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Automated stopping criterion for spectral measurements with active learning

npj Computational Materials 2021年第1期7卷 1252-1260页

作者： Tetsuro Ueno Hideaki Ishibashi Hideitsu Hino Kanta Ono Synchrotron Radiation Research Center Kansai Photon Science InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and TechnologySayoHyogoJapan Department of Human Intelligence Systems Graduate School of Life Science and Systems EngineeringKyushu Institute of TechnologyKitakyushuFukuokaJapan The Institute of Statistical Mathematics Research Organization of Information and SystemsTachikawaTokyoJapan Department of Applied Physics Graduate School of EngineeringOsaka UniversitySuitaOsakaJapan Center for Integrative Quantum Beam Science Institute of Materials Structure ScienceHigh Energy Accelerator Research OrganizationTsukubaIbarakiJapan

The automated stopping of a spectral measurement with active learning is *** optimal stopping of the measurement is realised with a stopping criterion based on the upper bound of the posterior average of the generalisation error of the Gaussian process *** is revealed that the automated stopping criterion of the spectral measurement gives an approximated X-ray absorption spectrum with sufficient accuracy and reduced data *** proposed method is not only a proof-of-concept of the optimal stopping problem in active learning but also the key to enhancing the efficiency of spectral measurements for highthroughput experiments in the era of materials informatics.

关键词： criterion spectral optimal

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Structural health monitoring: Frequency domain analysis of beam with breathing crack 2

Structural health monitoring: Frequency domain analysis of b...

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2nd International Conference on Biospheric Harmony Advanced Research, ICOBAR 2020

作者： Gunawan, F.E. Kanto, Y. Kamil, I. Sutikno Tran, H.N. Industrial Engineering Department BINUS Graduate Program-Master of Industrial Engineering Bina Nusantara University Jakarta11480 Indonesia Mechanical Systems Engineering College of Engineering Ibaraki University Ibaraki Japan Department of Industrial Faculty of Engineering Andalas University Padang Indonesia Department of Mechanical Engineering Department Faculty of Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia Department of Automotive Engineering Faculty of Transportation Engineering Ho Chi Minh City University of Technology Ho Chi Minh City Viet Nam

Structural Health Monitoring (SHM) system can be considered as an Internet-of-Things (IoT) system implemented to engineering structure to provide real-time information on the integrity of the structure. In doing so, the system acquires data from various sensors distributed across the structure and infers damage sensitive quantities. In the research, we proposed a damage index derived from the governing dynamics of the structure in the frequency domain. The proposal was empirically verified by applying the index to analyze the case of a cracked cantilever beam subjected to a harmonic load. The value of the damage index was computed at some points surrounding the crack to understand the effect of the distance of the monitoring point to the crack to the index sensitivity. The results suggest that the index is sensitive to the crack particularly when the observation point is near the crack. © Published under licence by IOP Publishing Ltd.

关键词： Internet of things

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Controlling Circularly Polarized Luminescence Using Helically Structured Chiral Silica as a Nanosized Fused Quartz Cell

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JACS Au 2023年第10期3卷 2698-2702页

作者： Sakai, Hinari Yung, Tsz-Ming Mure, Tomoki Kurono, Naoki Fujii, Syuji Nakamura, Yoshinobu Hayakawa, Teruaki Li, Ming-Chia Hirai, Tomoyasu Department of Applied Chemistry Faculty of Engineering and Graduate School of Engineering Osaka Institute of Technology 5-16-1 Omiya Asahi-ku Osaka 535-8585 Japan Department of Biological Science and Technology Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B) National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan Department of Materials Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1-S8-36 Ookayama Tokyo Meguro-ku 152-8552 Japan

Circularly polarized luminescence (CPL) is typically achieved with a chiral luminophore. However, using a helical nanosized fused quartz cell consisting of chiral silica, we could control the wavelength and helical sense of the CPL of an achiral luminophore. Chiral silica with a helical nanostructure was prepared by calcining a mixture of polyhedral oligomeric silsesquioxane (POSS)-functionalized isotactic poly(methacrylate) (it-PMAPOSS) and a small amount of chiral dopant. The chiral silica encapsulated functional molecules, including luminophores, along the helical nanocavity, leading to induced circular dichroism (ICD) and induced circularly polarized luminescence (iCPL). Because chiral silica can act as a helical nanosized fused quartz cell, it can encapsulate not only the luminophore but also solvent molecules. By changing the solvent in the luminophore-containing nanosized fused quartz cell, the wavelength of the CPL was controlled. This method provides an effective strategy for designing novel CPL-active materials. © 2023 The Authors. Published by American Chemical Society.

