http://hdl.handle.net/10993/64 Search this channel search http://orbilu.uni.lu/simple-search http://hdl.handle.net/10993/41540 Title: Forecasting spare part demand using service maintenance information <br/> <br/>Author, co-author: van der Auweraer, Sarah; Boute, Robert <br/> <br/>Abstract: We focus on the inventory management of critical spare parts that are used for service maintenance. These parts are commonly characterised by a large variety, an intermittent demand pattern and oftentimes a high shortage cost. Specialized service parts models focus on improving the availability of parts whilst limiting the investment in inventories. We develop a method to forecast the demand of these spare parts by linking it to the service maintenance policy. The demand of these parts originates from the maintenance activities that require their use, and is thus related to the number of machines in the field that make use of this part (known as the active installed base), in combination with the part's failure behaviour and the maintenance plan. We use this information to predict future demand. By tracking the active installed base and estimating the part failure behaviour, we provide a forecast of the distribution of the future spare parts demand during the upcoming lead time. This forecast is in turn used to manage inventories using a base-stock policy. Through a simulation experiment, we show that our method has the potential to improve the inventory-service trade-off, i.e., it can achieve a certain cycle service level with lower inventory levels compared to the traditional forecasting techniques for intermittent spare part demand. The magnitude of the improvement increases for spare parts that have a large installed base and for parts with longer replenishment lead times. http://hdl.handle.net/10993/41536 Title: Forecasting spare part demand with installed base information: A review <br/> <br/>Author, co-author: van der Auweraer, Sarah; Boute, Robert; Syntetos, Aris http://hdl.handle.net/10993/41080 Title: Methods for mitigating disruptions in complex supply chain structures: a systematic literature review <br/> <br/>Author, co-author: Bier, Tobias; Lange, Anne; Glock, Christoph http://hdl.handle.net/10993/39913 Title: Managing Strategic Inventories under Investment in Process Improvement <br/> <br/>Author, co-author: Mantin, Benny; Veldman, Jasper http://hdl.handle.net/10993/39741 Title: Airline business models and their network structures <br/> <br/>Author, co-author: Lange, Anne; Bier, Tobias http://hdl.handle.net/10993/39665 Title: Bankruptcy protection in airline markets: Does the impact vary in international and US domestic markets? <br/> <br/>Author, co-author: Mantin, Benny; Forsyth, Peter; Bock, Sebastian; Niemeier, Hans-Martin <br/> <br/>Abstract: We study the effects of Chapter 11 bankruptcy protection on competitive product pricing in both domestic and international markets using data from the airline industry. We find a decline of about 5% in domestic markets and an even more significant drop in international markets. Further, in international markets the competing carriers respond by dropping their prices as well, whereas they slightly increase them domestically. By contrast, existing literature considers only domestic markets finding a more moderate fare drop of about 3% in domestic markets by the bankrupt carrier, with mixed results on the fare drop by competitors. http://hdl.handle.net/10993/39664 Title: Chapter 11 and the Level Playing Field: Should Chapter 11 be Considered as a Subsidy? <br/> <br/>Author, co-author: Mantin, Benny; Bock, Sebastian; Forsyth, Peter; Niemeier, Hans-Martin <br/> <br/>Abstract: This paper assesses whether Chapter 11 is a form of subsidy for US airlines. US airlines have used Chapter 11 to restructure their operations. This has been criticized as a subsidy by major non US airlines and governments for a long time and recently, in the “level playing field” debate. Applying legal and economic perspectives of subsidy, we examine the different opportunities of Chapter 11 to reduce airlines’ costs. It is argued that most of the forms available, such as the modification of collective bargaining, do not constitute a subsidy. Only the termination of pension plans might involve a subsidy, but only using a legal definition of doubtful relevance since there is normally no use of public funds. http://hdl.handle.net/10993/39653 Title: Price volatility and market performance measures: The case of revenue managed goods <br/> <br/>Author, co-author: Mantin, Benny; Rubin, Eran <br/> <br/>Abstract: The operational outcome of Revenue Management (RM) is manifested in different magnitudes of market level price volatilities. In this paper we take an analytics approach to the possible use of pricing data of revenue-managed goods to support market analysis. Quantifying the relationship between market-level price volatility in the airline industry and various market-level performance metrics, we find that higher levels of price volatility are associated with higher levels of transacted fares, lower load factors, higher revenues, and increased transacted fare dispersion. This suggests the potential in utilizing market price volatility as an input for market analytics. http://hdl.handle.net/10993/39226 Title: Convergence in airline operations: The case of ground times <br/> <br/>Author, co-author: Lange, Anne; Sieling, Julian; Gonzalez Parra, Garoe http://hdl.handle.net/10993/38281 Title: Centrality in Strategic Transportation Network Design – An application to less-than-truckload networks. <br/> <br/>Author, co-author: Paul, Anne http://hdl.handle.net/10993/38280 Title: A Formation Model for Supply Networks: a Fundament for Investigations of complex Supply Networks. <br/> <br/>Author, co-author: Bier, Tobias; Lange, Anne http://hdl.handle.net/10993/37064 Title: Celebrating the 10th volume of IJISM: a bibliographic review and outlook <br/> <br/>Author, co-author: Glock, Christoph H.; Lange, Anne; Grosse, Eric H.; Das, Ajay <br/> <br/>Abstract: The purpose of this paper is to evaluate research trends observed in the International Journal of Integrated Supply Management (IJISM) during its first 10 volumes, which extend over a total of 175 research papers published between 2004 and 2016. The work at hand first develops a conceptual framework for classifying papers that appeared in IJISM. Papers are then assigned to the framework to identify popular research topics and research methodologies used, and to highlight publication patterns that could be observed in the first 10 volumes of the journal. The paper concludes with an outlook on possible perspectives for the journal. http://hdl.handle.net/10993/36954 Title: Economies of scale in recoverable robust maintenance location routing for