Di ver sos ti pos de po li es ti re no mo di fi ca dos fo ram ob ti dos atra vés da po li me ri za ção por en xer tia (graft poly me ri za ti on) de es ti re no na pre sen ça dos se guin tes mo di fi ca do res: co po lí me ro de eti le no-acetato de vi ni la (EVA); po li e ti le no de ba i xa den si da de (PE) e po li bu ta di e no (PB). Os mo di fi ca do res fo ram uti li za dos em se pa ra do...

The Denial of service (DoS) and Distributed Denial of Service (DDoS) attacks are aimed at maliciously consuming the available resources in computing systems to prevent genuine users from legitimately accessing them. These attacks can easily interrupt or disable targeted systems, so it is important for the system to detect and filter bogus connection requests as early as possible. Many common pr...

VANET (Vehicular Ad-hoc Network) which is a hy- brid network (combination of infrastructure and infra- structure-less networks) is an emergent technology with promising future as well as great challenges especially in security. By the other hand this type of network is very sensible to safety problem. This paper focuses on a new mechanism for DoS (denial of service) attacks on the physical and ...

the density of state and the natural bond orbital calculations were carried out to study theoxidation of co on au14 nano cluster through two different mechanisms and determining the bestmechanism for the reaction. chemisorption of o2 and co on the nano cluster led to change in energy,density of state and its thermodynamic properties. we calculated the energy band gap between thehighest occupied...

DoS attack tools have become increasingly sophisticated challenging the existing detection systems to continually improve their performances. In this paper we present a victimend DoS detection method based on Artificial Neural Networks (ANN). In the proposed method a Feed-forward Neural Network (FNN) is optimized to accurately detect DoS attack with minimum resources usage. The proposed method ...

Received: 06/25/2007 Approved: 12/18/2007 Portugu se / English: www.scielo.br/reeusp RESUMO Este é um estudo exploratório de natureza quantitativa e qualitativa, que avalia o desempenho dos serviços de saúde na execução do DOT no domicílio em um município de grande porte. Para a análise quantitativa foram construídos indicadores que avaliaram a otimização dos recursos materiais/ humanos e a efe...

The vibrational density of states (DoS), calculated from the Fourier transform of the velocity autocorrelation function, provides profound information regarding the structure and dynamic behavior of a system. However, it is often difficult to identify the exact vibrational mode associated with a specific frequency if the DoS is determined based on velocities in Cartesian coordinates. Here, the ...

The pleckstrin homology (PH) domain-containing protein Daughter of Sevenless (DOS) is an essential component of the Sevenless receptor tyrosine kinase (SEV) signaling cascade, which specifies R7 photoreceptor development in the Drosophila eye. Previous results have suggested that DOS becomes tyrosine phosphorylated during SEV signaling and collaborates with the protein tyrosine phosphatase CSW....

Maintaining genomic integrity during DNA replication is essential for stem cells. DNA replication origins are licensed by the MCM2-7 complexes, with most of them remaining dormant. Dormant origins (DOs) rescue replication fork stalling in S phase and ensure genome integrity. However, it is not known whether DOs exist and play important roles in any stem cell type. Here, we show that embryonic s...

O objetivo princzpal deste artigo e" fer com que todos, sejam os acade^micos ou Os empresa rios ou aLnda os consumz.dores, compreendam o cena"rz-o atual e possam ter, pelo menos, uma percep50 minx'ma dos rumos qu_e as empresas, as tecnoLogz"as e o mercado consumidor tonzara-o nos pr6xz"mos anos. Para aLcanor o obj~etino deste artigo, mostra-Se o resultado de um estudo onde e" avaliado como as e...