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강신길,성찬경,정지웅,박동호,이종현,이창훈 한국패류학회 2016 The Korean Journal of Malacology Vol.32 No.1
This study was carried out to determine the optimal water temperature for the embryonic development and laboratory culture of larvae of an intertidal mud snail, Nassarius festivus. The embryos and hatched veliger larvae of N. festivus were incubated at six different temperatures (5, 10, 15, 20, 25 and 30℃). Developmental time for each stage decreased as water temperature increased. The elapsed time to develop to the veliger larva at 15, 20, 25 and 30℃ was 559, 155, 131 and 103 hrs, respectively. At 5 and 10℃, embryo developed to veliger larvae but failed to hatch out of the egg capsule. In contrast, all embryos successfully hatched in the temperature range from 15 to 30℃. The biological minimum temperature during the embryonic development of N. festivus was estimated to be 9.5 ± 0.4℃. The cumulative water temperatures for blastula, gastrula and veliger stages were calculated as 111 ± 84, 486 ± 185, 1,164 ± 72℃, respectively. Temperature also affected the larval survival. Five days after hatching, more than 84% of larvae survived at all experimental temperatures. However, survival began to decrease after 6 days. It was 0% at 30℃. Survival of larvae incubated for 8 days was higher at 15 and 20℃ than other experimental temperatures. We therefore suggest that the optimal range of temperature for embryonic development and larval survival of N. festivus is 15-20℃.
강신길,윤용산,박재희,Gang, Sin-Gil,Yun, Yong-San,Park, Jae-Hui 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.7
When markers attached to body segment are captured by camera, they generally have many noises due to intrinsic biomechanical characteristics. In this study, one technique to reduce these noises is suggested, which constructs a local coordinates of the markers using time-mean lengths of the measured markers and calculates a linear transformation matrix of the interesting body using least square error technique. This matrix is decomposed into two matrices of rotation and flexibility. Suggested method does well for 3 markers or more, and shows consistent results without regard to choice of reference axis.