Browsing by Issue Date, starting with "2017-02"

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A Miniature Magnetic-Force-Based Three-Axis AC Magnetic Sensor with Piezoelectric/Vibrational Energy-Harvesting Functions
(2017-02-01)
Hung, Chiao-Fang
;
Yeh, Po-Chen
;
Chung, Tien-Kan
;
機械工程學系
;
國際半導體學院
In this paper, we demonstrate a miniature magnetic-force-based, three-axis, AC magnetic sensor with piezoelectric/vibrational energy-harvesting functions. For magnetic sensing, the sensor employs a magnetic-mechanical-piezoelectric configuration (which uses magnetic force and torque, a compact, single, mechanical mechanism, and the piezoelectric effect) to convert x-axis and y-axis in-plane and z-axis magnetic fields into piezoelectric voltage outputs. Under the x-axis magnetic field (sine-wave, 100 Hz, 0.2-3.2 gauss) and the z-axis magnetic field (sine-wave, 142 Hz, 0.2-3.2 gauss), the voltage output with the sensitivity of the sensor are 1.13-26.15 mV with 8.79 mV/gauss and 1.31-8.92 mV with 2.63 mV/gauss, respectively. In addition, through this configuration, the sensor can harness ambient vibrational energy, i.e., possessing piezoelectric/vibrational energy-harvesting functions. Under x-axis vibration (sine-wave, 100 Hz, 3.5 g) and z-axis vibration (sine-wave, 142 Hz, 3.8 g), the root-mean-square voltage output with power output of the sensor is 439 mV with 0.333 mu W and 138 mV with 0.051 mu W, respectively. These results show that the sensor, using this configuration, successfully achieves three-axis magnetic field sensing and three-axis vibration energy-harvesting. Due to these features, the three-axis AC magnetic sensor could be an important design reference in order to develop future three-axis AC magnetic sensors, which possess energy-harvesting functions, for practical industrial applications, such as intelligent vehicle/traffic monitoring, processes monitoring, security systems, and so on.
視調節微波動之量測系統及方法
(2017-02-01)
歐陽盟
;
邱俊誠
;
黃庭緯
;
蔡宜君
一種視調節微波動之量測系統包含一量測模組以及一處理模組。量測模組包含至少一第一感測元件，其用以貼附於一受測者之眼睛周圍，以量測一肌電圖訊號。處理模組與量測模組耦合。處理模組用以擷取一特定頻率範圍之肌電圖訊號作為視調節微波動之一量測指標，其中特定頻率範圍為0.1 Hz至100 Hz。上述量測系統可讓受測者在開放視野下進行量測，以避免受測者眼睛周圍之肌肉產生疲勞，且體積相對較小而有利於攜帶。同時亦揭示一種視調節微波動之量測方法。
太空漂流指南－ 2017 交大建築展
(2017-02)
交通大學藝文中心
;
交大建築研究所
;
National Chiao Tung University Arts Center
;
Institute of Architecture NCTU
自有歷史以來，人類對於「太空」（space）的好奇和想像從未停歇，各個時代都不斷發展新的科技器物或理解觀點來詮釋太空的奧秘，一旦新的假說出現，又不斷被新的理論和發現所挑戰，將人類的所知極限推向一個更為神秘的邊疆。文明的演進讓人類直擊各種超乎預期的天文現象，積累了對於各樣星系與星球的微渺認知，但所有未知星球間的物理距離和人類心理的想像距離是一樣的廣大，這一切既來自於外在，也發生於自身，所有理性且好奇的探索皆一再追問人類的內心並喚起自省。交大建築所這次將建築創作比擬在開放宇宙中的移動，「太空漂流指南」網羅建築所全所設計課的作品，每門 Studio 都是一顆顆獨立星球，此時此刻的建築創作不標榜無懼的英雄冒險，而是專注地看待面對外在條件衝突下，創作者本身的自我掙扎和價值判斷。每件作品都是創作者與未知想像和目標物的來回映射，創作者的意念迥然多樣，相較以往直接的作品呈現，本次展覽企圖以太空敘事使觀者能更了解題目意義和作品背後的價值、創作方法和想像。
Carbodicarbenes or Bent Allenes
(2017-02-01)
Wang, Ting-Hsuan
;
Chen, Wen-Ching
;
Ong, Tiow-Gan
;
應用化學系
;
Department of Applied Chemistry
The pursuit of unusual bonding environments of carbon species with non-octet electronic configurations has been quite active in fundamental organic and theoretical chemistry for many decades. In this respect, a distinct carbone species has been successfully isolated recently and defined as "carbodicarbene" or "bent allene." This neutral two-coordinated central carbon atom possesses two electron lone pairs, while its octet deficiency is overcome by sigma donation of N-heterocyclic carbenes (NHCs) bound to the central carbon. The present review is focused on the rich chemistry of carbodicarbenes in the aspects of synthesis, characterization, and ligand science of metal complex as well as their intrinsic reactivities.
