Browsing by Issue Date, starting with "2015-11-30"

Now showing 1 - 20 of 20348

InN-based heterojunction photodetector with extended infrared response
(2015-11-30)
Hsu, Lung-Hsing
;
Kuo, Chien-Ting
;
Huang, Jhih-Kai
;
Hsu, Shun-Chieh
;
Lee, Hsin-Ying
The combination of ZnO, InN, and GaN epitaxial layers is explored to provide long wavelength photodetection capability in the GaN based materials. Growth temperature optimization was performed to obtain the best quality of InN epitaxial layer in the MOCVD system. The temperature dependent photoluminescence (PL) can provide the information about thermal quenching in the InN PL transitions and at least two non-radiative processes can be observed. X-ray diffraction and energy dispersive spectroscopy are applied to confirm the inclusion of indium and the formation of InN layer. The band alignment of such system shows a typical double heterojunction, which is preferred in optoelectronic device operation. The photodetector manufactured by this ZnO/GaN/InN layer can exhibit extended long-wavelength quantum efficiency, as high as 3.55%, and very strong photocurrent response under solar simulator illumination. (C) 2015 Optical Society of America
Enhanced power conversion efficiency in InGaN-based solar cells via graded composition multiple quantum wells
(2015-11-30)
Tsai, Yu-Lin
;
Wang, Sheng-Wen
;
Huang, Jhih-Kai
;
Hsu, Lung-Hsing
;
Chiu, Ching-Hsueh
This work demonstrates the enhanced power conversion efficiency (PCE) in InGaN/GaN multiple quantum well (MQWs) solar cells with gradually decreasing indium composition in quantum wells (GQWs) toward p-GaN as absorber. The GQW can improve the fill factor from 42% to 62% and enhance the short current density from 0.8 mA/cm(2) to 0.92 mA/cm(2), as compares to the typical MQW solar cells. As a result, the PCE is boosted from 0.63% to 1.11% under AM1.5G illumination. Based on simulation and experimental results, the enhanced PCE can be attributed to the improved carrier collection in GQW caused by the reduction of potential barriers and piezoelectric polarization induced fields near the p-GaN layer. The presented concept paves a way toward highly efficient InGaN-based solar cells and other GaN-related MQW devices. (C) 2015 Optical Society of America
Developing a microspectrophotometer to measure the dependence of broadband refractive indices on Ge-doped concentrations in GRIN rods
(2015-11-30)
Weng, Chun-Jen
;
Hsu, Ken-Yuh
;
Lee, Cheng-Yeh
;
Chen, Yung-Fu
;
電子物理學系
A confocal microspectrophotometer is utilized to scan the surface reflectivities of a polished gradient-index (GRIN) rod in the range of 400 to 900 nm. The pure fused silica is used to be a reference standard for deducing the absolute reflectivities of the Ge-doped core. Then, multi-wavelength refractive index profiles of the Ge-doped core can be further determined based on the Fresnel equation. Moreover, this work shows a connection between the material dispersion of the GRIN rod and the Gedoped concentrations measured by an energy dispersive spectrometer. Finally, the dependence of the refractive index of the Ge-doped core on the doping concentrations at a certain wavelength can be easily expressed as a linear form. (c) 2015 Optical Society of America
High-peak-power optically-pumped AlGaInAs eye-safe laser with a silicon wafer as an output coupler: comparison between the stack cavity and the separate cavity
(2015-11-30)
Wen, C. P.
;
Tuan, P. H.
;
Liang, H. C.
;
Tsou, C. H.
;
Su, K. W.
