Browsing by Issue Date, starting with "2015-07-10"

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A 65-77 GHz low power, meander-type transmission line CMOS low-noise amplifier
(2015-07-10)
Huang, Zhe-Yang
;
Chen, Chun-Chieh
;
Hung, Chung-Chih
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電機資訊學士班
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
A 65-77 GHz low power, meander-type transmission line CMOS low-noise amplifier for E-band millimetre-wave communication using 90 nm MS/RF CMOS process is demonstrated. The low-noise amplifier consists of multi-stage cascaded common-source amplifiers with optimized noise figure, power gain, and power consumption. The LNA achieves 11.7 dB power gain, 5.5 dB noise figure, and 17.7 mW power consumption. The meander-type transmission line circuit design is adopted to reduce chip area; the total transmission line area in LNA is only 0.024 mm(2).
利用多攝影機自動偵測與追蹤多目標的方法及系統
(2015-07-11)
黃敬群
;
王聖智
一種利用多攝影機偵測與追蹤多目標之方法，包含：(a)以一目標偵測演算法分析多個攝影機場景之偵測結果，用以產生複數個分析資料；(b)利用貝士(Bayesian)架構整合該等分析資料以建立一目標偵測機率(TDP)分佈；以及(c)同時自動偵測與追蹤在該等攝影機場景之監控區域中之複數個移動目標；其中，該監視區係由所有攝影機的重疊視野所決定。
應用複數攝影裝置之物件定位方法
(2015-07-11)
羅國華
;
莊仁輝
;
林泓宏
一種應用複數攝影裝置之物件定位方法，包含：於複數攝影畫面中任一者產生至少一二維取樣線(line sample)，其中各該等攝影畫面具有一消失點以及至少一前景(foreground)區域，該二維取樣線由該消失點所射出，並通過該前景區域；建構複數三維取樣線，其中各該等三維取樣線是根據該等攝影畫面之任二者中任一組成對之該二維取樣線，於複數三維參考平面其中之一上建構，各該等三維取樣線直立於複數參考平面；以及將由該等攝影裝置所建構出的該等三維取樣線，透過計算進行一物件群組區分程序以取得一物件群組數目，以根據該物件群組數目決定一前景視訊物件之一三維位置。
資料偵測系統
(2015-07-11)
林盈達
;
李佳穎
;
張育妮
;
徐鵬凱
;
賴源正
一種資料偵測系統，係包括：複數個偵測單元，係分別以二元偵測機制、三元偵測機制或連續值偵測機制進行資料偵測，其中，該複數個偵測單元係形成循序架構，以使該複數個偵測單元之一者的偵測結果輸入至該複數個偵測單元之另一者來進行相同的資料偵測，且其中，該循序架構係再次對同一資料進行相同或不同精細程度之偵測。
蛋白質電晶體裝置
(2015-07-11)
黃國華
;
洪孟燕
;
陳昱勳
一種蛋白質電晶體裝置，包括：一電晶體，具有一汲極電極、一源極電極及一閘極電極，且該汲極電極與該源極電極之間具有一奈米通道；至少二奈米金粒子，分別設於該汲極電極及該源極電極上，將一第一抗體分子通過該奈米通道自組裝結合至該二奈米金粒子上，據以形成一分子接點；及一量子點，其接合一第二抗體分子並鍵結於該分子接點上。
