Browsing by Issue Date, starting with "2004-12-10"

Now showing 1 - 20 of 69025

MOCVD growth of highly strained InGaAs : Sb-GaAs-GaAsP quantum well vertical cavity surface-emitting lasers with 1.27 mu m emission
(2004-12-10)
Kuo, HC
;
Yao, HH
;
Chang, YH
;
Chang, YA
;
Tsai, MY
1.27mum InGaAs:Sb-GaAs-GaAsP vertical cavity surface-emitting lasers (VCSELs) were grown by metalorganic chemical vapor deposition (MOCVD) with superior performance. The threshold current changes between 1.8 and 1.1 mA and the slope efficiency drops below similar to35% when the temperature is raised from room temperature to 70degreesC. With only 5 mA of bias current, the 3 dB modulation frequency response is measured to be 8.36 GHz which is suitable for 10Gb/s operation. The maximal bandwidth is estimated to 10.7GHz with modulation current efficiency factor MCEF) of similar to5.25GHz/(mA)(1/2). The results of InGaAs:Sb-GaAs-GaAsP VCSELs can reach a performance level comparable to GalnAsN VCSELs with better thermal stability and should be considered as a very promising candidate for 1.3 mum commercial applications. (C) 2004 Elsevier B.V. All rights reserved.
K-0 estimation in level granular soil from anisotropic wave velocities on the basis of micromechanics
(2004-12-10)
Pan, YW
;
Liou, JC
;
土木工程學系
;
Department of Civil Engineering
This study aims to explore the possibility for estimating K-0 in a level ground of granular soil by seismic methods on the basis of micromechanics theory. The idea was to simulate in situ cross-hole seismic method for the measurement of wave velocities along various directions of wave-propagation. This work made use of a field simulator to control a K-0 condition (zero lateral strain condition) in specimens. A series of vertical loading containing subsequent loading and unloading were applied to the specimen prepared by pluviation. In general, the K-0 values determined experimentally in this work agreed with the exiting empirical relations. K-0 value was also calibrated from measured anisotropic wave velocities using an optimization procedure. From the comparison of the back-calculated and measured results of K-0, it revealed the feasibility for the determination of the in situ lateral stress in granular soil by seismic methods and on the basis of micromechanics theory as long as enough wave-velocity measurements along various directions of wavepropagation were available. The potential for the usage of the presented methodology for the determination of the in situ lateral stress in level-ground of granular soil by seismic methods seems encouraging. Copyright (C) 2004 John Wiley Sons, Ltd.
Phase frequency detector with a narrow control pulse
(2004-12-14)
Lee
;
Chen-Yi
;
Chen
;
Pao-Lung
A phase frequency detector with a narrow control pulse comprises mainly two substantially equivalent phase latches with a narrow control pulse, and a reset signal generating unit. Each phase latch of a narrow control pulse has a clock pulse input end and a signal output end. Both latches also are connected to the reset signal generating unit. The logic value of each signal output end is decided by which clock pulse input appears first. The reset signal generating unit decides whether or not to generate a reset signal according to the logic values of both signal output ends. The reset signal is then sent to both phase latches of a narrow control pulse, if generated. The present invention can be implemented by a simple circuit. Comparing with the RS NAND PFD or master-slave D PFD, the PFD of the invention has the advantages of faster speed, saving more power and smaller IC chip area. Comparing with dynamic PFD, because the PFD of the invention has a feedback circuit, the storage charges of internal nodes will not be lost due to the leakage current and therefore the working frequency range is wider.
