• Korean Journal of Plant Taxonomy
• /
• v.34 no.1
• /
• pp.27-35
• /
• 2004

Three unrecorded fern species from the flora of Korea belonging to family Dryopteridaceae, Ctenitis maximowicziana, Dryopteris lunanensis, and D. dcipiens var. diplazioides, are found along the valley of Mt. Wolgak (alt. 275m) in Gwangju, Korea. C. maximawicziana is well distinguished from the rest of the species in the genus including C. sinii by the color and morphology of scales in basal part of petioles, shape of blades, and the presence of round-reniform shaped indusia. Dryopteris lunanensis is also well distinguished from its close relative, D. atrata, by the number of lateral pinnae, degree of division of first and/or second pinnules in lower pinnae of the blades, and distribution pattern of sori. Dryapteris decipiens var. diplazioides is distinguishable from type variety by degree of division in lower pinnae of the blades. In terms of morphology, var. diplazioides seems to be intermediate between a type variety and D. fuscipes.

• Korean Journal of Plant Taxonomy
• /
• v.32 no.4
• /
• pp.481-489
• /
• 2002

Unrecorded fern species of Korean flora, Thelypteris interrupta (Willd.) K. Iwats. (Thelypteridaceae) and Dryopteris subexaltata (H. Christ) C. Chr. (Dryopteridaceae), were collected from Jeju island off the south coast of Korean peninsula and reported here. T. interrupta is most similar to T. acuminata (Houtt.) C. V. Morton in morphology, however, the two species are readily distinguishable by the plant color including rhizome, stipe base and spore, and the presence of glandular hair as well as the distribution pattern of sorus on lower leaf surface. D. subexaltata is also well distinguishable from its relatives, D. sparsa (D. Don) Kuntze, D. sabaei (Franch. & Sav.) C. Chr., and D. yakusilvicola Sa. Kurata by the presence of proliferation, shape of pinnae, distribution pattern of sori on lower leaf surface, and shape of indusium.

• Korean Journal of Plant Taxonomy
• /
• v.43 no.3
• /
• pp.171-180
• /
• 2013

Two newly recorded species, Cyrtomium laetevirens and Dryopteris simasakii var. paleacea (Dryopteridaceae) were collected from forests in Jeonnam, Geongnam and Jeju-do, with the latter also, found addedly in Gwanaksan, Seoul. C. laetevirens (vernacular name: 'Yun-soe-go-bi) was distinguished from other Korean congeners of the genus Cyrtomium by having glossy laminae, narrow lanceolate, yellow-green pinnae with minutely serrated margin and gradually narrowing shape from base to apex, along with entire, unicolor, and white grayish indusia. D. simasakii var. paleacea (vernacular name: Cheung-cheung-ji-ne-go-sa-ri'), was distinguished by shining leaves, opposite pinnae arrangement, no falcate pinnules, and densely adpressed scaly wholly along with irregular dark brown scales on stipe and rachis. Descriptions and illustrations of the two taxa and their photographs in the habitat are provided along with a key to the species of Cyrtomium and sect. Hirpedes of Dryopteris from Korea.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2010.10a
• /
• pp.16-16
• /
• 2010

본 연구는 13과 37종 양치식물의 엽상체(지상부)와 근경의 메탄올 추출물을 대상으로 식품의 오염 및 변질의 원인이 되는 Bacillus subtils, 식중독의 원인이 되는 Escherichia coli, 식중독 및 선회병(listeriosis)의 원인이 되는 Listeria monocytogenes, 피부 여드름의 원인이 되는 Propionibacterium acnes에 대한 항균활성을 탐색하고 항균력이 우수한 천연소재를 선발하기 위하여 시행하였다. $5mg{\cdot}mL^{-1}$의 농도의 추출물을 대상으로 각 미생물에 대하여 50% 이상의 항균활성을 나타낸 양치식물 추출물을 선발하였으며, 선발된 추출물을 2mg/disc의 농도로 조절하여 agar diffusion법으로 항균력을 측정하여 15mm 이상의 억제환을 나타내는 추출물을 선발하였다. 상기의 방법으로 선발된 추출물을 $0.125{\sim}2.000mg{\cdot}mL^{-1}$의 농도로 조절하여 72시간 동안 각 미생육의 생육에 미치는 영향을 분석하여 항균활성이 우수한 양치식물의 추출물을 선발하였다. 연구의 결과, B. subtils의 생육억제에는 야산고비의 성엽과 쇠고비의 근경 추출물, E. coli의 생육 억제에는 설설고사리의 성엽과 나도히초미 및 더부살이고사리의 근경 추출물, L. monocytogenes의 생육억제에는 관중의 성엽과 공작고사리, 꿩고비 및 쇠고비의 추출물이 효과적이었다. 한편 대부분의 양치식물 추출물은 P. acnes의 생육억제 효과가 미비하였으나, 관중과 참지네고사리는 성엽과 근경 모두에서 P. acnes의 생육억제 효과가 매우 우수하였으며, 별도의 제균처리를 하지 않은 관중과 참지네고사리의 메탄올 조추출물의 $MIC_{50}$은 성엽의 추출물에서 66.8과 $80.4{\mu}g{\cdot}mL^{-1}$, 근경의 추출물에서는 8.8과 $54.2{\mu}g{\cdot}mL^{-1}$로 나타났다.

