Wireless sensor networks are now used in various fields. The information transmitted in the wireless sensor networks is very sensitive, so the security issue is very important. DOS (denial of service) attacks are a fundamental threat to the functioning of wireless sensor networks. This paper describes some of the most common DOS attacks and potential methods of protection against them. The case study shows one of the most frequent attacks on wireless sensor networks -the interference attack. In the introduction of this paper authors assume that the attack interference can cause significant obstruction of wireless sensor networks. This assumption has been proved in the case study through simulation scenario and simulation results. RESUMENLas redes de sensores inalámbricos se utilizan ahora en varios campos. La información transmitida en las redes de sensores inalámbricos es muy delicada, por lo que el tema de la seguridad es muy importante. Los ataques de DOS (Denegación de servicio) son una amenaza fundamental para el funcionamiento de las redes de sensores inalámbricos. Este documento describe algunos de los ataques DOS más comunes y los posibles métodos de protección contra ellos. El estudio de caso muestra uno de los ataques más frecuentes a las redes de sensores inalámbricos: el ataque de interferencia. En la introducción de este artículo, los autores suponen que la interferencia de ataque puede causar una obstrucción significativa de las redes de sensores inalámbricos. Esta suposición se ha demostrado en el estudio de caso a través de escenarios de simulación y los resultados de estas simulaciones.Palabras clave: Redes de sensores inalámbricos, detección de intrusión, comunicación inalámbrica, seguridad del sistema de comunicación, interferencia de radiofrecuencia.
This paper describes a digital frequency multiplier for a pulse rate. The multiplier is based on the recursive processing of the input and output periods and their time differences. Special emphasis is devoted to the techniques which provide the development of multipliers based on this principle. The circuit is defined by two system parameters. One is the ratio of two clock frequencies and the other is a division factor of a binary counter. The realization of the circuit is described. The region of the system parameters for the stable circuit is presented. The different aspects of applications and limitations in realization of the circuit are considered. All mathematical analyses are made using a Z transform approach. It is shown that the circuit can be also used in tracking and prediction applications. Computer simulations are performed to prove the correctness of the math and the whole approach.
Razvojem Interneta transportne organizacije imaju bolje mogućnosti za povećanje učešća na konkuretnom tržištu usluga. Povećanjem udela povećava se i broj zadovoljnih korisnika usluge i naravno, transportne organizacije ostvaruju veću finansijsku dobit. Multimedije mogu da imaju široku primenu u svakoj organizaciji. Multimedija je specifična, a krase je četiri osnovne karakteristike: interaktivna je, personalna je, digitalna je i potrebno je korišćenje računara. Na osnovu navedenog potrebno je definisati strategiju koja kroz multimediju ima osnovni zadatak da zadovolji očekivanja korisnika usluga preko Interneta i multimedijalnih komunikacija. Korišćenje veb sajta ima široku primenu, a pri tome postoje različiti stepeni upotrebljivosti. Cilj rada je da pokaže kako korisničko iskustvo može da bude moćan alat za vrednovanje i poboljšanje dizajna sajta nove transportne organizacije. Na praktičnom primeru izvršiće se testiranje korisnika usluge na železničkoj stanici, gde će detaljno biti obrađeni, korak po korak: prikupljanje, analiziranje i predstavljanje pokazatelja korisničkog iskustva. Na osnovu dobijenih pokazatelja korisničkog iskustva mogu se predložiti mere koje utiču direktno na sajt nove transportne organizacije.
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