An intrinsic silicon wafer is exploited as an output coupler to develop a high-peak-power optically-pumped AlGaInAs laser at 1.52 mu m. The gain chip is sandwiched with the diamond heat spreader and the silicon wafer to a stack cavity. It is experimentally confirmed that not only the output stability but also the conversion efficiency are considerably enhanced in comparison with the separate cavity in which the silicon wafer is separated from other components. The average output power obtained with the stack cavity was 2.02 W under 11.5 W average pump power, corresponding to an overall optical-to-optical efficiency of 17.5%; the slope efficiency was 18.6%. The laser operated at 100 kHz repetition rate and the pulse peak power was 0.4 kW. (c) 2015 Optical Society of America
Improvements in the reliability of a-InGaZnO thin-film transistors with triple stacked gate insulator in flexible electronics applications
(2015-11-30)
Chen, Hua-Mao
;
Chang, Ting-Chang
;
Tai, Ya-Hsiang
;
Chen, Kuan-Fu
;
Chiang, Hsiao-Cheng
This study examined the impact of the low-temperature stacking gate insulator on the gate bias instability of a-InGaZnO thin film transistors in flexible electronics applications. Although the quality of SiNx at low process/deposition temperature is better than that of SiOx at similarly low process/deposition temperature, there is still a very large positive threshold voltage (V-th) shift of 9.4 V for devices with a single low-temperature SiNx gate insulator under positive gate bias stress. However, a suitable oxide-nitride-oxide-stacked gate insulator exhibits a Vth shift of only 0.23 V. This improvement results from the larger band offset and suitable gate insulator thickness that can effectively suppress carrier trapping behavior. (C) 2015 Elsevier B.V. All rights reserved.
Examining Hedonic and Utilitarian Bidding Motivations in Online Auctions: Impacts of Time Pressure and Competition
(2015-12-01)
Chang, Chia-Chi
;
Chen, Chi-Wen
;
交大名義發表
;
National Chiao Tung University
Hedonic and utilitarian bidding motivations have seldom been studied in the context of consumer-to-consumer (C2C) online auctions. Drawing on the stimulus-organism-response (S-O-R) framework, this study establishes a structural equation model to examine how competition and time pressure (stimulus) influence bidders\' hedonic and utilitarian motivations (organism) and how these motivations further affect impulse bidding and satisfaction with the bidding process (responses). Our results show that time pressure is a significant predictor of utilitarian motivation but is not significantly related to hedonic motivation. Moreover, hedonic motivation tends to increase impulse bidding, whereas utilitarian motivation discourages it. Finally, this study finds the relationship between impulse bidding and satisfaction to be significant. Our findings contribute to theory by describing the roles that bidders\' hedonic and utilitarian motivations play in C2C online auctions and elucidating the important implications for practice in attracting individuals to bid in such auctions.
Visible-light communication multiple-input multiple-output technology for indoor lighting, communication, and positioning
(2015-12-01)
Liu, Yang
;
Hsu, Chin-Wei
;
Chen, Hung-Yu
;
Liang, Kevin
;
Chow, Chi-Wai
Visible-light communication (VLC) is license free and electromagnetic-interference free; it thus can be deployed in radio-frequency forbidden areas. The light-emitting diode (LED) system providing simultaneously lighting, VLC, and positioning is highly desirable for providing real-time tracking, monitoring, and navigating with very little extra cost. We propose and demonstrate a multiple-input multiple-output (MIMO) VLC-positioning system using white-light LEDs. Our scheme is based on MIMO to provide both position and VLC. Experimental results show that the proposed MIMO VLC system can achieve a bit-error rate of 10(-10), while the positioning errors are within 1 cm. Numerical analyses are also performed, showing the positioning error can be measured within 1 cm. Further analysis of tilting angle of the receiver is also presented. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Optimizing an on-chip boost DC-DC converter with an on-chip or on-board inductor
(2015-12-01)
Chao, Paul C. -P.
;
Cheng, Chun-Kai
;
Kuan, Ching-Huan
;
電機工程學系
;
Department of Electrical and Computer Engineering
This study is dedicated to develop an on-chip DC-DC boost converter with on-chip or on-board inductors to provide steady high voltage biases from 2.8 to 5 V to drive the gate drivers for advanced liquid crystal displays. Note that the off-chip inductor as compared to the on-chip one inevitably occupies substantial board area and leads to negative effects of electro-magnetic interference (EMI). This study also intends to find optimal design of the on-chip or on-board inductors for an on-chip DC-DC converter in order to provide required large instantaneous currents, while minimizing negative impacts from the off-chip inductance. Parametric studies are conducted to successfully find optimal designs, including optimal switching frequency and duty. The optimization process is further standardized for future commercialization. The optimized DC-DC converters are taped out via the TSMC 0.35 mu m CMOS process technology to validate the proposed design. Experiments are carried out for validating the performance of tape-out chips. The results clearly show the effectiveness of the designs and consistency to expectations.
