A5021153034- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Advanced Memory and Neural Computing
- Aerosol Filtration and Electrostatic Precipitation
- Neuroscience and Neural Engineering
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Innovative Energy Harvesting Technologies
- CCD and CMOS Imaging Sensors
- Ferroelectric and Negative Capacitance Devices
- Transition Metal Oxide Nanomaterials
- Advanced Vision and Imaging
- Risk and Safety Analysis
- Material Properties and Processing
- Air Quality and Health Impacts
- Electronic Packaging and Soldering Technologies
- Icing and De-icing Technologies
- Organic Electronics and Photovoltaics
- Vehicle emissions and performance
- Autonomous Vehicle Technology and Safety
- Robotic Path Planning Algorithms
- Tactile and Sensory Interactions
- Nanomaterials and Printing Technologies
- Engineering Applied Research
- Neural dynamics and brain function
Pusan National University
2019-2021
Chungnam National University
2017-2019
Myongji University
2018-2019
Chungbuk National University
2019
Daejeon University
2018
Yonsei University
2014
International Council on Mining and Metals
2009
Institut de Chimie de la Matière Condensée de Bordeaux
2009
Performance enhancement of triboelectric nanogenerators (TENGs) has been largely limited by the relatively low output current density. Thus, extensive research efforts have made to increase In this respect, work presents a method effectively density TENGs adopting polarized ferroelectric polymers and MoS2 composite. Specifically, compositing bulk flakes with both Nylon-11 PVDF-TrFE, respectively, charge each charging surface was significantly increased. addition, proper polarization...
Ultrafine particulate matters (PMs) are an imminent threat to the human respiratory system, as their sizes comparable and even smaller than tissues. To cope with this situation, researchers have developed commercialized various personal dust proof masks. However, because of relatively thick filter membrane guarantee filtering efficiency, a huge pressure drop across active layer is inevitable breathing through it becomes uncomfortable. In work, we investigated performance electrospun...
We report a simple method to realize multifunctional flexible motion sensor using ferroelectric lithium-doped ZnO-PDMS. The layer enables piezoelectric dynamic sensing and provides additional information more precisely discriminate different motions. PEDOT:PSS-functionalized AgNWs, working as electrode layers for the layer, resistively detect change of both movement or temperature. Thus, through optimal integration elements, limit, accuracy, functionality can be further expanded. introduced...
A combined system of microneedles and a triboelectric nanogenerator (TENG) was designed utilized as portable electrically active drug delivery device.
We demonstrate strong, analog, reversible, and nonvolatile memcapacitance in a Si-based MOS (metal-oxide-semiconductor) memcapacitor with an ITO (In-Sn-O)/HfOx/Si structure. Both accumulation depletion capacitances change sequentially reversibly upon repeating voltage application respect to polarity. This is thought be induced by oxygen ions' migration between HfOx layers, which changes the permittivity states Si ITO. The has potential applied gate stack of field-effect-transistor for memory...
Abstract Recently, there is a growing demand of high‐performance, lightweight, and light‐permeable air filters due to severe pollution. Nanofiber have been actively investigated filter out ultrafine particulate matters (PMs) in air. Among various polymer nanofibers, Nylon‐6 nanofibers widely adopted fabricate owing their mechanical strength chemical stability. However, the filtering efficiency relatively low when it has high light transmittance. Thus, thick nanofiber layer required ensure...
We demonstrate single- and double-gate synaptic operations of a thin-film transistor (TFT) with stack consisting an Al-top-gate/SiO x /TaO /n-IGZO on SiO2/n+-Si-bottom-gate substrate. This TFT exhibits tunable drain current, mimicking weight modulation in the biological synapse, upon repeatedly applying gate voltages. The current features are analog, voltage-polarity dependently reversible, strong dynamic range multiple orders magnitude (∼104). These occur as consequence changes mobility...
We report high-performance triboelectric nanogenerators (TENGs) employing ferroelectric nanoparticles (NPs) embedded in a sponge structure. The BaTiO3 NPs inside the structure play an important role increasing surface charge density by polarized spontaneous dipoles, enabling packaging of TENGs even with minimal separation gap. Since friction surfaces are encapsulated packaged device structure, it suffers negligible performance degradation at high relative humidity 80%. also demonstrated...
A crossbar array of Pt/CeO2/Pt memristors exhibited the synaptic characteristics such as analog, reversible, and strong resistance change with a ratio ∼103, corresponding to wide dynamic range weight modulation potentiation depression respect voltage polarity. In addition, it presented timing-dependent responses paired-pulse facilitation short-term long-term memory transition by increasing amplitude, width, repetition number pulse reducing interval time between pulses. The loss was fitted...
For the development of high performance triboelectric generators (TENGs), it is required to have facile methods adjust properties friction surfaces.
We report a variety of synaptic behaviors in thin-film transistor (TFT) with metal-oxide-semiconductor gate stack that has Pt/HfO x /n-type indium-gallium-zinc oxide (n-IGZO) structure. The three-terminal TFT exhibits tunable weight drain current modulation upon repeated application and voltages. is analog, voltage-polarity dependent reversible, strong dynamic range multiple orders magnitude (>104). This process emulates biological potentiation, depression, excitatory-postsynaptic current,...
In this paper, a stretchable silver electrode having high stretching capability and good stability is demonstrated using poly (dimethyl siloxane) (PDMS) substrate bonding technique. By two electrodes (bonding electrode), low initial sheet resistance under 38% strain condition were achieved. It was also shown that the has 1000-cycle prolonged stress (15% strain). The origin of sample explained as percolation current path between top bottom electrodes. Using resistor network model,...
In this paper, we proposed image based indoor automatic flight system of quadcopter to follow a user defined guideline on the floor by utilizing its own camera installed in bottom drone for autonomous system. For configure hardware with and GCS using notebook. analyzes sensor signals including signal from send motor command quadcopter. The algorithm is divided into an processing control This analyzed camera, estimated direction position guideline, sent commands drone. We verified modeling...
This paper proposes a numerical analysis method for improving risk assessment of radio frequency (RF) hazards. To compare the results conventional code analysis, values required dipole antenna assessment, which is widely used in offshore plants based on British standards (BS) guide, are calculated using proposed analysis. Based BS (published document CENELEC technical report (PD CLC/TR) 50427:2004 and international electrotechnical commission (IEC) 60079 an plant antenna, initial full...
Abstract not Available.
This study analyzes the crosstalk effects caused by geometry of holes in a cable tray offshore plants. Using analysis results, we determine optimal hole that can effectively reduce weight under minimum crosstalk. It was previously shown metal trays among cables. However, impact not considered. demonstrates on In addition, an algorithm is proposed to tray. The simulation results validate and be useful for designers with holes.