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( Xianxian Wang ),( Shaobo Lv ),( Xing Wang ),( Zhongshan Zhang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.4
Resource allocation in device-to-device (D2D) aided cellular systems, in which the proximity users are allowed to communicate directly with each other without relying on the intervention of base stations (BSs), is investigated in this paper. A new uplink resource allocation policy is proposed by exploiting the relationship between D2D-access probability and channel gain among variant devices, such as cellular user equipments (CUEs), D2D user equipments (DUEs) and BSs, etc., under the constraints of their minimum signal to interference-plus-noise ratio (SINR) requirements. Furthermore, the proposed resource-allocation problem can be formulated as the cost function of “maximizing the number of simultaneously activated D2D pairs subject to the SINR constraints at both CUEs and DUEs”. Numerical results relying on system-level simulations show that the proposed scheme is capable of substantially improving both the D2D-access probability and the network throughput without sacrificing the performance of conventional CUEs.
Shaoqing Guo,Liangfu Zhao,Xiaoxiao Wang,Fang Guo,Xianxian Wei,Zhenmin Liu,Wei Zhang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7
A series of SAPO-11 zeolites with different Si contents were prepared by hydrothermally synthesized method. They were characterized by ICP, XRD, SEM, FT-IR, N2 adsorption-desorption, NH3-TPD and 29Si MAS NMR, and evaluated by the methylation of naphthalene with methanol to 2,6-dimethylnaphthalene (2,6-DMN). According to XRD and SEM results, the crystallinity of SAPO-11 sample increased with increase of the Si content until the SiO2/Al2O3 ratio was up to 0.2. However, a reduction in the crystallinity was observed with further increase of the Si content of the synthesis. N2 adsorption-desorption results showed that all the samples possessed micropores and secondary mesopores. SAPO-11 sample with SiO2/Al2O3 ratio of 0.2 exhibited the largest secondary mesopores size distributions. NH3-TPD and 29Si MAS NMR showed that the Si content was incorporated into the framework affecting not only the acid sites but also the acid strength of SAPO-11. SAPO-11 with SiO2/Al2O3 ratio of 0.2 presented the high catalytic performances for the methylation of naphthalene, which was mainly attributed to the amount of secondary mesopores in the SAPO-11 zeolite.
Kairui Chen,Zhangmou Zhu,Jianhui Wang,Xianxian Zeng 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.4
In this paper, the output regulation problem for heterogeneous linear multi-agent systems is investigated, where each agent suffers from the detectability deficiency problem. Specifically, each agent has access to only partial output information of the exosystem, which bring about challenges to estimate full states of the exosystem. By using the observability decomposition technique, unobservable states in each agent are extracted. Then, a kind of distributed observer with dynamic event-triggered mechanism is developed to estimate full states of the exosystem for each agent cooperatively. Besides, the Zeno behavior is voided strictly when executing the event-triggered strategy. Furthermore, the distributed observer is employed to solve the output regulation problem of heterogeneous multi-agent systems based on the feedforward output regulation technique. Finally, a numerical example is conducted to verify the correctness of the proposed control algorithm.