Browsing by Issue Date, starting with "2006-07-16"

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具低壓差動訊號（LVDS）與低擺幅差動訊號（RSDS）規格之平面顯示器高速輸入輸出緩衝器
(2006-07-16)
柯明道
;
莊凱嵐
本發明提供一種具低壓差動訊號(LUDS)與低擺幅差動訊號(RSDS)規格之平面顯示器高速輸入輸出緩衝器，其係將運用於平面顯示器系統介面的低電壓差動訊號傳輸規格與更小擺幅差動訊號傳輸規格之輸入輸出緩衝器整合於同一輸入輸出緩衝器電路中，且此輸入輸出緩衝器的資料傳輸速度可以到達1.2 Gb/s，其可以支援解析度為UXGA(1600×1200像素)的平面顯示器。因此本發明提供一種輸入輸出緩衝器可適用於兩種標準傳輸介面的，不但可節省電路面積，更可在高速資料傳輸下運作，並且其在睡眠模式下可節省電源的消耗。
Study of void formation due to electromigration in flip-chip solder joints using Kelvin bump probes
(2006-07-17)
Chang, Y. W.
;
Liang, S. W.
;
Chen, Chih
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Kelvin bump probes were fabricated in flip-chip solder joints, and they were employed to monitor the void formation during electromigration. We found that voids started to form at approximately 5% of the failure time under 0.8 A at 150 degrees C, and the bump resistance increased only 0.02 m Omega in the initial stage of void formation. Three-dimensional simulation was performed to examine the increase in bump resistance at different stages of void formation, and it fitted the experimental results quite well. This technique provides a systematic way for investigating the void formation during electromigration. (c) 2006 American Institute of Physics.
High-resolution intelligent rotor machine diagnostic system and method
(2006-07-18)
Bai
;
Ming-Sian
;
Hung
;
Ming-Hung
;
Huang
The present invention relates to a smart system and method of performing high-resolution frequency order analysis/diagnosis on rotor, in which such system is characterized in that capable of performing order analysis via a Kalman filter or a RLS (Recursive Least Square) algorithm while determining the failure status based on the Fuzzy theory. The smart system of present invention comprises a data acquisition means, a bench data setup means, a STFT time-spectra analysis/re-sampled order tracking means, a Kalman filter or RLS algorithmic means, a fuzzy diagnosis means and a window interface (e.g., GUI) while repeatedly making use the functions of those means so as to achieve the real-time diagnosis on rotor.
繆思的星期五文學沙龍11
(2006-07-19)
本報訊
5.2 GHz SiGe HBT upconverter using active-inductor LC current mirror
(2006-07-20)
Wu, T. -H.
;
Meng, C.
;
Wu, T. -H.
;
電信工程研究所
;
Institute of Communications Engineering
A compact 5.2 GHz upconversion micromixer using the 0.35 mu m SiGe HBT technology is demonstrated. A bandpass and area-saving LC current mirror using the active inductor is incorporated to increase the conversion gain. The demonstrated upconverter has conversion gain of -3.5 dB, OP(1dB) of -10 dBm, and O1P(3) of 0 dBm.
繆司的星期五文學沙龍11
(2006-07-20)
本報訊
Prevention and amelioration of acetaminophen toxicity with tea melanin
(2006-07-20)
Huang, Guewha Steven
The present invention relates to a method for preventing and/or reducing the toxicity of acetaminophen which comprises administering to a mammal an amount of tea melanin before or simultaneous with dosage of acetaminophen, a pharmaceutical composition containing tea melanin, and a pharmaceutical composition containing tea melanin and acetaminophen for preventing and/or reducing the toxicity of acetaminophen.
