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About ACTIVE

Welcome to "Active materials and dynamic systems Laboratory" @ KAIST.

The ACTIVE laboratory was founded in 2010 and is directed by Professor Il-Kwon Oh.All members of our lab are working with various research topics, focusing on the smart materials, adaptive structures, intelligent systems, and nanotechnology.Four different researchtopics in the ACTIVE laboratory are addressed as follows:

Smart materials

The research concentrates on the development and applications of smart materials. Research interests in smart materials include (1) piezoelectric actuators, (2) ultrasonic sensors (3) artificial muscles and electro-active polymers and (4) nature-inspired technology. Thermally, magnetically and electrically responsive materials are all functional materials that we are developing.Also, the control techniques of smart material systemshave been studied for realistic applications.

Adaptive structures

The research focuses primarily on design and control methodologies for smart structures, in which the sensing and actuation functionalities of smart materials are integrated with load-bearing structures.Vibration and noise control, shape and position control, energy harvesting, and health monitoring systems can be implemented by using smart functional materials. Also,acoustic and elasticmetamaterials integrated with smart materials have been extensively investigated for underwater sonar applications, acoustic cloaking, acoustic lens, energy harvesting, vibration control, high sensitive sensors and so on.

Intelligent systems

Ocean energy harvesting systems including offshore wind turbines, current power generators, and EAP-based generators have been investigated in this group. Especially, novel current power generatorsbased on self-excited oscillations, which are generated from dynamic instability of fluid-structure interactions, are under development. The design and control strategies should be carefully applied to develop efficient intelligent ocean energy systems. Also, to reduce the air emission from ships, we are developing fuel cell powered unmanned surface vehicles. The unmanned surface vehicles can be used for military services and environmental monitoring.

Nanotechnology

Major focus of nanotechnology in the ACTIVE laboratory is to synthesize high-quality grapheneflakes and sheets, metal-decorated graphenes and novel 3D carbon nanostructures with several functionalities. Furthermore, we are investigating realistic applications of graphenenanomaterialsin the fields of sensors and actuators, transparent electrodes, supercapacitors, lithium ion batteries, EMI-stealth, nano-composites, and biomedical active devices.

The ACTIVE research projects have been funded by various industrial and government sponsors including Korean Ministry of Education, Science and Technology (MEST), Ministry of Knowledge Economy (MKE), Agency for Defense Development (ADD), National Research Foundation (NRF), Korea Industrial Technology Foundation (KOTEF), National Research Foundation of Korea (NRF), Korea Register (KR), Korea Energy Management Corporation (KEMCO),LG Electronics and etc.

The ACTIVE laboratory has a variety of experimental and computational facilities. Experimental equipment includesUniversal Testing Machine(UTM), Multichannel Potentiostat/Galvanostat, Probe station, Electrospinning machine,Source meter, Rotator,Rotary evaporator, Vacuum oven, Ultrasonic cleaner, Spin coater, High temperature furnace, High speed bipolar amplifier,Chemical Vapor Deposition(CVD), Optical microscope, Induction heating system, Microwave Reactors, Mechanical Shaker, Laser Displacement Sensor, FFT analyzers,Hydrophones,etc.Computation facilities include NI-PXI set-up, Control system using dSPACE, etc., and software for multiphysics coupling, acoustic wave propagations and structural dynamic analyses. Also, various specialized testbeds have been developed in the lab for experimental investigations, such as experimental setup for precise electromechanical bending actuation performance measurement of EAP actuator, li-ion battery test setup, capacitive deionization test setup, active vibration control setup of cantilever beam, etc.In addition, the ACTIVE laboratoryhas an active educational environment related with smart materialsand systems.

The ACTIVE members are welcoming you to join us. Please contact Professor Il-Kwon Oh (ikoh@kaist.ac.kr)if you are interested in doing research work as a graduate student or postdoc to explore promising research topics.