Browsing by Issue Date, starting with "2004-06-16"

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全球資訊網連線切換方法
(2004-06-16)
曾建超
;
謝明燈
;
蔡清松
本發明全球資訊網連線切換方法，至少包含下列步驟：註冊／登錄步驟、記錄網頁／瀏覽步驟、選擇交遞步驟與交遞網頁與狀態步驟。藉由前述步驟，使用者可以先後使用多個用戶端設備在代理伺服器註冊與瀏覽網站後，將已註冊的瀏覽連線切換到一個新註冊或已註冊的用戶端設備；對於不支援設備能力與喜好設定概況檔(CC／PP)的全球資訊網瀏覽器，本發明亦可以讓使用者使用各種不同能力的設備透過代理伺服器來瀏覽全球資訊網網站，代理伺服器並且可以根據使用者的設備能力與喜好設定來向支援設備能力與喜好設定概況檔(CC／PP)之網站取得不同版本的網頁。
一種利用非晶矽及氧化層堆疊形成奈米級超淺接面之製程
(2004-06-16)
雷添福
;
張子云
;
溫凰君
本發明提供一種奈米級MOS技術中之超淺接面的形成方法，使用習知的離子佈植及快速退火技術，但無需低能量佈植機。離子透過一非晶矽覆蓋層植入接面而進行DIA(Diffusionfromimplantedamorphoussilicon，由植入的非晶矽而擴散)；在退火時，此非晶矽層則成為一表面固態擴散源。在非晶矽層下沉積一層薄氧化層作為蝕刻阻擋層。這種非晶矽–氧化物的雙層結構能輕易除去非晶矽層，並提供良好的製程控制與元件可靠度。利用非晶矽層作為擴散源而形成接面，可以減少佈植所造成的缺陷，形成無缺陷的超淺接面。
傳送和包裝訊號的數位編碼方法與結構
(2004-06-16)
劉啟民
;
李文傑
一種數位編碼的方法，將輸入音訊轉換成頻率樣本序列，以代表該音訊的一種頻譜合成；並且根據一種位元分配程序，將此頻率樣本序列量化成量化值。藉由一個遮罩門檻值，此位元分配程序利用一個參數預估器來預估量化參數。此量化值被編碼成包含複數個位元的已編碼資料。如果此已編碼資料的位元數超過此已編碼資料的一個預定的可用位元數，則一個反覆比率控制迴圈會調整量化參數和量化間隔大小。在量化頻率樣本序列之前，此方法也會根據一個砍除頻率，將輸入音訊的高頻率分量砍除，此砍除頻率是由反覆比率控制迴圈來決定的。
全二値表現によるモーション推定のための方法および装置
(2004-06-17)
羅正弘
;
李鑑明
;
王俊能
;
蒋迪豪
【課題】ビデオエンコードのための全二値表現によるピラミッド構造に基づくモーション推定手段を提供する。【解決手段】ビデオエンコードのためのモーション推定の方法は、３つの二値層を有する二値ピラミッド構造を構築する。状態更新モジュールが、最後のモーションベクタのリピートの発生を登録および更新し、静止状態チェッキングモジュールが、リピートの発生に基づき方法が静止モードかノーマルモードかを決定する。ノーマルモードでは、最初の二値層は、最初のレベルのモーションベクタを決定するために±３のピクセルリファインウィンドウ内をサーチする。サーチ範囲内のあらゆる点をチェックすることにより第二の二値層サーチは第二のレベルのモーションベクタを生成する。±２ピクセルのリファインウィンドウ内の第三の二値層サーチは、第二のレベルのモーションベクタに従って最後のモーションベクタを生成する。【選択図】図１
Applications of multidirectional asymmetrical microlens-array light-control films on reflective liquid-crystal displays for image quality enhancement
(2004-06-20)
Huang, YP
;
Shieh, HPD
;
Wu, ST
;
光電工程學系
;
Department of Photonics
The multidirectional asymmetrical microlens-array light-control film (MAMA-LCF) is developed for enhancing the image brightness and contrast ratio of various reflective liquid-crystal displays. By use of index-matching material, the interface reflection is greatly reduced. Through optimized designs, the surface-scattering effect is also suppressed; thus the contrast ratio is much enhanced. From experimental results, the MAMA-LCF leads to a similar to1.5x gain in brightness over the MgO standard white and a 15:1 contrast ratio for the reflective color super-twist nematic liquid-crystal display, 2.8x MgO and a 23:1 contrast ratio for the polymer-dispersed liquid-crystal, and 2.8x MgO and a 13:1 contrast ratio for the cholesteric liquid-crystal display. Potential applications of this low-cost plastic thin film for reflective liquid-crystal displays are foreseeable. (C) 2004 Optical Society of America.
