Abstract-The rapid growth of internet has created many services, which have become an integral part of our day in today life by using Web applications for making reservations, paying bills, and shopping on-line.The vulnerabilities in web application code provide an opportunity to the attack to be entre on applications level. Most network firewalls and antivirus software programs cannot stop attacks at the application level.In this paper, we have developed a prototypic web application firewall to detect new types of attacks that do not require signature updates, using a neural network back-propagation approach for identifying attacks that were not detected at the stage of signature analysis.The solution has been experimented on some parameters and some additional information about the user behaviors when the user accesses the web application and makes application-level control of the firewall in the framework of the scope of the WEB-application.The system is found to have good performance in comparing and matching the test patterns with already stored patterns and from (24) test data, (95%) success rate have been correctly recognized.Index Terms-Web applications firewall, signature, artificial neural network.

Junction temperature is an important parameter in thermal management of LEDs (Light emitting diodes) system. The junction temperature of three different types of LED is calculated numerically. Three dimension numerical simulation using ANSYS-Icepak 15 software package is presented for all cases. Appropriate heat sink is designed for each type of LED and investigates the effect of the fins height on the junction temperature. The increasing in electrical current utilized to driving the LEDs has concentrate high notice on the thermal management in the evolution of LED system. A felicitous design should have minimum thermal resistance between the heat sink base and the junction that depends on conduction heat transfer. The results showed the increase in a heat sink height 10% dissipate more heat transfer from the LEDs system at approximately 15%.

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