Browsing by Issue Date, starting with "2009-12-15"

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Spectrally Efficient Direct-Detected OFDM Transmission Incorporating a Tunable Frequency Gap and an Iterative Detection Techniques
(2009-12-15)
Peng, Wei-Ren
;
Zhang, Bo
;
Feng, Kai-Ming
;
Wu, Xiaoxia
;
Willner, Alan E.
We analytically and experimentally demonstrate a linearly field-modulated, direct-detected virtual single-side-band orthogonal frequency-division multiplexing (VSSB-OFDM) system that employs a tunable frequency gap and an iterative detection technique. The VSSB-OFDM that uses no frequency gap, which is referred to as the gapless VSSB-OFDM, is proposed as a spectrally efficient format. Compared with the intensity-modulated SSB-OFDM, the gapless VSSB-OFDM saves half the electrical bandwidth (BW), and exhibits better receiving sensitivity and more robust tolerance against fiber chromatic dispersion (CD). Furthermore, by incorporating a tunable frequency gap between the optical carrier and the OFDM data sideband, the calculating burden of the iterative detection is greatly alleviated and the system performance can be flexibly improved within moderate iterations. The width of the optimum frequency gap is found to be similar to 0.35 sideband BW, which is reached by trading the levels of signal-signal beat interference and the residual image beat interference. Such a gapped VSSB-OFDM system requires fewer iterations to extract the desired data from the interfered signal and exhibits greater robustness against the carrier-to-signal-power ratio (CSPR) variation, compared with the gapless VSSB-OFDM. In this paper, the analytical model of the proposed gapped VSSB-OFDM system will be addressed. In addition, we also successfully conduct a gapped VSSB-OFDM signal transmission over 1600 km of uncompensated standard single-mode fiber (SSMF) with only similar to 3 dB optical SNR (OSNR) penalty, and obtain a significant OSNR sensitivity improvement of 8 dB, compared with the gapless VSSB-OFDM, after such a 1600-km fiber link.
Label-free biosensing of a gene mutation using a silicon nanowire field-effect transistor
(2009-12-15)
Wu, Chi-Chang
;
Ko, Fu-Hsiang
;
Yang, Yuh-Shyong
;
Hsia, Der-Ling
;
Lee, Bo-Syuan
We have developed a silicon nanowire field-effect transistor (NWFET) that allows deoxyribonucleic acid (DNA) biosensing. The nanowire (NW) was fabricated on a silicon-on-insulator wafer to provide effective ohmic contact. The NWFET sensor displayed n-channel depletion characteristics. To demonstrate the sensing capacity of the NWFET, we employed the BRAF(V599E) mutation gene, which correlates to the occurrence of cancers, as the target DNA sequence. The threshold voltage of the NWFET increased when the mutation gene was hybridized with the capture DNA strands on the nanowire, and decreased to the original level after de-hybridization of the gene. The shift in the drain current-gate voltage (ID-VG) curves revealed that the electrical signal had a logarithmic relationship with respect to the concentration of the mutation gene of up to six orders of magnitude, with the detection limit in the sub-femtomolar level. The detection results of mismatched DNA sequences, including one- and five-base-mismatched DNA strands, could be distinguished from complementary DNA gene by this sensor. The excellent electrical results obtained using this label-free NWFET sensor suggest that such devices might be potentially useful tools for biological research and oncogene screening. (C) 2009 Elsevier B.V. All rights reserved.
Compact photonic delay line constructed by holographic optical elements
(2009-12-15)
Deng, Jiun-Shiou
;
Lu, Ming-Feng
;
Huang, Yang-Tung
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
To fully support phased-array antenna and other applications, a 3-range (long time, moderate time, and short time) delay line structures with holographic optical elements is proposed. Flexibility, light-weight, on-axis coupling, easy alignment, easy fabrication, and compactness are their advantages. When use holographic optical elements to build the photonic delay line system, all of the delay and non-delay paths in these three photonic delay lines are setting in a compact structure. They do not need any extra components, such as mirrors and optical paths in free space, and can bear stronger vibration. Therefore, the holographic optical elements are more suitable to design the photonic delay lines. In these three structures, their losses and crosstalk s are balanced. All of delay and non-delay cases in these three delay line their crosstalk, signal-to-noise ratio, and loss are 1/81,000, 59.1 dB, and 3.2 dB, respectively. Finally, to support complete applications, a polarization independent photonic delay line system with holographic optical elements is proposed, too. (C) 2009 Elsevier B.V. All rights reserved.
