Browsing by Issue Date, starting with "2011-02-28"

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Ultra fast self-corrected polarization modulated ellipsometer
(2011-02-28)
Tsai, Hsiu-Ming
;
Chen, Leng-Chun
;
Chao, Yu-Faye
;
光電工程學系
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Department of Photonics
A high speed self-corrected algorithm is proposed for the polarization modulated ellipsometry (PME). In this post-flight analysis, we prove that a set of optimized ellipsometric parameters (EPs) can be obtained by using the intensities at 4 specific temporal phases. The correction ability to its initial phase by this technique has been demonstrated through a twisted nematic liquid crystals (TN-LC) cell under the driving of a square wave. Furthermore, the optimal modulation amplitude in obtaining the accurate and precise set of EPs will be discussed in this work. (C) 2011 Elsevier B.V. All rights reserved.
Characterization of write-once blu-ray disk containing Cu-Al/Si recording layer using transmission electron microscopy
(2011-02-28)
Mai, Hung-Chuan
;
Hsieh, Tsung-Eong
;
Jeng, Shiang-Yao
;
材料科學與工程學系
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Department of Materials Science and Engineering
Microstructure change in write-once blu-ray disk containing Cu-Al/Si recording layer was investigated by transmission electron microscopy. Nanoscale crystallites were found to comprise of the Cu-Al/Si recording layer before and after signal writing and the energy dispersive spectroscopy revealed insignificant composition fluctuation in disk sample. Analytical results indicated the signal properties of disk samples are correlated with a moderate improvement of crystallinity and the formation of Cu and Si solid-solution phases due to element mixing in mark area, rather than the formation of Cu(3)Si silicide and recrystallization of recording layer as reported by previous studies. (C) 2011 American Institute of Physics. [doi:10.1063/1.3560053]
Characteristics of exciton-polaritons in ZnO-based hybrid microcavities
(2011-02-28)
Chen, Jun-Rong
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Lu, Tien-Chang
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Wu, Yung-Chi
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Lin, Shiang-Chi
;
Hsieh, Wen-Feng
Wide bandgap semiconductors are promising materials for the development of polariton-based optoelectronic devices operating at room temperature (RT). We report the characteristics of ZnO-based microcavities (MCs) in the strong coupling regime at RT with a vacuum Rabi splitting of 72 meV. The impact of scattering states of excitons on polariton dispersion is investigated. Only the lower polariton branches (LPBs) can be clearly observed in ZnO MCs since the large vacuum Rabi splitting pushes the upper polariton branches (UPBs) into the scattering absorption states in the ZnO bulk active region. In addition, we systematically investigate the polariton relaxation bottleneck in bulk ZnO-based MCs. Angle-resolved photoluminescence measurements are performed from 100 to 300 K for different cavity-exciton detunings. A clear polariton relaxation bottleneck is observed at low temperature and large negative cavity detuning conditions. The bottleneck is suppressed with increasing temperature and decreasing detuning, due to more efficient phonon-assisted relaxation and a longer radiative lifetime of the polaritons. (C) 2011 Optical Society of America
Impact of static and dynamic stress on threshold voltage instability in high-k/metal gate n-channel metal-oxide-semiconductor field-effect transistors
(2011-02-28)
Dai, Chih-Hao
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Chang, Ting-Chang
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Chu, Ann-Kuo
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Kuo, Yuan-Jui
;
Lo, Wen-Hung
This letter investigates the impact of static and dynamic stress on threshold voltage (V(th)) instability in ultrathin n-channel metal-oxide-semiconductor field-effect transistors with hafnium-based gate stacks. Experimental results indicate V(th) shift under dynamic stress is more serious than that under static stress due to charge trapping within the high-k dielectric. Capacitance-voltage techniques demonstrated that electron trapping under dynamic stress was located in the high-k dielectric near the source/drain overlap region rather than throughout the overall dielectric layer. This implies in real circuit operation, the phenomenon of electrons trapped in high-k near the source/drain overlap is the main issue affecting V(th) instability. (C) 2011 American Institute of Physics. [doi:10.1063/1.3560463]
An electrically tunable optical zoom system using two composite liquid crystal lenses with a large zoom ratio
(2011-02-28)
Lin, Yi-Hsin
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Chen, Ming-Syuan
;
Lin, Hung-Chun
;
光電工程學系
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Department of Photonics
An electrically tunable-focusing optical zoom system using two composite LC lenses with a large zoom ratio is demonstrated. The optical principle is investigated. To enhance the electrically tunable focusing range of the negative lens power of the LC lens for a large zoom ratio, we adopted two composite LC lenses. Each composite LC lens consists of a sub-LC lens and a planar polymeric lens. The zoom ratio of the optical zooming system reaches similar to 7.9:1 and the object can be zoomed in or zoomed out continuously at the objective distance of infinity to 10 cm. The potential applications are cell phones, cameras, telescope and pico projectors. (C) 2011 Optical Society of America
Phase-modulated ellipsometry for probing the temperature-induced phase transition in ruthenium-doped lead zinc niobate-lead titanate single crystal
(2011-02-28)
Chuang, Chun-I
;
Marinova, Vera
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Lin, Shiuan-Huei
;
Chao, Yu-Faye
;
電子物理學系
Phase-modulated ellipsometry was applied to measure changes in the refractive index of pure and ruthenium (Ru)-doped 0.9Pb (Zn(1/3)Nb(2/3))O(3)(PZN)-0.1 PbTiO(3) (PT) during the heating process in real time. Both samples were heated from room temperature to 200 degrees C in a thermally insulated chamber. In both samples, the phase transitions were observed to change from tetragonal to cubic. The temperature region at which the phase transition (Curie region) of Ru-doped 0.9PZN-0.1PT occurred not only broadened but also shifted to a lower temperature. The refractive indices were extremely stable in this region, meaning that Ru-doped 0.9PZN-0.117 is a more favorable medium for the fabrication of optical memories. (C) 2011 Elsevier B.V. All rights reserved.
