Yan, Jiwang

写真a

Affiliation

Faculty of Science and Technology, Department of Mechanical Engineering ( Yagami )

Position

Professor

Related Websites

External Links
Scopus Paper Info  
Paper Count: 416 Citation Count: 10361 h-index: 55

Click to view the Scopus page. The data was downloaded from Scopus API in July 12, 2026, via http://api.elsevier.com and http://www.scopus.com .

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Profile Summary 【 Display / hide 】

  • To create new products with high added value, we are conducting R&D on high-accuracy, high-efficiency, resource-saving manufacturing technologies through micro/nanometer-scale material removal, deformation, and property control. Our recent research focuses on ultra-precision mechanical fabrication, micro-nano forming/imprinting, micro electrical machining, laser machining, laser recovery, and laser Raman spectroscopy.

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Career 【 Display / hide 】

  • 2000.04
    -
    2001.09

    Research Associate, Tohoku University, Graduate School of Engineering

  • 2001.10
    -
    2005.03

    Associate Professor, Kitami Institute of Technology

  • 2005.04
    -
    2007.03

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2007.04
    -
    2012.03

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2012.04
    -
    Present

    Professor, Keio University, Faculty of Science and Technology

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Academic Background 【 Display / hide 】

  • 1991.07

    Jilin University, Faculty of Engineering, Department of Mechanical Engineering

    University, Graduated

  • 1994.03

    Jilin University, Graduate School, Division of Engineering, Department of Mechanical Engineering

    Graduate School, Completed, Master's course

  • 1996.01

    Tsinghua University, Graduate School, Division of Engineering, Department of Precision Instruments and Mechanology

    Graduate School, Withdrawal before completion, Doctoral course

  • 2000.03

    Tohoku University, Graduate School, Division of Engineering, Department of Mechatronics and Precision Engineering

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • Ph.D., Tohoku University, Coursework, 2000.03

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Precision Engineering/Mechanical manufacturing)

  • Nanotechnology/Materials / Material processing and microstructure control (Material Processing/Treatment)

  • Nanotechnology/Materials / Nano/micro-systems (Micro/Nanodevice)

  • Nanotechnology/Materials / Composite materials and interfaces (Applied Physical Properties/Crystal Engineering)

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Research Keywords 【 Display / hide 】

  • Ultraprecision machining

  • Micro/nano manufacturing

  • Laser processing

  • Electrical discharge machining

  • Nanomechanics

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Books 【 Display / hide 】

  • Ultraprecision Machining and Metrology

    J. Yan, CRC Press, 2025.09,  Page： 352

    Scope: 1-352

    　View Summary

    This comprehensive introduction to ultraprecision machining and metrology provides an essential foundation for students and engineers, offering an in-depth analysis of key methods, technologies, and practical applications. Ultraprecision machining is a critical enabling technology for producing high-value mechanical, optical, optoelectronic, and biomedical components with complex geometries and extreme precision. This book delivers a structured exploration of ultraprecision machining and metrology, covering essential topics such as system configuration, tooling, machining mechanism modeling, and surface characterization. Dedicated chapters on surface and subsurface metrology, as well as the machinability of both ductile and brittle materials, make it an indispensable resource for understanding machine design, manufacturing processes, and related materials science. Ideal for students and researchers, this book serves as a vital reference for those working in precision machining, MEMS, advanced manufacturing, and precision metrology.

  • Micro and Nanoscale Laser Processing of Hard Brittle Materials

    J. Yan and N. Takayama, Elsevier B.V., 2019.11,  Page： 242

    Scope: 1-242

  • Micro and Nano Fabrication Technology

    J. Yan (ed.), Springer Nature Singapore Pte Ltd., 2018.05

    Scope: 1-959

  • Comprehensive Materials Processing: Volume 1-13, Second edition

    Huang W., J. Yan , 2024.01,  Page： 180-204

    Scope: Chapter 10.08 Ultra-precision grooving technologies

    　View Summary

    Fabricating microgrooves on part surfaces is a way to provide advanced functionality of the parts, which has recently increased in several fields, such as biotechnology, optics, and aerospace. Considerable progress has been achieved in groove-cutting technology with the equipment development, process optimization and mechanisms understanding. This chapter reviews the ultraprecision cutting technologies for manufacturing of microgrooves and microgroove-based microstructures on various materials. Major cutting methods and their principles/mechanisms for microgrooving have been introduced. The main challenges in the cutting of microgrooves on ductile materials and brittle materials, respectively, are pointed out. Some innovations in groove-cutting technology are also highlighted. Several aspects in demand for further research and development are provided.

