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Robustness of Network Controllability with Respect to Node Removals Based on In-Degree and Out-Degree

Wang, F. (author), Kooij, Robert (author)

Network controllability and its robustness have been widely studied. However, analytical methods to calculate network controllability with respect to node in- and out-degree targeted removals are currently lacking. This paper develops methods, based on generating functions for the in- and out-degree distributions, to approximate the minimum...

journal article 2023

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Recovering Power Grids Using Strategies Based on Network Metrics and Greedy Algorithms

Wang, F. (author), Cetinay, Hale (author), He, Zhidong (author), Liu, L. (author), Van Mieghem, P.F.A. (author), Kooij, Robert (author)

For this study, we investigated efficient strategies for the recovery of individual links in power grids governed by the direct current (DC) power flow model, under random link failures. Our primary objective was to explore the efficacy of recovering failed links based solely on topological network metrics. In total, we considered 13 recovery...

journal article 2023

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The recoverability of network controllability with respect to node additions

Wang, F. (author), Kooij, Robert (author)

Network controllability is a critical attribute of dynamic networked systems. Investigating methods to restore network controllability after network degradation is crucial for enhancing system resilience. In this study, we develop an analytical method based on degree distributions to estimate the minimum fraction of required driver nodes for...

journal article 2023

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Sustainable Assessment Tools for Higher Education Institutions: Developing Two-Hierarchy Tools for China

Du, Yawei Du (author), Ye, Qing (author), Liu, Hongjiang (author), Wu, Yuting (author), Wang, F. (author)

Higher Education Institutions (HEIs) play an increasingly significant role in the practice of sustainability. For HEIs in their early stages of sustainability, they are still in need of sustainable assessment tools (SATs) that are suitable for their local context and also lead international sustainable development. The purpose of this paper is...

journal article 2023

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Robustness of Network Controllability with Respect to Node Removals

Wang, F. (author), Kooij, Robert (author)

Network controllability and its robustness has been widely studied. However, analytical methods to calculate network controllability with respect to node removals are currently lacking. This paper develops methods, based upon generating functions for the in- and out-degree distributions, to approximate the minimum number of driver nodes...

conference paper 2023

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Controller Placement with Respect to Controller Reachability

Xu, Ran (author), Wang, F. (author), Kooij, Robert (author)

In this paper we investigate the controller placement problem on networks using controller reachability as the network performance metric. This metric is defined as the probability that each node can reach at least one controller, given that each link is operational with a fixed probability. By exploring placements for more than 100 real-world...

conference paper 2023

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Markov Modulated Process to Model Human Mobility

Chang, Brian (author), Yang, Liufei (author), Sensi, M. (author), Achterberg, M.A. (author), Wang, F. (author), Rinaldi, M. (author), Van Mieghem, P.F.A. (author)

We introduce a Markov Modulated Process (MMP) to describe human mobility. We represent the mobility process as a time-varying graph, where a link specifies a connection between two nodes (humans) at any discrete time step. Each state of the Markov chain encodes a certain modification to the original graph. We show that our MMP model...

conference paper 2022

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Removal of Hydrogen Peroxide Residuals and By-Product Bromate from Advanced Oxidation Processes by Granular Activated Carbon

Wang, F. (author), Zhang, Lu (author), Wei, L. (author), van der Hoek, J.P. (author)

During drinking water treatment, advanced oxidation process (AOP) with O3 and H2O2 may result in by-products, residual H2O2 and BrO3−. The water containing H2O2 and BrO3− often flows into subsequent granular activated carbon (GAC) filters. A concentrated H2O2 solution can be used as GAC modification reagent at 60 °C to improve its adsorption...

journal article 2021

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Direction of Arrival Estimation of Wideband Sources Using Sparse Linear Arrays

Wang, F. (author), Tian, Zhi (author), Leus, G.J.T. (author), Fang, Jun (author)

In this paper, we study the problem of wideband direction of arrival (DoA) estimation with sparse linear arrays (SLAs), where a number of uncorrelated wideband signals impinge on an SLA and the data is collected from multiple frequency bins. To boost the performance and perform underdetermined DoA estimation, the difference co-array response...

journal article 2021

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A Delayed and Subsampled Wideband Sparse Array for Joint Angle and Frequency Estimation

Wang, F. (author), Leus, G.J.T. (author)

In this paper we consider the problem of joint wideband spectrum sensing and direction-of-arrival (DoA) estimation, where a number of uncorrelated narrowband sources spread over a wide frequency band impinge on a sparse linear array (SLA). To overcome the sampling rate bottleneck for wideband spectrum sensing, we rely on sub-Nyquist sampling for...

conference paper 2021

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Time dependence of susceptible-infected-susceptible epidemics on networks with nodal self-infections

Van Mieghem, P.F.A. (author), Wang, F. (author)

The average fraction of infected nodes, in short the prevalence, of the Markovian ɛ-SIS (susceptible-infected-susceptible) process with small self-infection rate ɛ>0 exhibits, as a function of time, a typical "two-plateau" behavior, which was first discovered in the complete graph KN. Although the complete graph is often dismissed as an...

