• New computational results for the nurse scheduling problem: A scatter search algorithm

      Maenhout, Broos; Vanhoucke, Mario (2006)
      In this paper, we present a scatter search algorithm for the well-known nurse scheduling problem (NSP). This problem aims at the construction of roster schedules for nurses taking both hard and soft constraints into account. The objective is to minimize the total preference cost of the nurses and the total penalty cost from violations of the soft constraints. The problem is known to be NP-hard. The contribution of this paper is threefold. First, we are, to the best of our knowledge, the first to present a scatter search algorithm for the NSP. Second, we investigate two different types of solution combination methods in the scatter search framework, based on four different cost elements. Last, we present detailed computational experiments on a benchmark dataset presented recently, and solve these problem instances under different assumptions. We show that our procedure performs consistently well under many different circumstances, and hence, can be considered as robust against case-specific constraints. Keywords: meta-heuristics, scatter search, nurse scheduling
    • Offshoring as a Survival Strategy in Globalizing Industries: New Evidence from Belgian Manufacturing

      Coucke, Kristien; Sleuwaegen, Leo (2007)
      This paper analyzes the impact of globalization on the exit behavior of manufacturing firms in one of the world's most open economies: Belgium. We find that imports from low-wage countries exert a strong competitive effect that lowers a firm's chances of survival. This competitive effect is found to arise mainly in industries where intra-industry trade, an indicator of product differentiation, is relatively low. As an offensive strategy to cope with the rising competitive pressure from imports, we find that firms exploiting opportunities afforded by globalization, in particular the off-shoring of activities, are able to improve their chances of survival. Making a distinction between domestic firms and subsidiaries of multinational firms, we also find that domestic firms face a higher risk of exit when multinational firms compete in their relevant input and output markets. Finally, we show that subsidiaries of multinational firms are better adapted to cope with globalization forces, and we find them to be less sensitive to domestic market conditions in the host country. Keywords: Exit, Off-shoring, Sourcing, Globalization JEL Code: F1, F23, L2
    • On the morphological structure of a network

      Vanhoucke, Mario; Coelho, José; Debels, Dieter; Tavares, Luis (2004)
      In literature, both topological and resource-related measures are used to predict the difficulty of a project scheduling problem. Rapid progress regarding solution procedures has resulted in the development of a number of data generators in order to generate instances under a controlled design and in different standard sets with problem instances. These complexity measures need to serve as predictors for the complexity of the problem under study. In this paper, we report on results for the topological structure of a network. The contribution of this paper is threefold. First, we review six topological network indicators in order to describe the structure of a network in a detailed way. These indicators were originally developed by [20] and have been modified or sometimes completely replaced by alternative indicators in order to give a better description of the topology of a network. Secondly, we generate a large amount of different networks with four network generators. This allows us to draw conclusions on both the performance of different network generators and to give a critical remark on well-known datasets from literature. Our general conclusions are that none of the network generators are able to capture the complete feasible domain of all networks. Moreover, each network generator covers its own network-specific domain and, consequently, contributes to the generation of instance data sets. Finally, we perform computational results on the well-known resource-constrained project scheduling problem to proof that our indicators are reliable and have significant predictive power to serve as complexity indicators. Keywords: Networks, Topological structure, Graphs, Project Scheduling instances
    • On the Morphological Structure of a Network

      Vanhoucke, Mario; Coelho, José; Tavares, Luis; Debels, Dieter (UGent, Fac. Economie & Bedrijfskunde, 2004)
    • On the performance of listed private equity

      Ain Tommar, Sara (2018)
      Listed private equity (LPE) refers to publicly-traded investment companies whose activity is to invest in privately-held companies or in traditional private equity funds. The recent years have witnessed a slew of such listings and many investors were offered exposure to traditional private equity investments (TPE) through LPE. While listed private equity and traditional private equity have the same investment universe, we argue that the performance of the latter does not pertain to LPE. We build a representative dataset of the LPE universe and compare their performance to TPE. We examine whether belonging to indices and having minimum liquidity requirements is linked to performance. Our results suggest that listing significantly deteriorates absolute performance measures but is positively and significantly related to better investment multiples.
    • Oorzaken van faling en falingspaden: literatuuroverzicht en conceptueel verklaringsmodel

      Ooghe, Hubert; Waeyaert, Nick (UGent, Fac. Economie & Bedrijfskunde, 2003)
    • Open Innovation and R&D Globalization

      Vanhaverbeke, Wim; von Zedtwitz, Max; Du, Jingshu
    • Opening the black box of efficiency measurement: input allocation in multi-output settings

