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arXiv 2021年

作者： Ogawa, Kazuhisa Abe, Natsuki Kobayashi, Hirokazu Tomita, Akihisa Graduate School of Information Science and Technology Hokkaido University Sapporo060-0814 Japan School of System Engineering Kochi University of Technology Tosayamada-cho Kochi782-8502 Japan

The variance of an observable in a pre-selected quantum system, which is always real and non-negative, appears as an increase in the probe wave packet width in indirect measurements. Extending this framework to pre- and post-selected systems, we formulate a complex-valued counterpart of the variance called "weak variance." In our formulation, the real and imaginary parts of the weak variance appear as changes in the probe wave packet width in the vertical-horizontal and diagonal-antidiagonal directions, respectively, on the quadrature phase plane. Using an optical system, we experimentally demonstrate these changes in the probe wave packet width caused by the real negative and purely imaginary weak variances. Furthermore, we show that the weak variance can be expressed as the variance of the weak-valued probability distribution in pre- and post-selected systems. These operational and statistical interpretations support the rationality of formulating the weak variance as a complex counterpart of the variance in pre- and post-selected systems. Copyright © 2021, The Authors. All rights reserved.

关键词： Wave packets

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Direct measurement of ultrafast temporal wavefunctions

arXiv

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arXiv 2021年

作者： Ogawa, Kazuhisa Okazaki, Takumi Kobayashi, Hirokazu Nakanishi, Toshihiro Tomita, Akihisa Graduate School of Information Science and Technology Hokkaido University Sapporo060-0814 Japan School of System Engineering Kochi University of Technology Kochi782-8502 Japan Department of Electronic Science and Engineering Kyoto University Kyoto615-8510 Japan

The large capacity and robustness of information encoding in the temporal mode of photons is important in quantum information processing, in which characterizing temporal quantum states with high usability and time resolution is essential. We propose and demonstrate a direct measurement method of temporal complex wavefunctions for weak light at a single-photon level with subpicosecond time resolution. Our direct measurement is realized by ultrafast metrology of the interference between the light under test and self-generated monochromatic reference light;no external reference light or complicated post-processing algorithms are required. Hence, this method is versatile and potentially widely applicable for temporal state characterization. Copyright © 2021, The Authors. All rights reserved.

关键词： Particle beams

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Modeling and Experimental Verification of a New Spherical Underwater Robot 17

Modeling and Experimental Verification of a New Spherical Un...

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17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： An, Ruochen Guo, Shuxiang Zheng, Liang Awa, Tendeng Sui, Wenbo Kagawa University Graduate School of Engineering Takamatsu Kagawa761-0396 Japan Beijing Institute of Technology Haidian District Key Laboratory of Convergence Medical Engineering System and Healthcare Technology Ministry of Industry and Information Technology School of Life Science and Technology Beijing100081 China

ISBN: (纸本)9781728164151

Underwater robots provide great possibilities for people to detect the marine environment. Robots need to keep moving stability, need to ensure the safety of the robot during the movement. A novel spherical underwater robot (SUR V) with hybrid propulsion devices that divided into two parts- vectored water-jet and propeller thrusters. A camera is added at robot to monitor the environments. To analyze the motion characteristics of the SUR V, the computational simulation is calculated in ADAMS and ANSYS CFX respectively. The simulation results verify the performance of the improved spherical underwater robot. Finally, the thrust experiments were conducted that evaluate the performance of the hybrid thruster. The thrust experiment proves that in the improved hybrid thruster proposed in this paper, the maximum thrust of the propeller thruster has increased by 4 times than before. © 2020 IEEE.

关键词： Robots

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Modeling and Simulation of the Drug Delivery Function for a Magnetic Driven Capsule Robot 17

Modeling and Simulation of the Drug Delivery Function for a ...

