Browsing by Issue Date, starting with "2006-08-31"

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Tunable optical group delay in quantum dot vertical-cavity surface-emitting laser at 10 GHz
(2006-08-31)
Peng, P. C.
;
Lin, C. T.
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Kuo, H. C.
;
Lin, G.
;
Tsai, W. K.
This investigation experimentally demonstrates tunable optical group delay in a 1.3 mu m quantum dot vertical-cavity surface-emitting laser (QD VCSEL). The QD VCSEL is fabricated on a GaAs substrate. Tunable delays are achieved by varying the bias currents, and the maximum delay of 42 ps at 10 GHz has been demonstrated at room temperature.
閱讀精神病
(國立陽明交通大學出版社, 2006-09-01)
沈志中
佛洛伊德自始便企求能夠將當時定義未明的精神病，特別是妄想症編納入其系統化的知識之內。直到佛洛伊德著作晚期，仍然可見精神分析跨入精神病境地的想望。但精神病這個難題始終不被自詡為科學的精神分析知識所馴服。若精神分析為研究意識之外者－無意識－的學說，則精神病這個不被知識馴化的課題是否構成吾人意識之外的之外？一種無意識的無意識？精神病之於精神分析，正有如歇斯底里之於十九世紀末的精神醫學。歇斯底里研究顯示出精神分析之特殊性；但唯有精神病研究才能讓我們詰問精神分析本質性的局限與內在跨越界線的知識慾望。處於類似的處境，拉岡(J. Lacan)不也是透過妄想症研究而從傳統精神醫學踏入精神分析？因此，毫無疑問地，要探討精神分析學之知識論本質，不得不經由精神病與精神分析關係的重新反省。
死亡驅力，或是解離之力：克莉絲蒂娃文化理論的政治與倫理
(國立陽明交通大學出版社, 2006-09-01)
劉紀蕙
本文討論克莉絲蒂娃如何透過佛洛伊德的語言理論，解決了西方思想主客對立的二元辯證，而展開了以精神分析出發的政治觀與倫理觀。1980、90年代英美女性主義者批評克莉絲蒂娃追隨佛洛伊德，而過於陽具中心主義。但是，仔細閱讀克莉絲蒂娃早期到晚期的作品，我們不難發現她所持續進行的，正是對於任何單一邏輯封閉系統的解構。本文以三個階段展開：首先，從歐陸當代哲學重探政治性概念的脈絡出發，檢視克莉絲蒂娃的政治性立場。其次，進入佛洛伊德語言理論所包含的力的概念、真實與符號化的辯證等問題，討論克莉絲蒂娃如何透過佛洛伊德的理論，發展符號驅力與象徵鍊結的連續體概念，如何指出文化現象，包括理性知識與真理陳述，都有其內在的分裂、壓抑、否認、拒斥，以及克莉絲蒂娃如何利用佛洛伊德的死亡驅力概念，指出挑戰社會共識的壓迫性與專斷，揭露理性知識與真理體系背後隱藏的排他性邏輯，需要有解離之力。這個解離之力，就是佛洛伊德所說的「知性化」過程，也是克莉絲蒂娃所說的思想的「反叛／迴轉」。反叛，不是對立面的僵持或是破壞，而是心靈空間不斷打開、離開、重組、轉向。第三個階段進入克莉絲蒂娃所提出的政治性空間，或是她所謂的「象徵性國家」之概念。透過解離之力，一個文化才能夠提供具有質疑、反叛、迴轉、更新、聆聽與創造的政治性空間。對克莉絲蒂娃而言，國家不是以語言、血緣或是土地而連結的民族國家，而是以象徵契約之概念作為基礎，在自由與平等的個人之間，建立一種過渡式的契約與文化的「國家」。本文以倫理的思考作為結語。持續思索與揭露語言過程中被隱藏的因果與倫理的沈默邏輯，朝向不再被質疑的絕對標準背後所隱藏的暴力開始發問，便是倫理的起點。
Homologous response regulators KvgA, KvbA and KvhR regulate the synthesis of capsular polysaccharide in Klebsiella pneumoniae CG43 in a coordinated manner
(2006-09-01)
Lin, Ching-Ting
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Huang, Teng-Yi
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Liang, Wan-Chun
;
Peng, Hwei-Ling
;
生物科技學系
