Browsing by Issue Date, starting with "2012-06-12"

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Electrical Control of Multiferroic Orderings in Mixed-Phase BiFeO3 Films
(2012-06-12)
Chen, Yi-Chun
;
He, Qing
;
Chu, Feng-Nan
;
Huang, Yen-Chin
;
Chen, Jhih-Wei
Gray code encoding and decoding method applied to holographic storage devices
(2012-06-12)
Ou-Yang Mang
;
Chen Yu-Ta
;
Sun Ching-Cherng
;
Yang Tsung-Hsun
A gray code encoding and decoding method applied to holographic storage devices is proposed. The encoding method uses gray levels of a 2D detector to encode a certain amount of original bits of the original data, and then sends them to a spatial light modulator (SLM) for encryption. The decoding method corrects the received gray levels to the original gray levels, and then compares the maximum gray level with the original gray levels to decode the original gray level into binary data. The proposed encoding and decoding method can better make use of storage locations of the 2D detector and get a code rate close to 1.
Preservation of Photoluminescence Efficiency in the Ordered phases of Poly(2,3-diphenyl-1,4-phenylenevinylene) via Disturbing the Intermolecular pi-pi Interactions with Dendritic Aliphatic Side Chains
(2012-06-12)
Wu, Yu-Chun
;
Ren, Xiang-Kui
;
Chen, Er-Qiang
;
Lee, Hsun-Mei
;
Duvail, Jean-Luc
To understand the relation between the solid-state phase structures and the photophysical properties of poly(2,3-diphenyl-1,4-phenylenevinylene) (DP-PPV) derivatives, three DP-PPV derivatives, P1-P3, were designed, synthesized via Gilch polymerization and characterized. Among the polymers, PI is a reported highly emissive poly(2,3-diphenyl-5-hexyl-p-phenylenevinylene), and P2 and P3 are novel DP-PPV derivatives, which are purposely designed to bear hydrophobic and hydrophilic Percec-type dendrons as side chains. The bulkiness and hydrophobic hydrophilic natures of the side chains show strong effects on photophysical properties of the polymers. The solutions and as-casted films of P1-F3 all show remarkably high photoluminescence (PL) efficiency (Phi(PL)) (>80% in chloroform solution, and >63% for the as-casted films). However, Phi(PL) of P1 and P3 decrease significantly to 30% after cooled their polymer melts to room temperature. Through the phase behavior analysis by differential scanning calorimetry (DSC), and phase structure analysis by wide-angle X-ray diffraction (WAXD), the decrease of Phi(PL) can be elucidated and attributed to the ordering of the solid-state structures of PI and P3. To our surprise, Phi(PL) of P2 is preserved even in an ordered solid-state phase, and it is insensitive to the structural ordering. Structural analysis of P2 revealed that the aliphatic dendritic side chains of P2 effectively disturbing the intermolecular pi-pi interactions among the conjugated backbones, which allows the preservation of Phi(PL) in the environment with ordered packing of DP-PPV molecules. The results of time-resolved PL decay experiments also confirmed that P2 possesses long-lived decay time because of excitons confined more effectively for emissive relaxation.
馬勒《第九交響曲》與世紀末維也納：聆聽、記憶、救贖
(2012-06-13)
金立群
;
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。
Phosphors and Light-Emitting Devices Using the Same
(2012-06-14)
CHEN Teng-Ming
;
Kuo Te-Wen
The present invention relates to novel phosphors, which are represented by a formula of (A1-xMx)8D12O24S2, wherein x, A, M and D are defined the same as the specification. In addition, the present invention further provides a light-emitting device using the above novel phosphors.
PROJECTION APPARATUS
(2012-06-14)
Lin Yi-Hsin
;
Lin Hung-Chun
A projection apparatus including an illumination system, a light valve, and an imaging system is provided. The illumination system is for emitting an illumination beam. The light valve is disposed on a transmission path of the illumination beam for converting the illumination beam into an image beam. The imaging system includes a projection lens and an electrically tunable focusing lens. The projection lens is disposed on the transmission path of the image beam. The electrically tunable focusing lens is disposed on the transmission path of the image beam. The electrically tunable focusing lens changes a focal length thereof by electricity but not by a mechanism moving positions of lenses.
ELECTROSTATIC DISCHARGE PROTECTION DEVICE
(2012-06-14)
HUANG Yeh-Jen
;
Jou Yeh-Ning
;
Ker Ming-Dou
;
Chen Wen-Yi
;
Hung Chia-Wei
An electrostatic discharge (ESD) protection device including a substrate, a first doped region, a second doped region, and a third doped region, a gate and a plurality of contacts is disclosed. The substrate includes a first conductive type. The first doped region is formed in the substrate and includes a second conductive type. The second doped region is formed in the substrate and includes the second conductive type. The third doped region is formed in the substrate, includes the first conductive type and is located between the first and the second doped regions. The gate is formed on the substrate, located between the first and the second doped regions and comprises a first through hole. The contacts pass through the first through hole to contact with the third doped region.
