Browsing by Issue Date, starting with "2013-06-26"

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Magnetic domain studies of La0.7Sr0.3MnO3 film deposited on SrLaAlO3 (001) substrate
(2013-06-26)
Liu, Chi-Ching
;
Chu, Pei-Yuan
;
Chiang, Yao-Wei
;
Juang, Jenh-Yih
;
Jen, Shien-Uang
Epitaxial 120 nm La0.7Sr0.3MnO3 (LSMO) compressively strained thin films were deposited on single-crystalline SrLaAlO3(0 0 1) (SLAO) substrates by the pulsed laser deposition (PLD) method. From the x-ray diffraction study, we confirmed that the c-axis of the LSMO crystal pointed out of the film plane. Two kinds of magnetic experiments were performed on the film: (i) the in-plane (field H (sic) H-P) and the out-of-plane (field H (sic) H-N) magnetic hysteresis loop measurements and (ii) magnetic force microscopy scans. We have proved from both theory and experiment that the LSMO film should exhibit the weak and tilted perpendicular magnetic anisotropy at room temperature (RT), that is, the easy axis (EA) is tilted relative to the film normal by an angle theta(o) is approxiamtely equals to 37 degrees, when the film is in the demagnetized state. The magnetic domain (MD) structure of the demagnetized LSMO film showed a maze-like pattern. Although from the in-plane hysteresis loop, H-P = 600 Oe seems large enough to saturate the film, the corresponding MD structure was not in a single-domain state. Instead, there were two types of MDs: the canted MD and the saturated MD. The MD patterns of the LSMO film between the demagnetized and the remanent states were different. In addition, there were double-switch phenomena in the out-of-plane hysteresis loop. When vertical bar H-N vertical bar congruent to 140 Oe, a transition of the MD pattern from the maze-like to the closure (or dense-stripe) type occurred.
Distribution of Crystalline Polymer and Fullerene Clusters in Both Horizontal and Vertical Directions of High-Efficiency Bulk Heterojunction Solar Cells
(2013-06-26)
Liu, Chih-Ming
;
Su, Ming-Shin
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Jiang, Jian-Ming
;
Su, Yu-Wei
;
Su, Chun-Jen
In this study, we used (i) synchrotron grazing-incidence small-/wide-angle X-ray scattering to elucidate the crystallinity of the polymer PBTC12TPD and the sizes of the clusters of the fullerenes PC61BM and ThC61BM and (ii) transmission electron microscopy/electron energy loss spectroscopy to decipher both horizontal and vertical distributions of fullerenes in PBTC12TPD/fullerene films processed with chloroform, chlorobenzene and dichlorobezene. We found that the crystallinity of the polymer and the sizes along with the distributions of the fullerene clusters were critically dependent on the solubility of the polymer in the processing solvent when the solubility of fullerenes is much higher than that of the polymer in the solvent. In particular, with chloroform (CF) as the processing solvent, the polymer and fullerene units in the PBTC12TPD/ThC61BM layer not only give rise to higher crystallinity and a more uniform and finer fullerene cluster dispersion but also formed nanometer scale interpenetrating network structures and presented a gradient in the distribution of the fullerene clusters and polymer, with a higher polymer density near the anode and a higher fullerene density near the cathode. As a result of combined contributions from the enhanced polymer crystallinity, finer and more uniform fullerene dispersion and gradient distributions, both the short current density and the fill factor for the device incorporating the CF-processed active layer increase substantially over that of the device incorporating a dichlorobenzene-processed active layer; the resulting power conversion efficiency of the device incorporating the CF-processed active layer was enhanced by 46% relative to that of the device incorporating a dichlorobenzene-processed active layer.
