Electromagnetic pollution caused by mobile communication devices, a new form of environmental pollution, has been one of the most concerning problems to date. Consequences of long-term exposure to the electromagnetic radiation caused by cell phone towers are still unknown and can potentially be a new health hazard. It is important to measure, analyze and map the electromagnetic radiation levels periodically because of the potential risks. The electromagnetic pollution maps can be used for the detection of diseases caused by the radiation. With the help of the radiation maps of different regions, comparative analysis can be provided and distribution of the diseases can be investigated. In this article, Global System for Mobile communication (GSM)-based electromagnetic pollution map of the Rize Providence, which has high cancer rates because of the Chernobyl nuclear explosion, is generated. First, locations of the GSM base stations are identified and according to the antenna types of the base stations, safety distances are determined. Subsequently, 155 measurements are taken during November 2014 from the nearest living quarters of the Rize city center in Turkey. The measurements are then assessed statistically. Thenceforth, for visual judgment of the determined statistics, collected measurements are presented on the map. It is observed that national limits are not exceeded, but it is also discovered that the safety distance is waived at some of the measurement points and above the average radiation levels are noted. Even if the national limits are not exceeded, the long-term effects of the exposition to the electromagnetic radiation can cause serious health problems.
In this paper, a bistatic passive radar receiver system named “Coherent‐scatter Atmospheric Passive Radar Imager (CAPRI)” is described. It is primarily designed to study the dynamics of the upper atmosphere by utilizing “transmitters of opportunity” as the RF target illuminators. CAPRI is constructed using the open source software‐defined radio toolkit, GNU Radio, to meet the signal processing requirements in combination with the open source hardware, Universal Software Radio Peripheral 2, for data acquisition. The resultant system is highly flexible, and we present the details of the design as well as a performance analysis. CAPRI will be deployed in Peru, near the magnetic equator, for long‐term operations in the area. FM stations near Lima, Peru, will be utilized with the targets of interest being the equatorial electrojet and the spread F. The results will then be compared to the Jicamarca Unattended Long‐term investigations of the Ionosphere and Atmosphere (JULIA) radar data, and CAPRI will be used to improve the simultaneous time and spatial coverage in the region in a more cost‐effective manner.
Placing surveillance receivers on passive radar systems is a complex task because of the dependence on third party vendors. This paper presents an efficient and robust algorithm for positioning passive radar surveillance receivers for the intended coverage based on the available transmitters of opportunity in the area. First, by using the topology maps of the area of interest, depending on the expected targets and available transmitters, visibility maps of the terrain is generated with a line of sight algorithm. Then, in terms of the position and the orientation of the targets, the bistatic radar cross sections are determined. Finally, based on the bistatic radar cross sections of the targets, antenna characteristics, visibility analysis and received power levels, the optimum location for the surveillance receiver and the best transmitter of opportunity to be employed is decided. A practical scenario by using frequency modulation radio transmitters is realized in the manuscript for the rapid deployment of a mobile passive radar system. It is shown that on a terrain with multiple transmitters, depending on the characteristics of the transmitters and intended coverage, an optimum location for the surveillance receiver can be found for rapid deployment.
The need to regularly record student attendance in education and training institutions and the time lost in this period is a problem. At the same time, different problems can arise due to lost or forgotten attendance sheets. In these institutions, student and faculty member information is shared via a web service and used in cafeterias, door entrances etc. In addition, the information of the enrolled classes and the curriculums created accordingly are also part of the electronic information systems. An electronic attendance system, which can be
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