Browsing by Issue Date, starting with "2020-04-01"

Now showing 1 - 20 of 5388

Building lattices and zeta functions
(2020-04-01)
Deitmar, Anton
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Kang, Ming-Hsuan
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McCallum, Rupert
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應用數學系
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Department of Applied Mathematics
We give a Lefschetz formula for tree lattices and apply it to geometric zeta functions. We further generalize Bass's approach to Ihara zeta functions to the higher-dimensional case of a building.
疾病隱喻下的底層之聲
(國立陽明交通大學出版社, 2020-04-01)
陳重仁
影像選輯
(深河出版有限公司, 2020-04-01)
李俊峰
Associations Among Emotional State, Sleep Quality, and Resting-State EEG Spectra: A Longitudinal Study in Graduate Students
(2020-04-01)
Komarov, Oleksii
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Ko, Li-Wei
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Jung, Tzyy-Ping
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交大名義發表
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生物資訊及系統生物研究所
University students are routinely influenced by a variety of natural stressors and experience irregular sleep-wake cycles caused by the necessity to trade sleep for studying while dealing with academic assignments. Often these factors result in long-term issues with daytime sleepiness, emotional instability, and mental exhaustion, which may lead to difficulties in the educational process. This study introduces the Daily Sampling System (DSS) implemented as a smartphone application, which combines a set of self-assessment scales for evaluating variations in the emotional state and sleep quality throughout a full academic term. In addition to submitting the daily sampling scores, the participants regularly filled in the Depression, Anxiety, and Stress Scales (DASS) reports and took part in resting-state EEG data recording immediately after report completion. In total, this study collected 1835 daily samples and 94 combined DASS with EEG datasets from 18 university students (aged 23-27 years), with 79.3 +/- 15.3% response ratio in submitting the daily reports during an academic semester. The results of pairwise testing and multiple regression analysis demonstrate that the daily level of self-perceived fatigue correlates positively with stress, daytime sleepiness, and negatively with alertness on awakening, self-evaluated sleep quality, and sleep duration. The spectral analysis of the EEG data reveals a significant increase in the resting-state spectral power density across the theta and low-alpha frequency bands associated with increased levels of anxiety and stress. Additionally, the state of depression was accompanied by an intensification of high-frequency EEG activity over the temporal regions. No significant differences in prefrontal alpha power asymmetry were observed under the described experimental conditions while comparing the states of calmness and emotional arousal of the participants for the three conditions of depression, anxiety, and stress.
Research on Efficiency Improvement of Xiamen Port Based on Trans-Log Cost Function
(2020-04-01)
Zou, Ya
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Feng, Cheng-Min
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
Web Mining Customer Perceptions to Define Product Positions and Design Preferences
(2020-04-01)
Chang, Ai-Che
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Trappey, Charles, V
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Trappey, Amy J. C.
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Chen, Luna W. L.
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交大名義發表
E-commerce provides a global platform supporting product transactions through the consumer purchase lifecycle including communications of perceived satisfaction and dissatisfaction. The customer feedback functions and social networks of many e-commerce websites allow for the creation of extremely large databases that can be mined to model the customers' perceptions toward online purchases. This research uses online customer reviews as the business intelligence corpus to help companies redesign products that better satisfy consumer preferences and differentiate their product offerings. After identifying the specific webpages of customer reviews, a web crawler collects review text. Computer-supported text mining, cluster analysis, and perceptual mapping are combined as a systematic analytic approach to compare products in a given domain. The study assists phone manufacturers to understand the positive and negative perceptions of customers related to their post-purchase experiences. The customer-preferred product functions, features, and price positions provide valuable strategic intelligence for new product designs and market differentiation.
A 75-Gb/s/mm(2) and Energy-Efficient LDPC Decoder Based on a Reduced Complexity Second Minimum Approximation Min-Sum Algorithm
(2020-04-01)
Lopez, Henry
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Chan, Hsun-Wei
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Chiu, Kang-Lun
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Tsai, Pei-Yun
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Jou, Shyh-Jye Jerry
This article presents a high-throughput and low-routing complexity low-density parity check (LDPC) decoder design based on a novel second minimum approximation min-sum (SAMS) algorithm. The routing congestion is mitigated by reducing the required interconnections in the critical path of the routing network. The implementation and postlayout results with 28-nm 1P9M CMOS process show that the proposed design can achieve a throughput of 10.5 Gb/s for a millimeter-wave 60-GHz baseband system while satisfying the low bit error rate (BER) requirements (10(-7)). The proposed design reduces the wiring in the routing network by 21% and improves the area by 12% compared to the conventional min-sum (MS) and normalized MS (NMS) algorithm. Additional hardware optimizations are obtained by considering the internal message passing resolution based on the BER and signal-to-noise ratio (SNR) requirements for a practical baseband system. The power consumption is efficiently reduced by the employment of a shared address generator that exploits the degree of parallelism to reduce the switching activity on a group of memory elements. The LDPC decoder is implemented with a core area of 0.14 mm(2), power consumption of 81 mW at 312.5 MHz, and the area and power efficiency of 75 Gb/s/mm(2) and 10.2 pJ/bit, respectively.