On the basis of phenotypic analysis, the Klebsiella pneumoniae CG43 derived mutants with deletions of the gene encoding respectively the response regulators KvgA, KvhA, and KvhR were classified into two groups. Group I bacteria carrying either kvgA(-) or kvhR(-) exhibited less mucoidy, lower level of capsular polysaccharide (CPS) synthesis and higher LD50 than the parental strain. No apparent change of the group II, including kvhA(-) and hvhA(-)kvhR(-) mutants, was observed. However, the mucoidy of kvhA(-)kvhR(-) mutant was found to be diminished after introducing into a kvhA(-) expressing plasmid. Via promoter-lacZ fusion analysis, kvhA deletion was found to reduce kvhR expression. A regulatory role of KvhA for the expression of kvhR was supported further by EMSA showing a specific binding of KvhA to the putative promoter of kvhR. The promoter activity measurement and EMSA also revealed that KvgA acted as an autoregulator and an activator for the expression of kvhAS and kvhR. In addition, deletion of kvgA suppressed slightly the promoter activity of the cps-orf16-17, and the expression of all three cps transcripts orf1-2, orf3-15, and orf16-17 were reduced in the kvhR(-) mutant. These suggest that the three homologous response regulators interact to control, in coordination, the bacterial cps expression.
具3D聲場效果之陣列式助聽器
(2006-09-01)
白明憲
;
林振邦
本發明係一種具3D聲場效果之陣列式助聽器，其係以陣列式麥克風接收至少一聲源訊號並輸出至數位訊號處理器，數位訊號處理器依據聲源訊號進行程序建立聲束及掃描該聲源訊號之方向，陣列訊號處理方法包含超指向性法(super directive method)及延遲加成法(delay and sum method)，利用陣列訊號處理方法進行方向估計及聲束形成，係利用超指向性法提高聲源指向性與訊號對聲源之雜訊比以得到最大聲源訊號，利用延遲加成法進行方向估計以找出聲源方向，搭配頻率補償系統及頭部轉移函數以產生3D聲場效果。
Secure authentication protocols resistant to guessing attacks
(2006-09-01)
Luo, Jia-Ning
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Shieh, Shiuhpyng
;
Shen, Ji-Chiang
;
資訊工程學系
;
Department of Computer Science
Users are normally authenticated via their passwords in computer systems. Since people tend to choose passwords that can be easily remembered, the systems are under the threat of guessing attacks. Many authentication and key distribution protocols have been proposed to protect user passwords from guessing attacks. However, these protocols either are limited to some specific environments or incur high computation and communication costs. In the paper, we first specify five common forms of guessing attacks, which are used to determine whether a protocol is vulnerable to those attacks. Based on these common forms, some guidelines are provided for developing secure protocols that can be used in both symmetric and asymmetric cryptosystems to defend against guessing attacks. Finally, we enhance the well-known authentication system Kerberos and propose two authentication and key distribution protocols, which are both resistant to guessing attacks.
