Browsing by Issue Date, starting with "2007-02-21"

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影像式物件追蹤方法
(2007-02-21)
傅智銘
;
黃仲陵
本發明提出一種影像式物件追蹤方法，其特徵為兩階段式的獲取物件區域機率，第一階段是以像素特徵為基礎，第二階段是以候選區塊物件形狀機率為基礎來追蹤與獲取物件區域。本發明可以將系統初始化的動作標準化運用在不同的環境下，且利用運算量低的無標籤追蹤技術，可以有效得到動態軌跡，而不需藉助手套或標記的輔助，用以得到物件的區域與軌跡，作為輔助性人機介面。
Monte Carlo simulations of stress relaxation of entanglement-free Fraenkel chains. II. Nonlinear polymer viscoelasticity
(2007-02-21)
Lin, Y. -H.
;
Das, A. K.
;
應用化學系
;
Department of Applied Chemistry
The nonlinear viscoelastic behavior of the Fraenkel-chain model is studied with respect to the constitutive equation of the Rouse model. Distinctly different from the results of the Rouse model, the Fraenkel-chain model gives the following characteristic nonlinear behavior: (a) The two distinct dynamic modes in the relaxation modulus G(S)(t,lambda)-as observed in the linear region reported in Paper I [Y.-H. Lin and A. K. Das, J. Chem. Phys. 126, 074902 (2007), preceding paper]-or in the first normal-stress difference function G(Psi 1)(t,lambda) are shown to have different strain dependences: strain hardening for the fast mode and strain softening for the slow mode. (b) The Lodge-Meissner relation G(S)(t,lambda)=G(Psi 1)(t,lambda) holds over the whole time range, which has been shown both analytically and by simulation. (c) The second normal-stress difference is nonzero, being positive in the fast-mode region and negative in the slow-mode region. The comparisons between orientation and stress for all tensor components consistently confirm the strong correlation of the slow mode as well as its entropic nature with the segmental-orientation anisotropy as shown in the linear region studied in Paper I. A consequence of this correlation is the applicability of the stress-optical rule in the slow-mode region. This also leads to the expectation that the damping function h(lambda)=G(S)(t,lambda)/G(S)(t,lambda -> 0) and the ratio between the first and second normal-stress differences, N-2(t,lambda)/N-1(t,lambda), are described by the orientation tensor which has the same form as that given by Doi and Edwards [J. Chem. Soc. Faraday Trans. 2 74, 1789 (1978); 74, 1802 (1978)] with independent-alignment approximation for an entangled system. The similarity between the slow mode of an entanglement-free Fraenkel-chain system and the terminal mode of an entangled polymer system as observed in the comparison of theory, simulation, and experiment suggests that the close correlation of the entropic nature of the mode with the orientation anisotropy-as of the Fraenkel segment or the primitive step in the Doi-Edwards theory-is a generally valid physical concept in polymer viscoelasticity. (c) 2007 American Institute of Physics.
Mobility asymmetry in InGaAs/InAlAs heterostructures with InAs quantum wires
(2007-02-21)
Lin, Z. C.
;
Hsieh, W. H.
;
Lee, C. P.
;
Suen, Y. W.
;
電子工程學系及電子研究所
Strong asymmetry of electron mobility in InGaAs/InAlAs heterostructures (lattice matched to InP) with the presence of InAs quantum wires was observed. Self-assembled InAs quantum wires, embedded in an InGaAs matrix close to the hetero-interface, has a strong effect in electron conduction in the interface channel. The low temperature mobility for electrons moving parallel to the quantum wires is much higher than that of electrons moving perpendicular to the wires. The asymmetry in mobility is attributed to the difference in scattering cross section of the quantum wires in these two directions.
資料錯誤率量測裝置及其偽隨機碼產生器
(2007-02-21)
陳巍仁
;
黃冠勝
一種資料錯誤率量測裝置及其偽隨機碼產生器。此資料錯誤率量測裝置包括發送端偽隨機碼產生器、主偽隨機碼產生器、僕偽隨機碼產生器、比較器以及計數單元。發送端偽隨機碼產生器產生平行N位元之原偽隨機碼(N為大於1之整數)，其中待測物接收原偽隨機碼後輸出平行N位元之待測碼。主偽隨機碼產生器產生平行N位元之主偽隨機碼，以及僕偽隨機碼產生器產生平行N位元之僕偽隨機碼。比較器接收並比較待測碼、主偽隨機碼以及僕偽隨機碼是否相同，以及輸出比較結果。計數單元耦接至比較器，用以依據比較結果計數資料錯誤次數。
Monte Carlo simulations of stress relaxation of entanglement-free Fraenkel chains. I. Linear polymer viscoelasticity
(2007-02-21)
Lin, Y. -H.
