• Proceedings of the Korea Air Pollution Research Association Conference
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• 2006.04a
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• pp.410-411
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• 2006

• Proceedings of the Korean Vacuum Society Conference
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• 2007.08a
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• pp.101-101
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• 2007

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2019.08a
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• pp.239-239
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• 2019

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2019.08a
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• pp.126-127
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• 2019

• Water for future
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• v.56 no.1
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• pp.50-58
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• 2023

• Journal of the Economic Geographical Society of Korea
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• v.18 no.1
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• pp.87-102
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• 2015

This study attempts to introduce the methodology for accounting real-time population distribution in the urban areas. For the purpose, we utilize the media user's time-space information from the media users' media diaries in the media panel survey databases. We analyze the space-time population rate for each activity space related with everyday urban lifes. Seoul has been selected as a case study area, since space-time information are relatively rich there, and thus the comparisons are available. The space-time population rates have been verified by the comparative analysis with the T-card results. We propose a real time population measurement method by combination of the space-time population rate with geographical data. The real time population of each activity space at each dong in Seoul has been calculated by multiplying the space-time population rates to the numbers of employer of three categories of activity spaces(residential, working, and commercial). By utilizing GIS, we visualize the results of two time points (3AM and 3PM) and then analyze the spacio-temporal characteristics of real time population distribution in Seoul. The Day time population distribution pattern shows strong relationships with the distribution of business and commercial activities, while the night time population distribution pattern can be explained by resident population distribution almost perfectly.

• Journal of the Korean Geographical Society
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• v.47 no.2
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• pp.193-207
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• 2012

This study discussed characteristics of Shindu Coastal Dune as habitat, and relationship between geodiversity and biodiversity. It was identified spatio-temporal variation of incoming nutrients depended on geomorphic differences of foredunes. The main incoming path of nutrients into coastal dune was considered as influx with movement of wind blown sands from the beach and tidal f lat. Concentrations of Na, Mg, K, Ca, and P in blown sands were compared. Concentrations of Na, Mg, and K showed high and irregular pattern in favorable condition of influx of blown sand. So these nutrients were related with geomorphic characteristics of foredunes. However, Na was also influenced by other factor such as salt spray. P was independent from effects of sea water and blown sands. In the case of Ca, a large coastal dune system rather than localized forms of foredunes made differences in the variation. Due to differences in spatio-temporal variation of nutrients, patterns of major vegetation could be inferred to appear differently. This study shows geomorphic dynamics of coastal dunes as habitat, and will provide information for coastal dune management and for understanding biological distribution and growth pattern in coastal dune.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.3B
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• pp.285-293
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• 2010

Soil moisture is a key factor to control the exchange of water and energy between the surface and the atmosphere. In recent, many researches for spatial and temporal variability analyses of soil moisture have been conducted. In this study, we analyzed the spatio-temporal variability of soil moisture in Walnut Gulch Experimental Watershed, Arizona, U.S. during the Soil Moisture Experiment 2004 (SMEX04). The spatio-temporal variability analyses were performed to understand sensitivity of five observation sites with precipitation and relationship between mean soil moisture, and its standard deviation and coefficient of variation at the sites, respectively. It was identified that log-normal distribution was superior to replicate soil moisture spatial patterns. In addition, precipitation was identified as a key physical factor to understand spatio-temporal variability of soil moisure based on the temporal stability analysis. Based on current results, higher spatial variability was also observed which was agreed with the results of previous studies. The results from this study should be essential for improvement of the remotely sensed soil moisture retrieval algorithm.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.419-424
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• 2006

대청호로 유입하는 탁수의 감시와 저수지내의 시공간분포를 예측할 수 있는 실시간 탁수감시 및 예측시스템(RTMMS)을 개발하였다. RTMMS는 탁도와 수온 등 실시간 계측자료를 데이터베이스에 저장.조회하는 실시간 감시(Realtime Monitoring), 2차원 탁수예측 수치모델의 입력자료 생성(Input Data), 탁수예측 수치모델의 수행 (W2 Run), 모의결과의 조회 및 저수지 운영 시나리오별 탁수조절 효과분석을 위한 후처리 (Post-Process) 기능을 제공한다. 시스템의 GUI 화면은 개별 기능을 탭 형식으로 제공하여 사용자가 순차적으로 자료조회와 모델수행 그리고 결과분석을 쉽게 수행할 수 있도록 설계하였다. RTMMS는 강우사상 동안 유입하천의 수온예측을 위해 대기기온, 이슬점온도, 하천유량자료를 독립변수로 이용하는 다중회귀모델(DMR)을 사용하며, 탁도 예측은 유량과 SS 부하량의 상관관계를 이용하는 탁도예측모델(QLM)을 사용한다. 저수지로 유입한 탁수의 밀도류 거동과 시공간적인 탁도분포 예측은 2차원 횡방향 평균 수리 수질해석 모형인 CE-QUAL-W2를 채택하였다. 개발된 시스템은 2004년 홍수기를 대상으로 시범적용 하였으며, 그 결과를 실측자료와 비교하여 제시하였다. RTMMS는 저수지 탁수발생 현황조회, 취수원 도달시간 및 지속기간, 밀도류와 전도현상을 고려한 시공간 분포 예측, 발전 및 수문방류, 선택취수 등 다양한 저수지운영 시나리오에 따른 상.하류 영향 분석, 용수 이용자에게 탁도 예측정보의 제공 등 탁수를 고려한 저수지운영 의사결정지원 도구로써 매우 유용하게 활용 될 것으로 기대된다.

• Journal of Korea Water Resources Association
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• v.38 no.1
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• pp.73-82
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• 2005

A soil moisture measuring method of a hillslope for Korean watershed is developed to configure spatial-temporal distribution of soil moisture. Intensive surveying of topography had been performed to make a digital elevation model(DEM). Flow distribution algorithms were applied and a distribution pattern of the measurement sensors was determined to maximize representative features of spatial variation of soil moisture. Inverse surveying provides appropriate information to install the waveguides in the field. Measurements were performed at the right side hillslope of Bumrunsa located at the Sulmachun watershed. A multiplex monitoring system has been established and spatial-temporal variation of soil moisture data has been measured for a rainfall-runoff event. Acquired soil moisture data show that physical hydrologic interpretations as well as the effectiveness of monitoring system. Lack of connectivity in vertical distribution of soil moisture suggests that preferential flow and macropore flux are important components in the hillslope hydrology.