Browsing by Issue Date, starting with "2012-10-31"

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Ultrafast dynamics and phonon softening in Fe1+ySe1-xTex single crystals
(2012-10-31)
Luo, C. W.
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Wu, I. H.
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Cheng, P. C.
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Lin, J-Y
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Wu, K. H.
The ultrafast quasiparticle dynamics of Fe1+ySe1-xTex single crystals were investigated by dual-color transient reflectivity measurements (Delta R/R) from 4.3 to 290 K. The electron-phonon coupling strength lambda (= 0.16-0.01) and the temperature-dependent energy of longitudinal-acoustic phonons were, respectively, obtained from the relaxation time of a fast component and the period of an oscillation component in Delta R/R. Such a small lambda demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent Delta R/R exhibits anomalous changes at T-c, 90 K and 230 K, unambiguously revealing the phase transition as well as the phonon softening via the magnetoelastic effect.
由吳濁流的《亞細亞的孤兒》看認同的產生
(2012-10-31)
施正鋒
;
開放教育推動中心
;
Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
Iterative One-Pot alpha-Glycosylation Strategy: Application to Oligosaccharide Synthesis
(2012-11-01)
Liu, Chih-Yueh Ivan
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Mulani, Shaheen
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Mong, Kwok-Kong Tony
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應用化學系
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Department of Applied Chemistry
Based on the combined use of dimethylformamide (DMF) modulation and neighboring group participation, three iterative one-pot a-glycosylation methods, i.e., one-pot (a,a)-, one-pot (beta,a)-, and one-pot (a,beta)-glycosylations, were developed. These methods are applicable to a range of thioglycosyl donors, confer stereocontrol in a-/beta-glycosidic bond formation, and thus provide for rapid access to oligosaccharides with various permutations of anomeric configurations. The utility of these one-pot glycosylation methods is demonstrated in the synthesis of eight non-natural and natural oligosaccharide targets, including the core 1 serine conjugate, core 8 serine conjugate, the D-Gal-a(1?3)-D-Glc-a(1?3)-L-Rha trisaccharide unit of the cell wall component in Streptococcus pneumoniae, and the D-Glc-a(1?2)-D-Glc-a(1?3)-D-Glc trisaccharide terminus of the N-linked glycan precursor. Confirmation of the anomeric configurations of these oligosaccharides is evidenced by 1H, 13C, 13C-non-proton decoupling, and heteronuclear correlation 2D NMR experiments. Global deprotection of selected oligosaccharide targets is illustrated.
Ultra-broadband amplified spontaneous emission source by using heterogeneous optical amplifier
(2012-11-01)
Yeh, C. H.
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Chow, C. W.
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Chen, J. H.
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Lu, S. S.
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光電工程學系
In this work, we propose and experimentally investigate an ultra-broadband amplified spontaneous emission (ASE) light source with 113.8 nm bandwidth (1446.2 to 1560.0 nm) by using a cascaded two-stage optical amplifier, which is consisted of semiconductor optical amplifier (SOA, 1st stage) and erbiumdoped fiber amplifier (EDFA, 2nd stage), when the output intensity is above -35 dBm/0.01 nm. And, the EDFA only uses a 3 m long erbium-doped fiber (EDF) with a 27 mW pumping power and SOA is driven at 200 mA bias current. Moreover, the proposed amplifier also can provide a broadband gain amplification of 114 nm in the wavelengths of 1464.0 and 1578.0 nm with the noise figure distribution of 6.8 to 8.1 dB.
USING DECISION ANALYSIS METHOD TO EVALUATE THE EFFECTIVENESS OF SIMILAR FUNCTION MEDICAL MATERIALS IN HOSPITAL
(2012-11-01)
Fang, N. C.
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Yao, M. J.
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Tseng, T. Y.
