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A High Performance and Energy Efficient Microprocessor with a Novel Restricted Dynamically Reconfigurable Accelerator

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Circuits and Systems 2017年第5期8卷 134-147页

作者： Itaru Hida shinya takamaeda-yamazaki Masayuki Ikebe Masato Motomura Tetsuya Asai Graduate School of Information Science and Technology Hokkaido University Sapporo Japan

In the era of Internet of Things, the battery life of edge devices must be extended for sensing connection to the Internet. We aim to reduce the power consumption of the microprocessor embedded in such devices by using a novel dynamically reconfigurable accelerator. Conventional microprocessors consume a large amount of power for memory access, in registers, and for the control of the processor itself rather than computation;this decreases the energy efficiency. Dynamically reconfigurable accelerators reduce such redundant power by computing in parallel on reconfigurable switches and processing element arrays (often consisting of an arithmetic logic unit (ALU) and registers). We propose a novel dynamically reconfigurable accelerator “DYNaSTA” composed of a dynamically reconfigurable data path and static ALU arrays. The static ALU arrays process instructions in parallel without registers and improve energy efficiency. The dynamically reconfigurable data path includes registers and many switches dynamically reconfigured to resolve operand dependencies between instructions mapped on the static ALU array, and forwards appropriate operands to the static ALU array. Therefore, the DYNaSTA accelerator has more flexibility while improving the energy efficiency compared with the conventional dynamically reconfigurable accelerators. We simulated the power consumption of the proposed DYNaSTA accelerator and measured the fabricated chip. As a result, the power consumption was reduced by 69% to 86%, and the energy efficiency improved 4.5 to 13 times compared to a general RISC microprocessor.

关键词： Embedded Microprocessor Reconfigurable Low-Power Accelerator Digital Circuit Architecture

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A Multithreaded CGRA for Convolutional Neural Network Processing

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Circuits and Systems 2017年第6期8卷 149-170页

作者： Kota Ando shinya takamaeda-yamazaki Masayuki Ikebe Tetsuya Asai Masato Motomura Hokkaido University Sapporo Japan

Convolutional neural network (CNN) is an essential model to achieve high accuracy in various machine learning applications, such as image recognition and natural language processing. One of the important issues for CNN acceleration with high energy efficiency and processing performance is efficient data reuse by exploiting the inherent data locality. In this paper, we propose a novel CGRA (Coarse Grained Reconfigurable Array) architecture with time-domain multithreading for exploiting input data locality. The multithreading on each processing element enables the input data reusing through multiple computation periods. This paper presents the accelerator design performance analysis of the proposed architecture. We examine the structure of memory subsystems, as well as the architecture of the computing array, to supply required data with minimal performance overhead. We explore efficient architecture design alternatives based on the characteristics of modern CNN configurations. The evaluation results show that the available bandwidth of the external memory can be utilized efficiently when the output plane is wider (in earlier layers of many CNNs) while the input data locality can be utilized maximally when the number of output channel is larger (in later layers).

关键词： CNN Convolutional Neural Network Deep Learning Multithreaded Architecture CGRA

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Integrally Closed Ideals of Reduction Number Three

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Algebra Colloquium 2023年第2期30卷 315-324页

作者： shinya Kumashiro National Institute of Technology(KOSEN) Oyama College 771 NakakukiOyamaTochigi323-0806Japan

In a Cohen-Macaulay local ring(A,m),we study the Hilbert function of an integrally closed m-primary ideal I whose reduction number is three.,With a mild assump-tion we give an inequality ιA(A/I)≥e0(I)-e1(I)+(e2(I)+lA(I^(2)/QI)/2,where ei(I)denotes the ith Hilbert coeficient and Q denotes a minimal reduction of *** inequality is located between inequalities of Itoh and ***,this inequality be-comes an equality if and only if the depth of the associated graded ring of I is larger than or equal to dim *** also study the Cohen-Macaulayness of the associated graded rings of determinantal rings.