曾健民訪談側記
(深河出版有限公司, 2020-04-01)
陳冉涌
以精實生產與創新方法探討中藥丸劑成丸技術
(國立交通大學經營管理研究所, 2020-04-01)
林裕家
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饒忻
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Yu-Jia Lin
;
Hsin Rau
骨質疏鬆是一種進行式的老化現象，隨著年齡增長，骨量漸漸流失。骨質疏鬆初期常有腰酸背痛、下背痛或頸椎腰椎疼痛的情况。龜鹿二仙膠丸為強健筋骨及補精氣的常用中藥方，組成為四味藥材，以鹿角、龜板、枸杞及人參熬製而成，效果良好，尤其對骨質疏鬆症更有效。丸劑是將一種或多種藥物碾成細粉後加入適當結合劑，用人工或機器製成圓球固體製劑。丸劑是最古老，最常用，最廣泛中藥製劑之一，具有服用、攜帶方便及保存時間較長的優點，常見的丸劑為蜜丸與水丸。蜜丸是將藥物細粉以煉製過的蜂蜜作為黏合劑製成的圓形丸劑。台灣中藥製造業，從代工廠發展到目前已有多家自有品牌，對消費者品質及售價要求相對需付出更高的心力。近來由於人工費用、原物料價格上漲，整體生產成本逐年提高，為改善品質去除浪費，業者紛紛的追求降低不良率及降低成本，透過不斷改善及消除浪費來達成目標。本研究以精實生產為理論基礎，並以創造性問題解決（Creative Problem Solving）模式為主架構，並融入萃智方法（TRIZ）以解决問題，再利用專利分析，實際探討中藥丸劑成丸技術。目前案例公司生產的龜鹿二仙膠丸以蜜丸為主，製丸後丸劑與丸劑間成串無法分離。本研究以創新手法改善製程設備及消除工作中的浪費，不但提升製丸速度，保護人員作業安全，同時也降低人工成本。
Study on the effects of Si implantation on the interface of 4H-SiC lateral MOSFETs
(2020-04-01)
Jiang, Jheng-Yi
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Hung, Jia-Qing
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Huang, Pin-Wei
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Wu, Tian-Li
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Huang, Chi-Fang
In this study, Si implantation was used to improve the interface properties of SiC/SiO2 in 4H-SiC lateral MOSFETs. In lateral n-channel MOSFETs, a 4%-6% improvement on the linear and saturation current was observed with Si implantation, From high/low-frequency CV measurements, the Si implanted n-type MOS capacitor showed a 20% lower interface state density than the non-implanted ones at an energy level of E-C - E = 0.2 eV, without degrading oxide integrity. Lateral p-channel MOSFETs, on the other hand, showed a 36.5% reduction in the linear current and a 16.6% reduction in the saturation current with Si implantation. Furthermore, the temperature coefficients of lateral and vertical MOSFETs implanted, by Si ere monitored up to 175 degrees C. The temperature coefficients of the Si-implanted n-channel and p-channel lateral MOSFETs were nearly identical to those of their non-implanted counterparts. (C) 2020 The Japan Society of Applied Physics
A novel photoresist-based film-profile engineering scheme for fabricating double-gated, recess-channel IGZO thin-film transistors
(2020-04-01)
Huang, Yu-An
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Peng, Kang-Pin
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Meng, Yu-Chiao
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Su, Chun-Jung
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Li, Pei-Wen
We reported an experimental fabrication of double-gated (DG) thin-film transistor (TFT) with IGZO recess-channel using a designer photoresist-based thin-film profile engineering approach. In this approach, an organic shadow mask of photoresist (PR) was formed over a p(+)-Si wafer that was encapsulated by an oxide layer, The lithographically-patterned PR layer is an effective mask for shadowing reactive species during the subsequent deposition steps of IGZO and Aluminum, enabling the formation of IGZO recess-channel and discrete Al source/drain pads at room temperature. The top-gate or DG configurations with the Si substrate serving as the bottom-gate were investigated. The fabricated DG TFTs show significant; improvements in both I-ON and I-OFF as compared with single-gated TFTs. The proposed process scheme is readily applicable to the back-end-of-line of a chip. This work demonstrates the feasibility of IGZO recess-channel TFTs in various gated configurations, enabling a building block for emerging functional devices for More-than-Moore applications. (C) 2020 The Japan Society of Applied Physics
Vibration suppression of drilling tool system during deep-hole drilling process using independence mode space control
(2020-04-01)
Kong, Lingfei
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Cao, Shuai
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Chin, Jih-Hua
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Si, Yue
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Miao, Falin
Deep-hole drilling technology is commonly used in the aerospace and automobile industries, for new-energy equipment manufacturing, and in the high-tech industries. While this technology produces high-quality holes, higher quality is pursued. A method to improve the processing quality is to suppress the vibration modes associated with long shafts. This problem was addressed with an aim of real-time application. In addition, a higher goal was set by way of providing a solution (in full) to the associated problem, to shed light on processes that bear similar features in manufacturing and for other industries. An operable control scheme was constructed by transforming the system dynamics to modal space for modal decoupling and truncation. The modal displacement and velocity information estimated by the modal