• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.444-444
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• 2023

하천 및 저수지와 같은 공간의 수체 탐지는 수자원 관리에서 매우 중요하며, 유역의 수문학적 과정을 이해하는데 도움을 준다. 수문학적 데이터 수집은 우량계, 수위계와 같은 물리적 인프라의 배치가 필요하다. 그러나 상대적으로 저개발된 국가는 수문학적 측정을 위한 인프라가 매우 미흡한 것이 현실이며, 북한과 같은 비접근 지역에 대한 수문학적 과정을 분석하는데는 한계가 있다. 인공위성 원격탐사 센서 중 SAR영상은 지표면에 직접 전파를 방사하고 산란되어 돌아오는 신호를 수신하여 영상을 만들기 때문에 일반적인 광학영상과는 달리 햇빛의 유무와 강우, 구름여부 등의 기상 조건의 영향을 거의 받지 않는 장점이 있다. 또한 국내와 같이 계절적인 요인과 인간활동에 의해 변화되는 물 순환을 SAR 영상은 지표수의 계절적 및 연간 변동성을 모니터링하는데 매우 유용한 자료로 평가되고 있다. 본 연구는 SAR영상을 이용하여 국내의 검증 가능한 지역의 저수지 수면적 변화를 모니터링하고 저수지 수면적과 저수량 분석을 수행하는 것을 목적으로 하였다. 분석자료인 SAR영상은 ESA의 Sentinel-1영상을 2022년 4월부터 2022년 11월의 자료를 수집하여 소양강댐 저수지 수면적과 저수량과의 관계식을 도출하였다. 수체 추출을 위한 SAR 영상은 특히 수로의 일부 가장자리와 홍수터의 식물 존재로 인한 제외지의 매핑에 부정확성을 포함하여 처리에 몇 가지 단점을 갖는 한계도 존재하지만 악천후의 기상 조건에서도 작동할 수 있는 SAR 영상의 능력 덕분에 규칙적인 시간 간격으로 수체면적의 변화에 대한 정보를 제공할 수 있다. 향후 북한 지역의 주요 댐 저수지 수면적에 대한 연간변화와 장기간의 추세를 분석하는 연구를 진행할 계획이다.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.4
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• pp.29-37
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• 2010

The change detection of XML documents is a major research area. However, though XML becomes a file format for Hangul documents, research on change detection of Hangul documents based on the characteristics of Hangul documents is rather scarce. Since format data in Hangul documents are very large, which is different from ordinary XML documents, it is not proper to apply general XML change detection algorithms such as X-treeDiff+ to Hangul documents without any change. In this paper, we propose new contents-based matching algorithm and implement it in X-treeDiff+. The result of our testing shows better performance for most documents in editing process.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.381-381
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• 2022

본 연구에서는 실시간적으로 계측, 수집된 자료를 이용하여 도시지역 물순환 전 과정에 대한 개별 물리모델 구동을 실시하고, 수자원의 양적인 흐름을 연계하여 표출하는 도시 수자원 사이버 물리시스템(CPS) 시뮬레이터에 활용되는 입력인자 변동성 분석을 실시하였다. 도시 수자원 실시간 CPS 시뮬레이터의 시나리오 분석을 위한 변동입력인자는 취수량, 타 배수지 구역 공급량, 대상지역 수용가 사용량 변화, 오수전환률 및 오수배출 지연시간 등으로 설정하였으며, 변동입력인자 변화모의를 위한 발현가능한 시나리오를 구축하고, 분석결과를 정량화하여 제시하였다. 본 연구에서 활용된 발현가능한 시나리오는 가뭄 등 취수제한상황에 따른 양적인 공급 흐름모의, 수용가 물 사용 패턴 변화(예, 코로나로 인한 비대면 재택 근무 증가 등)에 의한 상수, 오수변화량 모의 등으로 설정되었다. 분석 결과 다양한 입력인자의 변화에 따른 도시수자원 흐름변화에 영향을 주는 구성요소의 파악과 정성, 정량적 영향을 직관적, 정량적으로 평가할 수 있음을 확인하였다. 도출된 변동성 평가 결과는 설정된 시나리오가 현실화될 경우 효과성 높은 대응책을 마련하는데 활용이 가능하다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.32-32
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• 2022

