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Effects of sediment flushing operations versus natural floods on Chinook salmon survival

Panthi, Manisha (author), Lee, Aaron A. (author), Dahal, Sudesh (author), Omer, Amgad (author), Franca, M.J. (author), Crosato, A. (author)

Flushing is a common measure to manage and reduce the amount of sediment stored in reservoirs. However, the sudden release of large volumes of sediment abruptly increases the suspended solids concentration and alters the riverbed composition. Similar effects can be produced also by natural flood events. Do flushing operations have more...

journal article 2022

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Multi-objective design of aircraft maintenance using Gaussian process learning and adaptive sampling

Lee, J. (author), Mitici, M.A. (author)

Aircraft maintenance design aims to identify strategies that render the aircraft reliable for flight in a cost-efficient manner. These are often conflicting objectives. Moreover, existing studies on maintenance design often limit themselves to only one type of maintenance strategy, overlooking other potentially dominating designs. We propose...

journal article 2022

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Self-Sealing Complex Oxide Resonators

Lee, M. (author), Robin, M.P. (author), Guis, R.H. (author), Filippozzi, U. (author), Shin, D. (author), van Thiel, T.C. (author), Paardekooper, Stijn P. (author), Renshof, Johannes R. (author), van der Zant, H.S.J. (author), Caviglia, A. (author), Verbiest, G.J. (author), Steeneken, P.G. (author)

Although 2D materials hold great potential for next-generation pressure sensors, recent studies revealed that gases permeate along the membrane-surface interface, necessitating additional sealing procedures. In this work, we demonstrate the use of free-standing complex oxides as self-sealing membranes that allow the reference cavity beneath...

journal article 2022

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An Output Bandwidth Optimized 200-Gb/s PAM-4 100-Gb/s NRZ Transmitter With 5-Tap FFE in 28-nm CMOS

Wang, Zhongkai (author), Choi, Minsoo (author), Lee, Kyoungtae (author), Park, Kwanseo (author), Liu, Zhaokai (author), Biswas, Ayan (author), Han, Jaeduk (author), Du, S. (author), Alon, Elad (author)

This article presents a 200-Gb/s pulse amplitude-modulation four-level (PAM-4) and 100-Gb/s non-return-to-zero (NRZ) transmitter (TX) in 28-nm CMOS technology. To achieve the target data rate, the output bandwidth and swing of the proposed TX are optimized by minimizing the output capacitance of the 4:1 multiplexer (MUX) and driver stage with...

journal article 2022

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A shift from chemical oxygen demand to total organic carbon for stringent industrial wastewater regulations: Utilization of organic matter characteristics

Park, Ji Won (author), Kim, S. (author), Noh, Jin Hyung (author), Bae, Young Ho (author), Lee, Jae Woo (author), Maeng, Sung Kyu (author)

From 2022, industrial wastewater discharge regulations in South Korea will replace chemical oxygen demand (COD_Mn) with total organic carbon (TOC). A shift from COD_Mn to TOC is a pioneering change in protecting water bodies from organic contaminants. However, several industries are struggling to meet these TOC...

journal article 2022

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Development of deep learning-based joint elements for thin-walled beam structures

Jeon, Jaemin (author), Kim, Jaeyong (author), Lee, Jong Jun (author), Shin, D. (author), Kim, Yoon Young (author)

This study presents a new modeling technique to estimate the stiffness matrix of a thin-walled beam-joint structure using deep learning. When thin-walled beams meet at joints, significant sectional deformations occur, such as warping and distortion. These deformations should be considered in the one-dimensional beam analysis, but it is...

journal article 2022

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An Approach to Update the Failure Rates of Safety Barriers Based on Operating Experience

Lee, Shenae (author), Khakzad, Nima (author), Schmitz, P.J.H. (author), Reniers, G.L.L.M.E. (author), Habrekke, Solfrid (author), Paltrinieri, Nicola (author)

