Flow forth

FORTH Annotated Bibliography 5.31.11

Stack Caching in Forth

Stack caching speeds Forth up by keeping stack items in registers, reducing the number of memory accesses for stack items. This paper describes our work on extending Gforth’s stack caching implementation to support more than one register in the canonical state, and presents timing results for the resulting Forth system. For single-representation stack caches, keeping just one stack item in regi...

Back and forth bisimulations

This paper is concerned with bisimulation relations which do not only require related agents to simulate each others behavior in the direction of the arrows, but also to simulate each other when going back in history. First it is demonstrated that the back and forth variant of strong bisimulation leads to the same equivalence as the ordinary notion of strong bisimulation. Then it is shown that ...

Nisus steps forth.

Meanings that Roman authors gave to nisus (NYsus), a word chiefly used in poetry, ranged from the pedestrian (a step or tread) to the celestial (the course of the stars). Cicero, Horace, Vergil, and others used nisus to convey striving, endeavor, ascent, flight, and the pain of giving birth.1,2 In this issue of Neurology, a new feature, Nisus, steps forth, to link neurology and neurologists wit...

Go forth or multiply

A cell can move and reproduce, but it usually can't do both simultaneously. As Makagiansar et al. report on page 155, the pattern of phosphorylation on a membrane proteoglycan helps determine whether cells grow or go. The phosphory-lation differences direct the molecule to distinct parts of the cell membrane. Even cancer cells have to slow down before they can divide, as do normal progenitor ce...