Availability

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In telecommunications and reliability theory, the term availability has the following meanings: The degree to which a system, subsystem, or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, i.e. , a random, time. Simply put, availability is the proportion of time a system is in a functioning condition. (Wikipedia.org)






Conferences related to Availability

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2017 Annual Reliability and Maintainability Symposium (RAMS)

Tutorials and original papers on reliability, maintainability, safety, risk management, and logistics


2014 14th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)

The CCGrid symposium provides a major international forum for presenting and sharing recent research accomplishments and technological developments in the field of Cluster,Cloud and Grid computing. The symposium is attended by researchers and practitioners from both industry and academia. In 2013 the conference will be held in Chicago Illinois USA.

  • 2013 13th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)

    All aspects of cluster, cloud and grid computing (architecture, resource management, programming models, etc.).

  • 2012 12th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)

    The CCGrid symposium provides a major international forum for presenting and sharing recent research accomplishments and technological developments in the field of Cluster, Cloud and Grid computing. The symposium is attended by researchers and practitioners from both industry and academia. In 2012 the conference will be held in Ottawa, Canada.

  • 2011 11th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)

    CCGrid 2011 is the eleventh in a series of successful international symposia will take place in Newport Beach, CA, USA. Grid Computing started as a generalization of Cluster Computing, promising to deliver large scale levels of parallelism to high-performance applications by crossing administrative boundaries. Moreover, the use of computational and data resources in high-performance applications, undertaken over Grid infrastructure, have started to now become a reality. Today we face the huge challenge of m

  • 2010 10th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid)

    In 2010, CCGrid will return to Australia, to Melbourne, to celebrate its 10th anniversary. CCGrid 2010 will have a special focus on three important and immediate issues that are significantly influencing all aspects of Cluster, Cloud and Grid computing: Economics, Environment and Autonomics.

  • 2009 9th IEEE International Symposium on Cluster Computing and the Grid (CCGrid)

    Grid technology is establishing the way out of the academic incubator and into industry environments. The goal of CCGrid 2009 is to serve as an international forum for researchers and practitioners to present their innovative ideas and experiences in the multi-faceted areas of Cluster and Grid computing including emerging areas such as Cloud Computing.

  • 2008 8th IEEE International Symposium on Cluster Computing and the Grid (CCGrid)


2013 15th International Conference on Transparent Optical Networks (ICTON)

ICTON addresses applications of transparent and all optical technologies in telecommunication networks, systems, and components. ICTON topics are well balanced between basic optics and network engineering. Interactions between those two groups of professionals are a valuable merit of conference. ICTON combines high level invited talks with carefully selected regular submissions.

  • 2012 14th International Conference on Transparent Optical Networks (ICTON)

    ICTON addresses applications of transparent and all optical technologies in telecommunication networks, systems, and components. ICTON topics are well balanced between basic optics and network engineering. Interactions between those two groups of professionals are a valuable merit of conference. ICTON combines high level invited talks with carefully selected regular submissions.

  • 2011 13th International Conference on Transparent Optical Networks (ICTON)

    ICTON addresses applications of transparent and all optical technologies in telecommunication networks, systems, and components. ICTON topics are well balanced between basic optics and network engineering. Interactions between those two groups of professionals are a valuable merit of conference. ICTON combines high level invited talks with carefully selected regular submissions.

  • 2010 12th International Conference on Transparent Optical Networks (ICTON)

    ICTON addresses applications of transparent and all optical technologies in telecommunication networks, systems, and components. ICTON topics are well balanced between basic optics and network engineering. Interactions between those two groups of professionals are a valuable merit of conference. ICTON combines high level invited talks with carefully selected regular submissions.

  • 2009 11th International Conference on Transparent Optical Networks (ICTON 2009)

    ICTON scope is concentrated on the applications of transparent and all-optical technologies in telecommunication networks, systems, and components. ICTON topics are balanced between basic optics and network engineering. Interactions between those two groups of professionals are an important merit of conference. ICTON combines high level invited talks with regular submissions.

  • 2008 10th Anniversary International Conference on Transparent Optical Networks (ICTON 2008)

    ICTON is intended to promote advances in applications of transparent and all-optical technologies in broadband telecommunication networks, systems, and components. ICTON provides an interaction forum for network engineers from one side, and researchers in the field of physics, optics, device and material science from other side.


