Emitting Diode Prepared on GaN Nanorod Template
(2010-02-15)
Kuo, C. H.
;
Chang, L. C.
;
Kuo, C. W.
;
Chi, G. C.
;
光電工程學系
We demonstrated the formation of GaN-based nanorod (NR) structure by using self-assemble Ni nanoislands as the etching mask. It was found that crystal quality of the GaN epilayer prepared on an NR GaN template was significantly better than that prepared with a conventional low-temperature GaN nucleation layer. With the NR GaN template, it was found that 20-mA light-emitting diode (LED) output power can be enhanced by 39.8%, as compared to the conventional LED.
Insight into the performance enhancement of double-gated polycrystalline silicon thin-film transistors with ultrathin channel
(2010-02-15)
Lin, Zer-Ming
;
Lin, Horng-Chih
;
Chen, Wei-Chen
;
Huang, Tiao-Yuan
;
電子工程學系及電子研究所
In this letter, characteristics of independently-controllable double-gated polycrystalline silicon (poly-Si) thin-film transistors (TFTs) with ultrathin channel are characterized and analyzed experimentally and theoretically. As compared with the single-gated mode where only one of the gates is used for driving the device, 1.3-2.1 fold increase in drive current is achieved under double-gated mode as the two gates are biased simultaneously for driving the device. A remarkable lowering of barrier height 7-12 meV in the latter case due to the coupling of the two gate biases is identified as the major origin for such performance enhancement.
Wavelength-Tunable InGaAs-Capped Quantum-Dot Infrared Photodetectors
(2010-02-15)
Lin, Wei-Hsun
;
Tseng, Chi-Che
;
Chao, Kuang-Ping
;
Mai, Shu-Cheng
;
Lin, Shih-Yen
Quantum-dot infrared photodetectors (QDIPs) with InGaAs capping layers are investigated. Compared with the standard QDIP with 2.5-mono-layer (ML) InAs QDs, the detection wavelength is shifted from 6 to 7.9 m for an 8-nm InGaAs-capped QDIP. By decreasing the QD coverage from 2.5 to 2.0 ML, an even longer detection wavelength 10.4 m is observed, which is attributed to the higher energy levels of the QD excited states resulted from the smaller QDs. By further increasing the capping layer thickness to 12 nm, longer detection wavelengths with broad response 10-18 m is observed for the InGaAs-capped QDIP.
Glass transition temperature enhancement of PMMA through copolymerization with PMAAM and PTCM mediated by hydrogen bonding
(2010-02-15)
Lin, Chien-Ting
;
Kuo, Shiao-Wei
;
Huang, Chih-Feng
;
Chang, Feng-Chih
;
應用化學系
A series of poly(methyl methacrylate-co-methacrylamide-co-tricyclodecyl methacrylate) (PMMA-co-PMAAM-co-PTCM) copolymers possessing high glass transition temperatures and high transparency are prepared. By incorporating the aliphatic tricyclodecyl methacrylate moiety into the PMMA-co-PMAA main chain results in high glass transition temperature and high transparency of PMMA-based polymeric material. The TCM content affects the fraction of hydrogen bonding in these terpolymers, small content of TCM does not sacrifice the fraction of hydrogen-bonded association in and does not cause T(g) decrease. The extent of free amide group plays the major role in dictating moisture absorption of terpolymers. The incorporation of TCM significantly reduces the moisture absorption of terpolymers due to its hydrophobic and bulky tricyclodecyl group. In addition, the TCM plays the role of inert diluent to convert portion of the strong self-associated hydrogen bonded amide groups into inter-associated hydrogen bonding between carbonyl groups of ester units and MAAM. (C) 2010 Elsevier Ltd. All rights reserved.
