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Paper Abstract and Keywords
Presentation 2011-10-21 15:50
Memory Compression
Wing-Kin Sung (NUS), Kunihiko Sadakane (NII), Jesper Jansson (Ochanomizu U.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a new dynamic data-structure
for \emph{compressed random access memory}.
A memory (or string) $T[1..n]$, where each character $T[i]$ consists of $\log\sigma$ bits,
can be stored in
$n H_k(T) + \Order\left(n \log \sigma \left(\epsilon + \frac{k\log \sigma +\log \log n}{\log n}\right)\right)$
bits, where $H_k(T)$ is the $k$-th order empirical entropy of $T$
and $\epsilon > 0$ is any fixed constant,
such that
(1)~accessing $T[i..i+\log_{\sigma} n - 1]$ (one machine word)
$\Order(1)$ time
and (2)~replacing $T[i..i+\log_{\sigma} n - 1]$ by another string of length $\log_{\sigma} n$
takes $\Order(1/\epsilon)$ time.

We can also support insertion and deletion of $\log_{\sigma} n$ characters
in $\Order(\log n/\log\log n)$ time at the cost of increasing the access
time to $\Order(\log n/\log\log n)$ time, which matches a known lower bound.
Keyword (in Japanese) (See Japanese page) 
(in English) compression / random access memory / dynamic data structure / / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 256, COMP2011-34, pp. 39-46, Oct. 2011.
Paper # COMP2011-34 
Date of Issue 2011-10-14 (COMP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee COMP  
Conference Date 2011-10-21 - 2011-10-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To COMP 
Conference Code 2011-10-COMP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Memory Compression 
Sub Title (in English)  
Keyword(1) compression  
Keyword(2) random access memory  
Keyword(3) dynamic data structure  
1st Author's Name Wing-Kin Sung  
1st Author's Affiliation National University of Singapore (NUS)
2nd Author's Name Kunihiko Sadakane  
2nd Author's Affiliation National Institute of Informatics (NII)
3rd Author's Name Jesper Jansson  
3rd Author's Affiliation Ochanomizu University (Ochanomizu U.)
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Date Time 2011-10-21 15:50:00 
Presentation Time 35 
Registration for COMP 
Paper # IEICE-COMP2011-34 
Volume (vol) IEICE-111 
Number (no) no.256 
Page pp.39-46 
#Pages IEICE-8 
Date of Issue IEICE-COMP-2011-10-14 

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