Shengyu Li

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This paper investigates the spectrum sensing and data transmission tradeoff problem for Cognitive Radio Networks (CRNs). In this paper, both the spectrum sensing time and the data transmission power are optimized. First, as the original problem is hard to analyze, an approximate problem is proposed, and it has been proved that there indeed exists an optimal(More)
Energy harvesting is gaining increasing importance for complementing the current battery-powered wireless communication systems, prolonging their lifetime and making them more environment friendly. Moreover, applying energy harvesting techniques to cognitive radio network (CRN) can improve both energy efficiency and spectral efficiency. In this paper, we(More)
In this letter, cooperative multicast in cognitive relay systems is investigated, where multiple multi-antenna relay nodes help forward the transmitted message from different sources to the corresponding destinations. Our objective is to maximize the global transmission rate scaling factor by cooperatively optimizing the forwarding matrix for each relay(More)
To analyze the exopolysaccharide (EPS) production by Streptococcus thermophilus ST1, cultures were cultivated in 10% (w/v) reconstituted skim milk under different growth conditions including various temperatures and pHs of growth medium, supplementation of the medium with various carbon sources (glucose, lactose, sucrose, galactose and fructose) and(More)
Lactobacillus plantarum strains isolated and identified from naturally-fermented Chinese sauerkraut were examined in vitro for potential probiotic properties and in vivo for cholesterol-lowering effect in mice. Among 7 isolated L. plantarum strains, strains S2-5 and S4-1 were found to possess desirable probiotic properties including ability to survive at pH(More)
MiR-29c is frequently dysregulated in many cancers; however, the roles of miR-29c in pancreatic cancer (PC) and underlying mechanisms remain poorly understood. In this study, we investigated the role of miR-29c in PC. Using quantitative real-time polymerase chain reaction, we demonstrated that miR-29c was frequently downregulated in clinical PC tissues and(More)