• ALGAE
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• v.22 no.3
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• pp.201-207
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• 2007

For getting primary cue of restoration, the algal flora and intertidal community structure of Deokjeokdo, Yeonpyeongdo and Ganghwado were investigated for from February to November 2006. The total of 28 species, including five Chlorophytes, five Phaeophytes, 17 Rhodophytes and one sea grass were identified. The occurrence of species according to sampling site was 22 species in Deokjeokdo, seven species in Yeonpyeongdo and four species in Ganghwado. Among them Gloiopeltis furcata, Ulva pertusa and Sargassum horneri in Deokjeokdo, Scytosiphon lomentaria in Yeonpyeongdo, Enteromorpha prolifera in Ganghwado were ominants. The algal zonation of intertidal zone was figured out by Gloiopeltis furcata, Caulacanthus okamurae – Corallina pilulifera – Ulva pertusa, Ahnfeltiopsis flabelliformis, Sargassum horneri, Undaria pinnatifida in Deokjeokdo, Bangia atropurpurea – Scytosiphon lomentaria – Ahnfeltiopsis flablleiformis in Yeonpyeongdo from upper to lower zone and Enteromorpha prolifera, Enteromorpha linza – Sargassum thunbergii, Myelophycus simplex in Ganghwado from middle to lower zone. The average of biomass was measured as 80.6 g dry wt. m–2 in Deokjeokdo, 32.2 g dry wt. m–2 in Yeonpyeongdo and less than 1 g dry wt. m–2 in Ganghwado.

• Korean Journal of Plant Resources
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• v.28 no.4
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• pp.487-510
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• 2015

This study was carried out to inventory the vascular plant flora in Deokjeokdo and its adjacent regions (Mungapdo, Soyado), Ongjin-gun, South Korea, from April to October 2014. Based on the voucher specimens, vascular plants in this area consisted of 108 families, 362 genera, 578 species, 5 subspecies, 66 varieties and 4 forms, totally 653 taxa. In the flora of this area, 5 taxa of Korean endemic plants were found distributed in the sites, including Hepatica insularis Nakai and Asarum glabrata (C.S.Yook & J.G.Kim) B.U.Oh. Korean rare and endangered plants found in this area were 1 taxa of Critical Endangered Species (CR) and 5 taxa of Vulnerable Species (VU). The floristic regional indicator plants found in this area were 67 taxa comprising 3 taxa of grade V, 2 taxa of grade IV, 12 taxa of grade III, 3 taxa of grade II and 47 taxa of grade I. Naturalized plants consisted of 67 taxa, such as Chenopodium album L. and Erigeron annuus (L.) Pers. were recognized widely distributed in the area.

• Journal of National Security and Military Science
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• s.13
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• pp.137-658
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• 2016

