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ANALYSIS OF TIME VARYING SYSTEMS USING TIME VARYING S-TRANSFORMS AND TIME VARYING Z-TRANSFORMS
IFAC Proceedings Volumes, 2002Abstract This paper deals with the analysis of continuous and discrete time varying systems using two unusual representations. These representations, based on time varying s-transform and time-varying z -transform notions, prove to be highly efficient in the field of automatic control.
Aitor GARCIA ITURRICHA +2 more
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Representation of Time-Varying Nonlinear Systems With Time-Varying Principal Dynamic Modes
IEEE Transactions on Biomedical Engineering, 2007System identification of nonlinear time-varying (TV) systems has been a daunting task, as the number of parameters required for accurate identification is often larger than the number of data points available, and scales with the number of data points.
Yuru Zhong +3 more
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Semantics of time-varying information
Information Systems, 1996Abstract This paper provides a systematic and comprehensive study of the underlying semantics of temporal databases, summarizing the results of an intensive collaboration between the two authors over the last five years. We first examine how facts may be associated with time, most prominently with one or more dimensions of valid time and ...
Christian S. Jensen +1 more
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Robustness of Time-Varying Systems [PDF]
Volume 1C: 16th Biennial Conference on Mechanical Vibration and Noise, 1997 Abstract The dynamics of many mechanical systems can be described, or approximated by smooth vector fields in d-dimensional space Rd. External and internal excitations as well as modeling uncertainties are incorporated in the vector fields as families of (time-varying) functions, possibly with their own dynamics.
Colonius, Fritz, Kliemann, Wolfgang
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Time-varying evoked potentials
Journal of Medical Engineering & Technology, 1994In an important subset of surgical procedures, the procedure itself poses a significant threat to the patient's nervous system. In order to reduce this threat, neurophysiological function of the structures at risk may be monitored during surgery using time-locked sensory or motor-evoked responses.
D, Krieger, R J, Sclabassi
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2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017
We consider the problem of inferring the hidden structure of high-dimensional time-varying data. In particular, we aim at capturing the dynamic relationships by representing data as valued nodes in a sequence of graphs. Our approach is motivated by the observation that imposing a meaningful graph topology can help solving the generally ill-posed and ...
Kalofolias, Vassilis +3 more
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We consider the problem of inferring the hidden structure of high-dimensional time-varying data. In particular, we aim at capturing the dynamic relationships by representing data as valued nodes in a sequence of graphs. Our approach is motivated by the observation that imposing a meaningful graph topology can help solving the generally ill-posed and ...
Kalofolias, Vassilis +3 more
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The Time-Varying Beveridge Curve [PDF]
, 2014 We use a Bayesian time-varying parameter structural VAR with stochastic volatility to investigate changes in both the reduced-form relationship between vacancies and the unemployment rate, and in their relationship conditional on permanent and transitory output shocks, in the post-WWII United States. Evidence points towards similarities and differences
Luca Benati, Thomas A. Lubik
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Controllability of Time-varying Oligopolies
The Fourth International Conference on Control and Automation 2003 ICCA Final Program and Book of Abstracts ICCA-03, 2003This paper examines the controllability of dynamic oligopoly models. Both discrete and continuous time scales are considered, and sufficient and necessary conditions are derived for the complete controllability of the outputs of the fims.
S. Molnar, F. Szidarovsky, M. Molnar
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Stability of time-varying switched systems with time-varying delay
Nonlinear Analysis: Hybrid Systems, 2009The author first gives a generalization of Halanay's inequality, and then uses this inequality to obtain sufficient conditions for the stability of the following switched delay system \[ x'(t)=A_{\sigma_i}(t)x(t)+B_{\sigma_i}(t)x(t-\tau(t))+\int_{t_0}^t f_{\sigma_i}(t-s)x(s)ds, \] where \[ x(t)\in \mathbb R^n, A_{\sigma_i}(t), B_{\sigma_i}(t)\in ...
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On Time Varying Undirected Graphs
2018The time-varying multivariate Gaussian distribution and the undirected graph associated with it, as introduced in Zhou et al. (2008), provide a useful statistical framework for modeling complex dynamic networks. In many application domains, it is of high importance to estimate the graph structure of the model consistently for the purpose of scientific ...
Mladen Kolar, Eric P. Xing
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