29th of March 2017
Last week, the annual meeting was a succes. We thank all ±160 attendants for making this meeting a succes!
22nd of March 2017
The VvS+PR Annual Meeting is held in Room 417 of the Jaarbeurs (Beatrix building).
12th of March 2017
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5th of January 2017
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20th of April 2016
Submit your abstract and participate to the Second Conference of European Statistics Stakeholders, that will be held in Budapest, 20-21, October 2016.
18th of December 2015
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An Invitation Control Policy for Proactive Service Systems: Balancing Efficiency, Value and Service
||18th of May 2017
Galit Yom-Tov (Technion - Israel Institute of Technology) - An Invitation Control Policy for Proactive Service Systems: Balancing Efficiency, Value and Service Level
Thursday 18 May, 11.00-12.00, Room MF 11-12 (4th floor, MetaForum Building, TU/e)
Proactive service systems permit a controllable arrival rate managed by the service provider, which is different from classic service systems. Conceptually, some (or all) of the customers are invited to the system, so as to allow for a better control over operational indicators and profitability. Such a proactive service system is used, for example, to model an online chat service system, or for planning preventive care strategies for health care service providers.
Through an empirical study of a proactive chat service system, the validity of customer ranking information is elaborated for optimizing invitation control. It is also shown that service level measures can be formulated in terms of penalty for abandonment and cost of waiting. We also discuss the difference between external and internal waiting observed in such systems.
As a result, we develop an infinite-time-horizon multiclass multiserver queueing system with impatient invited customers. We find an asymptotically optimal policy using a fluid approximation, by solving a linear programming problem that maximizes revenues. The asymptotic optimal invitation policy we developed invites customers by their rμ ranking in decreasing order until there are no idle servers. Then, an equivalent threshold policy is proposed that is easy to implement in practice. Numerical simulations were performed to demonstrate the performance of the policy and identify its limitations. We show that the fluid policy has a good performance but is also crude.
In order to refine the fluid policy, we analyzed a fluid approximation of the system under a more flexible threshold policy, that is easily applicable. The equilibrium is found to be asymptotically stable and strongly depend on system parameters, including customers' patience that was previously ignored. Moreover, it depends on the threshold value applied. In order to propose an invitation policy that balances revenues and service level, the probability of implementing admission control is approximated, as well as other performance metrics.
Joint work with Yueming Xie and Liron Yedid-Zion
Upcoming events of the Eindhoven Stochastics Colloquium: http://www.win.tue.nl/StoSem/
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Room MF 11-12 (4th floor, MetaForum Building, TU/e)
30th of May 2017 - 30th of May 2017 | 12.45 Read more...
Utrecht, Janskerkhof 15a, room 101
2nd of June 2017 - 2nd of June 2017 | 11.15 Read more...
Radboud University Nijmegen, Heyendaalseweg 135.
22nd of June 2017 - 23rd of June 2017 Read more...
EURANDOM in Eindhoven
4th of September 2017 - 8th of September 2017 Read more...
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