Browsing by Issue Date, starting with "2008-04-10"

Now showing 1 - 20 of 55705

Seismic self-centering steel beam-to-column moment connections using bolted friction devices
(2008-04-10)
Tsai, Keh-Chyuan
;
Chou, Chung-Che
;
Lin, Chi-Lon
;
Chen, Pei-Ching
;
Jhang, Sheng-Jhih
This paper first presents the force-deformation relationship of a post-tensioned (PT) steel beam-to-column connection constructed with bolted web friction devices (FDs). This paper then describes the test program conducted in the National Center for Research on Earthquake Engineering, Taiwan, on four bolted FDs and four full-scale PT beam-to-column moment connection subassemblies using the FDs. Tests confirm that (1) the hysteretic behavior of four bolted FDs is very stable, (2) the friction coefficient between the steel plate and the brass shim is about 0.34, (3) the proposed force-deformation relationships reasonably predict the experimental responses of the PT connections under cyclically increasing deformations up to a beam peak rotation of 0.05 rad, and (4) the decompression moments do not degrade as beam cyclic deformations increase. Copyright (C) 2007 John Wiley & Sons, Ltd.
Fast-locked clock and data recovery circuit and the method thereof
(2008-04-10)
Chen, Wei-Zen
;
Wei, Chin-Yuan
The present invention discloses a fast-locked clock and data recovery circuit, which adopts a 2× oversampling technology and comprises: a multi phase-outputting phase-locked loop generating a plurality of phases θi; a phase interpolator synthesizing the obtained phases θn and θn+2 into a sampling phase Φn based on the weighting coefficient k; a phase detector detects the phase lead or lag between the input data and the sampling phase and generates an up/down signal; and a phase search engine update the weighting coefficient and modulate the sampling phase according to the up/down correction signals. Further, the present invention proposes a data recovery circuit implementing a binary search method and a 2× oversampling method, whereby the time for clock locking can be greatly reduced. Furthermore, the present invention utilizes a multi-phase time-sharing parallel sampling technology to achieve high-speed operation and low power consumption.
Load Balancing Apparatus And Method In Wireless Network Hotspots
(2008-04-10)
Tsao, Shiao-Li
;
Hsu, Chih-Chien
;
Yu, Tai-Xing
Disclosed is a load balancing apparatus and method in wireless network hotspots, which comprises a resource allocation module and a load balancer. The resources reallocation module establishes the resources module and the relationship between access points (APs) and STAs in the wireless network hotspots, and seeks possible load balance shift paths (LBSPs). From these possible LBSPs, an LBSP is selected. Based on the selected LBSP, the load balancer reallocates network resources and dynamically arranges the load among the APs in the wireless network hotspots. This invention can be applicable to a centralized or a decentralized wireless communication system.
40 GHz Phase Shifter based on Semiconductor Laser
(2008-04-10)
Peng, P. C.
;
Wu, F. M.
;
Lin, C. T.
;
Chen, J. H.
;
Kao, W. C.
This investigation experimentally demonstrates a 40 GHz phase shifter based on a semiconductor laser. The phase shift is achieved by adjusting the bias current and wavelength detuning. The device has an optical delay of 23 ps and a phase shift of about 331 degrees.
