Exploiting Symmetry in the Generation Expansion Planning Problem to Accelerate Crossover: Determining European Energy Investment Strategies Faster

Computational efficiency is essential for large-scale mathematical optimisation problems, such as the generation expansion planning problem, to be practically applicable. In linear programming solvers, crossover is frequently a bottleneck when solving optimisation problems. This study aims at determining why crossover is a bottleneck in solving...

Hypothesis Testing in Contingency Tables: A Discussion, and Exact Unconditional Tests for r×c Tables

Every time one counts the number of occurrences of a pair of values for two categorical variables, one obtains a contingency table. These tables are one of the simplest representations of data in order to statistically test for the presence of some association between the two variables under consideration. Although naturally occurring in so many...

Traffic Routing under Dynamic Network Topologies

Inefficient road usage in a traffic network context – i.e. over-saturation on one route, where other roads are still available – is an important problem. It appears often and in different types of situations. We concentrate on congestion caused by predicted temporary road blockades, such as open bridges. This research aims to reduce such...

Robust Flight-to-Gate Assignment Planning with Airside and Landside Constraints: an Amsterdam Airport Schiphol Case Study

The Flight-to-Gate Assignment Problem (FGAP) covers the optimal assignment of flights, or rather the aircraft serving these flights, to the available aircraft stands. Existing FGAP models in literature do not consider airside and landside processes simultaneously. We propose a FGAP model with three specifications, where only airside constraints...

Improved Flexible Runway Use Modeling: A Multi-Objective Optimization Concerning Pairwise RECAT-EU Separation Minima, Reduced Noise Annoyance and Fuel Consumption at London Heathrow

A minimization of disturbance caused by aircraft noise events and a reduction of fuel consumption during the initial and final phase of flight. These are the two objectives that play an important role in the Flexible Runway Allocation Model. By taking into account fuel consumption alongside noise annoyance, this model enables to analyze and...

Optimization of a passenger railway transportation plan considering mobility flows and service quality

This research focuses on designing transportation plan for SNCF Transilien (French rail-way operator for the Parisian suburban mass transit). The objective is to develop methods and decision support tools to propose a timetable adapted to the passenger demand in the Parisian mass transit system, including comfort and reliability criterias.<br/...

Optimal Placement and Sizing of Distributed Generation

In this thesis work we solve the problem of optimal placement and sizing of distributed generation by using an original Fuzzy Adaptive Particle Swarm Optimization algorithm and a Mixed Integer Linear Programming formulation of the problem. The goal of integrating Fuzzy Logic in Particle Swarm Optimization is to be able to overcome some of the...