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Reliable distributed systems

作者： Yennun Huang Bell Laboratories Murray Hill NJ USA

ISBN: (纸本)0818674814

A cluster is a group of computers which are loosely connected together to provide fast and reliable services. There have been many applications built on cluster systems.such as distributed/parallel database applications, telecommunication systems.and, recently, internet/intranet servers. Cluster systems.can deliver similar or better performance and reliability than traditional mainframes, supercomputers and fault-tolerant systems.with a much lower hardware cost.

关键词： Application software distributed computing Middleware Computerized monitoring Resource management File servers Telecommunication computing Fault tolerant systems Image restoration Maintenance

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A modular implementation model of the Primary-Shadow TMO replication scheme and a testing approach using a real-time environment simulator

A modular implementation model of the Primary-Shadow TMO rep...

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International symposium on software reliability Engineering (ISSRE)

作者： K.H. Kim C. Subbaraman University of California Irvine CA USA Microsoft Corporation Seattle WA USA

An extension of the conventional object structuring approach, called the TMO structuring scheme, has been formulated as a unified scheme for object oriented structuring of both real time and non real time applications while enabling the system designer to provide design time guarantees of timely service capabilities of the objects designed. In another area, the DRB/PSP scheme has been established as a concrete scheme for achieving scalable time bounded fault tolerance for both software and hardware faults in distributed and parallel computer systems. A recent integration of the TMO structuring scheme and the basic principle of the DRB/PSP scheme is the primary shadow TMO replication (PSTR) scheme. The TMO scheme and the PSTR scheme present good potentials for realizing a quantum jump in design productivity and system reliability in the real time distributed computing application field. We first present a modular implementation model of the PSTR scheme that can be incorporated into most commercial real time operating systems. This modular implementation model is amenable to a rigorous analysis of the recovery time bounds, a measure of great importance in complex systems. In addition, a new style of testing both control algorithms and time bounded fault tolerance protocols by use of real time simulation components is presented. The implementation model and the testing approach have been validated by a non trivial experiment.

关键词： Object oriented modeling Real time systems distributed computing Testing Application software Concrete Fault tolerant systems Hardware Concurrent computing Quantum computing

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Applications of Blockchain Technology for Secure Transaction of Electronic Health Records 2

Applications of Blockchain Technology for Secure Transaction...

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2nd International Conference on Automation, Computing and Renewable systems. ICACRS 2023

作者： Kunduru, Arjun Reddy Thatikonda, Ramya Vaddadi, Srinivas A. Lakshmi, B. Durairaj, Yabesh Abraham Khirasaria, Vivek Software Developer OrlandoFL United States Information Technology University of the Cumberlands United States Principal System Reliability Architect Department - Risk & Reliability University of the Cumberlands United States MBA Department Panimalar Engineering College India School of Management SA College of Arts and Science India Faculty of Engineering and Technology Sharda University Uzbekistan

ISBN: (纸本)9798350340235

The healthcare industry is not immune to the trend of adopting new IT systems. and this includes hospitals and doctors' offices. To store a patient's medical history (including diagnoses and treatments), medical history (including diagnostic pictures), and financial data (including demographics and insurance details), a computerised database known as an "Electronic Health Record" (EHR) is used. Because medical records are typically private and must be shielded from prying eyes, ensuring their secure transfer is a top priority for healthcare systems. Electronic health records (EHRs) are used in the proposed study to ensure the security of all sent medical data, including the Chest X-ray MedPix images. This article describes a blockchain-based solution that patients can use to keep all their data in one secure location. This system was built with the Ganache tool on the Ethereum network, making use of Solidity and *** as well as other languages, tools, and approaches. In this study, a systematic method is described wherein blockchain smart contracts are used to record patient information and execute tasks in a distributed environment. After a smart contract has been deployed, all transactional communication occurs within its encrypted confines, protecting both the parties and their personal information. As an added bonus, the validated and broadcasted changes intended by the transaction can be checked. To ensure that government agencies have quick access to protected records, there is a cryptocurrency wallet (MetaMask) that stores the information in an encrypted, decentralised manner. Both patients and physicians can use the wallet to log in. In addition, the system will manage and protect all of the doctor and patient's information. Things like the following are in scope for the proposed system: Users may now access the same information at the same time because to blockchain's distributed ledger capabilities, which boosts productivity, establishes trust, and lowe

关键词： Blockchain Electronic health record Healthcare systems

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Policy-driven fault management in distributed systems

Policy-driven fault management in distributed systems

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International symposium on software reliability Engineering (ISSRE)

作者： M.J. Katchabaw H.L. Lutfiyya A.D. Marshall M.A. Bauer Department of Computer Science University of Western Ontario London Canada

Management policies can be used to specify requirements about the desired behaviour of distributed systems. Violations of policies (faults) can then be detected, isolated, located and corrected using a policy-driven fault management system. Other work in this area to date has focused on network-level faults. We believe that in a distributed system it is more appropriate to focus on faults at the application level. Furthermore, this work has been largely domain-specific-a generic, structured approach to this problem is needed. Our work has focused on policy-driven fault management in distributed systems.at the application level. In this paper, we define a generic architecture for policy-driven fault management and present a prototype system based on this architecture. We also discuss experience to date using and experimenting with our prototype system.

关键词： Network servers Computer network management distributed computing Thermal management Computer science Prototypes Open systems Computer networks Communication networks Operating systems

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Engineering reliability into hybrid systems.via rich design models: recent results and current directions 06

Engineering reliability into hybrid systems via rich design ...

