Browsing by Issue Date, starting with "2007-05-03"

Now showing 1 - 20 of 59719

Asynchronous first-in first-out cell
(2007-05-03)
Chu, Yeh-Lin
;
Hwang, Wei
The present invention discloses an asynchronous first-in-first-out cell, wherein modified Muller C elements are used to reduce the complexity of the circuit of the asynchronous first-in-first-out cell; the asynchronous first-in-first-out cell of the present invention not only can be reusable, but also can apply to a single-supply-voltage system with a single clock frequency or multiple clock frequencies and a multiple-supply-voltage system with a single clock frequency or multiple clock frequencies. Further, when the asynchronous first-in-first-out cell of the present invention is applied to the interface circuit of a dual-supply-voltage 16-point radix-22 GALS-based FFT architecture, considerable power saving and latency reduction can be achieved.
Closed sulfur circulation system
(2007-05-03)
Lin, Jin-Gaw
;
Cheng, Hong-Bang
The present invention provides a closed sulfur circulation wastewater treatment system, which combines autotrophic and heterotrophic denitrification to recycle sulfates. Particularly, the present invention provides a process and a system for wastewater treatment which effectively process wastewater having both high nitrates and low organic carbonaceous sources, and effectively reduce sulfates by-products.
Infrared absorption of gaseous ClCS detected with time-resolved Fourier-transform spectroscopy
(2007-05-07)
Chu, Li-Kang
;
Han, Hui-Ling
;
Lee, Yuan-Pern
;
應用化學系
;
應用化學系分子科學碩博班
A transient infrared absorption spectrum of gaseous ClCS was detected with a step-scan Fourier-transform spectrometer coupled with a multipass absorption cell. ClCS was produced upon irradiating a flowing mixture of Cl2CS and N-2 or CO2 with a KrF excimer laser at 248 nm. A transient band in the region of 1160-1220 cm(-1), which diminished on prolonged reaction, is assigned to the C-S stretching (nu(1)) mode of ClCS. Calculations with density-functional theory (B3P86 and B3LYP/aug-cc-pVTZ) predict the geometry, vibrational wave numbers, and rotational parameters of ClCS. The rotational contour of the spectrum of ClCS simulated based on predicted rotational parameters agrees satisfactorily with experimental observation; from spectral simulation, the band origin is determined to be at 1194.4 cm(-1). Reaction kinetics involving ClCS, CS, and CS2 are discussed. (C) 2007 American Institute of Physics.
Photo-leakage-current characteristic of F incorporated hydrogenated amorphous silicon thin film transistor
(2007-05-07)
Wang, M. C.
;
Chang, T. C.
;
Liu, Po-Tsun
;
Tsao, S. W.
;
Chen, J. R.
The photo-leakage-current (I-PLC) characteristic of F incorporated a-Si:H thin film transistor (TFT) has been studied. The device activation energy (E-a) of a-Si:H(:F) TFTs is higher than those of typical a-Si:H TFTs, and resulted in the shift down of Fermi level in a-Si:H(:F). Experimental results show that the I-PLC of a-Si:H(:F) TFTs is smaller than that of conventional a-Si:H TFTs in the density of states limited region, stemmed from the higher recombination centers present in a-Si:H(:F) material. However, the higher I-PLC is observed in the hole conduction region, resulted from the larger E-a in the a-Si:H(:F) TFTs. (C) 2007 American Institute of Physics.
Efficient white-electrophosphorescent devices based on a single polyfluorene copolymer
(2007-05-07)
Wu, Fang-Iy
;
Yang, Xiao-Hui
;
Neher, Dieter
;
Dodda, Rajasekhar
;
Tseng, Ya-Hsien
An efficient white-light-emitting polymer (W3) is realized by covalently attaching a green fluorophore and a red phosphor into the backbone and the side chains, respectively, of polyfluorene at a concentration of 0.04 mol %. In addition, charge-transporting pendant units are included to improve carrier injection and transport. White-electrophosphorescent devices with the structure ITO/PEDOT.PSSiW3/CsF/Al (ITO: indium tin oxide; PEDOT.PSS: poly(styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene)) exhibit a low turn-on voltage of 2.8 V and a luminance of ca. 10(3) cd m(-2) at below 6 V. The peak luminance and power-conversion efficiencies are 8.2 cd A(-1) and 7.2 lm W-1, respectively. Furthermore, the device shows relatively stable white emission: the Commission Internationale d'Eclairage (CIE) chromaticity coordinates of the devices change only slightly from (0.35,0.38) at 10 mA cm(-2) to (0.33,0.36) at 100 mA cm(-2), with an almost constant color render index (CRI) value of 82 at all measured current densities.
