Browsing by Issue Date, starting with "2012-07-03"

Now showing 1 - 20 of 35906

Using Gold Nanoclusters As Selective Luminescent Probes for Phosphate-Containing Metabolites
(2012-07-03)
Li, Po-Han
;
Lin, Ju-Yu
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Chen, Cheng-Tai
;
Ciou, Wei-Ru
;
Chan, Po-Han
Glutathione-bound gold nanoclusters (AuNCs@GSH) can emit reddish photoluminescence under illumination of ultraviolet light. The luminescence of the AuNCs@GSH is quenched when chelating with iron ions (AuNCs@GSH-Fe3+), presumably resulting from the effective electron transfer between the nanoclusters and iron ions. Nevertheless, we found that the luminescence of the gold nanoclusters can be restored in the presence of phosphate-containing molecules, which suggested the possibility of using AuNCs@GSH-Fe3+ complexes as the selective luminescent switches for phosphate-containing metabolites. Phosphate-containing metabolites such as adenosine-5'-triphosphate (ATP) and pyrophosphate play an important role in biological systems. In this study, we demonstrated that the luminescence of the AuNCs@GSH-Fe3+ is switched-on when mixing with ATP and pyrophosphate, which can readily be observed by the naked eye. It results from the high formation constants between phosphates and iron ions. When employing fluorescence spectroscopy as the detection tool, quantitative analysis for phosphate-containing metabolites such as ATP and pyrophosphate can be conducted. The linear range for ATP and pyrophosphate is 50 mu M to sub-millimolar, while the limit of detection for ATP and pyrophosphate are similar to 43 and similar to 28 mu M, respectively. Additionally, we demonstrated that the luminescence of the AuNCs@GSH-Fe3+ can also be turned on in the presence of phosphate-containing metabolites from cell lysates and blood plasma.
Context-based adaptive binary arithmetic coding (CABAC) decoding device and decoding method thereof
(2012-07-03)
Chang Tian-Sheuan
;
Liao Yuan-Hsin
A context-based adaptive binary arithmetic coding (CABAC) decoding device and a coding method thereof are provided. The device comprises: a context memory address calculator, calculating an address identifying a memory location in a context model memory for storage of a context model in next cycle; a mixed context memory, in which the context model of the context memory address calculator is stored and from which the context model is read; a two-bin context adaptive binary arithmetic decoder, outputting several parameters for updating the range and offset of the context model, based on the context model of the mixed context memory and deciding several bins; and a binary syntax element comparator, judging whether a current binary sequence corresponds to the value of syntax elements, based on the bins so as to select a correct memory address.
Disentangling Dynamic Changes of Multiple Cellular Components during the Yeast Cell Cycle by in Vivo Multivariate Raman Imaging
(2012-07-03)
Huang, Chuan-Keng
;
Ando, Masahiro
;
Harnaguchi, Hiro-o
;
Shigeto, Shinsuke
;
應用化學系
Cellular processes are intrinsically complex and dynamic, in which a myriad of cellular components including nucleic acids, proteins, membranes, and organelles are involved and undergo spatiotemporal changes. Label-free Raman imaging has proven powerful for studying such dynamic behaviors in vivo and at the molecular level. To construct Raman images, univariate data analysis has been commonly employed, but it cannot be free from uncertainties due to severely overlapped spectral information. Here, we demonstrate multivariate curve resolution analysis for time-lapse Raman imaging of a single dividing yeast cell. A four-dimensional (spectral variable, spatial positions in the two-dimensional image plane, and time sequence) Raman data "hypercube" is unfolded. to a two-way array and then analyzed globally using multivariate curve resolution. The multivariate Raman imaging thus accomplished successfully disentangles dynamic changes of both concentrations and distributions of major cellular components (lipids, proteins, and polysaccharides) during the cell cycle of the yeast cell. The results show a drastic decrease in the amount of lipids by similar to 50% after cell division and uncover a protein-associated component that has not been detected with previous univariate approaches.
Nursing system
(2012-07-03)
Tsai Chi-Yi
;
Huang Fu-Sheng
;
Lin Chen-Yang
;
Lin Zhi-Sheng
;
Chen Chun-Wei
A nursing system of the present invention can position where a person to be nursed through a sensor network widely deployed in an environment, instantaneously detect if the person to be nursed has an accident, and forward a message to inform a relative or medical staff. An autonomous robot will actively move beside the person to be nursed and transmit real-time images to a remote computer or PDA so that the relative or medical staff can swiftly ascertain the situation of the person to be nursed and the person to be nursed in case of emergency can be rescued as soon as possible.