关键词： circularly polarized luminescence helical structure polyhedral oligomeric silsesquioxane quartz cell silica stereoregularity

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Design of Lock/Unlock Controllable Joint for Wire-driven Robotic Arms

Design of Lock/Unlock Controllable Joint for Wire-driven Rob...

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IEEE International Conference on Real-time Computing and Robotics (RCAR)

作者： Yang Zhang Zaiyang Liu Atsushi Kakogawa Yang Tian Shugen Ma Zhongkui Wang Graduate School of Science and Engineering Ritsumeikan University Shiga Japan Department of Robotics Ritsumeikan University Shiga Japan Robotics and Autonomous Systems Thrust Systems Hub The Hong Kong University of Science and Technology (Guangzhou) Guangzhou China

ISBN: (数字)9798350372601

ISBN: (纸本)9798350372618

Wire-driven robotic arms are characterized by high redundancy and a high length-to-diameter ratio, enabling them to navigate and explore effectively in confined environments by controlling and changing their configurations timely, such as during internal reactor inspections following accidents at nuclear facilities. Their flexibility is achieved by changing the configurations of the robotic arms, which can be controlled by using multiple wires in each segment for control, or by using combinations with fewer wires and lock/unlock joint mechanisms. Such mechanisms (e.g., latch) have some limitations in terms of control, energy, response, and long-term reliability. To address, we designed a lock/unlock controllable joint for wire-driven robotic arms using the electromagnetic brake, which can improve the joint capability. This preliminary study progressed through prototype design, control system design, and preliminary testing. We analyzed the challenges associated with existing wire-driven robotic arms with lock/unlock joints. A prototype and control system were then designed and preliminarily tested. Based on the results, the usability of this joint was discussed. This preliminary study laid the groundwork for the subsequent optimization of wire-driven robotic arms.

关键词： program processors Wires Redundancy Prototypes Arms Manipulators Real-time systems

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The Bibliometric Analysis of Electricity Generation from Floating Solar

The Bibliometric Analysis of Electricity Generation from Flo...

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Conference on Power, Energy and Innovations (ICPEI)

作者： Narongsak Jornsanoh Suparatchai Vorarat Watcharapong Tantawat Prayuth Rittidatch Graduate Program in Engineering Management Dhurakij Pundit University Bangkok Thailand Renewable Energy Department Tractebel Engineering Ltd. Bangkok Thailand Physical Management Division Dhurakij Pundit University Bangkok Thailand

Floating solar systems are renewable energy technology in which the solar modules are not installed on the roof or the ground-mounted but rather float on water bodies. These are some advantages, particularly in areas with limited space. Compared to conventional solar power plants, floating modules have additional advantages, such as reducing the evaporation water losses and operating more efficiently, causing the temperature of solar modules to decrease. This research aimed to investigate previous journal articles, conference proceedings, and books from ScienceDirect, Scopus, and IEEE databases. Therefore, It spans ten years, beginning in 2013 and ending in 2023. The main keywords “Floating Solar,” Floating PV,” and “Floating photovoltaics,” which were analyzed using a bibliometric program and graphs, are used to present the results of their analysis.

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Adaptive Decentralized Asymptotic Tracking Control for Large-Scale Nonlinear systems With Unknown Strong Interconnections

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IEEE/CAA Journal of Automatica Sinica 2022年第1期9卷 173-186页

作者： Ben Niu Jidong Liu Ding Wang Xudong Zhao Huanqing Wang College of Information Science and Engineering Shandong Normal UniversityJinan 250014China School of Artificial Intelligence Nankai UniversityTianjin 300071China Faculty of Information Technology Beijing University of TechnologyBeijing 100124 State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Control Science and Engineering Dalian University of TechnologyDalian 116023China Department of Mathematical Science and Automatization Institute Bohai UniversityJinzhou 121000China

An adaptive decentralized asymptotic tracking control scheme is developed in this paper for a class of large-scale nonlinear systems with unknown strong interconnections,unknown time-varying parameters,and ***,by employing the intrinsic properties of Gaussian functions for the interconnection terms for the first time,all extra signals in the framework of decentralized control are filtered out,thereby removing all additional assumptions imposed on the interconnec-tions,such as upper bounding functions and matching ***,by introducing two integral bounded functions,asymptotic tracking control is ***,the nonlinear filters with the compensation terms are introduced to circumvent the issue of“explosion of complexity”.It is shown that all the closed-loop signals are bounded and the tracking errors converge to zero *** the end,a simulation example is carried out to demonstrate the effectiveness of the proposed approach.

