Browsing by Issue Date, starting with "2018-10-01"

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A Model-Based-Random-Forest Framework for Predicting V-t Mean and Variance Based on Parallel I-d Measurement
(2018-10-01)
Lin, Chien-Hsueh
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Tsai, Chih-Ying
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Lee, Kao-Chi
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Yu, Sung-Chu
;
Liau, Wen-Rong
To measure the variation of device V-t requires long test for conventional wafer acceptance test (WAT) test structures. This paper presents a framework that can efficiently and effectively obtain the mean and variance of V-t for a large number of designs under test (DUTs). The proposed framework applies the model-based random forest as its core model-fitting technique to learn a model that can predict the mean and variance of V-t based only on the combined I-d measured from parallel connected DUTs. The proposed framework can further minimize the total number of I-d measurement required for prediction models while limiting their accuracy loss. The experimental results based on the SPICE simulation of a UMC 28-nm technology demonstrate that the proposed model-fitting framework can achieve a more than 99% R -squared for predicting either V-t mean or V-t variance. Compared to conventional WAT test structures using binary search, our proposed framework can achieve a 120.3x speedup on overall test time for test structures with 800 DUTs.
[系所動態]資工系三組整併 CS+X跨領域人才培育
(國立交通大學資訊學院, 2018-10)
彭文志
近年來跨領域創新已成為世界趨勢，本系為提供學生多元學習的機會，除了繼續強化基礎課程的學習，同時也將使專業課程在選修上更具彈性，以促使多元整合之機會。資工系擬於108 學年度起取消學士班學籍分組，將原先資工、資電以及網多三組整併，以鼓勵學生多元學習不同專業科目，激發創新思考，期待培育出擁有扎實的資訊工程基礎並具備新一代跨領域創新、學習和思考之青年。
Erbium-doped fiber dual-ring laser with stable single-longitudinal-mode and 55-nm tuning range
(2018-10-01)
Yeh, Chien-Hung
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Yang, Zi-Qing
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Huang, Tzu-Jung
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Chow, Chi-Wai
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Chang, Yao-Jen
In the investigation, we propose and demonstrate a stabilized and wavelength-selectable erbium-doped fiber (EDF) compound-ring laser with single-longitudinal-mode (SLM) oscillation covering both C-band and L-band ranges. Here, the dual-ring-cavity (DRC) scheme with an unpumped EDF-based saturable absorber (SA) is proposed in the EDF laser to guarantee SLM output. The proposed DRC of EDF laser can produce the mode-filter and ultra-narrowband auto-tracking filter effects to suppress the densely multi-longitudinal-mode (MLM) and extend the effective gain of EDF in a wavelength range of 1525.0-1580.0 nm. In addition, the observed output stabilities of power and wavelength in the proposed EDF DRC laser are also experimented and discussed. (C) 2018 Elsevier Ltd. All rights reserved.
Decision-theoretic model to identify printed sources
(2018-10-01)
Tsai, Min-Jen
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Yuadi, Imam
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Tao, Yu-Han
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資訊管理與財務金融系註：原資管所+財金所
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Department of Information Management and Finance
When trying to identify a printed forged document, examining digital evidence can prove to be a challenge. Over the past several years, digital forensics for printed document source identification has begun to be increasingly important which can be related to the investigation and prosecution of many types of crimes. Unlike invasive forensic approach which requires a fraction of the printed document as the specimen for verification, noninvasive forensic technique uses the optical mechanism to explore the relationship between the scanned images and the source printer. To explore the relationship between source printers and images obtained by the scanner, the proposed decision-theoretical approach utilizes image processing techniques and data exploration methods to calculate many important statistical features, including: Local Binary Pattern (LBP), Gray Level Co-occurrence Matrix (GLCM), Discrete Wavelet Transform (DWT), Spatial filters, the Wiener filter, the Gabor filter, Haralick, and SFTA features. Consequently, the proposed aggregation method intensively applies the extracted features and decision-fusion model of feature selections for classification. In addition, the impact of different paper texture or paper color for printed sources identification is also investigated. In the meantime, the up-to-date techniques based on deep learning system is developed by Convolutional Neural Networks (CNNs) which can learn the features automatically to solve the complex image classification problem. Both systems have been compared and the experimental results indicate that the proposed system achieve the overall best accuracy prediction for image and text input and is superior to the existing approaches. In brief, the proposed decision-theoretical model can be very efficiently implemented for real world digital forensic applications.
