Browsing by Issue Date, starting with "2012-01-24"

Now showing 1 - 20 of 37442

System for producing the parameters of a bass-enhanced loudspeaker enclosure
(2012-01-24)
Bai Ming-Sian R.
;
Zhang Huan-Sheng
;
Chen Rong-Liang
A system for producing parameters for a bass-enhanced loudspeaker enclosure; meanwhile, a low-frequency extended frequency, a quality and quantity ratio and radius of a port need to be defined for the system. Also, the resonance frequency of a mechanical system and the quality and quantity of a mechanical system are fixed to obtain the parameters for the frequency ratio, the length of the duct and the cavity volume inside the device, etc. and to manufacture the bass-enhanced loudspeaker enclosure.
Reading device
(2012-01-24)
Sun Ching-Cherng
;
Yu Yeh-Wei
A reading device includes a spatial light modulator, a zoom lens set, an object lens, an image sensor, and an adjusting module. The spatial light modulator provides a reading beam. The zoom lens set forms the reading beam into a real image. The object lens focuses the real image onto a collinear holographic storage medium and thus produces a diffraction signal. The image sensor converts the diffraction signal into an electric signal. The adjusting module adjusts the optical magnification of the zoom lens set according to the quality of the diffraction signal.
System and method for measuring dispersion
(2012-01-24)
Jyu Siao-Shan
;
Lai Yin-Chieh
;
Liu Shiou-Fong
;
Hsiang Wei-Wei
;
Chang Hon-Chieh
A method for measuring dispersion in an optical fiber is provided and includes the following steps. A periodic wavelength variation pulse light signal is generated by a periodic frequency-swept pulse light source, in which the periodic wavelength variation pulse light signal has periodic wavelength variations. The periodic wavelength variation pulse light signal is transmitted into a test optical fiber. The periodic wavelength variation pulse light signal propagating through the test optical fiber is detected to generate a sensing signal. The sensing signal is transformed into an RF spectrum to obtain a slow periodic pulse timing variation of the periodic wavelength variation pulse light signal in accordance with the RF spectrum. A dispersion value of the test optical fiber is obtained in accordance with the slow periodic pulse timing variation. A system for measuring dispersion in a fiber is also disclosed herein.
Modeling frequency modulated responses of midbrain auditory neurons based on trigger features and artificial neural networks
(2012-01-24)
Chang, T. R.
;
Chiu, T. W.
;
Sun, X.
;
Poon, Paul W. F.
;
生物科技學系
Frequency modulation (FM) is an important building block of communication signals for animals and human. Attempts to predict the response of central neurons to FM sounds have not been very successful, though achieving successful results could bring insights regarding the underlying neural mechanisms. Here we proposed a new method to predict responses of FM-sensitive neurons in the auditory midbrain. First we recorded single unit responses in anesthetized rats using a random FM tone to construct their spectro-temporal receptive fields (STRFs). Training of neurons in the artificial neural network to respond to a second random FM tone was based on the temporal information derived from the STRF. Specifically, the time window covered by the presumed trigger feature and its delay time to spike occurrence were used to train a finite impulse response neural network (FIRNN) to respond to this random FM. Finally we tested the model performance in predicting the response to another similar FM stimuli (third random FM tone). We found good performance in predicting the time of responses if not also the response magnitudes. Furthermore, the weighting function of the FIRNN showed temporal 'bumps' suggesting temporal integration of synaptic inputs from different frequency laminae. This article is part of a Special Issue entitled: Neural Coding. (C) 2011 Elsevier B.V. All rights reserved.
Combination of Molecular, Morphological, and Interfacial Engineering to Achieve Highly Efficient and Stable Plastic Solar Cells
(2012-01-24)
Chang, Chih-Yu
;
Cheng, Yen-Ju
;
Hung, Shih-Hsiu
;
Wu, Jhong-Sian
;
Kao, Wei-Shun
A flexible solar device showing exceptional air and mechanical stability is produced by simultaneously optimizing molecular structure, active layer morphology, and interface characteristics. The PFDCTBT-C8-based (see figure) devices with inverted architecture exhibited excellent power conversion efficiencies of 7.0% and 6.0% on glass and flexible substrates, respectively.