EDFA-free all-optical 2R regeneration using a compact self-seeded Fabry-Perot laser diode (vol 18, pg 1112, 2006)
(2006-09-01)
Chien, Hung-Chang
;
Lee, Chien-Chung
;
Lin, Chun-Ting
;
Chi, Sien
;
光電工程學系
由金氧半場效電晶體臨界電壓與熱效應電壓所組成之參考電壓電路
(2006-09-01)
洪崇智
本發明係揭露一種由金氧半場效電晶體臨界電壓與熱效應電壓所組成之參考電壓電路。本發明以現有的能隙電壓架構為基礎，並使用了工作於弱反轉層的場效電晶體代替傳統的雙載子電晶體，以產生與溫度係數正相關之電流，再由金氧半場效電晶體臨界電壓產生另一與溫度係數負相關之電流，結合以上兩個電流而產生一不隨溫度變化而改變之穩定參考電流，再將此電流通過一電阻，以產生一與溫度係數完全不相關之參考電壓。
Purification, crystallization and preliminary X-ray crystallographic analysis of chitinase from Bacillus cereus NCTU2
(2006-09-01)
Kuo, Chueh-Yuan
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Wu, Yue-Jin
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Hsieh, Yin-Cheng
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Guan, Hong-Hsiang
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Tsai, Huei-Ju
Chitinases (EC 3.2.1.14) are found in a broad range of organisms, including bacteria, fungi and higher plants, and play different roles depending on their origin. A chitinase from Bacillus cereus NCTU2 (ChiNCTU2) capable of hydrolyzing chitin as a carbon and nitrogen nutrient has been identified as a member of the family 18 glycoside hydrolases. ChiNCTU2 of molecular weight 36 kDa has been crystallized using the hanging-drop vapour-diffusion method. According to the diffraction of chitinase crystals at 1.10 angstrom resolution, the crystal belongs to space group P2(1), with unit-cell parameters a = 50.79, b = 48.79, c = 66.87 angstrom, beta = 99.31 degrees. Preliminary analysis indicates there is one chitinase molecule in the asymmetric unit, with a solvent content of 43.4%.
A max-min fairness congestion control for layered streaming of scalable video
(2006-09-01)
Hsiao, Hsu-Feng
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Hwang, Jenq-Neng
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資訊工程學系
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Department of Computer Science
In a best-effort networking environment, efficient and fair congestion control is highly desired for every traffic flow to share the bandwidth appropriately. This paper proposes a congestion control algorithm for user datagram protocol rate-based layered streaming of scalable video, e.g., 3-D wavelet based scalable video streaming, which provides a variety of video bit rates. This proposed congestion control mechanism, as an extension of explicit control protocol that is a newly proposed congestion control. protocol believed to be superior to transport control protocol, accommodates both window-based and rate-based flows to the heterogeneous network environment which can include wired and wireless channels. This paper further introduces the notion of reserved packet length so that the traffic of layered video can better share the bandwidth of a network by taking account of the max-min fairness with other traffic.
Epitaxial layer of MgO (001) grown on Si(001)wafer by e-beam evaporation
(2006-09-01)
Lee, M. D.
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Lo, C. K.
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Peng, T. Y.
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Yau, K. L.
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Chen, S. Y.
MgO(0 0 1) has been growing successfully on Fe/Pd/Cu/Si(1 0 0) by e-beam evaporation as examined by X-ray diffraction and high resolution transmission microscope. We present the magnetic peculiarity of crystal structure Fe(0 0 1)/Pd(0 0 1)/Cu(0 0 1) on Si(0 0 1) substrate. The magnetic properties of the sample were measured by magneto-optical Kerr effect which shows an in-plane magnetocrystalline anisotropy. (C) 2006 Elsevier B. V. All rights reserved.
NCTU6 wins Connect6 tournament
(2006-09-01)
Wu, I-Chen
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Yen, Shi-Jim
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資訊工程學系
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Department of Computer Science
Antiresonant reflecting optical waveguides polarization beam splitters
(2006-09-01)
Huang, Yang-Tung
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Jang, Chiou-Hung
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Hsu, Shih-Hsin
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Deng, Jau-Jan
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電子工程學系及電子研究所
Three different configurations of polarization beam splitters based on antiresonant reflecting optical waveguide (ARROW) structures are proposed. The polarization splittings are attained by utilizing various characteristics of basic ARROW and/or ARROW-B. In comparison with conventional waveguides, ARROW structures utilizing antiresonant reflection as the guiding mechanism can have large core sizes compatible with single-mode fibers and, thus, provide better coupling. Design principles and characteristics of these ARROW polarization beam splitters are discussed in detail, and the simulation results show that all these devices have good polarization discrimination with crosstalk < -20 dB.
