Browsing by Issue Date, starting with "2014-10-20"

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交大e-News第173期
(2014-10-20)
Secretariat
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國立交通大學秘書室
Coding for stable transmission of W-band radio-over-fiber system using direct-beating of two independent lasers
(2014-10-20)
Yang, L. G.
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Sung, J. Y.
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Chow, C. W.
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Yeh, C. H.
;
Cheng, K. T.
We demonstrate experimentally Manchester (MC) coding based W-band (75 - 110 GHz) radio-over-fiber (ROF) system to reduce the low-frequency-components (LFCs) signal distortion generated by two independent low-cost lasers using spectral shaping. Hence, a low-cost and higher performance W-band ROF system is achieved. In this system, direct-beating of two independent low-cost CW lasers without frequency tracking circuit (FTC) is used to generate the millimeter-wave. Approaches, such as delayed self-heterodyne interferometer and heterodyne beating are performed to characterize the optical-beating-interference sub-terahertz signal (OBIS). Furthermore, W-band ROF systems using MC coding and NRZ-OOK are compared and discussed. (C) 2014 Optical Society of America
Nd:YLF laser at cryogenic temperature with orthogonally polarized simultaneous emission at 1047 nm and 1053 nm
(2014-10-20)
Cho, C. Y.
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Huang, T. L.
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Wen, S. M.
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Huang, Y. J.
;
Huang, K. F.
A Nd:YLF laser at cryogenic temperature is demonstrated for the first time with orthogonally polarized simultaneous emission at 1047 nm and 1053 nm. By exploring the temperature dependence of the fluorescence and the absorption spectra from the Nd: YLF crystal, the feasibility of simultaneous emission at low temperature is achieved. Due to the local heating from the pump absorption, the optimal temperature with respect to the pump power for balancing output powers of simultaneous emission is thoroughly explored. At the optimal temperature of 138 K, the total output power of the simultaneous emission can reach 3.1 W at an incident pump power of 7.9 W, corresponding to the optical to optical slope efficiency up to 43%. (C) 2014 Optical Society of America
Electronic Structure of Open-Shell Tetrahedral {Fe(NO)(2)}(9) Dinitrosyliron Complexes
(2014-10-20)
Liu, Kuan-Yu
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Yu, Jen-Shiang K.
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生物科技學系
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生物資訊及系統生物研究所
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Department of Biological Science and Technology
High-level ab initio excited-state theory is employed to investigate the electronic structure of doublet {Fe(NO)(2)}(9) species in the ground state and compared with the results obtained by density functional theory. Both of the approaches consistently suggest that the linear NO ligands in dinitrosyliron complexes (DNICs) feature a radical character. Theoretical calculations also predict that the cyanide-supported DNIC anion of [(NC)(2)Fe(NO)(2)](-) features C-2 nu symmetry with a Fe-C-N bonding motif, and multireference theories suggest a minimal active space of CAS(9,9) to describe these {Fe(NO)(2)}(9) compounds, while larger CAS(13,13) calculations do not tend to significantly improve the geometries. Experimental vibration modes of NO ligands are also accurately assigned due to second-order n-electron valence state perturbation theory.
Monolithic integration of GaN-based light-emitting diodes and metal-oxide-semiconductor field-effect transistors
(2014-10-20)
Lee, Ya-Ju
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Yang, Zu-Po
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Chen, Pin-Guang
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Hsieh, Yung-An
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Yao, Yung-Chi
In this study, we report a novel monolithically integrated GaN-based light-emitting diode (LED) with metal-oxide-semiconductor field-effect transistor (MOSFET). Without additionally introducing complicated epitaxial structures for transistors, the MOSFET is directly fabricated on the exposed n-type GaN layer of the LED after dry etching, and serially connected to the LED through standard semiconductor-manufacturing technologies. Such monolithically integrated LED/MOSFET device is able to circumvent undesirable issues that might be faced by other kinds of integration schemes by growing a transistor on an LED or vice versa. For the performances of resulting device, our monolithically integrated LED/MOSFET device exhibits good characteristics in the modulation of gate voltage and good capability of driving injected current, which are essential for the important applications such as smart lighting, interconnection, and optical communication. (C) 2014 Optical Society of America
全像儲存系統及其影像識別方法
(2014-10-21)
歐陽盟
;
陳昱達
Extraction of infrared optical constants from fringing reflectance spectra
(2014-10-21)
Chung, Pei-Kang
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Yen, Shun-Tung
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
We propose a simple and reliable method for extracting the optical constants of homogeneous dielectrics which can be pure or impure, and polar or nonpolar. The extraction is made from fringing reflectance spectra of slab samples with and without metal on the backside. The method is demonstrated to work well for polar semiconductors GaAs and InP in the infrared regime. The extracted extinction coefficient spectra exhibit plenty of features which correspond well to those in absorption and Raman spectra. (C) 2014 AIP Publishing LLC.