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交大名義發表
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National Chiao Tung University
Modeling the relationship between IT-mediated social capital and social support: Key mediating mechanisms of sense of group
(2012-11-01)
Tsai, Yuan-Hui
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Joe, Sheng-Wuu
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Lin, Chieh-Peng
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Wang, Rong-Tsu
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Chang, Yu-Hsiang
This study proposes a model based on social capital theory to explain the formation of social support in virtual groups. Although previous literature suggests a direct effect of social capital on social support in face-to-face groups (e.g., working teams), it remains uncertain if such an effect exists completely in the same way among virtual social groups that count heavily on computer-mediated communication. In this study's proposed model, social support is indirectly influenced by social capital and need for affiliation via the mediation of sense of group (which includes perceived membership, mutual influence, and immersion). Empirical testing of this model, by investigating working professionals in online social networking communities, confirms the applicability of social capital and need for affiliation among virtual groups. Group-level data were analyzed by the technique of path analysis to test our hypotheses. Lastly, managerial implications and limitations of the research are provided. (C) 2012 Elsevier Inc. All rights reserved.
A 1.2-V 5.2-mW 20-30-GHz Wideband Receiver Front-End in 0.18-mu m CMOS
(2012-11-01)
Li, Chun-Hsing
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Kuo, Chien-Nan
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Kuo, Ming-Ching
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
This paper presents a low-power wideband receiver front-end design using a resonator coupling technique. Inductively coupled resonators, composed of an on-chip transformer and parasitic capacitances from a low-noise amplifier, a mixer, and the transformer itself, not only provide wideband signal transfer, but also realize wideband high-to-low impedance transformation. The coupled resonators also function as a wideband balun to give single-to-differential conversion. Analytic expressions for the coupled resonators with asymmetric loads are presented for design guidelines. The proposed receiver front-end only needs a few passive components so that gain degradation caused by the passive loss is minimized. Hence, power consumption and chip area can be greatly reduced. The chip is implemented in 0.18-mu m CMOS technology. The experimental result shows that the -3-dB bandwidth can span from 20 to 30 GHz with a peak conversion gain of 18.7 dB. The measured input return loss and third-order intercept point are better than 16.7 dB and -7.6 dBm, respectively, over the bandwidth. The minimum noise figure is 7.1 dB. The power consumption is only 5.2 mW from a 1.2-V supply. The chip area is only 0.18 mm(2).
The paths embedding of the arrangement graphs with prescribed vertices in given position
(2012-11-01)
Teng, Yuan-Hsiang
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Tan, Jimmy J. M.
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Tsay, Chey-Woei
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Hsu, Lih-Hsing
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資訊工程學系
Let n and k be positive integers with n-ka parts per thousand yen2. The arrangement graph A (n,k) is recognized as an attractive interconnection networks. Let x, y, and z be three different vertices of A (n,k) . Let l be any integer with . We shall prove the following existance properties of Hamiltonian path: (1) for n-ka parts per thousand yen3 or (n,k)=(3,1), there exists a Hamiltonian path R(x,y,z;l) from x to z such that d (R(x,y,z;l))(x,y)=l; (2) for n-k=2 and na parts per thousand yen5, there exists a Hamiltonian path R(x,y,z;l) except for the case that x, y, and z are adjacent to each other.
A Near-Optimum Dynamic Voltage Scaling (DVS) in 65-nm Energy-Efficient Power Management With Frequency-Based Control (FBC) for SoC System
(2012-11-01)
Lee, Yu-Huei
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Chiu, Chao-Chang
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Peng, Shen-Yu
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Chen, Ke-Horng
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Lin, Ying-Hsi
A 65-nm energy-efficient power management with frequency-based control (FBC) is proposed to achieve the near-optimum dynamic voltage scaling (DVS) in a system-on-chip system. Since DVS and dynamic frequency scaling (DFS) operations are demanded for system processor, control loop of the proposed single-inductor dual-output (SIDO) power module is merged with the frequency-controlled phase-locked loop (PLL) to constitute the operation of hybrid control loop. This means that both DVS and DFS operations can be guaranteed and are not affected by process, supply voltage, and temperature variations. The proposed power management can receive the demand of system processor by hybrid control loop and can help realize the supply voltage with different operation tasks for near-optimum DVS operation. The fabricated chip occupies a 1.12-mm(2) silicon area. Experimental results show that the SIDO power module achieves a peak efficiency of 90% and the highest power reduction of 33% with the proposed near-optimum DVS operation.
