Browsing by Issue Date, starting with "2011-06-15"

Now showing 1 - 20 of 41074

Rapid and sensitive detection of cancer cells by coupling with quantum dots and immunomagnetic separation at low concentrations
(2011-06-15)
Hsieh, Yi-Heui
;
Lai, Lee-Jene
;
Liu, Shih-Jen
;
Liang, Keng S.
;
電子物理學系
This work presents a rapid and sensitive method for detecting cancer cells at low concentration. In this method, two biomarkers of T-help cancer cells are detected simultaneously. One biomarker is conjugated with magnetic beads to separate T-help cell from the mixed cells and the other biomarker, associated with quantum dots, is used to detect fluorescence. The specific T-help cells can be quantified using the relationship between the QD fluorescence intensity and the cell frequency following magnetic separation. The intensity of fluorescence increases linearly with the frequency of T-help cells from 10(-7) to 10(-3), and neither B cells nor red blood cells interfere with the detection of T-help cells. Moreover, the total detection time is under 15 min, even though the frequency of specific T-help cells is as low as 5 x 10(-7). The numerous advantages of detecting specific cells at low concentration using the presented method include ease of preparation, low cost, fast detection, and high sensitivity. (C) 2011 Elsevier B.V. All rights reserved.
Influence of annealing temperature on the structural, optical and mechanical properties of ALD-derived ZnO thin films
(2011-06-15)
Yen, C. -Y.
;
Jian, S. -R.
;
Chen, G. -J.
;
Lin, C. -M.
;
Lee, H. -Y.
ZnO thin films grown on Si(1 1 1) substrates by using atomic layer deposition (ALD) were annealed at the temperatures ranging from 300 to 500 degrees C. The X-ray diffraction (XRD) results show that the annealed ZnO thin films are highly (0 0 2)-oriented, indicating a well ordered microstructure. The film surface examined by the atomic force microscopy (AFM), however, indicated that the roughness increases with increasing annealing temperature. The photoluminescence (PL) spectrum showed that the intensity of UV emission was strongest for films annealed at 500 degrees C. The mechanical properties of the resultant ZnO thin films investigated by nanoindentation reveal that the hardness decreases from 9.2 GPa to 7.2 GPa for films annealed at 300 degrees C and 500 degrees C, respectively. On the other hand, the Young's modulus for the former is 168.6 GPa as compared to a value of 139.5 GPa for the latter. Moreover, the relationship between the hardness and film grain size appear to follow closely with the Hall-Petch equation. (C) 2011 Elsevier B. V. All rights reserved.
A tunable terahertz filter and its switching properties in terahertz region based on a defect mode of a metallic photonic crystal
(2011-06-15)
Kim, Yong Sung
;
Lin, Shawn-Yu
;
Wu, Hsin-Ying
;
Pan, Ru-Pin
;
電子物理學系
We theoretically investigate and discuss an electrically tunable terahertz filter design and its optical switching properties based on the defect mode of a woodpile metallic photonic crystal (MPC). The model filter design is based on a dual use of an MPC as a resonator and as electrodes with a liquid crystal used as a defect layer. The static and the dynamic responses of a realistic liquid crystal are obtained using the Oseen-Frank elastic continuum theory, and the corresponding transmission spectra are calculated using an analytic modal expansion method combined with a transfer-matrix method. The tuning range of f = 1.430 similar to 1.577 THz and the order of milliseconds switching property are observed in our design. (C) 2011 American Institute of Physics. [doi:10.1063/1.3603009]
Reduction of Efficiency Droop in InGaN Light-Emitting Diode Grown on Self-Separated Freestanding GaN Substrates
(2011-06-15)
Chao, Chu-Li
;
Xuan, Rong
;
Yen, Hsi-Hsuan
;
Chiu, Ching-Hsueh
;
Fang, Yen-Hsiang
Using a GaN nanorod template in a hydride vapor phase epitaxy (HVPE) system can manufacture a freestanding GaN (FS-GaN) substrate with threading dislocation densities down to similar to 10(7) cm(-2). In this letter, we report InGaN/GaN multiple-quantum-well light-emitting diodes (LEDs) grown on this FS-GaN substrate. The defect densities in the homoepitaxially grown LEDs were substantially reduced, leading to improved light emission efficiency. Compared with the LED grown on sapphire, we obtained a lower forward voltage, smaller diode ideality factor, and higher light-output power in the same structure grown on FS-GaN. The external quantum efficiency (EQE) of LEDs grown on FS-GaN were improved especially at high injection current, which brought the efficiency droop phenomenon greatly reduced at high current density.