;
Das, A. K.
;
應用化學系
;
Department of Applied Chemistry
Shear stress relaxation modulus G(S)(t) curves of entanglement-free Fraenkel chains have been calculated using Monte Carlo simulations based on the Langevin equation, carrying out both in the equilibrium state and following the application of a step shear deformation. While the fluctuation-dissipation theorem is perfectly demonstrated in the Rouse-chain model, a quasiversion of the fluctuation-dissipation theorem is observed in the Fraenkel-chain model. In both types of simulations on the Fraenkel-chain model, two distinct modes of dynamics emerge in G(S)(t), giving a line shape similar to that typically observed experimentally. Analyses show that the fast mode arises from the segment-tension fluctuations or reflects the relaxation of the segment tension created by segments being stretched by the applied step strain-an energetic-interactions-driven process-while the slow mode arises from the fluctuations in segmental orientation or represents the randomization of the segmental-orientation anisotropy induced by the step deformation-an entropy-driven process. Furthermore, it is demonstrated that the slow mode is well described by the Rouse theory in all aspects: the magnitude of modulus, the line shape of the relaxation curve, and the number-of-beads (N) dependence of the relaxation times. In other words, one Fraenkel segment substituting for one Rouse segment, it has been shown that the entropic-force constant on each segment is not a required element to give rise to the Rouse modes of motion, which describe the relaxation modulus of an entanglement-free polymer over the long-time region very well. This conclusion provides an explanation resolving a long-standing fundamental paradox in the success of Rouse-segment-based molecular theories for polymer viscoelasticity-namely, the paradox between the Rouse segment size being of the same order of magnitude as that of the Kuhn segment (each Fraenkel segment with a large force constant H-F can be regarded as basically equivalent to a Kuhn segment) and the meaning of the Rouse segment as defined in the Rouse-chain model. The general agreement observed in the comparison of the simulation and experimental results indicates that the Fraenkel-chain model, while being still relatively simple, has captured the key element in energetic interactions-the rigidity on the segment-in a polymer system. (c) 2007 American Institute of Physics.
以茶葉黑色素預防及改善乙醯胺酚（acetaminophen）毒性
(2007-02-21)
黃國華
本發明係關於以茶葉黑色素預防及/或改善乙醯胺酚(acetaminophen)毒性之方法，其包括於攝取過量乙醯胺酚之前或同時對哺乳動物投與有效量之茶葉黑色素；一種可用於預防或降低乙醯胺酚毒性之含有茶葉黑色素之醫藥組成物，以及含有茶葉黑色素與乙醯胺酚之醫藥組成物。
INTERCONNECT OF GROUP III- V SEMICONDUCTOR DEVICE AND FABRICATION METHOD FOR MAKING THE SAME
(2007-02-22)
Lee, Cheng-Shih
;
Chang, Edward Yi
;
Chang, Huang-Choung
An interconnect of the group III-V semiconductor device and the fabrication method for making the same are described. The interconnect includes a first adhesion layer, a diffusion barrier layer for preventing the copper from diffusing, a second adhesion layer and a copper wire line. Because a stacked-layer structure of the first adhesion layer/diffusion barrier layer/second adhesion layer is located between the copper wire line and the group III-V semiconductor device, the adhesion between the diffusion barrier layer and other materials is improved. Therefore, the yield of the device is increased.
