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( Wenzhu Zhang ),( Kyung Sup Kwak ),( Chengxiao Feng ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.7
In order to guide users to select the most optimal access network in heterogeneous wireless networks, a network selection algorithm is proposed which is designed based on multi-objective discrete particle swarm optimization (Multi-Objective Discrete Particle Swarm Optimization, MODPSO). The proposed algorithm keeps fast convergence speed and strong adaptability features of the particle swarm optimization. In addition, it updates an elite set to achieve multi-objective decision-making. Meanwhile, a mutation operator is adopted to make the algorithm converge to the global optimal. Simulation results show that compared to the single-objective algorithm, the proposed algorithm can obtain the optimal combination performance and take into account both the network state and the user preferences.
LIHUA SHEN,CHENGXIAO ZHANG,BEI YAN,XIAOXIA LI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
A strong electrochemiluminescence (ECL) emission from ZnO nanoparticles (NPs) suspended inaqueous solution at a Pt electrode or in NPs layers modi¯ed on a Pt or graphite electrode, whichoccurred between ? 1 : 0 V(versus Ag/AgCl, Sat. KCl) and ? 2 : 0 V, was observed in 0.25 M NaOHin the presence of peroxydisulfate. The ECL intensity was linear to the concentration of sus-pended ZnO NPs in the range from 1 : 0 ? 10? 5 to 1 : 0 ? 10? 3 g/mL. The ECL spectrum of ZnONPs revealed that both ZnO and peroxydisulfate-dissolved oxygen have been involved in the ECLprocess, and ECL spectrum has a red shift compared with photoluminescence (PL). The elec-trochemical redox behavior of ZnO NPs was also studied at a ZnO NPs modi¯ed carbon pasteelectrode by entrapping ZnO NPs in carbon paste, which reveals that the alkaline mediumchanged the surface state of ZnO NPs. The surface passivation has a signi¯cant e®ect on the ZnONPs'electrochemical behaviors.
Sampling-based Event-triggered and Self-triggered Control for Linear Systems
Jun Chen,Yuan Fan,Chengxiao Zhang,Cheng Song 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.3
This work considers the event-triggered and self-triggered control for linear systems with periodic sampling schemes. An event-triggered control using sampled states is proposed. The asymptotic stability of the closedloop system is guaranteed by a condition in terms of a linear matrix inequality. Moreover, a self-triggered control with sampling is presented and the next control task release time is predicted based on the current sampled data. It is noted that by introducing the periodic sampling scheme, Zeno behaviors can be naturally avoided in both of the algorithms. Finally, simulation results are provided to illustrate the theoretical effectiveness.