Evaluation and Reliability Assessment of GaN-on-Si MIS-HEMT for Power Switching Applications
(2017-02-01)
Chou, Po-Chien
;
Chen, Szu-Hao
;
Hsieh, Ting-En
;
Cheng, Stone
;
del Alamo, Jesus A.
This paper reports an extensive analysis of the physical mechanisms responsible for the failure of GaN-based metal-insulator-semiconductor (MIS) high electron mobility transistors (HEMTs). When stressed under high applied electric fields, the traps at the dielectric/III-N barrier interface and inside the III-N barrier cause an increase in dynamic on-resistance and a shift of threshold voltage, which might affect the long term stability of these devices. More detailed investigations are needed to identify epitaxy- or process-related degradation mechanisms and to understand their impact on electrical properties. The present paper proposes a suitable methodology to characterize the degradation and failure mechanisms of GaN MIS-HEMTs subjected to stress under various off-state conditions. There are three major stress conditions that include: V-DS = 0 V, off, and off (cascode-connection) states. Changes of direct current (DC) figures of merit in voltage step-stress experiments are measured, statistics are studied, and correlations are investigated. Hot electron stress produces permanent change which can be attributed to charge trapping phenomena and the generation of deep levels or interface states. The simultaneous generation of interface (and/or bulk) and buffer traps can account for the observed degradation modes and mechanisms. These findings provide several critical characteristics to evaluate the electrical reliability of GaN MIS-HEMTs which are borne out by step-stress experiments.
族譜
(國立陽明大學牙醫校友會, 2017-02)
陽明大學牙醫系系學會
[院系消息]
(國立交通大學資訊學院, 2017-02)
林珮雯
本刊每學期發刊一期，做為本院師生與系友、家長的溝通橋樑。每期報導本院近期研究現況，內容包括人事動態、學人來訪以及國際交流等。期能經由本刊使讀者掌握資訊學院最新動態，促進彼此互動。
Supramolecular control over the morphology of bio-inspired poly(3-hexylthiophene) for organic thin film transistors
(2017-02)
Lin, Yen-Ting
;
Singh, Ranjodh
;
Kuo, Shiao-Wei
;
Ko, Fu-Hsiang
;
材料科學與工程學系
We have developed a strategy for modifying the channel layer of organic thin film transistors (OTFTs) through side-chain induced self-organization into a well-ordered film. To obtain selectively self-patterned layers, we treated an adenine-functionalized poly(3-hexylthiophene) (PAT) with adenosine triphosphate (ATP). Using this strategy, interchain charge transport resulting from pi-conjugation was selected to control the polymer morphology, without the need of additional chemical synthetic processing. The side chain-induced self-organization can be understood in terms of supramolecular interactions. The pi-electrons were delocalized among the thiophene rings, thereby improving the interchain charge transport ability; the resulting planar pi-electron system in PAT: ATP resulted in closer intermolecular pep distances, facilitating enhanced charge carrier mobility within a fibrillar structure. The PAT: ATP-based OTFT device exhibited moderate to improved electronic characteristics, with an average field mobility of 3.2 x 10(-4) cm(2) V-1 s(-1) at -30 V and a threshold voltage (V-th) of 5 V, and an on/off current ratio of 10(6). This method has great potential for inducing selective intermolecular interactions in fully solution processed electronic devices. (C) 2016 Elsevier B.V. All rights reserved.
Multimodal Video-to-Near-Scene Annotation
(2017-02)
Chou, Chien-Li
;
Chen, Hua-Tsung
;
Lee, Suh-Yin
;
交大名義發表
;
資訊工程學系
Traditional video annotation approaches focus on annotating keyframes/shots or whole videos with semantic keywords. However, the extraction processes of keyframes/shots might lack semantic meanings, and it is hard to use a few keywords to describe the content of a long video with multiple topics. In this work, near- scenes, which contain similar concepts, topics, or semantic meanings, are designed for better video content understanding and annotation. We propose a novel framework of hierarchical video-to-near-scene annotation not only to preserve but also to purify the semantic meanings of near- scenes. To detect near-scenes, a pattern- based prefix tree is first constructed to fast retrieve near- duplicate videos. Then, the videos containing similar near- duplicate segments and similar keywords are clustered with consideration of multimodal features including visual and textual features. To enhance the precision of near-scene detection, a pattern-to-intensity- mark (PIM) method is proposed to perform precise frame- level near- duplicate segment alignment. For each near- scene, a video-to-concept distribution model is designed to analyze the representativeness of keywords and discriminations of clusters by the proposed potential term frequency and inverse document frequency and entropy. Tags are ranked according to video-to-concept distribution scores, and the tags with the highest scores are propagated to near-scenes detected. Extensive experiments demonstrate that the proposed PIM outperforms state-of-the-art approaches compared in terms of quality segments and quality frames for near-scene detection. Furthermore, the proposed framework of hierarchical video- to-near- scene annotation can achieve high quality of near-scene annotation in terms of mean average precision.
