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Fruzsina Horváth and László Pokorádi

Abstract

During technical education it is a very difficult yet essential task to develop the good logical engineering thinking of students or pupils. One main part of this thinking is the determination of the optimal set of required input parameters for the calculation task mentioned above. The LogTreeMM (Logical Tree of Mathematical Modelling) method can help to solve this task. The aim of this paper is to show modification of the LogTreeMM method to determine the required parameters of a mathematical model by a simple case study.

Open access

Arkadiusz Woźniak

Abstract

The evaluation of the impact of contamination in breathing air intended for hyperbaric purposes is essential both for practical and theoretical reasons. The quality of breathing air and the breathing mixes obtained on its basis is of crucial importance with regard to divers’ safety in the course of underwater works. The existing contaminants, as well as substandard quality gases have an adverse impact on divers’ health and life, both in terms of the physiological impact on the body, and fire hazards in hyperbaric complexes. In the process of breathing air production we deal with a few sources of potential contaminants stemming from technical measures. The human body is also responsible for the release of contaminants in hyperbaric conditions. The article presents the above issues and provides insight into existing threats.

Open access

Andrzej Felski and Marta Gortad

Abstract

At present jamming is considered one of the main threats to a GPS receiver’s user, both in dynamic and stationary conditions, and especially regarding telecommunication synchronization. Threats stemming from the use of cheap jammers, more and more commonly referred to as Personal Protecting Devices, available on the Internet, are especially dangerous. Despite the formal ban on using them, there is evidence that they are in common use. Therefore the problem which has hitherto been considered marginal needs to be urgently investigated. Reports dealing with investigations on jamming focus mostly on analyses of effects of various jammers on receivers. This article presents part of the results of experiments focused on the effects and it shows that the effects of jamming when the same device is used depend on both the receiver and the antenna it employs.

Open access

Maurice Dawson and Pedro Manuel Taveras Nuñez

Abstract

Many developed countries are placing resources to combat the growing threats in cyberspace, and emerging nations are no different. Since 2016, the Dominican Republic is undergoing massive changes within the current government to prioritize cybersecurity through laws, policies, and doctrine. This initiative is causing politicians, industry, and even government entities such as the national police to start the journey to begin to fully understand what are the issues in cybersecurity as they apply to the nation. It is essential that the security challenges and problems identified are addressed through a process of discovery while mitigating risks. This paper is to present those challenges and offer solutions that can be used to achieve an acceptable level of cyber risk.