Browsing by Issue Date, starting with "2006-07-06"

Now showing 1 - 20 of 63013

Strain enhanced DC-RF performance of 0.13 mu m nMOSFETs on flexible plastic substrate
(2006-07-06)
Chin, A.
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Kao, H. L.
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Kao, C. H.
;
Liao, C. C.
;
Tseng, Y. Y.
A 14.3% saturation current I-d,(sat) improvement and 0.75 dB minimum noise figure (NFmin) at 10 GHz were measured by applying similar to 0.7% tensile strain for 16 finger, 0.13 mu m RF MOSFETs with thin-body (40 mu m) substrate mounted on plastic. These excellent results for mechanical-strain on DC-RF MOSFETs are better than those of SiN-capped 90 nm strained-Si nMOSFETs and consistent with device simulations.
Method for eliminating crosstalk in a metal programmable read only memory
(2006-07-06)
Chang, Meng-Fan
;
Wen, Kuei-Ann
The present invention provides a method for eliminating crosstalk (coupling noise) in a metal programmable read only memory. The metal programmable read only memory comprises a plurality of bit lines, a plurality of word lines, a plurality of precharge transistors, and a plurality of clamp transistors. When one of the bit lines is selected, bit lines adjacent to the selected bit line are fixed to a voltage value (VDD, GND or other voltages) by the clamp transistors. The clamping method can not cause voltage drops to the adjacent bit lines, and the crosstalk on the selected bit line can be eliminated simultaneously, so that the problem of read failures caused by the crosstalk in the high-speed metal programmable read only memory can be solved, and a higher speed can be reached.
Surface KOH treatment in AlGaN-based photodiodes
(2006-07-06)
Lan, W. -H.
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Huang, K. -C.
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Huang, K. F.
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電子物理學系
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Department of Electrophysics
KOH treatment is investigated as a method to improve the IN characteristics of AIGaN-based photodiodes. The defects in the photodiode may enhance the dark current, and cause some photocurrents with incident photon energy less than the absorption edge. With the KOH treatment in the process, the defects and whisker-like features could be reduced. High rejection ratio in the spectral responsivity could be achieved. The KOH treatment is a good method to reduce the surface defects in AlGaN-based photodiodes.
SSH and SHHGaInP/GaAs HBT divide-by-3 prescalers with true 50% duty cycle
(2006-07-06)
Tseng, S. C.
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Meng, C. C.
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Chen, W. Y.
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電信工程研究所
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Institute of Communications Engineering
Two 50% duty cycle divide-by-3 prescalers - sample-sample-hold (SSH) and sample-hold-hold (SHH) prescalers - in the 2 pm GaInP/GaAs heterojunction bipolar transistor (HBT) technology are realised. Current switchable emitter couple logic D flip-flops are employed to form both prescalers. The proposed SHH prescaler functions up to 2.6 GHz while the SSH prescaler operates from DC to 1.75 GHz. The maximum operating frequency of the SHH prescaler is enhanced about 50% compared with that of the SSH prescaler owing to better signal synchronisation.
Metal oxide-assisted laser desorption/ionization mass spectrometry
(2006-07-06)
Chen, Yu-Chie
;
Chen, Cheng-Tai
;
Lin, Ya-Shiuan
The invention provides a simple, rapid and cost-effective metal oxide-assisted laser desorption/ionization mass spectrometry (MOALDI MS) without the addition of light-absorbing organic-matrix, comprising the use of (a) an inorganic metal oxide with light absorbing capability as an assisting material to render desorption/ionization of samples in laser desorption/ionization mass spectrometry and (b) a citric acid buffer as the proton source for enhancing the iorization efficiency for analytes. Metal oxide assisting materials is not only restricted to the uses of films. Metal oxide nanoparticles are also suitable to be used as the assisting materials. Low matrix background, stable surface feature, homogeneous sample deposition, and wide detectable mass range are the merits of MOALDI MS.
