Wenjie Chen
This page is a disambiguation page, it actually contains mutiple papers from persons of the same or a similar name.
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Bibliography
2025
Research progress and prospects of urban flooding simulation: From traditional numerical models to deep learning approaches.
Environ. Model. Softw., 2025
2024
A Novel Virtual Capacitance Enhancement-Based Active EMI Filter for CM Noise Attenuation.
IEEE Trans. Ind. Electron., December, 2024
IEEE Trans. Ind. Electron., December, 2024
GOPT: Generalizable Online 3D Bin Packing via Transformer-Based Deep Reinforcement Learning.
IEEE Robotics Autom. Lett., November, 2024
A Current Controllable Active Transient-Voltage Compensation Circuit for Voltage Regulator Module.
IEEE Trans. Ind. Electron., August, 2024
IEEE Trans. Neural Networks Learn. Syst., April, 2024
Maximum Power Factor Tracking Technique for LCC-Capacitor Charging Power Supply Through Variable DC Link Voltage.
IEEE Trans. Ind. Electron., 2024
Positional normalization-based mixed-image data augmentation and ensemble self-distillation algorithm.
Expert Syst. Appl., 2024
CoRR, 2024
Generalized Averaging Method for Power Electronics Modeling from DC to above Half the Switching Frequency.
CoRR, 2024
An event logic graph for geographic environment observation planning in disaster chain monitoring.
Int. J. Appl. Earth Obs. Geoinformation, 2024
Proceedings of the 40th IEEE International Conference on Data Engineering, 2024
Distributed Algorithm for Time-Varying Convex Optimization with Fixed-Time Convergence.
Proceedings of the 18th IEEE International Conference on Control & Automation, 2024
2023
Optimal Power and Energy Management Control for Hybrid Fuel Cell-Fed Shipboard DC Microgrid.
IEEE Trans. Intell. Transp. Syst., December, 2023
Multi-sensor integration management in the earth observation sensor web: State-of-the-art and research challenges.
Int. J. Appl. Earth Obs. Geoinformation, December, 2023
Multim. Tools Appl., October, 2023
IEEE Trans. Mob. Comput., September, 2023
A hybrid shallow water approach with unstructured triangular grids for urban flood modeling.
Environ. Model. Softw., August, 2023
Multi-Fidelity Simulation Modeling for Discrete Event Simulation: An Optimization Perspective.
IEEE Trans Autom. Sci. Eng., April, 2023
A Multifrequency Small-Signal Model for the MLCL-Filtered Grid-Connected Inverter Considering the FCE of Nonlinear Inductors.
IEEE Trans. Ind. Electron., 2023
IEEE Trans. Ind. Electron., 2023
A Variable Configuration Force Sensor With Adjustable Resolution for Robotic Applications.
IEEE Trans. Ind. Electron., 2023
Real-Time Average Junction Temperature Estimation for Multichip IGBT Modules With Low Computational Cost.
IEEE Trans. Ind. Electron., 2023
A New Simultaneous Wireless Power and Information Transfer System With Integrated Signal Magnetic Coupler.
IEEE Trans. Ind. Electron., 2023
IEEE Robotics Autom. Lett., 2023
J. Syst. Softw., 2023
Circuits Syst. Signal Process., 2023
Neural Influence Estimator: Towards Real-time Solutions to Influence Blocking Maximization.
CoRR, 2023
Appl. Intell., 2023
Robust Real-Time Shipboard Energy Management System With Improved Adaptive Model Predictive Control.
IEEE Access, 2023
Recognition of Coil Position Information in Dynamic Wireless Charging System Based on Multiple Linear Regression.
Proceedings of the 49th Annual Conference of the IEEE Industrial Electronics Society, 2023
Slim-MY: A Lightweight Network for Power Line Defect Detection with FPGA Acceleration.
