Download Content-Addressable Memories by Teuvo Kohonen PDF

By Teuvo Kohonen

ISBN-10: 3642965520

ISBN-13: 9783642965524

ISBN-10: 3642965547

ISBN-13: 9783642965548

As a result of continuous development within the large-scale integration of semiconductor circuits, parallel computing ideas can already be met in inexpensive sys­ tems: a number of examples exist in photo processing, for which designated demanding­ ware is implementable with particularly modest assets even by way of nonprofessional designers. rules of content material addressing, if completely understood, can thereby be utilized successfully utilizing general parts. however, mass garage according to associative ideas nonetheless exists simply within the lengthy­ time period plans of machine technologists. this example is just a little careworn by way of the truth that definite expectancies are held for the improvement of recent garage media similar to optical stories and "spin glasses" (metal alloys with low-density magnetic impurities). Their applied sciences, notwithstanding, would possibly not ripen until eventually after "fifth new release" desktops were equipped. it sounds as if software program tools for content material addressing, specially these in accordance with hash coding rules, are nonetheless retaining their place firmly, and some strategies were constructed lately. As they want no distinctive undefined, one may anticipate that they're going to unfold to a large circle of clients. This monograph relies on an intensive literature survey, such a lot of which was once released within the First variation. i've got further Chap. ?, which incorporates a assessment of more moderen paintings. This up-to-date publication now has references to over 1200 unique courses. within the enhancing of the recent fabric, I acquired important aid from Anneli HeimbUrger, M. Sc. , and Mrs. Leila Koivisto.

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Then hash coding usually offers effective means for performing the task. If, on the other hand, the searching conditions are specified by giving the values or ranges of certain attributes, especially using magnitude relations and Boolean functions, then the traditional sorting and tree searching methods might be preferred. Hash coding has been selected for presentation in this book since it is what many high-level programming languages and linguistic data structures make extensive use of, and a view is generally held that hash coding constitutes one of the most direct implementations of associative and content-addressable processing functions in computer science.

Mere memory-dependent responses or classifications may not be regarded sufficient to represent the operation of associative memory. It seems that the available memory capacity could be utilized more efficiently if it were possible to represent only significant details accurately. and for those parts which are more common, to use average or stereotypic representations. It seems that the human memory to a great extent operates in this way; although a single occurrence can cause clear memory traces.

If a keyword may consist of several separate words, the blank may be included in the alphabet, too. It will further be emphasized below that it is advantageous to have the number of characters in the alphabet be a prime number; this number occurs as a radix in the numerical conversion. Assume now that for all different characters i in the alphabet, numerical values di E {O,1,2, ... ,w-l} are assigned in some order whereby a string of characters, written as k = dNdN_l ... dldO' may be considered as the representation of an integer in the base of w.

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Content-Addressable Memories by Teuvo Kohonen

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