Ralf Seifert

Publications associées (58)

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A test of inventory models with permissible delay in payment

Ralf Seifert, Olov Isaksson, Daniel Seifert

Contrary to the long-standing view in the finance literature that firms should maximise payment delays, research in operations management suggests that long payment delays can be suboptimal. In this study, we reconcile these two views by applying a seconda ...

2017

Building up Resilience in a Pharmaceutical Supply Chain through Inventory, Dual Sourcing and Agility Capacity

Ralf Seifert, Florian Christopher Matthias Lücker

This paper is inspired by a risk management problem faced by a leading pharmaceutical company. Key operational risk mitigation measures include Risk Mitigation Inventory (RMI), Dual Sourcing and Agility Capacity. We study the relationship between these thr ...

2017

How Process Industries Can Improve Supply Chain Performance

Ralf Seifert, Olov Isaksson, Philipp Urs Moser

2017

Dynamic Product Portfolio Management with Life Cycle Considerations

Ralf Seifert, Jean-Sébastien Tancrez, Isik Bicer

We consider a portfolio of products in which each product probabilistically transitions through various life cycle stages. The evolution through these life cycle stages is impacted by both marketing support and product launch decisions, which are bound by ...

2016

Quantifying the Bullwhip Effect Using Two-Echelon Data: A Cross-Industry Empirical Investigation

Ralf Seifert, Olov Isaksson

The bullwhip effect denotes the phenomenon whereby demand variability is amplified from a downstream site (buyer) to an upstream site (supplier) in the supply chain. This paper contributes to the literature that empirically investigates the bullwhip effect ...

Elsevier2016

Carbon footprint and responsiveness trade-offs in supply chain network design

Ralf Seifert, Jean-Sébastien Tancrez, Joana Maria Comas Marti

Concern related to sustainability and greenhouse gases has grown among citizens as well as firms, which are increasingly committing to carbon emission reduction targets. However, firms' emissions come from direct and indirect sources, and from the differen ...

2015

On the optimal frequency of multiple generation product introductions

Ralf Seifert, Shuangqing Liao

This paper considers a firm that introduces multiple generations of a product to the market at regular intervals. We assume that the firm has only a single production generation in the market at any time. To maximize the total profit within a given plannin ...

2015

Coherent Measures of Customer Service Level

Ralf Seifert, Isik Bicer

2015

Knowledge Spillovers in the Supply Chain: Evidence From The High Tech Sectors

Ralf Seifert, Olov Isaksson

2015

The value of updated information on future price behaviour

Ralf Seifert, Shuangqing Liao

This paper studies the value of information on future price behaviour. We consider a one-period inventory modelling framework with random period length and two order opportunities. The selling price is determined dynamically and the demand is price-sensiti ...

Taylor & Francis Ltd2014

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