Polymeric Dopant Effects of Bent-Core Covalent-Bonded and Hydrogen-Bonded Structures on Banana-Shaped Liquid Crystalline Complexes
(2010-02-15)
Yang, Po-Jen
;
Wang, Ling-Yung
;
Tang, Chieh-Yin
;
Lin, Hong-Cheu
;
材料科學與工程學系
Two series of banana-shaped liquid crystalline (LC) H-bonded complexes HP(m)/CB(n) (i.e., bent-core H-bonded side-chain homopolymer HP mixed with bent-core covalent-bonded small molecule CB) and CP(m)/HB(n) (i.e., bent-core covalent-bonded side-chain homopolymer CP mixed with bent-core H-bonded small molecular complex HB) with various m/n molar ratios were developed. The bent-core covalent- and H-bonded structural moieties were homopolymerized in the banana-shaped LC H-bonded complexes HP(m)/CB(n) and CP(m)/HB(n), respectively. The influences of m/n molar ratios (polymeric moieties vs. small molecular moieties) on the mesomorphic and electro-optical properties of both banana-shaped LC H-bonded complexes HP(m)/CB(n) and CP(m)/HB(n) were investigated. The polar smectic phases could be achieved and stabilized by smaller contents of polymeric dopants in banana-shaped LC H-bonded complexes, such as HP1/CB10, HP1/CB15, CP1/HB10, and CP1/HB15, which possessed tunable spontaneous polarization (Ps) values according to the molar ratios of m/n, that is, lower Ps values obtained in H-bonded complexes HP(m)/CB(n), and CP(m)/HB(n) with higher ratios of H-bonded moieties (larger m/n molar ratios), respectively. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 764-774, 2010
Temperature-Dependent Electroluminescence Efficiency in Blue InGaN-GaN Light-Emitting Diodes With Different Well Widths
(2010-02-15)
Wang, C. H.
;
Chen, J. R.
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Chiu, C. H.
;
Kuo, H. C.
;
Li, Y. -L.
Temperature dependence of electroluminescence (EL) efficiency in blue InGaN-GaN multiple-quantum-well (MQW) light-emitting diodes (LEDs) with different well widths is systematically investigated. The EL efficiency at 300 K shows a maximum at the input current of 4, 10, and 60 mA for the LEDs with 1.5-, 2.0-, and 2.5-nm QWs, respectively. Nevertheless, the droop behavior at 80 K is mainly dominated by the low hole mobility and near independence on the QW thickness. According to the simulation results, it is found that the distinct efficiency droop behavior for the LEDs with different well widths at high and low temperature is strongly dependent on the effects of electron overflow and nonuniform hole distribution within the MQW region.
Lasing characteristics at different band edges in GaN photonic crystal surface emitting lasers
(2010-02-15)
Chen, S. W.
;
Lu, T. C.
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Hou, Y. J.
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Liu, T. C.
;
Kuo, H. C.
We have investigated the lasing characteristics of GaN-based two-dimensional photonic crystal surface emitting lasers (PCSELs) with different PC lattice constants by using angled resolved spectroscopy. Due to the Bragg diffraction theory, normalized frequency of lasing wavelength of PCSELs can be exactly matched with three distinct band-edge frequencies (Gamma 1, K2, and M3) in the photonic band diagram. The three band-edge frequencies (Gamma 1, K2, and M3) have different emission angles corresponding to the normal direction of the sample (0 degrees, 29 degrees, and 59.5 degrees).
