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The Marine Amphipod Crustaceans of Ulreung Island, Korea: Part I (울릉도 해역의 단각류(갑각류))

  • Kim, Won;Kim, Chang-Bae
    • The Korean Journal of Zoology
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    • v.34 no.2
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    • pp.232-252
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    • 1991
  • This study on the four families (Ampithoidae, Corophiidae, Dulichlldae, and lschyroceridae) of amphipods of Ulreung Island was based on the materials collected at eight localities in Ulreung Island. Eleven species of nine genera in four familles were identified. Of these, four (Sunamphithoe sineplumosa, Podocerus ulreungensis, P. hoonsool, and Ventojassa dentipal ma) were new to science. All eleven species were new records for Ulreung Island. Six species were described and illustrated. The keys to all eleven species and higher taxa were provided.

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A Study on Electrical Characteristic Improvement & Design Parameters of Power MOSFET with Single Floating Island Structure (단일 Floating Island 구조 Power MOSFET의 전기적 특성 향상과 설계 파라미터에 관한 연구)

  • Cho, Yu Seup;Sung, Man Young
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.4
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    • pp.222-228
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    • 2015
  • Power MOSFETs (metal oxide semiconductor field effect transistor) operate as energy control semiconductor switches. In order to reduce energy loss of the device, it is essential to increase its conductance. However, a trade-off relationship between the breakdown voltage and conductance of the device have been the critical difficulty to improve. In this paper, theoretical analysis of electrical benefits on single floating island power MOSFET is proposed. By the method, the optimization point has set defining the doping limit under single floating island structure. The numerical multiple 2.22 was obtained which indicates the doping limit of the original device, improving its ON state voltage drop by 45%.

A New Record of Smittinid Bryozoa (Gymnolaemata, Cheilostomata) from Manjae Island, Korea (만재도의 한국 미기록 입이끼벌레류(나후강, 순구목) 1종)

  • Seo, Ji-Eun
    • Animal Systematics, Evolution and Diversity
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    • v.18 no.1
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    • pp.135-141
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    • 2002
  • One of bryozoans collected from the subtidal zone of Manjae Island on Aug. 23, 1988 was identified. Parasmittina delicatula (Busk, 1884) turned out to be new to the Korean fauna. Therefore, twelve bryozoan species are reported from Manjae Island so far. Ten species including the present one among them were recorded only from the Pacific Ocean. They consisted of four tropical, three cold temperate and four endemic species to Korea and Japan. It is quite probable that Manjae Island, which is influenced by both warm and cold water currents, seems to be unique and significant area in terms of marine zoogeography.

A research of Cheju Island plain coarse pottery and pantiles magnetism characteristic

  • Yoon, Tae-Gun;Park, Won-Jun;Ko, Jeong-Dae;Hong, Sung-Rak
    • Proceedings of the Korean Magnestics Society Conference
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    • 2000.09a
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    • pp.413-420
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    • 2000
  • Cheju Island has nature of typical trass through volcanic activities in many times. The soil in Cheju Island has principally sprung from basalt and partially made up of trachyte, trachyte's nature and site. Also ancient relics, plain coarse pottery's kilns and pantiles kilns are homogeneously distributed all over the Cheju Island. In this study, as a result of X-ray fluorescence spectrometer and Mossbauer spectroscopy of a sample are from plain coarse pottery and pantiles in 5 regions of Cheju Island. It is thought that these samples are partially formed from neutral volcanic rock like trachyte and Atomicity state of iron is almost Fe$\^$3+/. Also the magnetic hyperfine field length of goethite, contained these samples is less than synthetic goethite magnetic hyperfine field length and this result shows that disintegration of inner magnetic order, created by partial substitution of diamagnetic positive ion containing Fe$\^$3+/ and Al$\^$3+/ in goethite lattice.

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Plants in the crater of Halla-San (Mt. Halla) and Plants in To-do (Island) (한라산 화구내 식물과 토도식물)

  • 이영노;이명보
    • YAKHAK HOEJI
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    • v.4 no.1
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    • pp.21-34
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    • 1959
  • (1) Plants in the crater of Halla-San (Mt. Halla), a conical volcano that originated in the Tertiary period, were studied on three different occasions; July 1937, July 1955, and August 1957, and noted 52 familites, 149 species. In the latest study undergone in 1957, the authors collected 108 species. Notable species among them are Geranium Shikokianum Matsum which has not been reported in Korea, Clematis Chiisanensis Nakai, Lactuca Chelidonifolia Makino, and Platanthera Maximowiczana Schelchter which have not been reported in Jeu-Do(Island) so far. (2) Plants in To-Do(Island), territorial island of Jeju-do, were also studied. The authors noted Canavalia lineata D.C.non-reported Species in Korea, usually distributed along Southern Honshu, Shikoku, and Kyushu of Japna, Ryukyu and Taiwan. The overfall flora of the island is composed of 30 families, 44 Species; 5 Species of wood plants and 39 species of herbs, and is mostly of littoral plants.

