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See detailInvited talk - TRANSINTER - erste Ergebnisse und zukünftige Pläne
Pit, Ineke UL; Glock, Sabine; Krolak-Schwerdt, Sabine UL

Conference given outside the academic context (2013)

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See detailStakeholders and quality assurance
Westerheijden, Don F.; Epping, Elisabeth UL; Faber, Marike et al

in Journal of the European Higher Education Area (2013), 2013(4), 71--86

How are stakeholders represented in higher education institutions? decision-making that influences the quality of education, and are their viewpoints taken into account? These were the main questions ... [more ▼]

How are stakeholders represented in higher education institutions? decision-making that influences the quality of education, and are their viewpoints taken into account? These were the main questions addressed in this part of the seven-country comparative study. Findings indicate that formal barriers are largely absent, that stakeholder influence has grown somewhat over recent years, but that actual influence of stakeholders can be further optimised in higher education institutions. [less ▲]

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See detailAn Integrated Guaranteed- and Stochastic-Service Approach to Inventory Optimization in Supply Chains
Klosterhalfen, Steffen UL; Dittmar, Daniel; Minner, Stefan

in European Journal of Operational Research (2013), 231

Multi-echelon inventory optimization literature distinguishes stochastic- (SS) and guaranteed-service (GS) approaches as mutually exclusive frameworks. While the GS approach considers flexibility measures ... [more ▼]

Multi-echelon inventory optimization literature distinguishes stochastic- (SS) and guaranteed-service (GS) approaches as mutually exclusive frameworks. While the GS approach considers flexibility measures at the stages to deal with stockouts, the SS approach only relies on safety stock. Within a supply chain, flexibility levels might differ between stages rendering them appropriate candidates for one approach or the other. The existing approaches, however, require the selection of a single framework for the entire supply chain instead of a stage-wise choice. We develop an integrated hybrid-service (HS) approach which endogenously determines the overall cost-optimal approach for each stage and computes the required inventory levels. We present a dynamic programming optimization algorithm for serial supply chains that partitions the entire system into subchains of different types. From a numerical study we find that, besides implicitly choosing the better of the two pure frameworks, whose cost differences can be considerable, the HS approach enables additional pipeline and on-hand stock cost savings. We further identify drivers for the preferability of the HS approach. [less ▲]

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See detailInvited talk - Prädiktoren und prognostische Validität der Sekundarschulempfehlungen in Luxemburg
Krolak-Schwerdt, Sabine UL; Klapproth, Florian

Conference given outside the academic context (2012)

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See detailDiagnostische Kompetenz von Grundschullehrkräften bei der Erstellung der Übergangsempfehlung
Krolak, Sabine UL; Glock, Sabine; Klapproth, Florian et al

Scientific Conference (2012, March)

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See detailA post-graduation policy perspective on international student mobility in four countries - shoud they stay or should they go?
Epping, Elisabeth UL; Vossensteyn, J. J.

in Th&Ma : Tijdschrift voor Hoger Onderwijs en Management (2012), 2012(1), 39--43

The mobility of international students is a major trend and highly supported in recent years, not only in the frame of exchange programs, but also in the form of degree mobility. Many foreign students ... [more ▼]

The mobility of international students is a major trend and highly supported in recent years, not only in the frame of exchange programs, but also in the form of degree mobility. Many foreign students move abroad to pursue a degree: in 1975, 600.000 students were mobile worldwide, compared to 2.8 million mobile students in 2007. Forecasts expect the number to increase to about 8 million by 2025 (OECD, 2009b). Critics claim that international student mobility typically shows a flow from the South to the North, in other words, from developing to developed countries. This may lead to a brain gain situation for developed countries and a brain drain for developing countries. The current article (based on the situation in 2010) explores to what extent four developed countries take measures to develop such a brain-drain brain-gain situation into a situation of brain-circulation. [less ▲]