Probing annihilations and decays of low-mass galactic dark matter in IceCube DeepCore array: Track events
(2012-01-25)
Lee, Fei-Fan
;
Lin, Guey-Lin
;
物理研究所
;
Institute of Physics
The deployment of DeepCore array significantly lowers IceCube's energy threshold to about 10 GeV and enhances the sensitivity of detecting neutrinos from annihilations and decays of light dark matter. To match this experimental development, we calculate the track event rate in DeepCore array due to neutrino flux produced by annihilations and decays of galactic dark matter. We also calculate the background event rate due to the atmospheric neutrino flux for evaluating the sensitivity of DeepCore array to galactic dark matter signatures. Unlike previous approaches, which set the energy threshold for track events at around 50 GeV (this choice avoids the necessity of including the oscillation effect in the estimation of atmospheric background event rate), we have set the energy threshold at 10 GeV to take full advantage of DeepCore array. We compare our calculated sensitivity with those obtained by setting the threshold energy at 50 GeV. We conclude that our proposed threshold energy significantly improves the sensitivity of DeepCore array to the dark matter signature for m (chi) < 100 GeV in the annihilation scenario and m (chi) < 300 GeV in the decay scenario.
Diffusion barrier characteristics and shear fracture behaviors of eutectic PbSn solder/electroless Co(W,P) samples
(2012-01-25)
Pan, Hung-Chun
;
Hsieh, Tsung-Eong
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Diffusion barrier characteristics, activation energy (E(a)) of IMC growth and bonding properties of amorphous and polycrystalline electroless Co(W,P) (termed as alpha-Co(W,P) and poly-Co(W,P)) to eutectic PbSn solder are presented. Intermetallic compound (IMC) spallation and an nano-crystalline P-rich layer were observed in PbSn/alpha-Co(W,P) samples subjected to liquid-state aging at 250 degrees C. In contrast, IMCs resided on the P-rich layer in PbSn/alpha-Co(W,P) samples subjected to solid-state aging at 150 degrees C. Thick IMCs neigh-boring to an amorphous W-rich layer was seen in PbSn/poly-Co(W,P) samples regardless of the aging type. alpha-Co(W,P) was found to be a sacrificial- plus stuffed-type barrier while poly-Co(W,P) is mainly a sacrificial-type barrier. The values of E(a)'s for PbSn/alpha-Co(W,P) and PbSn/poly-Co(W,P) systems were 338.6 and 167.5 kJ/mol, respectively. Shear test revealed the ductile mode dominates the failure in both alpha- and poly-Co(W,P) samples. Analytical results indicated the high P content in electroless layer might enhance the barrier capability but degrade the bonding strength. (C) 2011 Elsevier B.V. All rights reserved.
PHOTO TRANSISTOR
(2012-01-26)
ZAN HSIAO-WEN
;
MENG HSIN-FEI
;
TSAI CHUANG-CHUANG
;
CHEN WEI-TSUNG
;
CHAO YU-CHIANG
A phototransistor includes a substrate, a gate layer, a dielectric layer, an active layer, a source and a drain, and a light absorption layer. The gate layer is disposed on a top of the substrate, and the dielectric layer is disposed on a top of the gate layer. The active layer has a first bandgap and is disposed on a top of the dielectric layer, and the source and the drain are disposed on a top of the active layer. The light absorption layer has a second bandgap and is capped on the active layer, and the second bandgap is smaller than the first bandgap.
Self-aligned top-gate thin film transistors and method for fabricating same
(2012-01-26)
Zan Hsiao-Wen
;
Chen Wei-Tsung
;
Chou Cheng-Wei
;
Tsai Chuang-Chuang
A self-aligned top-gate thin film transistor and a fabrication method thereof. The method includes preparing a substrate having sequentially formed thereon an oxide semiconductor layer, a dielectric layer, and a metallic layer, wherein the oxide semiconductor layer includes first and second connecting regions that are not covered by the dielectric layer and the metallic layer thereon respectively, the first and second connecting regions having a property of a conductor after undergone a heating process or an ultraviolet irradiation; and a source electrode and a drain electrode formed on the substrate and connected to the first and second connecting regions, respectively. Therefore, the contact resistance of the first and second connecting regions can be reduced without the process of ion dopants as required by prior art techniques, thereby simplifying the manufacturing process. Also, the source electrode and the drain electrode can be exactly relocated and further increase performance of the device.