液晶感測器及用於檢測生物分子的方法
(2015-07-11)
李偉
;
李孟娟
;
孫士弘
;
蘇慧汶
一種液晶感測器，包含：一第一單元，包括一第一基板，及一形成於該第一基板一表面的第一配向膜；一第二單元，與該第一單元間隔且相對應設置並包括一第二基板，及一與該第一配向膜間隔且相對應設置並形成於該第二基板一表面的第二配向膜，其中，該第二配向膜的一表面具有親水性；一液晶層，形成於該第一配向膜與該第二配向膜之間且包括一向列型液晶組份，其中，該向列型液晶組份於20~25℃及波長589nm下所測得的雙折射率△n 範圍為大於0.2至小於0.4；以及一待測物；其中，該第二配向膜能與該待測物結合而使該待測物固定於該第二配向膜具有親水性的表面，以及當該待測物中含有生物分子時，與該生物分子接觸的向列型液晶組份的位向會異於與該生物分子未接觸的向列型液晶組份的位向。
使用擬隨機碼控制功率電晶體導通及關閉時序隨機延遲的裝置
(2015-07-11)
曾煜輝
;
蘇朝琴
;
何盈杰
;
林庭佑
;
吳嘉哲
一種使用擬隨機碼控制功率電晶體導通及關閉時序隨機延遲的裝置，其功率電晶體係由複數個功率電晶體子元件組成，包含：一擬隨機碼產生器；一時序控制信號產生器，係產生一導通或關閉控制信號；一時脈信號產生器，係電氣性連接該擬隨機碼產生器之時脈輸入；一時序延遲控制器，係電氣性連接該擬隨機碼產生器、該時序控制信號產生器及該複數個功率電晶體子元件；其中，該擬隨機碼產生器係控制該時序延遲控制器，使經過該時序延遲控制器之該時序控制信號產生器之導通或關閉控制信號產生隨機延遲之效果後，再輸出至複數個功率電晶體子元件。
電阻式隨存記憶體之製作方法
(2015-07-11)
曾俊元
;
王聖裕
;
蔡承翰
一種電阻式隨存記憶體之製作方法，包含：(a)於一基材上形成一第一電極；(b)於該第一電極上以一175℃至225℃的製程溫度形成一氧化鋯之可變電阻層；及(c)於該可變電阻層上形成一Ti的第二電極；其中，該步驟(b)之可變電阻層的形成是經由濺鍍技術來完成；其中，相較於在一250℃之製程溫度下所製得之氧化鋯之可變電阻層，該步驟(b)在該175℃至225℃之製程溫度下所製作的氧化鋯之可變電阻層於寫入態與抹除態之間的靜態電阻轉換循環次數，能在+1.5V至-2.5V之直流電壓與10次/V之收集頻率的測試條件下，至少提升至6800次。
具頻帶截止功能之超寬頻天線
(2015-07-11)
鍾世忠
;
莊肇堂
一種具頻帶截止功能之超寬頻天線，包括：一上層非均勻式短路金屬貼片，其係與一訊號傳輸段連接；一中間層金屬輻射貼片，其係電性連接至該上層非均勻式短路金屬貼片；以及一下層金屬貼片，其包含有一接地金屬墊、及一耦合開路/短路殘段，該耦合開路/短路殘段係包含有一開路殘段、及一短路殘段，該短路殘段係電性連接至該中間層金屬輻射貼片；其中，該上層非均勻式短路金屬貼片之等效電路係為一並聯LC共振器，該耦合開路/短路殘段之等效電路係為一串聯LC共振器，該上層非均勻式短路金屬貼片之共振頻率係等同於該耦合開路/短路殘段之共振頻率，以使該上層非均勻式短路金屬貼片與該耦合開路/短路殘段組成二階帶拒濾波器。
具有增益校正之鎖相迴路、用於鎖相迴路之增益量測方法、校正方法及抖動量測方法
(2015-07-11)
陳巍仁
;
莊書瑾
一種用於鎖相迴路之振盪器增益量測方法，該鎖相迴路包括由迴路濾波器、振盪器和計數器所組成之迴授相位積分路徑、由和差調變器和累加器所組成之參考相位積分路徑、以及比較該迴授相位積分路徑和該參考相位積分路徑的輸出之相位量化器，該用於鎖相迴路之振盪器增益量測方法係包括以下步驟：(1)於該振盪器的輸入端提供一變化碼；(2)依據該變化碼使該參考相位積分路徑輸出多餘參考相位資訊，並使該迴授相位積分路徑輸出多餘迴授相位資訊；以及(3)根據該多餘參考相位資訊和該多餘迴授相位資訊，獲得該振盪器之估計增益資訊。
Going beyond 4 Gbps data rate by employing RGB laser diodes for visible light communication
(2015-07-13)
Janjua, Bilal
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Oubei, Hassan M.