  • Advanced Ceramic Coatings: Fundamentals, Manufacturing, and Classification, R. K. Gupta, A. Motallebzadeh, S. Kakooei, T. A. Nguyen, A. Behera (eds.)

    P. J. Liew, J. Yan, C. Y. Yap, Elsevier B. V., 2023.06

    Scope: Chapter 19: Electrical discharge coating with quarry dust powder suspension,  Contact page： 433-460

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Papers 【 Display / hide 】

  • Atmosphere-dependent ablation behavior and mechanism in nanosecond laser processing of CFRP composites

    An H., Qian Y., Guo H., Xu P., Huang H., Yan J.

    Composites Part A: Applied Science and Manufacturing 210 2026.11

    ISSN  1359835X

    　View Summary

    Carbon fiber reinforced plastic (CFRP) is essential in lightweight structural design due to its exceptional mechanical and physical properties. Although laser processing offers an efficient method for machining CFRP, the substantial thermal damage inherent to the ablation process severely compromises structural integrity. To overcome these limitations, this study introduces an argon-assisted laser processing technique that effectively mitigates thermal damage, enabling fabrication of high-performance CFRP components. The laser ablation behavior of CFRP under air and argon atmospheres is systematically compared. Experimental and simulation results reveal that surface roughness and the width of heat-affected zone (HAZ) decrease with increasing scanning speed or scanning pitch. Crucially, argon-assisted laser processing significantly improves surface quality. Compared to processing in air, this approach yields reductions in surface roughness of up to 23.4%. Furthermore, under a laser power of 3.5 W, a scanning speed of 400 mm/s, and a scanning pitch of 30 μm, the HAZ on the right side of the laser-ablated region is reduced by a maximum of 74.3%. The underlying damage suppression mechanism involves laser energy attenuation, enhanced heat dissipation, and suppression of exothermic oxidation reactions. These findings establish argon-assisted laser processing as a promising strategy for high-fidelity manufacturing of advanced composite components.

  • Grain-size-dependent dynamic mechanical response and plastic deformation of the FeCoCrMnNi high-entropy alloy during high-strain-rate impact

    Acta Materialia  2026.07

  • Numerical study of waterjet-driven single-particle impact in AWJM

    Abdelhameed Y., Maher I., Yan J., El-Hofy H., Hassan M.A.

    International Journal on Interactive Design and Manufacturing (IJIDeM)  2026.06

    ISSN  19552513

    　View Summary

    Waterjet-driven single-particle impact is a fundamental mechanism governing material removal in abrasive waterjet machining (AWJM). To thoroughly investigate the complex fluid–solid interactions underlying this mechanism, a reliable framework that can precisely capture the physical behavior of the waterjet, abrasive particles, and workpiece erosion is essential. Therefore, a coupled numerical model based on smoothed particle hydrodynamics (SPH) and finite element method (FEM) is proposed to provide a physically consistent representation of all relevant impact phenomena. The model incorporated waterjet pressure, impact angle, abrasive mesh size, and particle radial position as the key process parameters. The results of waterjet-driven particle impact demonstrate that induced impact phenomena, particularly the stagnation zone, critically alter particle impact velocity, trajectory, kinetic energy damping across the jet radius. Moreover, the stagnation zone facilitates abrasive particle embedment by acting as a hydrodynamic confinement region that restricts particle escape. Such influences become even more pronounced with larger eroded craters or cavities. This is attributed to the expansion of stagnation region which amplifies hydrodynamic dissipation, deviates particle trajectory, and increases the probability of particle embedment. Notably, the developed SPH-FEM model successfully captured critical physical phenomena during impact that remain beyond the reach of the traditional computational fluid dynamics (CFD) approach. Overall, the revealed phenomena provide in-depth insight into impact behavior and offer clear guidance for devising a mechanistic framework to enhance material removal efficiency.

