Models of Multi-user Write-Efficient Memories and General Diametric Theorems
نویسندگان
چکیده
منابع مشابه
Models of Multi-User Write-Efficient Memories and General Diametric Theorems
Write{e cient memories (WEM) were introduced by Ahlswede/Zhang as a model for storing and updating information on a rewritable medium. We strengthen the capacity theorem by providing a full control of the rates of the spreads. Next we adress and settle the storage capacity region problem under the average costs constraint in the case of many users, who write on the memory in an arbitrary order,...
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Continuing our earlier work on write{eecient memories (WEM) we introduce now models, where several persons use the same storage device. At any time instant exactly one of a prescribed set of users has access to the memory, but there is no protocol, which determines the moving order. Among the constraints we analyse the most interesting one is a complete privacy protection. While a user stores n...
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Diametric theorems in seuence spaces
In a finite metric space (F, #) a (discrete) diametrical problem concerns a quest ion like "How large can a subset A of F with #(a, a I) <_ 5 for all a, a I E A be and what are the opt imal configurations?" For systems of subsets with the union function d V or binary sequences with the Hamming distance dH the diametrical problems have been solved by Ka tona [3] and Klei tman [4], respectively. ...
متن کاملReport on Models of Write-Efficient Memories with Localized Errors and Defects
Write–efficient memories (WEM) as a model for storing and updating information were introduced by R. Ahlswede and Z. Zhang [2]. We consider now three new models of WEM with localized errors and defects, resp. In the situation (E+,D−), where the encoder is informed but the decoder is not informed about the previous state of the memory we study 1. WEM codes correcting defects, 2. WEM codes detect...
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ژورنال
عنوان ژورنال: Information and Computation
سال: 1997
ISSN: 0890-5401
DOI: 10.1006/inco.1997.2629