Browsing by Issue Date, starting with "2015-11-01"

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The Influences of Boundary Shapes on Polarization Characteristics and Lasing Modes in Broad-Area Vertical-Cavity Surface-Emitting Lasers With Cryogenic Detuning: Regular Versus Chaotic Cavities
(2015-11-01)
Yu, Yan-Ting
;
Tuan, Pi-Hui
;
Chiang, Po-Yi
;
Su, Kuan-Wei
;
Huang, Kai-Feng
The broad-area rectangular-shaped and stadiumshaped VCSELs with nearly the same aspect ratio are designed to explore the influence of lateral boundary shapes on polarization states and lasing spectra with large detuning by cryogenic cooling. For the rectangular-shaped VCSEL, the lasing modes usually exhibit linearly polarized state and their far-field emissions mainly concentrate on four diagonal directions. On the other hand, the lasing modes of the stadium-shaped VCSEL generally display two orthogonally polarized states and their far-field emissions extensively spread on azimuthal directions. More intriguingly, the lasing spectra of the two devices clearly manifest the features of the energy-level distribution in regular and chaotic quantum billiards, respectively.
Long-range interactions of bismuth growth on monolayer epitaxial graphene at room temperature
(2015-11-01)
Chen, H. -H.
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Su, S. H.
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Chang, S. -L.
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Cheng, B. -Y.
;
Chong, C. -W.
Long-range electronic interaction between Bismuth (Bi) adatoms on graphene formed on a 4H-SiC (0001) substrate are clearly observed at room temperature (T = 300 K). Using scanning tunneling microscopy (STM) and density functional theory (DFT) calculations, we have demonstrated that such oscillatory interaction results mainly from the mediation of graphene Dirac-like electrons and the effect of the corrugated surface of SiC substrate. These two factors cause the observed oscillatory interaction with characteristic distribution distances and linear arrangements of Bi adatoms. The present study sheds light on understanding and controlling the nucleation of adatoms and subsequent growth of nanostructures on graphene surface. (C) 2015 Elsevier Ltd. All rights reserved.
Compressible direct numerical simulation with a hybrid boundary condition of transitional phenomena in natural convection
(2015-11-01)
Li, Chung-Gang
;
Tsubokura, Makoto
;
Fu, Wu-Shung
;
Jansson, Niclas
;
Wang, Wei-Hsiang
We investigate the phenomena involved in the transition from laminar to turbulent flow in natural convection through a channel using compressible direct numerical simulation (DNS). The Roe numerical scheme with preconditioning and dual time stepping is employed to handle slow natural convection flows with large temperature differences and variable densities. A hybrid boundary condition that combines absorbing and non-reflecting boundary conditions is applied at the inlet and outlet, which does not require a priori knowledge of the flow rate. No empirically derived turbulence parameters are required in the DNS code. The numerical predictions are qualitatively consistent with published experimental data and the transition point can be accurately captured. Our results show that the transitional phenomena can be naturally induced by the interactions between the buoyancy force and shear stress without prescribing any fluctuations at the inlet. We submit that the numerical scheme and model configuration developed in this study has the potential to be a benchmark case for evaluating the accuracy of other turbulence models. (C) 2015 Elsevier Ltd. All rights reserved.
為愛而聲　音樂力量無國界
(2015-11-01)
李宗諺
;
Department of Communication and Technology
;
傳播與科技學系
蘇聯作曲家普羅高菲夫說：「音樂歌頌人們的生活，引導人們走向光明的未來。」歌手們齊聚一堂，用歌聲向這個世界傳播愛。
Accurate intensity calibration for low wavenumber (-150 to 150cm(-1)) Raman spectroscopy using the pure rotational spectrum of N-2
(2015-11-01)
Okajima, Hajime
;
Hamaguchi, Hiro-o
;
應用化學系
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應用化學系分子科學碩博班
;
Department of Applied Chemistry
We report on an accurate intensity calibration method for low wavenumber Raman spectroscopy. It uses the rotational Raman spectrum of N-2. The intensity distributions in the rotational Raman spectra of diatomic molecules are theoretically well established. They can be used as primary intensity standards for intensity calibration. The intensity ratios of the Stokes and anti-Stokes transitions originating from the same rotational levels are not affected by thermal population. Taking the effect of rotation-vibration interactions appropriately into account, we are able to calculate these intensity ratios theoretically. The comparison between the observed and calculated ratios of the N-2 pure rotational spectrum provides an accurate relative sensitivity curve (error similar to 5 x 10(-4)) in the wavenumber region of -150 to 150 cm(-1). We determine the temperature of water solely from the low wavenumber Raman spectra, using a thus calibrated spectrometer. The Raman temperature shows an excellent agreement with the thermocouple temperature, with only 0.5 K difference. The present calibration technique will be highly useful in many applications of low wavenumber quantitative Raman spectroscopy. Copyright (C) 2015 John Wiley & Sons, Ltd.
