Browsing by Issue Date, starting with "2011-09-27"

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Long-length fiber Bragg creating sequential UV writing by probing phase mask
(2011-09-27)
Hsu Kuei-Chu
;
Lai Yin-Chieh
;
Hsin Chen-Wei
A new fiber position monitoring method for sequential FBG UV-writing processes with a reference phase mask as the phase reference is proposed. Also, the new method by probing a reference phase mask can overcome the optical alignment difficulties in using reference fiber as well as provide more signal power for achieving better monitoring accuracy. Moreover, the present invention provides a method for sequentially joining a plurality of grating sections into a fiber grating longer than a phase mask.
談契訶夫小說的女性形象
(2011-09-28)
劉皇杏
;
開放教育推動中心
;
Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
Collinear Holographic Storage Method and Apparatus
(2011-09-29)
SUN Ching-Cherng
;
YU Yeh-Wei
In the specification and drawings, a collinear holographic storage method is described and shown with a controlling step to control the temperature of the collinear holographic storage media such that the writing temperature of the collinear holographic storage media is from between about 5° C. to about 50° C. higher than the reading temperature of the collinear holographic storage media.
Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO3
(2011-09-29)
Zhang, J. X.
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He, Q.
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Trassin, M.
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Luo, W.
;
Yi, D.
We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO3 phase. The physical origin of this remarkable enhancement of ferroelectric polarization has been investigated by a combination of x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to the oxygen octahedra, combined with the contribution of Bi 6s lone pair electrons, is the mechanism driving the large ferroelectric polarization in this tetragonal-like phase.
Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO(3)
(2011-09-29)
Zhang, J. X.
;
He, Q.
;
Trassin, M.
;
Luo, W.
;
Yi, D.
We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO(3) phase. The physical origin of this remarkable enhancement of ferroelectric polarization has been investigated by a combination of x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to the oxygen octahedra, combined with the contribution of Bi 6s lone pair electrons, is the mechanism driving the large ferroelectric polarization in this tetragonal-like phase.
Rashba-type spin accumulation near a void at a system edge
(2011-09-30)
Wang, L. Y.
;
Chu, C. S.
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電子物理學系
;
Department of Electrophysics
We consider the spatial distribution of spin accumulation S(z) near a void (edge void) located at a system edge. The edge void is semicircular in shape with a radius R(0) approximate to l(so), the spin-relaxation length, and it is formed out of a Rashba-type two-dimensional electron system in the diffusive regime. The nonuniform driving field provides the essential condition, and diffusive contributions to the spin currents from spin polarizations provide the primary impetus for the spin accumulation. The edge void reveals an underlying asymmetry of the bulk-void counterpart, namely, a finite bulklike spin flow at the system edge. This bulklike spin flow gives rise to spin accumulation when open boundary occurs. The bulklike spin flow is found to exhibit a similar spatial profile as that of Sz at the system edge. This bulklike spin flow is expected to be a primary impetus for local spin injection at the sample edge near the edge void when a local protrusion occurs. Spin orientation of the bulklike spin flow varies with the locations on the edge-void boundary.
Exploring human resource (HR) account managers competency in semiconductor industry
(2011-09-30)
Wang, Yau-De
;
交大名義發表
;
National Chiao Tung University
Current competency research in Asia mostly aims at building competency models for a certain job, or studies the relationship between competency and personal / organizational performance. However, ambiguities exist for the definitions and measurements of competency, while the lack of "context" in the definition so as to distinguish competency from traditional job qualifications is a serious flaw. This study takes into account the context-dependent (or situational) nature of competency, as the work role played or as conceived by an HR account manager (which serves as the "context") influences his/her work competency. Through in-depth interviews with a semiconductor foundry's human resource (HR) account managers based in Taiwan, as well as our extensive literature review on job competency, we propose a framework and confirm that managers with higher competency tend to take a more open, comprehensive and customer-oriented approach that emphasizes interacting with people, while managers with lower competency see work as a number of separate steps focused on the input of parameters and result output, and tend to take a closed, partial and mechanical view of their job roles.