Resource Allocation in Vehicular Cloud Computing Systems With Heterogeneous Vehicles and Roadside Units
(2018-10-01)
Lin, Chun-Cheng
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Deng, Der-Jiunn
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Yao, Chia-Chi
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工業工程與管理學系
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Department of Industrial Engineering and Management
Vehicular cloud computing (VCC) system coordinates the vehicular cloud (consisting of vehicles' computing resources) and the remote cloud properly to provide in-time services to users. Although pervious works had established the models for resource allocation in the VCC system based on semi-Markov decision processes (SMDPs), few of them discussed heterogeneity of vehicles and influences of roadside units (RSUs). Heterogeneous vehicles made by different manufacturers may be equipped with different amount of computing resources; and furthermore, RSU can enhance the computing capability of VCC. Therefore, this paper creates an SMDP model for VCC resource allocation that additionally considers heterogeneous vehicles and RSUs, and proposes an approach for finding the optimal strategy of VCC resource allocation. The two additional features significantly elaborate the SMDP model, and demonstrate different results from the original model. Simulation shows that the resource allocation in the VCC system can be captured by the proposed model, which performs well in terms of long-term expected values (consisting of consumption costs of power and time), under various parameter settings.
[學術交流]迎戰數位經濟創新技術促產業升級
(國立交通大學資訊學院, 2018-10)
林珮雯
面對數位經濟的新變化與新氣象，科技部推動「數位經濟技術創新研發與應用專案計畫」，聚焦於智慧機械、金融科技及長照醫療等重大研究議題，本院多位教授為相關領域傑出之專家學者皆參與其中，研究團隊陣容堅強，使學術研究成果落實到產業應用的層次，學用合一極具產業經濟價值。
台湾股市卖空共移与总合卖空交易的预测能力
(国立交通大学, 2018-10-01)
王子湄
;
林怡君
;
Zi-Mei Wang
;
Yi-Chun Lin
本文从整体市场层次出发，利用台湾股市散户融券卖空与法人借券卖空交易，探讨卖空者能否掌握较佳的整体市场资讯。首先，我们观察到卖空共移现象，亦即个股融（借）券卖空活动会随着整体市场以及同产业卖空活动一起增减。总合融（借）券卖空与未来短期大盘报酬有显着的正（负）相关，比起空头市场，多头期间总合融（借）券卖空与未来大盘走势有更强烈的关系。另外，台湾股市在市场发生大变动时会采取暂时性的卖空限制政策，这种政策性调整会降低整体法人借券卖出对大盘走势的预测能力。散户因为无法正确掌握整体市场的盈余宣告内容、重要经济指标表现以及市场情绪，使得总合融券水准成为未来大盘走势的反向指标。相反地，法人能掌握较佳的整体市场资讯，当总合借券卖出增加时，未来大部分公司的盈余宣告内容将比市场预期来得差，而且法人能正确掌握整体市场情绪变化。
Risk of dementia after charcoal-burning suicide attempts: a nationwide cohort study in Taiwan
(2018-10-01)
Chang, Shan-Yueh
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Chien, Wu-Chien
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Chung, Chi-Hsiang
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Chang, Hsin-An
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Kao, Yu-Chen
This study aimed to investigate the association between charcoal-burning suicide attempts and the risk of developing dementia. A nationwide, matched cohort, population-based study enrolled a total of 4103 patients with newly diagnosed charcoal-burning suicide attempts, between 2000 and 2010, which were selected from the National Health Insurance Research Database of Taiwan, along with 12,309 controls matched for sex and age. After adjusting for confounding factors, Fine and Gray's competing risk analysis was used to compare the risk of developing dementia during the 10-year followup period. Of the enrolled patients (n=16,412), dementia developed in 303 (1.85%), including 2.56% in the study group (105 in 4103) and 1.61% (198 in 12,309) in the control group. The Fine and Gray's survival analysis revealed that the patients with charcoal-burning suicide attempts were likely to develop dementia, with a crude HR of 5.170 (95% CI 4.022 to 6.644, p<0.001). After adjusting for age, sex, comorbidity, geographic area and urbanization level of residence, and monthly insured premium, the adjusted HR was 4.220 (95% CI 3.188 to 5.586, p<0.001). Suicide attempts were associated with an increased risk of degenerative dementia in this study. Patients with charcoal-burning suicide attempts had a fourfold risk of dementia than the control group.