Wet electrostatic precipitator with pulse jet for cleaning discharge wires
(2012-07-03)
Tsai Chuen-Jinn
;
Lin Guan-Yu
A wet electrostatic precipitator (ESP) is disclosed to have a housing, several discharge wires, two roughened collection electrodes coated with TiO2 or SiO2 nanoparticles, two porous metallic plates, and two roughened glass plates coated with TiO2 or SiO2 nanoparticles. The porous metallic plates and the glass plates coated with TiO2 or SiO2 nanoparticles located above the collection electrodes are used to enhance the uniformity of the water film. When particles are introduced into the ESP, they are charged by gas ions generated by corona discharge, and then migrate to collection electrodes due to electrostatic force. Finally, particles are removed by uniform water film flowing downward along the collection electrodes. Furthermore, pulse jet passing through the small holes on the collection plates is used to clean discharge wires, maintaining electric corona strength and prolonging the operation life.
Variation-tolerant word-line under-drive scheme for random access memory
(2012-07-03)
Chuang Ching-Te
;
Lin Yi-Wei
;
Chen Chia-Cheng
;
Shih Wei-Chiang
A Random Access Memory (RAM) is provided. The RAM includes a plurality of word-line drivers, at least a first tracking transistor and a second tracking transistor. Each word-line driver has an input node receiving a decoding signal, a power node receiving an operation voltage and a driving node driving a word-line. In an embodiment, the first tracking transistor has two channel terminal nodes respectively coupled to the driving node of one of the word-line driver and a channel terminal node of the second tracking transistor; wherein the first tracking transistor has electronic characteristics tracking those of a driving transistor of word-line driver, and the second tracking transistor has electronic characteristics tracking those of pass-gate transistor(s) in each cell of the RAM.
Detection of Gliadin in Foods Using a Quartz Crystal Microbalance Biosensor That Incorporates Gold Nanoparticles
(2012-07-04)
Chu, Pei-Tzu
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Lin, Chih-Sheng
;
Chen, Wei-Jung
;
Chen, Chih-Feng
;
Wen, Hsiao-Wei
This work develops a label-free gliadin immunosensor that is based on changes in the frequency of a quartz crystal microbalance (QCM) chip. A higher sensitivity was obtained by applying 25 nm gold nanoparticles (AuNPs) to the surface of a bare QCM electrode. Subsequently, chicken anti-gliadin antibodies (IgY) were immobilized directly on the AuNP-modified surface by cross-linking amine groups in IgY with glutaraldehyde. Experimental results revealed that the change in frequency exhibited when 2 ppm gliadin was bound to the AuNP-modified electrode was 35 Hz (48%) greater than that of the bare gold electrode. The linear dynamic range in 60% ethanol was from 1 X 10(1) to 2 X 10(5) ppb gliadin, and the calculated limit of detection (LOD) was 8 ppb. The entire detection process was completed in 40 min and was highly repeatable. Additionally, the AuNP-modified QCM system generated results in the detection of gliadin in 10 commercial food products that were consistent with those obtained using an AOAC-approved gliadin kit. In conclusion, the QCM platform provides a potential alternative means of ensuring that people with wheat allergies and celiac patients have access to gliadin-free food.
JOINT SUBCARRIER USAGE RATIO AND POWER ALLOCATION METHOD, SYSTEM USING THE SAME, BASE STATION AND CONTROLLER USING THE SAME
(2012-07-05)
Lee Chiao
;
Wang Li-Chun
;
Huang Jane-Hwa
A joint subcarrier usage ratio and power allocation method, the system and base station, and a controller using the same are proposed. The method is adapted for a femtocell base station using OFDMA technology to jointly select transmission power and subcarrier usage ratio. The method includes a first adjustment process, which simultaneously, dynamically and jointly adjusts the transmission power and the subcarrier usage ratio so as to quickly satisfy capacity requirement and link reliability requirement. The method also includes a second adjustment process for slowly adjusting the transmission power and the subcarrier usage ratio after the capacity requirement and the link reliability requirement are both met in the first adjustment process for stability duration. The second adjustment process helps the femtocell base station achieve maximal power efficiency. An outer-loop control might be used in the method to relax the capacity requirement of one femtocell for quickly achieving a stable situation.