文章產生系統及方法
(2010-02-16)
李嘉晃
;
余思翰
;
陳智維
本發明提供一種文章產生系統。該文章產生系統包含綜合語料庫、特定主題語料庫、判斷模組、決定模組、選取模組及組合模組。當特定主題被決定時，判斷模組根據綜合語料庫與特定主題語料庫產生對應於特定主題之複數個主題關鍵詞。決定模組根據複數個主題關鍵詞從特定主題語料庫中決定複數個填充字串。選取模組自複數個主題關鍵詞中選出複數個目標關鍵詞，並根據複數個目標關鍵詞從複數個填充字串中選出複數個候選填充字串。組合模組根據複數個目標關鍵詞與複數個候選填充字串形成與特定主題相關之文章。
數位式快速鎖定頻率合成器
(2010-02-16)
陳巍仁
;
楊松諭
本發明主要為一種數位式鎖相迴路頻率合成裝置，具有高速鎖定以及低相位雜訊特性。其中鎖相迴路由一相位偵測器、可控制振盪器、自動動態調整迴路增益之迴路濾波器、回授相位積分電路、參考相位積分電路所組成。在迴路鎖定過程中，透過自動動態調整迴路增益之迴路濾波器，偵測積分電路輸出資訊以及相位偵測電路輸出資訊，動態的調整迴路濾波器中直饋路徑以及積分路徑的增益，使迴路鎖定速度加快。本案並提出一種高速計數器的電路，透過一組非同步計數器、資料擷取暫存器與取樣相位產生器，達成高速低功率之計數器。
三維互動式顯示器及其三維座標偵測方法
(2010-02-16)
黃乙白
;
王國振
;
白宗緯
;
吳璧丞
本發明係揭露一種三維互動式顯示器及其三維座標偵測方法，利用安裝複數光柵片於一觸控面板上，使一觸控物接近此觸控面板所造成之陰影強度產生不對稱之分佈，再經由裝設於此觸控面板內之複數光源感測器偵測光源強度，其後藉由一處理單元，將此光源感測器所偵測到的光源強度做適當的運算以得到三維坐標。如此以提升此三維互動式顯示器在近距離的工作範圍，並且不須改變此三維互動式顯示器的製造程序與額外增加硬體設備。
具光電池充電式影像感測裝置
(2010-02-16)
林進燈
;
洪紹航
;
李俊彥
;
鍾仁峯
本發明是揭示一種具光電池充電式影像感測裝置，係是由互補式金氧半導體影像感測器利用充電核心電路之光電二極體本身特性，操作在光電池區(亦稱太陽能電池區)而非一般操作在光傳導區，利用太陽能電池儲能方式將外部光源儲存在電路內部，利用此方法將該影像感測器動作之感光、充電功能，利用在佈局(Layout)感光面積上擁有該兩種功能，而改善傳統必須在不同佈局面積上做單一動作，以節省佈局面積降低成本。
利用斜向沈積形成之奈米結構薄膜及其方法
(2010-02-16)
張家華
;
楊勁生
;
邱清華
;
余沛慈
;
郭浩中
本發明提出了一種利用斜向沈積技術形成之透明導電氧化物奈米結構及其方法。該方法使用電子槍來蒸鍍靶材,其蒸鍍基板設置在多個可轉動傾斜的平板上,並具有氣體控制閥控制氣體的通入,及一加熱源控制腔體內溫度,並於蒸鍍後進行退火製程,以改善薄膜結構與光電性質。
Method of symbol detection for MIMO dual-signaling uplink CDMA systems
(2010-02-16)
Ho
;
Chung-Lien
;
Wu
;
Jwo-Yuh
;
Lee
The invention provides a block-wise successive interference cancellation (SIC) detection algorithm for a general multi-input multi-output (MIMO) CDMA system over the frequency-selective channels, in which each user's data stream can be simultaneously applied with orthogonal space-time block encoding for transmit diversity or spatially multiplexing for high spectral efficiency according to the channel conditions. For such the considered dual-signaling system, the receiver could suffer from the large dimension data processing. A two-stage approach for block-wise SIC detection algorithm is thus proposed to further reduce the computational complexity.