Energy Efficient Multi-User Millimeter Wave MIMO Systems Using Tree Search Hybrid Precoding and Few-Bit ADCs
(2018-10-01)
Chen, Hsin-Jung
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Lin, Li-Feng
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Chung, Wei-Ho
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Lee, Ta-Sung
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電信工程研究所
Millimeter wave (mmWave) communication is an emerging technique to provide large bandwidth in cellular systems. However, mmWave signals experience more pathloss than the microwave signals adopted in current wireless communications. Therefore, a mmWave system tends to adopt a large number of antennas to combat pathloss with high beamforming gain. In conventional multi-antenna systems, both beamforming and precoding are done digitally in baseband. The high cost and power consumption of certain components in mmWave systems render conventional architecture infeasible. In this paper, we consider low complexity hybrid analog/digital precoding and low-resolution analog-digital converters (ADCs) (1-3 bits) in downlink multiuser mmWave MIMO systems. We propose a new transmission scheme involving rationale of beamspace MIMO communications and beam selection. We also develop a low complexity beam selection algorithm and evaluate adaptive selection on the RF configuration for energy efficiency (EE) optimization. Our analysis and simulation results show that the proposed scheme can significantly reduce system complexity and achieve good performance on energy efficiency and detection.
Intrinsic Difference Between 2-D Negative-Capacitance FETs With Semiconductor-on-Insulator and Double-Gate Structures
(2018-10-01)
You, Wei-Xiang
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Su, Pin
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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
With the aid of an analytical and general model, this paper investigates the intrinsic difference in the negative-capacitance (NC) effect and design space between semiconductor-on-insulator(SOI) and double-gate (DG) metal-ferroelectric-insulator-semiconductor-type NC field-effect transistors (NCFETs) with a 2-D semiconducting transition-metal-dichalcogenide channel (2-D NCFET). By examining the distributions of internal charge, voltage gain, and capacitance matching over the whole bias range, the intrinsic difference in NC effects between these two topologies is pointed out and explained. Our study indicates that for an intrinsic DG 2-D NCFET, it is difficult to achieve sub-2.3 kT/q average subthreshold swing (SS). By contrast, the bias-dependent subthreshold internal charge and larger curvature of ferroelectric capacitance due to the independent backgate in the SOI 2-D NCFET enable larger design space and sub-2.3 kT/q average SS, making it more suitable for low-power applications.
Multi-objective competitive location problem with distance-based attractiveness for two facilities
(2018-10-01)
Wang, Sheng-Chuan
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Lin, Chun-Cheng
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Chen, Ta-Cheng
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Hsiao, Han C. W.
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工業工程與管理學系
The multi-objective competitive location problem with distance-based attractiveness for two facilities (MOCLP-2 facilities) is introduced in this paper. A demand point is covered by two facilities, and the preferred facility satisfies the criteria of maximum attractiveness and minimum distance to the demand point. Facility attractiveness is defined as a distance-based coverage of the facility that can be full coverage, no coverage, or partial coverage of the demand point, depending on the within maximum full coverage radius, outside partial coverage radius between those two radii, respectively. The problem is formulated as a multi-objective optimization model to find a facility with maximum attractiveness and minimum distance. The contributions of this paper is that the problem can be tractably decided by the introduced non-dominated range (N.d. range) with less computation. Furthermore, extensive examples for facility selection and sensitivity analysis demonstrate its effectiveness and efficiency by the developed N.d. range.
Multi-stimuli-responsive high contrast fluorescence molecular controls with a far-red emitting BODIPY-based [2]rotaxane
(2018-10-01)
Arumugaperumal, Reguram
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Venkatesan, Parthiban
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Shukla, Tarun
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Raghunath, Putikam
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Singh, Ravinder
A novel fluorescent switchable [2]rotaxane NIR4 composed of two different molecular stations and rotaxane arms terminated with far-red boron-dipyrromethene (BODIPY) fluorophores and its derivatives were synthesized by CuAAC click chemistry. The molecular shuttling motion of mechanically interlocked molecules (MIMs) could be addressed by the fluorescence signal transduction via distance dependent photo-induced electron transfer process of [2]rotaxane NIR4 triggered by external chemical stimuli of acid/base. Moreover, the flexible arms of triazolium moiety in [2]rotaxane NIR4 and its axle NIR2 exhibited impressive selectivity and sensitivity toward complementary anionic analyte (H2PO4-), where the specific mechanical molecular motion was supported by quantum mechanical calculations. The development of [2]rotaxane NIR4 with a high level of structural complexity can be utilized for novel dual sensory detections of acid-base and dihydrogen phosphate (H2PO4-) anion. Importantly, the host of NIR2 and [2]rotaxane NIR4 could be applied for the vitro imaging and clarify the distribution of H2PO4- at subcellular levels.