2013 6th International Conference on Robotics, Automation and Mechatronics (RAM)

The goal of the RAM 2013 is to bring together experts from the field of robotics, automation and mechatronics to discuss on the state-of-the-art and to present new research findings and perspectives of future developments.

  • 2011 IEEE 5th International Conference on Robotics, Automation and Mechatronics (RAM)

    The goal of the RAM 2011 is to bring together experts from the field of robotics, automation and mechatronics to discuss on the state-of-the-art and to present new research findings and perspectives of future developments with respect to the conference themes. The RAM 2011 is held in conjunction with the IEEE International Conference on Cybernetics and Intelligent Systems (CIS 2011)

  • 2008 IEEE Conference on Robotics, Automation and Mechatronics (RAM)

    The CIS-RAM 2008 is to bring together experts from the field of cybernetics, intelligent systems robotics, automation, and mechatronics to present and discuss new research findings and perspectives of future developments with respect to the conference themes.


2013 9th International Conference on the Design of Reliable Communication Networks (DRCN)

DRCN is a well established biennial forum for scientists on the reliability and availability of communication networks and services. The conference covers topics from equipment and technology for survivability to network management and public policy, through theory and techniques for survivable and robust networks and application design. The aim of the conference is to bring together people from industry, government and academia in those disciplines in a lively forum.


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Periodicals related to Availability

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Communications Magazine, IEEE

IEEE Communications Magazine was the number three most-cited journal in telecommunications and the number eighteen cited journal in electrical and electronics engineering in 2004, according to the annual Journal Citation Report (2004 edition) published by the Institute for Scientific Information. Read more at http://www.ieee.org/products/citations.html. This magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications ...


Communications, IEEE Transactions on

Telephone, telegraphy, facsimile, and point-to-point television, by electromagnetic propagation, including radio; wire; aerial, underground, coaxial, and submarine cables; waveguides, communication satellites, and lasers; in marine, aeronautical, space and fixed station services; repeaters, radio relaying, signal storage, and regeneration; telecommunication error detection and correction; multiplexing and carrier techniques; communication switching systems; data communications; and communication theory. In addition to the above, ...


Computer

Computer, the flagship publication of the IEEE Computer Society, publishes peer-reviewed technical content that covers all aspects of computer science, computer engineering, technology, and applications. Computer is a resource that practitioners, researchers, and managers can rely on to provide timely information about current research developments, trends, best practices, and changes in the profession.


Computers, IEEE Transactions on

Design and analysis of algorithms, computer systems, and digital networks; methods for specifying, measuring, and modeling the performance of computers and computer systems; design of computer components, such as arithmetic units, data storage devices, and interface devices; design of reliable and testable digital devices and systems; computer networks and distributed computer systems; new computer organizations and architectures; applications of VLSI ...


Consumer Electronics, IEEE Transactions on

The design and manufacture of consumer electronics products, components, and related activities, particularly those used for entertainment, leisure, and educational purposes


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Xplore Articles related to Availability

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Modeling Software Rejuvenation on a Redundant System Using Monte Carlo Simulation

Sonia Malefaki; Vasilis P. Koutras; Agapios N. Platis 2012 IEEE 23rd International Symposium on Software Reliability Engineering Workshops, 2012

In this paper, rejuvenation is modeled in a redundant computer system in order to counteract software aging. The evolution of such a system in time could be modeled by a Markov or a semi-Markov process. Nevertheless, due to generally distributed repair times of system components, the entire system is non -- Markovian. Thus, Monte Carlo simulation methods are used for ...


A time-dependent availability measure for a repairable system subject to catastrophic failures

G. K. Agrafiotis IEEE Transactions on Reliability, 1990

Attention is given to a repairable system which is subject to catastrophic failures while it is in operation or under repair. The topic of investigation is the time-dependent point availability measure of the system, which is obtained in terms of the repair and failure time distributions and in the form of convolution integrals that are readily evaluated by means of ...


Cost Optimality in Testing and Rejuvenation

Michael Grottke; Benjamin Schleich 2012 IEEE 23rd International Symposium on Software Reliability Engineering Workshops, 2012

In this paper, we extend models for the test phase and the operational phase with cost aspects, to explore cost optimality in testing and rejuvenating software systems that can age. For example, we find that under limited resources it may be advisable not to focus on the removal of aging-related bugs in the test phase, rather, the adverse affects of ...


