• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.78-81
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• 2003

The present study illustrates a method for monitoring the urban vegetation around Shaoxing city, Monitoring spatiotemporal changes in urban areas will become increasingly important as the number and proportion of urban residents continues to increase. The synoptic view of urban land cover provided by satellite and airborne sensors is an important complement to in situ measurements of physical, environmental and socioeconomic variables in urban settings. The results obtained have revealed a notable change in the vegetation cover in and around the City premises. In this study, we discussed methodology for measurement of urban vegetation and vegetation distributions based on band ratioing in Shaoxing city using Land sat TM imageries. A systematic analysis of the spatiotemporal dynamics of vegetation in urban areas is required to ensure a healthy sustainable environment.

• 환경영향평가
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• 제6권1호
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• pp.55-66
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• 1997

This study summarizes the use of satellite data to detect the change of southwestern coastal wetlands in Korea. The images used for this study were two Landsat Thematic Mapper(TM) images (June 12, 1984 & June 2, 1992). TM images were used to classify such different types of wetlands as aquatic bed, nonaquatic bed and other land use in the region. Then it, was possible to a) determine the status of wetlands using image classification products, and b) detect the changes of various types of wetlands influenced by both human and nature. The results from spatiotemporal analysis showed that approximately 120 lad of coastal wetlands were lost from the year of 1984 to 1992. 71 % of the lost wetlands were converted to the reclaimed land. This loss of wetlands has been causing the profound environmental impacts. It has been successfully proved that satellite data are very effective for spatiatemporal change analysis, especially for that of coastal wetlands.

• 한국물환경학회지
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• 제38권1호
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• pp.1-9
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• 2022

The Yeongsan River, one of the four major rivers in Korea, shows the highest degree of water pollution compared to the other major rivers. The construction and opening of two weirs, Seungchon and Juksan, induced fluctuations in the hydrologic conditions and water quality of the river. To investigate the water quality changes caused by the opening of the weir in 2017, this study analyzed the water quality data using the non-parametric Wilcoxon signed-rank test and the three-dimensional spatiotemporal plots. The non-parametric statistical test results showed that the concentration of all parameters has increased after 2017 at a significance level of 0.05. For the parameters that showed the highest degree of change, chlorophyll-a and suspended solids, the median values have increased by more than 30% after weir opening. Visual analysis additionally showed the spatial changes in the Yeongsan River. Generally, the sites above the Seungchon weir showed higher pollution levels than those above the Juksan weir. In time series, visual analysis results also showed the trend of rising concentration for all water quality parameters, indicating that the opening of two weirs had a significant effect on the change in water quality of the Yeongsan River.

• 환경영향평가
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• 제18권3호
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• pp.161-170
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• 2009

As urban growth continues, the earth ecosystem is increasingly dependent on the patterns of urban growth. The impact intensity from urban growth is expected to change predictably with distance from the urban center. However we can't fully understand yet how urban development pattern affects urban ecosystem. In researches about urban ecosystem, it is important to relate the spatial pattern of urbanization to ecological processes. So we used gradient analysis with time data; 1980's, 1990's and 2000's. We attempted to quantify the urban spatiotemporal impacts in Daejeon-city and Cheonan-city, Korea, along a 75km long and 3km wide transect. Through the results, we found the impacts range of urbanization with urban development process of two cities. When the urban growth was concentrated on in both cities, the impacts intensity and range were much stronger and wider. As a result, in urban planning or green space planning, we have to consider suitable urban development forms with surrounding areas, and make legal clauses which limits landuse change. This quantifying the urban gradient is an important step in understanding urban ecology.

• 환경영향평가
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• 제18권6호
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• pp.321-330
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• 2009

Spatiotemporal changes in the thermal environment in a large city, Seoul, Korea were analyzed using a thermal index, perceived temperature (PT), to standardize the weather conditions. PT is a standard index for the thermal balance of human beings in thermophysiological environment. For the analysis of PT, the data from long-term monitoring and intensive observations in and around the inner-city stream called 'Cheonggye' in Seoul, were compared with a reference data from the Seoul weather station. Long-term data were monitored by installing two automatic weather stations at 66m (S1) and 173m (S2) away from the center of the stream. Through the analysis of the data during the summer of 2006 and intensive observation periods, it was revealed that the stream's effects on the PT extended up to the distance of the S1 site. In winter, the increase of the PT between pre- and post-restoration was stronger at S1, which was nearer than S2 from the stream. These results suggest that PT can be used as an effective model in analyzing the changes of the thermal environment in relation with the changes of water surface areas.

• 한국습지학회지
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• 제14권2호
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• pp.303-315
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• 2012

본 연구는 낙동강 하구 일대 습지의 생태계 특성과 변화를 파악하기 위해 습지목록을 제작하였다. 목록의 기초자료로 Landsat TM(1986년 4월 1일, 1987년 6월 23일, 1997년 6월 18일), Kompsat-2 (2008년 1월 12일) 인공위성 이미지, 항공 LiDAR (2009년 3월 1일) 자료와, 부산시에서 조사한 생물 모니터링 자료를 바탕으로 DB를 구축하였다. 습지목록의 활용방안으로, 시계열별 습지분류도 제작 및 시공간 분석, 경관 패턴 분석, 저서생물 분포 특성 등을 파악해 습지 생태계 관리에 도움이 되도록 하였으며 특히 3차원으로 제작된 습지지도는 습지의 경계설정과 습지의 동적 특성분석에 도움을 주어 이러한 기법들을 잘 활용한다면 우리나라 전역의 습지목록 개발에 이용될 수 있다.