1. Movement of the leaders of the Silla army The leaders of the Silla army traveled from Gyeongju(경주) to Icheon (이천), Deokjeokdo(덕적도) Island, and Hwangsanwon(황산원) during the period of the Against Baekje(백제) War that began in 660. Movement route between Gyeongju and Icheon : Gyeongju(경주)-Daegu(대구)-Gumi(구미)-Gimcheon(김천)-Chupungryeong(추풍령)-Geumdol Fortress(금돌성)-Boeun(보은)-Jincheon(진천)-Juksan(죽산)-Bubal-eup(부발읍) Movement route between Bubal-eup and Deokjeokdo Island : Bubal-eup(부발읍)-Ipo(이포) Ferry-Haengju(행주) Ferry-Palmido (팔미도) Island-Seonjaedo(선재도) Island-Yeongheungdo(영흥도) Island-Pido(피도) Island-Soyado(소야도) Island-Deokjeokdo(덕적도) Island Movement route between Deokjeokdo Island and Hwangsan: Deokjeokdo(덕적도) Island-Danghangpo(당항포)-Jincheon(진천)-Boeun (보은)-Okcheon(옥천)-Geumsan(금산)-Tanhyeon(탄현)-Hwangsan (황산)-Ganggyeong(강경)-Buyeo(부여) 2. Movement of the combat units of the Silla army Jincheon area : 4,325 persons of the Geupdang unit(急幢) and 611 persons of the Kaegeumdang unit(罽衿幢) were deployed. These units moved from Jincheon to Cheongju, Yeongi, and Gongju, and contained Ungjin Fortress(熊津城) (6,650 Baekje troops). Boeun area : 4,763 persons of the Daedang(大唐) unit, 3,548 persons of the Hajujeong unit(下州停), 3,017 persons of the Namcheonjeong unit(南川停), and 4,500 persons of the Saseoldang unit(四設幢) were deployed. These units moved from Boeun(보은) to Okcheon(옥천), Geumsan(금산), Tanhyeon,(탄현) and Hwangsan(황산). Geumdol Fortress area : 3,753 persons of the Sangjujeong unit(上州停), 5,762 persons of the Seodang unit(誓幢), 3,753 persons of the Guidang unit(貴幢), and 5,562 persons of the Nangdang uni(郎幢)t were deployed. These units moved from Geumdol Fortress to Hwanggan(황간), Yeongdong(영동), Geumsan(금산), Tanhyeon(탄현), and Hwangsan(황산). Jirye area: 3,017 persons of the Eumrihwajeong unit(音里火停) and 3,017 persons of the Ehwahyejeong unit(伊火兮停) were deployed. These units moved from Jirye(지례) to Juchiryeong(走峙嶺), Mupung (무풍), Muju-eup(무주읍), and Bunam-myeon(부남면) in Muju-gun. Goryeong area: 3,017 persons of the Samryanghwajeong unit(三良火停) and 3,017 persons of the Sosamjeong unit(召參停) were deployed. These units moved from Goryeong(고령) to Geochang(거창), Hamyang(함양), Namwon(남원), Sunchang(순창), and Jeongeup(정읍). 3. Movement of the Tang army Dangjin area(당진 방면) : 1,000 persons were deployed. These units moved from Dangjin(당진) to Myeoncheon(면천), Yesan(예산), and Imjon Fortress(임존성). Garijeo area(가리저 방면) : 1,000 persons were deployed in the Garijeo(加里渚) area. These units moved from Garijeo(가리저) to Myeoncheon(면천), Yesan(예산), and Imjon Fortress(임존성). Geumganggu area(금강구 방면) : 000 persons were deployed. These units moved from Geumganggu(금강구) to Ganggyeong(강경) and Sabi Fortress(사비성). 4. Baekje military deployment Total troops of the Baekje army : There were 60 thousand Baekje troops according to the Old Book of Tang(舊唐書). Troop deployment by the Baekje army: 62,230 persons were deployed in 15 regions: 1,000 in Dangjin(당진), 1,000 in Garijeo(가리저), 6,120 in Imjon Fortress(임존성), 1,120 in Namjam Fortress(남잠성), 1,350 in Dooryangyun Fortress(두량윤성), 870 in Wangheungsajam Fortress(왕흥사잠성), 6,650 in Ungjin Fortress(웅진성), 1,120 in Jinhyeon Fortress(진현성), 1,000 in Dooshiwonak(두시원악), 1,000 in Irye Fortress(이례성), 5,000 in Gosaburi Fortress(고사부리성), 5,000 in Gujiha Fortress(구지하성), 3,000 plus 3,000 in Gibeolpo and Yangan(기벌포 양안), 5,000 in Deukan Fortress(득안성), and 20,000 in Sabi Fortress(사비성).

• Journal of the Korean earth science society
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• v.39 no.6
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• pp.555-567
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• 2018

In order to identify the characteristics of sea surface temperature (SST) differences between microwave SST from GCOM-W1/AMSR2 and in-situ measurements in the western coast of Korea, a total of 6,457 collocated matchup data were produced using the in-situ temperature measurements from marine buoy stations (Deokjeokdo, Chilbaldo, and Oeyeondo) from July 2012 to December 2017. The accuracy of satellite microwave SSTs was presented by comparing the ocean buoy data of Deokjeokdo, Chilbaldo, and Oeyeondo stations with the AMSR2 SST data more than five years. The SST differences between the microwave SST and the in-situ temperature measurements showed some dependence on environmental factors, such as wind speed and water temperature. The AMSR2 SSTs were tended to be higher than the in-situ temperature measurements during the daytime when the wind speed was low ($<6ms^{-1}$). On the other hand, they showed positive deviation increasingly as the wind speed increased for nighttime. In addition, increasing tendency of SST differences was related to decreasing sensitivity of microwave sensors at low temperatures and data contamination by land. A monthly analysis of the SST difference showed that unlike the previous trend, which was known to be the largest in winter when strong winds were blowing, the SST difference was largest in summer in Deokjeokdo and Chilbaldo buoy stations. This seemed to be induced by differential tidal mixing at the collocated matchup points. This study presented problems and limitations of the use of microwave SSTs with high contribution to the SST composites in the western coastal region off the Korean peninsula.

• Animal Systematics, Evolution and Diversity
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• v.24 no.1
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• pp.9-16
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• 2008

Cerapus longicervicum, a new species of ischyrocerid amphipods, was isolated from the vicinal sea of Deokjeokdo-Island, Incheon (South Korea). This species is characterized by a narrower coxal plate width of gnathopod 1 in male, which is 0.39 times as broad as pereonite 1, and antenna 2, which is longer than antenna 1. This paper also provides the partial sequence of the mitochondrial cytochrome c oxidase subunit 1 (CO1) of the new species, which was obtained from a specimen that was preserved in 4% formalin solution.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.3
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• pp.129-138
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• 2017

The coastal wave environment is a very important factor that directly affects the change of coastal topography, the habitat of marine life, and the design of offshore structures. In recent years, changes in the wave environment due to climate change are expected, and a trend analysis of the wave environment using available data sets is required. In this paper, significant wave heights which are measured at six ocean buoys (Deokjeokdo, Oeyeondo, Chibaldo, Marado, Pohang, Ullengdo) have been used to analyze long-term trend of normal waves. In advance, the outlier of measured data by Korea Meteorological Administration have been removed using Rosner test. And Pearson correlation analysis between the measured data and ECMWF reanalysis data has been conducted. As a results, correlation coefficient between two data were 0.849~0.938. Meanwhile, Mann-Kendall test has been used to analyze the long-term trend of normal waves. As a results, it was found that there were no trend at Deokjeokdo, Oeyeondo and Chibaldo. However, Marado, Pohang and Ullengdo showed an increasing tendency.

