Browsing by Issue Date, starting with "2005-08-04"

Now showing 1 - 20 of 66221

5.4GHz-127 dBc/Hz at 1MHz GaInP/GaAs HBT quadrature VCO using stacked transformers
(2005-08-04)
Meng, CC
;
Chen, CH
;
Chang, YW
;
Huang, GW
;
電信工程研究所
The first fully integrated GaInP/GaAs heterojunction bipolar transistor (HBT) quadrature voltage controlled oscillator (VCO) using the stacked-transformer LC tank is demonstrated at 5.43-5.31 GHz with low-phase-noise performance. The stacked-transformers are formed by two interconnect metal layers and possess good electrical properties at high frequencies because of the semi-insulating GaAs substrate. The quadrature VCO at 5.38 GHz has phase noise of -127.4 dBc/Hz at 1 MHz offset frequency, output power of -4 dBm and a figure of merit (FOM) -191 dBc/Hz.
Improving Lamport one-time signature scheme
(2005-08-05)
Chang, MH
;
Yeh, YS
;
資訊科學與工程研究所
;
Institute of Computer Science and Engineering
One-time signature scheme, a kind of digital signature schemes, is used to sign at most one message; otherwise the signature can be forged. One of the advantages is that the one-time signature generation and verification are very efficient and it is useful for chip cards, where low computation complexity is required. Lamport first invented a one-time digital signature scheme based on one-way functions. However, the Lamport one-time scheme requires a large amount of space for storage of authentic information if a large number of messages are signed. In this paper, we improve the Lamport one-time signature on the amount of storage space for public keys and signed message saving storage space and propose an efficient scheme to sign a long message. Thus, we make the Lamport one-time signature useful in practice. (c) 2004 Elsevier Inc. All rights reserved.
A testing framework for Web application security assessment
(2005-08-05)
Huang, YW
;
Tsai, CH
;
Lin, TP
;
Huang, SK
;
Lee, DT
The rapid development phases and extremely short turnaround time of Web applications make it difficult to eliminate their vulnerabilities. Here we study how software testing techniques such as fault injection and runtime monitoring can be applied to Web applications. We implemented our proposed mechanisms in the Web Application Vulnerability and Error Scanner (WAVES)-a black-box testing framework for automated Web application security assessment. Real-world situations are used to test WAVES and to compare it with other tools. Our results show that WAVES is a feasible platform for assessing Web application security. (c) 2005 Elsevier B.V. All rights reserved.
Improved photoluminescence of 1.26 mu m InGaAs/GaAs quantum wells assisted by Sb surfactant and indium-graded intermediate layers
(2005-08-08)
Chang, YA
;
Kuo, HC
;
Chang, YH
;
Wang, SC
;
光電工程學系
We have grown high-quality InGaAs/GaAs quantum wells (QWs) with emission wavelength range of 1.2-1.26 mu m by metalorganic chemical vapor depositions. By incorporating Sb surfactant and the indium-graded intermediate layers into InGaAs/GaAs QWs, the photoluminescence (PL) intensity of the 1.26-mu m In0.45Ga0.55As/GaAs QW is enhanced by a factor of 20 and the full width at half maximum value is reduced from 60.4 meV to 35.9 meV. The good crystalline quality is proved by temperature-dependent PL, which shows that the activation energies of In0.45Ga0.55As and Sb-assisted indium-graded In0.45Ga0.55As QWs are 20.87 meV and 27.09 meV. (c) 2005 American Institute of Physics.
Photoluminescence of ultra small InAs/GaAs quantum dots
(2005-08-10)
Lin, YG
;
Wu, CH
;
Tyan, SL
;
Lin, SD
;
Lee, CP
The InAs/GaAs quantum dots (QDs) with a baselength of less than 10 nm are studied by the excitation-, temperature-dependent and magneto-photoluminescence (PL). The baselengths of the QDs, calculated by the PL ground state transition energy and estimated by magneto-PL spectra, axe in agreement with the result of atomic force microscopy measurements. By means of the excitation-dependent PL, we demonstrate that only the ground electron and hole states exist when the baselength of the QDs is smaller than about 7.3 nm, whereas the larger dots with a baselength of about 8.7 nm will give rise to one excited hole state. The measured energy separation between the ground and the excited hole states is in good agreement with the theoretical calculation. The transition energy in temperature-dependent PL spectra shows a rapid redshift as the temperature is higher than the critical temperature. The redshift rate is about 2.8 and 2.5 times larger than the values calculated by Varshni's law for small and large dots respectively. The higher redshift rate can be explained by the stronger tunneling effect. In addition, the PL linewidths show a V-shape dependence with the temperature. This behavior could be well described as a tunneling and electron-phonon scattering effect.
