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Stackelberg Game for Distributed Time Scheduling in RF-Powered Backscatter Cognitive Radio Networks
Wang, Wenbo,Hoang, Dinh Thai,Niyato, Dusit,Wang, Ping,Kim, Dong In IEEE 2018 IEEE Transactions on Wireless Communications Vol.17 No.8
<P>In this paper, we study the transmission strategy adaptation problem in an RF-powered cognitive radio network, in which hybrid secondary users are able to switch between the harvest-then-transmit mode and the ambient backscatter mode for their communication with the secondary gateway. In the network, a monetary incentive is introduced for managing the interference caused by the secondary transmission with imperfect channel sensing. The sensing-pricing-transmitting process of the secondary gateway and the transmitters is modeled as a single-leader-multi-follower Stackelberg game. Furthermore, the follower sub-game among the secondary transmitters is modeled as a generalized Nash equilibrium problem with shared constraints. Based on our theoretical discoveries regarding the properties of equilibria in the follower sub-game and the Stackelberg game, we propose a distributed, iterative strategy searching scheme that guarantees the convergence to the Stackelberg equilibrium. The numerical simulations show that the proposed hybrid transmission scheme always outperforms the schemes with fixed transmission modes. Furthermore, the simulations reveal that the adopted hybrid scheme is able to achieve a higher throughput than the sum of the throughput obtained from the schemes with fixed transmission modes.</P>
Two Types of Immunoassay Based on Nile Blue Labeling Polydopamine Nanospheres
Lili Liu,Wenbo Lu,Chang Liu,Ying Wang,Jian Dong,Weiping Qian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8
The sandwich-type immunoassays have been developed by using electrochemical and surface-enhanced Raman scattering (SERS) techniques for the detection of carcinoembryonic antigen (CEA). Nile blue as a kind of Raman dye has been decorated on nanospheres with polydopamine resin (PDR) via π-stacking interaction. The Nile blue displays the strong SERS signals as well as a characteristic electrochemical reduction peak at -0.33V (versus Ag/AgCl). The implementation of the PDR nanospheres mixing with Au nanoparticles (AuNPs/PDR) exhibits a better electrical conductivity and large SERS enhancement. The immunoassays based on Nile blue-labeled AuNPs/PDR nanospheres have been fabricated by using electrochemical and SERS techniques for the detection of CEA. The proposed immunoassay shows higher sensitivity, high selectivity, lower detection limit and long-term stability. The performances of the electrochemical immunoassay are better than that of SERS immunoassay. For the electrochemical immunoassay, the linear range occurs from 1 pg/mL to 100 ng/mL (R = 0.995) with a detection limit of 0.68 pg/mL and signal-to-noise ratio of 3 in the detection of CEA. The data for the analysis of human serum samples by using the electrochemical method are acceptably consistent with those obtained from the enzyme-linked immunosorbent assay (ELISA). The proposed immunoassay exhibits a promising potential for application in clinical diagnosis.
Yang Zhao,Xiaojian Peng,Wenbo Chai,Yingquan Tan,Qing Dong,Haiyang Jiang,Beijiu Cheng 한국유전학회 2017 Genes & Genomics Vol.39 No.1
Integrated networks of gene expression, hormonal signaling and metabolite sensing regulate phyllotaxy pattern development. In this study, we characterized differentially expressed genes (DEGs) between maize plants with alternate and opposite phyllotaxies. Gene ontology and Kyoto Encyclopedia of Genes and Genomes analyses showed that 2432 DEGs were involved in biological processes, molecular functions, cellular components and many pathways. Importantly, we identified 19 DEGs related to plant hormone signal transduction. Additionally, we identified four main alternative splicing types: skipped exons, retained introns, alternative 50-splice sites, and alternative 30-splice sites, which exhibited different characteristics in the alternate and opposite phyllotaxy libraries. The reliability of the sequencing data was verified through using quantitative real-time reverse transcription PCR analysis of the 19 genes: 15 were validated to play a role in phytohormone signal transduction pathways. Taken together, our data provide new insight into the mechanisms of phyllotaxy pattern development, and will increase our understanding of how relative changes in gene expression determine alternate/opposite phyllotaxy in maize.
Yin, Binfeng,Zheng, Wenshu,Dong, Mingling,Yu, Wenbo,Chen, Yiping,Joo, Sang Woo,Jiang, Xingyu The Royal Society of Chemistry 2017 The Analyst Vol.142 No.16
<P>We developed a competitive colorimetric nanosensor based on Au@Ag bimetallic nanoparticles for the detection of interleukin-6 (IL-6) in clinical samples. Antibody-conjugated magnetic nanoparticles (MNPs) and polystyrene (PS) microparticles conjugated with both catalase and a secondary antibody can form sandwich structures that enable one-step target enrichment and separation. The catalase on the surface of the PS can catalyze the hydrolysis of hydrogen peroxide (H2O2) to regulate the deposition of Ag<SUP>+</SUP> on the surface of gold nanoparticles (AuNPs), and forms different sizes and amounts of Au@Ag bimetallic nanoparticles (Au@AgNPs) which produce a distinct color signal for readout with the naked eye. Our sensor features high sensitivity, selectivity, reproducibility and anti-interference property as a result of comprehensive parameter optimization. The limit of detection of IL-6 can reach 11 pg mL<SUP>−1</SUP> with the naked eye and 1.2 pg mL<SUP>−1</SUP> by quantitative instrumental analysis. The whole analysis can be finished within 1 h. More importantly, we successfully apply our platform or the detection of IL-6 in clinical samples with better accuracy than conventional enzyme-linked immunosorbent assay (ELISA).</P>
Performance investigation of nanoscale thermal cloak by the perforated silicon film
Zhang Jian,Zhang Haochun,Zhang Dong,Sun Wenbo,Li Yiyi 한국물리학회 2022 Current Applied Physics Vol.35 No.-
In recent years, nanoscale thermal cloak, as a representative of nanoscale heat flux regulation devices, has attracted a lot of attention from researchers. However, the existing design methods are relatively complicated and all adopt constant temperature boundaries, the temperature changes constantly in the real environment, which greatly hinders its engineering applications. In this paper, inspired by phonon localization theory, we construct a nanoscale thermal cloak by a perforated silicon membrane and evaluate its cloaking performance and dynamic response. Results show that when the perforated area is fixed, the more the number of holes, the better the cloaking performance. In addition, the nanoscale thermal cloak still exhibits good cloaking performance in the dynamic environment. Finally, the cloaking mechanism is analyzed by calculating the phonon density of states (PDOS) and mode participation rate (MPR), and the reduction of thermal conductivity in the functional region is attributed to phonon localization.