BLE-Based Indoor Tracking System with Overlapping-Resistant IoT Solution for Tourism Applications.

In this paper, an overlapping-resistant Internet of Things (IoT) solution for a Bluetooth Low Energy (BLE)-based indoor tracking system (BLE-ITS) is presented. The BLE-ITS is a promising, inexpensive alternative to the well-known GPS. It can be used in human traffic analysis, such as indoor tourist facilities. Tourists or other customers are tagged by a unique MAC address assigned to a simple and energy-saving BLE beacon emitter. Their location is determined by a distributed and scalable network of popular Raspberry Pi microcomputers equipped with BLE and WiFi/Ethernet modules. Only simple triggered messages in the form of login records (LRs) are sent to a server, where the so-called path vectors (PVs) and interest profile (IPr) are set. The authors implemented the prototype and demonstrated its usefulness in a controlled environment. As it is shown in the paper, the solution is highly overlap-resistant and mitigates the so-called multilocation problem.

[Physical and mechanical properties of hydroxyapatite plasma sprayed materials applied in implantology]. / Fizykomechaniczne wlasciwosci materialów hydroksyapatytowych natryskiwanych plazmowo stosowanych w implantologii.

BACKGROUND: The research involved the evaluation of physical and mechanical properties of hydroxyapatite (HAp) bio-ceramics sprayed on titanium substrate of the type Ti-grade 2 (CP-Ti) by means of the plasma method. An innovative method of coating is applied when using implantology for healing bone defects in the body. MATERIAL AND METHODS: Hydroxyapatite coating was prepared in order to conduct research. The powder was made using wet-chemical technology consisting in separating the solids from the solution. Next, a titanium substrate was prepared, onto which hydroxyapatite was applied with a plasma technique. RESULTS: As a result of the research it has to be noted that the properties of the obtained coating may be used for covering large surfaces of implants of any shape. CONCLUSIONS: During the research into the physical and mechanical properties of hydroxyapatite composites it has been observed that they show sufficient mechanical properties to be used in implantology. The further aim of the research will involve selecting technological parameters of spray coating in order to increase adhesion and cohesion of HAp coatings. Med Pr 2018;69(6):651-661.