Application of SiO2-poly(dimethylsiloxane) hybrid material in the fabrication of amperometric biosensor
(2006-07-21)
Ho, Wei-Jen
;
Yuan, Chiun-Jye
;
Reiko, Ohara
;
生物科技學系
;
Department of Biological Science and Technology
Silica xerogel was widely used in the development of biosensors by coupling the desired biological components to various transducers. Unfortunately, the application of xerogels is limited due to their poor mechanical properties and poor structural maintenance of entrapped biomaterials. In this study, the availability of poly(dimethylsiloxane) (PDMS)-modified silica sol-gel (TEOS/PDMS Ormosil) glass in the immobilization of enzymes and its application in the fabrication of amperometric biosensor was investigated. We demonstrated that most of activity of encapsulated horseradish peroxidase can be preserved in PDMS-modified SiO2 glass compared with conventional silica xerogel. The synthesized monoliths exhibited high transparency and crack-free. The enzyme electrode based on glucose oxidase encapsulated TEOS/PDMS Ormosil glass on Pd electrode was fabricated and characterized electrochemically. The characteristics of the biosensor were studied by cyclic voltammetry and chronoamperometry. The biosensor exhibited a series of good properties: high sensitivity (1.63 mu A mM(-1) analyte), short response time and high reproducibility. The results indicate that TEOS/PDMS Ormosil glass has great potential to the immobilization of biomaterials as well as the fabrication of biosensors. (c) 2006 Elsevier B.V. All rights reserved.
Dibenzothiophene/oxide and quinoxaline/pyrazine derivatives serving as electron-transport materials
(2006-07-21)
Huang, Tai-Hsiang
;
Whang, Wha-Tzong
;
Shen, Jiun Yi
;
Wen, Yuh-Sheng
;
Lin, Jiann T.
A series of 2,8-disubstituted dibenzothiophene and 2,8-disubstituted dibenzothiophene-SS-dioxide derivatives containing quinoxaline and pyrazine moieties are synthesized via three key steps: i) palladium-catalyzed Sonogashira coupling reaction to form dialkynes; ii) conversion of the dialkynes to diones; and iii) condensation of the diones with diamines. Single-crystal characterization of 2,8-di(6,7-dimethyl-3-phenyl-2-quinoxalinyl)-5H-5 lambda(6)-dibenzo[b,d]thiophene-5,5-dione indicates a triclinic crystal structure with space group P1 and a non-coplanar structure. These new materials are amorphous, with glass-transition temperatures ranging from 132 to 194 degrees C. The compounds (Cpd) exhibit high electron mobilities and serve as effective electron-transport materials for organic light-emitting devices. Double-layer devices are fabricated with the structure indium tin oxide (ITO)/Qn/Cpd/LiF/Al, where yellow-emitting 2,3-bis[4-(N-phenyl-9-ethyl-3-carbazolylamino)phenyl]quinoxaline (Qn) serves as the emitting layer. An external quantum efficiency of 1.41 %, a power efficiency of 4.94 lm W-1, and a current efficiency of 1.62 cd A(-1) are achieved at a current density of 100 mA cm(-2).
Real-time human identification using a pyroelectric infrared detector array and hidden Markov models
(2006-07-24)
Fang, Jian-Shuen
;
Hao, Qi
;
Brady, David J.
;
Guenther, Bob D.
;
Hsu, Ken Y.
This paper proposes a real-time human identification system using a pyroelectric infrared ( PIR) detector array and hidden Markov models ( HMMs). A PIR detector array with masked Fresnel lens arrays is used to generate digital sequential data that can represent a human motion feature. HMMs are trained to statistically model the motion features of individuals through an expectation-maximization ( EM) learning process. Human subjects are recognized by evaluating a set of new feature data against the trained HMMs using the maximum-likelihood ( ML) criterion. We have developed a prototype system to verify the proposed method. Sensor modules with different numbers of detectors and different sampling masks were tested to maximize the identification capability of the sensor system. (c) 2006 Optical Society of America.
Improved luminance intensity of InGaN-GaN light-emitting diode by roughening both the p-GaN surface and the undoped-GaN surface
(2006-07-24)
Peng, Wei Chih
;
Wu, Yew Chung Sermon
;
材料科學與工程學系
;
Department of Materials Science and Engineering
The InGaN-GaN epitaxial films were grown by low-pressure metal-organic chemical vapor deposition on a sapphire substrate, and then the light-emitting diode (LED) with double roughened (p-GaN and undoped-GaN) surfaces was fabricated by surface-roughening, wafer-bonding, and laser lift-off technologies. It was found that the front side luminance intensity of double roughened LED was 2.77 times higher than that of the conventional LED at an injection current of 20 mA. The backside luminance intensity was 2.37 times higher than that of the conventional LED. This is because the double roughened surfaces can provide photons multiple chances to escape from the LED surface, and redirect photons, which were originally emitted out of the escape cone, back into the escape cone.
Control of the spin Hall current in two dimensional electronic gas
(2006-07-24)
Cheche, T. O.
;
Barna, E.
