• Geosciences Journal
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• 제22권6호
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• pp.1069-1080
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• 2018

The Alaskan Aleutian Islands form one of the world's largest volcanic island chains. The islands are exposed to both direct and indirect damage from continuous volcanic eruptions. Surface deformation is mostly observed before volcanic eruption, but with some volcanoes, such as Ontake Volcano, deformations cannot be detected. In this study, we analyzed volcanic eruptions in the Alaskan Aleutian Islands, which is a region of frequent volcanic eruptions. Based on our results, we predicted the type of eruption that would occur on Baekdusan Volcano according to the presence or absence of surface deformation. For this purpose, 10 sites were selected from areas where recent volcanic activity had occurred in the Aleutian Islands. Additionally, Advanced Land Observing Satellite Phased Array-type L-band Synthetic Aperture Radar (ALOS-PALSAR) and European Remote Sensing (ERS)-1/2 satellite data were obtained from 10 experimental sites. Based on the radar satellite data, the volcanic surface deformations were identified, and the characteristics of the volcanic eruption were quantitatively calculated by determining the presence of surface deformation. The results of this study should facilitate the process of correlation between volcanic eruption and surface deformation.

• The Korean Journal of Ecology
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• 제25권5호
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• pp.341-348
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• 2002

본 연구는 환경부의 '전국 무인도서 자연환경조사 보고서(1999년∼2001년)'에서 발췌한 261개의 무인 도서를 대상으로 섬의 지리적 환경과 섬에 분포하는 관속식물의 종수 및 분포사이의 상관성을 구명하고자 수행하였다. 261개 도서의 평균 면적은 75,000㎡이며, 면적의 분포범위는 최소 1,l00㎡에서 최대 961,200㎡였다. 육지와의 최단거리 평균은 14.9km(150m∼51.4km)이었다. 261개 도서에서 관찰된 전체 종수는 30과 1,109 종으로, 각 도서당 관찰된 종수의 평균은 98.7종이었다. 자생식물은 1,003종(90.4%)이었으며, 귀화식물은 106종(9.6%)로 조사되었다. 그리고 조사된 전체 종수 중에서 국화과가 114종으로 가장 많았으며, 벼과 (90종), 콩과(54종), 장미과(53종) 순으로 나타났다. 261개 섬은 출현한 식물종의 구성에 근거하여 다차원척도분석을 실시한 결과 '남해그룹(130개 섬)'과 '서해그룹(131개 섬)'의 두 지역으로 뚜렷이 구분할 수 있었다. 서해그룹에 속하는 섬들은 남해그룹의 섬들에 비해 면적이 더 넓었으나(서해그룹 평균=93,000㎡, 남해그룹 평균=57,000㎡), 도서당 출현 종수는 적었다(서해그룹 평균=192, 남해그룹 평균=233). 또한 서해그룹보다는 남해그룹에만 한정적으로 분포하는 종들이 두 그룹을 구분하는데 더욱 큰 영향을 미치는 것으로 나타나서, 위도에 따른 식물 분포를 반영하고 있다. 출현하는 식물 종수에 가장 큰 영향을 미치는 인자는 섬의 면적이었으며, 육지와의 최단거리와 인간의 간섭 인자 순으로 나타났다. 식물종수에 미치는 환경인자들은 서해그룹과 남해그룹에서 각기 다르게 나타났으며, 남해그룹의 섬들이 서해그룹의 섬들에 비하여 육지와의 거리가 가깝고 단위면적당 출현 종수가 많았기 때문에 보다 다양한 환경인자들에 의해 민감하게 영향을 받는 것으로 생각된다. 따라서 이상의 결과들은 무인도서 생태계 보존을 위해 중요하게 활용될 것으로 기대되며, 앞으로 인간간섭과 귀화식물종이 무인도서 생태계에 미치는 영향에 대한 연구가 계속적으로 이루어질 것이다.

• ETRI Journal
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• 제19권2호
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• pp.71-81
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• 1997

We report on the room-temperature-growth of highly uniform and ultrathin Ag films on Sb-terminated Si(111) surfaces, as evidenced from a scanning tunneling microscopy (STM) study in an UHV system. With predeposition of one monolayer (ML) of Sb, uniform growth of Ag islands was observed at room temperature. The Sb layer suppresses the surface diffusion of Ag atoms on Si surface and increases the Ag island density, and then the increased island density is believed to cause coalescence of Ag islands before the beginning of multilayer growth in higher coverages, resulting in the growth of atomically flat and uniform islands on the Sb surfactant layer.

