Browsing by Issue Date, starting with "2016-03"

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A Rapid Fatigue Test Method on Micro Structures for High-Cycle Fatigue
(2016-03)
Shieh, Yi-Chueh
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Lin, Hsuan-Yu
;
Hsu, Wensyang
;
Lin, Yu-Hsin
;
機械工程學系
Here, a rapid fatigue test method for micro structure is proposed, where the test sample is excited at its resonant frequency by an external actuator. Due to the scaling effect, a micro cantilever beam has high resonant frequency, so the testing time can be greatly reduced. In addition, no complicated built-in micro actuator is needed; therefore, it is easy to fabricate the test sample. Single-crystal silicon (SCS) beams are fabricated to demonstrate the proposed method here with two types of beams. A notch is designed near the fixed end to have stress concentration effect. The input voltage of the piezoelectric patch is adjusted to excite the cantilever beams at its resonant frequency to have different amplitudes to find the corresponding fatigue life, where a laser Doppler vibrometer is used to monitor displacements of the cantilever beam to control the stress amplitude. Then, the stress-life (S/N) curve of the silicon beam can be obtained. It is found that the fatigue limit of the SCS beam is about 1.33 GPa, and it takes only about 5.2 h to test 1.35 x 10(9) cycles at a resonant frequency of 72 kHz. Comparing with previous fatigue test methods with an external probe, testing 10(9) cycles at a frequency of 20 Hz will need 1.58 years, which indicates that the proposed rapid fatigue test method is particularly suitable for high-cycle fatigue test of micro structure.
六角柱體微型感測探針及其製法
(2016-03-01)
鄭裕庭
;
陳益祥
;
李元鼎
;
王覺瑋
本發明為一種六角柱體微型感測探針及其製法，係由一片金屬基電阻式溫度感測探針以及氧化銥/氯化銀酸鹼值感測探針覆合壓焊而成，可同時感測溫度及酸鹼值。此外，此微型感測探針之應力測試可達到3牛頓壓應力，可輕易地穿刺人體和動物的心肌或肌肉組織，故可應用於監測心肌狀態或感測肉類食品的新鮮度。
Suppressing Non-Uniform Tunneling in InAs/GaSb TFET With Dual-Metal Gate
(2016-03-01)
Hsu, Ching-Yi
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Chang, Chun-Yen
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Chang, Edward Yi
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Hu, Chenming
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材料科學與工程學系
Non-uniformity in electric field causes early onset of tunneling near the edge of InAs/GaSb hetero-junction tunneling field-effect transistors. When a small area, often an edge, of the tunneling junction has a lower turn-on voltage, the steep switching characteristic is degraded. Fermi pinning at InAs surface greatly worsen the uniformity. We propose a dual-metal gate structure to address the non-uniformity issue. With proper choice of work functions, the dual-metal gate structure can effectively suppress the early onset of edge tunneling and significantly improve the subthreshold swing.
Bipolar Conduction in Tin-Oxide Semiconductor Channel Treated by Oxygen Plasma for Low-Power Thin-Film Transistor Application
(2016-03)
Chen, Po-Chun
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Wu, Yung-Hsien
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Zheng, Zhi-Wei
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Chiu, Yu-Chien
;
Cheng, Chun-Hu
In this paper, we investigated the bipolar conduction mechanism in thin-film transistors (TFTs) with oxygen plasma treatment on tin-oxide channel. The optimized p-type thin-oxide TFTs showed an on/off ratio of >10(4), a threshold voltage of -1.05 V, and a field-effect mobility of 2.14 cm(2).V-1.s(-1). By increasing the exposure time of oxygen plasma, excess oxygen was incorporated to thin-oxide channel and converted thin monoxide to oxygen-rich n-type thin dioxide, which in turn led to n-type operation. It indicated that oxygen plasma was the critical factor to determine oxygen concentration, oxygen vacancies, metal ions and channel polarity. This proposed oxygen-content tuning through plasma treatment approach shows great promise in simplification of TFT process that can achieve n-type and p-type TFTs under the same device process.
