• Korean Journal of Environmental Biology
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• v.33 no.4
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• pp.441-449
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• 2015

This study was conducted to screen the characteristics of external and cranial characters of Crocidura shantungensis collected from Korean Peninsula, Ulleung Island and Jeju Island. There were significant differences in head-body length (HBL), tail length (TL), ear length (EL), and hind foot length (HFL) in males and HBL, TL, and HFL in females among three populations (p<0.05). The HBL and TL in the Jeju Island population were larger (8.0 mm and 4.0 mm in lengths, respectively) than those of the Korean Peninsula population. Based on skull analysis, a total of thirteen traits showed significant differences among the three populations (p<0.05). The condylo-insicive length (CIL), maximum width of brain case (MWB), mandibular length (ML), and mandibular height (MH) in the Jeju Island population were significantly larger than those of Korean Peninsula population (p<0.05). Principle component analysis (PCA) showed that two principle components (PC) identified from the PCA affected on the body size and width of the skull, respectively. Discriminant analysis revealed that these populations could be discriminated through skull traits. These findings concluded that the Jeju Island population was greater in the size than the Korean Peninsula, suggesting that the Jeju Island shrews have successfully adapted to the island environments and they had morphologically differentiated during glacial period after natural immigration into that Island. Thus, this study supports the 'Island Rule', showing that the population is well adapted to the island environments. This may provide important information for biogeographical and ecological studies on insular animals.

• Journal of Ocean Engineering and Technology
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• v.33 no.6
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• pp.607-614
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• 2019

It has been an issue among researchers that the tsunamis that occurred on the west coast of Japan in 1983 and 1993 damaged the coastal cities on the east coast of Korea. In order to predict and reduce the damage to the Korean Peninsula effectively, it is necessary to install offshore tsunami observation instruments as part of the system for the early detection of tsunamis. The purpose of this study is to recommend the optimal deployment of tsunami observation instruments in terms of the higher probability of tsunami detection with the minimum equipment and the maximum evacuation and warning time according to the current situation in Korea. In order to propose the optimal location of the tsunami observation equipment, this study will analyze the tsunami propagation phenomena on the east sea by considering the potential tsunami scenario on the west coast of Japan through numerical modeling using the COrnell Multi-grid COupled Tsunami (COMCOT) model. Based on the results of the numerical model, this study suggested the optimal deployment of Korea's offshore tsunami observation instruments on the northeast side of Ulleung Island.

• Korean Journal of Medicinal Crop Science
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• v.14 no.6
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• pp.354-359
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• 2006

Chromosome analysis using mitosis, meiosis and bicolor FISH were carried out in Bupleurum latissimum Nakai, which is one of the endemic plants in Ulleung island of korea. The somatic methaphase chromosomes number of this plant was 2n = 2x = 16 and the chromosome complements consisted of six pairs of metacentrics and two pairs of submetacentrics. The size of chromosomes ranged 2.40${\sim}$4.20 ${\mu}$m and NOR (nucleolus organizer region) chromosome did not observed using conventional staining. In meiosis chromosomes, metaphase-I and anaphase-I were observed. Metaphase-I anaphase-I showed 8 bivalents and chromosomes migration to make two daughter cells. Using bicolor FISH, one pair of 5S and 45S rDNA signals were detected on the centromeric region of chromosome 3 and the end of short of chromosome 2,respectively. We also observed the NOR using 45S rDNA probe.

• Journal of Bio-Environment Control
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• v.20 no.1
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• pp.14-20
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• 2011

Objective of this research was to investigate the volatile aroma compounds and phenol contents for preservative effects. Aerial part of 5 Korean natured species of thyme located in Jeju alpine, jeju middle mountain, Kyeonggido, Ulleung island, and Gangwondo was analyzed by thermal desorption gas chromatograph mass spectrometer (TD-GC-MSD) method. Jeju middle mountain thyme was relatively high 62 species and has been investigated a high concentration of $7365.22{\mu}g/m^3$ contents according to the quantitative analysis. Total phenol contents containing thymol and carvacrol of Jeju middle mountain thyme were relatively high and showed 35.92%.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.109.1-109.1
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• 2011

KEPCO was operating power plants with diesel generators in 49 islands including Baekryeong-Do, and the generation capacity was about 66 MW in 2008. The cost of fuel is increasing by the international oil price inflation and continuous rise of oil price is predicted. For the stabilizing of electric power supply to the separate islands, renewable energy and fuel cell systems were considered. Hydrogen is made using renewable energy such as wind power and solar energy, and then a fuel cell system generates electricity with the stored hydrogen. Though the system efficiency is low, it is treated as the only way to secure the stable electric supply using renewable energy at this present. The analytic hierarchy process was used to select suitable candidate island for the system installation and 5 islands including Ulleung-Do were selected. Economic evaluation for the system composed of a kerosene generator, a wind power, an electrolysis, and a fuel cell system was conducted with levelized generation cost based on present value methode. As the result, the necessity of renewable energy combined generation system and micro grid composition in the candidated islands was confirmed. Henceforth, the development of an integration technology which connects micro grid to the total power grid will be needed.

