Searched for: author:"Kooij, R.E."
(1 - 20 of 39)

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Sun, P. (author), He, Z. (author), Kooij, R.E. (author), Van Mieghem, P.F.A. (author)
Optical networks are vulnerable to failures due to targeted attacks or large-scale disasters. The recoverability of optical networks refers to the ability of an optical network to return to a desired performance level after suffering topological perturbations such as link failures. This paper proposes a general topological approach and...
journal article 2021
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Zegeling, André (author), Kooij, R.E. (author)
The research presented in this paper compares the occurrence of limit cycles under different bifurcation mechanisms in a simple system of two-dimensional autonomous predator–prey ODEs. Surprisingly two unconventional approaches, for a singular system and for a system with a center, turn out to produce more limit cycles than the traditional...
journal article 2021
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Kooij, R.E. (author), Dubbeldam, J.L.A. (author)
The linear relation between Kemeny's constant, a graph metric directly linked with random walks, and the effective graph resistance in a regular graph has been an incentive to calculate Kemeny's constant for various networks. In this paper we consider complete bipartite graphs, (generalized) windmill graphs and tree networks with large...
journal article 2020
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Pournaras, Evangelos (author), Taormina, R. (author), Thapa, Manish (author), Galelli, Stefano (author), Palleti, Venkata (author), Kooij, R.E. (author)
The manageability and resilience of critical infrastructures, such as power and water networks, is challenged by their increasing interdependence and interconnectivity. Power networks often experience cascading failures, i.e. blackouts, that have unprecedented economic and social impact. Al- though knowledge exists about how to control such...
journal article 2020
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Wang, X. (author), Kooij, R.E. (author), Moreno, Yamir (author), Van Mieghem, P.F.A. (author)
Networks are often made up of several layers that exhibit diverse degrees of interdependencies. An interdependent network consists of a set of graphs G that are interconnected through a weighted interconnection matrix B, where the weight of each intergraph link is a non-negative real number p. Various dynamical processes, such as...
journal article 2019
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Zegeling, A. (author), Kooij, R.E. (author)
In this paper we study the existence and uniqueness of limit cycles for so-called quadratic systems with a symmetrical solution: dx(t)/dt = P<sub>2</sub>(x, y) ≡ a<sub>00</sub>+ a<sub>10</sub>x + a<sub>01</sub>y + a<sub>20</sub>x<sup>2</sup>+ a<sub>11</sub>xy + a<sub>02</sub>y<sup>2</sup>dy(t)/dt = Q<sub>2</sub>(x, y) ≡ b<sub>00</sub>+ b<sub...
journal article 2018
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Rueda, Diego F. (author), Calle, Eusebi (author), Wang, X. (author), Kooij, R.E. (author)
Interconnection between telecommunication networks and other critical infrastructures is usually established through nodes that are spatially close, generating a geographical interdependency. Previous work has shown that in general, geographically interdependent networks are more robust with respect to cascading failures when the...
journal article 2018
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Wang, X. (author), Koc, Y. (author), Kooij, R.E. (author), Van Mieghem, P. (author)
Cascading failures are one of the main reasons for blackouts in electrical power grids. Stable power supply requires a robust design of the power grid topology. Currently, the impact of the grid structure on the grid robustness is mainly assessed by purely topological metrics, that fail to capture the fundamental properties of the electrical...
conference paper 2015
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Wang, X. (author), Koç, Y. (author), Derrible, S. (author), Nasir Ahmad, Sk. (author), Kooij, R.E. (author)
Metros (heavy rail transit systems) are integral parts of urban transportation systems. Failures in their operations can have serious impacts on urban mobility, and measuring their robustness is therefore critical. Moreover, as physical networks, metros can be viewed as network topological entities, and as such they possess measurable network...
conference paper 2015
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Koç, Y. (author), Warnier, M. (author), Van Mieghem, P. (author), Kooij, R.E. (author), Brazier, F.M.T. (author)
Cascading failures are one of the main reasons for large scale blackouts in power transmission grids. Secure electrical power supply requires, together with careful operation, a robust design of the electrical power grid topology. Currently, the impact of the topology on grid robustness is mainly assessed by purely topological approaches, that...