WIRELESS NEAR-INFRARED SPECTROSCOPE TO REAL-TIME QUANTITATIVELY ASSESS DORSAL FOOT PERIPHERAL CIRCULATION IN PATIENTS WITH DIABETES FOOT ULCER: A PILOT STUDY
(2016-03)
Lin, Yen Pin
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Chang, Chang Cheng
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Su, Zeng Wei
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Chang, Yin-Shuo
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Lin, Borshyh
Face-Based Heart Rate Signal Decomposition and Evaluation Using Multiple Linear Regression
(2016-03-01)
Lin, Kuan-Yi
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Chen, Duan-Yu
;
Tsai, Wen-Jiin
;
資訊工程學系
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Department of Computer Science
Contact measurements of the cardiac pulse using the conventional electrocardiogram equipment requires patients to wear adhesive gel patches or chest straps that can cause skin irritation and discomfort. Commercially available pulse oximetry sensors that attach to the fingertips or earlobes also cause inconvenience for patients and the spring-loaded clips can be painful to use. Therefore, a novel robust non-contact technique is developed for the evaluation of heart rate variation. According to the periodic variation of reflectance strength resulting from changes to hemoglobin absorptivity across the visible light spectrum as heartbeats cause changes to blood volume in the blood vessels in the face, a reflectance signal is decomposed from consecutive frames of the green channel of the facial region. Furthermore, ensemble empirical mode decomposition of the Hilbert-Huang transform (HHT) is used to acquire the primary heart rate signal while reducing the effect of ambient light changes. The effective instantaneous frequencies from intrinsic mode functions decomposed by HHT are implemented by the multiple-linear regression model to evaluate heart rates before the frequencies were rectified by maximum likelihood method assuming Poisson distribution, and the minimum elapse time for heart rate evaluation is also evaluated in the estimate process. Experimental results show that our proposed approach provides a convenient non-contact method to evaluate heart rate and outperforms the current state-of-the-art method with higher accuracy and smaller variance.
The Intellectual Structure of Metacognitive Scaffolding in Science Education: A Co-citation Network Analysis
(2016-03)
Tang, Kai-Yu
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Wang, Chia-Yu
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Chang, Hsin-Yi
;
Chen, Sufen
;
Lo, Hao-Chang
The issues of metacognitive scaffolding in science education (MSiSE) have become increasingly popular and important. Differing from previous content reviews, this study proposes a series of quantitative computer-based analyses by integrating document co-citation analysis, social network analysis, and exploratory factor analysis to explore the intellectual structure of the MSiSE literature (i.e. the relationships within and between subfields of MSiSE). Co-citation refers to any two articles that are jointly referenced in other articles. After the computation of co-citation analysis, 27 articles that have been co-cited at least once by follow-up studies as references were identified as the final set of core articles. The whole co-citation profile of 27 cores with the 434 links was then visualized in a network through social network analysis, representing an overview for the intellectual structure of core MSiSE studies. The most cross-referenced underpinnings in the network focused on adaptive scaffolding for self-regulated learning to enhance students\' conceptual understanding and on younger students\' metacognition in online science inquiry learning environments. Furthermore, two emerging topics in the network were identified through an exploratory factor analysis as "non-technological metacognitive scaffolding media," and "behavior patterns & task analysis in technology-infused environments." Overall, the study provides an innovative review method of scholarly communication in the MSiSE literature.
