Jae-Goo Kim

Self-fabricated permanent structure of single mode waveguide in optical fluoride glasses was demonstrated using the self-channeled plasma filament excited by a femtosecond (130fs) Ti:sapphire laser (λp=790nm). The photoinduced refractive index modification in ZrF4–BaF2–LaF3–AlF3–NaF glasses reached a length of approximately 10–15mm from the input surface of the optical glass with the diameters ranging from 5to8μm at the input intensities of more than 1.0×1012W∕cm2. The graded refractive index pr

Even though Candida albicans commonly colonizes on most mucosal surfaces including the vaginal and gastrointestinal tract, it can cause candidiasis as an opportunistic infectious fungus. The emergence of resistant Candida strains and the toxicity of anti-fungal agents have encouraged the development of new classes of potential anti-fungal agents. Sclareol, a labdane-type diterpene, showed anti-Candida activity with a minimum inhibitory concentration of 50 μg/mL in 24 h based on a microdilution a

A study on the habitat use and diet of Iksookimia hugowolfeldi, which is endemic to Korea, was carried out focusing on feeding and resting behaviour in the wild. This study focused on a valley stream in a forest on Geogeum Island (Eojeon-ri, Geumsanmyeon, Goheung-gun, Jeollanam-do, Korea) with a large population. The bottom substrate of this stream was mud (< 0.1 mm in diameter, 10 % relative abundance), sand (0.1–2 mm, 30 %), gravel (2–16 mm, 20 %), pebbles (16–64 mm, 20 %), cobbles (64–256 mm,

This paper proposes the new clamping angle control (CAC) pulse width modulation (PWM) method to restore its maximum linear modulation range of voltage source inverters (VSIs) reduced by the duty ratio limitation in hardware implementation, which makes the VSIs to operate nonlinearly in the high modulation range. The deadtime and the bootstrap gate driver circuit mainly cause this duty ratio limitation in practice. In particular, the bootstrap gate driver circuit is used in many industrial applic

The increasing epidemic of methicillin-resistant Staphylococcus aureus (MRSA), one of the most important hospital and community pathogens, has led to a demand for new agents to treat the infection. Natural products may be used to reduce this problem with low side effects. The objective of this study was to determine the antibacterial effect of fermented extracts of Angelica koreana and Arnebia euchroma by Lactobacillus spp. against S. aureus, which were tested by disk diffusion test. Extracts of

The effective removal of nano particles from silicon wafer surface was demonstrated using the self-channeled plasma filament excited by a femtosecond (130 fs) Ti:Sapphire laser (lambda <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> =790 nm). This process has achieved successfully the removal of 100 nm sized polystyrene latex (PSL) particles from the surface. The photoinduced self-channeled plasma filament in air reached a length of approxim

The optical UV absorption of human single living cells ranging from 200 nm to 350 nm was measured in situ for the study of the NIR femtosecond laser cell processing. The human breast living cells of MCF-10A, MCF-7, MDA-MB-231 were studied in this experiment.