喚起國族情懷最動人的樂章
(2015-11-01)
徐義薇
;
Department of Communication and Technology
;
傳播與科技學系
最單純的音樂，傾訴最真實的心聲。
臺灣客家現代族群想像的三種類型：民族認同、公民權利以及認知框架
(國立交通大學客家文化學院, 2015-11)
柯朝欽
;
Chao-ching Ko
本文首先從族群理論的角度詮釋王甫昌（2003）關於現代客家族群想像的說法，以提供不同學科領域的客家研究者對社會學式的族群研究有更多的理解。本文認為王甫昌對現代臺灣客家族群想像的分析著重在將其視為一種社會學意義下的「族群」屬性，也就是一種現代「公民權利」意義上的族群。接著，本文借用Anthony D. Smith的「族群－民族」（ethnic-nation）理論，以及Roger Brubaker的「族群認知」（ethnicity of cognitive）論述，提出另外兩個關於現代客家族群想像的類型，以與王甫昌的論點進行對話。本文認為，王甫昌定義下的現代客家族群想像是一個當代多元文化社會下的族群想像，這是一種建立在多數與少數社會互動下的族群權利規範想像。但我們不能忽視另外一種建立在族群－民族傳承下的族群象徵想像，以及臺灣客家在2000年之後進入了大量制度化與法制化的族群想像方式。
Use of fiber Bragg grating (FBG) for stable and tunable erbium-doped fiber ring laser with single-longitudinal-mode (SLM) output
(2015-11-01)
Yeh, Chien-Hung
;
Chen, Hone-Zhang
;
Chen, Jhih-Yu
;
Chow, Chi-Wai
;
光電工程學系
In this demonstration, we propose and investigate a stable C-band erbium-doped fiber (EDF) laser with compound-ring cavity. To achieve wavelength tunability with single-longitudinal-mode (SML) output, the sub-ring scheme and fiber Bragg grating (FBG) are used inside the ring cavity. Here, different lasing wavelengths can be selected by employing different Bragg wavelengths of FBGs. In this experiment, the obtained optical signal to noise ratios (OSNRs) and output powers are larger than 44.5 dB and 8.0 dBm respectively in the tuning range of 1531.70-1547.88 nm. Moreover, the output wavelength and power fluctuations of the proposed EDF laser are less than 0.02 nm and 0.1 dB in an observation time of 30 min, respectively.
Time-resolved measurements of photoinduced change in electrical conductivity of the molecular conductor lambda-(BETS)(2)FeCl4
(2015-11-01)
Oinuma, Kaname
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Iimori, Toshifumi
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Ohta, Nobuhiro
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應用化學系
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應用化學系分子科學碩博班
Photoinduced change in electrical conductivity of the magnetic molecular conductor lambda-(BETS)(2)FeCl4, where BETS represents bis(ethylenedithio)tetraselenafulvalene, has been examined with nanosecond laser pulse excitation. Time-resolved measurements of the photocurrent have been carried out at low temperatures across the T-MI at which phase transition occurs between the metallic phase and the antiferromagnetic insulating phase. Transient increase of the electrical conductivity is induced by photoexcitation at any temperatures across the T-MI. Time profile of the transient photoresponse shows a maximum of the peak amplitude near the T-MI. The decay lifetime of the photoresponse divergently increases at temperatures lower than the T-MI, as the temperature approaches the T-MI. This result is ascribed to the critical slowing down in antiferromagnets. The dimensionality of the magnetic coupling is discussed on the basis of the critical exponent of the observed divergence. (C) 2015 Elsevier Ltd. All rights reserved.
