Browsing by Issue Date, starting with "2004-05-14"

Now showing 1 - 20 of 70191

A nano-switch regulates the activity of redox-responsive phenol sulfotransferase
(2004-05-14)
Yang, YS
;
Su, TM
;
交大名義發表
;
National Chiao Tung University
Deep depletion phenomenon of SrTiO3 gate dielectric capacitor
(2004-05-15)
Liu, CY
;
Chen, BY
;
Tseng, TY
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
SrTiO3 (STO) thin films were deposited on p-type silicon substrate by radio-frequency (rf) magnetron sputtering in an Ar-O-2 and Ar-N-2 mixed ambient to form metal/insulator/semiconductor (MIS) structure. We found the Schottky emission and Fowler-Nordheim tunneling mechanisms as responsible for the leakage current in the STO-based MIS structures at low and high electric fields under negative bias voltage, respectively. On the other hand, it was also observed that the generation current dominated the leakage mechanism at the high electric field under positive bias voltage due to the highly leaky insulator and lack of electrons. To maintain the leakage current at the higher electric field, the depletion width would broaden to generate more electrons, which is called deep depletion. Therefore, deep depletion was induced by high leakage current density under positive bias voltage. We also investigated the correlation between deep depletion and the leakage mechanism in STO-based gate dielectric capacitors under positive bias voltage to extract the generation lifetime of silicon substrates. The extracted generation lifetime can be used to examine the quality of silicon substrates after different processing conditions. (C) 2004 American Institute of Physics.
The design of a novel complementary metal oxide semiconductor detection system for biochemical luminescence
(2004-05-15)
Lu, U
;
Hu, BCP
;
Shih, YC
;
Wu, CY
;
Yang, YS
We designed a complementary metal oxide semiconductor (CMOS) chip with accompanied accessories as a system for the detections and quantifications of biochemical luminescence. This is the first of such instruments that has been reported. The semiconductor chip was manufactured through a 0.25 mum CMOS standard process. A current mirror was designed in integrated circuit (IC) to amplify the signal current that was induced by chemiluminescence. Horseradish peroxidase (HRP)-luminol-H2O2 system was used as an example to constitute a useful platform for coupling to chemiluminescence reactions which produce H2O2. Glucose-glucose oxidase (GOD) reaction was coupled with HRP-luminol-H2O2 reaction to demonstrate the ability of the novel CMOS base instrument for quantifying the biological luminescence of a variety of valuable clinical assays. Our results illustrated that the combination of the specifically designed CMOS IC and commercially available electronic devices established a simple and useful bioanalytical tool. (C) 2003 Elsevier B.V. All rights reserved.
Impact of air filter material on metal oxide semiconductor (MOS) device characteristics in HF vapor environment
(2004-05-15)
Hsiao, CW
;
Lou, JC
;
Yeh, CF
;
Hsieh, CM
;
Lin, SJ
Airborne molecular contamination (AMC) is becoming increasingly important as devices are scaled down to the nanometer generation. Optimum ultra low penetration air (ULPA) filter technology can eliminate AMC. In a cleanroom, however, the acid vapor generated from the cleaning process may degrade the ULPA filter, releasing AMC to the air and the surface of wafers, degrading the electrical characteristics of devices. This work proposes the new PTFE ULPA filter, which is resistant to acid vapor corrosion, to solve this problem. Experimental results demonstrate that the PTFE ULPA filter can effectively eliminate the AMC and provide a very clean cleanroom environment.
Companion matrices: reducibility, numerical ranges and similarity to contractions
(2004-05-15)
Gau, HL
;
Pei, YW
;
應用數學系
;
Department of Applied Mathematics
In this paper, we study some unitary-equivalence properties of the companion matrices. We obtain a criterion for a companion matrix to be reducible and show that the numerical range of a companion matrix is circular disc centered at the origin if and only if the matrix equals the (nilpotent) Jordan block. However, the more general assertion that a companion matrix is determined by its numerical range turns out to be false. We also determine, for an n x n matrix A with eigenvalues in the open unit disc, the defect index of a contraction to which A is similar. (C) 2004 Elsevier Inc. All rights reserved.
Computerized tooth profile generation and analysis of characteristics of elliptical gears with circular-arc teeth
(2004-05-15)
Chen, CF
;
Tsay, CB
;
機械工程學系
;
Department of Mechanical Engineering
This study describes rack cutters with circular-arc profile teeth to generate elliptical gears which rotate about one of their foci. A mathematical model for elliptical gears with circular-arc teeth is developed according to gear theory. The influence of the design parameters, such as the number of teeth, gear module, pressure angle at the pitch point and the major-axis, are investigated. The effects of the circular-arc radius of the rack cutter on both the undercutting of teeth and on pointed teeth of the generated circular-arc elliptical gear are also studied. Three numerical examples are presented to elucidate the generation of gear tooth profiles using the proposed mathematical model, and to investigate the phenomena of tooth undercutting and pointed teeth. (C) 2003 Published by Elsevier B.V.
