Browsing by Issue Date, starting with "2009-10-29"

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Vertical Transmission Structure
(2009-10-29)
Chang, Edward Yi
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Wu, Wei-Cheng
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Hwang, Ruey-Bing
;
Hsu, Li-Han
A vertical transmission structure for high frequency transmission lines includes a conductive axial core and a conductive structure surrounding the conductive axial core. The vertical transmission structure is applied to a high-frequency flip chip package for reducing the possibility of underfill from coming in contact with the conductive axial core.
Automatized Parametrization of SCC-DFTB Repulsive Potentials: Application to Hydrocarbons
(2009-10-29)
Gaus, Michael
;
Chou, Chien-Pin
;
Witek, Henryk
;
Elstner, Marcus
;
應用化學系
In this work, we derive and test a new automatized strategy to construct repulsive potentials for the self-consistent charge density functional tight-binding (SCC-DFTB) method. This approach allows one to explore the parameter space in a systematic fashion in order to find optimal solutions. We find that due to the limited flexibility of the SCC-DFTB electronic part, not all properties can be optimized simultaneously. For example, the optimization of heats of formation is in conflict with the optimization of vibrational frequencies. Therefore, a special parametrization, for vibrational frequencies is derived. It is shown that the performance of SCC-DFTB can be significantly improved using a more elaborate fitting strategy. A new fit for C and H is presented, which results in an average error of 2.6 kcal/mol for heats of formations for a large set of hydrocarbons, indicating that the performance of SCC-DFTB can be systematically improved also for other elements.
一部の光照射野において二次制御が可能なバックライトモジュールを形成する光学装置
(2009-10-29)
田仲豪
;
陸彦行
;
鄭裕國
;
呂柏毅
【課題】一部の光照射野において二次制御が可能なバックライトモジュールを形成する光学装置である。【解決手段】本発明は一部の光照射野において二次制御が可能なバックライトモジュールに関する光学装置である。まず、導光板は複数の導光エレメントを有し、当該導光エレメントには中央の穴と、導光板光入射面と、一導光板光出射面と、導光板底面とを有する点光源を備え、当該点光源は当該導光エレメントの中央の穴に位置し、導光板底面には複数のマイクロ構造体を備えている。集光膜シートは、複数の照射膜エレメントを有し、当該照射膜エレメント上の集光膜光出射面には複数のマイクロ構造体を備え、当該マイクロ構造体により、照射膜エレメントと導光エレメントを接合することで、一部の光照射野において二次制御が可能なバックライトモジュール装置を形成する。【選択図】図３－Ｂ
Quantum Chemical Prediction of Pathways; and Rate Constants for Reactions of CO and CO2 with Vacancy Defects on Graphite (0001) Surfaces
(2009-10-29)
Xu, S. C.
;
Irle, S.
;
Musaev, D. G.
;
Lin, M. C.
;
應用化學系分子科學碩博班
We present reaction pathways for adsorption of CO and CO2 molecules in the vicinity of monovacancy defects on graphite (0001) based on B3LYP and dispersion-augmented density-functional tight-binding (DFTB-D) studies of the potential energy surfaces (PES) of these reactions. To model the graphite (0001) monovacancy defects, finite-size molecular model systems up to the size of dicircumcoronene (C95H24) were employed. We find that the CO molecule reacts readily with the monovacancy defects and partially "heals" the carbon hexagon network leading to the formation of a stable epoxide, whereas CO2 oxidizes the defect via a dissociative adsorption pathway following CO elimination. We predict reaction rate constants in the temperature range between 300 and 3000 K using Rice-Ramsperger-Kassel-Marcus theory. Quantum chemical molecular dynamics simulations at 3000 K based on on-the-fly DFTB-D energies and gradients-support the results of our PES studies.
Quantum Chemical Prediction of Pathways; and Rate Constants for Reactions of CO and CO(2) with Vacancy Defects on Graphite (0001) Surfaces
(2009-10-29)
Xu, S. C.
;
Irle, S.
;
Musaev, D. G.
;
Lin, M. C.
;
應用化學系分子科學碩博班
We present reaction pathways for adsorption of CO and CO(2) molecules in the vicinity of monovacancy defects on graphite (0001) based on B3LYP and dispersion-augmented density-functional tight-binding (DFTB-D) studies of the potential energy surfaces (PES) of these reactions. To model the graphite (0001) monovacancy defects, finite-size molecular model systems up to the size of dicircumcoronene (C(95)H(24)) were employed. We find that the CO molecule reacts readily with the monovacancy defects and partially "heals" the carbon hexagon network leading to the formation of a stable epoxide, whereas CO(2) oxidizes the defect via a dissociative adsorption pathway following CO elimination. We predict reaction rate constants in the temperature range between 300 and 3000 K using Rice-Ramsperger-Kassel-Marcus theory. Quantum chemical molecular dynamics simulations at 3000 K based on on-the-fly DFTB-D energies and gradients-support the results of our PES studies.
