Browsing by Issue Date, starting with "2012-12-28"

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Melting behavior of Ag-14 cluster: An order parameter by instantaneous normal modes
(2012-12-28)
Tang, Ping-Han
;
Wu, Ten-Ming
;
Hsu, P. J.
;
Lai, S. K.
;
物理研究所
This paper studies the melting behavior of Ag-14 cluster employing the instantaneous normal mode (INM) analysis that was previously developed for bimetallic cluster Ag17Cu2. The isothermal Brownian-type molecular dynamics simulation is used to generate atom configurations of Ag-14 at different temperatures up to 1500 K. At each temperature, these atomic configurations are then analyzed by the INM technique. To delve into the melting behavior of Ag-14 cluster which differs from Ag17Cu2 by the occurrence of an anomalous prepeak in the specific heat curve in addition to the typical principal peak, we appeal to examining the order parameter tau(T) defined in the context of the INM method. Two general approaches are proposed to calculate tau(T). In one, tau(T) is defined in terms of the INM vibrational density of states; in another, tau(T) is defined considering the cluster as a rigid body with its rotational motions described by three orthogonal eigenvectors. Our results for Ag-14 by these two methods indicate the mutual agreement of tau(T) calculated and also the consistent interpretation of the melting behavior with the specific heat data. The order parameter tau(T) provides in addition an insightful interpretation between the melting of clusters and the concept of broken symmetry which has been found successful in studies of the melting transition of bulk systems. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772096]
Time-frequency resolved analysis of a nanosecond supercontinuum source dedicated to multiplex CARS application
(2012-12-31)
De Angelis, Annalisa
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Labruyere, Alexis
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Couderc, Vincent
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Leproux, Philippe
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Tonello, Alessandro
In this paper, we describe and investigate the properties of a broadband source designed from a nanosecond microchip laser operating at high repetition rate and dedicated to multiplex-CARS application. We demonstrate that a strong reshaping of the initial pulse profile drastically affects the Stokes wave and therefore represents an important limitation in CARS experiment. In particular, we emphasize the saturation effect of the peak power of the Stokes wave resulting from supercontinuum generation. However, we show that this type of compact system can be particularly suitable for achieving CARS measurement. (C) 2012 Optical Society of America
藥物-蛋白質網路與結構系統生物探討癌症與神經系統失調---藥物-蛋白質同源網路探討藥物開發與結合機制(總計畫及子計畫1)(III)
(2013)
楊進木
;
YANG JINN-MOON
;
國立交通大學生物科技學系（所）
PMR: Personalized Mobile Restaurant System
(2013)
Daraghmi, Eman Yasser
;
Yuan, Shyan-Ming
;
資訊工程學系
;
Department of Computer Science
Personalized mobile applications involve deploying the existing technologies to accommodate the differences between individuals. The existing applications have undertaken with the price and the location factors in mind. They show the same results regardless the personal special needs of consumers. The realization of the next generation of personalized systems will be a challenging task. For our research purpose, the personal special needs are defined as: (Religions, Cultures, Allergies, Health Condition, Diet, Preferences and Dislikes) needs that affect many aspects of a consumer life. In general there is no shortage of the restaurant apps available in the App_Store, However, many of these apps are based on regular factors such as price and location. They are not a great choice for consumers with personal special needs. This paper proposes a novel "Personalized Mobile Restaurant" PMR system. To meet the strict needs of consumers; a requirement driven design approach was followed. The proposed system was tested successfully and promising results were obtained.
Batteryless 275mV Startup Single-Cell Photovoltaic Energy Harvesting System for Alleviating Shading Effect
(2013-01-01)
Huang, Chao-Jen
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Su, Yi-Ping
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Chen, Ke-Horng
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Huang, Li-Ren
;
Chu, Fang-Chih
without any batteries, a low input voltage converter is presented for a single-cell (SC) photovoltaic (PV) energy harvesting to alleviate the energy degradation due to shading effect. The proposed low voltage startup (LVS) circuit with low input voltage of 275 mV and less than 840 ms startup time achieves high voltage conversion ratio to supply a high accuracy bandgap reference. Experimental results show the maximum power throughput is up to 6 mW and the quiescent power is less than 650 mu W with integrated two buck-boost converters and two boost converters. The peak efficiency of the boost converter can be up to 75.8% for ultra-low voltage hearing aid systems.
