• 한국초등과학교육학회지:초등과학교육
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• 제21권2호
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• pp.241-252
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• 2002

Field learning have not well performed in elementary school for various reasons, in spite of the benefits of field study. Absence of suitable geological field courses for elementary science education is one of several reasons The purpose of this study is to develop learning materials for the field geology in Hampyeong region and apply them to the geological related units for elementary science education. The 5 observation sites for the field geology learning in study area include various rocks and geological structure such as granite, gneiss, conglomerate, sandstone, mudstone, plant fossil, fold, fault and weathering phenomenon changing rocks to soil. This study area is suitable place for the field geology learning of elementary science education in Kwangju and Chonnam province because of convenience access, fresh outcrops and distribution of various geological learning materials as rocks and structure.

• Geomechanics and Engineering
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• 제22권1호
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• pp.1-9
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• 2020

This paper presents an investigation of the ground response of a gob-side gateroad suffering mining stress induced by a 21 m-thick coal seam extraction. A field observation, including entry convergence and stress changes monitoring, was first conducted in the tailgate 8209. The observation results of entry convergence showed that, during the adjacent panel 8210 retreating period, the deformation of the gob-side gateroad experienced a continuous increase stage, subsequently, an accelerating increase stage, and finally, a slow increase stage. However, strong ground response, including roof bending deflection, rib extrusion and floor heave, occurred during the current panel 8209 retreating period, and the maximum floor heave reached 1530 mm. The stress changes within coal mass of the two ribs demonstrated that the gateroad was always located in the stress concentrated area, which responsible for the strong response of the tailgate 8209. Subsequently, a hydraulic fracture technique was proposed to pre-fracture the two hard roofs above the tailgate 8209, thus decreasing the induced disturbance on the tailgate. The validity of the above roof treatment was verified via field application. The finding of this study could be a reference for understanding the stability control of the gob-side gateroad in extra thick coal seams mining.

• 한국지구과학회지
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• 제26권1호
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• pp.66-77
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• 2005

한반도 남서해안에 위치한 흑산도 고층관측이 2003년 6월 1일부터 실시되고 있다. 이러한 흑산도 관측자료에 의한 수치예보개선효과를 보기 위하여 광주의 관측자료와 비교 분석하였다. 분석에는 MM5를 기본으로 제작한 호남지방 고밀도 예측시스템을 이용하였다. 먼저 지표면 마찰과 현열플러스의 차이에 의하여 광주와 흑산도의 바람장과 온도장은 다르게 나타났으며, 광주와 흑산도의 자료를 모두 동화시킨 수치예측 바람장과 기상장이 관측과 제일 잘 일치하였다. 강수면에서 비록 강수량은 과소평가를 하고 있으나, 강수시간과 강수구역은 흑산도자료를 포함하여 자료동화를 시킨 경우 관측과 유사하게 나타났다.

• Journal of Astronomy and Space Sciences
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• 제32권3호
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• pp.201-207
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• 2015

An algorithm to automatically extract coordinate and time information from optical observation data of geostationary orbit satellites (GEO satellites) or geosynchronous orbit satellites (GOS satellites) is developed. The optical wide-field patrol system is capable of automatic observation using a pre-arranged schedule. Therefore, if this type of automatic analysis algorithm is available, daily unmanned monitoring of GEO satellites can be possible. For data acquisition for development, the COMS1 satellite was observed with 1-s exposure time and 1-m interval. The images were grouped and processed in terms of "action", and each action was composed of six or nine successive images. First, a reference image with the best quality in one action was selected. Next, the rest of the images in the action were geometrically transformed to fit in the horizontal coordinate system (expressed in azimuthal angle and elevation) of the reference image. Then, these images were median-combined to retain only the possible non-moving GEO candidates. By reverting the coordinate transformation of the positions of these GEO satellite candidates, the final coordinates could be calculated.

• 한국정보통신학회논문지
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• 제8권3호
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• pp.645-653
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• 2004

수중 어류의 행동이나 현상을 예측하여 시각화하기 위해서는 어류의 탐지와 어류반응행동의 파악이 우선 이루어져야 한다. 수중이라는 다변적인 환경요인이 현장 계측을 매우 어렵게 하거나 어류의 행동이 비선형적으로 복잡하고 혼돈스러우므로 기존의 단순한 그래픽처리는 실제 수중현상간의 차이를 극복하지 못해왔던 실정이다. 이에 본 논문에서는 매우 복잡 다양한 어류행동반응의 패턴에 대하여 기존의 연구에서 제안된 혼돈이론을 응용한 어류반응행동 모델을 이용하여 시각화 도구를 제안함으로써 수중의 어류이동현상을 예측하거나 평가, 또는 보다 더 정확히 분석하는 자료를 얻을 수 있게 구현하였다. 아울러, 어탐 디스플레이를 동시에 적용하여 사용자에게 반응에 따르는 어류의 탐지상황도 제공하였다. 제안된 시각화 도구를 평가하기 위하여 현장 계측된 어류의 이동 정보와 비교한 결과, 제안된 시각화 도구는 사실성 높은 어류 행동과 시각적인 이해도를 높일 수 있음을 확인 할 수 있었다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권1호
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• pp.166-174
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• 2009

