Browsing by Issue Date, starting with "2011-10-13"

Now showing 1 - 20 of 40146

Collinear Holographic Storage Medium
(2011-10-13)
SUN Ching-Cherng
;
YU Yeh-Wei
In the specification and drawings, a collinear holographic storage medium is described and shown with a recording layer, wherein the lateral linear thermal expansion coefficient of the recording layer is substantially the same as the linear thermal expansion coefficient of the material of the recording layer.
METHOD FOR EMBEDDING SECRET MESSAGE INTO PNG IMAGE
(2011-10-13)
LEE CHE WEI
;
TSAI WEN-HSIANG
A method for embedding a secret message into a PNG image comprises steps: converting a secret message into a plurality of secret codes; converting the secret codes into a plurality of secret shares; using a mapping process to modify values of the secret shares to approach a full-transparent value of an alpha channel of a PNG image, and sequentially embedding the mapped secret shares into the alpha channel. As the secret shares with high-transparent values, they leave the RGB channels untouched. Thus, embedding the secret shares into the PNG image does not make difference in the appearances between the secret-carrying image and the original PNG image. Therefore, the present invention can transmit secret message securely and realize covert communication.
Lattice Dynamics and Crystalline Properties of Wurtzite Zn(1-x)Mg(x)O Powders under High Pressure
(2011-10-13)
Lin, Y. C.
;
Tseng, C. L.
;
Chou, W. C.
;
Chia, C. H.
;
Han, T. C.
This investigation systematically studies the lattice dynamics and crystalline properties in Zn(1-x)Mg(x)O using high-pressure Raman spectroscopy. The incorporation of Mg and the application of external pressure cause distinct phonon vibrational behaviors in ZnO. Accordingly, the 202.7, 332.7, and 511.5 cm(-1) phonons, which have been controversially assigned, can be conclusively identified. Detailed Raman spectra reveal that the metallic phase transition of ZnO is complete by around 13.2 GPa, which pressure is found to decrease as the Mg content increases. Upon pressure release, an unusual hysteresis effect (>10.0 GPa) in Zn(1-x)Mg(x)O is observed. The degree of crystal ionicity and anisotropy importantly affects the phase transition pressure of Zn(1-x)Mg(x)O. Under ambient conditions, ZnO becomes more ionic upon the incorporation of Mg and becomes more covalent under higher pressure. These results are caused by the interplay between the pressure dependence of the high-frequency dielectric constant and Born's transverse dynamical effective charge. The E(1)-A(1) splitting of the longitudinal and transverse optical phonons is analyzed, yielding insight into the pressure-dependent crystal anisotropy of Zn(1-x)Mg(x)O.
Reading Device
(2011-10-13)
SUN Ching-Cherng
;
YU Yeh-Wei
A reading device includes a spatial light modulator, a zoom lens set, an object lens, an image sensor, and an adjusting module. The spatial light modulator provides a reading beam. The zoom lens set forms the reading beam into a real image. The object lens focuses the real image onto a collinear holographic storage medium and thus produces a diffraction signal. The image sensor converts the diffraction signal into an electric signal. The adjusting module adjusts the optical magnification of the zoom lens set according to the quality of the diffraction signal.
Lattice Dynamics and Crystalline Properties of Wurtzite Zn1-xMgxO Powders under High Pressure
(2011-10-13)
Lin, Y. C.
;
Tseng, C. L.
;
Chou, W. C.
;
Chia, C. H.
;
Han, T. C.
This investigation systematically studies the lattice dynamics and crystalline properties in Zn1-xMgxO using high-pressure Raman spectroscopy. The incorporation of Mg and the application of external pressure cause distinct phonon vibrational behaviors in ZnO. Accordingly, the 202.7, 332.7, and 511.5 cm(-1) phonons, which have been controversially assigned, can be conclusively identified. Detailed Raman spectra reveal that the metallic phase transition of ZnO is complete by around 13.2 GPa, which pressure is found to decrease as the Mg content increases. Upon pressure release, an unusual hysteresis effect (>10.0 GPa) in Zn1-xMgxO is observed. The degree of crystal ionicity and anisotropy importantly affects the phase transition pressure of Zn1-xMgxO. Under ambient conditions, ZnO becomes more ionic upon the incorporation of Mg and becomes more covalent under higher pressure. These results are caused by the interplay between the pressure dependence of the high-frequency dielectric constant and Born's transverse dynamical effective charge. The E-1-A(1) splitting of the longitudinal and transverse optical phonons is analyzed, yielding insight into the pressure-dependent crystal anisotropy of Zn1-xMgxO.
