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SSRN 2023年

作者： Tokoroyama, Takayuki Fujiwara, Chiho Murashima, Motoyuki Yamaguchi, Makoto Umehara, Noritsugu Department of Micro-Nano Mechanical Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8603 Japan Department of Mechanical Systems Engineering Graduate School of Engineering Tohoku University 6-6-01 Aramaki-aza-aoba Aoba-ku Sendai980-8579 Japan Graduate School of Engineering Science Faculty of Engineering Science Akita University 1-1 Tegata Gakuen-machi Akita010-8502 Japan

Polarized surface-enhanced Raman scattering was applied to low- and high- friction surfaces of tetrahedral amorphous carbon nitride (ta-CNx) to reveal the presence of the graphite structure and investigate the angular dependence of the graphite domains that formed on the topmost surface. The measured D peak intensity differed along the incident electric field toward the sliding direction, from parallel to perpendicular and armchair edges may be present. The results for the low- friction surface indicated that graphite domains exist on the ta-CNx disk and transfer layer on the counter material (Si3N4) ball in directions different from the sliding friction, which suggests an incommensurate configuration. © 2023, The Authors. All rights reserved.

关键词： Silver nanoparticles

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AN EXTENDED SYMMETRIC UNION AND ITS ALEXANDER POLYNOMIAL

arXiv

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arXiv 2025年

作者： Kitano, Teruaki Nakae, Yasuharu Department of Information Systems Science Faculty of Science and Engineering Soka University Tangi-machi 1-236 Hachioji Tokyo192-8577 Japan Graduate School of Engineering Science Akita University 1-1 Tegata Gakuenmachi Akita Akita010-8502 Japan

For prime knots K1 and K2, we write K1 ≥ K2 if there is an epimorphism from the knot group of K1 to that of K2 which preserves the meridian. We construct a family of pairs of knots with K1 ≥ K2 such that an epimorphism maps the longitude of K1 to the trivial element. This construction is regarded as an extension of a symmetric union with a single full twisted region. In particular, it extends a property of the Alexander polynomial of a symmetric union. We also exhibit that all but two of the knots up to ten crossings in the list of Kitano-Suzuki, which have an epimorphism mapping the longitude to the trivial element, arise from this *** Codes Primary 57K10, Secondary 57M05 © 2025, CC BY.

关键词： Polynomials

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Trends, Opportunities, and Challenges in Detecting Depressive Disorders Through Mobile Devices: A Review 2

Trends, Opportunities, and Challenges in Detecting Depressiv...

引用

2nd International Conference on Computer System, Information Technology, and Electrical engineering, COSITE 2023

作者： Elwirehardja, Gregorius Natanael Isnan, Mahmud Perbangsa, Anzaludin Samsinga Muchtar, Kahlil Pardamean, Bens Computer Science Department School of Computer Science Bina Nusantara University Jakarta11480 Indonesia Mahmud Isnan Bioinformatics and Data Science Research Center Bina Nusantara University Jakarta11480 Indonesia Information System Department School of Information Systems Bina Nusantara University Jakarta11480 Indonesia Department of Electrical and Computer Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Computer Science Department BINUS Graduate Program-Master of Computer Science Bina Nusantara University Jakarta11480 Indonesia

ISBN: (纸本)9798350343069

Depressive Disorders (DD) is one of the most prevalent mental disorders in the world that may lead to suicide cases. To prevent the latter, ubiquitous early detection systems may be effective. Recent studies have since researched the development of such systems by exploiting several forms of data, including video, audio, Ecological Momentary Assessments (EMA), and passive sensing data using sensors embedded in mobile devices. To summarize the trends, opportunities, and existing challenges in this field, this study reviewed 15 papers to answer four research questions. EMA was the most popular data to be used in this task, but other approaches, such as using video, audio, and typing behaviors, may be considered due to the subjectivity of EMA. These data were typically recorded using smartphones and analyzed using Machine Learning (ML). However, most of the developed systems had yet to be implemented. Overall, it was concluded that further studies may need to explore usages of more objective data in multimodal approaches as well as consider using Mobile Cloud Computing (MCC) to deploy these systems to provide more effective and efficient diagnoses. Future studies must also take into account the existing challenges of the data and infrastructures, such as the weaknesses of several data types, limitations of mobile devices, as well as the challenges of diagnosis approaches. © 2023 IEEE.

