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Nanometer-Order Contouring Control in a Feed Drive System Using Linear Ball Guides by Applying a Combination of Modified Disturbance Observer and Repetitive Control

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Nanomanufacturing and Metrology 2021年第2期4卷 118-129页

作者： Tomofumi Ohashi hitoshi Shibata Shigeru Futami Ryuta Sato THK Co. Ltd.4-9-16 HigashikoujiyaOta-kuTokyoJapan Advanced Manufacturing Systems Laboratory Kobe University2-1 RokkodaiNada-kuKobeHyogoJapan

This paper proposes a quadrant glitch compensation method to achieve nanometer-level accuracy of contouring control for a feed drive system using linear ball *** proposed method is a combination of a modified disturbance observer(“disturbance suppressor”)and an improved repetitive control *** motion tests with 1 mm amplitude and 0.1 Hz driving frequency were conducted using a single-axis feed drive system to verify the quadrant glitch compensation ability of this ***,the repeatability of the quadrant glitches in the experimental system was verified,which is the most important characteristic required for compensation via repetitive ***,by applying the combination of disturbance suppressor and conventional repetitive control,the amplitudes of the quadrant glitches were decreased to less than 1 nm;in other words,the ratio of the magnitude of the quadrant glitch to the amplitude of the position reference was less than 1/1,000,***,for both compensation schemes mentioned before,vibrations were generated when the feed speed ***,the amplitudes increased with the number of *** reason for the vibrations was identified as the repetitive control *** suppress these vibrations,the repetitive control was applied only to narrowed regimes near the quadrant ***,the maximum contouring error was decreased to 2 *** addition,the nonlinear spring behavior of the linear ball guides was confirmed to affect the stability of the control systems.

关键词： Quadrant glitch Feed drive system Contouring control Repetitive control Disturbance observer Nonlinear spring behavior

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Machine learning adaptation of intraocular lens power calculation for a patient group

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Eye and Vision 2021年第5期8卷 422-430页

作者： Yosai Mori Tomofusa Yamauchi Shota Tokuda Keiichiro Minami hitoshi Tabuchi Kazunori Miyata Miyata Eye Hospital 6‑3 Kurahara‑choMiyakonojoMiyazaki 885‑0051Japan Department of Ophthalmology Tsukazaki Hospital68‑1 WakuAboshi‑kuHimejiHyogo 671‑1227Japan Department of Technology and Design Thinking for Medicine Hiroshima University1‑2‑3 KasumiMinami‑kuHiroshima 734‑8553Japan

Background:To examine the effectiveness of the use of machine learning for adapting an intraocular lens(IOL)power calculation for a patient ***:In this retrospective study,the clinical records of 1,611 eyes of 1,169 Japanese patients who received a single model of monofocal IOL(SN60WF,Alcon)at Miyata Eye Hospital were reviewed and *** biometric metrics and postoperative refractions of 1211 eyes of 769 patients,constants of the SRK/T and Haigis formulas were *** SRK/T formula was adapted using a support vector *** errors in the use of adapted formulas as well as the SRK/T,Haigis,Hill-RBF and Barrett Universal II formulas were evaluated with data from 395 eyes of 395 distinct *** prediction errors,median absolute errors,and percentages of eyes within±0.25 D,±0.50 D,and±1.00 D,and over+0.50 D of errors were compared among ***:The mean prediction errors in the use of the SRT/K and adapted formulas were smaller than the use of other formulas(P<0.001).In the absolute errors,the Hill-RBF and adapted methods were better than *** performance of the Barrett Universal II was not better than the others for the patient *** were the least eyes with hyperopic refractive errors(16.5%)in the use of the adapted ***:Adapting IOL power calculations using machine learning technology with data from a particular patient group was effective and promising.

关键词： Machine learning Adaptation Intraocular lens power calculation Patient ethnicity Patient race Region of patient SRK/T formula

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Optimal Restoration Scheduling of Damaged Networks Under Uncertain Environment by Using Improved Genetic Algorithm

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Tsinghua Science and Technology 2008年第S1期13卷 400-405页

作者： hitoshi FURUTA Ken ISHIBASHI Koichiro NAKATSU Shun HOTTA Department of Informatics Kansai University Graduate School of Informatics Kansai University

The purpose of this research is to propose an early restoration for lifeline systems after earthquake disasters. The previous researches show that the optimization of the restoration schedule by using genetic algorithm (GA) is powerful. However, those are not considering the uncertain environment after earthquake disasters. The circumstances of the damage at devastated areas are very changeable due to the aftershock, fire disaster and bad weather. In addition, the restoring works may delay by unexpected accidents. Therefore, it is necessary to obtain the restoration schedule which has robustness, because the actual restoring works could not progress smoothly under the uncertain environment. GA considering uncertainty (GACU) can treat various uncertainties involved, but it is difficult to obtain the robust schedule. In this study, an attempt is made to develop a decision support system of the optimal restoration scheduling by using the improved GACU.

