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A New Genetic Algorithm-based Topology Optimization Method of Tensegrity Tori
Shuo Ma,Xing-Fei Yuan,Sheng-Da Xie 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
This study mainly focuses on a new Genetic Algorithm (GA)-based topology optimization method of tensegrity tori with the ring stiffness set as the optimization objective. To do the structural analysis of self-equilibrated tensegrity tori, a modified stiffness matrix based form-finding method is introduced. A form finding procedure is adopted to generate new tensegrity tori in constant mass with only topology and rest length given. An innovative encoding scheme in GA is proposed to represent tensegrity tori with new sets of topology, prestress, and configuration. Numerical examples demonstrate that the proposed method is efficient in the topology optimization of tensegrity tori with high ring stiffness.
( Kun Yang ),( Xing Zhang ),( Shuo Wang ),( Lin Wang ),( Wenbo Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8
In heterogeneous networks (HetNets), energy saving is vital for a sustainable network development. Many techniques, such as spectrum allocation, network planning, etc., are used to improve the network energy efficiency (EE). In this paper, micro BSs utilizing cell range expansion (CRE) and spectrum allocation are considered in multi-channel heterogeneous networks to improve EE. Hotspot region is assumed to be covered by micro BSs which can ensure that the hotspot capacity is greater than the average demand of hotspot users. The expressions of network energy efficiency are derived under shared, orthogonal and hybrid subchannel allocation schemes, respectively. Particle swarm optimization (PSO) algorithm is used to solve the optimal ratio of subchannel allocation in orthogonal and hybrid schemes. Based on the results of the optimal analysis, we propose three service control strategies on the basis of large-scale user behaviors, i.e., adjust micro cell rang expansion (AmCRE), adjust micro BSs density (AmBD) and adjust micro BSs transmit power (AmBTP). Both theoretical and simulation results show that using shared subchannel allocation scheme in AmBD strategies can obtain maximal EE with a very small area ratio. Using orthogonal subchannel allocation scheme in AmCRE strategies can obtain maximal EE when area ratio is larger. Using hybrid subchannel allocation scheme in AmCRE strategies can obtain maximal EE when area ratio is large enough. No matter which service control strategy is used, orthogonal spectrum scheme can obtain the maximal hotspot user rates.
Rizhi Chen,Shuo Hu,Xiang Zhang,Zhengyan Qu,Hong Jiang,Yefei Liu,Jun Huang,Weihong Xing 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
"The deactivation mechanism of Pd@CN catalyst in the liquid-phase phenol hydrogenation was investigated by designing many experiments. The phenol conversion decreased by 40% through five reaction cycles. The catalyst deactivation could be mainly ascribed to the surface coverage and the pore blockage with organic matters including cyclohexanone and other derivatives. Three after-treatment methods, i.e., water washing, drying and storing in water, strongly affected the catalytic activity of Pd@CN. After the reaction, by storing the recovered Pd@CN catalyst in water, its catalytic performance could be maintained. These findings provide in-depth insights on the deactivation and recycling of Pd@CN catalyst."