Masatomo IWASA

Research Interests

• Self-organization
  
• Collective behavior of interacting chemotactic elements.
  
• Swarm oscillator model.
  
• M. Iwasa,
  Role of the internal degree of freedom of particles in cluster formation,
  Physical Review E 102 062202 (2020).
• M. Iwasa and D. Tanaka,
  Mechanism underlying the diverse collective behavior in the swarm oscillator model,
  Physics Letters A 381 3054-3061 (2017).
• M. Iwasa, K. Iida and D. Tanaka,
  Various collective behavior in swarm oscillator model,
  Physics Letters A 376 2117-2121 (2012).
• M. Iwasa, K. Iida and D. Tanaka,
  Juggling motion in a system of motile coupled oscillators,
  Physical Review E 83 036210 (2011).
• M. Iwasa and D. Tanaka,
  Dimensionality of clusters in a swarm oscillator model,
  Physical Review E 81 066214 (2010).
• M. Iwasa, K. Iida, and D. Tanaka,
  Hierarchical cluster structures in a one-dimensional swarm oscillator model,
  Physical Review E 81 046220 (2010).

• Biophysics
• Cell migration.
  
• R. Ishiwata and M. Iwasa,
  Cellular inertia,
  Scientific Reports 11 23799 (2021).
  
• M. Iwasa
  A mechanical toy model linking cell-substrate adhesion to multiple cellular migratory responses,
  Journal of Biological Physics 45 401 (2019).
• S. Huda, B. Weigelin, K. Wolf, K. V. Tretiakov, K. Polev, G. Wilk, M. Iwasa, F. S. Emami, J. W. Narojczyk, M. Banaszak, S. Soh, D. Pilans, A. Vahid, M. Makurath, P. Friedl, G. G. Borisy, K. Kandere-Grzybowska and B. A. Grzybowski,
  Levy-like movement patterns of metastatic cancer cells revealed in microfabricated systems and implicated in vivo,
  Nature Communications 9 4539 (2018).
• R. Ishiwata and M. Iwasa,
  Extracellular and intracellular factors regulating the migration direction of a chemotactic cell in traveling-wave chemotaxis,
  Physical Biology 12 026004 (2015).
• Cell population dynamics.
  
• G. Wilk, M. Iwasa, P. E. Fuller, K. Kandere-Grzybowska, and B. A. Grzybowski,
  Universal Area Distributions in the Monolayers of Confluent Mammalian Cells,
  Physical Review Letters 112 138104 (2014).
• Sumo (相撲); biomechanics in sports science.
  
• M. Iwasa,
  Minimal force to move the heavier opponent: Investigation of sumo game,
  Scientific Journal of Sport and Performance 2 151-164 (2023).

• Asymptotic analysis
  
• Singular perturbation methods.
• Lie symmetry analysis of differential and difference equations.
  
• Renormalization group method.
  
• M. Iwasa,
  Derivation of Asymptotic Dynamical Systems with Partial Lie Symmetry Groups,
  Journal of Applied Mathematics 2015 505281 (2015).
• M. Iwasa,
  Reduction of Dynamics with Lie Group Analysis,
  Advances in Mathematical Physics 2012 505281 (2012).
• H. Chiba and M. Iwasa,
  Lie equations for asymptotic solutions of perturbation problems of ordinary differential equations,
  Journal of Mathematical Physics 50 042703 (2009).
• M. Iwasa,
  Solution of reduced equations derived with singular perturbation methods,
  Physical Review E 78 066213 (2008).
• M. Iwasa and K. Nozaki,
  Renormalization group in difference systems,
  Journal of Physics A: Mathematical and Theoretical 41 085204 (2008).
• M. Iwasa and K. Nozaki,
  A Method to Construct Asymptotic Solutions Invariant under the Renormalization Group,
  Progress of Theoretical Physics 116 605-613 (2006).

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