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Articles by Li Feng
Total Records ( 3 ) for Li Feng
  Li Feng and Li-Quan Sun
  In the algorithm of Kohonen’s Self-Organizing Maps (SOM) at the beginning of cluster, the number of input vectors in training set has to be settled down, which leads to the bad flexibility and is against the unsupervised principle. Also the fixed output network structure will lead to over-use or lack-of-use to the neuron node. To improve the exist defect of SOM and at the same time keep its advantages, an enhanced dynamic self organizing maps algorithm is proposed. This new method based on the idea of classical Growing Hierarchical Self-organizing Map (GHSOM), take advantage of GHSOM’s feature of self determine the structure reflects the variability of data. By put forward a new cycle network structure EDSOM overcome the limitation of neutron under-utilize and over-utilize caused by the boundary effect. The experiment of intrusion detection proved the efficiency of the algorithm.
  Hui Liu , Jin-Lei Tian , Wen Gu , Ying-Ying Kou , Li Feng , Xiao-Fang Ma , Dong-Dong Li , Shi-Ping Yan and Dai-Zheng Liao
  An oxamato-bridged heterobinuclear NiIICuII complex [Ni(cyclam)Cu(opba)]2 · 3DMSO (1) has been synthesized, characterized by elemental analysis, infrared spectra and magnetic susceptibility, where cyclam is 1, 4, 8, 11-tetraazacyclotetradecane and opba is o-phenylenebis(oxamato). The complex crystallizes in the triclinic system, space group P1 with a = 12.006(3) Aring, b = 12.783(3) Aring, c = 20.977(5) Aring, agr = 76.634(4)°, β = 75.172(4)°, γ = 80.818(4)° and Z = 2. According to X-ray crystallographic studies, the four-coordinate copper(II) atom is a slightly distorted planar geometry and is linked to nickel(II) through the exo-cis oxygen atoms of [Cu(opba)]2-; the six-coordinate nickel(II) center lies in a highly distorted octahedral environment. Magnetic susceptibility measurements of the complex in the temperature range 2-300 K indicate that the heterobinuclear NiIICuII units are coupled antiferromagnetically with J = -57.38 cm-1, gNi = 2.25 and gCu = 2.02.
  Pei-Pei Yang , Li Feng , Wen Gu , Xin Liu and Shi-Ping Yan
  A 1D complex [lcub[Cu2([12]aneN3)2(p-paa)(H2O)2](ClO4)2rcub[Cu2([12]aneN3)2(p-paa)2]]n ([12]aneN3 = 1,5,9-triazacyclododecane, p-paa = p-benzenebicarboxylate) has been synthesized and structurally characterized. The complex contains two different binuclear copper(II) moieties. One part includes a binuclear copper(II) unit and non-coordinated perchlorate anions. A neutral binuclear copper(II) part which forms a zigzag chain structure via the bridging p-paa ligand completes the unit-cell. Elemental analysis, IR, UV-Vis spectra and magnetic properties for the complex have also been determined. Magnetic susceptibilities in the solid state are measured over the temperature range from 77 to 300 K, showing a weak antiferromagnetic coupling with a best fit J1 = -3.09 cm-1, J2 = -5.279 cm-1, g = 2.099 and R = 1.226 times 10-5.
 
 
 
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