Browsing by Issue Date, starting with "2009-03-09"

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Differential Sensing of Serine and Tyrosine with Aligned CdS Nanowire Arrays Based on pH-Dependent Photoluminescence Behavior
(2009-03-09)
Lin, Yi-Feng
;
Hsu, Yung-Jung
;
Cheng, Wei-Yun
;
Lu, Shih-Yuan
;
材料科學與工程學系
The differential sensing of tyrosine and serine is achieved with well-aligned CdS nanowire arrays by exploring the pH-dependent photoluminescence behavior of the nanowire arrays toward exposure to the two amino acid solutions. The contrasting trend in photoluminescence (PL) intensity with respect to variations in analyte concentration observed at pH 11 served as the check point for the present differential sensing. The application format of the nanowire array is better suited for further sensing device assembly than that of nanocrystal suspensions.
Cobalt nanodots formed by annealing the CoSiO layer for the application of the nonvolatile memory
(2009-03-09)
Hu, Chih-Wei
;
Chang, Ting-Chang
;
Tu, Chun-Hao
;
Shueh, Pei-Kun
;
Lin, Chao-Cheng
Co nanodot memory devices formed by oxidation processes were studied. Transmission electron microscopy and x-ray photoelectron spectroscopy analyses showed that overoxidation of the cobalt and silicon degraded the charge-storage ability seriously. However, a precapped oxide can mildly oxidize the CoSi(2) film to protect the overoxidation to occur. In addition, an oxygen-incorporated CoSi(2) film is proposed to improve the oxidation process further. Through incorporating the limited oxygen during sputtering process, the Co nanodot memory device obtains a larger memory window. Also, the reliability characteristic of the Co nanodot memory device formed by annealing the oxygen-incorporated CoSi(2) film has been demonstrated.
Solid State and Solution Self-Assembly of Helical Polypeptides Tethered to Polyhedral Oligomeric Silsesquioxanes
(2009-03-10)
Kuo, Shiao-Wei
;
Lee, Hsin-Fang
;
Huang, Wu-Jang
;
Jeong, Kwang-Un
;
Chang, Feng-Chih
New macromolecular self-assembling building blocks, polyhedral oligo- silsesquioxane (POSS)-helical polypeptide copolymers, have been synthesized through the ring-opening polymerization (ROP) of gamma-benzyl-L-glutamate N-carboxyanhydride (gamma-Bn-Glu NCA) using aminopropyl isobutyl-POSS as a macroinitiator. The incorporation of POSS units at the chain ends of PBLG moieties has two important effects: allowing intramolecular hydrogen bonding between the POSS and PBLG units to enhance the latter's a-helical conformations in the solid state and preventing the aggregation of nanoribbons through the POSS blocks' protrusion from the ribbons to allow the formation of clear gels in solution.
Method for forming a semiconductor structure having nanometer line-width
(2009-03-10)
Chen
;
Szu-Hung
;
Lien
;
Yi-Chung
;
Chang
A method for forming a semiconductor structure having a deep sub-micron or nano scale line-width is disclosed. Structure consisting of multiple photoresist layers is first formed on the substrate, then patterned using adequate exposure energy and development condition so that the bottom photoresist layer is not developed while the first under-cut resist groove is formed on top of the bottom photoresist layer. Anisotropic etching is then performed at a proper angle to the normal of the substrate surface, and a second resist groove is formed by the anisotropic etching. Finally, the metal evaporation process and the lift-off process are carried out and the Γ-shaped metal gate with nano scale line-width can be formed.