MICROPHONE ARRAY STRUCTURE ABLE TO REDUCE NOISE AND IMPROVE SPEECH QUALITY AND METHOD THEREOF
(2012-06-14)
BAI Mingsian R.
;
CHEN Chun-Hung
The present invention discloses a microphone array structure able to reduce noise and improve speech quality and a method thereof. The method of the present invention comprises steps: using at least two microphone to receive at least two microphone signals each containing a noise signal and a speech signal; using FFT modules to transform the microphone signals into frequency-domain signals; calculating an included angle between a speech signal and a noise signal of the microphone signal, and selecting a phase difference estimation algorithm, a noise reduction algorithm or both to reduce noise according to the included angle; if the phase difference estimation algorithm is used, calculating phase difference of the microphone signals to obtain a time-space domain mask signal; and multiplying the mask signal and the average of the microphone signals to obtain the speech signals of the microphone signals. Thereby is eliminated noise and improve speech quality.
A novel design of wafer yield model for semiconductor using a GMDH polynomial and principal component analysis
(2012-06-15)
Lin, Jun-Shuw
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
According to previous studies, the Poisson model and negative binomial model could not accurately estimate the wafer yield. Numerous mathematical models proposed in past years were very complicated. Furthermore, other neural networks models can not provide a certain equation for managers to use. Thus, a novel design of this paper is to construct a new wafer yield model with a handy polynomial by using group method of data handling (GMDH). In addition to defect cluster index (CIM), 12 critical electrical test parameters are also considered simultaneously. Because the number of input variables for GMDH is inadvisable to be too many, principal component analysis (PCA) is used to reduce the dimensions of 12 critical electrical test parameters to a manageable few without much loss of information. The proposed approach is validated by a case obtained in a DRAM company in Taiwan. (C) 2011 Elsevier Ltd. All rights reserved.
Modeling volatilization of residual VOCs in unsaturated zones: A moving boundary problem
(2012-06-15)
Abbas, Talib R.
;
Yu, Jung-Hau
;
Fen, Chiu-Shia
;
Yeh, Hund-Der
;
Yeh, Li-Ming
It is of practical interest to investigate the natural evaporation of volatile organic compounds (VOCs) after the removal of a leaking tank situated on the top of the soil. This study aims to develop a mathematical model to predict mole fraction distributions and migration of evaporation front for two VOCs emanating from residual non-aqueous phase liquid (NAPL) due to the leak from the tank in a homogeneous soil. Considering the location of the front and the regions above and below the front, a numerical model for the diffusive transport of VOCs in unsaturated soils was developed using the finite difference method with a moving grid approach. The model was further simplified to the case of single VOC and solved analytically by Boltzmann's transformation with a moving boundary. Analytical expressions for the depth and moving speed of the front for a single VOC were then obtained for practical use. Finally, the developed model was used to predict the concentration distributions of VOCs below the land surface and examine the factors affecting the location and moving speed of the evaporation front. (C) 2012 Elsevier B.V. All rights reserved.
Global bifurcation and exact multiplicity of positive solutions for a positone problem with cubic nonlinearity
(2012-06-15)
Tzeng, Chih-Chun
;
Hung, Kuo-Chih
;
Wang, Shin-Hwa
;
應用數學系
;
Department of Applied Mathematics
We study the global bifurcation and exact multiplicity of positive solutions of {u'' (chi) + lambda f(epsilon)(u) = 0, -1 < chi < 1, u(-1) = u(1) = 0, f epsilon(u) = -epsilon u(3) + sigma u(2) - kappa u + rho, where lambda, epsilon > 0 are two bifurcation parameters, and sigma, rho > 0, 0 < kappa <= root sigma rho are constants. We prove the global bifurcation of bifurcation curves for varying epsilon > 0. More precisely, there exists (epsilon) over tilde > 0 such that, on the (lambda, parallel to u parallel to infinity)-plane, the bifurcation curve is S-shaped for 0 < epsilon < (epsilon) over tilde and is monotone increasing for epsilon >= (epsilon) over tilde. Thus we are able to determine the exact number of positive solutions by the values of epsilon and lambda. Our results extend those of Hung and Wang (K.-C. Hung, S.-H. Wang, Global bifurcation and exact multiplicity of positive solutions for a positone problem with cubic nonlinearity and their applications, Trans. Amer. Math. Soc., in press) from kappa <= 0 to kappa <= root sigma rho. (C) 2012 Elsevier Inc. All rights reserved.
