NDLI: Using the timely computing base for dependable QoS adaptation

Content Provider	IEEE Xplore Digital Library
Author	Casimiro, A. Verissimo, P.
Copyright Year	2001
Description	Author affiliation: Faculdade de Ciencias, Lisbon Univ., Portugal (Casimiro, A.)
Abstract	In open and heterogeneous environments, where an unpredictable number of applications compete for a limited amount of resources, executions can be affected by also unpredictable delays, which may not even be bounded. Since many of these applications have timeliness requirements, they can only be implemented if they are able to adapt to the existing conditions. We present a novel approach, called dependable QoS adaptation, which can only be achieved if the environment is accurately and reliably observed. Dependable QoS adaptation is based on the timely computing base (TCB) model. The TCB model is a partial quality of service synchrony model that adequately characterizes environments of uncertain synchrony and allows, at the same time, the specification and verification of timeliness requirements. We introduce the coverage stability property and show that adaptive applications can use the TCB to dependably adapt and enjoy this property. We describe the characteristics and the interface of a QoS coverage service and discuss its implementation details.
Sponsorship	IEEE Comput. Soc. Tech. Committee on Distributed Process
Starting Page	208
Ending Page	217
File Size	184327
Page Count	10
File Format	PDF
ISBN	0769513662
ISSN	10609857
DOI	10.1109/RELDIS.2001.970771
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Timing Delay Stability Web and internet services Multimedia systems Process control Navigation Large-scale systems Informatics Real time systems
Content Type	Text
Resource Type	Article
Subject	Theoretical Computer Science Computer Networks and Communications Software Hardware and Architecture

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 Library 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

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