Browsing by Issue Date, starting with "2012-08-06"

Now showing 1 - 20 of 35757

Enhanced internal quantum efficiency in graphene/InGaN multiple-quantum-well hybrid structures
(2012-08-06)
Huang, Huei-Min
;
Chang, Chiao-Yun
;
Hsu, Yueh-Shan
;
Lu, Tien-Chang
;
Lan, Yu-Pin
The enhanced internal quantum efficiency of InGaN/GaN multiple-quantum-wells (MQWs) structure is demonstrated by paving the graphene layers on the MQWs surface. Compared to the conventional MQWs, the internal quantum efficiency of the graphene/InGaN MQWs hybrid structure exhibits a remarkable 2-fold increase. The high charge carrier density in graphene layer is accounted for the enhanced internal quantum efficiency. Moreover, the negligible photoluminescence emission peak shift with increasing the excitation power as well as the decrease of radiative recombination lifetime are attributed to the reduced quantum-confined Stark effect, which correlates to the screening of the polarization field in the c-plane nitride-based quantum well structure. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4745211]
Solution to an open problem on 4-ordered Hamiltonian graphs
(2012-08-06)
Hsu, Lih-Hsing
;
Tan, Jimmy J. M.
;
Cheng, Eddie
;
Liptak, Laszlo
;
Lin, Cheng-Kuan
A graph G is k-ordered if for any sequence of k distinct vertices of G, there exists a cycle in G containing these k vertices in the specified order. It is k-ordered Hamiltonian if, in addition, the required cycle is Hamiltonian. The question of the existence of an infinite class of 3-regular 4-ordered Hamiltonian graphs was posed in Ng and Schultz (1997) [10]. At the time, the only known examples were K-4 and K-3.3. Some progress was made in Meszaros (2008) [9] when the Peterson graph was found to be 4-ordered and the Heawood graph was proved to be 4-ordered Hamiltonian: moreover an infinite class of 3-regular 4-ordered graphs was found. In this paper we show that a subclass of generalized Petersen graphs are 4-ordered and give a complete classification for which of these graphs are 4-ordered Hamiltonian. In particular, this answers the open question regarding the existence of an infinite class of 3-regular 4-ordered Hamiltonian graphs. Moreover, a number of results related to other open problems are presented. (C) 2012 Elsevier B.V. All rights reserved.
Enhanced optical absorption and photocatalytic activity of anatase TiO2 through (Si,Ni) codoping
(2012-08-06)
Lin, Yanming
;
Jiang, Zhenyi
;
Zhu, Chaoyuan
;
Hu, Xiaoyun
;
Zhang, Xiaodong
The electronic and optical properties of (Si,Ni)-codoped anatase TiO2 are investigated using the density functional theory. The calculated results indicate that the synergistic effects of (Si,Ni) codoping can effectively extend the optical absorption edge, which can lead to higher visible-light photocatalytic activity than pure anatase TiO2. To verify the reliability of our calculated results, nanocrystalline (Si,Ni)-codoped TiO2 is synthesized by a sol-gel-solvothermal method, and experimental results also show that the (Si,Ni)-codoped sample exhibits better absorption performance and higher photocatalytic activities than pure TiO2. 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4745193]
Composite modified electrode strip
(2012-08-07)
Chen Sz-Hau
;
Lin Chih-Sheng
;
Chen Guan-Tin
;
Lin Yueh-Hui
;
Shen Thomas Y. S.
The present invention provides a surface-modified electrode strip for measuring an electrochemical signal that is synergistically amplified by means of a nano-scaled gold particle layer and a lipid-soluble electron mediator layer. A biosensor comprising the electrode strip is also provided.
Vectors, methods, systems and kits for protein purification
(2012-08-07)
Li Yaw-Kuen
;
Wu Yue-Jin
Disclosed herein are autocleaved peptide linkers for producing purified proteins. The autocleaved peptide linkers are inserted between a chitin binding protein (CBP) and a target protein to form a fusion protein. Upon expression of the fusion protein, it is allowed to pass a chitin matrix so that the CBP portion of the fusion protein may be bound with the chitin matrix, the peptide linker then undergoes auto-cleavage in a buffer solution at a pH value of about 5.5-7.5 to release the target protein. The chitin matrix may be regenerated with another buffer solution at a pH value of about 3-4, that is, to release the bound CBP and return to its unbound form. The chitin matrix may be reused for at least 6 times without losing its function.
交大e-News第123期
(2012-08-07)
Secretariat
;
國立交通大學秘書室
Frequency multiplier device and method thereof
(2012-08-07)
Kuo Chien-Nan
;
Yan Tzu-Chao
The present invention provides a method for identifying a specific number of communicating points having relatively smallest accumulated path values from a plurality of transmitting points for a receiving point in a communication system. The method includes steps of: (a) defining a first coordination of each of the plurality of transmitting points and the receiving point on a complex plane; (b) transferring the first coordination of the receiving point to a second coordination thereof, in which the second coordination of the receiving point is near an origin of the complex plane; and (c) identifying the specific number of transmitting points having relatively smallest accumulated path values based on the second coordination of the receiving point.