Combining multiple correspondence analysis with association rule mining to conduct user-driven product design of wearable devices
(2016-03)
Wang, Chih-Hsuan
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Nien, Su-Hau
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工業工程與管理學系
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Department of Industrial Engineering and Management
In recent years, the popularity of smart phones has boomed the emergence of wearable devices like wristband, smart watch, and sport watch since these devices are portable to record human body information, synchronize information with smart phones, and conduct real-time monitoring of physical condition. However, a recent survey indicates that near 70% respondents are not interested in buying Apple\'s new iWatch although the marketplace is full of competing alternatives like Samsung\'s Gear fit, LG\'s G watch, and Sony\'s SW3. In this study, a novel framework combining multiple correspondence analysis (MCA), association rule mining (ARM), with K nearest neighbor (KNN) is proposed to help brand companies address the following issues: (1) using MCA to explore the latent relationships between users\' demographic profiles, user perceptions of design attributes, and user preferences for wearable devices, (2) using ARM to identify key design attributes that can best configure a specific alternative to achieve effective product differentiation (positioning), (3) using KNN to accomplish efficient product selection (recommendation). More importantly, hundreds of consumers are surveyed to justify the validity of the presented framework. (C) 2015 Elsevier B.V. All rights reserved.
Epileptic Pattern Recognition and Discovery of the Local Field Potential in Amygdala Kindling Process
(2016-03)
Wang, Yu-Lin
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Chen, Yin-Lin
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Su, Alvin Wen-Yu
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Shaw, Fu-Zen
;
Liang, Sheng-Fu
Epileptogenesis, which occurs in an epileptic brain, is an important focus for epilepsy. The spectral analysis has been popularly applied to study the electrophysiological activities. However, the resolution is dominated by the window function of the algorithm used and the sample size. In this report, a temporal waveform analysis method is proposed to investigate the relationship of electrophysiological discharges and motor outcomes with a kindling process. Wistar rats were subjected to electrical amygdala kindling to induce temporal lobe epilepsy. During the kindling process, different morphologies of afterdischarges (ADs) were found and a recognition method, using template matching techniques combined with morphological comparators, was developed to automatically detect the epileptic patterns. The recognition results were compared to manually labeled results, and 79%-91% sensitivity was found. In addition, the initial ADs (the first 10 s) of different seizure stages were specifically utilized for recognition, and an average of 85% sensitivity was achieved. Our study provides an alternative viewpoint away from frequency analysis and time-frequency analysis to investigate epileptogenesis in an epileptic brain. The recognition method can be utilized as a preliminary inspection tool to identify remarkable changes in a patient\'s electrophysiological activities for clinical use. Moreover, we demonstrate the feasibility of predicting behavioral seizure stages from the early epileptiform discharges.
Three-Element Item Selection Procedures for Multiple Forms Assembly: An Item Matching Approach
(2016-03)
Chen, Pei-Hua
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交大名義發表
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管理科學系
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National Chiao Tung University
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Department of Management Science
In educational measurement, building multiple alternate test forms is usually highly desirable in practice. Test assembly problems are classified as NP-hard (Non-deterministic Polynomial-time hard) problems, and their computation time increases exponentially as the problem size grows. The purpose of this study was to construct parallel forms item-by-item based on a seed test, using two proposed item selection heuristic methods (random item sequence assigned to maximum distance form with content balance [R-MD-B] and random item sequence assigned to random form with content balancing [R-R-B]) incorporating a flexible content balancing method. The results were compared with two modified versions of the Armstrong, Jones, and Wu heuristics (random item sequence assigned to maximum distance form with Armstrong\'s replacement [R-MD-R] and random item sequence assigned to random form with Armstrong\'s replacement [R-R-R]) and two models incorporating mixed integer programming (MIP) methods. The results showed that the R-MD-B and R-R-B methods yielded results comparable with the two MIP methods with less computation time in terms of the item information functions, test characteristic curves, and content coverage. The results also showed that R-MD-B and R-R-B can be extended to handle test assembly constraints in practical settings.
