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Retransmission-based broadcasting scheme is one of ways for enhancing broadcast reliability. This paper deals with the issue about how much we can improve the broadcast reliability for the deadline-constrained one-hop broadcasting based on the slotted-Aloha with retransmission. The successful delivery probability (SDP) is derived and then the optimal access probability maximizing the SDP is provided...
We need to consider not only service quality but also the purchase and maintenance cost when setting the RAMS requirements for rolling stock. This article suggests one indicator to evaluate the effectiveness of the RAMS requirements which is LCC (life cycle cost). A new LCC model is suggested which is based on LCC elements affected by RAMS requirements. Acquisition cost, maintenance cost and hazard...
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