The KLU faculty, post-docs, and PhD candidates regularly publish the results of their research in scientific journals. You will find a complete overview of all KLU publications below (e.g. articles in peer-reviewed journals, professional journals, books, working papers, and conference proceedings). Search for relevant terms and keywords, or filter the list by name, year of publication or type of publication. The references include DOIs and abstracts where available, and you can download them to your own reference database or platform. We regularly update the database with new publications.
Journal Articles (Peer-Reviewed)
Goel, Asvin (2012): A Mixed Integer Programming Formulation and Effective Cuts for Minimising Schedule Durations of Australian Truck Drivers, Journal of Scheduling, 15 (6): 733-741.
Abstract: Transport companies seek to maximise vehicle utilisation and minimise labour costs. Both goals can be achieved if the time required to fulfil a sequence of transportation tasks is minimised. However, if schedule durations are too short drivers may not have enough time for recuperation and road safety is impaired. In Australia transport companies must ensure that truck drivers can comply with Australian Heavy Vehicle Driver Fatigue Law and schedules must give enough time for drivers to take the amount of rest required by the regulation. This paper shows how transport companies can minimise the duration of truck driver schedules complying with Australian Heavy Vehicle Driver Fatigue Law. A mixed integer programming formulation is presented and valid inequalities are given. Computational experiments show that these inequalities provide significant reduction in computational effort when using one of the most advanced commercial mixed integer programming solver.
Holweg, Matthias and Frits K. Pil (2012): Outsourcing Complex Business Processes: Lessons from an Enterprise Partnership, California Management Review, 54 (3): 98-115.
Abstract: Outsourcing initiatives are key to firm efforts to focus on core competencies, alter engrained practices and attain significant cost reductions in non-core processes. Extensive thought goes into the selection of outsourcing service providers, with the aim of enlisting vendors that have the competence and reputation to lower cost and enhance service levels. However, in addition to traditional fee-for-service outsourcing, another option is to develop a new enterprise that is wholly or partially owned by the outsourcing entity to take on the activities that are externalized—a so-called “enterprise partnership.” This article examines one of the first examples of such a partnership: BAE Systems' efforts to outsource its HR services in collaboration with Xchanging. It tracks the evolution of the resulting enterprise partnership from the perspective of both the new vendor and the outsourcing firm. The article also discusses the need for explicit contractual recognition of key phases of the outsourcing life cycle as a means to reduce inevitable in-process conflict. Understanding the divergence of interests that naturally emerge is critical to realizing the long-term promise that enterprise partnerships offer.
Goel, Asvin (2012): The Canadian Minimum Duration Truck Driver Scheduling Problem, Computers & Operations Research, 39 (10): 2359-2367.
Abstract: In Canada transport companies must ensure that truck drivers can comply with Canadian Commercial Vehicle Drivers Hours of Service Regulations. Canadian regulations comprise the provisions found in US hours of service regulations as well as additional constraints on the maximum amount of driving and the minimum amount of off-duty time on each day. This paper presents a mixed integer programming formulation and an iterative dynamic programming approach for minimising the duration of truck driver schedules complying with Canadian hours of service regulations. Computational experiments show that schedule durations can be significantly reduced compared with a previously presented approach which only focuses on feasibility.
Van Quaquebeke, Niels and Daan van Knippenberg (2012): Second‐Generation Leader Categorization Research: How Subordinates' Self‐and Typical Leader Perceptions Moderate Leader Categorization Effects, Journal of Applied Social Psychology, 42 (6): 1293-1319.
Abstract: Leader categorization theory proposes that the more leaders match their subordinates' cognitive image (prototype) of an ideal leader the easier it is for subordinates to “categorize” them as leaders and consequently follow their leadership. Based on self-concept research, we extend this perspective and argue that the relationship assumed in leader categorization theory should be stronger when subordinates perceive themselves to represent the ideal leader prototype. Further, this moderating effect should be stronger when subordinates perceive the ideal leader prototype to not only be an abstract ideal category, but one that is generally also met in reality; i.e., when it is met by typical leaders. Findings of a cross-sectional study with employees in Germany (N = 297) support both predictions.
Meissner, Joern and Arne K. Strauss (2012): Network revenue management with inventory-sensitive bid prices and customer choice, European Journal of Operational Research, 216 (2): 459-468.