An Online Recursive ICA Based Real-time Multi-channel EEG System on Chip Design with Automatic Eye Blink Artifact Rejection
(2013)
Liao, Jui-Chieh
;
Shih, Wei-Yeh
;
Huang, Kuan-Ju
;
Fang, Wai-Chi
;
電子工程學系及電子研究所
This paper presents an online recursive ICA (ORICA) based real-time multi-channel EEG system on chip design with automatic eye blink artifact rejection. Since EEG signals are very feeble, they are easy to be contaminated by artifacts. Among all artifacts, eye blink artifact dose the most significant harm to EEG signals. For acquiring artifact free EEG signals, ICA is a popular method for artifacts extraction. After extraction of ICA, eye blink artifacts are rejected to improve the reliability of EEG applications such as brain computer interfaces (BCIs). To promote the feasibility and convenience of BCIs, a real-time ICA algorithm, ORICA, is adopted in this system. With ORICA, the system immediately finishes each ICA result after each sample time. After each ICA result is generated, the automatic eye blink artifact rejection and inverse ICA are performed to acquire eye blink artifact free EEG signals in real-time. For system portability and high integration, a front-end interface of commercial IC, ADS1298 provided by TI, and Bluetooth interface, UART, are implemented. The system is designed used TSMC 90nm CMOS technology with 8 channels EEG processing in 128 Hz sample rate of raw data and consumes 8.56 mW at 50 MHz clock rate. The design methods of the proposed EEG system are provided in this paper. The performance and processing results of the system are also shown to reach 0.2532 s latency after each EEG sample time.
價格限制市場之選擇權定價模型與避險策略分析
(2013)
郭家豪
;
Guo Jia Hau
;
國立交通大學財務金融研究所
價格限制是許多金融市場常見的人為市場穩定措施，但是卻少有文獻或研究探討價格限制對個股選擇權定價及避險策略的影響。本研究將聚焦於在價格限制市場中具流動性風險的個股選擇權相關定價與避險問題的探討。藉由所求之封閉解提供的效率性，本研究將在價格限制與有限流動性的考量下，比較數種標準避險策略如delta、 delta-gamma、 delta-vega 和delta-gamma-vega 等於歐式選擇權避險績效的差異，藉此衡量價格限制與有限流動性對避險策略之影響。另外，藉由市場資料調校後的個股流動性模型參數之時間數列，將有助於了解信貸危機發生時市場流動性的變化為何。
Miniaturized Dual-Band Composite Right/Left-Handed Crossover
(2013)
Hsieh, Sheng-Yu
;
Chi, Pei-Ling
;
資訊工程學系
;
Department of Computer Science
In this paper, an arbitrary dual-band and miniaturized crossover is proposed using the composite right/left-handed (CRLH) transmission structures. The proposed crossover is based on the two-section CRLH branch lines of three different characteristic impedances where one degree of design freedom can be used for implementation convenience. Combining the CRLH implementation approach with the even-and odd-mode analysis results, a simple design procedure is developed. To support our idea, a dual-band crossover operating at 0.9 GHz and 2.45 GHz was fabricated and tested. The experimental results are in good agreement with the simulated data. Compared to the reported dual-band crossovers based on the printed-circuit-board (PCB) technology, our presented crossover shows a significant size reduction by about 59% with respect to the smallest footprint found in the literature.
