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Two-state trajectory
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Two-state trajectory : ウィキペディア英語版
Two-state trajectory

A two-state trajectory (also termed two-state time trajectory or a trajectory with two states) is a dynamical signal that fluctuates among two distinct values: ON & OFF, open & closed, +/-, etc. Mathematically, the signal X(t) has, for every t, either the value X(t)=c_\mathrm or X(t)=c_\mathrm.
In most applications, the signal is stochastic; nevertheless, it can have deterministic ON-OFF components. A completely deterministic two-state trajectory is a square wave. There are many ways we can create a two state signal, e.g. flipping a coin repeatedly.
A stochastic two state trajectory is among the simplest stochastic processes. Extensions include: 3 state trajectories, higher discrete state trajectories, continuous trajectories in any dimension, etc.
== Two state trajectories in biophysics, and related fields==
Two state trajectories are very common. Here, we focus on relevant trajectories in scientific experiments: these are seen in measurements in chemistry, physics, and the biophysics of individual molecules (e.g. measurements of protein dynamics and DNA and RNA dynamics, activity of ion channels, enzyme activity, quantum dots). From these experiments, one aims at finding the correct model explaining the measured process. We explain about various relevant systmes in what follows.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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