Predictive Decision and Reliable Accessing for UAV Communication in Space-Air-Ground Integrated Networks

The cooperation of multiple Unmanned Aerial Vehicles(UAVs) has become a promising scenario in Space-Air-Ground Integrated Networks(SAGINs) recently due to their widespread applications,where wireless communication is a basic necessity and is normally categorized into control and nonpayload communication(CNPC) as well as payload communication. In this paper, we attempt to tackle two challenges of UAV communication respectively on establishing reliable CNPC links against the high mobility of UAVs as well as changeable communication conditions, and on offering dynamic resource optimization for Quality-of-Service(QoS) guaranteed payload communication with variable link connectivity. Firstly, we propose the concept of air controlling center(ACC), a virtual application equipped on the infrastructure in SAGINs, which can collect global information for estimating UAV trajectory and communication channels. We then introduce the knapsack problem for modelling resource optimization of UAV communication in order to provide optimal access points for both CNPC and payload communication. Meanwhile, using the air controlling information, predictive decision algorithm and handover strategy are introduced for the reliable connection with multiple access points. Simulation results demonstrate that our proposal ensures an approximate always-on reliable accessing of communication links and outperforms the existing methods against high mobility,sparse distribution, and physical obstacles.

Efficacy of TCM Fumigation Using Dampness-and-cold-dispelling Formula Combined with Methotrexate and Leflunomide Treating Rheumatoid Arthritis with Cold-dampness Bi Syndrome

Background:Rheumatoid arthritis(RA),a chronic autoimmune disease,has a high incidence and disability rate,causing patients significant discomfort.Although several medicines can be effective,they are also associated with significant adverse effects.In contrast,fumigation as one of the most often used traditional Chinese medicine(TCM)external therapy has shown both efficacy and safety with less side effect.In light of this,we comple-ment western medicine treatment with TCM fumigation therapy to improve patients’clinical efficacy,alleviate symptoms,and improve prognosis.Objective:To investigate the therapeutic effect of TCM fumigation and modern medicine combined therapy in treating RA patients with cold-dampness Bi syndrome.Methods:A single-center,randomized,controlled study was designed.From January 2022 to December 2022,a total of 60 RA patients with cold-dampness Bi syndrome were enrolled in the study.The control group(30 cases)received conventional modern medicine treatment with methotrexate for 4 weeks,while the observation group(30 cases)for 4 weeks received a combination of TCM fumigation treatment and conventional modern medicine.The effects of the two groups were comprehensively compared,including the changes in TCM symptom scores and laboratory indicators,as well as the use of visual analogue scale(VAS)and health status rating scale(HAQ)before and after treatment.Results:The total effective rate of the observation group was 93.3%,which was significantly higher than that of the control group,which is 70%(P<0.05).Before treatment,there were no significant differences in joint functional activity,pain visual analogue scale(VAS),health assessment questionnaire(HAQ-DI)and laboratory indexes between the two groups(P>0.05).After treatment,each group compared to their initial condition,respectively,showed major improvement of joint functional activity and significantly decreased VAS,HAQ-DI,and RA-related biomarkers(P<0.05);inter-group comparison of these indicators showed significanty further enhanced effect of TCM fumigation combined therapy on the RA-related biomarkers and joint functional activity of patients(P<0.05),yet the control group receiving only modern medicine showed better results of the VAS and HAQ-DI.Conclusion:The TCM fumigation combined therapy is effective to treat RA patients with cold-dampness Bi syn-drome,and to enhance their life quality,improving the joint function,and reducing inflammation.

Adaptive fuzzy asymptotic control design for MIMO nonlinear systems with state constraints

This paper addresses the asymptotic control problem of uncertain multi-input and multi-output(MIMO)nonlinear systems.The considered MIMO systems contain unknown virtual control coefficients(UVCCs)and state constraints.Acreative Lyapunov function by associating with the lower bounds of UVCCs is presented to counteract the adverse effect deriving from UVCCs.The state constraints are ensured by utilising the barrier Lyapunov function.Moreover,the asymptotic tracking controller is recursively constructed by combining the backstepping technique with fuzzy logic systems.The remarkable character of the designed controller is that the asymptotic tracking performance can be achieved by introducing some smooth functions into adaptive backstepping procedure.In contrast to the existing results,the conditions on the UVCCs are relaxed.Finally,the new control design is illustrated by a practical example.