Title: Agent-based Modeling and Simulation in the Generation of Digital Twins for Smart Manufacturing Abstract Over the years, the use of modeling and simulation (M&S) has been boosted for Digital Twinning of production systems. To keep pace with the technological changes, this talk covers three topics: i) M&S in...
Title: Applied Laser Processing for Semiconductor Fabrication Presenter: Prof. Joonghan Shin (Division of Mechanical Engineering and Automotive Engineering, Kongju National University) Abstract: Over the last ten years, laser processing has played a key role in the fabrication of semiconductor devices. Compared to the conventional heating process using a furnace or a lamp, laser processing has the following unique advantages: (a) local heating is possible with a small beam sot size; (b) raising the temperature of the material beyond its melting point is easily attainable due to high-intensity lasers; and (c) heating of shallow layer of the material just below the surface under the low thermal budget is possible by using an optimal wavelength and an annealing time in the range of milliseconds to nanoseconds. Due to the abovementioned characteristics, laser processing has been widely used in various applications for semiconductor manufacturing. This seminar aims to introduce the major applications (dopant activation, silicidation, void removal, and re-crystallization) of laser processing and the characteristics of laser equipment used for semiconductor manufacturing. ...
Introduction to Korea Space Launch Vehicle-II (Nuri) Korea Space Launch Vehicle-II (KSLV-II) has been developed to launch 1.5 ton mass to Sun Synchronized Orbit. KSLV-II is a three-stage rocket. The first stage is propelled by four 75 ton class liquid rocket engine of which propellants are liquid oxygen...
Nanoscale Biomimetic Materials for Sensor and Actuator Applications Byung Yang Lee School of Mechanical Engineering, Korea University, Seoul, Korea Nanoscale materials have high surface-volume ratio, making them ideal building blocks for sensors and actuators. In particular, starting from very few and simple building blocks such as collagen fibrils, nature easily builds hierarchical and complex supramolecular structures which are often hard to imitate with current top-down microfabrication techniques. Recently, with the development of diverse assembly methods of nanomaterials, we can obtain biomimetic structures with diverse optical, mechanical, and electrical properties using bottom-up approaches. Sometimes, the properties of such biomimetic materials, when exposed to certain physical or chemical stimuli, can change enough to be utilized for sensor or actuator applications. For example, some filamentous viruses can be assembled into colorful films on solid substrates, the colors of which can change when exposed to organic solvents and volatile organic compounds. Also, these same films, when applied with mechanical pressure, can exhibit piezoelectric properties, where mechanical pressure can be transduced to electrical signal, opening a possibility of using these structures as mechanical force sensors. In this talk, we will discuss on the current state of applying nanoscale materials for sensor and actuator application....
Title Soft Interfaces: From Microfluidics to Kitchen Abstract Living matter, from plants and animal cells, comprises complex materials with various phases and interfaces. A close look at how these soft interfaces arise and form certain shapes with functions will not only deepen our understanding of nature but also inspire the design and engineering of materials for novel applications. In this talk, I will first introduce hydrodynamic synchronization, which can be observed in swimming organisms, and explain how hydrodynamically interacting fluid-fluid interfaces can act as coupled oscillators leading to the discovery of a synchronized droplet generation. Second, I will present methods to fabricate nature-inspired shapes of microstructure to provide multifunctionality to the material, such as wrinkles on curved surfaces and multi-compartment microfibers, by exploiting oil-water interfaces. Lastly, I will investigate biological cells as soft matter to study the dependence of their motility on the geometry of cells and confinements as in complex tissue environments. We can even use materials found in our kitchen to understand the physicochemical roles of complex fluids in determining the shapes and motility of nature. My ultimate research goal in soft interfaces is to apply the knowledge from complex fluids experiments to emerging technologies of biomedical applications....
Data-driven reduced-order model for efficient prediction of structural dynamics Haeseong Cho Department of Aerospace Engineering, Jeonbuk National University, Korea With the advent of the 4th industrial revolution, the next-generation mechanical and aerospace industries require multi-disciplinary convergence technology, and multi-disciplinary simulations are drawing attention as an important tool for the design and operation of next-generation mechanical and aerospace systems. Recently, a data-driven model reduction method using data analysis or machine learning, is emerging, and is expected as a base technology for a digital twin for a complex multi-disciplinary system. In general, the methods that can be used to define the reduced-order model of a dynamic system are the intrusive model reduction method, which projects the governing equations of the system in a generalized coordinate system, and the non-intrusive model reduction method, which defines the input and output relationship of the data of interest. In this talk, the model reduction methods that defines a reduced model using the solution of a dynamic system such as the displacement of a structure will be introduced....
Abstract Live-line maintenance works for power transmission lines are very dangerous due to the dangers of high voltage and the risks of falling from heights. For this reason, there has been an increasing manpower shortage in this field and new active techniques using innovative robots have been required. This...
