Browsing by Author "Sun, Youxian"

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    Continuous drug infusion for diabetes therapy: A closed-loop control system design
    (Springer, 2007) Chen, Jiming; Cao, Kejie; Sun, Youxian; Xiao, Yang; Su, Xu (Kevin); Zhejiang University; University of Alabama Tuscaloosa; University of Texas System; University of Texas at San Antonio (UTSA)
    While a typical way for diabetes therapy is discrete insulin infusion based on long-time interval measurement, in this paper, we design a closed-loop control system for continuous drug infusion to improve the traditional discrete methods and make diabetes therapy automatic in practice. By exploring the accumulative function of drug to insulin, a continuous injection model is proposed. Based on this model, proportional-integral-derivative (PID) and fuzzy logic controllers are designed to tackle a control problem of the resulting highly nonlinear plant. Even with serious disturbance of glucose, such as nutrition absorption at meal time, the proposed scheme can perform well in simulation experiments. Copyright (c) 2008.Jiming Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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    Temperature-aware routing for Telemedicine applications in embedded biomedical sensor networks
    (Springer, 2008) Takahashi, Daisuke; Xiao, Yang; Hu, Fei; Chen, Jiming; Sun, Youxian; University of Alabama Tuscaloosa; Rochester Institute of Technology; Zhejiang University
    Biomedical sensors, called invivo sensors, are implanted in human bodies, and cause some harmful effects on surrounding body tissues. Particularly, temperature rise of the invivo sensors is dangerous for surrounding tissues, and a high temperature may damage them from a long term monitoring. In this paper, we propose a thermal-aware routing algorithm, called least total-route-temperature (LTRT) protocol, in which nodes temperatures are converted into graph weights, and minimum temperature routes are obtained. Furthermore, we provide an extensive simulation evaluation for comparing several other related schemes. Simulation results show the advantages of the proposed scheme.