A5060112836- Advanced machining processes and optimization
- Manufacturing Process and Optimization
- Mechanical Engineering and Vibrations Research
- Dynamics and Control of Mechanical Systems
- Vibration and Dynamic Analysis
- Advanced Sensor and Energy Harvesting Materials
- Thermal Analysis in Power Transmission
- Mechanical Failure Analysis and Simulation
- Tactile and Sensory Interactions
- Robotic Mechanisms and Dynamics
- Tunneling and Rock Mechanics
- Photonic and Optical Devices
- Drilling and Well Engineering
- Terahertz technology and applications
- Engineering Applied Research
- Metallurgy and Material Forming
- Advanced Fiber Optic Sensors
- Real-time simulation and control systems
- Advanced Measurement and Metrology Techniques
- Metal Forming Simulation Techniques
- Soil Mechanics and Vehicle Dynamics
- Semiconductor Quantum Structures and Devices
- Transportation Safety and Impact Analysis
- Metal Alloys Wear and Properties
- Vehicle Dynamics and Control Systems
Korea Research Institute of Standards and Science
2010-2025
Korea Institute of Industrial Technology
2016-2024
Korea Evaluation Institute of Industrial Technology
2016-2023
Pusan National University
2013-2016
Abstract Continuously printable electronics have the significant advantage of being efficient for fabricating conductive polymer composites; however, precise tailoring 3D hierarchical morphology nanocomposites in a simple dripping step remains challenging. Here, we introduce one‐step direct printing technique to construct diverse microdome morphologies influenced by interfacial Marangoni effect and nanoparticle interactions. Using jet dispenser continuous processing, effectively fabricated...
Herein, a multimodal tactile sensing module that can improve the dexterous manipulation capabilities of robots with parallel grippers is reported. The sensor consists 4 × matrix 3‐axis force array (with spacings 2 mm) and single‐temperature sensor. uses inorganic silicon gold as materials for detection strain temperature polymer‐based elastomer to encapsulate layer. equipped readout circuitry signal processing. Within measurable range (≈1.5 N) cell, prototype exhibits repeatability error...
The spring-in phenomenon of the composite parts can affect assembly process. This study aims to predict carbon fiber reinforced plastic (CFRP) part. Here, we CFRP part using a coupled analysis forming and cooling processes during stamping First, simulation entire process, such as transfer laminate, gravity analysis, was performed obtain temperature distribution Subsequently, finite-element (FE) process conducted shaped data obtained in simulation. Finally, manufactured compared with results FE
The spring-in phenomenon of the composite parts can affect assembly process. This study aims to predict a carbon fiber reinforced plastic (CFRP) part. Here, we CFRP part using coupled analysis forming and cooling processes during stamping First, simulation entire process, such as transfer laminate, gravity analysis, was performed obtain temperature distribution Subsequently, finite-element (FE) process conducted shaped data obtained in simulation. Finally, manufactured compared with results FE
An analytical vehicle model is essential for the development of design and performance. Various models have different complexities, assumptions limitations depending on type analysis. accurate full in representing behaviour order to estimate dynamic system performance such as ride comfort handling. experimental developed this article, which employs kinematic compliance data measured between wheel chassis. From these data, a model, includes effects due geometry changes, has been developed....
Modern robots fall behind humans in terms of the ability to discriminate between textures objects. This is due fact that lack detect various tactile modalities are required Hence, our research team developed a robot fingertip module can objects via direct contact. based on sensor with multimodal (3-axis force and temperature) sensing capabilities. The was able forces vertical (Z-axis) direction as small 0.5 gf showed low hysteresis error repeatability less than 3% 2% measurement range 0–100...
One of the factors that influence dynamic characteristics machining systems is cutting tool. Cutting tools are very diverse, and receptance coupling substructure analysis (RCSA) essential for analyzing each For RCSA, a full matrix equipment essential. In this study, rotational degree-of-freedom was estimated analyzed using translational receptance. Displacement/moment according to distance response point first-and second-order finite difference methods. The rotation/moment point....
This study investigated the impact of boron and copper on microstructure mechanical properties Spheroidal graphite Cast Iron (SCI). The addition increased ferrite content, while stability pearlite. interaction between significantly content. Differential Scanning Calorimetry (DSC) revealed that decreased enthalpy change α + Fe3C -> γ transformation transformation. reduced tensile yield strength but elongation energy. findings provide valuable insights into effect SCI, facilitating...
This study examines the impacts of copper and boron in parts per million (ppm) on microstructure mechanical properties spheroidal graphite cast iron (SCI). Boron's inclusion increases ferrite content whereas augments stability pearlite. The interaction between two significantly influences content. Differential scanning calorimetry (DSC) analysis indicates that alters enthalpy change α + Fe3C → γ conversion conversion. Scanning electron microscope (SEM) confirms locations boron. Mechanical...
Hydrogen refueling stations are pivotal for renewable energy and carbon neutrality; however, they encounter challenges owing to equipment malfunctions. This study addresses the use of time-series forecasting techniques predict diagnose critical failure at these stations. An analysis station was conducted create scenarios potential malfunctions in compression equipment. Techniques such as Recurrent Neural Network(RNN), Long Short-Term Memory network (LSTM), Gated Unit(GRU) have been employed...
This paper proposes an optimal button arrangement of a percussion drill bit and its operating condition to improve drilling efficiency. A new evaluation method is introduced for the that utilizes superimposed impact area, blank deviation moment as quantitative indices evaluate buttons on rock surface. To determine conditions, progressive metamodel-based design optimization was conducted using analysis response, then solution determined through iteration. Consequently, all were reduced...
This paper presents a high-performance flexible tactile sensor based on inorganic silicon electronics. We created 100 nm-thick semiconducting ribbons equally distributed with 1mm spacing and 8×8 arrays to sense the pressure distribution high-sensitivity repeatability. The organic rubber substrate was used as spring material achieve both of mechanical flexibility robustness. A thin copper layer deposited patterned top sensing create temperature layer. fabricated tested through series...
This paper presents the characteristics of energy absorption in an expansion tube type impact absorber that is applied to a high weight drop tester and use response surface methodology predict absorption. In order identify absorption, set finite element analysis was conducted with Abaqus Explicit. Moreover, ISCD-II sampling method first polynomial were used build surface. As result, we demonstrated could be controlled by four main design variables, namely pipe's thickness, inner radius,...
For an engineering feasibility study, we studied a simple design to improve NCSS (nanocarbon composite strain sensor) sensitivity by using its geometric pattern at macro scale. We fabricated bulk- and grid-type sensors with different filler content weights (wt.%) sensor lengths investigated their characteristics. also proposed unit gauge factor model of find correlation between length sensitivity. was improved proportional incremental ratio were able achieve better linear consistent data...
For designing working devices of construction equipment, it is necessary to consider not only sufficient ability but also available range. Therefore, important select the appropriate pivot positions links. This paper presents a study on selection points links used in equipment. To analyze effect each point, design program for developed. A conventional method requires complicated process because needs create certain position manually evaluate its performance. However, developed includes an...