Enhanced Light Harvesting with a Reflective Luminescent Down-Shifting Layer for Dye-Sensitized Solar Cells
(2013-06-26)
Hosseini, Zahra
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Huang, Wei-Kai
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Tsai, Cheng-Ming
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Chen, Teng-Ming
;
Taghavinia, Nima
For a dye-sensitized solar cell with a near-infrared squaraine (SQ1) sensitizer, the photovoltaic performance was enhanced remarkably with a reflective luminescent down-shifting (R-LDS) layer to increase the light-harvesting efficiency at the wavelength region 400-550 nm where the SQ1 dye has weak absorption. Relative enhancements greater than 200% in IPCE near 500 nm and 40-54% in J(SC) were achieved with red phosphor CaAlSiN3:Eu2+ as the LDS material, attaining 5.0 and 4.8% overall efficiencies of power conversion for the R-LDS layer coated on the counter electrode (front illumination) and working electrode (back illumination), respectively.
Simple and Fast Method To Fabricate Single-Nanoparticle-Terminated Atomic Force Microscope Tips
(2013-06-27)
Cheng, Hui-Wen
;
Chang, Yuan-Chih
;
Yuan, Chi-Tsu
;
Tang, Song-Nien
;
Chang, Chia-Seng
This paper introduces a simple, yet controllable scheme to pick up a single 13 nm Au nanoparticle (Au-NP) using the tip of an atomic force microscope (AFM) probe through the application of electrical biases between the tip and the Au-NP. Transmission electron microscope (TEM) images were acquired to verify that a single Au-NP was attached to the AFM probe. We postulate that the mechanism underlying the ability to manipulate individual Au-NPs at the apex of the AFM probe tip is Coulomb interaction induced by tip bias. The AFM tip with the attached Au-NP was then used to study the interaction between a single quantum dot (QD) and the Au-NP. The blinking behavior of single colloidal CdSe/ZnS core/shell QD was significantly suppressed with the approach of the 13 nm Au-NP attached to the AFM tip.
Method of Elliptic Curve Cryptography Using EW-MOF on Scalar Multiplication
(2013-06-27)
Ye Hung-Nan
;
Wang Kuo-Chen
;
Jan Rong-Hong
A method of elliptic curve cryptography (ECC) using the enhanced window-based mutual opposite form (EW-MOF) on scalar multiplication. First, an elliptic curve and a base point on the elliptic curve are selected. Next, essential pre-computed points for a selected window size are calculated. Then, a private key is randomly generated and the mutual opposite form (MOF) is used to convert the private key's binary representation into a signed binary representation. Finally, a public key is calculated by using the enhanced window (EW) method. By greatly reducing the number of essential pre-computed points, the EW-MOF reduces average key generation time (including pre-computation time).
A droplet manipulation on a liquid crystal and polymer composite film as a concentrator and a sun tracker for a concentrating photovoltaic system
(2013-06-28)
Tsou, Yu-Shih
;
Chang, Kai-Han
;
Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
We demonstrate a droplet manipulation on a liquid crystal and polymer composite film (LCPCF) as a concentrator and a sun tracker for a concentrating photovoltaic (CPV) system with a steady output electric power. The CPV system adopts a liquid lens on LCPCF whose curvature is not only tunable but position is also bistably switchable based on liquid crystal orientations on LCPCF. The change of curvature of the liquid lens results in a tunable concentration ratio which helps to increase photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination. Moreover, the change of the position of the liquid lens helps to track sun owing to sun movement. Therefore, the output power of such a system is steady no matter the sunlight condition and the angle of incident light. The operating principles and experiments are investigated. The concept in this paper can be extended to design optical components for obtaining steady output power of the solar cell at indoor or outdoor use and also tracking sunlight. (C) 2013 AIP Publishing LLC.