多視點視訊產生、傳輸與分析-子計畫三：機器學習方法於視訊編碼與處理應用
(2013)
彭文孝
;
PENG WEN-HSIAO
;
國立交通大學資訊工程學系（所）
國立交通大學資訊工程學系計畫名稱：機器學習方法於視訊編碼與處理應用計畫主持人：彭文孝（主持人）經費來源：行政院國家科學委員會關鍵字：機器學習、高效能視訊編碼、精簡描述子應用於視覺化搜尋、編碼端控制、視覺化搜尋本子計晝利用機器學習（Machine Learning)為視訊編碼與處理的應用設計高效能演算法。近年來由於大量影像及影片資料的產生與取得變得容易，以往模型導向 (Model-based)在視訊編碼與處理中存在的一些問題，可望用資料導向（Data-driven) 的方式來解決。又機器學習的方法非常適合處理資料導向的問題，因此本子計晝目標為利用機器學習的方法，針對（1)高效能視訊編碼（High Efficiency Video Coding, HEVC) 與（2)精簡描述子應用在視覺化搜尋（Compact Descriptors for Visual Search, CDVS) 兩項ISO/IEC MPEG與ITU-T VCEG正在開發的標準，為視訊編碼及處理兩項重要的多媒體應用，設計高效能之演算法。前兩年我們會參與HEVC及CDVS之標準制定會議。同時計晝（1)第一年產生大量HEVC編碼訓練資料，以機器學習方法解決分群及參數估測問題，完成HEVC編碼端快速模式決策、快速位元率控制及快速編碼工具參數產生之演算法開發；（2)第二年解決目前CDVS資料庫決定代表點的問題，使用機器學習方式分析並設計更好的代表點選擇演算法，以及使用機器學習的方法設計使用多種比對演算法之搭配方式，達到更高的比對準確率；（3)第三年基於兩項完成的標準，設計增進原有的演算法效能之方法，以及改進演算法使其適用硬體設計。由於兩項標準在兩年内就會完成，本子計晝發展之研究與演算法趕上標準的時程，將在隨之而來的應用上具有重要的影響力。
The Analysis of Nano-Patterned Sapphire Substrates-Induced Compressive Strain to Enhance Quantum-Confined Stark Effect of InGaN-Based Light-Emitting Diodes
(2013-01-01)
Chen, Po-Hsun
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Su, Vincent
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You, Yao-Hong
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Lee, Ming-Lun
;
Hsieh, Cheng-Ju
This paper demonstrates that the quantum-confined stark effect of InGaN-based light-emitting diodes can be enhanced by the means of using the hexagonal nano-post patterned sapphire substrates based on the increase of the post-duty cycle.
Formation of size-tunable dandelion-like hierarchical rutile titania nanospheres for dye-sensitized solar cells
(2013)
Lan, Chi-Ming
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Liu, Shang-En
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Shiu, Jia-Wei
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Hu, Jyun-Yu
;
Lin, Meng-Hung
A sol-gel method with a modified solvent comprising of three simple steps under low-temperature conditions was used to synthesize mono-disperse rutile TiO2 nanospheres with dandelion-like hierarchical morphology (DHRS) as a light-scattering layer for dye-sensitized solar cells (DSSC). 1,2-Ethanediol (ED) served as a key retardation agent in the second step at 25 degrees C to slow the hydrolysis and condensation of the TiCl4 aqueous solution prepared in the first step at 0 degrees C; the subsequent nucleation of a rutile type phase occurred homogeneously in the third step at 70 degrees C to generate the rutile TiO2 nanospheres with highly uniform sizes. The spherical sizes of DHRS were well controlled with the volume ratios of the ED-water solvent mixture in the second step, for which the DHRS of diameter 650-200 nm were produced from the solvent system containing 5-25% ED. A detailed mechanism is presented to rationalize the formation of nanospheres of uniform size in six steps: 1) hydration and hydrolysis, 2) hydrolysis and retardation, 3) hydrolysis and condensation, 4) homogeneous nucleation, 5) aggregation and growth of rod-like crystals and 6) DHRS formation. The DSSC device with a scattering layer made of DHRS (size similar to 300 nm) performed comparably to that with a scattering layer made of a commercially available TiO2 paste, making this nano-material a cost-effective alternative for future DSSC commercialization.
A Fully Integrated 8-Channel Closed-Loop Neural-Prosthetic SoC for Real-Time Epileptic Seizure Control
(2013-01-01)
Chen, Wei-Ming
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Chiueh, Herming
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Chen, Tsan-Jieh
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Ho, Chia-Lun
;
Jeng, Chi
Process-Variation-Aware Iddq Diagnosis for Nano-Scale CMOS Designs - The First Step
(2013-01-01)
Chang, Chia-Ling (Lynn)
;
Wen, Charles H. -P
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Bhadra, Jayanta
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電機工程學系
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Department of Electrical and Computer Engineering
Along with the shrinking CMOS process and rapid design scaling, both Iddq values and their variation of chips increase. As a result, the defect leakages become less significant when compared to the full-chip currents, making them more in-distinguishable for traditional Iddq diagnosis. Therefore, in this paper, a new approach called s-Iddq diagnosis is proposed for reinterpreting original data and diagnosing failing chips, intelligently. The overall flow consists of two key components, (1) s-Iddq transformation and (2) defect-syndrome matching: s-Iddq transformation first manifests defect leakages by excluding both the process-variation and design-scaling impacts. Later, defect-syndrome matching applies data mining with a pre-built library to identify types and locations of defects on the fly. Experimental results show that an average of 93.68% accuracy with a resolution of 1.75 defect suspects can be achieved on ISCAS'89 and IWLS'05 benchmark circuits using a 45nm technology, demonstrating the effectiveness of s-Iddq diagnosis.