Complicated phase behavior and ionic conductivities of PVP-co-PMMA-based polymer electrolytes
(2007-02-23)
Chiu, Chun-Yi
;
Yen, Ying-Jie
;
Kuo, Shlao-Wei
;
Chen, Hsien-Wei
;
Chang, Feng-Chih
We have used DSC, FTIR spectroscopy, and ac impedance techniques to investigate the interactions that occur within complexes of poly(vinylpyrrolidone-co-methyl methacrylate) (PVP-co-PMMA) and lithium perchlorate (LiClO(4)) as well as these systems' phase behavior and ionic conductivities. The presence of MMA moieties in the PVP-co-PMMA random copolymer has an inert diluent effect that reduces the degree of self-association of the PVP molecules and causes a negative deviation in the glass transition temperature (T,). In the binary LiClO(4)/PVP blends, the presence of a small amount of LiClO(4) reduces the strong dipole-dipole interactions within PVP and leads to a lower T(g). Further addition of LiClO(4) increases T(g) as a result of ion-dipole interactions between LiClO(4) and PVP. In LiClO(4)/PVP-co-PMMA blend systems, for which the three individual systems-the PVP-co-PMMA copolymer and the LiClO(4)/PVP and LiClO(4)/PMMA blends-are miscible at all compositional ratios, a phase-separated loop exists at certain compositions due to a complicated series of interactions among the LiClO(4), PVP and PMMA units. The PMMA-rich component in the PVP-co-PMMA copolymer tends to be excluded, and this phenomenon results in phase separation. At a LiClO(4) content of 20 wt% salt, the maximum ionic conductivity occurred for a LiClO(4)/VP57 blend (i.e., 57 mol% VP units in the PVP-co-PMMA copolymer). (c) 2007 Elsevier Ltd. All rights reserved.
Scatterings of massive string states from D-brane and their linear relations at high energies
(2007-02-26)
Chan, Chuan-Tsung
;
Lee, Jen-Chi
;
Yang, Yi
;
電子物理學系
;
Department of Electrophysics
We study scatterings of bosonic massive closed string states at arbitrary mass levels from D-brane. We discover that all the scattering amplitudes can be expressed in terms of the generalized hypergeometric function F-3(2) with special arguments, which terminates to a finite sum and, as a result, the whole scattering amplitudes consistently reduce to the usual beta function. For the simple case of D-particle, we explicitly calculate high-energy limits of a series of the above scattering amplitudes for arbitrary mass levels, and derive infinite linear relations among them for each fixed mass level. The ratios of these high-energy scattering amplitudes are found to be consistent with the decoupling of high-energy zero-norm states of our previous works. (c) 2006 Elsevier B.V. All rights reserved.
Evanescent-field optical amplifiers and lasers
(2007-02-27)
Chen
;
Nan-Kuang
;
Chi
;
Sien
;
Tseng
An optical amplifier and a laser generator based on the fiber side-polished technology having a high pumping efficiency, a low noise figure and a small footprint are provided in this application. The optical amplifier and the laser, which have a very long effective interaction length in conjunction with highly doped Erbium glass attached to its surface and an addition of a slanted fiber grating inscribed in the guiding core at the polished region can spatially separate the signal and pump power to simultaneously improve the pumping efficiency and optimize the penetrated depth of the signal evanescent-field. The spontaneous emission is kept from being amplified and therefore a high quality amplified signal is produced.
Numerical ranges of companion matrices
(2007-03-01)
Gau, Hwa-Long
;
Wu, Pei Yuan
;
應用數學系
;
Department of Applied Mathematics
We show that an n-by-n companion matrix A can have at most n line segments on the boundary a(A) of its numerical range W(A), and it has exactly n line segments on W(A) if and only if, for n odd, A is unitary, and, for n even, A is unitarily equivalent to the direct sum A(1) circle plus A(2) of two (n/2)-by-(n/2) companion matrices [GRAPHICS] with 1 <= vertical bar u vertical bar < tan(pi/n) + sec(pi/n). (c) 2006 Elsevier Inc. All rights reserved.
Quantum pump driven fermionic Mach-Zehnder interferometer
(2007-03-01)
Chung, S. -W. V.
;
Moskalets, M.
;
Samuelsson, P.