Efficiency and productivity of the Chinese railway system: Application of a multi-stage framework
(2011-09-30)
Li, Lan-bing
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Hu, Jin-Li
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經營管理研究所
;
Institute of Business and Management
This paper models railway operation into three processes: The production process (output/input), the consumption process (consumption/output), and the earnings process (earnings/consumption), making a unified multi-stage framework to measure the performance of Chinese railway bureaus from 1999 to 2008. Firstly, data envelopment analysis (DEA) model is employed to evaluate production efficiency, consumption effectiveness, and earnings effectiveness from the static viewpoint. Secondly, Malmquist TFP index is applied to measure production productivity, consumption productivity, and earnings productivity from the dynamic viewpoint. Thirdly, it assesses the performance of the Chinese railway management system reform in 2005 on railway operations by using an average cumulative Malmquist TFP index.
TiO(2-x) nanoparticles synthesized using He/Ar thermal plasma and their effectiveness on low-concentration mercury vapor removal
(2011-10-01)
Tsai, Cheng-Yen
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Hsi, Hsing-Cheng
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Bai, Hsunling
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Fan, Kuo-Shuh
;
Chen, Chienchih
Oxygen-vacant titanium dioxide (TiO(2-x) ) nanoparticles were synthesized using thermal plasma as a heating source at various applied plasma currents and He/Ar ratios. Samples with diverse characteristics were developed and the mercury removal effectiveness was subsequently evaluated. TiO(2) nanoparticles possessing high purity and uniform particle sizes were successfully synthesized using metal titanium and O(2) as precursors and Ar as plasma gas. TiO(2-x) in anatase phase with a particle size at 5-10 nm was formed at the He/Ar volume ratio of 25/75. Further increasing the He/Ar ratio elevated the plasma temperature, causing the tungsten to melt, vaporize from the cathode, and then dope into the formed TiO(2) nanoparticles. The doped W appeared to inhibit the growth of nanoparticles and decrease the crystallinity of formed anatase. The effectiveness of oxygen-vacant sites on Hg(0) removal under the visible light circumstance was confirmed. Hg(0) removal by the TiO(2-x) nanoparticles was enhanced by increasing the O(2) concentration. However, moisture reduced Hg(0) capture, especially when light irradiation was applied. The reduction in Hg(0) capture may be resulted from the competitive adsorption of H(2)O on the active sites of TiO(2-x) with Hg(0) and transformed Hg(2+).
High-power 10-GHz self-mode-locked Nd:LuVO(4) laser
(2011-10-01)
Huang, Y. J.
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Liang, H. C.
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Chen, Y. F.
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Zhang, H. J.
;
Wang, J. Y.
We report on a high-power diode-end-pumped self-mode-locked Nd:LuVO(4) laser with the pulse repetition rate up to 9.52 GHz for the first time. The large third-order nonlinearity of the Nd:LuVO(4) crystal is exploited to efficiently achieve a fairly stable self-mode-locked operation without any additional components. The detailed characteristics of the compact efficient self-mode-locked laser are experimentally investigated and theoretically analyzed. With the incident pump power of 2.6 W, the average output power up to 0.54 W is generated with the pulse width of 7.9 ps at the pulse repetition rate of 9.52 GHz.