利用超音波與電腦視覺偵測之自動導航裝置及其導航方法
(2010-02-16)
吳至仁
;
蔡雙圓
;
蔡文祥
本發明係揭露一種利用超音波與電腦視覺偵測之自動導航裝置及其導航方法，首先讓一使用者帶領一自動導航裝置，使自動導航裝置學習並規劃一航行路徑，接著使自動導航裝置獨立導航，且於此時可利用超音波與電腦視覺偵測周圍環境，並藉此比對航行路徑，以校正自動導航裝置之實際航行路線，本發明可讓不會使用電腦的普羅大眾，不必接觸電腦，也能使用自動移動裝置作互動，加以本發明是利用電腦視覺及超音波偵測，更能降低製造商在硬體方面的成本。
色序法顯示器之顯示方法
(2010-02-16)
魏景明
;
黃乙白
;
林芳正
;
謝漢萍
本發明係為一種色序法顯示器之顯示方法，其包括下列步驟：分析目標影像；輸出第一色場影像；輸出第二色場影像；以及輸出第三色場影像。由於輸出之每一色場影像皆可顯示全彩之影像，且第一色場影像可正確顯示目標影像中之一色光之影像強度，並有效降低第二及第三色場影像之彩度及亮度，所以可有效改善色分離現象。
Identification and clinical association of anti-cytokeratin 18 autoantibody in COPD
(2010-02-16)
Kuo, Yung-Bin
;
Chang, C. Allen
;
Wu, Yao-Kuang
;
Hsieh, Meng-Jer
;
Tsai, Chung-Hsien
The etiology of chronic obstructive pulmonary disease (COPD) remains unclear. A mechanism involving the autoimmune reaction in the pathogenesis of COPD has been proposed but not confirmed. The aim of this study was to investigate whether serum autoantibodies against pulmonary cellular proteins are present in COPD patients and to identify their autoantigens if possible. Samples from 50 COPD patients and 42 control subjects were studied. Circulating autoantibodies were detected by Western blot. Immunoprecipitation and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry were used to identify the autoantigens. Autoantibodies against pulmonary cellular antigens were found in the sera of COPD patients. Specifically, an autoantibody against the 45-kDa human cytokeratin 18 protein was found in 76.0% of COPD patients and 23.8% of control subjects (p < 0.001). Furthermore, the cytokeratin 18 autoantibody level was positively correlated with the FEV(1) (L) (p = 0.013) and FEV(1) (%pred.) (p, = 0.043) values observed in COPD patients. This study identified the pulmonary epithelial cytokeratin 18 protein as a COPD-associated autoantigen and found that anti-cytokeratin 18 autoantibodies were prevalent in COPD patients. Our results support the hypothesis that humoral autoimmunity may be involved in the pathogenesis of COPD. (C) 2009 Elsevier B.V. All rights reserved.
Spatiotemporal Characterization of Phagocytic NADPH Oxidase and Oxidative Destruction of Intraphagosomal Organisms in Vivo Using Autofluorescence Imaging and Raman Microspectroscopy
(2010-02-17)
Chang, Wei-Tien
;
Yang, Yi-Cyun
;
Lu, Hsueh-Han
;
Li, I-Lin
;
Liau, Ian
The ability to generate antimicrobial reactive-oxygen species (ROS) by reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase is critical for the host to defend against invading microbes. We have demonstrated the application of confocal autofluorescence microscopy and Raman microspectroscopy to characterize dynamically the phagocytic process of living macrophages in a label-free manner. In particular, we visualized the translocation of NADPH oxidases in livin macrophages that are undergoing phagocytosis of invading yeasts and monitored dynamically the change at the molecular level of single intraphagosomal yeasts caused by phagocytic ROS.
Nanostructured thin-film formed by utilizing oblique-angle deposition and method of the same
(2010-02-18)
Chang, Chia-Hua
;
Yang, Chin-Sheng
;
Chiu, Ching-Hua
;
Yu, Pei-Chen
;
Kuo, Hao-Chung
The present invention discloses a transparent conductive nanostructured thin-film by oblique-angle deposition and method of the same. An electron beam system is utilized to evaporate the target source. Evaporation substrate is disposed on a plurality of adjustable sample stage. Multiple gas control valve and heat source is provided to control the gas flow and temperature within the process chamber. An annealing process is performed after the evaporation to improve the thin-film structure and optoelectronic properties.