Browsing by Issue Date, starting with "2018-11-28"

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Infrared spectra of the 1,1-dimethylallyl and 1,2-dimethylallyl radicals isolated in solid para-hydrogen
(2018-11-28)
Amicangelo, Jay C.
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Lee, Yuan-Pern
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交大名義發表
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應用化學系
;
應用化學系分子科學碩博班
The reaction of hydrogen atoms (H) with isoprene (C5H8) in solid para-hydrogen (p-H2) matrices at 3.2 K has been studied using infrared (IR) spectroscopy. Mixtures of C5H8 and Cl-2 were co-deposited in p-H2 at 3.2 K, followed by irradiation with ultraviolet light at 365 nm to produce Cl atoms from the Cl-2, and subsequent irradiation with IR light to produce H atoms from the reaction of the Cl atoms with p-H-2. The H atoms then react with the C5H8 to form H atom addition radicals (C5H9 center dot). Upon 365-nm/IR photolysis, a multitude of new lines appeared in the IR spectrum and, based on the secondary photolysis behavior, it was determined that the majority of the new lines belong to two distinct chemical species, denoted as setX(an intense line at 776.0 cm 1 and 12 other weaker lines) and set Y (an intense line at 766.7 cm(-1) and 12 other weaker lines). Quantum-chemical calculations were performed at the B3PW91/6-311++ G(2d, 2p) level to determine the relative energetics and predict the IR spectra for the four possible isomers of C5H9 center dot that can be produced from the addition of the H atom to the four distinct carbon atoms in C5H8. The newly observed lines of set X and Y are assigned to the 1,2-dimethylallyl (addition to carbon 4) and the 1,1-dimethylallyl (addition to carbon 1) radicals according to comparison with the predicted IR spectra of the possible products. The 1,2-dimethylallyl radical and the 1,1-dimethylallyl radical were predicted to be the most stable isomers, with the latter similar to 8 kJ mol(-1) lower in energy than the former and to have significantly lower barriers than the addition pathways for the two central carbons. The ratio of the 1,1-dimethylallyl to the 1,2-dimethylallyl radicals is estimated to be (1.0 +/- 0.5): 1.0, indicating that the two radicals are produced in similar amounts, which is consistent with the theoretical predictions that the barrier heights are very similar for the H atom addition to the two terminal carbon atoms. Published by AIP Publishing.
Reversible Photocurrent Switching in Ionic and Superionic Conductors of Polycrystalline Silver Iodide
(2018-11-29)
Sabeth, Farzana
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Khaton, Rahima
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Islam, Md. Serajul
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Iimori, Toshifumi
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Ohta, Nobuhiro
Photocurrent switching effect plays vital roles in a number of optoelectronic devices especially for the construction of various logic gates. In the conventional photocurrent switching materials, electrons and holes are the charge carriers. Here we propose that the ionic and superionic photocurrent in some polymorphs of silver iodide is also switchable. We observed that the polarity of photocurrent in the polycrystalline gamma-AgI is positive when an area near the negative electrode is irradiated with visible light and photocurrent switched to negative values while area near the positive electrode is photoirradiated. Polycrystalline alpha-AgI derived from gamma-AgI also shows the photocurrent switching effect, depending on the photoirradiation position. Such a complete polarity switching phenomenon was not obtained in polycrystalline beta-AgI as well as the alpha-AgI derived from beta-AgI. Usually, the polarity of the photocurrent is changed by reversing photoelectrode potential or by using light of different wavelengths or intensities. This study introduces a rather simple way to control the photocurrent switching by changing the position of irradiation of light of constant wavelength and intensity.
The influence on electrical characteristics of amorphous indium tungsten oxide thin film transistors with multi-stacked active layer structure
(2018-11-30)
Ruan, Dun-Bao
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Liu, Po-Tsun
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Gan, Kai-Jhih
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Chiu, Yu-Chuan
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Yu, Min-Chin
In order to effectively enhance the carrier mobility and device stability, simultaneously, a multi-stacked active layer of thin film transistor with a novel type of channel material, amorphous indium-tungsten-oxide, is proposed in this work. Atop-cappingoxygen-rich indium-tungsten-zinc-oxide thin film is used for suppressing the influence of the molecular adsorption or desorption from the ambient at the back channel in the gate bias stress test. In addition, a bottom-bufferingoxygen-rich indium-tungsten-zinc-oxide thin film is deposited to avoid the oxygen vacancy generation during the following thermal process. On the other hand, a 1-nm thick WO3 film is inserted between the high-k gate insulator and active layer, which play important roles as interfacial layer for improving the interface quality and keeping the stability of front channel film. Besides, an HfO2 dielectric film is chosen as gate insulator for realizing the low-voltage operation. As a result, the novel tungsten doped channel material with both-sideoxygen-rich active layer exhibits a high I-ON/I-OFF current ratio of similar to 6x10(7) for low gate leakage current, attributing to the Atop-cappingoxygen-rich thin film. Then, a high field-effect mobility of similar to 27.9cm(2)/V.s and a low sub-threshold swing of 0.079 V/decade are achieved by the good interface quality. This structure with both-sideoxygen-rich active layer exhibits its potential application for the future high-resolution and large-size display manufacture.
