Browsing by Issue Date, starting with "2019-07-01"

Now showing 1 - 20 of 7322

Fabrication of magnetic liquid marbles using superhydrophobic atmospheric pressure plasma jet-formed fluorinated silica nanocomposites
(2019-07-01)
Wu, She-Ting
;
Weng, Chih-Chiang
;
Li, Bor-Ran
;
Hsu, Chain-Shu
;
交大名義發表
In this study, the surface properties of iron microparticles were modified for the manipulation of liquid droplets using atmospheric pressure plasma jets. These modified hydrophobic iron microparticles were prepared by synthesizing fluorinated silica nanocomposites on the surfaces of iron microparticles under atmospheric pressure plasma. The compositions of the silica nanocomposites were controlled by the deposition of hexamethyldisiloxane and fluoroalkylsilane precursors. The fluorinated silica nanocomposites were then used with iron microparticles to prepare magnetic liquid marbles. The contact angles of the iron microparticles and the fluorinated silica nanoparticle coating on the glass surface were both 154 degrees, which indicated that the surfaces of these particles were superhydrophobic. Higher hexamethyldisiloxane precursor flow rates produced more silica nanocomposites and resulted in greater roughness and larger contact angles. Changes in surface roughness were characterized by atomic force microscopy. X-ray photoelectron spectroscopy showed that C-F bonds were present on the modified glass surface. The presented approach allows rapid and highly efficient modification of uneven surfaces and can therefore be employed to render hydrophilic, superhydrophobic, and oleophilic surfaces. Moreover, the described hydrophobic iron microparticles can be used for the controlled magnetic manipulation of water droplets and oil-water separation.
Quantitative evaluation of grain boundary sliding and its dependence on orientation and temperature in pure Zn
(2019-07-01)
Gokhale, Aditya
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Sarvesha, R.
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Huang, E-Wen
;
Lee, Soo Yeol
;
Prasad, Rajesh
In the present work, grain boundary sliding (GBS) has been studied for the grains exhibiting different orientations (for indentation parallel and perpendicular to < c > axis) at different temperatures (RT to 200 degrees C) using nanoindentation in pure Zn. Electron back scattered diffraction was utilized to determine the orientation of the indented grains and identify the deformation mechanism, whereas atomic force microscopy was utilized to systematically quantify the GBS. Results indicated that indentation perpendicular to < c > axis exhibits slip induced GBS, whereas the indentation parallel to < c > axis results in pure GBS. The amount of GBS was also found to be strongly dependent upon the orientation of the neighboring grain. Further, the contribution from GBS towards total stain was found to increase with an increase in temperature. (C) 2019 Elsevier B.V. All rights reserved.
Analytical Noise Optimization of Single-/Dual-Band MOS LNAs With Substrate and Metal Loss Effects of Inductors
(2019-07-01)
Chang, Wei Ling
;
Meng, Chinchun
;
Ni, Jung-Hung
;
Ch, Kai-Chun
;
Chang, Chih-Kai
Analytical noise formulations and design optimization of single- and dual-band inductively source-degenerated MOS low-noise amplifiers (LNAs) with the substrate and metal loss effects of on-chip inductors are established in this paper. It reveals that the noise figures of both single-/dual-band LNAs degrade substantially under the consideration of the loss effects. However, by increasing the device size, the noise optimization methodology of simultaneous noise and input match for a single-band LNA still holds true with concern for the loss effects. For a dual-band LNA, analytical noise optimization for a balanced noise design is established for inductors with metal and substrate loss and indicates a larger device size. The substrate and metal loss effects of inductors can be mitigated using integrated passive device (IPD) process for the input match network. The demonstrated single-band 0.18-mu m MOS LNAs with and without IPD process show noise figures of 1.53 and 2.52 dB at 2.4 GHz, respectively. Subsequently, the implemented dual-band 0.18-mu m MOS LNAs with and without IPD process show noise figures of 1.6/2.6 and 3.25/4.1 dB at 2.4/5 GHz, respectively.
Special Issue on Pervasive Systems, Algorithms, and Networks Foreword
(2019-07-01)
Hsieh, Sun-Yuan
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Klasing, Ralf
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Luo, Chunbo
;
Tsai, Shi-Chun
;
資訊科學與工程研究所
Design of a Novel Microstrip Franklin Leaky-Wave Antenna Using the Eigenstate Approach
(2019-07-01)
Lu, Jeng-Hau
;
Ng, Herman Jalli
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Kissinger, Dietmar
;
Jou, Christina F.