Design and analysis of radial imaging capsule endoscope (RICE) system
(2011-02-28)
Ou-Yang, Mang
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Jeng, Wei-De
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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
In this study, a radial imaging capsule endoscope (RICE) system is designed, which differs from a conventional front imaging capsule endoscope (FICE) system. To observe the wrinkled intima of the intestine, which spreads without folding around the circumference of the capsule when a capsule endoscope with a diameter that slightly exceeds that of the intestine passes through it, the RICE uses a cone mirror, a radial window shell, and a focus optical module that comprise the radial imaging system. This concept was demonstrated in a packaged optical simulator. The RICE optical model also has been established and verified by many simulations and experiments. In minimizing the sagittal and tangential aberrations, the optical module of the RICE has achieved an F-number of 4.2, a viewing angle of 65.08 degrees, and an RMS radius of the 4th to 6th fields of less than 17 um. A comparison of these characteristics with those of the focus optical module that is used in FICE lenses reveals that the spot size is 50% larger for each field, and the modulation transfer function (MTF) is remarkably improved from 7% to 36% at 100 lp/mm on the 5th field of the sagittal plane. (C) 2011 Optical Society of America
Anticorrelation between the splitting and polarization of the exciton fine structure in single self-assembled InAs/GaAs quantum dots
(2011-02-28)
Lin, Chia-Hsien
;
You, Wen-Ting
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Chou, Hsiang-Yu
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Cheng, Shun-Jen
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Lin, Sheng-Di
We report on a systematic correlation between the fine-structure splitting and polarization anisotropy of excitons in InAs/GaAs quantum dots, but with an unexpected reversal in order of the polarization eigenaxes. Such an anticorrelation is explained by a large valence-band-mixing induced splitting due to the shape and strain anisotropies. The strength and phase of valence band mixing are also found to play an important role in the tuning of fine structure splitting using an in-plane magnetic field.
An integrated MCDM technique combined with DEMATEL for a novel cluster-weighted with ANP method
(2011-03-01)
Yang, Jiann Liang
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Tzeng, Gwo-Hshiung
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科技管理研究所
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Institute of Management of Technology
Traditionally, most importance-assessing methods used to demonstrate the importance among criteria by preference weightings are based on the assumptions of additivity and independence. In fact, people have found that using such an additive model is not always feasible because of the dependence and feedback among the criteria to somewhat different degrees. To solve the issue the analytic network process (ANP) method is proposed by Saaty. The general method is easy and useful for solving the above-mentioned problem. However in ANP procedures, using average method (equal cluster-weighted) to obtain the weighted supermatrix seems to be irrational because there are different degrees of influence among the criteria. Therefore, we intended to propose an integrated multiple criteria decision making (MCDM) techniques which combined with the decision making trial and evaluation laboratory (DEMATEL) and a novel cluster-weighted with ANP method in this paper, in which the DEMATEL method is used to visualize the structure of complicated causal relationships between criteria of a system and obtain the influence level of these criteria. And, then adopt these influence level values as the base of normalization supermatrix for calculating ANP weights to obtain the relative importance. Additionally, an empirical study is illustrated to demonstrate that the proposed method is more suitable and reasonable. By the concept of ideal point, some important conclusions drawn from a practical application can be referred by practitioners. (C) 2010 Elsevier Ltd. All rights reserved.
