Browsing by Issue Date, starting with "2011-11-14"

Now showing 1 - 20 of 39848

Electric-Field-Induced Magnetization Reversal in a Ferromagnet-Multiferroic Heterostructure
(2011-11-14)
Heron, J. T.
;
Trassin, M.
;
Ashraf, K.
;
Gajek, M.
;
He, Q.
A reversal of magnetization requiring only the application of an electric field can lead to low-power spintronic devices by eliminating conventional magnetic switching methods. Here we show a nonvolatile, room temperature magnetization reversal determined by an electric field in a ferromagnet-multiferroic system. The effect is reversible and mediated by an interfacial magnetic coupling dictated by the multiferroic. Such electric-field control of a magnetoelectric device demonstrates an avenue for next-generation, low-energy consumption spintronics.
Optical joint density of states in InGaN/GaN-based multiple-quantum-well light-emitting diodes
(2011-11-15)
Wang, Yu-Shou
;
Chen, Nai-Chuan
;
Lu, Chun-Yi
;
Chen, Jenn-Fang
;
電子物理學系
The optical joint densities of states of three InGaN/GaN-based light-emitting diodes with different emission wavelengths (violet, blue and green) operated at various currents were investigated. The results indicate that the blueshift of the emission with increasing current is related to the variation in optical joint density of states. Thus, the blueshift is ascribed to the screening of the piezoelectric field by carriers. A tail at the low-energy end of the density of states, corresponding to localized states, was found, and the presence of these tails broadens the spectra of the devices. (C) 2011 Elsevier B.V. All rights reserved.
Effects of post-annealing on the structural and nanomechanical properties of Ga-doped ZnO thin films deposited on glass substrate by rf-magnetron sputtering
(2011-11-15)
Wang, Szu-Ko
;
Lin, Ting-Chun
;
Jian, Sheng-Rui
;
Juang, Jenh-Yih
;
Jang, Jason S. -C.
In this study, the effects of post-annealing on the structure, surface morphology and nanomechanical properties of ZnO thin films doped with a nominal concentration of 3 at.% Ga (ZnO:Ga) are investigated using X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM) and nanoindentation techniques. The ZnO:Ga thin films were deposited on the glass substrates at room temperature by radio frequency magnetron sputtering. Results revealed that the as-deposited ZnO:Ga thin films were polycrystalline albeit the low deposition temperature. Post-annealing carried out at 300, 400 and 500 degrees C, respectively, has resulted in progressive increase in both the average grain size and the surface roughness of the ZnO:Ga thin film, in addition to the improved thin films crystallinity. Moreover, the hardness and Young's modulus of ZnO:Ga thin films are measured by a Berkovich nanoindenter operated with the continuous contact stiffness measurements (CSM) option. The hardness and Young's modulus of ZnO:Ga thin films increased as the annealing temperature increased from 300 to 500 degrees C, with the best results being obtained at 500 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
Multiplexing method and apparatus thereof for data switching
(2011-11-15)
Wang Chung-Hsuan
;
Lee Shuenn-Gi
A multiplexing method for data switching is disclosed. In the method, a continuous data is received, and the continuous data includes a plurality of super frames, and each super frame includes a plurality of frames. These super frames are divided into a set of even super frames and a set of odd super frames. The frames included in the set of odd super frames are sorted by corresponding required bit error rate of each frame decreasingly or increasingly. The frames included in the set of even super frames are sorted by the required bit error rate of each frame increasingly or decreasingly. An encoder is used to encode these sorted super frames.