journal article 2020

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Wideband Direction of Arrival Estimation with Sparse Linear Arrays

Wang, F. (author), Tian, Zhi (author), Fang, Jun (author), Leus, G.J.T. (author)

This paper concerns wideband direction of arrival (DoA) estimation with sparse linear arrays (SLAs). We rely on the assumption that the power spectrum of the wideband sources is the same up to a scaling factor, which could in theory allow us to resolve not only more sources than the number of antennas but also more sources than the number of...

conference paper 2020

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Sulfonamides removal under different redox conditions and microbial response to sulfonamides stress during riverbank filtration: A laboratory column study

Bai, Ying (author), Ruan, Xiaohong (author), Wang, F. (author), Garnier, Antoine (author), van der Hoek, J.P. (author)

Riverbank filtration (RBF) as a barrier of pathogenic microorganisms and organic micropollutants recently has been proven capable of removing sulfonamides. However, the study about the effect of redox conditions on biodegradation of common and persistent sulfonamides in RBF is limited and the response of microbial communities to sulfonamides...

journal article 2019

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Linearity Research of A CMOS Image Sensor

Wang, F. (author)

This thesis provides a thorough analysis of the linearity characteristics of a CMOS image sensor. Firstly, this thesis analyzes the factors that cause the nonlinearity of the image sensors. These factors are then verified by simulation results of a proposed behavioral model and the measurements in a prototype chip. Secondly, different techniques...

doctoral thesis 2018

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Managed aquifer recharge as a barrier for ozone-based advanced oxidation by-products: BrO3- and H2O2

Wang, F. (author)

Managed Aquifer Recharge (MAR) is a technology that relies on soil passage - after pond infiltration - for water treatment. MAR is a proven technology for the removal of pathogenic micro-organisms, turbidity and a selection of specific organic micro-pollutions (OMPs). Nevertheless, removal of the wide variety of OMPs found in surface waters...

doctoral thesis 2018

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Bromate reduction by iron(II) during managed aquifer recharge: A laboratory-scale study

Wang, F. (author), Salgado Ismodes, V.A. (author), van der Hoek, J.P. (author), van Halem, D. (author)

The removal of bromate (BrO₃ ^-) as a byproduct of ozonation in subsequent managed aquifer recharge (MAR) systems has so far gained little attention. This preliminary study with anoxic batch experiments was executed to explore the feasibility of chemical BrO₃ ^- reduction in Fe-reducing zones of MAR...

journal article 2018

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Committee III.2: Fatigue and Fracture

Garbatov, Y. (author), Ås, S.K. (author), Branner, Kim (author), Choi, B.K. (author), den Besten, J.H. (author), Dong, P. (author), Lillemäe, I. (author), Lindstrom, P. (author), Lourenço de Souz, M. (author), Parmentier, G. (author), Quéméner, Y. (author), Rizzo, C.M. (author), Rörup, J. (author), Vhanmane, Suhas (author), Villavicencio, R. (author), Wang, F. (author), Yuan, Yue (author)

Concern for crack initiation and growth under cyclic loading as well as unstable crack propagation and tearing in the ship and offshore structures. Due attention shall be paid to the suitability and uncertainty of physical models and testing. Consideration is to be given to practical application, statistical description and fracture control...

conference paper 2018

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Hydrogen sulfide detection properties of Pt-gated AlGaN/GaN HEMT-sensor

Sokolovskij, R. (author), Zhang, Jian (author), Iervolino, E. (author), Zhao, Changhui (author), Santagata, F. (author), Wang, F. (author), Yu, Hongyu (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)

AlGaN/GaN high electron mobility transistor (HEMT)-based sensors with catalytic platinum gate were micro-fabricated on commercially available epitaxial wafers and extensively characterized for ppm level hydrogen sulfide (H₂S) detection for industrial safety applications. High operating temperature above 150 °C enabled large signal...

journal article 2018

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System in package (SiP) technology: Fundamentals, design and applications

Santagata, F. (author), Sun, J. (author), Iervolino, E. (author), Yu, H. (author), Wang, F. (author), Zhang, Kouchi (author), Sarro, Pasqualina M (author), Zhang, Guoyi (author)

Purpose: The purpose of this paper is to demonstrate a novel 3D system-in-package (SiP) approach. This new packaging approach is based on stacked silicon submount technology. As demonstrators, a smart lighting module and a sensor systems were successfully developed by using the fabrication and assembly process described in this paper. Design...

journal article 2018

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Effect of residual H2O2 from advanced oxidation processes on subsequent biological water treatmen: A laboratory batch study

Wang, F. (author), van Halem, D. (author), Liu, G. (author), Lekkerkerker, K. (author), van der Hoek, J.P. (author)

H2O2 residuals from advanced oxidation processes (AOPs) may have critical impacts on the microbial ecology and performance of subsequent biological treatment processes, but little is known. The objective of this study was to evaluate how H2O2 residuals influence sand systems with an emphasis on dissolved organic carbon (DOC) removal, microbial...

journal article 2017