To offset sedentary lifestyles, physical activity is widely promoted in the workplace. In this paper, we present HealthQuest, a mixed reality system to motivate employees’ physical activity. HealthQuest leverages a company facility’s existing physical infrastructure augmented with distributed kiosks. Users engage in wellness learning quests by walking from kiosk to kiosk in the environment. The...

We show that deciding if a mixed graph has a well-balanced orientation is NP -complete.

The paper deals with the competitive effects of price guarantees in a spatial duopoly where consumers can search for lower prices but have to incur hassle costs if they want to claim a price guarantee. It is shown that symmetric equilibria with and without price guarantees exist but price guarantees will have no effect on prices if search costs are low, hassle costs are high and the number of u...

The purpose of the research presented in this paper has been to characterize flexibility in lean mixed model assembly lines through exploring mechanisms used to achieve flexibility. The study combines a literature review and a multiple case study in two manufacturing companies. Scenarios of volume, mix and operation flexibility, as well as flexibility to introduce or remove products were studie...

We describe the form of the linear mixed-effects and generalized linear mixed-effects models fit by lmer and give details of the representation and the computational techniques used to fit such models. These techniques are illustrated on several examples.

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