Browsing by Issue Date, starting with "2009-06-15"

Now showing 1 - 20 of 50483

Near-infrared silicon quantum dots metal-oxide-semiconductor field-effect transistor photodetector
(2009-06-15)
Shieh, Jia-Min
;
Yu, Wen-Chien
;
Huang, Jung Y.
;
Wang, Chao-Kei
;
Dai, Bau-Tong
A fully silicon-based metal-oxide-semiconductor field-effect transistor is demonstrated for the detection of near-infrared light. Si nanocrystals (nc-Si) are synthesized in the nanopore channels of mesoporous silica (MS) inserted between two oxide layers to form a complete gate structure of polycrystalline Si/SiO(2)/nc-Si-in-MS/SiO(2) with a polycrystalline Si electrode. Illuminating the gate with near-infrared light, a photoresponsivity as high as 2.8 A/W at 1.55 mu m can be achieved. The improved photoresponsivity is attributed to from optical transitions via interface states and a current amplification mechanism of the device.
Toxicity and quantitative structure-activity relationships of benzoic acids to Pseudokirchneriella subcapitata
(2009-06-15)
Lee, Po Yi
;
Chen, Chung Yuan
;
環境工程研究所
;
Institute of Environmental Engineering
The present study presents the toxicity data of benzoic acid and its derivatives on Pseudokirchneriella subcapitata, in terms of EC50 and NOEC values. Median effective concentrations (EC50) range from 0.55 to 270.7 mg/L (based on final yield) and 1.93 to 726.3 mg/L (based on algal growth rate). No-observed-effect concentration (NOEC) is within the range of <0.0057-179.9 mg/L. From both the NOEC and EC50 values, it was found that, 2,4,6-trihydroxybenzoic acid, 4-chlorobenzoic acid, 3-bromobenzoic acid, 4-bromobenzoic acid, 2,6-dihydroxybenzoic acid. and 2,3,4-trihydroxybenzoic acid possess much higher risks to the aquatic organisms as compared to the other benzoic acids. These data are useful for risk assessment and protection of the aquatic environments, because such information is not available in the existing toxicological databases. The toxicity of halogenated benzoic acids was found to be directly related to the compound's hydrophobicity (the logarithm of the 1-octanol/water partition coefficient, logKow). On the other hand, the number of hydroxyl groups (N(OH)) had a determinant influence to the toxicity of hydroxybenzoic acids. Quantitative structure-activity relationships were established to correlate the observed toxicity with logKow and N(OH) values. These statistical correlations are highly significant with the predictive power Q ranging from 0.896 to 0.955. Furthermore, in terms of the species sensitivity, the luminescent bacteria (Microtox) and the alga P. subcapitata appeared to be more susceptible to benzoic acids than the water flea and ciliate. (C) 2008 Elsevier B.V. All rights reserved.
Improved upper and lower bounds on the optimization of mixed chordal ring networks
(2009-06-15)
Lan, James K.
;
Liu, Victor W.
;
Chen, Chiuyuan
;
應用數學系
;
Department of Applied Mathematics
Recently, Chen, Hwang and Liu [S.K. Chen, F.K. Hwang, Y.C. Liu, Some combinatorial properties of mixed chordal rings, J. Interconnection Networks 1 (2003) 3-16] introduced the mixed chordal ring network as a topology for interconnection networks. In particular, they showed that the amount of hardware and the network structure of the mixed chordal ring network are very comparable to the (directed) double-loop network, yet the mixed chordal ring network can achieve a better diameter than the double-loop network. More the mixed chordal ring network can achieve diameter about root 2N as compared precisely, to root 3N for the (directed) double-loop network, where N is the number of nodes in the network. One of the most important questions in interconnection networks is, for a given number of nodes, how to find an optimal network (a network with the smallest diameter) and give the construction of such a network. Chen et al. [S.K. Chen, F.K. Hwang, Y.C. Liu, Some combinatorial properties of mixed chordal rings, J. Interconnection Networks 1 (2003) 3-16] gave upper and lower bounds for such an optimization problem oil the mixed chordal ring network. In this paper, we improve the upper and lower bounds as 2[root N/2] +1 and [root 2N - 3/2], respectively. In addition, we correct some deficient contexts in [S.K. Chen, F.K. Hwang, Y.C. Liu, Some combinatorial properties of mixed chordal rings, J. Interconnection Networks 1 (2003) 3-16]. (C) 2009 Elsevier B.V. All rights reserved.