Small angle x-ray scattering measurements of lithographic patterns with sidewall roughness from vertical standing waves
(2007-05-07)
Wang, Chengqing
;
Jones, Ronald L.
;
Lin, Eric K.
;
Wu, Wen-Li
;
Leu, Jim
Small angle x-ray scattering (SAXS) measurements are used to quantify the wavelength and amplitude of the sidewall roughness in a lithographic line:space pattern due to vertical standing waves present during the photoresist exposure. Analytic equations are derived to model the x-ray scattering intensity and are used to determine the periodicity and amplitude of the standing wave roughness. The average periodicity, or pitch, and the linewidth were L=422 +/- 1 nm and w(0)=148 +/- 1 nm. The period and amplitude of the standing wave roughness were lambda(s)=65 +/- 1 nm and A(s)=3.0 +/- 0.5 nm. These results demonstrate the potential of SAXS measurements to quantify nondestructively and quantitatively dimensional deviations from an ideal structure. (C) 2007 American Institute of Physics.
交大e-News第001期
(2007-05-07)
Secretariat
;
國立交通大學秘書室
Soft-mold-induced self-construction of polymer patterns under microwave irradiation
(2007-05-07)
Ko, Fu-Hsiang
;
Wu, Chia-Tien
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Chen, Mei-Fen
;
Chen, Jem-Kun
;
Chu, Tieh-Chi
In this study, the authors used a soft-mold-induced self-construction method to fabricate three-dimensional patterns under microwave irradiation for 1 min. The authors estimated the actual pattern growth temperature using a fluorescence probe technique. The temperature at which pattern growth originated was, by necessity, higher than the glass transition temperature of the novolak resist. Electrostatic forces and surface tension effects under the electromagnetic field contributed significantly to the pattern growth, and the use of an antisticking agent allowed easy demolding. (C) 2007 American Institute of Physics.
Single glass substrate liquid crystal device using electric field-enforced phase separation and photoinduced polymerization
(2007-05-07)
Ren, Hongwen
;
Wu, Shin-Tson
;
Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
An in-plane switching liquid crystal (LC) cell using a glass substrate and a photoinduced polymer layer is demonstrated. The fabrication process is based on the electrodynamics of dielectric fluids. When the fringing field is present, the LC molecules tend to aggregate in the strong electric field regions while the monomers diffuse to the weak field regions. After photopolymerization, the LC molecules are confined by a thin polymer layer and polymer walls which define the cell gap. This approach enables single-substrate large panel display devices to be fabricated. (C) 2007 American Institute of Physics.
Growth of Cu nanobelt and Ag belt-like materials by surfactant-assisted galvanic reductions
(2007-05-08)
Huang, Ting-Kai
;
Cheng, Tzu-Hou
;
Yen, Ming-Yu
;
Hsiao, Wei-Han
;
Wang, Lung-Shen
We demonstrate the syntheses of single crystalline Cu nanobelt and Ag belt-like materials via CTAC-assisted (CTAC, cetyltrimethylammonium chloride) galvanic reductions. The single crystalline face-centered cubic phase Cu nanobelt was prepared by reacting CuCl2(aq) with Al(s) in an aqueous solution of CTAC and HNO3. The Cu nanobelt exhibited a high-quality ribbon-like nanostructure with a thickness less than 15 nm, a width of 30-150 nm, and a length up to 10 mu m. The belt-like Ag, with a thickness less than 10 nm, a width of 30-100 nm, a length up to 5 mu m, and a novel single crystalline 4H structure, was prepared by reacting AgNO3(aq) and Cu(s) in an aqueous solution of CTAC.
Raman study of alloy potential fluctuations in MgxZn1-xO nanopowders
(2007-05-09)
Pan, Ching-Ju
;
Lin, Kuo-Feng
;
Hsu, Wei-Tse
;
Hsieh, Wen-Feng
;
光電工程學系
The blueshift of near-band-edge emission and excitonic absorption indicate that Zn2+ ions are successfully substituted by Mg2+ ions in MgxZn1-xO nanopowders for 0 <= x <= 0.14. The changes in Raman spectral linewidth and the asymmetry of the E-2 ( high) mode for various Mg contents can be well described by a modified spatial correlation model that considers the grain size distribution. With increasing Mg concentration, the alloy potential fluctuations lead to a decrease in the grain size, which is induced by the surplus Mg2+ that could form MgO clusters surrounding the crystalline MgZnO.
