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The purpose of this paper is to convince the reader of the usefulness of an integrated financial-operational model and simultaneously help to understand the complex relationships between operational decisions and their influence on the bottom line of the company. The problem is, that many operational models optimize operational performance measures instead of financial ones. Even when they optimize a financial objective function, merely, cost of capital, interest or taxes are not taken into account. That is why we build an integrated model that takes into account the cost of all capital. [ABSTRACT FROM AUTHOR]

In this paper, we considera queueing model of computer network under DoS attacks. The arrival of SYN packets contains two types: the regular request packets and the attack packets that request for connections. We assume that the connection requests arrive according to a Poisson processes and the service times are general but different for the two types of requests. A maximum number of connections can be served at the same time. Each half-open connection is held for at most a deterministic or random period of time (timeout). We obtain the steady-state probability distribution of the stochastic process describing the evolution of such a system. Next, we show how to compute some security metrics such as the loss-probability or the buffer occupancy percentage of half-open connections for attack packets. [ABSTRACT FROM AUTHOR]