Improvement on the long-term stability of flexible plastic dye-sensitized solar cells
(2011-10-15)
Lee, Kun-Mu
;
Chiu, Wei-Hao
;
Lu, Ming-De
;
Hsieh, Wen-Feng
;
光電工程學系
We investigate the long-term stability of performance for plastic dye-sensitized solar cells (DSSCs) based on organic iodides (TBAI or PMII) in methoxypropionitrile-based electrolytes. Plastic DSSCs containing TBAI maintain 96.9% of baseline efficiency under more than 1000 h prolonged one sun light irradiation and thermal stress (60 degrees C) aging. The factors of device long-term stability, such as the effects of organic iodides, cell-sealing conditions, and the sheet resistance of indium tin oxide coated polyethylene naphthalate substrate (ITO/PEN) are discussed via using electrochemical impedance spectroscopy and electrical resistance measurement. (C) 2011 Elsevier B.V. All rights reserved.
Hydrogen etching of GaN and its application to produce free-standing GaN thick films
(2011-10-15)
Yeh, Yen-Hsien
;
Chen, Kuei-Ming
;
Wu, Yin-Hao
;
Hsu, Ying-Chia
;
Yu, Tzu-Yi
This work investigates the morphology of GaN etched in hydrogen (H(2)) at different temperatures, the activation energies of the rate-limiting steps of H(2) etching, and the overgrowth on a H(2)-etched GaN template. The surfaces of GaN have different profiles after being etched in H(2); they resemble a plane decorated with columns and mooring posts in a low-temperature etching condition, and with deep cavities in a high-temperature etching condition. The etched profiles show that H(2) etching has controllable etching directions: vertical and lateral. In a low-temperature condition, H(2) etching has both vertical and lateral etching directions; however, in a high-temperature condition, it has only the vertical etching direction. The activation energies of the rate-limiting steps under etching pressures of 100 and 700 Torr are estimated to be 3.22 and 3.77 eV, respectively. A thick GaN layer has been grown on a H2-etched GaN template, and it has self-separated from the underlying sapphire substrate. (C) 2011 Elsevier B.V. All rights reserved.
Effects of rapid thermal annealing on the structural properties of TiO(2) nanotubes
(2011-10-15)
Lin, J. Y.
;
Chou, Y. T.
;
Shen, J. L.
;
Yang, M. D.
;
Wu, C. H.
The structural properties of TiO(2) nanotubes with rapid thermal annealing (RTA) and traditional thermal annealing in O(2) were studied by X-ray diffraction (XRD) and Raman scattering measurements. From analyzing the line width of XRD and the correlation length of the Raman peak, we demonstrate that RTA can be an effective tool for amorphous-anatase transformation in TiO(2) nanotubes. The Raman peak redshifts and reduces its line width after thermal annealing and RTA, which may involves the reduction of oxygen-related defects. (C) 2011 Elsevier B. V. All rights reserved.
Effects of rapid thermal annealing on the structural properties of TiO2 nanotubes
(2011-10-15)
Lin, J. Y.
;
Chou, Y. T.
;
Shen, J. L.
;
Yang, M. D.
;
Wu, C. H.
The structural properties of TiO2 nanotubes with rapid thermal annealing (RTA) and traditional thermal annealing in O-2 were studied by X-ray diffraction (XRD) and Raman scattering measurements. From analyzing the line width of XRD and the correlation length of the Raman peak, we demonstrate that RTA can be an effective tool for amorphous-anatase transformation in TiO2 nanotubes. The Raman peak redshifts and reduces its line width after thermal annealing and RTA, which may involves the reduction of oxygen-related defects. (C) 2011 Elsevier B. V. All rights reserved.
Electrochemical degradation of Nafion ionomer to functionalize carbon support for methanol electro-oxidation
(2011-10-15)
Hsieh, Yu-Chi
;
Chen, Jing-Yu
;
Wu, Pu-Wei
;
材料科學與工程學系
;
Department of Materials Science and Engineering
An effective electrochemical route to produce functional groups on carbon surface is demonstrated. Cyclic voltammetric (CV) sweeps are performed in 0.5 M H(2)SO(4) electrolyte on electrodes containing carbon cloth, Vulcan XC72R, and Nation ionomer. With supply of ambient oxygen, the generation of hydroxyl radicals from the oxygen reduction reaction during CV cycles initiates the decomposition of Nation ionomer that leads to formation of oxygenated functional groups on the carbon surface. Ion chromatography confirms the dissolution of sulfate anions upon CV scans. Raman analysis suggests a minor alteration for the carbon structure. However, X-ray photoelectron spectroscopy indicates a significant increase of oxygenated functional groups in conjunction with notable reduction in the fluorine content. The amount of the oxygenated functional groups is determined by curve fitting of C is spectra with known constituents. These functional groups can also be found by immersing the as-prepared electrode in a solution containing concentrated residues from Nation ionomer decomposition. The functionalized electrode allows a 170% increment of Pt ion adsorption as compared to the reference sample. After electrochemical reductions, the functionalized electrode reveals significant improvements in electrocatalytic abilities for methanol oxidation, which is attributed to the oxygenated functional groups that facilitates the oxidation of CO on Pt. (C) 2011 Elsevier B.V. All rights reserved.