Cubic planar Hamiltonian graphs of various types
(2006-07-06)
Kao, Shin-Shin
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Hsu, Kung-Ming
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Hsu, Lih-Hsing
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應用數學系
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Department of Applied Mathematics
Let U be the set of cubic planar hamiltonian graphs, A the set of graphs G in U such that G - upsilon is hantiltonian for any vertex upsilon of G, B the set of graphs G in U such that G - e is hamiltonian for any edge e of G, and C the set of graphs G in U such that there is a hamiltonian path between any two different vertices of G. With the inclusion and/or exclusion of the sets A, B, and C, U is divided into eight subsets. In this paper, we prove that there is an infinite number of graphs in each of the eight subsets. (c) 2006 Elsevier B.V. All rights reserved.
荷花是黑夜這個人手裡提著的燈
(2006-07-08)
管管
Microwave-assisted and traceless synthesis of imidazoquinoxalinones
(2006-07-10)
Lin, Mei-Jung
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Sun, Chung-Ming
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應用化學系
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Department of Applied Chemistry
Effect of three-dimensional current and temperature distributions on void formation and propagation in flip-chip solder joints during electromigration
(2006-07-10)
Liang, S. W.
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Chang, Y. W.
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Shao, T. L.
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Chen, Chih
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Tu, K. N.
Effect of three-dimensional current distribution on void formation in flip-chip solder joints during electromigration was investigated using thermoelectrical coupled modeling, in which the current and temperature redistributions were coupled and simulated at different stages of void growth. Simulation results show that a thin underbump metallization of low resistance in the periphery of the solder joint can serve as a conducting path, leading to void propagation in the periphery of the low current density region. In addition, the temperature of the solder did not rise significantly until 95% of the contact opening was eclipsed by the propagating void. (c) 2006 American Institute of Physics.
你畫清明上河圖呀
(2006-07-10)
管管
即時側向繞射監控光纖位置之布拉格光纖連續寫入方法
(2006-07-11)
徐桂珠
;
許立根
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莊凱評
;
張淑惠
;
賴杰
本發明關於即時監控光纖位置之布拉格光纖連續寫入方法，其特徵在於藉由側向繞射干涉法，以決定每個定位點之光纖光柵及寫入干涉光束之的相對相位，然後逐次寫入，其透過減低或避免因監測光纖位置之長期掃描所生累積誤差，或經由相似之設定製作所需參考布拉格光纖光柵手段，可增加製造長度較長且複雜的光纖光柵結構時的準確性。
Serum repressing efflux pump CDR1 in Candida albicans
(2006-07-13)
Yang, Yun-Liang
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Lin, Yi-Hsuan
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Tsao, Ming-Yang
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Chen, Chia-Geun
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Shih, Hsin-I
Background: In the past decades, the prevalence of candidemia has increased significantly and drug resistance has also become a pressing problem. Overexpression of CDR1, an efflux pump, has been proposed as a major mechanism contributing to the drug resistance in Candida albicans. It has been demonstrated that biological fluids such as human serum can have profound effects on antifungal pharmacodynamics. The aim of this study is to understand the effects of serum in drug susceptibility via monitoring the activity of CDR1 promoter of C. albicans. Results: The wild-type C. albicans cells ( SC5314) but not the cdr1/cdr1 mutant cells became more susceptible to the antifungal drug when the medium contained serum. To understand the regulation of CDR1 in the presence of serum, we have constructed CDR1 promoter-Renilla luciferase ( CDR1p-RLUC) reporter to monitor the activity of the CDR1 promoter in C. albicans. As expected, the expression of CDR1p-RLUC was induced by miconazole. Surprisingly, it was repressed by serum. Consistently, the level of CDR1 mRNA was also reduced in the presence of serum but not N-acetyl-D-glucosamine, a known inducer for germ tube formation. Conclusion: Our finding that the expression of CDR1 is repressed by serum raises the question as to how does CDR1 contribute to the drug resistance in C. albicans causing candidemia. This also suggests that it is important to re-assess the prediction of in vivo therapeutic outcome of candidemia based on the results of standard in vitro antifungal susceptibility testing, conducted in the absence of serum.