Picosecond optical vortex converted from multigigahertz self-mode-locked high-order Hermite-Gaussian Nd:GdVO4 lasers
(2009-12-15)
Liang, H. C.
;
Huang, Y. J.
;
Lin, Y. C.
;
Lu, T. H.
;
Chen, Y. F.
We report on a gigahertz self-mode-locked high-order Hermite-Gaussian (HG) Nd:GdVO4 laser. With a pump power of 2.2 W, the average output power for the TEM0,m modes from m=9 to m=0 are among 350-780 mW at a repetition rate of 3.5 GHz. The mode-locked pulse width is in the range of 20-25 ps for various HG TEM0,m modes. With a simple cylindrical-lens converter, the mode-locked HG beams are converted to generate picosecond optical vortex pulses. (C) 2009 Optical Society of America
Advanced modulation formats for delivery of heterogeneous wired and wireless access networks
(2009-12-15)
Chow, C. W.
;
Yeh, C. H.
;
光電工程學系
;
Department of Photonics
It is believed that the integration of wired and wireless access networks (or heterogeneous network) will provide high bandwidth and flexibility for both fixed and mobile users in a single and cost-effective platform. Here, we propose and demonstrate a signal remodulated wired and wireless network with wireless signal broadcast. Dark-retum-to-zero (DRZ) and polarization-shift-keying (PolSK) signals are used for the downstream wired and wireless applications respectively. At the remote antenna unit (RAU). the PolSK signal is demodulated to produce the binary-phase-shift-keying (BPSK) signal, which will be used for the wireless broadcast application. Signal remodulation is demonstrated using reflective semiconductor optical amplifier (RSOA) as a colorless reflective modulator in the optical networking unit (ONU)/RAU. The downstream signal is remodulated at the ONU/RAU to produce the non-retum-to-zero (NRZ) upstream signal. (C) 2009 Elsevier B.V. All rights reserved.
Temperature dependence of Fluorine-doped tin oxide films produced by ultrasonic spray pyrolysis
(2009-12-15)
Lin, Chin-Ching
;
Chiang, Mei-Ching
;
Chen, Yu-Wei
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Fluorine-doped tin oxide (FTO) films were prepared at different substrate temperatures by ultrasonic spray pyrolysis technique on glass substrates. Among F-doped tin oxide films, the lowest resistivitiy was found to be 6.2 x 10(-4) Omega-cm for a doping percentage of 50 mol% of fluorine in 0.5 M solution, deposited at 400 degrees C. Hall coefficient analyses and secondary ion mass spectrometry (SIMS) measured the electron carrier concentration that varies from 3.52 x 10(20) cm(-3) to 6.21 x 10(20) cm(-3) with increasing fluorine content from 4.6 x 10(20) cm(-3) to 7.2 x 10(20) cm(-3) in FTO films deposited on various temperatures. Deposition temperature on FTO films has been optimized for achieving a minimum resistivity and maximum optical transmittance. (C) 2009 Elsevier B.V. All rights reserved.
Picosecond optical vortex converted from multigigahertz self-mode-locked high-order Hermite-Gaussian Nd:GdVO(4) lasers
(2009-12-15)
Liang, H. C.
;
Huang, Y. J.
;
Lin, Y. C.
;
Lu, T. H.
;
Chen, Y. F.