The Impact of CEO Characteristics on Corporate Sustainable Development
(2013-07-01)
Huang, Shihping Kevin
;
交大名義發表
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科技管理研究所
;
National Chiao Tung University
;
Institute of Management of Technology
This study explores the relationship between CEO demographic characteristics and consistency in corporate social responsibility (CSR) performance among firms. The sample is based on results from major ranking agencies between 2005 and 2010. A total of 661 firms were included in the sample with 392 observations in total. The results indicate that firms' CSR performance, as measured by the consistency of their CSR rankings, is associated with their CEOs' educational specializations in Master's-level business administration (MBA) and science (MSc). In addition, CEO tenure and gender are shown to affect firms' CSR performance. Furthermore, a firm's number of employees also has a significant relationship with its CSR performance. The results are encouraging for supporting universities' efforts to integrate CSR issues into their curricula. Copyright (c) 2012 John Wiley & Sons, Ltd and ERP Environment.
Force Sensor Design and Measurement for Endodontic Therapy
(2013-07-01)
Tsao, Chih-Chiang
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Lin, Fang-Yu
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Liou, Ji-Wei
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Wen, Ping-Han
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Peng, Chieh-Chung
To assist endodontic therapy, in this paper, a force sensor is designed and fabricated for measuring the axial force and the bending moment simultaneously. By detecting the bending moment, we can know the severity of bending. Axial force detection is also desired, as excessive axial forces may result in instrument buckling or even root canal perforation. This paper installs three sensing cells in each of two planes to detect the bending direction. Each sensing cell consists of a pressure-sensitive electric conductive rubber and an electrode. The size of the force sensor is 1.4-mm wide and 6-mm high for matching the size of endodontic instruments and making it feasible in the endodontic treatment. Experimental results on accuracy, repeatability, and nonlinearity are presented to validate the proposed sensor.
藥物載體原料及其製備方法和使用方法
(2013-07-01)
劉典謨
;
董簪華
;
程洪偉
本發明係一種藥物載體原料及其製造方法和使用方法，藥物載體原料係以化學鍵結的方式結合有具抗菌效果的改質有機幾丁聚醣和具有矽烷基的無機偶聯劑，本發明的藥物載體原料製造方法十分簡單，所形成的藥物載體原料可以在水溶液進行自組裝以包覆藥物，並可適用於多種藥物之包覆，亦具有生物相容性佳、藥物包覆率高和細胞吸收率良好之優點。
α－選擇性醣基化反應之方法
(2013-07-01)
蒙國光
;
趙晉陞
;
盧劭儒
;
劉知岳
一種α-選擇性醣基化反應之方法，係包括：利用具有甲醯胺結構之化合物與具有糖結構之供體反應，形成醣基亞胺化合物之中間產物，於一鍋式的環境中再與具有羥基之受體進行加成反應，藉此得到高α-選擇率之α-醣苷，且具有適合量產及易於回收該具有甲醯胺結構之化合物的優點。
Library-Based Illumination Synthesis for Critical CMOS Patterning
(2013-07-01)
Yu, Jue-Chin
;
Yu, Peichen
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Chao, Hsueh-Yung
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光電工程學系
;
Department of Photonics
In optical microlithography, the illumination source for critical complementary metal oxide semiconductor layers needs to be determined in the early stage of a technology node with very limited design information, leading to simple binary shapes. Recently, the availability of freeform sources permits us to increase pattern fidelity and relax mask complexities with minimal insertion risks to the current manufacturing flow. However, source optimization across many patterns is often treated as a design-of-experiments problem, which may not fully exploit the benefits of a freeform source. In this paper, a rigorous source-optimization algorithm is presented via linear superposition of optimal sources for pre-selected patterns. We show that analytical solutions are made possible by using Hopkins formulation and quadratic programming. The algorithm allows synthesized illumination to be linked with assorted pattern libraries, which has a direct impact on design rule studies for early planning and design automation for full wafer optimization.