Abstract: We develop an approximate dynamic programming approach to network revenue management models with customer choice that approximates the value function of the Markov decision process with a non-linear function which is separable across resource inventory levels. This approximation can exhibit significantly improved accuracy compared to currently available methods. It further allows for arbitrary aggregation of inventory units and thereby reduction of computational workload, yields upper bounds on the optimal expected revenue that are provably at least as tight as those obtained from previous approaches. Computational experiments for the multinomial logit choice model with distinct consideration sets show that policies derived from our approach can outperform some recently proposed alternatives, and we demonstrate how aggregation can be used to balance solution quality and runtime.
Stäblein, Thomas, Matthias Holweg and Joe Miemczyk (2011): Theoretical versus actual product variety: How much customisation do customers really demand?, International Journal of Operations & Production Management, 31 (3): 350-370.
Nuttall, William J., Matthias Holweg and Michael E. Leybovich (2011): Too Big to Fail — Lessons for Today and the Future from British Industrial Policy, 1960–1990, Technological Forecasting and Social Change, 78 (8): 1286-1298.
Christopher, Martin and Matthias Holweg (2011): “Supply Chain 2.0”: Managing supply chains in the era of turbulence, International Journal of Physical Distribution & Logistics Management, 41 (1): 63-82.
Baur, Dirk G. (2011): Explanatory mining for gold: Contrasting evidence from simple and multiple regressions, Resources Policy, 36 (3): 265-275.
Abstract: Gold traditionally has been used as a store of value and an inflation hedge. More recently, gold is also viewed as a hedge against uncertainty and a safe haven. This paper demonstrates that many properties regularly associated with gold are only valid in a simple regression framework but significantly change in a multiple regression framework. A descriptive and econometric analysis of gold and US economic and financial variables for monthly data from 1979 to 2011 shows that gold primarily serves as a hedge against a weaker US dollar and against higher commodity prices. In contrast, gold is not a hedge against consumer price inflation. The empirical results also indicate that gold only recently evolved as a safe haven asset.
Transchel, Sandra and Stefan Minner (2011): Economic lot-sizing and dynamic quantity competition, International Journal of Production Economics, 133 (1): 416-422.
Abstract: We study a problem of dynamic quantity competition in continuous time with two competing retailers facing different replenishment cost structures. Retailer 1 faces fixed ordering costs and variable procurement costs and all inventory kept in stock is subject to holding costs. Retailer 2 only faces variable procurement costs. Both retailers are allowed to change their sales quantities dynamically over time. Following the structure of the economic order quantity (EOQ) model, retailer 1 places replenishment orders in batches and retailer 2 follows a just-in-time (JIT) policy. The objective of both retailers is to maximize their individual average profit anticipating the competitor's replenishment and output decisions. The problem is solved by a two-stage hierarchical optimization approach using backwards induction. The second-stage model is a differential game in output quantities between the two retailers for a given cycle length. At the first stage, the replenishment policy is determined. We prove the existence of a unique optimal solution and derive an open-loop Nash equilibrium. We show that both retailers follow contrary output strategies over the order cycle. The EOQ retailer, driven by inventory holding costs, decreases his market share whereas the output of the JIT retailer increases. Moreover, depending on the cost structure, the EOQ retailer might partially be a monopolist. At the first stage, the EOQ retailer determines the cycle length, anticipating the optimal output trajectories at the second stage.
Franklin, J. Rod and Stefan Spinler (2011): Shared Warehouses – Sharing Risks and Increasing Eco-efficiency, International Commerce Review, 10 (1): 22-31.
Van Quaquebeke, Niels, Daan van Knippenberg and Tilman Eckloff (2011): Individual differences in the leader categorization to openness to influence relationship The role of followers’ self-perception and social comparison orientation, Group Processes and Intergroup Relations, 14 (5): 605-622.
Abstract: Contemporary so called follower-centric leadership theories often argue that “good leadership is in the eye of the beholder”. Leader categorization theory, for instance, suggests that subordinates use their cognitive representation of an ideal leader (ideal leader prototype) as an implicit “benchmark” to determine their openness towards the target’s leadership, i.e., influence. With the present study, we extend this rationale by hypothesizing that such benchmarking processes are subject to follower individual differences. In particular, we argue that the process of leader categorization plays a bigger role for subordinates who perceive themselves as ideal (potential) leaders. Moreover, this two-way moderation is proposed to be further qualified by subordinates’ disposition to engage in social comparison orientation. Results of two field samples with employees (N = 140; N = 287) confirm our hypotheses. In integrating the leader categorization perspective with an individual difference perspective, we not only expand the scope of follower-centric theorizing on social influence, but also support its validity.
Graf, Matthias M., Niels Van Quaquebeke and Rolf van Dick (2011): Two independent value orientations: ideal and counter-ideal leader values and their impact on followers’ respect for and identification with their leaders, Journal of Business Ethics, 104 (2): 185-195.
