• Animal Systematics, Evolution and Diversity
• /
• 제16권1호
• /
• pp.15-21
• /
• 2000

우묵날도래과의 Nothopsyche bilobata n. sp.를 신종으로 기재하였고, Apatania martima Ivanov and Levanidova의 암컷 성충과 Ecclisomyia kamtshatica(Martynov)의 유충을 한국에서 처음으로 기록하였다. 또한 3종의 미결정종(Nemotaulius sp. A. Nemotaulius sp. B. Nothopsyche sp. A)을 기록하였다.

• 지능정보연구
• /
• 제17권3호
• /
• pp.99-114
• /
• 2011

본 연구에서는 협업필터링의 두 가지 근본적인 문제인 신규고객 추천(cold-start recommendation)과 희박성(sparsity) 문제를 해결하고자 한다. 먼저, 사회 네트워크 분석에서 가장 많이 활용 되고 있는 세 가지 중심성 지표인 연결중심성(degree centrality), 근접중심성(closeness centrality), 매개중심성(betweenness centrality)을 결합한 다양한 중심성 지표들을 만든 후 이를 기반으로 신규고객의 잠재 이웃고객을 찾고 그 이웃고객들의 구매정보를 이용하여 신규고객에게 상품을 추천하는 새로운 방법을 제시한다. 다음으로 희박성 문제를 해결하기 위하여, 구매정보가 충분한 고객에게는 협업필터링을, 그렇지 않은 고객에게는 협업필터링 대신 제시한 신규고객 추천방법을 적용하는 하이브리드 추천 방법을 제안한다. 제시한 추천 방법의 효과성을 평가하기 위하여 국내 유명 백화점 중의 하나인 H백화점의 구매 트랜잭션 데이터를 사용하여 실험하였다. 실험결과로부터 근접중심성과 매개중심성을 결합한 지표를 신규고객 추천 시에 사용할 경우 추천 성능이 가장 우수한 것으로 판명되었으며, 제안한 하이브리드 추천 방법이 기존의 협업필터링의 성능을 상당히 개선함으로써 희박성 문제를 해결할 수 있는 새로운 대안임이 입증되었다.

• 환경생물
• /
• 제37권3호
• /
• pp.285-292
• /
• 2019

Acinetospora filamentosa and Microspongium stilophorae are reported as new records from South Korea based on morphological and molecular analyses. A. filamentosa is mainly characterized by having the sparsely branched erect filaments, the scattered meristematic zones, forming crampons, plurilocular sporangia on both prostrate filaments and lower part of erect filaments, and spherical to oval unilocular sporangia formed either sessile or with a pedicel. M. stilophorae is an epiphytic thalli mostly on Stilophora sp. It is characterized by prostrate filaments with irregular cells, short erect filaments with short ramuli, phaeophycean hairs, uniseriate plurilocular sporangia on the terminal part of erect filament. Our molecular analyses of rbcL and cox1 genes reveals that A. filamentosa and M. stilophorae are nested within the clades of Acinetospora and Microspongium, respectively.

• Journal of Species Research
• /
• 제5권3호
• /
• pp.300-308
• /
• 2016

Korean fauna mites in the family Parasitidae of Mesostigmata were reported as 6 genera, 22 species. Among those 20 species were recorded from Northern part of Korea by Athias-Henriot (1977; 1980), Daele (1975) and Tichomirov (1977), but two from Southern part of Korea by Choi (1994) and Korean zoological record (KSSZ, 1997). During the faunal study of soil predatory mites of diverse habitats in South Korea, four species of P. beta, P. fimetorum, P. insignis and Poecilochirus carabi are the new records to Korean peninsula. Taxonomic details and other biological characteristics are reported.

• Animal Systematics, Evolution and Diversity
• /
• 제30권1호
• /
• pp.33-38
• /
• 2014

Caeneressa diaphana muirheadi (Felder) and Caeneressa brithyris (Druce) have been recorded for the first time from India. Further, a new combination viz. Caeneressa melaena (Walker) comb. nov., has also been proposed on the basis of external genitalic features. With these records, genus Caeneressa will be represented by five species from India, Caeneressa diaphana (Kollar), Caeneressa diaphana muirheadi (Felder), Caeneressa brithyris (Druce), Caeneressa melaena (Hampson) and Caeneressa swinhoei (Leech). The studied material was collected from North-Eastern states of India. Caeneressa brithyris (Druce) was collected near riverside at low altitude whereas the other two species were collected at high altitude.

