Hodgepodge rule

Choosing to describe their rule in terms of a spread of a disease, Gerhardt and Schuster interpret a as follows. Cells whose value a = 0 are labeled as healthy cells cells with value a = N are labeled as ill cells cells with intermediate values 1 a N are called infected. The temporal evolution of the system, parameterized by constants p,/(, pj and u (see below), is then defined in terms of these three different infection states. 

Healthy Cells In analogy to the catalytic reaction in the chemical system, in 

Infected Cells Infected cells are assumed to gradually, and linearly, approach the ill state as a function of the average degree of infection in their neighborhood. Define Sij t) as the average degree of infection of sites neighboring site (bi) at time  

Ill Cells Once a site becomes ill, it immediately (i.e. on the next time step) reverts back to being healthy  

This can be interpreted as the reduction of a catalytic unit after the palladiumoxide phase has been reached. 

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Plate 4. A snapshot of the Hodgepodge CA. The Hodgepodge rule, introduced by Ger-hardt and Schuster [gerh89], is chareicterized by its self-org tnized spiral structures and is a crude model of a famous oscillating chemical reeiction-diffusion system called the Belousov-Zh botinskii reaction. See Chapter 8. 

Fig. 8.15 Screenshot from a run of Gerhardt and Schuster s Hodgepodge CA rule.

When the OSHAct was first passed, much criticism stemmed from the fact that the legislation was a hodgepodge of rules of thumb and guidelines never intended to be made into laws. Since the passage of the Act, many of the trivial regulations have been changed or eliminated in an attempt to make it a more reasonable standard for workplace performance. 

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