Active deformation of Tainan tableland of southwestern Taiwan based on geodetic measurements and SAR interferometry
(2009-03-10)
Huang, Mong-Han
;
Hu, Jyr-Ching
;
Ching, Kuo-En
;
Rau, Ruey-Juin
;
Hsieh, Chia-Sheng
The D-InSAR technique is applied to detect the active fault-related folding structure of the Tainan tableland near the deformation front in SW Taiwan by using ERS SAR images during 1996-2000. The Tainan tableland is located in-between a blind fault in the west and the Houchiali fault in the east, thus the Tainan tableland is interpreted as a pop-up structure in a fold-thrust belt at active tectonic margin. Interferometric processing of six SAR images reveals the average slant range deformation (SRD) as similar to 12.5 mm/yr. The uplift rate is higher in eastern Tainan tableland than that in western Tainan tableland, and it increases from west edge of Tainan tableland and decreases across the Houchiali fault. The campaign-mode GPS data set from 1999 to 2003 indicate an average horizontal movement of 12 +/- 4 mm/yr in the direction of N44 degrees W for the Tainan tableland with respect to western coastline. Furthermore 5 precise leveling surveys across Tainan tableland over a period of 2 years show an uplift rate of similar to 14 mm/yr for the benchmarks on the tableland. Based on the 2-D analytical solution with the constraint of he inferred fault geometry, the slip rate along the inferred Tainan fault is similar to 16 mm/yr, similar to 10 mm/yr along the Houchiali fault, and similar to 25 mm/yr along the inferred Chungchou fault. Consequently we propose that active deformation of the Tainan tableland is likely resulted from the freely slipping of the Tainan fault and the Houchiali fault. The locking depth should be located on the deeper part of decollement, eastern of the Chungchou fault. In addition, the combination of D-InSAR, GPS data and the precise leveling data reveals that the short-term deformation rate is larger than long-term deformation rate, which implies that a destructive seismic event could occur in the eastern Tainan area. (c) 2007 Elsevier B.V. All rights reserved.
Effects of seismic anisotropy and geological characteristics on the kinematics of the neighboring Jiufengershan and Hungtsaiping landslides during Chi-Chi earthquake
(2009-03-10)
Dong, Jia-Jyun
;
Lee, Wang-Ru
;
Lin, Ming-Lang
;
Huang, An-Bin
;
Lee, Yen-Liang
The Chi-Chi earthquake (Mw=7.6) of September 21, 1999 triggered many landslides in central Taiwan. Two of these landslides, Hungtsaiping (HTP) and Jiufengershan (JFES) were situated as close as 2 km from each other but had significant differences in their kinematics. JFES landslide was a catastrophic rockslide-avalanche and the HTP landslide was relatively slow-moving. The authors conducted a study to explore the reasons for such differences. Factors such as the characteristics of strong ground motion, sliding direction of landslide, and friction angle of the sliding surface were considered in the study. An analysis of 12 strong-motion records collected in the study area showed that the distribution of horizontal pseudostatic coefficients, earthquake energy ratio and permanent sliding-block displacements (Newmark displacement) were anisotropic with their predominant direction mostly in the E/W-ESE/WNW trending. This direction is perpendicular to the axis of the main geological structures of the studied area. The computed Newmark displacement in the sliding direction of the JFES landslide is larger (44%) than that of the HTP landslide with sliding surface inclination of 21 degrees and friction angle of 28 degrees We can conclude that the seismic anisotropy and the corresponding sliding direction are important contributing factors to the kinematics of studied landslides. The back-calculated friction angle of the sliding surface that corresponds to a critical Newmark displacement for the JFES landslide is about 3.5 degrees higher than that of HTP landslide. The material (colluvium) on the sliding surface in HTP should be less velocity-dependent than that of the JFES landslide (rock) according to the back calculations. The importance of seismic anisotropy, sliding direction, and mechanical properties of sliding surface on the kinematics of deep-seated landslides is demonstrated. (c) 2007 Elsevier B.V. All rights reserved.