• Korean Journal of Plant Taxonomy
• /
• v.45 no.2
• /
• pp.114-135
• /
• 2015

The taxa of Dryopteris subg. Erythrovariae are variable in morphology, resulting in taxonomic confusion in delimiting taxon boundaries. We examined the morphological characteristics of the Korean members of subg. Erythrovariae to clarify their taxonomic identities and relationships. The shapes of the blades, pinnae, and pinnule apices, the shapes and colors of the scales, and the positions of sori were useful for delimiting the Korean taxa of the subgenus. Based on the results of this study and evidence from previous studies, 13 taxa comprising 12 species and one variety of Dryopteris subg. Erythrovariae were recognized in Korea. Descriptions of all Korean taxa of the subg. Erythrovariae and a key to the species are provided. The descriptions presented here are based on field observations and the examination of some 1,000 specimens from the major herbaria of the world.

• KIPS Transactions on Software and Data Engineering
• /
• v.6 no.12
• /
• pp.565-572
• /
• 2017

Traditional method for time series analysis, autoregressive integrated moving average (ARIMA) allows to mine significant patterns from the past observations using autocorrelation and to forecast future sequences. However, Korean baseball games do not have regular intervals to analyze relationship among the past attendance observations. To address this issue, we propose artificial neural network (ANN) based attendance prediction model using various measures including performance, team characteristics and social influences. We optimized ANNs using grid search to construct optimal model for regression problem. The evaluation shows that the optimal and ensemble model outperform the baseline model, linear regression model.

• Proceedings of the Acoustical Society of Korea Conference
• /
• spring
• /
• pp.495-500
• /
• 2002

전주월드컵 경기장은 Fully Digital sidelobe-free array 방식의 음향시스템을 도입한 유일한 경기장으로서 대규모 경기장에 Line Array type의 스피커를 사용한 최초의 예가 된다. 현장음향실험을 통하여 경기장의 주요 음향 파라미터인 음압레벨(SPL), 잔향시간(RT), 음성명료도(D50), 음성이해도(RASTI) 등을 측정함으로 전주월드컵 경기장의 음향시스템의 특성과 종합적인 음향성능을 알아보고자 한다. 주음원(Messenger)만 사용하여 실험한 결과 음압레벨(SPL)은 관중석의 객석간 위치별 음압레벨 표준편차가 약 2.78dB로 나타났다. 이 값은 당초의 음압레벨분포편차의 목표치인 ${\pm}3dB$의 범위 이내로 나타났다. 또한 최대음압레벨은 평균 100.1dB로 목표치인 96dB을 초과하는 것으로 나타났다. 잔향시간(RT)은 공석시 전체 관중석 평균 2.94초로 나타났으며, 1000Hz에서의 평균 잔향시간은 2.58초로 나타났다. 잔향시간은 실제 경기장의 사용 시 약 0.3-0.4초의 감소가 발생되리라 판단된다. 음성명료도(D50)는 전체 관중석 평균 $56.2\%$로 매우 양호한 상태로 나타났고 음성이해도(RASTI)는 전체 관중석 평균 0.63으로 목표치인 0.5를 상회하는 것으로 나타났다. 이상의 현장음향실험 결과를 분석한 결과 전주월드컵 경기장의 음향성공은 음향설계 요건을 만족하는 것으로 나타났고 야외 경기장 같은 대형공간에서의 음향시스템에 있어서 Fully Digital sidelobe-free array 방식의 음향시스템의 적용가능성을 보여주고 있는 것으로 나타났다.