Enhanced optical property in quaternary GaInAsSb/AlGaAsSb quantum wells
(2014-10-21)
Lin, Chien-Hung
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Lee, Chien-Ping
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
High quality GaInAsSb/AlGaAsSb quantum wells (QWs) have been grown by molecular beam epitaxy using proper interface treatments. By controlling the group-V elements at interfaces, we obtained excellent optical quality QWs, which were free from undesired localized trap states, which may otherwise severely affect the exciton recombination. Strong and highly efficient exciton emissions up to room temperature with a wavelength of 2.2 mu m were observed. A comprehensive investigation on the QW quality was carried out using temperature dependent and power dependent photoluminescence (PL) measurements. The PL emission intensity remains nearly constant at low temperatures and is free from the PL quenching from the defect induced localized states. The temperature dependent emission energy had a bulk-like behavior, indicating high quality well/barrier interfaces. Because of the uniformity of the QWs and smooth interfaces, the low temperature limit of inhomogeneous line width broadening is as small as 5meV. (C) 2014 AIP Publishing LLC.
具有高電子遷移率之氮化鎵電晶體結構
(2014-10-21)
張翼
;
張嘉華
;
林岳欽
;
陳宥綱
;
劉世謙
一種具有高電子遷移率之氮化鎵電晶體結構，包括一基板、一位於基板上之氮化鎵磊晶層、至少一位於氮化鎵磊晶層上之歐姆接觸層、一位於氮化鎵磊晶層之上的金屬閘極層、以及一位於金屬閘極層與氮化鎵磊晶層之間的擴散阻擋層。利用此一擴散阻擋層，可用以阻擋金屬閘極層之擴散，使得氮化鎵電晶體結構具有較佳之元件特性及可靠度。
提高光偵測度之光偵測元件及其形成方法
(2014-10-21)
陳方中
;
林書丞
一種光偵測元件之形成方法，包括：提供基板；在基板上形成透明導電薄膜；在透明導電薄膜上形成導電高分子層；在導電高分子層上形成有機主動層；在有機主動層上形成電荷阻擋層；以及在電荷阻擋層上形成陰極金屬。
一維金屬奈米結構之製造方法
(2014-10-21)
陳昱良
;
錢乃瑛
;
裘性天
;
李紫原
本發明提供一種一維金屬奈米結構之製造方法，係利用濺鍍方式濺鍍一層導電薄膜於一撓性基材上，以形成一導電基材；再將導電基材放置於電鍍溶液內進行電化學沈積，使導電基材上形成對應導電薄膜之一維金屬奈米線結構。因此，本發明的材料製作不需要複雜的微影蝕刻技術流程、及金屬奈米結構粉末混漿塗膜於基材上，即可得到具有高表面積的一維金屬奈米線線結構於撓性基材上。
Reaction dynamics of O(D-1) + HCOOD/DCOOH investigated with time-resolved Fourier-transform infrared emission spectroscopy
(2014-10-21)
Huang, Shang-Chen
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Nghia, N. T.
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Putikam, Raghunath
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Nguyen, Hue M. T.
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Lin, M. C.