Balance Control and Energetics of Powered Exoskeleton-Assisted Sit-to-Stand Movement in Individuals With Paraplegic Spinal Cord Injury
(2018-10-01)
Mao, Hui-Fen
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Huang, Hsing-Po
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Lu, Tung-Wu
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Wang, Ting-Ming
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Wu, Cheng-Hua
Objective: To quantify the effects of initial hip angle and angular hip velocity settings of a lower-limb wearable robotic exoskeleton (WRE) on the balance control and mechanical energy requirements in patients with paraplegic spinal cord injuries (SCIs) during WRE-assisted sit-to-stand (STS). Design: Observational, cross-sectional study. Setting: A university hospital gait laboratory with an 8-camera motion analysis system, 3 forceplates, a pair of instrumented crutches, and a WRE. Participants: Patients (N = 12) with paraplegic SCI. Interventions: Not applicable. Main Outcome Measures: The inclination angle (IA) of the body's center of mass (COM) relative to the center of pressure (COP), and the rate of change of IA (RCIA) for balance control, and the mechanical energy and forward COM momentum before and after seat-off for energetics during WRE-assisted STS were compared between conditions with 2 initial hip angles (105 degrees and 115 degrees) and 3 initial hip angular velocities (800, 1000, 1200 rpm). Results: No interactions between the main factors (ie, initial hip angle vs angular velocity) were found for any of the calculated variables. Greater initial hip angle helped the patients with SCI move the body forward with increased COM momentum but reduced RCIA (P<.05). With increasing initial angular hip velocity, the IA and RCIA after seat-off (P<.05) increased linearly while total mechanical energy reduced linearly (P<.05). Conclusions: The current results suggest that a greater initial hip angle with smaller initial angular velocity may provide a favorable compromise between momentum transfer and balance of the body for people with SCI during WRE-assisted STS. The current data will be helpful for improving the design and clinical use of the WRE. (C) 2018 by the American Congress of Rehabilitation Medicine
[活動花絮]NCTU x acer物聯網競賽
(國立交通大學資訊學院, 2018-10)
林珮雯
交大資工與Acer 共同舉辦物聯網競賽，並於2018 年6 月26 日擴大辦理成果展。今年比賽相當激烈，各個作品均是同學知識與技術的結晶，且具相當創意與實務性。交大M2M 智慧聯網研發中心副主任范倫達教授表示，Acer aBeing 是智慧科技的重要雲端平台，可預期aBeing 會愈來愈有影響力。
Hybrid MIMO-OFDM Beamforming for Wideband mmWave Channels Without Instantaneous Feedback
(2018-10-01)
Lin, Yuan-Pei
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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
In this paper, we consider the design of statistical multiple-input-multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) beamformers for millimeter wave (mmWave) channels. The transmitter designs the subcarrier beamformers based on the statistics of the channel, without instantaneous channel information. To overcome the radio frequency (RF) limitation in mmWave application, the subcarrier beamformers are implemented in a hybrid structure, which imposes constraints on the design of subcarrier beamformers. We analyze the unconstrained statistical subcarrier beamformers using spectral analysis of the subcarrier channels. The analysis shows that, for each subcarrier channel, the optimal statistical beamformer is approximately a linear combination of optimal statistical beamformers for some appropriately defined narrowband single-cluster subchannels. The result suggests a design of the subcarrier beamformers that can be readily implemented in a hybrid structure. Furthermore, a hybrid design for the receiver is proposed based on the concept of vector quantization. Simulations are given to show that the use of a hybrid beamforming structure incurs a minor degradation in transmission rate. With three RF chains, the performance is close to that of all digital statistical beamforming.