A straightforward alpha-selective aromatic glycosylation and its application for stereospecific synthesis of 4-methylumbelliferyl alpha-T-antigen
(2009-03-10)
Chang, Shih-Sheng
;
Lin, Chun-Cheng
;
Li, Yaw-Kuen
;
Mong, Kwok-Kong Tony
;
應用化學系
A practical and efficient alpha-selective aromatic glycosylation with simple per-O-acetyl glycopyranosyl trichloroacetimidates is reported. The method is particularly effective for L-fucosyl and 2-azido-2-deoxy-D-galatosaminyl imidates, with which exclusive alpha-selectivity was achieved. The synthetic utility of this method was demonstrated in the stereoselective synthesis of 4-methylumbelliferyl alpha-T-antigen. (C) 2008 Elsevier Ltd. All rights reserved.
Electron transport behavior of individual zinc oxide coated single-walled carbon nanotubes
(2009-03-11)
Lin, Chin-Ching
;
Chu, Bryan T. T.
;
Tobias, Gerard
;
Sahakalkan, Serhat
;
Roth, Siegmar
Uniform zinc oxide coated single-walled nanotubes (SWNTs) were fabricated by ultrasonic irradiation with acid-treated SWNTs, zinc acetate, and triethanolamine at low temperature in aqueous phase processing. The ZnO coating process did not decrease the dark current of the SWNTs, but a real decrease in the steady state negative photocurrent was observed after ZnO coating, suggesting a clear photosensitization effect. Transport measurements reveal that the negative photocurrent in s (semiconducting)-SWNTs@ZnO could be described by electron-hole compensation behavior attributed to the ZnO layer under ultraviolet excitation. This simple coating method for one-dimensional material can open up new possibilities for multifunctional nanodevices.
Four-probe electrical-transport measurements on single indium tin oxide nanowires between 1.5 and 300 K
(2009-03-11)
Chiu, Shao-Pin
;
Chung, Hui-Fang
;
Lin, Yong-Han
;
Kai, Ji-Jung
;
Chen, Fu-Rong
Single-crystalline indium tin oxide (ITO) nanowires (NWs) were grown by the standard thermal evaporation method. The as-grown NWs were typically 100-300 nm in diameter and a few mu m long. Four-probe submicron Ti/Au electrodes on individual NWs were fabricated by the electron-beam lithography technique. The resistivities of several single NWs have been measured from 300 down to 1.5 K. The results indicate that the as-grown ITO NWs are metallic, but disordered. The overall temperature behavior of resistivity can be described by the Bloch-Gruneisen law plus a low-temperature correction due to the scattering of electrons off dynamic point defects. This observation suggests the existence of numerous dynamic point defects in as-grown ITO NWs.
泛用型數位影像防振系統與方法
(2009-03-11)
林進燈
;
徐聖哲
;
梁勝富
本發明提供一種數位影像防振系統與方法,其係利用代表點比對所產生的共相關矩陣以x與y軸最小値投影和倒三角方法計算出局部移動向量可靠性指標,以產生乏條件(ill-conditioned)移動向量,並以背景考慮為基礎,利用對等估算的法則計算出整體移動向量,同時考慮影像平移時可使用的補償向量估算方法,使影像防振可適用於一般靜態或動態的拍攝。因此本發明提供一種數位影像防振系統與方法,係利用有效尋找較可靠之整體移動向量的方法,克服實際影像拍攝中所常面臨的異常情況,並改善傳統的補償方法所造成位置軌跡落後而影響補償效果的問題。
A New Scenario for Negative Functional Magnetic Resonance Imaging Signals: Endogenous Neurotransmission
(2009-03-11)
Shih, Yen-Yu I.
;
Chen, Chiao-Chi V.
