• Title/Summary/Keyword: DAR(1)

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Object Detection of AGV in Manufacturing Plants using Deep Learning (딥러닝 기반 제조 공장 내 AGV 객체 인식에 대한 연구)

  • Lee, Gil-Won;Lee, Hwally;Cheong, Hee-Woon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.1
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    • pp.36-43
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    • 2021
  • In this research, the accuracy of YOLO v3 algorithm in object detection during AGV (Automated Guided Vehicle) operation was investigated. First of all, AGV with 2D LiDAR and stereo camera was prepared. AGV was driven along the route scanned with SLAM (Simultaneous Localization and Mapping) using 2D LiDAR while front objects were detected through stereo camera. In order to evaluate the accuracy of YOLO v3 algorithm, recall, AP (Average Precision), and mAP (mean Average Precision) of the algorithm were measured with a degree of machine learning. Experimental results show that mAP, precision, and recall are improved by 10%, 6.8%, and 16.4%, respectively, when YOLO v3 is fitted with 4000 training dataset and 500 testing dataset which were collected through online search and is trained additionally with 1200 dataset collected from the stereo camera on AGV.

Monitoring Landcreep Using Terrestrial LiDAR and UAVs (지상라이다와 드론을 이용한 땅밀림 모니터링 연구)

  • Jong-Tae Kim;Jung-Hyun Kim;Chang-Hun Lee;Seong-Cheol Park;Chang-Ju Lee;Gyo-Cheol Jeong
    • The Journal of Engineering Geology
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    • v.33 no.1
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    • pp.27-37
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    • 2023
  • Assessing landcreep requires long-term monitoring, because cracks and steps develop over long periods. However, long-term monitoring using wire extensometers and inclinometers is inefficient in terms of cost and management. Therefore, this study selected an area with active landcreep and evaluated the feasibility of monitoring it using imagesing from terrestrial LiDAR and drones. The results were compared with minute-by-minute data measured in the field using a wire extensometer. The comparison identified subtle differences in the accuracy of the two sets of results, but monitoring using terrestrial LiDAR and drones did generate values similar to the wire extensometer. This demonstrates the potential of basic monitoring using terrestrial LiDAR and drones, although minute-byminute field measurements are required for analyzing and predicting landcreep. In the future, precise monitoring using images will be feasible after verifying image analysis at various levels and accumulating data considering climate and accuracy.

Utilization of Ground Control Points using LiDAR Intensity and DSM (LiDAR 반사강도와 DSM을 이용한 지상기준점 활용방안)

  • Lim, Sae-Bom;Kim, Jong-Mun;Shin, Sang-Cheol;Kwon, Chan-O
    • Spatial Information Research
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    • v.18 no.5
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    • pp.37-45
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    • 2010
  • AT(Aerial Triangulation) is the essential procedure for creating orthophoto and transforming coordinates on the photographs into the real world coordinates utilizing GCPs (Ground Control Point) which is obtained by field survey and the external orientation factors from GPS/INS as a reference coordinates. In this procedure, all of the GCPs can be collected from field survey using GPS and Total Station, or obtained from digital maps. Collecting GCPs by field survey is accurate than GCPs from digital maps; however, lots of manpower should be put into the collecting procedure, and time and cost as well. On the other hand, in the case of obtaining GCPs from digital maps, it is very difficult to secure the required accuracy because almost things at each stage in the collecting procedure should rely on the subjective judgement of the performer. In this study, the results from three methods have been compared for the accuracy assessment in order to know if the results of each case is within the allowance error: for the perceivable objects such as road boarder, speed bumps, constructions etc., 1) GCPs selection utilizing the unique LiDAR intensity value reflected from such objects, 2) using LiDAR DSM and 3) GCPs from field survey. And also, AT and error analysis have been carried out w ith GCPs obtained by each case.

Mapping Man-Made Levee Line Using LiDAR Data and Aerial Orthoimage (라이다 데이터와 항공 정사영상을 활용한 인공 제방선 지도화)

  • Choung, Yun-Jae;Park, Hyen-Cheol;Chung, Youn-In;Jo, Myung-Hee
    • Journal of the Korean Association of Geographic Information Studies
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    • v.14 no.1
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    • pp.84-93
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    • 2011
  • Levee line mapping is critical to the protection of environments in river zones, the prevention of river flood and the development of river zones. Use of the remote sensing data such as LiDAR and aerial orthoimage is efficient for river mapping due to their accessibility and higher accuracy in horizontal and vertical direction. Airborne laser scanning (LiDAR) has been used for river zone mapping due to its ability to penetrate shallow water and its high vertical accuracy. Use of image source is also efficient for extraction of features by analysis of its image source. Therefore, aerial orthoimage also have been used for river zone mapping tasks due to its image source and its higher accuracy in horizontal direction. Due to these advantages, in this paper, research on three dimensional levee line mapping is implemented using LiDAR and aerial orthoimage separately. Accuracy measurement is implemented for both extracted lines generated by each data using the ground truths and statistical comparison is implemented between two measurement results. Statistical results show that the generated 3D levee line using LiDAR data has higher accuracy than the generated 3D levee line using aerial orthoimage in horizontal direction and vertical direction.