交大e-News第121期
(2012-07-05)
Secretariat
;
國立交通大學秘書室
METHOD FOR BUFFERING CLOCK SKEW BY USING A LOGICAL EFFORT
(2012-07-05)
Hsieh Chung-Ying
;
Chang Ming-Hung
;
Hwang Wei
A method buffers clock skew by using a logical effort, and is applicable to a clock tree that stays in a strong-inversion region, a moderate-inversion region, or a weak-inversion region. The method includes establishing in the clock tree a temperature sensor and a tunable-width buffer, and establishing width and temperature comparative lists according to a logical effort equation, for the tunable-width buffer to be individually applied to the strong-inversion region, the moderate-inversion region, and the weak-inversion region; selecting one from the width and temperature comparative lists that corresponds to one of the inversion regions in which the clock tree stays, enabling the temperature sensor to sense a temperature, and searching the selected width and temperature comparative list for a width that corresponds to the temperature sensed by the temperature sensor; and enabling the tunable-width buffer to perform a width modulation process according to the searched width.
Improvement in uniformity of emission by ZrO2 nano-particles for white LEDs
(2012-07-05)
Chen, Hsin-Chu
;
Chen, Kuo-Ju
;
Lin, Chien-Chung
;
Wang, Chao-Hsun
;
Han, Hau-Vei
The high luminous efficiency and superior uniformity of angular-dependent correlated color temperature (CCT) white light-emitting diodes have been investigated by ZrO2 nano-particles in a remote phosphor structure. By adding ZrO2 nano-particles with silicone onto the surface of the phosphor layer, the capability of light scattering could be enhanced. In particular, the intensity of blue light at large angles was increased and the CCT deviations could be reduced. Besides, the luminous flux was improved due to the ZrO2 nano-particles with silicone providing a suitable refractive index between air and phosphor layers. This novel structure reduces angular-dependent CCT deviations from 1000 to 420 K in the range of -70 degrees to 70 degrees. Moreover, the enhancement of lumen flux was increased by 2.25% at a driving current 120 mA, compared to a conventional remote phosphor structure without ZrO2 nano-particles. Consequently, the ZrO2 nano-particles in a remote phosphor structure could not only improve the uniformity of lighting but also increase the light output.
Geometry Based Efficient Decoder for Underdetermined MIMO Systems and Decoding Method Thereof
(2012-07-05)
Huang Chung-Jung
;
Wu Chih-Yung
;
Lee Ta-Sung
A decoder for underdetermined MIMO systems with low decoding complexity is provided. The decoder consists of two stages: 1. Obtaining all valid candidate points efficiently by slab decoder. 2. Finding the optimal solution by conducting the intersectional operations with dynamic radius adaptation to the candidate set obtained from Stage 1. A reordering strategy is also disclosed. The reordering can be incorporated into the proposed decoding algorithm to provide a lower computational complexity and near-ML decoding performance for underdetermined MIMO systems.
Absorption and fluorescence spectra of the neutral and anionic green fluorescent protein chromophore: Franck-Condon simulation
(2012-07-10)
Huang, Tsung-wei
;
Yang, Ling
;
Zhu, Chaoyuan
;
Lin, Sheng Hsien
;
應用化學系分子科學碩博班
Absorption and fluorescence spectra of the neutral and anionic green fluorescent protein (GFP) chromophore, namely p-hydroxybenzylideneimidazolidinone (p-HBDI), have been simulated using the Franck-Condon factors including inhomogeneous broadening of solvent effect. Ground and the first excited states were calculated by time dependent density functional theory with and without the polarizable continuum model environment. Simulated peak of the neutral/anionic p-HBDI at 380 nm (423 nm)/421 nm agrees with experiment value 370 nm (434 nm)/419 nm for absorption (fluorescence) spectrum. Simulated width of the neutral/anionic p-HBDI at 0.51 eV (0.54 eV)/0.57 eV agrees with experiment value 0.54 eV (0.66 eV)/0.56 eV for absorption (fluorescence) spectrum. (C) 2012 Elsevier B. V. All rights reserved.