Programmable clock generator used in dynamic-voltage-and-frequency-scaling (DVFS) operated in sub- and near- threshold region
(2012-08-07)
Hsieh Chung-Ying
;
Chang Ming-Hung
;
Hwang Wei
A programmable clock generator, which is used in dynamic-voltage-and-frequency-scaling (DVFS) operated in Sub- and Near-Threshold region. The programmable clock generator includes first pulse generating unit and a pulse multiplier. A first counter is configured to generate a first counting signal, so as to control the phase detector comparing the phase difference between a first pulse signal and a second pulse signal. A first control signal is transmitted by a control unit in accordance with a phase difference signal, and the phase of the second pulse signal is adjusted by a lock-in delay unit, so that a predetermined phase is generated between the first pulse signal and the second pulse signal. The PVT variation may be compensated by the programmable clock generator during the sub threshold region. Therefore, the period of reference clock is in the locking range of lock-in delay line.
PIEZOELECTRIC PANEL SPEAKER AND OPTIMAL METHOD OF DESIGNING THE SAME
(2012-08-09)
BAI MINGSIAN R.
;
TSAI YAO KUN
A piezoelectric panel speaker and an optimal method of designing the same is disclosed. In the structure of the speaker, at least one piezoelectric plate attached at a surrounding frame supports a diaphragm inside the surrounding frame. A spacer is inserted between the piezoelectric plate and the diaphragm. The structure of the piezoelectric plates fixed at the surrounding frame improves the speaker performance within the low frequency range. The finite element method is employed to build a mathematical model to simulate the sound pressure loading of the piezoelectric panel speaker. Also, the simulated annealing method is employed to approach the optimal design parameters of the speaker structure.
Design and characterization of a novel amphiphilic chitosan nanocapsule-based thermo-gelling biogel with sustained in vivo release of the hydrophilic anti-epilepsy drug ethosuximide
(2012-08-10)
Hsiao, Meng-Hsuan
;
Larsson, Mikael
;
Larsson, Anette
;
Evenbratt, Hanne
;
Chen, Ying-Yu
Thermo-gelling injectable nanogels, with no burst release of loaded drug, were prepared by a simple route by combining self assembled nanocapsules of amphiphilically modified chitosan with glycerophosphate di-sodium salt and glycerol. The potential as a depot drug delivery system was demonstrated in vivo through the therapeutic effect of ethosuximide (ESM) loaded nanogels, suppressing spike wave discharges (SWDs) in Long Evan rat model. Simultaneously clearance of gels from the site of administration was monitored non-invasively using MRI. The gel structure was characterized using TEM and SEM, confirming the gels to be an assembly of nanocapsules and using two-photon microscopy to visualize the network structure. In vitro drug release studies using ESM revealed that the nanogels exhibited extended, mostly Fickian release. Finally, all investigated formulations displayed excellent cytotoxicity data determined by MTT assay using human retinal pigmented epithelium cells. All presented properties are highly desirable for injectable depot gels for drug delivery. (c) 2012 Elsevier B.V. All rights reserved.
液晶立體顯示裝置
(2012-08-11)
陳政寰
;
黃乙白
;
謝漢萍
;
莊尚智
;
吳其霖
一種液晶立體顯示裝置的結構，包括：在上表面具有複數個次畫素的第一基板，每個次畫素包括：開關元件、儲存電容，以及設於次畫素角落之透光區；下表面有相對於次畫素的複數個濾光區的第二基板；夾置於第一基板上表面以及第二基板下表面之間的液晶層；以及斜向遮罩設置於第二基板外側，由斜向遮罩出至少一個次畫素之全部透光區以及鄰接次畫素之全部儲存電容。
陣列被動式有機發光二極體顯示裝置
(2012-08-11)
孟心飛
;
洪勝富
;
趙宇強
本發明係提供一種陣列被動式有機發光二極體顯示裝置，其包括複數個垂直驅動有機發光電晶體，其具有第一集極、第一柵/基極及第一射極，又第一集極電性連接且相互平行形成複數條第一掃瞄單元，而第一柵/基極亦電性連接且相互平行形成複數條第二掃瞄單元，又第一射極係為其電極，其中第一掃瞄單元係與第二掃瞄單元係相互交錯垂直排列。藉由將垂直式發光電晶體直接垂直結合並驅動有機發光二極體，可增加有機發光二極體顯示裝置中每一畫素之發光面積，以及提高每一畫素的開口率。
