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Battery lifetime is critical for wireless video sensors. To enable battery-powered wireless video sensors, low-power design is required. In this paper, we consider applying multi-view summarization to wireless video sensors to remove redundant contents such that the compression and transmission power can be reduced. A low-complexity online multi-view video summarization scheme is proposed. Experiments show that the proposed summarization method successfully reduces the video content while keeping important events. A power analysis of the system also shows that a significant amount of energy can be saved. [ABSTRACT FROM PUBLISHER]

Highlights: [•] Weakly base hot spring water at 40°C does not affect strength development for shotcrete and concrete. [•] Curing in hot spring at 40°C may benefit early stage strength development and subsequent integrity. [•] Chloride and sulfate ions in hot spring do not enhance the alkali–aggregate or carbonate reaction. [ABSTRACT FROM AUTHOR]

Recently a new approach to modeling cellular networks has been proposed based on the Poisson point process (PPP). Unlike the traditional, popular hexagonal grid model for the locations of base stations, the PPP model is tractable. It has been shown by Andrews et al. (in IEEE Trans Commun 59(11):3122-3134, ) that the hexagonal grid model provides upper bounds of the coverage probability while the PPP model gives lower bounds. In this paper, we perform a comprehensive comparison of the PPP and the hexagonal grid models with real base station deployments in urban areas worldwide provided by the open source project OpenCellID. Our simulations show that the PPP model gives upper bounds of the coverage probabilities for urban areas and is more accurate than the hexagonal grid model. In addition, we show that the Poisson cluster process is able to accurately model the base station location distribution. [ABSTRACT FROM AUTHOR]

Abstract: As a simple, portable method that uses inexpensive tools for structural safety inspections of tunnels, this study presents a novel image-mosaic technology that generates layouts of tunnel wall surfaces. Geometric distortion in camera images of 3D tunnel surfaces is rectified through equations related to projection characteristics and the bilinear interpolation method. Successive taken images with at least four reference points in each one are then resampled to a 2D coordinate for the layout of tunnel surfaces. Test results for a laboratory-scale tunnel demonstrate that the spatial accuracy of the proposed image-mosaic technology for a mosaicked layout from vertical images is approximately 1.6° with sufficient image resolution for detecting lining cracks with widths exceeding 0.45mm. Field application to a full-size, operational tunnel indicates that the layout of tunnel wall surfaces by the proposed technology is sufficient for identifying lining crack distributions and detecting temporal variations in cracks. [Copyright &y& Elsevier]