Iran Broadcasting University

In the rapidly evolving landscape of public safety communication systems, the demand for reliable, secure, and energy-efficient solutions is paramount. Traditional public safety radio networks, while effective, often rely on outdated infrastructure that consumes significant electrical energy, leading to inefficiencies and increased operational costs. This paper introduces an energy-efficient intelligent platform for public safety radio networks, leveraging artificial intelligence (AI) and data analytics to optimize energy consumption while maintaining high performance and reliability. By integrating smart energy management strategies, such as dynamic power allocation, predictive maintenance, and renewable energy integration, this platform not only enhances the responsiveness of emergency services but also reduces the environmental impact of public safety operations. The paper explores the architectural design, key features, and benefits of this intelligent platform, highlighting its potential to revolutionize energy consumption in public safety communication systems.

Coded caching reduces peak transmission rates on shared wireless links by pre-storing content at user terminals during low-traffic periods and using multicasting during peak hours. However, most current methods require dividing each file into many segments and sending numerous messages, making these methods impractical for large systems due to complex book-keeping and sub-packetization. This work proposes and evaluates three decentralized algorithms for cache updating using intercepted messages: Max-Pairs, which maximizes expected pairings; a deep-Q-learning (DQL) algorithm for selfish users; and a reinforcement learning scheme that balances service times. These algorithms assume that files are cached as whole units and an uninterrupted stream of user requests. Simulations show that our approaches outperform Uniform Caching and Least Frequently Used (LFU) policies.

Background: Mobile smart phones have become increasingly integrated into the daily lives of individuals in society. Recent studies indicated the considerable role of these devices as reservoirs for various micro-organisms. The objective of this study was to assess the prev­alence of microbiological contamination of mobile phones in general population. Materials and Methods: This cross-sectional study included a large sample of mobile phones of gen­eral population Tehran in 2015. Samples for culture were collected from mobile phones and transported for microbiological identification based on standard laboratory methods. Results: Bacteriological analysis revealed that in total of 5220 sample retrieved, 5180 (98.9%) mobile phone devices were contaminated with bacteria. The most common microorganisms that were isolated include: Staphylococcus epidermidis (63.9), Escherichia coli (12.3%) and Staphylo­coccus aureus (11.4%). Conclusion: The prevalence of mobile phone contamination is high in general population in Tehran. Although most of the isolated organisms seemed to be non-patho­genic, their colonization may endanger certain populations particularly in health care settings. [GMJ.2016;5(2):70-74]

Abstract In the present study, a numerical analysis of turbulent flow in a combustion chamber in 5 milliseconds limited the Reynolds number 16700 by applying a 20 kHz wave from a Bowl-shaped diffusion source over 1 second to process temperature reduction. This study aims to improve the combustion process time and further turbulence of the flow to increase the combustion rate and reduce unburned hydrocarbons in the walls. The k - ω model uses the turbulence–chemistry interaction modeled using the eddy dissipation concept. Two methods have been proposed: relocating the nozzles and applying waves which caused Increasing CO2 combustion from 0.31 to 0.34 by decreasing the distance between nozzles. Also, a spray angle of 45° was introduced as the best angle to reduce the fuel film on the walls and improve combustion. Furthermore, using ultrasound waves, the transfer of flame concentration from the walls to the center of the chamber occurred, which reduced unburnt hydrocarbons on the walls. Wave application improves the flame and creates wrinkles at the edges of the flame, which ultimately leads to a 10% improvement in the performance of the combustion process.

Internet offers countless opportunities that affect students' lives and their career potentials. With the help of Internet, youth development processes are positively encouraged. In order to understand how Internet can influence Positive Youth Development (PYD), this study was carried out with an attempt to identify the relationship between problems of using Internet, income, and PYD with the mediate effects of Internet use gratification among Malaysian youth. A quantitative survey method was used to collect data from 440 students (142 male and 298 female) majoring in science and social science from University Putra Malaysia using stratified random sampling. The results show that there is a mediate effect for Internet use gratification with problems of using Internet and five dimensions of PYD; however, this relationship is not significant for the role of income. In addition, no significant difference was found between science and social science groups. The relationship between Internet use gratification and 5Cs (connection, competence, character, caring, confidence) proved to be significant. There is no statistically meaningful relationship between participants' income and 5Cs except for confidence. There is no significant relationship between income and Internet use gratification. There is also no significant relationship between problem of using Internet and the (5Cs); however, this relationship proved to be significant with Internet use gratification. Implications of the study are also discussed.