Combinatorial Computational Approaches to Identify Tetracycline Derivatives as Flavivirus Inhibitors
(2007-05-09)
Yang, Jinn-Moon
;
Chen, Yan-Fu
;
Tu, Yu-Yin
;
Yen, Kuei-Rong
;
Yang, Yun-Liang
Limited structural information of drug targets, cellular toxicity possessed by lead compounds, and large amounts of potential leads are the major issues facing the design-oriented approach of discovering new leads. In an attempt to tackle these issues, we have developed a process of virtual screening based on the observation that conformational rearrangements of the dengue virus envelope protein are essential for the mediation of viral entry into host cells via membrane fusion. Screening was based solely on the structural information of the Dengue virus envelope protein and was focused on a target site that is presumably important for the conformational rearrangements necessary for viral entry. To circumvent the issue of lead compound toxicity, we performed screening based on molecular docking using structural databases of medical compounds. To enhance the identification of hits, we further categorized and selected candidates according to their novel structural characteristics. Finally, the selected candidates were subjected to a biological validation assay to assess inhibition of Dengue virus propagation in mammalian host cells using a plaque formation assay. Among the 10 compounds examined, rolitetracycline and doxycycline significantly inhibited plaque formation, demonstrating their inhibitory effect on dengue virus propagation. Both compounds were tetracycline derivatives with IC(50)s estimated to be 67.1 mu M and 55.6 mu M, respectively. Their docked conformations displayed common hydrophobic interactions with critical residues that affected membrane fusion during viral entry. These interactions will therefore position the tetracyclic ring moieties of both inhibitors to bind firmly to the target and, subsequently, disrupt conformational rearrangement and block viral entry. This process can be applied to other drug targets in which conformational rearrangement is critical to function.
Studies on the electronic and vibrational states of colloidal CdSe/ZnS quantum dots under high pressures
(2007-05-09)
Yuan, C. T.
;
Lin, Y. C.
;
Chen, Y. N.
;
Chiu, Q. L.
;
Chou, W. C.
The electronic and vibrational states of colloidal core/shell CdSe/ZnS quantum dots are studied at room temperature by using high pressure optical measurements. Pressure-induced quadratic variations of lattice constants can be observed clearly from both photoluminescence ( PL) and Raman spectra up to similar to 7 GPa. This quadratic relationship is consistent with the theoretical prediction. The pressure coefficients of linear and quadratic terms are 32 meV GPa(-1), -1 meV GPa(-2) for PL and 4.2 cm(-1) GPa(-1), -0.1 cm(-1) GPa(-2) for Raman measurements, respectively.
Method for automatic key posture information abstraction
(2007-05-10)
Liao, Hong-Yuan Mark
;
Chen, Duan-Yu
The method for automatic key posture information abstraction of this invention comprises the steps of: Abstracting from a series of continuous digitized images spatial features of objects contained in said images; abstracting shape features of said objects using a method of probability calculation; detecting key posture information contained in said series of continuous images using a method of entropy calculation; removing redundant key postures; mating obtained key postures with key posture templates stored in a codebook; and encoding mated key postures.
A low-power CMOS LNA for ultra-wideband wireless receivers
(2007-05-10)
Lee, Yi-Ching
;
Tarng, Jenn-Hwan
;
電信工程研究所
;
Institute of Communications Engineering
In this paper, a low-power ultra-wideband (UWB) low-noise amplifier (LNA) is proposed. Here, we propose a structure to combine the common gate with band pass filters, which can reduce parasitic capacitance of the transistor and to achieve input wideband matching. The pi-section LC network technique is employed in the LNA to achieve sufficient. at gain. A bias resistor of large value is placed between the source and the body nodes to prevent body effect and reduce noise. Numerical simulation based on TSMC 0.18 mu m 1P6M process. It achieved 10.0 similar to 12.4 dB gain from 3 GHz to 10.6 GHz and 3.25 dB noise figure in 8.5 GHz, operates from 1.5 V power supply, and dissipates 3 mW without the output buffer.