Topographical Changes in Torrential Stream After Dredging in Erosion Control Dam - Using Terrestrial LiDAR Data - (사방댐 준설이 계류의 지형변화에 미치는 영향 - 지상 LiDAR 자료를 이용하여 -)

  • Seo, Junpyo;Woo, Choongshik;Lee, Changwoo;Kim, Kyongha;Lee, HeonHo
    • Journal of Korean Society of Forest Science
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    • v.103 no.3
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    • pp.392-401
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    • 2014
  • This research was carried out to understand the impact of mountainous torrent on topographical change of slope and sediment volume within a deposit line by dredging of soil erosion control dam. Terrestrial LiDAR surveys were conducted at dredged and non-dredged sites. Terrestrial LiDAR has an advantage on detecting topographical changes easily without demanding workmanship and technical skill for users. The distribution of erodible slope ($20^{\circ}-40^{\circ}$) was higher in non-dredged site than that of dredged site. However, the distribution was higher in dredged site than that of non-dredged site after rainy season. Erosion and deposition appeared regularly in a dredged site, but those occurred irregularly in the non-dredged site. The inflow of soil per square meter was 1.7 times higher in dredged site than that of non-dredged site after rainy season. The difference of rainfall in each site did not affect to soil erosion. The distribution of erodible slope was increased in dredged site than that of non-dredged site after rainy season due to inflow of soil from upper stream caused by dredging.

Comparison of Accuracy and Characteristics of Digital Elevation Model by MMS and UAV (MMS와 UAV에 의한 수치표고모델의 정확도 및 특성 비교)

  • Park, Joon-Kyu;Um, Dae-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.11
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    • pp.13-18
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    • 2019
  • The DEM(Digital Elevation Model) is a three-dimensional spatial information that stores the height of the terrain as a numerical value. This means the elevation of the terrain not including the vegetation and the artifacts. The DEM is used in various fields, such as 3D visualization of the terrain, slope, and incense analysis, and calculation of the quantity of construction work. Recently, many studies related to the construction of 3D geospatial information have been conducted, but research related to DEM generation is insufficient. Therefore, in this study, a DEM was constructed using a MMS (Mobile Mapping System), UAV image, and UAV LiDAR (Light Detection And Ranging), and the accuracy evaluation of each result was performed. As a result, the accuracy of the DEM generated by MMS and UAV LiDAR was within ± 4.1cm, and the accuracy of the DEM using the UAV image was ± 8.5cm. The characteristics of MMS, UAV image, and UAV LiDAR are presented through a comparison of data processing and results. The DEM construction using MMS and UAV can be applied to various fields, such as an analysis and visualization of the terrain, collection of basic data for construction work, and service using spatial information. Moreover, the efficiency of the related work can be improved greatly.

A Study on Extraction of Croplands Located nearby Coastal Areas Using High-Resolution Satellite Imagery and LiDAR Data (고해상도 위성영상과 LiDAR 자료를 활용한 해안지역에 인접한 농경지 추출에 관한 연구)

  • Choung, Yun-Jae
    • Journal of the Korean Association of Geographic Information Studies
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    • v.18 no.1
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    • pp.170-181
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    • 2015
  • A research on extracting croplands located nearby coastal areas using the spatial information data sets is the important task for managing the agricultural products in coastal areas. This research aims to extract the various croplands(croplands on mountains and croplands on plain areas) located nearby coastal areas using the KOMPSAT-2 imagery, the high-resolution satellite imagery, and the airborne topographic LiDAR(Light Detection And Ranging) data acquired in coastal areas of Uljin, Korea. Firstly, the NDVI(Normalized Difference Vegetation Index) imagery is generated from the KOMPSAT-2 imagery, and the vegetation areas are extracted from the NDVI imagery by using the appropriate threshold. Then, the DSM(Digital Surface Model) and DEM(Digital Elevation Model) are generated from the LiDAR data by using interpolation method, and the CHM(Canopy Height Model) is generated using the differences of the pixel values of the DSM and DEM. Then the plain areas are extracted from the CHM by using the appropriate threshold. The low slope areas are also extracted from the slope map generated using the pixel values of the DEM. Finally, the areas of intersection of the vegetation areas, the plain areas and the low slope areas are extracted with the areas higher than the threshold and they are defined as the croplands located nearby coastal areas. The statistical results show that 85% of the croplands on plain areas and 15% of the croplands on mountains located nearby coastal areas are extracted by using the proposed methodology.

