Browsing by Issue Date, starting with "2014-10-01"

Now showing 1 - 20 of 25468

Methodological considerations in combined noninvasive ventilation and mechanical inexsufflator
(2014-10-01)
Hsu, Jong-Hau
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Chen, Tai-Heng
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Jong, Yuh-Jyh
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交大名義發表
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生物科技學系
非揮發性半導體記憶體裝置
(2014-10-01)
林鴻志
;
林哲民
A PVT-Independent Constant-G(m) Bias Technique Based on Analog Computation
(2014-10-01)
Chu, Ching-Yun
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Wang, Yu-Jiu
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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
This brief presents a new process, voltage, and temperature (PVT)-independent constant-G(m) bias technique for any I-out(V-in)-monotonic convex (or concave) transconductors. In this brief, the conventional constant-g(m) biasing is formulated into an analog computation process that calculates the constant-G(m) bias voltage V-0 from an input current. An analog computer measures the effective G(m) from two matched transconductors and converges it to the inverse of a precision resistance by adjusting V-0. Through this, a well-defined large-signal constant-G(m) bias voltage can be found. The proposed technique eliminates the power-law or exponential-law assumptions on the I-out(V-in) characteristics in a conventional design. An interpolation calculation follows to find the optimal small-signal constant-g(m) bias voltage V-out. The fundamental limitations of the proposed technique are the required monotonicity and convexity (or concavity) of the transconductor\'s I-out(V-in). Error sources include mismatches of paired devices and the input offset voltage and open-loop gain of the operation amplifier (OpAmp). These errors are analyzed in detail in this brief. Biasing circuits based on different transistor types are designed using the Taiwan Semiconductor Manufacturing Company (TSMC) 65-nm CMOS process. Computer simulations show that the proposed biasing circuitry can achieve +/- 0.22% g(m) variations from -60 degrees C to 130 degrees C.
Corrugated Surfaces With Tailorable Dark Sectors Within Prescribed Frequency Bands
(2014-10-01)
Kehn, Malcolm Ng Mou
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交大名義發表
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National Chiao Tung University
Electromagnetic bandgap (EBG) surfaces have customarily been defined as being prohibitive of surface-waves within frequency ranges called bandgaps, for all directions along the surface, this latter specification being an understood presumed condition. However, not all practical applications require such an entire bandgap in terms of surface directions. Rather, there could be situations where surface-wave suppression is needed along directions only within an angular sector but are instead desirable towards others outside, over a frequency band, termed herein as a sectoral dark band (SDB). This work investigates this aspect using planar corrugated surfaces as the vehicle for study, in virtue of its ease of surface-wave modal analysis of dispersion by asymptotic corrugations boundary conditions (ACBC). A systematic design procedure for tailoring surfaces to any specified dark sector of weak signals prevailing over any prescribed band is presented.
A highly selective turn-on fluorescence chemosensor for Hg(II) and its application in living cell imaging
(2014-10-01)
Yu, Shiang-Yi
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
A new coumarin derivative (MS1) containing an imine moiety and a hydroxyl moiety exhibits an enhanced fluorescence in the presence of Hg2+ ions. Other metal ions Al3+, Ca2+, Co2+, Cr3+, Cu2+, Fe2+, Fe3+, Hg-2+,Hg- Mg2+, Mn2+, Ni2+, Pb2+, and Zn2+ produced only minor changes in the fluorescence values of MS1. The binding ratio of MS1-Hg2+ complexes was determined from the Job plot to be 1:1. The binding constant (Ka) of Hg2+ binding to MS1 was found to be 6.85 x 103 M-1. The maximum fluorescence enhancement caused by Hg2+ binding to MS1 was observed in the pH range of 6.5-9.0. Confocal fluorescence microscopy imaging using RAW 264.7 cells showed that MS1 could be used as an effective fluorescent probe for detecting Hg2+ in living cells. (C) 2014 Elsevier B.V. All rights reserved.
MULTIHOP CELLULAR: FROM RESEARCH TO SYSTEMS, STANDARDS, AND APPLICATIONS
(2014-10-01)
Lin, Ying-Dar
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Hsu, Yu-Ching
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Chattterjee, Mainak
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Kunz, Thomas
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交大名義發表
Deep Packet Inspection: Algorithms, Hardware, and Applications
(2014-10-01)
Lin, Ying-Dar
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Lin, Po-Ching
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Prasanna, Viktor K.
