We consider an uncapacitated stochastic vehicle routing problem in which vehicle depot locations are fixed and client locations in a service region are unknown, but are assumed to be independent and identically distributed samples from a given probability density function. We present an algorithm for partitioning the service region into sub-regions so as to balance the workloads of all vehicles...

TO THE EDITOR: Sorkness et al. (1) show that the forced expiratory volume in 1 s (FEV1) expressed as percent predicted can be broken down into its two components, forced vital capacity (FVC) and FEV1/FVC, also expressed as percent predicted. They claim that “this is a novel approach [for partitioning the FEV1] in a quantitative manner”. In fact, this quantitative novelty was introduced 12 years...

The cell divides in a series of discrete steps that occur in a specific order. Lu and Cross (2010) now propose that cell-cycle events are ordered by a regulatory system in which a master oscillator, based on cyclin-dependent kinases, entrains a series of peripheral oscillators controlling individual events.

We prove that in theories without the tree property of the second kind (which include dependent and simple theories) forking and dividing over models are the same, and in fact over any extension base. As an application we show that dependence is equivalent to bounded forking assuming NTP2.

The aim of this work is to implement heterogeneous azeotropic distillation schemes in a dividing wall column (DWC) for a feed mixture of water (W), acetic acid (HAC) and an organic component (X). The original design makes use of X to act as an entrainer to facilitate the separation of water and HAC, and we also propose a DWC design based on this idea. This DWC design reduces the capital cost, b...

To what extent is simultaneous visual and auditory perception subject to capacity limitations and attentional control? TlIW experiments addressed this question by asking observers to recognize test tones and test letters under selective and divided attention. In Experiment I, both stimuli occurred on each trial, but subjects were cued in advance to process just one or both of the stimuli. In Ex...

This paper describes a question answering program which divides question answering into two separate processes: answer formation and answer expression. Rather than gathering possible answers and choosing the best among them, the program accesses the database and finds all components of possible answers, e.g. a causal chain, and then passes this information to an expression program which formula...

We consider the problem of dividing a geographic region into sub-regions so as to minimize the maximum workload of a collection of facilities over that region. We assume that the cost of servicing a demand point is a monomial function of the distance to its assigned facility and that demand points follow a continuous probability density. We show that, when our objective is to minimize the maxim...

We present and study a model for the nonequilibrium statistical mechanics of protein distributions in a proliferating cell population. Our model describes how the total protein variation is shaped by two processes: variation in protein production internal to the cells and variation in division and inheritance at the population level. It enables us to assess the contribution of each of these com...