Damir Zrno

Cogito test-bed - wireless research evolved

With each ensuing generation, radio networks are envisioned to support more advanced and differentiated services, enabling new user applications, translating therefore on the need for more bandwidth.

AGE@HOME: Radio-Enabled Environments for Independent Ageing

Ageing populations is a phenomenon over the world. The challenges of daily living for the elderly form the basis of the independent living platform proposed in this article. The AGE@HOME platform is intended to detect unusual activity or inactivity in a home, and is designed to alert caregivers and public health service providers of critical environmental situations in the home (for instance, abnormally high temperature) or unusual behavioural patterns (for instance, the prolonged stillness of a resident). The platform taps into the potential of combining automatic data capture, identification, and sensor technology in order to create a simple and non-intrusive care system. The article presents the decision logic that forms the basis of the system, before describing the software program and graphical user interfaces that were developed based on that logic. A random simulation of the software was run, confirming the decision logic as initially conceived. The simulation also verified that the software could be used in a real-life scenario, in which physical sensors provide data in real-time to the central controller.

Matrix based ray-tracing model for indoor propagation

This paper presents a fast and accurate method for indoor signal strength prediction. Method is based on pathloss precalculation for the whole coverage area of an access point in free space. Resulting matrix and object masks are used to calculate signal strength for all points simultaneously minimizing the number of needed calculations and reducing prediction time significantly. Also discussed is the upgrade to 3D prediction.

Innovative RF localization for wireless video capsule endoscopy

Radiofrequency (RF) localization is used in many fields of daily routine of almost everyone. It is becoming crucial application in many fields, starting from industry to everyday life. Location is calculated using radio waves in many applications such as GPS system, indoor localization using WLAN system, localization based on mobile network parameters like A-GPS system, or localization in warehouses using RFID tags. In this work, we present radiofrequency localization of endoscopic smart pill inside human body used for visual imaging of human gastrointestinal (GI) tract. This kind of visual imaging can bring significant benefit to the medical doctors and patients, if there would be a possibility to localize the pill, while moving through the GI tract. Frequency band proposed for this application is MedRadio band (401 - 406 MHz) and ISM band (2.4 GHz). Finally, the patients and medical staff would welcome standardization in the field of endoscopic pill and its localization.

SAR simulation of a mobile phone in a hand-held position

SEMCAD is an electromagnetic simulation platform based on the finite difference time domain method, FDTD, with an especial feature of calculating specific absorption rate, SAR. SAR is a value corresponding to the power absorbed by the human tissue while exposed to microwave radiation. For antenna designers and cellular phone companies, this value is limited and consequently it is an important parameter in the antenna design process.

A novel method for electromagnetic dosimetry related to human exposure from short-range devices

A novel method for electromagnetic fields dosimetry related to human exposure from short-range devices is presented. The method is based on the kind of ray tracing, specifically the beam tracing.An example of WLAN human exposure assessment has been presented.