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- 학과정보 : 건설공학과(산업) 토목공학전공 (검색결과 3 건)
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촬영방향 및 전처리 방법에 따른 고정익 UAV기반 정사영상 및 DSM의 품질평가
UAV(Unmanned Aerial Vehicle) can efficiently acquire orthoimage and DSM(Digital Surface Model) based on point clouds at low cost by digital image processing. However, the quality of the orthoimage and DSM depends on various flight conditions and data processing methods, such as overlaps, flight directions, and interpolation algorithms for rasterization of point cloud data. This study provides a comparative quality evaluation of orthoimage and DSM according to flight directions and pre-processing methods. Aerial photos based on a fixed-wing UAV corresponding to two types of flight direction are analyzed. The quality of the orthoimage and DSM is compared through applying two types of interpolation and pre-processing methods to the point clouds. The experiments indicate that the IDW(Inverse Distance Weighting) method is more efficient than the TIN(Triangulated Irregular Network) method for DSM interpolation. A sharpening filter gives high performance when generating objects, such as buildings and trees, in complex areas.
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김현교 충북대학교 산업대학원 2025 국내석사
Due to the recent climate change, damages such as river levees and reservoir overflows, flooding of agricultural land, and landslides caused by typhoons and local heavy rains have frequently occurred. According to the 2022 Statistical Yearbook of Agricultural Production Base Maintenance (2023), 14,877 out of about 17,066 agricultural reservoirs have been built for more than over 50 years old, and it is unlikely to respond to rainfall events caused by recent abnormal climates. Four reservoirs with at least 30 years old of weather observation data were selected among small reservoirs located in Chungcheongbuk-do, and since there are differences in the observation timing of weather data for each observatory, this study selected a period from 1973 to 2023 (51 years) to compare and analyze the results during the same period. To calculate the design flood amounts, the K-HAS (KRC Hydrology & Hydrology Analysis System) provided by the Korea Rural Community Corporation (KRC) was utilized. Flood amounts were calculated, and reservoirs were tracked using this system. The appropriateness of the target reservoirs was examined based on changes in design flood amounts and reservoir tracking results according to the set period. As a result of analyzing the design flood increase/decrease rate by collecting meteorological data on the target reservoir of this study from 1973 to 2023 and classifying CASE into four categories, the largest increase rate was found in Satteo Reservoir Case 3 (-4.33%), Sojuk Reservoir Case 3 (23.77%), Neolakgol Reservoir Case 4 (15.18%), and Gojabae Reservoir Case 4 (72.58%). It can be seen that the rainfall is gradually increasing even considering the regional specificity. In addition, as a result of examining whether the height of the dam cest for each reservoir is adequate by performing flood tracking of the reservoir based on the design flood calculated to examine the hydrological stability of the target reservoir, it was confirmed that the dam cest height of the Satteo Reservoir Case 3 (-0.50m), Sojuk Reservoir Case 2 (-1.06m), Neolakgol Reservoir Case 4 (-0.53m), and Gojabae Reservoir Case 4 (-0.92m) were found to be the most insufficient. In all this study, the lack of height of the reservoir embankment due to changes in design standards and the increased precipitation is confirmed, and accordingly, measures and operational management measures need to be established to improve the hydrological stability of small reservoirs. Key words: Probability rainfall, aging reservoir, K-HAS, flood volume, dam cest, freeboard * A thesis for the degree of Master of Engineering in February 2025.
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구체 방수재 혼입 콘크리트의 역학적 특성 및 방수 성능 평가
서민석 충북대학교 산업대학원 2026 국내석사
This paper presents the experimental results for evaluating the mechanical performance, durability, and waterproof performance of concrete in which a hydrophobic admixture was incorporated to secure waterproof performance. For the study, a total of five mixtures were designed with variables of 0%, 2%, 4%, 6%, and 8% of admixture content by cement weight. For each mixture, the slump and air content of fresh concrete were measured to confirm the basic properties, and for hardened concrete, compressive strength and flexural strength tests were conducted to analyze the changes in mechanical properties. For the evaluation of durability, sulfuric acid immersion tests were performed, and the mass loss rate and surface deterioration were observed. In addition, water penetration depth was evaluated by applying 0.5 MPa water pressure for 72 hours. The compressive strength showed a tendency to slightly decrease in long-term ages as the admixture content increased, but even at a maximum of 8% content, the decrease in strength was less than 10%. In the case of flexural strength, a similar tendency was shown, and the 28-day flexural strength of the mixture without admixture was 5.56 MPa, while about 5.07 MPa at 8% content, showing a decrease of 9.5%. In the sulfuric acid immersion test, the mass loss rate of the specimens with admixture was relatively higher during the initial one week, but as the immersion period progressed, the loss rate was reduced as the admixture content increased. After four weeks of immersion, the mass loss rate was 18.69% for the specimen without admixture, whereas it was reduced to 17.47% for the specimen with 8% content. As a result of the water permeability test, the average penetration depth of the specimen without admixture was 15.33 mm, while it was reduced by 54% to 7.00 mm at 2% content, and reduced by 76% to 3.74 mm at 6% content. In particular, in the specimen with 8% content, no water penetration occurred even when 0.5 MPa water pressure was applied for 72 hours.
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