Molecular genetic analysis reveals that a nonribosomal peptide synthetase-like (NRPS-like) gene in Aspergillus nidulans is responsible for microperfuranone biosynthesis
(2012-11-01)
Yeh, Hsu-Hua
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Chiang, Yi-Ming
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Entwistle, Ruth
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Ahuja, Manmeet
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Lee, Kuan-Han
Genome sequencing of Aspergillus species including Aspergillus nidulans has revealed that there are far more secondary metabolite biosynthetic gene clusters than secondary metabolites isolated from these organisms. This implies that these organisms can produce additional secondary metabolites, which have not yet been elucidated. The A. nidulans genome contains 12 nonribosomal peptide synthetase (NRPS), one hybrid polyketide synthase/NRPS, and 14 NRPS-like genes. The only NRPS-like gene in A. nidulans with a known product is tdiA, which is involved in terrequinone A biosynthesis. To attempt to identify the products of these NRPS-like genes, we replaced the native promoters of the NRPS-like genes with the inducible alcohol dehydrogenase (alcA) promoter. Our results demonstrated that induction of the single NRPS-like gene AN3396.4 led to the enhanced production of microperfuranone. Furthermore, heterologous expression of AN3396.4 in Aspergillus niger confirmed that only one NRPS-like gene, AN3396.4, is necessary for the production of microperfuranone.
Investigation on CDM ESD events at core circuits in a 65-nm CMOS process
(2012-11-01)
Lin, Chun-Yu
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Chang, Tang-Long
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Ker, Ming-Dou
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交大名義發表
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National Chiao Tung University
Among three chip-level electrostatic discharge (ESD) test standards, which were human-body model (HBM), machine model (MM), and charged-device model (CDM), the CDM ESD events became critical due to the larger and faster discharging currents. Besides input/output (I/O) circuits which were connected to I/O pads, core circuits also suffered from CDM ESD events caused by coupled currents between I/O lines and core lines. In this work, the CDM ESD robustness of the core circuits with and without inserting shielding lines were investigated in a 65-nm CMOS process. Verified in a silicon chip, the CDM ESD robustness of the core circuits with shielding lines were degraded. The failure mechanism of the test circuits was also investigated in this work. (C) 2012 Elsevier Ltd. All rights reserved.
Characterizations of polycrystalline silicon nanowire thin-film transistors enhanced by metal-induced lateral crystallization
(2012-11-01)
Su, Chun-Jung
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Huang, Yu-Feng
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Lin, Horng-Chih
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Huang, Tiao-Yuan
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電子工程學系及電子研究所
In this paper, we present a comprehensive study on the effects of layout design and re-crystallization temperature on the material and electrical characteristics of polycrystalline silicon thin-film transistors (poly-Si TFTs) with metal-induced lateral crystallized (MILC) nanowire (NW) channels. It is found that the off-state leakage current shows strong dependence on the arrangement of MILC seeding windows, while the number of smaller solid-phase-crystallized (SPC) grains in the channel is reduced by lowering the re-crystallization temperature, thus improving the on-state behavior. Moreover, owing to the spatial confinement for MILC fronts, small cross-section of the NW channel would result in little lateral crystallization, and thus retarding the enhancement in performance of MILC NW devices. (c) 2012 Elsevier Ltd. All rights reserved.
Application of aurintricarboxylic acid for the adherence of mouse P19 neurons and primary hippocampal neurons to noncoated surface in serum-free culture
(2012-11-01)
Lee, Tsung-Yih
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Chen, Wen-Shin
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Huang, Yung-An
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Liu, Ting-Wei
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Hwang, Eric
Dissociated primary neuron culture has been the most widely used model systems for neuroscience research. Most of these primary neurons are cultured on adhesion matrix-coated surface to provide a proper environment for cell anchorage under serum-free conditions. In this study, we provide an alternative technique to promote the adhesions of these neurons using aurintricarboxylic acid (ATA), a nonpeptide compound, without surface manipulations. We first demonstrated that ATA could promote Chinese hamster ovary cell attachment and proliferation in serum-free medium in a dosage-dependent manner. We later showed that ATA significantly enhanced the attachment of the retinoic acid differentiated P19 mouse embryonal carcinoma (P19) neurons, with an optimal concentration around 30 mu g/mL. A similar result was seen in primary hippocampal neurons, with an optimal ATA concentration around 15 mu g/mL. Further morphological assessments revealed that the average neurite length and neuronal polarization were almost identical to that obtained using a conventional method with poly-L-lysine surface. The advantages of using the ATA treatment technique for immunochemical analysis are discussed. (C) 2012 American Institute of Chemical Engineers Biotechnol. Prog., 2012
THERMAL DISSIPATION SUBSTRATE
(2012-11-01)
Wu YewChung Sermon
;
Chang Tai-Min
;
Chiu Yu Chia
;
Hu Jen-Li
The present invention related to a method for manufacturing a thermal dissipation substrate and a thermal dissipation substrate. The method includes steps of: (a) providing a substrate body having a surface; (b) forming a plurality of concave regions on the surface; and (c) filling the plurality of concave regions with a plurality of diamond materials. The thermal dissipation substrate includes: a substrate having a surface at a first horizontal; a plurality of regions formed on the surface at a second horizontal; and a plurality of diamond materials having a relatively high thermal coefficient and disposed on the plurality of regions.