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Retamal, Jose R. Duran
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Ng, Tien Khee
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Tsai, Cheng-Ting
With increasing interest in visible light communication, the laser diode (LD) provides an attractive alternative, with higher efficiency, shorter linewidth and larger bandwidth for high-speed visible light communication (VLC). Previously, more than 3 Gbps data rate was demonstrated using LED. By using LDs and spectral-efficient orthogonal frequency division multiplexing encoding scheme, significantly higher data rates has been achieved in this work. Using 16-QAM modulation scheme, in conjunction with red, blue and green LDs, data rates of 4.4 Gbps, 4 Gbps and 4 Gbps, with the corresponding BER/SNR/EVM of 3.3 x 10(-3)/15.3/17.9, 1.4 x 10-3/16.3/15.4 and 2.8 x 10(-3)/15.5/16.7 were obtained over transmission distance of similar to 20 cm. We also simultaneously demonstrated white light emission using red, blue and green LDs, after passing through a commercially available diffuser element. Our work highlighted that a tradeoff exists in operating the blue LDs at optimum bias condition while maintaining good color temperature. The best results were obtained when encoding red LDs which gave both the strongest received signal amplitude and white light with CCT value of 5835K. (C) 2015 Optical Society of America
Dynamic integral imaging display with electrically moving array lenslet technique using liquid crystal lens
(2015-07-13)
Jen, Tai-Hsiang
;
Shen, Xin
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Yao, Gang
;
Huang, Yi-Pai
;
Shieh, Han-Ping D.
Integral imaging (InIm) has been widely investigated for threedimensional (3-D) display applications. Aliasing due to the lenslet arrays is one of the limitations of InIm displays. In this paper, we propose a dynamic InIm display using electrically movable liquid crystal (LC) lens array to implement the moving array lenslet technique (MALT) and to eliminate the multifacet phenomenon in the 3-D images. The improvement of the viewing quality of dynamic InIm display is experimentally verified. (C) 2015 Optical Society of America
High-power noise-like pulse generation using a 1.56-mu m all-fiber laser system
(2015-07-13)
Lin, Shih-Shian
;
Hwang, Sheng-Kwang
;
Liu, Jia-Ming
;
光電系統研究所
;
Institute of Photonic System
We demonstrated an all-fiber, high-power noise-like pulse laser system at the 1.56-mu m wavelength. A low-power noise-like pulse train generated by a ring oscillator was amplified using a two-stage amplifier, where the performance of the second-stage amplifier determined the final output power level. The optical intensity in the second-stage amplifier was managed well to avoid not only the excessive spectral broadening induced by nonlinearities but also any damage to the device. On the other hand, the power conversion efficiency of the amplifier was optimized through proper control of its pump wavelength. The pump wavelength determines the pump absorption and therefore the power conversion efficiency of the gain fiber. Through this approach, the average power of the noise-like pulse train was amplified considerably to an output of 13.1 W, resulting in a power conversion efficiency of 36.1% and a pulse energy of 0.85 mu J. To the best of our knowledge, these amplified pulses have the highest average power and pulse energy for noise-like pulses in the 1.56-mu m wavelength region. As a result, the net gain in the cascaded amplifier reached 30 dB. With peak and pedestal widths of 168 fs and 61.3 ps, respectively, for the amplified pulses, the pedestal-to-peak intensity ratio of the autocorrelation trace remains at the value of 0.5 required for truly noise-like pulses. (C) 2015 Optical Society of America
Shape and Confinement Effects of Various Terminal Siloxane Groups on Supramolecular Interactions of Hydrogen-Bonded Bent-Core Liquid Crystals
(2015-07-14)
Chiang, I-Hung
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Chuang, Wei-Tsung
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Lu, Chia-Lin
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Lee, Ming-Tao
;
Lin, Hong-Cheu
To investigate the shape and confinement effects of the terminal siloxane groups on the self-assembled behavior of molecular arrangements in hydrogen-bonded (H-bonded) bent-core complexes, four H-bonded bent-core complexes Si, P1, C4, and P8 with string-, ring-, and cagelike siloxane termini (i.e., linear siloxane unit -Si-O-Si-O-Si, cyclic siloxane unit (Si-O)(4), and silsesquioxane unit PUSS, respectively) were synthesized and investigated. By X-ray diffraction measurements, different types of SmCG (B8) phases and leaning angles were controlled by the shape effect of the string- and cage-like siloxane termini for Si and P1 (with only one arm of H-bonded bent-core), respectively. In addition, the confinement effect of Pi, C4, and P8 (accompanied by increasing the numbers of attached H-bonded bent-core arms) resulted in higher transition temperatures and the diminishing of mesophasic ranges (even the disappearance of mesophase in P8). Moreover, AFM images showed the bilayer smectic CG phases of Si and P1 were aligned to reveal highly ordered thread-like structures by a DC field. By spontaneous polarization measurements within the mesophasic ranges, Si and P1 showed ferroelectric transitions but C4 displayed antiferroelectricity. Finally, the electro-optical performance of B8 phases could be optimized through binary mixtures of Si and P1, and a well aligned modulated ribbon phase could be formed via specific molar ratios of the binary mixtures.