Kinetic study of continuous liquid-liquid extraction of wine with real-time detection
(2018-11-30)
Yang, Hui-Hsien
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Dutkiewicz, Ewelina P.
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Urban, Pawel L.
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應用化學系
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Department of Applied Chemistry
Kinetic optimization of continuous liquid-liquid extraction (CLLE) can shorten sample preparation times and reduce losses of labile or volatile analytes. Here, we coupled a downscaled CLLE apparatus with atmospheric pressure chemical ionization interface of triple quadrupole mass spectrometer. Real-time sampling was guided by an Arduino-based programmable logic controller. The recorded datasets were processed to compute the extraction rate constants for the target analytes. The extraction time in subsequent on-line experiments was set to 180 min as a compromise between the reduction of the analysis time and maximizing its yield. Interestingly, off-line analysis of the extract produced different results than on-line analysis pointing to the immanent degradation of the collected extract aliquots. Next, we implemented this hyphenated system in the analysis of red wine samples, which were stored during different periods of time after opening the bottle. The results reveal differences in the depletion of the volatile wine components during storage. (C) 2018 Elsevier B.V. All rights reserved.
AlGaN/GaN MIS-HEMTs With High Quality ALD-Al2O3 Gate Dielectric Using Water and Remote Oxygen Plasma As Oxidants
(2018-12-01)
Wang, Huan-Chung
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Hsieh, Ting-En
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Lin, Yueh-Chin
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Luc, Quang Ho
;
Liu, Shih-Chien
We demonstrate the electrical performances of AlGaN/GaN metal-insulator-semiconductor-high electron mobility transistors (MIS-HEMTs) with high quality Al2O3 gate dielectric deposited by plasma enhanced atomic layer deposition using both H2O and remote O-2 plasma as oxygen sources. Excellent gate-dielectric/GaN interface and Al2O3 film quality were obtained, resulting in a very small threshold voltage hysteresis and a low interface trap density. The MIS-HEMT device exhibited high on/off current ratio of similar to 10(10), steep subthreshold slope, small gate leakage current, low dynamic on-resistance degradation, and effectively current collapse suppression. These results indicate that incorporating remote O-2 plasma in the ALD-Al2O3 deposition process is an effective and simple way to provide high quality gate dielectric for the GaN MIS-HEMTs production.
對談洪凌－正義與法理的無血／邪大戮：從Title IX與#MeToo叩問後冷戰政治無意識
(深河出版有限公司, 2018-12-01)
劉璧嘉
;
郭佳
重返「醫師無產階級化」：理論概念與台灣經驗
(深河出版有限公司, 2018-12-01)
陳宗延
Investigating the impacts of guanxi and relationship marketing in port logistics: two cases
(2018-12-01)
Chen, Mu-Chen
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Chang, Kuo-Chien
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Hsu, Chia-Lin
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De Leon, German Alcibiades Vega
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運輸與物流管理系註：原交通所+運管所
This study explores the differential impacts of guanxi and relationship marketing, both at the interpersonal and interorganisational level, within the port logistics industry. We compare the effects of these two marketing approaches on outcome variables to elucidate managerial implications for logistics firms conducting cross-cultural business. The PLS-SEM method is used to analyse data from a survey of logistics companies in Taiwan and Panama. In both countries, interpersonal relationships engender significant effects on interorganisational relationships, and firm performance has significant effects on firm loyalty. As regards the determinants of supply-chain effectiveness and firm performance, we show that interpersonal relationships play a more important role in Taiwan, while interorganisational relationships have more weight in Panama. In other words, Asian companies focus on guanxi marketing at the personal level, while Latin American ones focus on relationship marketing at the interorganisational level. These findings and consequent knowledge can help companies conducting business in Asia and Latin America to adapt to counterpart's cultural business practices.
