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IEEE/SICE International Symposium on System Integration

作者： Yuki Nishiura Hiroyuki Yamada Ryo Kurazume Graduate School of Information Science and Electrical Engineering Kyushu University Japan Autonomous Control Research Department Center for Sustainability - Connective Automation Hitachi Ltd. Research and Development Group Ibaraki Japan Faculty of Information Science and Electrical Engineering Kyushu University Fukuoka Japan

This paper introduces an information presentation strategy for pedestrians, aiming to enhance traffic efficiency in a mixed pedestrian-automated vehicle environment, such as a public road. While automated driving technology has made remarkable progress, interactions with pedestrians on regular roads have mostly been studied in virtual environments using virtual reality goggles. According to these studies, potential traffic efficiency and safety issues arise from pedestrians' limited understanding of automated vehicle behavior. To address this, we propose a human-machine interface employing a head-mounted display (HMD) to mitigate traffic efficiency degradation caused by pedestrians. The proposed system draws upon behavioral economics principles to encourage pedestrians to modify their behavior and develop better interactions with automated vehicles. Simulations were conducted to identify an information presentation strategy that strongly supports learning, and its effectiveness was further validated through experiments involving a real vehicle. Notably, the experimental results confirmed that the information presentation strategies proven effective in simulations also facilitated pedestrian learning during real-world interactions.

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Growth and magnetoelectric effect of epitaxial Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3(001)

Growth and magnetoelectric effect of epitaxial Co3Mn films o...

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Yuichi Murakami Takamasa Usami Yu Shiratsuchi Yuya Sanada Shinya Yamada Ryoichi Nakatani Kohei Hamaya Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan Center for Spintronics Research Network Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Suita Osaka Japan Spintronics Research Network Division Institute for Open and Transdisciplinary Research Initiatives Osaka University Suita Osaka Japan

We explore epitaxial growth of metastable ferromagnetic Co 3 Mn films on piezoelectric Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (001) (PMN-PT) substrates by molecular beam epitaxy. By tuning the termination of the PMN-PT surface and the growth temperature, thermodynamically metastable bcc and stable fcc/hcp phases can be distinctively formed. We find that the bcc-Co 3 Mn/PMN-PT structure expresses a relatively large converse magnetoelectric (CME) coupling coefficient (α E ) of 8 × 10 -6 s/m while the fcc/hcp-Co 3 Mn/PMN-PT one shows a small value less than 1 × 10 -6 s/m. This provides a possibility for achieving simultaneous demonstration of large CME effect and tunneling magnetoresistance one.

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Computational Fluid Dynamics Analysis of Pollutant Dispersion Around a High-Rise Building: Impact of Surrounding Buildings

SSRN

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SSRN 2023年

作者： Shirzadi, Mohammadreza Tominaga, Yoshihide Chemical Engineering Department Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi Hiroshima Japan Wind and Fluid Engineering Research Center Niigata Institute of Technology Fujihashi Kashiwazaki1719 Japan

Understanding the detailed mechanism of pollutant dispersion in urban areas is a critical aspect of air quality control in residential areas. In this study, wind tunnel measurements and large eddy simulation were used for the analysis of the pollutant dispersion around a high-rise building for an isolated case and also a case when the central high-rise building surrounded several low-rise buildings. The pollutant was released on the leeward façade of the high-rise building at the pedestrian height. The presence of the surrounding buildings significantly alters the pollutant transfer mechanism around the high-rise building. In the surrounded case, the pollutant in the wake region shifted vertically toward the roof of the high-rise building. As a result, at a location of 2/3 of the high-rise building height, the mean concentration is five times larger than the isolated case, which means the residents on higher floors experience more pollution concentration in the case of the surrounded case even though they are located much higher than the canyon rooftop and the pollutant source. In both cases, the contribution of the turbulent diffusive flux in the streamwise direction is comparable with the mean convective flux while they have opposite directions. Detailed analyses of the pollutant mass transfer rate budget around different control volumes around the high-rise buildings highlighted the effect of the surrounding buildings. It is concluded that there is a risk of underestimating pollutant concentrations around a high-rise building, especially near the upper floors if the surrounding buildings are not properly considered. © 2023, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Microstructure of Ni-based hard facing alloy and its polarization behavior in aqueous solution with different pH and chloride concentration

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Corrosion Communications 2021年第3期3卷 1-9页

作者： Rongguang Wang Yasunori Satake Yunhui Li Tian Xiao Masaharu Honda Hideki Fukuhara Seiya Hiramatsu Department of Mechanical Systems Engineering Hiroshima Institute of Technology Graduate School of Science and Technology Hiroshima Institute of Technology Nikko Kosan Co. Ltd. Technical Development Department The Japan Steel Works Ltd.Aki-Ku

To clarify the corrosion behavior of Ni-based hard facing alloy Colmonoy 56 and the preferential dissolution detail at the micrometer scale, the microstructure and the elemental distribution of a rod were analyzed, followed with the polarization measurement in aqueous solution with different p H and Na Cl concentrations. This rod has Fe-, Si-, and Cr-solutioned [Ni] matrix with heterogeneously dispersed secondary phases of Cr23C6, CrB, Cr2B, and Cr5B3. The polarization curve largely changed with different p H: active in acid solution and passive in neutral and alkaline solution. The strongest passivation appeared at p H = 11. Cl-promoted the corrosion attack to the [Ni] matrix. In the case of pH = 11, Cl-caused the fast climb of anodic current from passivation at a less noble potential. Preferential dissolution of the [Ni] matrix occurred in most solutions, except in the case of pH = 14 without Na Cl, in which the secondary phases preferably dissolved.