We investigated the reaction dynamics of O(D-1) towards hydrogen atoms of two types in HCOOH. The reaction was initiated on irradiation of a flowing mixture of O-3 and HCOOD or DCOOH at 248 nm. The relative vibration-rotational populations of OH and OD (1 <= upsilon <= 4, J <= 15) states were determined from time-resolved IR emission recorded with a step-scan Fourier-transform spectrometer. In the reaction of O(D-1) + HCOOD, the rotational distribution of product OH is nearly Boltzmann, whereas that of OD is bimodal. The product ratio [OH]/[OD] is 0.16 +/- 0.05. In the reaction of O(D-1) + DCOOH, the rotational distribution of product OH is bimodal, but the observed OD lines are too weak to provide reliable intensities. The three observed OH/OD channels agree with three major channels of production predicted with quantum-chemical calculations. In the case of O(D-1) + HCOOD, two intermediates HOC(O)OD and HC(O)OOD are produced in the initial C-H and O-D insertion, respectively. The former undergoes further decomposition of the newly formed OH or the original OD, whereas the latter produces OD via direct decomposition. Decomposition of HOC(O)OD produced OH and OD with similar vibrational excitation, indicating efficient intramolecular vibrational relaxation, IVR. Decomposition of HC(O)OOD produced OD with greater rotational excitation. The predicted [OH]/[OD] ratio is 0.20 for O(D-1) + HCOOD and 4.08 for O(D-1) + DCOOH; the former agrees satisfactorily with experiments. We also observed the upsilon(3) emission from the product CO2. This emission band is deconvoluted into two components corresponding to internal energies E = 317 and 96 kJ mol(-1) of CO2, predicted to be produced via direct dehydration of HOC(O)OH and secondary decomposition of HC(O)O that was produced via decomposition of HC(O)OOH, respectively. (C) 2014 AIP Publishing LLC.
角度偵測方法及其裝置
(2014-10-21)
鍾世忠
;
鄭人豪
Method for key generation, member authentication, and communication security in dynamic group
(2014-10-21)
Tseng Chien-Chao
;
Ho Tzu-Hsin
The present invention provides a method for keys generation, member authentication and communication security in a dynamic group, which comprises steps: assigning each member an identification vector containing common group identification vector elements and an individual identification vector element, and generating an authentication vector and an access control vector for each member according to the identification vector; using the identification vector elements to generate public key elements and establish an authentication public key and an access control public key; and using a polynomial and the identification vector to generate a private key. The present invention uses these public keys and private keys, which are generated from the identification vectors, to implement serverless member authentication and data access control, whereby is protected privacy of members and promoted security of communication.
含有圓管形培養袋之微藻養殖模組
(2014-10-21)
林志生
;
高千雅
一種微藻養殖模組，其包括支撐結構、至少一圓管形培養袋、培養基以及進氣設備。支撐結構的兩側分別具有多個定位部，圓管形培養袋的兩端分別固定於支撐結構兩側的定位部上。培養基充填於圓管形培養袋內，且其中含有微藻株。進氣設備連通至圓管形培養袋，以將氣體通入圓管形培養袋。其中，圓管形培養袋在配設於支撐結構時，其內部整體連通，且於圓管形培養袋長度方向上的剖面呈弧形。
Influence of an anomalous dimension effect on thermal instability in amorphous-InGaZnO thin-film transistors
(2014-10-21)
Liu, Kuan-Hsien
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Chang, Ting-Chang
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Chou, Wu-Ching
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Chen, Hua-Mao
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Tsai, Ming-Yen
This paper investigates abnormal dimension-dependent thermal instability in amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors. Device dimension should theoretically have no effects on threshold voltage, except for in short channel devices. Unlike short channel draininduced source barrier lowering effect, threshold voltage increases with increasing drain voltage. Furthermore, for devices with either a relatively large channel width or a short channel length, the output drain current decreases instead of saturating with an increase in drain voltage. Moreover, the wider the channel and the shorter the channel length, the larger the threshold voltage and output on-state current degradation that is observed. Because of the surrounding oxide and other thermal insulating material and the low thermal conductivity of the IGZO layer, the self-heating effect will be pronounced in wider/shorter channel length devices and those with a larger operating drain bias. To further clarify the physical mechanism, fast ID-VG and modulated peak/base pulse time ID-VD measurements are utilized to demonstrate the self-heating induced anomalous dimension-dependent threshold voltage variation and on-state current degradation. (C) 2014 AIP Publishing LLC.
有機太陽能元件及其製作方法
(2014-10-21)
陳方中
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李佳霖
;
吳志力
Hyperhomocysteinemia in Patients with Polypoidal Choroidal Vasculopathy: A Case Control Study
(2014-10-22)
Cheng, Hui-Chen
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Liu, Jorn-Hon
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Lee, Shui-Mei
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Lin, Po-Kang
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生醫電子轉譯研究中心
Purpose: To determine whether elevated plasma homocysteine and serum high sensitivity C-reactive protein (hsCRP) levels, two established risk factors of vascular diseases, are associated with polypoidal choroidal vasculopathy (PCV). Design: Retrospective case-control study. Methods: One hundred and nineteen consecutive patients with PCV and 119 matched controls were enrolled in a tertiary hospital from September 2008 to June 2013. Plasma homocysteine and serum hsCRP levels were measured. Associations among plasma homocysteine, serum hsCRP levels and PCV were further evaluated using multivariable logistic regression analysis. Results: The median plasma homocysteine level was significantly higher in patients with PCV than in the controls (12.20 mu mol/L vs. 9.80 mu mol/ L, p<0.001). The median serum hsCRP level was slightly higher in the PCV group (0.16 mg/dl vs. 0.11 mg/dl in control group, p = 0.07). After multivariable logistic regression analysis, each 1 mmol/ L increase of plasma homocysteine was associated with a 1.5-fold increase in likelihood of having PCV (OR, 1.54; 95% confidence interval (CI), 1.33-1.79, p<0.001). Conclusions: Hyperhomocysteinemia was associated with PCV and might play a role in the pathogenesis of PCV.