無線通訊接收系統及其決定一接收訊號所對應之一發送訊號之裝置及方法
(2012-08-11)
吳文榕
;
吳俊穎
一種無線通訊接收系統及其決定一接收訊號所對應之一發送訊號之裝置及方法，該發送訊號包含複數個子發送訊號。系統選取至少一該等子發送訊號以作為一組基準訊號，該組基準訊號之複數個候選訊號值分別形成一候選幾何空間。將接收訊號分別投影至各該候選幾何空間，以分別產生投影訊號。於各該候選幾何空間中，量化所對應之投影訊號以得到量化投影訊號，各該量化投影訊號與所對應之投影訊號具有一投影距離。最後利用該等投影距離中之一最小者所對應之該量化投影訊號及所對應之該第一候選訊號值，以決定該發送訊號。
適應性音訊控制裝置及其方法
(2012-08-11)
白明憲
;
洪志仁
;
謝秉儒
;
艾學安
本發明揭露一種適應性音訊控制裝置及方法，根據背景噪音的訊號比，對原始訊號提供適當之信號增益，可用於車用音響、通訊產業或視聽娛樂，適應性音訊控制裝置主要結合噪音音量估測裝置、訊號雜訊比裝置、動態範圍控制裝置及一平滑裝置，並結合最小均方演算法，可根據訊號及背景噪音之訊噪比，來調整信號增益，維持穩定之訊噪比，特別適用於車內環境。
具音波感知功能之安全帽
(2012-08-11)
楊耀民
一種具音波感知功能之安全帽，係包括音波裝置、訊號處理裝置、狀態表現裝置與電力供應裝置，經該音波裝置中的音波發射模組發出感測音波，由該音波裝置中的音波接收模組接收感測音波，而由該訊號處理裝置處理感測音波，並控制該狀態表現裝置，使該狀態表現裝置產生相對應的狀態；藉此，用車人可以經由該具音波感知功能之安全帽，而主動且輕鬆地了解到車子的後方或是左、右二側後方的車輛方位，減少騎車分心的狀況，有效降低因此造成的用路人風險，大幅提高整體道路安全。
Digital-to-analog converter
(2012-08-14)
Hsieh Wen-Hung
;
Hung Chung-Chih
The present invention relates to a digital-to-analog converter comprising a differentiation circuit, a conversion circuit, and an integration circuit. The differentiation circuit receives and differentiates a digital signal for producing a differentiation signal. The conversion circuit is coupled to the differentiation circuit. It receives the differentiation signal and produces a conversion signal according to a clock signal and the differentiation signal. The integration circuit is coupled to the conversion circuit. It receives and integrates the conversion signal for producing an analog signal. Thereby, the purpose of reducing distortion noises can be achieved.
Video coding method using image data skipping
(2012-08-14)
Shih Yen-Chi
;
Chang Tian-Sheuan
The present invention discloses the video coding method using image data skipping. Said method detects whether the encoded macro-block has to be skipped and terminated by a likelihood ratio test prior to mode decision. Therefore, the computation burden such as motion estimating and compensating can be properly eliminated. In one embodiment, the skipping likelihood ratio is composed of the encoded block and its predictions associated with the skipping displacement. While the decision threshold adapts according to the mode decision and detection statistics, the false detection and rate-distortion are substantially preserved.
一種應用於顯示器之長時間照光電流衰退現象的校正方法
(2012-08-16)
戴亞翔
;
陳少宏
;
周祿盛
本發明提供一種顯示器之長時間照光電流衰退現象的校正方法，包含：在照光時間下，光感測元件接收該顯示器之環境光及背光光源以得到第一電流值；關閉該顯示器之該背光光源，使得該光感測元件只偵測到環境光而得到第二電流值；比較該第一電流值與該第二電流值以得到一參數值；以及根據參數值對應具有一參數值(R)與一環境光強度之曲線圖，以得到在該照光時間下之該環境光強度。
Raman Scattering for Probing Semiconductor Nanocrystal Arrays with a Low Areal Density
(2012-08-16)
Milekhin, Alexander G.
;
Yeryukov, Nikolay A.
;
Sveshnikova, Larisa L.
;
Duda, Tatyana A.
;
Kosolobov, Sergey S.
We present a study of resonant and surface enhanced Raman scattering by arrays of nanocrystals (cadmium sulfide CdS, lead selenide PbSe, and zinc oxide ZnO) with various areal density fabricated by using the Langmuir-Blodgett technique and colloidal chemistry. Resonant Raman scattering by transverse, longitudinal, and surface optical (TO, LO, and SO) phonons and their overtones up to ninth order was achieved for nanocrystal (NC) arrays by adjusting the laser energy to that of the interband transitions. The resonance enhancement allowed a Raman response from arrays of NCs with a low areal density (down to 10 PbSe NCs per 1 mu m(2)) to be measured. An enhancement of Raman scattering by LO and SO modes in CdS NC arrays with a low areal density by a factor of about 730 was achieved due to the resonant surface enhanced Raman scattering effect.
Excited state dynamics of green fluorescence protein chromophore derivatives investigated with time-resolved fluorescence and transient infrared absorption
(2012-08-19)
Cheng, Chi-Wen
;
Hsu, Hung-Yu
;
Huang, Guan-Jhih
;
Diau, Eric Wei-Guang
;
Yang, Jye-Shane