Thesis presents active control of reactive mufflers, or so called adaptive muffler, using flow controlled valves. The proposed adaptive muffler is able to adapt to changes in IC engine operating conditions, HVAC operating conditions or chimney systems. It consists of a Helmholtz resonator, expansion chamber and quarter wavelength resonator. Different combinations of the control valves' states at different operating conditions define the main working principle and characteristics of the muffler and consequently its properties as such. To control the valve's position, an active noise control approach was used. Adaptive muffler upgrades the conventional muffler with a variable geometry to extend its working range. Such approach to muffler design eliminates the need for additional mufflers used in IC exhaust systems. Therefore a smaller volume of the proposed muffler enables the same or even better effects as multiple non-adaptive conventional mufflers.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 14240283Sickness absenteeism is a complex and multi-factor phenomenon, which has an important effect on all types of organizations. The costs of sickness absenteeism are substational for all organizations and therefore are decisions for management intervention very logical. Causes od absenteeism are very different. Especially psycho-social factors at the workplace has an important impact on absence behavior. The paper focuses on the sickness absenteeism in state administration and private sector and presents results of research carried out in that field. Results of resarch show that in the last 12 months absent from work was higher by employees in state administration than by employees in private sector. Relations between employees in state administration are worse that between employees in private sector.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 4614574Epilepsy poses a risk for all participants in road traffic; therefore, people with epilepsy do not meet the criteria for an unlimited driving licence. Their driving is affected not only by epileptic seizures causing impaired consciousness and involuntary movements, but also by antiepileptic drugs with their many adverse affects. The experts have not yet agreed on whether people with epilepsy have an increased risk of experiencing a road traffic accident. However, recent data suggest that the overall risk is lower compared to other medical conditions. Scientific evidence forms the basis for legislation which enables all participants in road traffic to drive in the safest possible environment by imposing restrictions people with epilepsy. The legislation that governs epilepsy and driving in Slovenia has been recently thoroughly reformed, thus allowing a less discriminatory management of people with epilepsy. Although people with epilepsy experience many issues in their daily life, including their personal relationships and employment, they often list the need for driving as a top concern in surveys. General physicians play an important role in managing the issues of people with epilepsy.
F.16 Improvements to an existing information system/databases
COBISS.SI-ID: 3993032The causes that lead to sickness absenteeism are numerous. Among the groups of the causes there is a set of factors tied to the individual or his/ her personality traits. The article focuses on the aspect of the correlation between sickness absenteeism and temperament and presents the results of the research carried out in the public administration in Slovenia. The results of the research (February 2015) show that on average the employees who were temporarily absent from work for the fewest days were those with dominant temperament choleric (8.6 days) or phlegmatic (8.7 days), who also account for the largest number of employees in the public administration; those with a sanguine temperament were temporarily absent for slightly more days (10.8 days), while melancholics were absent for the largest number of days (15.8 days). On the basis of the results of the research, we find that in the total number of days of sickness absence we are unable to confirm statistically significant differences between individual employees with regard to their temperament. We can, however, confirm a statistically significant correlation in the overall average number of frequencies of sickness absenteeism among employees with regard to their temperament.
F.22 Improvement to existing health/diagnostic methods/procedures
COBISS.SI-ID: 4707246Stress is a complex psychoneuroendocrinological and immune response of an individual to a stressogenic factor. The most important contemporary stressogenic factors are mental, psychosocial and socio-economic stressors. This especially holds true for occupational stress. Many symptoms, signs and diseases are associated with chronic occupational stress. This article describes different stressogenic factors that lead to occupational stress and two conceptual models of occupational stress (Karasek’s Demand/Control Model and Siegrist’s Effort-Reward Imbalance Model). Reaction to stress can be measured in various ways. This article summarizes the physiology of heart beat regulation and presents heart rate variability as a measurable parameter of stress reaction. Measuring heart rate variability gives us an insight into autonomic modulation of the heart and functioning of the entire autonomic nervous system. We described various mechanisms that lead to end-organ damage due to changes in the autonomic nervous system as a result of work stress as well as several measures to reduce the impact of occupational stress on heart rate variability. Researches have shown that reduced heart rate variability reliably predicts mortality among healthy adults, as well as morbidity and mortality in patients after acute myocardial infarction, in patients with chronic heart failure and mortality in patients with chronic kidney disease.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 279801600