본 연구는 농경지가 주로 분포되어있는 영산강 유역(3,371.4 km²)을 대상으로 농업용수 건전성 및 취약성 평가를 수행하였다. 먼저, 농업용수 건전성은 관개 기간에 농업용수 확보를 위한 유역 환경 요소(하천, 토지이용, 수문, 수질, 수생태, 서식지)로 정의하였으며, 취약성은 용수공급에 영향을 주는 인위적인 변화 요소(기후변화, 불투수층 변화, 농업용수 수요량 변화, 토지피복 변화)로 구분하였다. 각 요소의 sub-index는 1개의 지수로 정규화하여 평가하였으며 Percentile rank 방법으로 계산하였다. 분석결과 영산강 하류의 나주시(5004) 유역의 건전성 및 취약성 지수가 각각 0.33, 0.92로 농업용수 공급에 취약한 것으로 분석되었다. 이에 따른 회복력 및 유지·조치 우선순위 분석결과 또한 농업용 수리시설(저수지, 양수장, 취입보, 집수암거, 관정)을 이용한 농업용수 확보가 시급한 것으로 분석되었다. 최종적으로 본 연구에서 제시한 농업용수 건전성 및 취약성 지수는 장기간에 걸친 유역 변화분석이 가능하고, 농업용수 공급 상황을 예측함으로써 향후 농업용수 확보를 위한 시설물 설치계획 수립에 근거자료로 활용할 수 있을 것으로 판단된다.

• Radiation Oncology Journal
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• v.24 no.4
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• pp.309-316
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• 2006

$\underline{Purpose}$: To analyze the recent citation trend and to find a way to improve impact factor (IF) of the Journal of Korean Therapeutic Radiology and Oncology (JKSTRO) by analysis of Korean Medical Citation Index (KoMCI) citation data of JKSTRO and comparison with that of mean citation data of all journals enlisted on KoMCI (KoMCI journals) during 2000-2005. $\underline{Materials\;and\;Methods}$: All citation data of entire journals enlisted on KoMCI and JKSTRO from 2000 to 2005 were obtained from KoMCI. The trend of total and annual number of published articles and reference citations, total citations and self-citations per paper, IF and impact factor excluding self-citations (ZIF) were described and compared on both KoMCI journals and JKSTRO. $\underline{Results}$: Annual number of published articles was decreased for 6 years on both KoMCI journals and JKSTRO (32% and 38% reduction rate). The number of Korean journal references per article is 1.6 papers on JKSTRO comparing to 2.0 papers on KoMCI journals. The percentage of Korean references/total references increased from 5.0% in 2000 to 7.7% in 2005 on JKSTRO and from 8.5% in 2000 to 10.1% on KoMCI journals. The number of total citations received/paper on JKSTRO (average 1.333) is smaller than that of KoMCI journals (average 1.694), there was an increased rate of 67% in 2005 comparing to 2000. The percentage of self-citations/total citations (average 72%) on JKSTRO is slightly higher than that of KoMCI journals (average 61%). IF of JKSTRO was gradually improved and 0.144, 0.125, 0.088, 0.107, 0.187, and 0.203 in 2000-2005 respectively. However, ZIF of JKSTRO is steadily decreased from 0.038 in 2000 to 0.013 in 2005 except 0.044 in 2004. $\underline{Conclusion}$: IF of JKSTRO was slightly improved but had some innate problem of smaller number of citations received. To make JKSTRO as a highly cited journal, the awareness of academic status of JKSTRO and active participation of every member of JKSTRO including encouraging self-citations of papers published recent 2 years and submission of English written papers, and active academic cooperation with related academic societies.