关键词： Hilbert function Rees algebra associated graded ring Sally module Cohen-Macaulay ring

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Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions

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Friction 2020年第2期8卷 471-480页

作者： Shinji KATO shinya SASAKI Engineering Headquarters Automotive ComponentsKYB Corporation2548DolaKani-shiGifu 509-0298Japan Department of Mechanical Engineering Faculty of Engineering Division ITokyo University of Science6-3-1NiijukuKatsushika-kuTokyo 125-8585Japan

The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always *** this study,a device was developed and used to analyze the dynamic friction characteristics under various reciprocating sliding conditions to determine the sliding materials and hydraulic oils that improve the shock absorber *** study describes the influence of hydraulic oil additive on the fine reciprocating friction characteristics of steel and copper *** oils were prepared by blending a paraffinic mineral oil with zinc dithiophosphate(ZnDTP)and polyhydric alcohol ester as *** results show that the dynamic frictional characteristics vary mainly depending on the additive concentration.A specific additive formulation induces a unique amplitude-dependent friction *** addition,the influence of different additives on the lubrication mechanism is investigated based on the instrumental analysis of the friction surface.

关键词： shock absorber dynamic friction reciprocating friction additive zinc dithiophosphate(ZnDTP)

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Novel image-enhanced endoscopy with i-scan technology

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World Journal of Gastroenterology 2010年第9期16卷 1043-1049页

作者： shinya Kodashima Mitsuhiro Fujishiro Department of Endoscopy and Endoscopic Surgery Graduate School of MedicineThe University of Tokyo

i-scan technology is the newly developed imageenhanced endoscopy technology from PENTAX,*** consists of three types of algorithms:surface enhancement (SE),contrast enhancement (CE),and tone enhancement (TE).SE enhances light-dark contrast by obtaining luminance intensity data for each pixel and applying an algorithm that allows detailed observation of a mucosal surface *** digitally adds blue color in relatively dark areas,by obtaining luminance intensity data for each pixel and applying an algorithm that allows detailed observation of subtle irregularities around the *** enhancement functions work in real time without impairing the original color of the organ,therefore,SE and CE are suitable for screening endoscopy to detect gastrointestinal tumors at an early *** dissects and analyzes the individual RGB components of a normal *** algorithm then alters the color frequencies of each component and recombines the components to a single,new color *** is designed to enhance minute mucosal structures and subtle changes in *** works in real time and consists of three modes such as TE-g for gastric tumors,TE-c for colonic tumors,and TE-e for esophageal *** is suitable mainly for detailed examination of the lesions that are detected in a screening endoscopy.i-scan technology leads us to easier detection,diagnosis and treatment of gastroi ntestinal diseases.

关键词： Gastrointestinal tumor Gastrointestinal endoscopy

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Towards a unified interpretation of the early Universe in R^(2)-corrected dark energy model of F(R)gravity

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Chinese Physics C 2022年第10期46卷 259-269页

作者： Hua Chen Taishi Katsuragawa shinya Matsuzaki Institute of Astrophysics Central China Normal UniversityWuhan 430079China Center for Theoretical Physics and College of Physics Jilin UniversityChangchun 130012China

R^(2)-corrected dark energy(DE)models in F(R)gravity have been widely investigated in recent years,which not only removes the weak singularity potentially present in DE models but also provide us with a unified picture of the cosmic history,including the inflationary and DE *** the unified interpretation of dynamical DE all over the cosmic history in the class of R^(2)-corrected DE models,we explore the universal features of the scalaron dynamics in the radiation-dominated epoch,along with the chameleon mechanism,by keeping our eyes on the inflationary and DE *** show that the scalaron evolution does not follow a surfing solution and is mostly adiabatic before big bang nucleosynthesis(BBN),even properly including the kick by the nonperturbative QCD phase transition,hence a catastrophic consequence claimed in the literature is not applied to this class of DE *** is due to the presence of the gigantic scale hierarchy between R^(2) correction and DE,so is the universal feature for the class of R^(2)-corrected DE *** prospects for the post-or onset-inflationary epoch would be pretty different from what the standard R^(2) inflationary scenario undergoes due to the presence of the chameleon mechanism.

关键词： modified gravity dark energy inflation

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Unified interpretation of scalegenesis in conformally extended standard models:a dynamical origin of Higgs portal

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Chinese Physics C 2020年第11期44卷 7-13页

作者： Hiroyuki Ishida shinya Matsuzaki Ruiwen Ouyang Theory Center IPNSKEKTsukubaIbaraki 305-0801Japan Center for Theoretical Physics and College of Physics Jilin UniversityChangchun 130012China Laboratory of High Energy and Computational Physics National Institute of Chemical Physics and BiophysicsRavala pst.1010143 TallinnEstonia

We present a universal interpretation of a class of conformal extended standard models that include Higgs portal interactions as realized in low-energy effective *** scale generation mechanism in this class(scalegenesis)arises along the(nearly)conformal/flat direction for breaking scale symmetry,where the electroweak symmetry-breaking structure arises similarly as in the standard model.A dynamical origin for the Higgs portal coupling can provide the discriminator for the low-energy“universality class,”to be probed in forthcoming collider experiments.