Proceedings of the 29th IEEE International Conference on Parallel and Distributed Systems, 2023
A Force Exertion Method for Redundant Mobile Manipulators Safely Operating in Small Spaces.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Design of a Three-Finger Underactuated Robotic Gripper Based on a Flexible Differential Mechanism.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
A Feature Extraction Algorithm for Exoskeleton Speech Control System Based on Noisy Environment.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Real-Time Smooth Corner Trajectory Planning for Industrial Robots Under Linear and Angular Kinematic Constraints.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Lightweight Design Method of Stacker Column Structure Based on Multi-parameter Sensitivity Analysis.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Optimization-based Coordinated Motion Planning for Redundant Wheeled Mobile Manipulator.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
An Efficient Robot Payload Identification Method Based on Decomposed Motion Experimental Approach.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
A Faster and More Robust Momentum Observer for Robot Collision Detection Based on Loop Shaping Techniques.
Proceedings of the Intelligent Robotics and Applications - 16th International Conference, 2023
Proceedings of the IEEE International Conference on Image Processing, 2023
Proceedings of the 43rd IEEE International Conference on Distributed Computing Systems, 2023
Proceedings of the 2023 International Conference on Computer, 2023
Proceedings of the 16th International Congress on Image and Signal Processing, 2023
2022
An Optimized Coil Array and Passivity-Based Control for Receiving Side Multilevel Connected DC-DC Converter of Dynamic Wireless Charging.
IEEE Trans. Veh. Technol., 2022
Modular DC Circuit Breaker With Master-Slave Concept for Gate Driver Simplification: Topology and Implementation.
IEEE Trans. Ind. Electron., 2022
Current Sharing Based on Incremental Passivity and Unknown Load Finite-Time Estimation for Multilevel Connected DC-DC Converters.
IEEE Trans. Ind. Electron., 2022
IEEE Trans. Ind. Electron., 2022
Weight Imprinting Classification-Based Force Grasping With a Variable-Stiffness Robotic Gripper.
IEEE Trans Autom. Sci. Eng., 2022
Multim. Tools Appl., 2022
Remote sensing scene classification with multi-spatial scale frequency covariance pooling.
Multim. Tools Appl., 2022
ConDinet++: Full-Scale Fusion Network Based on Conditional Dilated Convolution to Extract Roads From Remote Sensing Images.
IEEE Geosci. Remote. Sens. Lett., 2022
IEEE Intell. Transp. Syst. Mag., 2022
ConvPatchTrans: A script identification network with global and local semantics deeply integrated.
Eng. Appl. Artif. Intell., 2022
Data Generation, Testing and Evaluation of Chinese Natural Language Processing in the Cloud.
Proceedings of the 7th IEEE International Conference on Smart Cloud, SmartCloud 2022, 2022
Proceedings of the IEEE Intl Conf on Parallel & Distributed Processing with Applications, 2022
Proceedings of the 2022 International Conference on Robotics and Automation, 2022
Proceedings of the IEEE International Conference on Networking, Sensing and Control, 2022
Proceedings of the Intelligent Robotics and Applications - 15th International Conference, 2022
Proceedings of the Artificial Neural Networks and Machine Learning - ICANN 2022, 2022
Authenticity Identification of Qi Baishi's Shrimp Painting with Dynamic Token Enhanced Visual Transformer.
Proceedings of the Advances in Computer Graphics, 2022
Proceedings of the 35th IEEE International Symposium on Computer-Based Medical Systems, 2022
Proceedings of the IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2022
2021
A High Input Voltage Auxiliary Power Supply Utilizing Automatic Balanced MOSFET Stack.
IEEE Trans. Ind. Electron., 2021
A Novel Three-Level CLLC Resonant DC-DC Converter for Bidirectional EV Charger in DC Microgrids.
IEEE Trans. Ind. Electron., 2021
Stability Analysis and Improvement for SSCB With Single-Gate Controlled Series-Connected SiC MOSFETs.
IEEE Trans. Ind. Electron., 2021
A Three-Dimensional Boundary-Dependent Compact Thermal Network Model for IGBT Modules in New Energy Vehicles.
IEEE Trans. Ind. Electron., 2021
Structure-Controlled Variable Stiffness Robotic Joint Based on Multiple Rotary Flexure Hinges.
