Kummer, Sebastian. 2014. Lessons learned from European Logistics and Supply Chain Management;Current Status, Challenges, Case Studies. Guest lecture, Xi’an University of Posts and Telecommunications, Xi’an, Shaanxi Province, 11.10. Kummer, Sebastian.
A cost function is subadditive when a single firm can produce all relevant output vectors cheaper than two or more firms. In order to do so the test developed by Evans and Heckman (1984) will be used.
IEEE Engineering in Medicine and Biology Society conference proceedings, 2007, pp. 5972-5975. IEEE Engineering in Medicine and Biology Society conference proceedings, 2007, pp. 3741-3744.
2019. Importance of key success factors for local and international NGOs in humanitarian supply chain.
For the procuring authorities, it has been a rather long period of learning over time how to improve the tendering process, also affected by Sweden’s entry to the European Union in 1995. Although there are several positive effects to highlight, such as innovation and reduced subsidies, there is also reason to consider problems like unfulfilled bids, the predatory behaviour of some bidders, and sometimes worsened possibilities for passengers to find connecting journeys involving several operators. Moreover, SJ’s (the state-owned operator) remaining monopoly on its so-called profitable lines affects the general competitive situation and prospects for sector development. The paper also includes some general statistical data reflecting the development of the Swedish railways in recent years.
Series B – biological sciences, 274(1628), pp. 3019-3025. Proceedings of the 12th International Congress on the Chemistry of Cement. Proceedings of the Institution of Mechanical Engineers. Part H – journal of engineering in medicine, 221(7), pp. 739-53.
In particular, the extension in time of previously-used datasets offers the first opportunity to study the impacts of re-franchising. The previous literature emphasised the failure of franchising to produce sustained productivity gains, with a sharp deterioration in productivity after 2000. The new evidence presented offers a somewhat more positive view of the British experience.
Calculation of CO2 Emissions for Partial Loads and Mixed Laden Transport Units in Multilevel Transport Chains with www.co2tec.com. European Transport Conference 2012, Glasgow, Großbritannien, 8. 10.10.2012. Azmat, Muhammad, Kummer, Sebastian.
Proceedings of the Royal Society. Series B – biological sciences, 275(1634), pp. 519-526. Clinical journal of the American Society of Nephrology, 2(3), pp. 454-60.
Tran, Thi Huong and Kummer, Sebastian. 2016. Analyzing logistics risk in food supply chain using AHP and ANP methods. 28th European Conference on Operational Research, Poznan, Poland, 03.07-06.07. This study uses stochastic frontier analysis for estimating efficiencies of railways systems in European countries.