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One of the main issues in wireless sensor networks is energy efficiency. Most of the energy is used for wireless transmission. To reduce an amount of data being sent, if a particular compression algorithm is used, than it can significantly reduce a power consumption and increase node's operating lifetime. Presented in this paper is a research, in which the possibility of use of IEEE 802.15.4 wireless...
IEEE 802.15.4/ZigBee represents set of comercial standards targeted for implementation in low power wireless applications, such as wireless sensor networks. OPENZB model was used for simulation of IEEE 802.15.4 networks using OPNET Modeler. We upgraded this model by adding functionalites which enabled testing this kind of networks under real-world scenarios such as presence of hidden nodes and cluster-tree...
The most difficult task when using simulation tools for communication networks and protocols is usually represented by the modeling of applications and their protocols for different networkspsila technologies. For this reason, the need for simulation tools appeared, which could connect real communication applications and networks with simulated networks. This paper presents some simulation results...
Contemporary communication is becoming more and more complex and extensive. Network planners very often use simulations tools for reducing the costs of planning, constructions, and maintenances. Modeling network traffic is also a very important challenge regarding simulation tools, especially the modeling of measured traffic as to which would be the best approximation of measured traffic in real network...
Routing is a problem domain with an infinite number of end-solutions. One possible approach is to solve such problems using of graph theory. This paper presents a mathematical analysis for a routing problem, based on circular graphs, where the focus is on searching for the shortest path on a circular graph. The theoretical section will be argued by an example where we look for the fastest path and...
A lot of expert knowledge for correct simulation realization and result interpretation is needed in tactical network simulations using an OPNET Modeler. So we have built a system, which would simplify the processes of simulation preparation and the interpretation of simulation results. The system for tactical network simulation has been designed as three assisting program modules. TPGEN takes care...
The simulation of tactical networks is an important task in the process of military missions planning. Such methodologies assure a higher probability of success for tactically critical operations on military fields. The manual analysis of simulation results is a very time-consuming task and requires expert knowledge to correctly interpret these results. This paper briefly defines those concepts of...
Military mission success probability is closely related to careful planning of communication infrastructures for Command and Control Information Systems (C2IS). Over recent years, the designers of tactical networks have realized more and more need for using simulation tools in the process of designing networks with optimal performances, in regard to terrain conditions. One of the most demanding simulation...
Analysis and modeling of telecommunication networks by simulations has become one of the main tools in the process of telecommunication-networkspsila planning and upgrading. Knowledge regarding the statistical modeling of network traffic is very important. Here we tend towards modeled network traffic which would be the best possible approximation of the measured traffic. Throughout our research in...
Margento is a mobile payment system, enabling customers to purchase products from vending machines or in retail stores, using their mobile phones. It is designed to complement existing credit and debit card systems, by enabling all mobile phone users to turn their phones into the payment instruments of their choice. This system is based on Ultrapsilas patented mobile payment terminal using the one...
This article represents those basic conditions which must exist for such systems to be classified as "expert systems". Our goal is oriented towards construction elements for an expert system; where we need to give a detailed description of each constructed part. If we want to construct an expert system, we must learn certain basic steps, which are very important during the design phase....
The paper describes basic principles of packet classification based on geometric classification algorithm. Packet classification is very important in IP networks for arranging different priority streams regards to importance of separate data. Our goal is oriented towards comparison abilities between geometric packet classification algorithm and algorithm based on decision trees. To be comparison procedure...
Over the last ten years, new models of network traffic in the Internet environment have been developed, which are different to traditional models such are Poisson and Markov. This paper describes the estimating of measured self similar traffic's parameters for modeling in OPNET. Network traffic was captured using a sniffer. We estimated the Hurst parameter (H) for the arrival process, and the fitted...
Slovenia is a member of MIP (multilateral interoperability programme), the task of which is to provide interpretations of national C2IS systems for successfully harmonizing joint action by international military peacekeeping forces. Interpretability within MIP is carried-out by a unified model based on controlled data replication between the databases of C2IS systems. Systematics IRIS replication...
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