DSM-PLW: Single-pass mining of path traversal patterns over streaming Web click-sequences
(2006-07-14)
Li, Hua-Fu
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Lee, Suh-Yin
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Shan, Man-Kwan
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資訊工程學系
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Department of Computer Science
Mining Web click streams is an important data mining problem with broad applications. However, it is also a difficult problem since the streaming data possess some interesting characteristics, such as unknown or unbounded length, possibly a very fast arrival rate, inability to backtrack over previously arrived click-sequences, and a lack of system control over the order in which the data arrive. In this paper, we propose a projection-based, single-pass algorithm, called DSM-PLW (Data Stream Mining for Path traversal patterns in a Landmark Window), for online incremental mining of path traversal patterns over a continuous stream of maximal forward references generated at a rapid rate. According to the algorithm, each maximal forward reference of the stream is projected into a set of reference-suffix maximal forward references, and these reference-suffix maximal forward references are inserted into a new in-memory summary data structure, called SP-forest (Summary Path traversal pattern forest), which is an extended prefix tree-based data structure for storing essential information about frequent reference sequences of the stream so far. The set of all maximal reference sequences is determined from the SP-forest by a depth-first-search mechanism, called MRS-mining (Maximal Reference Sequence mining). Theoretical analysis and experimental studies show that the proposed algorithm has gently growing memory requirements and makes only one pass over the streaming data. (c) 2005 Elsevier B.V. All rights reserved.
Reactant gas transport and cell performance of proton exchange membrane fuel cells with tapered flow field design
(2006-07-14)
Liu, H. C.
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Yan, W. M.
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Soong, C. Y.
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Chen, Falin
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Chu, H. S.
The objective of this work is to examine the reactant gas transport and the cell performance of a proton exchange membrane fuel cell (PEMFC) with a tapered flow channel design. It is expected that, with the reduction in the channel depth along the streamwise direction, the reactant fuel gas in the tapered channel can be accelerated as well as forced into the gas diffuser layer to enhance the electrochemical reaction and thus augment the cell performance. The effects of liquid water formation on the reactant gas transport are taken into account in the present study. Numerical predictions show that the cell performance can be enhanced with the fuel channel tapered, and the enhancement is more noticeable at a lower voltage. The results also reveal that the liquid water effect in general influences the cell performance and the effect becomes significant at lower voltages. (c) 2005 Elsevier B.V. All rights reserved.
Ultrafast carrier capture in charged InAs quantum dots
(2006-07-15)
Sun, K. W.
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Kechiantz, A.
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應用化學系
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應用化學系分子科學碩博班
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Department of Applied Chemistry
We report theoretical and experimental results of our investigation on carrier capture and relaxation processes in undoped and modulation-doped InAs/GaAs self-assembled quantum dots (QDs). We find that carrier capture and relaxation in the ground state is faster in the modulation-doped quantum dots compared to the case in neutral dots at an excitation level as low as one electron-hole pair per dot. The ultrafast photoluminescence (PL) transient rise time observed in the charged dots is attributed to the relaxing of strained field induced by the presence of cold carriers in the dots. The Hamiltonian of electron's interaction with local vibrating field and carrier capture time are also calculated. (c) 2006 Elsevier B.V. All rights reserved.
A composite traffic flow modeling approach for incident-responsive network traffic assignment
(2006-07-15)
Sheu, JB
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
This paper presents a hybrid traffic simulation-based model to address the network traffic route choice issue under conditions of lane-blocking incidents on surface streets. The proposed approach includes four sequential mechanisms: (1) link flow loading, (2) link traffic moving, (3) link cost calculation, and (4) searching the shortest path. To deal with the traffic flows moving on lane-blocking links, specific incident-induced link traffic flow models, which are extended from the Lighthill-Whitham (L-W for short) model, are formulated. A simulation-based approach is then proposed to determine the instantaneous shortest path associated with each vehicle approaching to each given intersection on the network. In addition, numerical examples associated with diverse incident scenarios are investigated. The numerical results demonstrate the competitiveness of the proposed simulation-based method by reducing the network-wide path travel time by 11.4% and the incident impact on link traffic flows by 66.7% in comparison with the Paramics traffic simulator. It is expected that this study can provide linkage between the fields of incident management and dynamic traffic assignment that will allow the development of such related technologies as real-time incident-responsive route guidance and incident management systems. (c) 2005 Elsevier B.V. All rights reserved.