Tuning the functionalities of a mesocrystal via structural coupling
(2015-07-14)
Liu, Heng-Jui
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Liu, Yun-Ya
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Tsai, Chih-Ya
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Liao, Sheng-Chieh
;
Chen, Ying-Jiun
In the past decades, mesocrystal, a kind of nanocrystals with specific crystallographic orientation, has drawn a lot of attention due to its intriguing functionalities. While the research community keeps searching for new mesocrystal systems, it is equally crucial to develop new approaches to tune the properties of mesocrystals. In this work, a self-organized two-dimensional mesocrystal composed of highly oriented CoFe2O4 (CFO) nano-crystals with assistance of different perovskite matrices is studied as a model system. We have demonstrated that the strain state and corresponding magnetic properties of the CFO mesocrystal can be modulated by changing the surrounding perovskite matrix through their intimate structural coupling. Interestingly, this controllability is more strongly correlated to the competition of bonding strength between the matrices and the CFO mesocrystals rather than the lattice mismatch. When embedded in a matrix with a higher melting point or stiffness, the CFO mesocrystal experiences higher out-of-plane compressive strain and shows a stronger magnetic anisotropy as well as cation site-exchange. Our study suggests a new pathway to tailor the functionalities of mesocrystals.
Perspective: Spectroscopy and kinetics of small gaseous Criegee intermediates
(2015-07-14)
Lee, Yuan-Pern
;
應用化學系
;
應用化學系分子科學碩博班
;
Department of Applied Chemistry
;
Institute of Molecular science
The Criegee intermediates, carbonyl oxides proposed by Criegee in 1949 as key intermediates in the ozonolysis of alkenes, play important roles in many aspects of atmospheric chemistry. Because direct detection of these gaseous intermediates was unavailable until recently, previous understanding of their reactions, derived from indirect experimental evidence, had great uncertainties. Recent laboratory detection of the simplest Criegee intermediate CH2OO and some larger members, produced from ultraviolet irradiation of corresponding diiodoalkanes in O-2, with various methods such as photoionization, ultraviolet absorption, infrared absorption, and microwave spectroscopy opens a new door to improved understanding of the roles of these Criegee intermediates. Their structures and spectral parameters have been characterized; their significant zwitterionic nature is hence confirmed. CH2OO, along with other products, has also been detected directly with microwave spectroscopy in gaseous ozonolysis reactions of ethene. The detailed kinetics of the source reaction, CH2I + O-2, which is critical to laboratory studies of CH2OO, are now understood satisfactorily. The kinetic investigations using direct detection identified some important atmospheric reactions, including reactions with NO2, SO2, water dimer, carboxylic acids, and carbonyl compounds. Efforts toward the characterization of larger Criegee intermediates and the investigation of related reactions are in progress. Some reactions of CH3CHOO are found to depend on conformation. This perspective examines progress toward the direct spectral characterization of Criegee intermediates and investigations of the associated reaction kinetics, and indicates some unresolved problems and prospective challenges for this exciting field of research. (C) 2015 AIP Publishing LLC.