filtering were introduced into the feedback gain matrix. All obstacles in traditional physical space were shunned. A damper/sensor position optimisation algorithm was suggested to minimise the modal spillover and acquire modal orthogonality, which led to a new method that has an edge on all preceding methods because of its stronger ability. A system capable of real-time suppression of modal vibration in a deep-hole drilling tool was built and implemented. Using hole roundness error as the criterium, it was found that further improvement of hole quality was achieved. The idea presented in this work may pave the way for elevating the quality of other manufacturing processes with similar weak stiffness features, such as those seen in long-shaft tools or thin-wall workpieces. The method may also provide a reference for other industries with relevant or comparable problems.
Evaluating the sustainability of a smart technology application to mobile health care: the FGM-ACO-FWA approach
(2020-04-01)
Chen, Tin-Chih Toly
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工業工程與管理學系
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Department of Industrial Engineering and Management
Smart technologies present numerous opportunities for enhancing mobile health care. However, existing applications of smart technologies to mobile health care face several difficulties. As a result, whether a smart technology application to mobile health care will be sustainable is questionable. To address this issue, the fuzzy geometric mean (FGM)-alpha-cut operations (ACO)-fuzzy weighted average (FWA) approach is proposed in this study. In the proposed methodology, at first FGM is applied to aggregate multiple experts' opinions on the relative importance of a critical factor. Then, ACO is applied to derive the absolute fuzzy importance level of the critical factor. At last, FWA is applied to assess the sustainability of the smart technology application to mobile health care. The proposed methodology has been applied to assess the sustainability of thirteen smart technology applications to mobile health care. According to the experimental results, the most and least sustainable smart technology applications to mobile health care were smart mobile service and smart clothes, respectively. In addition, the ranking result using the proposed methodology was somewhat different from those using existing methods based on approximation.
Well-behaved 4H-SiC PMOSFET with LOCal oxidation of SiC (LOCOSiC) isolation structure and compromised gate oxide for Sub-10V SiC CMOS application
(2020-04-01)
Hung, Chia-Lung
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Tsui, Bing-Yue
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
SiC devices are suitable for high temperature applications due to its' wide energy bandgap and high thermal conductivity. Some SiC CMOSFET ICs have been reported recently. However, less literature address the characteristics of SiC PMOSFET. In this work, we fabricated PMOSFET with Local Oxidation of SiC (LOCOSiC) isolation structure and different gate oxidation processes targeting sub-10V operation. Well behaved PMOSFET with suitable threshold voltage ( - 5.58 V), low subthreshold swing (200 mV/decade), acceptable hole mobility (3 cm(2)/V-sec), and low off-state current ( < 1 x 10(-12) A/mu m at -10 V) is achieved. Temperature dependence of device characteristics are investigated. These results make the implementation of high-performance CMOS a great progress.
Improved TDDB Reliability and Interface States in 5-nm Hf0.5Zr0.5O2 Ferroelectric Technologies Using NH3 Plasma and Microwave Annealing
(2020-04-01)
Chen, Yi-Hsuan
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Su, Chun-Jung
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Yang, Ting-Hsin
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Hu, Chenming
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Wu, Tian-Li
This article reports that the enhanced forward gate bias time-dependent dielectric breakdown (TDDB) reliability and interface quality are achieved in 5-nm ferroelectric Hf0.5Zr0.5O2 (HZO) technologies by using the NH3 plasma interfacial layer (IL) treatment and microwave annealing (MWA). An orthorhombic crystalline phase is observed in the annealed HZO film with NH3 plasma IL treatment and MWA, and NH3 plasma IL treatment can suppress Hf/Zr interdiffusion. Metal-oxide-semiconductor capacitors (MOSCAPs) subjected to NH3 plasma IL treatment and 2100-W MWA also have a higher extrapolated operating voltage for a ten-year lifetime at 0.01% failure and lower interface state density compared to the devices subjected to only rapid thermal annealing (RTA) at 600 degrees C. Therefore, NH3 plasma treatment and MWA are effective for improving the TDDB reliability and interface quality of the ultrathin ferroelectric HZO.