  • A novel machining program based on real-time two-variable polynomial calculation for fast tool servo diamond turning of freeform surfaces

    Tanikawa S., Yan J.

    Precision Engineering 102   354 - 376 2026.06

    ISSN  01416359

    　View Summary

    Compared with conventional axisymmetric lenses, freeform surfaces provide more flexibility in designing optical lenses and are expected to expand their demand in a wide range of fields, such as virtual and augmented reality and space telescopes. Fast tool servo-based diamond turning is a promising method for machining ultra-precision freeform surfaces. However, interpolation errors occur in machining programs generated with point cloud data, resulting in large form errors, especially for large-size freeform surfaces. To solve this problem, this study proposes a novel machining program that directly evaluates the optical design equation during machining, instead of using conventional point cloud-based machining programs. This method continuously controls the tool position to its ideal position at each control sampling point using two-variable polynomial calculations, thereby reducing interpolation errors. The polynomial coefficients are corrected based on those of the original design equation by considering the tool radius. The freeform surface machining results demonstrate that the proposed method achieves a 75.7% reduction in RMS form error while replacing a point cloud consisting of 993,600 points with only 20 polynomial coefficients. The proposed method also enables machining of multiple surfaces within a single setup, further demonstrating the effectiveness of the proposed machining program. While the form accuracy of the conventional method deteriorates in proportion to the surface curvature and distance from the spindle rotation center, the proposed approach achieves high-precision machining regardless of variations in such factors, distinctly outperforming the conventional bilinear interpolation method.

  • Laser nitriding enables robust wear resistance in Zr-4 alloy across multiple typical service environments

    Huang H., Xu P., Qian Y., Yan J.

    Tribology International 217 2026.05

    ISSN  0301679X

    　View Summary

    Due to its low thermal neutron absorption cross-section and adequate irradiation stability, Zr-4 alloys are widely used in nuclear reactors for critical components such as fuel rod cladding and cooling tubes. These components operate under diverse conditions, including high and ambient temperatures, as well as aqueous environments, where they are exposed to mechanical wear and corrosive media. However, the inherently limited surface hardness of Zr-4 alloy leads to poor wear resistance, potentially compromising component integrity. In this study, laser nitriding is employed to enhance the surface properties of Zr-4 alloy across multiple operating environments. Laser irradiation with a power level of 23 W in a nitrogen atmosphere increases the surface hardness to 8.75 GPa, representing a 495 % improvement over the as-received material. The laser-nitrided surfaces exhibit exceptional wear resistance, achieving maximum reductions in cross-sectional wear area of 90.8 % in room temperature air, 98.6 % in room temperature ultrapure water, and 52.1 % in air at 300 °C, compared to the as-received surface. This enhancement arises from the formation of hard nitride phases and a transformation in the dominant wear regime. Electrochemical tests reveal that the polarization resistance of the laser-nitrided surface processed at a relatively high laser power of 19 W is approximately 34 times higher than that of the as-received surface, demonstrating significantly improved corrosion resistance. These findings highlight laser nitriding as a highly effective surface engineering approach for improving the durability of Zr-4 alloy components in nuclear reactors, with important implications for enhancing the reliability of nuclear energy systems.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • A comparison of micro-machining characteristics between cutting and laser machining

    J. Yan

    Die and Mould Technology 41 ( 8 ) 108 - 109 2026.08

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work, Lead author

  • Femtosecond Pulsed Laser Machining of Fused Silica for Micro Cavities

    J. Yan

    Tool Engineers 66 ( 8 ) 83 - 87 2025.07

    Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

  • Laser-based micro/nano machining technologies for high-value added manufacturing

    J. Yan

    Machines and Tools 14 ( 11 ) 8 - 15 2024.11

    Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

  • Creating functional surfaces by micro/nano scale laser machining

    J. Yan

    Laser (Journal of the Japan Society of Laser Technology) 49 ( 1 ) 20 - 25 2024.11

