• 환경생물
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• 제33권2호
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• pp.177-181
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• 2015

Two marine isopods, Pentias hayi Richardson, 1904 and P. thompsoni Collinge, 1916 were verified as unrecorded species in South Korea. The genus Pentias is reported for the first time in South Korea. These two isopods were collected from Heuksan-do Island and Ulleung-do Island from South Korea, respectively. We provide descriptions of the diagnostic characteristics, illustrations of two species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.606-607
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• 2007

This paper is about optimal flywheel capacity estimation for Ullueng-do power system. The power system of Ullueng-do has some differences with other island power system in Korea. It includes wind generator, hydro-generators as well as diesel generators. There are some problems on 600kW wind generator. Because of frequent drop of wind generator, the Ulleung-do power system have been threatened on frequency. The power frequency is 60Hz, and it should be between 59.9 and 60.1Hz. However, since the electrical inertia is small and the weight of wind generation is relatively high, generator drop of wind generation might make the power frequency out of boundary. In this paper, the flywheel energy storage system is assumed to be installed on Ulleung-do power system. Then, the maximum wind generation capacity and the optimal superconducting flywheel energy storage system capacity is estimated by the transient stability simulations.

• 한국자원식물학회지
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• 제25권6호
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• pp.719-730
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• 2012

This study was conducted to investigate the environmental characteristics of natural habitats, and the genetic variations in samples from 19 different quadrates of Asplenium scolopendrium 10 habitats. The natural habitats of A. scolopendrium were located at an altitudes 110-973 m with inclinations of $7-30^{\circ}$. All the quadrates were located on north facing slopes. The average field capacity of the soil is 31.4%, with organic matter at 16.7%, and the pH is 5.84. The soil texture was confirmed as sandy loam in 8 habitats and silt loam in 2 habitats. A total of 214 vascular plants were identified from 10 habitats. The importance value of the herbaceous layer (H) was the highest in A. scolopendrium, at 10.4%, followed by Arachniodes standishii (7.3%), Dryopteris crassirhizoma (6.5%), and Polystichum tripteron (5.3%), which implies that the natural habitats of A. scolopendrium are affinity with ferns. The species diversity of A. scolopendrium was estimated as on average 1.09, while the dominance and evenness were 0.12 and 0.87, respectively. The result of the RAPD analysis, among 59 bands amplified with a primer, 25 (42.4%) showed polymorphism. Twenty-one individuals of 10 habitats could be classified into four groups with similarity coefficient values ranging from 0.74 to 1.0. Mt. Mullae and Geumdaebong populations shows basal branching within the 21 individuals. Ulleung-do island and Jeju-do island population forms an independent clade, respectively. Mt. Moak and Byeonsan-bando clade formed a sister to the Ulleung-do island and Jeju-do island clade.

• 전기학회논문지
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• 제59권12호
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• pp.2190-2194
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• 2010

Wind power generation system (WPGS) of Ulleung Island causes frequency and voltage fluctuation due to wind speed variation during night time. Superconducting magnetic energy storage (SMES) system can overcome the fluctuations through the fast response time of energy charging and discharging. The SMES system should be connected to the terminal of the WPGS for frequency stabilization. To demonstrated the effectiveness of SMES system for power quality improvement, Ulleung Island power network was modeled in a real time digital simulator (RTDS). The RTDS-based simulation results of power quality improvement with SMES are investigated and discussed in detail.

• 한국지하수토양환경학회지:지하수토양환경
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• 제23권6호
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• pp.37-45
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• 2018

The source of Chusan Spring water in the Ulleungdo is the precipitation in the Nari caldera basin, which permeates in the Trachitic pumice and tuff area and moves downward, outflowing at the lithologic boundary between the trachyte and Nari tuff. It is known that the discharge rate of the Chusan Spring is large enough to be used for the small hydroelectric power generation, but the exact discharge rate and hydrogeologic characteristics have not been known. The discharge rates of the Spring were measured 11 times, which ranged from $15,220m^3/d$ to $36,278m^3/d$. The discharge rates, measured by the automatic level recorder, for two-year period, were $20,000{\sim}38,000m^3/d$. The variation of discharge rates did not coincide with rainfall event, but showed daily increases of $3,000{\sim}5,000m^3/d$. The annual discharge rate excluding the evapotranspiration and the surrounding stream discharge corresponded to 70.6% of the annual precipitation of the recharge area. Therefore, meteorological observations at the Nari basin, rather than the Ulleung-do meteorological station, are more appropriate to properly interpret the discharge characteristics of the Chusam Spring and the recharge rate of the basin.