;
電子物理學系
;
Department of Electrophysics
The intrinsic spin Hall conductivity is obtained for a two-dimensional electronic gas (2DEG) in the presence of strain, Rashba coupling, and an external in-plane applied magnetic field. The conduction electrons of [001] oriented quantum well are used to model the 2DEG. The spin current value is dependent on the stress applied in direction [111].
Evaluating performance of post-tensioned steel connections with strands and reduced flange plates
(2006-07-25)
Chou, Chung-Che
;
Chen, Jun-Hen
;
Chen, Yu-Chih
;
Tsai, Keh-Chyuan
;
土木工程學系
The seismic performance of post-tensioned steel connections for moment-resisting frames was examined experimentally and analytically. Cyclic tests were conducted on three full-scale subassemblies, which had two steel beams post-tensioned to a concrete-filled tube (CFT) column with high-strength strands to provide recentring response. Reduced flange plates (RFPs) welded to the column and bolted to the beam flange were used to increase the dissipation of energy. Test results indicated that (1) the proposed buckling-restrained RFP could dissipate energy in axial tension and compression, (2) the subassemblies could reach an interstorey drift of 4% without strength degradation, and (3) buckling of the beam occurred towards an interstorey drift of 5%, causing a loss of the strand force, the recentring response, and the moment capacity. A general-purpose non-linear finite element analysis program (ABAQUS) was used to perform a correlation study. The behaviour of the steel beam under both post-tensioning and flexural loadings was compared to the test results and predictions. Copyright (C) 2006 John Wiley & Sons, Ltd.
Holder continuity for two-phase flows in porous media
(2006-07-25)
Yeh, Li-Ming
;
應用數學系
;
Department of Applied Mathematics
This work is to prove the Holder continuity of the solutions of the degenerate differential equations describing two-phase, incompressible, immiscible flows in porous media. The differential equations allow degeneracy at two end points and the assumption on mild degeneracy is not required in this study. The regularity result is proved by an alternative argument. Uniqueness of the weak solutions of the differential equations is a direct consequence from this Holder continuity. Copyright (C) 2006 John Wiley & Sons, Ltd.
Method for web content filtering
(2006-07-25)
Lin
;
Po-Ching
;
Lin
;
Ying-Dar
;
Liu
The present invention provides a method of web content filtering, which can be applied to gateway devices at client ends. When an access request for a web page from a browser is sent, by analyzing the web page content returned from the web site, we can decide whether the page is allowed or not, by early blocking and early bypassing algorithms. It allows making the decision as early as we have enough confidence that the web content should belong to some forbidden category or a normal one. Therefore, the web content determination speed can be improved and users' waiting time can be reduced. Moreover, by the present method, the network gateway devices will be allowed to analyze more web content.
Defect states investigation in poly(2-methoxy,5-(2 ' ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV)
(2006-07-26)
Nguyen, T. P.
;
Le Rendu, P.
;
Gaudin, O.
;
Lee, A. J. T.
;
Jackman, R. B.
in this study, application of the charge based Deep Level Transient Spectroscopy (Q-DLTS) has been extended to poly(2-methoxy,5-(2ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) single layer diodes, whose cathode consisted of aluminium and anode of indium tin oxide (ITO). The results reveal a broad Q-DLTS spectrum, with at least two maxima, consistent with a complex distribution of trap states. Only the Q-DLTS maximum with the shortest relaxation time could be fully resolved over the temperature range used here (100-300 K), yielding activation energies and capture cross sections in the ranges 0.3-0.4 eV and 10(-20) 10(-18) cm(2), respectively. It will be shown that this energy level is likely related to a majority-carrier (hole) trap, consistent with a Poole-Frenkel injection mechanism and p-type doping of the MEH-PPV film. The origin of the second (non-resolved) Q-DLTS peak will also be discussed. (c) 2005 Elsevier B.V. All rights reserved.
Sub-5-fs spectroscopy of a thiophene derivative with a quinoid structure
(2006-07-26)
Kobayashi, Takayoshi
;
Wang, Haibo
;
Wang, Zhuan
;
Otsubo, Tetsuo
;
電子物理學系
Sub-5-fs spectroscopy of a thiophene derivative with an electron donative and an acceptive moieties and quinoid structure provided the experimental evidence of dynamic mode coupling. It was shown that two out-of-plane bending modes mediate the dynamic mode coupling between 1469 and 1379 cm(-1) and between 1603 and 1469 cm(-1). These couplings are considered to be associated with geometrical relaxation relevant to the neutral bipolaron formation in all-s-trans polyacetylene. (c) 2006 Elsevier B.V. All rights reserved.
