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Joseph, G. (author)The convergence of expectation-maximization (EM)-based algorithms typically requires continuity of the likelihood function with respect to all the unknown parameters (optimization variables). The requirement is not met when parameters comprise both discrete and continuous variables, making the convergence analysis nontrivial. This paper...journal article 2024
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Bijl, Jorn (author)Green hydrogen plays an important role in the energy transition. It can function as a storage medium, as well as a replacement for fossil fuels in transport or high-temperature heat processes. However, the economic feasibility of electrolysers has proved to be a problem. Even though a lot of research has been done to the electrolysis technology,...master thesis 2023
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Manoj Philip, Adhil (author)The purpose of this graduation thesis entitled "Probabilistic restructuring of complex construction project activity linking using GERT: an alternate network distribution in mitigation controller" is to analyse the effect of project network structures when the duration of the project activities is distributed stochastically and its following...master thesis 2022
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Bard, Apolline (author)An increasing part of European electricity is provided by renewable sources, whose output varies considerably. In order to offset these variations, gas can be used as an auxiliary source of energy for power production, but extra power can also be used to produce hydrogen or methane for storage. As a consequence, gas and power networks are...master thesis 2022
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Ding, Wenlong (author), Wang, Y. (author), Chu, Pengzi (author), Chen, Feng (author), Song, Yongchao (author), Zhang, Ning (author), Lin, Dong (author)The rapid development of the economy has promoted the growth of freight transportation. The truck service areas on expressways, as the main places for truck drivers to rest, play an important role in ensuring the driving safety of trucks. If these service areas are constructed densely or provide a plentiful supply of parking areas, they are...journal article 2022
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Mitici, M.A. (author), Ramos Pereira, M. (author), Oliviero, F. (author)With the current advances in aircraft design and Lithium-Ion batteries, electric aircraft are expected to serve as a replacement for conventional, short-range aircraft. This paper addresses the main operational challenges for short-range flights operated with electric aircraft: determining the investment needs for a fleet of electric aircraft,...journal article 2022
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Wei, Zhang (author), Roos, C. (author)We introduce a new variant of Chubanov's method for solving linear homogeneous systems with positive variables. In the Basic Procedure we use a recently introduced cut in combination with Nemirovski's Mirror-Prox method. We show that the cut requires at most (Formula presented.) time, just as Chubanov's cut. In an earlier paper it was shown...journal article 2022
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Brunelli, Matteo (author), Rezaei, J. (author)This communication examines the best–worst method for multi-criteria decision making from a more mathematical perspective. The central part of this manuscript is the introduction of a new metric into the framework of the best–worst method. This alternative metric does not change the original idea behind the best–worst method and yet it can be...journal article 2019
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Stassen, Misha (author)Melvin Dresher beschouwde in zijn boek uit 1961 over speltheorie een getallenraadspel over N getallen. Hij liet zien hoe de optimale strategieën van beide spelers kon worden gevonden met behulp van lineair programmeren. Later toonde Selmer Johnson oplossingen voor N<=11 en merkte op dat de berekeningen steeds complexer werden bij toenemende N...bachelor thesis 2018
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Mouri Sardarabadi, A. (author), van der Veen, A.J. (author), Koopmans, Leon V.E. (author)Having an accurate calibration method is crucial for any scientific research done by a radio telescope. The next generation radio telescopes such as the Square Kilometre Array (SKA) will have a large number of receivers which will produce exabytes of data per day. In this paper we propose new direction-dependent and independent calibration...conference paper 2018
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Mouri Sardarabadi, A. (author), van der Veen, A.J. (author), Koopmans, L.V.E. (author)For subspace estimation with an unknown colored noise, Factor Analysis (FA) and its extensions, denoted as Extended FA (EFA), are good candidates for replacing the popular eigenvalue decomposition (EVD). Finding the unknowns in (E)FA can be done by solving a non-linear least square problem. For this type of optimization problems, the Gauss...conference paper 2018
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Zuiderveen Borgesius, Freek (author)To limit global warming to 2 degrees Celsius in 2100, the European power sector needs to transform. Renewable energy capacity is required to reach this ambition, together with transmission and storage capacity to maintain grid stability. Carbon capture and storage could potentially decrease the required renewable energy capacity, while...master thesis 2017
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Çetinay Iyicil, H. (author), Kuipers, F.A. (author), Guven, A. Nezih (author)In this paper, we propose a novel technique to determine the optimal placement of wind farms, thereby taking into account wind characteristics and electrical grid constraints. We model the long-term variability of wind speed using a Weibull distribution according to wind direction intervals, and formulate the metrics that capture wind speed...journal article 2017
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Asadi, A.R. (author), Roos, C. (author)In this paper, we design a class of infeasible interior-point methods for linear optimization based on large neighborhood. The algorithm is inspired by a full-Newton step infeasible algorithm with a linear convergence rate in problem dimension that was recently proposed by the second author. Unfortunately, despite its good numerical behavior,...journal article 2015
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Nugroho, H. (author)Optical beamforming networks (OBFNs), which consist of many small and flat antennas, called phased array antennas (PAAs), can be tuned such that the signal beam from the airplanes can be steered towards a satellite. This was proposed as a alternative to the mechanically steered antenna, which has many disadvantages. The problem of tuning a large...master thesis 2015
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Roos, C. (author)We present an improved version of an infeasible interior-point method for linear optimization published in 2006. In the earlier version each iteration consisted of one so-called feasibility step and a few---at most three---centering steps. In this paper each iteration consists of only a feasibility step, whereas the iteration bound improves the...journal article 2015
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Matienzo Carcases, Y. (author)Article: Quantitative modeling approaches to support strategic workforce planning Workforce planning is an activity performed by organizations to ensure that investments in human capital lead to effective achievement of organizational goals. At a strategic level, it tries to proactively design strategies to reduce gaps between demand and supply...master thesis 2013
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- Bijl, J. (author) master thesis 2012
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Asadi, A. (author)Recently, C. Roos proposed a full-Newton step infeasible interior-point method (IIPM) for linear optimization (LO). Shortly afterwards, Mansouri and Roos presented a variant of this algorithm and Gu et al. a version with a simplified analysis. Roos' algorithm is a path-following method. It uses the so-called homotopy path as a guideline to an...doctoral thesis 2011
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Gu, G. (author), Roos, C. (author)In [SIAM J. Optim., 16 (2006), pp. 1110–1136], Roos proved that the devised full-step infeasible algorithm has $O(n)$ worst-case iteration complexity. This complexity bound depends linearly on a parameter $\bar{\kappa}(\zeta)$, which is proved to be less than $\sqrt{2n}$. Based on extensive computational evidence (hundreds of thousands of...journal article 2010
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