Threshold-voltage-compensation methods for AMOLED pixel and analog buffer circuits
(2006-09-01)
Chen, Bo-Ting
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Tai, Ya-Hsiang
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Wei, Ying-Jyun
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Tsai, Chun-Chien
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Huang, Chun-Yao
New pixel-circuit designs for active-matrix organic light-emitting diodes (AMOLEDs) and a new analog buffer circuit for the integrated data-driver circuit of active-matrix liquid-crystal displays (AMLCDs) and AMOLEDs, based on low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs), were proposed and verified by SPICE simulation and measured results. Threshold-voltage-compensation pixel circuits consisting of LTPS-TFTs, an additional control signal line, and a storage capacitor were used to enhance display-image uniformity. A diode-connected concept is used to calibrate the threshold-voltage variation of the driving TFT in an AMOLED pixel circuit. An active load is added and a calibration operation is applied to study the influences on the analog buffer circuit. The proposed circuits are shown to be capable of minimizing the variation from the device characteristics through the simulation and measured results.
Effect of photonic crystal band gap on rotation of hollow oval Te rods in triangular lattice
(2006-09-01)
Chang, Kuo-Pin
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Yang, Su-Lin
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電子物理學系
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Department of Electrophysics
The band structures and field patterns of two-dimensional (2D) triangular photonic crystals with hollow tellurium (Te) rods are calculated using the plane-wave method. Inner-rod and whole-rod rotations are considered to investigate how the rotational and structural symmetries affect E- and H-polarization modes. It is indicated that the H-polarization modes are strongly affected by the shape and interaction between the fields of the rods. In addition, the effect of rotational symmetry on H-polarization modes must be considered when whole rods are rotated. The E-polarization modes for both types of rotations are strongly related to the shape of the rods. Moreover, H-polarization modes determine the absolute photonic band gap (PBG) width when whole rods are rotated, while E-polarization modes determine the absolute PBG width when inner rods are rotated.
Overview and design of mixed-voltage I/O buffers, with low-voltage thin-oxide CMOS transistors
(2006-09-01)
Ker, Ming-Dou
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Chen, Shih-Lun
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Tsai, Chia-Sheng
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電機學院
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College of Electrical and Computer Engineering
Overview on the prior designs of the mixed-voltage I/O buffers is provided in this work. A new 2.5/5-V mixed-voltage I/O buffer realized with only thin gate-oxide devices is proposed. The new proposed mixed-voltage I/O buffer with simpler dynamic n-well bias circuit and gate-tracking circuit can prevent the undesired leakage current paths and the gate-oxide -reliability problem, which occur in the conventional CMOS I/O buffer. The new mixed-voltage I/O buffer has been fabricated and verified in a 0.25-mu m CMOS process to serve 2.5/5-V I/O interface. Besides, another 2.5/5-V mixed-voltage I/O buffer without the subthreshold leakage problem for high-speed applications is also presented in this work. The speed, power consumption, area, and-noise among these mixed-voltage I/O buffers are also compared and discussed. The new proposed mixed-voltage I/O buffers can be easily scaled toward 0.18- mu m (or below) CMOS processes to serve other mixed-voltage I/O interfaces, such as 1.8/3.3-V interface.
Effects of metallo-organic decomposition agents on thermal decomposition and electrical conductivity of low-temperature-curing silver paste
(2006-09-01)
Lu, Chun-An
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Lin, Pang
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Lin, Hong-Ching
;
Wang, Sea-Fue
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材料科學與工程學系
Six low-temperature-curing silver pastes were prepared from silver flake, alpha-terpineol and, various metallo-organic decomposition (MOD) compounds. The thermal decomposition behaviors of the pastes were determined. The microstructures and resistivities of screen-printed films on alumina substrate after thermal treatment were characterized and discussed. Results indicated that 2-ethylhexanoate possesses the lowest decomposition temperature (190.3 degrees C) among the MOD agents studied, and it forms silver particles to promote the linking of silver flake powders and thus reduces the resistivity to < 13 mu Omega.cm at a temperature as low as 200 degrees C.