Strain-induced magnetization change in patterned ferromagnetic nickel nanostructures
(2011-06-15)
Bur, Alexandre
;
Wu, Tao
;
Hockel, Joshua
;
Hsu, Chin-Jui
;
Kim, Hyungsuk K. D.
We report strain-induced coercive field changes in patterned 300 x 100 x 35 nm(3) Ni nanostructures deposited on Si/SiO(2) substrate using the magnetoelastic effect. The coercive field values change as a function of the applied anisotropy strain (similar to 1000 ppm) between 390 and 500 Oe, demonstrating that it is possible to gradually change the coercive field elastically. While the measured changes in coercive field cannot be accurately predicted with simple analytical predictions, fairly good agreement is obtained by using a micromagnetic simulation taking into account the influence of nonuniform strain distribution in the Ni nanostructures. The micromagnetic simulation includes a position dependant strain-induced magnetic anisotropy term that is computed from a finite element mechanical analysis. Therefore, this study experimentally corroborates the requirement to incorporate mechanical analysis into micromagnetic simulation for accurately predicting magnetoelastic effects in patterned ferromagnetic nanostructures. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3592344]
Synergistic Inhibition of Enterovirus 71 Replication by Interferon and Rupintrivir
(2011-06-15)
Hung, Hui-Chen
;
Wang, Hsiang-Ching
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Shih, Shin-Ru
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Teng, I-Fang
;
Tseng, Ching-Ping
Methods. Through a bioinformatics analysis, several cellular proteins in the IFN response pathway were identified as susceptible substrates that might be degraded by the EV71-encoded 3C protease (3C(pro)). Results. Indeed, IRF9 was shown to be vulnerable to 3C(pro) cleavage, as revealed by enzyme-based and cell-based assays. Thus, the IFN-mediated antiviral mechanism compromised by the viral 3C(pro) in EV71-infected cells may be accountable, at least partially, for that IFN-alpha cannot inhibit EV71 replication. Because rupintrivir (AG7088) is known to be an effective EV71 inhibitor, we investigated the effects of the combination of rupintrivir and IFN-alpha on EV71 replication and found that they strongly synergized with each other in inhibiting EV71 replication. Conclusions. Because rupintrivir was shown to be generally tolerable in earlier clinical investigations, it is worth evaluating whether a combination of rupintrivir and IFN-alpha could be an effective treatment for EV71.
Generation of Two-Dimensional Optical Reference Signals Based on Parametric Minimum Cross Entropy
(2011-06-15)
Su, Yi-Sheng
;
Wu, Tsung-Cheng
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Wang, Chung-Hsuan
;
Chang, Min-Kuan
;
電機工程學系
In this letter, a novel design of two-dimensional (2-D) zero reference codes (ZRCs) based on parametric minimum cross entropy (PMCE) is proposed to generate 2-D optical zero reference signals (ZRSs) with low second maximum for grating alignment systems. An optical ZRS is necessary to obtain an absolute measurement in grating alignment systems. A method to acquire an optical ZRS is by means of illuminating two identical superimposed ZRCs. Because the movement between the two ZRCs is in two-axis, 2-D ZRCs are required. However, they are hard to design due to the high computational complexity, especially for large codes. The proposed PMCE method not only reduces the second maximum of 2-D optical ZRSs, but also decreases the computational complexity. Simulation results indicate that there are 8.33%similar to 22.22% reductions in the second maximum of several 2-D optical ZRSs, as compared with those of the recently proposed cross-entropy (CE) method. The PMCE method proves to be a powerful tool for the design of 2-D ZRCs.
Multi-Functional Light Emitter Based on Band-Edge Modes Near Gamma-Point in Honeycomb Photonic Crystal
(2011-06-15)
Lee, Po-Tsung
;
Lu, Tsan-Wen
;
Sio, Kuan-Un
;
光電工程學系
;
Department of Photonics
In this report, we demonstrate multi-functional light emitter based on band-edge modes near Gamma-point in a two-dimensional honeycomb photonic crystal slab. Different band-edge modes near Gamma-point are identified, including the monopole (Gamma(2)), dipole (Gamma(4,5)) and quadrupole (Gamma(6,7)) modes. The monopole and quadrupole modes lasing are observed with high side-mode suppression-ratio of 35 dB and high index sensitivity of 375 nm per refractive index unit, which shows their potential in optical micro-laser and index sensor applications. Over five-fold photoluminescence enhancement with broad band-width of 100 nm from the dipole mode is also observed at room temperature, which shows the advantage of honeycomb lattice structure for designing high brightness light emitting diodes.
