KEIO RESEARCHERS INFORMATION SYSTEM

Profile Summary 【 Display / hide 】

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.

Career 【 Display / hide 】

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

display all >>

Academic Background 【 Display / hide 】

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

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

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

Research Areas 【 Display / hide 】

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)

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Ultraprecision machining

• Micro/nano manufacturing

• Laser processing

• Electrical discharge machining

• Nanomechanics

Books 【 Display / hide 】

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.

  • Access to Document (DOI)

• 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.

  • Access to Document (DOI)

• 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

display all >>

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• 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.

  • Access to Document (DOI)

• Interactive effect of drill margin and ultrasonic-assistance on hole geometry: a criteria-based optimization for drilling aluminum 7075-T6

  Abdelaziz A., Yan J., Hossam M., Maher I.

  Production Engineering 20 ( 2 )  2026.05

  ISSN  09446524

  　View Summary

  Double-margin drills are expected to provide radial stability and Ultrasonic-Assisted Drilling (UAD) can reduce cutting forces and torque, but the academic literature on double-margin drills is limited, and their combined effect with UAD is not well understood. To investigate this interactive effect, this paper analyzes the geometric accuracy of holes in Aluminum 7075-T6 using a full factorial design of experiments. The influence of drill margin, ultrasonic-assistance, spindle speed, and feed rate on hole cylindricity and circularity errors at entry and exit were analyzed. Analysis of Variance is used to identify which factors and interactions are statistically significant. The most significant factor affecting the hole cylindricity error was a strong interaction between the drill margin and the spindle speed. The use of double-margin drills improved the cylindricity by 44% at low speed compared with using single-margin drills. However, the use of double-margin drill degraded the cylindricity by 29% at high speed. For the hole circularity, single-margin drills consistently provided a good performance, while applying UAD was often detrimental particularly when combined with double-margin drills. Furthermore, the exit circularity errors were approximately double those at the entry, highlighting the significant instability of the drill at breakthrough phase. The results revealed complex and often conflicting interactions. To model and accurately predict the conflicting interaction and non-linear behavior, a series of Adaptive Neuro-Fuzzy Inference System models were developed and validated. The central conclusion is that a universal optimization is inadequate; this paper provides both the statistical proof and the predictive models necessary for a criteria-based approach, where parameters are selected based on the single most critical geometric feature.

  • Access to Document (DOI)

• Fundamental investigation of femtosecond pulsed laser micromachining mechanisms for single-crystal diamond

  Koshiishi K., Yamamuro Y., Yan J.

  Precision Engineering 100   1 - 12 2026.02

  ISSN  01416359

  　View Summary

  Single-crystal diamond (SCD) has excellent mechanical, thermal and physical properties that rank among the highest of all substances. It has widespread applications in diverse fields such as cutting tools, optical windows, spintronics and power electronics. However, SCD is difficult to machine via mechanical processes due to its extremely high hardness. In recent years, laser processing has attracted attention since it enables non-contact efficient machining regardless of material hardness. In this study, femtosecond pulsed laser, which is considered to be capable of high-precision machining with low thermal effect, was used for micromachining of SCD, and the effects of laser irradiation parameters on the surface texture, roughness and profile geometry, as well as subsurface material structural changes, were investigated. It was found that even under femtosecond pulses thermal effect existed and that using a higher laser scanning speed was helpful to eliminate thermal cracks formation. The laser machined surfaces were covered with nanoscale periodical surface ripples with a surface roughness in the level of 0.10 μm Ra. Raman analysis of the SCD surface after laser machining showed that amorphous carbon and nanocrystalline graphite existed as a composite material. The graphitization depended on the laser fluence and hatching width and was particularly pronounced at low fluence and small hatching width. It was also demonstrated that acid cleaning could remove most of the graphite layer and reduce surface roughness. As samples, a few three-dimensional micro cavities with flat bottoms and sharp corners were created. This study demonstrates that femtosecond pulsed laser is a suitable method for machining micro three-dimensional shapes in SCD while it is important to optimize the laser machining conditions to avoid thermal damage and improve the surface quality.

  • Access to Document (DOI)

• A novel approach for reducing thermal damage in laser processing of CFRP through synergistic cryogenic cooling and lateral gas blowing: Mechanism analysis and parameter optimization

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

  Composites Part A: Applied Science and Manufacturing 204 2026.01

  ISSN  1359835X

  　View Summary

  Carbon fiber reinforced plastic (CFRP), as a critical lightweight structural material, has been widely used in automotive and aerospace industries due to its exceptional mechanical properties. However, laser processing of CFRP generally induces severe thermal damage and compromises surface integrity, hindering the fabrication of high-quality components. To overcome this limitation, this study introduces a synergistic cryogenic cooling and lateral gas blowing (SCCLGB) strategy to effectively mitigate thermal damage during laser processing of CFRP. The surface characteristics of CFRP processed using SCCLGB are systematically investigated. Compared with conventional laser processing, SCCLGB reduces the width of the heat-affected zone (HAZ) by up to 93.7%. The underlying mechanisms of thermal damage suppression involve inhibited heat transfer, enhanced convective cooling, and reduced oxidative degradation. Regression models for predicting HAZ width and material removal rate (MRR) are developed and validated experimentally. The individual and interactive effects of processing conditions on both HAZ and MRR are thoroughly analyzed. Practical guidelines for selecting optimal processing conditions based on specific manufacturing requirements are also established. This work establishes a novel strategy for high-precision manufacturing of CFRP, offering a promising pathway toward its potential application in relevant industrial fields.

  • Access to Document (DOI)

• Micromachining of Carbon Fiber Reinforced Plastics Using Femtosecond Pulsed Laser

  Konishi, Y; Yan, JW

  NANOMANUFACTURING AND METROLOGY 8 ( 1 )  2025.12

  ISSN  2520-811X

  　View Summary

  Microscale grooves and holes were fabricated in carbon fiber reinforced plastics (CFRPs) using femtosecond pulsed laser irradiation, and the characteristics and mechanisms of laser processing were investigated. The relationship between laser fluence and ablation depth was established by measuring the cross-sectional profiles of the microgrooves produced at different laser fluences. Furthermore, the effect of the angle between the edge of the micro holes and the carbon fibers was examined by analyzing the edges and wall surfaces of circular and rectangular holes. Experimental results revealed that the laser processing mechanism was strongly dependent on fiber orientation due to significant heat conduction along carbon fibers. The findings of this study contribute to a deeper understanding of the ultrashort pulsed laser processing characteristics and mechanisms for creating small holes in CFRPs and emphasize the possibility of drilling high-precision holes that can be used in the direct bonding of sensors/IC chips to CFRPs.

  • Access to Document (DOI)

display all >>

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

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

• SiC mold cutting, LIPSS formation, and graphene coating for high-performance glass optics

  Yan, Jiwang

  科学研究費補助金研究成果報告書 2023

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• 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

• Ultraprecision ductile mode machining of hard brittle materials

  J. Yan

  Journal of the Japan Society of Mechanical Engineers 125 ( 1247 ) 11 - 14 2022.10

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

display all >>

Presentations 【 Display / hide 】

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)

display all >>

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

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

Awards 【 Display / hide 】

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

display all >>

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• BACHELOR'S THESIS

  2025

• ULTRAPRECISION MACHINING AND METROLOGY

  2025

• SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

  2025

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2025

• INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

  2025

display all >>

Memberships in Academic Societies 【 Display / hide 】

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

display all >>

Committee Experiences 【 Display / hide 】

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)

display all >>