We report on a gigahertz self-mode-locked high-order Hermite-Gaussian (HG) Nd:GdVO(4) laser. With a pump power of 2.2 W, the average output power for the TEM(0,m) modes from m=9 to m=0 are among 350-780 mW at a repetition rate of 3.5 GHz. The mode-locked pulse width is in the range of 20-25 ps for various HG TEM(0,m) modes. With a simple cylindrical-lens converter, the mode-locked HG beams are converted to generate picosecond optical vortex pulses. (C) 2009 Optical Society of America
放大器非線性失真之幕後校正方法及系統
(2009-12-16)
范振麟
;
吳介琮
本發明是關於一種放大器非線性失真之幕後校正方法及系統。主要是藉由將大小不同之亂數訊號在進入放大器前分別以個別或一起混入的方式混入輸入訊號之中，讓這些亂數訊號與輸入訊號一起經由放大器放大，並且由後級的類比數位轉換器加以量化成數位輸出訊號。再來將該數位輸出訊號經由非線性補償電路線性化以產出一個線性化輸出訊號，接著將該線性化輸出訊號與後級的類比數位轉換器的數位輸出訊號經參數萃取器將校正參數萃取出來。最後利用非線性係數偵測器把校正參數之非線性係數計算出來，將該非線性係數輸出給非線性補償電路以進行非線性補償並達到放大器非線性失真之幕後校正。其中非線性係數偵測器是由累加器、加法器與減法器所組成，此偵測器利用注入的亂數序列之值將非線性失真係數加以計算出來。
海外服務方案資源募集與整合
(2009-12-16)
陳雪珠
;
林念慈
;
開放教育推動中心
;
Open Education Office
課程日期： 2009年12月16日(三) 演講人：陳雪珠小姐、林念慈小姐內容摘要：你曾經玩過魔術方塊嗎？在玩這個遊戲時，你是否只專注在堆疊出幾個同花色的方塊呢？在本周課程中，講師告訴同學們，在方案的資源募集與整合上，應該將目光放遠，而不能只是緊抓著現有的資源不放。內容：影音實況影音(*.flv檔) 實況影音(*.wmv檔)
空間光調制器
(2009-12-16)
孫慶成
;
余業緯
;
謝舒菁
應用於同軸體積全像存取系統之空間光調制器，利用中空的相位調制器將周圍部分的入射光調制為參考光，而於中央部份的入射光受強度調制器調制為信號光。此空間光調制器可提升儲存系統之點擴散函式的收斂。
入侵者偵測系統及方法
(2009-12-16)
宋開泰
;
林嘉豪
;
林志昇
;
楊舒涵
本發明為一結合無線感測網路與保全機器人之入侵者偵測系統。於環境中佈建之無線感測模組，可以多重感測型式偵測各節點附近是否有入侵者或異常狀況，並透過網狀無線網路傳送給保全監控中心及保全機器人。機器人具有在環境中自主運動的能力，在偵測到異狀或警報觸發時前往問題發生點察看，並透過無線網路即時將影像資訊傳送到保全人員及主人之行動裝置上，可以及時得知現場狀況，達到保全之功效。
The Self-Assembled Structure of the Diblock Copolymer PCL-b-P4VP Transforms Upon Competitive Interactions with Octaphenol Polyhedral Oligomeric Silsesquioxane
(2009-12-16)
Lu, Chu-Hua
;
Kuo, Shiao-Wei
;
Chang, Wen-Teng
;
Chang, Feng-Chih
;
應用化學系
This paper describes the miscibility and self-assembly, mediated by hydrogen-bonding interactions, of new block copolymer/nanoparticle blends. The morphologies adopted by the immiscible poly[(epsilon-caprolactone)-block-(4-vinyl pyridine)] (PCL-b-P4VP) diblock copolymer changes upon increasing the number of competitive hydrogen-bonding interactions after adding increasing amounts of octaphenol polyhedral oligomeric silsesquioxane (OP-POSS). Transmission electron microscopy reveals morphologies that exhibit high degrees of long-range order, such as cylindrical and spherical structures, at relatively low OP-POSS contents, and short-range order or disordered structures at higher OP-POSS contents. Analyses performed using differential scanning calorimetry, wide-angle X-ray diffraction, and FT-IR spectroscopy provide positive evidence that the pyridyl units of the P4VP block are significantly stronger hydrogen-bond acceptors toward the OH group of OP-POSS than are the C=O groups of the PCL block, thereby resulting in excluded and confined PCL phases.