Label-free sensor
(2012-07-10)
Meng Hsin-Fei
;
Hong Sheng-Fu
;
Chao Yu-Chiang
;
Liu Chien-Cheng
;
Liu Wen-Hsing
The invention provides a label-free sensor that includes a substrate, a first electrode formed on the substrate, a second electrode formed on the substrate and spaced away from the first electrode, and a semiconductor layer formed on the substrate and being in contact with the first electrode and the second electrode. The semiconductor layer has a plurality of probe groups bonded to the semiconductor layer by functionalization, for sensing a coupling-specific substance having bonding specificity with the probe groups. The semiconductor layer is bonded with the probe groups, and the detection of detected object is performed in an instant, quick, rapid, and sensitive manner by measuring variation in electric current, avoiding the use of fluorescent reading equipment for reading fluorescent signals.
Achieving High Field-Effect Mobility in Amorphous Indium-Gallium-Zinc Oxide by Capping a Strong Reduction Layer
(2012-07-10)
Zan, Hsiao-Wen
;
Yeh, Chun-Cheng
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Meng, Hsin-Fei
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Tsai, Chuang-Chuang
;
Chen, Liang-Hao
Method for OFDM and OFDMA channel estimation
(2012-07-10)
Hung Kun-Chien
;
Lin David W.
This invention discloses a method for OFDM and OFDMA channel estimation via phase-rotated polynomial interpolation and extrapolation (inter/extra-polation). For complexity reason, polynomial inter/extra-polation is an often considered method for channel estimation in orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple access (OFDMA) systems, in which the simplest choice is linear inter/extra-polation. But the performance of this method depends on the accuracy of symbol timing estimation as well as the channel delay spread. The invention mitigates the problem by adding a linear phase factor to polynomial inter/extra-polation, which corresponds to adding a delay (also called delay shift) in the time domain.
Tracking vehicle method by using image processing
(2012-07-10)
Wu Bing-Fei
;
Chen Chao-Jung
;
Kao Chih-Chung
;
Chung Meng-Liang
;
Chiu Chung-Cheng
The invention relates to a method for image processing. First, establish the initial image background information. And retrieve the instant image information. Then calculate the initial image background information and color intensity information of the instant image. Furthermore, adjust the instant image information. Then calculate the moving-object information. Finally, track the moving-object information. It can improve the accuracy rate of detection without the influence of erected height.
Symbol time synchronization method for OFDM systems
(2012-07-10)
Chin Wen-Long
;
Chen Sau-Gee
A symbol time synchronization method for OFDM systems is disclosed. The invention presents a joint maximum-likelihood (ML) synchronization method for symbol time offset (STO) in OFDM systems. The method is developed in frequency domain under time-variant multipath channels. By analyzing the received frequency-domain data, a mathematical model for the joint effects of symbol time offset (STO), carrier frequency offset (CFO) and sampling clock frequency offset (SCFO) is derived. The results are used to formulate a log-likelihood function of two consecutive symbols. The joint estimation's method is robust, because it exhibits high performances in high mobility and time-variant multipath fading channels.
重估一通道脈衝響應之方法、裝置及其電腦程式產品
(2012-07-11)
吳文榕
;
賴允仁
一種重估一通道脈衝響應之方法、裝置及電腦程式產品。該通道脈衝響應包含複數個通道切片，且對應至一通道頻率響應。該方法包含下列步驟：選取該等通道切片其中之一以作為一選定通道切片，其餘作為至少一待處理通道切片；扣除該至少一待處理通道切片對該通道頻率響應之影響，以得一第一通道頻率響應；以一最小平方法及該第一通道頻率響應，更新該選定通道切片；以及將該選定通道切片置換為更新後之該選定通道切片。藉此，可提高通道估測的準確度。
利用時域反射量測懸浮質濃度的方法及其裝置改良
(2012-07-11)
林志平
;
鐘志忠
本發明利用時域反射(Time domain reflectometry,TDR)之原理提出量測懸浮液中懸浮質濃度的裝置與方法改良，該裝置主要包含一可穩定量測電磁波走時的導波器及一溫度感測器，方法中主要係量測感測裝置在懸浮液中之電磁波來回走時及溫度，並利用一已建立之含溫度修正之電磁波走時-懸浮質濃度率定關係，來分析該懸浮液中懸浮質濃度。本發明提高TDR方法的懸浮質濃度量測準確度，且不受懸浮液導電度及懸浮質粒徑之影響，使之可適用於一般工程應用及環境監測之需求。