关键词： Adaptive decentralized control asymptotic tracking control large-scale nonlinear systems unknown strong interconnections

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Synthetic helicoidal rotation of a quasielectrostatic ring resonator for ultrabroadband magnet-free nonreciprocity

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Physical Review Applied 2024年第6期22卷 064020-064020页

作者： Aravind Nagulu Ahmed Mekawy Mykhailo Tymchenko Dimitrios Sounas Harish Krishnaswamy Andrea Alù Department of Electrical and Systems Engineering Washington University in St. Louis St. Louis Missouri 63130 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Department of Electrical Engineering Wayne State University Detroit Michigan 48202 USA Department of Electrical Engineering Columbia University New York New York 10027 USA Physics Program Graduate Center City University of New York New York New York 10016 USA

Suitably tailored forms of spatiotemporal modulation in electronic circuit networks have been recently employed to overcome fundamental challenges in modern electronic systems, including breaking reciprocity, squeezing the footprint of high-Q resonators, and overcoming the delay-bandwidth limit. Rotating patterns of temporal modulations have been used to synthesize angular momentum, which replaces magnetic bias to break reciprocity in integrated circuits. However, this approach is limited by trade-offs between modulation speed, footprint, and bandwidth of operation. Rotating switching patterns in commutated capacitor networks also enables compact filters and quasielectrostatic wave propagation, overcoming the delay-bandwidth limit. In this paper, we combine these mechanisms in an integrated-circuit ring that synthetically rotates in two dimensions, realizing an effective helicoidal motion that provides ultrabroadband quasielectrostatic nonreciprocal responses fitting within a theoretically infinitesimal size. We also analyze the impact of modulation signal noise on time-modulated nonreciprocal components and unveil the role of a dynamic noise mechanism based on which the noise level increases in the presence of a strong signal passing through the component, along with methods to mitigate this effect. We experimentally verify these principles in a three-port integrated circulator based on a 65-nm CMOS process that operates from dc to 1 GHz with a miniaturization factor of 2 × 106.

关键词： Metamaterials Non-reciprocal transmission Photonics Topolectrical circuits

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Analysis of Space Debris Mitigation and Removal Techniques for Small Satellites in Low Earth Orbit in Purview of the Guidelines Issued by the FCC 74

Analysis of Space Debris Mitigation and Removal Techniques f...

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74th International Astronautical Congress, IAC 2023

作者： Baranwal, Prerna Rotheram, Eugene Mardhani, Simran Harshini, S.R. Jose, Diya Jouini, Oussema Judson, Vineel Eslavath, Bhoopathi Sai Naik Ferguson, Alexander Hope Ferdinand Mohanty, Joshit Gamal, Hamed Waterman, Alison Wischert, Daniel c/o European Space Policy Institute Schwarzenbergplatz 6 Vienna1030 Austria Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore117543 Singapore Department of Mechanical Engineering Kwame Nkrumah University of Science and Technology KumasiMC69+P2P Ghana Department of Engineering Management and Systems Engineering Old Dominion University 5115 Hampton Blvd NorfolkVA23529 United States Mynaric Dornierstraße 19 Gilching82205 Germany

As the number of space launches and missions increases exponentially, so does the amount of space debris in orbit. This poses a serious threat to spacecraft and astronauts, as even small fragments travelling at high speeds can cause considerable damage upon impact and may eventually lead to Kessler Syndrome. European Space Agency's (ESA) space debris mitigation handbook, Indian Space Research Organisation's (ISRO) Network for Space Objects Tracking and Analysis (NETRA), and National Aeronautics and Space Administration's (NASA) Orbital Debris program Office (ODPO) are some of the measures put in place by governmental agencies to tackle this problem. However, ongoing efforts are still needed to effectively manage the increasing accumulation of space debris. This research assesses the impact of the 2022 Federal Communications Commission (FCC) ruling that mandates satellites operating in Low Earth Orbit (LEO) to be de-orbited within five years of mission completion instead of the previous twenty-five-year limit. With a two-year transition period for the small satellite industry, the study focuses on the effect of this ruling on small satellites, especially satellite constellations, by analyzing the cost-effectiveness, technological readiness level, advantages, and disadvantages of space debris mitigation measures and removal techniques. The research investigates different methods for eliminating orbital debris, such as controlled atmospheric re-entry, acceleration of natural spacecraft decay, relocation to graveyard orbits, active debris removal, and processes to prevent collisions between non-maneuverable objects. It also delves into space debris mitigation techniques like just-in-time collision avoidance (JCA) and the management of traffic generated by large debris. The study concludes by providing a roadmap for small satellite developers to adopt optimal space debris removal and mitigation techniques for their proposals. The analysis is conducted by a team of volunt