Symplectic synchronization of different chaotic systems
(2009-06-15)
Ge, Zheng-Ming
;
Yang, Cheng-Hsiung
;
機械工程學系
;
Department of Mechanical Engineering
In this paper, a new symplectic synchronization of chaotic systems is studied. Traditional generalized synchronizations are special cases of the symplectic synchronization. A sufficient condition is given for the asymptotical stability of the null solution of ail error dynamics. The symplectic synchronization may be applied to the design of secure communication. Finally, numerical results arc studied for a Quantum-CNN oscillators synchronized with a Rossler system in three different cases. (c) 2007 Elsevier Ltd. All rights reserved.
Poly-silicon nanowire field-effect transistor for ultrasensitive and label-free detection of pathogenic avian influenza DNA
(2009-06-15)
Lin, Chih-Heng
;
Hung, Cheng-Hsiung
;
Hsiao, Cheng-Yun
;
Lin, Horng-Chih
;
Ko, Fu-Hsiang
Enhanced surveillance of influenza requires rapid, robust. and inexpensive analytical techniques capable of providing a detailed analysis of influenza virus strains. Functionalized poly-crystalline silicon nanowire field-effect transistor (poly-SiNW FET) was demonstrated to achieve specific and Ultrasensitive (at fM level) detection of high pathogenic strain virus (H5 and H7) DNA of avian influenza (AI) which is an important infectious disease and has an immediate need for surveillance. The poly-SiNW FET was prepared by a simple and low-cost method that is compatible with Current commercial semiconductor process without expensive E-beam lithography tools for large-scale production. Specific electric changes were observed for AI virus DNA sensing when nanowire surface of poly-SiNW FET was modified with complementary captured DNA probe and target DNA (H5) at fM to pM range Could be distinguished. With its excellent electric properties and potential for mass commercial production, poly-SiNW FET car, be developed to become a portable biosensor for field use and point-of-care diagnoses. (C) 2009 Elsevier B.V. All rights reserved.
Analysis of GaAs/GaSb/GaAs structures under optical excitation considering surface states as an electron reservoir (vol 105, 103515, 2009)
(2009-06-15)
Hsieh, Hong-Wen
;
Yen, Shun-Tung
;
電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
Blinking suppression of colloidal CdSe/ZnS quantum dots by coupling to silver nanoprisms
(2009-06-15)
Yuan, C. T.
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Yu, Pyng
;
Tang, Jau
;
光電工程學系
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Department of Photonics
Fluorescence blinking of quantum dots (QDs) is a common but annoying behavior for practical applications as fluorescent markers or single photon sources. We demonstrate here, by coupling colloidal CdSe/ZnS QDs to silver nanoprisms, fluorescence blinking behavior can be suppressed. For most of coupled QDs, two emissive states with different fluorescence intensities and lifetime were observed. We suggest that energy transfer could play an important role in suppressing blinking behavior.
Charge pumping method for photosensor application by using amorphous indium-zinc oxide thin film transistors
(2009-06-15)
Liu, Po-Tsun
;
Chou, Yi-Teh
;
Teng, Li-Feng
;
光電工程學系
;
顯示科技研究所
The study investigated the photoreaction behavior of amorphous indium-zinc oxide thin film transistor (a-IZO TFT), which was thought to be insensitive to visible light. The obvious threshold voltage shift was observed after light illumination, and it exhibited slow recovery while returning to initial status. The photoreaction mechanism is well explained by the dynamic equilibrium of charge exchange reaction between O(2(g)) and O(2) in a-IZO layer. A charge pumping technique is used to confirm the mechanism and accelerate recoverability. Using knowledge of photoreaction behavior, an operation scheme of photosensing elements consist of a-IZO TFT is also demonstrated in this work.
Micropatterning of perfluoroalkyl self-assembled monolayers for arraying proteins and cells on chips
(2009-06-15)
Kira, Atsushi
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Okano, Kazunori
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Hosokawa, Yoichiroh
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Naito, Akira
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Fuwa, Koh
Organosilane self-assembled monolayers (SAMs) with perfluoroalkyl groups (R(f)) on glass surfaces were used for arraying proteins and cells on chips. Quartz crystal microbalance measurements confirmed the inhibition of protein adsorption on R(f)-SAM-modified surfaces and showed efficient adsorption on hydroxyl-, carboxyl-, and amino group-modified surfaces. The characteristics of R(f)-modified surfaces were evaluated using solvent contact angle measurement and Fourier transform infrared (FTIR) spectroscopy. The R(f) surface was highly water-and oil-resistant, as inferred from the contact angles of water, oleic acid, and hexadecane. Specific peaks of IR spectra were detected in the region from 1160 to 1360 cm(-1). Etching with dry plasma completely exfoliated the R(f)-SAM, exposing the underlying intact glass surface. Modi. cation conditions were optimized using contact angle and FTIR measurements. After dry plasma processing, the contact angles of all solvents became undetectable, and the IR peaks disappeared. Micrometer scale protein and cell patterns can be fabricated using the proposed method. Protein adsorption on micropatterned R(f)-SAM-modified chips was evaluated using fluorescence analysis; protein adsorption was easily controlled by patterning R(f)-SAM. PC12 and HeLa cells grew well on micropatterned R(f)-SAM-modified chips. Micropatterning of R(f)-SAM by dry plasma treatment with photolithography is useful for the spatial arrangement of proteins and cells. (C) 2009 Elsevier B. V. All rights reserved.
