Browsing by Issue Date, starting with "2014-02-10"

Now showing 1 - 20 of 27646

Intramolecular Interactions of a Phenyl/Perfluorophenyl Pair in the Formation of Supramolecular Nanofibers and Hydrogels
(2014-02-10)
Hsu, Shu-Min
;
Lin, Yu-Chun
;
Chang, Jui-Wen
;
Liu, Yu-Hao
;
Lin, Hsin-Chieh
A new system for the incorporation of a phenyl/perfluorophenyl pair in the structure of a peptide hydrogelator was developed. The strategy is based on the idea that the integration of an end-capped perfluorophenyl group and a phenylalanine with a phenyl moiety in the side chain forms an intramolecular phenyl/perfluorophenyl pair, which can be used to promote the formation of the supramolecular nanofibers and hydrogels. This work illustrates the importance of structure-hydrogelation relationship and provides new insights into the design of self-assembly nanobiomaterials.
High-resistance liquid-crystal lens array for rotatable 2D/3D autostereoscopic display
(2014-02-10)
Chang, Yu-Cheng
;
Jen, Tai-Hsiang
;
Ting, Chih-Hung
;
Huang, Yi-Pai
;
光電工程學系
A 2D/3D switchable and rotatable autostereoscopic display using a high-resistance liquid-crystal (Hi-R LC) lens array is investigated in this paper. Using high-resistance layers in an LC cell, a gradient electric-field distribution can be formed, which can provide a better lens-like shape of the refractive-index distribution. The advantages of the Hi-R LC lens array are its 2D/3D switchability, rotatability (in the horizontal and vertical directions), low driving voltage (similar to 2 volts) and fast response (similar to 0.6 second). In addition, the Hi-R LC lens array requires only a very simple fabrication process. (C) 2014Optical Society of America
Heterodyne moire surface profilometry
(2014-02-10)
Chang, Wei-Yao
;
Hsu, Fan-Hsi
;
Chen, Kun-Huang
;
Chen, Jing-Heng
;
Hsu, Ken Y.
In this study, a novel moire fringe analysis technique is proposed for measuring the surface profile of an object. After applying a relative displacement between two gratings at a constant velocity, every pixel of CMOS camera can capture a heterodyne moire signal. The precise phase distribution of the moire fringes can be extracted using a one-dimensional fast Fourier transform (FFT) analysis on every pixel, simultaneously filtering the harmonic noise of the moire fringes. Finally, the surface profile of the tested objected can be generated by substituting the phase distribution into the relevant equation. The findings demonstrate the feasibility of this measuring method, and the measurement error was approximately 4.3 mu m. The proposed method exhibits the merits of the Talbot effect, projection moire method, FFT analysis, and heterodyne interferometry. (C) 2014 Optical Society of America
Switching mechanism of double forming process phenomenon in ZrOx/HfOy bilayer resistive switching memory structure with large endurance
(2014-02-10)
Huang, Chun-Yang
;
Huang, Chung-Yu
;
Tsai, Tsung-Ling
;
Lin, Chun-An
;
Tseng, Tseung-Yuen
In this Letter, the mechanism of double forming process phenomenon revealing in ZrO2/HfO2 bilayer resistive random access memory structure is investigated. This phenomenon caused by the formation of TiON interfacial layer can be well explained by using the energy band diagram. The TiON interfacial layer will be a tunneling barrier during the first forming process when a negative voltage applied on the device, while it will breakdown when applying a positive voltage. Besides, due to the double forming process, an asymmetric conductive filament with narrower size at ZrO2/HfO2 interface is formed in the device. The point for formation and rupture of the conductive filament can be confined at the ZrO2/HfO2 interface, and it will suppress the consumption of oxygen ions during endurance test. Therefore, high speed (40 ns) and large endurance (10(7) cycles) characteristics are achieved in this device structure. (C) 2014 AIP Publishing LLC.
Thermodielectric generation of defect modes in a photonic liquid crystal
(2014-02-10)
Hsiao, Yu-Cheng
;
Wang, Hsiao-Tsung
;
Lee, Wei
;
光電學院
;
College of Photonics
Photonic defect modes induced by in situ formation of an ill-defined defect layer is demonstrated in a cholesteric liquid crystal (CLC). The local deformation of the one-dimensionally periodic helical structure is achieved by means of the thermodielectric effect, which alters the pitch in the middle of the cholesteric structure. The defect-mode peak in the photonic band gap appears in the transmission spectrum only when the incident circularly polarized light has the same handedness as that of the CLC structure. The wavelength of the deformation-induced defect mode can be tuned upon varying the dielectric heating power by simply applying a frequency-modulated voltage. (C) 2014 Optical Society of America
Anomaly secure detection methods by analyzing dynamic characteristics of the network traffic in cloud communication?