关键词： beyond standard model hidden QCD conformal symmetry

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Attenuation and Distortion of Compression Waves Propagating in Very Long Tube

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Journal of Thermal Science 2011年第1期20卷 53-57页

作者： shinya NAKAMURA Daisuke SASA Toshiyuki AOKI Graduate School of Engineering Sciences Kyushu UniversityKasugaFukuoka816-8580Japan

A lot of phenomena related to propagating various waves are seen when the high-speed train goes through the tunnel,the gas pipeline is broken due to an accident or the air brake of the wagon *** instance,a compression wave generated ahead of a high-speed train entering a tunnel propagates to the tunnel exit and spouts as a micro pressure wave,which causes an exploding *** order to estimate the magnitude correctly,the mechanism of the attenuation and distortion of a compression wave propagating along a very long tunnel must be understood and the experimental information on these phenomena is *** experimental investigation is carried out to clarify the attenuation and distortion of the propagating compression wave in a very long *** results show that the strength of a compression wave decreases with *** attenuation and distortion of compression waves are affected by the initial waveform of the compression wave and by the unsteady boundary layer induced by the propagating *** shape of a compression wave becomes different with the propagating distance;that is,a shock wave appears just head of a wavefront and an overshoot on pressure distribution is observed behind a shock wave due to the transition of the unsteady boundary layer.

关键词： Propagating Compression Wave Very Long Tube Micro-pressure Wave High-Speed Train

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F(R) gravity in the early Universe: electroweak phase transition and chameleon mechanism

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Chinese Physics C 2019年第10期43卷 86-98页

作者： Taishi Katsuragawa shinya Matsuzaki Eibun Senaha Institute of Astrophysics Central China Normal UniversityWuhan 430079China Center for Theoretical Physics and College of Physics Jilin UniversityChangchun130012China Center for Theoretical Physics of the Universe Institute for Basic Science (IBS)Daejeon 34051Korea

It is widely believed that the screening mechanism is an essential feature for the modified gravity theory. Although this mechanism has been examined thoroughly in the past decade, their analyses are based on a conventional fluid prescription for the matter-sector configuration. In this paper, we demonstrate a new formulation of the chameleon mechanism in F(R) gravity theory, to shed light on quantum-field theoretical effects on the chameleon mechanism as well as the related scalaron physics, induced by the matter sector. We show a possibility that the chameleon mechanism is absent in the early Universe based on a scale-invariant-extended scenario beyond the standard model of particle physics, in which a realistic electroweak phase transition, yielding the right amount of baryon asymmetry of Universe today, simultaneously breaks the scale invariance in the early Universe. We also briefly discuss the oscillation of the scalaron field and indirect generation of non-tensorial gravitational waves induced by the electroweak phase transition.

关键词： modified gravity beyond standard model thermal field theory

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Improvement in the information-oriented construction of temporary soil-retaining walls using sparse modeling

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Underground Space 2019年第3期4卷 210-224页

作者： Yu Otake Shinnosuke Kodama shinya Watanabe Niigata University Japan

This fundamental study investigates how“super-resolution”technology based on sparse modeling,which has attracted attention in various fields,can be applied to the information-oriented construction of temporary soil-retaining *** machine learning process adopted here is based on the analytical results of numerical computations that involve many preliminary assumptions related to soilretaining walls,rather than the collection of images utilized in the image reconstruction ***,bases for vectors related to the displacement of retaining walls are generated using efficient inverse analysis and“super-resolution”processing from sparse amounts of physical observation *** purpose is to improve the properties of the inverse problem by artificial interpolation based on numerical *** has been shown that the inverse analysis related to the displacement of retaining walls can be performed efficiently and that highly accurate predictions can be achieved even with limited physical *** general,the inverse analysis of retaining walls is an ill-posed ***,if the number of apparent observations reconverted by“super-resolution”technology exceeds the number of unknown parameters,then the displacement distribution of a retaining wall can be estimated *** original idea is to break down the inverse problem into two separate problems by addressing the earth pressure distribution acting on the retaining *** makes it possible to identify the part to which the nonlinear inverse problem can be applied and to facilitate the efficient estimation and interpretation of the results.

关键词： Information-oriented construction Temporary soil-retaining wall Super-resolution Sparse modeling

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