Download Content-Addressable Memories by Teuvo Kohonen PDF

By Teuvo Kohonen

Due to continuous development within the large-scale integration of semiconductor circuits, parallel computing ideas can already be met in reasonably cheap sys­ tems: a number of examples exist in photograph processing, for which specified not easy­ ware is implementable with particularly modest assets even via nonprofessional designers. rules of content material addressing, if completely understood, can thereby be utilized successfully utilizing usual parts. however, mass garage according to associative rules nonetheless exists simply within the lengthy­ time period plans of machine technologists. this example is a bit careworn through the truth that yes expectancies are held for the improvement of recent garage media comparable to optical stories and "spin glasses" (metal alloys with low-density magnetic impurities). Their applied sciences, despite the fact that, would possibly not ripen till after "fifth new release" desktops were equipped. it sounds as if software program tools for content material addressing, specifically these in response to hash coding rules, are nonetheless keeping their place firmly, and some concepts were constructed lately. As they wish no detailed undefined, one may possibly anticipate that they are going to unfold to a large circle of clients. This monograph is predicated on an intensive literature survey, so much of which used to be released within the First version. i've got additional Chap. ?, which includes a evaluate of newer paintings. This up to date e-book now has references to over 1200 unique guides. within the modifying of the hot fabric, I got useful aid from Anneli HeimbUrger, M. Sc. , and Mrs. Leila Koivisto.

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The two external inputs A and B are assumed to have specialized roles in the information process, although the CAM makes no difference between them. A sequence of inputs {A(t)} is assumed to comprise the aentraZ temporaZ pattern, whereas B assumes the role of baakground and is stationary. For different A-sequences, the prevailing background B shall be different; this makes it possible to distinguish between different sequences in spite of the same A(t) patterns occurring in them. One further speCification shall be made: for the encoding of a temporal process in the CAM, it will be necessary to generate an output C(t) and a feedback pattern D(t) during the writing of each triple.

1 Hash Coding and Formatted Data Structures Hash coding is the fastest programmed searching method known, especially relating to large files. When one uses it, the keywords need not be ordered or sorted in any way. A minor drawback of hashing is a slightly higher demand of memory space when compared to the other methods; in view of the fact that the prices of memory components have been radically decreasing over many years, and this tendency continues, it seems reasonable to waste a little memory when plenty of benefits are thereby gained.

These parameters are recursively updated by all received signals whereby they can be regarded as a kind of memory for all received information. A characteristic of all constructs discussed in this book is that the memory shall be able to recall the stored representations as faithfully as possible, with a selectivity depending on the measure of similarity thereby applied. However, mere memory-dependent responses or classifications may not be regarded sufficient to represent the operation of associative memory.

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