Ki-Young Park

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In this paper we describe the properties of independent components of optical ow of moving objects. Video sequences of objects seen by an observer moving at various angles, directions and distances are used to produce optical ow maps. These maps are then processed using independent component analysis, which yields l-ters that resemble the receptive elds of(More)
Based on a psychological selective attention theory a new algorithm is developed to provide reliable out-of-vocabulary (OOV) rejection for speech recognition systems in noisy environments. The developed attention model is based on Broadbent's " early filtering " theory, and the attention adaptation process utilizes a gradient-descent error minimization(More)
Keratinocyte stem/progenitor cells (KSCs) reside in the bulge region of the hair follicles and may be involved in hair growth. Hair follicle dermal papilla cells (HFDPCs) and outer root sheath (ORS) cells were treated with conditioned medium (CM) of KSCs. Moreover, the effects of KSC-CM on hair growth were examined ex vivo and in vivo. A human growth factor(More)
The human-type ATP:corrinoid adenosyltransferase PduO from Lactobacillus reuteri (LrPduO) catalyzes the adenosylation of Co(II)rrinoids to generate adenosylcobalamin (AdoCbl) or adenosylcobinamide (AdoCbi+). This process requires the formation of “supernucleophilic” Co(I)rrinoid intermediates in the enzyme active site which are properly positioned to(More)
Binuclear non-heme iron enzymes activate O2 to perform diverse chemistries. Three different structural mechanisms of O2 binding to a coupled binuclear iron site have been identified utilizing variable-temperature, variable-field magnetic circular dichroism spectroscopy (VTVH MCD). For the μ-OH-bridged Fe(II)2 site in hemerythrin, O2 binds terminally to a(More)
Supplementary Figure 1 | X-ray crystallographic structures of SyrB2 resting Fe II active site (substrate-free) coordinated with αKG and Cl – /Br – (taken from ref. 23, main text). a, Overlaid structures of Fe II active sites from both monomeric units (Chains A and B) of SyrB2–Cl (top) and SyrB2–Br (bottom). b, Overlaid structures of Chain B of SyrB2–Cl and(More)
Purpose Research on tele-operated excavators that protect the operator from the risk of tip-over excavators in hazardous working areas has increased in popularity. The tele-operated excavator is able to protect workers from risks in hazardous working areas, but the operator cannot directly access the tip-over information from the tele-operated excavator. We(More)
Based on biological selective attention mechanism, a new algorithm was developed to improve recognition accuracy of isolated speeches in noisy environments. The attenuating " early filtering " model was implemented by inserting an attention layer just after the input layer. Attention gains, i.e., one-to-one synaptic weights between the original sensor input(More)
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