(2014-02-10)
Xiong, Wei
;
Hu, Hanping
;
Xiong, Naixue
;
Yang, Laurence T.
;
Peng, Wen-Chih
Cloud computing represents a new paradigm where computing resources are offered as services in the world via communication Internet. As many new types of attacks are arising at a high frequency, the cloud computing services are exposed to an increasing amount of security threats. To reduce security risks, two approaches of the network traffic anomaly detection in cloud communications have been presented, which analyze dynamic characteristics of the network traffic based on the synergetic neural networks and the catastrophe theory. In the former approach, a synergetic dynamic equation with a group of the order parameters is used to describe the complex behaviors of the network traffic system in cloud communications. When this equation is evolved, only the order parameter determined by the primary factors can converge to 1. Then, the anomaly can be detected. In the latter approach; a catastrophe potential function is introduced to describe the catastrophe dynamic process of the network traffic in cloud communications. When anomalies occur, the state of the network traffic will deviate from the normal one. To assess the deviation, an index named as catastrophe distance is defined. The network traffic anomaly can be detected by the value of this index. We evaluate the performance of these two approaches using the standard Defense Advanced Research Projects Agency data sets. Experimental results show that our approaches can effectively detect the network traffic anomaly and achieve the high detection probability and the low false alarms rate. (C) 2013 Published by Elsevier Inc.
Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay
(2014-02-10)
An, F. P.
;
Balantekin, A. B.
;
Band, H. R.
;
Beriguete, W.
;
Bishai, M.
A measurement of the energy dependence of antineutrino disappearance at the Daya Bay reactor neutrino experiment is reported. Electron antineutrinos ((v) over bar (e)) from six 2.9 GW(th) reactors were detected with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls. Using 217 days of data, 41 589 (203 809 and 92 912) antineutrino candidates were detected in the far hall (near halls). An improved measurement of the oscillation amplitude sin(2) 2 theta(13) = 0.090(-0.009)(+0.008) and the first direct measurement of the (v) over bar (e) mass-squared difference vertical bar Delta m(ee)(2)vertical bar = (2.59(-0.20)(+0.19) x 10(-3) eV(2)) is obtained using the observed (v) over bar (e) rates and energy spectra in a three-neutrino framework. This value of vertical bar Delta m(ee)(2)vertical bar eejis consistent with vertical bar Delta m(mu mu)(2)vertical bar measured by muon neutrino disappearance, supporting the three-flavor oscillation model.
Flexible-textured polydimethylsiloxane antireflection structure for enhancing omnidirectional photovoltaic performance of Cu(In,Ga)Se-2 solar cells
(2014-02-10)
Kuo, Shou-Yi
;
Hsieh, Ming-Yang
;
Han, Hau-Vei
;
Lai, Fang-I
;
Chuang, Tsung-Yeh
