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Point Particle Approximation for Single and Two Species Diffusion-Influenced Reactions
Kim, Hyojoon Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
The fluctuations in concentrations of reactants dominate the long-time dynamics of the single (A + A ${\rightarrow}$ 0) and two species (A + B ${\rightarrow}$ 0) diffusion-influenced annihilation reactions. Although hierarchical Smoluchowski approaches can provide a systematic and flexible framework to deal with the fluctuation effects, their results are too complicated to be analytically solved. For the efficient numerical calculation of the complicated fluctuation effect terms, we show that the presented point particle approximation is not only practical but also quite accurate for most conditions in diffusion-influenced reaction systems.
Stretchable Skin-Like Cooling/Heating Device for Artificial Thermal Sensation
Munju Kim,Jinwoo Lee,Heayoun Sul,Wonha Lee,Kyun Rok Pyun,Inho Ha,Dongkwan Kim,Hyojoon Park,Hyeonjin Eom,Yeosang Yoon,Jinwook Jung,Doungjun Lee,Seunghwan Ko 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5
Artificial reproduction of accurate/controllable thermal sensation to haptic signal is required to construct a more realistic virtual reality(VR) environment. In this study, a skin-like, highly soft and stretchable bi-functional thermo-haptic device is reported with a single device structure. The skin-like thermo-haptic(STH) device can actively cool down and heat up its deformable surface to mimic desirable thermal sensation. This new type of STH device is expected to offer potential implications to provide valuable thermal information for VR technology and medical thermal treatment.
An ethogram for the pre-reproductive stages of the green peach aphid, Myzus persicae
Yerim Lee,Hyojoon Kim,Yikweon Jang 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
The green peach aphid, Myzus persicae, is one of the most widespread insect pest worldwide. We documented all behaviors of this species during the pre-reproductive period to understand the behavioral repertoire, organization of behaviors, and the context in which they occur. The behaviors that we observed include honey-dew production, walking, wagging, and molting. Honey-dew production occurred regularly at every 30-60 min throughout all nymphal stages. Walking seemed to occur when the host condition was not good, probably related to searching for a new host. Wagging, which was the turning of abdomen with the stylet in the plant, was also frequently observed, but the function of this behavior was unclear. We also noted the frequency and the amount of time for each behavior at different nymphal stages.