中小企業薪資不均程度對其經營績效之影響－以台北縣製造業為例
(2013-07-01)
黃智聰
;
羅光達
;
陳寶惠
;
Jr-Tsung Huang
;
Kuang-Ta Lo
過去有關研究台灣中小企業經營績效的文獻，大都是從中小企業的財務結構，或是從其企業特性與經營規模方面進行分析，並無特別針對中小企業薪資結構與經營績效之關連性做深入的探討。本研究以台北縣中小企業當中的製造業為研究對象，利用2003年至2004年，本文獨特的營利事業所得稅與營業稅報稅資料，輔以各中小企業相關的登記資料後，在計算求得其代表薪資不均程度的吉尼係數與不同的經營績效指標，進而探討薪資不均程度對中小企業製造業在經營績效方面的影響。經由本文的實證結果發現，薪資不均程度對台北縣中小企業製造業在不同的經營績效指標上，皆呈現顯著的正向影響。此一結果表示，當企業的薪資不均程度提高，亦即薪酬制度愈呈現非齊一性時，將對中小企業製造業經營績效的提升有所助益。
Fibrous composites of piezoelectric and piezomagnetic phases
(2013-07-01)
Kuo, Hsin-Yi
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Bhattacharya, Kaushik
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土木工程學系
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Department of Civil Engineering
We propose a theoretical framework for evaluation of magnetoelectroelastic potentials in a fibrous composite with piezoelectric and piezomagnetic phases, motivated by the technological desire for materials with large magnetoelectric coupling. We show that the problem with transversely isotropic phases can be decomposed into two independent problems, plane strain with transverse electromagnetic fields and anti-plane shear with in-plane electromagnetic fields. We then consider the second problem in detail, and generalize the classic work of Lord Rayleigh (1892) to obtain the electrostatic potential in an ordered conductive composite and its extension to a disordered system by Kuo and Chen (2008) to the current coupled magnetoelectroelastic problem. We use this method to study BaTiO3-CoFe2O4 composites and provide insights into obtaining large effective magnetoelectric coefficient. (C) 2012 Elsevier Ltd. All rights reserved.
Computer simulation of electron energy state spin-splitting in nanoscale InAs/GaAs semiconductor quantum rings
(2013-07-01)
Li, Yiming
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資訊工程學系
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Department of Computer Science
In this paper, we model and computationally investigate the effect of spin-orbit interaction on the electron energy spectra for nanoscale semiconductor quantum rings. Our three-dimensional mathematical model considers the effective one-electron band Hamiltonian, the energy- and position-dependent electron effective mass approximation, and the spin-dependent Ben Daniel-Duke boundary conditions. The nonlinear iterative method is applied to solve the corresponding nonlinear eigenvalue problem, which converges monotonically for all energy states. Physically, it is found that the spin-dependent boundary conditions lead to a spin-splitting of the electron energy states with non-zero angular momentum in nanoscale InAs/GaAs quantum rings. The spin-splitting is strongly dependent upon the dimension of the explored quantum ring and is dominated by the inner radius, the base radius, and the height of the quantum ring. Under zero magnetic fields, the spin-splitting energy is decreased when the radius is increased. Meanwhile, it is greater than that of the InAs/GaAs quantum dot and demonstrates an experimentally measurable quantity (up to 2 meV) for relatively small semiconductor quantum rings. (C) 2012 Elsevier Ltd. All rights reserved.
