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Now showing items 1 - 16 of 59

  • Interview mit Dr. Heinrich Kuhn

    Kuhn, Heinrich  

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  • Configuring Retail Fulfillment Processes for Omni-Channel Customer Steering

    Wollenburg, Johannes   Holzapfel, Andreas   Huebner, Alexander   Kuhn, Heinrich  

    The fulfillment of customer orders has gained a particularly important role within omni-channel retailing, as it requires significant effort to integrate logistics networks and product flows. Offering additional fulfillment options is costly but allows the enhancement of customer services via cross-channel substitutions and faster deliveries. Retailers are asking themselves how they can leverage these integrated systems to improve return on investment as well as customer service. One option is to influence customers' channel choice (i.e., steering). Because this has so far mainly been viewed from a marketing perspective, this study investigates how and why different fulfillment options can help to steer customers across channels. By using multiple sources of data (i.e., market data, retailer interviews, customer focus groups), this paper identifies how customers can be guided through channels by means of related options in inventory management (e.g., cross-channel inventory information and substitution), delivery modes (e.g., differentiation of prices and delivery velocity across channels), and return modes (e.g., pricing for returns and options to return goods in-store). In essence, this research paper contributes a theory of cross-channel customer steering by means of different fulfillment options.
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  • Integrative retail logistics: An exploratory study

    Kuhn, Heinrich   Sternbeck, Michael G.  

    Grocery retail companies have gone through a transformational change in the past by heavily investing in distribution centers of their own and by expanding their logistics activities. As a result, many retailers are now in the process of better adjusting their logistics operations to their specific requirements against the backdrop of raising pressure in a highly competitive environment. In this light, we provide an exploratory study based on semi-structured face-to-face interviews with 28 leading European grocery retailers. First we examine the current strategic designs of grocery retailers' internal logistics networks. Next, we shift our focus to the resulting interdependencies in tactical supply chain planning between instore operations and upstream logistics processes. We have identified five interdependent planning issues: order packaging unit, store delivery pattern, store replenishment lead time, store delivery arrival times and arrival time windows, as well as roll-cage sequencing and loading carriers. Each of these mid-term planning interdependencies is evaluated with regard to implications in the stores, in transportation and in the distribution centers. The mid-term operations planning issues in the grocery retail industry considered in this paper have remained practically unexplored up to now. The outcome of this empirical research study therefore has substantial relevance for future retail research and practice.
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  • Modeling and analyzing sequence stability in flexible automotive production systems

    Lehmann, Marcel   Kuhn, Heinrich  

    We consider the question whether or not high volume automotive production sites can be transformed to the basic concept of stabilized production. The problem is motivated by the necessity of car producers to transform their existing plants to this production system in order to deal with the increasing complexity of the manufacturing process. To successfully answer this question the long term stability level needs to be determined. Since these facilities are currently working under completely different production premises the stability level is not measurable. To overcome this obstacle the estimation of possible stability levels is crucial. Therefore, we propose a discrete event based simulation model to provide the necessary information in order to answer the question formulated. To verify the proposed method, an empirical study is conducted. Besides the stability levels different influence factors and recommendations could be derived from the present study. The transparency provided by this approach fosters the understanding of the stabilized production and reveals several gaps in the literature, which provide new fields of research.
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  • Modeling and analyzing sequence stability in flexible automotive production systems

    Lehmann, Marcel   Kuhn, Heinrich  

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  • Simultaneous supply and production planning

    Kuhn, Heinrich   Liske, Thomas  

    This paper considers a novel production and logistics planning problem called the Economic Lot and Supply Scheduling Problem. The problem combines the Economic Lot-Sizing Problem and the Vehicle Routing Problem into a simultaneous problem-solving approach. The considered problem is observable in several industrial areas, e.g. in retailing and in the automotive industry. Assuming a certain delivery policy the paper presents a complete mathematical model and a epsilon-exact solution procedure. Analytical results for a broad range of test instances are calculated which demonstrate new insights into the considered planning problem. The results emphasise the economic advantage of the proposed simultaneous modeling and solution approach, especially for certain parameter settings.
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  • Simultaneous supply and production planning