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Chao, H. Jonathan
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Lockwood, John W.
The post-purchase communication strategies for supporting online impulse buying
(2014-10-01)
Chang, Chia-Chi
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Tseng, Ai-Hua
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管理科學系
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Department of Management Science
As online impulse buying and the consequent cognitive dissonance can be a critical determinant of consumer e-satisfaction, effective post-purchase communication (arguments) to reduce post-purchase cognitive dissonance of impulsive buyers hence warrants further exploration. The current research focuses on the determinants of perceived persuasion of the post-purchase arguments and impulsive buyer e-satisfaction. The purpose of this study is to investigate the persuasion of post-purchase arguments on online impulsive buyer satisfaction. A 2 (number of arguments) x 2 (argument strength) experimental design was employed in order to examine whether the persuasion of arguments (e.g. the number and strength of arguments) would vary upon consumers\' tendency to regret. The results indicated that an increased number of arguments provided after the purchase had a stronger positive effect on e-satisfaction when arguments were strong than when arguments were weak. Such an impact would be less pronounced for low tendency-to-regret consumers than for high tendency-to-regret consumers. (C) 2014 Elsevier Ltd. All rights reserved.
Fast approximation algorithms for bi-criteria scheduling with machine assignment costs
(2014-10-01)
Lee, Kangbok
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Leung, Joseph Y-T.
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Jia, Zhao-hong
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Li, Wenhua
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Pinedo, Michael L.
We consider parallel machine scheduling problems where the processing of the jobs on the machines involves two types of objectives. The first type is one of two classical objective functions in scheduling theory: either the total completion time or the makespan. The second type involves an actual cost associated with the processing of a specific job on a given machine: each job-machine combination may have a different cost. Two bi-criteria scheduling problems are considered: (1) minimize the maximum machine cost subject to the total completion time being at its minimum, and (2) minimize the total machine cost subject to the makespan being at its minimum. Since both problems are strongly NP-hard, we propose fast heuristics and establish their worst-case performance bounds. (C) 2014 Elsevier B.V. All rights reserved.
Discussion of "Integral and Closed-Form Analytical Solutions to the Transport Contaminant Equation Considering 3D Advection and Dispersion" by Luan Carlos de S. M. Ozelim and Andre Luis Brasil Cavalcante DOI: 10.1061/(ASCE)GM.1943-5622.0000245
(2014-10-01)
Huang, Ching-Sheng
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Yeh, Hund-Der
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交大名義發表
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環境工程研究所
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National Chiao Tung University
Resolving spectral overlap issue of intermediate band solar cells using non-uniform sub-bandgap state filling
(2014-10-01)
Lin, Albert
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Phillips, Jamie
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交大名義發表
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電子工程學系及電子研究所
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National Chiao Tung University
Intermediate band solar cell provides novel alternative to multi-junction solar cell, but its efficiency is significantly degraded when spectral overlap exists between different absorption bands. Here, a scheme using non-uniform sub-bandgap state filling together with intermediate band transport is proposed to resolve the spectral overlap issue. On the basis of detailed balance calculation, spectrally decoupled devices using low-high state filling is shown to achieve 52.8% conversion efficiency when 4eV spectral overlap is present between absorption coefficients of different bands, compared with baseline efficiency equal to 35.1% for conventional half-filled intermediate band devices. If a base material without intermediate band is added to the two section low-high state filling devices, the efficiency is further increased to 61.5%, which approaches efficiency of 63.2% for intermediate band devices with no spectral overlap and 63.8% for unconstrained triple-junction tandem cells. The junction thermalization loss associated with proposed new structures is shown to be equal to conventional half-filled intermediate band devices. Copyright (c) 2013 John Wiley & Sons, Ltd.
A bionic approach to mathematical modeling the fold geometry of deployable reflector antennas on satellites
(2014-10-01)
Feng, C. M.
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Liu, T. S.
