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Documents authored by Nikzad, Afshin

Document
DOI: 10.4230/LIPIcs.ICALP.2016.142
Reservation Exchange Markets for Internet Advertising

Authors: Gagan Goel, Stefano Leonardi, Vahab Mirrokni, Afshin Nikzad, and Renato Paes-Leme

Published in: LIPIcs, Volume 55, 43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)

Abstract
Internet display advertising industry follows two main business models. One model is based on direct deals between publishers and advertisers where they sign legal contracts containing terms of fulfillment for a future inventory. The second model is a spot market based on auctioning page views in real-time on advertising exchange (AdX) platforms such as DoubleClick's Ad Exchange, RightMedia, or AppNexus. These exchanges play the role of intermediaries who sell items (e.g. page-views) on behalf of a seller (e.g. a publisher) to buyers (e.g., advertisers) on the opposite side of the market. The computational and economics issues arising in this second model have been extensively investigated in recent times. In this work, we consider a third emerging model called reservation exchange market. A reservation exchange is a two-sided market between buyer orders for blocks of advertisers' impressions and seller orders for blocks of publishers' page views. The goal is to match seller orders to buyer orders while providing the right incentives to both sides. In this work we first describe the important features of mechanisms for efficient reservation exchange markets. We then address the algorithmic problems of designing revenue sharing schemes to provide a fair division between sellers of the revenue collected from buyers. A major conceptual contribution of this work is in showing that even though both clinching ascending auctions and VCG mechanisms achieve the same outcome from a buyer perspective, however, from the perspective of revenue sharing among sellers, clinching ascending auctions are much more informative than VCG auctions.
Cite as

Gagan Goel, Stefano Leonardi, Vahab Mirrokni, Afshin Nikzad, and Renato Paes-Leme. Reservation Exchange Markets for Internet Advertising. In 43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 55, pp. 142:1-142:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{goel_et_al:LIPIcs.ICALP.2016.142,
  author =	{Goel, Gagan and Leonardi, Stefano and Mirrokni, Vahab and Nikzad, Afshin and Paes-Leme, Renato},
  title =	{{Reservation Exchange Markets for Internet Advertising}},
  booktitle =	{43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)},
  pages =	{142:1--142:13},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-013-2},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{55},
  editor =	{Chatzigiannakis, Ioannis and Mitzenmacher, Michael and Rabani, Yuval and Sangiorgi, Davide},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2016.142},
  URN =		{urn:nbn:de:0030-drops-62863},
  doi =		{10.4230/LIPIcs.ICALP.2016.142},
  annote =	{Keywords: Reservation Markets, Internet Advertising, Two-sided Markets, Clinching Auction, Envy-free allocations}
}
Document
DOI: 10.4230/LIPIcs.APPROX-RANDOM.2014.209
Deliver or hold: Approximation Algorithms for the Periodic Inventory Routing Problem

Authors: Takuro Fukunaga, Afshin Nikzad, and R. Ravi

Published in: LIPIcs, Volume 28, Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2014)

Abstract
The inventory routing problem involves trading off inventory holding costs at client locations with vehicle routing costs to deliver frequently from a single central depot to meet deterministic client demands over a finite planing horizon. In this paper, we consider periodic solutions that visit clients in one of several specified frequencies, and focus on the case when the frequencies of visiting nodes are nested. We give the first constant-factor approximation algorithms for designing optimum nested periodic schedules for the problem with no limit on vehicle capacities by simple reductions to prize-collecting network design problems. For instance, we present a 2.55-approximation algorithm for the minimum-cost nested periodic schedule where the vehicle routes are modeled as minimum Steiner trees. We also show a general reduction from the capacitated problem where all vehicles have the same capacity to the uncapacitated version with a slight loss in performance. This reduction gives a 4.55-approximation for the capacitated problem. In addition, we prove several structural results relating the values of optimal policies of various types.
Cite as

Takuro Fukunaga, Afshin Nikzad, and R. Ravi. Deliver or hold: Approximation Algorithms for the Periodic Inventory Routing Problem. In Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2014). Leibniz International Proceedings in Informatics (LIPIcs), Volume 28, pp. 209-225, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@InProceedings{fukunaga_et_al:LIPIcs.APPROX-RANDOM.2014.209,
  author =	{Fukunaga, Takuro and Nikzad, Afshin and Ravi, R.},
  title =	{{Deliver or hold: Approximation Algorithms for the Periodic Inventory Routing Problem}},
  booktitle =	{Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2014)},
  pages =	{209--225},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-74-3},
  ISSN =	{1868-8969},
  year =	{2014},
  volume =	{28},
  editor =	{Jansen, Klaus and Rolim, Jos\'{e} and Devanur, Nikhil R. and Moore, Cristopher},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.APPROX-RANDOM.2014.209},
  URN =		{urn:nbn:de:0030-drops-46985},
  doi =		{10.4230/LIPIcs.APPROX-RANDOM.2014.209},
  annote =	{Keywords: Inventry Routing Problem, Approximation algorithm, Prize-collecting Steiner Tree}
}
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