Qualitative analysis of the fluorophosphonate-based chemical probes using the serine hydrolases from mouse liver and poly-3-hydroxybutyrate depolymerase (PhaZ) from Bacillus thuringiensis
(2012-11-01)
Huang, Yi-Long
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Chung, Tsai-Wen
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Chang, Chia-Mao
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Chen, Chih-Hau
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Liao, Chen-Chung
The serine hydrolase family consists of more than 200 members and is one of the largest enzyme families in the human genome. Although up to 50 % of this family remains unannotated, there are increasing evidences that activities of certain serine hydrolases are associated with diseases like cancer neoplasia, invasiveness, etc. By now, several activity-based chemical probes have been developed and are applied to profile the global activity of serine hydrolases in diverse proteomes. In this study, two fluorophosphonate (FP)-based chemical probes were synthesized. Further examination of their abilities to label and pull down serine hydrolases was conducted. In addition, the poly-3-hydroxybutyrate depolymerase (PhaZ) from Bacillus thuringiensis was demonstrated as an appropriate standard serine hydrolase, which can be applied to measure the labeling ability and pull-down efficiency of FP-based probes. Furthermore, mass spectrometry (MS) was used to identify the serine residue that covalently bonded to the active probes. Finally, these FP-based probes were shown capable of establishing the serine hydrolase profiles in diverse mouse tissues; the serine hydrolases pulled down from mouse liver organ were further identified by MS. In summary, our study provides an adequate method to evaluate the reactivity of FP-based probes targeting serine hydrolases.
可調光訊號延遲模組及方法
(2012-11-01)
陳智弘
;
高偉哲
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彭朋群
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林俊廷
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吳芳銘
本發明係關於一種可調光訊號延遲模組及方法，特別是一種將光放大器自行產生的自發性輻射激發逆向迴授回光放大器，且透過調整自發性輻射激發於迴授系統之光功率而取代傳統上同調居量振盪效應(coherent population oscillations)所需之幫浦雷射，並且藉此效應來改變光放大器之群折射率，進而達到延遲原輸入光訊號時序之目的。此外迴授光路所使用之光元件包含光衰減器、光濾波器以及光迴旋器等元件，讓使用者能透過調整迴授光路之光功率就能達到控制光訊號延遲時序之目的。本發明不但降低光訊號延遲模組之成本，同時系統體積亦可減少。
Fabrication of biomimetic device with PS-b-PNIPAAm copolymer pillars mimicking a gecko foot pad
(2012-11-01)
Chen, Jem-Kun
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Wang, Jing-Hong
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Cheng, Chih-Chia
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Ko, Fu-Hsiang
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應用化學系
Inspired by the climbing aptitude of geckos, a gecko's foot pad can alternately attach to and detach from almost any kind of surface. We firstly fabricated a multi-layer thin film with electrodes as a thermal device that could adjust the surface temperature by applying voltage. We sequentially used very-large-scale integration (VLSI) process and atom-transfer radical-polymerization (ATRP) process to generate well-defined pillar patterns of polymerized styrene as seta analogues and successively grafted n-isopropylacrylamide (NIPAAm) as thermally responsive terminating of the pillars to mimic the configuration of a real gecko's foot pad. Our fabrication strategy exploits surface textures of polystyrene (PS) and thermally responsive terminating of PNIPAAm, which could generate alternately ca. 88.1 and 11.3 nN of adhesive force at 0.2 and 2 V of applying voltage, respectively. The results indicate that the adjustable adhesive ability of the copolymer brushes could approach the climbing aptitude of a gecko much more closely through voltage tuning. The advantage of the processing strategy described here is the potential to fabricate a device of an artificial foot pad to mimic the climbing aptitude of geckos vividly. (C) 2012 Elsevier B.V. All rights reserved.