Enhancing Remote Walkthrough for E-learning Environments on Mobile Devices over Heterogeneous Networks

Azzedine Boukerche; Richard Werner Nelem Pazzi 2006 IEEE Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems, 2006

With the growth of the Internet and availability of high bandwidth connections to domestic users, it became possible to deploy remote navigation within virtual environments over the Internet. For instance, virtual museum walkthrough, virtual mall, gaming, training, monitoring, and e-learning, just to name a few. We have also seen a new trend towards wireless networks and the use of mobile ...


Tomorrows high-quality SoCs require high-quality embedded memories today

U. Schlichtmann Proceedings International Symposium on Quality Electronic Design, 2002

Summary form only given. Embedded memories increasingly dominate SoC designs - whether chip area, performance, power consumption, manufacturing yield or design time are considered. ITRS data indicate that the embedded memory contents of ICs may increase from 20% in 1999 to 90% at the 50 nm node by the end of the decade. Therefore, even more than at present, the ...


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Educational Resources on Availability

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eLearning

Modeling Software Rejuvenation on a Redundant System Using Monte Carlo Simulation

Sonia Malefaki; Vasilis P. Koutras; Agapios N. Platis 2012 IEEE 23rd International Symposium on Software Reliability Engineering Workshops, 2012

In this paper, rejuvenation is modeled in a redundant computer system in order to counteract software aging. The evolution of such a system in time could be modeled by a Markov or a semi-Markov process. Nevertheless, due to generally distributed repair times of system components, the entire system is non -- Markovian. Thus, Monte Carlo simulation methods are used for ...


A time-dependent availability measure for a repairable system subject to catastrophic failures

G. K. Agrafiotis IEEE Transactions on Reliability, 1990

Attention is given to a repairable system which is subject to catastrophic failures while it is in operation or under repair. The topic of investigation is the time-dependent point availability measure of the system, which is obtained in terms of the repair and failure time distributions and in the form of convolution integrals that are readily evaluated by means of ...


Cost Optimality in Testing and Rejuvenation

Michael Grottke; Benjamin Schleich 2012 IEEE 23rd International Symposium on Software Reliability Engineering Workshops, 2012

In this paper, we extend models for the test phase and the operational phase with cost aspects, to explore cost optimality in testing and rejuvenating software systems that can age. For example, we find that under limited resources it may be advisable not to focus on the removal of aging-related bugs in the test phase, rather, the adverse affects of ...


Enhancing Remote Walkthrough for E-learning Environments on Mobile Devices over Heterogeneous Networks

Azzedine Boukerche; Richard Werner Nelem Pazzi 2006 IEEE Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems, 2006

With the growth of the Internet and availability of high bandwidth connections to domestic users, it became possible to deploy remote navigation within virtual environments over the Internet. For instance, virtual museum walkthrough, virtual mall, gaming, training, monitoring, and e-learning, just to name a few. We have also seen a new trend towards wireless networks and the use of mobile ...


Tomorrows high-quality SoCs require high-quality embedded memories today

U. Schlichtmann Proceedings International Symposium on Quality Electronic Design, 2002

Summary form only given. Embedded memories increasingly dominate SoC designs - whether chip area, performance, power consumption, manufacturing yield or design time are considered. ITRS data indicate that the embedded memory contents of ICs may increase from 20% in 1999 to 90% at the 50 nm node by the end of the decade. Therefore, even more than at present, the ...


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IEEE-USA E-Books

  • Tie Line Utilization During Power System Restoration

    This paper identifies some of the critical roles of tie lines during power system restoration. Based on these roles, a systematic approach is developed to evaluate the impact of the availability of tie line assistance on restoration. Using this approach, a tie line expert system module has also been developed to supplement the previously developed EPRI restoration expert system (RES). The enhanced RES can now include available tie line power in recommending a restoration strategy to maximize the system generation capability by modifying the generator startup sequence. Simulation results confirm that outside assistance will improve the overall generation capability and provide an extra dimension to the flexibility of a company's restoration strategy.

