| 1. |
- Hu, J., et al.
(author)
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Bipartite consensus strategies for coopetition networks
- 2014
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In: 2014 33rd Chinese Control Conference (CCC). - : IEEE Computer Society. - 9789881563842 ; , s. 1505-1510
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Conference paper (peer-reviewed)abstract
- Cooperation and competition are two typical interactional relationships in natural and engineering networked systems. Some interesting collective behaviors can emerge through local interactions within the networked systems. This paper focuses on the coexistence of competition and cooperation (i.e., coopetition) at the network level and, simultaneously, the collective dynamics on such coopetition networks. The coopetition network is represented by a directed signed graph. The interaction relationship between the agents on the coopetition network is described by a multi-agent system. We investigate two bipartite consensus strategies for the agents such that all the agents converge to a final state characterized by identical modulus but opposite sign. Under a weak connectivity assumption that the signed network has a spanning tree, some sufficient conditions are derived for bipartite consensus of multi-agent systems with the help of a structural balance theory. Finally, simulation results are provided to demonstrate the bipartite consensus formation.
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| 2. |
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| 3. |
- Thunberg, Johan, et al.
(author)
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Attitude consensus using networks of uncalibrated cameras
- 2014
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In: 2014 33rd Chinese Control Conference (CCC). - : IEEE Computer Society. - 9789881563842 ; , s. 1444-1451
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Conference paper (peer-reviewed)abstract
- This paper addresses the problem of consensus on SO(3) for networks of uncalibrated cameras. Under the assumption of a pinhole camera model, we prove convergence to the consensus manifold for two types of kinematic control laws, when only conjugate rotation matrices KRK-1 are available among the agents. In these conjugate rotations, the rotation matrices are distorted by the (unknown) intrinsic parameters of the cameras. For the conjugate rotations, we introduce distorted versions of well known local parameterizations of SO(3) and show consensus by using three types of control laws. The control laws are similar to the standard consensus protocol used for systems of agents with single integrator dynamics, where pairwise differences between the states of neighboring agents are used. By considering the restriction to the planar case (when all the rotations have the same rotational axes), we weaken the assumptions on the cameras in the system and consider networks where the camera matrices differ between agents.
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| 4. |
- Wang, J., et al.
(author)
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Modeling and simulating for congestion evacuation based on multi-agent approach
- 2014
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In: 2014 33rd Chinese Control Conference (CCC). - : IEEE Computer Society. - 9789881563842 ; , s. 6421-6426
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Conference paper (peer-reviewed)abstract
- A new multi-agent based congestion evacuation model is proposed in this paper to simulate the pedestrian evacuation process in stadium with or without obstacles, in which each agent's state can be normal, being overtaked and dead. In this model, all the pedestrians are divided into four kinds and each kind has six different classes of competitive ability. The individual action direction is affected by their competitive ability, the distance to the exits and the occupant number and density within the view field of the agent. In the simulation, we present the congestion and death phenomenon as well as the effects of obstacles in evacuation process. We also add a virtual leader to regulate the evacuation effectively. Simulation results show that the proposed model can reproduce exactly the real evacuation process in stadium.
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| 5. |
- Wu, X., et al.
(author)
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Anti-windup design for Active Disturbance Rejection Control
- 2014
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In: Proceedings of the 33rd Chinese Control Conference. - : IEEE Computer Society. - 9789881563842 ; , s. 2389-2395
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Conference paper (peer-reviewed)abstract
- An anti-windup compensate algorithm for active disturbance rejection mechanism is proposed in this paper. This paradigm extends the traditional anti-windup scheme to the Active Disturbance Rejection Control (ADRC) mechanism, to deal with the input saturation nonlinearity and meanwhile reject the disturbance automatically by using Extended State Observer (ESO). The output of anti-windup compensator is treated as a part of unknown disturbances and is introduced into the ESO, which can online observe both internal and external disturbances (parameter uncertainties and model mismatches). The controller input is yielded by using a nonlinear feedback combination, and it is used to compensate the integrator windup caused by the saturation nonlinearity element. On the other hand, in order to determine the parameters of the ESO and the anti-windup compensator feedback gain, the L2 gain is adopted. The effectiveness and the robustness against model and parameter uncertainties of the proposed method is verified by an example of the seeker platform.
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| 6. |
- Zhong, J., et al.
(author)
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Video quality improvement for multi-camera systems using camera control
- 2014
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In: Proceedings of the 33rd Chinese Control Conference, CCC 2014. - 9789881563842 ; , s. 1924-1931
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Conference paper (peer-reviewed)abstract
- Multiview video captured by a multi-camera system has been widely used in many applications such as environmental surveillance, industrial inspection and 3D television. A multiview video contains a vast amount of data required to be transmitted and/or stored, and therefore compression is essential. However, distortion or artifacts are usually witnessed in the reconstructed multiview video after a raw multiview video is compressed at a limited bit-rate. Previous results on video compression mainly focus on the refinements of compression algorithms to improve the quality of reconstructed multiview videos. This paper uses a camera control for video capture to improve the quality of reconstructed multiview videos at a limited bit-rate. Individual cameras are controlled to adjust their pan angles and focal lengths at the video acquisition stage to compensate for the difference in feature-point locations. The optimal pan angle and focal length are designed for each camera. Experimental results validate that the proposed method capturing with camera control outperforms the conventional method capturing without camera control and the heuristic method of 'keeping the object of interest in the image center'.
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