• Journal of Korean society of Dental Hygiene
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• v.20 no.5
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• pp.763-771
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• 2020

Objectives: Erigeron bonariensis is a type of Erigeron found throughout the tropical and subtropical areas as one of the perennial plants or pioneer plants. It is known to show detoxifying, antipyretic, and anticancer effects for various cancers. However, there are no reports on the anticancer effect of E. bonariensis on oral cancer cells. In the present study, we investigated the effects of the methanol extract of Erigeron bonariensis (MEEB) on the inhibition of cell growth and induction of apoptosis in mucoepidermoid carcinoma (MEC) cell lines, including the MC3 and YD15 oral cancer cells. Methods: MC3 Cells were treated by dimethyl sulfoxide (DMSO) or methanol extracts of 20 various natural products 20 ㎍/mL for 48 hours and cell viability were analyzed as Trypan blue exclusion assay. The effects of MEEB treatment on the cell viability of MC3 and YD15 cells, for 48 h, were analyzed by Trypan blue exclusion assay. The anticancer efficacy and apoptosis of oral cancer cell lines were analyzed by western blot analysis. The statistical significance of differences between groups was analyzed by Student's two-tailed t-test. A value of P<0.05 compared to the vehicle control was considered statistically significant. Results: Among 20 different naturally derived products, MEEB significantly inhibited cell viability and increased cleaved poly [ADP-ribose] polymerase 1 (PARP) protein in the MC3 and YD15 cells in a concentration-dependent manner. Conclusions: These results suggest that MEEB can be used as a natural anticancer drug for the treatment of human oral cancer.

• Korean Journal of Weed Science
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• v.8 no.3
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• pp.291-294
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• 1988

About 136 weed species belonging to 44 families occurring in summer observed in Cheju island. The Compositae was the most widely occurring family covering 29 weed species, followed by 16 species in Graminae, 14 in Leguminosae, 13 in Rosaceae, 10 in Polygonaceae etc., The dominant weed species detected in range areas of Cheju island were Trifolium repens, Botrychium virginianum, Rosa multiflora, Miscanthus sinensis, Imperata cylindrica. The range areas of Cheju island consisted of the communities of Artemisia princeps-Botrychium virginianum, Artemisia princeps-Erigeron borariensis and Dianthus sinensis, and Artemisia-Lespedeza bicolor and Miscanthus sinensis and then the differential species of their communities were Botrychium virginianum, Erigeron boriensis, and Lespedeza bicolor and Miscanthus sinensis, respectively. The species of the high frequencies occurring in investigated sites were Artemisia princeps, Cirsium rhinoceros, Hydrocotyle ramijlora, Rosa multiflora, Sanguisorba officinalis, Rubus crataegifolius, Potentilla fragariodes, Erigeron annus, Plantago asiatica, Oxalis corniculata, Mosla dianthera in order.

• Korean journal of applied entomology
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• v.33 no.1
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• pp.1-5
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• 1994

These studies were to observe the pentatomid species of chrysanthemum, and to investigate the h host range of Nysius plebejus DIstant and its control The five pentatomid species of four families w were observed In Chinju and Masan areas. Dominant species was Nysius plebejus DIstant with 80.6% occufied. The host plants of N. plebejus were 20 species in chrysanthemum fields. And major hosts were chrysanthemum morifalium, Lolium multiflorum, Erigeron linifolius and Fragana chiloensls. All the cultivars of C. monfoIium were infested and severely damaged by N. plebeius Appropnate control of N. plebejus was 3~4 applications of the effective insecticides at 10-day intervals from early August.

• Journal of Climate Change Research
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• v.6 no.3
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• pp.243-248
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• 2015

This study was conducted to predict the changes of potential distribution for invasive alien plant, Conyza bonariensis in Korea. C. bonariensis was found in southern Korea (Jeju, south coast, southwest coast). The habitats of C. bonariensis were roadside, bare ground, farm area, and pasture, where the interference by human was severe. Due to the seed characteristics of Compositae, C. bonariensis take long scattering distance and it will easily spread by movement of wind, vehicles and people. C. canadensis in same Conyza genus has already spread on a national scale and it is difficult to manage. We used maximum entropy modeling (MaxEnt) for analyzing the environmental influences on C. bonariensis distribution and projecting on two different RCP scenarios, RCP 4.5 and RCP 8.5. The results of our study indicated annual mean temperature, elevation and temperature seasonality had higher contribution for C. bonariensis potential distribution. Area under curve (AUC) values of the model was 0.9. Under future climate scenario, the constructed model predicted that potential distribution of C. bonariensis will be increased by 338% on RCP 4.5 and 769% on RCP 8.5 in 2100s.

