Blar i NTNU Open på forfatter "Andersson, Henrik"
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The Dynamic Electric Carsharing Relocation Problem
Hellem, Simen; Julsvoll, Carl Andreas; Moan, Magnus; Andersson, Henrik; Fagerholt, Kjetil; Pantuso, Giovanni (Peer reviewed; Journal article, 2021)This article addresses a relocation and recharging problem faced by modern carsharing operators who manage a fleet of electric vehicles. As customers utilize the fleet, batteries are depleted and vehicles are possibly left ... -
Emergency Department Layout Planning Using A Simulation And Optimization Approach
Berdal, Tore Bjørseth; Nydal, Erlend Moian (Master thesis, 2020)Flere faktorer påvirker hvordan et akuttmottak fungerer, blant annet dyktige ansatte, tilstrekkelig kapasitet av ressurser og ansatte, fornuftig arbeidsfordeling samt gode planer for å håndtere kritiske situasjoner. Men, ... -
Exact and heuristic solution approaches for a routing problem found within snow plowing operations
Johansen, Magnus; Gundersen, Anders Holmen; Kjær, Benjamin Steffen (Master thesis, 2017)We consider both exact and heuristic solution approaches, which are described, implemented, and evaluated. Most effort is given to a column generation method and a hybrid genetic algorithm with diversity management. -
An exact solution method for the capacitated item-sharing and crowdshipping problem
Behrend, Moritz; Meisel, Frank; Fagerholt, Kjetil; Andersson, Henrik (Peer reviewed; Journal article, 2019)The item-sharing and crowdshipping problem combines two concepts of the sharing economy, namely item-sharing and crowdshipping. Item-sharing is about renting items among members of a sharing community. Crowdshipping addresses ... -
Global Optimisation of Multi-Plant Manganese Alloy Production
Digernes, Martin Naterstad; Rudi, Lars; Andersson, Henrik; Stålhane, Magnus; Wasbø, Stein O.; Knudsen, Brage Rugstad (Journal article; Peer reviewed, 2017)This paper studies the problem of multi-plant manganese alloy production. The problem consists of finding the optimal furnace feed of ores, fluxes, coke, and slag that yields output products which meet customer specifications, ... -
An improved formulation for the inventory routing problem with time-varying demands
Skålnes, Jørgen; Andersson, Henrik; Desaulniers, Guy; Stålhane, Magnus (Journal article; Peer reviewed, 2022)The Inventory Routing Problem (IRP) is a broad class of complex routing problems where the quanti- ties of delivered products must also be determined. In this paper, we consider the classic IRP where a single supplier must ... -
Improving the Robustness of Nurse Schedules in a Real-Life Instance - a Quantitative Analysis Based on Simulation and Rescheduling Under Uncertainty
Melby, Line Maria Haugen; Løyning, Isabel Nordli (Master thesis, 2018)Nurse schedules are subject to uncertainties in both the demand and supply of nurses, which often change on a daily basis. The demand depends on the number and severity of the patients admitted, while the supply depends ... -
Incorporating Neighborhood Interactions and Vehicle Coordination in Bike Sharing Rebalancing with the X-PILOT Method
Inngjerdingen, Christian Håkon Torsten; Møller, Simen Aksland (Master thesis, 2023)Denne oppgaven undersøker effekten av nabolagsinteraksjoner og koordinering av servicebiler i bysykkelsystemer (BSS). På grunn av ujevn fordeling av etterspørselen mellom stasjonene i BSS, er det en betydelig utfordring ... -
Industrial Aspects and Literature Survey: Combined Inventory Management and Routing
Andersson, Henrik; Hoff, Arild; Christiansen, Marielle; Hasle, Geir; Løkketangen, Arne (Research report, 2008)This paper describes industrial aspects of combined inventory management and routing, and gives a comprehensive literature review of the current state of the research. First there is a classification of types of supply ... -
Industrial Aspects and Literature Survey: Fleet Composition and Routing
Hoff, Arild; Andersson, Henrik; Christiansen, Marielle; Hasle, Geir; Løkketangen, Arne (Research report, 2008)The purpose of this paper is to describe industrial aspects of combined fleet composition and routing in maritime and road-based transportation, and to present the current status of research in the form of a comprehensive ... -
