The SIP is becoming the core of multimedia communication network through the IP, based on which the 3G network has been operated in our country. The easy implementation, high destruction and hard tracking against attacking source which are the characters of DoS attack cause the great security threat to SIP. Focusing on the research on defense mechanisms of DoS attacks in SIP protocol, this pape...

We propose a novel service architecture to provide DoS resistant communication services in the Internet. The architecture consists of a large scale federated overlay network with DoS protected tunnels established between overlay nodes. Individual overlay nodes are deployed and maintained by the domains hosting them. The overlay network as a whole is shared by all participating domains. This arc...

A mineração temporal de textos (temporal text mining TTM) é uma técnica cujo objetivo é descobrir a estrutura latente e padrões temporais em coleções de texto. Estas características são importantes em coleções em que os tópicos de interesse mudam frequentemente com o passar do tempo. Além disso, a mineração temporal de textos é útil em ferramentas de sumarização e descoberta de tendências. Nest...

O fracionamento cromatográfico dos extratos orgânicos das folhas e galhos de Luxemburgia nobilis (Ochnaceae) forneceu o sitosterol, sitosterol-3-O-βD-glicopiranosil, friedelina, friedelinol, a mistura dos triterpenos lupeol, α-amirina e β-amirina, rutina, epicatequina, uma mistura de duas chalconas, isoliquiritigenina e 3’-hidróxiisoliquiritigenina, duas biflavonas conhecidas, amentoflavona e r...

We investigate the density of states (DOS) for hole transport in undoped and doped amorphous organic films using high lateral resolution Kelvin probe force microscopy. Measurements are done on field effect transistors made of N,N1-diphenyl-N, N1-bis(1-naphthyl)-1,10-biphenyl-4,4II-diamine undoped or p doped with tetrafluoro-tetracyanoquinodimethane. We determine the DOS structure of the undoped...

Wireless sensor networks (WSNs) are a special type of Ad-hoc network. WSNs are easily subjected to intentional or unintentional attacks as compared to wired based networks. Denial of Service (DoS) attack is one of the main threats that the network is facing. DoS attack makes use of many hosts to send a lot of useless packets to the target in short time of invalid access which will consume the t...

Denial of Service(DoS) attacks pose a big threat to any electronic society. DoS and DDoS attacks are catastrophic particularly when applied to highly sensitive targets like Critical Information Infrastructure. While research literature has focussed on using various fundamental classifier models for detecting attacks, the common trend observed in literature is to classify DoS attacks into the br...

JUSTIFICATIVA E OBJETIVOS: Desde tempos imemoriais, o ópio e os seus derivados, além de exercerem ponderável influência sobre o comportamento dos seres humanos, têm sido empregados como sedativo e como analgésico. A partir do século XIX, com o isolamento dos alcalóides do ópio e as facilidades para o emprego dessas substâncias por via parenteral, houve aumento do interesse pelo uso criterioso d...

A highly sensitive microarray system for detecting protein-protein interactions has been developed. This method was successfully applied to analyze the interactions of heme-regulated phosphodiesterase from Escherichia coli (Ec DOS). To immobilize (His)6-Tag fused Ec DOS, anti-(His)6-Tag monoclonal antibody (anti-(His)6-Tag mAb) was initially immobilized on the solid surface, and (His)6-Tag fuse...

In this paper, we simulated Collusion and Network partition DoS attacks using GlomoSIm (GLobal MObile information system SIMulator). The network with 36 nodes in grid pattern was chosen. Throughput analysis with and without DoS attack was carried out for varying number of nodes. The importance of fairness in MAC layer is also justified through the results obtained. Keywords— DoS, Collusion, Par...