| 1. |
- Cheng, Zhaoyang, et al.
(författare)
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Equalizer Zero-Determinant Strategy in Discounted Repeated Stackelberg Asymmetric Game
- 2024
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Ingår i: Journal of Systems Science and Complexity. - : Springer Nature. - 1009-6124 .- 1559-7067. ; 37:1, s. 184-203
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Tidskriftsartikel (refereegranskat)abstract
- This paper focuses on the performance of equalizer zero-determinant (ZD) strategies in discounted repeated Stackelberg asymmetric games. In the leader-follower adversarial scenario, the strong Stackelberg equilibrium (SSE) deriving from the opponents’ best response (BR), is technically the optimal strategy for the leader. However, computing an SSE strategy may be difficult since it needs to solve a mixed-integer program and has exponential complexity in the number of states. To this end, the authors propose an equalizer ZD strategy, which can unilaterally restrict the opponent’s expected utility. The authors first study the existence of an equalizer ZD strategy with one-to-one situations, and analyze an upper bound of its performance with the baseline SSE strategy. Then the authors turn to multi-player models, where there exists one player adopting an equalizer ZD strategy. The authors give bounds of the weighted sum of opponents’s utilities, and compare it with the SSE strategy. Finally, the authors give simulations on unmanned aerial vehicles (UAVs) and the moving target defense (MTD) to verify the effectiveness of the proposed approach.
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| 2. |
- Deng, Juan, et al.
(författare)
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Pose Synchronization of Multiple Rigid Bodies Under Average Dwell Time Condition
- 2018
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Ingår i: Journal of Systems Science and Complexity. - : Springer-Verlag New York. - 1009-6124 .- 1559-7067. ; 31:1, s. 215-233
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Tidskriftsartikel (refereegranskat)abstract
- This paper considers the pose synchronization problem of a group of moving rigid bodies under switching topologies where the dwell time of each topology may has no nonzero lower bound. The authors introduce an average dwell time condition to characterize the length of time intervals in which the graphs are connected. By designing distributed control laws of angular velocity and linear velocity, the closed-loop dynamics of multiple rigid bodies with switching topologies can be converted into a hybrid dynamical system. The authors employ the Lyapunov stability theorem, and show that the pose synchronization can be reached under the average dwell time condition. Moreover, the authors investigate the pose synchronization problem of the leader-following model under a similar average dwell time condition. Simulation examples are given to illustrate the results.
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| 3. |
- Hu, Jiangping, et al.
(författare)
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Optimal target trajectory estimation and filtering using networked sensors
- 2008
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Ingår i: Journal of Systems Science and Complexity. - : Springer Science and Business Media LLC. - 1009-6124 .- 1559-7067. ; 21:3, s. 325-336
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Tidskriftsartikel (refereegranskat)abstract
- Target tracking using distributed sensor network is in general a challenging problem because it always needs to deal with real-time processing of noisy information. In this paper the problem of using nonlinear sensors such as distance and direction sensors for estimating a moving target is studied. The problem is formulated as a prudent design of nonlinear filters for a linear system subject to noisy nonlinear measurements and partially unknown input, which is generated by an exogenous system. In the worst case where the input is completely unknown, the exogenous dynamics is reduced to the random walk model. It can be shown that the nonlinear filter will have optimal convergence if the number of the sensors are large enough and the convergence rate will be highly improved if the sensors are deployed appropriately. This actually raises an interesting issue on active sensing: how to optimally move the sensors if they are considered as mobile multi-agent systems? Finally, a simulation example is given to illustrate and validate the construction of our filter.
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| 4. |
- Jiangping, Hu, et al.
(författare)
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Cooperative shift estimation of target trajectory using clustered sensors
- 2014
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Ingår i: Journal of Systems Science and Complexity. - : Springer Science and Business Media LLC. - 1009-6124 .- 1559-7067. ; 27:3, s. 413-429
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a mathematical model for target tracking using nonlinear scalar range sensors is formulated first. A time-shift sensor scheduling strategy is addressed on the basis of a k-barrier coverage protocol and all the sensors are divided into two classes of clusters, active cluster, and submissive cluster, for energy-saving. Then two types of time-shift nonlinear filters are proposed for both active and submissive clusters to estimate the trajectory of the moving target with disturbed dynamics. The stochastic stability of the two filters is analyzed. Finally, some numerical simulations are given to demonstrate the effectiveness of the new filters with a comparison of EKF.
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| 5. |
- Jinhuan, Wang, et al.