关键词： Machine learning

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A Duality-Based Approach to Inverse Kalman Filtering

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IFAC-PapersOnLine 2023年第2期56卷 10258-10263页

作者： Yibei Li Bo Wahlberg Lihua Xie Xiaoming Hu School of Electrical and Electronic Engineering Nanyang Technological University Singapore Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm Sweden Division of Optimization and Systems Theory Department of Mathematics KTH Royal Institute of Technology Stockholm Sweden

In this paper, the inverse Kalman filtering problem is addressed using a duality-based framework, where certain statistical properties of uncertainties in a dynamical model are recovered from observations of its posterior estimates. The duality relation in inverse filtering and inverse optimal control is established. It is shown that the inverse Kalman filtering problem can be solved using results from a well-posed inverse linear quadratic regulator. Identifiability of the considered inverse filtering model is proved and a unique covariance matrix is recovered by a least squares estimator, which is also shown to be statistically consistent. Effectiveness of the proposed methods is illustrated by numerical simulations.

关键词： Inverse filtering Kalman filters duality covariance estimation identifiability

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Consistent and Asymptotically Statistically-Efficient Solution to Camera Motion Estimation

arXiv

引用

arXiv 2024年

作者： Zeng, Guangyang Zeng, Qingcheng Li, Xinghan Mu, Biqiang Chen, Jiming Shi, Ling Wu, Junfeng The School of Data Science Chinese University of Hong Kong Shenzhen Shenzhen518172 China The College of Control Science and Engineering The State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou310027 China Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China The Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong

Given 2D point correspondences between an image pair, inferring the camera motion is a fundamental issue in the computer vision community. The existing works generally set out from the epipolar constraint and estimate the essential matrix, which is not optimal in the maximum likelihood (ML) sense. In this paper, we dive into the original measurement model with respect to the rotation matrix and normalized translation vector and formulate the ML problem. We then propose a two-step algorithm to solve it: In the first step, we estimate the variance of measurement noises and devise a consistent estimator based on bias elimination;In the second step, we execute a one-step Gauss-Newton iteration on manifold to refine the consistent estimate. We prove that the proposed estimate owns the same asymptotic statistical properties as the ML estimate: The first is consistency, i.e., the estimate converges to the ground truth as the point number increases;The second is asymptotic efficiency, i.e., the mean squared error of the estimate converges to the theoretical lower bound - Cramer-Rao bound. In addition, we show that our algorithm has linear time complexity. These appealing characteristics endow our estimator with a great advantage in the case of dense point correspondences. Experiments on both synthetic data and real images demonstrate that when the point number reaches the order of hundreds, our estimator outperforms the state-of-the-art ones in terms of estimation accuracy and CPU time. Copyright © 2024, The Authors. All rights reserved.

关键词： Maximum likelihood estimation

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Analysis of Feature Parameters and Their Time-Transition for Shockable Arrhythmia and Prediction of the Effect of Electrical Defibrillation

Analysis of Feature Parameters and Their Time-Transition for...

引用

On-Line Conference (ONCON), Industrial Electronics Society Annual

作者： Shunta Noguchi Yuta Yoshikawa Takayuki Okai Hidetoshi Oya Md. Masudur Rahman Minoru Yoshida Graduate School of Integrative Science and Engineering Tokyo City University Tokyo Japan Department of Computer Science Tokyo City University Tokyo Japan Department of Information and Communication Engineering Noakhali Science and Technology University Bangladesh Department of Applied Systems and Mathematics Kanagawa University Kanagawa Japan

ISBN: (数字)9798331540319

ISBN: (纸本)9798331540326

In this paper, we propose a prediction system of the effect of electrical defibrillation. In order to develop the proposed system, we firstly analyze from pre-shock (immediately before defibrillation) ECGs (ElectroCardioGrams) by using Gabor Wavelet Transform, Poincaré plot analysis, Spectral entropy, and feature parameters are extracted by those extracted analysis results, we focus on time-transition feature parameter. Next, effective feature parameters are selected based on $\chi^{2}$ -test. Finally, “Effective” and “Ineffective” for electrical defibrillation are classified by using SVM (Support Vector Machine) with three kernels (Linear, Gaussian, and Polynomial) and regularization. In this way, we shows the effectiveness of the proposed feature extraction methods and prediction system.