Hazardous events in process plants like the leakage of dangerous substances can result in severe damage, and such an event is often defined as the TOP event of a fault tree analysis (FTA) in a quantitative risk analysis. The TOP event probability can then be calculated if the basic events probabilities are provided. These probabilities are often...

journal article 2022

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Path-oriented synchronized transit scheduling using time-dependent data

Lee, Kelvin (author), Jiang, Yu (author), Ceder, Avishai (Avi) (author), Dauwels, J.H.G. (author), Su, Rong (author), Nielsen, Otto Anker (author)

With the emergence of innovations associated with public transport (PT) services, such as Mobility-as-a-Service, demand responsive transit, and autonomous vehicles, the door-to-door PT journey is achievable via multiple transfers between and within different PT modes. As such, seamless transfers between different modes of public...

journal article 2022

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International benchmark study on numerical simulation of flooding and motions of a damaged cruise ship

Ruponen, Pekka (author), van Basten Batenburg, Rinnert (author), van't Veer, Riaan (author), Braidotti, Luca (author), Bu, Shuxia (author), Dankowski, Hendrik (author), Lee, Gyeong Joong (author), Mauro, F. (author), Ruth, Eivind (author), Tompuri, Markus (author)

Large cruise ships can carry 10 000 persons onboard, and consequently, survivability of the ship in the event of a flooding accident is essential. Many designers are already conducting advanced damage stability analyses beyond the regulatory requirements. With increased computing capacity, survivability analyses, by using time-domain...

journal article 2022

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An Offset Calibration Technique for CIS Column-Parallel SAR ADCs Using Memory

Lee, J. (author), Theuwissen, A.J.P.A.M. (author)

A column-parallel 10-bit SAR ADC for high-speed image sensors has been implemented. A fast offset calibration technique using memory is proposed to compensate for the offset mismatch, accompanied by an ADC designed for a narrow space the size of a single column pitch. The memory accumulates the variation of the offset to track the offset...

journal article 2022

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Deformation and strain limits for IPB-loaded high strength steel CHS joints

Kim, Seon Hu (author), Lee, Cheol Ho (author), Han, Sang Hui (author), Wardenier, J. (author)

In this study, existing deformation limits are first re-examined to investigate if they can be rationally extended to high strength steel circular hollow section (CHS) joints that are subjected to in-plane bending (IPB) moment. It is pointed out that existing deformation limits, which have been developed and validated primarily for mild steel...

journal article 2022

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Nanomechanical probing and strain tuning of the Curie temperature in suspended Cr₂Ge₂Te₆-based heterostructures

Siskins, M. (author), Kurdi, S. (author), Lee, M. (author), Slotboom, Benjamin J.M. (author), Xing, Wenyu (author), Mañas-Valero, Samuel (author), Coronado, Eugenio (author), Jia, Shuang (author), Han, Wei (author), van der Sar, T. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author)

Two-dimensional magnetic materials with strong magnetostriction are attractive systems for realizing strain-tuning of the magnetization in spintronic and nanomagnetic devices. This requires an understanding of the magneto-mechanical coupling in these materials. In this work, we suspend thin Cr₂Ge₂Te₆ layers...

journal article 2022

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Exact spatial and temporal balance of energy exchanges within a horizontally explicit/vertically implicit non-hydrostatic atmosphere

Lee, David (author), Palha, A. (author)

A new horizontally explicit/vertically implicit (HEVI) time splitting scheme for atmospheric modelling is introduced, for which the horizontal divergence terms are applied within the implicit vertical substep. The new HEVI scheme is implemented in conjunction with a mixed mimetic spectral element spatial discretisation and semi-implicit...

journal article 2021

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Will pedestrians cross the road before an automated vehicle?: The effect of drivers’ attentiveness and presence on pedestrians’ road crossing behavior

Nuñez Velasco, J.P. (author), Lee, Yee Mun (author), Uttley, Jim (author), Solernou, Albert (author), Farah, H. (author), van Arem, B. (author), Hagenzieker, Marjan (author), Merat, Natasha (author)