Gaming control using a wearable and wireless EEG-based brain-computer interface device with novel dry foam-based sensors
(2012-01-28)
Liao, Lun-De
;
Chen, Chi-Yu
;
Wang, I-Jan
;
Chen, Sheng-Fu
;
Li, Shih-Yu
A brain-computer interface (BCI) is a communication system that can help users interact with the outside environment by translating brain signals into machine commands. The use of electroencephalographic (EEG) signals has become the most common approach for a BCI because of their usability and strong reliability. Many EEG-based BCI devices have been developed with traditional wet- or micro-electro-mechanical-system (MEMS)-type EEG sensors. However, those traditional sensors have uncomfortable disadvantage and require conductive gel and skin preparation on the part of the user. Therefore, acquiring the EEG signals in a comfortable and convenient manner is an important factor that should be incorporated into a novel BCI device. In the present study, a wearable, wireless and portable EEG-based BCI device with dry foam-based EEG sensors was developed and was demonstrated using a gaming control application. The dry EEG sensors operated without conductive gel; however, they were able to provide good conductivity and were able to acquire EEG signals effectively by adapting to irregular skin surfaces and by maintaining proper skin-sensor impedance on the forehead site. We have also demonstrated a real-time cognitive stage detection application of gaming control using the proposed portable device. The results of the present study indicate that using this portable EEG-based BCI device to conveniently and effectively control the outside world provides an approach for researching rehabilitation engineering.
Intra-cavity stimulated emissions of photons in almost pure spin states without imposed nonreciprocity
(2012-01-30)
Chang, Shu-Wei
;
光電工程學系
;
Department of Photonics
We propose a chiral Fabry-Perot cavity in which only the cavity modes in almost pure spin (circular polarization) states lase in the presence of gain. In absence of imposed nonreciprocal environments and time-reversal symmetry breaking of emitter states to favor the emission of circularly-polarized photons, only the resonance of modes with a specific spin orientation remains in the cavity. We demonstrate a prototype of the cavity using distributed Bragg reflectors and cholesteric liquid crystals. This reciprocal cavity may provide a method to control the angular momentum state of emitters based on stimulated emissions. (C) 2012 Optical Society of America
The initial value problem for some hyperbolic-dispersive system
(2012-01-30)
Kawashima, Shuichi
;
Lin, Chi-Kun
;
Segata, Jun-ichi
;
應用數學系
;
數學建模與科學計算所(含中心)
We consider the initial value problem for some nonlinear hyperbolic-dispersive systems in one space dimension. Combining the classical energy method and the smoothing estimates for the Airy equation, we guarantee the time local well-posedness for this system. We also discuss the extension of our results to more general hyperbolic-dispersive system. Copyright (C) 2011 John Wiley & Sons, Ltd.
Efficient transportation of nano-sized particles along slotted photonic crystal waveguide
(2012-01-30)
Lin, Pin-Tso
;
Lee, Po-Tsung
;
光電工程學系
;
Department of Photonics
We design a slotted photonic crystal waveguide (S-PhCW) and numerically propose that it can efficiently transport polystyrene particle with diameter as small as 50 nm in a 100 nm slot. Excellent optical confinement and slow light effect provided by the photonic crystal structure greatly enhance the optical force exerted on the particle. The S-PhCW can thus transport the particle with optical propulsion force as strong as 5.3 pN/W, which is over 10 times stronger than that generated by the slotted strip waveguide (S-SW). In addition, the vertical optical attraction force induced in the S-PhCW is over 2 times stronger than that of the S-SW. Therefore, the S-PhCW transports particles not only efficiently but also stably. We anticipate this waveguide structure will be beneficial for the future lab-on-chip development (C)2012 Optical Society of America
An electrically tunable-focusing liquid crystal lens with a low voltage and simple electrodes
(2012-01-30)
Lin, Hung-Chun
;
Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
An electrically tunable focusing LC lens with a low voltage and simple planar electrodes is demonstrated. The inhomogeneous electric field of the LC lens without any hole-patterned-electrode is generated by using an embedded polymeric layer with a gradient distribution of dielectric constants (or relative permittivity). LC directors in the LC layer experience spatially inhomogeneous voltages even though a single voltage is applied to the planar electrodes. Such a LC lens has a low voltage (similar to 2.6 V-rms) and simple design of electrodes. The gradient distribution of dielectric constants of polymeric layer is discussed and the performance of the LC lens is investigated. The applications of such a LC lens are cell phones, webcam, and pico projectors. (C)2012 Optical Society of America
Operating method and circuit for low density parity check (LDPC) decoder
(2012-01-31)
Liu Chih-Hao
;
Liao Yen-Chin
;
Lee Chen-Yi
;
Chang Hsie-Chia
;
Hsu Yarsun
An operating method and a circuit for low density parity check (LDPC) decoders, in which original bit nodes are incorporated into check nodes for simultaneous operation. The bit node messages are generated according to the difference between the newly generated check messages and the previous check node messages. The bit node messages can be updated immediately, and the decoder throughput can be improved. The required memory of LDPC decoders can be effectively reduced, and the decoding speed can also be enhanced.