(författare)
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Consensus control design for multi-agent systems using relative output feedback
- 2014
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Ingår i: Journal of Systems Science and Complexity. - : Springer Science and Business Media LLC. - 1009-6124 .- 1559-7067. ; 27:2, s. 237-251
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Tidskriftsartikel (refereegranskat)abstract
- This paper studies the consensus problem of multi-agent systems in which all agents are modeled by a general linear system. The authors consider the case where only the relative output feedback between the neighboring agents can be measured. To solve the consensus problem, the authors first construct a static relative output feedback control under some mild constraints on the system model. Then the authors use an observer based approach to design a dynamic relative output feedback control. If the adjacent graph of the system is undirected and connected or directed with a spanning tree, with the proposed control laws, the consensus can be achieved. The authors note that with the observer based approach, some information exchange between the agents is needed unless the associated adjacent graph is completely connected.
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| 6. |
- Li, Yibei, 1993-, et al.
(författare)
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Identifiability and Solvability in Inverse Linear Quadratic Optimal Control Problems
- 2021
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Ingår i: Journal of Systems Science and Complexity. - : Springer Nature. - 1009-6124 .- 1559-7067. ; 34:5, s. 1840-1857
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the inverse linear quadratic (LQ) problem over finite time-horizon is studied. Given the output observations of a dynamic process, the goal is to recover the corresponding LQ cost function. Firstly, by considering the inverse problem as an identification problem, its model structure is shown to be strictly globally identifiable under the assumption of system invertibility. Next, in the noiseless case a necessary and sufficient condition is proposed for the solvability of a positive semidefinite weighting matrix and its unique solution is obtained with two proposed algorithms under the condition of persistent excitation. Furthermore, a residual optimization problem is also formulated to solve a best-fit approximate cost function from sub-optimal observations. Finally, numerical simulations are used to demonstrate the effectiveness of the proposed methods.
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| 7. |
- Ljung, Lennart
(författare)
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Revisiting Total Model Errors and Model Validation
- 2021
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Ingår i: Journal of Systems Science and Complexity. - : SPRINGER HEIDELBERG. - 1009-6124 .- 1559-7067. ; 34:5, s. 1598-1603
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Tidskriftsartikel (refereegranskat)abstract
- The paper contains a discussion of earlier work on Total Model Errors and Model Validation. It is maintained that the recent change of paradigm to kernel based system identification has also affected the basis for (and interest in) giving bounds for the total model error.
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| 8. |
- Lou, Youcheng, et al.
(författare)
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Target aggregation of second-order multi-agent systems with switching interconnection
- 2012
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Ingår i: Journal of Systems Science and Complexity. - : Springer Science and Business Media LLC. - 1009-6124 .- 1559-7067. ; 25:3, s. 430-440
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the target aggregation is investigated for a multi-agent system consisting of second-order agents and multiple leaders. Sufficient conditions are proposed to make the agents approach the target set spanned by these moving leaders. With the condition on switching interconnection topologies, all mobile agents can asymptotically track the dynamical target set specified by multiple moving leaders with bounded error. Moreover, discussion on the case with static leaders is also given.
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| 9. |
- Lourenço, Inês, 1994-, et al.
(författare)
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Hidden Markov Models : Inverse Filtering, Belief Estimation and Privacy Protection
- 2021
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Ingår i: Journal of Systems Science and Complexity. - : Springer Nature. - 1009-6124 .- 1559-7067. ; 34:5, s. 1801-1820
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Tidskriftsartikel (refereegranskat)abstract
- A hidden Markov model (HMM) comprises a state with Markovian dynamics that can only be observed via noisy sensors. This paper considers three problems connected to HMMs, namely, inverse filtering, belief estimation from actions, and privacy enforcement in such a context. First, the authors discuss how HMM parameters and sensor measurements can be reconstructed from posterior distributions of an HMM filter. Next, the authors consider a rational decision-maker that forms a private belief (posterior distribution) on the state of the world by filtering private information. The authors show how to estimate such posterior distributions from observed optimal actions taken by the agent. In the setting of adversarial systems, the authors finally show how the decision-maker can protect its private belief by confusing the adversary using slightly sub-optimal actions. Applications range from financial portfolio investments to life science decision systems.
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| 10. |
- Takeuchi, Keigo, et al.
(författare)
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Performance analysis of optimal channel estimation and multiuser detection in a randomly-spread CDMA channel
- 2010
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Ingår i: Journal of Systems Science and Complexity. - : Springer Nature. - 1009-6124 .- 1559-7067. ; 23:1, s. 22-34
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Tidskriftsartikel (refereegranskat)abstract
- This paper analyzes performance of optimal channel estimation and multiuser detection (MUD) in a block-fading code-division multiple-access (CDMA) channel on the assumptions of random spreading and large-system limit, by using the replica method developed in statistical mechanics. The authors find that the asymptotic spectral efficiency of the linear minimum mean-squared error (LMMSE) MUD which was proposed and analyzed by Evans and Tse in 2000 is indistinguishable from that of the optimal MUD for small system loads. Our results imply that performance of MUD scarcely improves even if one spends more computational cost than that of the LMMSE MUD, i.e., at most the cube of the number of users, on the above-described conditions
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