Characterization of the histidine-containing phosphotransfer protein B-mediated multistep phosphorelay system in Pseudomonas aeruginosa PAO1
(2008-04-11)
Hsu, Jye-Lin
;
Chen, Hsuan-Cheng
;
Peng, Hwei-Ling
;
Chang, Hwan-You
;
生物科技學系
Certain bacterial two-component sensor kinases possess a histidine-containing phosphotransfer (Hpt) domain to carry out a multistep phosphotransferring reaction to a cognate response regulator. Pseudomonas aeruginosa PAO1 contains three genes that encode proteins with an Hpt domain but lack a kinase domain. To identify the sensor kinase coupled to these Hpt proteins, a phosphorelay profiling assay was performed. Among the 12 recombinant orphan sensor kinases tested, 4 of these sensors (PA1611, PA1976, PA2824, and RetS) transferred the phosphoryl group to HptB (PA3345). The in vivo interaction between HptB and each of the sensors was also confirmed using the bacterial two-hybrid assay. Interestingly, the phosphoryl groups from these sensors all appeared to be transferred via HptB to PA3346, a novel phosphatase consisting of an N-terminal receiver domain and a eukaryotic type Ser/Thr phosphatase domain, and resulted in a significant increase of its phosphatase activity. The subsequent reverse transcription-PCR analysis revealed an operon structure of hptB-PA3346-PA3347, suggesting a coordinate expression of the three genes to carry out a signal transduction. The possibility was supported by the analysis showing PA3347 is able to be phosphorylated on Ser-56, and this phosphoryl group could be removed by PA3346 protein. Finally, analysis of PA3346 and PA3347 gene knock-out mutants revealed that these genes are associated with bacterial swarming activity and biofilm formation. Together, these results disclose a novel multistep phosphorelay system that is essential for P. aeruginosa to respond to a wide spectrum of environmental signals.
互斥狀態保持器（XOR-based　conditional　keeper）及其應用於比對線（match　line）架構
(2008-04-11)
華重憲
;
彭奇偉
;
黃威
本發明係提供一種互斥狀態保持器(XOR-based conditional keeper)及其應用於比對線(match line)架構。本發明係以設置於狀態保持器內之互斥閘接收一與內容定址記憶胞(content addressable memory cell，CAM cell)組同步之時序訊號，並配合由浮動節點傳入之浮動訊號，產生一互斥控制訊號且傳入一P型電晶體中，以產生一資料訊號用以控制互斥狀態保持器，使此互斥狀態保持器得以在不同狀態下，恰當地執行相對應之作動，以取代單純僅有開與關之兩種模式，更將此互斥狀態保持器應用於內容定址記憶體中動態的比對線架構中，以使此動態比對線可達到兼具高抗雜訊能力、低功率損耗以及高處理速度之特性。同時，本發明中的互斥狀態保持器係可適用於所有動態電路(dynamic circuit)，尤其是高扇入電路(high fan-in circuit)之應用。
無感測器之低音補償系統
(2008-04-11)
白明憲
;
李志中
;
林建良
一種無感測器之低音補償系統，包含具前饋控制裝置及回授控制裝置之雙層混合控制架構及振膜速度估測裝置。振膜速度估測裝置利用動態方程式和線性二次高斯理論得到不需感測器的振膜速度估測裝置。前饋控制裝置建置於數位訊號處理器上，及藉由定量回授技術設計回授控制裝置並建置於類比電路，用以加強揚聲裝置工作時的強健性。除此之外，本發明系統具有自動建模與合成濾波器的能力。達到降低揚聲裝置之工作頻率，於不同空間有正確的低頻響度及抑制因長時間工作而產生的參數飄移。
Reduction of photoleakage current in polycrystalline silicon thin-film transistor using NH(3) plasma treatment on buffer layer
(2008-04-14)
Lu, Hau-Yan
;
Chang, Ting-Chang
;
Liu, Po-Tsun
;
Li, Hung-Wei
;
Hu, Chin-Wei
The technology of polycrystalline silicon thin-film transistors (poly-Si TFTs) with low photoleakage current is developed in this work. The electrical characteristics of poly-Si TFTs under illumination were significantly improved employing the NH(3) plasma treatment on the buffer layer, with no need for complicate device structure and additional masks. The trap states that originated from the plasma bombardment on the interface between the poly-Si layer and buffer oxide can effectively recombine the light-induced electron-hole pairs. The fewer residual electron-hole pairs lead to the lower photoleakage current and improved subthreshold swing, as well as maintaining good electrical characteristics in the dark sate. (C) 2008 American Institute of Physics.
