On October 13th (Tuesday) and 14th (Wednesday), we will host our second yearly seminar at École des Ponts. This will be a great opportunity to present our latest contributions and discuss with various stakeholders.
All the meetings will take place in the main building of École des Ponts, Belgrand wing, room B202. They are invitation-only.
Tuesday afternoon (14h-18h)
This time will be dedicated to an exchange with ACME’s industrial partners. Tentative agenda:
The ample time allotted to questions is designed to gather feedback and solidify future research directions.
Thursday evening (19h)
Team dinner at Le Trois Quatorze, restaurant of Hotel Ibis Marne-la-Vallée Champs.
Wednesday morning (9h-12h)
This time will be dedicated to scientific brainstorming between the members of the project, possibly featuring talks by colleagues or senior researchers working on related subjects.
Wednesday lunch (12h-14h)
Team lunch at the cafeteria of ENPC.
Wednesday afternoon (14h-17h)
This time will be dedicated to a (partially remote) meeting with Agence Nationale de la Recherche. Tentative agenda:
The presentations will be similar to those given to the industrial partners, but shorter.
The following talks will be given by ACME members during the seminar.
Mohammed Younes (PhD student): A Knowledge Graph-Based Framework for Interoperable Supply-Chain Data Ecosystems
Cross-actor freight coordination depends on records held in independently managed information systems whose schemas, identifiers, validation assumptions, provenance, versions, and access conditions differ. This paper presents the approach and planned methodology of a PhD project investigating whether a bounded knowledge-graph layer can make selected records jointly queryable while making the represented conditions for qualifying an answer explicit and checkable. A service-fulfilment scenario is specified through competency questions; relevant source fragments are mapped to a scenario vocabulary and represented in a version-pinned graph. Query evaluation returns candidate answers. For each candidate, the system records one selected derivation and evaluates a requester-specific integration profile using this support and the declared evidence context, returning pass, fail, or undetermined with component-level diagnostics. The planned evaluation separates the effect of semantic integration on candidate retrieval from the effect of profile-based qualification on qualification correctness, diagnostic localisation, and traceability.
Nicolas Bessin (PhD student): Pricing for a Last-Mile Delivery Pooling Service
In the fresh-food supply chain—specifically at the Rungis food market, multiple suppliers each sell a different type of goods (meat; fish; and fruits and vegetables). Each must independently perform deliveries to their own set of clients, and there is heavy overlap between these sets of clients, most of them being located in close proximity to each other. This independent routing leads to two types of inefficiencies: partially filled trucks and multiple visits to the same client. To alleviate this, Califrais aims to introduce a new actor to the system, called the “pooling operator”, that can take over some of the deliveries of the different suppliers and pool them, leading to better efficiency than what the suppliers can achieve on their own. We propose a new form of (vertical) collaborative routing model, where the pooling operator provides a “pooling service” that the suppliers can use to reduce their own routing costs. In our model, the pooling operator prices the service in advance and chooses daily how to operate the system. To make sure the different suppliers want to participate, the pooling operator must ensure that operating costs are reduced for suppliers who participate in the pooling scheme, while trying to maximize its own profit. Our main contribution lies in using a pooling model where the allocation of profits is done in advance rather than through the use of a posteriori reallocation of the profits, which is the more common approach in the literature. We formulate the model, provide bounds on the usefulness of pooling in simple cases, and state properties that will help us solve the model. Finally, we provide initial numerical results that demonstrate the viability of the proposed pooling system, based on a real-world data set from suppliers operating at the Rungis food market.
Joachim Eimery (PhD student): Horizontal collaboration for fret transportation
This presentation proposes a two-stage framework to support collaboration and negotiations among shippers for fret transportation. First, we adopt the perspective of a central planner and formulate a Scheduled Service Network Design Problem to determine a minimum-cost network satisfying all transportation requirements. Second, we investigate how the resulting cost can be allocated among coalition members. We use the Shapley value as a benchmark to account for each shipper’s marginal contributions to coalition costs. Since its exact computation requires solving an exponential number of network design problems, we examine approximation methods that reduce the computational burden.
Gabriel Legrand (MS student): Behavior of agents on the logistics market and incentives to cooperate
Abstract TBA