• Mycobiology
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• v.45 no.3
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• pp.150-159
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• 2017

This study analyzed the distribution of endophytic fungi in 3 coastal environments with different climatic, geographical, and geological characteristics: the volcanic islands of Dokdo, the East Sea, and the West Sea of Korea. The isolated fungal endophytes were characterized and analyzed with respect to the characteristics of their host environments. For this purpose, we selected common native coastal halophyte communities from three regions. Molecular identification of the fungal endophytes showed clear differences among the sampling sites and halophyte host species. Isolates were also characterized by growth at specific salinities or pH gradients, with reference to previous geographical, geological, and climate studies. Unlike the East Sea or West Sea isolates, some Dokdo Islands isolates showed endurable traits with growth in high salinity, and many showed growth under extremely alkaline conditions. A smaller proportion of West Sea coast isolates tolerate compared to the East Sea or Dokdo Islands isolates. These results suggest that these unique fungal biota developed through a close interaction between the host halophyte and their environment, even within the same halophyte species. Therefore, this study proposes the application of specific fungal resources for restoring sand dunes and salt-damaged agricultural lands and industrialization of halophytic plants.

• YAKHAK HOEJI
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• v.51 no.6
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• pp.508-516
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• 2007

Thymus magnus is an endemic (Ulleung Island) species in Korea. This plant is used as diaphoretics and carminatives in traditional medicine. In the literature, few scientific assays were realized on this species, such as antibiotic (Streptococcus pneumoniae, Staphylococcus aureus, Salmonella enteritidis, and S. typhimurium) and antifungal activities. In order to clarify whether essential oil of T. magnus have pharmacological effects, anti-inflammatory, sedative, anti-depressant, analgesic, and sleep-prolonged effects were investigated using animal models. From this study, the following conclusions were attained; 1) Essential oil of T. magnus did not show any acute toxicity on mice when orally administered at the dose of 2-3 g/kg body weight. 2) Essential oil of T. magnus possessed strong anti-inflammatory activity, similar to that of a positive control prednisolone. 3) Essential oil of T. magnus had excellent analgesic activity, comparable to that of aspirin. 4) The essential oil of T. magnus possessed strong sleep-prolonged effect on pentobarbital induced-sleep test in mice model. 5) In the hot plate test, the essential oil of T. magnus had moderate effect. 6) And the essential oil of T. magnus had no significant effects in forced-swimming test and open-field test.

• Korean Journal of Plant Resources
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• v.25 no.4
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• pp.490-497
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• 2012

Phylogenetic analyses were conducted to evaluate relationships of 5 taxa of Korean Hydrocotyle, H. spp. found in the Ulleung island including one outgroup (Centella asiatica). The molecular phylogenetic methods based on nuclear ribosomal DNA ITS region and cpDNA trnH-psbA region. Centella asiatica was used outgroup for analysis. As the result, genus Korean Hydrocotyle were grouped by 94% bootstrap value. Korean Hydrocotyle was grouped by four clades; Clade I-H. maritima, H. sibthorpides and H. yabei clade Clade II-H. nepalensis clade clade III-H. ramiflora clade clade IV-H. spp. clade. H. maritima, H. sibthorpides and H. yabei was not distinguished, seperately. H. spp. was distinctly distinguished other Korean Hydrocotyle.

• Journal of Environmental Science International
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• v.16 no.6
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• pp.751-761
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• 2007

This study is carried out through ecological situation of native Bupleurum latissimum habitats and the research of environmental conditions for conservation of native sites, restoration of alternative habitats and preliminary data for application of useful medicinal plant. Native Bupleurum latissimum habitats were distributed on lower and middle part of the mountain from Altitude 54m to 185m, and the directions of slope were researched as usually northen and western slope. As a result of phytosociological research in 12 stands of native Bupleurum latissimum habitats, they were seperated to two communities(Bupleurum latissimum typical community and Bupleurum latissimum-Galium spurium community) in accordance with containable rate of the organic matter and soil hardeness. Soil condition is usually constituted as loamy sand and clay loam. Bupleurum latissimum is propagated in valuable soil conditions. Bupleurum latissimum lives with Morus bombycis, Reynoutria sachalinensis in Bupleurum latissimum typical community and Thalictrum aquilegifolium, Stellaria media, Hedera rhombea etc. is appeared with Bupleurum latissimum in Bupleurum latissimum-Galium spurium community. Especially, companion species were researched as Aster glehni, Dystaenia takeshimana and so on. The flora of vascular plants in this study is 44 families, 88genus 82species, 2 subspecies, 14 varietas, 4 forma and total 102 taxa. Plants of compositae occupied 10.78% among whole of them.

• ALGAE
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• v.29 no.2
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• pp.111-120
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• 2014

Polysiphonia sensu stricto is characterized by having 4 ecorticate pericentral cells, rhizoids in open connection with the pericentral cells, four-celled carpogonial branches, spermatangial branches replacing the whole trichoblast, and tetrasporangia arranged in straight series. Polysiphonia ulleungensis sp. nov. is newly described from Sadongri, Ulleung Island, Korea, based on morphological and molecular evidence. It is mainly characterized by having ecorticate axes with 4 pericentral cells, apical cells transversely or obliquely divided, unicellular rhizoids in open connection with pericentral cells, very scarce trichoblasts and scar cells, procarps with a four-celled carpogonial branch, and spermatangial branches replacing the whole trichoblast. Polysiphonia ulleungensis is closely similar in morphology to P. atlantica sensu lato. We concluded that materials of P. atlantica sensu Nam and Kang from Korea correspond to P. ulleungensis. By contrast, the new species differs morphologically from the Atlantic specimens of P. atlantica as well as from P. atlantica sensu Kim and Lee from Korea. Morphological characteristics and rbcL sequence analyses support the taxonomic placement of P. ulleungensis within Polysiphonia sensu stricto.