• 한국균학회지
• /
• 제49권2호
• /
• pp.155-174
• /
• 2021

Collema Weber ex F.H. Wigg is scarcely scattered throughout South Korea. However, a detailed taxonomic or revisionary study has not been carried out for almost two decades. The present study was based on specimens deposited in the lichen herbarium at Korean Lichen Research Institute, which were identified using recent literature. In this revisionary study, a total of sixteen species of Collema, including five new records, C. furfuraceum var. luzonense, C. pulchellum var. subnigrescens, C. rugosum, C. subconveniens, C. tenax, and one variety C. leptaleum var. leptaleum were documented. Further, detailed descriptions of each species and their morphological, anatomical and chemical characteristics and a key to all known Collema species of South Korea were reported.

• Journal of Species Research
• /
• 제8권1호
• /
• pp.113-115
• /
• 2019

In this study, we present new records to Korea for three ciliate species[Apogonostomum pantanalense Foissner, 2016; Keronopsis polychaeta (Borror, 1966) Jankowski, 1979; Frontonia canadensis Roque and Puytorac, 1972] collected from marine (F. canadensis) and moss-covered soil(A. pantanalense and K. polychaeta) habitats. We examined the morphology of these three ciliates based on live observations and protargol impregnation. The main characters of the three ciliates are as follows: A. pantanalense: cell size approximately $130{\times}45{\mu}m$, tail-like posterior end, and 6 or 7 ventral cirral pairs elongated to transverse cirri; K. polychaeta: size approximately $140{\times}90{\mu}m$ and approximately 18 frontal coronal cirri and 5 transverse cirri; F. canadensis: cell size approximately $100{\times}50{\mu}m$ and approximately 88 somatic kineties, 3 or 4 vestibular kineties, and 5 postoral kineties.

• Journal of Species Research
• /
• 제5권3호
• /
• pp.343-347
• /
• 2016

Two pleurostomatid ciliates, Amphileptus litonotiformis Song, 1991 and Kentrophyllum setigerum (Quennerstedt, 1867), were collected from the coastal waters of Korea. Their morphologies are described based on live observation and protargol impregnation, and their diagnoses and morphometrics are provided. Additionally, sequence information of small subunit ribosomal RNA obtained from two species were reported.

• 환경생물
• /
• 제36권3호
• /
• pp.241-251
• /
• 2018

To find unrecorded diatom species, random materials were collected from the freshwater, brackish water, and coastal waters. Benthic and periphytic diatoms were sampled from twelve localities. Thirteen species belonging to eight genera are newly added to the national flora of diatom. In the intertidal areas, the five species are new to Korea, Anaulus minutus Grunow, Anaulus simonsenii Witkowski & Metzeltin, Eunotogramma laeve Grunow, Eunotogramma productum Grunow, and Nitzschia subcapitellata Hustedt. The following two species are new from brackish waters, Chamaepinnularia krookiformis (Krammer) Lange-Bertalot & Krammer and Cymatoneis ovalis Heiden. The following four species are new from mountain peatlands, Geissleria ignota (Krasske) Lange-Bertlaot & Metzeltin, Chamaepinnularia hassiaca (Krasske) Cantonati & Lange-Bertalot, Chamaepinnularia mediocris (Krasske) Lange-Bertalot and Pinnularia linearidivergens Kulikovskiy, Lange-Bertalot & Metzeltin. The following two species are new from river or streams, Cymbella hustedtii var. compacta Krammer and Cymbella stigmaphora ${\emptyset}strup$.

• 환경생물
• /
• 제21권2호
• /
• pp.126-131
• /
• 2003

Thirty three species in six subfamilies of Staphylinidae are recognized from Ulleung-do through the survey in 2001. Among them, Thirty one species are newly reported from Ulleung-do. Two species, Anotylus lewisius(Sharp) and Megarthrus aino Cuccodoro, are reported for the first time from Korea.