;
電子物理學系
;
電子工程學系及電子研究所
We have investigated the characteristics of the currents in a pump driven fermionic Mach-Zehnder interferometer. The system is implemented in a conductor in the quantum Hall regime, with the two interferometer arms enclosing an Aharonov-Bohm flux Phi. Two quantum point contacts with transparency modulated periodically in time drive the current and act as beam splitters. The current has a flux-dependent part I-(Phi) as well as a flux-independent part I-(0). Both current parts show oscillations as a function of frequency on the two scales determined by the lengths of the interferometer arms. In the nonadiabatic, high-frequency regime I-(Phi) oscillates with a constant amplitude while the amplitude of the oscillations of I-(0) increases linearly with frequency. The flux-independent part I-(0) is insensitive to temperature while the flux-dependent part I-(Phi) is exponentially suppressed with increasing temperature. We also find that for low amplitude, adiabatic pumping rectification effects are absent for semitransparent beam splitters. Inelastic dephasing is introduced by coupling one of the interferometer arms to a voltage probe. For a long charge relaxation time of the voltage probe, giving a constant probe potential, I-(Phi) and the part of I-(0) flowing in the arm connected to the probe are suppressed with increased coupling to the probe. For a short relaxation time, with the potential of the probe adjusting instantaneously to give zero time-dependent current at the probe, only I-(Phi) is suppressed by the coupling to the probe.
Low-temperature CVD growth of carbon nanotubes for field emission application
(2007-03-01)
Chen, Kuang-Chung
;
Chen, Chia-Fu
;
Lee, Jen-Hao
;
Wu, Tai-Lin
;
Hwang, Chian-Liang
For field emission application, carbon nanotube emitters were synthesized on catalyst-mixed thick-film electrode lower than 500 degrees C by chemical vapor deposition (CVD) method. Mixtures of Ni/tetraethyl silicate (TEOS) and conducting Ag powders were applied to fabricate the electrode by screen-printing processes. These processes are simple, low cost and easy to scale up for large sized panels. The field emission properties performed uniform emission image and high brightness (no less than 500 nits). The turn-on electric field was about 3.85 V/mu m with an emission current destiny of 10 mu A/cm(2), and the achieved current density was 1 mA/cm(2) driven by 5 V/mu m. (c) 2006 Elsevier B.V. All rights reserved.
Two-stage biofilter for effective NH3 removal from waste gases containing high concentrations of H2S
(2007-03-01)
Chung, Ying-Chien
;
Ho, Kuo-Ling
;
Tseng, Ching-Ping
;
生物科技學系
;
Department of Biological Science and Technology
A high H2S concentration inhibits nitrification when H2S and NH3 are simultaneously treated'in a single biofilter. To improve NH3 removal from waste gases containing concentrated H2S, a two-stage biofilter was designed to solve the problem. In this study, the first biofilter, inoculated with Thiobacillus thioparus, was intended mainly to remove H2S and to reduce the effect of H2S concentration on nitrification in the second biofilter, and the second biofilter, inoculated with Nitrosomonas europaea, was to remove NH3. Extensive studies, which took into account the characteristics of gas removal, the engineering properties of the two biofilters, and biological parameters, were conducted in a 210-day operation. The results showed that an average 98% removal efficiency for H2S and a 100% removal efficiency for NH3 (empty bed retention time = 23-180 sec) were achieved after 70 days. The maximum degradation rate for NH3 was measured as 2.35 g N day(-1) kg of dry granular activated carbon'. Inhibition of nitrification was not found in the biofilter. This two-stage biofilter also exhibited good adaptability to shock loading and shutdown periods. Analysis of metabolic product and observation of the bacterial community revealed no obvious acidification or alkalinity phenomena. In addition, a lower moisture content (similar to 40%) for microbial survival and low pressure drop (average 24.39 mm H2O m(-1)) for system operation demonstrated that the two-stage biofilter was energy saving and economic. Thus, the two-stage biofilter is a feasible system to enhance NH3 removal in the concentrated coexistence of H2S.
Dormancy-break and germination in seeds of Prunus campanulata (Rosaceae): role of covering layers and changes in concentration of abscisic acid and gibberellins
(2007-03-01)
Chen, Shun-Ying
;
Chien, Ching-Te
;
Chung, Jeng-Der
;
Yang, Yuh-Shyong
;
Kuo, Shing-Rong
Intact seeds (seed + endocarp) from freshly harvested fruits of Prunus campanulata were dormant, and required 4-6 weeks of warm followed by 8 weeks of cold stratification for maximum germination percentage. Removing both endocarp and seed coat, however, promoted germination in a high percentage of non-stratified seeds. Treatment of intact, non-stratified seeds with gibberellic acid (GA(3)) was only partially effective in breaking dormancy. However, GA(3) promoted germination of non-stratified seeds in which the endocarp (but not the seed coat) had been removed. The order of abscisic acid (ABA) concentration in fresh seeds was endocarp > seed coat > embryo, and its concentration in endocarp plus seed coat was about 6.2-fold higher than that in the embryo. Total ABA contents of seeds subjected to warm and/or cold moist stratification were reduced 6- to 12-fold. A higher concentration of GA(4) was detected in embryos of non-dormant than in those of dormant seeds. Fluridone, a carotenoid biosynthesis inhibitor, was efficient in breaking dormancy of Prunus seeds. Paclobutrazol, a GA biosynthesis inhibitor, completely inhibited seed germination, and the inhibitory effect could be partially reversed by GA(4), but not by GA(3) Thus, dormancy in P campanulata seeds is imposed by the covering layers. Dormancy break is accompanied by a decrease in ABA content of the covering layers and germination by an increase of embryonic GA(4) content.
