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arXiv 2024年

作者： Tang, Rui Okano, Makoto Zhang, Chao Toprasertpong, Kasidit Takagi, Shinichi Takenaka, Mitsuru Department of Electrical Engineering and Information Systems The University of Tokyo Tokyo113-8656 Japan National Institute of Advanced Industrial Science and Technology Ibaraki305-8568 Japan

The slowing down of Moore’s law has driven the development of application-specific processors for deep learning. Analog photonic processors offer a promising solution for accelerating matrix-vector multiplications (MVMs) in deep learning by leveraging parallel computations in the optical domain. Intensity-based photonic MVM processors, which do not utilize the phase information of light, are appealing due to their simplified operations. However, existing intensity-based schemes for such processors often employ wavelength multiplexing or mode multiplexing, both of which have limited scalability due to high insertion loss or wavelength crosstalk. In this work, we present a scalable intensity-based photonic MVM processor based on the concept of waveguide multiplexing. This scheme employs multiport photodetectors (PDs) to sum the intensities of multiple optical signals, eliminating the need for multiple wavelengths or modes. A 16-port Ge PD with a 3 dB bandwidth of 11.8 GHz at a bias voltage of -3 V is demonstrated, and it can be further scaled up to handle 250 ports while maintaining a 6.1 GHz operation bandwidth. A 4 × 4 circuit fabricated on a Si-on-insulator (SOI) platform is used to perform MVMs in a 3-layer neural network designed for classifying Iris flowers, achieving a classification accuracy of 93.3%. Furthermore, the performance of large-scale circuits in a convolutional neural network (CNN) for Fashion-MNIST is simulated, resulting in a classification accuracy of 90.53%. This work provides a simplified and scalable approach to photonic MVM, laying a foundation for large-scale and multi-dimensional photonic matrix-matrix multiplication in optical neural networks. © 2024, CC BY.

关键词： Photodetectors

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A requirement analysis method for the design of the upgradable product-service system 33

A requirement analysis method for the design of the upgradab...

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33rd CIRP Design Conference

作者： Wang, Hanfei Mitake, Yuya Tsutsui, Yusuke Alfarisi, Salman Shimomura, Yoshiki Faculty of Systems Design Tokyo Metropolitan University Asahigaoka 6-6 Hino-shi Tokyo191-0065 Japan Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology Chiba277-0882 Japan Faculty of Computer Science and Systems Engineering Okayama Prefectural University Okayama719-1197 Japan

For extending the life cycle of products and satisfying the further requirement of customers, product-service system (PSS), an integration of products and services is considered as a promising solution. However, for PSS design, customers' expectations on the purchased product could be changed due to the development of technology and fashion. For this reason, the life of value might be exhausted before the real life of a product. Although there are some existing upgrade plans or maintenance plans for PSS design, it is found to be risky for PSS firms to provide the mentioned plans that are threatened by various uncertain events. Thus, to achieve an upgradable PSS, it is extremely essential to propose a method to identify the requirement for upgradability based on the perspective of customers. To achieve this aim, this paper has developed a method includes four steps. In step one, a set of definitions is provided to clarify the upgradability of PSS. In step 2, this study utilizes a PEST-OT matrix to analyze the driver of the future development. Step3 uses a persona-based explorative scenario building method to identify the characteristic of targeted customer and build a scenario of interaction between customer and PSS in a future scenario. Step 4 provides a requirement transformation method to transform the requirement into receiver state parameter (RSP). After that, the RSP is transformed into detailed product characteristics (PChs) and service characteristics (SChs). To verify the effectiveness, a case study of shared furniture is used. The result of the case study shows this method could work effectively in a Business-to-Customer business. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Life cycle

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Scalable intensity-based photonic matrix-vector multiplication processor using single-wavelength time-division-multiplexed signals

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Optics letters 2025年第11期50卷 3656-3659页

作者： Chengli Chai Rui Tang Makoto Okano Kasidit Toprasertpong Shinichi Takagi Mitsuru Takenaka Department of Electrical Engineering and Information Systems The University of Tokyo Tokyo 113-8656 Japan Photonics-Electronics Integration Research Center National Institute of Advanced Industrial Science and Technology (AIST) Ibaraki 305-8569 Japan