出走，探索不一樣的人生－芬蘭交換學習心得
(國立陽明大學, 2018-12)
陳亭安
In Celebration of Professor Wen-Hwa Chen's 70th Birthday
(2018-12-01)
Chen, Cha'o-Kuang
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Lin, Zone-Ching
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Chieng, Wei-Hua
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機械工程學系
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Department of Mechanical Engineering
Direct C-H Arylation Polymerization to form Anionic Water-Soluble Poly(3,4-ethylenedioxythiophenes) with Higher Yields and Molecular Weights
(2018-12-01)
Ayalew, Hailemichael
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Wang, Tian-lin
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Wang, Tsai-Hui
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Hsu, Hsiu-Fu
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Yu, Hsiao-hua
A facile and environmentally benign Pd-catalyzed direct C-H arylation polymerization (DAP) has been developed for the syntheses of homo-and copolymers of anionic-group-functionalized 3,4-ethylenedioxythiophenes with high yields (up to 99%), high molecular weights, and narrow polydispersities. The effects of various Pd catalysts, phosphine ligands, and additives on the properties of the polymers have been examined. The method gives anionic poly(3,4-ethylenedioxythiophenes) with higher molecular weights than those produced by the previously reported chemical or electrochemical methods. The method was also used to synthesize polymers functionalized with carboxylic acid groups without the need for protection/ deprotection steps. The resulting polymers can be processed from water or highly polar organic solvents. We also demonstrated a phosphine-free, water-mediated, Pdcatalyzed DAP. The anionic poly(3,4-ethylenedioxythiophenes) were stable in water, and are promising for applications in sensors, drug delivery, and cell engineering.
Multilabeled Value Networks for Computer Go
(2018-12-01)
Wu, Ti-Rong
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Wu, I-Chen
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Chen, Guan-Wun
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Wei, Ting-Han
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Wu, Hung-Chun
This paper proposes a new approach to a novel value network architecture for the game Go, called a multilabeled (ML) value network. In the ML value network, different values (win rates) are trained simultaneously for different settings of komi, a compensation given to balance the initiative of playing first. The ML value network has three advantages: 1) it outputs values for different komi; (2) it supports dynamic komi; and (3) it lowers the mean squared error (MSE). This paper also proposes a new dynamic komi method to improve game-playing strength. This paper also performs experiments to demonstrate the merits of the architecture. First, the MSE of the ML value network is generally lower than the value network alone. Second, the program based on the ML value network wins by a rate of 67.6% against the program based on the value network alone. Third, the program with the proposed dynamic komi method significantly improves the playing strength over the baseline that does not use dynamic komi, especially for handicap games. To our knowledge, up to date, no handicap games have been played openly by programs using value networks. This paper provides these programs with a useful approach to playing handicap games.
在市場中實踐「西藏意識」：印度、尼泊爾流亡藏人的難民經濟
(國立陽明交通大學出版社, 2018-12-01)
潘美玲
在全球化的跨國移工或經濟移民的現象中，本文探討的是非自願移民的難民群體的生存策略與經濟運作機制。主要針對流亡藏人社群，因為其難民的狀態，同時擔負著維繫西藏的文化使命，而發展出來的「西藏意識」（Tibetanness），從政治認同的面向拓展到市場上的經濟實踐，從而影響其生存策略與經濟活動的實踐。透過流亡藏人在印度的冬季毛衣貿易業，以及在尼泊爾發展的西藏地毯產業，以多點民族誌與比較分析策略，檢視流亡藏人如何在這兩個產業市場當中實踐其「西藏意識」，從而構成西藏難民的經濟特色。這種西藏特色有助於市場差異化策略的進行，但也構成了產業發展的限制。印證了博蘭尼所指出市場鑲嵌在社會之中的運作，尤其流亡藏人社會的發展要務，在於為西藏的家園尋求正義，並以維持認同與文化傳統為優先，因此經濟的目的在於維生，是完成西藏志業的工具，從而對於資本主義式的財富積累和壟斷式的擴張，產生了節制的力量，維繫了藏人在流亡處境下族群團結的基礎。
桌球競賽暫停策略之分析
(國立交通大學體育室, 2018-12-01)
王鈞逸
;
Chun-Yi Wang
目的：運動競賽中暫停之申請為一決策行為，本研究旨在瞭解頂尖教練及選手申請暫停的時機，並探討暫停後之效益。方法：以2016年世界桌球錦標賽(World Table Tennis Championship, WTTC)男子團體賽八強選手作為研究對象，並以影片回顧之方式，蒐集半準決賽至決賽之暫停資料，所得數據以描述性統計建立基本資料，並以卡方適合度檢定分析暫停時機其次數之分佈情形。結果：暫停的使用率為83%，暫停局次以第3局的比率最高，局段以中局最多，比分情境最多為連續輸2-3分，暫停後的球權歸屬差異不明顯，領先時申請暫停的比率低於落後時，而暫停後1-4分的勝率約為50%。結論：現今桌球競賽十分重視暫停之申請並徹底執行，且暫停時機有提早之趨勢。而無論領先或落後時申請暫停，均具有正向效益。
Development of Limited-Angle Iterative Reconstruction Algorithms with Context Encoder-Based Sinogram Completion for Micro-CT Applications
(2018-12-01)
Jin, Shih-Chun
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Hsieh, Chia-Jui
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Chen, Jyh-Cheng
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Tu, Shih-Huan
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Chen, Ya-Chen