An adaptive bluetooth packet selection and scheduling scheme in interference environments
(2006-07-26)
Shih, Chen-Han
;
Wang, Kuochen
;
Shih, Hung-Cheng
;
資訊工程學系
;
Department of Computer Science
Bluetooth is a new technology for Wireless Personal Area Networks (WPANs). It intends to eliminate the need of wires and connectors between a variety of devices, like PCs and their peripherals, walkmans and their earphones, etc. Bluetooth provides robust and secure wireless radio communication of both data and voice, even when the devices are not within line-of-sight. Bluetooth employs the 2.4 GHz ISM band, sharing the same band with the Wireless LAN (WLAN) implementing the IEEE 802.11 series standard. While WLANs and WPANs are complementary rather than competing technologies, the likelihood of mutual interference may occur unexpectedly, which may impact the performance of either severely. In this paper, we propose a Bluetooth channel state dependent data segmentation and reassembly (CSD-SAR) scheme and a queue state dependent priority (QSD-PR) scheduling policy. The CSD-SAR maintains a receiving frequency table to predict channel conditions and selects the best packet type and packet size to transmit data. In this way, it not only masks bad frequencies without delaying transmission but also leads to the best performance with high link utilization in error-prone environments. In addition, the QSD-PR also uses the receiving frequency table to avoid bad frequencies and gives a selected master-slave pair, which has more queued data to send between each other, a higher priority to eliminate the wastage of slots. The conventional scheduling policy, Round Robin (RR), yields poor performance with the time division duplex based MAC protocol and results in slot wastage and may not ensure fairness. Simulation results show that our proposed scheme achieves better link utilization and higher throughput with bounded delay compared to the RR scheme in error-free and error-prone environments. Our scheme can also eliminate interference to other wireless networks that share the same spectrum, such as WLANs, by avoiding selecting channels occupied by other networks. (c) 2006 Elsevier B.V. All rights reserved.
Unified semiclassical theory for the two-state system: An analytical solution for general nonadiabatic tunneling
(2006-07-28)
Zhu, Chaoyuan
;
Lin, Sheng Hsien
;
應用化學系
;
應用化學系分子科學碩博班
;
Department of Applied Chemistry
Unified semiclasical solution for general nonadiabatic tunneling between two adiabatic potential energy surfaces is established by employing unified semiclassical solution for pure nonadiabatic transition [C. Zhu, J. Chem. Phys. 105, 4159 (1996)] with the certain symmetry transformation. This symmetry comes from a detailed analysis of the reduced scattering matrix for Landau-Zener type of crossing as a special case of nonadiabatic transition and nonadiabatic tunneling. Traditional classification of crossing and noncrossing types of nonadiabatic transition can be quantitatively defined by the rotation angle of adiabatic-to-diabatic transformation, and this rotational angle enters the analytical solution for general nonadiabatic tunneling. The certain two-state exponential potential models are employed for numerical tests, and the calculations from the present general nonadiabatic tunneling formula are demonstrated in very good agreement with the results from exact quantum mechanical calculations. The present general nonadiabatic tunneling formula can be incorporated with various mixed quantum-classical methods for modeling electronically nonadiabatic processes in photochemistry. (c) 2006 American Institute of Physics.
Confined breather-type excitation in a quinoidal thiophene after sub-5 fs pulse excitation
(2006-07-28)
Kobayashi, Takayoshi
;
Wang, Haibo
;
Wang, Zhuan
;
Otsubo, Tetsuo
;
電子物理學系
A quinoidal thiophene molecule which is a prototype of the repeated unit of s-trans-cis-polyacetylene was studied by sub-5 fs spectroscopy. A breatherlike mode modulation of both the amplitude and frequency of the C = C stretching was observed for the first time. It generates two sidebands of 2238 and 700 cm(-1) with a separation of 769 cm(-1) corresponding to the modulation frequency. The latter mode is very close to the C-S-C ring deformation, which indicate that this mode mediates coupling between the breather mode and the C-beta-C-beta stretching mode. It was also found that the breather-type excitation has a longer lifetime (2-3 ps) than in all-trans-polyacetylene (50 fs) due to its confinement. (c) 2006 American Institute of Physics.