• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.320-320
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• 2011

하천 유사량은 유량과 마찬가지로 충적 하천의 기본적인 자료로서 하상변동 예측, 저수지 퇴사량 추정, 유사 유출량 추정, 하도 계획과 설계, 유사조절 계획 수립 등에 다목적으로 활용된다. 선진 외국의 경우는 유사량관측망을 구축하여 일찍이 유역관리 및 하천관리, 하천시설물관리 및 댐 관리 등을 위한 자료를 생산하고 있으나, 국내의 경우는 유사량 측정 기반 및 실측된 유사량 자료가 부족한 관계로 단순한 가정이나 경험식에 의한 추정치들의 활용 빈도가 높다. 본 연구에서는 국내 특성에 맞는 관측망을 구축하기 위해서 국내외 관측망 구축 사례 등을 조사 분석하였으며, 이를 토대로 유사량관측망 구축 방법을 개념화하였다. 개념화된 유사량 관측망 구축방법은 유역관리, 하천관리, 하천시설물 관리, 댐 관리 측면을 포괄하는 방법으로 관련계획 및 설계기준 검토, 유사량조사 현황 검토, 설계대상 수위관측소 선정, 현장조사 등의 과정을 필요로 한다. 본 연구에서는 관측망 구축대상 지점을 국가수위관측망(643개소)로 하였으며, 이를 통해 총 138개소의 유사량관측망을 목적별로 구축하였다. 권역별로는 한강권역 44개소, 낙동강 권역 37개소, 금강 권역 33개소, 섬진강 권역 12개소, 영산강 권역 12개소로 구축되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.702-702
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• 2012

이상기후로 인하여 최근 급증하는 자연재해에 대한 대비가 요구되며, 2010년 광화문 침수 및 2011년 서울 강남지역의 침수 등과 같이 이에 대한 대비가 시급한 현안으로 부각되고 있다. 그러나 이는 기존의 치수대비 개념으로 접근하여 인명 및 재산 등에 초점이 맞춰져 있어, 건축문화재에 대한 대비는 충분하게 고려되고 있지 않다. 본 연구에서는 건축문화재의 홍수 위험도 평가를 위한 기초 연구로서 서울의 대표적인 건축문화재인 창경궁의 홍수 위험도 평가 모형을 구축하였으며, 모형 구축을 위해 현장 실측 유량 자료와 서울 기상청(종로구 송월동)의 강우자료(2011년 6월-8월의 8개 사상) 활용을 통해 홍수 위험도 평가 모형(HEC-HMS)의 매개변수 최적화를 수행하였다. 그리고 구축된 창경궁 지역의 평가 모형 검증을 위해 2011년 7월 26-28일까지 모의한 홍수량을 지형정보시스템(GIS)에 적용하여 침수 지도를 작성하였으며, 작성된 침수 지도를 현장에서 조사한 침수 흔적과 비교 검토하였다. 그 결과, 침수 면적이 약 10%의 오차를 보였으며, 수행한 모의가 우수한 결과를 나타내었음을 확인할 수 있었다. 이는 본 연구에서 구축한 홍수 위험도 평가 모형이 대상유역에 적합하며, 향후 홍수 위험도 평가를 위해 활용이 가능할 것이라 사료된다.

• Journal of the Korean GEO-environmental Society
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• v.12 no.4
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• pp.33-41
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• 2011

In case of building up port facilities on soft ground, unsymmetrical surcharge of embankment, which make the excess pore water pressure to increase, causes to occur lateral displacement due to plasticity of soil. A study on lateral displacement and settlement of the caisson, which is installed on improved ground, was accomplished. The field measurement data and calculated values obtained from FEM program of Plaxis were compared and analyzed. For numerical analysis, the properties of soils, constructions stage and time were considered. Lateral displacement was measured at the point of inclinometers installed in front of caisson. Settlement was measured at the center of extra embankment behind of caisson. Comparison of measured and calculated for lateral displacement showed that the calculated value was greater than the measured, and increasing trend was different. The calculated value showed step increasing as step extra embankment applied, whereas the measured gradually was increased. For settlement of embankment, the amount of both measured and calculated were similar, but the trend was different like that of lateral movement.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2006.05a
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• pp.116-121
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• 2006

광범위한 지역의 자연환경 정보를 파악하기 위하여 위성 영상자료를 이용하는 것이 적합하지만 선행되어야 할 것은 이러한 위성영상자료를 이용하기 위한 지상에서의 내부 실험과 현장실험을 통한 기초적인 모델식을 만드는 것이 중요하다. 이를 위하여 위성영상자료와 실측수질인자들의 상관관계를 조사하는 것이 보다 정확하고 객관적인 평가 방법이 될 수 있다. 따라서 대기의 영향이 없는 실험실내에서 순수한 담수와 해수를 이용하여 Landsat ETM 영상자료의 어느 밴드가 클로로필a 농도파악에 적합한가를 평가하고자 하였다. 그 결과 밴드조합 중 가장 높은 상관관계를 보인 최적밴드는 담수에서 (83-B4)/B2이고, 해수에서는 (82+B4)/B3로 이 때의 상관계수가 각각 0.9747, 0.9892이므로 향후 이 밴드를 조합하여 위성영상 평가 시 사용하는 것이 유효할 것으로 생각된다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.424-427
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• 2012

본 연구에서는 최근 증가하고 있는 대심도역사의 제연팬 용량에 따른 연기확산영향에 대하여 분석하였다. 시뮬레이션모델은 신금호 역사(5호선, 깊이 46m)를 대상으로 하였으며, 제연팬 용량에 따른 연기확산 영향을 분석 하였다. 현장조사 및 실측을 통하여 계측된 실제 역사의 제연팬에 관한 데이터를 화재시뮬레이션 조건으로 적용하였다. 역사전체를 해석 대상으로 하여 총 400만개의 격자를 사용하였으며, 제연팬 용량에 따른 연기확산 영향 비교를 위하여 화재 시나리오를 작성하여 Case별로 화재해석을 수행하였다. 계산 효율을 높이기 위하여 MPI병렬처리기법을 사용하였으며 해석코드는 LES(large eddy simulation) 기법을 주로 사용하는 FDS5 code를 사용하였다.