互補式場效電晶體元件的高介電質材料電性
(2013)
荊鳳德
;
CHIN ALBERT
;
國立交通大學電子工程學系及電子研究所
高介電材料已經運用在 45 奈米的互補式場效電晶體、動態隨機存取記憶體與非揮發性記憶體。根據Intel 的共同創造者，高登摩爾的說法「從1960 年後期，高介電材料與金屬閘極材料對傳統使用結晶矽的閘極電晶體有了重大改變」。因此，根據高登摩爾的理論，運用此技術將有可能獲得諾貝爾獎。在之前，我們是使用高介電材料Al2O3 (發表於Intel. MBE Conference 1998；Symp. On VLSI 1999)與 La2O3 (發表於Symp. On VLSI 2000) 當閘極介電材料的先驅。而這兩種高介電材料Al2O3 與La2O3 已經被IBM，AMD，Toshiba，Renseas，IMEC，SEMATECH 等公司並且與HfSiO 整合在Gate-first 製程中，且成功的在32 奈米技術中做出低的「臨界電壓」之n 與p 型互補式場效電晶體。然而，雖然J. Robertson 已經成功的提出電荷轉移模型，不過一些詳細的機制我們還是不了解。儘管我們的研究已經成功提出介面反應所產生的氧空隙缺陷模型，而且東京大學A. Toriumi 已提出的電荷耦極的模型，但是其中的費米能階的札釘效應導致的不理想的高臨界電壓，這也是仍然需要進一步研究的。不幸地，基本的理論將會是微縮等效氧化層厚度(EOT)關鍵。此困難度可以從Intel 45 奈米結點1 奈米的EOT 到32 奈米結點只緩慢的微縮到0.9 奈米。而為了解決此問題，這也是台灣荊鳳德教授實驗室與俄羅斯西伯利亞分學院半導體物理研究所的Gritsenko Vladimir Alexeevich 博士與他的團隊提出此計畫的目的，俄羅斯團隊有很強的物理背景知識，而台灣荊教授實驗室則是對於元件有很強的製作能力，這將是此合作的優勢。我們也將根據物理知識，目標製作出新的元件並解決EOT 無法繼續微縮的問題。因此，也是台俄雙方運用科學與科技整合的優勢。
阿秒原子分子物理的研究
(2013)
江進福
;
JIANG TSIN-FU
;
國立交通大學物理研究所
微電子工程學門研究發展及推動規劃小組計畫
(2013)
曾俊元
;
TSENG TSEUNG-YUEN
;
國立交通大學電子工程學系及電子研究所
A Green Radio Resource Allocation Scheme for LTE-A CoMP Systems with Multimedia Traffic
(2013)
Chung, Wen-Ching
;
Chang, Chung-Ju
;
Huang, Chin-Ya
;
Teng, Hsin-Ying
;
電機資訊學士班
In this paper, we propose a green radio resource allocation (GRRA) scheme for LTE-A downlink systems with coordinated multi-point (CoMP) transmission to support multimedia traffic. It is a crucial issue to find a balance between throughput maximization and transmission power minimization, especially when the QoS requirement guarantee for multimedia traffic is considered. The GRRA scheme defines a green radio utility function by considering required transmission power, assigned modulation order, and coordinated transmission nodes. Based on this utility function, it coordinates transmission nodes to deliver data on suitable subchannels with suitable transmission power. Simulation results show that, the GRRA scheme can save the transmission power by 33.9% and 40.1%, as compared to the adaptive radio resource allocation scheme [5] with CoMP and the utility-based radio resource allocation scheme [6] with CoMP, respectively. Besides, it enhances the system throughput by 5.5% and improves the Jain fairness index for best effort users by 155% over these two schemes.