On spherically symmetric solutions of the relativistic Euler equation
(2004-06-20)
Hsu, CH
;
Lin, SS
;
Makino, T
;
應用數學系
;
Department of Applied Mathematics
This work investigates the spherical symmetric solutions of more realistic equation of states. We generalize the method of Hsu et al. (Methods Appl. Anal. 8 (2001) 159) to show the existence of spherical symmetric weak Solution of the relativistic Euler equation with initial data containing the vacuum state. (C) 2004 Elsevier Inc. All rights reserved.
在視訊影像編碼中作為動態預測的裝置與方法
(2004-06-21)
王俊能
;
羅正弘
;
蔣迪豪
;
李鑑明
一種在視訊影像編碼中作為動態預測的方法，此方法建構了一種備有三階二元值層的金字塔型結構。在這個基於三階二元值層的金字塔型結構的動態預測法中，狀態更新模組之暫存器儲存最終的運動向量的重覆出現次數。穩態查核模組根據此重覆出現次數來決定本方法是在穩態模式或是在正常模式。在正常模式裡，第一階二元值層是在一±3像素之精調視窗內來執行此搜尋，以決定一第一階運動向量。在第二階二元值層裡，搜尋範圍是根據6個候選的運動向量計算出來的。藉由查核搜尋範圍裡的每個點，第二階二元值層的搜尋產生了一第二階運動向量。最後，在第三階二元值層中±2像素之精調視窗內，根據第二階二元值層所獲得之運動向量，產生了一最終的運動向量。在穩態模式裡，細調模組在±1像素之精調視窗內執行搜尋，並且產生了一最終的運動向量。
低溫多晶矽薄膜電晶體主動層之雷射再結晶方法
(2004-06-21)
葉清發
;
陳添富
;
羅正忠
本發明係一種低溫多晶矽薄膜電晶體主動層之雷射再結晶方法，其係利用具單一方向性之乾式蝕刻在薄膜電晶體主動層側壁覆蓋一間距矽(poly–spacer)，該間距矽(poly–spacer)提供了一雷射側向再結晶機制與可防止雷射再結晶後主動層微縮或剝落現象，可使通道內之矽晶粒變大但不需額外光罩，如此同時提升元件特性、提高元件均勻度與節省製程成本，此技術在現今低溫多晶矽薄膜電晶體(LTPS–TFTs)領域中將會是一項關鍵技術。
低溫沉積氧化層的方法
(2004-06-21)
葉清發
;
陳柏翰
;
王碩晟
;
徐中玓
一種低溫沉積氧化層的方法，在利用液相沉積氧化層之前先使用臭氧處理，以於基板表面成長原生氧化層，再沉積液相氧化層，並且可以於氧化層形成後施以電漿退火處理，可獲得高品質氧化膜，而所有製程均可在室溫下進行。
用於記憶體為基礎之維特比解碼器的演算法
(2004-06-21)
李鎮宜
;
林建青
;
吳家徹
本發明係揭露一種用於記憶體為基礎之維特比解碼器的演算法。利用回溯路徑的相依性質可以發現前後兩個回溯路徑隨著愈低的資料錯誤率會有更高的相似度。因此本發明之演算法將前一次的回溯路徑有至暫存器中，當目前之回溯路徑與前一次路徑相同時，即可得到欲求之路徑，並可停止記憶體讀取的動作，以大幅降低讀取記憶體所消耗之功率；且在回溯路徑之前，係可利用最小的路徑權值與路徑必為連續之特性來進行路徑預測的動作。本發明係利路徑匹配與路徑預測機制可以降低記憶體存取次數與功率消耗。
Manufacturing method and apparatus of fiber coupler
(2004-06-24)
Sien, Chi
;
Shiao-Min, Tseng
;
Nan-Kuang, Chen
A manufacturing apparatus and method of a fiber coupler is provided. A movable electric arc is employed to fuse more than two stacked fibers for manufacturing a fiber coupler having a small size and good environment stability. It is advantageous that the fiber coupler can be used in a SDH (Synchronous Digital Hierarchy) communication system, and the method also be used to manufacture the all-fiber CWDM (Coarse Wavelength Division Multiplexing) multiplexer which covers the E-band wavelengths and the sub-components of the OADM (Optical Add/Drop Multiplexer). And, all these functions are difficult to be achieved by the conventional techniques.
Ultrabroadband terahertz field detection by proton-bombarded InP photoconductive antennas
(2004-06-28)
Liu, TA
;
Tani, M
;
Nakajima, M
;
Hangyo, M
;
Sakai, K
Photoconductive ( PC) antennas fabricated on InP bombarded with 180 keV protons of different dosages (InP:H+) all exhibit a useful bandwidth of about 30 THz, comparable to that of the LT-GaAs PC antenna. The peak signal current of the best InP: H+ device (dosage of 10(15) ions/cm(2)) is slightly higher than that of the LT-GaAs one, while the signal-to-noise ratio (SNR) of the former is about half of that of the latter due to lower resistivity. This suggests that InP: H+ can be a good substrate for THz PC antennas with proper annealing and/or implantation recipe. (C) 2004 Optical Society of America.