Photonic integrated circuits provide a compact platform for ultrafast and energy-efficient matrix-vector multiplications (MVMs) in the optical domain. Recently, schemes based on time-division multiplexing (TDM) have been proposed as scalable approaches for realizing large-scale photonic MVM processors. However, existing demonstrations rely on coherent detection or multiple wavelengths, both of which complicate their operations. In this work, we demonstrate a scalable TDM-based photonic MVM processor that uses only single-wavelength intensity-modulated optical signals, thereby avoiding coherent detection and enabling simplified operations. A 32-channel processor is fabricated on a Si-on-insulator (SOI) platform and used to experimentally perform convolution operations in a convolutional neural network (CNN) for handwritten digit recognition, achieving a classification accuracy of 93.47% for 1500 images.

关键词： Extinction ratios Heterodyne detection Multiplexing Neural networks Optical signals Photonic integrated circuits

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Impact of Hydrogen Incorporation on Performance and PBS Instability in Ultrathin ALD-InOxFETs

Impact of Hydrogen Incorporation on Performance and PBS Inst...

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Annual International Symposium on Reliability Physics

作者： C. -T. Chen T. Irisawa S. Migita Y. Morita H. Ota T. Maeda K. Toprasertpong Semiconductor Frontier Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki Japan Department of Electrical Engineering and Information Systems The University of Tokyo Tokyo Japan

ISBN: (数字)9798331504779

ISBN: (纸本)9798331504786

We have investigated the impact of H-impurity in AlO x -passivated ultrathin ALD-InO x bottom-gate FETs on positive bias stress (PBS) behavior. While the devices fabricated on SiO 2 with N 2 annealing show better current characteristics and long-term stress stability, the devices fabricated on the ALD-deposited AlO x dielectric show abnormal negative-V th shift and change of stability behavior with N 2 annealing. These PBS instabilities in ultrathin InO x , FET are attributed to the H-incorporation from the gate dielectric.

关键词： Silicon compounds Annealing Thermal factors Hydrogen Field effect transistors Process control Dielectrics Reliability Thermal stability Stress

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Optimization of multiple surface roughness characteristics of mild steel turned product using weighted principal component and Taguchi method

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Materials Today: Proceedings 2023年

作者： Khandey, Umesh Arya, Vedpal Department of Mechanical and Manufacturing Engineering National Institute of Advanced Manufacturing Technology Jharkhand Ranchi834003 India Department of Industrial Systems Engineering and Management National University of Singapore Kent Ridge Road 119077 Singapore

This paper presents a hybrid approach utilizing Principal Component Analysis (PCA) integrated with the Taguchi Method to address a multi-criteria optimization problem in the turning process of a cylindrical mild-steel workpiece using a High-Speed Steel tool. Suitable turning process parameters are identified to comply with multiple requirements and assessment of surface quality. The traditional Taguchi method has limitations in solving multi-criteria optimization problems since quality characteristics need to be uncorrelated or independent. To overcome this, PCA was employed to identify independent or uncorrelated quality indices named Principal Components. The study demonstrates the feasibility of PCA and the Taguchi method to forecast an optimal parameter setting for assessing surface quality, followed by confirmatory tests. This paper showcases the mix of PCA and Taguchi methods for multi-criteria optimization and off-line control of correlated multiple surface quality characteristics in turning processes. © 2023

关键词： Surface roughness

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Advancing electrochemical impedance analysis through innovations in the distribution of relaxation times method

