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- 저자 : Songyang Li (검색결과 5 건)
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An Ant Colony based Routing Algorithm for Wireless Sensor Network
Xiaodong Liu,Songyang Li,Miao Wang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.6
Wireless sensor network (WSN) is a new research area of computer science and technology and has a wide application future,more and more attention. It will be much market in application of military, health, home, environment, etc. In WSN, sensor devices have limited supply of energy. The sensor death due to dissipating battery energy is one of the fundamental design issues in WSNs. Hence, energy efficiency is argued to be the most important requirement for WSN. Aiming at the limitation of energy of wireless sensor network node, this paper presents a routing algorithm which is based on the ant’s capability of finding the best paths between a food source and their nests. The pheromone and the energy of the node and delay of the node were combined to affect the pheromone concentration in optimization.Simulation results show that it can balance energy consumption between nodes and prolong the lifecycle of the whole network.
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Neutronic design and evaluation of the solid microencapsulated fuel in LWR
Deng Qianliang,Li Songyang,Wang Dingqu,Liu Zhihong,Xie Fei,Zhao Jing,Liang Jingang,Jiang Yueyuan 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
Solid Microencapsulated Fuel (SMF) is a type of solid fuel rod design that disperses TRISO coated fuel particles directly into a kind of matrix. SMF is expected to provide improved performance because of the elimination of cladding tube and associated failure mechanisms. This study focused on the neutronics and some of the fuel cycle characteristics of SMF by using OpenMC. Two kinds of SMFs have been designed and evaluated - fuel particles dispersed into a silicon carbide matrix and fuel particles dispersed into a zirconium matrix. A 7x7 fuel assembly with increased rod diameter transformed from the standard NHR200-II 9x9 array was also introduced to increase the heavy metal inventory. A preliminary study of two kinds of burnable poisons (Erbia & Gadolinia) in two forms (BISO and QUADRISO particles) was also included. This study found that SMF requires about 12% enriched UN TRISO particles to match the cycle length of standard fuel when loaded in NHR200-II, which is about 7% for SMF with increased rod diameter. Feedback coefficients are less negative through the life of SMF than the reference. And it is estimated that the average center temperature of fuel kernel at fuel rod centerline is about 60 K below that of reference in this paper
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Tan Long,Li Songyang,Zhao Liangyin,Wang Lulu,Zhao Xiuxiu 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11
This study employs the microshear test method to examine the local mechanical properties of narrow-gap welded joints, revealing the mechanical inhomogeneity by evaluating the microshear strength, stress‒strain curves, and failure strain. On this basis, the influence of weld joints micromechanical inhomogeneity on the crack tip opening displacement (CTOD) fracture toughness is investigated. From the root weld layer to the cover weld layer, the fracture toughness at the center of the weld seam demonstrates an increasing trend, with the experimental and calculated CTOD values showing a good correspondence. The microproperties of the welded joints significantly impact the load-bearing capacity and fracture toughness. During the deformation process of the “low-matching” microregions, the plastic zone expansion is hindered by the surrounding microregion strength constraints, thus reducing the fracture toughness. In contrast, during the deformation of the “high-matching” microregions, the surrounding microregions absorb some of the loading energy, partially releasing the concentrated stress at the crack tip, which in turn increases the fracture toughness.
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GMPG: A Geometric Multipath Generating Method in Software-Defined Service Overlay Network
Yunchong Guan,Weimin Lei,Wei Zhang,Yuzhuo Zhan,Hao Li,Songyang Zhang 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1
Multipath diversity (MPD) significantly impacts multipath transmission quality. Enough MPD helps improve concurrent link utilization and weaken negative impacts from a single path, thus improves abilities of congestion and failure tolerance. However, MPD is hard to guarantee on overlay networks because of little awareness of underlay network and few evaluation methods. In this paper, we design a multidimension orchestration view and propose a geometric multipath generating (GMPG) method. Overlay nodes are orchestrated in a two-dimension, i.e., intra-AS and inter-AS dimensions, view to enhance the awareness of underlay networks. Firstly, we generate coordinate-based views independently in each autonomous system. Then independent views are merged by embedding predicted switch points. The GMPG method evaluates and improves MPD from a novel perspective. Considering that MPD could be characterized by node diversity (ND), we impose some geometric mechanisms on the view to convert ND to MPD, including Transmission Direction to facilitate path convergence, Transmission Surface to reduce search complexity and Deviation Angle to evaluate link diversity. GMPG is conducted on the control plane of software-defined service overlay network both in inter-AS and intra-AS phases to establish end-to-end multiple paths. Experiments demonstrate that GMPG guarantees MPD better and the transmission quality is improved.
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