BPR1J-097, a novel FLT3 kinase inhibitor, exerts potent inhibitory activity against AML
(2012-01-31)
Lin, W-H
;
Jiaang, W-T
;
Chen, C-W
;
Yen, K-J
;
Hsieh, S-Y
BACKGROUND: Activating mutations of Fms-like tyrosine kinase 3 (FLT3) constitute a major driver in the pathogenesis of acute myeloid leukaemia (AML). Hence, pharmacological inhibitors of FLT3 are of therapeutic interest for AML. METHODS: The effects of inhibition of FLT3 activity by a novel potent FLT3 inhibitor, BPR1J-097, were investigated using in vitro and in vivo assays. RESULTS: The 50% inhibitory concentration (IC50) of BPR1J-097 required to inhibit FLT3 kinase activity ranged from 1 to 10 nM, and the 50% growth inhibition concentrations (GC(50)s) were 21 +/- 7 and 46 +/- 14 nM for MOLM-13 and MV4-11 cells, respectively. BPR1J-097 inhibited FLT3/signal transducer and activator of transcription 5 phosphorylation and triggered apoptosis in FLT3-driven AML cells. BPR1J-097 also showed favourable pharmacokinetic property and pronounced dose-dependent tumour growth inhibition and regression in FLT3-driven AML murine xenograft models. CONCLUSION: These results indicate that BPR1J-097 is a novel small molecule FLT-3 inhibitor with promising in vivo anti-tumour activities and suggest that BPR1J-097 may be further developed in preclinical and clinical studies as therapeutics in AML treatments. British Journal of Cancer (2012) 106, 475-481. doi: 10.1038/bjc.2011.564 www.bjcancer.com Published online 20 December 2011 (C) 2012 Cancer Research UK
pH-Sensitive Pegylated Cationic Lipid-DNA Complexes for Gene Delivery: Transfection Efficiency and Live Cell Imaging Studies
(2012-01-31)
Chan, Chia-Ling
;
Majzoub, Ramsey
;
Shirazi, Rahau S.
;
Liang, Keng-San
;
Ewert, Kai K.
Folding Thermodynamics of a Beta-Hairpin Peptide: A Theoretical Study
(2012-01-31)
Tsai, Min-Yeh
;
Yuan, Jian-Min
;
Teranishi, Yoshiaki
;
Lin, Sheng-Hsien
;
交大名義發表
High-Order Correlated Motion in Single-Molecule Human Adenylate Kinase 1
(2012-01-31)
Lin, Chien Y.
;
Huang, Jung Y.
;
Lo, Leu-Wei
;
光電工程學系
;
Department of Photonics
Effect of number of tube rows on the air-side performance of crimped spiral fin-and-tube heat exchanger with a multipass parallel and counter cross-flow configuration
(2012-01-31)
Pongsoi, Parinya
;
Pikulkajorn, Santi
;
Wang, Chi-Chuan
;
Wongwises, Somchai
;
機械工程學系
The air-side performance of crimped spiral fin and tube heat exchangers at high Reynolds number (3000-13,000) is investigated in this study. The test heat exchangers have a new type of multipass parallel and counter cross-flow water flow arrangement which is a combination of parallel cross-flow and counter cross-flow. The test samples are made from copper and aluminium with different number of tube rows (N-row = 2, 3, 4 and 5). The effects of number of tube rows and fin material on the heat transfer and friction characteristics are studied. The results show that no significant effect for either number of tube rows or fin materials on the heat transfer performance is found at high Reynolds number. In addition, the correlation of the air-side performances of this type of the heat exchangers at high Reynolds number is developed for industrial applications. (c) 2011 Elsevier Ltd. All rights reserved.