統合型画像監視システムおよびその画像ビデオ融合方法
(2009-10-29)
陳永昇
;
鄭詠成
;
林開印
【課題】１つの領域の複数のカメラで取得したビデオを1つの大きな範囲の画像に統合し、1つの領域を監視する統合型画像監視システムを提供する。【解決手段】前記システムは、第１撮影装置と、第２撮影装置と、第３撮影装置と、画像処理装置と、表示装置とを主に含む。画像処理装置は、第１定義素子と、第１合成素子と、第２定義素子と、調整素子と、転換素子と、第３定義素子と、第２合成素子とをさらに含む。【選択図】図２
光検出装置構造
(2009-10-29)
孟心飛
;
洪勝富
;
趙宇強
【課題】光検出装置構造を提供する。【解決手段】光検出装置構造であって、基材と、垂直駆動有機発光トランジスタと、光検出ユニットとを含み、垂直駆動有機発光トランジスタは基材の第１位置に設置され、光検出ユニットは基材の第２位置に設置され、且つ設計上の需要に応じて第１位置と第２位置に所定の距離を隔てることができる。本光検出装置構造は、垂直駆動有機発光トランジスタによって光線を物体に発射し、光検出ユニットが物体により反射された反射光線を受信し、受信した反射光線を分析し、光検出装置構造と物体との間の距離を計算することに用いることができ、物体の形状または組成成分を判読することに用いることができる。【選択図】図１
TRANSIENT DETECTION CIRCUIT
(2009-10-29)
Ker, Ming-Dou
;
Yen, Cheng-Cheng
;
Liao, Chi-Sheng
;
Chen, Tung-Yang
A transient detection circuit coupled between a first power line and a second power line and including a first control unit, a setting unit, and a voltage regulation unit. The first control unit generates a first control signal. The first control signal is at a first level when an electrostatic discharge (ESD) event occurs. The first control signal is at a second level when the ESD event does not occur. The setting unit sets a first node. The first node is set at the second level when the first control signal is at the first level. The voltage regulation unit regulates the first node. The voltage regulation unit regulates the level of the first node at the second level when the first control signal is at the second level.
Thickness Dependent Phase Behavior of Antiferroelectric Liquid Crystal Films
(2009-10-30)
Pan, LiDong
;
Wang, Shun
;
Hsu, C. S.
;
Huang, C. C.
;
應用化學系
Free standing films of a liquid crystal compound with simple surface enhanced order were studied. The resultant phase diagram demonstrates that (1) the short helical pitch smectic-C-alpha* phase disappears below a film thickness of 10 layers, and (2) the temperature window of a distorted 4 layer smectic-C-FI2* phase increases dramatically upon decreasing film thickness. The experimental findings were attributed to the reduced dimensionality and enhanced surface effects in thin films. The results of the smectic-C-alpha* phase are consistent with what have been reported for helically ordered magnetic thin films, with a noticeable difference due to the opposite effect of the surface on ordering in the two systems.
Chaos synchronization and chaotization of complex chaotic systems in series form by optimal control
(2009-10-30)
Ge, Zheng-Ming
;
Yang, Cheng-Hsiung
;
機械工程學系
;
Department of Mechanical Engineering
By the method of quadratic optimum control, a quadratic optimal regulator is used for synchronizing two complex chaotic systems in series form. By this method the least error with less control energy is achieved, and the optimization on both energy and error is realized synthetically. The simulation results of two Quantum-CNN chaos systems in series form prove the effectiveness of this method. Finally, chaotization of the system is given by optimal control. (C) 2009 Elsevier Ltd. All rights reserved.
(PS)(2)-v2: template-based protein structure prediction server
(2009-10-31)
Chen, Chih-Chieh
;
Hwang, Jenn-Kang
;
Yang, Jinn-Moon
;
生物科技學系
;
生物資訊及系統生物研究所
Background: Template selection and target-template alignment are critical steps for template-based modeling (TBM) methods. To identify the template for the twilight zone of 15 similar to 25% sequence similarity between targets and templates is still difficulty for template-based protein structure prediction. This study presents the (PS)(2)-v2 server, based on our original server with numerous enhancements and modifications, to improve reliability and applicability. Results: To detect homologous proteins with remote similarity, the (PS)(2)-v2 server utilizes the S2A2 matrix, which is a 60 x 60 substitution matrix using the secondary structure propensities of 20 amino acids, and the position-specific sequence profile (PSSM) generated by PSI-BLAST. In addition, our server uses multiple templates and multiple models to build and assess models. Our method was evaluated on the Lindahl benchmark for fold recognition and ProSup benchmark for sequence alignment. Evaluation results indicated that our method outperforms sequence-profile approaches, and had comparable performance to that of structure-based methods on these benchmarks. Finally, we tested our method using the 154 TBM targets of the CASP8 (Critical Assessment of Techniques for Protein Structure Prediction) dataset. Experimental results show that (PS)(2)-v2 is ranked 6(th) among 72 severs and is faster than the top-rank five serves, which utilize ab initio methods. Conclusion: Experimental results demonstrate that (PS)(2)-v2 with the S2A2 matrix is useful for template selections and target-template alignments by blending the amino acid and structural propensities. The multiple-template and multiple-model strategies are able to significantly improve the accuracies for target-template alignments in the twilight zone. We believe that this server is useful in structure prediction and modeling, especially in detecting homologous templates with sequence similarity in the twilight zone.
