Damir Šoštarić

GeoHash and UUID identifier for multi-agent systems

This paper documents the case to address the distributed data storage and widely used unique identifiers which are in use from the beginning of databases and backend systems. The importance of uniqueness for object system identifiers is crucial for efficient data retrieval, storage and comparison. We are representing the new method for objects tagging using synergy mechanism between well known Geohash algorithm and Universally Unique Identifiers we call GHUUID (Geohash+UUID) gaining the agent system spatio-temporal identification of all data available. Multi-Agent systems in their nature strongly rely upon distributed databases across vast amount of data. Some of the interoperability issues are solved with usage of semantic web principles which can be cumbersome to implement and maintain. Most systems need the basic space-time correlation which can be the corner stone for the efficient analysis and data aligning regardless of objects stored and their nature.

User authorization system using ZigBee WSN and AVR architecture

This paper shows a development of an RFID (Radio Frequency IDentification) user authorization (access control system) using wireless ZigBee communication network. The system is designed with the topology of one Master and multiple Slave nodes. Idea is to manage a data base on the Master node which is connected to the Slave nodes through a wireless link. Slave node consists of an RFID reader, LCD touch screen and XBee wireless module. Master node communicates with the LabView application through an Ethernet interface. A program development is shown for both nodes, including all the peripheral modules. The proposed systems major advantage over the existing systems is wireless communications. Wireless network uses XBee wireless modules and can be formed as a mesh network, where an end node server as a router, thus extending the range of the network.

Power consumption and RF propagation analysis on ZigBee XBee modules for ATPC

Wireless Sensor Networks (WSN) are used in various fields with the purpose of establishing low cost network for data exchange. An important aspect in ZigBee WSN study is the reduction of node power consumption in order to reduce the overall power consumption of a network and to reduce the induced CO2 emissions. One approach in power consumption reduction is the Adaptive Transmission Power Control (ATPC), where the end nodes reduce their transmit power in certain conditions. This paper analyses the impact of adaptive power control on the power consumption of Digis XBee PRO WSN modules. To determine the conditions for adaptive power control, this paper presents measurements analysis for indoor RF propagation in order to determine the minimum received signal strength for high data transfer reliability. Sequentially, the impact of radio irregularity on the received signal is shown against numerous factors, and the proposed method for adaptive power control is discussed. It is shown that by implementing ATPC the reduction in power consumption is evident while retaining the data transfer reliability.

JavaScript virtual web page for wireless sensor node under AVR microcontroller architecture

This paper presents a developed wireless sensor node with an embedded JavaScript virtual web page implemented in the AVR microcontroller architecture. The presented design is capable of operating in real-time environment and has an improved performance with respect to the previously developed HTML virtual page. The major advantage of the presented system over the existing ones is the fact that the remote monitoring and control system is fully integrated in the microcontroller. The microcontroller is accessible over the Ethernet and with an integrated virtual web page it can replace the web server commonly used in similar systems. This feature makes the presented design extremely cost effective.

Response surface methodology based power consumption and RF propagation analysis and optimization on XBee WSN module

One of the most important issues in wireless sensor networks (WSN) is reduction of power consumption, prolonging the network lifetime (for battery powered networks) or reducing the induced

Multi-agent power management system for zigbee based portable embedded ECG wireless monitoring device with labview application

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Reliability of Welding Parameters Monitoring System

CO2 emissions (for grid powered networks). Power consumption reduction can be achieved in various ways: transmitter power control, duty cycling, data reduction and others. This paper analyses the impact of several parameters on power consumption of Digi’s XBee PRO of shelf WSN modules. To determine the conditions for transmitter power control, this paper presents measurement analysis for indoor RF propagation in order to determine the minimum received signal strength for high data transfer reliability. Measurement analysis is conducted using response surface methodology and the conclusions based on the respective measurement results are given resulting in a mathematical model of the node’s power consumption. Also, optimization of power consumption is shown for various parameters using desirability functions, where optimal parameters for minimum power consumption are presented.

Power consumption of video decoding on mobile devices

The paper presents hardware design of self-balancing vehicle with integrated GPS tracking system based on Android API (Application programming interface). XBee PRO S2B module is used in identification process of existing solution (Segway) based on programmable WSN (Wireless sensor node/network). Control and monitoring system of laboratory experimental solution is based on AVR microcontroller architecture. Measured parameters data from 3-Axis (Gyroscope and Accelerometer) is recorded in database for analysis. After the design of laboratory experimental hardware solution, process identification is confirmed with mathematical model [1]. Controller and motor driver board is separated in two hardware versions. Each version has different kind of sensors and actuator electronics. Possibility of IEEE 802.15.4 (ZigBee) MASH is considered for network of multiple vehicles. Communication between embedded device (vehicle controller) and Android application uses RFCOMM and SPP interface based on Bluetooth protocol. Additional integrated GPS receiver in embedded device gives much better results in regarding coordinates than integrated GPS receiver in Android smart mobile phone.