高複雜度運輸地圖在有限空間中之顯像方法
(2013-07-01)
王昱舜
;
紀明德
本發明提供一種高複雜度運輸地圖在有限空間中之顯像方法，針對使用者所指定的起訖車站與中間所有經過的路線，對運輸路線進行不等比例的簡化變形，將站點之間的線段設為等長，將路線方向平角化，並微調站點的位置，以符合螢幕顯示區域之大小比例，便於閱讀，再於行經路線的站點附近標上名稱標誌，有助於使用者迅速瞭解乘車及轉乘資訊。
具有自我感測機制之光纖感測系統
(2013-07-01)
鄒志偉
;
祁甡
;
王家軒
;
施富元
;
葉建宏
本發明揭露一種具有自我感測機制之光纖感測系統，主要是以一中央控制室控制，控制一光纖感測器、一遠端節點，及一光偶合器所組成之次環結構，次環結構並進行串連，形成一主環結構，中央控制室具有可調雷射光源，可發送到光纖感測器上，光纖感測器具有反射功能，該可調雷射光源發出之光源，中央控制室可繪出光譜圖並比較分析斷點所在。本發明可大幅提升所有光纖感測器之生存力及感測能力，避免因環境變化導致光纖出現斷點，而影響到感測機制運行，也可有效降低整體光纖網路佈建的成本及複雜性。
Interior penalty discontinuous Galerkin methods with implicit time-integration techniques for nonlinear parabolic equations
(2013-07-01)
Song, Lunji
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Gie, Gung-Min
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Shiue, Ming-Cheng
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應用數學系
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Department of Applied Mathematics
We prove existence and numerical stability of numerical solutions of three fully discrete interior penalty discontinuous Galerkin methods for solving nonlinear parabolic equations. Under some appropriate regularity conditions, we give the l2(H1) and l(L2) error estimates of the fully discrete symmetric interior penalty discontinuous Galerkinscheme with the implicit -schemes in time, which include backward Euler and CrankNicolson finite difference approximations. Our estimates are optimal with respect to the mesh size h. The theoretical results are confirmed by some numerical experiments. (c) 2012 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2013
A conflict-insensitive NATed roaming framework using NAToD for proxy mobile IPv4 in WLANs
(2013-07-01)
Jia, Wen-Kang
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Chen, Yaw-Chung
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資訊工程學系
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Department of Computer Science
Providing efficient mobility management in the current Internet is increasingly important due to the quick growth of wireless mobile users. The emerging Proxy Mobile IPv4 (PMIPv4) technique brings a possible solution for that purpose. Since NAT function is widely adopted in IPv4 environment nowadays because of lacking IPv4 addresses, the PMIPv4 interoperating with NAT must be considered. Unfortunately, owing to the possible conflict of private IP address, we encounter a problem in broadcasted point-to-multipoint wireless networks such as IEEE 802.11 networks. To address this issue, we proposed a novel Network Address Translation on Demand (NAToD) scheme, which can well interoperate with the PMIPv4 solution. With our scheme, single public IPv4 addresses can be shared by multiple mobile nodes in both home and foreign networks, low-latency handoff can be achieved, deployment cost can be reduced, and software upgrade can be avoided for mobile nodes in wireless LANs. Our work allows mobile users in WLAN to access Internet based on the advantages of both PMIPv4 and NAT.
代理問題、資訊揭露和資本投資現金流量敏感性
(2013-07-01)
陳俞如
;
林卓民
;
陳衍佑
;
Yu-Ju Chen
;
Cho-Min Lin
本研究旨在分析公司代理問題、資訊揭露和資本投資現金流量敏感性三者的關係。本研究證實公司代理問題會明顯提高資本投資現金流量敏感性的程度，且核心代理問題對資本投資現金流量敏感性的影響更甚於傳統代理問題。此外，本研究亦發現，公司代理問題使資本投資對現金流量敏感性提高的現象，可透過提高公司的資訊揭露水準來降低。總而言之，本文的最大貢獻是發現核心代理問題是公司資本投資現金流量敏感性的重要決定因素之一。
Modeling miniband for realistic silicon nanocrystal array
(2013-07-01)
Hu, Weiguo
;
Budiman, Mohd Fairuz
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Igarashi, Makoto
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Lee, Ming-Yi
;
Li, Yiming
Within the envelop-function framework, we developed the finite element method to calculate the minibands in the realist Silicon nanocrystal array. This method clearly reveals the miniband formation and accurately calculates the E-K dispersion relationship. In the simple 1D array, the deduced miniband structure matches well with the analytic Kronig-Penney method. More importantly, it can better simulate the 2D and 3D nanocrystal array, which avoids approximations of the quantum cubic box and the independent periodic potential of the multi-dimension Kronig-Penney method. Further, this model is utilized to calculate miniband structure of realistic 2D-array Silicon nanodisk array for guiding quantum dot solar cell design. (C) 2012 Elsevier Ltd. All rights reserved.