Publications

We investigate how volume exibility, de ned by a sourcing cost premium beyond a base capacity, at a local responsive supplier impacts the decision to reshore supply. The buyer also has access to a remote supplier that is cheaper with no restrictions on volume exibility. We show that with unit lead time difference between both suppliers, the optimal dual sourcing policy is a modi ed dual base-stock policy with three base-stock levels Sf2 , Sf1 , ...

After decades of offshoring production across the world, companies are rethinking their global networks. Local sourcing is receiving more attention, but it remains challenging to balance the offshore sourcing cost advantage against the increased inventories, because of its longer lead time, and against the cost and (volume) flexibility of each source’s capacity. To guide strategic allocation in this global network decision, this paper ...

Synchromodality, also referred to as "synchronized intermodality", employs multiple transport modes in a flexible, dynamic way in order to induce a modal shift towards more environmentally friendly transport modes like rail or inland waterways, without compromising on responsiveness and quality of service. It is characterized by the synchronized parallel usage of different transport modes and/or the ability to switch freely between ...

We investigate near-shoring a small part of the global production to local SpeedFactories that serve only the variable demand. The short lead time of the responsive SpeedFactory reduces the risk of making large volumes in advance, yet it does not involve a complete re-shoring of demand. Using a break-even analysis we investigate the lead time, demand, and cost characteristics that make dual sourcing with a SpeedFactory desirable compared to ...

Single-phase, utility interfaced, isolated AC-DC converters with power f actor correction cover a wide range of applications such as chargers for plug-in hybrid electric vehicles and battery electric vehicles, inverte rs for multiple renewable energy sources (e.g. photovoltaic modules), as well as interfaces for residential DC distribution systems and energy s torage systems. Thereby, bidirectional conversion capability enables the development ...

The Fellman and Jakobsson theorem of 1976 deals with transformations phi of the rank-frequency function g and with their Lorenz curves L (phi degrees g) and L(g). It states (briefly) that L (phi degrees g) is monotonous (in terms of the Lorenz dominance order) with phi(chi)/chi. In this paper we present a new, elementary proof of this important result. The main part of the paper is devoted to the dual transformation g degrees psi(-1), where psi ...

In [J.L. Kim, K. Mellinger, L. Storme, Small weight codewords in LDPC codes defined by (dual) classical generalised quadrangles, Des. Codes Cryptogr. 42 (1) (2007) 73-92], the codewords of small weight in the dual code of the code of points and lines of View the MathML source are characterised. Inspired by this result, using geometrical arguments, we characterise the codewords of small weight in the dual code of the code of points and generators ...