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

  • Laser polishing technologies for additive-manufactured metal products

    J. Yan

    Journal of the Japan Society for Abrasive Technology 67 ( 8 ) 440 - 443 2023.08

    Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

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Presentations 【 Display / hide 】

  • Scale-bridging surface structuring for functional performance improvement of components

    J. Yan

    [International presentation]  7th CIRP CSI Conference on Surface Integrity 2024 (ブレーメン) , 

    2024.05
    , 

    Oral presentation (keynote)

  • Tool Dynamics-induced Surface Topography Error in Fast Tool Servo-Based Diamond Turning of Micro Dome Arrays

    T. Hashimoto, J. Yan

    [International presentation]  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

    2024.05
    , 

    Oral presentation (general)

  • Influences of tool tip geometry on surface/subsurface damage formation in nanoscratching of single-crystal 4H-SiC

    W. Huang, J. Yan

    [International presentation]  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

    2024.05
    , 

    Oral presentation (general)

  • Ultraprecision manufacturing for small optics

    J. Yan

    [International presentation]  Nanotechnology and Precision Engineering (NPE) International Series Forum (Online) , 

    2024.04
    , 

    Oral presentation (invited, special)

  • 自由曲面加工における工具姿勢に起因する切削メカニズム変化

    川上凜太朗，閻 紀旺

    [Domestic presentation]  精密工学会第31回学生会員卒業研究発表講演会 (東京) , 

    2024.03
    , 

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • Fast tool servo-based cutting of single-crystalline hard brittle materials for freeform optical components

    2025.04
    -
    2028.03

    基盤研究(A), Principal investigator

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Awards 【 Display / hide 】

  • JSPE Numata Memorial Paper Award

    T. Hashimoto, J. Yan, 2026.03, The Japan Society for Precision Engineering, Time delay compensation in high-speed diamond turning of freeform surface using independent fast tool servo with a long stroke

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • JSME Medal for Outstanding Paper

    L. Zhang, Y. Sato, J. Yan, 2024.04, The Japan Society of Mechanical Engineers, Optimization of fast tool servo diamond turning for enhancing geometrical accuracy and surface quality of freeform optics

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • IJEM Best Editor Award

    J. Yan, 2024.01, International Journal of Extreme Manufacturing (IJEM), IoP publishing

    Type of Award： Honored in official journal of a scientific society, scientific journal

  • JSPE Best Paper Award

    Lin Zhang, Allen Yi, J. Yan, 2023.03, The Japan Society for Precision Engineering, Flexible fabrication of Fresnel micro-lens array by off-spindle-axis diamond turning and precision glass molding

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 2022 IJEM Best Paper Award

    Y. Sato, J. Yan, 2023.03, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

    Type of Award： Honored in official journal of a scientific society, scientific journal

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Courses Taught 【 Display / hide 】

  • BACHELOR'S THESIS

    2026

  • INDEPENDENT STUDIES IN MECHANICAL ENGINEERING

    2026

  • MECHANICAL ENGINEERING PRACTICAL RESEARCH A

    2026

  • INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

    2026

  • DOCTORAL RESEARCH ON ENGINEERING AND DESIGN

    2026

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Memberships in Academic Societies 【 Display / hide 】

  • The Japan Society of Mechanical Engineers, 

    1997.04
    -
    Present

  • The Japan Society for Precision Engineering, 

    1997.04
    -
    Present

  • The Japan Society for Abrasive Technology, 

    2000.04
    -
    Present

  • Japan Society for Laser Technology (JSLT), 

    2022.01
    -
    Present

  • Japan Laser Processing Society (JLPS), 

    2009.01
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2025.03
    -
    Present

    Fellow, Society of Manufacturing Engineers (SME)

  • 2024.08
    -
    Present

    Fellow, The International Academy for Production Engineering (CIRP)

  • 2024.04
    -
    Present

    Fellow (foreign), The Engineering Academy of Japan (EAJ)

  • 2022.04
    -
    Present

    Fellow, The International Society for Nanomanufacturing (ISNM)

  • 2022.03
    -
    Present

    Director, Executive Director, Chairman of Publication Sector, Chairman of Journal Review Board, Japan Society of Precision Engineering (JSPE)

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