IEEE Trans. Ind. Electron., 2021
Two-Degree-of-Freedom WPT System Using Cylindrical-Joint Structure for Applications With Movable Parts.
IEEE Trans. Circuits Syst. II Express Briefs, 2021
DM Interference Propagation Mathematical Modeling in SiC Wirebond Multichip Power Module.
IEEE Trans. Circuits Syst. II Express Briefs, 2021
Accurate Modeling of the Effective Parasitic Parameters for the Laminated Busbar Connected With Paralleled SiC MOSFETs.
IEEE Trans. Circuits Syst. I Regul. Pap., 2021
An Adaptive Gaussian Process-Based Search for Stochastically Constrained Optimization via Simulation.
IEEE Trans Autom. Sci. Eng., 2021
Benefit Analysis of Low-Carbon Policy Mix Innovation Based on Consumer Perspective in Smart City.
Sci. Program., 2021
Multim. Tools Appl., 2021
The fruit classification algorithm based on the multi-optimization convolutional neural network.
Multim. Tools Appl., 2021
A Hyperspectral Image Classification Approach Based on Feature Fusion and Multi-Layered Gradient Boosting Decision Trees.
Entropy, 2021
CoRR, 2021
IEEE Access, 2021
Person Re-Identification Based on Partition Adaptive Network Structure and Channel Partition Weight Adaptive.
IEEE Access, 2021
Proceedings of the Knowledge Science, Engineering and Management, 2021
Proceedings of the International Joint Conference on Neural Networks, 2021
Proceedings of the IEEE International Conference on Robotics and Automation, 2021
Learning How to Zoom In: Weakly Supervised ROI-Based-DAM for Fine-Grained Visual Classification.
Proceedings of the Artificial Neural Networks and Machine Learning - ICANN 2021, 2021
Proceedings of the IEEE International Conference on Bioinformatics and Biomedicine, 2021
Proceedings of the 3rd International Workshop on Experience with SQuaRE Series and Its Future Direction (IWESQ 2021) co-located with 28th Asia-Pacific Software Engineering Conference (APSEC 2021), 2021
Proceedings of the 19th IEEE/ACIS International Conference on Computer and Information Science, 2021
2020
Beamforming Optimization for Intelligent Reflecting Surface Assisted MIMO: A Sum-Path-Gain Maximization Approach.
IEEE Wirel. Commun. Lett., 2020
RBFNN-Based Adaptive Sliding Mode Control Design for Delayed Nonlinear Multilateral Telerobotic System With Cooperative Manipulation.
IEEE Trans. Ind. Informatics, 2020
Sci. Program., 2020
A Graphical Programming Language and Its Supporting Tool for Insect Intelligent Building.
Sci. Program., 2020
Touch: A Textual Programming Language for Developing APPs of Insect Intelligent Building.
Sci. Program., 2020
Nano Commun. Networks, 2020
J. Medical Imaging Health Informatics, 2020
J. Circuits Syst. Comput., 2020
A new medical staff allocation via simulation optimisation for an emergency department in Hong Kong.
Int. J. Prod. Res., 2020
Joint Hardware Design and Capacity Analysis for Intelligent Reflecting Surface Enabled Terahertz MIMO Communications.
CoRR, 2020
A biological plausible audio-visual integration model for continual lifelong learning.
CoRR, 2020
Instance Segmentation and Classification Method for Plant Leaf Images Based on ISC-MRCNN and APS-DCCNN.
IEEE Access, 2020
A New Topology of Switched-Capacitor Multilevel Inverter With Eliminating Leakage Current.
IEEE Access, 2020
IEEE Access, 2020
Joint Channel Estimation and Data Rate Maximization for Intelligent Reflecting Surface Assisted Terahertz MIMO Communication Systems.
IEEE Access, 2020
A Multi-Cell 21-Level Hybrid Multilevel Inverter Synthesizes a Reduced Number of Components With Voltage Boosting Property.
IEEE Access, 2020
Coherent OTDR Using Flexible All-Digital Orthogonal Phase Code Pulse for Distributed Sensing.
