Blar i Bergen Open Research Archive på forfatter "Hemmati, Ahmad"
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An adaptive heuristic for Feeder Network Design with optional transshipment
Bergmann, Morten; Msakni, Mohamed Kais; Hemmati, Ahmad; Fagerholt, Kjetil (Journal article; Peer reviewed, 2023)This paper studies the Feeder Network Design Problem (FNDP), which considers the design of a minimum cost liner shipping network for the transportation of cargo (containers) between a given hub port and a set of feeder ... -
An ALNS-based matheuristic algorithm for a multi-product many-to-many maritime inventory routing problem
Heidari, Nooshin; Hemmati, Ahmad (Journal article; Peer reviewed, 2023)In this paper, we propose an adaptive large neighborhood search-based matheuristic algorithm to solve a multi-product many-to-many maritime inventory routing problem. The problem addresses a short sea inventory routing ... -
Covering tour problem with varying coverage: Application to marine environmental monitoring
Torabi, Parisa; Oleynik, Anna; Hemmati, Ahmad; Alendal, Guttorm (Journal article; Peer reviewed, 2023)In this paper, we present a novel variant of the Covering Tour Problem (CTP), called the Covering Tour Problem with Varying Coverage (CTP-VC). We consider a simple graph 𝐺 = (𝑉 ,𝐸), with a measure of importance assigned ... -
Enabling same-day delivery using a drone resupply model with transshipment points
Moshref-Javadi, Mohammad; Van Cauwenberghe, Kristof P.; McCunney, Brent A.; Hemmati, Ahmad (Journal article; Peer reviewed, 2023)We study a hybrid logistics delivery model which incorporates trucks and drones. In this model, named the Drone Resupply Model with Transshipment Points (DRMTP), drones are used to resupply transshipment points where trucks ... -
A general deep reinforcement learning hyperheuristic framework for solving combinatorial optimization problems
Kallestad, Jakob Vigerust; Hasibi, Ramin; Hemmati, Ahmad; Sörensen, Kenneth (Journal article; Peer reviewed, 2023)Many problem-specific heuristic frameworks have been developed to solve combinatorial optimization problems, but these frameworks do not generalize well to other problem domains. Metaheuristic frameworks aim to be more ... -
Solving a pickup and delivery routing problem for fourth-party logistics providers
Johannessen, Preben Bucher; Hemmati, Ahmad; Moshref-Javadi, Mohammad (Journal article; Peer reviewed, 2022)This paper studies a pickup and delivery routing problem for fourth-party logistics providers. The problem aims to schedule routes of vehicles to pick up orders from suppliers and deliver them to factory locations considering ...