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A Relay Selection and Power Allocation Scheme for Cooperative Wireless Sensor Networks
( Mujun Qian ),( Chen Liu ),( Youhua Fu ),( Weiping Zhu ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.4
This paper investigates optimal relay selection and power allocation under an aggregate power constraint for cooperative wireless sensor networks assisted by amplify-and-forward relay nodes. By considering both transmission power and circuit power consumptions, the received signal-to-noise ratio (SNR) at the destination node is calculated, based on which, a relay selection and power allocation scheme is developed. The core idea is to adaptively adjust the selected relays and their transmission power to maximize the received SNR according to the channel state information. The proposed scheme is derived by recasting the optimization problem into a three-layered problem ― determining the number of relays to be activated, selecting the active relays, and performing power allocation among the selected relays. Monte Carlo simulation results demonstrate that the proposed scheme provides a higher received SNR and a lower bit error rate as compared to the average power allocation scheme.
Substrate-Immersed Solvothermal Synthesis of Ordered SiO2/Ag Arrays as Catalytic SERS Substrates
Chang Liu,Qianqian Su,Li Li,Jie Sun,Jian Dong,Weiping Qian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5
In this work, we designed a simple substrate-immersed solvothermal route for the one-step synthesis of novel ordered SiO2/Ag arrays, employing SiO2 colloidal crystals as templates and alcohol as reducing agent. The Ag nanoparticles were uniformly deposited in situ onto SiO2 colloidal crystals, which exhibited high surface enhanced Raman spectroscopy (SERS) activity and uniform SERS intensity. It was found that ordered SiO2/Ag arrays could rapidly scavenge the absorbed-Nile blue A (NBA) molecules from the surfaces with the assistance of H2O2, while the SERS signals of NBA decreased sharply and almost completely disappeared within four minutes. This can be attributed to the superior catalytic activity of Ag nanoparticles. After five times of re-immersion and re-absorbing process of NBA, the substrates could still keep ~74.8% SERS intensity versus the original. The high activity and durability of the as-prepared SiO2/Ag SERS substrate endow them as a promising candidate for trace detection.
Hang Zhao,Xiaowei Cao,Man Wang,Lin Tao,Xiaoyu Pan,Chunwei Yuan,Weiping Qian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
In this paper, we report a novel antibody conjugated gold nanostars (AuNSs) as surface-enhanced Raman spectroscopy (SERS) probes for distinguishing cancer cells (A549 cells, H1229 cells) from normal cells (ATII cells). In such a probe, bovine serum albumin (BSA) was served as the protective agent and stabilizing agent, 4-mercaptobenzoic acid (4-MBA) was used as the Raman reporter to generate SERS signals as well as the conjugation agent for attaching CD44 antibody (anti-CD44) molecules to AuNSs, where anti-CD44 could effectively target to CD44 protein overexpressed cells. All the results of the experiments con¯rmed that more SERS probes have been targeted to cancer cells (A549 cells and H1229 cells) than that of normal cells (ATII cells) under the same condition. The anti-CD44 SERS probes hold a potential application in distinguishing cancer cells from normal cells with high sensitivity and good biocompatibility.
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.