A practical authentication protocol with anonymity for wireless access networks
(2011-10-01)
Chen, Yen-Cheng
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Chuang, Shu-Chuan
;
Yeh, Lo-Yao
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Huang, Jiun-Long
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資訊工程學系
The use of anonymous channel tickets was proposed for authentication in wireless environments to provide user anonymity and to probably reduce the overhead of re-authentications. Recently, Yang et al. proposed a secure and efficient authentication protocol for anonymous channel in wireless systems without employing asymmetric cryptosystems. In this paper, we will show that Yang et al.'s scheme is vulnerable to guessing attacks performed by malicious visited networks, which can easily obtain the secret keys of the users. We propose a new practical authentication scheme not only reserving the merits of Yang et al.'s scheme, but also extending some additional merits including: no verification table in the home network, free of time synchronization between mobile stations and visited networks, and without obsolete anonymous tickets left in visited networks. The proposed scheme is developed based on a secure one-way hash function and simple operations, a feature which is extremely fit for mobile devices. We provide the soundness of the authentication protocol by using VO logic. Copyright (C) 2010 John Wiley & Sons, Ltd.
Plasmonic Green Nanolaser Based on a Metal-Oxide-Semiconductor Structure
(2011-10-01)
Wu, Chen-Ying
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Kuo, Cheng-Tai
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Wang, Chun-Yuan
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He, Chieh-Lun
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Lin, Meng-Hsien
Realization of smaller and faster coherent light sources is critically important for the emerging applications in nanophotonics and information technology. Semiconductor lasers are arguably the most suitable candidate for such purposes. However, the minimum size of conventional semiconductor lasers utilizing dielectric optical cavities for sustaining laser oscillation is ultimately governed by the diffraction limit (similar to(lambda/2n)(3) for three-dimensional (3D) cavities, where lambda is the free-space wavelength and n is the refractive index). Here, we demonstrate the 3D subdiffraction-limited laser operation in the green spectral region based on a metal oxide semiconductor (MOS) structure, comprising a bundle of green-emitting InGaN/GaN nanorods strongly coupled to a gold plate through a SiO(2) dielectric nanogap layer. In this plasmonic nanocavity structure, the analogue of MOS-type "nanocapacitor" in nanoelectronics leads to the confinement of the plasmonic field into a 3D mode volume of 8.0 x 10(-4) mu m(3) (similar to 0.14(lambda/2n)(3)).
Drag Coefficient of a Spherical Particle Attached on the Flat Surface
(2011-10-01)
Liu, Chun-Nan
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Chien, Chih-Liang
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Lo, Chu-Chun
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Lin, Guan-Yu
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Chen, Sheng-Chieh
The previous analytical solution for the drag coefficient (C(d)) for a spherical particle attached on the flat surface, which was derived by O'Neill (1968), is only valid in the creeping flow conditions. It is important to extend O'Neill's formula to cover a wide range of particle Reynolds number (Re(p)). In this study, the drag coefficient was calculated numerically to cover Re(p) from 0.1 to 250. For a particle suspended in the air, an empirical drag coefficient exists, which is defined as C(d) = f x 24/Re(p), where f is a correction factor depending on Re(p). The applicability of the correction factor f for O'Neill's analytical equation for the spherical particle attached on the flat surface for Re(p) = 0.1 to 250 was examined in this study.
CTAP-Minimized Scheduling Algorithm for Millimeter-Wave-Based Wireless Personal Area Networks
(2011-10-01)
Chao, Hsi-Lu
;
Hsu, Ming-Pei
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資訊工程學系
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Department of Computer Science
Beamforming is used in IEEE 802.15.3c networks to avoid high propagation attenuation and path loss and improve the overall system throughput by exploiting spatial channel reuse. In this paper, we introduce design challenges of scheduling in beamforming-enabled IEEE 802.15.3c networks. These challenges include positioning, axis alignment, and interference relation verification. We then propose a joint design of axis alignment, positioning, and scheduling. The objectives of the proposed joint design are to reduce the consumed channel time, increase the degree of spatial channel reuse, and improve the channel utilization. For positioning, we define and prove a sufficient condition for anchor selection to improve positioning accuracy. The designed channel time allocation period (CTAP)-minimized scheduling algorithm is depicted as a two-layer flow graph, and it consists of the following three phases: 1) layer-1 edge construction; 2) layer-2 edge construction; and 3) scheduling. Through the observation of transmission and reception beams, we define a rule to verify the interference relation of two flows. In addition, given correct topology information, we prove that CTAP-minimized uses the least time to serve all data flows. We evaluate and compare our algorithm with existing approaches through simulations. The observed performance metrics include utilized channel time, system throughput, scheduling efficiency, and spatial channel reuse degree. The results show that CTAP-minimized performs well and achieves its objectives.