XOR-based conditional keeper and an architecture implementing its application to match lines
(2007-05-10)
Hua, Chung-Hsien
;
Peng, Chi-Wei
;
Hwang, Wei
The present invention discloses an XOR-based conditional keeper and an architecture implementing its application to match lines, wherein the XOR gate in the conditional keeper receives a clock signal synchronous with CAM (Content Addressable Memory) cells and cooperates with a floating signal from the floating node to create an XOR control signal, and the XOR control signal is transmitted to a P-type transistor to create a data signal to control the XOR-based conditional keeper so that the XOR-based conditional keeper can execute an appropriate corresponding action, which can replace the conventional keepers of merely “on” and “off” modes. Further, the XOR-based conditional keeper of the present invention can apply to the dynamic CAM match line architecture so that the dynamic match line can have lower power consumption, higher noise immunity, and high processing speed. Further, the XOR-based conditional keeper of the present invention can also apply to all kinds of dynamic circuits, particularly to a high fan-in circuit.
Micro knife-edge optical measurement device in a silicon-on-insulator substrate
(2007-05-14)
Chiu, Yi
;
Pan, Jiun-Hung
;
電控工程研究所
;
Institute of Electrical and Control Engineering
The knife-edge method is a commonly used technique to characterize the optical profiles of laser beams or focused spots. In this paper, we present a micro knife-edge scanner fabricated in a silicon-on-insulator substrate using the micro-electromechanical-system technology. A photo detector can be fabricated in the device to allow further integration with on-chip signal conditioning circuitry. A novel backside deep reactive ion etching process is proposed to solve the residual stress effect due to the buried oxide layer. Focused optical spot profile measurement is demonstrated. (C) 2007 Optical Society of America.
Convergence of phase fluctuation induced by intrachannel four-wave mixing in differential phase-shift keying transmission systems via phase fluctuation averaging
(2007-05-15)
Wei, Chia Chien
;
Chen, Jason (Jyehong)
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光電工程學系
;
Department of Photonics
This work investigates the effect of phase fluctuation averaging on phase fluctuation induced by intrachannel four-wave mixing (IFWM) in highly dispersed differential phase-shift keying transmission systems. Through repeatedly averaging the phase fluctuations of adjacent pulses, a simple analytical model and numerical simulation revealed that the IFWM-induced differential phase fluctuation is suppressed and convergent, even after an ultralong transmission. The influence of averaging the phase fluctuations on the bit error rate is also evaluated by the semianalytical method. (c) 2007 Optical Society of America.
Restricted connectivity for three families of interconnection networks
(2007-05-15)
Chen, Y-Chuang
;
Tan, Jimmy J. M.
;
資訊工程學系
;
Department of Computer Science
Vertex connectivity and edge connectivity are two important parameters in interconnection networks. Even though they reflect the fault tolerance correctly, they undervalue the resilience of large networks. By the concept of conditional connectivity and super-connectivity, the concept of restricted vertex connectivity and restricted edge connectivity of graphs was proposed by Esfahanian [A.H. Esfahanian, Generalized measures of fault tolerance with application to N-cube networks, IEEE Transactions on Computers 38 (1989) 1586-1591]. Such measures take the resilience of large networks into consideration. In this paper, we propose three families of interconnection networks and discuss their restricted vertex connectivity and restricted edge connectivity. In particular, the hypercubes, twisted-cubes, crossed-cubes, mobius cubes, star graphs, pancake graphs, recursive circulant graphs, and k-ary n-cubes are special cases of these families. (c) 2006 Elsevier Inc. All rights reserved.
iPTREE-STAB: interpretable decision tree based method for predicting protein stability changes upon mutations
(2007-05-15)
Huang, Liang-Tsung
;
Gromiha, M. Michael
;
Ho, Shinn-Ying
;
生物科技學系
;
生物資訊及系統生物研究所
We have developed a web server, iPTREE-STAB for discriminating the stability of proteins (stabilizing or destabilizing) and predicting their stability changes (AAG) upon single amino acid substitutions from amino acid sequence. The discrimination and prediction are mainly based on decision tree coupled with adaptive boosting algorithm, and classification and regression tree, respectively, using three neighboring residues of the mutant sit. along N- and C-terminals. Our method showed an accuracy of 82% for discriminating the stabilizing and destabilizing mutants, and a correlation of 0.70 for predicting protein stability changes upon mutations.