Searched for: author%3A%22Xu%2C+J.%22
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Xu, J. (author)
journal article 2009
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Xu, J. (author)
journal article 2010
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Xu, J. (author), Yazicioglu, Refet Firat (author), Grundlehner, Bernard (author), Harpe, Pieter (author), Makinwa, K.A.A. (author), Van Hoof, Chris (author)
This paper presents an active electrode system for gel-free biopotential EEG signal acquisition. The system consists of front-end chopper amplifiers and a back-end common-mode feedback (CMFB) circuit. The front-end AC-coupled chopper amplifier employs input impedance boosting and digitally-assisted<br/>offset trimming. The former increases the...
journal article 2011
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Weerheijm, J. (author), Lu, Y. (author), Xu, J. (author)
This paper presents a numerical modelling study on the simulation of the cracking process and fracture energy in concrete under high strain rate. To capture the stress wave effect and the damage evolution at the meso-length scale, both a homogeneous model with a millimetreresolution mesh and an explicit heterogeneous mesoscale model with random...
conference paper 2013
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Xu, J (author), Mitra, S (author), Matsumoto, A (author), Patki, S (author), van Hoof, C (author), Makinwa, K.A.A. (author)
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journal article 2014
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Xu, J. (author), Broekens, D.J. (author), Hindriks, K.V. (author), Neerincx, M.A. (author)
Mood contagion is an automatic mechanism that induces a congruent mood state by means of the observation of another person's emotional expression. In this paper, we address the question whether robot mood displayed during an imitation game can (a) be recognized by participants and (b) produce contagion effects. Robot mood was displayed by...
conference paper 2014
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Xu, J. (author), Büsze, Benjamin (author), Van Hoof, Chris (author), Makinwa, K.A.A. (author), Yazicioglu, Refet Firat (author)
This paper presents a digital active electrode (DAE) system for multi-parameter biopotential signal acquisition in portable and wearable devices. It is built around an IC that performs analog signal processing and digitization with the help<br/>of on-chip instrumentation amplifiers, a 12 bit ADC and a digital interface. Via a standard bus, up to...
journal article 2015
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Xu, J. (author), Broekens, D.J. (author), Hindriks, K.V. (author), Neerincx, M.A. (author)
The aim of our work is to design bodily mood expressions of humanoid robots for interactive settings that can be recognized by users and have (positive) effects on people who interact with the robots. To this end, we develop a parameterized behavior model for humanoid robots to express mood through body language. Different settings of the...
journal article 2015
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Xu, J. (author)
doctoral thesis 2015
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Xu, J. (author), van den Boom, A.J.J. (author), Busoniu, L (author), De Schutter, B.H.K. (author)
This paper considers model predictive control for continuous piecewise affine (PWA) systems. In general, this leads to a nonlinear, nonconvex optimization problem. We introduce an approach based on optimistic optimization to solve the resulting optimization problem. Optimistic optimization is based on recursive partitioning of the feasible set...
conference paper 2016
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Xu, J. (author), Busoniu, L (author), van den Boom, A.J.J. (author), De Schutter, B.H.K. (author)
This paper addresses the infinite-horizon optimal control problem for max-plus linear systems where the considered objective function is a sum of discounted stage costs over an infinite horizon. The minimization problem of the cost function is equivalently transformed into a maximization problem of a reward function. The resulting optimal...
conference paper 2016
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Xu, J. (author)
doctoral thesis 2016
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Xu, J. (author), Mitra, Srinjoy (author), Van Hoof, Chris (author), Yazicioglu, Refet Firat (author), Makinwa, K.A.A. (author)
Active electrodes (AEs), i.e., electrodes with built-in readout circuitry, are increasingly being implemented in wearable healthcare and lifestyle applications due to AEs' robustness to environmental interference. An AE locally amplifies and buffers μV-level EEG signals before driving any cabling. The low output impedance of an AE mitigates...
journal article 2017
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Xu, J. (author), Buşoniu, Lucian (author), De Schutter, B.H.K. (author)
We consider the infinite-horizon optimal control of discrete-time, Lipschitz continuous piecewise affine systems with a single input. Stage costs are discounted, bounded, and use a 1 or ∞-norm. Rather than using the usual fixed-horizon approach from model-predictive control, we tailor an adaptive-horizon method called optimistic planning for...
conference paper 2017
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Hou, T. (author), Xu, J. (author), Elkhuizen, W.S. (author), Wang, C.C. (author), Jiang, Jiehui (author), Geraedts, Jo M.P. (author), Song, Y. (author)
2D coil design limits the use of wireless power transfer (WPT) in many products with freeform outer shapes. In this paper, enabled by 3D printed electronics, we propose a systematic approach to design and fabricate 3D coils for WPT. Based on the circular spiral and rectangular spiral patterns, 3D receiver and transmitter coils can be...
journal article 2019
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Xu, J. (author)
This PhD thesis considers the development of optimization and model-based control techniques for max-plus linear (MPL) and continuous piecewise affine (PWA) systems. The three main topics investigated in this thesis are as follows: 1. Optimistic optimization and planning for model-based control of MPL systems; 2. Optimistic optimization for MPC...
doctoral thesis 2019
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De Schutter, B.H.K. (author), van den Boom, A.J.J. (author), Xu, J. (author), Safaei Farahani, S. (author)
The objective of this paper is to provide a concise introduction to the max-plus algebra and to max-plus linear discrete-event systems. We present the basic concepts of the max-plus algebra and explain how it can be used to model a specific class of discrete-event systems with synchronization but no concurrency. Such systems are called max...
journal article 2020
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Ping, Y. (author), Yao, X. (author), Xu, J. (author), Li, Juntian (author), Song, Y. (author), Vink, P. (author)
The angle of attack (AOA) of an airplane changes the direction of the gravitational force on passengers and thereby might influence passengers’ flying experience. However, the contribution of the AOA regarding comfort/discomfort is not fully explored. In this paper, we aim to fill this knowledge gap by identifying the relationships between the...
conference paper 2021
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Wu, Y. (author), Soeiro, Thiago B. (author), Shekhar, A. (author), Xu, J. (author), Bauer, P. (author)
LCL filter is widely adopted for strict standard compliance of grid-tied voltage source converters (VSCs). The third order low-pass filtering provides great attenuation for the high frequency harmonics generated by the power electronics guaranteeing low output currents noise injection into the grid. A major concern of the implementation of the...
conference paper 2021
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Xu, J. (author), Yang, Gongliu (author), Sun, Yiding (author), Picek, S. (author)
The current navigation systems used in many autonomous mobile robotic applications, like unmanned vehicles, are always equipped with various sensors to get accurate navigation results. The key point is to fuse the information from different sensors efficiently. However, different sensors provide asynchronous measurements, some of which even...
journal article 2021
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