Browsing by Issue Date, starting with "2005-06-16"

Now showing 1 - 20 of 66466

Method for web content filtering
(2005-06-16)
Lin, Po-Ching
;
Lin, Ying-Dar
;
Liu, Ming-Dao
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.
Genetic fuzzy logic controller: an iterative evolution algorithm with new encoding method
(2005-06-16)
Chiou, YC
;
Lan, LW
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
Logic rules and membership functions are two key components of a fuzzy logic controller (FLC). If only one component is learned, the other one is often set subjectively thus can reduce the applicability of FLC. If both components are learned simultaneously, a very long chromosome is often needed thus may deteriorate the learning performance. To avoid these shortcomings, this paper employs genetic algorithms to learn both logic rules and membership functions sequentially. We propose a bi-level iterative evolution algorithm in selecting the logic rules and tuning the membership functions for a genetic fuzzy logic controller (GFLC). The upper level is to solve the composition of logic rules using the membership functions tuned by the lower level. The lower level is to determine the shape of membership functions using the logic rules learned from the upper level. We also propose a new encoding method for tuning the membership functions to overcome the problem of too many constraints. Our proposed GFLC model is compared with other similar GFLC, artificial neural network and fuzzy neural network models, which are trained and validated by the same examples with theoretical and field-observed car-following behaviors. The results reveal that our proposed GFLC has outperformed. © 2004 Elsevier B.V. All rights reserved.
A fair scheduling algorithm with traffic classification for wireless networks
(2005-06-16)
Wang, YC
;
Ye, SR
;
Tseng, YC
;
資訊工程學系
;
Department of Computer Science
Wireless channels are characterized by more serious bursty and location-dependent errors. Many packet scheduling algorithms have been proposed for wireless networks to guarantee fairness and delay bounds. However, most existing schemes do not consider the difference of traffic natures among packet flows. This will cause the delay-weight coupling problem. In particular, serious queuing delays may be incurred for real-time flows. To resolve this problem, we propose a traffic-dependent wireless fair queuing (TD-FQ) algorithm that takes traffic types of flows into consideration when scheduling packets. The proposed TD-FQ algorithm not only alleviates queuing delay of real-time flows, but also guarantees bounded delays and fairness for all flows. (c) 2004 Elsevier B.V. All rights reserved.
視訊壓縮裝置與方法
(2005-06-16)
蔡尚軒
;
杭學鳴
;
蔡家揚
;
蔣迪豪
本發明係提供一種視訊壓縮裝置與方法，係結合移動補償之時間濾波技術以及內嵌式小波編碼，可達到壓縮量化誤差量、時間解析及空間解析之可調性，可達成移動資訊的資訊量可調性，用以改進小波視訊壓縮方法在低位元率的表現，而提出一個移動資訊分層編碼法，可將移動向量依其所代表的空間方塊大小或時間畫幅數或移動向量數值精準度分層編碼，並將移動向量分成多個層次，當視訊資料流需要調整時，只把需要的移動資訊放入最後的資料流，利用上述之方法，可以讓連續畫面小波視訊壓縮在低位元率的表現改進許多，而在高位元率時只損失一點壓縮比。
有機電激發光高分子化合物
(2005-06-16)
許千樹
;
黎安國
;
謝炳榮
;
李興銓
本發明係揭露一種以聚芳香烴乙烯(PPV)為主體之有機電激發光高分子，可解決習知因高分子溶解度不佳，造成加工製程上的不便，本發明係導入不同之烷氧類及環烷類或其基團，不僅可增加其高分子的溶解度，且因其所合成之聚芳香烴乙烯本身周圍的取代基團立體阻礙小，可聚合出具較高分子量之化合物，並具有足夠的成膜性以及高固態螢光量子效率，對於有機電激發光元件之應用上具有更高的實用價值。
Study of thermal stability of nickel monogermanide on single- and polycrystalline germanium substrates
(2005-06-20)
Hsu, SL
;
Chien, CH
;
Yang, MJ
;
Huang, RH
;
Leu, CC
We have investigated the thermal stability of nickel monogermanide (NiGe) films formed by rapid thermal annealing on both single- and polycrystalline Ge substrates. We found that the NiGe phase is the only one present after nickel germanidation in the temperature range 400-700 degrees C. A fairly uniform NiGe film formed on the single-crystalline Ge; it possessed excellent resistivity (15.6 mu Omega cm) and was thermally stable up to 550 degrees C, but it degraded rapidly at higher temperatures as a result of agglomeration. In contrast, the NiGe film formed on the polycrystalline Ge exhibited much poorer thermal stability, possibly because of polycrystalline Ge grain growth, which resulted in columnar NiGe grains interlaced with Ge grains that had a dramatically increased sheet resistance. As a result, we observed that the sheet resistances of NiGe lines subjected to annealing at 500 degrees C depended strongly on the linewidth when this width was comparable with the grain size of the polycrystalline Ge. (c) 2005 American Institute of Physic's.