ALT　超然勝負的幽默感
(2015-11-01)
趙廣絜
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Department of Communication and Technology
;
傳播與科技學系
Arthur Lin是NBA四格漫畫ALT的創辦人，他改變了台灣人看NBA的方式。
天生電音　海爾賽
(2015-11-01)
黃吏玄
;
Department of Communication and Technology
;
傳播與科技學系
海爾賽，以渲染力十足的現場演唱，和出色的創作才能帶來令人驚豔的作品。
Investigation on SCR-based ESD protection device for biomedical integrated circuits in a 0.18-mu m CMOS process
(2015-11-01)
Lin, Chun-Yu
;
Chiu, Yan-Lian
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生醫電子轉譯研究中心
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Biomedical Electronics Translational Research Center
In these decades, integrated circuits for biomedical electronics applications have been designed and implemented in CMOS technologies. In order to be safely used by human, all microelectronic products must meet the reliability specifications. Therefore, electrostatic discharge (ESD) must be taken into consideration. To protect the biomedical integrated circuits in CMOS technologies from ESD damage, a dual-directional silicon-controlled rectifier (DDSCR) device was presented in this work. Experimental results show that the DDSCR has the advantages of high ESD robustness, low leakage, large swing tolerance, and good latchup immunity. The DDSCR was suitable for ESD protection in biomedical integrated circuits. (C) 2015 Elsevier Ltd. All rights reserved.
Design and Analysis of Unequal Missing Protection for the Grouping of RFID Tags
(2015-11-01)
Su, Yi-Sheng
;
Wang, Chung-Hsuan
;
電機資訊學士班
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
In this paper, we address the issue of unequalmissing protection (UMP) for the design of grouping of radio-frequency identification (RFID) tags. While relying on group generation matrices, grouping of RFID tags allows verifying the integrity of a collection of tags without the requirement for accessing external systems, and can be extended to identify missing tags. Motivated by application needs that call for UMP among the tags, we first introduce the concepts of UMP for grouping of RFID tags and its extended counterpart, with which missing tags with high missing protection levels are more easily counted or identified than those with low missing protection levels. We then present simple yet effective schemes to realize grouping of RFID tags with UMP and its extended counterpart. The proposed schemes not only can easily fulfill the requirement of UMP among the tags, but also offer flexibility in constructing UMP group generation matrices. We also characterize key objects in order to further study grouping of RFID tags with UMP and its extended counterpart, called consistent and unidentifiable sets, respectively. This characterization in turn enables theoretical analysis of the error rate from the perspective of a tag. Theoretical and simulation results are presented to demonstrate the efficiencies of the proposed schemes for the design of grouping of RFID tags with UMP.
Low-Complexity ML Detectors for Generalized Spatial Modulation Systems
(2015-11-01)
Lin, Chun-Tao
;
Wu, Wen-Rong
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Liu, Chia-Yu
;
傳播研究所
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Institute of Communication Studies
Spatial modulation (SM) combined with spatial multiplexing is a newly developed transmission scheme in multiple-input multiple-output (MIMO) systems. The resultant system, referred to as generalized SM (GSM), can use the maximum-likelihood (ML) detector jointly detecting the antenna-subset (AS) index and symbol vector. As known, the ML detector can achieve optimum performance; however, its computational complexity can be prohibitively high when the dimension of the GSM system is large. In this paper, we propose new methods to solve the problem. The main idea is to split the detection into two stages, one for the AS index and the other for the symbol vector. For the detection of the AS index, we develop two methods, referred to as Gaussian approximation and QR projection. Once the AS index is detected, conventional low-complexity ML detectors can be applied for the detection of the symbol vector. The diversity order for the proposed methods are further analyzed and an enhanced method is also proposed to achieve near-optimum performance. Finally, the proposed methods are extended to conduct soft detection of GSM systems. Simulations show that our methods significantly outperform existing ones while the detection complexity remains similar.
