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나영우,송용희,권오섭,최병길 한국측량학회 2014 한국측량학회 학술대회자료집 Vol.2014 No.4
To suggest the improvement plans for making small scale maps with higher accuracy and usability, the projection and coordinate systems used to make small scale maps similar to those of Korea in foreign countries that have the topography or latitude similar to that of Korea were analyzed. Based on the results of the analysis, the problems with the existing small scale maps have been derived and the optimization plans through the improvement of the projection of coordinate system and neat line formation were suggested for achieving high accuracy and usability. To suggest application methods, the accuracy of individual projection including cylindrical projection, conical projection and planar projection, etc. and the optimal projective methods and coordinate systems that could be applied to small scale maps were selected by analyzing the amount of distortion with Tissot indexes according to the accumulation factor of cylindrical projection. Furthermore the advantages and disadvantages of longitude and latitude coordinates and of rectangular plane coordinate neat line formation and coordinate marking methods were analyzed, and thereby the improvement plans for coordinate system considering usability and compatability as small scale maps were suggested.
최병길,나영우,신영섭 한국측량학회 2017 한국측량학회지 Vol.35 No.4
This paper aims to study a method to estimate precise carbon absorption by quantification of forest information that uses accurate LiDAR data, hyperspectral image. To estimate precise carbon absorption value by using spatial data, a problem was found out of carbon absorption value estimation method with statistical method, which is already existed method, and then offered optimized carbon absorption estimation method with spatial information by analyzing with methods of compare digital aerial photogrammetry and LiDAR data. It turned out possible Precise classification and quantification in case of using LiDAR and hyperspectral image. Various classification of tree species was possible with use of LiDAR and hyperspectral image. Classification of hyperspectral image was matched in general with field survey and Mahalanobis distance classification method. Precise forest resources could be extracted using high density LiDAR data. Compared with existing method, 19.7% in forest area, 19.2% in total carbon absorption, 0.9% in absorption per unit area of difference created, and improvement was found out to be estimated precisely in international code.
황토-마그네시아 복합체 활용 Living Concrete의 품질특성에 관한 실험적 연구
최연왕,나영우,권용우 한국건설순환자원학회 2022 한국건설순환자원학회 논문집 Vol.10 No.4
본 연구에서는 Living Concrete의 품질특성 평가결과 유동성은 황토 혼합율 증가에 따라 테이블 플로우가 감소하는 경향이 나타났으며, 압축강도는 황토 혼합율 증가에 따라 감소하는 것으로 나타났다. 경량화를 위하여 밀도 특성 평가를 실시하였으며, 비교군으로시멘트를 사용한 패널과 비교한 결과 시멘트 패널의 밀도에 비해 약 20 % 낮은 밀도가 측정되어 하중에 영향을 적게 받아 구조물에설치가 가능할 것으로 판단된다. 패널온도 저감성을 평가한 결과 시간에 따른 온도 저감의 차이가 나타났으며, 이끼가 착근된패널이 이끼가 착근되지 않은 패널보다 온도의 저감이 나타나 수직형 녹화시스템에 활용이 가능할 것으로 판단된다.