김일환 교수

Abstract We have prepared a series of polylactide/exfoliated graphite (PLA/EG) nanocomposites by melt‐compounding and investigated their morphology, structures, thermal stability, mechanical, and electrical properties. For PLA/EG nanocomposites, EG was prepared by the acid treatment and following rapid thermal expansion of micron‐sized crystalline natural graphite (NG), and it was characterized to be composed of disordered graphite nanoplatelets. It was revealed that graphite nanoplatelets of PL

A hydrous ruthenium oxide , thin-film electrode with high specific capacitance and good high rate capability was prepared by electrostatic spray deposition for an electrochemical capacitor application. The X-ray diffraction measurements indicated that the as-prepared transformed to crystalline when annealed at temperatures over . It was shown that the specific capacitance change during annealing is closely related to the change in the number of reaction sites. The specific capacitance of increas

A ruthenium oxide thin film electrode with an average specific capacitance of 650 F/g and good high rate capability was prepared by electrostatic spray deposition (ESD). This technique is a one-step process of preparing ruthenium oxide thin film electrode compared with a multistep sol-gel process and has features of low-temperature synthesis and easy control of surface morphology. While as-prepared hydrous ruthenium oxide thin film was in an amorphous phase, the hydrous ruthenium oxide thin film

Laser treatment using low fluence for melasma was previously introduced to overcome postinflammatory hypermelanosis after Q-switched laser therapy. However, research on the mechanism of this treatment is very limited. In this study, a collimated low fluence 1064 nm Q-switched Nd:YAG laser with a pulse width of <7 ns was applied using top-hat beam mode. The aim of this study was to investigate the mode of action of this laser treatment through electron microscopy. The effectiveness of this treatm

Ruthenium oxide was electrodeposited onto a carbon nanotube (CNT) film substrate with a three-dimensional porous structure at the nanometer scale. For comparison, ruthenium oxide was prepared on a Pt plate and carbon paper substrate. Microstructures of the ruthenium oxide-based electrodes examined by scanning and transmission electron microscopy showed that the ruthenium oxide layers ( thickness) were electrochemically deposited on the surface of the multiwalled CNT. The ruthenium oxide on CNT f

Driver assistance systems have become a major safety feature of modern passenger vehicles. The advanced driver assistance system (ADAS) is one of the active safety systems to improve the vehicle control performance and, thus, the safety of the driver and the passengers. To use the ADAS for lane change control, rapid and correct detection of the driver's intention is essential. This study proposes a novel preprocessing algorithm for the ADAS to improve the accuracy in classifying the driver's int

Cdc42 is a signaling protein important for reorganization of actin cytoskeleton and morphogenesis of cells. However, the functional role of Cdc42 in synaptic plasticity and in behaviors such as learning and memory are not well understood. Here we report that postnatal forebrain deletion of Cdc42 leads to deficits in synaptic plasticity and in remote memory recall using conditional knockout of Cdc42. We found that deletion of Cdc42 impaired LTP in the Schaffer collateral synapses and postsynaptic

An amorphous and hydrous vanadium oxide thin film of approximate thickness was electrochemically prepared onto a carbon nanotube (CNT) film substrate with a three-dimensional porous structure on a nanometer scale (denoted as a film electrode) for pseudocapacitor application. From cyclic voltammetry and galvanostatic discharging experiments in an organic electrolyte ( in propylene carbonate), the film electrode showed a specific Li-ion capacitance of at a potential scan rate of and a specific cap

Ruthenium oxide was electrochemically prepared onto a carbon nanotube (CNT) film substrate with a three-dimensional nanoporous structure in order to improve the specific capacitance and high-rate capability of ruthenium oxide, a promising electroactive material for supercapacitors. A very thin and uniform deposition of ruthenium oxide on the CNT film substrate was obtained by the potential cycling method. Electrochemical properties such as the specific capacitance and high-rate capability were s

Laser treatment after topical TC cream was found to be safer and more effective than the post-treatment use of topical agents.

BACKGROUND: Centrifugation helps refine autologous fat for use as an injectable filler, but the process can be injurious to fat cells. Epinephrine may be harmful to fat cells. OBJECTIVE: We studied the effects of different centrifugation levels and epinephrine dosages on fat cell viability. METHODS: Autologous fat was obtained from 8 patients who underwent lipoplasty, and the fat samples were centrifuged for 1, 3, and 5 minutes at 1500, 3000, and 5000 revolutions per minute (RPM), respectively,