rolling stock <br/> <br/>Author, co-author: Arts, Joachim; Tönissen, Denise <br/> <br/>Abstract: We consider the problem of locating maintenance facilities in a railway setting. Different facility sizes can be chosen for each candidate location and for each size there is an associated annual facility costs that can capture economies of scale in facility size. Because of the strategic nature of facility location, the opened facilities should be able to handle the current maintenance demand, but also the demand for any of the scenarios that can occur in the future. These scenarios capture changes such as changes to the line plan and the introduction of new rolling stock types. We allow recovery in the form of opening additional facilities, closing facilities, and increasing the facility size for each scenario. We provide a two-stage robust programming formulation. In the first-stage, we decide where to open what size of facility. In the second-stage, we solve a NP-hard maintenance location routing problem. We reformulate the problem as a mixed integer program that can be used to make an efficient column-and-constraint generation algorithm. To show that our algorithm works on practical sized instances, and to gain managerial insights, we perform a case study with instances from the Netherlands Railways. A counter intuitive insight is that economies of scale only play a limited role and that it is more important to reduce the transportation cost by building many small facilities, rather than a few large ones to profit from economies of scale. http://hdl.handle.net/10993/36905 Title: Does cargo matter? The impact of air cargo operations on departure on-time performance for combination carriers <br/> <br/>Author, co-author: Lange, Anne http://hdl.handle.net/10993/36904 Title: The impact of hubbing concentration on flight delays within airline networks: An empirical analysis of the US domestic market <br/> <br/>Author, co-author: Baumgarten, Patrick; Malina, Robert; Lange, Anne <br/> <br/>Abstract: This paper explores the relationship between hubbing activities and flight delays in the United States from an airline-specific network perspective. Airline hubbing is measured with the Hubbing Concentration Index. We estimate the impact of hubbing behavior on delays, using three measures of delay, two based on delay against schedule, and the third based on buffer-corrected excess travel times. A significant (and positive) influence of hubbing concentration can only be found for the latter delay indicator. We conclude that airlines use buffer times to mitigate passenger-perceived delays against schedule that would, without buffers, arise from more complex network operations. (C) 2014 Elsevier Ltd. All rights reserved. http://hdl.handle.net/10993/36903 Title: Robust Scheduling: An Empirical Study of Its Impact on Air Traffic Delays <br/> <br/>Author, co-author: Lonzius, Marc Christopher; Lange, Anne <br/> <br/>Abstract: We develop an econometric model to analyze the real-life impact of two robust scheduling approaches, namely limiting hub connectivity and implementing swap opportunities, based on a broad dataset of the U.S. domestic market. Our analysis is from a novel aircraft routing perspective. We confirm a delay-driving effect of direct hub connectivity and a delay-reducing effect of swap opportunities. Indirect hub connectivity provides airlines with another approach to limit delays. We furthermore contrast that the business model of Southwest Airlines cannot leverage the delay-reducing effects resulting from swap opportunities. (C) 2017 Elsevier Ltd. All rights reserved. http://hdl.handle.net/10993/36902 Title: Network concentration indices for less-than-truckload transportation <br/> <br/>Author, co-author: Lange, Anne; Delfmann, Werner <br/> <br/>Abstract: An efficient and service-oriented transportation network is a necessary resource for successful less-than-truckload operations. The design and evaluation of transportation networks are mainly driven by quantitative particularly cost-oriented measures, such as transport and transshipment costs. This type of measurement, however, simply cannot represent the manifold performance of a transportation network. In particular, incorporating network concentration into network design decisions overcomes the shortcomings of purely cost-oriented decisions because spatial network concentration is at the root of many aspects of network performance (e.g., congestion and network vulnerability). This paper suggests modifications to the network concentration index and the hubbing concentration index from the passenger airline context for less-than-truckload road transportation. The modified indices enable information to be conveyed by network concentration into less-than-truckload network design decisions and provide a suitable perspective to include service-oriented aspects into network design. http://hdl.handle.net/10993/36901 Title: Purchase Order Financing: Credit, Commitment, and Supply Chain Consequences <br/> <br/>Author, co-author: Reindorp, Matthew; Tanrisever, Fehmi; Lange, Anne <br/> <br/>Abstract: We study a supply chain where a retailer buys from a supplier who faces financial constraints. Informational problems about the supplier’s demand prospects and production capabilities restrict her access to capital. By committing to a minimum purchase quantity, the retailer can mitigate these informational problems and expand the supplier’s feasible production set. We assume a newsvendor model of operations and analyze the strategic interaction of the two parties as a sequential game. Key parameters in our model are the supplier’s ex ante credit limit, her informational transparency—which conditions the amount of additional capital released by the commitment—and the demand characteristics of the final market. We show that in equilibrium the supplier can benefit from a lower ex ante credit limit or lower informational transparency. The retailer always benefits from an increase in these parameters. We also indicate limits to the commitment approach: under certain conditions, the retailer may prefer to relax the supplier’s financial constraint by adjusting the wholesale price, or a combination of wholesale price and commitment. Our study provides a novel perspective on capital market frictions in supply chains. The e-companion is available at https://doi.org/10.1287/opre.2018.1727. http://hdl.handle.net/10993/36600 Title: Maintenance location routing for rolling stock under line and fleet planning uncertainty <br/> <br/>Author, co-author: Tönissen, Denise; Arts, Joachim; Shen, Zuo-Jun http://hdl.handle.net/10993/35948 Title: Forecasting sales of new virtual goods with the Elo rating system <br/> <br/>Author, co-author: Yang, Lin; Dimitrov, Stanko; Mantin, Benny