Reduction of photoleakage current in polycrystalline silicon thin-film transistor using NH3 plasma treatment on buffer layer
(2008-04-14)
Lu, Hau-Yan
;
Chang, Ting-Chang
;
Liu, Po-Tsun
;
Li, Hung-Wei
;
Hu, Chin-Wei
The technology of polycrystalline silicon thin-film transistors (poly-Si TFTs) with low photoleakage current is developed in this work. The electrical characteristics of poly-Si TFTs under illumination were significantly improved employing the NH3 plasma treatment on the buffer layer, with no need for complicate device structure and additional masks. The trap states that originated from the plasma bombardment on the interface between the poly-Si layer and buffer oxide can effectively recombine the light-induced electron-hole pairs. The fewer residual electron-hole pairs lead to the lower photoleakage current and improved subthreshold swing, as well as maintaining good electrical characteristics in the dark sate. (C) 2008 American Institute of Physics.
Raman spectroscopy of single nanodiamond: Phonon-confinement effects
(2008-04-14)
Sun, K. W.
;
Wang, J. Y.
;
Ko, T. Y.
;
應用化學系
;
應用化學系分子科學碩博班
In this paper, we devise techniques for immobilizing and allocating a single nanodiamond on the electron beam (e-beam) patterned smart substrate. The properly designed coordination markers on the semiconductor substrate and the high throughput of the confocal microscope provide us with a convenient tool to single out a nanodiamond with a size less than 100 nm and to study Raman spectroscopy. We observe a redshift in energy and broadening in the linewidth of the sp(3) bonding Raman peak when the size of the diamond is decreased from 90 to 35 nm. The observed shifts and linewidth broadening arise from the phonon-confinement effects and are in good agreement with calculations reported by [Ager Phys. Rev. B 43, 6491 (1991)] and [Yoshikawa Appl. Phys. Lett. 62, 3114 (1993)]. (C) 2008 American Institute of Physics.
Reliability characteristics of NiSi nanocrystals embedded in oxide and nitride layers for nonvolatile memory application
(2008-04-14)
Chen, Wei-Ren
;
Chang, Ting-Chang
;
Yeh, Jui-Lung
;
Sze, S. M.
;
Chang, Chun-Yen
The authors provided the reliability characteristics of nonvolatile nickel-silicide nanocrystal memories embedded in oxide and nitride layers for next-generation nonvolatile memory application. The charge trapping layer was deposited by sputtering a commixed target in the argon and oxygen/nitrogen ambiances, and then using a low temperature rapid thermal annealing to form nanocrystals. Transmission electron microscope clearly shows the sharpness and the density of nanocrystals. These proposed memory structures were compared for the charge storage ability, retention, and endurance. In addition, we used a simple simulation of electric field for nonvolatile nanocrystals memory to explain the advantages by using the high-k dielectric. (C) 2008 American Institute of Physics.
Formation of cobalt-silicide nanocrystals in Ge-doped dielectric layer for the application on nonvolatile memory
(2008-04-14)
Hu, Chih-Wei
;
Chang, Ting-Chang
;
Liu, Po-Tsun
;
Tu, Chun-Hao
;
Lee, Sheng-Kai
In this work, Ge-doped cobalt-silicon thin film was synthesized using a cosputter system (Co and Si(0.5)Ge(0.5)). The deposited film was annealed in oxygen ambient at 650 degrees C to form cobalt-silicide nanocrystals. The formation of isolated silicide nanocrystals was confirmed by transmission electron microscopy and x-ray photoelectron spectroscopy analysis. In metal-oxide-insulator-oxide-silicon structure, a significant electrical hysteresis is observed and attributed by the presence of the cobalt-silicide nanocrystals and the oxidized Ge elements. (C) 2008 American Institute of Physics.
Characterization of one-dimension edge roughness from far-field irradiance at subwavelength-scale precision
(2008-04-15)
Chu, Shu-Chun
;
Chern, Jyh-Long
;
光電工程學系
;
Department of Photonics
It is proposed and numerically verified that the one-dimensional edge roughness of test sample can be characterized by far-field irradiance measurement at subwavelength-scale precision with a constructed aperture playing as an optical ruler. The precision of the proposed scheme of measurement could be better than 3%, even when the edge roughness is in subwavelength-scale. The influence of sample thickness on the proposed measurement scheme is also investigated and considered. (C) 2007 Elsevier B.V. All rights reserved.