• 한국태양에너지학회:학술대회논문집
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• 2011.11a
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• pp.130-133
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• 2011

This paper reports the Survey results from a field monitoring study of office occupancy densities. The field measurement of a office in Yongin was carried out from 19 September to 30 September 2011. The survey has an aim to reveal the building energy consumption relationship between occupancy densities of a realistic office and the previous studies. The results showed that hourly occupied density of the previous studies is more higher than a field survey. we investigated the effects of difference occupancy densities on annual heating and cooling energy consumption using EnergyPlus. Heating and cooling consumption was raised because of the increased occupancy density. therefore, accurately measure the occupnacy schedule is important in order to reduce excessive building energy consumption, and is an significant element to be considered in the energy simulation.

• Journal of the Korean Association of Geographic Information Studies
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• v.22 no.2
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• pp.15-23
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• 2019

When the public surveying system was introduced in 1961, large scale surveying performances, such as infrastructure construction work, were dominant. However, due to changes in the environment, most of the current surveying performances focused on small scale underground facilities. The method of surveying underground facilities is as follows: "method of measurement before refilling after burying the pipeline" and "method of using exploration after refilling." There are advantages and disadvantages to each method. It became difficult to obtain the accuracy of the location of the underground facilities due to the fact that there were sections of the pipeline that had not been observed through exploration. Therefore, the 2017 performance evaluation regulations were revised. The revision included the addition of the "Underground Facilities Creation Period," a system that allows for surveys to be evaluated based on actual measurements. However, in this particular field, concerns about the advantages of exploration and the purpose of this study was to investigate the background and purpose of the limitations of the survey have been continuously raised. The purpose of this study was to investigate the background and purpose of the public surveying system and to identify the proportion of underground facilities surveying in comparison to public surveying. This study conducted surveys on the implementers of public surveying and those who did the actual surveying. The researcher has summarized the improvements that incorporate the analysis results and the field comments in the revised performance evaluation regulations in 2017.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.1
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• pp.29-36
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• 2020

This study was conducted to suggest the new grassland grade system on evaluating the grassland status. The grassland status has been evaluated based on the forage yield (good, fair and poor) by municipal authorities. The grassland grades by current system were 19 good, 11 fair and 11 poor among the 41 grassland farms from 6 provinces. This evaluation result differed greatly from the result of actual measurement of forage yields which showed all poor. The big difference was resulted from failing the reflection of the various characteristics, such as different seasonal growth and harvest frequency. Furthermore, the lack of consistent examining date and method added the inaccuracy of current grassland grade system. The new grassland grade system based on the grassland vegetation ratio (grass, weed and bare soil) was initially designed into 6-grade system (1st; 100~80%, 2nd; 79~60%, 3rd; 59~40%, 4th; 39~20%; 5th; 19~1% and 6th; 0% on the basis of grasses proportion), but later was changed into 4-grade system (1st, 2nd, 3rd, and 4th grades are 70% or more, 50% or more, 50% or less, and 0% of forage proportion, respectively) after reflecting the opinion of grassland farms and municipal authorities. Re-evaluation on the grassland status using the 4-grade system resulted in the total 80% consisted of 2nd, 3rd and 4th grade which means most grasslands needs the partial reseeding or the rehabilitation of entire grassland. Pictures and schematic diagrams depicting the 4-grade system were presented to improve the objectivity of evaluation. The optimal time for assessing grassland status is fall when plant height 20~30 cm. Conclusively, the 4-grade system is an efficient method for all non-professionals including grassland farms or municipal authorities in assessing the grassland status. To apply this system to the field, the institutional arrangements such as amendment of grassland act should take place in advance.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.255-261
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• 2004

Through spot-investigation and observation of water quality environment of Jinhae Bay, this conducts the sea movement simulation on the current water quality of Jinhae Bay, grasps the flowing characteristics of Jinhae Bay and carries out ocean pollution simulation by using the data collected. Sea movement simulation results are tested by using Ocean Investigation Bureau's data of tide and current, and are also used in the ocean pollution spreading simulation. Water quality spreading simulation is conducted by using the data of sea movement and data of observation and then the results are compared with data of spot investigation. COD condensity is calculated and the water quality characteristics of Jinhae Bay are grasped.

• Journal of Digital Contents Society
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• v.16 no.5
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• pp.835-847
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• 2015

Photo scanning can create point cloud and polygon models like 3D scanners bringing an object into the 3 dimensional world by combining several sheets of photographic information. The created data give us information about planes and sectional forms required for a 2 dimensional survey as well as 3 dimensional figures of buried cultural property. It requires a lot of time to record buried cultural property in the field, however, the photo scanning technique does not need additional equipment and manpower so the work may begin immediately while the property is protected. Moreover, it reduces financial burdens as it creates 3 dimensional data using images acquired by photography but provides the optimal condition to check 3 dimensional information quickly and easily.