Bridge inspection using unmanned aerial vehicles (UAV) with high performance vision sensors has received considerable attention due to its safety and reliability. As bridges become obsolete, the number of that need be inspected increases, they require much maintenance cost. Therefore, a bridge method based on UAV is proposed as one promising strategies maintain bridges. In this paper, crack identification by commercial resolution sensor investigated in an aging concrete bridge. First, point...

In the previous study, a paired structured light system which incorporates lasers, cameras, and screens was proposed, experimental tests validated potential of displacement measurement for large structures. However, estimation relative translational rotational displacements between two sides based on an assumption that there is zero initial three laser beams are always screens. this paper, calibration method proposed to offset using first captured image. The matrix derived from used...

<title>Abstract</title> Additive manufacturing (AM) combined with the innovation of Internet Things (IoT) has made faster and more convenient than ever. However, increased connectivity exposed systems to potential security breaches. To address this vulnerability, study presents a novel methodology monitor AM using side-channel monitoring framework based on power meter. The meter measures energy consumption every G/M-code command. Concurrently, machine learning (ML) model is trained predict...

Abstract In a maritime application for Small Modular Reactors (SMR), Floating Nuclear Power Plants (FNPP) are emerging as game changer in the offshore industry. The successful development of FNPP is dependent on concept and design containment system its ability to safely shield radiations protect SMR case accidents. Unlike land-based nuclear power plants (NPP), marine facilities like offer limited footprint modules. This limitation causes difficulties FNPP’s direct concepts fourth fifth...

Due to the increase in aging structures and decrease construction workforce, there is an increasing interest automating structural damage monitoring. Surface on concrete structures, such as cracks, delamination, rebar exposure, one of important parameters that can be used estimate condition structure. In this paper, deep learning-based detection quantification using structured lights a depth camera proposed. The proposed monitoring system composed four lasers camera. are projected surface...

As civil infrastructures get larger and more complex, the development of robot technologies that help to construct, monitor, inspect, manage is in need. In this paper, we introduce two major for construction monitoring infrastructures. The first one beacon-based localization technology robust human. A novel method proposed where it utilizes map information structure signal propagation model. second modular system structural health (SHM) large structures. To develop an SHM directly measures...

In previous studies, a visually servoed paired structured light system (ViSP) was proposed to estimate structural displacement with high accuracy at low cost. Although the performance of has been verified from various simulations and experimental tests, it limitation that high-speed dynamic cannot be measured properly due relatively sampling rate. To speed up ViSP, in this paper, an inertial measurement unit (IMU) rate is concurrently used ViSP Kalman filtering framework. By combining...

Structural displacement is an important indicator for assessing structural safety. For monitoring, vision-based measurement systems have been widely developed; however, most estimate only 1 or 2-DOF translational displacement. To monitor the 6-DOF with high accuracy, a system uniquely designed marker proposed in this paper. The composed of and camera zooming capability, relative rotational between estimated by finding homography transformation. novel to make robust noise based on sensitivity...

Structural displacement is considered an important indicator to assess structural conditions. To directly measure the in time domain, a visually servoed paired structured light system was proposed. The composed of two sides facing each other, with one or lasers that are controlled by two-DOF manipulator, camera, and screen. relative six-DOF between can be estimated calculating positions projected laser beams on screens rotation angles manipulators. verify performance proposed system, kinds...

As civil structures are exposed to various external loads, it is essential assess the structural condition, especially displacement, in every moment. Therefore, a visually servoed paired structured light system was proposed previous study. The composed of two screens facing with each other, camera, screen, and one or lasers controlled by 2-DOF manipulator. 6-DOF displacement can be calculated from positions three projected laser beams rotation angles manipulators. In estimation process,...

Severe earthquakes can cause damage to society both socially and economically. An appropriate initial response alleviate from severe earthquakes. In order formulate an response, it is necessary identify situations in societies; however, difficult grasp this information immediately after earthquake event. study, assessment methodology for buildings proposed estimating A spectrum database constructed provide spectra at arbitrary locations measurements the The fragility curves are used estimate...

To inspect structural conditions, displacement is needed to be monitored at any time. Therefore, our previous study proposed a ViSP (Visually Servoed Paired structured light system) which composed of two sides facing with each other, camera, screen, and one or lasers controlled by 2-DOF manipulator. In this system, the relative translational rotational between can estimated calculating positions projected laser beams on screens rotation angles manipulators. validate performance various...

This paper presents a novel coverage path planning algorithm for mobile robot in indoor environment. Overall region is divided into several sub-regions based on the virtually extracted doors. The key idea of this method was obtained from usual way dividing an environment sub-regions, i.e., rooms identification proposed virtual door extracts doors by overlapping Generalized Voronoi Diagram (GVD) and configuration space eroded half size. to cleaning also closing opening performance our has...

Periodic evaluation of port structures including outer walls and berthing with fenders is paramount to ensure their safety. However, most are inaccessible on land inspectors utilize floating boats for inspections. Therefore, this study aimed develop a fender segmentation system incorporating vision sensor deep learning approach. The semantic model in an encoder–decoder framework was densely connected through receptive field block convolution module each two different dilation rates...