关键词： restoration schedule genetic algorithm uncertainty delay of schedule

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Selective adsorption and stable solidification of radioactive cesium ions by porous silica gels loaded with insoluble ferrocyanides

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Science China Chemistry 2014年第11期57卷 1470-1476页

作者： YIN XiangBiao WU Yan MIMURA hitoshi NIIBORI Yuichi WEI YueZhou Department of Quantum Science and Energy Engineering Tohoku University School of Nuclear Science and Engineering Shanghai Jiao Tong University

Development of highly functional cesium selective adsorbents for the decontamination of high-activity-level water(HALW) from the Fukushima NPP-1 accident is very urgent. In order to selectively adsorb the radioactive cesium, three kinds of novel porous silica gels loaded with insoluble ferrocyanides(SLFC) were prepared using a successive impregnation/precipitation method. Based on the results of previous research, the SLFC composites have relatively large uptake ratio above 95%, distribution coefficients(Kd) above 103 cm3/g, and excellent adsorption kinetics even in seawater. The solidification results also indicate that zeolites have an excellent Cs immobilization characteristic, gas-trapping and self-sintering abilities, and low leachability. We chose three kinds of SLFC composites to achieve the optimization of solidification by mixing with nine kinds of additives at high temperatures(up to 1200 °C). The Cs contents in the three composites were estimated to be below 30% of the initial contents and decreased with the three stages at calcination temperatures ranging from 25 to 1200 °C. By contrast, the Cs immobilization ratio was markedly lowered by mixing with additives: of those, allophane had the best immobilization result. By increasing the additive ratio to 50 wt%, the Cs immobilization ratio became almost 100% and no volatilization of Cs was detected even after calcination at 1200 °C. This result indicates that calcination of the mixture of SLFC composites after adsorbing Cs+ ions and specific additives under appropriate ratio is effective for stable solidification.

关键词：二氧化硅凝胶选择性吸附铁氰化物铯离子不溶性放射性凝固稳定

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A distributed authentication and authorization scheme for in-network big data sharing

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Digital Communications and Networks 2017年第4期3卷 226-235页

作者： Ruidong Li hitoshi Asaeda Jie Li Xiaoming Fu Network System Research Institute National Instate of Information and Communications Japan (NICT) Tokyo 184-8795 Japan Department of Computer Science University of Tsukuba Ibaraki 305-8577 Japan Institute of Computer Science University of Gottingen Gottingen 37077 Germany

Big data has a strong demand for a network infrastructure with the capability to support data sharing and retrieval efficiently. Information-centric networking (ICN) is an emerging approach to satisfy this demand, where big data is cached ubiquitously in the network and retrieved using data names. However, existing authentication and authorization schemes rely mostly on centralized servers to provide certification and mediation services for data retrieval. This causes considerable traffic overhead for the secure distributed sharing of data. To solve this problem, we employ identity-based cryptography (IBC) to propose a Distributed Authentication and Authorization Scheme (DAAS), where an identity-based signature (IBS) is used to achieve distributed verifications of the identities of publishers and users. Moreover, Ciphertext-Policy Attribute-based encryption (CP-ABE) is used to enable the distributed and fine-grained authorization. DAAS consists of three phases: initialization, secure data publication, and secure data retrieval, which seamlessly integrate authentication and authorization with the interest/data communication paradigm in ICN. In particular, we propose trustworthy registration and Network Operator and Authority Manifest (NOAM) dissemination to provide initial secure registration and enable efficient authentication for global data retrieval. Meanwhile, Attribute Manifest (AM) distribution coupled with automatic attribute update is proposed to reduce the cost of attribute retrieval. We examine the performance of the proposed DAAS, which shows that it can achieve a lower bandwidth cost than existing schemes.

关键词： Big data Security Authentication Access control In-network data sharing Information-centric network

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Analysis of value of flexibility in Japan’s power system with increased VRE

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Clean Energy 2018年第1期2卷 37-44页

作者： Sumie Nakayama hitoshi Azuma Suguru Fukutome Kazuhiko Ogimoto J-POWER/Electric Power Development Co. Ltd.6-15-1GinzaChuo-kuTokyo 104-8165Japan JP Business Service Corporation 2-2-18FukagawaKoto-kuTokyo 135-8451Japan Institute of Industrial Science Collaborative Research Center for Energy EngineeringThe University of Tokyo4-6-1KomabaMeguro-kuTokyo153-8585Japan

The growth of renewable energy has accelerated globally toward a low-carbon economy since the Paris Agreement entered into force in *** a result of the increase of variable renewable energy(VRE),namely solar PV and wind,power systems require more flexibility from conventional power plants with less power generation to regulate increased *** are sources of flexibility other than conventional power plants,including enhanced power networks,storage capacity and demand *** maximize economic utilization of VRE power generation,it is necessary to use the flexibility potential from all these *** Japan,the share of VRE has increased since the introduction of a feed-in tariff(FIT)and,in parallel,power market reform is *** has a unique power system of nine grids connected like a fish bone,making the uptake of an increasing share of VRE *** paper assesses the value of flexibility by source in Japan’s power system in *** analysis of different VRE scenarios is undertaken based on a newly developed production cost *** result of the simulation shows the quantitative impact of each source of flexibility to the generation cost and VRE curtailment and demonstrates the mechanism by which flexibility works to impact VRE curtailment.