Purification of single qubits by collinear photons
(2007-03-01)
Odate, Satoru
;
Takeno, Yuishi
;
Kobayashi, Takayoshi
;
電子物理學系
;
Department of Electrophysics
We have demonstrated purification of a single qubit by two collinear photons, one of which was time-delayed. Our method can be applied to a single qubit many times, and the qubit can be purified to an arbitrarily high degree of purity. Thus, by repeating this method we can make the statistical error that single qubits incur along a transmission channel much smaller.
Layout dependence on threshold voltage instability of hydrogenated amorphous silicon thin film transistors
(2007-03-01)
Tseng, Huai-Yuan
;
Chiang, Ko-Yu
;
Lu, Hau-Yan
;
Kung, Chen-Pang
;
Chang, Ting-Chang
In this paper, we discuss the threshold voltage instability of two distinct layouts of hydrogenated amorphous silicon thin film transistors (a-Si:H TFTs). By simultaneously applying gate and drain bias stress, we show that the average threshold voltage shift of circular a-Si:H TFTs is 54% less than that of conventional inverted staggered a-Si:H TFTs. This result is primarily due to that the circular layout reduces the channel electron concentration. ISE-DESSIS (Integrated System Engineering DEvice Simulation for Smart Integrated Systems) was used to simulate the parallel electric field and obtain the total channel electron concentration. The simulation results closely correspond to the explanation in this study. These results indicate a significant impact of improving threshold voltage stability by a layout method.
Study of an axial flow cyclone to remove nanoparticles in vacuum
(2007-03-01)
Tsai, Chuen-Jinn
;
Chen, Sheng-Chieh
;
Przekop, Rafal
;
Moskal, Arkadiusz
;
環境工程研究所
An axial flow cyclone for removing nanoparticles was tested for collection efficiency. Data were validated numerically in vacuum conditions of several Torrs, with flow rates of 0.35-0.57 slpm. The experimental cutoff aerodynamic diameter of the cyclone ranged from 21.7 to 49.8 nm. A 3-D numerical simulation was conducted first to calculate detailed flow and pressure fields, then a Brownian Dynamics simulation was done to determine the collection efficiency of nanoparticles. Both centrifugal force and Brownian diffusion were taken into account. The simulated results for both pressure drop and cutoff aerodynamic diameter are in good agreement with the experimental data. In comparison, previous theories using simplified tangential flow field assumption are not able to predict collection efficiencies accurately. The numerical model developed in this study can facilitate cyclone design to classify valuable nanopowders below a certain diameter, or to remove toxic nanoparticles from the vacuum exhaust of process chambers commonly used in high-tech industries.
Forecasting electricity market pricing using artificial neural networks
(2007-03-01)
Pao, Hsiao-Tien
;
管理科學系
;
Department of Management Science
Electricity price forecasting is extremely important for all market players, in particular for generating companies: in the short term, they must set up bids for the spot market; in the medium term, they have to define contract policies; and in the long term, they must define their expansion plans. For forecasting long-term electricity market pricing, in order to avoid excessive round-off and prediction errors, this paper proposes a new artificial neural network (ANN) with single output node structure by using direct forecasting approach. The potentials of ANNs are investigated by employing a rolling cross validation scheme. Out of sample performance evaluated with three criteria across five forecasting horizons shows that the proposed ANNs are a more robust multi-step ahead forecasting method than autoregressive error models. Moreover, ANN predictions are quite accurate even when the length of the forecast horizon is relatively short or long. (c) 2006 Elsevier Ltd. All rights reserved.
編輯室報告
(國立陽明交通大學出版社, 2007-03-01)
朱元鴻