Heuristic dispatching rule to maximize TDD and IDD performance
(2004-12-15)
Ho, TF
;
Li, RK
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
Although mean flow time and tardiness have been used for a long time as indicators in both manufacturing plants and academic research on dispatching rules, according to Theory of Constraints (TOC), neither indicator properly measures deviation from production plans. TOC claims that using throughput dollar-day (TDD) and inventory dollar-day (IDD) can induce the factory to take appropriate actions for the organization as a whole, and that these can be applied to replace various key performance indices used by most factories. However, no one has studied dispatching rules based on TDD and IDD performance indicators. The study addresses two interesting issues. (1) If TDD and IDD are used as performance indicators, do those dispatching rules that yield a better performance in tardiness and mean flow time still yield satisfactory results in terms of TDD and IDD performance? (2) Does a dispatching rule exist to outperform the current dispatching rules in terms of TDD and IDD performance? First, a TDD/IDD-based heuristic dispatching rule is developed to answer these questions. Second, a computational experiment is performed, involving six simulation examples, to compare the proposed TDD/IDD-based heuristic-dispatching rule with the currently used dispatching rules. Five dispatching rules, shortest processing time, earliest due date, total profit, minimum slack and apparent tardiness cost, are adopted herein. The results demonstrate that the developed TDD/IDD-based heuristic dispatching rule is feasible and outperforms the selected dispatching rules in terms of TDD and IDD.
Photoluminescence of ZnSexTe1-x/ZnTe multiple-quantum-well structures grown by molecular-beam epitaxy
(2004-12-15)
Shih, YT
;
Tsai, YL
;
Yuan, CT
;
Chen, CY
;
Yang, CS
This work investigates photoluminescence (PL) spectra from ZnSexTe1-x/ZnTe multiple-quantum-well structures grown on GaAs(001) substrates by molecular-beam epitaxy. The PL data reveal that the band alignment of the ZnSexTe1-x/ZnTe system is type II. The thermal activation energy for quenching the PL intensity was determined from the temperature-dependent PL spectra. The activation energy was found to increase initially and then decrease as the thickness of the ZnSexTe1-x layers decreases from 7 to 3 nm. The temperature-dependent broadening of the PL linewidth was also investigated. The LO-phonon scattering was found to be the dominant broadening mechanism. (C) 2004 American Institute of Physics.
Using biofunctionalized nanoparticles to probe pathogenic bacteria
(2004-12-15)
Ho, KC
;
Tsai, PJ
;
Lin, YS
;
Chen, YC
;
應用化學系
In this paper, we report a method for fabricating biofunctionalized nanoparticles by attaching human immunoglobulin (IgG) onto their surfaces through either electrostatic interactions or covalent binding. We found that these IgG-presenting nanoparticles can bind selectively to the cell walls of pathogens that contain IgG-binding sites based on the investigation of transmission electron microscopy images. Our results demonstrate that such Au-IgG nanoparticles may serve as useful nanoscale probes for exploring the interactions between IgG and pathogens. Furthermore, the IgG-presenting magnetic nanoparticles have been employed as effective affinity probes for selectively concentrating traces of target bacteria from sample solutions. The trapped bacteria were then characterized by using matrix-assisted laser desorption/ionization mass spectrometry. The lowest cell concentration we detected for both Staphylococcus saprophyticus and Staphylococcus aureus in aqueous sample solutions (0.5 mL) was similar to3 x 10(5) cfu/mL, while the detectable cell concentration for S. saprophyticus in a urine sample was similar to3 x 10(7) cfu/mL.
A model-selection-based self-splitting Gaussian mixture learning with application to speaker identification
(2004-12-15)
Cheng, SS
;
Wang, HM
;
Fu, HC
;
資訊工程學系
;
Department of Computer Science
We propose a self-splitting Gaussian mixture learning (SGML) algorithm for Gaussian mixture modelling. The SGML algorithm is deterministic and is able to find an appropriate number of components of the Gaussian mixture model (GMM) based on a self-splitting validity measure, Bayesian information criterion (BIC). It starts with a single component in the feature space and splits adaptively during the learning process until the most appropriate number of components is found. The SGML algorithm also performs well in learning the GMM with a given component number. In our experiments on clustering of a synthetic data set and the text-independent speaker identification task, we have observed the ability of the SGML for model-based clustering and automatically determining the model complexity of the speaker GMMs for speaker identification.
單字比賽成績報告及同學的學習經驗分享
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
1.利用magazine所附單字卡熟悉單字，然後讀兩遍文章再聽廣播。 2. 每天練習且多認識相關同義字。 3. 每一單元結束再複習一次單字及片語或用新學習的單字簡要重述內容。 4. 把新學到的單字做成flash card，沒事就背吧.....
