Explanipedia

Linear Convergence Analysis of Single-loop Algorithm for Bilevel Optimization via Small-gain Theorem Open

Jianhui Li, Shi Pu, Jianqi Chen, Junfeng Wu · 2024

Bilevel optimization has gained considerable attention due to its broad applicability across various fields. While several studies have investigated the convergence rates in the strongly-convex-strongly-convex (SC-SC) setting, no prior wor…

A Cyclic Small Phase Theorem Open

Chao Chen, Wei Chen, Di Zhao, Jianqi Chen, Li Qiu · 2023

This paper introduces a brand-new phase definition called the segmental phase for multi-input multi-output linear time-invariant systems. The underpinning of the definition lies in the matrix segmental phase which, as its name implies, is …

Phase Preservation of N-Port Networks under General Connections Open

Jianqi Chen, Wei Chen, Chao Chen, Li Qiu · 2023

This study first introduces the frequency-wise phases of n-port linear time-invariant networks based on recently defined phases of complex matrices. Such a phase characterization can be used to quantify the well-known notion of passivity f…

Classical Stability Margins by PID Control Open

Qi Mao, Yong Xu, Jianqi Chen, Jie Chen, Tryphon T. Georgiou · 2023

Proportional-Integral-Derivative (PID) control has been the workhorse of control technology for about a century. Yet to this day, designing and tuning PID controllers relies mostly on either tabulated rules (Ziegler-Nichols) or on classica…

Zero-Shot Image Harmonization with Generative Model Prior Open

Jianqi Chen, Zhengxia Zou, Yilan Zhang, Keyan Chen, Zhenwei Shi · 2023

We propose a zero-shot approach to image harmonization, aiming to overcome the reliance on large amounts of synthetic composite images in existing methods. These methods, while showing promising results, involve significant training expens…

Dense Pixel-to-Pixel Harmonization via Continuous Image Representation Open

Jianqi Chen, Yilan Zhang, Zhengxia Zou, Keyan Chen, Zhenwei Shi · 2023

High-resolution (HR) image harmonization is of great significance in real-world applications such as image synthesis and image editing. However, due to the high memory costs, existing dense pixel-to-pixel harmonization methods are mainly f…

Continuous Remote Sensing Image Super-Resolution based on Context Interaction in Implicit Function Space Open

Keyan Chen, Wenyuan Li, Sen Lei, Jianqi Chen, Xiaolong Jiang , et al. · 2023

Despite its fruitful applications in remote sensing, image super-resolution is troublesome to train and deploy as it handles different resolution magnifications with separate models. Accordingly, we propose a highly-applicable super-resolu…

OvarNet: Towards Open-vocabulary Object Attribute Recognition Open

Keyan Chen, Xiaolong Jiang, Yao Hu, Xu Tang, Yan Gao , et al. · 2023

In this paper, we consider the problem of simultaneously detecting objects and inferring their visual attributes in an image, even for those with no manual annotations provided at the training stage, resembling an open-vocabulary scenario.…

A Cyclic Small Phase Theorem for MIMO LTI Systems* Open

Chao Chen, Wei Chen, Di Zhao, Jianqi Chen, Li Qiu · 2023

This paper introduces a brand-new phase definition called the segmental phase for multi-input multi-output linear time-invariant systems. The underpinning of the definition lies in the matrix segmental phase which, as its name implies, is …

Removal of Microparticles from Hydrogenated Oil by a Microchannel Separation Coupling Hydrocyclone: Industrial Application Open

Aosong Wei, Caili Dai, Pengcheng Tao, Zhuofan Deng, Dingliang Xu , et al. · 2023

Nanoscale mechanical property variations concerning mineral composition and contact of marine shale Open

Yong Li, Jianqi Chen, Derek Elsworth, Zhejun Pan, Xiaotian Ma · 2022

Mechanical properties of shales are key parameters influencing hydrocarbon production – impacting borehole stability, hydraulic fracture extension and microscale variations in in situ stress. We use Ordovician shale (Sichuan Basin, China) …

Geometrical Characterization of Sensor Placement for Cone-Invariant and Multi-Agent Systems against Undetectable Zero-Dynamics Attacks Open

Jianqi Chen, Jieqiang Wei, Wei Chen, Henrik Sandberg, Karl Henrik Johansson , et al. · 2022

Undetectable attacks are an important class of malicious attacks threatening the security of cyber-physical systems, which can modify a system's state but leave the system output measurements unaffected and hence cannot be detected from th…

Delay Effect on First-Order Consensus over Directed Graphs: Optimizing PID Protocols for Maximal Robustness Open

Dan Ma, Jianqi Chen, Renquan Lu, Jie Chen, Tianyou Chai · 2022

Delay Effect on First-Order Consensus over Directed Graphs: Optimizing PID Protocols for Maximal Robustness

Stability Analysis of Systems with Recurrent Neural Network Controllers Open

Wuwei Wu, Jianqi Chen, Jie Chen · 2022

The increasing utilization of recurrent neural networks (RNNs) in feedback control and the complexity of RNNs motivate us to provide a method for verifying the stability of RNN-controlled systems. To circumvent the nonlinearities in RNNs, …

PID control design for first-order delay systems via MID pole placement: Performance vs. robustness Open

Dan Ma, Islam Boussaada, Jianqi Chen, Karim Trabelsi, Silviu‐Iulian Niculescu · 2021

Mean-Square Stability and Stabilizability Analyses of LTI Systems Under Spatially Correlated Multiplicative Perturbations Open

Jianqi Chen, Qi Tian, Jie Chen · 2021

In this paper, we investigate the mean-square stability and stabilizability problems for linear time-invariant systems under stochastic spatially correlated multiplicative uncertainties.

Geometrical Characterization of Sensor Placement for Cone-Invariant and Multi-Agent Systems against Undetectable Zero-Dynamics Attacks Open

Jianqi Chen, Jieqiang Wei, Wei Chen, Henrik Sandberg, Karl Henrik Johansson , et al. · 2021

Undetectable attacks are an important class of malicious attacks threatening the security of cyber-physical systems, which can modify a system's state but leave the system output measurements unaffected, and hence cannot be detected from t…

Insights on Pole-Placement of Dynamical Systems by PID Control with Guaranteed Delay Robustness Open

Islam Boussaada, Dan Ma, Jianqi Chen, Catherine Bonnet, Silviu‐Iulian Niculescu , et al. · 2021

Lower Bounds on Delay Margin of Second-Order Unstable Systems Open

Dan Ma, Jianqi Chen, Andong Liu, Jie Chen, Silviu‐Iulian Niculescu · 2018

International audience

Protecting Positive and Second-Order Systems against Undetectable Attacks Open

Jianqi Chen, Jieqiang Wei, Wei Chen, Henrik Sandberg, Karl Henrik Johansson , et al. · 2017

Undetectable attacks in security studies of cyber-physical systems render the measurements of the system equal to a possible physical response. In this paper, we investigate defense strategies against the undetectable single-attack for pos…

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