Browsing by Issue Date, starting with "2011-06-23"

Now showing 1 - 20 of 41035

PHYSICAL TRAINING SYSTEM
(2011-06-23)
Yang Bing-Shiang
;
Chen Ting-Sheng
;
Chou Sung-Wei
;
Wu Hsin-Tien
A physical training system is provided combining biomechanics and neurophysiological measurement for providing users with instant advisory feedback about adjustment to body movements of a user or parameter setting of a gymnastic apparatus for a training objective, especially for specific muscle groups, without incurring sports injuries.
Precoder/two-stage equaliser for block-based single-carrier transmission with insufficient guard interval
(2011-06-23)
Song, Y.
;
Fung, C. C.
;
Wong, K. T.
;
Meng, H.
;
Tseng, D. -F.
Proposed is a zero-inserting precoder and a two-stage linear equaliser, to shorten the guard interval in block-based single-carrier modulation. The first-stage equaliser consists of a linear single-tapper-subcarrier frequency-domain equaliser. The second-stage equaliser maximises the SINR, in the time-domain, based on the interference-plus-noise estimated from the zero-padded sub-intervals of the single-carrier modulation. This proposed scheme is applicable even without cyclic prefixing.
Release-time-based multi-channel MAC protocol for wireless mesh networks
(2011-06-23)
Jeng, Andy An-Kai
;
Jan, Rong-Hong
;
Li, Chi-Yu
;
Chen, Chien
;
資訊工程學系
The wireless mesh network (WMN) has been considered one of the most promising techniques for extending broadband access to the last mile. In order to utilize multiple channels to increase the throughput in WMNs, a variety of multi-channel MAC (MMAC) protocols have been proposed in the literature. In particular, the dedicated control channel (DCC) approach can greatly simply many design issues in multi-channel environments by using a common control channel to exchange control signals. On the other hand, it allows each sender-receiver pair to dynamically select a data channel for their data transmission in an on-demand matter. However, the common control channel would become a bottleneck of the overall performance. Besides, the selection of data channels would be highly related to the final throughput. In this paper, we propose a new MMAC protocol, named the release-time-based MMAC (RTBM) to overcome the control channel bottleneck and data channel selection problems in the DCC approach. The RTBM consists of three major components: (1) Control initiation-time predication (CIP); (2) Dynamic data-flow control (DDC); (3) Enhanced channel selection (ECS). The CIP can predict a proper initiation time for each control process to reduce control overhead. The DDC can dynamically adjust the flow of each data transmission to fully exploit the channel bandwidth. The ECS can achieve a higher reusability of data channels to further enhance the throughput. Simulation results show that the RTBM can substantially improve the throughput in both single-hop and multihop networks. (C) 2011 Elsevier B.V. All rights reserved.
LEAKY-WAVE ANTENNA CAPABLE OF MULTI-PLANE SCANNING
(2011-06-23)
Chang Rong-Yuan
;
Chen Fu-Chiarng
A leaky-wave antenna capable of multi-plane scanning is provided. The leaky-wave antenna includes a substrate, a first antenna series, a second antenna series and a plurality of control units. The first antenna series intersects with the second antenna series to share a predetermined antenna unit among many antenna units. A part of the antenna units is connected in series to extend from a first and a second transmission lines of the predetermined antenna unit to compose the first antenna series, and the other antenna units are connected in series to extend from a third and a fourth transmission lines of the predetermined antenna unit to compose the second antenna series. The control units control the transmission paths between the first to the fourth transmission lines and the antenna units, and switch a leaky beam to different scanning planes, wherein the leaky beam scans with frequency variation through the antenna units.