交大資訊人
(2015-12)
College of Computer Science
;
資訊學院
[前言：迎接工業4.0] P.1 [產學合作] P.2 穿戴式設備用的新契機產業用物聯網技術：邁向工業4.0時代之核心競爭力 [人物專訪] P.9 曾新穆老師：專注在你著迷的議題，不斷地往下探索 [資訊系友] P.13 資策會副執行長何寶中：物聯網技術及應用發展趨勢康聚執行長黃種智：我與交大、交大與我 [活動花絮] P.19 曾煜棋院長：一滴油和砍柴人我的研究法則交換生經驗讓你看見更大的世界 [院系消息] P.24 [獲獎捷報] P.26 [海外實習生/交換生募款計畫]P.28 發行人 / 曾煜棋院長；顧問 / 莊榮宏副院長；總編輯 / 林珮雯；企畫 / 楊欣宜；攝影 / 蔡佩綺陳煒文
Resolving Partial-Viewpoint Paradoxes of Innovation Strategies: Toward an Integrative Framework
(交通大學, 2015-12-01)
洪新民
;
Hsin-Min Hung
本文系統化分析1996 至2012 年間社會科學引用指標 (SSCI) 及谷歌學術 (Google Scholar) 資料庫文獻，從知識管理觀點提出一個創新與效率、環境確定與不確定及時間軸的三維架構，整合創新的創造、選擇與擴散相關文獻，從三維空間中看到解決創新策略矛盾的觀點。本研究貢獻包含：(1)解決因為不同研究者聚焦在不同特定二維平面所造成的矛盾，例如產業創新理論中供給面與需求面策略的矛盾，供給面策略主張產品發展早期追求產品創新效能而晚期追求成本效率 (Abernathy and Utterback, 1978)；需求面策略則是主張產品發展早期追求降低成本至顧客願意支付的價格，而晚期追求強化效能以穩定提升價格 (Adner and Levinthal, 2001)；(2) 提出實務中常用的創新產品性 (能) 價 (格) 比作為競爭策略指標並提供理論上合理的解釋；(3) 提供學習創新與技術管理的架構，促進知識發展，此動態三維整合架構可提供後續研究用來解決目前創新研究的相關矛盾。
時光如此遙遠的中國
(國立陽明交通大學出版社, 2015-12-01)
張錦忠
Resource-constrained scheduling with optional recycling operations
(2015-12-01)
Lin, Bertrand M. T.
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資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
This paper introduces a scheduling problem with a variant of resource constraint that stems from a relocation project. We also propose the concept of optional recycling operations, in which recycling operations are separated from the processing of jobs and recycling operations are exercised only when necessary. An integer program is proposed to formulate the problem and facilitate complexity classification. We propose a pseudo-polynomial time dynamic program, and then classify the complexity status of several restricted cases. (C) 2015 Elsevier Ltd. All rights reserved.
動物敘事與中國崛起：姜戎《狼圖騰》和楊志軍《藏獒》裡的政治
(國立陽明交通大學出版社, 2015-12-01)
洪士惠
Aromatic residues in RNase T stack with nucleobases to guide the sequence-specific recognition and cleavage of nucleic acids
(2015-12-01)
Duh, Yulander
;
Hsiao, Yu-Yuan
;
Li, Chia-Lung
;
Huang, Jason C.
;
Yuan, Hanna S.
RNase T is a classical member of the DEDDh family of exonucleases with a unique sequence preference in that its 3\'-to-5\' exonuclease activity is blocked by a 3\'-terminal dinucleotide CC in digesting both single-stranded RNA and DNA. Our previous crystal structure analysis of RNase T-DNA complexes show that four phenylalanine residues, F29, F77, F124, and F146, stack with the two 3\'-terminal nucleobases. To elucidate if the pi-pi stacking interactions between aromatic residues and nucleobases play a critical role in sequence-specific protein-nucleic acid recognition, here we mutated two to four of the phenylalanine residues in RNase T to tryptophan (W mutants) and tyrosine (Y mutants). The Escherichia coli strains expressing either the W mutants or the Y mutants had slow growth phenotypes, suggesting that all of these mutants could not fully substitute the function of the wild-type RNase T in vivo. DNA digestion assays revealed W mutants shared similar sequence specificity with wild-type RNase T. However, the Y mutants exhibited altered sequence-dependent activity, digesting ssDNA with both 3\'-end CC and GG sequences. Moreover, the W and Y mutants had reduced DNA-binding activity and lower thermal stability as compared to wild-type RNase T. Taken together, our results suggest that the four phenylalanine residues in RNase T not only play critical roles in sequence-specific recognition, but also in overall protein stability. Our results provide the first evidence showing that the pi-pi stacking interactions between nucleobases and protein aromatic residues may guide the sequence-specific activity for DNA and RNA enzymes.