Characterizations on the amidized multiwalled carbon nanotubes grafted with polyaniline via in situ polymerization
(2012-06-15)
Wu, Yi-Jhen
;
Chao, Liang
;
Ho, Ko-Shan
;
Huang, Ying-Jie
;
Huang, Yu-Lan
A multiwalled carbon nanotubes (MWCNTs) were carboxylated after refluxing with sulfuric and nitric acids. These attached carboxylic acid groups were further condensated with o-phenylene diamine into amide catalyzed by dicyclohexyl carbodiimide (DCC). The obtained amidized MWCNTs were in situ-polymerized with aniline monomers to graft a conducting polyaniline (PANI) onto MWCNT (ES-g-MWCNTs) through the polymerization occurring in the ortho- and meta-positions. The reduced conductivity of the MWCNT after carboxylation can be recovered after grafting with PANI, which owns a strong ?max at the near infrared region due to the extended conjugation from MWCNTs to PANI. Transmission electronic microscopic pictures show a gradual broadening of the MWCNT diameter after carboxylation, amidization, and polymerization. The weight loss from the thermogravimetric thermograms due to the carboxylations of MWCNTs, amidized MWCNTs, and the PANI grafted MWCNTs into CO2 can be used to estimate the degree of carboxylation, amidization, and grafting of PANI. The degree of carboxylation of MWCNT calculated from ESCA spectrum is around 23% close to that estimated from TGA thermogram. The doping level of redoped PANI-grafted MWCNT is found to be 27.78% much less than the maximum 50% of neat PANI. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Numerical Study of (0001) Face GaN/InGaN p-i-n Solar Cell With Compositional Grading Configuration
(2012-06-15)
Kuo, Yen-Kuang
;
Lin, Bing-Cheng
;
Chang, Jih-Yuan
;
Chen, Fang-Ming
;
Kuo, Hao-Chung
The advantages of a (0001) face GaN/InGaN p-i-n solar cell with compositional grading configuration between i-InGaN/p-GaN layers are studied numerically. With the use of the grading layer, the conversion efficiency is markedly promoted due to the reduction of potential barrier height for holes and due to the decrease of polarization. Optimized conversion efficiency is obtained when the thickness of the grading layer increases to a critical value. This critical thickness is strongly influenced by the polarization charges and doping concentration of the grading layer. When the density of the polarization charges is high or the doping concentration is low, a thick grading layer is required to achieve high efficiency.
Effects of the PdO nanoflake support on electrocatalytic activity of Pt nanoparticles toward methanol oxidation in acidic solutions
(2012-06-15)
Chen, Chung-Shou
;
Pan, Fu-Ming
;
材料科學與工程學系
;
Department of Materials Science and Engineering
We prepared PdO nanoflake thin films on carbon cloths by reactive sputtering deposition, and studied electrocatalytic performance of Pt nanoparticles electrodeposited on the PdO thin film in methanol oxidation reaction (MOR) in acidic media. The PdO nanoflake thin film exhibits a cyclic voltamperometric (CV) behavior similar to metallic Pd electrodes because a metallic Pd surface layer is formed on the PdO thin film electrode under the CV measurement condition. The nanoflake morphology of the PdO electrode provides a large surface area for Pt nanoparticle loading, resulting in a large electrochemical active surface area (ESA). The Pt/PdO electrode has a high electrocatalytic activity toward MOR, and the good electrocatalytic performance of the Pt/PdO electrode is ascribed to a high CO tolerance and the large ESA. We suggest that the high CO tolerance of the catalyst on the Pt/PdO electrode is a result of the synergism of the bifunctional mechanism and the electronic effect. XPS analyses indicate that negative charge transfer occurs from the PdO support to the Pt nanoparticles, indicating the presence of the electronic effect. Pt nanoparticles on the PdO support can greatly alleviate the nanoflake damage during the CV measurement, which results from anodic dissolution of metal Pd from the PdO support in acidic media. (C) 2012 Elsevier B.V. All rights reserved.
