Excavations on the Northern Terrace at Golemo Gradište, Konjuh, 2007-2010

This article serves at the preliminary excavation report for the activities carried out during those four seasons

Stability of fuzzy matrix games for conflicts: A model with uncertainty preference scheme

Dimirovski, Georgi M. (Dogus Author) -- This article belongs to a special issue-12th IFAC Workshop on Supplementary Ways for Improving International StabilityIn societal system disputes and in direct conflict of interests, in particular, the decision making faces a basic situation resembles a combat-like situation (Figure 1). For each of the opponents (‘players’) has in mind and carries out own missions in the societal environment (Figure 2) Furthermore, two or more parties need to make decisions with fully or partially conflicting objectives when involved in a dispute or open conflict. And yet, by and large, decisions must be made under risk, uncertainty, and incomplete or fuzzy information based on adaptive perception knowledge (Figure 3), which may imply large amounts of linguistic and probabilistic information with missing data. In the case of two opponents, the synergy of fuzzy approach and matrix games seems rather effective for modelling such multi-criteria conflicting situations. This synergy is feasible provide the game equilibrium stability concept is conceived in compliance with an adequate uncertainty preference scheme of decision making. In the case of two scenarios or states of a conflict, the preference scheme for a given participating decision-maker has to include components for handling cases of one state strict preference over another state, equal preference between the states, and also uncertainty preference. The fuzzy modelling based procedure is employed to take into account some of the subjective attitudes of the decision makers that are difficult to model using classical game theory

Enhanced control of electrical power system oscillations by GA optimized damping controller

Dimirovski, Georgi M. (Dogus Author) -- Conference full title: 2010 14th International Power Electronics and Motion Control Conference (EPE/PEMC 2010) : Ohrid, Macedonia, 6 - 8 September 2010A genetic algorithm based optimization technique for optimum design of power system damping controller in a multi-machine power system has been developed. In this technique, the genetic algorithm involves an objective function that is based on the integral of squared-time- squared-error criterion. Parameters of the power system stabilizers are tuned via simulation experiments based on a non-linear model of the system. The dynamic performance has been investigated under both small and large disturbance perturbation, and compared with the case of conventional optimization using phase compensation. Simulation experiments have demonstrated the proposed genetic-algorithm optimized power system stabilizers do enhance quality dynamic performance over a wide range of operating conditions by effectively damping both local and inter-area oscillation modes.ELEM, Repub. Macedonia Chamb. Certif. Archit. Certif. Eng

Differential game model and its solutions for force resource complementary via Lanchester square law equation

Dimirovski, Georgi M. (Dogus Author)This paper investigates the warfare command game problem on both sides with force resource complementary in the fixed time. Under some moderate assumptions, force resource complementary differential game is proposed,which ensures that the optimal strategies are obtained based on Lanchester square law equation, and the optimum conditions are given by the quantitative analysis. In analyzing and solving the optimal strategies of an numerical example, feasibility and effectiveness of the model and the approach is demonstrated. The research results may provide a theoretical reference for combat command decision making and games

Passivity and feedback equivalence of switched nonlinear systems with storage-like functions

Dimirovski, Georgi M. (Dogus Author) -- Conferrence full title: 2010 IEEE International Conference on Systems, Man and Cybernetics, SMC 2010; Istanbul; Turkey; 10 October 2010 through 13 October 2010This paper addresses the issues of passivity and feedback equivalence for switched nonlinear systems via multiple storage functions. The concept of storage-like functions for switched systems is presented. A sufficient condition for passivity of the switched nonlinear systems is given via multiple storage functions under some switching signal. Then, the result is extended to find conditions under which the switched system is feedback equivalent to a passive switched system

Feedback passivation of switched nonlinear systems using storage-like functions

Dimirovski, Georgi M. (Dogus Author)This paper addresses the issues of passivity and feedback passivation of switched nonlinear systems via multiple storage functions. The concept of storage-like functions for switched systems is presented. A sufficient condition for passivity of switched nonlinear systems is given via multiple storage functions under some switching signal. Then, the result is extended to find conditions under which a switched system is feedback equivalent to a passive switched system. Furthermore, passivity of switched cascade systems is investigated

Novel AQM algorithm employing observer-based SMC for efficient internet congestion prevention

Dimirovski, Georgi M. (Dogus Author) -- Conference full title: 2010 IEEE International Conference on Systems, Man and Cybernetics, SMC 2010; Istanbul; Turkey; 10 October 2010 through 13 October 2010.An active queue management (AQM) scheme employing state observer and sliding mode control (SMO-SMC) is designed in this paper in order to overcome congestion problem in TCP communication networks. First, sliding mode observer is designed for input delay network system; a sufficient condition is given for the existence of such an observer in terms of linear matrix inequality. Then, on the grounds of estimated system state vector, a controller is synthesized by using the sliding-mode control theory combined with the reaching law technique. The reachability condition in such a SMO-SMC AQM scheme is also discussed. The stability and robustness of the proposed control scheme are then validated for different network scenarios using Matlab/Simulink. Simulation results for the single-bottleneck benchmark network confirmed the proposed scheme achieves high-quality performance as well as outperforms the previous observer-based sliding-mode and traditional controllers

Sliding mode controller employing RBF-ANN for vehicle anti-lock braking system

Dimirovski, Georgi M. (Dogus Author) -- Conference full title: 2010 14th International Power Electronics and Motion Control Conference (EPE/PEMC 2010) : Ohrid, Macedonia, 6 - 8 September 2010A sliding mode controller employing the RBF neural network is designed for the anti-lock braking system in automotive technology according to the requirement that the braking process must be fast and robust. The usual drawback of control chattering occurred in the classical sliding mode control can be alleviated with the proposed control scheme. Also the robustness of adaptive control system employing neural network is improved to some extent. Simulation investigation for scenario of vehicle activating brakes on dry road situation is carried out using Matlab/Simulink platform. Simulation results demonstrate both feasibility and effectiveness of the proposed ABS control scheme.ELEM, Repub. Macedonia Chamb. Certif. Archit. Certif. Eng

Investigating epidemic diseases characterized by vertical transmission and contract: Cellular automata computational model

Dimirovski, Georgi M. (Dogus Author) -- Conference full title: IFAC International Workshop on "Supplemental Ways for Improving International Stability", SWIIS 2010 - Proceedings; Prishtina, Kosovo; Serbia; 27 October 2010 through 29 October 2010A computationally and theoretically new model based on cellular automata is developed to generate descriptive emulation of epidemic disease processes, a particularly prevailing phenomenon in developing countries that may cause dramatic events. The feature phenomena of vertical transmission and contract of epidemic diseases are accounted for. Thus the proposed model captures the essence of the epidemic dynamics as demonstrated by the simulation experiments. The proposed model can serve as a background basis for developing more sophisticated models and algorithms to simulate scenario of real-world epidemics based on recorded data.IFAC TC 4.4 - Cost Oriented Automation, IFAC TC 9.1 - Economic and Business Systems, IFAC TC 9.3 - Developing Countries, IFAC TC 9.4 - Control Education, IFAC TC 9.5 - Suppl. Ways of Improving Inter. Stability, International Federation of Automatic Control (IFAC