NDLI: On the difference between Turing machine time and random-access machine time

Content Provider	IEEE Xplore Digital Library
Author	Regan, K.W.
Copyright Year	1993
Description	Author affiliation: State Univ. of New York, Buffalo, NY, USA (Regan, K.W.)
Abstract	Introduces a model of computation called the block move (BM) model. The BM extends the block transfer (BT) model of Aggarwal, Chandra, and Snir (1987), who studied time complexity under various memory access cost functions ranging from /spl musub 1/(a):=a to /spl musub log/(a):=[log/sub 2/ a]. We show that up to factors of log t in the total running time t, BMs under /spl musub 1/ are equivalent to multitape Turing machines, and BMs under /spl musub log/ are equivalent to log-cost RAMs. We also prove that for any well-behaved /spl mu/, the BM classes D/spl mu/TIME[t(n)] form a tight deterministic time hierarchy. Whether there is any hierarchy at all when /spl mu/ rather than t varies is tied to long-standing open problems of determinism vs. nondeterminism.<>
Starting Page	36
Ending Page	40
File Size	499565
Page Count	5
File Format	PDF
ISBN	0818642122
DOI	10.1109/ICCI.1993.315406
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-05-27
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Turing machines Read-write memory Computational modeling Registers Cost function Computational complexity Automata Computer science Polynomials Magnetic heads
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Libarray of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

On the difference between Turing machine time and random-access machine time