Because of the Sun's movement across the sky, broadband and omnidirectional light harvesting is a major development in photovoltaic technology. This study reports the fabrication and characterization of flexible-textured polydimethylsiloxane ( PDMS) film on Cu(In,Ga)Se-2 (CIGS) solar cells, which is one of the simplest and cheapest peel-off processes for fabricating a three-dimensional structure. A cell containing a textured PDMS film enhanced the short-circuit current density from 22.12 to 23.93 mA/cm(2) in a simulated one-sun scenario. The omnidirectional antireflection of CIGS solar cells containing various PDMS films is also investigated. This study uses an angle-resolved reflectance spectroscope to investigate the omnidirectional and broadband optical properties of the proposed PDMS film. This improvement in light harvesting is attributable to the scattering of the PDMS film and the gradual refractive index profile between the PDMS microstructures and air. The flexible-textured PDMS film is suitable for creating an antireflective coating for a diverse range of photovoltaic devices. (C) 2014 Optical Society of America
Suspended GaN-based band-edge type photonic crystal nanobeam cavities
(2014-02-10)
Wu, Tzeng Tsong
;
Chen, Hao Wen
;
Lan, Yu Pin
;
Lu, Tien Chang
;
Wang, Shing Chung
We demonstrated GaN-based photonic crystal (PC) nanobeam cavities by using the e-beam lithography and the suspended nanobeams were realized by focused-ion beam (FIB) milling. One resonant mode was clearly observed at 411.7 nm at 77K by optical pumping. The quality factor was measured to be to 7.4 x 10(2). Moreover, the degree of polarization value was measured to be 40%. The temperature-dependent characteristics were measured and discussed, which unambiguously demonstrated that the observed resonant peak originated from the band-edge mode of the one-dimensional PC nanobeam. (C) 2014 Optical Society of America
用於多用戶多輸入多輸出正交分頻多工系統的資源配置方法及其裝置
(2014-02-11)
王蒞君
;
葉俥榮
本發明的示範實施例提供了一種用於多用戶多輸入多輸出正交分頻多工系統的資源配置方法及其裝置。此多用戶多輸入多輸出正交分頻多工系統具有多個用戶和子通道。此多個子通道根據容量比率限制以及排程規則被指定給此多個用戶，接著再根據此多用戶多輸入多輸出正交分頻多工系統的極限功率決定每一個用戶的功率。其中，被指定給某個用戶的各個子通道之間的分配功率值是相同的。另外，排程規則可以是極大－極小或極大比率總和規則，而且子通道的配置方式可以為用戶導向的或者子通道導向。
光學全像資料讀取系統
(2014-02-11)
孫慶成
;
余業緯
;
吳啟守
;
林烜輝
本發明係關於一種光學全像資料讀取系統，係配合一記錄裝置，用於讀取儲存於記錄裝置之資料，該系統包括：一光發射裝置，用以發射一讀取光束至記錄裝置之複數個記錄位置以分別產生複數個反射光束，其中該等記錄位置係對應至記錄裝置表面一特定位置，並分別位於一預定深度；一感測裝置，係接收該等反射光束，且該等反射光束分別成像於感測裝置之不同位置；以及一控制裝置，係分別與光發射裝置及感測裝置耦合，以控制光發射裝置，並將該等反射光束於感測裝置的複數個成像對應轉換為複數個訊號，以讀取出記錄於記錄裝置上之資料。
倒置式有機太陽能元件及其製作方法
(2014-02-11)
陳方中
;
吳志力
;
洪毅
本發明係有關於一種倒置式有機太陽能元件及其製作方法，其中，倒置式有機太陽能元件係包括：一基板；一第一電極，係位於基板上；一有機主動層，係位於第一電極上；一光學間隙物，其包括一緩衝層、以及一光學介面層，緩衝層係位於有機主動層上，而光學介面層係層疊於緩衝層上，使緩衝層位於有機主動層與光學介面間；以及一第二電極，係位於光學間隙物上。藉由設置此適當厚度之光學間隙物，可增加有機主動層光的吸收，進而提升有機太陽能元件之能量轉換效率。
高複雜度運輸地圖在有限空間中之顯像方法
(2014-02-11)
王昱舜
;
紀明德
本發明提供一種高複雜度運輸地圖在有限空間中之顯像方法，針對使用者所指定的起訖車站與中間所有經過的路線，對運輸路線進行不等比例的簡化變形，將站點之間的線段設為等長，將路線方向平角化，並微調站點的位置，以符合螢幕顯示區域之大小比例，便於閱讀，再於行經路線的站點附近標上名稱標誌，有助於使用者迅速瞭解乘車及轉乘資訊。
On-chip noise filter circuit
(2014-02-11)
Ker Ming-Dou
;
Yen Cheng-Cheng
;
Chen Tung-Yang
A noise filter circuit for an IC is provided. The noise filter circuit comprises a decoupling unit coupled to a power pad of the IC and a current amplifier circuit coupled to the decoupling unit and the power pad of the IC. The decoupling unit generates a first current in response to a transient voltage being on the power pad of the IC. The current amplifier circuit drains a second current from the power pad of the IC according to the first current.