Abstract: Traditionally, conceptualizations of human values are based on the assumption that individuals possess a single integrated value system comprising those values that people are attracted by and strive for. Recently, however, van Quaquebeke et al. (in J Bus Ethics 93:293–305, 2010) proposed that a value system might consist of two largely independent value orientations—an orientation of ideal values and an orientation of counter-ideal values (values that individuals are repelled by), and that both orientations exhibit antithetic effects on people’s responses to the social world. Following a call for further research on this distinction, we conducted two studies to assess the independent effects of ideal and counter-ideal values in leadership settings. Study 1 (N = 131) finds both value orientations to explain unique variance in followers’ vertical respect for their leaders. Study 2 (N = 136) confirms these results and additionally shows an analogous effect for followers’ identification with their leaders. Most importantly, we find that both value orientations exhibit their effects only independently when the content of the two orientations pertain to different value types in Schwartz’s (in J Soc Issues 50:19–46, 1994) circumplex model. Implications for theory and practice are discussed.
Hinz, Oliver, Bernd Skiera, Christian Barrot and Jan U. Becker (2011): Seeding strategies for viral marketing: An empirical comparison, Journal of Marketing, 75 (6): 55-71.
Holweg, Matthias (2011): Why there is no Insignificance for a Relevant Question, Journal of Supply Chain Management, 47 (4): 19-20.
Witte, Erich H., Christina Mölders and Niels Van Quaquebeke (2011): Gerechtigkeit durch Sonderbehandlung? Wie Bürger Ausnahmeregelungen im Einkommensteuergesetz bewerten, Wirtschaftspsychologie, 13 (1): 29-42.
Abstract: Dem deutschen Einkommensteuergesetz wird häufig vorgeworfen, es sei aufgrund seiner zahlreichen Ausnahmeregelungen zu komplex. In der hier beschriebenen Online-Studie (N = 742) wurden 82 Ausnahmen aus dem Einkommensteuergesetz auf ihre Gerechtigkeit und Wichtigkeit sowie die Angemessenheit der angesetzten Freibeträge und Freigrenzen beurteilt. Zusätzlich wurde erhoben, für welche gesellschaftlichen Gruppen Ausnahmeregelungen als gerecht empfunden werden. Es zeigt sich, dass nur wenige Ausnahmen als ungerecht und unwichtig (M < 3) eingeschätzt werden. Allerdings findet sich auch eine Beurteilung als eindeutig gerecht und wichtig (M > 4) nur in einer überschaubaren Fallzahl. Gerechtigkeits- und Wichtigkeitseinschätzungen hängen dabei eng zusammen. Als generell begünstigenswert gelten in erster Linie bedürftige, abhängige und leistungsschwache Gruppen wie Menschen mit Behinderung, Familien oder Kleinunternehmer. Über die verschiedenen Ausnahmen hinweg lässt sich allerdings keine entsprechende klare Struktur in der Bewertung der einzelnen Ausnahmen auffinden. Dabei besteht auch kein korrelationsstatistischer Zusammenhang zwischen sozioökonomischen Daten und der Bewertung der Ausnahmen bzw. den Angaben zu den zu begünstigenden Gruppen. Diese Erkenntnisse ermöglichen Hinweise für zukünftige Modifikationen des Gesetzes.
Leeuw, Sander de, Matthias Holweg and Geoff Williams (2011): The Impact of Decentralised Control on Firm-Level Inventory: Evidence from the Automotive Industry, International Journal of Physical Distribution & Logistics Management, 41 (5): 435-456.
Kopp, Oliver, Matthias Wieland, Tobias Unger, Steve Strauch, Mirko Sonntag, David Schumm, Michael Reiter, Frank Leymann, Dimka Karastoyanova, Katharina Görlachf and Rania Khala (2011): A Classification of BPEL Extensions, Journal of Systems Integration, 2 (4): 3-28.
Abstract: The Business Process Execution Language (BPEL) has emerged as de-facto standard for business processes implementation. This language is designed to be extensible for including additional valuable features in a standardized manner. There are a number of BPEL extensions available. They are, however, neither classified nor evaluated with respect to their compliance to the BPEL standard. This article fills this gap by providing a framework for classifying BPEL extensions, a classification of existing extensions, and a guideline for designing BPEL extensions.
Holweg, Matthias, Andreas Reichhart and Eui Hong (2011): On Risk and Cost in Global Sourcing, International Journal of Production Economics, 131 (1): 333-341.