Method for identifying transcription factor binding sites in yeast
(2006-07-15)
Tsai, Huai-Kuang
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Huang, Grace Tzu-Wei
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Chou, Meng-Yuan
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Lu, Henry Horng-Shing
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Li, Wen-Hsiung
Motivation: Identifying transcription factor binding sites (TFBSs) is helpful for understanding the mechanism of transcriptional regulation. The abundance and the diversity of genomic data provide an excellent opportunity for identifying TFBSs. Developing methods to integrate various types of data has become a major trend in this pursuit. Results: We develop a TFBS identification method, TFBSfinder, which utilizes several data sources, including DNA sequences, phylogenetic information, microarray data and ChIP-chip data. Fora TF, TFBSfinder rigorously selects a set of reliable target genes and a set of non-target genes (as a background set) to find overrepresented and conserved motifs in target genes. A new metric for measuring the degree of conservation at a binding site across species and methods for clustering motifs and for inferring position weight matrices are proposed. For synthetic data and yeast cell cycle TFs, TFBSfinder identifies motifs that are highly similar to known consensuses. Moreover, TFBSfinder outperforms well-known methods.
Phase characterization and tunable photoluminescence of Eu-doped strontium-substituted nanohalophosphate
(2006-07-15)
Yang, Chih-Cheng
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Chen, San-Yuan
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Liu, Dean-Mo
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交大名義發表
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National Chiao Tung University
Nanocrystalline Eu-doped powders, Ca5-xSrx(PO4)(3)(OH):Eu3+, were prepared from chemical solutions at room temperature. The crystalline phase and photo luminescence (PL) properties of the halophosphate powders were studied in terms of solution pH value and annealing atmosphere. At pH = 2, both Ca8.3Sr1.7(PO4)(6)Cl-2 and Ca8.3Sr1.7(PO4)(6)(OH)(2) phases were detected, but an increase in solution pH value over 7 led to the formation of only Ca8.3Sr1.7(PO4)(6)(OH)(2) phase. After annealed at 850 degrees C, the sample prepared in pH = 2 solution shows stronger blue emission than that prepared in pH = 10 in the reducing atmosphere. However, for the samples annealed in air atmosphere, the blue emission still can be observed that can be attributed to the reduction of Eu3+ -> Eu2+. The relative intensity of blue to red emissions is dominated not only by annealing atmosphere but also by crystalline phase formed in the sample. These results indicate that the PL properties can be tunable by controlling the solution pH value (crystalline phase) and changing annealing atmosphere. (c) 2006 Elsevier B.V. All rights reserved.
Nanomechanical characteristics of BaxSr1-xTiO3 thin films
(2006-07-15)
Jian, Sheng-Rui
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Chang, Win-Jin
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Fang, Te-Hua
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Ji, Liang-Wen
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Hsiao, Yu-Jen
The nanomechanical properties of barium strontium titanate (BaxSr1-xTiO3, x=0-1) deposited on a silicon substrate were investigated using the metalorganic deposition method. The characteristics of the BaxSr1-xTiO3 thin film's crystalline structure and surface roughness were achieved by means of X-ray diffraction (XRD) and atomic force microscopy (AFM). The results indicated that as the Ba content was decreased and therefore the Sr content was increased a lower leakage current density and a smaller grain size were obtained. Also the mechanical properties such as hardness, Young's modulus and contact stress-strain were also studied by nanoindentation. (c) 2006 Elsevier B.V. All rights reserved.
A novel use of t-packings to construct d-disjunct matrices
(2006-07-15)
Fu, HL
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Hwang, FK
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應用數學系
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Department of Applied Mathematics
A t-packing is an ordered pair (V, P) where V is a nu-set and P is a collection of k-subsets (blocks) of V such that each t-subset of V occurs in at most one block of P. If each t-subset of V occurs in exactly one block of P, then (V, P) is known as a Steiner (t, k, nu)-design. In this paper, we explore a novel use of t-packings to construct d-disjunct matrices. (c) 2006 Elsevier B.V. All rights reserved.