快速傅立葉轉換處理器及其動態調整方法及基數-8之快速傅立葉轉換演算法
(2005-08-11)
李鎮宜
;
林昱偉
本發明提供一種快速傅立葉轉換處理器及其動態調整方法及基數-8之快速傅立葉轉換演算法，其係以陣列預取緩衝器架構的快速傅立葉轉換處理器為基礎，以該陣列預取緩衝器每次之運算大小為區塊大小，根據每一區塊內訊號溢位的情形來動態調整訊號，使訊號不會溢位，以降低運算時所產生的量化誤差；而利用三步驟之基數-8快速傅立葉轉換和重新排程的演算法，係可有系統的錯開複數乘法運算的時間並降低蝴蝶運算單元內的運算複雜度。另外，本發明並提出實現式上述方法及演算法之快速傅立葉轉換處理器。
於無線通訊中管控動態通訊品質之多重斜率通訊交遞方法
(2005-08-11)
黃經堯
;
黃作
;
蔡明原
本發明提供一種於無線通訊中管控動態通訊品質之多重斜率通訊交遞方法，其係使行動節點根據不同的通訊聯結狀況調整交遞斜率值，以設定最佳之加入／移除聯結觸發閘值。該方法係行動節點先接收其服務導頻者及鄰近導頻者之導頻強度而產生一聚集強度，接著依據該聚集強度之強弱判斷是否進行交遞，每當進行交遞時則以多重斜率交遞之運算來控制交遞行為，以設定合適之斜率值再求出加入／移除聯結觸發閘值，進而依據當時的通訊聯結品質選擇所欲聯結之導頻者。因此本發明可確實增進通訊服務品質、減少聯結功率消耗及減少通訊頻道使用量。
聽說讀寫學英文．全民英檢大探索
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
有鑑於英文已成為職場以至生活上常用之語文工具，本校平時便多方鼓勵同仁利用各種機會進修，以嫻熟英語之運用；同時將通過「全民英檢」列為未來考核語文能力的指標
Bis(2,2-diphenylvinyl)spirobifluorene: An efficient and stable blue emitter for electroluminescence applications
(2005-08-15)
Wu, FI
;
Shu, CF
;
Wang, TT
;
Diau, EWG
;
Chien, CH
We have synthesized a spirobifluorene-based DPVBi [4,4'-bis(2,2-diphenylvinyl)-1,1'-biphenyl] analogue, DPVSBF [2,7-bis(2,2diphenylvinyl)-9,9'-spirobifluorene], in which the bis(2,2-diphenylvinyl) groups are connected through the 2 and 7 positions of the spirobifluorene framework, and have characterized its thermal properties, electronic properties (viz. absorption and photoluminescence), and electrochemical behavior. The presence of the rigid spirobifluorene linkage imparts significant improvement in the material's glass transition temperature and morphological stability, while preserving most of the photophysical and electronic properties of its non-spiro, biphenyl analogue, DPVBi. Organic electroluminescent devices having the structure ITO/NPB/DPVSBF/AlQ/LiF/Al display bright emissions with a lambda(max) at 474 nm (CIE coordinates: 0.16, 0.24) and exhibit maximum luminescence exceeding 40,000 cd/m(2). At a driving current density of 100 mAcm(2) (6.4 V), a luminance of 4110 cd/m(2) was obtained with external quantum efficiency of 2.54%, luminance efficiency of 4.1 cd/A, and power efficiency of 2.0 lm/W. Moreover, the DPVSBF-based device exhibits a 16-fold enhancement in the operation lifetime relative to that of a similar device based on DPVBi. (C) 2005 Elsevier B.V. All rights reserved.
Optical properties of nanosize aggregation of phenylene vinylene oligomers
(2005-08-15)
Nguyen, TP
;
Yang, SH
;
Gomes, J
;
Wong, MS
;
應用化學系
In this paper, we report the experimental results on the optical properties of oligo-phenylene vinylenes (OPVs) formed in nanosize pores of porous silicon substrates. Strong modifications of the photoluminescence properties of nanosize aggregation of OPVs were observed at room temperature, such as a blue shift of the PL spectra, whereas the structure of the oligomers is preserved as proved by Raman scattering experiments. However, the penetration of the oligomers into the nanopores was found to depend on the conformation of the chains, which is, in turn, conditioned by the solvents, used to dissolve the oligomer powder. (C) 2005 Published by Elsevier B.V.
