A passivity-based approach to stability of spatially distributed systems with a cyclic interconnection structure. Jovanovic, M., Arcak, M., & Sontag, E. IEEE Transactions on Circuits and Systems, Special Issue on Systems Biology, 55:75-86, 2008. Preprint: also arXiv math.OC/0701622, 22 January 2007.
abstract   bibtex   
A class of distributed systems with a cyclic interconnection structure is considered. These systems arise in several biochemical applications and they can undergo diffusion driven instability which leads to a formation of spatially heterogeneous patterns. In this paper, a class of cyclic systems in which addition of diffusion does not have a destabilizing effect is identified. For these systems global stability results hold if the "secant" criterion is satisfied. In the linear case, it is shown that the secant condition is necessary and sufficient for the existence of a decoupled quadratic Lyapunov function, which extends a recent diagonal stability result to partial differential equations. For reaction-diffusion equations with nondecreasing coupling nonlinearities global asymptotic stability of the origin is established. All of the derived results remain true for both linear and nonlinear positive diffusion terms. Similar results are shown for compartmental systems.
@ARTICLE{IEEEsysbio_JAS,
   AUTHOR       = {M.R. Jovanovic and M. Arcak and E.D. Sontag},
   JOURNAL      = {IEEE Transactions on Circuits and Systems, Special Issue on Systems Biology},
   TITLE        = {A passivity-based approach to stability of spatially 
      distributed systems with a cyclic interconnection structure},
   YEAR         = {2008},
   OPTMONTH     = {},
   NOTE         = {Preprint: also arXiv math.OC/0701622, 22 January 2007.},
   OPTNUMBER    = {},
   PAGES        = {75-86},
   VOLUME       = {55},
   KEYWORDS     = {MAPK cascades, systems biology, biochemical networks, 
      nonlinear stability, nonlinear dynamics, diffusion, secant condition, 
      cyclic feedback systems},
   PDF          = {../../FTPDIR/jovanovic_arcak_sontag_TAC_CAS2008.pdf},
   ABSTRACT     = {A class of distributed systems with a cyclic 
      interconnection structure is considered. These systems arise in 
      several biochemical applications and they can undergo diffusion 
      driven instability which leads to a formation of spatially 
      heterogeneous patterns. In this paper, a class of cyclic systems in 
      which addition of diffusion does not have a destabilizing effect is 
      identified. For these systems global stability results hold if the 
      "secant" criterion is satisfied. In the linear case, it is shown that 
      the secant condition is necessary and sufficient for the existence of 
      a decoupled quadratic Lyapunov function, which extends a recent 
      diagonal stability result to partial differential equations. For 
      reaction-diffusion equations with nondecreasing coupling 
      nonlinearities global asymptotic stability of the origin is 
      established. All of the derived results remain true for both linear 
      and nonlinear positive diffusion terms. Similar results are shown for 
      compartmental systems.}
}

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