Effects of a Modulated Electric Field on the Optical Absorption Spectra in a Single-Layer Graphene
(2009-11-01)
Chiu, Yu-Huang
;
Ho, Jon-Hsu
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Ho, Yen-Hung
;
Chuu, Der-San
;
Lin, Ming-Fa
The optical absorption spectra of a graphene monolayer in the presence of a modulated electric field are investigated by the gradient approximation with tight-binding model. Such a field could strongly affect the low-energy electronic and optical properties. The low-energy bands exhibit two kinds of band-edge states (mu and nu), which lead to many prominent asymmetric peaks in the density of states (DOS). The finite DOS at omega = 0 implies that a single layer graphene in the presence of modulated electric fields would become a semimetallic one. The low-frequency optical absorption spectra display rich peaks and they vanish at omega = 0. Such absorption peaks mainly result from the two kinds of band-edge states and could be divided into two groups. However, they could not be ascribed to an obvious selection rule. It is worth noting that the optical absorption spectra could show anisotropic features in different modulated directions. The predicted results could be verified by the experimental measurements.
Process and properties of the carbon nanotube assisted LiCoO(2) thin-film battery electrode by pulsed laser deposition
(2009-11-01)
Lo, An-Ya
;
Sun, Chuan-Shu
;
Tseng, Wen-Shou
;
Kuo, Cheng-Tzu
;
材料科學與工程學系
In this study, a pulsed laser deposition process was developed to deposit a carbon nanotube (CNT) assisted LiCoO(2) electrode to improve its power density. The electrodes were deposited on Pt-coated Si substrates with Ar and O(2) as sputtering gases and LiCoO(2)+C as the target. The results indicate that the working pressure is the most important parameter to control the composition of the electrode. Therefore, electrodes with a three-layer structure (i.e., LiCoO(2)-rich/CNT-rich/LiCoO(2)-rich) were fabricated by a three-step deposition process by varying the pressures from 13 to 1.3x10(4) Pa and then 13 Pa again, and it was found that the charge/discharge capacity became approximately 1.5 times greater than that in the corresponding electrode without a CNT-rich layer. The results also indicate that a higher substrate temperature is favorable for improving the crystallinity of the electrode to approach LiCoO(2) crystals.
Fault-Tolerant Hamiltonian Connectivity and Fault-Tolerant Hamiltonicity of the Fully Connected Cubic Networks
(2009-11-01)
Ho, Tung-Yang
;
Lin, Cheng-Kuan
;
資訊工程學系
;
Department of Computer Science
Many papers on the fully connected cubic networks have been published for the past several years due to its favorite properties. In this paper, we consider the fault-tolerant hamiltonian connectivity and fault-tolerant hamiltonicity of the fully connected cubic network. We use FCCN(n) to denote the fully connected cubic network of level n. Let G = (V, E) be a graph. The fault-tolerant hamiltonian connectivity H(f)(k) (G) is defined to be the maximum integer l such that G - F remains hamiltonian connected for every F subset of V(G) boolean OR E(G) with vertical bar F vertical bar <= l. The fault-tolerant hamiltonicitly H(f)(G) is defined to be the maximum integer l such that G - F remains hamiltonian for every F subset of V(G) boolean OR E(G) with vertical bar F vertical bar <= l. We prove that H(f)(k) (FCCN(n)) = 0 and H(f)(FCCN(n)) = 1 if n >= 2.