Gd2O3:RE3+ and GdAIO(3):RE3+ (RE = Eu, Dy) Phosphor: Synthesis, Characterization and Bioimaging Application
(2017-02-01)
Selvalakshmi, Thangaraj
;
Venkatesan, Parthiban
;
Wu, Shu-Pao
;
Velmathi, S.
;
Bose, A. Chandra
Citrate based sol-gel method is used to synthesize Gd2O3:RE3+ and GdAlO3: RE3+ (RE = Eu, Dy) phosphors. In the present work, the phosphors are characterized using the techniques like X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). Fluorescence confocal microscopy reveals the potential usage of phosphors in biological medium for biolabeling application. XRD patterns confirm the phase purity of Gd2O3 and GdAlO3. The crystallite size and lattice parameters are estimated from XRD result. FTIR spectra are used to investigate the functional group present in the phosphor. The optical emission properties imply that the emission peak positions on Eu3+ or Dy3+ ion are size and host independent. Finally, RAW 264.7 macrophages cell line is used to test the bioimaging performance of the phosphors.
Overview of the Special Issue "PM2.5 in Asia" for 2015 Asian Aerosol Conference
(2017-02-01)
Balasubramanian, Rajasekhar
;
Gao, Xiang
;
Hatakeyama, Shiro
;
Hwang, Jungho
;
Tsai, Chuen-Jinn
Photoluminescence properties of MgxZn1-xO films grown by molecular beam epitaxy
(2017-02-01)
Wu, T. Y.
;
Huang, Y. S.
;
Hu, S. Y.
;
Lee, Y. C.
;
Tiong, K. K.
The optical properties of MgxZn1-xO films with x=0.03, 0.06, 0.08, and 0.11 grown by molecular beam epitaxy (MBE) have been studied by temperature-dependent photoluminescence (PL) measurement. It is presented that the full-width at half-maximum (FWHM) of the 12 K PL spectrum of MgZnO films increases with increasing Mg concentration and would deviate significantly from the simulation curve of Schubert model with higher Mg contents. The abnormal broader PL FWHM is inferred from larger compositional fluctuation by incorporating higher Mg contents, which results in larger effect of excitonic localization to induce more significant S-shaped behavior of the PL peak energy with temperature dependence. Additionally, the degree of localization increases as the linear proportion of the PL FWHM, indicating that the excitonic behavior in MgZnO films belong to the strong localization effect.
Measurement of transparent Alcian blue-stainable materials in freshwater by a centrifugation-based method
(2017-02-01)
Nguyen Thi Thuy
;
Huang, Chihpin
;
Lin, Justin Chun-Te
;
環境工程研究所
;
防災與水環境研究中心
Transparent exopolymer particles (TEP) are particularly abundant in diverse aqueous environments and regarded as a main contributor to biofilm and membrane biofouling. In this study, we optimized a centrifugation- based approach to analyze Alcian blue-stainable materials (ABSM), which cover TEP and acidic polysaccharide-related substances, for reservoirs in Taiwan. Stability of the dye in terms of time and acidic conditioning was firstly monitored intensively at pH 2.5 and 4.0, with and without stirring. Absorbance of dye-reacted solutions of the reference materials ( xanthan gum) and natural ABSM sampled from reservoirs were both examined under different relative centrifugal forces (RCF). Separation efficiency of complexes generated between Alcian blue and the targeting materials under broad range of RCFs (from 1,089 to 34,957 xG) was further assessed based on particle hydrodynamic size distributions, which then provided an insight of their fates that former methods were not addressed. Our results showed centrifugation at high RCFs ( higher than 12,096 xG) was effective to separate these complexes comparing with previous studies only conducted at lower RCFs. Application of the proposed method for five freshwater samples revealed notable high concentrations of Alcian blue-stainable dissolved fraction that could be a critical factor in developing feasible antifouling strategies for membranes used in water treatment.
Physics prospects of the Jinping neutrino experiment
(2017-02-01)
Beacom, John F.
;
Chen, Shaomin
;
Cheng, Jianping
;
Doustimotlagh, Sayed N.