Growth of CuInSe2 and In2Se3/CuInSe2 Nano-Heterostructures through Solid State Reactions
(2011-10-01)
Hsin, Cheng-Lun
;
Lee, Wei-Fan
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Huang, Chi-Te
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Huang, Chun-Wei
;
Wu, Wen-Wei
In2Se3 is an essential phase change material and CuInSe2 is the fundamental basis of the copper-indium-gallium-diselenide (CIGS) solar energy material. In this paper, we demonstrate the feasibility to transform the phase change material to the solar energy material via the solid state reaction. The In2Se3 nanobelts (NBs) were synthesized via the vapor-liquid-solid mechanism. The chemical composition and the optical properties were investigated by energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and reflectance and photoluminescence spectra. In the in situ observation of the solid state reaction with Cu to form the CuInSe2 NBs with ultrahigh vacuum transmission electron microscopy, we observed the In2Se3/CuInSe2 transformation at atomic scale in real time. The progression of the atomic layer at the interface provided the pertinent information on the kinetic mechanism. In2Se3/CuInSe2 nano-heterostructures were also obtained in the present investigation. The approach to the CIGS nanosolar cell was also proposed. This study shall be beneficial in the development of high-performance nanowire solar cells and nanodevices with In2Se3/CuInSe2 nano-heterostructures.
Large Scale Single-Crystal Cu(In,Ga)Se-2 Nanotip Arrays For High Efficiency Solar Cell
(2011-10-01)
Liu, Chin-Hung
;
Chen, Chia-Hsiang
;
Chen, Szu-Ying
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Yen, Yu-Ting
;
Kuo, Wei-Chen
In this paper, we demonstrated direct formation of large area Cu(In,Ga)Se-2, nanotip arrays (GIGS NTRs) by using one step Ar+ milling process without template. By controlling milling time and incident angles, the length of CIGS NTRs with adjustable tilting orientations can be precisely controlled. Formation criteria of these CIGS NTRs have been discussed in terms of surface curvature, multiple components, and crystal quality, resulting in a highly anisotropic milling effect. The CIGS NTRs have very low reflectance <0.1% at incident wavelengths between 300 to 1200 nm. Open circuit voltage and short circuit current of CIGS NTRs solar cell were measured to be similar to 390 mV and similar to 22.56 mA/cm(2), yielding the filling factor and the efficiency of 59 and 5.2%, respectively. In contrast to CIGS thin film solar cell with efficiency of 3.2%, the nanostructured CIGS NTRs can have efficiency enhancement of similar to 160% due to the higher light absorption ability because of the nanostructure. The merits of current approach include the latest way via template-free direct creating process of nanostructured CIGS NTRs with controllable dimensionality and large scale production without postselenization process.