Giessner, Steffen R., Michelle K. Ryan, Thomas W. Schubert and Niels Van Quaquebeke (2011): The power of pictures: Vertical picture angles in power pictures, Media Psychology, 14 (4): 442-464.
Abstract: Conventional wisdom suggests that variations in vertical picture angle cause the subject to appear more powerful when depicted from below and less powerful when depicted from above. However, do the media actually use such associations to represent individual differences in power? We argue that the diverse perspectives of evolutionary, social learning, and embodiment theories all suggest that the association between verticality and power is relatively automatic and should, therefore, be visible in the portrayal of powerful and powerless individuals in the media. Four archival studies (with six samples) provide empirical evidence for this hypothesis and indicate that a salience power context reinforces this effect. In addition, two experimental studies confirm these effects for individuals producing media content. We discuss potential implications of this effect.
Van Quaquebeke, Niels, Daan van Knippenberg and Felix C. Brodbeck (2011): More than meets the eye: The role of subordinates' self-perceptions in leader categorization processes, The Leadership Quarterly, 22 (2): 367-382.
Abstract: Leader categorization theory suggests that subordinates implicitly compare their leaders with a cognitively represented ideal image of a leader, i.e., an ideal leader prototype. The better the match, the more favorable subordinates' attitudes toward their leaders will be. We suggest, however, that subordinates not only perceive their leaders against the backdrop of a leader prototype but also themselves. Based on socio-cognitive research, we hypothesize that these self-perceptions in turn should lend more weight to the leader prototype as a benchmark. Three field studies with employees (N = 87; N = 265; N = 385) were undertaken to test our hypothesis. Results confirm that subordinates' perceptions of their leaders against an ideal leader prototype are related to subordinates' respect for their leaders and leadership effectiveness perceptions, and that these relationships are moderated by subordinates' self-perceptions against the ideal leader prototype. This study therefore extends current follower-centric perspectives on leadership and strengthens its ties with fundamental socio-cognitive research.
Schumm, David, Dimka Karastoyanova, Oliver Kopp, Frank Leymann, Mirko Sonntag and Steve Strauch (2011): Process Fragment Libraries for Easier and Faster Development of Process-based Applications, Journal of Systems Integration, 2 (1): 39-55.
Abstract: The term “process fragment” is recently gaining momentum in business process management research. We understand a process fragment as a connected and reusable process structure, which has relaxed completeness and consistency criteria compared to executable processes. We claim that process fragments allow for an easier and faster development of process-based applications. As evidence to this claim we present a process fragment concept and show a sample collection of concrete, real-world process fragments. We present advanced application scenarios for using such fragments in development of process-based applications. Process fragments are typically managed in a repository, forming a process fragment library. On top of a process fragment library from previous work, we discuss the potential impact of using process fragment libraries in cross-enterprise collaboration and application integration.
Janzik, Lars, Cornelius Herstatt and Christina Raasch (2011): Warum Kunden in Online-Communities innovieren: Ergebnisse einer Motiveanalyse, Zeitschrift für Betriebswirtschaft, 81 (5): 47-81.
Abstract: For companies, online communities (OCs) have become a potent means of rapidly and easily identifying user needs as a result of the social and technological changes within the Web 2.0. Some OCs even are suited ideally for integration into NPD as they frequently have innovative members. Despite their growing relevance, however, user innovation activities within OCs still are underexplored. The members’ motivations to innovate and contribute to OCs in particular are part of a young line of research requiring further investigation. This research provides an in-depth netnographic analysis of innovative, privately operated OCs dedicated to tangible consumer products. Most fundamentally, we differentiate 1) motives to join OCs, 2) motives to innovate, and 3) motives to publish innovations in OCs. This is the first study to categorize the motives of innovative OC members depending on the stages of their membership as well as situational factors. Our results support companies in understanding and classifying the members’ motives in independent customer OCs. This is a precondition for the development of specific incentives that stimulate innovative user activities in OCs and contribute to customer integration.
Baur, Dirk G. (2011): Do Football Clubs Benefit from Initial Public Offerings?, International Journal of Sport Finance, 6 (1): 40-59.
Abstract: This study analyzes the effects of initial public offerings (IPO) on the performance of European football clubs. We use a unique panel dataset consisting of domestic and international performance data to investigate a football club’s on-field performance before and after going public. The study finds that the performance of football clubs does not improve on average with or after an IPO. Only football clubs in lower divisions benefit from a stock market listing. At the international level, there is no evidence of an improved performance associated with the IPO. The findings are consistent with shareholder ownership imposing tacit restrictions towards excessive debt and investments.