ROAD: A New Spatial Object Search Framework for Road Networks

Abstract—In this paper, we present a new system framework called ROAD for spatial object search on road networks. ROAD is extensible to diverse object types and efficient for processing various location-dependent spatial queries (LDSQs), as it maintains objects separately from a given network and adopts an effective search space pruning technique. Based on our analysis on the two essential operations for LDSQ processing, namely, network traversal and object lookup, ROAD organizes a large road network as a hierarchy of interconnected regional subnetworks (called Rnets). Each Rnet is augmented with 1) shortcuts and 2) object abstracts to accelerate network traversals and provide quick object lookups, respectively. To manage those shortcuts and object abstracts, two cooperating indices, namely, Route Overlay and Association Directory are devised. In detail, we present 1) the Rnet hierarchy and several properties useful in constructing and maintaining the Rnet hierarchy, 2) the design and implementation of the ROAD framework, and 3) a suite of efficient search algorithms for single-source LDSQs and multisource LDSQs. We conduct a theoretical performance analysis and carry out a comprehensive empirical study to evaluate ROAD. The analysis and experiment results show the superiority of ROAD over the state-of-the-art approaches. Index Terms—Location-dependent spatial query, spatial road network, indexing techniques, and search algorithms. Ç

Experimental and Theoretical Analysis for a Fluid-Loaded, Simply Supported Plate Covered by a Damping and Decoupling Composite Acoustic Coating

This work presents a vibroacoustic response model for a fluid-loaded, simply supported rectangular plate covered by a composite acoustic coating consisting of damping and decoupling layers. The model treated the damping layer and base plate as a unified whole under pure bending moments and the decoupling layer as a three-dimensional, isotropic, linear elastic solid. The validity of the model was verified by both numerical analysis and experiments and was shown to accurately extend previous studies that were limited to a plate covered by a single damping or decoupling layer with an evaluation confined solely to numerical analysis. The trends of the numerical and experimental results are generally consistent, with some differences due to the influences of water pressure and the frequency dependence of the material parameters, which are not taken into account by the numerical analysis. Both experimental and numerical results consistently show that the radiated noise reduction effect of the composite coating is superior to that of single-type coatings, which is attributed to the fact that the composite coating combines the merits of both the high vibration suppression performance of the damping layer and the superior vibration isolation performance of the decoupling layer

Testing the impact of fiscal policies for economic recovery: does monetary policy act as catalytic tool for economic Survival

This study seeks to evaluate the efficacy of macroeconomic revamping policies operationalized after the pandemic by fiscal and monetary regulators to fight the pandemic in China. This study aims to assess what the Chinese economic recovery implies after the pandemic regarding economic expansion and energy consumption of different economies utilizing an econometric approximation relying on data throughout the COVID-19 phase. Within the extended stage, Chinese economic development spillover impacts attain the same effect on upper-middle-income nations' economic expansion of 0.18 percent, next to the economic development, of lower-middle-income countries of 0.15 percent and high-income nations. We discover proofs of robust direct provincial spillovers, implying that provinces tend to construct a cluster of high-performing and low-performing areas, a procedure that accentuates regional earnings variances. Applying the experience of revamping previous financial crisis, we replicate the impact of the pandemic on the competence of these, and by far, other upper limit income nations to build back better from the pandemic to jobs occasioned by proofs of the pandemic. The spillover impact of China’s economic revival past the pandemic phase's carries a critical effect on the expansion in energy consumption in high-income nations, subsequently middle-income nations. As total factor productivity headwinds underpin economic growth, fiscal policy is the only policy that probably sustains the pollution intensities and concurrently advances household well-being regarding consumption and jobs.Universidad Autónoma de Chil