    Kuhn, Heinrich   Liske, Thomas  

    This paper considers a novel production and logistics planning problem called the Economic Lot and Supply Scheduling Problem. The problem combines the Economic Lot-Sizing Problem and the Vehicle Routing Problem into a simultaneous problem-solving approach. The considered problem is observable in several industrial areas, e.g. in retailing and in the automotive industry. Assuming a certain delivery policy the paper presents a complete mathematical model and a epsilon-exact solution procedure. Analytical results for a broad range of test instances are calculated which demonstrate new insights into the considered planning problem. The results emphasise the economic advantage of the proposed simultaneous modeling and solution approach, especially for certain parameter settings.
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  • Product allocation to different types of distribution center in retail logistics networks

    Holzapfel, Andreas   Kuhn, Heinrich   Sternbeck, Michael G.  

    We consider the problem of assigning stockkeeping units to distribution centers (DCs) belonging to different DC types of a retail network, e.g., central, regional, and local DCs. The problem is motivated by the real situation of a retail company and solved by an MIP solution approach. The MIP model reflects the interdependencies between inbound transportation, outbound transportation and instore logistics as well as capital tied up in inventories and differences in picking costs between the warehouses. A novel solution approach is developed and applied to a real-life case of a leading European grocery retail chain. The application of the new approach results in cost savings of 6% of total operational costs compared to the present assignment. These savings amount to several million euros per year. In-depth analyses of the results and sensitivity analyses provide insights into the solution structure and the major related issues. (C) 2016 Elsevier B.V. All rights reserved.
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  • Capacitated lot-sizing with extensions: A review

    Quadt, Daniel   Kuhn, Heinrich  

    The capacitated lot-sizing problem (CLSP) is a standard formulation for big bucket lot-sizing problems with a discrete period segmentation and deterministic demands. We present a literature review on problems that incorporate one of the following extensions in the CLSP: back-orders, setup carry-over, sequencing, and parallel machines. We illustrate model formulations for each of the extensions and also mention the inclusion of setup times, multi-level product structures and overtime in a study. For practitioners, this overview allows to check the availability of successful solution procedures for a specific problem. For scientists, it identifies areas that are open for future research.
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  • A taxonomy of flexible flow line scheduling procedures

    Quadt, Daniel   Kuhn, Heinrich  

    We present a taxonomy for flexible flow line scheduling procedures. Flexible flow lines are flow lines with parallel machines on some or all production stages. The taxonomy groups procedures according to their general solution approach. It distinguishes optimal and heuristic procedures. Heuristic procedures are split into holistic and decomposition approaches. While holistic approaches consider the complete scheduling problem in an integrated way, decomposition approaches divide the problem with respect to the production stages, the individual jobs, or the sub-problems to be solved (batching, loading, and sequencing). We explicitly mention the inclusion of setups in a study and list the respective objective criteria. (c) 2006 Elsevier B.V. All rights reserved.
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  • Batch scheduling of jobs with identical process times on flexible flow lines

    Quadt, Daniel   Kuhn, Heinrich  

    We consider a batch scheduling problem for flexible flow lines. A number of jobs have to be scheduled, and each job belongs to a specific product type. Setup costs are incurred when changing a machine from one product type to another. On each stage, all jobs have the same process time. The objective is to minimize setup costs and the mean flow time. We identify an analogy to a pallet-loading problem and present a solution approach that consists of two nested genetic algorithms. The heuristic solves realistic problem sizes in a relatively short amount of time. It can be adjusted by a lookahead-parameter that enables a human planner to effectively manage the trade-off between the two objectives. (c) 2005 Elsevier B.V. All rights reserved.
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  • Heilpflanzen in den Tropen: Aktion Natürliche Medizin - Anamed International