奈米液珠和胜?-奈米金複合物奈米系統的熱力學及動力學研究
(2013)
黃國華
;
HUANG GUEWHA STEVEN
;
國立交通大學奈米科技研究所
在目前的生物醫學研究範疇中，生物分子與奈米介面的物理特性已儼然成為當今最重要的課題，尤其於組織工程與藥物釋放具有極大的應用價值。當奈米級表面與蛋白質進行物理性的交互作用，所產生的影響可能具有改變蛋白質結構形態，並導致蛋白質功能的未知變化。然而相關的主要結構性與物理性變化的研究至今仍處早期摸索階段。生物分子與奈米介面的交互作用有可能是專一性或非專一性的結合，而在本實驗室先前的研究發現，免疫球蛋白具有專一性辨識奈米金粒子的特性。(Huang, Chen et al. 2006; Chen, Hung et al. 2008; Chen, Hung et al. 2010; Hung, Pan et al. 2010)我們也發現奈米金粒子對於溶菌酶的物理性作用為非專一性反應，並影響溶菌酶的功能變化與外部構形，經由圓二色光譜(CD)分析得到，在溶菌酶與奈米金粒子作用後的確改變了蛋白質自身的二級結構，而構形的改變程度則取決於奈米金粒子的粒徑大小，尤其當奈米金粒徑小於2~3 奈米，其構形變化有明顯的提升。經NMR 液相光譜分析亦顯示溶菌酶蛋白質結構會被奈米金粒所影響，在TOXY 以及COSY 光譜分析結果中，溶菌酶與2nm 奈米金結合後在指紋區有輕微的頻率性改變，意味著溶菌酶的蛋白質構形變換是由於與2nm 奈米金反應後的結果。為了進一步研究奈米金粒子對溶菌酶蛋白質結構的影響，我們以 2nm、5nm 奈米金與溶菌酶共結晶的觀點作為探討，藉由結晶構形分子模型的分析可得到主要的結構變化。然而目前的實驗結果，仍難以對奈米金誘導蛋白質產生物理性結構變化現象作出一個完整的邏輯性規則。因此為了探討並歸類出奈米金與蛋白質構形之間的作用機制，我們利用胜肽分子與奈米金作結合，並以CD 光譜分析後發現蛋白質螺旋結構有顯著的改變。接續的實驗模型將以探討胜肽- 奈米金複合物的摺疊結構及熱力學為主軸。本計劃主要目的 1.分析胜肽分子與不同粒徑奈米金粒子接合後的分子構形變化。 2.研究以物理性熱力學參數改變胜肽分子與奈米金粒子的結合反應。 3.探討胜肽分子與奈米金粒子的動力學機制。
Sample Preparation for Many-Reactant Bioassay on DMFBs using Common Dilution Operation Sharing
(2013)
Liu, Chia-Hung
;
Chang, Hao-Han
;
Liang, Tung-Che
;
Huang, Juinn-Dar
;
電子工程學系及電子研究所
Sample preparation is an essential processing step in most biochemical applications. Various reactants are mixed together to produce a solution with the target concentration. Since reactants generally take a notable part of the cost in a bioassay, their usage should be minimized whenever possible. In this paper, we propose an algorithm, CoDOS, to prepare the target solution with many reactants using common dilution operation sharing on digital microfluidic biochips (DMFBs). CoDOS first represents the given target concentration as a recipe matrix, and then identifies rectangles in the matrix, where each rectangle indicates an opportunity of dilution operation sharing for reactant minimization. Experimental results demonstrate that CoDOS can achieve up to 27% of reactant saving as compared with the bit-scanning method in single-target sample preparation. Moreover, even if CoDOS is not developed for multi-target sample preparation, it still outperforms the recent state-of-the-art algorithm, RSMA. Hence, it is convincing that CoDOS is a better alternative for many-reactant sample preparation.
Terahertz gas sensing utilizing multilayer-stacked micro-porous polymer structure
(2013-01-01)
Ho, Cheng-Han
;
You, Borwen
;
Chan, Ming-Che
;
Lu, Ja-Yu
;
光電學院
A simple multilayer micro-porous structure has been successfully demonstrated for identifying different types and concentrations of vapor molecules. The measured minimum concentration is achieved 9 ppm, corresponding to molecular density variation of 0.16 nano-mole/mm(3).