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Joule 2024年第7期8卷 1958-1981页

作者： Maradesa, Adeleke Py, Baptiste Huang, Jake Lu, Yang Iurilli, Pietro Mrozinski, Aleksander Law, Ho Mei Wang, Yuhao Wang, Zilong Li, Jingwei Xu, Shengjun Meyer, Quentin Liu, Jiapeng Brivio, Claudio Gavrilyuk, Alexander Kobayashi, Kiyoshi Bertei, Antonio Williams, Nicholas J. Zhao, Chuan Danzer, Michael Zic, Mark Wu, Phillip Yrjänä, Ville Pereverzyev, Sergei Chen, Yuhui Weber, André Kalinin, Sergei V. Schmidt, Jan Philipp Tsur, Yoed Boukamp, Bernard A. Zhang, Qiang Gaberšček, Miran O'Hayre, Ryan Ciucci, Francesco Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong Metallurgical and Materials Engineering Colorado School of Mines Golden80401 United States Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing China Green Energy Storage Trento38123 Italy Department of Manufacturing and Production Engineering Faculty of Mechanical Engineering and Ship Technology Institute of Machine and Materials Technology Gdańsk University of Technology Gdańsk Poland Electrode Design for Electrochemical Energy Systems University of Bayreuth Bayreuth Germany School of Chemistry University of New South Wales Sydney Australia School of Advanced Energy Sun Yat-Sen University Shenzhen China Sustainable Energy Center CSEM Neuchâtel2002 Switzerland Interdisciplinary Faculty of Science and Engineering Shimane University Matsue Japan Centre for Electronic and Optical Materials National Institute for Materials Science Tsukuba Japan Department of Civil and Industrial Engineering University of Pisa Pisa Italy Department of Materials Imperial College London Exhibition Road LondonSW7 2AZ United Kingdom Department of Chemical Engineering Massachusetts Institute of Technology Cambridge02139 United States Electrical Energy Systems University of Bayreuth Bayreuth Germany Ruder Boskovic Institute Zagreb Croatia Department of Materials and Minerals Resources Engineering National Taipei University Taipei Taiwan Finland Johann Radon Institute for Computational and Applied Mathematics Linz Austria School of Science and Engineering Nanjing Tech. University Nanjing China Karlsruhe Germany Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Physical Science Division Pacific Northwest National Laboratory RichlandWA99354 United States Systems Engineering for Electrical Energy Storage University of B

Electrochemical impedance spectroscopy (EIS) is widely used in electrochemistry, energy sciences, biology, and beyond. Analyzing EIS data is crucial, but it often poses challenges because of the numerous possible equivalent circuit models, the need for accurate analytical models, the difficulties of nonlinear regression, and the necessity of managing large datasets within a unified framework. To overcome these challenges, non-parametric models, such as the distribution of relaxation times (DRT, also known as the distribution function of relaxation times, DFRT), have emerged as promising tools for EIS analysis. For example, the DRT can be used to generate equivalent circuit models, initialize regression parameters, provide a time-domain representation of EIS spectra, and identify electrochemical processes. However, mastering the DRT method poses challenges as it requires mathematical and programming proficiency, which may extend beyond experimentalists’ usual expertise. Post-inversion analysis of DRT data can be difficult, especially in accurately identifying electrochemical processes, leading to results that may not always meet expectations. This article examines non-parametric EIS analysis methods, outlining their strengths and limitations from theoretical, computational, and end-user perspectives, and provides guidelines for their future development. Moreover, insights from survey data emphasize the need to develop a large impedance database, akin to an impedance genome. In turn, software development should target one-click, fully automated DRT analysis for multidimensional EIS spectra interpretation, software validation, and reliability. Particularly, creating a collaborative ecosystem hinged on free software could promote innovation and catalyze the adoption of the DRT method throughout all fields that use impedance data. © 2024 Elsevier Inc.

关键词： Electrochemical impedance spectroscopy

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An Iterative Method for a Frequency Domain PID Controller Synthesis

An Iterative Method for a Frequency Domain PID Controller Sy...

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SICE Annual Conference

作者： Kenjiro Minamikawa Yasushi Kami Eitaku Nobuyama Atsushi Hosokawa Department of Mechanical and Electronic System Engineering Advanced Course of National Institute of Technology Akashi College Hyogo Japan Department of Electrical Systems Engineering Hiroshima Institute of Technology Hiroshima Japan Department of Intelligent and Control Systems Kyushu Institute of Technology Fukuoka Japan Department of Electrical and Computer Engineering National Institute of Technology Akashi College Hyogo Japan

This study is concerned with a control system design method with frequency response data named a finite number of frequency responses(an FNFR) model. In this paper a numerical descent direction is introduced and an iterative method for solving control problems formulated with the FNFR model is proposed with the descent direction. One feature of our approach is to update controller variables so that they approach to a feasible region of considering control problems from the outside. The efficiency of our method is shown by numerical examples.

