• 통합자연과학논문집
• /
• 제11권2호
• /
• pp.69-75
• /
• 2018

The red algae Gracilaria vermiculophylla is widely spread around seaside areas across the globe, and has been used as a food resource in Southeast Asian countries. Previous studies have shown that Gracilaria red algae extracts have beneficial antihypercholesterolemic, antioxidant, anti-inflammatory, and antimicrobial effects. In this study, we investigated the antioxidant effects of Gracilaria vermiculophylla extracts (GV-Ex) on human bone marrow mesenchymal stem cells (hBM-MSCs). The acetone and DMSO/ethanol solvents of the tested GV contain higher total flavonoid and polyphenolic contents that can strongly scavenge reactive oxygen species (ROS). Pre-treatment with GV-Ex protected hBM-MSCs against oxidative stress induced by hydrogen peroxide treatment. The protective effects of GV-Ex treatment were confirmed by MTT assay. The elevated levels of ROS in hBM-MSCs caused by hydrogen peroxide induced oxidative stress were significantly decreased by GV extract treatment. The levels of the antioxidant proteins superoxide dismutase 1 (SOD1), superoxide dismutase 2 (SOD2), and catalase (CAT) were also restored or protected by GV-Ex treatment, suggesting that GV extracts moderate excess ROS levels and prevent cells from oxidative damage.

• 화약ㆍ발파
• /
• 제19권1호
• /
• pp.71-84
• /
• 2001

Korean peninsula has the most mountainous areas such as mountains and hilly country, and it is surrounded by the sea on all sides but one. In this respect, a large scaled construction works have frequently been conducted. However, it is not easy to porform a large scale blasting work without giving any harm to houses or facilities nationwide. Therefore, blasting work becomes more closely related to maintenance thing due to the development of the downtown or a large structure for key facilities. Many researches on blast in the open space and tunnel blasting have been conducted. On the contrary, research on underwater blasting operations is comparatively scanty even though much more necessity of marine development is required. In this respect, this study aims to investigate the characteristics of underwater blasting operations and to make a comparative study with blast in the open space. As a result of examining into the characteristics during underwater blasting operations, the around oscillation in case of underwater blasting operations shows significantly low compared to that in case of blast in the open space, and this means that much more cautious altitude must be taken in designing underwater blasting operations compared to the design of blast In the open space. As a result of analysis on the difference between a square root and a cube root In the equation of estimating oscillations in the actual site, it is shown that it is shown to apply a square root for the estimation of oscillation at 60 meters in case of underwater blasting operations and at 22 meters case of general blast in the open space.

• 한국식물병리학회지
• /
• 제3권3호
• /
• pp.159-163
• /
• 1987

우리나라에 발생하고 있는 뿌리혹선충의 Race를 조사하고 기후에 따른 종의 분포 및 밀도를 파악하기 위하여 3226포장에서 시효를 채취하여 Baermann's funnel법으로 선충을 추출하여 선충의 형태와 International Meloidogyne Project의 Differenctial Host Test Method로 조사하였다. 우리나라에 있어서 뿌리혹선충의 종류별 분포는 M. hapla가 중부지방에서, M. incognita가 남부지방에서 우점종을 이루었고, M. arenaria는 남부지방에서 검출율이 다소 높았으며 M. javanica는 제주와 남부해안지방을 중심으로 분포하고 있었다. 우리나라에 분포하고 있는 뿌리혹선충의 종별 Race는 M. arenaria에서 Race 1과 Race 2, 그리고 M. incognita에서 Race 1, Race 2 및 Race 3이 알려졌으며, 이 중에 M. arenaria Race 1과 M. incognita Race 3은 우리나라에서 처음으로 보고되었다.