Analysis of Settlement Characteristics of Block Pavement in Port Through Field Tests (현장시험을 통한 항만 구역 내 블록 포장의 침하 특성 분석)

  • Ha, Yong-Soo;Kim, Yun-Tae;Oh, Myounghak
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.44 no.2
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    • pp.203-214
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    • 2024
  • Ports often suffer pavement damage due to soft ground and heavy equipment operations, leading to issues such as differential settlement and cracks. In this study, we developed port concrete blocks and applied them to a port in two configurations to figure out settlement characteristics. Falling weight deflectometer (FWD) tests on asphalt pavement and block pavements were conducted to figure out deflection and bearing capacity. The block pavement with the cement treated base showed improved bearing capacity with the port operation since lower settlements were detected than asphalt pavement. In the cement treated base, the relative deflection ratio to asphalt concrete pavement was less than 1, indicating enhanced bearing capacity. LiDAR measurements identified multiple settlements in the crushed-stone base due to surface loads after construction. Both relative deflection ratio and LiDAR measurements suggested that block pavement can be widely applied to various port sites with its applicability and bearing capacity of cement-treated base.

Occupational Exposure to Blood and Body Fluids Among Health Care Professionals in Bahir Dar Town, Northwest Ethiopia

  • Yenesew, Muluken Azage;Fekadu, Gedefaw Abeje
    • Safety and Health at Work
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    • v.5 no.1
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    • pp.17-22
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    • 2014
  • Background: Health care professionals (HCPs) are at high risk of contracting blood-borne infections due to their occupational exposure to blood and body fluids (BBFs). The incidence of these infections among HCPs are higher in low income countries such as Ethiopia. The aim of the study was to investigate the extent of occupational exposure to BBFs and its associated factors among HCPs in Bahir Dar town, Ethiopia. Methods: A cross-sectional study was used from October 1, 2012 to October 30, 2012. Three hundred and seventeen HCPs were included in the study using a simple random sampling technique. The data were collected using a structured questionnaire and analyzed using SPSS version 16. Bivariate and multivariate analyses were used to identify the factors related to exposure to BBFs. Results: Two hundred and nine (65.9%) HCPs were exposed to BBFs in the past year, of which 29.0% were needlestick injuries. Work experience [adjusted odds ratio (AOR) 4.13, 95% confidence interval (CI) 1.56-10.91], inconsistent use of gloves (AOR 1.98, 95% CI 1.04-3.43), and not complying with standard precautions (AOR 1.80, 95% CI 1.00-3.22) were the factors associated with occupational exposure to BBFs. Conclusion: A high proportion of HCPs was exposed to BBFs in this study. Occupational exposure to BBFs was determined by the use of gloves and not complying with standard precautions. Ensuring the availability of gloves, training about standard precautions, and motivation of HCPs to implement standard precautions should be emphasized to avoid such exposures.

Synthesis, Characterization and in vitro Antibacterial Studies on Mixed Ligand Complexes of Iron(III) Based on 1,10-phenanthroline

  • Tigineh, Getinet Tamiru;Sitotaw, Getu;Workie, Amogne;Abebe, Atakilt
    • Journal of the Korean Chemical Society
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    • v.65 no.3
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    • pp.203-208
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    • 2021
  • As part of our attempt to discover novel active compounds against multi-drug resistant pathogens, we hereby report two new complexes of iron(III) with formulae: [Fe(L1)2(H2O)2]Cl3 and [Fe(L1)2(L2)(H2O)]Cl2 where L1 = 1,10-phenanthroline (C12H8N2) and L2 = guanide (C5H4N5O-). The synthesized complexes were characterized using spectroscopic analysis (ESI-MS, ICP-OES, FT-IR, and UV-Vis), cyclic voltammetry, CHN analysis, gravimetric chloride determination, melting point determination, and conductance measurement. Octahedral geometries are assigned to both complexes. In vitro antibacterial activity was tested on two Gram-positive (Staphylococcus aureus, Streptococcus epidermidis) and two Gram-negative (Escherichia coli and Klebsiella pneumoniae) bacteria using the disc diffusion method. The complexes demonstrated appreciable activity against these pathogens. Interestingly, the [Fe(L1)2(L2)(H2O)]Cl2 complex manifested a higher degree of inhibition against the drug-resistant Gram-negative bacteria than the commercially available drug, namely erythromycin.