;
Wu, Lin-Kun
This paper presents the design of a novel periodic leaky-wave antenna (LWA) using modified microstrip Franklin unit cells. Two additional quarter-wave couple-line sections are used to allow the cell to work with the n = -2 fast-wave harmonic. It allows the use of low-epsilon(r) substrates so the designed LWA is cost-effective, can be easily integrated with radar front-end circuits, and avoids the excitation of surface waves. A novel application of eigenstate analysis leads to a simpler and more intuitive approach for the implementation of the reflection cancellation concept to eliminate open-stopband (OSB) effects. This is realized in the proposed structure with the use of a pair of interdigital fingers and different widths for the two lines forming the coupled section. A general design flow is also proposed for the design of the unit cell and LWA. Finally, a 40 cell LWA is fabricated on a Rogers 3003 substrate with epsilon(r) = 3. The measured results show that the beam scans continuously from -54 degrees to +55 degrees when frequency is varied from 54.7 to 70 GHz, and no visible OSB effect is observed near the broadside direction.
總經理特質對於家族持股與公司績效關聯性之影響
(國立交通大學經營管理研究所, 2019-07-01)
戴怡蕙
;
Yi-Hui Tai
過去文獻關於家族持股和公司績效之間的關聯性結論是不一致的，而調節變數可能是影響前述關聯性的原因。又過去文獻提及總經理特質對於公司績效有顯著影響力，因此本研究探討總經理下列四項特質對於家族持股與公司績效之調節效果，分別為：（1）總經理同時兼任董事；（2）總經理由家族成員擔任；（3）總經理經驗；（4）總經理薪酬。本文實證結果發現，若家族持股比率較高，則公司市場績效較差，但會計績效較好。除此之外，總經理由家族成員擔任抑或是提高總經理薪酬會增強（減弱）家族持股與公司績效間的正向（負向）關係。然而，總經理同時兼任董事或總經理經驗較豐富並不會增強（減弱）家族持股與公司績效間的正向（負向）關係。本文研究結果可以補充過去文獻之不足。
Photoconductive properties of polycrystalline selenium based lateral MISIM photodetectors of high quantum efficiency using different dielectrics as the charge blocking layer
(2019-07-01)
Chang, Cheng-Yi
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Huang, Yu-Wei
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Lin, Yi-Jie
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Liao, Jye-Yow
;
Lin, Jian-Siang
We studied the photoconductive performance of polycrystalline selenium (pc-Se) based photodetectors with a lateral metal-insulator-semiconductor-insulator-metal (MISIM) device structure. The insulator layer is a 10 nm-thick Ga2O3, HfO2, or Al2O3 thin film, and used as a charge blocking layer (CBL) to suppress dark current injected from the Al electrodes. The dark current suppression primarily depends on the barrier height of the junctions between the CBLs and electrodes. The Ga2O3 CBL exhibits a poor dark current suppression compared to the HfO2 and the Al2O3 CBLs because of a lower electron barrier at the cathode. The lateral pc-Se photodetectors exhibit a very high internal photocurrent gain due to Fowler-Nordheim tunneling at relatively low applied voltages. The better crystallinity of pc-Se grains formed on the Ga2O3 CBL leads to a higher photoconversion efficiency for the MISIM-Ga2O3 photodetector. Compared with amorphous Se based lateral MISIM photodetectors, the pc-Se photodetectors demonstrate a uniform and much better photoconductive performance over the visible spectrum.
How green marketing, perceived motives and incentives influence behavioral intentions
(2019-07-01)
Chang, Kuo-Chien
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Hsu, Chia-Lin
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Hsu, Ya-Ti
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Chen, Mu-Chen
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運輸與物流管理系註：原交通所+運管所
This study contributes to exploring the effects of regulatory fit with green marketing messages on consumer behavioral intentions by examining the moderating roles of perceived motives of green initiatives and perceived incentive mechanisms. Experiment 1 explores the effects of regulatory fit and non-fit on behavioral intentions in terms of the different types of green marketing messages. Experiment 2 explores the moderating effect of perceived different motives of green initiatives on the link between promotion/prevention regulatory fit and behavioral intentions. Additionally, Experiment 3 examines the moderating effect of perceived different incentive mechanisms on the relationship between promotion/prevention regulatory fit and behavioral intentions. Based on these findings, theoretical and managerial implications are discussed.
