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Abstract-Software design patterns provide a proven and comprehensive solution for a series of problems that designers confront with them. Web security becomes a critical issue in the online environments. Many techniques strive to achieve web applications to acceptable level of confidence. One of the useful behavioral design patterns is the chain-of-responsibilities pattern that includes several command objects in a series of processing objects. There is a set of logic in each processing object that can handle a command and transfer it to the next processing object. This series of processing objects is stable, and also, the position of each ring in the chain is unchangeable. In this paper, a dynamic chain of responsibilities design pattern that provides a new mechanism for enhance flexibility in security of web application would be presented.

Social network is a term used to represent a large group of activities using the web and mobile technologies. The micro blogging social networks provide an appropriate ground for the users to explain themselves and express their ideas as well as interacting with the others. The growth of the social networks' users creates the necessity of extracting and analyzing the contents of the users' notes and multimedia products. In this paper, a new methodology is defined to characterize users based on the contents of their posts in micro blogging social networks and also to create clusters of users by means of highlighting the distribution of words representing a topic in the contents of micro blogging social networks.

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