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交大名義發表
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機械工程學系
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National Chiao Tung University
Inspired from biology, this study presents a method for designing the fold geometry of deployable reflectors. Since the space available inside rockets for transporting satellites with reflector antennas is typically cylindrical in shape, and its cross-sectional area is considerably smaller than the reflector antenna after deployment, the cross-sectional area of the folded reflector must be smaller than the available rocket interior space. Membrane reflectors in aerospace are a type of lightweight structure that can be packaged compactly. To design membrane reflectors from the perspective of deployment processes, bionic applications from morphological changes of plants are investigated. Creating biologically inspired reflectors, this paper deals with fold geometry of reflectors, which imitate flower buds. This study uses mathematical formulation to describe geometric profiles of flower buds. Based on the formulation, new designs for deployable membrane reflectors derived from bionics are proposed. Adjusting parameters in the formulation of these designs leads to decreases in reflector area before deployment. (C) 2014 IAA. Published by Elsevier Ltd. All rights reserved.
Pseudo-Ramp Current Balance (PRCB) Technique With Offset Cancellation Control (OCC) in Dual-Phase DC-DC Buck Converter
(2014-10-01)
Su, Yi-Ping
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Chen, Wei-Chung
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Huang, Yu-Ping
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Lee, Yu-Huei
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Chen, Ke-Horng
To cope with monolithic controller replicas and the current unbalance situation in multiphase converters, a pseudoramp current balance technique is proposed to achieve timemultiplexing current balance in voltage-mode multiphase DC-DC buck converter. With only one modulation controller, silicon area and power consumption caused by the replicas of controller can be reduced significantly. Current balance accuracy can be further enhanced since the mismatches between different controllers caused by process, voltage, and temperature variations are removed. Moreover, the offset cancellation control embedded in the current matching unit is used to eliminate intrinsic offset voltage existing at the operational transconductance amplifier for improved current balance. An explicit model, which contains both voltage and current balance loops with non-ideal effects, is derived for analyzing system stability. Experimental results show that current difference between each phase can be decreased by over 83% under both heavy and light load conditions.
Modeling team performance and its determinants in high-tech industries: Future trends of virtual teaming
(2014-10-01)
Joe, Sheng-Wuu
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Tsai, Yuan-Hui
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Lin, Chieh-Peng
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Liu, Wei-Te
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經營管理研究所
Drawing upon social cognitive theory, this research postulates critical team characteristics and environmental factors as key drivers of team performance in virtual contexts. In the proposed model of this study, team performance is positively related to four antecedents (i.e., team efficacy, collective outcome expectation, emotional intelligence climate, and procedural justice climate) directly and indirectly via the mediation of team planning. An empirical testing of this research, by investigating working professionals in high-tech industries, suggests the applicability of social cognitive theory in understanding team performance in virtual teaming contexts. Last, managerial implications about future virtual teaming and limitations of this research are provided. (C) 2014 Elsevier Inc. All rights reserved.
Compact Ga-Doped ZnO Nanorod Thin Film for Making High-Performance Transparent Resistive Switching Memory
(2014-10-01)
Huang, Chun-Yang
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Ho, Yen-Ting
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Hung, Chung-Jung
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Tseng, Tseung-Yuen
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材料科學與工程學系
Fully transparent and stable resistive switching characteristics in resistive random access memory (RRAM) device consisting of ITO/Ga doped ZnO (GZO)/ZnO/ITO architecture are proposed. The GZO nanorods with well aligned and extremely dense properties are considered as a thin film for RRAM device. The oxygen vacancies can be confined and migrate along grain boundaries in the GZO nanorod film. Therefore, the weakest point for formation and rupture of conductive filament can be limited at the interface between GZO nanorod film and ZnO seeding layer. Compared with ITO/ZnO/ITO device, a significant improvement in the distribution of high resistance state (HRS) and low resistance state (LRS) during resistance switching is demonstrated in the present device. In addition, a high endurance of more than 7000 cycles with the resistance ratios of HRS/LRS about 200 times is achieved in this device. The ITO/GZO/ZnO/ITO device is a good candidate for the transparent RRAM application.
