We consider a variation of Design Theory, in which the elements of the base set may be “available” or not. The random variable of interest is the number of subsets in the design which contain some available element. We are particularly interested in the variance of this variable, and we look for arrangements which minimize this value. We provide the solution to some instances of this problem; w...

We examine the limits of consistency in highly available and fault-tolerant distributed storage systems. We introduce a new property—convergence—to explore the these limits in a useful manner. Like consistency and availability, convergence formalizes a fundamental requirement of a storage system: writes by one correct node must eventually become observable to other connected correct nodes. Usin...

Of the three common objectives of information seurity availability is far less understood than con dentiality and integrity of information As threats against availability are too numerous to be identi ed a di ernt approach is required for the protection In this paper a layered protection of availability shall be established and the cost of protection shall be justi ed at each layer A very large...

In scheduling literature, the notion of machine non-availability periods is well known, for instance for maintenance. In our case of planning chemical experiments, we have special periods (the week-ends, holidays, vacations) where the chemists are not available. However, human intervention by the chemists is required to handle the starting and termination of the experiments. This gives rise to ...

This review updates and complements the review of energy balance and body composition in the Proceedings of the 2003 IOC Consensus Conference on Sports Nutrition. It argues that the concept of energy availability is more useful than the concept of energy balance for managing the diets of athletes. It then summarizes recent reports of the existence, aetiologies, and clinical consequences of low ...

Iron has been extracted from 25 common foods under conditions resembling those prevailing in the stomach under physiological conditions. In most cases less than half the iron in the foods is released into solution. The soluble iron is mainly in ionizable form, except in the case of meat products and black pudding. The amount of food iron released is influenced by cooking and the presence of iro...

Improvements in aircraft availability allow better assignment of aircrafts to specific missions. Aircraft Availability is important to reach the organisational goals like ‘air power’ and mission availability. The performance indicator Aircraft Availability gives insight of the contribution to the mission capability of the fleet. Depending on the goal, there are different ways to calculate Aircr...

Mobile IPv4 specifies a protocol in order to enhance transparent routing of IP datagrams. The main objective of this protocol is to ensure an ability to communicate in a mobile environment where a node can change its place. An essential part of this protocol is a Home Agent, a router on the Mobile Nodes home network, which has a responsibility to tunnel datagrams to the node. In order to locate...