• 한국산림과학회지
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• 제103권4호
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• pp.599-604
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• 2014

본 연구는 제주특별자치도 부속 53개 무인도서의 자연환경 특성을 분석하고, 산림자원관리의 우선순위를 판단하기 위하여 상대적인 중요도를 평가하였다. 우선 제주도 무인도서의 자연환경 특성을 분석해 본 결과, 산림동물종수(r = 0.762, p<0.01), 초본종수(r = 0.647, p<0.01), 목본종수(r = 0.585, p<0.01)순으로 산림규모와 높은 상관성이 있는 것으로 분석되었다. 그리고 도서지역 산림규모를 예측하기 위한 회귀모형은 R=0.899, $R^2=0.803$으로 나타났으며, 회귀식에 대한 설명력은 79.7%로 통계적으로 유의하였다. 무인도서의 산림규모별 유형화분석은 산림면적이 약 0.5 ha와 약 12 ha로 두 가지 그룹으로 분류되었다. 두 번째로 DEA를 이용하여 제주도 무인도서별 산림자원관리의 상대적인 중요도를 평가한 결과, DMU14(0.941), DMU36(0.964), DMU44(1.000), DMU45(0.903)등이 생물종다양성이 풍부하여 산림관리를 위한 우선순위가 높은 것으로 나타났다. 그리고 산림이 있는 무인도서의 상대적 중요도는 평균 0.439, 산림이 없는 무인도서는 평균 0.096으로 나타나 산림과 생물종 다양성에는 밀접한 관계가 있는 것으로 분석되었다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2009년도 공동학술대회
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• pp.452-455
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• 2009

낙동강 하구의 삼각주 전면에 연안사주지형의 발달이 급속하게 진행되고 있다. 이 연구는 고지도와 항공사진 등을 이용하여 낙동강 하구의 연안사주지형의 성장과 변화에 관하여 알아보았다. 낙동강 하구에는 여러 개의 연안사주들이 분포하고 있어 철새들의 서식지로도 널리 알려져 있다. 이들 연안사주들은 1861년 명호도를 시작으로 1904년 신호도, 진우도, 대마등, 1916년 을숙도, 장자도, 1955년 백합등, 1975년 새등(신자도)이 지형도상에 처음 등재되었다. 1986년에는 철새등(도요등)이 해수면상에 출현하였다. 2008년에는 철새등에서 다대포 해수욕장을 향하여 새로운 등이 성장하고 있어 다대포 해수욕장은 석호로 변하고 있고, 소형 어선들의 통항이 불가능하게 되고 있다. 낙동강 하구의 연안사주 군이 분포한 해역은 퇴적환경의 변화로 다대포-가덕도 사이의 바다가 육지로 바뀌게 될 것이다. 정부와 지방자치단체에서는 4대강 살리기, 대운하사업, 가덕도 근해에 신공항을 건설에 관심을 가지고 있어 이 방면에 대한 해안지형환경에 관한 세밀한 연구가 선행되어야 할 것이다.

• 한국수자원학회논문집
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• 제36권3호
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• pp.437-445
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• 2003

우리나라 남해안 지역은 다도해 지역이므로 대규모 지진해일이 발생하였을 때 섬과 섬 사이의 상호간섭으로 인한 예기치 않은 지진해일 피해가 우려될 수도 있다. 본 연구에서는 두개의 원형 섬 사이의 처오름높이 변화를 입사파 폭과 두 섬 사이의 거리와 같은 매개변수를 이용하여 계산하였다. 두 개의 원형섬 주위에서 입사파 수평길이가 두 섬의 양끝 바깥쪽 해저지름 거리보다 클 경우 두 섬 안쪽 부분에서 처오름높이가 급격히 증가하였으며, 두섬 사이의 간격이 줄어들수록 입사파의 처오름높이가 증가하였다.

• 한국재료학회지
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• 제16권3호
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• pp.151-156
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• 2006

A method for fabrication of nano-scale GaN structure by inductively coupled plasma etching is proposed, exploiting a thermal dewetting of Pt thin film as an etch mask. The nano-scale Pt metal islands were formed by the dewetting of 2-dimensional film on $SiO_2$ dielectric materials during rapid thermal annealing process. For the case of 30 nm thick Pt films, pattern formation and dewetting was initiated at temperatures greater $600^{\circ}C$. Controlling the annealing temperature and time as well as the thickness of the Pt metal film affected the size and density of Pt islands. The activation energy for the formation of Pt metal island was calculated to be 23.2 KJ/mole. The islands show good resistance to dry etching by a $CF_4$ based plasma for dielectric etching indicating that the metal islands produced by dewetting are suitable for use as an etch mask in the fabrication of nano-scale structures.

• 한국수산과학회지
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• 제42권6호
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• pp.650-656
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• 2009

Recently, bottlenose dolphins have frequently appeared in coastal waters of the Jeju Islands. To determine whether these individuals belong to one or more pods, the Cetacean Research Institute (CRI) established visual and photo-identification surveys in the Jeju Islands from November 2007 to July 2009. During visual surveys, pods composed of 10 to 80 individuals were sighted mainly in the northeastern and northwestern of Jeju Islands. Eighty-nine individuals were identified and cataloged by photo-identification using natural nicks and notches on their dorsal fins. Thirty-six individuals were identified three times or more, and nine individuals were identified five times during seven surveys. One individual appeared in November 2007, August 2008, October 2008, April 2009, and July 2009. The results of our study confirm that these dolphins represent a coastal resident stock. Futhermore, we will establish dolphin abundance, management, and usage studies using continuous visual and photo-identification surveys.