• 한국주거학회논문집
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• 제15권5호
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• pp.107-118
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• 2004

The purpose of this study is to analyze the unique characteristics of the vernacular house of Ulleung-Do(island), which shows a different residential culture from the main land. For this purpose, this study examined the characteristics of the location, spatial arrangement, and floor-plan of the house and also tried to understand how these basic elements were changed and why these changes were occurred. The result of this study is as follows: First, the house was located on the mountain area and was oriented toward the various bearings. Second, the house usually did not have annexes and most residential space was installed on a main building. Third, the floor-plan of the house was developed from a basic two-Kan (with single row) house type in a early settlement period to three-Kan, four-Kan, and five-Kan house types in later periods. While the development of house type proceeded. the main building was functioned as a complex space for both residential and storage purposes. Some houses were gradually developed into a middle and upper-class house shape by installing annexes. The change of the floor-plan and the house size was the result of self-sustained living culture influenced by the natural environment of the island and of changes of residential conditions as well.

• Journal of Microbiology and Biotechnology
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• 제33권2호
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• pp.188-194
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• 2023

Microbacterium elymi KUDC0405^T was isolated from the rhizosphere of Elymus tsukushiensis from the Dokdo Islands. The KUDC0405^T strain was Gram-stain-positive, non-spore forming, non-motile, and facultatively anaerobic bacteria. Strain KUDC0405^T was a rod-shaped bacterium with size dimensions of 0.3-0.4 × 0.7-0.8 ㎛. Based on 16S rRNA gene sequences, KUDC0405^T was most closely related to Microbacterium bovistercoris NEAU-LLE^T (97.8%) and Microbacterium pseudoresistens CC-5209^T (97.6%). The dDDH (digital DNA-DNA hybridization) values between KUDC0405^T and M. bovistercoris NEAU-LLE^T and M. pseudoresistens CC-5209^T were below 17.3% and 17.5%, respectively. The ANI (average nucleotide identity) values among strains KUDC0405^T, M. bovistercoris NEAU-LLE^T, and M. pseudoresistens CC-5209^T were 86.6% and 80.7%, respectively. The AAI (average amino acid identity) values were 64.66% and 64.97%, respectively, between KUDC0405^T and its closest related type strains. The genome contained 3,596 CDCs, three rRNAs, 46 tRNAs, and three non-coding RNAs (ncRNAs). The genomic DNA GC content was 70.4%. The polar lipids included diphosphatydilglycerol, glycolipid, phosphatydilglycerol, and unknown phospholipid, and the major fatty acids were anteiso-C_17:0 and iso-C_16:0. Strain KUDC0405^T contained MK-12 as the major menaquinone. Based on genotypic, phylogenetic, and phenotypic properties, strain KUDC0405^T should be considered a novel species within the genus Microbacterium, for which we propose the name M. elymi sp. nov., and the type strain as KUDC0405^T (=KCTC 49411^T, =CGMCC1.18472^T).

• 한국해양학회지:바다
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• 제11권1호
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• pp.21-30
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• 2006

본 연구는 2003년 10월부터 2005년 8월까지의 ARGO 뜰개에 의해 수집된 CTD 자료를 이용하여 울릉도 주변 해역의 수온-염분의 시공간 변동 양상을 분석하였다. 울릉도 주변 해역 상층 700m에서의 수괴는 5종류로 세분할 수 있으며, 가을 표층에는 여름의 고온저염수에 비해 더 저온저염화 된 수괴가 존재한다. 염분최소층을 갖는 동해중층수는 평균적으로 수심 265 m에 존재하며, 수온은 $1\~5^{\circ}C$염분 34.06 psu이하이고 평균 두께는 175m이다. 동해중층수의 두께는 시공간적으로 크게 변하지 않지만, 울릉난수성 소용돌이가 존재하는 경우 동해중층수의 위치 수심은 더 깊어지고, 이 영향으로 상부동해고유수의 수심 또한 저층으로 침강하게 된다. 본 자료에 의하면, 울릉난수성 소용돌이가 갖는 볼록렌즈 모양의 수온 구조는 700m수심까지 존재한다. ARGO 뜰개들이 수집한 약 2년의 측정 기간과 짧은 시간 간격의 수직 수온-염분 프로파일 자료는 연구 해역의 상세 수직 구조 및 단기 시간-공간 변동성을 이해하는데 대단히 유용하였다.