;
Gao, Yuanning
The China Jinping Underground Laboratory (CJPL), which has the lowest cosmic-ray muon flux and the lowest reactor neutrino flux of any laboratory, is ideal to carry out low-energy neutrino experiments. With two detectors and a total fiducial mass of 2000 tons for solar neutrino physics (equivalently, 3000 tons for geo-neutrino and supernova neutrino physics), the Jinping neutrino experiment will have the potential to identify the neutrinos from the CNO fusion cycles of the Sun, to cover the transition phase for the solar neutrino oscillation from vacuum to matter mixing, and to measure the geo-neutrino flux, including the Th/U ratio. These goals can be fulfilled with mature existing techniques. Efforts on increasing the target mass with multi-modular neutrino detectors and on developing the slow liquid scintillator will increase the Jinping discovery potential in the study of solar neutrinos, geo-neutrinos, supernova neutrinos, and dark matter.
Feature issue introduction: colloidal systems
(2017-02-01)
Lee, Wei
;
de Araujo, Cid B.
;
Khanarian, Garo
;
Zyryanov, Victor
;
光電學院
This feature issue on "Colloidal Systems" of Optical Materials Express highlights recent advances in a broad scope of colloidal particles and structures. It consists of seven papers primarily in the areas of metal colloids, polymer composites and quantum dots in colloidal solutions. It is hoped that this special theme issue can urge and stimulate further research endeavors into novel colloidal materials with improved optical or photonic properties to accelerate scientific discoveries in the field of optical colloids, thereby promoting their structural and device performance for potential photonic applications. (C) 2017 Optical Society of America
【活動花絮】交換生經驗　讓你更獨當一面
(國立交通大學資訊學院, 2017-02)
林珮雯
本院推動「資心專案暨海外實習生/交換生募款計畫」去年資助7位同學出國交換已返校，學院舉辦分享會，邀請學生分享出國交換心得。摘錄同學們心得分享，並再次真切地感謝每位捐款人，對台灣人才培育的用心關注。
[獲獎捷報]
(國立交通大學資訊學院, 2017-02)
林珮雯
教師榮譽、學生榮譽
On Different-Dimensional Deployment Problems of Hybrid VANET-Sensor Networks with QoS Considerations
(2017-02-01)
Lin, Chun-Cheng
;
Chen, Peng-Chung
;
Chang, Li-Wei
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
To enhance vehicular ad hoc networks (VANETs) with the ability to detect road conditions, hybrid VANET-sensor networks (HVSNs) additionally deploy a large number of wireless sensors on road sides, so as to provide a safer driving environment. Most of the previous works on network deployment problems considered too simplified problem settings, and few of them focused on deploying HVSNs. To meet more practical requirements, this paper investigates the problem of deploying roadside units (RSUs) to serve sensors on three different-dimensional road settings (i.e., a one-dimensional road, a road represented as grid points, and a dense network environment) in HVSNs with two objectives (i.e., to minimize the total distance and the total number of hops from sensors to their respective closest RSUs) and two QoS constraints (i.e., for maximal number of hops and capacity). Achieving the two objectives can effectively decrease the probability of transmission interference and lead to shorter transmission time to inform drivers of unexpected events. Since the optimal deployment problems for a grid road and a dense HVSN cannot be solved analytically, this paper creates mathematical programming models for the problems, and further proposes an improved harmony search algorithm. By simulation in different-size instances and statistical analysis, the proposed approaches show promising performance in solving the problems.
【資訊系友】種子教育基金會董事長　鄧強生：知新致遠、崇實篤行
(國立交通大學資訊學院, 2017-02)
林珮雯
前思源科技創辦之一鄧強生學長1985年交大計算機工程研究所畢業。鄧學長是一位經歷豐富的創業者，從小公寓創業到成為專業經理人，本期刊很榮幸有機會專訪鄧強生學長，分享他精彩的人生經驗。
Relax the chaos-model-based human behavior by electrical stimulation therapy design
(2017-02)
Tsai, Zhi-Ren
;
Chang, Yau-Zen
;
Zhang, Han-Wei
;
Lin, Chin-Teng
;
資訊工程學系
The brain\'s electrical activity is chaotic and unpredictable yet has a hidden order that is attracted to a certain region. There are numerous fractal strange attractors in the brain that change as thinking processes vary. Further, the thinking processes change the human behaviors, especially in schizophrenia or internet addiction. The proposed chaos modelling and control theory may offer useful and relevant information on electrical stimulation therapy design to change this thinking processes through stimulating the brain\'s electrical activities. The experimental result of relaxing body from a lots of electrotherapy clinics helps mental disorders relax the thinking chaos in mind to replace their chaotic behaviors from the brain\'s electrical activities. This paper tries to explain the above claim in the aspect of the electrotherapy and control theory to suggest the control signal of electrotherapy based on an assumption for chaos model of patient and its control signals design according to multiple stabilization solutions. In the future, the electrical stimulation therapy will be proof in the Raphael Humanistic Clinic or the other electrotherapy clinics. (C) 2016 Elsevier Ltd. All rights reserved.