• 한국소음진동공학회논문집
• /
• 제26권1호
• /
• pp.49-54
• /
• 2016

The wind power plants were installed in many places because of the low climate changing effects since 2000. Generally, the wind power plants located in the seaside and the mountainous area and the heights of the windmills are about 40 m~140 m above the ground level. So the noises emitted from the wind power plants propagate far away compared with other environment noise sources like trains and cars noise. Because of these reasons, the noise emitted from the wind power plant is easy to cause the additional social problems like as noise complaints. Under the situation, the ministry of environment has established the guideline to evaluate the environmental effects for the wind power plant. According to the guideline, the noise of the wind power plant has to meet 55 dB(A) at daytime and 45 dB(A) at night in the residential area, which is regulated in the noise and vibration management law. But, it is difficult to estimate the noise emitted from the wind power plant because of the absence of the prediction model of the wind power plant noise. Therefore, the noise prediction model for wind power plants using the regression analysis method is developed in this study. For the development of the model, the sound pressure levels of the wind power plants in Jeju island are measured and the correlations between the sound pressure levels are analyzed. Finally, the prediction equation of the wind power plant noise using by regression analysis method derived. The prediction equation for the wind power plant noise proposed in this study can be useful to evaluate the environmental effects in any wind power plant development district.

• Journal of Radiation Protection and Research
• /
• 제20권4호
• /
• pp.285-296
• /
• 1995

각 원자력 발전소에서 발생되는 방사성폐기물을 한 곳에 모아 집중관리하기 위한 방사성폐기물 처분장의 부지선정이 국가적 과제로 부각되어 있으며, 충분한 검토를 거친 후 임해부지로 선정될 것이다. 이로 인하여 현재 각 원전부지내에 임시로 보관되어 있는 방사성폐기물에 대하여 전용선박에 의한 해상수송을 하여야 하면, 한국원자력연구소의 원자력환경관리센터(NEMAC)에서는 원전부지로부터 처 분장까지 안전하고 효율적으로 방사성폐기물을 수송할 수 있는 종합해상 수송체계를 개발중에 있다. 이 글은 해상수송체계가 갖추어야 할 수송선박의 기술기준을 설정하기 위한 것으로, 원자력 선진국의 진보된 방사성폐기물 해상수송기술에 관한 현황을 조사, 분석하고 국내의 제반여건을 고려하여 우리나라에서 사용될 수송선박의 설계 및 건조추진방향을 제시하였다. 따라서, 만일의 사고에도 방사성물질이 선박의 외부로 누출되지 않는 개념의 선박을 설계, 건조하여 방사성폐기물을 안전하게 해상수송하게 될 것이다.

• 한국수산과학회지
• /
• 제40권6호
• /
• pp.356-361
• /
• 2007

Recently, the development of various culture-independent identification techniques for environmental microbes has greatly enhanced our knowledge of microbial diversity. In particular, denaturing gradient gel electrophoresis (DGGE) of 16S rDNA fragments, generated using the polymerase chain reaction (PCR) is frequently used to examine the diversity of environmental bacterial populations. This method consists of direct extraction of the environmental DNA, amplification of the 200-600 bp 16S rDNA fragments with universal primers, and separation of the fragments according to their melting point on a denaturing gradient gel. In this study, we investigated the seaside microbial community in coastal areas of Busan, Korea, using culture-independent techniques. First, marine genomic DNA was extracted from seawater samples collected at Songjeong, Gwangahn, and Songdo Beaches. Then, PCR was used to amplify the bacterial 16S rDNA using universal primers, and DGGE was used to separate the amplified 500 bp 16S rDNA fragments. Finally, the tested 16S rDNA genes were further analyzed by sequencing. Based on these experiments, we found that DGGE analysis clearly showed variation among the regional groups. It can be used to monitor rapid changes in the bacterial diversity of various environments. In addition, the sequence analysis indicated the existence of many unculturable bacteria, in addition to Arcobacter, Pseudoaltermonas, and Vibrio species.