Self-protected ring-star-architecture TDM passive optical network with triple-play management
(2011-06-15)
Yeh, C. H.
;
Chow, C. W.
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Liu, Y. L.
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光電工程學系
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Department of Photonics
A new self-protected apparatus in ring-star-architecture for time division multiplexed passive optical network (TDM-PON) against fiber-fault; together with triple-play management in optical layer is proposed and investigated. Different scenarios of fiber-fault locations are also discussed and analyzed. Besides, the performance of data traffics in both uplink and downlink directions are also measured and studied. Standard CAN video signal distribution to each ONUs is also performed, showing the proposed access network cannot only have self-restored function, but also can manage triple-play services in the optical layer. (C) 2011 Elsevier B.V. All rights reserved.
Characterization of Rayleigh backscattering performance of CS-SSB signal in carrier distributed passive optical network
(2011-06-15)
Wang, C. H.
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Yeh, C. H.
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Chow, C. W.
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Wu, Y. F.
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Shih, F. Y.
Rayleigh backscattering (RB) is an intrinsic phenomenon when light propagating in fiber and its level is fixed by the fiber type and the network configuration used. Thus. RB noise would be one of the major impairments in a carrier distributed passive optical network (PON). Previously demonstrated carrier suppressed subcarrier-amplitude modulated phase shift keying (CSS-AMPSK) modulation may be useful to effectively mitigate the RB noise. However, this modulation is basically a carrier suppressed double sidebands modulation (CS-DSB) format, in which the same information is carried by the two sidebands with equal magnitude. This is not very power-efficient for PON. Here, we further extend our RB studies by using carrier suppressed single sideband non-return-to-zero (CS-SSB-NRZ) modulation. We experimentally characterize the CS-SSB-NRZ modulation when subjected to both contributions of RB: Carrier-RB and Signal-RB. Then, numerical simulations are performed, and the results are in good match with the experiment. Finally, upstream transmission experiment is performed showing the feasibility of using the CS-SSB-NRZ signal for the carrier distributed PON. The RB performance of the SSB-NRZ signals transmitted at different distances and driven at different radio-frequency (RF) f(s) is also investigated. (C) 2011 Elsevier B.V. All rights reserved.
Inverted organic solar cell and method for manufacturing the same
(2011-06-16)
Chen Fang-Chung
;
Wu Jyh-Lih
;
Hung Yi
An inverted organic solar cell and a method for manufacturing the same are disclosed, wherein the inverted organic solar cell comprises: a substrate; a first electrode disposed on the substrate; an active layer disposed on the first electrode; an optical spacer containing a buffer layer and an optical interfacial layer, wherein the buffer layer is laminated on the active layer, the optical interfacial layer is laminated on the buffer layer, and the buffer layer is disposed between the active layer and the optical interfacial layer; and a second electrode disposed on the optical spacer. The introduction of the optical spacer with a favorable thickness can enhance light absorption in the active layer, and therefore the power conversion efficiency of the organic solar cell can be improved.
流體式光波導元件及其形成方法
(2011-06-16)
范士岡
;
簡家齊
;
盧羿彣
本發明提供一種流體式光波導元件及其形成方法，其是在包層流體中，藉由施加電場方式，驅動纖核流體於電極上。由於纖核流體是被電場所定義，所以各種二維形狀之纖核液體皆可藉由施加電壓所在的電極圖形上形成。本發明之流體式光波導元件擁有流體界面較平滑的優點，而且穩定的纖核與包層流體會消除流體流動時所產生的散射損失。
控制催化金屬晶粒形成之方法
(2011-06-16)
陳健章
;
鄭裕庭
;
許倫豪
;
任楷
一種控制催化金屬晶粒形成之方法，利用催化金屬薄膜在熔融狀態下形成金屬液滴，並於具有疏水特性之斜面上發生滾動，進而聚合形成單一催化金屬晶粒於斜面底部，藉此，可以精確地控制催化金屬晶粒形成的位置，同時，可藉由調整催化金屬薄膜的厚度與斜面之尺寸來形成適當大小的催化金屬晶粒，以成長具有單一與定位特性之一維奈米結構，並藉以運用於半導體積體電路製程。
倒置式有機太陽能元件及其製作方法
(2011-06-16)
陳方中
;
吳志力
;
洪毅
本發明係有關於一種倒置式有機太陽能元件及其製作方法，其中，倒置式有機太陽能元件係包括：一基板；一第一電極，係位於基板上；一有機主動層，係位於第一電極上；一光學間隙物，其包括一緩衝層、以及一光學介面層，緩衝層係位於有機主動層上，而光學介面層係層疊於緩衝層上，使緩衝層位於有機主動層與光學介面間；以及一第二電極，係位於光學間隙物上。藉由設置此適當厚度之光學間隙物，可增加有機主動層光的吸收，進而提升有機太陽能元件之能量轉換效率。
DEVICE AND METHOD FOR EXPRESSING ROBOT AUTONOMOUS EMOTIONS
(2011-06-16)
SONG Kai-Tai
;
Han Meng-Ju
;
Lin Chia-How
A device for expressing robot autonomous emotions comprises: a sensing unit; a user emotion recognition unit, recognizing current user emotional states after receiving sensed information from the sensing unit, and calculating user emotional strengths based on the current user emotional states; a robot emotion generation unit, generating robot emotional states based on the user emotional strengths; a behavior fusion unit, calculating a plurality of output behavior weights by a fuzzy-neuro network based on the user emotional strengths and a rule table; and a robot reaction unit, expressing a robot emotional behavior based on the output behavior weights and the robot emotional states.