導言：距離如此接近
(國立陽明交通大學出版社, 2015-12-01)
王智明
Interfacial electronic structure of Na deposited on rubrene thin film studied by synchrotron radiation photoemission
(2015-12-01)
Wei, Ching-Hsuan
;
Cheng, Chiu-Ping
;
Lin, Hong-Cheu
;
Pi, Tun-Wen
;
材料科學與工程學系
The electronic structure of rubrene doped with various concentrations of Na was studied by synchrotronradiation photoemission. Three stages of development were found with increasing Na concentration; Na penetrating deep into the organic film, followed by development of gap states, and ended with a metallic Na film. The charge transfer from Na to rubrene resulted in a vacuum-level shift. By doping Na into rubrene, we could control the IP of the organic molecule, which is favorable for application in organic semiconductor devices. (C) 2015 Elsevier B.V. All rights reserved.
Multistability for Delayed Neural Networks via Sequential Contracting
(2015-12-01)
Cheng, Chang-Yuan
;
Lin, Kuang-Hui
;
Shih, Chih-Wen
;
Tseng, Jui-Pin
;
應用數學系
In this paper, we explore a variety of new multistability scenarios in the general delayed neural network system. Geometric structure embedded in equations is exploited and incorporated into the analysis to elucidate the underlying dynamics. Criteria derived from different geometric configurations lead to disparate numbers of equilibria. A new approach named sequential contracting is applied to conclude the global convergence to multiple equilibrium points of the system. The formulation accommodates both smooth sigmoidal and piecewise-linear activation functions. Several numerical examples illustrate the present analytic theory.
High-Image Reproduction by the Low-Field-Rate Stencil-LPD Method for Field-Sequential-Color LCDs
(2015-12-01)
Lin, Fang-Cheng
;
Chang, Chi-Wen
;
Huang, Yi-Pai
;
Shieh, Han-Ping D.
;
光電工程學系
Color breakup is a lethal issue to conventional field-sequential-color LCDs. Several methods have been proposed to solve this problem. However, these solutions are either more than 180 Hz-the currently used LC mode is not sufficiently fast for this field rate-or they degrade the image quality while using a field rate of 120 Hz. To overcome these limitations, a 120 Hz Stencil Local Primary Desaturation, Stencil-LPD, is presented in this work. The 120 Hz Stencil-LPD method provides reduced but sufficient saturated backlight color to precisely present an image with less color distortion or color breakup. After optimizing a number of backlight segments, the experimental results demonstrate that the image fidelity is significantly improved and color breakup is greatly suppressed compared to the existing methods.
讀書－《文學與革命》在中國：編案
(深河出版有限公司, 2015-12-01)
人間思想編輯部
淺談排球短發策略與技巧
(國立交通大學體育室, 2015-12-01)
廖琬如
;
李建毅
;
曾華鈺
;
陳玫伶
;
Wan-Ju Liao
發球是排球運動六大基本技術之一，屬於閉鎖性的動作，也是積極、主動的技術，不受其他技術、隊友彼此間的干擾，也不受對隊選手的影響，是得分的重要技術之一，目的：本文之目的在於了解短發球的功用性，提供教學與訓練者參考。方法：本研究採文獻蒐集法進行研究與資料發析。結果：結果使用高弧度發球能應用在對方中間手站在2、4 號位時有效牽制，相對於平飛球球速較快，較有機會逮到對方的空檔，特別在於對方接發球站位比較深遠的球隊，而中庸深度的發球則有機會造成1、5 號位主接球員搶接以致造成接發破壞。結論：事實上，在比賽過程中，球隊進入拉鋸戰時，教練可能都考慮過使用短發球策略，因此，在重要時刻教練都必須做出決策，使球隊拉到領先地位，如果短發球的使用在前面四局都有成效，那麼不必要害怕使用這策略，相同的它在第五局應該還是有效的發球策略。