Measurement of multi-wavelength optical amplifier by using the I/O power-curve fitting technique
(2009-06-15)
Huang, Ting-Tsan
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Sheu, Lih-Gen
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Chi, Sien
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光電工程學系
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Department of Photonics
A low-cost and accurate measurement scheme for characterizing multi-wavelength optical amplifiers is experimentally demonstrated by using an amplified spontaneous emission source and a DWDM multiplexer. By linearly fitting the input and output optical spectral densities, the gain and noise figure of the optical amplifier are determined. The measured results agree well with the data obtained by time-domain-extinction method. (C) 2009 Elsevier B.V. All rights reserved.
A study of ultraviolet-curable organic/inorganic hybrid nanocomposites and their encapsulating applications for organic light-emitting diodes
(2009-06-15)
Chang, Ming-Hua
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Hsieh, Tsung-Eong
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Huang, Bohr-Ran
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Hsieh, Huai-En
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Juang, Fuh-Shyang
UV-curable organic/inorganic hybrid nanocomposites have been successfully synthesized with polymer monomers (tetramethoxysi lane (TMOS)/3-glycidoxypropyl-trimethoxysilane (GPTMS)) nano-fillers (silica/alumina), curing agents (bisphenol A (BPA)), and photoinitiators (triaryl sulfonium hexafluoroantimonate (TSH)) by in situ polymerization. Their thermal stability, coefficient of thermal expansion (CFE), adhesion strength, and gas barrier capability have also been investigated with thermogravimetry analysis (TGA), thermomechanical analysis (TMA), micro-computer universal testing machine and moisture penetration tests. Experimental results indicate that nano-fillers are completely homogeneously dispersed in the polymer matrices and the increase of nano-fillers in the nanocomposites causes the raise of decomposition temperature (Td) as well as gas resistance and the reduction of CTE as well as adhesion strength. Because lab-made organic/inorganic hybrid nanocomposites have been discovered to exhibit excellent gas barrier properties, we have also applied them for the encapsulation of organic light-emitting diodes (OLEDs) and flexible OLEDs. With lab-made nanocomposite cl, the lifetimes of OLEDs and flexible OLEDs can be successfully lengthened to 92 and 36 h, respectively, whereas those of OLEDs and flexible OLEDs without encapsulation are 11 and 7 h, respectively. (C) 2008 Elsevier B.V. All rights reserved.
Exploring the origin of the directional emission from a microcavity with a large-aperture surface-emitting laser
(2009-06-15)
Chen, Ross C. C.
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Yu, Y. T.
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Huang, Y. J.
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Chen, C. C.
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Chen, Y. F.