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17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Wang, Zixu Guo, Shuxiang Wei, Wei Kagawa University Graduate School of Engineering Takamatsu Kagawa761-0396 Japan Beijing Institute of Technology Haidian District Key Laboratory of Convergence Medical Engineering System and Healthcare Technology Ministry of Industry and Information Technology School of Life Science and Technology Beijing100081 China

ISBN: (纸本)9781728164151

The capsule robot was developed to detect various intestinal diseases and mainly used in the minimally invasive procedures. Among them, commercial capsule robots can already suit the general inspection requirements. But just having the inspection function is increasingly unable to keep up with the pace of the new era, so developers are working hard to integrate some functional modules into traditional endoscope robots. In this research, we proposed a new type of robot capable of delivering drugs in the affected area, and analyze the rationality of structural design in combination with Ansys Fluent simulation, some improvements in drug delivery structure will be proposed. Finally, the experiment will be carried out for motion stability evaluation of the new type microrobot movement by a custom 6-DOF interial measurement unit. Through the above methods to improve the structural design of the robot and finally get a robot with high performance and stable operation. © 2020 IEEE.

关键词： Robots

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High-speed Raman spectroscopic diagnosis guaranteeing accuracy by reinforcement learning

High-speed Raman spectroscopic diagnosis guaranteeing accura...

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Biomedical Imaging and Sensing Conference 2023

作者： Kubo, Toshiki Tabata, Koji Kawagoe, Hiroyuki Taylor, James N. Mochizuki, Kentaro Clement, Jean-Emmanuel Kumamoto, Yasuaki Harada, Yoshinori Nakamura, Atsuyoshi Fujita, Katsumasa Komatsuzaki, Tamiki Dept. of Applied Physics Osaka Univ. 2-1 Yamadaoka Suita Osaka565-0871 Japan Research Center of Mathematics for Social Creativity Research Institute for Electronic Science Hokkaido Univ. Kita 20 Nishi 10 Kita-ku Sapporo Hokkaido001–0020 Japan Hokkaido University Kita 21 Nishi 10 Kita-ku Sapporo Hokkaido001–0021 Japan Department of Pathology and Cell Regulation GraduateSchool of Medical Science Kyoto Prefectural University of Medicine Kajii-cho Kawaramachi-Hirokoji Kamigyo Kyoto Kyoto602–8566 Japan Institute for Open and Transdisciplinary Research Initiatives Osaka University Yamadaoka Suita Osaka565–087 Japan Graduate Schoolof Information Science and Technology Hokkaido University Kita 14 Nishi 9 Kita-ku Sapporo Hokkaido060–0814 Japan Advanced Photonics and Biosensing Open Innovation Laboratory AIST-Osaka University Yamadaoka Suita Osaka565–0871 Japan Graduate School of Chemical Sciences and Engineering Materials Chemistry and Engineering Course Hokkaido University Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido060–0812 Japan

ISBN: (纸本)9781510663435

We developed spontaneous Raman microscopy using Bandit algorithm to realize fast diagnosis of the existence of anomalies or not with guaranteeing accuracy. The algorithm evaluates obtained Raman spectra during measurement to judge if the diagnosis is completed with ensuring an allowance error rate that users decided and also to generate optimal illumination patterns for the next irradiation which are optimized to accelerate the detection of anomaly. We present our simulation and experimental studies to show that our system can accelerate more than a few tens times faster than line-scanning Raman microscopy which requires full scanning over all pixels. © 2023 SPIE.

关键词： Reinforcement learning

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Synergetic roadmap of carbon neutrality and clean air for China

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Environmental science and Ecotechnology 2023年第4期16卷 1-25页