Calix[4]arene with Lower-Rim beta-Amino alpha,beta-Unsaturated Ketones Containing Bis-Chelating Sites as a Highly Selective Fluorescence Turn-On Chemosensor for Two Copper(II) Ions
(2011-03-01)
Ho, I-Ting
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Chu, Jean-Ho
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Chung, Wen-Sheng
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應用化學系
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Department of Applied Chemistry
We report herein the synthesis of a fluorescence turn-on chemosensor, 25,27-bis{N-[1-(4-{[4-amino-4-(1-naphthyl)-2oxo- 3-butenyl]oxy}phenyl)aminocarbonyl]methoxy}-26,28-dihydroxycalix[4]arene (3b), which is highly selective toward Cu(2+). The fluorescence intensity of 3b was enhanced upon adding [Cu(ClO(4))(2)], which reached a maximum with approximately 4 equiv. of Cu(2+) but then started to decrease in intensity at higher Cu(2+) concentrations. Job plot experiments revealed a 1:2 binding stoichiometry of 3b with Cu(2+). Based on (1)H NMR titration results, we infer that there are two possible binding sites for Cu(2+) in 3b: one at the lower-rim phenolic-OH and amide groups, and the second at the beta-amino alpha,beta-unsaturated ketone groups. It is important to note that during the complexation of 3b with [Cu(ClO(4))(2)], the Cu(2+) ions were reduced to Cu(+) by both the phenolic OH and the amines of the beta-amino alpha,beta-unsaturated ketones. Furthermore, control compounds 6 and 9b were synthesized to clarify the possible binding sites of Cu(2+) in 3b. By comparing the binding constants of 3b, 6, and 9b with Cu(2+), we found that 3b exhibited a positive allosteric behavior toward the coordination of two Cu(2+) ions.
High-Performance Poly-Si Nanowire Thin-Film Transistors Using the HfO2 Gate Dielectric
(2011-03-01)
Lee, Chen-Ming
;
Tsui, Bing-Yue
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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-performance polycrystalline-silicon (poly-Si) nanowire (NW) thin-film transistors (TFTs) using hafnium dioxide (HfO2) as gate dielectric is successfully fabricated for the first time. The excellent short-channel characteristics are attributed to the high-kappa gate dielectric, ultrathin poly-SiNW channel thickness, and omega-shaped gate structure. The record high driving capability of 549 mu A/mu m results from the ultrashort gate length (L-G), thin equivalent oxide thickness, and Ni silicide metal source/drain. This letter reveals the opportunity of high-performance poly-Si TFT circuits for system-on-panel and 3-D integrated circuit (3-D IC) applications.
Design and Implementation of Readout Circuit with Threshold Voltage Compensation on Glass Substrate for Touch Panel Applications
(2011-03-01)
Lin, Yu-Ta
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Ker, Ming-Dou
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Wang, Tzu-Ming
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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
A new on-panel readout circuit with threshold voltage compensation for capacitive sensor in low temperature polycrystalline silicon (poly-Si) thin-film transistor (LTPS-TFT) process has been proposed. In order to compensate the threshold voltage variation from LTPS process variation, the proposed readout circuit applies a novel compensation approach with switch capacitor technique. In addition, a 4-bit analog-to-digital converter ( ADC) is added to identify different sensed capacitor values and further enhances the overall resolution of touch panel. (c) 2011 The Japan Society of Applied Physics
「速寫與目力測量」課程成果展－「梭—線條的可能性」
(國立陽明大學, 2011-03)
Efficient Detection Algorithms for MIMO Communication Systems
(2011-03-01)
Wu, Di-You
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Van, Lan-Da
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資訊工程學系
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Department of Computer Science
In this paper, two new efficient detection algorithms, Type 1 (T1) with better complexity-performance tradeoff and Type 2 (T2) with lower complexity, are derived from one generalized framework for multiple-input multiple-output (MIMO) communication systems. The proposed generalized detection framework constructed by parallel interference cancellation (PIC), group, and iteration techniques provides three parameters and three sub-algorithms to generate two efficient detection algorithms and conventional BLAST-ordered decision feedback (BODF), grouped, iterative, and B-Chase detection algorithms. Since the group interference suppression (GIS) technique is applied to the proposed detection algorithms, the complexities of the preprocessing (PP) and tree search (TS) can be reduced. In (8,8) system with uncoded 16-QAM inputs, one example of the T1 algorithm can save complexity by 21.2% at the penalty of 0.6 dB loss compared with the B-Chase detector. The T2 algorithm not only reduces complexity by 21.9% but also outperforms the BODF algorithm by 3.1 dB.
