We study simultaneous ascending auctions of identical objects when bidders are financially constrained and their valuations exhibit complementarities. We assume the budget constraints are known but the values for individual objects are private information, and characterize noncollusive equilibria. The equilibria exhibit the exposure problem. The bidder with the highest budget is more reluctant ...

This paper studies combinatorial auctions with budget-constrained bidders from a mechanism design perspective. I search for mechanisms that are incentive compatible, individually rational, symmetric, nonwasteful and non-bossy. First focusing on the greedy domain, in which any increase in a bidder’s valuation always exceeds his budget, I derive the unique mechanism, called the Iterative Second P...

Activity rules have emerged in recent years as an important aspect of practical auction design. The role of an activity rule in an iterative auction is to suppress strategic behavior by bidders and promote simple, continual, meaningful bidding and thus, price discovery. These rules find application in the design of iterative combinatorial auctions for real world scenarios, for example in spectr...

To gain insight into the potential logistical beneets of worker cross-training and agile workforce policies, we study simple models of exible workers in serial production systems. The primary control issue is how to assign workers to jobs/stations over time. Under assumptions of complete worker exibility and collaborative work, we prove that a simple expedite policy minimizes along each sample ...

The optic ow eld is deened as preserving the intensity along ow-lines. Due to singularities in the image at xed time, poles are created in the optic ow eld. In this paper we describe the generic types of ow singularities and their generic interaction over time. In a general analytic ow eld, normally the topology is characterised by the points where the ow vanish again subdivided into repellers,...

This paper proposes a model for studying the computation of xpoints that arise in complex program analysis based on abstract interpretation, and presents an e cient algorithm for computing xpoints based on the model. Abstract interpretation provides a uni ed framework for handling interprocedural analysis of programs with unrestricted pointer manipulation, higher-order functions, and continuati...

Background Outdoor work is associated with high and chronic exposure to solar ultraviolet radiation which might lead an increased risk of developing skin (pre)malignancies. Prevalence actinic keratosis (AK), basal cell carcinoma (BCC), cutaneous squamous (cSCC) melanoma (cM) in Dutch outdoor workers (OW) has not previously been investigated. Objective This study compares the prevalence premalig...