A5065643877- Stability and Control of Uncertain Systems
- Advanced Control Systems Optimization
- Control Systems and Identification
- Evolution and Genetic Dynamics
- Distributed Control Multi-Agent Systems
- Distributed Sensor Networks and Detection Algorithms
- Evolutionary Game Theory and Cooperation
- Game Theory and Applications
- Age of Information Optimization
- Mathematical and Theoretical Epidemiology and Ecology Models
- Advanced Optimization Algorithms Research
- Gene Regulatory Network Analysis
- Fault Detection and Control Systems
- Target Tracking and Data Fusion in Sensor Networks
- Advanced Queuing Theory Analysis
- Formal Methods in Verification
- Housing, Finance, and Neoliberalism
- Financial Literacy, Pension, Retirement Analysis
- Corporate Finance and Governance
- COVID-19 epidemiological studies
- Housing Market and Economics
- Neural Networks Stability and Synchronization
- Banking stability, regulation, efficiency
- Smart Grid Security and Resilience
- Economic theories and models
University of Maryland, College Park
2015-2025
Polytechnic Institute of Cávado and Ave
2022
Systems Research Institute
2021
Polish Academy of Sciences
2021
Chinese Academy of Sciences
2021
Boğaziçi University
2021
University College London
2021
University of Alberta
2021
Hong Kong Metropolitan University
2021
University of Cyprus
2021
Consider that an autonomous linear time-invariant (LTI) plant is given and each member of a network LTI observers accesses portion the output plant. The dissemination information within dictated by pre-specified directed graph in which vertex represents observer. This paper proposes distributed estimation scheme natural generalization consensus observer computes its own state estimate using only vector accessible to it estimates other that, according graph, are available it. Unlike...
This paper addresses fundamental limitations of feedback using information theoretic conservation laws and flux arguments. The has two parts. In the first part, we derive a law dictating that causal cannot reduce differential entropy inserted in loop by external sources. An interpretation this result is total randomness induced disturbances, as measured entropy, be reduced feedback; it can only re-allocated time or frequency (if well defined). Under asymptotic stationarity assumptions,...
We study the stabilizability of uncertain stochastic systems in presence finite capacity feedback. Motivated by structure communication networks, we consider a variable rate digital link. Such link is used to transmit state measurements between plant and controller. derive necessary sufficient conditions for internal external feedback loop. In accordance with previous publications, unstable plants possible if only link's average transmission above positive critical value. addition, stability...
This tutorial paper provides a comprehensive characterization of information structures in team decision problems and their impact on the tractability optimization. Solution methods for are presented various settings where discussion is structured two foci: The first centered solution stochastic teams admitting state-space formulations. second focus norm-optimal control linear plants under constraints.
Consider a first order linear time-invariant discrete time system driven by process noise, pre-processor that accepts causal measurements of the state system, and estimator. The estimator are not co-located, and, at every time-step, transmits either real number or free symbol to We seek jointly minimize cost combines two terms; expected squared estimation error communication cost. In our formulation, transmission from incurs positive while symbols induce zero This paper proves analytically...
In this paper, we study fundamental limitations of disturbance attenuation feedback systems, under the assumption that controller has a finite horizon preview disturbance. contrast with prior work, extend Bode's integral equation for case where is made available to via general, capacity, communication system. Under asymptotic stationarity assumptions, our results show new limitation differs from only by constant, which quantifies information rate through absence stationarity, derive...
Consider a discrete-time, linear time-invariant process, two sensors and one controller. The process state is observed in the presence of noise by sensors, which are connected to controller via links that feature erasure. If link transmits successfully then finite-dimensional vector real numbers conveyed from sensor an erasure event occurs, any information over lost. This paper addresses problem designing maps specify processing at minimize quadratic cost function. When lost either...
Consider that an autonomous LTI plant is given and a network of local observers assesses the output vector plant. Each observer in measures portion vector. computes state estimate using its measurements estimates other shared according to preselected neighborhood structure. This paper proposes update rule natural generalization consensus, for which we determine necessary sufficient conditions existence parameters lead asymptotic omniscience at all observers.
Young adults leave their parents' home at a higher rate in Northern Europe and the United States than Southern Europe, with broad implications on labor mobility, intergenerational sharing of resources fertility. This paper assesses if differences household structure can be traced back to restricted access credit for young. To study causal impact getting loan probability leaving nest, we exploit two reforms Portuguese program that subsidized interest mortgages signed by low- medium-income...