台商對外投資大陸之區位順序選擇行為：層級貝氏順序羅吉斯迴歸模型之應用
(2011-10-01)
陳靜怡
;
Ching-I Chen
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Institute of Business and Management
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經營管理研究所
本研究根據台灣廠商至大陸投資的區位順序選擇行爲，驗證區位優勢理論及國際化程序的觀點。典型的對外投資區位選擇研究係以區位特性做爲自變數，應變數則可分爲兩類：投資地點的總合投資量及廠商之投資地點選擇；前者無法探討個別廠商的決策行爲，後者則不易估計廠商層次的參數估計。因此，本研究根據個別廠商對陸投資地點的先後順序，搭配投資地點的區位優勢（如市場潛力、勞工便宜、交通便利、聚集經濟等）以及投資前置時間，討論廠商之投資區位偏好及學習效果。有別於以平均效果估計爲實證結果的傳統統計模型，本研究建立層級貝氏順序羅吉斯迴歸模型，整合不同分析層次的資料，用以衡量廠商間具異質性的投資偏好結構，並以廠商比例的概念說明研究假說的實證結果，符合資源基礎理論的邏輯。
The dynamic dependence between the Chinese market and other international stock markets: A time-varying copula approach
(2011-10-01)
Wang, Kehluh
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Chen, Yi-Hsuan
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Huang, Szu-Wei
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資訊管理與財務金融系註：原資管所+財金所
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Department of Information Management and Finance
The purpose of this paper is to study the dependence structures between the Chinese market and other major world markets, a reflection of China's increasing integration into the global economy. We used time-varying copula models to show that conditional copulas outperform both unconditional copulas and conventional GARCH models. We consistently found the Chinese market to have the highest levels of dependence, as well as the greatest variability in dependence, with markets in Japan and the Pacific. Our results provide investors interested in the Chinese market with more timely suggestions for portfolio diversification, risk management, and international asset allocation than those derived from static models. (C) 2010 Elsevier Inc. All rights reserved.
Wavefront-based pixel inversion algorithm for generation of subresolution assist features
(2011-10-01)
Yu, Jue-Chin
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Yu, Peichen
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Chao, Hsueh-Yung
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光電工程學系
;
Department of Photonics
The generation of subresolution assist features (SRAFs) using inverse-lithography techniques demands extensive computational resources which limits its deployment in advanced CMOS nodes. In this paper, we propose a wavefront-based pixel inversion algorithm to quickly obtain inverse masks with a high aerial image quality. Further assisted by a flexible pattern simplification technique, we present effective SRAF generation and placement based on the calculated inverse mask. The proposed approach can be easily inserted prior to a conventional mask correction flow for subsequent concurrent optimizations of both drawn patterns and SRAFs. The innovative pixel inversion and pattern simplification techniques allow quality mask corrections as produced by inverse lithography while maintaining the convenience of standardized/validated process flows currently used in the industry. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI:10.1117/1.3663249]
Expression Status of Ribonucleotide Reductase Small Subunits hRRM2/p53R2 as Prognostic Biomarkers in Stage I and II Non-small Cell Lung Cancer
(2011-10-01)
Hsu, Nan-Yung
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Wu, Jeng-Yuan
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Liu, Xiyong
;
Yen, Yun
;
Chen, Chih-Yi
Overexpression of ribonucleotide reductase M2 (hRRM2) and p53-dependent RR small subunit (p53R2) has been correlated with tumor malignancy and progression in several types of cancer. The aim of this study was to determine the association of p53R2/hRRM2 expression with clinicopathological characteristics of stage I and II non-small cell lung cancer (NSCLC). Immunohistochemistry was conducted on a tissue array that included 92 samples. Correlations between hRRM2 and p53R2 expression and clinicopathological factors, recurrence/metastasis, and outcomes were analyzed. The analyses revealed that there was no correlation between p53R2 expression and clinicopathological factors; hRRM2 was only positively related to poor tumor differentiation (p=0.006). Regarding overall survival during the follow-up period, patients with p53R2+/hRRM2- tumors had the best outcomes (p<0.01). Multivariant Cox analysis revealed that p53R2 (risk=0.232, 95% CI=0.086-0.626, p=0.004) not only served as a prognostic biomarker to predict survival, but also as an independent biomarker to predict disease-free survival (risk=0.545, 95% CI=0.301-0.987, p=0.045) of patients with NSCLC. Therefore, we consider that the expression of p53R2 can be used not only as a biomarker for overall survival, but also as an indicator for tumor recurrence. Based on our finding, p53R2 expression seems more important than that of hRRM2 in prognosis of early-stage lung cancer.