IEEE Access, 2020
Taylor Expansion Aided Gradient Descent Schemes for IRS-Enabled Terahertz MIMO Systems.
Proceedings of the 2020 IEEE Wireless Communications and Networking Conference Workshops, 2020
An Energy-aware Greedy Heuristic for Multi-objective Optimization in Fog-Cloud Computing System.
Proceedings of the 2020 IEEE International Conference on Systems, Man, and Cybernetics, 2020
Detection and Segmentation of Graphical Elements on GUIs for Mobile Apps Based on Deep Learning.
Proceedings of the Mobile Computing, Applications, and Services, 2020
Grasping Detection Network with Uncertainty Estimation for Confidence-Driven Semi-Supervised Domain Adaptation.
Proceedings of the IEEE/RSJ International Conference on Intelligent Robots and Systems, 2020
Proceedings of the Human Interaction, Emerging Technologies and Future Applications II - Proceedings of the 2nd International Conference on Human Interaction and Emerging Technologies: Future Applications (IHIET, 2020
Proceedings of the 2020 IEEE International Conference on Robotics and Automation, 2020
Proceedings of the 15th International Conference on Computer Science & Education, 2020
Channel Estimation for Intelligent Reflecting Surface Enabled Terahertz MIMO Systems.
Proceedings of the 2020 IEEE International Conference on Communications Workshops, 2020
Double Closed Loop Controller with Current Sharing of Interleaved DC/DC Converter for Dynamic Wireless Power Transfer System.
Proceedings of the 16th International Conference on Control, 2020
Parallel Implementation of H.265 Intra-Frame Coding Based on FPGA Heterogeneous Platform.
Proceedings of the 22nd IEEE International Conference on High Performance Computing and Communications; 18th IEEE International Conference on Smart City; 6th IEEE International Conference on Data Science and Systems, 2020
2019
A Friendly and Low-Cost Technique for Capturing Non-Cooperative Civilian Unmanned Aerial Vehicles.
IEEE Netw., 2019
J. Circuits Syst. Comput., 2019
A Three-Level Dual-Active-Bridge Converter With Blocking Capacitors for Bidirectional Electric Vehicle Charger.
IEEE Access, 2019
Modeling of Acoustic Emission Generated by Filter Capacitors in HVDC Converter Station.
IEEE Access, 2019
Economic Dispatch of Grid-Connected Microgrid for Smart Building Considering the Impact of Air Temperature.
IEEE Access, 2019
A Multi-Function Common Mode Choke Based on Active CM EMI Filters for AC/DC Power Converters.
IEEE Access, 2019
Real-time Image Enhancement for Vision-based Autonomous Underwater Vehicle Navigation in Murky Waters.
Proceedings of the WUWNET'19: International Conference on Underwater Networks & Systems, 2019
Flexure-Based Variable Stiffness Gripper for Large-Scale Grasping Force Regulation with Vision.
Proceedings of the Intelligent Robotics and Applications - 12th International Conference, 2019
Proceedings of the 2019 IEEE/CIC International Conference on Communications in China, 2019
Proceedings of the 2019 IEEE/CIC International Conference on Communications in China, 2019
Sum-rate Maximization for Intelligent Reflecting Surface Based Terahertz Communication Systems.
Proceedings of the 2019 IEEE/CIC International Conference on Communications in China, 2019
Low Complexity Beam Selection Scheme for Terahertz Systems: A Machine Learning Approach.
Proceedings of the 17th IEEE International Conference on Communications Workshops, 2019
Proceedings of the 2019 IEEE Globecom Workshops, Waikoloa, HI, USA, December 9-13, 2019, 2019
Design of a Compact Rotary Series Elastic Actuator with Nonlinear Stiffness for Lower Limb Exoskeletons.
Proceedings of the IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2019
2018
IEEE Trans Autom. Sci. Eng., 2018
IEICE Trans. Inf. Syst., 2018
Proceedings of the 2018 IEEE International Conference on Software Testing, 2018
Proceedings of the Eleventh International Conference on Machine Vision, 2018
Proceedings of the 5th IEEE International Conference on Cyber Security and Cloud Computing, 2018
Proceedings of the 11th International Congress on Image and Signal Processing, 2018
2017
Voltage Suppression in Wire-Bond-Based Multichip Phase-Leg SiC MOSFET Module Using Adjacent Decoupling Concept.