Predicting protein subnuclear localization using GO-amino-acid composition features
(2009-11-01)
Huang, Wen-Lin
;
Tung, Chun-Wei
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Huang, Hui-Ling
;
Ho, Shinn-Ying
;
生物科技學系
The nucleus guides life processes of cells. Many of the nuclear proteins participating in the life processes tend to concentrate on subnuclear compartments. The subnuclear localization of nuclear proteins is hence important for deeply understanding the construction and functions of the nucleus. Recently, Gene Ontology (GO) annotation has been used for prediction of subnuclear localization. However, the effective use of GO terms in solving sequence-based prediction problems remains challenging, especially when query protein sequences have no accession number or annotated GO term. This study obtains homologies of query proteins with known accession numbers using BLAST to retrieve GO terms for sequence-based subnuclear localization prediction. A prediction method PGAC, which involves mining informative GO terms associated with amino acid composition features, is proposed to design a support vector machine-based classifier. PGAC yields 55 informative GO terms with training and test accuracies of 85.7% and 76.3%, respectively, using a data set SNL-35 (561 proteins in 9 localizations) with 35% sequence identity. Upon comparison with Nuc-PLoc, which combines amphiphilic pseudo amino acid composition of a protein with its position-specific scoring matrix, PGAC using the data set SNL_80 yields a leave-one-out cross-validation accuracy of 81.1%, which is better than that of Nuc-PLoc, 67.4%. Experimental results show that the set of informative GO terms are effective features for protein subnuclear localization. The prediction server based on PGAC has been implemented at http://iclab.life.nctu.edu.tw/prolocgac. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
低密度合金材料及其製法
(2009-11-01)
劉增豐
;
李堅瑋
一種低密度之合金材料及其製法，其主要組成以重量百分比計，此合金材料含有重量百分比大於等於15小於等於22.5的錳，大於等於7.2小於等於9.0的鋁，大於等於5.1小於等於7.8的鉻，大於等於0.6小於等於1.2的碳及其餘比例為鐵所組合而成。上述揭示之合金成分之合金材料製作高爾夫球桿頭時，不需任何鍛造及軋延等熱作和冷作塑性加工，即可使高爾夫球桿頭具有極佳的延伸性、強度、吸震性及抗蝕性等特性，大幅降低目前的生產成本。
Protein purification involving a unique auto-cleavage feature of a repeated EAAAK peptide
(2009-11-01)
Wu, Yue-Jin
;
Fan, Chia-Ying
;
Li, Yaw-Kuen
;
交大名義發表
;
National Chiao Tung University
A network-based approach for increasing discrimination in data envelopment analysis
(2009-11-01)
Liu, J. S.
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Lu, W-M
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Yang, C.
;
Chuang, M.
;
交大名義發表
Data envelopment analysis (DEA) is known to produce more than one efficient decision-making unit (DMU). This paper proposes a network-based approach for further increasing discrimination among these efficient DMUs. The approach treats the system under study as a directed and weighted network in which nodes represent DMUs and the direction and strength of the links represent the relative relationship among DMUs. In constructing the network, the observed node is set to point to its referent DMUs as suggested by DEA. The corresponding lambda values for these referent DMUs are taken as the strength of the network link. The network is weaved by not only the full input/output model, but also by models of all possible input/output combinations. Incorporating these models into the system basically introduces the merits of each DMU under various situations into the system and thus provides the key information for further discrimination. Once the network is constructed, the centrality concept commonly used in social network analysis-specifically, eigenvector centrality-is employed to rank the efficient DMUs. The network-based approach tends to rank high the DMUs that are not specialized and have balanced strengths.
撫慰人心的溫暖
(2009-11-01)
吳雨璇
;
Department of Communication and Technology
;
傳播與科技學系
大二那年的暑假跟表姊在阿里山第一次看到的日出，到現在還歷歷在目，還清楚記得當時那個撼動我心的日出。明明是暑假，太陽出來前的阿里山上卻冷的像十二月的寒冬，坐上小火車一路從沼平搖到祝山，在沒有路燈的山路上往前跑，直到擠上山頭，擠到人群的最前面，和擁擠的人潮一起等待難得的朝陽。時間一分一秒的過去，興奮期待的心情在太陽升起的一瞬間爆發，我們心裡再也容不下別的事情，有的只是暖暖的感動，當下彷彿再也沒有什麼事難得倒我，得到太陽無窮無盡的力量。
Confinement-enhanced dots-in-a-well QDIPs with operating temperature over 200 K
(2009-11-01)
Ling, H. S.
;
Wang, S. Y.
;
Lee, C. P.
;
Lo, M. C.
;
電子工程學系及電子研究所
LWIR InAs/Al(0.3)Ga(0.7)As/In(0.15)Ga(0.85)As confinement-enhanced DWELL (CE-DWELL) QDIPs with operation temperatures higher than 200 K are reported. A thin Al(0.3)Ga(0.7)As barrier layer was inserted above the InAs QDs to improve the confinement of QD states in the In(0.15)Ga(0.85)As DWELL structure and the device performance. The better confinement of the electronic states increases the oscillator strength of the infrared absorption. The higher excited state energy also improves the escape probability of the photoelectrons. Compared with the conventional DWELL QDIPs, the quantum efficiency increases for more than 20 times and the detectivity is an order of magnitude higher at 77 K. With better device parameters of CE-DWELL, it is possible to achieve high quantum efficiency, high operating temperature and long wavelength detection at the same time. (C) 2009 Elsevier B.V. All rights reserved.