in the end of twentieth. century and •the .beginning of the third millennium, all political regimes' practically for acquiring legitimacy want to introduce themselves as a democratic system. today there is no question about the truth of the democracy, ;whether that is . fundamentally good or bad? but the question 'is a bout the most efficient and the best form of democracy. nowadays, ...

First-order logic (FOL) is undecidable — that is, no algorithm exists that can decide whether a formula of FOL is valid or not. However, there are various fragments of FOL that are known to be decidable. FO, the two-variable fragment of FOL, is one of such languages [1,2]. FO is a first-order language where formulas have maximally two variables, no function symbols, but possibly do have equalit...

The management process in company networks often imposes the challenging task to select or orchestrate members of the network into a particular set (network actor set) that delivers the "best fit" for an incoming inquiry to the network. The constraints are implied by the given inquiry, company offerings, and the current economical and collaboration status of the network. The companies forming t...

Due to the high demand for pest control in Sri Lankas’ rice paddy cultivation practices, the number of new pesticides has been recently introduced. However, the new pesticides, which are flowing into the agriculture sector of Sri Lanka, appeared to be used by farmers without obtaining proper application guidance from the suppliers or from extension services. As a result, the exposure to harmful...

The management of national parks (NPs) is a challenge because it necessary to en?sure the conservation, improvement, sustainable use natural and other values at NP area, as well NPs? visitors. This paper aims study models in Serbia, compare them with selected countries Southeast Europe region (Slovenia, Croatia Montenegro). In were considered possibilities improving NPs model (institutional fra...

Several models have been proposed for scheduling the preventive maintenance (PM) of complex repairable systems in industry. These are often application-speci"c and some make unrealistic assumptions about stationarity of the process and quality of repairs. We investigate two principal types of general model, which have wider applicability. The "rst considers "xed PM intervals and is based on the...

The article deals with possibilities of utilization of the designed and developed BilPol software system that extremely facilitates, accelerates and specifies the very important initial stage of estimation of coal reserves. The system quickly and transparently compiles and illustrates logs of boreholes and cuttings with indicated seams and benches. In the user-friendly and intuitive graphic env...

ballast as a part of the railway system plays an important role in the operation of the railways and also has a great impact on repair and maintenance activities. hence most of the repair and maintenance activities in traditional railway systems are due to the defections in the ballast layer and therefore most of the maintenance budget is spent on repairing these defects. these repair and maint...