• 한국미생물·생명공학회지
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• 제37권3호
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• pp.189-196
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• 2009

Bacteria were isolated from roots of plants belonging to family Solanaceae and Gramineae, inhabited in Dokdo island. Fifty six endospore-forming bacteria grown on tryptic soy broth (TSB) agar medium and 23 nitrogen-fixing bacteria (NFB) grown on nitrogen free agar medium were isolated, respectively. The isolates were partially identified by analyzing the 16S rDNA and categorized into phylogenetic groups. The 16S rDNA sequences of each identified isolates were compared with sequences of each type strains to analyze phylogenetic relationship by phylogenetic tree. As a result, endospore-forming bacteria and nitrogen-fixing bacteria were classified into 4 and 6 lineage groups, respectively. Among these isolated, 18 were presumed to be novel species candidates based on the similarity (lower than 98%) analysis of the l6S rDNA sequences.

• 한국수소및신에너지학회논문집
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• 제14권4호
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• pp.348-358
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• 2003

According to Electricity Acceleration Law of Rural Area recently, the needs for replacement of a small scale diesel power generation facility which supplied electricity to 10-50 households Remote Islands has been revealed due to high operating and maintenance cost of Diesel Power Generation. Optimization of electric power system for Small Remote Islands must be made considering the economics, reliability and stability as power sources and estimation of total construction cost of those power stations. For its purpose, an assessment of power generation options such as Photovoltaic, Fuel cell, Wind-hybrid was implemented, economic evaluation of power supply shows the Photovoltaic, Fuel Cell for few household's islands and Diesel, Wind-hybrid for more inhabited islands. Power supplied by Diesel shows the best response to increasing electric demand and system reliability even with its lower economic value. Those who are in charge of power planning have to pay attention to system reliability, stability and operating characteristics of candidate's power supply besides its economics.

• Journal of Ecology and Environment
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• 제33권2호
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• pp.105-114
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• 2010

The principal objective of this study was to characterize the relationships between geographical conditions (e.g., island area, distance to mainland) and landscape structures of uninhabited islands, and to evaluate the effects of islands and their landscape structures on species richness. One hundred randomly selected islands and 5,000 m buffered areas derived from the boundaries of each island were used to summarize the number of observed bird species, and landscape pattern indices, particularly patch density, edge density, shape index, and mean nearest neighboring distance. Spatial arrangements of individual patch type at the class level, which are markedly affected by the distance from an island to the mainland, have a superior ability to explain the variances in species richness, as compared to the geographical conditions and landscape pattern indices at the landscape level. The results demonstrate that the patch type landscape structure is the primary factor affecting species richness, as well as the distance to the mainland. In particular, landscape pattern indices of cropland/pasture and woody cover are statistically significant in terms of explaining species richness, which suggests that food resources and appropriate conditions in landscape structures of habitat types are assumed as important elements in attracting bird species. This study also proposes the importance of evaluation on the landscape structure of each island, in order to designate protected areas and to establish a management plan for species conservation in uninhabited islands.

• Mycobiology
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• 제28권3호
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• pp.133-141
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• 2000

Twenty species representing five genera of arbuscular mycorrhizal fungi were isolated from twenty-four soil samples of the rhizosphere of the family Gramineae in Paekryung and Daecheong islands. A few species such as Glomus invermaius, G. marcrocapus var. marcrocarpus and Scutellospora coralloidea were recorded for the first time in Korea. The number of spores per 10g of soil was in the range of $8{\sim}337$ in Paekryung and $16{\sim}349$ in Daecheong island, respectively. The number of species per 10g of soil was $2{\sim}8$ species in Paekryung and $2{\sim}7$ species in Daecheong, respectively. Among them, G. macrocarpus var. macrocarpus was the most abundant species in both islands. The species diversity and evenness were almost similar in Paekryung and Daecheong Islands. Based on the host plants in two islands, the species diversity showed the highest value of 1.63 in Ischaemum crassipes, whereas the eveuness of species showed the lowest value of 0.35 in Eragrostis ferraginea.

• 한국균학회소식:학술대회논문집
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• 한국균학회 2014년도 추계학술대회 및 정기총회
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• pp.44-44
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• 2014

Yeasts were isolated from wild flowers of some islands and mountains such as Jeju-do, Ulleungdo, Yokjido, Seonyudo and Gyejoksan, Oseosan, Beakamsan and Deogyusan in Korea and were identified by comparison of nucleotide sequences for PCR-amplified D1/D2 region of 26S rDNA or internal transcribed pacer(ITS) 1 and 2 including 5.8S rDNA using BLAST. Seventy two yeast strains of two hundred eighty nine species were isolated from wild flowers in islands and mountains, Korea. Among them, Cryptococcus species were isolated the most dominantly, and Metschnikowia reukaufii were also isolated thirty species, 10.3% of total strains. Twenty-three species including Cryptococcus aureus were overlapped between yeast strains of the islands and mountains. Some physiological functionality of the culture broth and cell-free extracts from two hundred eighty nine yeast strains were determined. The supernatant of Candida sp. 78-J-2 showed antioxidant activity of 22.5%, and supernatant of Metschnilowia reukaufii SY44-6 showed anti-gout xanthine oxidase inhibitory activity of 49.6% and whitening tyrosinase inhibitory activity of 38.4%, respectively.