;
Shyu, Bai-Chuang
;
Lin, Zi-Jun
;
Chiang, Yun-Chen
Functional magnetic resonance imaging (fMRI) has revolutionized investigations of brain functions. Increases in fMRI signals are usually correlated with neuronal activation, but diverse explanations have been proposed for negative fMRI responses, including decreases in neuronal activity, the vascular-steal effect, and large increases in oxygen consumption. These possible scenarios, although encompassing a wide range of potential neurovascular responses, cannot yet be used to interpret certain types of negative fMRI signals. Recent studies have found that intravenous injection of dopamine D(2) receptor (D2DR) agonist reduced the hemodynamic responses in the caudate-putamen (CPu); however, whether endogenous dopaminergic neurotransmission contributes to fMRI signals remains obscure. Since it has been suggested that the D2DR is involved in pain modulation, and the CPu shows equivocal fMRI signals during noxious stimulation, the present study established an animal model based on graded electrical stimulation to elicit different levels of nociception, and aimed to determine whether nociception-induced endogenous dopaminergic neurotransmission is sufficient to generate negative fMRI responses. Our results from cerebral blood volume (CBV)-weighted fMRI, Fos immunohistochemistry, and electro-physiological recording demonstrated a salient bilateral CBV decreases associated with heightened neuronal activity in the CPu induced by unilateral noxious electrical stimulation. In addition, preinjection of D2DR antagonist reduced the observed CBV decreases. Our findings reveal the role of the D2DR in regulating striatal vascular responses and suggest that endogenous neurotransmission-induced CBV decreases underlie negative fMRI signals. Hence, the influence of endogenous neurotransmission should be considered when interpreting fMRI data, especially in an area involved in strong vasoactive neurotransmission.
影像擷取裝置之校正系統及其方法
(2009-03-11)
王聖智
;
陳宜賢
本發明係揭露一種適用於影像擷取裝置之校正系統及其方法。此校正系統包含校正器具、特徵萃取單元及處理單元。校正器具具有複數個標示點,複數個標示點位於同一平面上,且形成一已知長度之線段。特徵萃取單元(feature extraction unit)根據影像擷取裝置所擷取之影像,以萃取出至少三個對應標示點之影像特徵點。處理單元根據至少三個影像特徵點及已知長度,計算出影像擷取裝置之對應此平面之傾斜角度及高度。其中,對應影像特徵點之標示點係形成一個已知角度之夾角(corner with known angle)、二個未知但相同角度之夾角(corner with unknown but equal angle)或二個未知但相同長度之線段(line segment with unknown but equal length)。藉此,可達到提高校正系統便利性之目的。
Preamble sequence detection and integral carrier frequency offset estimation method for OFDM/OFDMA wireless communication system
(2009-03-12)
Hung, Kun-Chien
;
Lin, David W.
In multi-cell OFDM/OFDMA wireless communication systems, any subscriber station (SS) or mobile station (MS) that intends to enter the system needs to establish time and frequency synchronization with the base station (BS) and obtain the identification code of the BS, where in frequency synchronization one usually needs to estimate the fractional carrier frequency offset (CFO) and the integral CFO. (“Fractional” and “integral” refer to, respectively, the fractional and the integral parts of the ratio of the CFO to subcarrier spacing.) The present invention assumes that the SS or MS first does timing and fractional CFO synchronization and then conducts integral CFO estimation and BS identity detection. The present invention considers integral CFO estimation and BS identity detection jointly, i.e., it proposes solutions that address these topics jointly. The present invention formulates the problem as a signal detection problem in multi-channel interference and obtains the theoretically optimal solution first, and then derives simplified, approximately optimal solutions, in which the present invention employs frequency-domain filtering to calculate the required correlation values which can drastically reduce the high computational complexity of the original theoretically optimal solution but results in little impact on precision. In addition, the present invention proposes several further simplified algorithms, some of which can even eliminate the use of multipliers. The above proposition of frequency-domain filtering has high extensibility in application to related signal sequence detection problems.