关键词： component power demand and supply renewable energy flexibility Japan’s power system produc-tion cost model analysis

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Study of Electron Orbits for Formation of Toroidal Closed Flux Surface by ECH

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Plasma Science and Technology 2011年第3期13卷 342-346页

作者： Tak,ushi MAEKAWA Tomokazu YOSHINAGA hitoshi TANAKA Masaki UCHIDA Fumitake WATANABE Graduate School of Energy Science Kyoto University Kyoto 606-8502 Japan National Institute for Fusion Science Toki 509-5292 Japan

Electron orbits under the external vertical field （Bv） and the self poloidal field of the toroidal plasma current in a toroidal geometry are investigated by using analytic model fields in order to search for the conditions of occurence of appropriate confinement asymmetry of fast electrons along the field lines. This asymmetry efficiently and quickly generates a toroidal current, which may close the field lines in ECH-started plasmas. It is analytically shown that the characteristics of confinement asymmetry depend on the product of the major radius and the strength of the external vertical field. The results suggest that in large devices By should be lowered and also some artificial means to speed up the pitch angle scattering for the fast electrons at a higher energy range are beneficial to generate the toroidal current in order to close the filed

关键词： ECH closed flux surface electron orbit

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Selection of Suitable Maximum-heart-rate Formulas for Use with Karvonen Formula to Calculate Exercise Intensity

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International Journal of Automation and computing 2015年第1期12卷 62-69页

作者： Jinhua She hitoshi Nakamura Koji Makino Yasuhiro Ohyama Hiroshi Hashimoto Graduate School of Bionics Computer and Media Sciences Tokyo University of Technology 1404-1 KatakuraHachioji Tokyo 192-0982 Japan Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi4-3-11 Takeda Kofu 400-8511 Japan Master Program of Innovation for Design and Engineering Advanced Institute of Industrial Technology 1-10-40 HigashiooiShinagawa-ku Tokyo 140-0011 Japan

The Karvonen formula, which is widely used to estimate exercise intensity, contains maximum heart rate, H Rmax, as a variable. This study employed pedaling experiments to assess which of the proposed formulas for calculating H Rmaxwas the most suitable for use with the Karvonen formula. First, two kinds of experiments involving an ergometer were performed: an all-in-one-day experiment that tested eight pedaling loads in one day, and a one-load-per-day experiment that tested one load per day for eight days.A comparison of the data on 7 subjects showed that the all-in-one-day type of experiment was better for assessing H Rmaxformulas,at least for the load levels tested in our experiments. A statistical analysis of the experimental data on 47 subjects showed two of the H Rmaxformulas to be suitable for use in the Karvonen formula to estimate exercise intensity for males in their 20 s. In addition, the physical characteristics of a person having the greatest impact on exercise intensity were determined.

关键词： Borg CR10 scale Karvonen formula exercise intensity maximum heart rate pedaling statistical analysis

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Behavior of reinforced concrete structural walls with various opening locations: experiments and macro model

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第3期11卷 202-211页

作者： Ji-yang WANG Masanobu SAKASHITA Susumu KONO hitoshi TANAKA Wen-juan LOU Institute of Structural Engineering Zhejiang UniversityHangzhou 310058China Department of Architecture Kyoto UniversityKyoto 615-8012Japan Disaster Prevention Research Institute Kyoto UniversityKyoto 611-0011Japan

Two experimental tests of three-storied reinforced concrete structural walls having large openings were *** on an original macro model,a multiple modified macro-model was proposed to develop a simple method to design a reinforced concrete structural wall with large openings and various opening *** interaction between reinforcement ties and concrete struts formed along the perimeter of openings was neglected in the original ***,the strut-and-tie node was proposed to take account of such interaction in the proposed *** predicted behavior of two specimens using such a proposed model was compared with the experimental *** is shown that the behavior of structural walls with large openings could be modeled well using the proposed ***,the study indicates that the proposed model is applicable even in cases of multi-story structural walls having large openings and various opening locations.

关键词：钢筋混凝土结构宏观模型实验测试行为墙地点开放结构大开口

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Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests

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Frontiers of Structural and Civil Engineering 2013年第4期7卷 466-476页

作者： Liang-Jiu JIA Tsuyoshi KOYAMA hitoshi KUWAMURA Department of Architecture School of Engineeringthe University of TokyoTokyo 113-8656Japan

Cold-formed steel members,which experience complicated prestrain histories,are frequently applied in structural *** paper aims to predict cyclic plasticity of structural steels with tensile and compressive *** and cyclic tests on hourglass specimens with tensile and compressive prestrain are conducted,and compared with numerical simulations using the Chaboche *** approaches are taken in the *** first requires only the monotonic tensile test data from the prestrained steels,and the second requires both the monotonic tensile test data from the virgin steel and the prestrain *** first approach slightly overestimates the compressive stress for specimens with tensile prestrain,while the second approach is able to accurately predict the cyclic plasticity in specimens with tensile and compressive prestrain.

关键词： cyclic plasticity prestrain Chaboche model mild steel

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