Wireless ultraviolet (UV) has strong scattering characteristics and can communicate through non-direct *** UV signals are transmitted in the atmosphere,they are affected by the absorption and scattering effects of atm...
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Wireless ultraviolet (UV) has strong scattering characteristics and can communicate through non-direct *** UV signals are transmitted in the atmosphere,they are affected by the absorption and scattering effects of atmospheric particles and atmospheric turbulence,resulting in attenuation of UV signal energy and reduced reliability of the communication *** paper focuses on the channel model of UV non-direct-view single scattering communication,and simulates and analyzes the communication characteristics of UV light in atmospheric turbulence and mixed aerosol environment under horizontal,vertical and oblique range communication *** results show that at equal relative humidity,the wireless UV non-directive scattering communication performance for vertical communication scenarios is more affected by the mixed aerosol environment and the communication performance is worse.
In order to address the problem of inconsistent sampling frequency and accuracy of each sensor in multi-sensor data fusion technology, the algorithm of Gaussian Process Regression (GPR) is proposed for time alignment,...
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This paper addresses the open vehicle routing problem with time window(OVRPTW), where each vehicle does not need to return to the depot after completing the delivery *** optimization objective is to minimize the total...
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This paper addresses the open vehicle routing problem with time window(OVRPTW), where each vehicle does not need to return to the depot after completing the delivery *** optimization objective is to minimize the total distance. This problem exists widely in real-life logistics distribution *** propose a hybrid column generation algorithm(HCGA) for the OVRPTW, embedding both exact algorithm and metaheuristic. In HCGA, a label setting algorithm and an intelligent algorithm are designed to select columns from small and large subproblems, respectively. Moreover, a branch strategy is devised to generate the final feasible solution for the OVRPTW. The computational results show that the proposed algorithm has faster speed and can obtain the approximate optimal solution of the problem with 100 customers in a reasonable time.
DV-Hop localization algorithm contains a straightforward structure and is widely employed in wireless sensor network node localization. The DV-Hop localization algorithm has a fundamental error within the average hop ...
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Aiming at the global three-dimensional path planning of autonomous underwater vehicles (AUV) in ocean currents, a three-dimensional path planning method based on the improved imperial competition algorithm (ICA) is pr...
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In this paper， an optoelectronic oscillator (OEO) with a voltage-controlled phase shifter-based phase-locked loop (VCP-PLL) has been designed， analyzed and experimentally investigated. The experimental results show ...
In this paper， an optoelectronic oscillator (OEO) with a voltage-controlled phase shifter-based phase-locked loop (VCP-PLL) has been designed， analyzed and experimentally investigated. The experimental results show that the free-running OEO produces a frequency drift of 36 kHz within 60 minutes， whereas that of the designed VCP-PLL OEO is within 400 Hz. At frequency offsets of 1 kHz， and 10 kHz， the phase noise of the free-running and VCP-PLL OEOs are -76.1 dBc/Hz and -79.5 dBc/Hz， -98.4 dBc/Hz and -100.5 dBc/Hz， respectively. Additionally， in comparison with the OEO with a piezoelectric ceramic transducer-based PLL (PZT-PLL)， the frequency of the VCP-PLL OEO can be stable for a longer time. However， both the VCP-PLL and PZT-PLL OEOs have lower phase noise compared to the free-running OEO， while the VCP-PLL OEO exhibiting the lowest phase noise at low frequency offsets.
Vehicle re-identification aims to retrieve and match vehicles under non-overlapping cameras. Although this technology has made some progress in recent years, the problem of vehicle appearance ambiguity caused by persp...
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The operation of the power system becomes more flexible and uncertain as the electrical market reform continues to develop, requiring smart grid data processing efficiency, intelligence analysis, and processing techno...
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Text-based cross-modal person re-identification refers to the retrieval of the corresponding identity image in the pedestrian image set through the linguistic description of the pedestrian. Aiming at the problem that ...
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The rapid development of automobile industry has brought great convenience to people’s travel, but the increase of vehicles also brings a series of environmental problems and traffic problems, so this paper designs a...
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