• 한국지역지리학회지
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• 제7권3호
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• pp.14-28
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• 2001

본 연구는 경상북도 울릉도 자연환경자원보호구역에서의 난개발의 문제점과 개선방안을 제시하는 것이다. 울릉도 자연환경자원 보전구역에서 발생되는 난개발 형태는 국토이용변경, 일주도로의 개설, 항만건설에 따른 석산개발, 관광지 지정조성 및 군사시설 설치 등이다. 문제점으로는 첫째, 국토이용변경으로 인한 동식물의 서식영역 감소와 식수원 오염이다. 둘째, 일주도로개설로 인한 자연생태계파괴이다. 셋째, 항만건설과 석산개발로 인한 자연경관 훼손 및 해양생태계 변화이다. 넷째, 관광지 지정조성과 군대시설 설치에 따른 회귀한 식물의 훼손과 식수원 오염이다. 개선되어야 할 점으로는 첫째, 국토이용변경으로 인하여 회귀한 식물이 훼손되지 않도록 친환경적으로 개발한다. 둘째, 도로 시설, 항만을 설치할 때는 환경영향평가를 실시하여 자연경관 및 환경자원의 훼손을 최소화하도록 한다. 셋째, 도서지역 개발에 소요되는 석재 등은 전부 육지에서 반입하도록 하고 도서지역의 열악한 재정을 감안하여 그 소요예산은 전적으로 국가에서 부담하여야 한다. 넷째, 관광지 지정조성에 대해서는 이미 조성된 지역은 계획적으로 관리하며, 미 조성된 지역은 자연환경보전지역으로 재조정하도록 한다. 다섯째, 군대시설을 설치할 경우, 당해 자치단체와 반드시 협의하여 설치하도록 한다. 다섯째, 공무원 및 해당 주민들의 자연환경자원보전 및 보호하고자하는 의식이 필요하다 마지막으로 지역주민들에 대한 재정적인 지원이다.

• 지구물리와물리탐사
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• 제19권3호
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• pp.121-130
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• 2016

다양한 지름의 암석코어에 대해 비교적 간편하고 정확하게 열전도도를 측정할 수 있는 divided bar형 열전도도 측정 시스템인 PEDB (potable electronic divided bar system)를 도입 이용하여 열전도도 측정시 고려해야 할 요소에 대해 검토하였다. 또한, 지열조사를 위해 울릉도에서 채취한 70개의 코어시료에 대해 적용하고 그 특성을 살펴보았다. 열전도도 측정에 있어서 실내온도의 변화가 가장 큰 영향을 미치므로 되도록 실내온도의 변화가 적거나 항온 환경에서 측정하는 것이 바람직하다. 열원(heat source)의 온도, 안정된 상태에서 평균하는 온도의 구간 등에 의한 영향은 실내온도 변화에 비해 미미하다. 열접촉 보조제인 바셀린을 사용하면 시편의 열전도도가 다소 높게 평가되고 특히 접촉면이 고르지 않은 암석시편에서는 그 차이가 더 크게 나타난다. 하나의 시편에 대해 반복 측정할 때, 실내온도가 $1^{\circ}C$ 이내로 유지된다면 표준시편에서는 ${\pm}0.3%$ 이내, 암석시편에서는 ${\pm}4%$ 이내의 좋은 반복성을 얻을 수 있다. 울릉도의 두 지열 조사공에서 얻은 암석코어의 열전도도는 심도 증가에 따라서 대체로 열전도도가 커지는 경향이 있으나 암종 변화와 특별한 상관성을 보이지는 않았다.