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Hideaki Kawano,Akito Shimamura,Hiroshi Maeda,Junichi Fukuyo,Norikazu Ikoma 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For recognition of decorated characters through existing optical character recognition system (OCR), structure extraction of the decorated characters is required. Omachi et al. proposed a structure extraction method for these characters. However, characters including both thin lines and thick lines simultaneously tend to fail the extraction of structure. To overcome the performance in Omachi’s method, we have proposed another method based on graph spectral decomposition. In the previous work, we showed applicability of the proposed method to wider range of decorated characters. However, selection criterion among decomposed components for obtaining good results have not been clarified. In this paper, we propose a new criterion to select components in the graph spectral decomposition framework for structure extraction. Experimental results show the validity of the criterion.
Kim, Keun-Yong,Matoko Yoshida,Yasuwo Fukuyo,Kim, Chang-Hoon The Korean Society of Phycology 2002 ALGAE Vol.17 No.1
Twenty-nine culture strains belonging to the genus Alexandrium Halim (Dinophyceae) were established from water column or sediments in Korea. Seventeen isolates were identified as A. tamarense (Lebour) Balech, eight isolates as A. sp. cf. catenella and one as A. catenella (Whedon et Kofoid) Balech according to the presence or absence of a ventral pore, the shape of the posterior sulcal plate and the sulcal width. Three isolates were unable to be identified due to considerable distortion of thecal plates and lack of enough materials, but typical of A. tamarense and/or A. catenella. The overall cell shape of A. tamarense was usually longer than wide. The posterior sulcal plate was definitely longer than wide dorsoventrally, and sulcus extended posteriorly without apparent widening. They were distributed in three major coasts of Korea. In contrast, the cell shape of A. sp.cf. catenella was generally anterior-posteriorly flattened. The transversal axis of the posterior sulcal plate was always longer than the longitudinal, or both axes were nearly equal in length. Its sulcus was broader than that of A. tamarense and widened in the direction of antapex about 1.5 times. This morphotype existed in nearshore and offshore waters of the southern Korea sea. One of A. catenella isolates from Jinhae Bay showed no conspicuous differences with A. sp. cf. catenella except for the consistent absence of a ventral pore.
( Jong Su Yoo ),( Jin Hwan Lee ),( Yasuwo Fukuyo ) 한국식물학회 2004 Journal of Plant Biology Vol.47 No.2
The Prorocentrum species, which are primarily marine, are distributed worldwide and occur in ocean, neritic, and littoral environments. Prorocentrum is either a planktonic or benthic genus, with some species possibly being both. Until now, about 35 species had been reported including two that are fresh-water. Some species contain toxic substances. As one of many currently active studies, we collected P. vietnamensis sp. nov. from Hon Me, Gulf of Tongkin, Vietnam. Based on its cell shape, smooth valve surface, arrangement of valves and marginal pores, plus characteristics of the central pyrenoid, we propose that P. vietnamensis is a new species. Its attributes include straight cell sides that are parallel to each other, as well as anterior and posterior areas with rounded ends that form a short, rod-shaped cell that is unique to this species.
Toxic Algal Bloom Caused by Dinoflagellate Alexandrium tamarense in Chindong Bay , Korea
KIM, Hak Gyoon,LEE, Sam Geun,Yoo, Jong Su,Fukuyo, Yasuwo,Cheun, Byeung Soo 한국수산학회 2000 Fisheries and Aquatic Sciences Vol.3 No.1
Monospecific red tide by a toxic dinoflagellate belonging to the genus Alexandrium occurred at Chindong Bay in the southern coast of Korea and continued from April 6th to 15th in 1997. The ratio of its cell number to total phytoplankton cell number was much higher than 95%. This organism was identified as Alexandrium tamarense, although slight morphological differences were found comparing to the original and successive descriptions of the species. We found neither anterior nor posterior attachment pores in these cells of the bloom population. The occurrence of red tide caused by A. tamarense was first reported in Korea. Its plate formula is Po, Pc, 4', 6$quot;c, 8s, 5$quot;'and 2$quot;$quot;. Thecal plates are thin with pore-like ornamentation. In those plates, the anterior part of the first apical plate (1') is narrower and its posterior end has sometimes a block-like accessory, but this variation was considered within the range of the morphological variability of this taxon. The cell density during the red tide exhibited a wide range of variation by the depth of water column, ranging from 2×10^6 cells·ℓ^(-1) to 5×10^6 cells·ℓ^(-1). Water temperature varied from 11.8 to 12.3 ℃. Toxicity of A. tamarense during red tide was measured as 8.8×10^5 MU·cell^(-1) by mouse bioassay.