stochastic resonance and coherence resonance reson… · sistem ispod bifurkacije (hopf, saddle...
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Stochastic Resonance and Coherence Resonance
Seminar 09.2010
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CONSTRUCTIVE ROLE OF NOISE
STOCHASTIC RESONANCE COHERENCE RESONANCE
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Stochastic Resonance (SR)
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Stohastična Rezonanca
nelinearni sistem
periodični signal
šum
Pitanje:Šta je to optimalni šum u pogledu prenosa signala?
Odgovor:To je konačan OPTIMALAN nivo šuma za koji je odgovor sistemamaksimalan: STOHASTIČNA REZONANCA (SR)
output
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SR Mehanizam
SLAB periodičnisignal
Gausovski beli šum
Čestica pod periodičnim uticajem u bistabilnom potencijalu
Šum nula: čestica osciluje unutar jame
Konačni šum: čestica može da preskače između dve jame
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Koherentna rezonanca (KR)Coherence Resonance (CR)
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Koherentna rezonanca
nelinearni sistemŠUM output
“Stohastična Rezonanca bez Spoljašnje Periodične Sile”Gang et al PRL (1993)
SR: odgovor bistabilnog sistema na SPOLJAŠNJU periodičnu silu, šum prisutanKR (CR): koherentno kretanje stimulisano UNUTRAŠNJOM dinamikom sistema
ŠUMOM IZAZVANE OSCILACIJE
SISTEM ISPOD BIFURKACIJE (Hopf, saddle node bif. on a limit cycle)
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PROTOTIP MODELA ZA KR (CR)
Fitz Hugh-Nagumo + šum
)t(Daxdt
dy
y3
xx
dt
dx 3
ξ
ε
++=
−−=
∣a∣>1 : stabilna fiksna tačka (stable fixed point)∣a∣<1 : granični krug (limit cycle)
“Coherence Resonance in a Noise-Driven Excitable System”Pikovsky and Kurths PRL (1997)
Deo vremenske serije
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Kvantifikacija KR (CR) : mera koherentnosti
Rp -Normalizovane fluktuacijeinterspajk intervala (1/SNR-signal-to-noise ratio)
tp-pulsno trajanje ili interspajk interval
p
p
pt
)t(VarR =
Šumom-indukovan granični krug (limit cycle):
D1=0.25
D2=0.07
D3=0.02
tp=ta+te za mali šum ta>>te
aktivacionovreme
ekskurzionovreme
2
p2pp tt)t(Var −=;
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