Watt-level high power passively mode-locked Nd:LuVO4 laser with carbon nanotube saturable absorber at 1.34 mu m
(2012-11-01)
Wang, Yong Gang
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Chen, Hou Ren
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Hsieh, Wen Feng
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Tsang, Yuen H.
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光電工程學系
The first Nd:LuVO4 ultrafast mode locking laser operating at 1.34 mu m is demonstrated by utilizing a polymer free single-walled carbon nanotube (SWCNT) absorber fabricated by the vertical evaporation technique. The fast recovery times of the absorber were measured to be 40 fs and 820 fs. The modulation depth of the absorber was about 2%. Passively mode-locked Nd:LuVO4 laser using this absorber was demonstrated. As high as 1.74 W continuous wave mode-locked pulses have been achieved with the pulse duration of 18 ps and the repetition of 125 MHz. Such kind of absorbers have great potential to be put into practical use because of their merit of high damage threshold, broad operational wavelength range and low cost of fabrication. (C) 2012 Elsevier B.V. All rights reserved.
Numerical solution of nonlinear matrix equations arising from Green's function calculations in nano research
(2012-11-01)
Guo, Chun-Hua
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Kuo, Yueh-Cheng
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Lin, Wen-Wei
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應用數學系
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Department of Applied Mathematics
The Green's function approach for treating quantum transport in nano devices requires the solution of nonlinear matrix equations of the form X + (C* + i eta D*)X-1(C + i eta D) = R+i eta P. where R and P are Hermitian, P + lambda D* + lambda D-1 is positive definite for all lambda on the unit circle, and eta -> 0(+). For each fixed eta > 0, we show that the required solution is the unique stabilizing solution X-eta. Then X-center dot = lim(eta -> 0+) X-eta is a particular weakly stabilizing solution of the matrix equation X + C*X-1C = R. In nano applications, the matrices R and C are dependent on a parameter, which is the system energy E. In practice one is mainly interested in those values of g for which the equation X + C*X-1C = R has no stabilizing solutions or, equivalently, the quadratic matrix polynomial P(lambda) = lambda C-2* - lambda R + C has eigenvalues on the unit circle. We point out that a doubling algorithm can be used to compute X-eta efficiently even for very small values eta, thus providing good approximations to X-*. We also explain how the solution X-* can be computed directly using subspace methods such as the QZ algorithm by determining which unimodular eigenvalues of P(lambda) should be included in the computation. In some applications the matrices C, D, R, P have very special sparsity structures. We show how these special structures can be exploited to drastically reduce the complexity of the doubling algorithm for computing X-eta. (C) 2012 Elsevier B.V. All rights reserved.
Precision Tool Condition Monitoring for Grinding Wheel in IC Manufacturing of Silicon Wafer
(2012-11-01)
Hsu, Ya-Chen
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Pearn, W. L.
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Chuang, Ya-Fei
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工業工程與管理學系
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Department of Industrial Engineering and Management
In integrated circuit (IC) manufacturing industries, wafer grinding is an important step because it improves wafer flatness and thickness. The diamond-grinding wheel used for grinding the wafers is expensive. Inevitably, the diamond-grinding wheel wears gradually during the grinding process, and the wafer surface is contaminated by grinding chips. Consequently, the fraction of defectives gradually becomes significant. In this situation, cost reduction is important for silicon wafer suppliers in the global market. Therefore, it is essential to monitor the grinding wheel in order to reduce the manufacturing cost and minimize the fraction of defectives. In this paper, we consider the grinding-wheel replacement problem in IC factories with the aim of determining the optimal replacement time for the grinding wheels. In order to maintain high wafer process quality and minimize the production cost, we propose a tool condition monitoring procedure for assessing the true capability at each time period of the grinding process and then find the optimal time for tool replacement. The procedure can be used practically for the silicon wafer manufacturing industry.