Vectors, Methods, Systems and Kits for Protein Purification
(2011-06-23)
Li Yaw-Kuen
;
Wu Yue-Jin
Disclosed herein are autocleaved peptide linkers for producing purified proteins. The autocleaved peptide linkers are inserted between a chitin binding protein (CBP) and a target protein to form a fusion protein. Upon expression of the fusion protein, it is allowed to pass a chitin matrix so that the CBP portion of the fusion protein may be bound with the chitin matrix, the peptide linker then undergoes auto-cleavage in a buffer solution at a pH value of about 5.5-7.5 to release the target protein. The chitin matrix may be regenerated with another buffer solution at a pH value of about 3-4, that is, to release the bound CBP and return to its unbound form. The chitin matrix may be reused for at least 6 times without losing its function.
DELAY OPTIMAL COMPRESSOR TREE SYNTHESIS FOR LUT-BASED FPGAS
(2011-06-23)
HUANG Juinn-Dar
;
Lu Jhih-Hong
;
Lin Bu-Ching
;
Jou Jing-Yang
A compressor tree synthesis algorithm, named DOCT, which guarantees the delay optimal implementation in LUT-based FPGAs. Given a targeted K-input LUT architecture, DOCT firstly derives a finite set of prime patterns as essential building blocks. Then, it shows that a delay optimal compressor tree can always be constructed by those derived prime patterns via integer linear programming (ILP). Without loss of delay optimality, a post-processing procedure is invoked to reduce the number of demanded LUTs for the generated compressor tree design. DOCT has been evaluated over a broad set of benchmark circuits. The DOCT reduces the depth of the compressor tree and the number of LUTs based on the modern 8-input LUT-based FPGA architecture.
BIOMEDICAL ELECTRIC WAVE SENSOR
(2011-06-23)
Chen Yu-Han
;
Chao Paul C.-P.
;
Liao Lun-De
;
Lin Chin-Teng
;
Chen Jian-Ting
A biomedical electric wave sensor includes a base, a central pole, a dry electrode, a case, and a plurality of ribs. When the central pole lowers down, the ribs radiate and expand outward to push aside the hair of a subject, and the dry electrode exposes from the case and contacts the skin of the subject to measure a physiological electric wave signal from the subject. The present invention may overcome the intervention problem caused by hair and achieve the measurement of biomedical electric wave signal.
Interactions of Silica Nanoparticles and Ionic Liquids Probed by High Pressure Vibrational Spectroscopy
(2011-06-23)
Chang, Hai-Chou
;
Hung, Tzu-Chieh
;
Chang, Shu-Chieh
;
Jiang, Jyh-Chiang
;
Lin, Sheng Hsien
Gel-like ionic liquid/nanosilica mixtures have been prepared with the addition of 10 wt % nanosilica to 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (EMI(+)TFSA(-)), but no changes in C-H spectral features of EMI(+)TFSA(-) were observed in the presence of nanosilica under ambient pressure. As the gel-like mixture of EMI(+)TFSA(-)/nanosilica was compressed, a new alkyl C-H band at ca. 3017 cm(-1) arose. This new spectral feature at ca. 3017 cm(-1) may be attributed to the structural reorganization of alkyl C-H groups induced by the interactions between ionic clusters and nanosilica. The imidazolium C-H bands display nonmonotonic shifts as the pressure is elevated. They blue shift slightly initially, but red shifts occur upon further increase of the pressure. The compression also leads to an increase in the relative intensity of the imidazolium C-H band at ca. 3105 cm(-1). This observation suggests that some associated species are switched to the isolated form due to the presence of nanosilica under high pressures. In contrast to EMI(+)TFSA(-)/nanosilica, the band frequencies and band shapes of 1-butyl-3-methylimidazolium (BMI(+)TFSA(-))/nanosilica are similar to those of pure BMI(+)TFSA(-). These results indicate that the length of alkyl C-H groups plays a nonnegligible role in isolated-associated equilibrium.