Highly efficient top-emitting white organic electroluminescent devices
(2005-06-20)
Hsu, SF
;
Lee, CC
;
Hwang, SW
;
Chen, CH
;
應用化學系
We have developed highly efficient white top-emitting organic light-emitting devices with broad emission by modifying both the anode and cathode. To alleviate the undesirable microcavity effect and obtain "broad" white emission, a CFx-coated Ag anode and an index-matching layer (SnO2) capped on a thin Ca/Ag cathode with a maximum transparency of 80% were employed. A top-emitting broad white-light device, based on the dual-layer architecture of light blue and yellow emitters with one of the highest EL efficiencies of 22.2 cd/A (9.6 1m/W) at 20 mA/cm(2) and 7.3 V with Commission Internationale d'Eclairage coordinates of (x = 0.31, y = 0.47), has been demonstrated. (c) 2005 American Institute of Physics.
一種光強度與分波多工之光纖布拉格光柵感測系統
(2005-06-21)
祁甡
;
曾弘毅
;
彭朋群
;
林加和
一種光強度與分波多工之光纖布拉格光柵感測系統其包括一具有收發端部及感測端部之分光裝置、耦合於收發端部之光產生裝置及光接收裝置、複數耦合於感測端部且具有光纖布拉格光柵之感測光纖及一連接光接收裝置之資訊處理裝置，該分光裝置係將收發端部之光源以不同能量比例分配至感測端部，因此，由光產生裝置輸出之可調波長光訊號，經分光裝置以不同能量比例配置至感測光纖，而對應光波長之光柵係以不同能量比例反射光訊號，經光接收裝置擷取其能量資訊，並資訊處理裝置依光訊號能量比例決定感測結果，可形成光強度多工機制，提升感測容量。
Experimental and theoretical studies of rate coefficients for the reaction O(P-3)+CH3OH at high temperatures
(2005-06-22)
Lu, CW
;
Chou, SL
;
Lee, YP
;
Xu, SC
;
Xu, ZF
Rate coefficients of the reaction O(P-3)+CH3OH in the temperature range of 835-1777 K were determined using a diaphragmless shock tube. O atoms were generated by photolysis of SO2 with a KrF excimer laser at 248 nm or an ArF excimer laser at 193 nm; their concentrations were monitored via atomic resonance absorption excited by emission from a microwave-discharged mixture of O-2 and He. The rate coefficients determined for the temperature range can be represented by the Arrhenius equation, k(T)=(2.29 +/- 0.18)x10(-10) exp[-(4210 +/- 100)/T] cm(3) molecule(-1) s(-1); unless otherwise noted, all the listed errors represent one standard deviation in fitting. Combination of these and previous data at lower temperature shows a non-Arrhenius behavior described as the three-parameter equation, k(T)=(2.74 +/- 0.07)x10(-18)T(2.25 +/- 0.13) exp[-(1500 +/- 90)/T] cm(3)molecule(-1) s(-1). Theoretical calculations at the Becke-3-Lee-Yang-Parr (B3LYP)/6-311+G(3df,2p) level locate three transition states. Based on the energies computed with coupled clusters singles, doubles (triples) [CCSD(T)]/6-311+G(3df,2p)//B3LYP/6-311+G(3df,2p), the rate coefficients predicted with canonical variational transition state theory with small curvature tunneling corrections agree satisfactorily with the experimental observations. The branching ratios of two accessible reaction channels forming OH+CH2OH (1a) and OH+CH3O (1b) are predicted to vary strongly with temperature. At 300 K, reaction (1a) dominates, whereas reaction (1b) becomes more important than reaction (1a) above 1700 K. (c) 2005 American Institute of Physics.
