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Position Sensorless Torque Estimation of Synchronous Reluctance Motors Based on Extended-Flux Model without Core-Loss Measurement

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Journal of Energy and Power Engineering 2012年第9期6卷 1480-1487页

作者： masaru hasegawa Hiroki Kitahara Atsushi Matsumoto Department of Electrical Engineering Chubu University Aichi 487-8501 Japan Department of Electrical Engineering and Computer Science Nagoya University Nagoya 468-8603 Japan

This paper proposes an extended-flux model with core-loss resistance of SynRMs （synchronous reluctance motors） and precise torque estimation without core-loss measurement and position encoder. The proposed torque estimation is useful for precise MTPA （maximum torque per ampere） control of position sensorless controlled SynRMs, which is achieved with the assistance of active and reactive powers.

关键词： Synchronous reluctance motors maximum torque per ampere control torque estimation magnetic saturation positionsensorless.

Measurement Techniques for Distribution Line Impedance by Minimum Pulse Injection

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Journal of Energy and Power Engineering 2013年第10期7卷 1998-2005页

作者： Iida Kouji Nakashima Hiroaki Keiju Matsui hasegawa masaru Ueda Fukashi Department of Electrical Engineering Chubu University Matsumoto-cho Kasugai City Aichi 487-8501 Japan Chubu Electric Power Co. Inc. Ootaka-cho Midori-ku Nagoya-city Aichi 459-8522 Japan

With a live wire, line impedance could be measured by means of only passive elements such as inductors or resistors, whose techniques are well known. However, as the voltage and current used for the measurement are increased, the size of the inductor or resistor being used also needs to be increased, so it would be virtually impossible to make an accurate measurement. Because of this, the authors have developed a novel measurement method for line impedance using LC resonance, which the authors describe first place. In the second place, the authors propose another line impedance. The novel method is that the rectangular wave with minimum voltage is injected into the distribution line system. By means of this method, the line capacitance and the line inductance can be measured. These proposals are confirmed by the simulation or experiment. Finally, the frequency response analysis method is to be examined, whose mechanism and results are to be presented and discussed.

关键词： Line impedance distribution system line capacitance LC resonance pulse injection.

Complex-Valued Neural Networks:A Comprehensive Survey

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IEEE/CAA Journal of Automatica Sinica 2022年第8期9卷 1406-1426页

作者： ChiYan Lee Hideyuki hasegawa Shangce Gao Faculty of Engineering University of ToyamaToyama 930-8555Japan

Complex-valued neural networks(CVNNs)have shown their excellent efficiency compared to their real counterparts in speech enhancement,image and signal *** throughout the years have made many efforts to improve the learning algorithms and activation functions of *** CVNNs have proven to have better performance in handling the naturally complex-valued data and signals,this area of study will grow and expect the arrival of some effective improvements in the ***,there exists an obvious reason to provide a comprehensive survey paper that systematically collects and categorizes the advancement of *** this paper,we discuss and summarize the recent advances based on their learning algorithms,activation functions,which is the most challenging part of building a CVNN,and ***,we outline the structure and applications of complex-valued convolutional,residual and recurrent neural ***,we also present some challenges and future research directions to facilitate the exploration of the ability of CVNNs.

关键词： Complex activation function complex backpropagation algorithm complex-valued learning algorithm complex-valued neural network deep learning

Reproducibility and Validity of a Chinese Food Frequency Questionnaire

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Biomedical and Environmental Sciences 2010年第S1期23卷 1-38页

作者： Water WILLETT Kyoko hasegawa Department of Nutrition Harvard School of Public Health Kagawa Nutrition University

Objectives This study was design to develop a semi-quantitative Chinese Food Frequency Questionnaire （FFQ） and to conduct a validation study for the questionnaire. Methods Based on the survey experience in recent years, a new Chinese food frequency questionnaire （FFQ） with 149 items in 17 food categories was developed. A validation study on this new FFQ was conducted in Jiangsu and Beijing of China between 1999 and 2001. The period of study covered 1 year and the FFQ was validated by comparing with data obtained by a six repeated 24-hour recalls for 3 consecutive days, or a totally 18-day 24- hour recall throughout the year. A total of 271 healthy adult subjects were enrolled in the study. Food and nutrient intakes measured by the 18-day dietary recalls and food frequency questionnaires （FFQs） were computed in the National Institute for Nutrition and Food Safety, China CDC using the existing nutrition database. The average daily intake of foods and nutrients over the 18-day recall was used to compare with FFQ1 and FFQ2, which was conducted at the beginning and the end of the year, respectively. All statistical analyses were carried out using SAS software version 6.12.