A study of phase transition behaviors of chalcogenide layers using in situ alternative-current impedance spectroscopy
(2012-06-15)
Huang, Yin-Hsien
;
Huang, Yu-Jen
;
Hsieh, Tsung-Eong
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Electrical properties of chalcogenide thin films, both pristine Ge2Sb2Te5 (GST) and cerium-doped GST, were investigated by in situ alternative-current (AC) impedance spectroscopy. With the aid of brick-layer model and nano-grain composite model, the roles of grain and grain-boundary on the phase transition of chalcogenides were distinguished and the dominance of grain boundary was observed. Tangent loss behaviors deduced by impedance analysis revealed alien-element doping alters the interfacial polarization and delays the phase-transition rate of GST. Analytical results also illustrated that the in situ AC impedance spectroscopy can be an alternative tool for characterizing the phase-change kinetics of chalcogenides thin films with nano-scale grain sizes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729528]
Synthesis and characterization of sulfonated polytriazole-clay proton exchange membrane by in situ polymerization and click reaction for direct methanol fuel cells
(2012-06-15)
Huang, Yao-Jheng
;
Ye, Yun-Sheng
;
Syu, Yu-Jyuan
;
Hwang, Bing-Joe
;
Chang, Feng-Chih
Sulfonated polytriazole-clay (SFTA-clay) nanocomposites are successfully prepared by in situ polymerization of SPTA using click chemistry in the presence of propargyl-functionality modified clay. The clay layers are exfoliated and well dispersed within the SPTA matrix resulting in improvements in thermal stability, mechanical strength, methanol permeability, water retention, ion channel size, and ionic cluster distribution. The SPTA-clay nanocomposite membranes with small amounts of clay in the SPTA matrices possess higher selectivity's; defined as the ratio of proton conductivity to methanol permeability, and thus have potential as proton exchange membranes (PEMs) in direct methanol fuel cells (DMFCs). (C) 2012 Elsevier B.V. All rights reserved.
Applying hierarchical grey relation clustering analysis to geographical information systems - A case study of the hospitals in Taipei City
(2012-06-15)
Wu, Wen-Hsiang
;
Lin, Chin-Tsai
;
Peng, Kua-Hsin
;
Huang, Chiu-Chin
;
管理科學系
Deng proposed grey clustering analysis (GCA) in 1987. Later, Jin presented a new method in 1993, called grey relational clustering (GRC) method that combined grey relational analysis with clustering. However, the CRC method cannot use a tree diagram to make appropriate classification decisions without re-computation. This study thus attempts to combine CRC and hierarchical clustering analysis. Given the existence of an excess of medical resources in the Taipei area, this study attempts to understand the degree of concentration of medical resources in this area. Specifically, this study applies a geographical information system (GIS) to present the geographical distribution of hospitals in Taipei. Additionally, a new-type of cluster analysis, known as hierarchical grey relation clustering analysis, is used to analyze the distribution of hospitals and understand how they compete with one another. The analytical results demonstrate that hierarchical grey relation clustering analysis is a suitable method of analyzing geographical position. Tree diagrams can help policymakers make appropriate classification decisions without re-computation. The study results can inform hospitals of their competitors and help them to develop appropriate responses. Additionally, the analytical results can also provide a reference to government or hospital policymakers to help them position hospitals in areas, thus achieving a better distribution of medical resources in Taipei. (C) 2012 Elsevier Ltd. All rights reserved.
液晶透鏡結構及其驅動方法
(2012-06-16)
林怡欣
;
林弘峻
本發明係揭露一種液晶透鏡結構及其驅動方法,此液晶透鏡結構包含上基板、下基板、液晶及高分子複合薄膜及液晶層。上基板具有第一導電層和第一配向層。下基板具有第二導電層和第二配向層。液晶及高分子複合薄膜設置於第一配向層之一側,並形成第一透鏡。液晶層設置於液晶及高分子複合薄膜和第二配向層之間,並形成第二透鏡。藉由內建液晶及高分子複合薄膜,以實現低電壓及大對焦範圍之液晶透鏡。
螢光材料及使用其之發光裝置
(2012-06-16)
陳登銘
;
郭德文
本發明係有關於一種新穎螢光材料，其化學式如下：(A1-xMx)8D12O24S2，其中，x、A、M及D定義如說明書中所述。此外，本發明更提供使用上述新穎螢光材料之發光裝置。
靜電放電防護裝置
(2012-06-16)
黃曄仁
;
周業甯
;
柯明道
;
陳穩義
;
洪嘉偉
一種靜電放電防護裝置包括,一基底、一第一摻雜區、一第二摻雜區、一第三摻雜區、一閘極以及複數第一金屬接觸窗。基底具有一第一導電型態。第一摻雜區形成在基底之中,並具有一第二導電型態。第二摻雜區形成在基底之中,並具有第二導電型態。第三摻雜區形成在基底之中,具有第一導電型態,並位於第一及第二摻雜區之間。閘極形成在基底之上,並位於第一及第二摻雜區之間。閘極具有一第一開口。第一金屬接觸窗穿過第一開口,接觸第三摻雜區。