Korišćenje interneta i rizici po seksualni integritet maloletnika – eksperiment "Krstarica"

U radu su u formi prethodnog saopštenja prikazan rezultati svojevrsnog virtuelnog eksperimenta, zasnovanog na realnim događanjima koji su usledili nakon fiktivnog predstavljanja na serveru za ćaskanje ’’Krstarica’’. Radi se o serveru koji tekstualnu komunikaciju korisnika obavlja putem IRC (Internet RelayChatting) protokola. U svrhe ovog istraživanja kreiran je virtuelni lik maloletne Beograđanke, čiji je nadimak sugerisao starost od 12 godina (Ana12BG). Posredstvom IRC-a, preko pomenutog servera, virtuelna Ana posećivala je sobe #teen, #krstarica i #beograd i čekala uspostavljanje komunikacije od strane drugih korisnika, među njima i potencijalnih pedofila. Tokom 100 časova provedenih na mreži usledilo je 617 poziva za komunikaciju, među kojima je preko 70% bilo seksualno orjentisanih. Značajan broj ovih korisnika nudilo je Ani pornografski materijal (24%) ili tražilo njene eksplicitne pornografske sadržaje (14%). Ovi podaci, kao i drugi izneti u radu, sugerišu da je internet medij koji koristi velik broj lica čije seksualne sklonosti idu u pravcu zadovoljavanja u kontaktu sa decom. Prema ovom istraživanju, većinu njih, pored maloletnika,čine lica starija od 40 godina

Primena algoritama upravljanja baziranih na fuzzy logici u upravljanju robotom sa tri stepena slobode

U narednom izlaganju prikazano je modeliranje robota reperzentovanog kinematskim lancem sa n-stepeni slobode prilikom cega je matematicki model unapredjen uzimanjem u obzir elasticnosti u zglobovima.Takodje pokazano je upravljanje robotom primenom fuzzy logic-a kao i MATLAB simulacija upravljanog sistema

Fuzzy logic control of robot with three degrees of freedom: further results

In the control system designing process, it is very difficult to determine exact mathematical model of the controlled object . It is necessary to make some assumptions in order to avoid model to become „academic“. These assumptions bring error to mathematical model which is often known as 'modelling error'. Fuzzy logic provides elemination of these problem, since it doesn't need exact model for forming controller. It only needs input and output variables, along with their dependance. In this paper is presented forming of the controlling system for robot with 3DOF, and dependance of variation of number and shape of fuzzy membership functions on quality of control

Modeling and Analysis of suspension system of a horizontal axis washing machine

In this paper, we present the multi-body dynamic model of a horizontal-axis washing machine and its validation. It will be described alternative approach for modeling and simulation of washing machines as rigid multibody systems (MBS). In that way, one may achieve more efficient and simplified approach for automatic setting of differential equations for motion as well as more suitable for parametric simulation. Moreover, the proposed model will be used to design and test new solutions to improve the dynamical response and to reduce vibrations of washing machine. In order to prove it, we have demonstrated it on washing machine as planar rigid MBS within the Symbolic Toolbox of MATLAB environment

Korišćenje interneta i rizici po seksualni integritet maloletnika – eksperiment "Krstarica"

U radu su u formi prethodnog saopštenja prikazan rezultati svojevrsnog virtuelnog eksperimenta, zasnovanog na realnim događanjima koji su usledili nakon fiktivnog predstavljanja na serveru za ćaskanje ’’Krstarica’’. Radi se o serveru koji tekstualnu komunikaciju korisnika obavlja putem IRC (Internet RelayChatting) protokola. U svrhe ovog istraživanja kreiran je virtuelni lik maloletne Beograđanke, čiji je nadimak sugerisao starost od 12 godina (Ana12BG). Posredstvom IRC-a, preko pomenutog servera, virtuelna Ana posećivala je sobe #teen, #krstarica i #beograd i čekala uspostavljanje komunikacije od strane drugih korisnika, među njima i potencijalnih pedofila. Tokom 100 časova provedenih na mreži usledilo je 617 poziva za komunikaciju, među kojima je preko 70% bilo seksualno orjentisanih. Značajan broj ovih korisnika nudilo je Ani pornografski materijal (24%) ili tražilo njene eksplicitne pornografske sadržaje (14%). Ovi podaci, kao i drugi izneti u radu, sugerišu da je internet medij koji koristi velik broj lica čije seksualne sklonosti idu u pravcu zadovoljavanja u kontaktu sa decom. Prema ovom istraživanju, većinu njih, pored maloletnika,čine lica starija od 40 godina

Biologically inspired modeling and control of robotic systems

In this paper, it is proposed using synergy, where a new kind of biologically inspired control of redundant actuator robotic system is obtained as invariant on control variables - “control synergy“.Also, model of bio-mechanical system may be obtained using another biological concept called distributed positioning which is based on the inertial properties and actuation of joints of considered mechanical system

Biologically inspired modeling and control of robotic systems

In this paper, it is proposed using synergy, where a new kind of biologically inspired control of redundant actuator robotic system is obtained as invariant on control variables - “control synergy“.Also, model of bio-mechanical system may be obtained using another biological concept called distributed positioning which is based on the inertial properties and actuation of joints of considered mechanical system

Automatsko formiranje i simulacija diferencijalnih jednačina kretanja sistema krutih tela primenom Symbolic toolbox-Matlab-a

U ovom radu prikazan je postupak formiranja i simulacije diferencijalnih jednačina kretanja robota sa tri stepena slobode i veš mašine kao sistema krutih tel sa četiri stepena slobode 2D model. To je realizovano korišćenjem Simboličkog Toolboxa i Simulinka u MATLAB okruženj

Biologically inspired optimal control of robotic system:synergy approach

This paper suggests a new optimal control of robotic system based on a biologically inspired control principle-synergy, which allows resolving actuator redundancy. The redundancy control problem has been discussed in the framework of optimal control problem which is solved by Pontryagin's maximum principle. Joint actuator synergy approach is suggested which is established by optimization law at coordination level, where is introduced a central control as suggested Bernstein in [1]. In that way, one may obtain a specific constraint(s) on the control variables. Finally, the effectiveness of suggested biologically inspired optimal control is demonstrated with a suitable robot with three degrees of freedom and four control variables as the illustrative example