Sensitivity of complete bandgaps to the shift of movable dielectric rod in two-dimensional photonic crystals with complex lattices
(2004-06-30)
Liu, WL
;
Yang, TJ
;
Gu, BY
;
電子物理學系
;
Department of Electrophysics
Two-dimensional tunable photonic crystals (TPCs) with movable components are proposed, which consist of a circular dielectric rod inserted into a square lattice of square dielectric cylinders in air. The band gap structures of TPCs can be tuned by adjusting the shift of the position of the circular rod in each unit cell. Band gap structures are calculated with the use of the plane-wave expansion method for various structural parameters, such as different filling fractions, ratio of the radius of the circular rod to the side-length of the square cylinder, different shifts or shifting orientations of the circular rod, etc. We find that there is a region of parameters in which the ratio of the gap width to the midgap is insensitive to the shift of the position of the circular dielectric rod. It is anticipated that the proposed TPC may become a favourable candidate of PCs owing to the benefit of facilitating fabrication, allowing a large tolerance.
The growth morphology and crystallinity of electroless NiP deposition on silicon
(2004-06-30)
Tsai, TK
;
Chao, CG
;
材料科學與工程學系
;
Department of Materials Science and Engineering
The growth morphology and crystallinity of the electroless NiP deposited on Si substrate pretreated by SnCl(2)/HCl and PdCl(2)/ HCl solutions is studied using transmission electron microscope (TEM), field emission scanning electron microscope (FESEM), and energy dispersive X-ray spectrum (EDS). Combining cross-sectional and surface observations show that the reaction mechanism of electroless NiP on Si is an electrochemical mechanism and the deposits are composed of a columnar structure grown along the vertical direction of the substrate surface. The phosphorus content does not have influence on the growth morphology but affects the crystallinity of the deposits. The crystallinity of the deposits is directly observed by the lattice image using high-resolution transmission electron microscope (HRTEM). The as-deposited NiP with 10.7 at.% P possesses good crystallinity and consists of Ni nanocrystal about 4-8 nm distributed randomly in the deposits. The size of nanocrystal in the deposits with 15.2 at.% P is about 2-5 nm. The deposits with 20.3 at.% P have a smaller order range and the size of nanocrystal is under 1.5 nm. The grain size decreases as the phosphorus content increases. (C) 2004 Elsevier B.V. All rights reserved.