IEEE Trans. Ind. Electron., 2017
A Compact Gate Control and Voltage-Balancing Circuit for Series-Connected SiC MOSFETs and Its Application in a DC Breaker.
IEEE Trans. Ind. Electron., 2017
Frontiers Inf. Technol. Electron. Eng., 2017
J. Adv. Comput. Intell. Intell. Informatics, 2017
A Load-Balancing Energy Consumption Minimization Scheme in 5G Heterogeneous Small Cell Wireless Networks Under Coverage Probability Analysis.
Int. J. Pattern Recognit. Artif. Intell., 2017
Proceedings of the Advances in Swarm Intelligence - 8th International Conference, 2017
Optimization design of a bionic lower limb rehabilitation robot with dynamic analysis.
Proceedings of the 2017 IEEE International Conference on Robotics and Biomimetics, 2017
Reduction of common-mode interference under different working modes of induction machine based on improved predictive torque control method.
Proceedings of the IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, Beijing, China, October 29, 2017
Design of a structure-controlled variable stiffness actuator based on rotary flexure hinges.
Proceedings of the 2017 IEEE International Conference on Robotics and Automation, 2017
Proceedings of the Algorithms and Architectures for Parallel Processing, 2017
Proceedings of the 41st IEEE Annual Computer Software and Applications Conference, 2017
Proceedings of the 19th International ACM SIGACCESS Conference on Computers and Accessibility, 2017
Proceedings of the 24th Asia-Pacific Software Engineering Conference, 2017
2016
ACM Trans. Archit. Code Optim., 2016
A GPR-PSO incremental regression framework on GPS/INS integration for vehicle localization under urban environment.
Proceedings of the 27th IEEE Annual International Symposium on Personal, 2016
Resource allocation via hierarchical clustering in dense small cell networks: A correlated equilibrium approach.
Proceedings of the 27th IEEE Annual International Symposium on Personal, 2016
Unsupervised and Semi-supervised Dimensionality Reduction with Self-Organizing Incremental Neural Network and Graph Similarity Constraints.
Proceedings of the Advances in Knowledge Discovery and Data Mining, 2016
Robotic manipulation of deformable objects by tangent space mapping and non-rigid registration.
Proceedings of the 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2016
Mixed initiative controller for simultaneous intervention, a model predictive control formulation.
Proceedings of the 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2016
Proceedings of the 22nd IEEE International Conference on Parallel and Distributed Systems, 2016
An aerostatic bearing device with arrayed restrictors for roll-to-roll printed electronics.
Proceedings of the 14th International Conference on Control, 2016
Proceedings of the 15th European Control Conference, 2016
A temporal self-organizing neural network for adaptive sub-sequence clustering and case studies.
Proceedings of the International Conference on Computer, 2016
On mitigating interference under device-to-device communication in macro-small cell networks.
Proceedings of the International Conference on Computer, 2016
Proceedings of the International Conference on Computer, 2016
Proceedings of the 55th IEEE Conference on Decision and Control, 2016
Proceedings of the IEEE International Conference on Automation Science and Engineering, 2016
Autonomous alignment of peg and hole by force/torque measurement for robotic assembly.
Proceedings of the IEEE International Conference on Automation Science and Engineering, 2016
Proceedings of the 2016 American Control Conference, 2016
Proceedings of the IEEE International Conference on Advanced Intelligent Mechatronics, 2016
2015
Dual-Stage Adaptive Friction Compensation for Precise Load Side Position Tracking of Indirect Drive Mechanisms.
IEEE Trans. Control. Syst. Technol., 2015
Photonic Netw. Commun., 2015
GRASP v2.0: an update on the Genome-Wide Repository of Associations between SNPs and phenotypes.
Nucleic Acids Res., 2015
Image classification based on support vector machine and the fusion of complementary features.