測試資料之鏈路架構
(2009-12-16)
林佳毅
;
陳宏明
本發明係有關於一種鏈路架構，尤指一種測試資料之鏈路架構，其包括有一第一資料鏈及一第二資料鏈；第一資料鏈上串列有複數個第一資料處理模組，可處理一第一壓縮資料而產生對應之第一解碼資料，第二資料鏈上串列有複數個分別對應各個第一資料處理模組之第二資料儲存模組，而第二資料鏈係可將一第二資料傳送給各個第二資料儲存模組，且各第一資料處理模組係可將第一解碼資料將傳送至第二資料儲存模組，並與第二資料組配成一測試樣本資料，晶片內部設置此電路則在進行測試時不僅可減少傳輸測試樣本資料量，更可有效縮短資料傳輸之時間。
コリニア体積ホログラフィックストレージシステムに応用する空間光変調器
(2009-12-17)
孫慶成
;
余業緯
;
謝舒▲菁▼
【課題】コリニア体積ホログラフィックストレージシステムに応用する空間光変調器を提供する。【解決手段】コリニア体積ホログラフィックストレージシステムに応用する空間光変調器は、中空の位相変調器を利用し、入射光の周辺部分を参照光に変調し、強度変調器により、入射光の中央部分を信号光に変調する。この空間光変調器は、システムの点広がり関数の収束を向上させることができる。【選択図】図４ａ
侵入者検知システム及びその方法
(2009-12-17)
宋開泰
;
林嘉豪
;
林志昇
;
楊舒涵
【課題】無線センサーネットワークと警備ロボットとが結合される侵入者検知システムである。【解決手段】環境において配置されるＺｉｇｂｅｅ無線センサーモジュールは、多重のセンサーにより各ノードの付近に侵入者や異常があるかどうかを検知し、網目状無線ネットワークを介して警備監視センターと警備ロボットに送信することができる。上記ロボットは、環境において自主的に移動することができ、また、異常が検知された場合、又は警報がトリガされた場合、問題の発生点へ調べに行き、無線ネットワークを介して画像情報を即時に警備員やユーザの携帯装置に送信する。これによって、現場の状況を遅延なく把握し、警備の効果を達成することができる。【選択図】図２
BACKGROUND CALIBRATION SYSTEM FOR CALIBRATING NON-LINEAR DISTORTION OF AMPLIFIER AND METHOD THEREOF
(2009-12-17)
FAN, Jen-Lin
;
WU, Jieh-Tsorng
The present invention discloses a background calibration system and method for calibrating the non-linear distortion of the amplifier. The calibration method in the present invention includes: generating random sequences and inputting the random sequences in different amount and different sets into an amplifier; amplifying the random sequences and detecting linear and non-linear coefficients; quantizing the output linear signal from the amplifier, and generating a digital output signal; multiplying the digital output signal to generate a high-order signal; generating an estimated non-linear error for the amplifier by multiplying the high-order signal with the estimated non-linear coefficient; adding the non-linear signal with the digital output signal to generate a linear output signal; calculating the random value from the parameter extractor to determine the occurrence of non-linear distortion in the circuit, and further adjusting the non-linear coefficient to calibrating the amplifier.
Flexible Fullerene Field-Effect Transistors Fabricated Through Solution Processing
(2009-12-18)
Sung, Chao-Feng
;
Kekuda, Dhananjay
;
Chu, Li Fen
;
Lee, Yuh-Zheng
;
Chen, Fang-Chung
C60-based thin-film transistors are fabricated through solution processing. On rigid indium tin oxide (ITO) glass, the transistors display electron mobilities as high as 0.21 cm(2) V(-1) s(-1) and a threshold voltage of 0.7V, only slightly lower than those of organic thin-film transistors prepared through vacuum deposition. On ITO-coated PET substrates, the mobilities in the flexible devices (see image) are approximately one order of magnitude lower than those of devices prepared on rigid glass substrates.
解謎風潮推理小說在台灣
(2009-12-20)
陳宣聿
;
Department of Communication and Technology
;
傳播與科技學系
伴隨著都市化的不安及社會失序的恐懼，以法律而非武力為制裁工具的偵探角色，成為了人們心目中的英雄。雖然謎的呈現形式不同，但推理小說仍具有濃厚的儀式性，讀者跟隨著偵探的腳步，從充滿不確定的、失序的狀態，在一定的模式下走回可被認識的日常。
失落的大安濱海樂園
(2009-12-20)
鄭琬馨
;
Department of Communication and Technology
;
傳播與科技學系
大安濱海樂園曾是中部地區有名的景點，卻因水質未通過檢驗而被勒令停業。昔日的樂園，現在卻任由荒廢。政府在努力發展觀光的同時，是否能利用現有資源加以強化，而非一味浪費？
第六十七期總編輯的話
(2009-12-20)
黃艾如
;
Department of Communication and Technology
;
傳播與科技學系
雖然不是第一次擔任編輯台的工作，卻是第一次當總編，因此不免有些戰戰兢兢，深怕錯字沒改到、頭條沒選好、小標下得不知所云等等，幸好記者們都表現得很好，加上其他編輯們的努力，到我手上的稿子其實沒有什麼需要動刀的，在這邊先謝謝大家。