A Geometric Approach for Optimal Power Control and Relay Selection in NOMA Wireless Relay Networks
(2020-04-01)
Gau, Rung-Hung
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Chiu, Hsiao-Ting
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Liao, Chien-Hsun
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電信工程研究所
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Institute of Communications Engineering
In this paper, we propose a geometric approach for optimal power control and relay selection in NOMA wireless relay networks. First, for each pair of relays, to derive an optimal vector of transmission power that maximizes the network throughput, we formulate a non-convex optimization problem. To obtain a closed-form solution for the non-convex optimization problem, we adopt ellipses and hyperbolas for classification of transmission power vectors. In addition, the proposed geometric approach could be used to select an optimal pair of relays and an optimal vector of transmission power in polynomial time. Furthermore, we observe that allocating all transmission power of the BS to send data to the stronger relay is not necessarily optimal in a NOMA wireless relay network. Simulation results show that the proposed geometric approach could significantly increase the end-to-end sum rate and reduce the power consumption of wireless communications for NOMA wireless relay networks with low computational complexity.
A Reconfigurable 64-Dimension K-Means Clustering Accelerator With Adaptive Overflow Control
(2020-04-01)
Du, Li
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Du, Yuan
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Chang, Mau-Chung Frank
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交大名義發表
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National Chiao Tung University
This brief presents a novel reconfigurable $K$ -means clustering accelerator that is suitable for integration in both IoT and data center system. The high vector dimension reconfigurability and design cost reduction is achieved through vector-streaming and adaptive overflow control to adapt distance computation using as-needed precision (dynamic 16-bit fixed-point data format). A two-stage shift-bit counted comparator is proposed. It can determine most results through only turning on the shift-bit comparator (3-bit), reducing the power consumption by $7\times $ compared to the direct full dynamic range comparison. Four vectors with two cluster centroids are processed simultaneously. Up to 8-dimension cluster vectors are stored in local buffer to reduce data exchange between the main memory and the processing engine. A prototype accelerator was implemented in TSMC 65 nm. The accelerator occupied 0.26 mm(2) and can support up to 64-D vector clustering. It achieved 31.2M query vectors/s with 41-mW power consumption at 250-MHz clock (cluster number: 2, vector dimension: 64) and an energy efficiency of 0.41 TOPS/W at 30 MHz clock.
Metabolic Engineering Design Strategies for Increasing Acetyl-CoA Flux
(2020-04-01)
Ku, Jason T.
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Chen, Arvin Y.
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Lan, Ethan I.
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生物科技學系
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分子醫學與生物工程研究所
Acetyl-CoA is a key metabolite precursor for the biosynthesis of lipids, polyketides, isoprenoids, amino acids, and numerous other bioproducts which are used in various industries. Metabolic engineering efforts aim to increase carbon flux towards acetyl-CoA in order to achieve higher productivities of its downstream products. In this review, we summarize the strategies that have been implemented for increasing acetyl-CoA flux and concentration, and discuss their effects. Furthermore, recent works have developed synthetic acetyl-CoA biosynthesis routes that achieve higher stoichiometric yield of acetyl-CoA from glycolytic substrates.
DAD-FF: Hardening Designs by Delay-Adjustable D-Flip-Flop for Soft-Error-Rate Reduction
(2020-04-01)
Lin, Dave Y. -W.
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Wen, Charles H. -P.
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電機工程學系
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Department of Electrical and Computer Engineering
For the safety-critical applications such as biomedical and automobile electronics, the system failure induced by soft errors becomes a major issue of reliability. However, most of the commercial cell libraries do not include radiation-hardened components to build a safety-critical design. Therefore, a delay-adjustable D-flip-flop (DAD-FF) is proposed together with a design flow to construct a radiation-hardened system by automation. To enable such radiation-hardened design into the current design flow, DAD-FF is characterized as a general cell and compiled as a patch in the NanGate FreePDK45 bulk 45-nm open cell library, as an example. The experimental results show that DAD-FF is capable of reducing $1.3\times 10<^>{10}\text{X}$ soft errors with respect to the standard flip-flop (STD-FF) and resisting over 99.999997% strikes of heavy ions. Meanwhile, four radiation-hardened benchmark circuits are synthesized with DAD-FF cell, and further used to prove the effectiveness against soft errors compared to a prior work, built-in soft-error resilience (BISER), with 18% area and 40% timing improvement. To sum up, DAD-FF is elaborated from the modeling at the device-level to the validation at the system-level and exhibits its strong robustness to soft errors.
篤志而近思：崔元植訪談
(深河出版有限公司, 2020-04-01)
崔元植
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陳光興
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白池雲
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宋嘉俳