关键词： FFQ Reproducibility and Validity of a Chinese Food Frequency Questionnaire

A technique utilizing chemical reagents for direct measurement of temperature at a local area and its engineering applications

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Acta Mechanica Sinica 2009年第2期25卷 149-160页

作者： M.Saka T.hasegawa Department of Nanomechanics Tohoku University

Temperature is one of the physical quantifies through which quantitative evaluation of the safety and reliability of industrial products can be achieved, and this has been used widely in practice. Under any environmental condifion, regardless of the size of the object to be inspected, accurate and reliable measurement of temperature is of great practical importance. This review article presents a simple and direct method of temperature measurement, that can be applied to the local areas with difficulty in measuring the temperature by using normal thermometers. In the present article, two different application examples are demonstrated. One addresses the study of the electromigration of solders which are used as bonding metals in electronic devices （micro-structures）. The application of the method to the shaft of a motor used in heavy industrial fields is explained as the second.

关键词： Temperature measurement Chemicalreagents Melting point Temperature distribution

Retinal ganglion cell protection by hop-flower extract as a novel neuroprotective strategy for glaucoma

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Neural Regeneration Research 2022年第6期17卷 1267-1268页

作者： Tomoko hasegawa Hanako Ohashi Ikeda Department of Ophthalmology and Visual Sciences Kyoto University Graduate School of MedicineKyotoJapan Research Fellow of Japan Society for the Promotion of Science TokyoJapan

In glaucoma,a leading cause of blindness,retinal ganglion cells are progressively *** pressure reduction is the only established treatment for glaucoma(Collaborative Normal-Tension Glaucoma Study Group,1998;Vass et al.,2007).However,in some cases,visual field loss progresses despite sufficiently reduced intraocular pressure(Collaborative Normal-Tension Glaucoma Study Group,1998;Killer and Pircher,2018).While intraocular pressure and age are known risk factors for glaucoma(Ernest et al.,2013),the underlying mechanisms of glaucoma progression are not fully understood.

关键词： glaucoma al. protective

NUMERICAL SIMULATION ON COMPRESSIBLE TURBULENCE BY SPECTRAL METHOD

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Acta Mechanica Sinica 1998年第3期14卷 193-207页

作者：王健平 Tatsuya hasegawa State Key Laboratory for Turbulence Research Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Department of Mechanical Engineering Nagoya Institute of TechnologyGokiso-choShowa-kuNagoya 466Japan

The numerical and physical issues of simulations on compressible turbulence are reviewed in the present paper. An outline of the global spectral methods and the progress of recent local spectral methods are illustrated. Several typical subjects in this field are studied, including homogeneous isotropic turbulence, autoignition in premixed turbulence, interaction between flames and turbulence, and shock wave in turbulence. The results of the numerical simulations are discussed, enabling us to discover and to understand the physical phenomena which have not been solved by experiments.

关键词： compressible turbulence turbulent flame spectral method

Effect of additional element and heat treating temperature on micro-structure and mechanical behavior of Ag alloy thin film

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中国有色金属学会会刊：英文版 2006年第B01期16卷 217-219页

作者： ISHIGURO S A RIZONO T hasegawa K Department of Material Science and Engineering Saitama Institute of TechnologyFusaiji 1690OkabeSaitamaJapan 369-0293 Ishifuku Metal Industry Co Ltd Kana 3-20-7Chiyoda-kuTokyoJapan

For Ag alloy film used for the storage media, it is required to have heat-resistance, anti-constant temperature and anti-constant humidity characteristics, corrosion resistance, while high reflectivity over Al is maintained. An Ag alloy thin film (additive element Pd, Cu, P) was created on glass substrates, and various heat treatment was conducted. Then, fine structure was observed on this thin film using AFM, and fine structure evaluation of the inside was carried out by the in-plane diffractometry and X-ray diffractometry, and in addition, residual stress analysis was carried out. These results were compared and were examined, and fine structure and physical property in a metallic thin film were evaluated, and usefulness of evaluation method was verified.

关键词：银合金薄膜添加元素热处理温度显微结构力学行为

Prevalence and characteristics of Kawasaki disease before and during the COVID-19 pandemic

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World Journal of Pediatrics 2021年第2期17卷 215-217页

作者： Rintaro Ono Daisuke hasegawa Department of Pediatrics St.Luke's International Hospital9-1 AkashichoChuo-kuTokyo 104-8560Japan

Kawasaki disease(KD)is a febrile disease with unclear *** far,KD has been considered to be trig-gered,at least in part,by an infection[1].In 2020,corona-virus disease 2019(COVID-19)became a global pandemic and lifestyles changed ***,the preva-lence of common infection has decreased *** epidemiological change prompted us to postulate that major variations of common pediatric infections would affect the incidence of KD.

关键词： prompt characteristics Kawasaki