• Korean Journal of Plant Resources
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• v.23 no.2
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• pp.187-196
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• 2010

A total of 10 islands (Kumodo and Komundo in Yeosu City; Oinarodo in Goheung County; Chongsando, Soando, and Pogildo in Wando County; Chodo in Jindo County; Uido, Huksando, and Hongdo in Shinan County) were surveyed to confirm distribution of naturalized plants from June 2006 to December 2008. A total of 100 naturalized plants taxa from 25 families were recorded. The highest number of naturalized plant species (82 taxa) was recorded on Oinarodo, while the lowest number was recorded on Hongdo (42 taxa) and on Uido (34 taxa). A total of 26 naturalized species taxa (such as Dactylis glomerata, Lolium perenne, Bromus unioloides, Rumex obtusifolius, Chenopodium album, Phytolacca americana, Barbarea vulgaris, Lepidium apetalum, Robinia pseudo-acacia, Trifolium repens, Erigeron annuus, Erigeron canadensis, Senecio vulgaris, Xanthium strumarium) was recorded in all study areas. Distribution of naturalized plants were categorized into 7 habitat types based on ecological traits: afforested land, beach, port, and vacant land, road boundary, road cut and slope area, waste arable land, landfill area, and wetland. Systematic management is required to conserve unique landscape, species diversity, vegetation and ecosystem of Dadohae National Park. In order to manage the naturalized plants in Dadohae National Park, basic surveys are most needed to understand distribution and dispersal of naturalized plants communities based on ecological features of each habitat type.

• Korean Journal of Environment and Ecology
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• v.17 no.2
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• pp.123-132
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• 2003

This ecological study investigated the vegetation changes of abandoned salt field, 21 plots(1${\times}$lm, 1${\times}$2m) set up by the methods of Braun-Blanquet and Elenberg in a coastal island, Gasado, Jindogun, from July to September,2002. The vascular plants of abandoned salt field in the surveyed site identified 17 families and 48 species. Of these species, halophytes and mesophytes were 20(42%) and 28(58%) species. In addition, the disturbance to this habitat led to the change of halophytes in abandoned sald field, exotic plants was distributed 23 species, which included Dactylis glomerata, Conyza canadensis, Oenothera odorata, Cosmos bipinnatus, etc., in the group of, mesophytes were 20(71%) species, vegetation communities were classified into 3 community types, i.e. the halophyte grassland community(Limonium tetragonum community, Suaeda japonica community, Spergularia marina community), the wetland grassland community(Phragmites communis community, Carex scabrifolia community, Phaceturus latifolius var. angustifolius community), and the mesophyte grassland community(Erigeron bonariensis community, Daucus littoralis var. koreana community). Each communities was described the structual, distribution and changes of the vegetation in the abandoned salt field, the vegetation table and actual vegetation map were prepared.

• Journal of Digital Convergence
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• v.18 no.2
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• pp.277-284
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• 2020

Text mining is a representative method of big data analysis that extracts meaningful information from unstructured and large amounts of text data. Social media such as Twitter generates hundreds of thousands of data per second and acts as a one-person media that instantly and directly expresses public opinions and ideas. The traditional media are delivering informations, criticizing society, and forming public opinions. For this, we compare the responses of SNS with the responses of media on the issue of the termination of the Korea-Japan GSOMIA (General Security of Military Information Agreement), one of the domestic issues in the second half of 2019. Data collected from 201,728 tweets and 20,698 newspaper articles were analyzed by sentiment analysis, association keyword analysis, and cluster analysis. As a result, SNS tends to respond positively to this issue, and the media tends to react negatively. In association keyword analysis, SNS shows positive views on domestic issues such as "destruction, decision, we," while the media shows negative views on external issues such as "disappointment, regret, concern". SNS is faster and more powerful than media when studying or creating social trends and opinions, rather than the function of information delivery. This can complement the role of the media that reflects public perception.

• Journal of Korean Classical Literature and Education
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• no.33
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• pp.121-152
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• 2016

The purpose of this study is to illustrate the history of the Cheonsu-Temple天壽寺 and to describe the echo verse poem trend with regard to 'Waiting'待人 and why it is beautiful. The Cheonsu-Temple was located in the outskirts of Gaesung開城, the capital city during the Corea高麗 Dynasty. However, the temple was destroyed when the dynasty collapsed. Cheonsu-Station天壽院 was built amidst the temple ruins, as the temple was an important traffic point. The Cheonsu-Pavilion天水亭 was built in 1476 by Yi-Ye李芮 in the station's neighborhood. The station and the pavilion were completely ruined during the 17th century. Many poets visited the Cheonsu-Temple and composed poems in the latter part of the Corea Dynasty. 'Waiting'待人, written by Choi-Sarip崔斯立, -is the most famous work. Following this work, many poets composed echo verse poems 'Waiting' work that represented the anxiety of waiting for an old friend in front of the Cheonsu-Temple. The following is a highlighted verse: So many people who look like the old friend come to me, but it turned out no one was the man. This work is very picturesque. Over twenty echo verse poems 'Waiting' are categorized in three periods. They compared the "present" to the past by using the Zhenglingwei丁令威 origin from the former Joseon朝鮮 period. In the middle of Joseon period, Jungjong中宗 visited Cheonsu-Station and composed an echo verse poem 'Waiting'. The official literaries also composed poems there. In their works, they presented the collapse of the Corea Dynasty as inevitable and the construction of Joseon Dynasty as something reasonable. Cheonsu-Station was ruined in 17th century, followed after by the ruin of the Cheonsu-Pavilion. It appears that the echo verse poems to 'Waiting' in the latter Joseon period represented the ruin of the Cheonsu-Temple, the Cheonsu-Station, and the Cheonsu-Pavilion.