Electromigration and integration aspects for the copper-SiLK system
(2004-07-01)
Tseng, HS
;
Chiou, BS
;
Wu, WF
;
Ho, CC
;
電子工程學系及電子研究所
In this study, the thermal characteristics and electromigration (EM) resistance of two dielectrics, SiLK(TM) and SiO2, are investigated to evaluate the feasibility of low dielectric-constant SiLK for intermetal. dielectric applications. Liftoff patterning was employed to fabricate the Cu interconnect for the EM test, and the Taguchi method was used in the experimental design to identify the key parameters for a successful liftoff. It was shown that the thermal impedance of the metal lines passivated with SiLK is 14% higher than that of metal lines passivated with SiO2. On the basis of the thermal impedance and temperature rise of the interconnect, it was concluded that the major heat transfer path is via the underlayer dielectric to the Si substrate. The activation energy of EM for Cu passivated with SiLK is smaller, and the EM lifetime is shorter than that of Cu passivated with SiO2. Possible mechanisms are discussed.
Formation of semiconductor quantum rings using GaAs/AlAs partially capped layers
(2004-07-01)
Lee, BC
;
Lee, CP
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A new method for fabricating semiconductor quantum rings has been developed. Instead of using the conventional GaAs cap layer, we used the GaAs/AlAs cap layer for the ring formation. The additional AlAs layer impedes the inward diffusion of the Ga and Al atoms and results in nicely formed ring structures with a more relaxed growth condition. Because of this layer, the ring-shaped structure can be maintained with a higher annealing temperature without being washed out by the intermixing of Ga/Al with In in the central region of the dots. The shape and the strain distribution of quantum rings have also been characterized by transmission electron microscopy.
Suppression of buoyancy-driven vortex flow resulting from a low speed jet impinging onto a heated disk in a vertical cylinder by cylinder top tilting
(2004-07-01)
Hsieh, JC
;
Cheng, CW
;
Lin, TF
;
機械工程學系
;
Department of Mechanical Engineering
Buoyancy-driven vortex flow resulting from a low speed round gas jet impinging vertically downwards onto a heated horizontal circular disk confined in an adiabatic vertical cylindrical chamber can be strong and even unstable as the buoyancy-to-inertia ratio exceeds certain critical level. An experiment combining flow visualization and temperature measurement is conducted in the present study to explore the suppression of the above buoyancy-driven vortex gas flow by inclining the top of the cylindrical chamber. The chamber top is chosen to incline linearly in the radial direction so that the mean flow in the wall-jet region is accelerated and meanwhile the effective buoyancy signified by the local Rayleigh number reduces in that direction. Specifically, in the present experiment. the disk-to-chamber top separation distance decreases from 20.0 mm at the jet axis to 10.0 mm at the chamber side. Tests are conducted for the jet flow rate varied from 1.0 to 5.0 slpm (standard liter per minute) and the jet-to-disk temperature difference varied from 0 to 35.0 degreesC for two injection pipes with diameter 10.0 and 22.1 mm for the chambers with horizontal and inclined tops. The results from the flow visualization indicate that the chamber top inclination can effectively suppress the unstable buoyancy-induced vortex roll and the temporal flow oscillation at high buoyancy-to-inertia ratios. However, the effects of the chamber top inclination on the inertia-driven rolls are much milder. The non-monotonic air temperature distribution in the radial direction is found to result from the unique vortex flow structure in the chamber. A universal criterion based on the local flow and thermal conditions in the wall-jet region for the onset of the buoyancy-driven roll is proposed. To quantify the characteristics of the vortex flow in the chamber with the inclined top, empirical correlations have been proposed for the size and location of the vortex rolls. (C) 2004 Elsevier Ltd. All rights reserved.
