Duck-young Kim

To study the mechanisms of and conditions for adipogenesis, an accurate in situ observation tool is necessary to monitor the quantity of intracellular neutral lipids in differentiating preadipocytes. Although conventional fluorescence intensity imaging is a powerful tool for observing the formation and growth of an individual lipid droplet, it suffers from photobleaching and ambiguous autofluorescence or background signals from cells. In this paper, we present a fluorescence lifetime imaging mic

This paper illustrates a power amplifier design methodology used in the millimeter-wave and analyzes design issues at millimeter-wave band. The designed millimeter-wave band power amplifier is implemented in 3 stages cascade. The power amplifier consists of a drive stage using cascode and power stage to which neutralization technique is applied. we analyze how to verify the parasitic effects in the millimeter-wave band on the cascode structure of the drive stage through pre-layout and post layou

We present a novel bandwidth measurement scheme for multimode optical fibers. Amplified spontaneous emission (ASE) radiation was utilized for a source of intrinsically modulated light with a wide modulation bandwidth. In our measurement scheme, the continuous-wave (CW) ASE light that passed through a multimode fiber (MMF) under test was analyzed by the fourth-order power with a high-speed photodetector and an electric spectrum analyzer. The modulation transfer function of the multimode fiber cou