DEPENDABILITY, №4(47)-2013
Structural reliability. The theory and practice
- Gapanovich V.A.
DEVELOPMENT AND IMPLEMENTATION OF THE URRAN TECHNOLOGY ON RAILWAY TRANSPORT
Tasks faced by the Russian economy highlight the need to find ways of enhancing operation efficiency
developing railway transport. At the same time, we should not forget that railway transport, like any
other complex system, faces uncertainty or risks while carrying out its activities. Uncontrollable
risks can lead to unplanned maintenance costs, harm to people, property and other negative consequences
that adversely affect the operating performance of JSC RZD.
Keywords: reliability management, railway transport, life cycle cost, resource management,
risk management, management of functional safety.
- Pereguda A.I., Pereguda A.A., Timashev D.A.
THE MATHEMATICAL MODEL OF COMPUTER NETWORKS’ RELIABILITY
The paper has investigated mathematical models of the reliability of LAN with an arbitrary topology and recoverable components, with the analysis allowing to obtain the ratios of probabilities of data loss in a network, a failure probability and expectation of time to failure of a network’s components, without any assumptions about the laws of distribution of random variables. It has also offered the model for accounting multiple failures of network components.
Keywords: distribution function, expectation, process of recovery, loss of data, multiple failures, server, client, port, period of regeneration.- Maleev E.A., Chepurko V.A.
ROOT ESTIMATION OF DENSITY FUNCTION USING INCOMPLETE DATA
The paper offers two modifications of the nonparametric root estimation of a density function in
case of incomplete data in the form of grouped frequencies of failures. The first (integrated) method
is connected with respective alteration of a likelihood function. The second (resampling) method of the
restoration of failures is based on the iterative restoration of failure time points. The accuracy of the
offered estimation methods has been investigated.
Keywords: psi-function, square-root method, likelihood function, pseudo-failures.
- Grigoriev S.N.
ANALYSIS OF RELIABILITY AND ADAPTABILITY OF MICROWAVE ATTENUATOR
The paper considers the analysis of reliability and adaptability of a microwave attenuator as
exemplified by commercially available attenuators used in modern powerful wattmeters of absorbed type.
Keywords: microwave attenuator, wattmeter, reliability, failure-free operation, durability,
maintainability, adaptability, labor intensity, material consumption, energy consumption, technological cost.
Functional reliability. The theory and practice
- Kryanev A.V., Semenov S.S.
ON THE ISSUE OF QUALITY AND RELIABILITY OF EXPERT JUDGMENTS IN DETERMINING THE ENGINEERING LEVEL OF COMPLEX SYSTEMS
This paper has shown the topicality of using a method of expert judgments for developing complex technical systems (CTS).
And in reference with this, the paper has considered the issues of judgments of a required number of experts in conducting
peer reviews, their expert knowledge, data on the minimum size of an expert group and methodical approach to determine the
level of possible errors of experts to provide judgment of an expert group, including expert assessments on the basis of
past knowledge, as well as the possibility of an aggregate consideration of opinions of individual experts involved in
the assessment of a case study.
Keywords: complex technical systems, method of expert judgments, accuracy of an expert judgment, expert knowledge,
number of experts as part of a group, weight factor, dispersion of expert judgment errors.
- Maron A.I.
THE METHOD OF ALGORITHMS’ CONSTRUCTION FOR FAULT FINDING IN RAILWAY AUTOMATION SYSTEMS
The paper offers the method of optimal algorithms construction for fault finding in systems where losses from failures
grow exponentially with recovery time increasing. Such a situation is typical for railway automation systems.
Keywords: fault finding algorithms, railway automation systems, loss due to failures.
Functional safety. The theory and practice
- Lukinova O.V.
BUSINESS PROCESS DESIGN METHOD INSURING INFORMATION SYSTEM SECURITY BASED ON INTERCATEGORICAL REPRESENTATION OF PROTECTION PLANES IN OSE\RM MODELS
The paper describes the procedure for building business processes insuring the security of information system resources,
which is the environment of an enterprise’s automated business processes operation and represented in the form of a reference
model of an open environment.
Keywords: integrated system of protection, information system, the OSE\RM model, business process, protection mechanism.
- Kibzun A.I., Ignatov A.N.
ORGANIZATION OF MONITORING AND OPTIMAL MAINTENANCE TO PREVENT TRANSPORT ACCIDENTS WITH THE SPECIFIED LEVEL OF RELIABILITY
The probability of a transport accident significantly depends on various factors and groups of factors. The paper investigates the economic
expedience of monitoring a random factor and transport accident prevention. Several criteria for utility evaluation of monitoring and prevention
for various strategies to minimize an accident risk are offered. The paper also presents an example of using these results for forming a train.
Keywords: monitoring, probability of a transport accident, optimal preventive measures, reliability, cost-effectiveness.
Information
- Book by Shubinsky I.B. «Structural Reliability of Information Systems»
- Book by Shubinsky I.B. «Functional Reliability of Information Systems»
- Training courses in reliability - Gnedenko Forum