Browsing NTNU Open by Author "Wang, Xin"
Now showing items 1-18 of 18
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A genetic search-based heuristic for a fleet size and periodic routing problem with application to offshore supply planning
Borthen, Thomas; Loennechen, Henrik; Wang, Xin; Fagerholt, Kjetil; Vidal, Thibaut (Journal article; Peer reviewed, 2017)This paper introduces a genetic search-based heuristic to solve an offshore supply vessel planning problem (SVPP) faced by the Norwegian oil and gas company Statoil. The aim is to help the company in determining the optimal ... -
A Traveling Salesman Problem with Pickups and Deliveries and Stochastic Travel Times: An Application from Chemical Shipping
Elgesem, Aurora Smith; Skogen, Eline Sophie; Wang, Xin; Fagerholt, Kjetil (Journal article; Peer reviewed, 2018)This paper introduces a single-ship routing problem with stochastic travel times that is faced by a chemical shipping company in the Port of Houston. We take into explicit consideration the uncertain waiting times associated ... -
A two-phase heuristic for an in-port ship routing problem with tank allocation
Wang, Xin; Arnesen, Mari Jevne; Fagerholt, Kjetil; Gjestvang, Magnhild; Thun, Kristian (Journal article; Peer reviewed, 2017)This paper addresses an in-port ship routing problem with tank allocation that arises in the chemical shipping industry. The aim is to optimize a tanker’s port call operation that integrates sequencing decisions for visiting ... -
Bi-objective offshore supply vessel planning with costs and persistence objectives
Borthen, Thomas; Loennechen, Henrik; Fagerholt, Kjetil; Wang, Xin; Vidal, Thibault (Journal article; Peer reviewed, 2019)This paper introduces a bi-objective model for the offshore supply vessel planning problem (SVPP) in the oil & gas industry. The SVPP consists of determining a new weekly plan for sailing the platform supply vessels whenever ... -
Breathable Nanowood Biofilms as Guiding Layer for Green On‐Skin Electronics
Zhou, Tianle; Wang, jinwen; Huang, Ming; An, Rong; Tan, Huaping; Wei, Hao; Chen, Zheng-Dong; Wang, Xin; Liu, Xiaoheng; Wang, Feng; He, Jianying (Journal article; Peer reviewed, 2019)Thin‐film electronics are urged to be directly laminated onto human skin for reliable, sensitive biosensing together with feedback transdermal therapy, their self‐power supply using the thermoelectric and moisture‐induced‐electric ... -
Controlling Risk in Maritime Fleet Renewal - A Stochastic Programming Approach
Skålnes, Jørgen (Master thesis, 2017)This thesis considers the Maritime Fleet Renewal Problem (MFRP) including the risk of insolvency. The MFRP is a strategic problem with a planning horizon of several years. The literature review shows that relatively little ... -
Developing a Forecast-Based Optimization Model for Fantasy Premier League
Kristiansen, Bjørn Kåre; Gupta, Akash; Eilertsen, William (Master thesis, 2018)Fantasy Premier League is an online game where participants assemble imaginary teams consisting of real-life football players competing in the top tier of English football, the Premier League. Participants gain points ... -
Green Tramp Shipping Routing and Scheduling: Effects of Market-Based Measures on CO2 Reduction
Wang, Xin; Norstad, Inge; Fagerholt, Kjetil; Christiansen, Marielle (Chapter, 2019)In this chapter we examine, from a tramp ship operator’s point of view, how potential CO2 emission reduction measures impact the operational decisions and their economic and environmental consequences. Two market-based ... -
Integrated maritime fuel management with stochastic fuel prices and new emission regulations
Gu, Yewen; Wallace, Stein W.; Wang, Xin (Journal article; Peer reviewed, 2018)Maritime fuel management (MFM) controls the procurement and consumption of the fuels used on board and therefore manages one of the most important cost drivers in the shipping industry. At the operational level, a shipping ... -
Maritime fleet deployment with speed optimization and voyage separation requirements
Borander, Venke; Straume, Anders; Dong, Bo; Fagerholt, Kjetil; Wang, Xin (Journal article; Peer reviewed, 2018)A shipping company operates a heterogeneous fleet of ships to service a given number of voyages on a number of trade routes over the planning horizon. Each ship has a predefined speed range within which it can sail. Fuel ... -
Modelling Approaches for Maritime Fleet Deployment with Speed Optimization and Voyage Separation Requirements
Borander, Venke; Straume, Anders (Master thesis, 2018)This thesis studies the fleet deployment problem within the liner shipping segment of the shipping industry. A shipping company has a predefined set of intercontinental trade routes, and serves numerous voyages on each ... -
Planning for charters: A stochastic maritime fleet composition and deployment problem
Wang, Xin; Fagerholt, Kjetil; Wallace, Stein W. (Journal article; Peer reviewed, 2017)This paper introduces a chartering problem that arises in the shipping industry. The chartering decisions determine the time-charter contracts to enter into, in particular, how many ships of each type to charter in, and ... -
Risk Control in Maritime Shipping Investments
Skålnes, Jørgen; Fagerholt, Kjetil; Pantuso, Giovanni; Wang, Xin (Journal article; Peer reviewed, 2019)In this paper we extend the state-of-the-art stochastic programming models for the Maritime Fleet Renewal Problem (MFRP) to explicitly limit the risk of insolvency due to negative cash flows when making maritime shipping ... -
Ship Traffic Scheduling and Disruption Management for the Kiel Canal - A Simulation-Optimization Approach
Skjæveland, Guro; Hilstad, Knut Viljar (Master thesis, 2018)The Kiel Canal is a nearly 100 km long artificial waterway that connects the North Sea and the Baltic Sea through the north of Germany. The canal alternates between wide and narrow segments, and on the narrow segments the ... -
Stochastic In-Port Routing in Chemical Shipping
Skogen, Eline Sophie; Elgesem, Aurora Smith (Master thesis, 2016)Chemical tankers spend a substantial amount of time in port as the development of port infrastructure has not followed the fast paced increase in the world fleet. The resulting traffic at terminals causes ships to wait for ... -
Stochastic Network Design for Planning Scheduled Transportation Services: The Value of Deterministic Solutions
Wang, Xin; Crainic, Teodor Gabriel; Wallace, Stein W. (Journal article; Peer reviewed, 2018)We study the value of deterministic solutions, in particular their quality and upgradability, in addressing stochastic network design problems, by analyzing their time-dependent formulations known as scheduled service ... -
The Impact of Bunker Risk Management on CO2 Emissions in Maritime Transportation Under ECA Regulation
Gu, Yewen; Wallace, Stein W.; Wang, Xin (Chapter, 2018)The shipping industry carries over 90% of the world’s trade, and is hence a major contributor to CO2 and other airborne emissions. As a global effort to reduce air pollution from ships, the implementation of the ECA (Emission ... -
The Multi-objective Supply Vessel Planning Problem - A Hybrid Genetic Search Approach
Borthen, Thomas; Loennechen, Henrik (Master thesis, 2016)The supply vessel planning problem (SVPP) is a problem faced by Statoil, the largest operator on the Norwegian continental shelf. Offshore installations need supplies from an onshore supply depot in order to operate, and ...