Improved Performance of InGaN/GaN Light-Emitting Diodes With Thin Intermediate Barriers
(2011-11-15)
Chen, Bo-Chun
;
Chang, Chun-Yen
;
Fu, Yi-Keng
;
Huang, Kai-Feng
;
Lu, Yu-Hsuan
In this work, the performance of blue InGaN/GaN light-emitting diodes (LEDs) with thin intermediate barriers at high injection current is investigated. From the experimental results, it is found that the performance of LEDs with intermediate 5-nm-thick barriers is improved about 15% at 200 mA, compared with the sample with unique 9-nm-thick barriers. A numerical study is executed to analyze the hole distributions in the quantum wells. From the simulated results, it is found that the hole injection efficiency can be improved at high injection current. Hence, the effective recombination of electron and hole is also enhanced at high injection current.
Adjustable optical signal delay module and method thereof
(2011-11-15)
Chen Jye hong
;
Kao Wei-Che
;
Peng Peng-Chun
;
Lin Chun-Ting
;
Wu Fang Ming
An adjustable optical signal delay module which adjusts power of an amplified spontaneous emission generated by a semiconductor optical amplifier and feeds the adjusted amplified spontaneous emission back to the semiconductor optical amplifier in a direction opposite to an optical signal being amplified by the semiconductor optical amplifier is provided. The feedback of the adjusted amplified spontaneous emission varies a group refractive index of the semiconductor optical amplifier and delays the transmission of an optical signal through the semiconductor optical amplifier. By that arrangement, the adjustable optical delay module obviates the need for the pump laser conventionally required by a coherent population oscillation mechanism. The feedback optical loop includes a variable optical attenuator, an optical filter, and optical circulators. A user can control the delay timing of optical signals via adjusting optical power in the feedback optical loop.
Role of the N-related localized states in the electron emission properties of a GaAsN quantum well
(2011-11-15)
Hsieh, Meng-Chien
;
Wang, Jia-Feng
;
Wang, Yu-Shou
;
Yang, Cheng-Hong
;
Chen, Ross C. C.
This study elucidates the influence of the N-related localized states on electron emission properties of a GaAsN quantum well (QW) that is grown by molecular beam epitaxy. The N-related localized states in a GaAsN QW are identified as both optical and electrical electron trap states. Furthermore, exactly how N-related localized states influence the electron emission properties of a GaAsN quantum well is examined. The presence of N-related localized states effectively suppresses the tunneling emission of GaAsN QW electron states, leading to a long electron emission time for the GaAsN QW electron states. Thermal annealing can reduce the number of N-related localized states, resulting in a recovery of the tunneling emission for GaAsN QW electron states. Increasing the annealing temperature can restore the electron emission behavior of GaAsN QW to the typical electron tunneling emission for a high-quality QW. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3663436]
Modulation device for generating optical signal with quadruple frequency and method thereof
(2011-11-15)
Chen Jye Hong
;
Lin Chun-Ting
;
Shih Po Tsung
;
Peng Peng-Chun
;
Dai Sheng Peng
The present invention discloses a modulation device for generating an optical signal with quadruple frequency and the modulation method thereof. The modulation device in the present invention utilizes a commercial integrated modulator, a RF signal generator and a phase shifter to generate an optical signal with quadruple frequency. When the RF signal generator generates a first modulation signal, and the phase shifter shifts the first modulation signal by 90 degrees to generate a second modulation signal, the integrated modulator is biased to transmit the optical signal in maximum value and to modulate the first and second modulation signal so as to generate a output optical signal with quadruple frequency.
