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Search Results: 1 - 10 of 225868 matches for " Rapai? Milan R. "
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Discrete particle swarm optimization algorithm for solving optimal sensor deployment problem
RapaiMilan R.,Kanovi? ?eljko,Jeli?i? Zoran D.
Journal of Automatic Control , 2008, DOI: 10.2298/jac0801009r
Abstract: This paper addresses the Optimal Sensor Deployment Problem (OSDP). The goal is to maximize the probability of target detection, with simultaneous cost minimization. The problem is solved by the Discrete PSO (DPSO) algorithm, a novel modification of the PSO algorithm, originally presented in the current paper. DPSO is general-purpose optimizer well suited for conducting search within a discrete search space. Its applicability is not limited to OSDP, it can be used to solve any combinatorial and integer programming problem. The effectiveness of the DPSO in solving OSDP was demonstrated on several examples.
Sustainable development as a factor in the energy dependency of the European Union
Rapai? Stevan
Medjunarodni Problemi , 2012, DOI: 10.2298/medjp1203339r
Abstract: The main thesis of the author starts with the fact that the Sustainable Development Strategy of the European Union is one of the major long-term reducing instrument of energy dependency of the European Union. This paper gives an overview of the total energy consumption and production in the EU and its energy dependence on imports, mainly oil and gas. In order to meet the needs of sustainable development, the EU aims to cut consumption of crude oil, natural gas and solid fuels, and also to encourage the production and consumption of renewable energy, which would reduce the import of fossil fuels and contribute to energy efficiency. Despite numerous measures in order to achieve sustainable development, crude oil and natural gas remain the most important fuels in the EU, while its total energy dependency has increased over the past ten years. [Projekat Ministarstva nauke Republike Srbije, br. OI179029: Srbija u savremenim me unarodnim odnosima: Strate ki pravci razvoja i u vr ivanja polo aja Srbije u me unarodnim integrativnim procesima - spoljnopoliti ki, me unarodni, ekonomski, pravni i bezbednosni aspekti]
Energy market in European Union and interests of Serbia
Rapai? Stevan
Medjunarodni Problemi , 2009, DOI: 10.2298/medjp0904515r
Abstract: The author deals with energy market in Europe by presenting the gross consumption of energy as well as production of energy within the European Union. The need of EU for natural gas and crude oil is one of the main factors why Russia is still the key player in Europe's energy market. European Union is trying to leave Russia behind by importing crude oil and natural gas from countries like Norway, Saudi Arabia, Algeria, Libya, Nigeria, Iraq, but Europe is still highly dependent of Russian energy. Considering these facts, Serbia recognizes that its economic and political interest is to become a strategic partner with European Union as transit country for Russia's natural gas and crude oil. .
Flexibility of production systems and prepare-finish time
Vuki?evi? Milan R.
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693023v
Abstract: One of the specificities of the large-serial and mass production is the almost neglected percentage of prepare-finish time in the production cycle. In the conditions of today dominant discontinuous production, it becomes a significant element of the production cycle. The eastern (Japan) doctrine of increasing the flexibility of the production systems, is based inter alia also on the extreme reduction of the prepare-finish time. For this reason, the aim of this study was to identify the types and percentages of individual jobs within the group of prepare-finish jobs. The sample consisted of 3 (three) production systems for the production of joinery, with the discontinuous production system. The research shows that the percentage of time of the jobs installation of work instruments, regulation of processing regime, and removal of work instruments is extremely long and that it ranges between 11.83% and 18.93% of the shift time. The reasons of the high percentage of these jobs are the wide range of products and the absence of the rationalisation of prepare-finish jobs. Within the efforts to minimize the effects of disruption and to increase the flexibility of the production systems, the rationalisation of prepare-finish jobs is the unavoidable condition.
Redesign of the cooperation concept in wood processing
Vuki?evi? Milan R.
Glasnik ?umarskog Fakulteta , 2009, DOI: 10.2298/gsf0999007v
Abstract: Cooperation, in combination with specialization, is aimed at the better utilization of resources, shorter production cycle and cost reduction. This means that cooperation and specialization, in addition to technological aspect, also include the organization aspect. The problem in wood processing is the fact that the organization aspect is completely neglected. For this reason, specialization and cooperation cannot reach their goal. The aim of this paper is to point out the significance of the organization aspect. The selection of cooperants cannot be based on the prices and acquaintances, recommendations, etc. There are numerous criteria which can decide the selection of cooperants. The criteria adopted in this paper are the manufacturing price and the storage cost. Based on the multicriteria decision making, it is possible to define the alternative which enables simultaneously the lowest total price and the lowest total own storage costs.
Electrochemical Determination of Melamine on Static Mercury Drop Electrode and on Gold Nano Particle Modified Carbon Paste Electrode  [PDF]
Milan K. Dey, Ashis K. Satpati, A. V. R. Reddy
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.59067
Abstract: An electrochemical method was developed for the determination of melamine (2,4,6 triamino- 1,3,5-triazine) on static mercury drop electrode (SMDE) and on gold nano particle modified carbon paste electrode. Interaction of melamine with Cu2﹢ ion was investigated and the decrease of Cu stripping peak was measured for the determination of melamine using SMDE. Oxidation property of melamine was improved using gold nano particle modified carbon paste electrode. Direct determination of melamine was proposed from the oxidation peak with three sigma detection limit of 0.43 μML﹣1. Recovery in milk powder sample has shown good recovery of melamine using the modified carbon paste electrode.
Proposta de um sistema de medi??o de desempenho aplicado à mecaniza??o agrícola
Peloia, Paulo R.;Milan, Marcos;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000400012
Abstract: the leaders' organizations of several different sectors have as characteristic to measure their own performance in a systematic way. however, this concept is still unusual in agricultural enterprises, including the mechanization sector. mechanization has an important role on the production costs and to know its performance is a key factor for the agricultural enterprise success. this work was generated by the importance that measurement of performance has for the management and the mechanization impact on the production costs. its aim is to propose an integrated performance measurement system to give support to agricultural management. the methodology was divided in two steps: adjustment of a conceptual model based on balanced score card bsc; application of the model in a study case at sugar cane mill. the adjustment and the application of the conceptual model allowed to obtain the performance index in a systematic way, that are associated to: costs and deadline (traditionally used); control and improvement on the quality of operations and support process; environmental preservation; safety; health; employees satisfaction; development of information systems. the adjusted model helped the development of the performance measurement system for the mechanized management systems and the index allows an integrated view of the enterprise, related to its strategic objectives.
Quantitative Structure-Activity Relationship Study of Some Antipsychotics by Multiple Linear Regressions  [PDF]
Danica S. Peru?kovi?, Nikola R. Stevanovi?, Aleksandar ?. Loli?, Milan R. Nikoli?, Rada M. Bao?i?
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.55041
Abstract: The retention behavior and lipophilicity parameters of some antiphychotics were determined using reversed-phase thin layer chromatography. Quantitative structure-activity relationships studies have been performed to correlate the molecular characteristics of observed compounds with their retention as well as with their chromatographically determinated lipophilicity parameters. The effect of different organic modifiers (acetone, tetrahydrofuran, and methanol) has been studied. The retention of investigated compounds decreases linearly with increasing concentration of organic modifier. The chemical structures of the antipsychotics have been characterized by molecular descriptors which are calculated from the structure and related to chromatographically determinated lipophilicity parameters by multiple linear regression analysis. This approach gives us the possibility to gain insight into factors responsible for the retention as well as lipophilicity of the investigated set of the compounds. The most prominent factors affecting lipophilicity of the investigated substances are Solubility, Energy of the highest occupied molecular orbital, and Energy of the lowest unoccupied molecular orbital. The obtained models were used for interpretation of the lipophilicity of the investigated compounds. The prediction results are in good agreement with the experimental value. This study provides good information about pharmacologically important physico-chemical parameters of observed antipsychotics relevant to variations in molecular lipophilicity and chromatographic behavior. Established QSAR models could be helpful in design of novel multitarget antipsychotic compounds.
Model of an Atom by Analogy with the Transmission Line  [PDF]
Milan Perkovac
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47121
Abstract:

Model of an atom by analogy with the transmission line is derived using Maxwells equations and Lorentz theory of electrons. To be realistic such a model requires that the product of the structural coefficient of Lechers transmission lines σ and atomic number Z is constant. It was calculated that this electromechanical constant is 8.27756, and we call it structural constant. This constant builds the fine-structure constant 1/α = 137.036, and with permeability μ, permittivity ε and elementary charge e builds Plank’s constant h. This suggests the electromagnetic character of Planck’s constant. The relations of energy, frequency, wavelength and momentum of electromagnetic wave in an atom are also derived. Finally, an equation, similar to Schrodinger’s equation, was derived, with a clear meaning of the wave function, which represents the electric or magnetic field strength of the observed electromagnetic wave.

Determination of the Structural Constant of the Atom  [PDF]
Milan Perkovac
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.23002
Abstract:

The equations for energy, momentum, frequency, wavelength and also Schr?dinger equation of the electromagnetic wave in the atom are derived using the model of atom by analogy with the transmission line. The action constant A0 = (μ0/ε0)1/2s02e2 is a key term in the above mentioned equations. Besides the other well-known quantities, the only one unknown quantity in the last expression is a structural constant s0. Therefore, this article is dedicated to the calculation of the structural constant of the atoms on the basis of the above mentioned model. The structural constant of the atoms s0 = 8.277 56 shows up as a link between macroscopic and atomic world. After calculating this constant we get the theory of atoms based on Maxwells and Lorentz equations only. This theory does not require Planck constant h, which once was introduced empirically. Replacement for h is the action constant A0, which is here theoretically derived, while the replacement for fine structure constant α is 1/(2s02). In this way, the structural constant s0 replaces both constants, h and α. This paper also defines the stationary states of atoms and shows that the maximal atomic number is equal to 2s02 = 137.036, i.e., as integer should be Zmax=137. The presented model of the atoms covers three of the four fundamental interactions, namely the electromagnetic, weak and strong interactions.

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