  • Distributed Access Control in Cloud Computing Systems

    With the tremendous increase in the number of distributed applications, the issue of distributed access control has become an important research topic for both academia and industry. In distributed computing environments like cloud computing or service computing, authentication and authorization are the two important functions to be performed, to make sure that unauthorized users do not access distributed system components. An effective access control mechanism is an essential security component as far as protecting the confidentiality, integrity, and availability (CIA) of information hosted in the cloud is concerned. An effective access control mechanism implemented in the cloud domain should be scalable, reliable, and robust and it should provide required features and procedures for identity provisioning, deprovisioning, authentication, authorization, accounting, and auditing. In this chapter, we discuss the issue of distributed access control, major features and functionalities, access control policies and models, distributed access control architecture for multicloud environments, trust, and identity management in cloud computing environments. Related work shows some of the major research activities in the area of distributed access control considering the advantages and disadvantages of the approaches that have been adopted. We conclude this chapter by discussing a few research issues in the area of distributed access control in the cloud environment.

  • Frontmatter

    The prelims comprise: Title Trademarks and Disclaimers Review Policy About the Author Acknowledgement Table of Contents

  • Reliability Measurements

    This chapter focuses on the importance of reliability assessment. The reliability measurements represent the starting point for more complex evaluations concerning availability, maintainability, and safety (RAMS). The chapter presents some important definitions and the basic concepts for the evaluation of the reliability and describes the failure rate with the fundamental statistical parameters that are traditionally used in this context: mean time to failure (MTTF), mean time between failures (MTBF) and mean time to restore (MTTR). After these, some models of system reliability with details and examples for series, parallel and koon structures are presented. The chapter outlines some important techniques used to evaluate the availability of complex systems and equipment. In particular, a general description of failure modes and effects analysis (FMEA), failure modes, effects and criticality analysis (FMECA) and fault tree analysis (FTA) is proposed for the design review.

  • Maximizing Service Availability via Georedundancy

    This chapter contains sections titled: Theoretically Optimal External Redundancy Practically Optimal Recovery Strategies Other Considerations

  • Introduction

    None

  • Georedundancy Requirements

    This chapter contains sections titled: Internal Redundancy Requirements External Redundancy Requirements Manually Controlled Redundancy Requirements Automatic External Recovery Requirements Operational Requirements

  • Reliability Basics

    This chapter contains sections titled: Comparing Hardware and Software Hardware Reliability Computer System Maintenance and Availability

  • Modeling Service Availability with External System Redundancy

    This chapter contains sections titled: The Simplistic Answer Framing Service Availability of Standalone Systems Generic Markov Availability Model of Georedundant Recovery Solving the Generic Georedundancy Model Practical Modeling of Georedundancy Estimating Availability Benefit for Planned Activities Estimating Availability Benefit for Disasters

  • Recommendations for Architecting a Reliable System

    This chapter contains sections titled: Architecting for Virtualization and Cloud Disaster Recovery IT Service Management Considerations Many Distributed Clouds versus Fewer Huge Clouds Minimizing Hardware-Attributed Downtime Architectural Optimizations



Standards related to Availability

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IEEE Recommended Practice for Communications-Based Train Control (CBTC) System Design and Functional Allocations

This recommended practice establishes a preferred system design and functional allocation for CBTC systems.


IEEE Standard Definitions for Use in Reporting Electric Generating Unit Reliability, Availability, and Productivity

This document standardizes terminology and indexes for reporting electric generating unit reliability, availability, and productivity performance measures while recognizing the power industry’s needs, including marketplace competition. This standard also includes equations for equivalent demand forced outage rate (EFORd), newly identified outage states, discussion of commercial availability, energy weighted equations for group performance indexes, definitions of outside management control (OMC), pooling ...


IEEE Standard Dictionary of Measures of the Software Aspects of Dependability

This standard specifies and classifies measures of the software aspects of dependability. It is an expansion of the scope of the existing standard; the revision includes the following aspects of dependability: reliability, availability, and maintainability of software. The applicability of this standard is any software system; in particular, it applies to mission critical systems, where high reliability, availability, and maintainability ...


IEEE Standard for Communications-Based Train Control (CBTC) Performance and Functional Requirements

Original Scope: This standard establishes a set of performance and functional requirements necessary for enhancing performance, availability, operations, and train protection using a CBTC System.---Revision: There is no change to the words of the scope. The revisions allow for driverless train operation, including automatic people movers.


IEEE Standard for User Interface Requirements in Communications-Based Train Control (CBTC) Systems

This standard establishes user interface requirements in communications-based train control (CBTC) systems.