Integrated master surgery and outpatient clinic scheduling
Bovim, Thomas; Abdullahu, Anita; Andersson, Henrik; Gullhav, Anders Nordby (Peer reviewed; Journal article, 2022)In this paper, we study an integrated master surgery and outpatient clinic scheduling problem, motivated by the situation at the Orthopaedic Department at St. Olav’s Hospital, Trondheim. During a treatment process, the ... -
Integrating Machine Learning Techniques in Real-Time Production Optimization
Andreassen, Rakel Sjaastad; Westby, Eline Myhrum (Master thesis, 2019)Denne avhandlingen undersøker hvordan å integrere maskinlæringsteknikker i sanntidsoptimering (RTO) i oppstrømssektoren i petroleumsproduksjonsindustrien. Hovedmålet med optimeringsproblemet er å maksimere oljeproduksjonen ... -
Investments in the LNG Value Chain: A Multistage Stochastic Optimization Model focusing on Floating Liquefaction Units
Røstad, Lars Dybsjord; Erichsen, Jeanette Christine (Master thesis, 2012)In this thesis, we have developed a strategic optimization model of investments in infrastructure in the LNG value chain. The focus is on floating LNG production units: when they are a viable solution and what value they ... -
An iterative matheuristic for the inventory routing problem
Vadseth, Simen Tung; Andersson, Henrik; Stålhane, Magnus (Peer reviewed; Journal article, 2021)The paper considers the inventory routing problem with the Maximum Level replenishment policy. Here, the supplier is in charge of replenishing goods to a number of customers and can decide when, and in what order, these ... -
Modelling and Optimization of Real-Time Petroleum Production - Using robust regression, bootstrapping, moment matching, and two-stage stochastic optimization
Morken, Marius Lie; Sandberg, Peter Tomassen (Master thesis, 2016)This work is concerned with the upstream sector of the petroleum industry and seeks to develop methods for real-time optimization of petroleum production under uncertainty. The real-time production optimization problem ... -
A multi-start route improving matheuristic for the production routing problem
Vadseth, Simen Tung; Andersson, Henrik; Stålhane, Magnus; Chitsaz, Masoud (Peer reviewed; Journal article, 2023)This paper considers the multi-vehicle production routeing problem with a maximum-level replenishment policy. This is a well-established problem within vendor managed inventory where production, inventory and routeing ... -
Navigating Urban Skies: A Novel Path Planning Approach for Systems of Drones
Erdal, Frida Johanne Kolstad; Pedersen, Katrine; Solberg, Mathilde Marie (Master thesis, 2023)Ubemannede luftfartøy (“unmanned aerial vehicles”, UAV) har mulighet til å endre samfunnets syn på tilgjengelighet. I løpet av det siste tiåret har UAVer, også kjent som droner, fått større og større interesse fra både ... -
Neural Network Assisted Large Neighborhood Search for Personnel Rostering
Langfeldt, Sigurd Sigurdsson; Langholm, Magnus Hauge; Spangelo, Tomas Haugland (Master thesis, 2022)Allokering av arbeidskraft er en essensiell oppgave hos mange organisasjoner som kan være både kompleks og tidkrevende. Til tross for dette er den dominerende praksisen å sette opp timeplaner manuelt. Vår industripartner, ... -
A new formulation for the liner shipping network design problem
Ameln, Marie; Fuglum, Julie Sand; Thun, Kristian; Andersson, Henrik; Stålhane, Magnus (Peer reviewed; Journal article, 2019)The liner shipping network design problem (LSNDP) is an important problem within liner shipping because a good network can reduce costs and increase profits. Given sets of ports, vessel classes, and demands between the ... -
New Mathematical Programming-based Algorithms for Solving Rich Vehicle Routing Problems
Vadseth, Simen Tung (Doctoral theses at NTNU;2023:370, Doctoral thesis, 2023)This thesis addresses rich vehicle routing problems (VRPs) and introduces innovative algorithms for solving them. VRPs are vital in logistics, optimizing routes for the delivery of goods. Rich VRPs which incorporate ...