By Manuel Lameiras Campagnolo (auth.)

This e-book constitutes the refereed court cases of the 3rd overseas convention on Unconventional types of Computation, UMC 2002, held in Kobe, Japan in October 2002.
The 18 revised complete papers provided including 8 invited complete papers have been rigorously reviewed and chosen from 36 submissions. All significant parts of unconventinal computing types are lined, specifically quantum computing, DNA computing, membrane computing, mobile computing, and probabilities to damage Turing's barrier. The authors handle theoretical elements, sensible implementations, in addition to philosophical reflections.

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Extra resources for Unconventional Models of Computation: Third International Conference, UMC 2002 Kobe, Japan, October 15–19, 2002 Proceedings

Sample text

Capturing this kind of timing freedom is an important function of the computational model. Communication among operators will often be dynamic and data dependent. When not all communications are equally likely, we have the opportunity to preferentially cluster the blocks involved in common communications more closely than less commonly communicating blocks. In the sequential processor world, people have long exploited instruction placement to increase spatial locality and hence virtual memory [9] and cache performance [25].

In order to get a feel for the difficulties, let us consider an accelerating machine H that supplies the values of the halting function. The famous halting function H takes pairs of integers as arguments and returns the value 0 or 1. H may be defined as follows, for any pair of integers x and y : H(x, y) = 1 if and only if x represents the program of a Turing machine that eventually halts if set in motion with the number y inscribed on its otherwise blank tape; H(x, y) = 0 otherwise. ) A machine able to ‘solve the halting problem’ can inform us, concerning any given Turing machine, whether or not H(x, y) = 1.

2. Compute Model Facilitates Heterogeneous Compute Pages and Component Scaling over which critical signals must travel. Commonly communicating blocks should be arranged to optimize spatial locality. The presence of communication links in the design representation is vital to enabling these kinds of optimizations. Area. Our first concern is to place computations to reduce requisite wiring and switching. This is the traditional domain of placement and can reduce wiring requirements from the O(N 2 ) area identified above to O(N 2p ) [5], where p is the exponent in Rent’s Rule [16] and typically has a value around 2/3.

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