納中華入臺灣的1949創傷癥候，與發明新臺灣的可能：讀《1949禮讚》
(國立陽明交通大學出版社, 2016-03-01)
顏訥
110 GHz hybrid mode-locked fiber laser with enhanced extinction ratio based on nonlinear silicon-on-insulator micro-ring-resonator (SOI MRR)
(2016-03)
Liu, Yang
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Hsu, Yung
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Chow, Chi-Wai
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Yang, Ling-Gang
;
Yeh, Chien-Hung
We propose and experimentally demonstrate a new 110 GHz high-repetition-rate hybrid mode-locked fiber laser using a silicon-on-insulator microring-resonator (SOI MRR) acting as the optical nonlinear element and optical comb filter simultaneously. By incorporating a phase modulator (PM) that is electrically driven at a fraction of the harmonic frequency, an enhanced extinction ratio (ER) of the optical pulses can be produced. The ER of the optical pulse train increases from 3 dB to 10 dB. As the PM is only electrically driven by the signal at a fraction of the harmonic frequency, in this case 22 GHz (110 GHz/5 GHz), a low bandwidth PM and driving circuit can be used. The mode-locked pulse width and the 3 dB spectral bandwidth of the proposed mode-locked fiber laser are measured, showing that the optical pulses are nearly transform limited. Moreover, stability evaluation for an hour is performed, showing that the proposed laser can achieve stable mode-locking without the need for optical feedback or any other stabilization mechanism.
A Visual Attention Monitor Based on Steady-State Visual Evoked Potential
(2016-03)
Lee, Yi-Chieh
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Lin, Wen-Chieh
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Cherng, Fu-Yin
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Ko, Li-Wei
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生物科技學系
Attention detection is important for many applications. Automatic determination of users\' visual attention state is challenging because attention involves numerous complex and internal human cognitive functions. Behavioral observations, such as eye gaze or response to external stimuli, can provide clues for users\' visual attention state; however, users\' cognitive state cannot be easily known. Conventional electroencephalography-based methods detect attention by observing the dynamic changes in the frontal lobe of the brain, especially in the anterior cingulate cortex (ACC). However, that area in the brain is associated with many functions, some of which correlate with conscious experience but are not directly related to attention. In this paper, we design an attention monitoring system to detect whether the brain experiences a visual stimulus consciously. Our experiments verified the feasibility of our design, and the average classification rate ranged from 72% to 82%.
Polarity Alteration of a Calcium Site Induces a Hydrophobic Interaction Network and Enhances Cel9A Endoglucanase Thermostability
(2016-03)
Wang, Hsiu-Jung
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Hsiao, Yu-Yuan
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Chen, Yu-Pei
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Ma, Tien-Yang
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Tseng, Ching-Ping
Structural calcium sites control protein thermostability and activity by stabilizing native folds and changing local conformations. Alicyclobacillus acidocaldarius survives in thermal-acidic conditions and produces an endoglucanase Cel9A (AaCel9A) which contains a calcium-binding site (Ser465 to Val470) near the catalytic cleft. By superimposing the Ca2+ -free and Ca2+ bounded conformations of the calcium site, we found that Ca2+ induces hydrophobic interactions between the calcium site and its nearby region by driving a conformational change. The hydrophobic interactions at the high-B-factor region could be enhanced further by replacing the surrounding polar residues with hydrophobic residues to affect enzyme thermostability and activity. Therefore, the calcium-binding residue Asp468 (whose side chain directly ligates Ca2+), Asp469, and Asp471 of AaCel9A were separately replaced by alanine and valine. Mutants D468A and D468V showed increased activity compared with those of the wild type with 0 mMor 10 mM Ca2+ added, whereas the Asp469 or Asp471 substitution resulted in decreased activity. The D468A crystal structure revealed that mutation D468A triggered a conformational change similar to that induced by Ca2+ in the wild type and developed a hydrophobic interaction network between the calcium site and the neighboring hydrophobic region (Ala113 to Ala117). Mutations D468V and D468A increased 4.5 degrees C and 5.9 degrees C, respectively, in melting temperature, and enzyme half-life at 75 degrees C increased approximately 13 times. Structural comparisons between AaCel9A and other endoglucanases of the GH9 family suggested that the stability of the regions corresponding to the AaCel9A calcium site plays an important role in GH9 endoglucanase catalysis at high temperature.
