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Articles by D. W Kang
Total Records ( 2 ) for D. W Kang
  J. S Choi , H. S Kim , K. R Mun , D. W Kang , M. S Kang , Y. H Bang , H. S Oh , J. H Yi , Y. T Lim and G. R. Tack

Putting is a crucial stroke to determine winning in golf. Putting is more delicate than any other strokes in golf. To keep better putting stroke, psychological factors as well as physical factors are important for golfers. The purpose of this study was to compare differences in kinematic and psychological variables between winner and loser of three skilled levels during competitive golf putting tournament. The participants consisted of 3 groups based on their skill levels: PG (8 professional golfers), RG (8 recreational golfers) and NG (8 novice golfers). Each group performed 8 tournaments by attempting 2.1 m putting from the hole. 3D motion analysis system with 6 high speed cameras and BIOPAC ECG module were used to acquire kinematic data and ECG. To compare differences between winner and loser for each group, time phase of putting stroke, smoothness by jerk cost function (JC), heart rate (HR), ratio of low and high frequency component (LF/HF) in heart rate variability and CSAI-2 scores (competitive state anxiety inventory 2) were used. There was a significant difference in back-swing phase time ratio between PG and other groups and in JC at the putter toe between NG and other groups. There was a significant difference in LF/HF and self-confidence score of CSAI-2 between winner and loser within PG. While PG and RG showed similar kinematic performance, they showed different LF/HF. The tonic states derived from cardiac activity indicated that a higher skilled level was associated with increased LF. Increased LF is associated with increased automaticity and decreased attention demands, which means that increased mental workload reduces LF. For PG, it may reveal that psychological factor is one of the important factors for the better performance during competition. Further studies are necessary to clarify psychological factors of putting by using different measurement techniques such as galvanic skin response.

  H Kubagawa , S Oka , Y Kubagawa , I Torii , E Takayama , D. W Kang , G. L Gartland , L. F Bertoli , H Mori , H Takatsu , T Kitamura , H Ohno and J. Y. Wang

Although Fc receptors (FcRs) for switched immunoglobulin (Ig) isotypes have been extensively characterized, FcR for IgM (FcµR) has defied identification. By retroviral expression and functional cloning, we have identified a complementary DNA (cDNA) encoding a bona fide FcµR in human B-lineage cDNA libraries. FcµR is defined as a transmembrane sialoglycoprotein of ~60 kD, which contains an extracellular Ig-like domain homologous to two other IgM-binding receptors (polymeric Ig receptor and Fc/µR) but exhibits an exclusive Fcµ-binding specificity. The cytoplasmic tail of FcµR contains conserved Ser and Tyr residues, but none of the Tyr residues match the immunoreceptor tyrosine-based activation, inhibitory, or switch motifs. Unlike other FcRs, the major cell types expressing FcµR are adaptive immune cells, including B and T lymphocytes. After antigen-receptor ligation or phorbol myristate acetate stimulation, FcµR expression was up-regulated on B cells but was down-modulated on T cells, suggesting differential regulation of FcµR expression during B and T cell activation. Although this receptor was initially designated as Fas apoptotic inhibitory molecule 3, or TOSO, our results indicate that FcµR per se has no inhibitory activity in Fas-mediated apoptosis and that such inhibition is only achieved when anti-Fas antibody of an IgM but not IgG isotype is used for inducing apoptosis.

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