Risk of Dementia in Adults With ADHD: A Nationwide, Population-Based Cohort Study in Taiwan
(2019-07-01)
Tzeng, Nian-Sheng
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Chung, Chi-Hsiang
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Lin, Fu-Huang
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Yeh, Chin-Bin
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Huang, San-Yuan
Objective:This study aimed to investigate the association between adults with ADHD and the risk of developing dementia. Method: Utilizing National Health Insurance Research Database of Taiwan, ADHD patients were identified and compared with age- and gender-matched controls (1:3). Results: Of the study participants, 37 (5.48%) developed dementia compared with 81 (4.0%) in the control group. Cox proportional hazards regression analysis revealed that the study participants were more likely to develop dementia. The crude hazard ratio (HR) is 3.418 (95% confidence interval [CI] = [2.289, 5.106], p < .001), and adjusted HR is 4.008 (95% CI = [2.526, 6.361], p < .001) in risk of developing dementia after adjusted for age, gender, comorbidities, geographical area of residence, urbanization level of residence, and monthly income. Conclusion: Adults with ADHD have a 3.4-fold risk of developing dementia, and other large or national data sets should be explored to support the current findings.
探討群衆募資中社會資本之影響效果
(國立交通大學傳播與科技學系, 2019-07)
蕭丞傑
;
游翊宏
;
Cheng-Chieh Hsiao
;
Yi-Hung Yu
近年來，群眾募資的發展越來越快速，許多微型創業家也都選擇透過這個管道傳播自己的創意或理念。為了瞭解目前台灣群眾募資使用之實務現況，本研究以社會資本理論為基礎，探討群眾募資中社會資本對於募資成效及持續使用意圖之影響效果，本研究自台灣群眾募資平台上蒐集了160份成功專案團隊之問卷資料及平台數據資料進行分析。研究結果發現結構資本及認知資本會正向影響專案成效，而關係資本與認知資本則會正向影響持續使用意願。本研究一方面延伸過去研究運用多重資料來源檢驗社會資本對群眾募資的影響，另一方面，本研究基於研究結果建議群眾募資平台應提供更多機制幫助發起者與贊助者之溝通與互動，以提升創意傳播的成效。
Smart Manufacturing Scheduling With Edge Computing Using Multiclass Deep Q Network
(2019-07-01)
Lin, Chun-Cheng
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Deng, Der-Jiunn
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Chih, Yen-Ling
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Chiu, Hsin-Ting
;
工業工程與管理學系
Manufacturing is involved with complex job shop scheduling problems (JSP). In smart factories, edge computing supports computing resources at the edge of production in a distributed way to reduce response time of making production decisions. However, most works on JSP did not consider edge computing. Therefore, this paper proposes a smart manufacturing factory framework based on edge computing, and further investigates the JSP under such a framework. With recent success of some AI applications, the deep Q network (DQN), which combines deep learning and reinforcement learning, has showed its great computing power to solve complex problems. Therefore, we adjust the DQN with an edge computing framework to solve the JSP. Different from the classical DQN with only one decision, this paper extends the DQN to address the decisions of multiple edge devices. Simulation results show that the proposed method performs better than the other methods using only one dispatching rule.
Poly(vinyl alcohol)-controlled synthesis of monodispersed crosslinked poly(methyl methacrylate) microparticles with significantly improved mechanical properties
(2019-07-01)
Kao, Yu-Chen
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Chen, Chun-Hua
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Whang, Wha-Tzong
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Chen, Yi-Chun
;
Chen, Kai-Chi
A facile synthesis concept focusing on the poly(vinyl alcohol) (PVA) concentration induced interfacial energy effects in seed swelling polymerization was realized for the successful fabrication of a series of monodispersed poly(methyl methacrylate) (PMMA) microparticles with four crosslinking agents, 2,2-bis[(methacryloyloxy)methyl]butyl methacrylate, 1,2-ethanediyl bis(2-methylacrylate), 1,3-divinylbenzene and 1,2-ethanediyl diacetate. We revealed a special role of PVA in regulating the diffusion of crosslinking agents as well as the swelling degree of latex seeds and, more noticeably, the consequent improved mechanical properties of the crosslinked PMMA microparticles formed. The highest recovery rate obtained from the PMMA microparticles with 0.6 wt% PVA approached 67%, which is higher than or comparable to reported values. This work not only developed a new facile synthesis approach for producing highly uniform tough crosslinked PMMA microparticles for more potential applications but also provided valuable insights into fundamental aspects of seed swelling polymerization. (c) 2019 Society of Chemical Industry
An incremental learning and integer-nonlinear programming approach to mining users' unknown preferences for ubiquitous hotel recommendation
(2019-07-01)
Chen, Tin-Chih Toly
;
Wang, Yi-Chi
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
To further increase the successful recommendation rate of a ubiquitous hotel recommendation system, an incremental learning and integer-nonlinear programming approach (INLP) is proposed in this study to mine users' unknown preferences. In the proposed methodology, an INLP problem is solved to adjust the values of weights in the recommendation mechanism to be closer to those in the decision-making mechanism so as to maximize the successful recommendation rate. In addition, the weights are adjusted on a rolling basis so that more historical data can be considered without inflating the INLP model. The experimental results showed that the proposed methodology outperformed several existing methods in increasing the successful recommendation rate, even with a cold start.