关键词： Ni-based hard facing alloy Colmonoy 56 Microstructure Polarization pH Chloride concentration

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Mitigating Undesirable Oscillatory Behavior in Barge-type Floating Offshore Wind Turbines through Oscillating Water Columns

Mitigating Undesirable Oscillatory Behavior in Barge-type Fl...

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Payam Aboutalebi Dong Trong Nguyen Aitor J. Garrido Izaskun Garrido Department of Automatic Control and Systems Engineering Engineering School of Bilbao - EIB/BIE Automatic Control Group - ACG University of the Basque Country - UPV/EHU Bilbao Spain Department of Marine Technology Norwegian University of Science and Technology (NTNU) Trondheim Norway

ISBN: (数字)9798350318098

ISBN: (纸本)9798350318104

This paper addresses the challenge of reducing undesired oscillations in barge-type floating wind turbines (FWTs) caused by wind and wave forces, which result in fluctuations in generator power and system oscillations. These oscillations can negatively impact the system’s lifespan, power generation, maintenance costs, and component stress. To mitigate these issues, oscillating water columns (OWCs) are integrated within the FWT substructure. A control strategy is proposed for the OWCs based on response amplitude operators, aiming to minimize oscillations in a 5 MW wind turbine structure. A considered case study is conducted for above-rated wind speeds to evaluate the effectiveness of the controllers and to compare the performance of an uncontrolled FWT against a controlled FWT integrated with OWCs. The findings demonstrate the efficacy of the control strategy in pitch oscillations reducing for 29.9% and generated power fluctuations reducing for 23.03% and highlight the advantages of integrating OWCs in floating offshore wind turbines.

关键词： Vibrations Fluctuations Wind speed Switches Wind power generation Valves control systems

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Linear Encryption Techniques for Counteracting Information-based Stealthy Attacks

Linear Encryption Techniques for Counteracting Information-b...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Jun Shang Hanwen Zhang Weixiong Rao Yiguang Hong Department of Control Science and Engineering National Key Laboratory of Autonomous Intelligent Unmanned Systems Shanghai Institute of Intelligent Sci-ence and Technology Frontiers Science Center for Intelligent Autonomous Systems Tongji University Shanghai China Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing China School of Software Engineering Tongji University Shanghai China

ISBN: (数字)9798331518493

ISBN: (纸本)9798331518509

This study explores linear encryption techniques to protect against information-based stealthy attacks on re-mote state estimation. Utilizing smart sensors equipped with local Kalman filters, the system transmits innovations rather than raw measurements via wireless networks. However, this transmission is susceptible to malicious data interception and manipulation by attackers. To safeguard against these stealthy threats, encryption and decryption modules are integrated into the system. This research aims to assess the effectiveness of the encryption strategy when faced with information-based stealthy attacks. A key contribution of this paper is the adoption of the most comprehensive attack models, moving away from the conventional reliance on innovation-based linear attack models. Our results demonstrate that the proposed linear encryption approach effectively mitigates stealthy attacks under certain mild conditions. The efficacy of the encryption is further validated through numerical examples, corroborating the theoretical advancements presented in this paper.

关键词： Technological innovation Automation Wireless networks Encryption Numerical models Kalman filters State estimation Robots Intelligent sensors

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WARA-PS:a research arena for public safety demonstrations and autonomous collaborative rescue robotics experimentation

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Autonomous Intelligent systems 2021年第1期1卷 104-134页

作者： Olov Andersson Patrick Doherty Mårten Lager Jens-Olof Lindh Linnea Persson Elin A.Topp Jesper Tordenlid Bo Wahlberg Department of Computer and Information Science Linköping UniversityLinköpingSweden Saab Kockums MalmöSweden Division of Decision and Control Systems School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologyStockholmSweden Department of Computer Science Lund UniversityLundSweden Saab Combitech AB LinköpingSweden Division of Automatic Control Department of Electrical EngineeringLinköping UniversityLinköpingSweden