关键词： FCC Guidelines Small Satellites Space Debris Mitigation Space Debris Removal

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Research Alignment in the U.S. National Parks System: Impact of Transformative Science Policy on the Supply of Scientific Knowledge for Protected Area management

SSRN

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SSRN 2024年

作者： Arroyave, Felber J. Jenkins, Jeffrey Shackelton, Steve Jackson, Breeanne Petersen, Alexander M. Department of Management of Complex Systems School of Engineering University of California MercedCA United States National Parks Institute Ernest and Julio Gallo Management Program School of Engineering University of California MercedCA United States Yosemite Field Station Natural Reserve System University of California WawonaCA United States

The US national parks system encompasses diverse environmental and tourism management regimes, together governed by the 1916 Organic Act and its dual mandate of conservation and provision of public enjoyment. However, with the introduction of transformative science policy in the 2000’s, the mission scope has since expanded to promote overarching science-based objectives. Yet despite this paradigm shift instituting "science for parks, parks for science", there is scant research exploring the impact of the national parks science policy on the provision of knowledge. We address this gap by developing a spatiotemporal framework for evaluating research alignment, here operationalized via quantifiable measures of supply and demand for scientific knowledge. Specifically, we apply a machine learning algorithm (Latent Dirichlet analysis) to a comprehensive park-specific text corpus (combining official needs statements -demand- and scientific research metadata -supply-) to define a joint topic space, which thereby facilitates quantifying the direction and degree of alignment at multiple levels. Results indicate an overall robust degree of research alignment, with misaligned topics tending to be over-researched (as opposed to over-demanded), which may be favorable to many parks, but is inefficient from the park system perspective. Results further indicate that the transformative science policy exacerbated the misalignment in mandated research domains. In light of these results, we argue for improved decision support mechanisms to achieve more timely alignment of research efforts towards distinctive park needs, thereby fostering convergent knowledge co-production and leveraging the full value of national parks as living laboratories. © 2024, The Authors. All rights reserved.

关键词： Sustainable development

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LayOut Loud: An AI-Powered Augmented Reality and Mobile Application for Room Interior Design and Layout Optimization

LayOut Loud: An AI-Powered Augmented Reality and Mobile Appl...

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Intelligent Cybernetics Technology & Applications (ICICyTA), International Conference on

作者： John Raphael G. Cuevas John Kenneth R. Rili Anny Neolicia G. Santillan Vivien A. Agustin Mary Grace N. Gonzales Criselle J. Centeno Richard C. Regala Department of Information Technology College of Information Systems and Technology Management Pamantasan ng Lungsod ng Maynila Manila Philippines Department of Computer Science Associate Dean of College of Information Systems and Technology Management Pamantasan ng Lungsod ng Maynila Manila Philippines Department of Information Technology Faculty of College of Engineering and Technology Pamantasan ng Lungsod ng Maynila Manila Philippines Department of Information Technology Director of Graduate Program of College of Information Systems and Technology Management Pamantasan ng Lungsod ng Maynila Manila Philippines Department of Computer Science Computer Lab Administrator of College of Engineering and Technology Pamantasan ng Lungsod ng Maynila Manila Philippines

ISBN: (数字)9798331506490

ISBN: (纸本)9798331506506

LayOut Loud is an AI-powered augmented reality (AR) and mobile application designed to revolutionize room interior design by offering tailored, real-time solutions for layout optimization. The primary objective of this tool is to design AI-powered features that analyze user-provided room dimensions, furniture types, and style preferences. By leveraging advanced algorithms, LayOut Loud generates personalized design suggestions that cater to the individual needs and aesthetic tastes of users, ensuring that each interior design experience is customized and unique. A key goal of the application is to enhance user experience and decision-making through a clustering algorithm. This algorithm categorizes furniture pieces based on their suitability and appearance in living spaces, streamlining the selection process for users. By enabling the visualization of these items in a 3D model, users can make informed decisions about their interior design choices, ensuring that each piece contributes to the overall aesthetic and functional harmony of the space. Additionally, LayOut Loud focuses on improving its AR capabilities by allowing users to capture their room layouts and view virtual furniture arrangements in real time. This feature provides practical, interactive design solutions, empowering users to experiment with different configurations and instantly see how potential changes would appear in their actual living environments. Ultimately, LayOut Loud offers a user-friendly, immersive platform that transforms the way individuals approach interior design.

关键词： Solid modeling Three-dimensional displays Layout Decision making Clustering algorithms Real-time systems User experience Mobile applications Augmented reality Optimization

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