陽明校史紀錄卅載悠悠歲月
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
去（93）年年初，學校籌議編輯校史，作為創校卅周年紀念。吳校長立即委請甫退休的通識中心王銳主任擔任召集人，校內各院系所及處室主管組成編輯委員，並委派單位代表參與校史之編輯小組工作
智慧財產局「著作權授權資訊快速查詢服務台」
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
＜研發處／代轉訊息＞智慧財產局為協助各界利用人快速獲得著作權授權資訊，試辦「著作權授權資訊快速查詢服務台」。為促進著作財產權人(包括著作權仲介團體)與利用人間和諧、暢通之授權管道，健全市場供需機制，已責成各仲介團體將授權資訊透明化，提供民眾查詢，並鏈結於該局網站.....
94學年度第1次行政主管會報
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
時間：94年8月3日(週三)上午8時30分整地點：行政大樓2樓會議室
立秋 - 唭哩岸山的23.5度效應
(國立陽明大學, 2005-08-15)
李榮文
八月七或八日是二十四節氣的[立秋]—立秋涼風至，秋天的開始。從這一天開始，台灣北部早晚變涼，日夜溫差大。這情形在本校特別明顯，且早到，如今年七月下旬東北向迎風的植株或樹枝的葉片開始變色了，在唭哩岸山(陽明大學校園)可是紅葉知秋，不是落葉知秋喔.....
Injectio-locking laser-diode-based OC-192 optical non-return-to-zero-to-return-to-zero OR logic gate
(2005-08-15)
Chang, YC
;
Lin, GR
;
光電工程學系
;
Department of Photonics
An OC-192 optical return-to-zero- (RZ-) formatted OR logic gate is experimentally demonstrated and theoretically interpreted for the first time to our knowledge. It is implemented by using a data format converter based on an optically injection-locked Fabry-Perot laser diode (FPLD) modulated in below-threshold condition. By injecting two non-return-to-zero data streams into the FPLD-based OR gate, a peak-power-equalized RZ-formatted OR logic data stream extinction ratio of > 8 dB is obtained from the FPLD with optimized rf-modulating and optical injecting powers of 24.7 and >-4 dBm, respectively. The highest data rate of up to 12.5 Gbits/s with a bit error rate (BER) of 10(-13) at a received optical power of >-16 dBm can be achieved by increasing the de bias current of the FPLD-based RZ-formatted OR logic gate to 8 mA. The OR-gated RZ data stream exhibits a duty cycle (pulse width) of similar to 27% (27 ps) and a 0.5 dB power penalty at a BER of 10(-9) at a data rate of 9.953 Gbits/s. (c) 2005 Optical Society of America.
本校招待所暫停開放
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
＜保管組／提供＞本校招待所進行整修，即日起暫停開放(校友會館維持開放)，不便之處，敬祈　諒察.....
創新育成中心注入新血．擴大推廣
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
本校創新育成中心，一直以來努力提供完整的生技醫療環境給進駐廠商，培育以生物技術及醫療科技的研發、產出為主的中小企業，從上游的研發，到中、下游的動物試驗、臨床試驗
High-power efficient tunable Nd : GdVO4 laser at 1083 nm
(2005-08-15)
Chen, YF
;
Ku, ML
;
Su, KW
;
電子物理學系
;
Department of Electrophysics
An efficient tunable diode-pumped Nd:GdVO4 laser at 1083 nm has been constructed by suppressing the higher gain transition near 1063 nm. With 12.5 W diode pump power, the free-running output power centered about 1083 nm was up to 3.4 W, corresponding to an optical-to-optical conversion efficiency of 30.1%. When a simple uncoated etalon was used as a wavelength-selective element, the output power at each helium transition was higher than 2.5 W. (c) 2005 Optical Society of America.
創新育成中心徵才
(國立陽明大學, 2005-08-15)
陽明電子報編輯小組
＜創新育成中心／提供＞徵才職位：專員，大學以上，科系不限，具兩年以上學術或研究計畫管理及會計相關工作經驗，性別不拘
法蘭西遊記（1）
(國立陽明大學, 2005-08-15)
錢玨琄
沿著優美的提烏運河(Canal du Thiou)，穿梭漫步在寂靜的舊城區巷弄中，細細瀏覽櫛比鱗次的古老建築；找間當地人群聚的咖啡店，坐在拱廊下享受法式早餐，讓心情也隨著精神振奮起來