Self-Calibrated Knee Voltage Detector With 99.65% High Accuracy for AC Charger System in 0.5 mu m 500 V UHV Process
(2014-10-01)
Chiu, Chao-Chang
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Lin, Moris
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Chang, Chih-Wei
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Meng, Che-Hao
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Yang, Hsiang-An
The self-calibrated knee voltage detector (SC-KVD) for electrical isolation primary side charger applications is proposed. The removal of the feedback network which is used in conventional designs and occupies at least 30 mm(2) can save PCB area up to around 11%. Besides, the SC-KVD can dynamically adjust the detection point to improve the accuracy to 99.65% compared to the prior arts. The test chip fabricated in 0.5 mu m 500 V UHV process can be powered on directly by the AC source owing to the 500 V ultra-high voltage device. Hence, the battery charger can be made more compact and portable than it was and the battery life can be prolonged and guaranteed.
台灣股票市場之機構投資人持股與系統流動性關係
(2014-10-01)
闕河士
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方怡
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Horace Chueh
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Yi Fang
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Institute of Business and Management
系統流動性是指個別股票流動性變化相對於整體市場流動性變化的敏感性。本文以1982至2008年台灣證券交易所資料進行實證研究，藉此探究新興市場系統流動性之長期趨勢、規模效果及其與機構投資人持股之關係。實證結果發現，系統流動性與規模呈顯著的正向關係，且不同規模股票的系統流動性長期均呈現下降趨勢，又因大型股的降幅小於小型股，故大小型股的系統流動性差異隨時間經過而擴大。不同於過去文獻所探究之已開發市場，台灣證券交易所的機構投資人，僅國內投信基金持股對系統流動性具正向影響，而外資與國內其它機構投資人持股則大致具負向影響；換言之，相較於國內投信，外資與國內其它機構投資人更傾向於不頻繁交易的長期投資者。
An investigation of natural convection in parallel square plates with a heated top surface by a hybrid boundary condition
(2014-10-01)
Fu, Wu-Shung
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Wang, Wei-Hsiang
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Li, Chung-Gang
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機械工程學系
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Department of Mechanical Engineering
Natural convection in parallel squares plats with a heated top surface is investigated numerically. For solving a problem induced by different directions between the thermal diffusion and main flow streams, a hybrid boundary condition composed of the absorbing boundary condition and local one-dimensional inviscid relations (LODI) method is then adopted in artificial buffer zones. Methods of the Roe scheme, preconditioning and dual time stepping matching the Monotone Upstream-centered Schemes for Conservation Laws (MUSCL) are used to solve low speed compressible flows caused by natural convection. The results show that the hybrid boundary condition successfully prevents the rebound of heat energy from the artificial buffer zone back to the domain. The area-averaged Nusselt numbers of this study are slightly larger than those of existing experimental results, and the averaged deviation is about 10%. (C) 2014 Elsevier Masson SAS. All rights reserved.
Colorimetric detection of Cd(II) ions based on di-(1H-pyrrol-2-yl)methanethione functionalized gold nanoparticles
(2014-10-01)
Sung, Yi-Ming
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
A sensitive and selective colorimetric Cd2+ detection method was developed using di-(1H-pyrrol-2-yl)methanethione functionalized gold nanoparticles (DP-AuNPs). Aggregation of DP-AuNPs was induced immediately in the presence of Cd2+, yielding a color change from red to blue. This Cd2+-induced aggregation of DP-AuNPs was monitored using the naked eye and UV-vis spectroscopy. The SPR absorbance( 635 nm) of the reaction between DP-AuNPs and Cd2+ shows a good linearity in the Cd2+ concentration range of 0.5-16 mu M and a low detection limit 16.6 nM (S/N = 3). The DP-AuNPs showed excellent selectivity toward Cd2+ compared to other metal ions Ag+, Al3+, Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe2+, Fe3+, Hg2+, Mg2+, Mn2+, Ni2+, Pb2+, and Zn2+. Optimal detection of Cd2+ was achieved over a pH range from 4 to 9.5. Furthermore, DP-AuNPs were applied to detect Cd2+ in lake water, showing low interference. (C) 2014 Elsevier B.V. All rights reserved.
半導體元件製造方法
(2014-10-01)
劉柏村
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鄧立峯
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羅婉柔
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李耀仁
本發明提供一種半導體元件製造方法,用以增强一半導體元件之效能,上述製造方法至少包含下列步驟:首先,形成一閘極層於一基板上。接著,形成一閘極絕緣層於閘極層上,再形成一主動層於閘極絕緣層上。其中,上述主動層係由一微波吸收材料所組成。最後,定義一源/汲極於主動層上,並進行一微波退火程序,以形成半導體元件。