• Advances in nano research
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• 제12권3호
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• pp.319-336
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• 2022

Evaluating the temporal and spatial changes in the ecosystem service value (ESV) of the Sanjiangyuan Nature Reserve is important for understanding the impact of human activities on natural ecosystem and guiding ecosystem restoration and environmental pollution control. In this study, remotely sensed land-cover data and the equivalent factor method were used to analyze the spatiotemporal evolution characteristics of the ESV in Sanjiangyuan Nature Reserve from 1992 to 2015, and regression analysis was employed to determine the factors driving changes in the ESV. The results show that grassland was the main type of ecosystem in the study area, and the transformation of grassland into bare areas was the primary change in land cover. Additionally, the ESV in the study area first decreased and then increased, with an annual growth rate of 0.69%. The ESV mainly increased in the north of the Yellow River's source area, and mainly decreased in the northwest of the Yangtze River's source area. Finally, the gross output value of agriculture, urbanization rate and proportion of secondary industry were found to be the main factors driving the ESV in the study area.

• 해양환경안전학회지
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• 제27권7호
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• pp.1004-1010
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• 2021

선박의 해양사고 중 부유물 감김사고는 운항지연에 그치지 않고 대형 인명 피해사고까지 이어질 수 있어 이에 대한 예방책이 요구되고 있다. 이에 본 연구는 영해와 베타적경제수역 등을 포함한 해역의 최근 5년간 선박의 부유물 감김사고 데이터를 시·공간적 측면에서 분석하고, 관련 연구 분야에 기초 자료를 제공하고자 한다. 부유물 감김사고의 상대적 밀도 분포를 시각화하기 위하여 이차원 평활 히스토그램을 적용하였으며, 시간대, 주·야간, 계절에 따른 각 변수가 감김사고에 미치는 영향을 분석하기 위해 다항 로지스틱 회귀모형을 적용하였다. 공간적 분석결과 전체 사고에 대해 평활화된 밀도 값이 높은 곳은 진해만을 포함한 거제도~통영 해상이었으며, 서해 전곡항 인근 해상, 제주도 북부 해상으로 나타났다. 시간적 분석결과 부유물 감김사고는 주간에 71.4%로 가장 많이 발생하였으며, 계절별로는 가을철이 다른 계절에 비해 가장 많이 발생한 것으로 분석되었다. 또한, 어선, 수상레저기구, 낚시어선의 감김사고 발생 가능성이 화물선 보다 높은 것으로 조사되었다. 본 연구의 시·공간적 분석결과는 향후 부유물에 대한 단속강화 및 제거를 위한 해양경찰함정 배치와 시간별·계절별 사고방지를 위한 부유물 사전 제거작업 대책 마련의 기초자료로 활용될 것으로 기대된다.

• The Journal of Korean Physical Therapy
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• 제26권1호
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• pp.1-8
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• 2014

Purpose: The aim of the present study was to understand the relationship between gait symmetry and functional balance, walking performance in stroke patients and to makes recommendation regarding the most suitable measure for standardization of expression of spatiotemporal gait symmetry. Methods: 45 subjects with stroke (31 men, 14 women, $57.3{\pm}10.3$ years old) participated in this study. Gait symmetry was calculated by equations of symmetry ratio (SR) and symmetry criterion (SC) for stance time, swing time, single leg support time (SLST), step length, and stride length. Spatiotemporal parameters were measured respectively by walkway system ($GAITRite^{TM}$ system). Limit of stability (LOS) by using forceplate (Balance Performance Monitor) during voluntary weight displacement and Berg Balance Scale (BBS) were measured as functional balance and Timed Up and Go test (TUG) and Functional Ambulation Category (FAC) were assessed as functional walking. Results: SR in stance time and swing time was correlation with BBS, TUG and FAC (p<0.05). SR in SLST only with BBS (p<0.01), SR in step length only with FAC (p<0.05). SC in stance time was correlation with BBS and TUG (p<0.05). SC in swing time and SLST with BBS, TUG and FAC (p<0.01), SC in step length with TUG and FAC (p<0.01), SC in stride length with BBS and FAC (p<0.01). Conclusion: Gait symmetry in spatiotemporal gait parameters provides meaningful information about functional balance and walking performance in stroke subjects. Our analysis may support the recommendations of the symmetry criterion as equation for standardization of gait symmetry.

• 한국지리정보학회지
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• 제8권1호
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• pp.13-22
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• 2005

본 논문은 무감독 ISODATA 기법을 이용하여 Landsat TM 위성영상에 기반한 새만금 간석지의 지형을 분류하고, 이 분류된 지형의 시공간적 변화를 분석하고자 한다. 각각의 퇴적 지형은 새만금 방조제 공사 진행에 따른 상이한 특성을 나타내며, 퇴적 변화와 분포를 입증한다. Landsat TM 7개의 band 중에서 밴드 4가 간석지와 해수면의 구분, 그리고 밴드 5는 간석지에 대한 세부적인 지형의 분류에 이용한다. 각 지역의 지형적 특성을 구분함으로써 간석지의 지형변화에 따른 검토는 간척 계획수립과 간척된 이후의 토지 이용에 매우 유용할 것으로 사료된다.