• Journal of Forest and Environmental Science
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• v.14 no.1
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• pp.89-100
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• 1998

The study was carried to investigate the change of internal stress and physical properties of paper by the mutiplying of paper structuring that is an useful means to maximize the performance and use of the fiber raw material. The effects of recycled fiber on the physical properties of multiplied paper also were studied. The beating increased the internal stress of single layered paper, while filler loading decreased the internal stress. Multiplying the structure of paper decreased the internal stress and the most of physical properties except for tear index. It was found that the properties of paper could be changed by the pulp type, beating and the combination of raw materials. The introduction of filler in the middle and/or outer layer could improved the internal stress, tensile index, tear index and burst index. The addition of recycled fiber increased the opacity and stiffness of paper in both single layered and multiplied paper. Multiplying the structure of paper improved the air permeability and stiffness, while decreased burst index.

• Journal of Wetlands Research
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• v.15 no.4
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• pp.567-572
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• 2013

Mammals act as an important role in maintaining ecosystem, but direct observation is very difficult. Nevertheless, in order to understand the impact of various changes about a sudden environment, long-term monitoring through direct investigation is essential. This study investigated home range analysis using GPS tracking device and behavioral ecology of Korean waterdeer (Hydropotes inermis), indigenous and native species in Korea. Studies on ecological characteristics and home range of Korean waterdeer are insufficient. Therefore, we studied home range using the GPS technique for critical point of existing research. Data showed the active movement in daytime ($44.1km^2$) than night ($30.0km^2$) and large area of activity in winter ($3.7km^2$) and spring ($44.1km^2$) than summer($0.04km^2$) and autumn ($0.01km^2$). The most used area of Korean waterdeer was forested area and wetland, agricultural area, waters in order of frequency based on the land coverage map. Our research represents overall characteristics of Korean water deer due to measurement of area of activity. However, this research signified behavioral ecology for Korean waterdeer, and further investigation in necessary.

• Journal of Cadastre & Land InformatiX
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• v.46 no.2
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• pp.137-153
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• 2016

The price of agricultural products has changed from year to year, the m ajor c ause o f price fluctuation is the imbalance of supply and demand. Materials which are mainly used in korean cabbage production volume is the forecast model, using the cadastral result, slope calculation is impossible to achieved. For this reason, this implies the drastic decrease of prices and the prediction of supply and demand of field crops that is cultivated in a highland slope area, this situation is being repeated. Therefore, the target area of this research is the slopes of high land, by using 2D and 3D Lidar data for the analysis of the cultivated area. Experiment was carried out in the same area to compare the data differences. The rate of change in the area of slope is quantitatively increasing presented by the regression model. An alternative methodology that can improve the reliability of the calculated slope area using 2D is through cadastral map.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.4
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• pp.557-562
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• 2018

High molecular weight sodium alginate (HMWSA)/low molecular weight sodium alginate (LMWSA) microcapsules containing phytoncide oil were prepared with different LMWSA contents. The effects of the stirring rate and ratio of HMWSA/LMWSA on the diameter and morphology of the phytoncide/alginate beads were investigated by optical microscopy and the release behaviors of phytoncide oil from the phytoncide/alginate beads were characterized by UV/Vis. spectrophotometry. The mean particle size of the phytoncide/alginate beads decreased with increasing stirring rate and concentration of the calcium chloride solution. The surface morphology of the phytoncide/alginate beads changed from smooth surfaces to skin-like rough surfaces with increasing LMWSA content. These results were due mainly to the increased hydrophilic groups at the bead surface, resulting in an increase in the release rate of phytoncide oil in the phytoncide/alginate beads.

• Journal of Korea Soil Environment Society
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• v.3 no.3
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• pp.75-86
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• 1998

This paper is going to show the way we can sample the landfill gases flowing out to the air through final cover soil by using an closed chamber in the field for a short time. In addition, we came to the following results through the application of model with actual measurements. 1) Analyzing changes of concentration in the chamber(H: 10-30cm) every 5 minutes, considering analysis time of gas chromatograph for an half hour. 2) The proportion of $CE_4$to $CO_2$changes rapidly near the surface of final cover soil by the influence of methane oxidation reaction. 3) When flux of landfill gas is F=$10^{-5}$mol/$\textrm{m}^2$.s), methane oxidation reaction has an influence on composition of gases, however there is little influence when F=$10^{-6}$ mol/($\textrm{m}^2$.s).