• Ushakov I.A., Shubinskij I.B.
  ESSENTIAL PROBLEMS OF ENGINEERING RELIABILITY (WHO ARE WE? WHENCE ARE WE? WHERE DO WE GO?)

Structural reliability. The theory and practice

• Strel’nikov V.P.
  PREDICTION OF RESIDUAL SERVICE LIFE OF TECHNICAL SYSTEMS

Presented method of calculating (predicting) the life and residual life of technical systems on the basis of data on the number and reliability of constituent elements and the use of a two-parameter diffusion of a nonmonotonic distribution.
Keywords: recoverable system, failure, mean time between failures, limiting state, lifetime, residual service life.

• Ushakov I.A.
  HIERARCHICAL WAREHOUSING SYSTEM OF SPARE ELEMENTS FOR GLOBAL TELECOMMUNICATION SYSTEM

• Volodarsky V.A.
  INVESTIGATION OF THE PREVENTIVE REPLACEMENT OPTIMIZATION MODELS ECONOMIC STEADINESS

Investigation results of the economic steadiness and mathematical model equivalence preventive replacement optimization on the assumption of indetermination initial information are shown.
Keywords: mathematical model, optimization, replacement, steadiness, indetermination, equivalence.

• Kashtanov V.A., Kondrashova E.V.
  THE ANALYSIS OF THE ARRIVAL PROCESS, CONTROLLED WITH THE MARKOV CHAIN

The present paper is devoted to the investigation of characteristics for arrival process, controlled with the Markov chain. The construction of the flow, controlled with the Markov chain, is based on the controlled semi-markov process. The theorem about stationarity of the given arrival flow is formulated and proved. Also the theorem about the fractional-linearity of the distributions and mathematical expectations of direct time of returning and back time of returning, concerning the measures defining a strategy of control, are proved.
Keywords: controlled semi-markov process, Markov chain, stationary arrival process, fractional-linear functional.

Functional reliability. The theory and practice

• Krasnikov A.K., Krasnikova V.A., Matis S.V.
  HASH COLLISION ATTACK PROTECTION USING RANDOM VALUES

In article the problem of cryptographic firmness of the systems using hesh-functions the information is considered (examined). The method providing additional protection against potential danger, connected with use of collisions of unilateral hesh-functions is offered.
Keywords: cryptographic systems, information security, hash collisions, cryptographic, random values, alghorithms.

Functional safety

• Zamyshlyaev A.M., Ermakov A.O., Novozhilov E.O.
  RISK ASSESSMENT MODEL FOR PEDESTRIAN INJURY AT PEDESTRIAN RAILROAD CROSSINFS

Pedestrian railroad crossings are one of the most potential sources of danger on rail transport. Therefore risk of pedestrian injury at pedestrian railroad crossing is a high-priority risk and it requires a great deal of attention during implementation of risk management. This article deals with model definition for risk assessment. Modeling of pedestrian and train appearance at railroad cross using theory of impulse fluxes is considered, probability analysis of adequate pedestrian facilities for danger evaluation using Event Tree Analysis is examined and effect of protective distance between pedestrians and trains is taken into account. Consequently, risk assessment model for pedestrian injury at pedestrian railroad crossings is proposed.
Keywords: individual risk, risk of injury, pedestrian railroad crossing, theory of impulse fluxes, event tree analysis.

Well forgotten

• Shubinsky I.B.
  STRUCTURAL REDUNDANCY IN INFORMATION SYSTEMS. MARGINAL ASSESSMENTS

The article analyzes the conditions for occurrence of latent failures in the individual devices and redundant systems. It is shown that using reservation and natural temporal redundancy can significantly reduce the lifetime of composite element (cluster) failures of information systems.
Many developers have an illusion that increasing the number of standby units and reducing the duration to recover failed system elements can provide an arbitrarily high level of information system reliability. The purpose of this paper is to dispel the illusion and to show that at the achieved levels of constituent reliabilities in information systems there are still combination of duration of latent failures, characteristics of controls and an acceptable time failover, which are determining factors of structural redundancy effectiveness . This problem is solved in an article by the model of system reliability, which adopted an infinite amount of standby units, perfect reliability of switching devices and controls at the limited effectiveness of component failure detections at the limited acceptable lifetime of hidden failures of system elements.
Keywords: structural redundancy, control, latent failure, acceptable time of service interruption, marginal probability of fail-safe operation, the maximum time to failure, the likelihood of timely adaptation to system failures.