• 한국동물학회지
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• 제37권3호
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• pp.352-376
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• 1994

Fifteen species in 10 families of Opisthobranchia were collected from Ulung and Dog-do Islands, Korea. Eight species of them, Cadlina japonica Baba, Aldisa cooperi Robilliard & Baba, Dendrodoris denisoni (Angas), Tritonfu festive (Steams), Notobryon mardi Odhner, Hermissendo crussicornis (Eschscholtz), Sakuraeolis monesto (Bergh) and Protaeolidiella atru Baba were not recorded in Korean waters previously. In addtion to these 8 species, 5 species of Aplvsia purvufa Guilding in Miirch, Bethellino citrine (Riippell & Leuckart), Pfeurobronchoeo iaponica Thiele, Chromodoris tinctorio (Ri'spell & Leuckart), and Hypselodoris festive (A. Adams) are new to the fauna of Ullung and Dog-do Islands.

• The Korean Journal of Ecology
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• 제17권2호
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• pp.159-170
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• 1994

The geographical distribution and soil characteristics of Korean Elaeagnus plants were investigated by literatures, field survey and soil analysis. Deciduous E. umbellata was distributed throughout the Korean peninsula including western and southern islands. Distribution area of evergreen Elaeagnus plants was classified into three groups; E. macrophylla and E. glabra belonged to group l occurring in the southern, western and eastern islands; E. submacrophylla to group 2 occurring in the southern and western islands; E. maritima and E. ankaii to group 3 in the southern islands only. Deciduous E. umbellata appeared euryeciously from poor soil to rich one, whereas evergreen Elaegnus plants appeared stenoeciously in haline soil near coast.

• 환경생물
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• 제20권3호
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• pp.263-267
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• 2002

에콰로르의 수도인 키도와 갈라파고스에서 2000년 8월 1일부터 18일까지 거미상을 조사한 결과 총 562개체를 채집하였으며, 그 중 22과 48속 50종을 동정하여 보고하고자 한다. 이를 통해 키토와 갈라파고스 제도에는 배회성 보다 정주성 거미류가 더 우세한 것으로 확인되었으며, Gasteracantha cancriformis (Linnaeus 1758)가 우점종으로 나타났다. 이에 Gasteracantha cancriformis를 재기재하여 보고하고자 한다.

• 자원환경지질
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• 제53권5호
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• pp.631-643
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• 2020

The central-western Korean Peninsula contains records of an Early Mesozoic collisional event related to the final amalgamation of the East Asian continent. Here, we present a renewed geologic map of the Deokjeok and Soya islands in the central-western Korean Peninsula and its explanatory note. Our geologic map was based on a detailed investigation of the northeastern area of both islands, which is characterized by a complex fault and shear zone system that accommodated the crustal deformation related to the Mesozoic post-collisional orogenic collapse and the subsequent structural inversion. We suggest future directions of study aiming at addressing issues regarding the deformational responses of crust to the Mesozoic tectonic transition and orogenic cycles.

• Plant Resources
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• 제6권1호
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• pp.36-52
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• 2003

The medicinal plants in 22 unhabited islands of Jindo-gun, Chonnam provincde were investigated from March 2000 to October 2002. The medicinal plants in 22 uninhabited islands of Jindo-gun were consisted 366 taxa; 95 families, 269 genus, 309 species, 52 varieties, 3 forma, and 2 subspecies. Important medicinal plants on survey area were Lemmaphyllum microphyllum, Dendropanax morbifera, Ficus erecta, Farfugium japonicum, Machilus thunbergii, Juniperus chinensis var. procumbens, Dendrobium moniliforme, Pyrrhosia tricuspis, Cinnamomum japonicum, Pittosporum tobira, Kadsura japonica, and Daphniphyllum macropodum, This result can be used as basic information data for medicinal research and the conservation of uninhabited islands.

• Journal of Forest and Environmental Science
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• 제32권1호
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• pp.27-38
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• 2016

A total of 680 angiosperm plant species under 433 genera of 115 families have been recorded from the Southeast offshore Islands of Bangladesh including Nijhum Dwip, Hatiya, Sandwip, Kutubdia, Maheshkhali, Sonadia and Saint Martin's. Magnoliopsida is represented by 92 families, 344 genera and 546 species, whereas Liliopsida is represented by 23 families, 89 genera and 134 species. Habit analysis shows that herbs, shrubs, trees and climbers were represented by 331, 117, 169 and 63 species respectively. The plant diversity of the southeast offshore islands is under great risk because of many threats including natural and manmade. The aims of the present study are investigation, accumulation and documentation of the angiosperm plants of the area.

• Journal of Ecology and Environment
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• 제33권2호
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• pp.79-94
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• 2010

This article focused on the environmental changes on atolls in Micronesia. First, we considered the problem. Second, we designed research that focused on the impacts of environmental changes especially in relation to globalization and global warming in the Federated States of Micronesia (FSM). The results were in accordance to the hypotheses that globalization had impacted prominently in communities on main islands and impact was lessened with increased distance from the centre. The fact that the islands are remotely situated and thus, in theory, do not have much outside influence, has not alleviated them from having societal concerns. The earth's environmental change is causing an impact on the main islands as well. This has been governed by distinctive characteristics in their geographical, regional, and contents. Moreover, they showed stronger concerns about impacts on the environment than globalization. A set of questionnaires was used as the principal assessment method to quantify the concerns relating to the environmental changes.