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Articles by Bo Li
Total Records ( 6 ) for Bo Li
  Bo Li , Xuening Chen , Bo Guo , Xinlong Wang , Hongsong Fan and Xingdong Zhang
  Microwave heating was applied to fabricate interconnective porous structured bodies by foaming as-synthesized calcium-deficient hydroxyapatite (Ca-deficient HA) precipitate containing H2O2. The porous bodies were sintered by a microwave process with activated carbon as the embedding material to prepare nano- and submicron-structured ceramics. By comparison, conventional sintering was used to produce microstructured ceramics. The precursor particles and bulk ceramics were characterized by transmission electron microscopy (TEM), dynamic light scattering, scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR) and mechanical testing. TEM micrographs and assessment of the size distribution showed that the needle-like precursor particles are on the nanoscale. SEM observation indicated that the ceramics formed by microwave sintering presented a structure of interconnective pores, with average grain sizes of ~86 and ~167 nm. XRD patterns and FTIR spectra confirmed the presence of carbonated biphasic calcium phosphate (BCP), and the mechanical tests showed that the ceramics formed by microwave sintering had a compressive strength comparable to that obtained by conventional methods. Rat osteoblasts were cultured on the three kinds of BCP ceramics to evaluate their biocompatibility. Compared with the microscale group formed by conventional sintering, MTT assay and ALP assay showed that nanophase scaffolds promoted cell proliferation and differentiation respectively, and SEM observation showed that the nanoscale group clearly promoted cell adhesion. The results from this study suggest that porous carbonated biphasic calcium phosphate ceramics with a nanostructure promote osteoblast adhesion, proliferation and differentiation. In conclusion, porous carbonated BCP ceramics with a nanostructure are simple and quick to prepare using microwaves and compared with those produced by conventional sintering, may be better bone graft materials.
  Hongjuan Yang , Bo Li and Weixiao Meng
  Physical-layer Network Coding (PNC) is an efficient approach that can improve the system spectrum efficiency by allowing two different nodes to transmit their information to a common node simultaneously which can save more time slot resource compared with Network Coding (NC). In this study, for the purpose of further improving the performance of cooperative networks, a new cooperative diversity scheme which combines Decode-and-forward (DF) protocol and physical-layer network coding, is proposed for a two-hop cooperative system with multiuser. In the proposed scheme, users broadcast their information using quadrature carriers simultaneously and the relay node employs decode-and-forward mode. To check its validity, the Bit Error Rate (BER) and throughput of the proposed scheme, under different propagation cases, are investigated and compared with that of traditional decode-and-forward. The simulation results reveal that the proposed scheme can effectively improve the system performances.
  Bo Li , Gang Wang , Hongjuan Yang and Rongkuan Liu
  Physical-layer Network Coding (PNC) has drawn so much attention of wireless communication researchers. However, most of the studies focused on symmetric Two-Way Relay Communication (TWRC) systems. In order to analyze the performance of PNC in asymmetric scenario, in this study, we classify TWRC systems with Rayleigh fading channels into five asymmetric cases according to different poor channel allocation. In each symmetric and asymmetric case, we provide the detailed signal transmission and processing progress. Then we simulate the Bit Error Rate (BER) performance of PNC either in symmetric or asymmetric cases. From the results, we know that the Phase Asymmetry-Uplink (PA-U) case is the worst and Downlink Channel Asymmetry (DCA) case is the best among the five asymmetric cases. We also conclude that poor uplink channels will provide more severe effect to the performance degradation caused by system asymmetry than poor downlink ones.
  Gongliang Liu , Wenjing Kang , Bo Li and Ya Liu
  The unique characteristics of the underwater acoustic communication channel, such as three dimensional volumes of the environment and the limited energy, make it necessary to design and develop new routing algorithms. In this study, we propose an innovative energy-efficient multi-hop routing scheme for three-dimensional sensor networks based on compressed sensing. During each frame, a randomly chosen subset of nodes participates in the sensing process instead of all nodes delivering their message to the Sink node. Every chosen node finds a tour to the Sink node. As the message travels through the tour, each node computes the product of its sensing data and a random weighted coefficient and adds value to the intermediate result received from the last node. Analysis and simulation results show that our proposed algorithms are able to give an accurate approximation of the monitoring field and prolong network lifetime.
  Bo Li , Tengfei Ding , Xiling Wang and Zhang Qi
  Rock fragmentation process by drilling rig is accomplished by the simultaneous effects of drill pipe rotation and axial downwards motions. Hydraulic chuck transfers engine power to drill pipe during the drilling and sampling process suchthatit’s one of the most important components of drilling rig. Chuck available on the market, design is not considered clamping force and drilling capacity matching, resulting in slipped drill, injury drill or chuck destruction. This study designs a maximum clamping diameter 73 mm hydraulic chuck, focuses on the interaction mechanism of the gripper slips and drill pipe. A model to simulate and optimize the clamp mechanism and slips has been developed by the finite element analysis method, conclude the structure of the optimal size of the hydraulic chuck. This research may be a better suggestion on resolving the problems of pipe damage and slipping down. The study method would also be a reference for the design of other kinds of chucks. A model to simulate and optimize rainwater-harvesting systems for irrigation has been developed.
  Sha Fu , Zhongli Liu , Hangjun Zhou , Dan Song and Bo Li
  The study proposed a multiple attribute decision making method based on grey relational analysis, for the multiple attribute decision making problems with the evaluation information given in the form of intuition trapezoidal fuzzy numbers. First, give the definition of intuitionistic fuzzy numbers and distance formula and then obtained the grey relational coefficient about intuition trapezoidal fuzzy numbers based on grey relational analysis, to calculate the relational grade of each options by using relational coefficient and sort all the options by the size of this value in order to get the best option. Finally, it verified the feasibility and effectiveness of the proposed method through a numerical example.
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