    Kuhn, Heinrich   Hirt, Hans-Martin  

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  • From bricks-and-mortar to bricks-and-clicks:Logistics networks in omni-channel grocery retailing

    Wollenburg, Johannes   Hubner, Alexander   Kuhn, Heinrich   Trautrims, Alexander  

    Purpose The advent of grocery sales through online channels necessitates that bricks-and-mortar retailers redefine their logistics networks if they want to compete online. Because the general understanding of such bricks-and-clicks logistics systems for grocery is still limited, the purpose of this paper is to analyze the internal logistics networks used to serve customers across channels by means of an exploratory study with retailers from different contexts. Design/methodology/approach A total of 12 case companies from six European countries participated in this exploratory study. Face-to-face interviews with managers were the primary source for data collection. The heterogeneity of the sample enabled the authors to build a typology of logistics networks in grocery retailing on multiple channels and to understand the advantages of different warehousing, picking, internal transportation and last-mile delivery systems. Findings Bricks-and-mortar grocery retailers are leveraging their existing logistics structures to fulfill online orders. Logistics networks are mostly determined by the question of where to split case packs into customer units. In non-food logistics, channel integration is mostly seen as beneficial, but in grocery retailing, this depends heavily on product, market and retailer specifics. The data from the heterogeneous sample reveal six distinct types for cross-channel order fulfillment. Practical implications The qualitative analysis of different design options can serve as a decision support for retailers developing logistics networks to serve customers across channels. Originality/value The paper shows the internal and external factors that drive the decision-making for omni-channel (OC) logistics networks for previously store-based grocery retailers. Thereby, it makes a step toward building a contingency and configuration theory of retail networks design. It discusses in particular the differences between grocery and non-food OC retailing, last-mile delivery systems and market characteristics in the decision-making of retail networks design.
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  • Capacitated Lot-Sizing and Scheduling with Parallel Machines, Back-Orders, and Setup Carry-Over

    Quadt, Daniel   Kuhn, Heinrich  

    We address the capacitated lot-sizing and scheduling problem with setup times, setup carry-over, back-orders, and parallel machines as it appears in a semiconductor assembly facility. The problem can be formulated as an extension of the capacitated lot-sizing problem with linked lot-sizes (CLSPL). We present a mixed integer (MIP) formulation of the problem and a new solution procedure. The Solution procedure is based on a novel "aggregate model," which uses integer instead of binary variables. The model is embedded in a period-by-period heuristic and is solved to optimality or near-optimality in each iteration using standard procedures (CPLEX). A subsequent scheduling routine loads and sequences the products on the parallel machines. Six variants of the heuristic are presented and tested in an extensive computational study. (C) 2009 Wiley Periodicals, Inc. Naval Research Logistics 56: 366-384, 2009
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  • Operational patient-bed assignment problem in large hospital settings including overflow and uncertainty management

    Schäfer, Fabian   Walther, Manuel   Hübner, Alexander   Kuhn, Heinrich  

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  • An exact algorithm for solving the economic lot and supply scheduling problem using a power-of-two policy

    Kuhn, Heinrich   Liske, Thomas  

    It is not sufficient for a manufacturer of products to merely optimize lot sizes and production schedules to reduce company-wide costs. Optimal policies for raw materials purchasing, stock keeping of input material, inventory management of end products and customer demand fulfillment also have to be implemented in an integrated manner. The economic lot and supply scheduling problem (ELSSP) deals with the problem of the simultaneous planning of raw materials purchasing, production planning and storage of finished goods. The underlying assumptions of an ELSSP can be observed in several industrial areas, e.g., the retailing and automotive industries. After a brief problem description and a literature review, this paper presents a complete mathematical model and an exact procedure to solve the ELSSP using a power-of-two policy. The solution procedure is based on the junction point method. Analytical results for a broad range of test instances are calculated comparing the results of a power-of-two policy to the results from applying a common cycle policy. The results emphasize the economic advantages of the power-of-two policy especially for certain parameter values. (C) 2014 Elsevier Ltd. All rights reserved.
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