The impact of automated vehicles (AV) on pedestrians’ crossing behavior has been the topic of some recent studies, but findings are still scarce and inconclusive. The aim of this study is to determine whether the drivers’ presence and apparent attentiveness in a vehicle influences pedestrians’ crossing behavior, perceived behavioral control,...

journal article 2021

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On the quality requirements of demand prediction for dynamic public transport

Peled, Inon (author), Lee, Kelvin (author), Jiang, Yu (author), Dauwels, J.H.G. (author), Pereira, Francisco C. (author)

As Public Transport (PT) becomes more dynamic and demand-responsive, it increasingly depends on predictions of transport demand. But how accurate need such predictions be for effective PT operation? We address this question through an experimental case study of PT trips in Metropolitan Copenhagen, Denmark, which we conduct independently of any...

journal article 2021

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Tailoring nanostructured NbCoSn-based thermoelectric materials via crystallization of an amorphous precursor

Jung, Chanwon (author), Dutta, B. (author), Dey, P. (author), Jeon, Seong jae (author), Han, Seungwoo (author), Lee, Hyun Mo (author), Park, Jin Seong (author), Yi, Seong Hoon (author), Choi, Pyuck Pa (author)

Tailoring nanostructures is nowadays a common approach for enhancing the performance of thermoelectric Heusler compounds by decreasing the thermal conductivity without significantly affecting the electrical conductivity. However, the most widely reported method for obtaining nanostructured thermoelectrics, an approach based on crushing as...

journal article 2021

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A New Adaptive-Robust Design for Time Delay Control under State-Dependent Stability Condition

Roy, S. (author), Lee, Jinoh (author), Baldi, S. (author)

This brief proposes a new adaptive-robust formulation for time-delay control (TDC) under a less-restrictive stability condition. TDC relies on estimating the unknown system dynamics via the artificial introduction of a time delay, often referred to as time-delay estimation (TDE). In conventional TDC, the estimation error, called TDE error, is...

journal article 2021

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Mechanical resonance properties of porous graphene membrane; simulation study and proof of concept experiment

Yoon, Juhee (author), Kwon, Min Hee (author), Shin, D. (author), Lee, Sang Wook (author)

Mechanical resonance properties of porous graphene resonators were investigated by simulation studies. The finite element method was utilized to design the porous graphene membrane pattern and to calculate the mechanical resonance frequency and quality factor. The changes in the resonance frequency and quality factor were systematically...

journal article 2021

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Association between thyroid function and heart rate monitored by wearable devices in patients with hypothyroidism

Kim, K. (author), Lee, Juhui (author), Ahn, Chang Ho (author), Yu, Hyeong Won (author), Choi, June Young (author), Lee, Ho Young (author), Lee, Won Woo (author), Moon, Jae Hoon (author)

Background: Heart rate (HR) monitored by a wearable device (WD) has demonstrated its clinical feasibility for thyrotoxicosis subjects. However, the association of HR monitored by wearables with hypothyroidism has not been examined. We assessed the association between serum thyroid hormone concentration and three WD-HR parameters in...

journal article 2021

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Chemical Design and Magnetic Ordering in Thin Layers of 2D Metal-Organic Frameworks (MOFs)

López-Cabrelles, Javier (author), Mañas-Valero, Samuel (author), Vitórica-Yrezábal, Iñigo J. (author), Siskins, M. (author), Lee, M. (author), Steeneken, P.G. (author), van der Zant, H.S.J. (author), Mínguez Espallargas, Guillermo (author), Coronado, Eugenio (author)

Through rational chemical design, and thanks to the hybrid nature of metal-organic frameworks (MOFs), it is possible to prepare molecule-based 2D magnetic materials stable at ambient conditions. Here, we illustrate the versatility of this approach by changing both the metallic nodes and the ligands in a family of layered MOFs that allows the...

journal article 2021