Limited-angle iterative reconstruction (LAIR) reduces the radiation dose required for computed tomography (CT) imaging by decreasing the range of the projection angle. We developed an image-quality-based stopping-criteria method with a flexible and innovative instrument design that, when combined with LAIR, provides the image quality of a conventional CT system. This study describes the construction of different scan acquisition protocols for micro-CT system applications. Fully-sampled Feldkamp (FDK)-reconstructed images were used as references for comparison to assess the image quality produced by these tested protocols. The insufficient portions of a sinogram were inpainted by applying a context encoder (CE), a type of generative adversarial network, to the LAIR process. The context image was passed through an encoder to identify features that were connected to the decoder using a channel-wise fully-connected layer. Our results evidence the excellent performance of this novel approach. Even when we reduce the radiation dose by 1/4, the iterative-based LAIR improved the full-width half-maximum, contrast-to-noise and signal-to-noise ratios by 20% to 40% compared to a fully-sampled FDK-based reconstruction. Our data support that this CE-based sinogram completion method enhances the efficacy and efficiency of LAIR and that would allow feasibility of limited angle reconstruction.
A fast and low idle time method for mining frequent patterns in distributed and many-task computing environments
(2018-12-01)
Lin, Chun-Cheng
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Chung, Sheng-Hao
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Chen, Ju-Chin
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Yu, Yuan-Tse
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Lin, Kawuu W.
Association rules mining has attracted much attention among data mining topics because it has been successfully applied in various fields to find the association between purchased items by identifying frequent patterns (FPs). Currently, databases are huge, ranging in size from terabytes to petabytes. Although past studies can effectively discover FPs to deduce association rules, the execution efficiency is still a critical problem, particularly for big data. Progressive size working set (PSWS) and parallel FP-growth (PFP) are state-of-the-art methods that have been applied successfully to parallel and distributed computing technology to improve mining processing time in many-task computing, thereby bridging the gap between high-throughput and high-performance computing. However, such methods cannot mine before obtaining a complete FP-tree or the corresponding subdatabase, causing a high idle time for computing nodes. We propose a method that can begin mining when a small part of an FP-tree is received. The idle time of computing nodes can be reduced, and thus, the time required for mining can be reduced effectively. Through an empirical evaluation, the proposed method is shown to be faster than PSWS and PFP.
Applications of neural network models for structural health monitoring based on derived modal properties
(2018-12-01)
Chang, Chia-Ming
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Lin, Tzu-Kang
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Chang, Chih-Wei
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土木工程學系
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Department of Civil Engineering
Structural health monitoring is required to interpret damaged structures in terms of locations and severity, even remaining performance of the damaged members. Therefore, this study proposes a new artificial intelligence-based structural health monitoring strategy based on neural network modeling. A neural network model is developed in accordance with a numerical model which is derived from the identified modal properties under ambient vibrations. The stochastic subspace system identification is first implemented to derive the natural frequencies and mode shapes of a healthy structure. These natural frequencies and mode shapes are then employed to derive a simplified model of this structure, allowing changing stiffness terms to construct various damage patterns. A neural network model is trained and built by the modal properties of the structure with these damage patterns. After a critical event occurs (e.g., earthquakes), this neural network model can be employed to estimate the damage patterns in terms of stiffness reduction. In this study, a numerical example consisting of two damage scenarios is carried out. This example studies a seven-story building with a single and multiple damaged columns in order to evaluate performance of the proposed structural health monitoring strategy. Moreover, the proposed structural health monitoring strategy is also applied to an experimental test of a scaled twin-tower building with weak braces in some floors. Partially modal properties of the structure are obtained from the stochastic subspace system identification, while a simplified model is developed in accordance to the identified modal properties of the healthy building. Then, a neural network model is established based on this simplified model. After seismic events, this neural network model is employed to carry damage detection of this building in terms of damage locations and levels. As a result, the proposed artificial intelligence-based structural health monitoring strategy is quite effective to locate damage if the identified modal properties are relatively accurate.
