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Articles by Yuzhen Liu
Total Records ( 2 ) for Yuzhen Liu
  Yuzhen Liu and Shoufu Li
  For Global Optimization Problems (GOPs), we propose a new variant of DE with linear neighborhood search, called LiNDE which employs a linear combination of triple vectors taken randomly from evolutionary population, in order to improve the ability of neighborhood search of Differential Evolutionary (DE) algorithm. The main characteristics of LiNDE are less parameters and powerful neighborhood search ability. Experimental studies are carried out on a benchmark set and the results show that LiNDE significantly improves the performance of DE.
  Yuzhen Liu , Xia Zhang , Chao Chen , Guobin Zhang , Pengshou Xu , Dapeng Chen and Lijun Dong
  SiCN thin films were prepared by high-dosage (2 x 1017 cm- 2) C+ ion implantation into α-SiNx:H films. The prepared films were then processed by thermal annealing for 2 h at 800 °C, 1000 °C and 1200 °C respectively. The composition and bond structure of SiCN were analyzed by X-ray photoemission spectroscopy, Auger electron spectroscopy, Raman spectroscopy and X-ray diffraction, and photoluminescence. Ternary structure with N bridging C and Si of the film annealed at 800 °C was found. The luminescent properties of SiCN have also been studied by synchrotron radiation at 20 K. Four emission bands were observed, corresponding to 2.95, 2.58, 2.29 and 2.12 eV at 20 K, respectively. In this paper, we report the experimental results and try to explain them.
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