成长策略与外部股东资金来源之关系：集团企业之调节效果
(国立交通大学, 2018-10-01)
林玟廷
;
李佳玲
;
Wen-Ting Lin
;
Chia-Ling Lee
台湾众多企业家成长过程会透过IPO（initial public offering）筹措未来成长资金。对于外部投资者而言，公开上市公司未来成长策略是重要的讯号，牵动投资者投资的信心与意愿。本研究以讯号理论为基础，探讨初次上市公司的成长策略对外产生的讯号效果如何牵动着外部投资者投资的信心与意愿，其中成长策略包含多角化、国际化与研发密集度策略；本研究进一步瞭解初次上市公司成长策略与外部股东资金来源关系是否因集团企业之型态而异。以2000至2012年台湾297家初次上市公司为实证样本，实证发现初次上市公司多角化策略与研究发展会促使公司越有机会从外部取得资金；此外，初次上市公司为集团企业组织型态会调节公司多角化与研发策略与外部股东资金来源之关系。
Efficient Implementation of Boolean and Full-Adder Functions With 1T1R RRAMs for Beyond Von Neumann In-Memory Computing
(2018-10-01)
Wang, Zhuo-Rui
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Li, Yi
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Su, Yu-Ting
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Zhou, Ya-Xiong
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Cheng, Long
In-memory computing architecture is an emerging revolutionary computing paradigm that can break the von Neumann bottleneck. Computing methodology and circuit codesign using the CMOS compatible 1T1R resistive random access memory (RRAM) integration structure is presented in this paper. Functionally complete Boolean logic and arithmetic functions are experimentally demonstrated. With a single 40-nm CMOS process 1T1R unit, each of the 16 binary logics can be realized in two logic steps with an additional readout step for cascading, which shows functional reconfiguration and low computational complexity. Up to 10(7) cycles of NAND and XOR logic operations are performed to validate the correctness and reliability. Moreover, several fundamental adder circuits are designed and experimentally demonstrated in 1T1R devices as the proof of concept of the 1T1R computing architecture. The adders proposed in this paper include a ripple-carry adder and its optimized design and a carry-select adder, which all show promising advantages in nonvolatility, computation speed, and circuit area. This paper reports the most complex yet efficient RRAM-based 8-bit addition function experimentally so far and lays a solid foundation for constructing the future in-memory computing architecture.
具身份辨識功能之非侵入式血糖量測裝置、方法與系統
(2018-10-01)
沈峻任
;
李鎮宜
;
吳家揚
本發明實施例提供一種具身份辨識功能之非侵入式血糖量測裝置，係被使用者所穿戴，其包括PPG信號獲取與特徵擷取裝置、身份識別裝置與血糖分析裝置。PPG信號獲取與特徵擷取裝置用以獲得使用者的PPG信號，對PPG信號進行特徵擷取，以獲得PPG信號的多個特徵值。身份識別裝置連接PPG信號獲取與特徵擷取裝置，依據PPG信號的多個特徵值，識別使用者的身份。血糖分析裝置連接該PPG信號獲取與特徵擷取裝置，依據PPG信號的多個特徵值，計算出使用者的血糖值。
Evaluation and Selection of Materials for Particulate Matter MEMS Sensors by Using Hybrid MCDM Methods
(2018-10-01)
Huang, Chi-Yo
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Chung, Pei-Han
;
Shyu, Joseph Z.
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Ho, Yao-Hua
;
Wu, Chao-Hsin
Air pollution poses serious problems as global industrialization continues to thrive. Since air pollution has grave impacts on human health, industry experts are starting to fathom how to integrate particulate matter (PM) sensors into portable devices; however, traditional micro-electro-mechanical systems (MEMS) gas sensors are too large. To overcome this challenge, experts from industry and academia have recently begun to investigate replacing the traditional etching techniques used on MEMS with semiconductor-based manufacturing processes and materials, such as gallium nitride (GaN), gallium arsenide (GaAs), and silicon. However, studies showing how to systematically evaluate and select suitable materials are rare in the literature. Therefore, this study aims to propose an analytic framework based on multiple criteria decision making (MCDM) to evaluate and select the most suitable materials for fabricating PM sensors. An empirical study based on recent research was conducted to demonstrate the feasibility of our analytic framework. The results provide an invaluable future reference for research institutes and providers.
Digital disparities and vulnerability: mobile phone use, information behaviour, and disaster preparedness in Southeast Asia
(2018-10-01)
Lai, Chih-Hui
;
Chib, Arul
;
Ling, Rich
;
傳播與科技學系
;
Department of Communication and Technology
This paper proposes an ecological view to investigate how disparities in mobile technology use reflect vulnerabilities in communities vis-a-vis disaster preparedness. Data (n=1,603) were collected through a multi-country survey conducted equally in rural and urban areas of Indonesia, Myanmar, Philippines, and Vietnam, where mobile technology has become a dominant and ubiquitous communication and information medium. The findings show that smartphone users' routinised use of mobile technology and their risk perception are significantly associated with disaster preparedness behaviour indirectly through disaster-related information sharing. In addition to disaster-specific social support, smartphone users' disaster-related information repertoires are another strong influencing factor. In contrast, non-smartphone users are likely to rely solely on receipt of disaster-specific social support as the motivator of disaster preparedness. The results also reveal demographic and rural-urban differences in disaster information behaviour and preparedness. Given the increasing shift from basic mobile phone models to smartphones, the theoretical and policy-oriented implications of digital disparities and vulnerability are discussed.