制御装置および方法
(2009-03-12)
李嘉晃
;
林建良
【課題】携帯機器における三次元空間制御を行うことができる制御装置を提供する。【解決手段】制御装置は、画像取得モジュールと、分離モジュールと、測位モジュールと、構築モジュールと、処理モジュールとを備えている。画像取得モジュールは、動画像を記録するとともに、正の整数であるＮ個の画像フレームを生成する。分離モジュールは、ポインティングデバイスの特徴に基づいて、ポインティングデバイスが対応するポインティングデバイス画像を、各々の画像フレームからそれぞれ抽出する。そして測位モジュールは、各々の画像フレームにおけるポインティングデバイス画像の特定点をそれぞれ計算して、第１の特定点情報組を生成する。また、構築モジュールは、所定条件および第１の特定点情報組に基づいて、移動軌跡を生成する。処理モジュールは、移動軌跡を分析するとともに、制御信号を生成して、制御信号に基づいて物体を制御する。【選択図】図１
Power Controlling Apparatus Applied to Biochip and Operating Method Thereof
(2009-03-12)
Wu, Chung Yu
;
Lin, Po Kang
;
Lin, Li Ju
;
Yang, Wen Chia
;
Wan, Chen
The invention discloses a power controlling apparatus for a biochip including M regions. Each region includes a plurality of cells respectively. The power controlling apparatus includes a pulse generating module, a combinational circuit, and M controlling modules. The pulse generating module generates a pulse. The combinational circuit receives the pulse and generates M controlling signals. Each controlling signal has a predetermined phase which is different from the phase of the other controlling signal. The M controlling modules are electrically connected to the combinational circuit. Each of the M controlling signals corresponds to and activates one of the M controlling modules to selectively power on one corresponding region of the M regions. The cells in the corresponding region which is powered have an action potential refractory time that is longer than the power-on interval of the corresponding region.
Using multimode Fabry-Perot laser without external-injection for wavelength conversion
(2009-03-12)
Yeh, C. H.
;
Chow, C. W.
;
Wang, C. H.
;
Shih, F. Y.
;
Wu, Y. F.
Proposed and experimentally investigated is an all-optical wavelength converter using a multi-quantum-well multi-longitudinal-mode Fabry-Perot laser diode without any external probe beam or external built-in cavity. The input wavelength can be converted at 2.5 Gbit/s by the converter and the power penalty of 3.5 dB is observed at a bit error rate of 10(-9). The proposed converter apparatus is simple and cost-effective for wavelength division multiplexing network applications.
NONVOLATILE MEMORY DEVICE WITH NANOWIRE CHANNEL AND METHOD FOR FABRICATING THE SAME
(2009-03-12)
LIN, Horng-Chih
;
Su, Chun-Jung
;
Hsu, Hsin-Hwei
A nonvolatile memory device with nanowire channel and a method for fabricating the same are proposed, in which side etching is used to shrink side walls of a side-gate to form a nanowire pattern, thereby fabricating a nanowire channel on the dielectric of the side walls of the side-gate. A nonvolatile memory device with nanowire channel and dual-gate control can thus be achieved. This nonvolatile memory device can enhance data writing and erasing efficiency, and also has the capability of low voltage operation. Moreover, through a process of low cost and easy steps, highly reproducible and mass producible fabrication of nanowire devices can be accomplished.
Dynamics of Particle-Hole Pair Creation in Graphene
(2009-03-13)
Lewkowicz, M.
;
Rosenstein, B.
;
電子物理學系
;
Department of Electrophysics
The process of coherent creation of particle-hole excitations by an electric field in graphene is quantitatively described. We calculate the evolution of the current density, number of pairs, and energy after switching on the electric field. In particular, it leads to a dynamical visualization of universal finite resistivity without dissipation in pure graphene. We show that the dc conductivity of pure graphene is pi/2e(2)/h rather than the often cited value of 4/pi e(2)/h. This value coincides with the ac conductivity calculated and measured recently at optical frequencies. The effect of temperature and random chemical potential (charge puddles) are considered and explain the recent experiment on suspended graphene. A possibility of Bloch oscillations is discussed within the tight binding model.
《.hack//G.U. TRILOGY》
(2009-03-15)
曾韋澐
;
Department of Communication and Technology
;
傳播與科技學系
0
又見棄養潮　滿街可魯跑
(2009-03-15)
趙祿平
;
Department of Communication and Technology
;
傳播與科技學系
敘述動物電影與棄養潮