In this paper, we analyze an arbitrary heterogeneous cellular network applying stochastic geometry, and propose a modified model for assessing network spectral and energy efficiency. With this regard, we recognize that, in practice, determining Signal-to-Noise-and-Interference Ratio (SINR) as the key performance indicator, requires complex field test equipment, which might not be available or affordable. Therefore, we propose here a simple model that is based on the relatively easy measurable Bit-Error Rate (BER), whose degradation caused by various impairments is considered here as if it was due to the according additive white Gaussian noise (AWGN), thus abstracting any specific non-AWGN distortion. The proposed analytical model is verified by ns3 software network simulator, whose test results are found to match the corresponding estimated values. This indicates that both spectral and energy efficiencies of small-cell networks are higher than in larger-cell networks, even more for heterogeneous two-tier networks.

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Background: For many years, pharmacy and medicine were inseparable sciences, so everything that was done in the field of medicine, that is, treatment, can be related to pharmacy. The history of pharmacy therefore also includes the history of medicine, at least until the 13th century, when pharmacy was officially separated from medicine. Objective: The aim of this study was: to describe the books and monographs that are available on the Internet, which deal with the study of the history of Pharmacy; and to show pharmaceutical history museums around the world and their unique collections of pharmaceutical artifacts. Methods: During the preparation of this paper, a descriptive method of analysis from the available literature was used. The analysis of available literature included professional books, monographs, articles and other literature available on online browsers. Results and Discussion: Today there are a large number of societies, academies, associations and foundations dealing with the history of pharmacy. Also, a lot of books, monographs and scientific papers published in on-line databases. The goal of each organization is the research of historical facts in the field of pharmacy and medicine that will be shared with professionals, but also persons who are not from the profession (doctors, librarians, archaeologists, archivists). A large number of museums have been opened for the history of pharmacy, and almost every developed country has such a museum. Such museums represent a national treasure, because they preserve the valuables of pharmacy from the territory of the country, as well as the world.

Background: The rich history of pharmacy in Bosnia and Herzegovina has been sporadically dealt with systematically, except by enthusiasts and researchers. The only book on this topic was published in 1958, and after the aggression against Bosnia and Herzegovina, the history of pharmacy was treated mainly as part of the history of medicine. The lack of a culture of memory and a systematic approach to historical heritage brought together a group of experts who deal with this topic in more detail and collect available historical relevant material. Pharmacy as a highly regulated health discipline also in Bosnia and Herzegovina is a legacy of legal acts and documents that depict different periods and the development of pharmacy itself under the influence of circumstances and legislation. Objective: The aim of this paper is to show the development of legislation related to the pharmaceutical sector in Bosnia and Herzegovina through the historical periods of its development. Methods: This is retrospective research based on internet sources, archives and publications available in libraries. Results and Discussion: The available legal regulations and documents through five periods of pharmaceutical development were analysed, from which it can be concluded that the organization of the pharmaceutical industry and its development over time remained stricter. Legal regulations depict the role of pharmacy in the health system, but they also represent sources for further research in this area, and constitute important historiographical material. The analysis of legal regulations speaks volumes about the way pharmaceutical activity is organized, so it is possible to follow the appearance of the first pharmacies, pharmacists, requirements for the quality of medicines, production and the modern role of pharmacists in the health system. Pharmaceutical legislation will certainly be the subject of future negotiations on the accession of Bosnia and Herzegovina to the European Union, and harmonization with the acquis of the EU is expected in the coming period.

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Dysphagia, commonly referred to as abnormal swallowing, affects millions of people annually. If not diagnosed expeditiously, dysphagia can lead to more severe complications, such as pneumonia, nutritional deficiency, and dehydration. Bedside screening is the first step of dysphagia characterization and is usually based on pass/fail tests in which a nurse observes the patient performing water swallows to look for dysphagia overt signs such as coughing. Though quick and convenient, bedside screening only provides low-level judgment of impairment, lacks standardization, and suffers from subjectivity. Recently, high resolution cervical auscultation (HRCA) has been investigated as a less expensive and non-invasive method to diagnose dysphagia. It has shown strong preliminary evidence of its effectiveness in penetration-aspiration detection as well as multiple swallow kinematics. HRCA signals have traditionally been collected and investigated in conjunction with videofluoroscopy exams which are performed using barium boluses including thin liquid. An HRCA-based bedside screening is highly desirable to expedite the initial dysphagia diagnosis and overcome all the drawbacks of the current pass/fail screening tests. However, all research conducted for using HRCA in dysphagia is based on thin liquid barium boluses and thus not guaranteed to provide valid results for water boluses used in bedside screening. If HRCA signals show no significant differences between water and thin liquid barium boluses, then the same algorithms developed on thin liquid barium boluses used in diagnostic imaging studies, it can be then directly used with water boluses. This study investigates the similarities and differences between HRCA signals from thin liquid barium swallows compared to those signals from water swallows. Multiple features from the time, frequency, time-frequency, and information-theoretic domain were extracted from each type of swallow and a group of linear mixed models was tested to determine the significance of differences. Machine learning classifiers were fit to the data as well to determine if the swallowed material (thin liquid barium or water) can be correctly predicted from an unlabeled set of HRCA signals. The results demonstrated that there is no systematic difference between the HRCA signals of thin liquid barium swallows and water swallows. While no systematic difference was discovered, the evidence of complete conformity between HRCA signals of both materials was inconclusive. These results must be validated further to confirm conformity between the HRCA signals of thin liquid barium swallows and water swallows.

In GMAW welding, there are several types of metal transfer that are primarily determined by the primary welding parameters. Different metal transfers in an electric arc are characteristic of different applications. In this paper, a detailed characterization of the pulse transfer of metals in an electric arc is performed, including the characterization of parameters and criteria for their selection on the used power source for welding Welbee. For a given Welbee device, the choice of parameters in steel welding is shown, as well as the synergy function that is characteristic of these devices. Welding was performed on structural steels, with previously adopted parameters, accompanied by recording the dynamic characteristics of current and voltage with an oscilloscope. Based on the available literature sources, the existing models for heat input calculation in GMAW pulse welding were analysed in detail. Heat input calculation for welded steel sheets was performed by using one of them, with current and voltage profiles recorded with an oscilloscope. After the experiment, the obtained results were elaborated, and general comments were given regarding influence of parameters on the quality of welded joints.