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International symposium on Parallel and distributed Processing (IPDPS)

作者： S. Banerjee L. Cheung L. Golubchik N. Medvidovic R. Roshandel G. Sukhatme Computer Science Department University of Southern California Los Angeles CA USA Department of Computer Science & Software Engineering Seattle University Seattle WA USA EE-Systems Department IMSC University of Southern California Los Angeles CA USA

ISBN: (纸本)9781424400546

software reliability techniques are aimed at reducing or eliminating failures in software systems. reliability in software systems.has traditionally been measured during or after system implementation. However, software engineering methodology lays stress on doing the "correct things" early on in the software development lifecycle in order to curb development and maintenance costs. In this paper, we argue that reliability of a software system should be assessed throughout the system's life span, starting with the software architecture level. Our research goal is to estimate the reliability of software systems.in early design stages, which we believe involves the ability to reason about numerous uncertainties that exist in this stage, including uncertainty due to lack of execution artifacts. Our proposed approach is to develop techniques that will couple software architectural models with a suite of stochastic reliability estimation models and allow us to reason about these uncertainties. In this paper, we present our recent results using our technique for reliability estimation of software components at the level of software architecture. Another important part of this paper is the discussion of our ongoing research efforts and open research problems in this area

关键词： reliability engineering Design engineering software systems Uncertainty software architecture software reliability software measurement software engineering Stress Programming

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Calculating worst-case execution times of transactions in databases for event-driven, hard real-time embedded systems

Proceedings of the International Database Engineering and Ap...

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proceedings of the International database Engineering and Applications symposium, IDEAS 2000年 149-157页

作者： Muennich, Alexander Faerber, Georg Technische Universitaet Muenchen Muenchen Germany

In embedded real-time systems.the use of databases increases, particularly to ensure the quality of data and to simplify the development of software. Especially for safety-critical applications one must guarantee in advance by suitable verification-algorithms that all deadlines hold in all possible cases of use. The worst-case execution time of transactions is an essential input of those algorithms. Therefore, we present here a method to calculate these times for non-distributed, main memory databases in event-driven, embedded hard real-time systems. We use the very powerful means of event-streams and event-dependency-matrices for a detailed description of the embedding environment and an application model to specify the necessary information about the application itself.

关键词： database systems

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Optical storage: technology and applications

Optical storage: technology and applications

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IEEE symposium on Mass Storage systems

作者： W. Lenth IBM Almaden Research Center San Jose CA USA

Summary form only given. Optical-storage technology makes use of laser light for recording digital data on rotating-disk media. It is characterized by the combination of high storage density, high data rate, fast access time, high reliability, and media removability. The author considers optical storage technology and its application.< >

关键词： Optical recording Application software Disk recording Costs CD-ROMs Storage automation Robotics and automation Optical devices Pulse width modulation Abstracts

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ImageNet: a global distributed database for color image storage, and retrieval in medical imaging systems

ImageNet: a global distributed database for color image stor...

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Annual IEEE symposium on Computer-Based Medical systems

作者： R. Martinez D. Smith H. Trevino University of Arizona Tucson Tucson AZ USA Atlas Telecommunications Portland OR USA Bellcore Morristown NJ USA

The authors describe the overall system design for ImageNet and present a system prototype developed on an Ethernet network in the Computer Engineering Research Laboratory at the University of Arizona. ImageNet is a global distributed color image database and communications system with multiple database nodes and user workstations (WSs). Each database node serves a geographical region with several WS users. The database nodes are interconnected with a fiber optic backbone network. The first prototype of the ImageNet over Ethernet has been successfully implemented. The WS software showed that the user WS software provided the required functionality. One could make data dictionary requests, formulate queries, make single and multiple online as well as offline image transfers, and display images. The WS interface is simple to use, and requires little training for new users. The ImageNet system has applications to global teleradiology and telepathology imaging systems.< >

关键词： Image storage distributed databases Image databases Color Prototypes Ethernet networks Computer networks Design engineering Workstations Optical fibers

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Cost analysis of adaptive fault management

Cost analysis of adaptive fault management

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Annual symposium on reliability and Maintainability (RAMS)

作者： R. Tirtea G. Deconinck R. Belmans K.U. Leuven Belgium

In this paper we extend the model to cover two aspects. On one hand the case of replicated services/applications used in distributed architectures with fault tolerance requirements. On the other hand the possibilities of processes/tasks to restart/migrate on different nodes in case of distributed systems. This extension reduces the cost of downtime and improves the availability.

关键词： Costs Power system management Condition monitoring Degradation Fault tolerant systems Runtime Fault detection Application software Fault tolerance System testing

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reliability optimization models for fault-tolerant distributed systems

Reliability optimization models for fault-tolerant distribut...

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Annual symposium on reliability and Maintainability (RAMS)

作者： N. Wattanapongsakorn S. Levitan King Mongkut''s University of Technology Thonburi Bangkok Thailand University of Pittsburgh Pittsburgh USA

ISBN: (纸本)0780366158

This paper presents four models to demonstrate the authors' techniques for optimizing software and hardware reliability for fault-tolerant distributed systems. The models help us find the optimal system structure while considering basic information on reliability and cost of the available software and hardware components. Each model is suitable for a distinct set of conditions or situations. All four models maximize reliability while meeting cost constraints. The simulated annealing optimization algorithm is selected to demonstrate system reliability optimization techniques for distributed systems.because of its flexibility in applying to various problem types with various constraints, as well as its efficiency in computation time. It provides satisfactory reliability results while meeting the constraints.

关键词： Fault tolerant systems Hardware Redundancy Simulated annealing Constraint optimization reliability Cooling Design optimization Cost function Computer architecture

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