作者： Qiang Zhang Zhicong Yin Xi Lu Jicheng Gong Yu Lei Bofeng Cai Cilan Cai Qimin Chai Huopo Chen Hancheng Dai Zhanfeng Dong Guannan Geng Dabo Guan Jianlin Hu Cunrui Huang Jianing Kang Tiantian Li Wei Li Yongsheng Lin Jun Liu Xin Liu Zhu Liu Jinghui Ma Guofeng Shen Dan Tong Xuhui Wang Xuying Wang Zhili Wang Yang Xie Honglei Xu Tao Xue Bing Zhang Da Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Bo Zheng Yixuan Zheng Tong Zhu Jinnan Wang Kebin He Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100012China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100012China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China College of Environmental Sciences and Engineering Peking UniversityBeijing100871China Institute of Environmental Policy Management Chinese Academy of Environmental PlanningBeijing100012China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and EngineeringCollaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing University of Information Science and TechnologyNanjing210044China Vanke School of Public Health Tsinghua UniversityBeijing100084China Center for Energy and Environmental Policy Research Beijing Institute of TechnologyBeijing100081China China CDC Key Laboratory of Environment and Population Health National Institute of En

It is well recognized that carbon dioxide and air pollutants share similar emission sources so that synergetic policies on climate change mitigation and air pollution control can lead to remarkable co-benefits on greenhouse gas reduction,air quality improvement,and improved *** the context of carbon peak,carbon neutrality,and clean air policies,this perspective tracks and analyzes the process of the synergetic governance of air pollution and climate change in China by developing and monitoring 18 *** 18 indicators cover the following five aspects:air pollution and associated weather-climate conditions,progress in structural transition,sources,inks,and mitigation pathway of atmospheric composition,health impacts and benefits of coordinated control,and synergetic governance system and *** tracking the progress in each indicator,this perspective presents the major accomplishment of coordinated control,identifies the emerging challenges toward the synergetic governance,and provides policy recommendations for designing a synergetic roadmap of Carbon Neutrality and Clean Air for China.

关键词： Carbon neutrality Clean air Synergetic roadmap

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Stochastic Consensus Algorithms over General Noisy Networks

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SICE Journal of Control, Measurement, and system Integration 2020年第6期13卷 274-281页

作者： Hanada, Kenta Wada, Takayuki Masubuchi, Izumi Asai, Toru Fujisaki, Yasumasa Graduate School of Science and Technology Nara Institute of Science and Technology Japan Graduate School of Information Science and Technology Osaka University Japan Graduate School of System Informatics Kobe University Japan Graduate School of Engineering Nagoya University Japan

Stochastic consensus algorithms are considered for multi-agent systems over noisy unbalanced directed networks. The graph which represents a communication network of the system is assumed to contain a directed spanning tree, that is, a given digraph is weakly connected. Then two types of stochastic consensus are investigated, where one is for the agent states themselves and the other is for the time averages of the agent states. The convergence of the algorithms is investigated, which gives a stopping rule, i.e., an explicit relation between the number of iterations and the closeness of the agreement. © Taylor & Francis Group, LLC 2020.

关键词： Multi agent systems

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Approximate FPGA-based multipliers using carry-inexact elementary modules

Approximate FPGA-based multipliers using carry-inexact eleme...

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作者： Guo, Yi Sun, Heming Lei, Ping Kimura, Shinji Graduate School of Information Production and System Waseda University Kitakyushu-shi808-0135 Japan Waseda Research Institute for Science and Engineering Tokyo169-8555 Japan JST PRESTO Kawaguchi-shi332-0012 Japan

Approximate multiplier design is an effective technique to improve hardware performance at the cost of accuracy loss. The current approximate multipliers are mostly ASIC-based and are dedicated for one particular application. In contrast, FPGA has been an attractive choice for many applications because of its high performance, reconfigurability, and fast development round. This paper presents a novel methodology for designing approximate multipliers by employing the FPGA-based fabrics (primarily look-up tables and carry chains). The area and latency are significantly reduced by applying approximation on carry results and cutting the carry propagation path in the multiplier. Moreover, we explore higher-order multipliers on architectural space by using our proposed small-size approximate multipliers as elementary modules. For different accuracy-hardware requirements, eight configurations for approximate 88 multiplier are discussed. In terms of mean relative error distance (MRED), the error of the proposed 88 multiplier is as low as 1.06%. Compared with the exact multiplier, our proposed design can reduce area by 43.66% and power by 24.24%. The critical path latency reduction is up to 29.50%. The proposed multiplier design has a better accuracy-hardware tradeoff than other designs with comparable accuracy. Moreover, image sharpening processing is used to assess the efficiency of approximate multipliers on application. © 2020 The Institute of Electronics, information and Communication Engineers