• Journal of the Korean Data and Information Science Society
• /
• v.25 no.6
• /
• pp.1481-1489
• /
• 2014

For predicting yearly total attendances in Korean probaseball games, ARIMA models have been widely adopted so far. In this paper, we discuss two other ways of ARIMAX and growth curves with an exogenous variable to predict the attendances. By using the exogenous variable, it turns out that the prediction has been improved compared to ARIMA. It is concluded that various statistical methods must be considered for better prediction, and its results can be applied to predict the attendances of other pro sports.

• Korean Journal of Plant Resources
• /
• v.25 no.2
• /
• pp.176-183
• /
• 2012

This study was carried out to develop ferns as the natural antioxidant materials by graduating and extracting fronds of $Dryopteris$ $crassirhizoma$, $Dryopteris$ $nipponensis$, and $Polystichum$ $lepidocaulon$, which belong to Dryopteridaceae, using solvent, and analyzing the antioxidant effect of each fraction. The n-butanol fraction of $D.$ $crassirhizoma$ (550.0 $mg{\cdot}g^{-1}$), the ethyl acetate fraction of $D.$ $nipponensis$ (374.8 $mg{\cdot}g^{-1}$), and the n-butanol fraction of $P.$ $lepidocaulon$ (781.8 $mg{\cdot}g^{-1}$) showed relatively higher total contents of polyphenol. The chloroform fraction of $D.$ $crassirhizoma$ (72.9 $mg{\cdot}g^{-1}$), and the n-hexane fraction of $D.$ $nipponensis$ (72.9 $mg{\cdot}g^{-1}$) and $P.$ $lepidocaulon$ (154.5 $mg{\cdot}g^{-1}$) contained relatively higher total contents of flavonoids. DPPH radical scavenging activity was most excellent in the n-butanol fraction of $D.$ $crassirhizoma$ ($RC_{50}=0.02mg{\cdot}mL^{-1}$) and $P.$ $lepidocaulon$ ($RC_{50}=0.04mg{\cdot}mL^{-1}$), and the water fractions of $D.$ $nipponensis$ ($RC_{50}=0.01mg{\cdot}mL^{-1}$). ABTS radical scavenging activity was potent in the n-hexane and n-butanol fractions of $D.$ $crassirhizoma$ (each $RC_{50}=0.02mg{\cdot}mL^{-1}$), the ethyl acetate fraction of $D.$ $nipponensis$ ($RC_{50}=0.03mg{\cdot}mL^{-1}$), and the n-butanol fraction of $P.$ $lepidocaulon$ ($RC_{50}=0.06mg{\cdot}mL^{-1}$). There was the large amount of total polyphenol content in the n-butanol fraction of $D.$ $crassirhizoma$ and $P.$ $lepidocaulon$, and their radical scavenging activities were potent. Therefore, it was thought that biologically active substances of each fraction layer are required to be analyzed and used.

• Journal of the Society of Cosmetic Scientists of Korea
• /
• v.32 no.3 s.58
• /
• pp.201-208
• /
• 2006

Propionibacterium acnes have been recognized as pus-forming bacteria triggering an inflammation in acne. The present study was conducted to evaluate antimicrobial activities of Dryopteris crassirhizoma Nakai against these etiologic agents of acne vulgaris and application possibility as a cosmetic resource. D. crassirhizoma crude extract and hexane fraction was prepared and its anti-acne effect against Propionibacterium acnes was investigated with minimum inhibitory concentration (MIC) and paper disk diffusion method. The MIC of D. crassirhizoma crude extract and hexane fraction was 0.008 mg/mL and 0.001 mg/mL, respectively. This implies that D. crassirhizoma extract may be an efficient anti-acne ingredient for cosmetics, as a crude extract. The paper disk diffusion assay showed that its anti-acne effect was similar to that of triclosan. The cytotoxic effect of D. crassirhizoma extract was determined by a colorimetric MTT assay using HaCaT cell line and D. crassirhizoma extract exhibited lower cytotoxic effects. Finally, we examine the stability of D. crassirhizoma extract to temperature and pH. The D. crassirhizoma extract was very stable to high temperatures ($25{\sim}121^{\circ}C$) and to wide pH range ($pH\; 2{\sim}11$), suggesting its utilization for cosmetics.