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- 저자 : Dai Jiancheng (검색결과 3 건)
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Unified Error Probability Analysis for Error Correcting Codes with Different Decoding Algorithms
Liyun Dai,Wenyuan Rao,Shuying Huang,Yingjun Tang,Yong Yang,Jiancheng Sun 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.2
The error rate of error correcting codes with soft-decision-decoding rarely has a closed-form expression. Bounding techniques are widely used to evaluate the performance of maximum-likelihood decoding algorithm. But the existing bounds are not tight enough especially for a low signal-to-noise ratios region and become looser when a suboptimum decoding algorithm is used. The radius of decision region is applied to evaluate the word error rate (WER) of error correcting codes with different decoding algorithms. Simulation results show that this method can effectively evaluate the WER of different decoders with 0.05dB maximum error.
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Prescribed-time Group Consensus for Multiagent System Based on a Distributed Observer Approach
Lingfei Dai,Xin Chen,Liuxiao Guo,Jiancheng Zhang,Jing Chen 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.10
The prescribed-time observer-based control for the group consensus problems of multi-agent systems is first investigated in this paper. Distributed observers are designed to estimate the state information in any predefined time of physical allowance when the agent is assumed to be not available or unmeasurable. The prescribed-time control protocols including a group projective parameter are presented to achieve group consensus within a predetermined time, which is independent of system parameters and initial values. Based on algebraic graph theory, Lyapunov stability and matrix theory, sufficient conditions of the designed parameters are established to realize prescribed time group consensus under both undirected and directed topology networks. The effectiveness of the proposed approaches is confirmed by simulation verification.
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Chen Zhipeng,Luo Feng,Zeng Jingwei,Dai Jiancheng,Zhou Guanghuai,Li Ruijie 한국해양과학기술원 2023 Ocean science journal Vol.58 No.1
Salt marshes are now known to improve coastal safety by attenuating waves and stabilizing the bed. Meanwhile, for salt marsh conservatin and restoration, a great deal of research has been done on the establishment mechanism of vegetation in salt marshes. However, research on the efects of hydrodynamic disturbance on the development of salt marsh vegetation is limited. The purpose of this paper is to investigate how the hydro-morphodynamic process afects the establishment and expansion of plants in salt marshes and to simulate the establishment process. First, we used a 2D fnite-element model to simulate hydro-morphodynamics in the selected tidal fat in Jiangsu, China. We then defned the variables describing the frequency and magnitude of hydrodynamic disturbance and quantifed the efects of disturbance on plant establishment using Spearman correlation coefcients. Finally, the vegetation development process was further analyzed using a logistic regression model, and the vegetation development in the study area was simulated from 2017 to 2021. The results show that salt marsh vegetation colonization has a relatively high correlation with fooding time and bed shear stress (ρ>0.6), and bed shear stress is the main hydrodynamic disturbance parameter limiting further expansion of salt marsh vegetation. The method combining hydrodynamic modeling and logistic regression has the potential to be used to identify hydrodynamic disturbances in future salt marsh restoration and management processes and to help design appropriate restoration measures.
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