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Novel Local Community Detection Algorithm Based on Contribution of Common Neighbor Nodes
Tianhong Wang,Xing Wu,Wangsen Lan 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11
Most of the local community detection algorithms based on node similarity often simply count the number of common neighbors as the basis of selecting members of the community that cannot accurately measure the value of a common neighbor node in the information transmission of nodes. For this, we use the new concept of a common neighbor contribution; borrowed from the idea about the local modularity, put forward a new fast community detection algorithm. The algorithm accurately selects candidate nodes to join the community, according to the contribution of the common neighbor node, also without calculating local modularity for each common neighbor node, and greatly improved the accuracy and efficiency in merging Members. the experimental results of the computer-generated network and the real networks verified reliability and efficiency of the algorithm.
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Peitao Wang,Tianhong Yang,Tao Xu,Meifeng Cai,Changhong Li 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.4
It is of great importance to study the failure process and scale effect of jointed rock mass in the field of rock mechanics and mining engineering. In the present paper, initially the uniaxial compression test on granite was performed and acoustic emission (AE) sequence was acquired during the compression process in laboratory. Results from numerical simulations using the particle flow code in two dimensions (PFC2D) were presented, and compared with experimental measurements. It was observed that the approach was reasonably good in predicting the real response of granite rock samples. The mechanical parameter of joint model was then calibrated based on PFC2D model with experimental results. Finally the mechanical properties of complex rocks with discrete fracture network (DFN) were studied and scale effects on the elasticity and strength were then investigated. The result showed that the failure pattern was similar when the ratio of joint contact bond strength (both shear and normal) to rock contact bond strength was in the range of 3~9%. The elastic modulus and strength parameters were changed with the sizes of rock sample for DFN models. Moreover, the variation of rock failure pattern under different sizes was also studied and finally the representative elementary volume (REV) size of the considered rock mass was estimated to be 9 × 9 m. It is suggested that the failure pattern analysis should be considered in the REV study of jointed rock mass.
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Peitao Wang,Meifeng Cai,Fenhua Ren,Changhong Li,Tianhong Yang 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2
Anisotropy is one of the most distinct features of stratified rock mass and it must be considered in engineering design and stability analysis. On the basis of linear elastic theory and displacements equivalence, a computational model considering elastic anisotropy was established. The equivalent elastic modulus and equivalent Poisson’s ratio of the stratified rock perpendicular and parallel to the loading direction were discussed. The relations of material properties and geometry parameters with the equivalent elastic modulus and equivalent Poisson’s ratio in two directions were studied. Uniaxial compressive test was conducted and the elastic modulus and Poisson’s ratio in the proposed model agreed well with experimental results. The comparison between a comprehensive set of experimental data and theoretical analysis data proves that the proposed constitutive model can effectively characteristic the mechanical behavior of stratified rocks. The proposed model can consider the effects of material parameters and geometry parameters of rock and joints on the mechanical behavior of stratified rock mass. Moreover, the elastic anisotropy was considered in the model. Thus, the model can supply some valuable reference in studying deformation of stratified rock mass and engineering design.
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Dynamic optimization of robot arm based on flexible multi-body model
Mingxuan Liang,Binrui Wang,Tianhong Yan 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
This paper examines the effect mechanism of torsional stiffness on flexible joints and the dynamic optimization of a six Degree-offreedom industrial robot arm. The design optimization of the robot arm is investigated based on the rotor-torsional spring model and finite element method. The flexible multi-body dynamic model of the robot arm are established by considering the flexible characteristics of arms and joints, and the natural frequencies of a robot arm are calculated to obtain the torsional stiffness of the flexible joints. Natural frequency results gradually increased with joint stiffness improvement. Using the established dynamic model, the topology optimization on the robot arm is carried out by regarding lightweight as design goal and total displacement as constraints. The tare-load ratio and dynamic performance of the optimized robot arm are significantly enhanced compared with the original design model. This research can provide the theoretical basis for the dynamic optimization and upgrade of lightweight robot arm.
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Xiao, Peng,Shin, Kwang-Soo,Wang, Tianhong,Yu, Jae-Hyuk American Society for Microbiology 2010 EUKARYOTIC CELL Vol.9 No.11
<B>ABSTRACT</B><P>The opportunistic human pathogen Aspergillus fumigatus reproduces asexually by forming a massive number of mitospores called conidia. In this study, we characterize the upstream developmental regulator A. fumigatus<I>flbB</I> (<I>AfuflbB</I>). Northern blotting and cDNA analyses reveal that <I>AfuflbB</I> produces two transcripts predicted to encode two basic leucine zipper domain (bZIP) polypeptides, <I>Afu</I>FlbBβ (420 amino acids [aa]) and <I>Afu</I>FlbBα (390 aa). The deletion of <I>AfuflbB</I> results in delayed/reduced sporulation, precocious cell death, the lack of conidiophore development in liquid submerged culture, altered expression of <I>AfubrlA</I> and <I>AfuabaA</I>, and blocked production of gliotoxin. While introduction of the wild-type (WT) <I>AfuflbB</I> allele fully complemented these defects, disruption of the ATG start codon for either one of the <I>Afu</I>FlbB polypeptides leads to a partial complementation, indicating the need of both polypeptides for WT levels of asexual development and gliotoxin biogenesis. Consistent with this, Aspergillus nidulans<I>flbB</I><SUP><I>+</I></SUP> encoding one polypeptide (426 aa) partially complements the <I>AfuflbB</I> null mutation. The presence of 0.6 M KCl in liquid submerged culture suppresses the defects caused by the lack of one, but not both, of the <I>Afu</I>FlbB polypeptides, suggesting a genetic prerequisite for <I>Afu</I>FlbB in A. fumigatus development. Finally, Northern blot analyses reveal that both <I>AfuflbB</I> and <I>AfuflbE</I> are necessary for expression of <I>AfuflbD</I>, suggesting that FlbD functions downstream of FlbB/FlbE in aspergilli.</P>
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