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Ralf Seifert

Cette personne a quitté l’EPFL

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Publications associées (57)

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Utilizing additive manufacturing and mass customization under capacity constraints

Ralf Seifert, Anna Timonina-Farkas, Rachel Agnès Laetitia Rosemonde Marie Lacroix

Additive manufacturing (AM), originally used for prototyping, is increasingly adopted for custom final part production across different industries. However, printing speed and production volume are two barriers for the adoption of AM for product customizat ...

2023

Interrelating operational and financial performance measurements in inventory control

Ralf Seifert

Financial supply chain management and working capital management are increasingly receiving attention as important avenues to increase profitability in supply chains. By actively managing payment terms and working capital requirements, managers can influen ...

2010

Product assortment and space allocation strategies to attract loyal and non-loyal customers

Ralf Seifert, Anna Timonina-Farkas, Argyro Katsifou

Assortment planning deserves much attention from practitioners and academics due to its direct impact on retailers' commercial success. In this paper we focus on the increasingly popular retail practice to use combined product assortments with both "standa ...

2020

Modeling and mitigating supply chain disruptions as a bilevel network flow problem

Ralf Seifert, Anna Timonina-Farkas, René Yves Glogg

Years of globalization, outsourcing and cost cutting have increased supply chain vulnerability calling for more effective risk mitigation strategies. In our research, we analyze supply chain disruptions in a production setting. Using a bilevel optimization ...

2022

Limiting the impact of supply chain disruptions in the face of distributional uncertainty in demand

Ralf Seifert, Anna Timonina-Farkas, René Yves Glogg

Service-level requirements play a crucial role in eliminating stock-outs in a production pipeline. However, delivering a specific service level can become an unattainable goal given the various uncertainties influencing both the production pipeline and cus ...

WILEY2022

Information Retrieval Under Network Uncertainty: Robust Internet Ranking

Ralf Seifert, Anna Timonina-Farkas

Internet ranking algorithms play a crucial role in information technologies and numerical analysis due to their efficiency in high dimensions and wide range of possible applications, including scientometrics and systemic risk in finance (SinkRank, DebtRank ...

2023

Managing Perishability in the Fruit and Vegetable Supply Chains

Ralf Seifert, Mervegül Kirci

Spoilage reduction in fresh product supply chains is an important challenge and represents great opportunities for cost savings and reduced environmental and social footprints. The purpose of this paper is to identify the drivers of spoilage and to discuss ...

2022

Interrelating Operational and Financial Performance Measurements in Inventory Control

Ralf Seifert

2008

Joint product assortment, inventory and price optimization to attract loyal and non-loyal customers

Ralf Seifert, Argyro Katsifou

In this paper, we analyze the emerging retail practice of carrying a combined product assortment consisting of both regular "standard" products and more fashionable and short-lived "special" products. The purpose of this practice is to increase store traff ...

Pergamon-Elsevier Science Ltd2014

Dynamic Product Portfolio Management with Life Cycle Considerations

Ralf Seifert, 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

Benefiting from additive manufacturing for mass customization across the product life cycle

Ralf Seifert, Anna Timonina-Farkas, Rachel Agnès Laetitia Rosemonde Marie Lacroix

Additive manufacturing (AM) was initially designed for prototyping and product personalization, where high production quantities were not required. Now, it is also implemented for final part production to achieve cost-effective mass customization (MC). Tha ...

ELSEVIER2021

Inventory Leanness and the Financial Performance of the Firm

Ralf Seifert, Olov Isaksson

This paper examines the financial consequences that inventory leanness has on firm performance. We conduct an econometric analysis using 4324 publicly traded US manufacturing companies for the period 1980-2008. Using an instrumental variable fixed effects ...

2014

Inventory dynamics in process industries: An empirical investigation

Ralf Seifert, Olov Isaksson, Philipp Urs Moser

Process industry firms have thrived in recent decades, but changes in the markets are currently putting both growth and profitability at risk. In this context, inventory management is increasingly viewed as an essential lever for creating a sustainable com ...

Elsevier2017

Financial Supply Chain Management: Working Capital Requirements with Short-term Debt

Ralf Seifert, Cristopher Ariel Zeballos Avila

In this paper, we build on a single product, finite horizon, periodic review inventory management setting and include key financial aspects such as working capital constraints, payment delays and multiple sources of financing. We numerically solve for the ...

2013

Designing Service Level Contracts for Supply Chain Coordination

Ralf Seifert

Supply contracts are used to coordinate the activities of the supply chain partners. In many industries, service level-based supply contracts are commonly used. Under such a contract, a company agrees to achieve a certain service level and to pay a financi ...

2012

Balancing Resilience and Efficiency: A Literature Review on Overcoming Supply Chain Disruptions

Ralf Seifert, Anna Timonina-Farkas

The supply chain risk management literature differentiates between disruption risk that arises from supply disruptions to normal activities and recurrent risk that arises from problems in coordinating supply and demand in the absence of disruptions. Over t ...

2024

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

Designing Service Level Contracts for Supply Chain Coordination

Ralf Seifert

Working Paper, University of Cologne, Germany2010

Item-Level RFID in the Retail Supply Chain

Ralf Seifert

Analyzing the proliferation of item-level RFID, recent studies have identified the cost sharing of the technology as a gating issue. Various qualitative studies have predicted that conflict will arise, in particular in decentralized supply chains, from the ...

2007

Managing business dynamics with adaptive supply chain portfolios

Ralf Seifert

Practitioners and scholars readily agree that firms need to frequently adapt their supply chain portfolios to respond to today's rapidly evolving business dynamics. Adapting a well established supply chain portfolio, however, may involve high costs and exp ...

2011