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The paper emphasizes the importance of software usability as a key quality characteristic of software during its use. At the beginning of the pa per, a retrospective of formal definitions of usability is given in order to show the evolution of views on usability for more than three decades. To ensure the required quality in use, it is necessary to measure and evaluate many characteristics that affect the usability of software. The paper gives a brief chronology of attempts to identify different dimensions of usability based on its definitions. Since it is not easy to determine the characteristics that contribute most to the quality in use, two methods are applied in identifying the key attributes that affect usability, and they are to be given special consideration when building a model of usability.

Chemical, biological, radiological and nuclear (CBRN) terrorism is a serious problem, and its threat and use lead to a new era of terrorism: the epoch much more dangerous than any of the previous periods and the terrorism no one yet knows how to cope with. The disturbing fact is that terrorists can come into possession of weapons of mass destruction. The refore, the goal of the paper is to analyze the probability of CBRN terrorist actions which have highlighted the growing concerns and increasing signs of convergence between terrorism and CBRN unconventional weapons for terrorist purposes. Terrorism today includes technologies available to anyone and anywhere and deployed through innovative solutions where it is also necessary to understand a complex interaction between the dynamic behavior of terrorist groups and the decisions regarding old and new technologies. The prospect of the use of CBRN terrorism has been confirmed by many countries as an acute security challenge that requires an efficient and quick response and reaction. The paper will also explain the importance of understanding the relationship between terrorist groups and non-conventional weapons, as well as difficulties in identifying factors that may cause the escalation. Since the end of 1990s and since the tragedy of September 11, 2001 in particular, government officials of many countries have pointed out the possibility that terrorist organizations eventually can come into the possession of unconventional materials and develop the possibilities of their use against some countries.

В данной работе описаны новое технологическое решение, монтажно-демонтажное устройство для сложно разбираемых деталей. Благодаря своей конструкции, данное устройство имеет широкие возможности применения в области содержания и ремонта инженерных сооружений, таких как: ГЭС, ТЭС, дизельных электростанций, моторной промышленности, турбинных сооружений, а также в процессном производстве. Монтажно-демонтажное устройство отличается универсальностью, простотой в применении, легкостью веса, которая в свою очередь, способствует мобильности и легкому переносу на объекты.The paper presents a new technical solution, a device for dismantling and assembling parts of mechanical plant components which are not easily separable. The device design allows wide possibilities of application in maintenance and repair of hydro power plants, thermal power plants, and diesel electric generators, in motor industry, shipbuilding industry and navy, aircraft industry, and turbines in process industry. The device for dismantling and assembling is universal and easy to use. Its small weight makes it easy to transport to locations with machine facilities.

The aim of the paper is to highlight, if not all, then at least the most important benefits of the application of mathematical modeling in the development of a new solution or in the process of improvement and the optimization of an existing product. The thesis presents the basic principles of the model creation without providing a detailed mathematical interpretation of the process; therefore, the model includes a substantial number of unknown or approximately known parameters and it is not possible to create a model of the transparent cybernetic box type. In order to achieve a synthesis of the model and the experimental results, it is necessary to apply the optimization methods for the identification of unknown model parameters. The thesis presents the experimental results along with the results of modeling and identification as well as the analysis of the process of identification of unknown model parameters.

The paper proposes a hybrid model, FAHP-MABAC. The fuzzyficated Saaty's scale with the AHP method (FAHP) is used for defining the weight coefficients of criteria. The MABAC method is applied in evaluating and ranking the alternatives. This hybrid model is developed in order to support decision making while selecting locations for the preparation of laying-up positions (facilities intended for concealment, protection and maneuvering of military ships).

This paper presents six critical infrastructure sectors: electric power systems, energy sources and supply, manufacturing, transport and storage of hazardous substances, traffic and transportation, information- telecommunication infrastructure, and supply with basic viands. The sources of adverse unwanted events due to accidents, technical faults, natural disasters, and human error are presented. Prediction and prevention of these events are explained in details.