# overview
We are pursuing the research to understand fundamental principles in multidisciplinary discipline subjects and create next-generation manufacturing methods and processes by using our core knowledge in manufacturing, precision engineering, metrology, mechatronics, and optics and academia and industry experiences. Our primary academic interests are developing precision engineering-inspired approaches to manufacturing and metrology and, reciprocally, to use these approaches to better understand learning and create new knowledge in precision machine systems. We will try any possible approaches to solving the current manufacturing problems and characterizing those limits such as accuracy, precision, long-term reliability and fatigue properties, and then, we will create new manufacturing methods and processes and push its limits at the end.

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4007 Control Engineering, Mechatronics And Robotics

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4007 Control Engineering, Mechatronics And Robotics

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0906 Electrical And Electronic Engineering

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Finite Difference Frequency Domain (fdfd)

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0906 Electrical And Electronic Engineering

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4009 Electronics, Sensors And Digital Hardware

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5102 Atomic, Molecular And Optical Physics

# educationAndTraining[].organization.label
University of South Carolina - (Columbia, South Carolina, United States)

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Gwangju Institute of Science and Technology - (Gwangju, South Korea)

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Gwangju Institute of Science and Technology - (Gwangju, South Korea)

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Chung-Ang University - (Seoul, South Korea)

# publications[].label
Replication of a large size Fresnel type concentration lens for photovoltaic solar cell using spin coating

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A six-degree-of-freedom motion characterization of ballscrew-driven stage using a single unit of an optical encoer

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Optical displacement sensing system utilizing edge diffraction

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Non-destructive Inspection System for Self-piercing Riveting in CFRP-Metal Joining Product Using Stereoscopic Method with Robotic Manipulator

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Cosine Error-Free Metrology Tool Path Planning for Thickness Profile Measurements

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Preliminary study of photomask pattern inspection by beam-shaped knife-edge interferometry

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Measurement of a Six-degree-of-freedom Dynamic Characteristics using Angle Sensor-Implemented Grating Interferometry

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Fabrication and Molding Testing of the Blazed Gratings for Microoptics Applications

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Method and device for measuring motion error of linear stage

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Ultra thin type optical scanning device for portable information appliance

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Pressure-fed mechanism to compensate for motions and dynamic characteristics of compliant nanopositioning stages

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Multi-degree-of-freedom motion error measurement in an ultraprecision machine using laser encoder  Review

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Knife-edge interferogram analysis for corrosive wear propagation at sharp edges.

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Cross-coupling effect of large range XY nanopositioning stage fabricated by stereolithography process

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A curved surface-insensitive optical sensing technique for precision spindle health monitoring

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A simple optical system for miniature spindle runout monitoring

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Fabrication of Phase Reflection Sawtooth Gratings Optimized by Scalar and Vector Way by Using Diamond Cutting

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A novel method for through-silicon via characterization based on diffraction fringe analysis.

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Cosine Error Elimination Method for One-Dimensional Convex and Concave Surface Profile Measurements

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Total Internal Reflection (TIR) Lens Design for Surface Mount Techonology (SMT) LED Application

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Identification of mechanical and fatigue characteristics of polymers fabricated by additive manfacturing process

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Dimensional metrology of complex inner geometries built by additive manufacturing

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Dimensional metrology with X-ray CT: A comparison with CMM measurements on internal features and compliant structures

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A curved surface-insensitive optical sensing technique for precision spindle health monitoring

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Optical displacement sensing system utilizing edge diffraction

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Long-Range Nano-Scanning Devices Based on Optical Sensing Technology

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Compliance and control characteristics of an additive manufactured-flexure stage.

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Design and fabrication of a light emitting diode-based diffuser sheet-less light guide plate for lighting applications

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Dynamic and thermal characterization of additively manufactured pressure-fed flexures with internal fluidic channels

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Design and construction of a single unit multi-function optical encoder for a six-degree-of-freedom motion error measurement in an ultraprecision linear stage

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Polyvinylidene fluoride (PVDF) direct printing for sensors and actuators

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Electric poling-assisted additive manufacturing process for PVDF polymer-based piezoelectric device applications

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Long-term positioning effectiveness of additive manufactured-monolithic double compound notch type flexure stage

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Ultra thin light scanning apparatus for portable information device

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Characterization of 3D Printed Piezoelectric Sensors

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

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Novel displacement sensing technique utilizing knife-edge diffraction

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Serrated grating formation method and diffraction optical device manufacturing method using same

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Optimizing the fabrication process of a high-efficiency blazed grating through diamond scribing and molding

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Fabrication of small period blazed reflection gratings by fast atom beam dry etching method

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SPIE, the international society for optics and photonics

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Knife-edge interferometry for cutting tool wear monitoring

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A differentially amplified Hall effect displacement sensor for positioning control of a long-range flexure stage.

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Design and construction of six-degree-of-freedom motion error measurement system in a linear stage using angle sensor-combined grating interferometry

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Attrition/abrasive wear monitoring of cutting tools based on knife-edge interferometry

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Design and Fabrication of Diffractive Light-Collecting Microoptical Device with 1D and 2D Lamellar Grating Structures

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Novel design and sensitivity analysis of displacement measurement system utilizing knife edge diffraction for nanopositioning stages.

