Browsing NTNU Open by Author "Christiansen, Marielle"
Now showing items 21-40 of 43
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Maritime crude oil transportation – A split pickup and split delivery problem
Hennig, Frank; Nygreen, Bjørn; Christiansen, Marielle; Fagerholt, Kjetil; Furman, Kevin C; Song, Jinhwa; Kocis, Gary R; Warrick, Philip H (Journal article; Peer reviewed, 2012)The maritime oil tanker routing and scheduling problem is known to the literature since before 1950. In the presented problem, oil tankers transport crude oil from supply points to demand locations around the globe. The ... -
Maritime fleet deployment in ro-ro shipping under inventory constraints
Chandra, Saurabh; Fagerholt, Kjetil; Christiansen, Marielle (Journal article; Peer reviewed, 2015)We present a tactical maritime fleet deployment problem in roll-on roll-off (ro-ro) liner shipping scenario, which deals with optimally assigning planned voyages to the available vessels in a fleet to determine the routing ... -
A MIP based local search heuristic for a stochastic maritime inventory routing problem
Agra, Agostinho; Christiansen, Marielle; Hvattum, Lars Magnus; Rodrigues, Filipe (Chapter, 2016)We consider a single product maritime inventory routing problem in which the production and consumption rates are constant over the planning horizon. The problem involves a heterogeneous fleet of ships and multiple production ... -
Mixed integer formulatins for a short sea fuel oil distribution problem
Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino (Journal article; Peer reviewed, 2013)We consider a short sea fuel oil distribution problem occurring in the archipelago at Cape Verde. Here, an oil company is responsible for the routing and scheduling of ships between the islands such that the demand for ... -
Novel Optimization Models for Complex Planning Problems in Maritime Transportation
Dong, Bo (Doctoral theses at NTNU;2020:370, Doctoral thesis, 2020)The purpose of this PhD thesis is to develop novel optimization models and formulations for three important planning problems in maritime transportation. Application of the operations research methods in the thesis can ... -
Operational planning for routes and schedules for a fleet of fuel supply vessels
Christiansen, Marielle; Fagerholt, Kjetil; Rachaniotis, Nikos; Stålhane, Magnus (Journal article; Peer reviewed, 2017)This paper considers a real operational problem of routing and scheduling a fleet of fuel supply vessels used to service customer ships anchored outside a major port. The problem can be formulated as a rich multi-trip ... -
Optimal lagerstyring av kontanter i minibanker med usikker etterspørsel
Bakken, Geir Martin; Wiik, Michael (Master thesis, 2014)Lønnsomheten av norske bankers drift av minibanker er redusert de siste årene. Dette som en konsekvens av blant annet en kraftig økning av korttransaksjoner og dertil nedgang i kontantuttak fra minibanker. Redusert lønnsomhet ... -
Optimisation-Based Nurse Scheduling for Real-Life Instances
Beckmann, Francesco R; Klyve, Kjartan Kastet (Master thesis, 2016)In this master s thesis we present a planning problem at Maternity Ward West (MWW) at St. Olavs Hospital, concerning the scheduling of 69 employees for a planning horizon of 27 weeks. The scheduling problem involves covering ... -
Optimization of a Supply Vessel Scheduling and Fuel Type Allocation Problem for a Hellenic Oil Company
Overdal, Marte Viktoria; Tveit, Ingeborg (Master thesis, 2013)This master thesis is concerned with solving a combined fuel supply vessel scheduling and fuel type allocation problem. The problem is provided by a Hellenic oil company. The company has a small, fixed fleet of fuel supply ... -
Optimization of combined ship routing and inventory management in the salmon farming industry
Solhaug, Ida Elise; Ivarsøy, Kristine S. (Master thesis, 2014)Fish feed is the largest component of a salmon farmer s production costs and lostfeed days are a large cost driver. Norway s largest salmon farmer, Marine HarvestNorway, hopes to cut costs and increase reliability of feed ... -
Optimizing Jack-up Vessel Chartering Strategies for Offshore Wind Farms
Mikkelsen, Andreas Jebsen; Kirkeby, Odin (Master thesis, 2016)Offshore wind energy is an industry in rapid growth. However, it is still outperformed by conventional sources of energy in terms of costs. One way to cut costs is to make operations and maintenance (O&M) more efficient; ... -
Optimizing Jack-up vessel strategies for maintaining offshore wind farms
Stålhane, Magnus; Christiansen, Marielle; Kirkeby, Odin; Mikkelsen, Andreas Jebsen (Journal article; Peer reviewed, 2017)In this paper we present a new two-stage stochastic mathematical programming model that determines the optimal jack-up vessel strategy for an offshore wind farm. Given an offshore wind farm site, and distance to shore the ... -
Personnel Planning in Health Care: Optimization of Nurse and Physician Rosters with real-life applications
Klyve, Kjartan Kastet (Doctoral theses at NTNU;2021:344, Doctoral thesis, 2021)Personnel rostering is challenging in multiple ways. Firstly, creating rosters is an inherently complex task from a combinatorial perspective. Secondly, as rosters reflect operations at a ward and affect the lives of staff, ... -
Robust Optimization for a Maritime Inventory Routing Problem
Agra, Agostinho; Christiansen, Marielle; Hvattum, Lars Magnus; Rodrigues, Filipe (Journal article; Peer reviewed, 2018)We consider a single product maritime inventory routing problem in which the production and consumption rates are constant over the planning horizon. The problem involves a heterogeneous fleet and multiple production and ... -
Ship routing and scheduling with speed optimization and voyage separation requirements
Norstad, Inge (Doctoral theses at NTNU;2017:43, Doctoral thesis, 2017)Summary of the thesis This PhD thesis discusses how operations research (OR) can be used to help ship operators with finding good solution for their tactical planning problems. The research has been a part of the larger ... -
Simulation Modelling and Analysis of the Time Planners' Problem - Scheduling Patients for MRI Examinations
Eilertsen, Anders Rogne; Selvaag, Hanna Mørreaunet (Master thesis, 2017)The goal of this thesis is to identify possible areas of improvement in the scheduling process for MRI appointments at St. Olavs University Hospital. Our attention has been on the time planning, as this is considered to ... -
Stochastic master surgery scheduling
Bovim, Thomas; Christiansen, Marielle; Gullhav, Anders Nordby; Range, Troels Martin; Hellemo, Lars (Journal article; Peer reviewed, 2020)The aim of the Master Surgery Scheduling Problem (MSSP) is to schedule the medical specialties to the different operating rooms available, such that surgeries may be performed efficiently. We consider a MSSP where elective ... -
Stochastic Master Surgery Scheduling for the orthopaedic department at St. Olav's Hospital
Bovim, Thomas Reiten (Master thesis, 2018)The regional health authority, Helse Midt-Norge (HMN), provides hospital services to the two counties Trøndelag and Møre og Romsdal. Forecasting estimates that the number of people living in these two counties that exceed ... -
Strategic ambulance location: optimization with multiple performance measures
Aartun, Eirik Nikolai; Leknes, Håkon (Master thesis, 2014)Emergency medical services (EMS) have been of interest for operations research since the middle of the 1960 s. Since then there have been published numerous articles on the location of ambulances stations, allocation of ... -
Strategic Maritime Preparedness Under Uncertainty - Using Sample Average Approximation to Locate Tugboats Along the Norwegian Coast
Musæus, Julie Louise; Nøstvik, Håkon Melby (Master thesis, 2017)The Norwegian Coastal Administration (NCA) is responsible for the maritime preparedness in Norwegian waters. By operating tugboats and monitoring the vessel traffic, the NCA aims to be well positioned against future drifting ...