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See detailThe pilot test and its outcomes
Callaert, Julie; Epping, Elisabeth UL; Federkeil, Gero et al

in van Vught, F. A.; Ziegele, F. (Eds.) Multidimensional ranking: the design and development of U-Multirank (2012)

This chapter describes the design and outcomes of the pilot test assessing the feasibility of implementing U-Multirank. The authors outline the construction of the global sample of institutions that ... [more ▼]

This chapter describes the design and outcomes of the pilot test assessing the feasibility of implementing U-Multirank. The authors outline the construction of the global sample of institutions that participated in the pilot test and discuss the feasibility of the data collection procedures and use of the various indicators presented in Chap. 7. Finally, they discuss the level of institutional interest in participating in the pilot and the potential upscaling of U-Multirank to a globally applicable multidimensional ranking tool. [less ▲]

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See detailData collection
Callaert, J.; Epping, Elisabeth UL; Federkeil, G. et al

in van Vught, F. A.; Ziegele, F. (Eds.) Multidimensional ranking: the design and development of U-Multirank (2012)

This chapter describes the data collection instruments used in the development of U-Multirank. The first section is an overview of existing databases - mainly on bibliometrics and patents. The second ... [more ▼]

This chapter describes the data collection instruments used in the development of U-Multirank. The first section is an overview of existing databases - mainly on bibliometrics and patents. The second describes the questionnaires and survey tools used for collecting data from the institutions - at the institutional and department levels - and from students. [less ▲]

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See detailTeacher's typology of student categories. A cluster analytic study
Hörstermann, Thomas UL; Krolak-Schwerdt, Sabine UL

Scientific Conference (2011, August)

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See detailA Comparison of the Constant-Order and Dual-Index Policy for Dual Sourcing
Klosterhalfen, Steffen UL; Kiesmüller, Gudrun; Minner, Stefan

in International Journal of Production Economics (2011), 133(1), 302-311

We analyze a single-product, periodic-review, stochastic demand inventory model with backorders and two supply options, a regular and a more expensive expedited one, with deterministic, offsetting lead ... [more ▼]

We analyze a single-product, periodic-review, stochastic demand inventory model with backorders and two supply options, a regular and a more expensive expedited one, with deterministic, offsetting lead times. Since the optimal policy for such a problem is generally unknown, several simpler policies have been proposed in the literature, e.g., the single-index (SIP), dual-index (DIP), or constant-order policy (COP). In previous research the DIP has been found to perform closely to the optimal policy in specific numerical settings. The COP, on the other hand, is very appealing from a practical point of view. We explore the relative cost performance of these two policies in a numerical study to gain insights into appropriate policy choices. We find that in settings, where dual sourcing is most valuable, the simpler COP delivers satisfactory results, sometimes even better ones than the DIP, and therefore represents a legitimate policy alternative for practical situations. [less ▲]

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See detailInvited talk - Leistungsbeurteilungen in der Schule
Krolak-Schwerdt, Sabine UL

Scientific Conference (2010, June)

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See detailSafety Stock Optimisation in Distribution Systems: A Comparison of Two Competing Approaches
Klosterhalfen, Steffen UL; Minner, Stefan

in International Journal of Logistics Research and Applications (2010), 13(2), 99-120

Contributions to multi-echelon safety stock optimisation can broadly be divided into models following either a stochastic- or guaranteed-service approach. These approaches form the basis of several ... [more ▼]

Contributions to multi-echelon safety stock optimisation can broadly be divided into models following either a stochastic- or guaranteed-service approach. These approaches form the basis of several commercial inventory optimisation software tools. To date, there is still a lack of a detailed comparison between the two approaches. This paper presents a cost comparison for two-stage distribution systems by means of a simulation study. The results indicate that the cost difference between the two approaches is quite small amounting to 4 at most. We observe that in most cases, the resulting (lower) internal warehouse service level is a good indicator for the superiority of an approach. The guaranteed-service approach shows a better performance for moderate flexibility costs, large warehouse processing times and high retailer service levels. [less ▲]

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