POPISK: T-cell reactivity prediction using support vector machines and string kernels
(2011-11-15)
Tung, Chun-Wei
;
Ziehm, Matthias
;
Kaemper, Andreas
;
Kohlbacher, Oliver
;
Ho, Shinn-Ying
Background: Accurate prediction of peptide immunogenicity and characterization of relation between peptide sequences and peptide immunogenicity will be greatly helpful for vaccine designs and understanding of the immune system. In contrast to the prediction of antigen processing and presentation pathway, the prediction of subsequent T-cell reactivity is a much harder topic. Previous studies of identifying T-cell receptor (TCR) recognition positions were based on small-scale analyses using only a few peptides and concluded different recognition positions such as positions 4, 6 and 8 of peptides with length 9. Large-scale analyses are necessary to better characterize the effect of peptide sequence variations on T-cell reactivity and design predictors of a peptide's T-cell reactivity (and thus immunogenicity). The identification and characterization of important positions influencing T-cell reactivity will provide insights into the underlying mechanism of immunogenicity. Results: This work establishes a large dataset by collecting immunogenicity data from three major immunology databases. In order to consider the effect of MHC restriction, peptides are classified by their associated MHC alleles. Subsequently, a computational method (named POPISK) using support vector machine with a weighted degree string kernel is proposed to predict T-cell reactivity and identify important recognition positions. POPISK yields a mean 10-fold cross-validation accuracy of 68% in predicting T-cell reactivity of HLA-A2-binding peptides. POPISK is capable of predicting immunogenicity with scores that can also correctly predict the change in T-cell reactivity related to point mutations in epitopes reported in previous studies using crystal structures. Thorough analyses of the prediction results identify the important positions 4, 6, 8 and 9, and yield insights into the molecular basis for TCR recognition. Finally, we relate this finding to physicochemical properties and structural features of the MHC-peptide-TCR interaction. Conclusions: A computational method POPISK is proposed to predict immunogenicity with scores which are useful for predicting immunogenicity changes made by single-residue modifications. The web server of POPISK is freely available at http://iclab.life.nctu.edu.tw/POPISK.
雙正回授壓控震盪器
(2011-11-16)
黃祖德
;
吳重雨
一種雙正回授壓控震盪器，包括一震盪電路及一交叉耦合對電路。震盪電路包括第一電晶體、第二電晶體、一電感及複數電容，第一電晶體及第二電晶體之閘極端相對並且分別耦接電感之兩端，其中電感及電容組成電感電容共振腔。交叉耦合對電路包括第三電晶體及第四電晶體，第三電晶體及第四電晶體之閘極端以交叉方式耦接電感之兩端，使得第三電晶體之閘極端耦接第二電晶體之閘極端，第四電晶體之閘極端耦接第一電晶體之閘極端，並且第三電晶體之汲極端耦接第一電晶體之源極端，第四電晶體之汲極端耦接第二電晶體之源極端。
感測裝置
(2011-11-16)
鄭泗東
;
周伯謙
;
林育丞
一種感測裝置，包括基座、柱體、桿件、感測元件及驅動模組。基座具有承載面且適於承載物件於承載面上。柱體配置於承載面上。桿件具有兩端點及位於兩端點之間的樞接部。樞接部沿實質上平行於承載面的軸線樞接於柱體。感測元件配置於桿件上而位於一端點與樞接部之間。感測元件位於基座與物件之間。驅動模組配置於桿件與基座之間。驅動模組驅動桿件沿軸線相對柱體樞轉，感測元件隨著桿件的樞轉而移近或移離物件。
Incorporating Evolutionary Information and Functional Domains for Identifying RNA Splicing Factors in Humans
(2011-11-16)
Hsu, Justin Bo-Kai
;
Bretana, Neil Arvin
;
Lee, Tzong-Yi
;
Huang, Hsien-Da
;
生物科技學系
Regulation of pre-mRNA splicing is achieved through the interaction of RNA sequence elements and a variety of RNA-splicing related proteins (splicing factors). The splicing machinery in humans is not yet fully elucidated, partly because splicing factors in humans have not been exhaustively identified. Furthermore, experimental methods for splicing factor identification are time-consuming and lab-intensive. Although many computational methods have been proposed for the identification of RNA-binding proteins, there exists no development that focuses on the identification of RNA-splicing related proteins so far. Therefore, we are motivated to design a method that focuses on the identification of human splicing factors using experimentally verified splicing factors. The investigation of amino acid composition reveals that there are remarkable differences between splicing factors and non-splicing proteins. A support vector machine (SVM) is utilized to construct a predictive model, and the five-fold cross-validation evaluation indicates that the SVM model trained with amino acid composition could provide a promising accuracy (80.22%). Another basic feature, amino acid dipeptide composition, is also examined to yield a similar predictive performance to amino acid composition. In addition, this work presents that the incorporation of evolutionary information and domain information could improve the predictive performance. The constructed models have been demonstrated to effectively classify (73.65% accuracy) an independent data set of human splicing factors. The result of independent testing indicates that in silico identification could be a feasible means of conducting preliminary analyses of splicing factors and significantly reducing the number of potential targets that require further in vivo or in vitro confirmation.
