Subotica, Serbia
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Cisar P.,Academy of Criminalistic and Police Studies | Cisar S.M.,Subotica Technology
CINTI 2016 - 17th IEEE International Symposium on Computational Intelligence and Informatics: Proceedings | Year: 2016

This paper describes the basic concepts of a relatively new security approach - Runtime Application Self-Protection Technology (RASP), whose wider implementation is expected in the near future. The current focus of this technology is on the vulnerabilities of Java and.NET platforms. In addition to typification, the paper presents the advantages and disadvantages of RASP. Despite the undoubted advantages, it is not an independent and comprehensive solution to ensure the security of the software. In combination with the tried and tested conventional methods, RASP provides an efficient way to prevent malicious activities. © 2016 IEEE.

Kecskes I.,Óbuda University | Odry P.,Subotica Technology
ICCC 2013 - IEEE 9th International Conference on Computational Cybernetics, Proceedings | Year: 2013

The current research is part of the building of a dynamic model for Szabad(ka)-II hexapod walking robot. The fixed-step solver type was used within the Simulink environment and the inverse dynamics was calculated using the Robotics Toolbox. The model based on rigid-body dynamics should comprise a sponge-coated foot. A simple approximate spring-damper model was implemented for the modeling of ground-foot contact which causes the fastest transient dynamic event. The calculation errors were measured and obtained at the deflection of the spring-damper in order to define the adequate accuracy. The aim was to find the optimal sampling when the calculation errors are negligible but without the use of unnecessary and too many calculations. This paper establishes three simple definitions for the estimation of the adequate fixed-step size. © 2013 IEEE.

Kecskes I.,Applied DSP | Odry P.,Subotica Technology
LINDI 2012 - 4th IEEE International Symposium on Logistics and Industrial Informatics, Proceedings | Year: 2012

The dynamic model calculates the forces and electric activities that appear during the movement of the robot. The article [1] demonstrates a full kinematic model of a four-wheeled robot car which we have expanded with a minimal dynamic model in this work. Fuzzy route control was applied, because it was more customizable than the simple PID control. In the foreseen task, the robot must reach a target point by some predefined specific requirements. We performed a comparison between the P route controller solution in article [2] and our Fuzzy controller for a case. Fuzzy logic, one of the most suitable soft computing methods which can represent the knowledge base of the routing requirement [3]. We developed fitness function evaluation of driving, for which the kinematic and dynamic characteristics are required. © 2012 IEEE.

Attila R.,Subotica Technology | Stampfer M.,Unuversity of Pecs | Imre S.,Budapest University of Technology and Economics
Procedia CIRP | Year: 2013

By automating the tasks of the fixture design and configuration we can save considerable time, and spare the process engineer from a tiresome work. In this paper a system is introduced that gives us recommendations on the number and the order of the needed setups, and proposals on the appropriate fixtures needed at machining a given workpiece. The input data are the CAD model of the workpiece saved in IGES format, and the technological requirements. The output data are the CAD models of the needed fixtures. © 2013 The Authors.

Simon J.,Subotica Technology | Martinovic G.,Josip Juraj Strossmayer University of Osijek
Acta Polytechnica Hungarica | Year: 2013

In the current work we present an algorithmic proposal for mobile robot navigation using a Wireless Sensor Network (WSN) for the location of a mobile measuring station in a controlled microclimatic environment. Another point of consideration is determining the navigation strategy. Publications in this field of robotics offer a large number of localization methods, mainly focusing on two fields: navigating locally and globally. Navigating locally will determine the mobile robot's position and orientation by implementing a series of sensors. Once we start from an initial position, the robot's position and orientation are updated continuously through the given time frame. Global navigation will ensure that the robot is able to determine its own position and orientation without having previously studied a map or being given some specific information.

Retfalvi A.,Subotica Technology
Acta Polytechnica Hungarica | Year: 2015

Modular fixtures are usually built from standard elements that can be found in the modular element set of a certain manufacturer. But in some cases the user besides using these elements modifies some semi-finished elements that can also be found in the modular element set, or even the user produces some brand new elements. The motivation behind this can be to simplify the fixture, or to make the locating or clamping of a workpiece possible or more precise. This paper presents the methods of automatic generation, and if required, automatic modification of such new or semi-finished elements. © 2015, Budapest Tech Polytechnical Institution. All Rights Reserved.

Miklos P.,Subotica Technology
SISY 2011 - 9th International Symposium on Intelligent Systems and Informatics, Proceedings | Year: 2011

Discrete tomography is concerned with reconstructing images from projections. In this paper the binary image is reconstructed from only two projections. A new reconstruction method of binary images is shown that is based on tabu search and the classic Ryser algorithm. The binary image is first reconstructed with the classic Ryser algorithm, and after that smart switching and constraint satisfaction is used to reconstruct a desired matrix. © 2011 IEEE.

Gogolak L.,Subotica Technology | Pletl S.,University of Szeged | Kukolj D.,University of Novi Sad
SISY 2011 - 9th International Symposium on Intelligent Systems and Informatics, Proceedings | Year: 2011

The indoor localization is an actual problem because there are more and more application areas. New technical solutions are available, which have contributed to the indoor localization researches. In this work Fingerprint (FP) localization methodology applied in the experimental indoor environment is presented. The Wireless Sensor Network technology (WSN) is used in real environment, which provided the necessary measurement results to the FP localization. For the processing Received Signal Strength Indicator (RSSI) and for determining the position the neural network model is used. The RSSI values used for the learning of the neural network are preprocessed (mean, median, standard deviation) in order to increase the accuracy of the system. The type of the neural network is a feed-forward network. During obtain learning different algorithms were applied. The mean square error of Euclidean distance between calculated and real coordinates and the histogram of precision were used to determine the accuracy of the neural network. © 2011 IEEE.

Retfalvi A.,Subotica Technology
International Review of Aerospace Engineering | Year: 2015

The clamping of a workpiece against the cutting forces can often be solved in several different ways. The difference lies in the size, number and location of the clamping elements and their adapter elements. If a workpiece contains such openings, that form a through hole, often it can be used at the clamping of the workpiece. Such a clamping solution can result in fixture size reduction compared to those solutions where this possibility is neglected. Apart from this, the use of this clamping method increases the number of the surfaces that can be machined in the same setup, and this way sometimes the number of the needed setups can be reduced. In this article a fixture planning and design system is introduced that, among other methods, takes into consideration this kind of clamping, too. Those conditions are presented in the papers which are investigated by the system, while weighting the possibility of the clamping of a workpiece over a through hole. © 2015 Praise Worthy Prize S.r.l. -All rights reserved.

Miklos P.,Subotica Technology
SISY 2014 - IEEE 12th International Symposium on Intelligent Systems and Informatics, Proceedings | Year: 2014

In this paper binary matrices are reconstructed from two orthogonal projections. In the reconstruction process particle swarm optimization is used. Since most of the reconstruction problems are NP-hard, the use of a global optimization process gave promising results. The task is to adjust the particle swarm algorithm to the problem of the reconstruction of binary matrices. The main focus is on the reconstruction of hv-convex matrices which consist of either one or more connected components. At the end of the paper the results are shown and the appropriate conclusions are drawn. © 2014 IEEE.

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