Enhanced Electrocatalytic Activity of MoSx on TCNQ-Treated Electrode for Hydrogen Evolution Reaction
(2014-10-22)
Chang, Yung-Huang
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Nikam, Revannath D.
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Lin, Cheng-Te
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Huang, Jing-Kai
;
Tseng, Chien-Chih
Molybdenum sulfide has recently attracted much attention because of its low cost and excellent catalytical effects in the application of hydrogen evolution reaction (HER). To improve the HER efficiency, many researchers have extensively explored various avenues such as material modification, forming hybrid structures or modifying geometric morphology. In this work, we reported a significant enhancement in the electrocatalytic activity of the MoSx via growing on Tetracyanoquinodimethane (TCNQ) treated carbon cloth, where the MoSx was synthesized by thermolysis from the ammonium tetrathiomolybdate ((NH4)(2)MoS4) precursor at 170 degrees C. The pyridinic N- and graphitic N-like species on the surface of carbon cloth arising from the TCNQ treatment facilitate the formation of Mo5+ and S-2(2-) species in the MoSx, especially with S-2(2-) serving as an active site for HER. In addition, the smaller particle size of the MoSx grown on TCNQ-treated carbon cloth reveals a high ratio of edge sites relative to basal plane sites, indicating the richer effective reaction sites and superior electrocatalytic characteristics. Hence, we reported a high hydrogen evolution rate for MoSx on TCNQ-treated carbon cloth of 6408 mL g(-1) cm(-2) h(-1) (286 mmol g(-1) cm(-2) h(-1)) at an overpotential of V = 0.2 V. This study provides the fundamental concepts useful in the design and preparation of transition metal dichalcogenide catalysts, beneficial in the development in clean energy
YB-1 disrupts mismatch repair complex formation, interferes with MutS alpha recruitment on mismatch and inhibits mismatch repair through interacting with PCNA
(2014-10-23)
Chang, Y-W
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Mai, R-T
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Fang, W-H
;
Lin, C-C
;
Chiu, C-C
Y-box binding protein-1 (YB-1) is highly expressed in tumors and it participates in various cellular processes. Previous studies indicated that YB-1 binds to mispaired DNA and interacts with several mismatch repair (MMR)-related factors. However, its role in the MMR system remains undefined. Here, we found that YB-1 represses mutS homolog 6 (MSH6)-containing MMR complex formation and reduces MutS alpha mismatch binding activity by disrupting interactions among MMR-related factors. In an effort to elucidate how YB-1 exerts this inhibitory effect, we have identified two functional proliferating cell nuclear antigen (PCNA)interacting protein (PIP)-boxes that mediate YB-1/PCNA interaction and locate within the C-terminal region of YB-1. This interaction is critical for the regulatory role of YB-1 in repressing MutSa mismatch binding activity, disrupting MutS alpha/PCNA/G/T heteroduplex ternary complex formation and inhibiting in vitro MMR activity. The differential regulation of 3\' and 5\' nick-directed MMR activity by YB-1 was also observed. Moreover, YB-1 overexpression is associated with the alteration of microsatellite pattern and the enhancement of N-methyl-N\'-nitro-N-nitrosoguanidine (MNNG)-induced and spontaneous mutations. Furthermore, upregulation of other PIP-box-containing proteins, such as myeloid cell leukemia-1 (Mcl-1) and inhibitor of growth protein 1b (ING1b), has no impact on MMR complex formation and mutation accumulation, thus revealing the significant effect of YB-1 on regulating the MMR system. In conclusion, our study suggests that YB-1 functions as a PCNA-interacting factor to exert its regulatory role on the MMR process and involves in the induction of genome instability, which may partially account for the oncogenic potential of YB-1.