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Enhancement of knife-edge interferometry for edge topography characterization.

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Total Internal Reflection-Based High Efficiency Grating Design for a Metal-Free Polarizing Filter Applications Using Hybrid Optimization Procedure

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Fast Atom Beam-Based Fabrication of High-Efficienct Blazed Grating Using Slanting Angle Control of a Substrate

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

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Light-condensing device and method of fabricating the same

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Freeform surface profiling by iterative learning-extremum seeking control

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Fatigue property development and optimization of additive manufactured acrylonitrile butadiene styrene parts

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Damping Characteristics of Fluidic Pressure-Fed Mechanism for Positioning Applications

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Wafer Particle Inspection Technique Using Computer Vision based on Color Space Transform Model

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Compact curved-edge displacement sensor-embedded spindle system for machining process monitoring

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A curved edge diffraction-utilized displacement sensor for spindle metrology.

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A first review of optical edge-diffraction technology for precision dimensional metrology

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Live Demonstration: Characterization of 3D Printed Piezoelectric Sensors

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

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Precision Cutting Tool Wear Monitoring Method by Knife-Edge Diffraction Interferometry

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Condensing element using diffraction grating and manufacturing method thereof

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A review: additive manufacturing of flexure mechanism for nanopositioning system

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In-Process Cutting Temperature Monitoring Method Based on Impedance Model of Dielectric Coating Layer at Tool-Chip Interface

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Design of retrodiffraction gratings for polarization-insensitive and polarization-sensitive characteristics by using the Taguchi method.

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Fabrication of a Multi-Level Lens Using Independent-Exposure Lithography and FAB Plasma Etching

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

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Electric Poling-assisted Additive Manufacturing Process for Lead-free Piezoelectric Device Fabrication

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Spatially resolved stereoscopic surface profiling by using a feature-selective segmentation and merging technique

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Preliminary study of corona-assisted additive manufacturing process of piezoelectric thermopolymer

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Development of an innovative sensor for measuring two degree-of-freedom motions of single-axis linear nanopositionoing stage

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Phase locked loop based topography measurement of ultraprecision machined surface using the ball lensed and tapered fiber

# publications[].publisher
SPIE, the international society for optics and photonics

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Real-time measurement of two-linear and three-angular motion errors using a single optical linear encoder in a high precision stage

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Wafer particle inspection technique using computer vision based on a color space transform model

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Novel Additive Manufacturing-Based Electric Poling Process of PVDF Polymer for Piezoelectric Device Applications

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Light-condensing device and method of fabricating the same

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Characterization of thermally stable compliant structures with internal fluidic channels

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An investigation of cosine error for scanning probe measurements of freeform surfaces

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An optical measurement technique for dynamic stiffness and damping of precision spindle system

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Uncertainty investigation of grating interferometry in six degree-of-freedom motion error measurements

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Improvement of a periodic error compensation algorithm based on the continuous wavelet transform

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Preliminary study of phase-shifting strobo-stereoscopy for cutting tool monitoring

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Investigation of optical knife edge sensor for low-cost, large-range and dual-axis nanopositioning stages

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A monolithic linear motion platform driven by a piezoelectric and fluidic pressure-fed dual mechanism.

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A Single Camera Unit-based Three-Dimensional Surface Imaging Technique

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The optimization of sawtooth gratings using RCWA and its fabrication on a slanted silicon substrate by fast atom beam etching

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Assessing additive manufacturing processes with X-ray CT metrology

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A novel sensor for two-degree-of-freedom motion measurement of linear nanopositioning stage using knife edge displacement sensing technique.

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Phase-locked loop based on machine surface topography measurement using lensed fibers.

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A single camera unit-based three-dimensional surface imaging technique

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Positioning control effectiveness of optical knife edge displacement sensor-embedded monolithic precision stage

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Dicing wheel wear monitoring technique utilizing edge diffraction effect

# researcherOn[].label
Collaborative Research: Edge Surface Topography Characterization for Precision Sensing Technology

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

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I-CORPS Cutting Tool Wear Monitoring Sensor

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

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Photomask defect inspection and metrology for semiconductor lithography technology

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

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Collaborative Research: Improved Freeform Measurement through Fiber-based Metrology

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# researcherOn[].label
On-Machine Sensing Technology for Achieving High Precision, High Productivity and Low Power in Robotic Manufacturing

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National Institute of Standards and Technology - (Gaithersburg, Maryland, United States)

# researcherOn[].awardedBy.preferredLabel
DOC-National Institute of Standards and Technology

# etdChairOf[].label
Hegde, Himanshu (2021-12). Carbon Fiber Reinforced Polymer - Metal Self-Piercing Rivet Joining Process Modeling. Master's Thesis.

# etdChairOf[].label
Das, Omprakash (2021-05). Manufacturability and Bending Performance of Graded Steel Structures Fabricated by Selective Laser Melting. Master's Thesis.

# websites[].label
Precision Sensors and Instrumentation Lab