Panpositionable hamiltonicity and panconnectivity of the arrangement graphs
(2008-04-15)
Teng, Yuan-Hsiang
;
Tan, Jimmy J. M.
;
Hsu, Lih-Hsing
;
資訊工程學系
;
Department of Computer Science
The arrangement graph A(n,k) is a generalization of the star graph. It is more flexible in its size than the star graph. There are some results concerning hamiltonicity and pancyclicity of the arrangement graphs. In this paper, we propose a new concept called panpositionable hamiltonicity. A hamiltonian graph G is panpositionable if for any two different vertices x and y of G and for any integer l satisfying d(x,y) <= l <= vertical bar v(G)vertical bar - d(x,y), there exists a hamiltonian cycle C of G such that the relative distance between x and y on C is l. A graph G is panconnected if there exists a path of length l joining any two different vertices x and y with d(x,y) <= l <= vertical bar v(G)vertical bar - 1. We show that An, k is panpositionable hamiltonian and panconnected if k >= 1 and n - k >= 2. (c) 2007 Elsevier Inc. All rights reserved.
Strong Menger connectivity with conditional faults on the class of hypercube-like networks
(2008-04-15)
Shih, Lun-Min
;
Chiang, Chieh-Feng
;
Hsu, Lih-Hsing
;
Tan, Jimmy J. M.
;
資訊工程學系
In this paper, we study the Menger property on a class of hypercube-like networks. We show that in all n-dimensional hypercubelike networks with n - 2 vertices removed, every pair of unremoved vertices u and v are connected by min{deg(u), deg(v)} vertex-disjoint paths, where deg(u) and deg(v) are the remaining degree of vertices u and v, respectively. Furthermore, under the restricted condition that each vertex has at least two fault-free adjacent vertices, all hypercube-like networks still have the strong Menger property, even if there are up to 2n - 5 vertex faults. (C) 2007 Elsevier B.V. All rights reserved.
Calculation of atomic hydrogen and its photoelectron spectra in momentum space
(2008-04-15)
Jiang, T. F.
;
物理研究所
;
Institute of Physics
An essential modification to the kernel in the numerical calculation of hydrogenic momentum wave functions, is presented in this paper. Using only 256 grid points, the calculated eigenvalues, eigenfunctions and the oscillator strengths are shown to be in excellent agreement with the exact analytic results. The reliable pseudocomplete set of momentum space eigenfunctions is then applied to the time-dependent calculation of intense laser pulse on the hydrogen atom. With the advantage of having no boundary reflection during the time evolution, like that inherent in the coordinate space method, the photoelectron spectra of above-threshold-ionization (ATI) are elucidated for four cases. Some of which are not feasible or very difficult to solve with the coordinate space method. Generalization of the method to single-active electron systems is straightforward. Due to the good accuracy with a reasonably small-sized basis set, applications to the currently interested intense case of laser pulse on atom or molecule are expected. (c) 2007 Elsevier B.V. All rights reserved.
XOR-based conditional keeper and an architecture implementing its application to match lines
(2008-04-15)
Hua
;
Chung-Hsien
;
Peng
;
Chi-Wei
;
Hwang
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.
A distributed computation algorithm for solving portfolio problems with integer variables
(2008-04-16)
Li, Han-Lin
;
Tsai, Jung-Fa
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
A portfolio problem with integer variables can facilitate the use of complex models, including models containing discrete asset values, transaction costs, and logical constraints. This study proposes a distributed algorithm for solving a portfolio program to obtain a global optimum. For a portfolio problem with n integer variables, the objective function first is converted into an ellipse function containing n separated quadratic terms. Next, the problem is decomposed into m equal-size separable programming problems solvable by a distributed computation system composed of rn personal computers linked via the Internet. The numerical examples illustrate that the proposed method can obtain the global optimum effectively for large scale portfolio problems involving integral variables. (c) 2007 Elsevier B.V. All rights reserved.