A research arena(WARA-PS)for sensing,data fusion,user interaction,planning and control of collaborative autonomous aerial and surface vehicles in public safety applications is *** objective is to demonstrate scientific discoveries and to generate new directions for future research on autonomous systems for societal *** enabler is a computational infrastructure with a core system architecture for industrial and academic *** includes a control and command system together with a framework for planning and executing tasks for unmanned surface vehicles and aerial *** motivating application for the demonstration is marine search and rescue operations.A state-of-art delegation framework for the mission planning together with three specific applications is also *** first one concerns model predictive control for cooperative rendezvous of autonomous unmanned aerial and surface *** second project is about learning to make safe real-time decisions under uncertainty for autonomous vehicles,and the third one is on robust terrain-aided navigation through sensor fusion and virtual reality tele-operation to support a GPS-free positioning system in marine *** research results have been experimentally evaluated and demonstrated to industry and public sector audiences at a marine test *** would be most difficult to do experiments on this large scale without the WARA-PS research ***,these demonstrator activities have resulted in effective research dissemination with high public visibility,business impact and new research collaborations between academia and industry.

关键词： Autonomous systems Intelligent system architectures Research demonstration arena Autonomous drones Autonomous marine vessels Public safety and security Collaborative robotics

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Robust Voltage Regulation for DC Microgrids via Passivity-Based Sliding Mode control

Robust Voltage Regulation for DC Microgrids via Passivity-Ba...

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International Workshop on Variable Structure systems, VSS

作者： Edoardo Vacchini Michele Cucuzzella Pablo Borja Antonella Ferrara Department of Electrical Computer and Biomedical Engineering University of Pavia Pavia Italy Jan C. Willems Center for Systems and Control Engineering and Technology Institute Groningen (ENTEG) Faculty of Science and Engineering University of Groningen Groningen The Netherlands School of Engineering Computing and Mathematics University of Plymouth Plymouth U.K.

ISBN: (数字)9798350353686

ISBN: (纸本)9798350353693

This paper proposes a decentralized sliding mode control approach to the voltage regulation problem in a DC microgrid consisting of distributed generation units interconnected with each other through resistive-inductive power lines and supplying unknown nonlinear loads. In particular, the port-Hamiltonian structure of the system suggests the design of a suitable sliding manifold such that the system on this manifold exhibits desired passivity properties. This approach simplifies the control design and relaxes some restrictive assumptions required by other controllers proposed in the literature, while offering satisfactory performance.

关键词： Manifolds Variable structure systems Power transmission lines Microgrids Power system stability Stability analysis Robustness Reduced order systems Voltage control Sliding mode control

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Distributed Non-Bayesian Learning for Games with Incomplete Information

arXiv

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arXiv 2023年

作者： Huang, Shijie Lei, Jinlong Hong, Yiguang Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences China School of Mathematical Sciences University of Chinese Academy of Sciences China Department of Control Science and Engineering Shanghai Research Institute for Intelligent Autonomous Systems Tongji University China

We consider distributed learning problem in games with an unknown cost-relevant parameter, and aim to find the Nash equilibrium while learning the true parameter. Inspired by the social learning literature, we propose a distributed non-Bayesian rule to learn the parameter (each agent maintains a belief on the parameter and updates the belief according to the received noisy cost), combined with best response dynamics for strategy update. The difficulty of the analysis lies mainly in the fact that the parameter learning process and strategy update process are coupled. We first prove that agents' beliefs converge to a common belief and the strategy profiles converge to a Nash equilibrium under this common belief. On this basis, we further show that the beliefs eventually concentrate on the true parameter. Copyright © 2023, The Authors. All rights reserved.

关键词： Game theory

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Accelerating Convolutional Neural Networks via Inter-operator Scheduling

Accelerating Convolutional Neural Networks via Inter-operato...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Yi You Pangfeng Liu Ding-Yong Hong Jan-Jan Wu Wei-Chung Hsu Department of Computer Science and Information Engineering National Taiwan University Graduate Institute of Networking and Multimedia National Taiwan University Graduate School of Advanced Technology National Taiwan University Institute of Information Science Academia Sinica

Convolution neural networks (CNNs) are essential in many machine learning tasks. Current deep learning frameworks and compilers usually treat the neutral network as a DAG (directed acyclic graph) of tensor operations and execute them one at a time according to a topological order, which respects the dependency in the DAG. There are two issues with this general approach. First, new CNNs have branch structures, and they form complex DAGs. These DAGs make it hard to find a good topology sort order that schedules operators within a GPU. Second, modern hardware has high computational power, which makes running operators sequentially on modern hardware under-utilizes resources. These two issues open the possibility of exploiting inter-operator parallelism, i.e., parallelism among independent operators in the DAG, to utilize the hardware resources more efficiently. In this work, we formally define the DAG scheduling problem that addresses the resource contention and propose an early-start-time-first algorithm with two heuristic rules for exploiting parallelism between independent operators. Experimental results show that our method improves the performance by up to 3.76× on RTX 3090 compared to the sequential execution.

关键词： Schedules Tensors Processor scheduling Heuristic algorithms Graphics processing units Parallel processing Hardware

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