Memory properties of metal/ferroelectric/semiconductor and metal/ferroelectric/insulator/semiconductor structures using rf sputtered ferroelectric Sr0.8Bi2.5Ta1.2Nb0.8O9 thin films
(2004-07-01)
Huang, CH
;
Wang, YK
;
Lue, HT
;
Huang, JY
;
Lee, MZ
Off-axis rf magnetron sputtering has been employed to grow Sr0.8Bi2.5Ta1.2Nb0.8O9 (SBTN) ferroelectric thin films with (115) preferred orientation on SiO2/Si and Si substrates. The lower temperature and the higher oxygen mixing ratios [OMR, O-2/ (Ar+O-2)] used in film processing lead to reduction in the leakage current densities and widening the memory window of the resultant metal-ferroelectric-insulator semiconductor (MRS) structures. The maximum memory windows of the MFIS structures based on 40% OMR SBTN films deposited at 500 degreesC on SiO2/Si substrate are 2.87 and 2.27 V at the bias amplitudes of 10 and 8 V, respectively. With increasing applied voltage, the memory window also increases. The memory window decreases from 2.27 to 1.59 V after the 10(11) switching cycles at a bias amplitude of 8 V. The capacitance difference, DeltaC, between the two states decreases by 48% after retention time of 7000 s. (C) 2003 Elsevier Ltd. All rights reserved.
Fuzzy optimization techniques applied to the design of a digital PMSM servo drive
(2004-07-01)
Cheng, KY
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a novel design approach by applying gradient optimization with fuzzy step-sizing techniques to the design of a digital permanent magnet synchronous motor (PNSM) servo drive. The servo specifications and design variables are specified and analyzed to formulate a controller optimization problem. The servo responses are then fed back to evaluate the overall system performances, which can be expressed as objective functions with respect to the servo control parameters. According to the objective functions and design specifications, the servo control parameters can be properly tuned toward their optimal values by using the proposed optimization techniques. In order to improve the convergent rate of the optimization process, a fuzzy-logic based step-size tuning strategy is presented. Because of the nonlinear property of the digital servo drives, the tuned servo control parameters may be only optimal for a particular operating point, therefore, once the optimum design is achieved, the proposed fuzzy optimizing controller can perform as an intelligent tuner for on-line gain adaptation under different loading conditions. The proposed fuzzy optimization servo tuner has been realized under a PC-MATLAB-based environment with an on-line controlled digital PMSM servo drive. Simulation and experimental results indicate that the control parameters of a digital PMSM servo drive can be optimized for its dynamic responses under various load conditions.
控制包覆磁性材料之碳基奈米結構製程
(2004-07-01)
郭正次
;
林兆焄
;
駱安亞
;
駱伯遠
本發明係一種控制包覆磁性材料之碳基奈米結構製程，係以電子迴旋共振微波電漿沉積法(化學氣相沉積法)，成長包覆磁性材料之碳奈米結構及其後處理時，施以適當的磁場以改進磁性異向性；並以表面具有觸媒和添加物之基材通以直流偏壓源及加熱，做電漿前處理使進行基材表面蝕刻，再使反應氣體進行化學氣相沉積；藉此，達到控制奈米結構材料之尺寸、形狀、形成具方向性排列成長之奈米結構，可有效提高磁記憶媒體之紀錄密度，並具保護隔離效果以避免相互干擾，而且具磁異方性和矯頑磁力高的效果。