PSI - Issue 22

Jerzy STANIK et al. / Procedia Structural Integrity 22 (2019) 334–344 "Author name" / Structural Integrity Procedia 00 (2019) 000 – 000

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Introduction Infrastructure, reliability and security – what is the link between these three terms? One could answer shortly: one without the second or third is flawed, sometimes it cannot even exist - in the modern world infrastructure is necessary to ensure broadly understood security and functional reliability of citizens and states, and infrastructure deprived of safety or reliability will not fulfill its role nor deliver its pledges. Therefore, in the modern economy infrastructure plays a key role. The rapid development of technical infrastructures (IT) witnessed in recent years is significantly ahead of the knowledge about the organization of quality assurance and security as well as risk management in such systems. There is also a lack of formal and commercial models of maintaining the required level of IT reliability and security as well as general methods of formulating and solving tasks to control current usefulness features in these infrastructures, aimed at maintaining the required level of risk of losing basic IT features. Difficulties in providing risk management formulas and rules for controlling the current level of IT usefulness primarily result from the specific properties of engineering infrastructures, which today constitute the basic equipment of various corporations. The collection of specific IT properties may include, among other things: IT complexity, occurrence of complicated emergency situations caused by damage, lack of systems supporting reliability and functional safety defined by applicable standards, lack of proper mechanisms for controlling current IT usefulness properties. The purpose of this article is to determine the possibilities and propose a way to use them to ensure the maintenance of the required level of functional reliability and functional security as well as an acceptable level of IT risk through the current control of the utility properties of its elements/systems. In addition, this article is an attempt to answer the question: “Is it possible to achieve the required level of functional reliability, security while maintaining an acceptable level of I T risk in relation to its basic features of usefulness as well as the elements of critical infrastructure”? According to the authors, an acceptable level of risk can be achieved by making the right control decisions, initiating the generation of appropriate functional configurations and IT security configuration. The ability to take control decisions determines the existence of a particular control system for IT usefulness properties. The process of establishing subsequent sets of engineering infrastructure configurations is called the reconfiguration mechanism. The proposed concept of ensuring functional reliability, functional safety and maintaining the required level of risk, taking into consideration the impact of not only the spectrum of hazards and vulnerabilities of infrastructure, but also changes in environmental and operational conditions of IT, is the authors` own suggestion. 1. Description of engineering infrastructure for controlling its utility properties, reliability and security The term “engineering infrastructure”, despite the fact that it has been functioning in various (Polish) glossaries for many years, is not universally recognized and is therefore an ambiguous term. The reason for this is, above all, the generality of the definition, allowing quite a number of interpretations. The most general definition of IT under this concept defines a set of deliberately isolated elements or organizational and functional systems that perform certain tasks according to the mission adopted. The main distinguishing features of any IT are (Zalewski, 2015):  it is of strategic importance for the economy and society - it is indispensable for their functioning, forms foundation of sorts;  refers primarily to systems, processes, resources and services that condition its functioning in accordance with the adopted mission,  there are strong relationships between infrastructure and security, reliability and risk. Such isolated elements (systems, processes, resources) remain in specific relations and systemic relationships with each other, which enables them to perform a common mission for which a given engineering infrastructure has been established. For the purposes of this article, the engineering infrastructure (IT) model has been defined as follows: = < Ε , ⊆ Ε × > → (1) where: IT – engineering infrastructure, Ε – set of engineering infrastructure elements,

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