• Korean Journal of Environmental Biology
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• v.28 no.3
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• pp.158-171
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• 2010

The flora of Deokjeok Island was investigated 35 times from September 2007 to September 2008. Based on voucher specimens, the study indicated that this area consisted of 535 taxa in total; 108 families, 320 genera, 480 species, 2 subspecies, 45 varieties and 8 forms were present. Compositae and Graminae were the first and second most common families surveyed in the region, respectively. Among the more remarkable examples found were four taxa of Korean endemic plants, six taxa of rare and endangered plants designated by National Arboretum, and 55 taxa of specific plants that have been designated by the Ministry of Environment. Furthermore, 50 taxa of naturalized plants were observed and they occupied 17.9% of the total in the surveyed area. Although some parts of the investigated region were disturbed by human impact, the ecological status was comparatively well preserved. However, the area where the remarkable plants were discovered should be more systematically protected. Since the proportion of naturalized plants in the human habitation area was considerably high and the spreading of these plants seems consistent, it is expected that the ecosystem of this area may become critically unstable in near future.

• Animal Systematics, Evolution and Diversity
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• v.19 no.2
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• pp.283-296
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• 2003

Actiniarians were collected from the sandy mud flat of Deokjeokdo, Jak-yakdo, Yeoungjongdo and Hupo of Korean waters from 1962 to 1998. They are identified into three species of two families, which are newly recorded to Korean athenarian fauna: Synandwakiu multitentaculata n. sp., Edwardsioides japonica (Carlgren, 1931) and Metedwardsia akkeshi (Uchida, 1932). They are described in detail with figures and tables. Synandwakia multitentaculata n. sp. is easily distinguished from S. hozawai by having up to 200 in the number of tentacles and by the peculiar macrobasic amastigophores of tentacles and the larger microbasic p-mastigophores of acontia in the macrocnidae.

• Ocean and Polar Research
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• v.41 no.4
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• pp.213-232
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• 2019

This study evaluates the accuracy of four satellite-composite (OSTIA, AVHRR, G1SST, FNMONC-S) and three model-reanalysis (HYCOM, JCOPE2, FNMOC-M) daily sea surface temperature (SST) data around the Korean Peninsula (KP) using ocean buoy data from 2011-2016. The results reveal that OSTIA has the lowest root mean square error (RMSE; 0.68℃) and FNMOC-S/M has the highest correction coefficients (r = 0.993) compared with observations, while G1SST, JCOPE2, and AVHRR have relatively larger RMSEs and smaller correlations. The large RMSEs were found in the western coastal regions of the KP where water depth is shallow and tides are strong, such as Chilbaldo and Deokjeokdo, while low RMSEs were found in the East Sea and open oceans where water depth is relatively deep such as Donghae, Ulleungdo, and Marado. We found that the main sources of the large RMSEs, sometimes reaching up to 5℃, in SST data around the KP, can be attributed to rapid SST changes during events of strong tidal mixing, upwelling, and typhoon-induced mixing. The errors in the background SST fields which are used in data assimilations and satellite composites and the missing in-situ observations are also potential sources of large SST errors. These results suggest that both satellite and reanalysis SST data, which are believed to be true observation-based data, sometimes, can have significant inherent errors in specific regions around the KP and thus the use of such SST products should proceed with caution particularly when the aforementioned events occur.

• Journal of Ecology and Environment
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• v.46 no.4
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• pp.292-303
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• 2022

Background: Climate change significantly influences the geographical distribution of plant species worldwide. Selecting indicator species allows for better-informed and more effective ecosystem management in response to climate change. The Korean Peninsula is the northernmost distribution zone of warm temperate evergreen broad-leaved (WTEB) species in Northeast Asia. Considering the ecological value of these species, we evaluated the current distribution range and future suitable habitat for 13 WTEB tree species designated as climate-sensitive biological indicator species. Results: Up-to-date and accurate WTEB species distribution maps were constructed using herbarium specimens and citizen science data from the Korea Biodiversity Observation Network. Current northern limits for several species have shifted to higher latitudes compared to previous records. For example, the northern latitude limit for Stauntonia hexaphylla is higher (37° 02' N, Deokjeokdo archipelago) than that reported previously (36° 13' N). The minimum temperature of the coldest month (Bio6) is the major factor influencing species distribution. Under future climate change scenarios, suitable habitats are predicted to expand toward higher latitudes inland and along the western coastal areas. Conclusions: Our results support the suitability of WTEB trees as significant biological indicators of species' responses to warming. The findings also suggest the need for consistent monitoring of species distribution shifts. This study provides an important baseline dataset for future monitoring and management of indicator species' responses to changing climate conditions in South Korea.