《大師與瑪格麗特》與俄國魔幻寫實主義
(2011-11-16)
鄢定嘉
;
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。
考量元件與佈線對稱之類比佈局方法
(2011-11-16)
江蕙如
;
楊喻名
本發明提供一種考量元件與佈線對稱之類比佈局方法，其對一電路進行佈局，電路由具有一組元件及其連接線的一網路表所描述，首先輸入網路表，網路表的每一元件具有一設計限制並對應至一優先次序；再依據優先次序對每一元件進行排序，以建立一限制庫；又依據每一元件的設計限制及對應的優先次序，建立一階層式限制樹；依據階層式限制樹對每一元件進行元件擺置，每一元件的可能形狀係使用形狀曲線表示；再對於元件的每一擺置計算相對應的花費函數，並依據花費函數選取元件的最佳擺置；對每一連接線建立直線式史坦納最小樹；最後執行類比繞線。
WALKING ASSISTIVE SYSTEM
(2011-11-17)
SONG KAI-TAI
;
JIANG SIN-YI
;
HUANG KO-TUNG
The present invention discloses a walking assistive system comprising a motion module, a current detecting module and a central control module. Each motion module includes omni-directional wheels, motors, shaft encoders and servo controllers. The omni-directional wheels are connected to and driven by the motors. The motors are connected to the shaft encoders, and the rotation speed values are generated corresponds to the rotation speed of the motors by the shaft coder. The servo controllers connected to the shaft encoders and the motors receive the rotation speed values and control the motors. The current detecting modules connected to the motors detect the current of the motors and generate current values correspondingly. The central control module connected to the motion control module and the current detecting module controls the platform compliant motion control modules according to the rotation speed values and the current values.
電哪吒　尋找內心平靜之音
(2011-11-20)
林冠儀
;
Department of Communication and Technology
;
傳播與科技學系
一個在廟宇成長的陣頭囝仔，如何用電音征服夢想？《電哪吒》是留美新銳導演李運傑以台灣特有的廟宇文化為出發點的新作，勾勒遠大的夢想與獨樹一格的台灣電音風格，帶領觀眾尋找讓內心平靜的聲音。
速食進餐廳　校園熱議
(2011-11-20)
賴映秀
;
Department of Communication and Technology
;
傳播與科技學系
新竹清華大學校內餐廳進駐跨國連鎖速食餐聽，引發餐廳承包商與學生民意的衝突。
新舊並陳　百年都市波士頓
(2011-11-20)
胡乃文
;
Department of Communication and Technology
;
傳播與科技學系
身為美國最古老的城市之一，波士頓不僅散發了濃厚的人文氣息，也擁有許多極具歷史意義的建築。走在波士頓的古老街道上，試著傾聽這座訴說百年故事的城市，並呼吸著不一樣的空氣。
這輩子最眷戀的地方
(2011-11-20)
林筱娟
;
Department of Communication and Technology
;
傳播與科技學系
中科國民小學，我這輩子最眷戀、最想回去的地方。
青春期告別派對　溫柔登場
(2011-11-20)
陳琦
;
Department of Communication and Technology
;
傳播與科技學系
為了讚頌一生只有一次，即將逝去的青春期，每個人都會在自己世界的周圍，築起一座座高牆，在裡面辦一場給自己的派對，然後選一些歌，讓深陷回憶的自己不孤單。