• 대기
• /
• 제27권1호
• /
• pp.93-104
• /
• 2017

The effect of Advanced Microwave Sounding Unit-A (AMSU-A) observations on the short-range forecast in East Asia (EA) was investigated for the Northern Hemispheric (NH) summer and winter months, using the Forecast Sensitivity to Observations (FSO) method. For both periods, the contribution of radiosonde (TEMP) to the EA forecast was largest, followed by AIRCRAFT, AMSU-A, Infrared Atmospheric Sounding Interferometer (IASI), and the atmospheric motion vector of Communication, Ocean and Meteorological Satellite (COMS) or Multi-functional Transport Satellite (MTSAT). The contribution of AMSU-A sensor was largely originated from the NOAA 19, NOAA 18, and MetOp-A (NOAA 19 and 18) satellites in the NH summer (winter). The contribution of AMSU-A sensor on the MetOp-A (NOAA 18 and 19) satellites was large at 00 and 12 UTC (06 and 18 UTC) analysis times, which was associated with the scanning track of four satellites. The MetOp-A provided the radiance data over the Korea Peninsula in the morning (08:00~11:30 LST), which was important to the morning forecast. In the NH summer, the channel 5 observations on MetOp-A, NOAA 18, 19 along the seaside (along the ridge of the subtropical high) increased (decreased) the forecast error slightly (largely). In the NH winter, the channel 8 observations on NOAA 18 (NOAA 15 and MetOp-A) over the Eastern China (Tibetan Plateau) decreased (increased) the forecast error. The FSO provides useful information on the effect of each AMSU-A sensor on the EA forecasts, which leads guidance to better use of AMSU-A observations for EA regional numerical weather prediction.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
• /
• 제16권11호
• /
• pp.1106-1110
• /
• 2010

본 논문은 자동화 컨테이너 터미널의 장치장에서 장치 위치 결정 전략을 다목적 진화 알고리즘(MOEA: Multi-Objective Evolutionary Algorithm)을 이용해 최적화하는 방안을 제안한다. 장치장의 해측과 육측 생산성은 서로 상충하기 때문에, 이 둘을 동시에 최대화하는 것은 불가능하다. 대신 본 논문에서는 MOEA를 이용해 파레토 최적해 집합(Pareto optimal set)을 구하였다. 초기 실험 결과 장치장의 컨테이너 점유율이 높은 어려운 문제의 경우, MOEA의 집단이 지역 해에 쉽게 빠지는 것을 확인하였다. 이에 본 논문에서는 난이도가 다른 두 개의 문제를 동시에 최적화함으로써 집단의 다양성을 유지하는 방안을 제안하였으며, 실험 결과 제안 방안이 단일 문제만 해결하는 방안에 비해 동일한 비용으로 더 좋은 전략을 얻을 수 있음을 확인하였다.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2002년도 추계공동학술대회논문집
• /
• pp.27-32
• /
• 2002

여러 자료에 따르면 우리나라에도 정확한 수는 알 수 없지만 상당량의 보물선이 침몰되어 있을 것으로 추정된다. 이에 최근 우리나라 영해에서 보물선 탐사작업이 활발히 이루어지고 있다 몇 건의 문화재 관련 발굴 사례 이외에는 아직까지 뚜렷한 성과가 없지만 앞으로 계속적인 발굴작업으로 인하여 보물선 발굴 사례의 가능성은 크다고 볼 수 있다. 이에 만약 침몰선을 인양했을 경우에 발생되는 법적인 문제들과 그 절차들, 그리고 침몰선의 소유권과 관련한 국내법적 문제 및 해결방법들과 국제법적 문제 및 해결방법들에 대해서 살펴보고 현재 존재하는 법시스템의 몇가지 문제점을 제시하고자 한다.

• 로봇학회논문지
• /
• 제8권1호
• /
• pp.51-57
• /
• 2013

Recently, the number of jellyfish has been rapidly grown because of the global warming, the increase of marine structures, pollution, and etc. The increased jellyfish is a threat to the marine ecosystem and induces a huge damage to fishery industries, seaside power plants, and beach industries. To overcome this problem, a manual jellyfish dissecting device and pump system for jellyfish removal have been developed by researchers. However, the systems need too many human operators and their benefit to cost is not so good. Thus, in this paper, the design, implementation, and experiments of autonomous jellyfish removal robot system, named JEROS, have been presented. The JEROS consists of an unmanned surface vehicle (USV), a device for jellyfish removal, an electrical control system, an autonomous navigation system, and a vision-based jellyfish detection system. The USV was designed as a twin hull-type ship, and a jellyfish removal device consists of a net for gathering jellyfish and a blades-equipped propeller for dissecting jellyfish. The autonomous navigation system starts by generating an efficient path for jellyfish removal when the location of jellyfish is received from a remote server or recognized by a vision system. The location of JEROS is estimated by IMU (Inertial Measurement Unit) and GPS, and jellyfish is eliminated while tracking the path. The performance of the vision-based jellyfish recognition, navigation, and jellyfish removal was demonstrated through field tests in the Masan and Jindong harbors in the southern coast of Korea.