[DOUBLE-TRIGGERED SILICON CONTROLLING RECTIFIER AND ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT THEREOF]
(2005-06-23)
Ker, Ming-Dou
;
Hsu, Kuo-Chun
A double-triggered silicon controller rectifier (SCR) comprises a plurality of N+ diffusion areas, a plurality of P+ diffusion areas, a first N-well region, a second N-well region and a third N-well region formed in a P-substrate. The N+ diffusion areas and the P+ diffusion areas are isolated by shallow trench isolation (STI) structures. Two of the N+ diffusion areas are N-type trigger terminals. Two of the P+ diffusion areas are the P-type trigger terminal.
Comment on "Formation of repetitively nanosecond spatial solitons in a saturable absorber Q-switched laser" - Reply
(2005-06-24)
Chen, YF
;
Huang, KF
;
電子物理學系
;
Department of Electrophysics
EXTRACTION OF CORONARY ARTERIAL TREE USING CINE X-RAY ANGIOGRAMS
(2005-06-25)
Lin, Chih-Yang
;
Ching, Yu-Tai
;
資訊工程學系
;
Department of Computer Science
An efficient and robust method for identification of coronary arteries and evaluation of the severity of the stenosis on the routine X-ray angiograms is proposed. It is a challenging process to accurately identify coronary artery due to poor signal-to-noise ratio, vessel overlap, and superimposition with various anatomical structures such as ribs, spine, or heart chambers. The proposed method consists of two major stages: (a) signal-based image segmentation and (b) vessel feature extraction. The 3D Fourier and 3D Wavelet transforms are first employed to reduce the background and noisy structures in the images. Afterwards, a set of matched filters was applied to enhance the coronary arteries in the images. At the end, clustering analysis, histogram technique, and size filtering were utilized to obtain a binary image that consists of the final segmented coronary arterial tree. To extract vessel features in terms of vessel centerline and diameter, a gradient vector-flow based snake algorithm is applied to determine the medial axis of a vessel followed by the calculations of vessel boundaries and width associated with the detected medial axis.
吃茶圖卷
(2005-06-28)
管管
Using a solution crystal growth method to grow arrays of aligned, individually distinct, single-crystalline TiO2 nanoneedles within nanocavities
(2005-06-28)
Weng, CC
;
Chen, CP
;
Ting, CH
;
Wei, KH
;
材料科學與工程學系
Preparation and properties of polyacrylate/clay photocured nanocomposite materials
(2005-06-28)
Wang, YY
;
Hsieh, TE
;
材料科學與工程學系
;
Department of Materials Science and Engineering
A functionalized surfactant, GME-N-C-10 containing a C=C double bond, was synthesized to modify clays such as montmorillonite (MMT) and mica for the preparation of organic-inorganic composite resins via radical photoinduced polymerization. As revealed by X-ray diffraction (XRD) analysis of the organophilic samples, the synthesized surfactant was successfully intercalated into the layers of clay by its full molecular length and such an intercalation generated a paraffin-like structure in the modified clays. By forming the C-C bonds between surfactants and oligomers/monomers during subsequent radical photoinduced polymerization, the hybrid comprising organophilic clay/oligomers/monomers became an intercalated nanocomposite resin. The thickness of the dispersed lamellae was less than 100 nm, as revealed by transmission electron microscopy (TEM). For the composite sample containing 5.0 wt.% of organophilic clay, the decomposition temperatures raised at least 15 degrees C; the transmittance detected by UV-visible spectrometer showed a less than 15% loss in the visible light region but a satisfactory transparency was still retained, and the degree of moisture absorption decreased from 3.4% to about 1% due to dispersive organophilic clay in the polymer matrix.