非人統治　數值化的世界
(2015-11-01)
吳昀蒨
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Department of Communication and Technology
;
傳播與科技學系
【PSYCHO-PASS心靈判官】是一系列科幻和警匪為題材的日本動畫，討論非人類統治的利與弊，並提出新的思考方向。
Theoretical Study on Surface Mode in Photonic Crystal Fishbone Nanocavity
(2015-11-01)
Lu, Tsan-Wen
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Lee, Po-Tsung
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光電工程學系
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Department of Photonics
We propose and theoretically investigate a novel 1-D photonic crystal fishbone (FB) that can sustain surface waves. By designing a nanocavity in an FB, the confined surface mode with a high quality factor (similar to 10(5)) and extremely concentrated field near the FB surface (small mode volume, similar to 2.3 x 10(-2)(lambda/2)(3)) cause strong interactions between light and the surrounding medium for optical sensing and manipulation. In simulation, as an optical sensor, the proposed design achieved a high index sensitivity of 650 nm/RIU and minimum detectable index variation of 2 x 10(-5). As optical tweezers, a simulated injected optical threshold power of only 80 mu W is needed for stably trapping a polystyrene sphere (PS) 100 nm in diameter. In addition, a method of selectively trapping a PS of specific size is theoretically proposed via our design. We believe that our proposed FB nanocavity with a surface mode would provide enhanced features for on-chip optical sensors and tweezers.
Triggering and Relay Node Selection for Self-User Relaying
(2015-11-01)
Chou, Chie Ming
;
Huang, Ching-Yao
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Self-user relaying technology is designed to support multiple self-owned devices especially when wearable devices are becoming more popular. In this letter, with a consideration of power control and discontinuous reception mechanism, a power model and energy metric are derived to analyze self-user relaying performance. Results show that under a typical traffic model, self-user relaying can improve energy performance when the relay node itself has the maximum traffic volume. Additionally, a simple battery budget threshold based relay node selection is suggested for limited battery budget of nodes.
中英文客家研究相關學位論文書目彙編：2013-2014 年
(國立交通大學客家文化學院, 2015-11)
張珈瑜
;
Chia-yu Chang
本書目共收入 476篇學位論文，包括 24篇博士論文 (臺灣18篇、中國 6篇)、452篇碩士論文。
Two-phase pressure drops and flow pattern observations in 90 degrees bends subject to upward, downward and horizontal arrangements
(2015-11-01)
Hsu, Li-Chieh
;
Chen, Ing Youn
;
Chyu, Chien-Min
;
Wang, Chi-Chuan
;
機械工程學系
In this study, single-phase/two-phase frictional characteristics and flow patterns of 900 bends are experimentally investigated. The two bends have inner diameters (D) of 5.5 and 9.5 mm with tube curvature ratio (2R/D) of 5.4 and 4.2, respectively. The bends are installed either an upward, horizontal or downward arrangement. For results concerned with single-phase flow, the bend friction factor (f(B)) is always greater than that of the straight tubes at the same liquid Reynolds number. On the other hand, the f(B) values for D = 9.5 mm with smaller curvature ratio are greater than those of D = 5.5 mm. The resultant two-phase frictional pressure drops of 90 bend are well predicted by the Sanchez Silva et al. [14]\'s correlation. For the two-phase frictional pressure gradient, the upward arrangement is greater than that of the horizontal arrangement due to swirled motion and liquid flow reversal. The flow reversals are observed for upward flow arrangement at specific flow pattern and pressure gradient. However, no swirled motion and liquid flow reversal is seen in the downward arrangement. As mass flux and quality increase, the differences of pressure drop among the three arrangements are getting smaller due to the appreciable offset by the rising flow inertia. Meanwhile, the liquid flow reversal is more evidently observed in the large diameter bend. Flow pattern map showing the region of liquid flow reversal is shown on the diagram of the superficial gas velocity (U-GS) versus superficial liquid velocity (U-LS). The region for liquid flow reversal for D = 9.5 mm is much greater than that of D = 5.5 mm. For D = 5 mm, there is no liquid flow reversal when U-GS is above 2 m/s. On the other hand, the threshold value is raised to 4 m/s for the 9.5 mm internal diameter tube. (C) 2015 Elsevier Inc. All rights reserved.
說不出口的告白　只怕想家
(2015-11-01)
薛如真
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Department of Communication and Technology
;
傳播與科技學系
阿坤，一個常被人誤以為黑道大哥的霸氣男子，在家，他則是一個溫柔體貼的好男人，代表薛爸爸。