Two Tests for Supplier Selection Based on Process Yield
(2011-03-01)
Pearn, W. L.
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Liao, Mou-Yuan
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Wu, Chien-Wei
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Chu, Yao-Tsung
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工業工程與管理學系
Market share is highly corrected with customer satisfaction and business success; many companies increase their outsourcing level to keep their core competition. Supplier selection problems have become an important issue of production management. Process yield is a standard criterion in the manufacturing industry as a common measure on process performance. The index S(PK) provides an exact measure on the process yield for normal processes. However, most studies considered the assessment of index S(PK) for just one single supplier; the testing procedure for suppliers selection has not been done at present. Hence, the principal purpose of this research is to determine the more capable process between two competing suppliers. Two tests are presented based on S(PK), and four bootstrap methods are used for obtaining the test statistics. By Monte Carlo simulations, performance comparisons of these methods are performed in terms of empirical size and selection power. Finally, a case on the color filter manufacturing process is investigated to demonstrate the applicability of the proposed method.
Field Dependence of Porous Low-k Dielectric Breakdown as Revealed by the Effects of Line Edge Roughness on Failure Distributions
(2011-03-01)
Lee, S. C.
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Oates, A. S.
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Chang, K. M.
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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 investigate the electric field (E) dependence of the breakdown of porous low-k dielectrics by measuring the changes in the failure time distribution resulting from the presence of line edge roughness. We show that the Weibull beta increases with decreasing field, clearly demonstrating that dielectric breakdown does not exhibit 1/E or E(-n) characteristics.
Generalized synchronization of chaotic systems with different orders by fuzzy logic constant controller
(2011-03-01)
Li, Shih-Yu
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Ge, Zheng-Ming
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機械工程學系
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Department of Mechanical Engineering
The fuzzy logic constant controller (FLCC) is introduced in this paper. Unlike traditional method, a simplest controller is proposed via fuzzy logic design and Lyapunov direct method. Controllers in traditional method by Lyapunov direct method are always complicated or the functions of errors. We propose a new idea to design constant numbers as controllers, while the constant numbers are decided by the upper bound and the lower bound of the error derivatives. Via fuzzy logic rules, the strength of controllers in our new approach can be adjusted according to the error derivatives. Consequently, the slave system becomes exactly and efficiently synchronized to the trajectory of master system through FLCC. Two examples, Lorenz system and four order Chen-Lee system, are presented to illustrate the effectiveness of the new controllers in chaos generalized synchronization. (C) 2010 Elsevier Ltd. All rights reserved.
Deassociate the initial temporal phase deviation provided by photoelastic modulator for stroboscopic illumination polarization modulated ellipsometry
(2011-03-01)
Tsai, Hsiu-Ming
;
Chen, Chih-Wei
;
Tsai, Tsung-Han
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Chao, Yu-Faye
;
光電工程學系
In addition to operating the imaging ellipsometric measurements by four-specific temporal phases in the photoelastic modulated ellipsometry, we added the fifth one to solve the initial phase of the photoelastic modulator. This methodology has been developed to conquer the slow imaging processing of charge-coupled device camera for the stroboscopic illumination in the polarization modulated imaging ellipsometry. Without any calibration in its initial phase, we can perform the ellipsometric measurement by the measurements of intensity at five-specific temporal phases. The intensities of a full cycle for a point on SiO(2)/Si thin film were measured and analyzed for verifying this algorithm. The five stroboscopic illuminations were performed to measure the two-dimensional distribution of the same SiO(2)/Si thin film. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3568745]
Managing passenger behavioral intention: an integrated framework for service quality, satisfaction, perceived value, and switching barriers
(2011-03-01)
Jen, William
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Tu, Rungting
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Lu, Tim
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
This paper seeks to improve our understanding of passengers' behavioral intention by proposing an integrated framework from the attitudinal perspective. According to the literature in marketing research, we establish a causal relationship model that considers "service quality-satisfaction-behavioral intentions" paradigm, perceived value theory, and switching barrier theory. Exploring passengers' behavioral intention from satisfaction and perceived value help to understand how passengers are attracted by the company, while switching barriers assist in realizing how passengers are "locked" into a relationship with the current company. Furthermore, in order to capture the nature of service quality, we adopt a hierarchical factor structure which serves service quality as the higher-order factor. In this study, coach industry is selected as our research subject. The empirical results, as hypothesized, show that all causal relationships are statistically significant, and perceived value us the most important predictor of satisfaction and passengers' behavioral intention. In conclusion, the managerial implications and suggestions for future research are discussed.
「情感的亞洲」專題導言
(國立陽明交通大學出版社, 2011-03-01)
王智明