Liqing Zhang

ORCID: 0000-0001-5657-1812
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Transportation Planning and Optimization
  • Railway Systems and Energy Efficiency
  • Traffic Prediction and Management Techniques
  • Advanced Wireless Communication Technologies
  • Elevator Systems and Control
  • Traffic control and management
  • Wireless Communication Security Techniques
  • Cooperative Communication and Network Coding
  • GaN-based semiconductor devices and materials
  • Evaluation Methods in Various Fields
  • Semiconductor materials and devices
  • Power Transformer Diagnostics and Insulation
  • High voltage insulation and dielectric phenomena
  • Railway Engineering and Dynamics
  • Industrial Vision Systems and Defect Detection
  • Ion-surface interactions and analysis
  • Power Quality and Harmonics
  • IoT Networks and Protocols
  • Virtual Reality Applications and Impacts
  • Innovative Energy Harvesting Technologies
  • Vibration Control and Rheological Fluids
  • Cellular and Composite Structures
  • Thermal Analysis in Power Transmission
  • Digital Transformation in Industry
  • Wireless Power Transfer Systems

University of Macau
2020-2025

Virginia Tech
2022-2024

City University of Macau
2020-2023

Bridge University
2023

Yibin University
2023

China Agricultural University
2023

Shanghai Jiao Tong University
2023

Huawei Technologies (Canada)
2017-2019

Dalian University of Technology
2017

University of Chinese Academy of Sciences
2017

The performances of defect inspection have been severely hindered by insufficient images in industries, which can be alleviated generating more samples as data augmentation. We propose the first image generation method challenging few-shot cases. Given just a handful and relatively defect-free ones, our goal is to augment dataset with new images. Our consists two training stages. First, we train data-efficient StyleGAN2 on backbone. Second, attach defect-aware residual blocks backbone, learn...

10.1609/aaai.v37i1.25132 article EN Proceedings of the AAAI Conference on Artificial Intelligence 2023-06-26

5G wireless networks are expected to support new applications demanding ultra high reliability and low latency, such as self-driving cars, industrial control, real-time gaming. Such services known ultra-reliable low-latency communications (URLLC) targeting at 99.999% transmission correctness within 1 ms delay bound. Current Long Term Evolution (LTE) system is far from supporting services, especially for uplink. Even with around 10 times shortened interval, due the waste of time in requesting...

10.1109/vtcspring.2017.8108593 article EN 2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring) 2017-06-01

This manuscript investigates the equity-oriented train regulation optimization problem by formulating it as a Markov Decision Process and addressing through Lagrange relaxation methodology. To ensure equitable service meet safety requirements, we propose constrained Deep Reinforcement Learning approach. approach utilizes reshaped reward functions to enforce hard constraints enables dynamic adjustment of policies throughout learning phase. Leveraging an actor-critic framework, this handles...

10.2139/ssrn.5088951 preprint EN 2025-01-01

Abstract To solve the problem of low magnetic field utilization traditional magnetorheological (MR) brakes, a cylindrical MR brake with inner and outer fluid flow channels was proposed in this paper. By adding non-magnetic device to rotating sleeve cylinder, flux lines meandered through six effective damping gaps axial channels, allowing achieve better braking performance without changing its external dimensions. The structure working principle were depicted, circuit analysis also carried...

10.1088/1402-4896/adc17c article EN Physica Scripta 2025-03-17

Train operation control in urban railways is challenging due to its high dynamics, complex environment, and level of comfort safety. To address these challenges, this article, the authors propose a new deep reinforcement-based train (DRTO) method which includes: 1) A deterministic reinforcement learning algorithm, 2) dynamic incentive system, used ensure safe multitrain 3) an event-driven method, improve DRTO performance based on strategy. evaluate performance, we thoroughly compare proposed...

10.1109/tii.2021.3138098 article EN IEEE Transactions on Industrial Informatics 2021-12-24

Traction transformer is vital equipment in high-speed railway. Insulation status decides its safety and reliability, the frequency-domain dielectric spectrum (FDS) test one of most effective methods reflecting changing insulation status. For field applications, following problems should be addressed: 1) how to obtain result paper from combined oil-paper system 2) discriminate defects between aging damp. In this article, first problem was transferred a nonlinear equation set, cuckoo search...

10.1109/tte.2020.3018268 article EN IEEE Transactions on Transportation Electrification 2020-08-20

Vision transformers (ViTs) have recently received explosive popularity, but the huge computational cost is still a severe issue. Since computation complexity of ViT quadratic with respect to input sequence length, mainstream paradigm for reduction reduce number tokens. Existing designs include structured spatial compression that uses progressive shrinking pyramid computations large feature maps, and unstructured token pruning dynamically drops redundant However, limitation existing lies in...