Self-supporting Polymer from a POSS Derivative
(2011-06-16)
Cheng, Chih-Chia
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Yen, Ying-Chieh
;
Chang, Feng-Chih
;
應用化學系
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Department of Applied Chemistry
A new polyhedral oligomeric silsesquioxane macromer, octakis[N-(6-aminopyridin-2-yl)-undecanamide-10-dimethyl-siloxy]silsesquioxane (POSS-C11-Py), containing eight diaminopyridine arms, is able to self-assemble to form a physically crosslinked polymer-like structure with good mechanical properties (tensile strength = 46.1 MPa, tensile modulus = 0.58 GPa, elongation = 49.3%) through quadruple hydrogen bonding interactions between these arms. POSS-C11-Py is the first organic/inorganic supermolecule possessing polymer-like mechanical properties as a result of self-complementary interactions, providing a potential route toward the design and fabrication of polymer-like supramolecular materials.
The role of information searches in investment choice variation: Digital information, advice seeking and heuristics
(2011-06-18)
Tseng, Shun-Yao
;
Yang, Chyan
;
交大名義發表
;
經營管理研究所
;
National Chiao Tung University
Purchasing risky investments can be a means to maximize individual wealth; but when faced with uncertainty about the investment outcome, individuals search for information on risk-reducing strategies. Most studies focus on digital information and advice-seeking information. This study extends the investigation of information search to discuss heuristics reliance, a simplified information search method. We also examine the effect of risk aversion on our extended information search model. The findings show that, individuals with more risk aversion tend to seek more information. More advice-seeking information search and heuristics reliance through a mass of digital information can increase investor's interest in mutual fund investments. The results demonstrate the value of enhancing the sophistication and accuracy of the information that a counselor provides, especially for investors who are risk averse. This study also has an implication for ethical issues.
Optimal promotional time for maximum sales response with an initial market share in internet marketing
(2011-06-18)
Lin, Chiun-Sin
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Chiang, Chi
;
Chin, Shun-Peng
;
管理科學系
;
Department of Management Science
Most products usually have an initial market share at the beginning in marketing. In order to increase and maximize sales response, sellers can set an optimal promotional time limit. This paper aims to explain how an existing initial market share with vital parameters affects the range and shape of sales response curve to reach optimal promotional time. We use two opposite negative exponential growth functions to build a mathematical model, apply decision calculus to determine parameters, and optimize promotional time limits for maximum sales response. We demonstrate real numerical examples of e-mail marketing by using functions with or without an initial response. Furthermore, we also conduct sensitivity analyses to compare different optimal time limits by various response rates. This paper contributes to the field by providing a sales response model with an initial market share and can be applied to the general one force or two forces cases with vital capacity parameter and exponential growth coefficient to get more elastic, adequate, and complete results.
揮別《海角》　永續恆春觀光
(2011-06-19)
鄭家宜
;
Department of Communication and Technology
;
傳播與科技學系
被視為台灣電影奇蹟的《海角七號》為恆春帶來了前所未有的觀光效益。但是在電影播出三年後的今天，《海角七號》為恆春帶來行銷地方的效果依然存在嗎？
原式金曲　唱遊原式文化
(2011-06-19)
陳文玲
;
Department of Communication and Technology
;
傳播與科技學系
今年第二十二屆金曲獎，最佳樂團由原住民樂團Matzka拿下。近年來，越來越多原住民在各大音樂比賽拿下獎座，社會上對於原住民的好歌喉也表示肯定，但是，原住民音樂絕不只有高亢有力的嗓音，隱藏在音符下的族群意識，才是有別於一般通俗音樂的特點。