Preparation and characterization of smart magnetic hydrogels and its use for drug release
(2006-09-01)
Liu, Ting-Yu
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Hu, Shang-Hsiu
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Liu, Kun-Ho
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Liu, Dean-Mo
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Chen, San-Yuan
The magnetic hydrogels were successfully fabricated by chemically cross-linking of gelatin hydrogels and Fe(3)O(4) nanoparticles (ca. 40-60 nm) through genipin (GP) as cross-linking agent. The cross-sectional SEM observation demonstrates that the Fe(3)O(4) nanoparticles were fairly uniformly distributed in the gelatin matrix. Moreover, in vitro release data reveal that drug release profile of the resulting hydrogels is controllable by switching on or off mode of a given magnetic field. While applying magnetic fields to the magnetic hydrogels, the release rate of vitamin B(12) of the hydrogels was considerably decreased as compared with those when the field was turned off, suggesting a close configuration of the hydrogels as a result of the aggregation of Fe(3)O(4) nanoparticles. Based on this on-&-off mechanism, the smart magnetic hydrogels based on the gelatin-ferrite hybrid composites can be potentially developed for application in novel drug delivery systems. (C) 2006 Elsevier B. V. All rights reserved.
Symmetric quantiles and their applications
(2006-09-01)
Chiang, Yuang-Chin
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Chen, Lin-An
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Yang, Hsien-Chueh Peter
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統計學研究所
;
Institute of Statistics
To develop estimators with stronger efficiencies than the trimmed means which use the empirical quantile, Kim (1992) and Chen & Chiang (1996), implicitly or explicitly used the symmetric quantile, and thus introduced new trimmed means for location and linear regression models, respectively. This study further investigates the properties of the symmetric quantile and extends its application in several aspects. ( a) The symmetric quantile is more efficient than the empirical quantiles in asymptotic variances when quantile percentage a is either small or large. This reveals that for any proposal involving the alpha th quantile of small or large alpha s, the symmetric quantile is the right choice; (b) a trimmed mean based on it has asymptotic variance achieving a Cramer-Rao lower bound in one heavy tail distribution; ( c) an improvement of the quantiles-based control chart by Grimshaw & Alt ( 1997) is discussed; (d) Monte Carlo simulations of two new scale estimators based on symmetric quantiles also support this new quantile.
Stepped changes of monovalent ligand-binding force during ligand-induced clustering of integrin alpha(IIB)beta(3)
(2006-09-01)
Hsieh, Chia-Fen
;
Chang, Bo-Jui
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Pai, Chyi-Huey
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Chen, Hsuan-Yi
;
Tsai, Jin-Wu
Recent evidence demonstrated that conformational changes of the integrin during receptor activation affected its binding to extracellular matrix; however, experimental assessment of ligand-receptor binding following the initial molecular interaction has rarely been carried out at a single-molecule resolution. In the present study, laser tweezers were used to measure the binding force exerted by a live Chinese hamster ovary cell that expressed integrin alpha(IIb)beta(3) (CHO alpha(IIb)beta(3)), to the bead carrier coated with the snake venom rhodostomin that served as an activated ligand for integrin alpha(IIb)beta(3). A progressive increase of total binding force over time was noticed when the bead interacted with the CHO alpha(IIb)beta(3) cell; such an increase was due mainly to the recruitment of more integrin molecules to the bead-cell interface. When the binding strength exerted by a single ligand-receptor pair was derived from the "polyvalent" measurements, surprisingly, a stepped decrease of the "monovalent binding force" was noted (from 4.15 to 2.54 piconewtons (pN)); such decrease appeared to occur during the ligand-induced integrin clustering process. On the other hand, the mutant rhodostomin defective in clustering integrins exhibited only one (1.81 pN) unit binding strength.