关键词： Field programmable gate arrays (FPGA)

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Clairvoyance: Intelligent route planning for electric buses based on urban big data

arXiv

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arXiv 2021年

作者： Lu, Xiangyong Ota, Kaoru Dong, Mianxiong Yu, Chen Jin, Hai Graduate School of Information Sciences Tohoku University Sendai Japan Serviecs Computing Technology and System Lab Big Data Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan430074 China Department of Information and Electronic Engineering Muroran Institute of Technology Hokkaido Muroran Japan

Nowadays many cities around the world have introduced electric buses to optimize urban traffic and reduce the local carbon emissions. In order to cut the carbon emissions and maximize the utility of electric buses, it is important to choose suitable routes for them. Traditionally, route selection is on the basis of dedicated surveys, which are costly in time and labor. In this paper, we mainly focus attention on planning electric bus routes intelligently, depending on the unique needs of each region throughout the city. We propose Clairvoyance, a route planning system that leverages a deep neural network and a multilayer perceptron to predict the future people’s trips and the future transportation carbon emission in the whole city, respectively. Given the future information of people’s trips and transportation carbon emission, we utilize a greedy mechanism to recommend bus routes for electric buses that will depart in an ideal state. Furthermore, representative features of the two neural networks are extracted from the heterogeneous urban datasets. We evaluate our approach through extensive experiments on the real-world data sources in Zhuhai, China. The results show that our designed neural network-based algorithms are consistently superior to the typical baselines. Additionally, the recommended routes for electric buses are helpful in reducing the peak value of carbon emissions and making full use of electric buses in the city. Copyright © 2021, The Authors. All rights reserved.

关键词： Multilayer neural networks

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Recovery of Phosphorus, Magnesium, and Potassium from Surplus Activated Sludge Using Existing Sludge Treatment Facilities and Thickened Primary Sludge

SSRN

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SSRN 2022年

作者： Kamiyama, Yudai Shiraiwa, Takuya Ishikawa, Nao Takahashi, Shinji Sasamoto, Makoto Sasaki, Masayuki Watanabe, Toru Ito, Ayumi Division of Regional Development and Creativity Graduate School of Arts and Sciences Iwate University Ueda 4-3-5 Morioka020-8551 Japan Course of Civil and Environmental Engineering Department of System Innovation Engineering Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Graduate School of Engineering Tohoku University 6-6-11 Aramaki Aza Aoba Aobaku Sendai980-8579 Japan Technical Office Faculty of Science and Engineering Iwate University Ueda 4-3-5 Morioka020-8551 Japan Iwate Prefectural Sewerage Public Cooperation Higashi-Mirumae 3-10-2 Morioka020-0832 Japan Department of Food Life and Environmental Sciences Faculty of Agriculture Yamagata University Wakaba-machi 1-23 Tsuruoka997-8555 Japan

The separation of P, K, and Mg from surplus activated sludge (SAS) was investigated using existing sludge treatment facilities and the thickened primary sludge (TPS). P, Mg, and K were efficiently released from the SAS solid through anaerobic cultivation over 6 h after the addition of TPS to the SAS in an existing storage tank. Released elements were transferred from SAS to SL using an existing mechanical thickener. The addition of TPS and increased TS concentration in SAS increased the concentrations of P, K, and Mg in SL after anaerobic cultivation to 200, 58, and 37 mg/L, respectively. Moreover, the recovery of elements lowers the Mg content in the anaerobic digester and inhibits struvite formation. P in SL was recovered as a hydroxyapatite precipitate by adding CaCl 2 and NaOH solutions. The optimal pH and molar ratio of Ca to P were 9 and 1, respectively. However, Mg and K could not be precipitated together with P. © 2022, The Authors. All rights reserved.

关键词： Recovery

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