Heuristic algorithm for single resource constrained project scheduling problem based on the dynamic programming

We introduce a heuristic method for the single resource constrained project scheduling problem, based on the dynamic programming solution of the knapsack problem. This method schedules projects with one type of resources, in the non-preemptive case: once started an activity is not interrupted and runs to completion. We compare the implementation of this method with well-known heuristic scheduling method, called Minimum Slack First (known also as Gray-Kidd algorithm), as well as with Microsoft Project

CONDITION ASSESSMENT AND STRUCTURAL REHABILITATION OF THE ST. NICHOLAS CHURCH IN CRNA TRAVA

The paper analyzes the structural condition of the church dedicated to Saint Nicholas, which is located in the town of Crna Trava, in the south of Serbia. An architectural analysis of the observed structure is provided, as well as an overview of previous works on it, both research and rehabilitation and conservation. A detailed analysis of the structural system of the church is presented. The analysis and classification of the observed damages was performed, the works on the rehabilitation of the building were presented, and a proposal of further remedial measures was given with the aim of preventing further deterioration of the building

AN ALTERNATIVE DECOMPOSITION OF CATALAN NUMBER

A particular integer sequence derived by the convex polygon triangulation is introduced and investigated. After some underlying results are presented, the forbidden (or improper) integer values relative to the triangulation are concerned. It is understood that the forbidden sequences do not correspond to any triangulation. Some of their properties are presented. These properties are used to count the forbidden values, which is, finally, exploited in stating another decomposition of the Catalan number

Optimizacija parametara sinterovanja debeloslojnih otpornika na bazi Bi2Ru2O7 slojne otpornosti 10 kΩ/sq

Razvoj novih i unapređenje postojećih elektronskih komponenti koje doprinose smanjenju po-trošnje električne energije pogoduju prelasku sa tradicionalnih na obnovljive izvore energije i doprinoseenergetskoj efikasnosti. Debeloslojni otpornici su pasivne komponente koje se sve više kor-iste u pametnim energetski štedljivim kućnim uređjima, LED osvetljenju, upravljanju klima uređajima, električnim trotinetima, sistemima za upravljanje baterijama itd. Zbog toga će u ovom radu biti reči o uticaju parametara sinterovanja na formiranje strukture najčešće korišćenih debe-loslojnih otpornika na bazi Bi2Ru2O7slojne otpornosti 10 kΩ/☐.Development of new and improvement of existing energy-saving electronic components are supporting transition from traditional to renewable energy sources and contributing to energy effi-ciency. Thick-film resistors are passive components that are often being used in energy-saving smart home appliances, LED lighting, air conditioning management, electric scooters, battery management systemsetc. For these reasons, this paper will deal with optimization of 10 kΩ/sq Bi2Ru2O7thick-film resistors sintering parameters.The 10th ICREPS was held on October 17 and 18, 2022, in Chamber of Commerce and Industry, of Serbia, Belgrade

ENCRYPTION OF 3D PLANE IN GIS USING VORONOI-DELAUNAY TRIANGULATIONS AND CATALAN NUMBERS

A method of encryption of the 3D plane in Geographic Information Systems (GIS) is presented. The method is derived using Voronoi-Delaunay triangulation and properties of Catalan numbers. The Voronoi-Delaunay incremental algorithm is presented as one of the most commonly used triangulation techniques for random point selection. In accordance with the multiple applications of Catalan numbers in solving combinatorial problems and their "bit-balanced" characteristic, the process of encrypting and decrypting the coordinates of points using the Lattice Path method (walk on the integer lattice) or LIFO model is given. The triangulation of the plane started using decimal coordinates of a set of given planar points. Afterward, the resulting decimal values of the coordinates are converted to corresponding binary records and the encryption process starts by a random selection of the Catalan key according to the LIFO model. These binary coordinates are again converted into their original decimal values, which enables the process of encrypted triangulation. The original triangulation of the plane can be generated by restarting the triangulation algorithm. Due to its exceptional efficiency in terms of launching programs on various computer architectures and operating systems, Java programming language enables an efficient implementation of our method

MULTIPLE USE OF BACKTRACKING LINE SEARCH IN UNCONSTRAINED OPTIMIZATION

The gradient method is a very efficient iterative technique for solving unconstrained optimization problems. Motivated by recent modifications of some variants of the SM method, this study proposed two methods that are globally convergent as well as computationally efficient. Each of the methods is globally convergent under the influence of a backtracking line search. Results obtained from the numerical implementation of these methods and performance profiling show that the methods are very competitive with well-known traditional methods

RuO2/Bi2Ru2O7 thick-film strain sensor with low temperature sensitivity

Structural health monitoring that gathers information about performance and conditions of civil engineering structures requires implementation of sensor networks that include strain sensing devices. This paper introduces RuO2/Bi2Ru2O7 thick-film strain sensor with low-temperature sensitivity. Under strain, RuO2/Bi2Ru2O7 thick resistive film experiences reversible deformation that can be registered as a change in film resistivity. Based on that effect, a prototype of the strain sensor is being realized and evaluated. Evaluation included measurements of the resistance change under applied strain, determination of the gage factor and investigations of and thermal stability.ISPC «Modern information and electronic technologies» : May 23-27, Odes

Implementation of anti-covid measures in university educational process taking advantage of thermal imaging approach

By returning to the classical forms of teaching and attendance of classes in the faculty facilities, appropriate anti-covid measures have been introduced. One of those measures is the regular check of the students' temperature before accessing any form of teaching in the faculty classrooms. However, serious issues soon are manifested by measuring temperature with conventional non-contact thermometers. The paper shows how some of these issues and limitations can be overcome by using thermal imaging when controlling the temperature within anti-covid measures.ISPC «Modern information and electronic technologies» : May 23-27, Odes