      Cherchye, Laurens; De Rock, Bram; Dierynck, Bart; Roodhooft, Filip; Sabbe, Jeroen (2011)
    • Openness to organizational change: the contribution of content, context, and process

      Devos, Geert; Buelens, Marc (Vlerick Business School, 2003)
      The present study examined the contribution to employees' openness to change of the content, context, and process of organizational transformation. The threatening character of organizational change (content variable), trust in executive management, trust in the supervisor, history of change (context variables), and participation in the change effort (process variable) were predicted to have a positive effect on openness to change. Hypotheses were tested in two separate studies (N = 828 and N = 835) using experimental vignettes. A first study crossed four variables in a fully crossed 2 × 2 × 2 × 2 design. Results showed significant main effects and no interaction effects for content, context, and process. A second study, with a fully crossed 2 × 2 design crossed two context variables, history of change and trust in top management. Results showed significant main and significant interaction effects. It was only when history of change and trust in executive management were low that openness to change dramatically decreased.
    • Optimal due date assignment in project scheduling

      Vanhoucke, Mario (Vlerick Business School, 2002)
      In this paper we introduce the concept of due date assignment in the project scheduling literature. Despite the fact that due date assignment problems belongs to the core of the machine scheduling literature, no attempts have been made to tackle this problem in a project scheduling environment. However, of obvious practical importance, an optimal assignment of due dates is of primary interest to the project manager. In a recent research paper on project scheduling with due dates, the problem has been restricted to considering projects with pre-assigned due dates. In reality, due dates are the results of negotiations, rather than simply dictated by the client of the project. In this paper we consider this negotiation process and take a contractor's point of view who faces the problem of assigning due dates to a particular project, based on the negotiation arguments of the client. We show that the problem under study can be solved by means of the combination of different ideas from the operations research community. Keywords: Project Management, Due date assignment, Weighted earliness-tardiness costs, Due dates,
    • Organizational versus individual responsibility for career management: complements or substitutes

      De Vos, Ans; Buyens, Dirk (Vlerick Business School, 2005)
      This paper explores the relationship between organizational career management and career self-management and addresses their impact on employee outcomes. The results of a study among employees and linemanagers are presented, which partly support our hypotheses. The interaction between organizational and individual career management in explaining employee outcomes is discussed.
    • Outside board members in the high-tech start-ups

      Clarysse, Bart; Knockaert, Mirjam; Lockett, Andy (2006)
      Board composition in large organizations has been subject to much empirical research, however, little attention has been focused on board composition in start-ups, and more specifically high tech start-ups. This lack of research is surprising given that many high tech start-ups have multiple equity stakeholders such as venture capitalists or public research organizations, such as universities. Given that high tech start-ups are commonly resource-poor these external stakeholders may play an important role in accessing critical external resources. Drawing on agency theory, resource dependence theory and social network theory we examine the tensions that exist between the founding team and external equity stakeholders in determining the presence of outside board members. In particular we focus on whether or not the outside board members have either complementary or substitute human capital to the founding team. We test our model on a sample of 140 high tech start-ups in Flanders. Our results indicate that high tech start-ups with a public research organization as an external equity stakeholder are more likely to develop boards with outside board members with complementary skills to the founding team. Conversely, in high tech start-ups where the founding team has had autonomy, or where a venture capitalist is an external equity stakeholder, the board tends to consist of outside board members with similar or substitute human capital to the founding team. Our findings the presence of an external equity stakeholder does not guarantee that outside board members have complementary human capital to the founding team.
    • Pandemic Influenza Vaccine Allocation Protocol

      Samii, Behzad; Pibernik, Richard; Yadav, Prashant; Vereecke, Ann (2011)
    • Performance management: A value drivers approach

      Hawawini, G.; Subramanian, Venkat; Verdin, Paul (2002)
    • Practitioner's view on project performance: a three-polar construct

      Vandevelde, Anneke; Van Dierdonck, Roland; Debackere, Koenraad (Vlerick Business School, 2002)
      There is no consensus on the construct project performance. This article examines how to suitably operationalise ‘project performance' as it is viewed by practitioners. An alternative research approach, based on the repertory grid method, was used in combination with a survey to develop a three-polar framework of the construct project performance. The model stresses that the construct should be considered as multidimensional, including process, economic and indirect poles. It promotes a balance between financial and non-financial measures, between short- and long-term measures, between measures focusing on the past and measures directed at the firm's future drivers. The model confirms and enriches the existing research on project performance.