10.48550/arxiv.2108.01390 preprint EN public-domain arXiv (Cornell University) 2021-01-01

This manuscript focuses on investigating the metro network expansion problem, which is formulated as a Markov Decision Process and addressed using sequential station selection methodology. To identify an effective strategy, we introduce multi-objective reinforcement learning framework, encompasses objectives such traffic demands, social equity, accessibility. The proposed method effectively eliminates need for domain-specific rules expert guidance by leveraging reward calculations to...

10.2139/ssrn.4837977 preprint EN 2024-01-01

Transportation-related consumer electronics technology has advanced rapidly, particularly for automated train operation on high-speed railways. To maximize transport capacity and meet growing demands, this manuscript proposes a new elastic tracking control method, that compresses the interval while maintaining safety. The process is formulated as Monte Carlo Twin Delayed Deep Deterministic policy gradient (TD3) algorithm used to generate basic strategy. A three-stage principle requirements...

10.1109/tce.2023.3245334 article EN IEEE Transactions on Consumer Electronics 2023-02-23

The next generation new radio (NR) network, or the fifth (5G) system, will be able to enhance significantly current Long Term Evolution (LTE), fourth (4G) network from many perspectives and initiations. One of such initiations is support Ultra Reliable Low Latency Communication (URLLC) services, especially transmission small but critical control related packets with periodic aperiodic traffic patterns very stringent latency (e.g, less than 1 ms)and reliability (up 99.999% 99.9999%)....

10.1109/iccw.2019.8757186 article EN 2022 IEEE International Conference on Communications Workshops (ICC Workshops) 2019-05-01

Traction transformers are one of the most important equipment in traction power supply system. Thermal aging transformer insulation system determines its reliable life. To achieve an estimation life operated under real load condition, effects loads on thermal oil-paper were investigated. First, design principles for accelerated experiment studied and proposed by considering magnitude (i.e., rate) frequency (i.e. spare time lasting time) load. Then, experimental was established laboratory to...

10.1109/tpwrd.2020.3024839 article EN IEEE Transactions on Power Delivery 2020-09-21

N-type GaN films bombarded with different highly charged 126Xeq+-ions(9≤q≤30) at room temperature was studied by atomic force microscopy. The experimental results show that when q exceeds the threshold value 18, remarkable swelling turns into obvious erosion in irradiated area. On other hand, surface disorder of strongly depends on charge state ions, incident angle and ion influence, damage behavior is unrelated to kinetic energy within scope parameters(180 keV≤Ek≤600 keV).For q=18,...

10.7498/aps.58.5578 article EN cc-by Acta Physica Sinica 2009-01-01

Abstract For passengers traveling by the railway, a reasonable train timetable can improve passenger satisfaction efficiently, and service quality of railway transport. Existing related research focuses on reprogramming from perspective operating time income, but how to optimize rationality travel has not been greatly resolved. Therefore, this paper proposes multi-objective compilation method based sleep period checking. In system, quantitative calculation preference is defined, arrival...

10.21203/rs.3.rs-3849280/v1 preprint EN cc-by Research Square (Research Square) 2024-01-24

This paper proposes a multi-objective reinforcement learning approach for the metro network expansion problem. The problem is modeled as Markov Decision Process, treating it sequential station selection procedure. Through reward calculations to fine-tune policy during process, proposed method eliminates need expert guidance and problem-specific heuristics. To fully utilize traffic demands address curse of dimensionality, , an actor-critic framework employed generate next evaluate current...

10.2139/ssrn.4840050 preprint EN 2024-01-01

Virtual clothes try-on has emerged as a vital feature in online shopping, offering consumers critical tool to visualize how clothing fits. In our research, we introduce an innovative approach for virtual try-on, utilizing self-supervised Vision Transformer (ViT) coupled with diffusion model. Our method emphasizes detail enhancement by contrasting local image embeddings, generated ViT, their global counterparts. Techniques such conditional guidance and focus on key regions have been...

10.48550/arxiv.2406.10539 preprint EN arXiv (Cornell University) 2024-06-15

Inadequate information capture and transmission of multi-energy coupled integrated energy systems can lead to low utilization poor economic social benefits. To address this problem, paper proposes a real-time optimal scheduling strategy for in parks based on digital twin. Firstly, an system model with coupling the park is constructed twin technology; secondly, particle swarm algorithm used solve problem objective minimizing total operation cost. Finally, test (PIES) built CloudPSS platform...

10.1109/iccsse59359.2023.10245207 article EN 2023-06-16
Coming Soon ...