Characterization of the signature of subwavelength variation from far-field irradiance
(2004-05-15)
Chu, SC
;
Chern, JL
;
光電工程學系
;
Department of Photonics
The dynamic signature of the subwavelength variation of a slit is shown to be determinable from far-field irradiance with a precision of better than 1 nm. One can increase the efficiency of measurement of the subwavelength's signature by adjusting the detection width over which the subwavelength variation is detected. The subwavelength variation of a rectangular aperture was also examined to show the general feasibility. (C) 2004 Optical Society of America
Effects of grain boundaries on performance and hot-carrier reliability of excimer-laser annealed polycrystalline silicon thin film transistors
(2004-05-15)
Chen, TF
;
Yeh, CF
;
Lou, JC
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This work examines the effects of grain boundaries on the performance and hot-carrier reliability of excimer-laser-annealed polycrystalline silicon thin film transistors (poly-Si TFTs) before and after NH3 plasma treatment. Self-aligned poly-Si TFTs, whose channel regions include a 150 nm thick laser-crystallized poly-Si layer with small grains and a 100 nm thick layer with large grains, are fabricated. Other TFTs, with large grains throughout their channels, are fabricated nearby for comparison. The trapping of electrons at grain boundaries in the drain junction creates strong local electric fields that boost the leakage current, cause the threshold voltage to decline as the drain bias increases, enhance the kink effect in the output characteristics, and degrade the hot-carrier reliability of devices. When static hot-carrier stress is applied to nonhydrogenated poly-Si TFTs for less than 10(4) s at V-GS=10 V and V-DS=20 V, hot holes are injected into the gate oxide at the same time trap states are created in the drain junction. The screening effect is observed when the same stress is applied to devices that have many grain boundaries in their drain junctions. NH3 plasma treatment prevents the trapping of electrons at grain boundaries. The performance of hydrogenated poly-Si TFTs improves, but the hot-carrier reliability of those TFTs with large grains in their drain junctions degrades. The hydrogenation causes a trade-off between the electrical characteristics and the hot-carrier reliability, and introduces irregular humps in the subthreshold region. (C) 2004 American Institute of Physics.
Transmission characteristics of smiling pattern resonators
(2004-05-15)
Hsu, YJ
;
Chern, JL
;
光電工程學系
;
Department of Photonics
We propose and experimentally verify a novel metallic-microstructure composite that consists of smiling-pattern resonators to broaden the bandwidth of resonance, in contrast to the well known narrow-band split ring resonators in the field of meta-materials and left-handed negative-index media. The underlying idea is to introduce multiple interaction scales to the resonator. Our microwave analog experiment shows that the range of resonant frequencies could also be extended apparently with double resonance bands. Furthermore, this smiling-Pattern resonator is superior in manufacturing for its simplicity in structure.
快速分配音訊位元之方法
(2004-05-16)
李俊毅
;
莊孝強
;
方耀諄
;
王俊能
;
蔣迪豪
一種快速分配音訊位元之方法，主要係以整體量化增益(globalgain)以及所使用之位元量(bit)間的線性關係(linearrelationship)建立線性模型，並配合平行化之量化誤差計算而取得音頻編碼所需之位元量，藉以改善傳統包括外部(量化雜訊控制)、內部(碼率控制)雙重回圈耗功費時之運算過程，提升整體的編碼速度，並保持一定水平之音訊品質。
九十二學年度第二學期臨牙所‧碩士班專題討論期初報告
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
報告題目：Torsional properties of rotary nickel-titanium endodontic files after repeated uses 演講時間：93年5月18日 (二) 中午12:30 演講地點：牙醫系館302教室
腦科學中心演講公告
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
演講主題：Beyond the genome: molecular imaging in vivo with microPET 演講時間：93年5月18日 (二) 中午12:00 演講地點：腦科學中心 (陽明護理館 301會議室)
三十而立‧陽明創校三十週年系列報導之二
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
校史及三十週年紀念專刊編輯小組於 3月30日上午9：00，於行政大樓三樓會議室召開工作籌備會第一次會議。
陽明精神．無遠弗屆
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
自從外交替代役這個制度實行以來，陽明從不缺席。不但已經有四位同學剛從學校畢業就加入服務行列，也有在榮總受完骨科專科訓練的醫師，申請到屏東基督教醫院服務，再轉任由該醫院支持的馬拉威醫療團
畢業典禮學位禮服借用事宜
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
＜保管組提供＞有關本校九十二學年度畢業典禮學位服借用、歸還時間地點及尺寸圖示等資訊，請查閱保管組網頁http://www.ym.edu.tw/ind/
石牌醫訊第339期
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
＜教學服務組提供＞日期：2004年5月16日-2004年5月22日
校園步道
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
夏天的腳步近了.. 艷陽高照的午後.. 校園的步道，綠葉成蔭.. 涼風徐徐...帶來枕木的氣息.. 按下快門，抓住春天的尾巴
領取台塑加油降價卡通知
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
＜員生消費合作社提供＞委由本社代為申辦「台塑加油降價卡」之教師、職工、同學，請自即日起於上班時間內（08:00-12:00,13:00-17:00）洽本校行政大樓乙樓總務處文書組林仲燕小姐領取該卡）
在布吉納喝布吉納茶：郭威廷這樣認識非洲
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
布吉納法索Burkinafaso，她的名字其實是蠻有趣的，Burkina是君子的意思，這邊的人們做個約定常會握個手，說C'est Burkina（君子約定喔），Faso是國家，所以BurkinaFaso就是君子之國
徵稿公告
(國立陽明大學, 2004-05-17)
陽明電子報編輯小組
＜教學服務組提供＞兩所學校，公開徵稿，詳情請點入徵稿公告查詢