journal article 2014
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Van Kester, S. (author), Xiao, T. (author), Kooij, R.E. (author), Brunnstrom, K. (author), Ahmed, O.K. (author)
This paper studies the impact of freezing of video on quality as experienced by users. Two types of freezes are investigated. First a freeze where the image pauses, so no frames were lost (frame halt). In the second type of freeze, the image freezes and skips that part of the video (frame drop). Measuring Mean Opinion Score (MOS) was done by...
journal article 2011
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Wang, H. (author), Kooij, R.E. (author), Van Mieghem, P. (author)
We propose a class of graphs G?D(n1, n2, ..., nD+1), containing of a chain of D+1 cliques Kn1 , Kn2 , ..., KnD+1, where neighboring cliques are fully-interconnected. The class of graphs has diameter D and size N = ? 1?i?D+1ni. We prove that this class of graphs can achieve the maximal number of links, the minimum average hopcount, and more...
journal article 2010
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Kuipers, F.A. (author), Kooij, R.E. (author), de Vleeschauwer, D (author), Brunnstrom, K (author)
Quality of Experience (QoE) relates to how users perceive the quality of an application. To capture such a subjective measure, either by subjective tests or via objective tools, is an art on its own. Given the importance of measuring users¿ satisfaction to service providers, research on QoE took flight in recent years. In this paper we present...
conference paper 2010
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Brummelink, M.L. (author), Frantzeskaki, N. (author), Klaassen, R.G. (author), Blom, E.M. (author), Kooij, R.E. (author), Kroesen, J.O. (author), Stadler, D.I. (author), Van den Boogaard, M.E.D. (author)
Delft University of Technology (DUT) is becoming more and more an international community. Since lectures on master level are all conducted in English, the numbers of students from foreign countries attending DUT are rising and international cooperation within educational projects is a necessity. To prepare educators for the continuing...
conference paper 2009
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Kooij, R.E. (author), Klos, V.B. (author), Godana, B.E. (author), Nicolai, F.P. (author), Ahmed, O.K. (author)
Nowadays various digital television services are available. However, the user of these services experiences longer delays than the traditional analog TV while switching from channel to channel. The digital TV operator usually displays a black screen with the channel number during zapping. However, it could be interesting for the TV viewer, if...
journal article 2009
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Kooij, R.E. (author), Schumm, P. (author), Scoglio, C. (author), Youssef, M. (author)
The robustness of a network is depending on the type of attack we are considering. In this paper we focus on the spread of viruses on networks. It is common practice to use the epidemic threshold as a measure for robustness. Because the epidemic threshold is inversely proportional to the largest eigenvalue of the adjacency matrix, it seems easy...
conference paper 2009
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Omic, J.S. (author), Kooij, R.E. (author), Van Mieghem, P. (author)
We examine the influence of heterogeneous curing rates for a SIS model, used for malware spreading on the Internet, information dissemination in unreliable networks, and propagation of failures in networks. The topology structures considered are the regular graph which represents the homogenous network structures and the complete bi-partite...
conference paper 2009
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Godana, B.E. (author), Kooij, R.E. (author), Ahmed, O.K. (author)
Nowadays various digital television services are available. However, the user of these services experiences longer delays than the traditional analog TV while switching from channel to channel. The digital TV operator usually displays a black screen with the channel number during zapping. However, it could be interesting for the TV viewer, if...
conference paper 2009
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Kooij, R.E. (author), Nicolai, F. (author), Ahmed, O.K. (author), Brunnström, K. (author)
In an earlier paper we showed, that perceived quality of channel zapping is related to the perceived quality of download time of web browsing, as suggested by ITU-T Rec.G.1030. We showed this by performing subjective tests resulting in an excellent fit with a 0.99 correlation. This was what we call a lean forward experiment and gave the rule of...
conference paper 2009
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Lu, Y (author), Fallica, B (author), Kuipers, F.A. (author), Kooij, R.E. (author), Van Mieghem, P.F.A. (author)
journal article 2009
Searched for: author:"Kooij, R.E."
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