MICROFLUIDIC SYSTEM AND METHOD FOR CREATING AN ENCAPSULATED DROPLET WITH A REMOVABLE SHELL
(2011-06-23)
FAN SHIH-KANG
;
HSU YAO-WEN
;
CHEN CHIUN-HSUN
A microfluidic system for creating encapsulated droplets whose shells can be further removed comprises: two electrode plates and a spacing structure disposed between the two electrode plates. One of the electrode plates has three reservoir electrodes and a plurality of channel electrodes. The three electrodes are respectively used for accommodating a shell liquid, a core liquid, and a removing liquid which is able to remove the shell liquid. The channel electrodes are used for communicating droplets among the three reservoir electrodes. Via these arrangements, the microfluidic system can create a quantitative shell droplet and a quantitative core droplet, and then merge the shell and core droplets to form an encapsulated droplet. Moreover, the shell of the encapsulated droplet can be removed by mixing it with the removing liquid. This invention is further provided with a method for creating an encapsulated droplet with a removable shell.
Sub-wavelength structure layer, method for fabricating the same and photoelectric conversion device applying the same
(2011-06-23)
Chang Edward Yi
;
Sahoo Kartika Chandra
;
Lin Men-Ku
;
Lu Yi-Yao
;
Wang Sheng-Ping
The present invention relates to a method for fabricating a sub-wavelength structure layer, including: forming a metal film on a passivation layer, an n-GaN layer or a transparent conductive oxide layer; performing thermal treatment to form self assembled metal nano particles; using the metal nano particles as a mask to remove a partial area of the passivation layer, the n-GaN layer or the transparent conductive oxide layer to form a sub-wavelength structure of which the cross-sectional area increases along the thickness direction of the passivation layer, the n-GaN layer or the transparent conductive oxide layer; and removing the metal nano particles. In addition, the present invention further provides the obtained sub-wavelength structure layer and a photoelectric conversion device using the same.
POSITIONING METHOD AND COMMUNICATION SYSTEM USING THE SAME
(2011-06-23)
Lo Chi-Chung
;
Chang Che-Pin
;
Lee Yueh-Feng
;
Peng Chun-Hao
;
Kuo Sheng-Po
A communication system for supporting a positioning operation within a specific area includes a system server and a communication device. The system server receives training location data corresponding to m training locations, wherein m is a natural number greater than 1, and obtains a first set and a second set of parameters according to m sets of training location data respectively corresponding to m training locations by way of conversion. The communication device downloads a part or an entire of the first set and the second set of parameters from the system server, establishes a positioning function according to the downloaded part or entire of the first set and the second set of parameters, determines to-be-positioned location data of a to-be-positioned location, and substitutes the to-be-positioned location data into the positioning function to generate positioning result data corresponding to the to-be-positioned location of communication device.
Optical Reorientation and Trapping of Nematic Liquid Crystals Leading to the Formation of Micrometer-Sized Domain
(2011-06-23)
Usman, Anwar
;
Uwada, Takayuki
;
Masuhara, Hiroshi
;
應用化學系
;
應用化學系分子科學碩博班
We report on observation of optical reorientation of homogeneous nematic liquid crystals (LCs) thin slab of 4'-penthyl-4-cyanobiphenyl induced by a tightly focused nearinfrared laser beam. We found that for laser beam with intensity higher than 56 MW/cm(2) the optical reorientation unusually transforms to a new metastable domain, which grows with laser irradiation time up to a dimension much larger than that of the focal spot. The optically reoriented LCs with refractive index mismatch compared to the surroundings can act as a micrometer-sized "ghost particle", leading to the generation of optical trapping and manipulation of the optically reoriented LCs. By using confocal Raman microspectroscopy, we show that the dichroic ratio in the confined focal volume changes upon the domain formation with an increase in the total Raman intensity, indicating that microscopic depolarization leading to deorientation or nematic isotropic phase transition and possible microscopic densification takes place by the tightly focused laser beam.