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Ecological Study on the Flora in Poong Island (풍도 식물상에 관한 생태학적 연구)

  • Lee, Il Koo;Ho Jin Youn;Young Hee Lee
    • The Korean Journal of Ecology
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    • v.5 no.4
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    • pp.154-163
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    • 1982
  • An ecological survey on the vegetation of Poong Island was conducted for 2 days from August 19 through 20, 1981 and the results obtained are summarized as follows: Flora of this island consist of 65 families, 157 genera, 167 species, 27 varieties and 3 forma of which herbs are classified into 38 families, 98 genera, 98 species, 20 varieties, 2 forma and trees into 33 families, 61 genera, 69 species, 7 varieties and 1 forma. Evergreen broad-leaved trees are scanty in distribution and only Eionymus japonia thunb. and Euonymus forannei var. radicans (Sieb. et Miq) Rehder are observed. The dominant species of this island is Pinus densiflora. Due to the low density of population (149.8) and low pure farming rate of this island, the destruction of nature is rarely to be noticed and therefore natural vegetation may be considered to have been well preserved.

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Estimating the Heat Island Development Using Landsat TM and AMeDAS Data

  • Harada, Ippei;M.A., Mohammed Aslam;Kondoh, Akihiko
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.450-452
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    • 2003
  • In the present investigation, an estimation of the growth of heat island development of Tokyo metropolis which accounts nearly 100 sq. km of areal spread has been carried out. Band 6 data of LANDSAT TM (Thematic Mapper) data acquired on August 1984 and 1994 have been used for estimating the expansion of the heat island development. Since the vegetation decrease is usually associated with the heat island development, a ratio of green covering has also been assessed using TM data. In order to establish the relationship with the air temperature, AMeDAS(Automated Meteorological Data Acquisition System) data have been correlated.

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The Marine Decapod Crustaceans of Geojedo Island and Its Adjacent Islets, Korea (거제도의 해산 십각류)

  • Sa Heung Kim;Won Kim
    • Animal Systematics, Evolution and Diversity
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    • v.14 no.3
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    • pp.293-309
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    • 1998
  • A taxonomic study for clarifying the decapod fauna of Gejedo Island, Korea was performed. Seventy nine species in 28 families were identified through the present investigation and of which 9 species of shrimps, 7 species of anomurans, and 39 species of crabs are newly added to the decapod fauna of this area. With the previously known 40 species, a total of 93 decapod species from this island and its adjacent islets are listed, and Pugettia quadridens intermedia Sakai, 1939 is redescribed with illustrations. The zoogeographical aspects of Geojedo Island are also discussed based on the composition of geographical forms of brachyuran decapods.

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Selection Attributes on Behaviour Intention of Island Tourism : focused on Chuja region (도서 관광지의 선택속성, 서비스 가치, 만족도 및 행동의도 관계 연구: 추자도를 대상으로)

  • Choi, Yong-Bok;Boo, Chang-San;Kim, Min-Cheol
    • Journal of Fisheries and Marine Sciences Education
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    • v.24 no.3
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    • pp.406-415
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    • 2012
  • The objective of this paper was to analyze the relationships between the factors of selection attributes and the behavior intention focusing on Domestic tourists in Chuja island. This paper utilized the path analysis to investigate the factors of selection attributes affecting the visitors' satisfaction and re-visit intention through service value as mediating factor. This study showed the most important thing among the factors influencing service value in research model was 'uniqueness of island'. Finally, this paper presented that the selection attributes had affected overall satisfaction and re-visit intention through the mediation of service value. In addition, this study calculated total effect including indirect and direct effect of the choice attributes on behavior intention. This result can give the stakeholders related to Chujado island a implication for a better policy of tourism development.

Molecular Detection of Coxiella burnetii in Cattle on Ulleung Island, Korea: A Population-based Study with Four Years of Follow Up

  • Seo, Min-Goo;Kwon, Oh-Deog;Kwak, Dongmi
    • Parasites, Hosts and Diseases
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    • v.57 no.1
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    • pp.69-73
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    • 2019
  • In a population-based study with 4 years of follow up, we evaluated the prevalence of Coxiella burnetii in cattle on Ulleung Island, Korea. In this study, the rates of C. burnetii infection in cattle on Ulleung Island were determined by PCR and were found to be 0.3-1.0% in the period 2011-2014. All 17 C. burnetii partial 16S rRNA gene sequences from PCR-positive cattle were identical and 2 geographic representatives were included in our analysis. The nucleotide sequences of the 2 samples showed high (98.4-100%) identity with C. burnetii sequences obtained from the GenBank. In this long-term tracking study, the number of cattle positive for C. burnetii on Ulleung Island was low. To prevent the transmission of C. burnetii on Ulleung Island, control strategy should include biosecurity improvement in surveillance, livestock management, administering suitable tests before purchasing animals to detect C. burnetii shedders, and restricting movements between herds.