关键词： Wavelet transforms Support vector machines Accuracy Arrhythmia Electrocardiography Feature extraction Wavelet analysis Entropy Defibrillation Kernel

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"Hydrogen and Materials Characteristic in Solids V"

引用

Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 2023年第4期87卷 95-95页

作者： Ichikawa, Takayuki Miyaoka, Hiroki Hino, Makoto Horikawa, Keitaro Kanadani, Teruto Graduate School of Advanced Science and Engineering Hiroshima University Higashi Hiroshima739–8527 Japan Natural Science Center for Basic Research and Development Hiroshima University Higashi Hiroshima739–8530 Japan Department of Mechanical Systems Engineering Faculty of Engineering Hiroshima Institute of Technology Hiroshima731–5193 Japan Department of Mechanical Science and Bioengineering Graduate School of Engineering Science Osaka University Toyonaka560–8531 Japan Faculty of Engineering Okayama University of Science Okayama700–0005 Japan

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Creating Thermally Stable P-Type Carbon Nanotubes Via Coordination Chemistry For Thermoelectric Materials

Creating Thermally Stable P-Type Carbon Nanotubes Via Coordi...

引用

Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

作者： Kaho Kawasaki Yasuko Koshiba Kouki Akaike Qingshuo Wei Masahiro Funahashi Kenji Ishida Shohei Horike Department of Chemical Science and Engineering Graduate School of Engineering Kobe University JAPAN Research Center for Membrane and Film Technology Kobe University JAPAN Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) JAPAN Graduate School of Pure and Applied Science University of Tsukuba JAPAN Department of Applied Quantum Physics and Nuclear Engineering Faculty of Engineering Kyushu University JAPAN Center for Environmental Management Kobe University Japan

ISBN: (数字)9798350380200

ISBN: (纸本)9798350380217

Carbon nanotube (CNT)-based thermoelectric (TE) materials have the potential to be used for the recovery of low-grade thermal energy. As TE devices are placed on heat sources, thermal stability of the materials-especially, retention ability of the doped states of CNTs- is one of the most important issues. Here, we show that the dopant selection via coordination chemistry allowed for establishing the stable p-doped CNTs lasting for more than 2 years at $100^{\circ} \mathrm{C}$ in air. Based on the less fluctuation of TE power factors of the doped CNTs, our results offer a promising avenue for creating CNT-based TE devices.

关键词： Reactive power Thermal expansion Thermoelectric materials Chemistry Power system stability Conductivity Carbon nanotubes Thermal sensors Thermal stability Thermal energy

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A data-driven CLF controller based on a kriged predictor

A data-driven CLF controller based on a kriged predictor

引用

IEEE Conference on Decision and control

作者： A. Daniel Carnerero Daniel R. Ramirez Takeshi Hatanaka Teodoro Alamo Graduate School of Engineering Science Osaka University Toyonaka Japan Departamento de Ingeniería de Sistemas y Automática Universidad de Sevilla Escuela Superior de Ingenieros Camino de los Descubrimientos s/n Sevilla Spain Department of Systems and Control Engineering School of Engineering Tokyo Institute of Technology Tokyo Japan

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

In this paper, we present a data-driven methodology to predict and control the behaviour of nonlinear and non-autonomous systems based on kernel functions. The technique computes the forecasting by means of a linear combination of past data. The weights used to compute the prediction are obtained by solving a convex optimization problem that stems from a novel kriging formulation. A control Lyapunov Function (CLF) based controller using the presented predictor is also built. Finally, numerical examples of both prediction and control are presented, showing the efficacy of the proposed approach.

关键词： Asymptotic stability Noise Convex functions Noise measurement Nonlinear systems Kernel Forecasting Lyapunov methods

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Parametric Transformation of Timed Weighted Marked Graphs:Applications in Optimal Resource Allocation

引用

IEEE/CAA Journal of Automatica Sinica 2021年第1期8卷 179-188页

作者： Zhou He Ziyue Ma Zhiwu Li Alessandro Giua the College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi’an University of TechnologyXi’an 710048China the School of Electro-Mechanical Engineering Xidian UniversityXi’an 710071China Institute of Systems Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina the Department of Electrical and Electronic Engineering University of CagliariCagliari 09124Italy

Timed weighted marked graphs are a subclass of timed Petri nets that have wide applications in the control and performance analysis of flexible manufacturing *** to the existence of multiplicities(i.e.,weights)on edges,the performance analysis and resource optimization of such graphs represent a challenging *** this paper,we develop an approach to transform a timed weighted marked graph whose initial marking is not given,into an equivalent parametric timed marked graph where the edges have unitary *** order to explore an optimal resource allocation policy for a system,an analytical method is developed for the resource optimization of timed weighted marked graphs by studying an equivalent ***,we apply the proposed method to a flexible manufacturing system and compare the results with a previous heuristic *** analysis shows that the developed approach is superior to the heuristic approach.

关键词： Discrete event system resource allocation timed Petri net weighted marked graph

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