第二屆陽明盃攝影比賽得獎作品公佈
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
為了表達陽明人對陽明的愛，並為致力推廣校內攝影風氣，傳達美學藝文理念及仁心仁術、真知力行的校風，由台灣聯合大學系統主辦，陽明大學通識中心承辦的「第二屆陽明盃攝影比賽」，經過評審後於日前公佈得獎者名單及作品
流式細胞儀(FACSCalibur)原理應用及操作訓練課程
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
儀器中心於12月9日(週四)為新購「流式細胞儀(FACSCalibur)」舉辦原理應用及操作訓練課程，上午的講授因受限於場地僅有54個座位，在報名的第3天後便已告額滿
政大公企教育中心各類學分班
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
＜陽明大學研究發展處代轉訊息＞國科會生物處應國合處邀請，擬公開徵求九十四年度台日雙邊研討會計畫構想，敬請協助推薦，有意申請者，請將申請表格填妥後，於九十四年一月十五日前
九十三學年度第三次(擴大)行政會議
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
時間：九十三年十二月一日(星期三)上午九時整地點：本校會議中心第二會議室
第三十屆運動大會
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
在學生競賽方面，首先登場的是「多腳獸爆走」－15人16腳考驗著全班（系）的默契，有人行徑間仍頻頻看腳步、有人不顧一切的奮力向前衝，也因為衝力太猛，只見終點處，個個人仰馬翻，但同學也樂此不疲
感恩之旅．愛的禮讚：校友郭博昭將榮耀與母校分享
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
博昭老師榮獲中華民國第四十二屆傑出青年醫學研究類獎的消息傳回校園時，秘書室即以第一時間代表學校向博昭老師道賀，博昭老師立刻表示：「我想親自向校長致謝！」
放射醫學科學研究所演講公告
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
題目：Magnetic resonance diffusion spectrum tractography for neuroscience 講者：曾文毅副教授（台大醫學院光電生物醫學研究中心副教授；台大醫院影像醫學部主治醫師）時間：93年12月31日﹝五﹞10：10am~12：00pm 地點：研究大樓103室經辦：放射醫學科學研究所
國立陽明大學醫學院徵求院長候選人啟事
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
申請者應具下列條件：１、資深教授資格。２、卓越學術成就。３、醫學相關專業背景。４、行政主管經驗。５、民國三十四年八月一日以後出生。６、中華民國國籍；同時具有其他國籍者，依修正國籍法第二十條條文規定辦理。
93學年度上學期在學生申請加入分子及發育生物學程辦法
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
申請日期: 93年12月1日起至94年1月10日止（上學期期末結束前一個月）。送件地點: 實驗大樓四樓A300 楊姵羚助教。申請文件: 申請表格(下載)、大學、研究所之成績單，指導老師介紹信，及其它有利申請之資料(例如:讀書計劃，語文能力鑑定等)。
醫學生物技術研究所演講公告
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
題目：Angiogenic factor CCN1: pro-angiogenic activities and integrin binding sites; Role of activating and inhibitory receptors in natural killer cell development and function. 講者：呂世正博士時間：93年12月31日 (五) 下午12:00-13:30 地點：研究大樓202室經辦：醫學生物技術研究所
尖端中心陽明分部演講公告
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
題目：Noninvasive Characterization of Evdving CNS White Matter Injury 主講：宋勝魁﹙Sheng-Kwei Song﹚教授地點：陽明大學實驗大樓二樓解剖學系會議室時間：93年12月24日﹙五﹚下午2點起
國科會公開徵求中日研討會議題
(國立陽明大學, 2004-12-17)
陽明電子報編輯小組
＜陽明大學研究發展處代轉訊息＞國科會生物處應國合處邀請，擬公開徵求九十四年度台日雙邊研討會計畫構想，敬請協助推薦，有意申請者，請將申請表格填妥後，於九十四年一月十五日前