CoRR, 2015
Proceedings of the 2015 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2015
Proceedings of the Algorithms and Architectures for Parallel Processing, 2015
Design and torque-mode control of a cable-driven rotary series elastic actuator for subject-robot interaction.
Proceedings of the IEEE International Conference on Advanced Intelligent Mechatronics, 2015
2014
IEEE Trans. Ind. Electron., 2014
Dual-Stage Iterative Learning Control for MIMO Mismatched System With Application to Robots With Joint Elasticity.
IEEE Trans. Control. Syst. Technol., 2014
Robotica, 2014
Kinematic design and analysis for a macaque upper-limb exoskeleton with shoulder joint alignment.
Proceedings of the 2014 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2014
Design of a force-decoupled compound parallel alignment stage for high-resolution imprint lithography.
Proceedings of the 2014 IEEE International Conference on Robotics and Automation, 2014
Proceedings of the International Conference on Connected Vehicles and Expo, 2014
Proceedings of the 13th International Conference on Control Automation Robotics & Vision, 2014
Proceedings of the IEEE 3rd International Conference on Cloud Computing and Intelligence Systems, 2014
2013
Sci. China Inf. Sci., 2013
Proceedings of the IECON 2013, 2013
Proceedings of the 9th Asian Control Conference, 2013
Iterative learning control for vibration reduction in industrial robots with link flexibility.
Proceedings of the American Control Conference, 2013
On the time-optimal trajectory planning and control of robotic manipulators along predefined paths.
Proceedings of the American Control Conference, 2013
Design, modeling, and simulation of a 2-DOF microgripper for grasping and rotating of optical fibers.
Proceedings of the 2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2013
Dynamic analysis of the demolding process for PDMS microstructures with high aspect ratio.
Proceedings of the 2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2013
Proceedings of the 2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2013
2012
An Architecture and a MAC Protocol for Throughput Improvement in Light Trail Networks.
IEICE Trans. Commun., 2012
Design and analysis of a new flexure-based XY micropositioning stage with decoupled motion characteristic.
Proceedings of the 2012 IEEE International Conference on Robotics and Biomimetics, 2012
Design of an aerostatic imprint head with off-plane alignment functionality for nanoimprint lithography.
Proceedings of the 2012 IEEE International Conference on Robotics and Biomimetics, 2012
Proceedings of the IEEE International Conference on Robotics and Automation, 2012
2011
IEEE Trans. Ind. Electron., 2011
Proceedings of the Global Communications Conference, 2011
2010
Spline-interpolation based PVT algorithm and application in a bionic cockroach robot.
Proceedings of the 11th International Conference on Control, 2010
Intuitive robot tool path teaching using laser and camera in Augmented Reality environment.
Proceedings of the 11th International Conference on Control, 2010
Proceedings of the 11th International Conference on Control, 2010
Estimation of load side position in indirect drive robots by sensor fusion and kalman filtering.
Proceedings of the American Control Conference, 2010
2009
J. Circuits Syst. Comput., 2009
2008
IEEE Trans Autom. Sci. Eng., 2008
2007
Analysis of Insertion Loss and Impedance Compatibility of Hybrid EMI Filter Based on Equivalent Circuit Model.
IEEE Trans. Ind. Electron., 2007
2006
Proceedings of the Interdisciplinary and Multidisciplinary Research in Computer Science, 2006
2005
Proceedings of the 34th International Conference on Parallel Processing Workshops (ICPP 2005 Workshops), 2005
An Intelligent Guiding and Controlling System for Transportation Network Based on Wireless Sensor Network Technology.
Proceedings of the Fifth International Conference on Computer and Information Technology (CIT 2005), 2005
Proceedings of the Fifth International Conference on Computer and Information Technology (CIT 2005), 2005
2004
Proceedings of the 2004 IEEE Conference on Robotics, Automation and Mechatronics, 2004
Proceedings of the 8th International Conference on Control, 2004
1999
Adaptive gait planning for multi-legged robots with an adjustment of center-of-gravity.
Robotica, 1999