Non-volatile domain nucleation and growth in multiferroic BiFeO(3) films
(2011-06-24)
Chen, Yi-Chun
;
Wang, Guang-Fu
;
Tai, Hsiang-Hua
;
Chen, Jhih-Wei
;
Huang, Yen-Chin
We have presented a systematical study of the domain nucleation and growth behaviors in multiferroic BiFeO(3) (BFO) films. Both the ferroelectric and the ferroelastic switching dynamics were investigated. Several environmental parameters, including the polarization orientations, the monodomain-like matrix, and the ordered domain walls as local boundaries, were well controlled by thin-film strain engineering through changing the vicinal angles of the substrates. The tip-based domain dynamics was studied by subsequent piezoresponse force microscope (PFM) imaging of the domain evolution under external voltage pulses. For the nanodomains written in the monodomain-like environment, the domain wall performed the thermal activated motion. The as-grown 71 degrees domain walls can act as pinning centers for the ferroelectric domain growth driven by low fields; moreover, ferroelastic nucleation near a 71 degrees domain wall will cause the deformation of the domain wall. The ferroelastic domain growth possessed relatively small activation fields, and therefore usually performed non-activated motion. This study revealed the effects of local environments on the dynamics forming nanoscale domains, and opened a pathway for applications in novel non-volatile functional devices.
Non-volatile domain nucleation and growth in multiferroic BiFeO3 films
(2011-06-24)
Chen, Yi-Chun
;
Wang, Guang-Fu
;
Tai, Hsiang-Hua
;
Chen, Jhih-Wei
;
Huang, Yen-Chin
We have presented a systematical study of the domain nucleation and growth behaviors in multiferroic BiFeO3 (BFO) films. Both the ferroelectric and the ferroelastic switching dynamics were investigated. Several environmental parameters, including the polarization orientations, the monodomain-like matrix, and the ordered domain walls as local boundaries, were well controlled by thin-film strain engineering through changing the vicinal angles of the substrates. The tip-based domain dynamics was studied by subsequent piezoresponse force microscope (PFM) imaging of the domain evolution under external voltage pulses. For the nanodomains written in the monodomain-like environment, the domain wall performed the thermal activated motion. The as-grown 71 degrees domain walls can act as pinning centers for the ferroelectric domain growth driven by low fields; moreover, ferroelastic nucleation near a 71 degrees domain wall will cause the deformation of the domain wall. The ferroelastic domain growth possessed relatively small activation fields, and therefore usually performed non-activated motion. This study revealed the effects of local environments on the dynamics forming nanoscale domains, and opened a pathway for applications in novel non-volatile functional devices.
Observation of Significant enhancement in the efficiency of a DSSC by InN nanoparticles over TiO(2)-nanoparticle films
(2011-06-24)
Wang, Tsai-Te
;
Raghunath, P.
;
Lu, Yun-Fang
;
Liu, Yu-Chang
;
Chiou, Chwei-Huawn
We have studied the effect of InN deposited over TiO(2) nanoparticle (NP) films on the performance of dye-sensitized solar cells (DSSCs) using N3 dye with I(-)/I(3)(-) electrolyte. A 10-20% increase in efficiency was observed for InN deposited, N3 sensitized 5-8.5 mu m thick TiO(2) films as compared to similar non-treated films. The deposition of InN was carried out in the temperature range of 573-723 K organometallic chemical vapor deposition (OMCVD). Spectral shifts and DFT calculations with a model anchoring group (R'COOH) both suggest binding of the N3 dye directly to both InN and the InN/TiO(2) sites. (C) 2011 Elsevier B.V. All rights reserved.
Observation of Significant enhancement in the efficiency of a DSSC by InN nanoparticles over TiO2-nanoparticle films
(2011-06-24)
Wang, Tsai-Te
;
Raghunath, P.
;
Lu, Yun-Fang
;
Liu, Yu-Chang
;
Chiou, Chwei-Huawn
We have studied the effect of InN deposited over TiO2 nanoparticle (NP) films on the performance of dye-sensitized solar cells (DSSCs) using N3 dye with I-/I-3(-) electrolyte. A 10-20% increase in efficiency was observed for InN deposited, N3 sensitized 5-8.5 mu m thick TiO2 films as compared to similar non-treated films. The deposition of InN was carried out in the temperature range of 573-723 K organometallic chemical vapor deposition (OMCVD). Spectral shifts and DFT calculations with a model anchoring group (R'COOH) both suggest binding of the N3 dye directly to both InN and the InN/TiO2 sites. (C) 2011 Elsevier B.V. All rights reserved.