導論：該禮讚或詛咒－《1949禮讚》的反思
(國立陽明交通大學出版社, 2016-03-01)
楊儒賓
EEG Alpha and Gamma Modulators Mediate Motion Sickness-Related Spectral Responses
(2016-03)
Chuang, Shang-Wen
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Chuang, Chun-Hsiang
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Yu, Yi-Hsin
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King, Jung-Tai
;
Lin, Chin-Teng
Motion sickness (MS) is a common experience of travelers. To provide insights into brain dynamics associated with MS, this study recruited 19 subjects to participate in an electroencephalogram (EEG) experiment in a virtual-reality driving environment. When riding on consecutive winding roads, subjects experienced postural instability and sensory conflict between visual and vestibular stimuli. Meanwhile, subjects rated their level of MS on a six-point scale. Independent component analysis (ICA) was used to separate the filtered EEG signals into maximally temporally independent components (ICs). Then, reduced logarithmic spectra of ICs of interest, using principal component analysis, were decomposed by ICA again to find spectrally fixed and temporally independent modulators (IMs). Results demonstrated that a higher degree of MS accompanied increased activation of alpha (r = 0.421) and gamma (r = 0.478) IMs across remote-independent brain processes, covering motor, parietal and occipital areas. This co-modulatory spectral change in alpha and gamma bands revealed the neurophysiological demand to regulate conflicts among multi-modal sensory systems during MS.
脫歐狂想
(國立陽明交通大學出版社, 2016-03-01)
朱元鴻
An Attachable Electromagnetic Energy Harvester Driven Wireless Sensing System Demonstrating Milling-Processes and Cutter-Wear/Breakage-Condition Monitoring
(2016-03-01)
Chung, Tien-Kan
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Yeh, Po-Chen
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Lee, Hao
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Lin, Cheng-Mao
;
Tseng, Chia-Yung
An attachable electromagnetic-energy-harvester driven wireless vibration-sensing system for monitoring milling-processes and cutter-wear/breakage-conditions is demonstrated. The system includes an electromagnetic energy harvester, three single-axis Micro Electro-Mechanical Systems (MEMS) accelerometers, a wireless chip module, and corresponding circuits. The harvester consisting of magnets with a coil uses electromagnetic induction to harness mechanical energy produced by the rotating spindle in milling processes and consequently convert the harnessed energy to electrical output. The electrical output is rectified by the rectification circuit to power the accelerometers and wireless chip module. The harvester, circuits, accelerometer, and wireless chip are integrated as an energy-harvester driven wireless vibration-sensing system. Therefore, this completes a self-powered wireless vibration sensing system. For system testing, a numerical-controlled machining tool with various milling processes is used. According to the test results, the system is fully self-powered and able to successfully sense vibration in the milling processes. Furthermore, by analyzing the vibration signals (i.e., through analyzing the electrical outputs of the accelerometers), criteria are successfully established for the system for real-time accurate simulations of the milling-processes and cutter-conditions (such as cutter-wear conditions and cutter-breaking occurrence). Due to these results, our approach can be applied to most milling and other machining machines in factories to realize more smart machining technologies.
Vortex in Holographic Two-band Superconductor
(2016-03)
Wu, Shang-Yu
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電機學院
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College of Electrical and Computer Engineering
A single static vortex in a holographic two-band superconductor is constructed. We investigate the effect of the interband coupling to the condensate profile. We estimate the first critical magnetic field, and compute characteristic lengths like penetration and coherence lengths and conclude both bands in our superconductor behave type II.
另一個歐洲是可能的嗎？從2015希臘歐債危機檢視歐洲作為一個整體的困境
(國立陽明交通大學出版社, 2016-03-01)
蕭伶伃