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Exposure to lead(Pb) or cadmium(Cd) has been related to decreasing thyroxine in many previous studies. The underlying mechanisms have not been clarified. Heavy metal-induced thyroid autoimmunity in pregnant women has been found, despite having been rarely explored in the general population.We aimed to determine whether the blood levels of lead(BPb) or cadmium(BCd) related to the levels of sera antibodies...
Background China has undergone rapid urbanization in the past three decades. We aimed to report blood lead level (B-Pb) in the most rapidly urbanized Yangtze River Delta Region of China, and explore the association B-Pb and non-alcoholic fatty liver disease (NAFLD). Methods Our data source was the SPECT-China study. We enrolled 2011 subjects from 6 villages in the Yangtze River Delta Region. Lead...
Vehicular ad hoc networks (VANETs) allow vehicles to generate and broadcast messages to inform nearby vehicles about road conditions. We propose a multi-hop announcement scheme for VANETs which supports message broadcasting and forwarding. In this scheme, we propose two algorithms to evaluate the reliability of messages and aggregate the reputation scores respectively. The major principle of the reliability...
In this paper, we study pattern preserving path following control of unicycle teams with communication delays. The pattern of the vehicle team is said to be preserved if the distance between it and the desired one remains in some given range. A virtual vehicle formation is introduced such that each virtual vehicle becomes the pursuit target for the corresponding real vehicle. First, an input-driven...
In this paper, virtual structure and artificial potential field (APF) based strategies are integrated to realize formation tracking control for a team of unicycles with collision avoidance property. Using virtual structure, each vehicle is required to track a virtual local leader (VLL) for formation maintenance. For inter-vehicle collision avoidance, the motion of each vehicle is restricted in a specified...
In this paper, we study the control strategy for connectivity guaranteed trajectory tracking for multi-agent systems using artificial potential based approach. Some agents, called active agents (AAs), which are attracted by the reference point (modeled as the virtual leader), lead the rest of the group to perform the task. Special features of our approach are that the group is not required to be initially...
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