Three-dimensional device simulation of random telegraph noise spectroscopy with Coulomb energy variation of the trap in high-k gate oxide
(2018-12-01)
Lin, Po-Jui
;
Su, Chong-Zih
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Yao, Chih-Wei
;
Watanabe, Hiroshi
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電機工程學系
The random telegraph noise (RTN) time constants, capture (T-C) and emission (T-e) times, have been extensively used to identify the trap position in the gate oxide by comparing the measured T-C-over-T-e ratio with the Shockley-Read-Hall (SRH) statistics. However, various factors have been shown to affect the accuracy of the extracted trap depth from the SRH-type models, such as three-dimensional (3D) device electrostatics, atomistic doping, metal gate granularity, and Coulomb energy variation (CEV) of the trap. Focusing on CEV in this work, we assume the trap in gate oxide can be regarded as a floating island and then numerically studied the CEV of the trap with 3D drift-diffusion simulation. Analyzing the simulation data, the extracted trap depth without considering CEV in the SRH statistics are quantitatively compared with the data involved CEV. (C) 2018 The Japan Society of Applied Physics
Cause and countermeasures for the symmetric effect in borehole-to-surface electrical resistivity tomography
(2018-12-01)
Wang, Haoran
;
Lin, Chih-Ping
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交大名義發表
;
National Chiao Tung University
Researches and applications of borehole electrical resistivity tomography (BHERT) were mostly about cross-hole ERT (CHERT). Literatures on single borehole-to-surface ERT are limited, although this type of measurement could be useful when only one borehole is available. The undesirable symmetric effect is an important issue in the borehole-to-surface ERT survey. It has been observed that not only the pure in-hole data but also some borehole-to-surface configurations would induce mirrored images in the inversion model. In this study, all the possible borehole-to-surface configurations were classified and investigated for their sensitivity patterns and imaging resolutions, and the root cause of the symmetric effect was revealed to be the condition where one current pole and one potential pole coexist in the borehole. The configurations without symmetric effect suffer from low resolution. The investigation finally led to seeking a balance between resolution enhancement and symmetric effect reduction. Two countermeasures to suppress the symmetrical mirroring were proposed. The combined data inversion approach is based on the capability of each array to resist symmetric effect, while the weighted model stacking technique (WMOST) is derived from the characteristics of inversion models. Both methods were shown to be effective in suppressing the symmetric effect while maintaining sufficient resolution. (C) 2018 Elsevier B.V. All rights reserved.
Antitumor Effect of n-Butylidenephthalide Encapsulated on B16/F10 Melanoma Cells In Vitro with a Polycationic Liposome Containing PEI and Polyethylene Glycol Complex
(2018-12-01)
Gao, Hong-Wei
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Chang, Kai-Fu
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Huang, Xiao-Fan
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Lin, Yu-Ling
;
Weng, Jun-Cheng
Advanced melanoma can metastasize to distal organs from the skin and yield an aggressive disease and poor prognosis even after treatment with chemotherapeutic agents. The compound n-Butylidenephthalide (BP) is isolated from Angelica sinensis, which is used to treat anemia and gynecological dysfunction in traditional Chinese medicine. Studies have indicated that BP can inhibit cancers, including brain, lung, prostate, liver, and colon cancers. However, because BP is a natural hydrophobic compound, it is quickly metabolized by the liver within 24 h, and thus has limited potential for development in cancer therapy. This study investigated the anticancer mechanisms of BP through encapsulation with a novel polycationic liposome containing polyethylenimine (PEI) and polyethylene glycol complex (LPPC) in melanoma cells. The results demonstrated that BP/LPPC had higher cytotoxicity than BP alone and induced cell cycle arrest at the G(0)/G(1) phase in B16/F10 melanoma cells. The BP/LPPC-treated cell indicated an increase in subG(1) percentage and TUNEL positive apoptotic morphology through induction of extrinsic and intrinsic apoptosis pathways. The combination of BP and LPPC and clinical drug 5-Fluorouracil had a greater synergistic inhibition effect than did a single drug. Moreover, LPPC encapsulation improved the uptake of BP values through enhancement of cell endocytosis and maintained BP cytotoxicity activity within 24 h. In conclusion, BP/LPPC can inhibit growth of melanoma cells and induce cell arrest and apoptosis, indicating that BP/LPPC has great potential for development of melanoma therapy agents.