STAM-CCF: Suspicious Tracking Across Multiple Camera Based on Correlation Filters
(2019-07-01)
Sheu, Ruey-Kai
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Pardeshi, Mayuresh
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Chen, Lun-Chi
;
Yuan, Shyan-Ming
;
交大名義發表
There is strong demand for real-time suspicious tracking across multiple cameras in intelligent video surveillance for public areas, such as universities, airports and factories. Most criminal events show that the nature of suspicious behavior are carried out by un-known people who try to hide themselves as much as possible. Previous learning-based studies collected a large volume data set to train a learning model to detect humans across multiple cameras but failed to recognize newcomers. There are also several feature-based studies aimed to identify humans within-camera tracking. It would be very difficult for those methods to get necessary feature information in multi-camera scenarios and scenes. It is the purpose of this study to design and implement a suspicious tracking mechanism across multiple cameras based on correlation filters, called suspicious tracking across multiple cameras based on correlation filters (STAM-CCF). By leveraging the geographical information of cameras and YOLO object detection framework, STAM-CCF adjusts human identification and prevents errors caused by information loss in case of object occlusion and overlapping for within-camera tracking cases. STAM-CCF also introduces a camera correlation model and a two-stage gait recognition strategy to deal with problems of re-identification across multiple cameras. Experimental results show that the proposed method performs well with highly acceptable accuracy. The evidences also show that the proposed STAM-CCF method can continuously recognize suspicious behavior within-camera tracking and re-identify it successfully across multiple cameras.
新聞網摘型懶人包超文本敘事新方向初探
(國立交通大學傳播與科技學系, 2019-07)
陳雅惠
;
Ya-Hui Chen
為了掌握超文本替新聞敘事帶來哪些挑戰，本文以新聞網摘型懶人包為起始，試圖勾勒出二個未來研究新方向：一是新聞網摘型懶人包新文體的出現，乃因著當代網路超文本才能發揮，因而可從超文本的物質性剖析其與敘事的關聯，同時亦可探討如何從敘事中的情節單位去補捉新聞網摘型懶人包對說故事所帶來的新可能。二是從敘事研究的脈絡談起，討論敘事的內涵隨著跨媒體時代來臨，已從靜態文本結構或某些言者的表達風格轉向主體認知的基礎，將閱聽人認知帶入說故事活動，試圖建構出新的故事心像，使說故事此一活動朝向新的理解與詮釋。而此二者將能對超文本敘事設計提出學理的支持，並成為培養數位時代說新聞故事的新技藝。
Trapping of metallic nanoparticles under the free surface of superfluid helium in a static electric field
(2019-07-01)
Moroshkin, P.
;
Leiderer, P.
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Moeller, Th. B.
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Kono, K.
;
國際半導體學院
Electrically charged metallic microparticles and nanoparticles have been trapped under a free surface of superfluid He-4 in a vertical static electric field. We report the details of the trapping technique and the observed dynamics of the trapped particles moving along the surface and driven by surface waves, by a static horizontal electric field, and by a thermal counterflow within the surface layer of liquid He.