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Life Cycle Assessment of the Energy Consumption of Olivine Powder Production for Enhanced Weathering using the Mine-to-Mill Approach

Life Cycle Assessment of the Energy Consumption of Olivine P...

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Energy and Sustainable Development

作者： Almaz Akhmetov Shota Imai Yutaro Akimoto Keiichi Okajima Rustandi Rendi Naomi Kitagawa Shinichirou Morimoto Systems and Information Engineering University of Tsukuba Tsukuba Japan Global Zero Emission Research Center (GZR) National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

ISBN: (数字)9798331517076

ISBN: (纸本)9798331517083

Enhanced weathering, a negative-emissions technology that involves spreading finely grounded silicate rocks to accelerate carbon sequestration, is critical to achieving a net-zero climate future. However, there are concerns related to the uncertainty of the balance of CO 2 emissions to mine, crush, grind, transport, and spread powdered rocks, and the potential carbon dioxide removal. The research aims to estimate the energy consumption across the entire silicate rock powder production chain by utilizing the extraction simulator software to design and model the integrated mine-to-mill process. The analysis scope includes blasting, crushing, primary grinding, and secondary fine grinding. The circuit performance was evaluated for two blasting scenarios: ordinary and intense. The novelty of this study includes the simulation of the entire mine-to-mill process to estimate the specific energy consumption of olivine powder production. This study contributes to the Life Cycle Assessment of technology by improving the scope and accuracy of the analysis.

关键词： Life cycle assessment Energy consumption Powders Accuracy Uncertainty Net zero Carbon dioxide Weathering Rocks Meteorology

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Assessment of CO2 Emissions from Crushed Stone Transport for Site Selection of Enhanced Weathering systems

Assessment of CO2 Emissions from Crushed Stone Transport for...

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Energy and Sustainable Development

作者： Shota Imai Yutaro Akimoto Keiichi Okajima Rustandi Rendi Naomi Kitagawa Shinichirou Morimoto Systems and Information Engineering University of Tsukuba Tsukuba Japan Global Zero Emission Research Center (GZR) National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

ISBN: (数字)9798331517076

ISBN: (纸本)9798331517083

In order to achieve carbon neutrality by 2050, negative emission technologies are required, and enhanced weathering is attracting attention. In this process, rocks are crushed and spread on farmland to fix CO 2 . However, since CO 2 is emitted during the process from rock mining to spreading, it is necessary to clarify the CO 2 reduction effect over the entire life cycle. In this study, a case study focusing on transportation distance and spreading area in Hokkaido, Japan has been conducted to evaluate CO 2 emission reductions. The area of farmland and the transportation distance from the quarry to the farmland were calculated using Geographic Information System (GIS). The relationship between transportation distance and farmland area was analyzed to clarify the characteristics of each quarry. From the result of the case study, CO 2 emissions from transportation account for up to 30% of total emissions. Furthermore, the quarry case also shows a reduction in CO 2 emissions.

关键词： Net zero Transportation Focusing Production Weathering Soil Rocks Carbon emissions Geographic information systems Meteorology

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Photonic tensor core with low-insertion-loss, non-volatile Ge2Sb2Te3S2 intensity modulators

Photonic tensor core with low-insertion-loss, non-volatile G...

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49th European Conference on Optical Communications (ECOC 2023)

作者： Y. Miyatake R. Tang K. Makino J. Tominaga N. Miyata M. Okano K. Toprasertpong S. Takagi M. Takenaka Department of Electrical Engineering and Information Systems The University of Tokyo Tokyo Japan Device Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

We proposed a low-insertion-loss and non-volatile optical intensity modulator based on Ge 2 Sb 2 Te 3 S 2 (GSTS), a recently proposed widegap phase change material. We demonstrated matrix-vector multiplication using a new photonic tensor core with GSTS intensity modulators, enabling a high recognition accuracy of 97.34 % in CNN.

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