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- 저자 : Zhu Youming (검색결과 5 건)
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Zhu Youming 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.1
It is an inevitable trend for business associations to participate in social governance and provide social services. But at present, the ability of business associations to provide services is not strong, and their social credibility is not high. Thus it is urgent to improve the governance capacity of them. On the basis of literature review and expert interview, this paper builds up a concept model and puts forward hypotheses. Research result from the analysis of 172 valid questionnaires shows that resources access ability and six other factors would influence the governance capacity of business associations in China. The research result attempts to provide reference for the Chinese government and business associations to take corresponding measures to improve the effectiveness of governance.
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Zhu Youming 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3
Supported by the spatial information technologies (SIT), this paper builds a database by integrating multi-source data like RS, spatial survey, economic statistics, etc., accomplishes the planning of ecological pattern of industrial technology innovation strategic alliance in gulf of Hangzhou area, and presents the strategies of constructing the operation mechanism of the industrial technology innovation strategic alliance in a bid to provide basis for the decision making of enhancing the innovation abilities of Chinese enterprises in this area.
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Hypergraph Game Theoretic Solutions for Load Aware Dynamic Access of Ultra-dense Small Cell Networks
( Xucheng Zhu ),( Yuhua Xu ),( Xin Liu ),( Yuli Zhang ),( Youming Sun ),( Zhiyong Du ),( Dianxiong Liu ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2
A multi-channel access problem based on hypergraph model in ultra-dense small cell networks is studied in this paper. Due to the hyper-dense deployment of samll cells and the low-powered equipment, cumulative interference becomes an important problem besides the direct interference. The traditional binary interference model cannot capture the complicated interference relationship. In order to overcome this shortcoming, we use the hypergraph model to describe the cumulative interference relation among small cells. We formulate the multi-channel access problem based on hypergraph as two local altruistic games. The first game aims at minimizing the protocol MAC layer interference, which requires less information exchange and can converge faster. The second game aims at minimizing the physical layer interference. It needs more information interaction and converges slower, obtaining better performance. The two modeled games are both proved to be exact potential games, which admit at least one pure Nash Equilibrium (NE). To provide information exchange and reduce convergecne time, a cloud-based centralized-distributed algorithm is designed. Simulation results show that the proposed hypergraph models are both superior to the existing binary models and show the pros and cons of the two methods in different aspects.
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Design and Numerical Study of Hybrid Magnetic Source Disc-type Magnetorheological Valve
Xiaolong Yang,Yan Li,Youming Zhou,Shiying Zhou,Jiehong Zhu 한국자기학회 2023 Journal of Magnetics Vol.28 No.2
Magnetorheological valves are important components in hydraulic systems that provide precise position control. At present, the low-pressure drop performance of magnetorheological valves is the main problem limiting their application. To improve the pressure drop performance of magnetorheological valves, a hybrid magnetic source disc magnetorheological valve is proposed. The magnetic pressure drop model and viscous pressure drop model of the hybrid magnet source disc type magnetorheological valve based on the Bingham model are Derived. Magnetic field distributions in the damping channel of the hybrid magnet source disc type magnetorheological valve are obtained by using ANSYS finite element analysis software. The mathematical model of the relationship between pressure drop and magnetic induction intensity was established using Matlab software, and the effects of parameters such as effective current, axial damping gap, radial damping gap, and coil width on the pressure drop performance of disc-type magnetorheological valves with hybrid magnetic sources were numerically analyzed. The results show that the pressure drop of the disc magnetorheological valve with a hybrid magnetic source can reach 10.9935 MPa at the current I=3A, axial damping gap ga=1 mm, and radial damping gap gr=1.5 mm. Compared with the conventional disc magnetorheological valve, the pressure drop performance of the hybrid magnetic source disc magnetorheological valve is improved by 28 %, which provides ideas on how to improve the pressure drop performance of the magnetorheological valve.
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Design and Performance Study of Hybrid Channel-valved Magnetorheological Dampers
Yan Li,Xiaolong Yang,Jiehong Zhu,Youming Zhou 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
In order to solve the problem of low damping force caused by low utilization of magnetic field in traditional magnetorheological dampers, a hybrid channel valve type magnetorheological damper with circular channel and disk channel are proposed. The main content of this paper is to design the basic structure of mixed channel valve magnetorheological damper. The mathematical model of damping force based on Bingham plastic model was established from the design of magnetic circuits. The two-dimensional simulation model of MR Damper was established by using EMAG module in ANSYS finite element analysis software, and the magnetic circuit of mixed channel valve MR Damper was simulated and analyzed. The results show that the output damping force of the hybrid channel valve-type magnetorheological damper is 18 KN and the adjustable coefficient is 14.52 with the current I of 3A, the number of coil turns of 560, the axial damping gap of 1 mm and the radial damping gap of 1.5 mm.
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