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| 1 | Sewage flow optimization algorithm for large-scale urban sewer networks based on network community division显示文摘By considering the flow control of urban sewer networks to minimize the electricity consumption of pumping stations, a decomposition-coordination strategy for energy savings based on network community division is developed in this paper. A mathematical model characterizing the steady-state flow of urban sewer networks is first constructed, consisting of a set of algebraic equations with the structure transportation capacities captured as constraints. Since the sewer networks have no apparent natural hierarchical structure in general, it is very difficult to identify the clustered groups. A fast network division approach through calculating the betweenness of each edge is successfully applied to identify the groups and a sewer network with arbitrary configuration could be then decomposed into subnetworks. By integrating the coupling constraints of the subnetworks, the original problem is separated into N optimization subproblems in accordance with the network decomposition. Each subproblem is solved locally and the solutions to the subproblems are coordinated to form an appropriate global solution. Finally, an application to a specified large-scale sewer network is also investigated to demonstrate the validity of the proposed algorithm. | Lihui CEN Yugeng XI | 2008 | 控制理论与应用(英文版)2008，6，4： | 1 |
| 2 | A new approach of conditions on δ_(2s)(Φ) for s-sparse recovery显示文摘In this paper,we provide a unified expression to obtain the conditions on the restricted isometry constantδ2s(Φ).These conditions cover the important results proposed by Candes et al.and each of them is a sufficient condition for sparse signal recovery.In the noiseless case,whenδ2s(Φ)satisfies any one of these conditions,the s-sparse signal can be exactly recovered via(l1)constrained minimization. | CEN YiGang ZHAO RuiZhen MIAO ZhenJiang CEN LiHui CUI LiHong | 2014 | Science China(Information Sciences)2014，57，4： | 1 |
| 3 | Lyapunov-based boundary feedback control in multi-reach canals显示文摘This paper presents a Lyapunov-based approach to design the boundary feedback control for an open-channel network composed of a cascade of multi-reach canals,each described by a pair of Saint-Venant equations. The weighted sum of entropies of the multi-reaches is adopted to construct the Lyapunov function. The time derivative of the Lyapunov function is expressed by the water depth variations at the gate boundaries,based on which a class of boundary feedback controllers is presented to guarantee the local asymptotic closed-loop stability. The advantage of this approach is that only the water level depths at the gate boundaries are measured as the feedback. | CEN LiHui XI YuGeng | 2009 | Science in China(Series F)2009，52，7： | 1 |
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