The origin of the direction emission from a microcavity is investigated with a large-aperture surface-emitting laser with an equilateral-triangular shape. Experimental results reveal that a wide-spread eigen-mode and a localized superscar mode can display quite similar far-field directional emissions. This experimental finding is theoretically confirmed with the quantum-billiard wave function and the approximation of the paraxial propagation. (C) 2009 Optical Society of America
智慧型語音純化系統及其方法
(2009-06-16)
胡竹生
;
楊佳興
本發明係提供一種智慧型語音純化系統及其方法,其係利用智慧型語音純化系統純化受干擾之語音訊號與消除回音的干擾。智慧型語音純化包括以USB為傳輸介面的數位麥克風陣列語音擷取系統與語音純化技術。相較於先前技術,本發明能增加整體電路的抗雜訊能力並縮小電路體積。另外,本發明採用常見的USB傳輸介面,藉此提升語音擷取系統的方便性與擴充性。在語音純化系統方面,本發明能適用於各種不同干擾源的吵雜環境並且不需考慮麥克風匹配問題以降低製作成本。
具自我感知之適應性功率控制系統與判別電路運作狀態的方法
(2009-06-16)
謝維致
;
黃威
本發明提供一種具有自我感知之適應性功率控制系統與判別電路運作狀態的方法,其中該控制系統至少包含多模式功率閘網路、電流監測轉譯器、可變門檻比較器、時脈長度偵測器及雙向平移暫存器。該多模式功率閘網路係由N通道電晶體或P通道電晶體組成,經由監測搭載電路所汲取之電流量,可判定電路現處於運算亦或穩定狀態,因此不需使用電路傳輸延遲匹配電路,在配合其它週邊電路之情況下,供給電流可被下調至最低可接受的程度,使電路盡量用掉所有可用的時脈長度。此外,本發明對於頻率變化也具有自我感知調變功能,故可使電路在各種頻率下之功率消耗為最低,以達最佳能源效益。
多模多平行度資料交換方法及其裝置
(2009-06-16)
陸志豪
;
林建青
;
李鎮宜
;
張錫嘉
;
許雅三
本發明係提出一種多模多平行度資料交換方法及其裝置,其係可應用於查核節點運算器或是一位元節點運算器。本發明係包含複製部份或全部之原始位移資料作為複製位移資料,並將原始位移資料和複製位移資料組成一資料區塊;並以此資料區塊為單位,對此資料區塊進行位移,以便自位移後之資料區塊中取出位移資料。本發明係使用一個最大尺寸位移電路與複製部份的資料,即可支援不同位移尺寸的規格需求,以最小複雜度完成多種尺寸位移器之功能。
Excitation properties of the H3 defect center in diamond: A theoretical study
(2009-06-16)
Lin, Chih-Kai
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Chang, Huan-Cheng
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Hayashi, M.
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Lin, S. H.
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應用化學系
Theoretical calculations on electronic excitation energies and absorption cross sections of the H3 defect center in diamond were performed. We constructed model clusters with up to 180 atoms to imitate the local environment of the defect center and conducted first-principle calculations. TD-DFT predicted most accurately vertical excitation energy, whereas TD-HF and CIS provided rough estimations for one- and two-photon absorption cross sections. It was found that a model cluster with a diameter larger than similar to 1.0 nm is required, while relatively low-cost level of theory and basis set are sufficient for characterizing the excitation properties. (c) 2009 Elsevier B.V. All rights reserved.
壓縮反應時間之畫面控制訊號產生方法
(2009-06-16)
林芳正
;
黃乙白
;
魏景明
;
謝漢萍
本發明為一種壓縮反應時間之畫面控制訊號產生方法,其包括下列步驟:分析輸入影像訊號;產生畫面之第一參考液晶控制訊號;設定第二液晶控制訊號範圍,並產生第二參考液晶控制訊號;根據第一參考液晶控制訊號及第二參考液晶控制訊號產生第二背光控制訊號;以及根據第二背光控制訊號產生每一畫素之第二液晶控制訊號。藉由將第二液晶控制訊號控制在第二液晶控制訊號範圍中,以縮短液晶的反應時間,並提升液晶顯示器之影像品質。
在網路流量中分類所屬應用程式之方法
(2009-06-16)
林盈達
;
彭偉豪
;
賴源正
;
呂俊男
;
陳一瑋
本發明提出了一種網路流量分類方法,其利用網路傳輸層行為特徵以及應用程式連線封包大小分佈與結合埠關聯特性,做為辨認流量中所屬應用程式之依據。利用應用程式在傳輸層中行為計算出的向量値與已知的代表特徵點比對辨認,並且利用埠關聯的特性一併將與應用程式相關的連線辨識出來。
Molecular Dynamics insight into the role of tertiary (foldon) interactions on unfolding in Cytochrome c
(2009-06-16)
Tsai, M. Y.
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Morozov, A. N.
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Chu, K. Y.
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Lin, S. H.
;
交大名義發表
Hydrogen exchange experiments reveal the existence of a foldon structure in Cytochrome c. We performed constant temperature Molecular Dynamics simulations of Cytochrome c to investigate the macroscopic behavior of the foldons. The results showed that the tertiary interactions in Cytochrome c play an important role in the stabilization of the N- and C-terminal helices. We also observed the macroscopic behavior of a black foldon in the process of thermal unfolding. Our results support that Cytochrome c folding occurs in accordance with the classical pathway concept of Levinthal. (c) 2009 Elsevier B.V. All rights reserved.
顯示色光、圖形與數字的指示燈號
(2009-06-16)
羅志偉
一種利用多色發光二極體的指示燈號,指示燈號中使用的圖形,搭配色光的變化與計時顯示的數字,將顏色、圖形與數字整合一起,能夠運用於一般運輸系統、公共場所之指示、警告或管制之用,並且便利具有顏色辨識障礙的人判讀指示燈號。