Alexander Eckl (TUM, AdONE): "Minimization of Weighted Completion Times in Path-based Coflow Scheduling" – Coflow scheduling models communication requests in parallel computing frameworks where multiple data flows between shared resources need to be completed before computation can continue. We introduce Path-based Coflow Scheduling, a generalized problem variant that considers coflows as collections of flows along fixed paths on general network topologies… [read more]

Alexandre Forel (TUM, AdONE): "Dynamic stochastic lot-sizing with forecast evolution" – Uncertainty of demand forecasts is a major difficulty in determining efficient production plans. In practice, it is common to work in a rolling horizon fashion, periodically updating the demand forecast and production plan. Although demand uncertainty is well-studied in the production planning literature, the considerations of stochastic forecast evolution are rare. In… [read more]

Alexandros Tsigonias-Dimitriadis (TUM, AdONE): "On Prophets and Secretaries with Binomial Sampling" – Suppose that we want to pick the maximum value of a sequence of n elements and the only information that we have is the cardinality n. The elements, after an adversary assigns (non-negative) values to them, start arriving one by one in a uniformly random order. Upon each arrival, we need to make an immediate and irrevocable decision of whether to accept an… [read more]

We invite interested PhD students to apply for the summer school on "Digital Transformation of Mobility Systems – Operations Research Models and Methods". The summer school will take place from July 27th-31st 2020 at the Heilbronn-campus of the Technical University of Munich. [read more]

Prof. Dr. Dirk Briskorn (University of Wuppertal): "Grantry Crane Scheduling in Seaports" – This presentation outlines typical setups of rail-mounted gantry cranes handling containers in a seaport terminal and formalizes scheduling problems. Regarding solution methods we, first, focus on a subproblem, a corresponding graphical model, and efficient solution methods and, afterwards, show how these can be employed in algorithmic frameworks to tackle the… [read more]

Prof. Alexander Hübner (TUM): "Food Supply Chain Management" – This presentation gives an overview of challenges in food supply chain management. Furthermore, it addresses the vehicle routing and delivery frequency problem in grocery distribution. As most grocery retailers nowadays operate their own logistics network with own distribution networks, efficient distribution planning is essential in order to stay competitive in this environment. More… [read more]

Prof. Teodor Gabriel Crainic (Université du Québec à Montréal): "Service Network Design and Planning Two-tier City Logistics Systems" – Freight transportation and logistics are vital for the economy in general and cities in particular. They also yield a number of negative impacts in terms of congestion, pollution, safety, etc. City Logistics proposes new concepts and operational and business models to alleviate these negative impacts and foster an… [read more]

Prof. Haldun Aytug (University of Florida): "Bidding in Keyword Auctions" – We study keyword auctions, and formulate an advertiser's bidding problem as a profit maximization problem in which the advertiser has to decide on how much to bid on each keyword. We consider models with budget and time constraints, as well as those when constraints are relaxed. We assume the advertiser can observe only her bid, her rank, the search frequency and the click… [read more]

Prof. Stefan Helber (Leibniz-Universität Hannover): "Pros and cons of service level metrics for stochastic lot sizing models" – Lot sizing decisions in a manufacturing context are often made for multiple products over multiple discrete periods. Very often, the different products compete for scarce production resources. When those decisions are made, the demand for the products is often uncertain, e.g., as it stems from the application of a forecasting… [read more]

Prof. Nils Boysen (Friedrich-Schiller-Universität Jena): "E-commerce warehousing: Order fulfillment in modern retailing" – This talk addresses suited warehousing systems and important optimization problems in modern e-commerce retailing. E-commerce mainly processes low-volume-high-mix picking orders, because private households tend to order just a few pieces per order from a large assortment. This talk gives an overview on suited warehousing systems, which… [read more]