Consider that a linear time-invariant (LTI) plant is given and we wish to design stabilizing controller for it. Admissible controllers are LTI must belong pre-selected subspace may impose structural restrictions, such as sparsity constraints. The assumed be quadratically invariant (QI) with respect the plant, which, from prior results, guarantees there convex parametrization of all admissible provided an initial stable provided. This paper addresses previously unsolved problem extending...
We analyze the stability of a nonlinear dynamical model describing noncooperative strategic interactions among agents finite collection populations. Each agent selects one strategy at time and revises it repeatedly according to protocol that typically prioritizes strategies whose payoffs are either higher than those current or exceed population average. The is predicated on well-established research in evolutionary games, has two components. first payoff dynamics (PDM), which ascribes each...
Abstract Major disturbances can temporarily remove factors that otherwise constrain population abundance and distribution. During such windows of relaxed top‐down and/or bottom‐up control, ungulate populations grow rapidly, eventually leading to resource depletion density‐dependent expansion into less‐preferred habitats. Although many studies have explored the demographic outcomes ecological impacts these processes, fewer examined individual‐level mechanisms by which they occur. We...
This paper is an empirical study of lending relationships among banks in the interbank market. We use a unique data set to construct dynamic measure relationships, namely intensity trading volume between lender and borrower, as percentage their with all market participants, recent past. find that allow participants obtain insurance against shortage funds during reserve maintenance period. also evidence tend be established whose liquidity shocks are less correlated, for whom gains from...
Consider a discrete-time networked control system, in which the controller has direct access to noisy measurements of output plant. However, information flows from actuator via channel that features Bernoulli erasure events. If an occurs, outputs symbol; otherwise, it transmits real finite-dimensional vector. We determine necessary and sufficient conditions for stabilizability unstable linear time-invariant Given minimal state-space representation plant, are expressed terms probability at...
This tutorial article describes a dynamical systems framework rooted in evolutionary game principles to characterize non-cooperative strategic interactions among large populations of bounded rationality agents. It also overviews recent results that use passivity notions the stability Nash-like equilibria. In our framework, each agent belongs population prescribes its members strategy set and revision protocol. A so-called social state registers proportions agents every adopting pre-selected...
In this paper we discuss the consensus problem for a network of dynamic agents with undirected information flow and random switching topologies.The is determined by Markov chain, each topology corresponding to state chain.We show that in order achieve almost surely from any initial sets graphs closed positive recurrent chain must be jointly connected.The analysis relies on tools matrix theory, Markovian jump linear systems theory processes theory.The distinctive feature work addressing...
We present coding strategies, which are variants of the Schalkwijk-Kailath scheme, for communicating reliably over additive white noise channels in presence corrupted feedback. Our framework comprises an forward channel and a feedback link. consider two types corruption mechanisms The first is quantization noise, i.e., encoder receives quantized values past outputs channel. uniform, memoryless time invariant. second mechanism arbitrarily distributed bounded noise. Here we allow...
Quadratic invariance is a condition which has been shown to allow for optimal decentralized control problems be cast as convex optimization problems. The relates the constraints that decentralization imposes on controller structure of plant. In this technical note, we consider problem finding closest subset and superset constraint are quadratically invariant when original not. We show can itself case where subject delay between subsystems, but fails only sparsity controller. For case,...
Young adults leave their parents' homes at a higher rate in Northern Europe or the United States than Southern Europe, with broad implications on labor market mobility and fertility. We assess if differences household formation are associated to access credit by estimating impact of cost mortgage probability that young adult leaves his her home. Exogenous changes identified using reform 1998 cancellation 2002 Credito Bonificado, Portuguese program provided four different reductions interest...
Consider a distributed sensing system that comprises two sensors, each observing random variable, and remote estimator. The goal of the estimator is to produce estimates variables based on information transmitted it by sensors. are independent transferred from sensors via collision channel, which can only convey single packet. Each sensor has authority decide what when transmit, simultaneous transmissions result in event be detected at In our formulation, there no communication between...
This paper addresses a fundamental limitation of performance for feedback systems, in the presence communication channel. The loop comprises discrete-time, linear and time-invariant plant, channel, an encoder decoder which may also embody controller. Measurements plant's output must be encoded transmission over Information, at other end is decoded used to generate control signal, additively disturbed by Gaussian stationary stochastic process. We derive inequality form L/spl I.bar/ /spl ges/...