獵人足跡　泰雅風情
(2011-10-16)
林儀
;
Department of Communication and Technology
;
傳播與科技學系
現代科技發達的今日，仍有許多純樸的原住民們，運用老祖先傳承下來的技術，在山上過著傳統而清靜的生活。現在，請卸下所有文明的包袱，到鹿場部落來一場真真實實的獵人之旅吧！
發光的故事　天虹戰隊小學
(2011-10-16)
江琬婷
;
Department of Communication and Technology
;
傳播與科技學系
整日大雨後的傍晚，一道完美的彩虹劃過天際，一路延伸到西邊的地平線，七道色彩在天空，繪出一個閃亮的半圓。每到這個時候，我們總會爬到樹上眺望彩虹，慕絲老師因此暱稱我們是「天虹戰隊」。
可攜式網路影像嵌入秘密訊息之方法
(2011-10-16)
李哲瑋
;
蔡文祥
本發明係揭露一種可攜式網路影像嵌入秘密訊息之方法，其係將秘密訊息轉換成秘密碎片後，嵌入於可攜式網路影像(PNG)之透明度通道，並在透明度通道上藉由數值映像(mapping)調整透明度，使得藏密後的可攜式網路影像具高透明度，不致被察覺有異。並且秘密訊息的嵌入不影響可攜式網路影像之紅綠藍通道數值，使得藏有秘密的可攜式網路影像外觀上與原圖並無差異，因而具掩護秘密訊息的效果，而達到秘密傳輸的目的。
享受　一個人的旅行
(2011-10-16)
張莉雯
;
Department of Communication and Technology
;
傳播與科技學系
電影《享受吧！一個人的旅行》改編自美國新聞記者兼小說家伊莉莎白．吉兒伯特（Elizabeth Gilbert）的同名回憶錄，訴說一個年過三十離了婚、對生活感到空虛徬徨、決定透過旅行找尋自我的女性的心路歷程。
一種在三族氮化物磊晶過程中降低缺陷產生的方法
(2011-10-16)
張翼
;
黃延儀
本發明揭露一種在三族氮化物磊晶過程中降低缺陷產生的方法，首先提供一異質基板，再以分子束磊晶法沉積形成具有平滑表面的第一層三族氮化物於該異質基板上，係可用以抑制螺旋線差排的形成；接著以分子束磊晶法沉積形成第二層三族氮化物，係可用以成為彎曲刃線差排的成長方向；最後，使用遷移促進磊晶法形成平滑的第三層三族氮化物於該第二層三族氮化物的表面，可以使該第二層三族氮化物表面的吸附原子增強擴散進行的效果，藉以修復該第二層三族氮化物的表面。
藺草心　編織多少人生歲月
(2011-10-16)
曾意倫
;
Department of Communication and Technology
;
傳播與科技學系
有多少人還記得興盛一時的大甲藺草？有多少人還記得那些付出青春歲月的編織婦女？這是一種傳統的技藝，也是一種心靈的託付，藺草編織陪伴著許陳真度過大半輩子，在逐漸凋零的藺草產業中，編織出屬於自己的故事。
你離開我　就是旅行的意義
(2011-10-16)
王升含
;
Department of Communication and Technology
;
傳播與科技學系
第一天，12/1，-16°c，連鼻涕都因為太冷而流不出來的瑞典。第二天，12/2，-23°c，怎麼有這麼可愛的樹。第三天，丹麥，哥本哈根；這裡的物價是台灣的六倍整。第四天，斯德哥爾摩。第五天，落花人獨立，微雨燕雙飛。
逆向宿命　命運操之在己
(2011-10-16)
張繼云
;
Department of Communication and Technology
;
傳播與科技學系
「命運掌握在自己的手裡」、「三分天注定，七分靠打拚」已然是些老話。有沒有那種可能，我的人生是一場騙局，無論我的所思、所想，其實早已被寫好劇本，在固定的軌道運行？
三太子出巡　世界看到台灣
(2011-10-16)
許鈺煊
;
Department of Communication and Technology
;
傳播與科技學系
背後插滿著台灣國旗的三太子，在埃及金字塔前跳著逗趣的舞步、在印度沙漠中騎著駱駝、走在肯亞貧民窟，跟小朋友開心地玩耍。這一切不合常理的畫面，令人印象深刻。三太子究竟是誰？待我們一探究竟。
震撼藝術　亞維儂少女之死
(2011-10-16)
林冠儀
;
Department of Communication and Technology
;
傳播與科技學系
每幅畫作都訴說著一個故事，〈亞維儂的少女〉是西班牙畫家畢卡索的知名作品，有誰想得到，這幅畫作背後竟然隱藏著驚人的秘密？