I study a network based mechanism of norm enforcement in a community where agents play a Prisoner’s Dilemma with changing partners. Agents may choose a number of close friends. Communication to close friends within the network enforces cooperation. In a world with noiseless communication, it is optimal that each agent has close contacts to all other network members. Moreover, it is optimal to h...

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women's strong will to obtain higher education degrees and to work as faculty member of universities is an undeniable fact in iranian current society. nevertheless, female faculty members just like many other women encounter some career problems which can affect their emotions, attitudes and behaviors. this article aims at answering the three following questions: - what are the career prob...

We present and analyze a new algorithm for establishing shared cryptographic keys in large, dynamically changing groups. Our algorithm is based on a novel application of one-way function trees. In comparison with previously published methods, our algorithm achieves a new minimum in the number of bits that need to be broadcast to members in order to re-key after a member is added or evicted. The...