PROPHYLACTIC ANTIBIOTIC REDUCES THE RISK OF PERITONITIS AFTER INVASIVE GYNECOLOGIC PROCEDURES
(2019-07-01)
Fan, Pei-Yi
;
Chan, Ming-Jen
;
Lin, Sheng-Hsuan
;
Wu, Hsin-Hsu
;
Chang, Ming-Yang
Background: Peritonitis is a serious complication after invasive procedures in patients undergoing peritoneal dialysis (PD). Most studies that have investigated peritonitis following invasive gynecologic procedures enrolled small patient populations. This study focuses on the clinical presentation, outcomes, and effects of prophylactic antibiotic use before invasive techniques. Methods: A retrospective study was conducted on patients who underwent invasive gynecologic procedures between 2005 and 2015 in a tertiary medical center. Eligible patients were identified and enrolled and their demographic data were collected. The use of prophylactic antibiotics and the outcomes of peritonitis were recorded. Results: Twenty-six gynecologic procedures were performed on 18 PD patients. Seven episodes of peritonitis occurred in 6 patients after invasive gynecologic procedures. Eleven procedures were preceded by prophylactic antibiotic treatment (6 oral cefadroxil, 1 oral cefuroxime, 1 oral clindamycin, 1 intravenous [IV] ceftriaxone, 1 IV ceftazidime, and 1 IV cefazolin). The pathogens were diverse (group B Streptococcus, group D Streptococcus, E. coli, and Enterococcus). All episodes of peritonitis were successfully treated using intraperitoneal antibiotics without recurrence, technique failure, or mortality. The odds ratio of peritonitis in the non-prophylaxis group was 20.29 (95% confidence interval 1.01 - 406.35, p = 0.0103). Conclusion: The use of prophylactic antibiotic treatment considerably reduced the risk of peritonitis after invasive gynecologic procedures.
Embedded carbon bridges in low-k PECVD silicon carbonitride films using silazane precursors
(2019-07-01)
Chang, Wei-Yuan
;
Chen, Wei-Zhong
;
Lee, Hung-Tse
;
Leu, Jihperng
;
材料科學與工程學系
Low-k, carbon-rich SiCxNy films for diffusion barrier applications have been fabricated by plasma-enhanced chemical vapor deposition (PECVD) using silazanes as the single-source precursor. Linear and cyclic silazane precursors with vinyl groups yield SiCxNy films with carbon bridges, namely ethylene bridges (Si-CH2-CH2-Si) and methylene bridges (Si-CH2-Si), which are readily formed and embedded with the Si-N(-C) matrix. A SiCxNy film of low k = 3.2 is achieved by successful incorporation of ethylene bridge embedded within the Si-N(-C-x) network by using a linear silazane precursor. Also, for these silazanes-deposited SiCxNy films at a fixed dielectric constant below 4.2, cyclic silazane, VSZ (1,3,5-trimethyl-1,3,5-trivinylcyclotrisilazane) produces films of higher film density and modulus, compared to those by a linear silazane precursor. (C) 2019 The Japan Society of Applied Physics
Visible Light Communication System for Offshore Wind Turbine Foundation Scour Early Warning Monitoring
(2019-07-01)
Lin, Yung-Bin
;
Lin, Tzu-Kang
;
Chang, Cheng-Chun
;
Huang, Chang-Wei
;
Chen, Ben-Ting
Offshore wind farms have a superior wind source to terrestrial wind farms, but they also face more severe environmental conditions such as severe storms, typhoons, and sea waves. Scour leads to the excavation of sediments around the foundations of structures, reducing the safe capacity of the structures. The phenomenon of pier scour is extremely complex because of the combined effects of the vortex system involving time-dependent flow patterns and sediment transport mechanisms. A real-time scour monitoring system can improve the safety of structures and afford cost-effective operations by preventing premature or unnecessary maintenance. This paper proposes an on-site scour monitoring system using visible light communication (VLC) modules for offshore wind turbine installations. A flume experiment revealed that the system was highly sensitive and accurate in monitoring seabed scour processes. This arrayed-VLC sensory system, proposed in this paper, has considerable potential for safety monitoring and also can contribute to improving the accuracy of empirical scour formulas for sustainable maintenance in the life cycle of offshore structures.
A classifying ubiquitous clinic recommendation approach for forming patient groups and recommending suitable clinics
(2019-07-01)
Chen, Tin-Chih Toly
;
Chiu, Min-Chi
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
Existing ubiquitous clinic recommendation systems assume that patients' preferences are alike and thus apply the same recommendation mechanism to all mobile patients. However, this assumption may be unreasonable and must be relaxed. Accordingly, this study proposes a classifying ubiquitous recommendation approach. The classifying ubiquitous recommendation approach divides patients into multiple groups by mining their unknown preferences before recommending them suitable clinics. To tune the recommendation mechanism of each patient group, an integer nonlinear programming problem is solved in a rolling manner. When a new patient accesses the ubiquitous clinic recommendation system, the recommendation mechanisms of all groups are applied to recommend the suitable clinic to the new patient. The results of a regional experiment indicated that the classifying ubiquitous recommendation approach improved the successful recommendation rate by up to 52%. Therefore, patients' unknown preferences are different and affect their behaviors in choosing clinics, which should be considered in grouping patients and in tailoring the clinic recommendation mechanism.