Electrogenerated chemiluminescence of a spirobifluorene-linked bisanthracene: A possible simultaneous, two-electron transfer
(2008-04-16)
Sartin, Matthew M.
;
Shu, Chingfong
;
Bard, Allen J.
;
應用化學系
;
資訊工程學系
We report the electrogenerated Chemiluminescence (ECL) of 2,2'-bis(10-phenylanthracen-9-yl)-9,9'-spirobifluorene (spiro-FPA), a dichromophoric molecule composed of two phenylanthracenes linked by a spirobifluorene moiety (PA similar to X similar to PA). The results are compared to those for 9,10-diphenylanthracene (DPA), a related molecule with a single chromophore. Cyclic voltammetry (CV) of spiro-FPA shows two reversible, closely spaced, one-electron transfers on both reduction and oxidation, occurring at E-1,E-red degrees = -2.02, E-2red degrees = -2.07 V vs SCE and E-1,E-OX degrees = 1.14, E-2,E-OX degrees = 1.20 V vs SCE. The potentials for each pair are close enough to appear as a single peak in CV, indicating that the spirobifluorene moiety interrupts conjugation between the redox centers. The potentials observed are similar to those of DPA, which shows E-red degrees = -2.06 V vs SCE and E-OX degrees = 1.15 V vs SCE. The absorbance spectrum of spiro-FPA shows lambda(max,abs) 377 nm, with epsilon(377) = 25 700 M-1 s(-1), while DPA exhibited lambda(max,abs) = 374 nm, with epsilon(374) = 13 800 M-1 s(-1), demonstrating that spiro-FPA has twice the available chromophores as DPA. Photoluminescence (PL) data for spiro-FPA shows lambda(max,PL) = 434 nm, with Phi(PL) = 0.74, while DPA fluoresces at 420 nm with Phi(PL) 0.91; thus, there is greater solvent or structural relaxation in the spiro-FPA excited state, which may account for the greater internal conversion. Unlike DPA, the ECL spectrum of spiro-FPA exhibits long-wavelength emission not observed in the PL. We attribute this emission to excimers formed during annihilation ECL. Steric hindrance prevents DPA from forming excimers, even in ECL, but spiro-FPA annihilation can occur between pairs of di-ions (PA(center dot-)similar to X similar to PA(center dot-) and PA(center dot+)similar to X similar to PA(center dot+)), which are electrostatically more strongly attracted to one another than the mono-ions. This greater electrostatic attraction may be sufficient to overcome the steric hindrance to excimer formation. Lowering the electrolyte concentration decreases the electrostatic shielding of the ions from one another; thus, the increase in longer wavelength ECL accompanying a decrease in electrolyte concentration supports the role of the di-ions in excimer formation. Additionally, simulations show, consistent with experiment, a more rapid decrease in excimer concentration than in excited monomer concentration as a function of time after each potential pulse. This is probably due to the greater number of scavenging reactions available for di-ions. The simulations are confirmed experimentally when lower potential pulsing frequencies yield lower relative excimer emission. Since an excited state created by one-electron transfer between two di-ions should be rapidly quenched via electron transfer by the other PA moiety, the existence of excimers suggests the possibility of simultaneous, two-electron transfer to generate the excimer.
無線網路熱點中動態負載均衡之裝置與方法
(2008-04-16)
曹孝櫟
;
徐誌謙
;
余泰興
本發明揭露一種無線網路熱點中動態負載均衡之裝置與方法。此裝置包含一資源分配模組和一負載調整單元。此資源分配模組先建立此無線網路熱點中存取點與用戶間的資源模型和關係,並尋找可能的負載均衡轉移路徑,從中選出一負載均衡轉移路徑。根據此路徑,負載調整單元重新分配網路資源並動態調整此無線網路熱點中多個存取點間的負載。本發明適用於集中式與分散式無線通訊系統。