Incorporation of Fluorine onto Different Positions of Phenyl Substituted Benzo[1,2-b:4,5-b ']dithiophene Unit: Influence on Photovoltaic Properties
(2015-07-14)
Yuan, Jun
;
Zou, Yingping
;
Cui, Ruth
;
Chao, Yi-Hsiang
;
Wang, Zaiyu
We have designed and synthesized two low bandgap conjugated copolymers containing alternating meta-fluoro-p-alkoxyphenyl- (m-FPO-) or p-fluoro-m-alkoxyphenyl- (p-FPO-) substituted benzodithiophenes-co-benzooxadiazole (BO), named PBO-m-FPO and PBO-p-FPO. The properties, including UV-vis absorption, charge mobility and photovoltaic performance of the two polymers have been intensively investigated. The results indicated that the introduction of fluorine atom at m, p positions of phenyl substituted benzodithiophene unit hardly affected their absorption spectra and highest occupied molecular orbital (HOMO) level. However, the two polymers showed different photovoltaic properties. Power conversion efficiencies (PCEs) based on the device structure of ITO/PEDOT:PSS/polymer:PC71BM/Ca/Al demonstrated a large distinction (5.9% for PBO-m-FPO vs 2.8% for PBO-p-FPO) at optimal weight ratio. When replacing the Ca layer with zirconium acetylacetonate (ZrAcac), using 3% 1,8-diiodooctane (DIO) as the active layer additive, the PCEs of PBO-m-FPO and PBO-p-FPO increased by 36% (8.0% vs 5.9%) and 85% (5.1% vs 2.8%), respectively. The active layer\'s mobilities, morphology and molecular packing resulted in a significant difference in short-circuit current density (J(sc)) and fill factor (FF).
Analysis of Nonlinear Distortion and SSII Cancellation in EAM-Based IMDD OFDM Transmission
(2015-07-15)
Wei, Chia-Chien
;
Cheng, Hsuan-Lin
;
Chen, Hsing-Yu
;
Chen, Yu-Chao
;
Chu, Hsuan-Hao
In terms of second-order nonlinearity, nonlinear distortion in an EAM-based IMDD OFDM system is deterministically modeled as subcarrier-to-subcarrier intermixing interference ( SSII), such that DSP-based nonlinear compensation can be provided by decision-aided SSII cancellation at the receiver. The effectiveness of SSII cancellation heavily relies on the accuracy of SSII calculation, which is determined mainly by the modulation model adopted. This study made comprehensive comparisons of three small-signal models (constant-chirp, dynamic-chirp, and nonlinear-E/O models). We then combined theory and experiment results to examine the characteristics of SSII estimation and cancellation using various models, such as SSII spectra, regression coefficients, and correlation coefficients between the SSII and the total received errors, as well as the relationship between improvements in performance and the correlation coefficient. The nonlinear-E/O model is the most comprehensive, and as a result presents the flattest regression coefficient and highest correlation coefficient, which results in the most pronounced improvement in performance.
Structural, optical, and photoluminescence study of ZnO/IGZO thin film for thin film transistor application
(2015-07-15)
Tiwari, Nidhi
;
Shieh, Han-Ping D.
;
Liu, Po-Tsun
;
光電工程學系
;
顯示科技研究所
Highly transparent and c-axis oriented zinc oxide (ZnO)/indium gallium zinc oxide (IGZO) thin films have been fabricated by R.F. sputtering. The effect of annealing on physical properties of the films was investigated and compared with a-IGZO thin films. The films are wurtzite-type hexagonal structure similar to ZnO with [0 0 0 2] preferred direction and exhibit less density of defects. The TFTs fabricated with ZnO/IGZO films after annealing at 450 degrees C reveal smaller sub-threshold swing (SS similar to 0.52 V/dec) and threshold voltage (Vth similar to 1.3 V) than the TFTs (SS similar to 0.82 V/dec, Vth similar to 13.3 V) of a-IGZO thin film annealed at the same temperature. (C) 2015 Elsevier B.V. All rights reserved.
我相信數學具有一種神秘的統一性 2005 年阿貝爾獎得主拉克斯訪談
(2015-07-15)
勞森（Martin Raussen）、史考（Christian Skau）
;
趙學信
;
Shing-Tung Yau Center
;
丘成桐中心
事實上，我在 1949 年拿到博士學位後，又回洛沙拉摩斯待了一年，之後還有好幾個夏季在那兒擔任顧問。我在洛沙拉摩斯的第一次經歷，特別是後來那段期間，塑造了我的數學思路。首先，那是體驗如何成為科學團隊的一分子，團體的成員不只是數學家，而是有著不同視野的人，研究目的不是證明定理，而是做出產品。這是書本上學不到的，必須要親身參與，所以我鼓勵我的學生至少去洛沙拉摩斯訪問一個夏季。