Wide-field Rayleigh scattering imaging and spectroscopy of gold nanoparticles in heavy water under laser trapping
(2011-06-25)
Uwada, Takayuki
;
Sugiyama, Teruki
;
Masuhara, Hiroshi
;
應用化學系
;
應用化學系分子科學碩博班
We demonstrated wide-field Rayleigh scattering spectroscopy and imaging of gold nanoparticle trapping upon a focused near-infrared laser irradiation under dark-field illumination. The migration, trapping, and assembling behavior of gold nanoparticles were examined at single nanoparticle level at the focus spot and its surrounding area in heavy water. It is clarified that particle migration to the laser spot within the focal plane is not appreciable while scattering force drives the migration vertically along the direction of light propagation. The gradient force at the focus point and the scattering force are theoretically estimated to be 3.1 and 0.17 pN, which are consistent with the direct observation. Analysis of light scattering intensity fluctuation at the focus shows that three nanoparticles can be trapped at most, which is well supported by light scattering spectral measurement. The particle existence probability at the focus is estimated as a function of lateral distance from the focus, and is compared with numerically obtained photon pressure potential. (C) 2011 Elsevier B.V. All rights reserved.
Organic photosensitive optoelectronic device
(2011-06-28)
Meng Hsin-Fei
;
Hong Sheng-Fu
;
Tseng Hsin-Rong
;
Chen En-Chen
;
Chu Chia-Hung
An organic photosensitive optoelectronic device includes an anode, an organic photosensitive layer formed on the anode and having a donor portion and an acceptor portion, a hole blocking layer formed on the organic photosensitive layer so as for the organic photosensitive layer to be sandwiched between the anode and the hole blocking layer, and a cathode formed on the hole blocking layer so as for the hole blocking layer to be sandwiched between the cathode and the organic photosensitive layer. The highest occupied molecular orbitals (HOMO) of the hole blocking layer is at least 0.3 eV higher than that of the donor portion. Therefore, the optoelectronic device efficiently suppresses dark current so as to enhance sensitivity when applied to a detector.
DEREVERBERATION AND NOISE REDUCTION METHOD FOR MICROPHONE ARRAY AND APPARATUS USING THE SAME
(2011-06-30)
Bai Mingsian R.
;
Hur Ker-Nan
;
Liou Ying-Ting
A dereverberation and noise reduction method adapted for a microphone array and an apparatus using the same are proposed. The microphone array receives a plurality of audio signals from an audio source. The dereverberation and noise reduction method includes the following steps. The received audio signals are processed by a beamforming processing, and a first audio signal is generated. Besides, the received audio signals are processed by a suppression processing, and a suppression audio vector is generated. Further, suppression audio vector is processed by an adaptive filtering processing, and a second audio signal is generated. In addition, the second audio signal is subtracted from the first audio signal to acquire an audio output signal, where parameters of the adaptive filtering processing are adjusted according to a feedback of the audio output signal.
High Electron Mobility Transistor and Method for Fabricating the Same
(2011-06-30)
Chang Edward Yi
;
Kuo Chien-I
;
Hsu Heng-Tung
A high electron mobility transistor includes a substrate, a buffer layer, a channel layer, a spacer layer, a schottky layer and a cap layer. The buffer layer is formed on the substrate. The channel layer is formed on the buffer layer, in which the channel layer comprises a superlattice structure formed with a plurality of indium gallium arsenide thin films alternately stacked with a plurality of indium arsenide thin films. The spacer layer is formed on the channel layer. The schottky layer is formed on the spacer layer. The cap layer is formed on the schottky layer.