Highly efficient electrophosphorescent devices with saturated red emission from a neutral osmium complex
(2005-06-28)
Niu, YH
;
Tung, YL
;
Chi, Y
;
Shu, CF
;
Kim, JH
Highly efficient electrophosphorescent polymer light-emitting diodes (LEDs) with saturated red emission (Commission Internationale de L'Eclairage chromaticity coordinates exactly at x = 0.67, y = 0.33) are achieved by blending a novel neutral Osmium complex into a single-component bipolar polymer host that possesses balanced hole- and electron-transporting ability. By using a tetraphenylenebiphenyldiamine (TPD)-based cross-linkable hole-transport layer as well as a layer of 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBI) as an electron-tran sport layer, a device structure with both effective hole/electron injection and efficient carriers/excitons blocking or confinement at both electrode sides is constituted. In this way, external quantum efficiency 12.8% is reached the first time with an organometallic complex with heavy metal core other than iridium.
Band gap variation of size-controlled ZnO quantum dots synthesized by sol-gel method
(2005-06-30)
Lin, KF
;
Cheng, HM
;
Hsu, HC
;
Lin, LJ
;
Hsieh, WF
ZnO quantum dots were synthesized successfully via a simple sol-gel method. The average size of quantum dots can be tailored using well-controlled concentration of zinc precursor. Size-dependent blue shifts of photoluminescence and absorption spectra revealed the quantum confinement effect. The band gap enlargement is in agreement with the theoretical calculation based on the effective mass model. Furthermore, as the particle size decreases, we observed an increase in the size-dependent Stokes shift of the photoluminescence peak relative to the absorption onset. (c) 2005 Elsevier B.V. All rights reserved.
Sol-gel-derived Zn((1-x))Mg(x)O thin films used as active channel layer of thin-film transistors
(2005-07-01)
Lee, JH
;
Lin, P
;
Lee, CC
;
Ho, JC
;
Wang, YW
Sol-gel derived n-type Zn((1-x))Mg(x)O (x = 0-0.45) thin films and thin-film transistors (TFTs) with active channel layers made of the films were investigated. The films were prepared at 500 degrees C. The effects of Mg doping on the crystallinity, optical transparency, grain size, and charge-carrier concentration (n) of the films were examined. The Fermi level of the films, as derived from the temperature dependence of n, was similar to 0.12eV below the conduction band. The donor concentration and donor level (E(d)) were derived by a curve fitting method based on the electrical neutrality condition. Ed was found to be similar to 0.3 eV below the conduction band. The composition dependence of the TFT output characteristics was interpreted and correlated to the width of the depletion region adjacent to the grain boundaries. When the grains were almost depleted at x = 0.2, the TFT showed an enhancement mode and an on/off ratio of 10(6).
A convenient solver for solving optimal control problems
(2005-07-01)
Huang, CH
;
Tseng, CH
;
機械工程學系
;
Department of Mechanical Engineering
This paper focuses on the development of a solver for solving optimal control problems. A developed numerical optimal control module integrated with the Sequential Quadratic Programming method is introduced. An optimal control problem solver based on the proposed method is implemented to solve optimal control problems efficiently in engineering applications. In addition, a systematic procedure for solving optimal control problems by using the optimal control problem solver is also proposed. A time-optimal benchmark problem presented in the literature is used to illustrate for the capability and facility of solving optimal control problems. The numerical results demonstrate the proposed method and the procedure suggested in this paper are helpful to engineers in solving optimal control problems in a systematic and efficient manner.
A robust high-Q micromachined RF inductor for RFIC applications
(2005-07-01)
Lin, JW
;
Chen, CC
;
Cheng, YT
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, a robust micromachined spiral inductor with a cross-shaped sandwich membrane support is proposed and fabricated with fully CMOS compatible post-processes for radio frequency integrated circuit (RFIC) applications. Via the incorporation of a sandwich dielectric membrane (0.7 mu M SiO2/0.7 mu M Si3N4/0.7 mu m TEOS) to enhance the structure rigidity, the inductor can have better signal stability. In comparison, the new design of a similar to 5-nH micromachined inductor can have 45% less inductance variation than the one without the dielectric support while both devices are operated with 10 m/s(2) acceleration. Meanwhile, using a cross shape instead of blanket membrane can also effectively eliminate the inductance variation induced by the working temperature change (20 degrees C to 75 degrees C). The measurement results show the robust inductor can have similar electrical performance to the as-fabricated freely suspended inductor, which has five times Q (quality factor) improvement than the inductor without the substrate removal. It is our belief that the new micromachined inductors can have not only high-Q performance but also better signal stability suitable for wide-range RFIC applications.