一種適地性服務系統及方法
(2014-02-11)
陳昱嘉
;
王蒞君
一種適地性服務系統及方法，係令與通訊裝置及雲端數據伺服器連結的適地性服務伺服器分別於註冊模式及服務模式中利用不易被修改或偽造之通訊裝置之國際移動用戶識別碼(international mobile subscriber identity)進行註冊驗證流程及服務驗證流程，俾供使用者透過通訊裝置獲得特定之適地性服務結果，而此分散式驗證技術不但能有效降低資料被竊取之風險，亦能提高服務取得之彈性與便利性。
處理一分頻多工訊號之系統及方法
(2014-02-11)
王海薇
;
林大衛
;
桑梓賢
一種處理一分頻多工訊號的方法，該分頻多工訊號在通道上傳輸，且該方法包含接收該分頻多工訊號，其中該分頻多工訊號的各載波上存在一殘留的載波間干擾與一通道雜訊，且該殘留的載波間干擾來自時變通道或載波頻率漂移，並對該分頻多工訊號進行環字首移除和離散傅利葉轉換，以獲得一頻域訊號，並分析該頻域訊號以獲得該頻域訊號之相鄰載波上的該殘留的載波間干擾與該通道雜訊之相關函數統計特性，且根據該相關函數統計特性，對該分頻多工訊號進行一通訊訊號處理。
Selective motion vector prediction method, motion estimation method and device thereof applicable to scalable video coding system
(2014-02-11)
Li Gwo-Long
;
Huang Hsiao-Shan
;
Chang Tian-Sheuan
A selective motion vector prediction method and a motion estimation method and a device thereof applicable to a scalable video coding (SVC) system are disclosed. The selective motion vector prediction method includes the steps of performing an inter prediction to obtain a first motion vector prediction center; performing an inter-layer motion prediction to obtain a second motion vector prediction center; in the case the first and the second motion vector prediction center satisfying a preset condition, using the same reference data to calculate the rate-distortion costs for the inter prediction and the inter-layer motion prediction; and using the rate-distortion costs as a basis to select one of the inter prediction and the inter-layer motion prediction for applying to the SVC system. Thus, the same reference data is shared to enable reduced memory access in the process of coding and accordingly, reduced cost of and power consumption by memory access.
Exploring the distinction between experimental resonant modes and theoretical eigenmodes: From vibrating plates to laser cavities
(2014-02-12)
Tuan, P. H.
;
Wen, C. P.
;
Yu, Y. T.
;
Liang, H. C.
;
Huang, K. F.
Experimentally resonant modes are commonly presumed to correspond to eigenmodes in the same bounded domain. However, the one-to-one correspondence between theoretical eigenmodes and experimental observations is never reached. Theoretically, eigenmodes in numerous classical and quantum systems are the solutions of the homogeneous Helmholtz equation, whereas resonant modes should be solved from the inhomogeneous Helmholtz equation. In the present paper we employ the eigenmode expansion method to derive the wave functions for manifesting the distinction between eigenmodes and resonant modes. The derived wave functions are successfully used to reconstruct a variety of experimental results including Chladni figures generated from the vibrating plate, resonant patterns excited from microwave cavities, and lasing modes emitted from the vertical cavity.
METHOD FOR MANUFACTURING ORGANIC ELECTRONIC COMPONENT HAVING SLAT COMPOUND
(2014-02-13)
MENG Hsin-Fei
;
Lin Hao-Wu
;
Horng Sheng-Fu
;
Zan Hsiao-Wen
;
Chang Hao-Wen
A method for manufacturing an organic electronic component is provided. The method includes steps of providing a substrate and an organic material; coating the organic material onto the substrate; heating the substrate to form a first carrier transport layer; doping a material having a metal ion to an organic solvent to form an organic solution; and applying the organic solution onto the first carrier transport layer to form a second carrier transport layer.
Real-Time Spectroscopy of Single-Walled Carbon Nanotubes for Negative Time Delays by Using a Few-Cycle Pulse Laser
(2014-02-13)
Kobayashi, Takayoshi
;
Nie, Zhaogang
;
Xue, Bing
;
Kataura, Hiromichi
;
Sakakibara, Youichi
Several investigations using the femtosecond pump-probe technique have been made for coherent phonon dynamics in single-walled carbon nanotubes (SWNTs), which are promising candidates as devices for nanoelectronics and photonics due to their unique properties. However, the most relevant spectroscopic analyses by far have been performed in the positive time range, with the pump pulse coming before the probe. We studied the real-time coherent phonon in SWNTs using 7.1-fs pump-probe measurements for negative time delays in which vibronic coherence between the ground state and exciton state can be observed. Coherent vibrations corresponding to the radial breathing mode caused by the wave packet generated in the exciton state were detected, in contrast to the ground-state wave packet dynamics for positive delays previously reported. The present results show that excited-state wave packets contribute greatly to radial breathing modes in four, (6,5), (6,4), (7,5), and (8,3), chiral systems, but very little to G modes, even though the oscillation period of the latter is 20 fs, which is much shorter than the 100 fs of the exciton life. We discussed the differences in dephasing times in the four different chiral systems.