Gijang Sea is located on the southeastern coast of Korea. This study establishes a basic system to identify optimal sites for the wave power generation. To achieve this goal, the field measurements were made at the field site in front of Dong-am fishing port at Gijang. In addition, we analyzed the offshore wave data at the Donghae buoy operated by Korea Meteorological Administration(KMA) and compared the data with the wave characteristics in Gijang Sea. The main results were as follows. In winter, the wave direction in Gijang Sea ranged between east and south($90{\sim}180^{\circ}$). The main wave direction was east($90^{\circ}$). The Significant wave heights and periods were under 2 m and $5{\sim}15$ sec, respectively. A comparison of water depth and wave direction constitutes one(condition) of the important parameters for selecting the optimal site for the wave power generation.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 추계학술대회 논문집(제1권)
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• pp.175-180
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• 2006

본 연구는 제주도 서측 해역의 현지 파랑관측 자료를 기초로 해양파의 비선형 특성을 조사한 것으로서, 실제 해역에서의 Freak wave 예보의 토대를 마련하기 위한 기초 연구이다. 관측된 파랑자료의 비선형 특성을 조사하기 위해 파형의 상하 비대칭성, 전후비대칭성, 빈도 분포의 첨예도, 파랑 스펙트럼의 대역폭 파라미터 등을 추출하고 이를 자료를 유의파고, 최대파고 등의 파랑 특성치들과의 상관관계를 분석하였다.

• 한국지반공학회논문집
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• 제26권7호
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• pp.135-145
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• 2010

최근까지 국내에서는 팽이기초에 관한 연구가 미흡하였고, 지반조건에 맞는 설계기준이 마련되어 있지 못하여 일본의 설계기준을 그대로 사용하고 있는 실정이다. 이로 인해 기존 팽이기초의 지지력식은 과소하게 예측되는 문제점이 있다. 따라서 본 연구에서는 실제크기의 1/5 스케일로 축소한 모형실험을 수행하였으며, 국내에서 이루어 진 100여개 현장의 재하실험 결과를 근거로 강도특성(N값), 지하수영향, 팽이기초의 파괴형상을 고려하여 보다 합리적으로 팽이기초의 지지력을 예측할 수 있는 식을 제안하였다.

• 천문학회보
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• 제46권2호
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• pp.76.1-76.1
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• 2021

Maemi Dual Field Telescope System (MDFTS) is a dual telescope system located at Kyung Hee University. The system consists of 0.4 m telescope and 0.1 m telescope for wide-field observation. The 0.4 m telescope provides photometric observation which covers a field of view of 21'×16'. It has been used for various purposes with Johnson-Cousins UBVRI broadband filter system, e.g., SomangNet and Intensive Monitoring Survey of Nearby Galaxies. In this poster, we present the standard calibration result for our broadband filter system. Also, we suggest a new usage of the KHAO 0.4m telescope which is narrowband photometry by demonstrating the standard calibration of H-alpha filter. For flux calibration, not only R filter but also V filter is used for compensating the central wavelength discrepancy between R filter and H-alpha filter.

• 천문학회보
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• 제46권2호
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• pp.71.3-72
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• 2021

The Intensive Monitoring Survey of Nearby Galaxies (IMSNG) is a high cadence observation program monitoring nearby galaxies at < 50 Mpc with high probabilities of hosting supernovae (SNe). The current number of main IMSNG targets is 60, but with new wide-field facilities joining IMSNG, there is a possibility of increasing the likelihood of catching the early light curves of SNe among galaxies in the vicinity of the main targets. To test the feasibility of the expansion of the sample galaxies, we examine how much the probability of catching SNe increases by adjusting the field of view of the RASA36 telescope which is one of the IMSNG facilities with a large field of view of 6.25 deg2. We calculate supernova rates (SNRs) of galaxies within the FoV that contains main IMSNG galaxies from the stellar mass and star formation rate of the galaxies. Based on the SNRs of these galaxies, we find the best pointing of the telescope towards the highest SNR region. As a result, we present improved total SNR, with respect to the ordinary pointing on average where the IMSNG main target is placed at the center of FoV. The actual observation should be followed to test the effect of this strategy.