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作者： Ribeiro, Tiago T. Conceição, André G.S. Sa, Inkyu Corke, Peter LaR - Robotics Laboratory Department of Electrical Engineering Federal University of Bahia Salvador Brazil Australian Centre for Robotic Vision School of Electrical Engineering and Computer Science Queensland University of Technology Australia

This paper presents a Nonlinear Model Predictive Formation Control for a group of Quadcopters. In this approach the controllers are distributed to the quadcopters and the coupling is done through its objective function. The path following problem is expressed through a dynamic model of the quadcopter's state errors relative to a Serret-Frenet frame, and the coordination problem is solved through adjustments in the robots' speeds combined with the path update rate for each robot. A strategy based on constraints relaxing is proposed to solve the problem of high state and formation errors, factors that directly affect feasibility and stability. Simulation results considering a realistic scenario are provided to demonstrate the performance of the proposed control strategy. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Adaptive extended Kalman filter for a red shift navigation system 34

Adaptive extended Kalman filter for a red shift navigation s...

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34th Chinese Control Conference, CCC 2015

作者： Fu, Kui Zhang, Dan Tang, Peng Tang, Zhongliang He, Wei School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Computer Science Department Stony Brook University and SUNY KoreaIncheon 406-840 United States Center for Robotics University of Electronic Science and Technology of China Chengdu611731 China

ISBN: (纸本)9789881563897

In this paper, a navigation system based on red shift for spacecraft mission in solar system is implemented. Deep space environment is complex and changeable, its characteristics are hard to handle, there exist difficulties to simulate the deep space environment accurately. We know that red shift navigation system can achieve high navigation accuracy in deep space missions. And innovation-based adaptive estimation(IAE) can utilize latest measurement to adaptive adjust the covariance matrix of observation equations and state error covariance matrix. Using IAE method, we proposed a new adaptive filter to handle variable deep space environment. Employing adaptive extended Kalman filter (AEKF) in this system, the navigation performance is analysed. Simulation results indicate that the proposed navigation system using AEKF can achieve higher precision, better availability and continuity compared with conventional extended Kalman filter (EKF), but greater computational burden. © 2015 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Adaptive filtering

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Active tactile object exploration with Gaussian processes

Active tactile object exploration with Gaussian processes

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Zhengkun Yi Roberto Calandra Filipe Veiga Herke van Hoof Tucker Hermans Yilei Zhang Jan Peters Intelligent Autonomous Systems Lab Department of Computer Science Technische Universitat Darmstadt Hochschulstr. 10 64289 Germany School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 University of Utah Robotics Center School of Computing University of Utah USA

ISBN: (纸本)9781509037636

Accurate object shape knowledge provides important information for performing stable grasping and dexterous manipulation. When modeling an object using tactile sensors, touching the object surface at a fixed grid of points can be sample inefficient. In this paper, we present an active touch strategy to efficiently reduce the surface geometry uncertainty by leveraging a probabilistic representation of object surface. In particular, we model the object surface using a Gaussian process and use the associated uncertainty information to efficiently determine the next point to explore. We validate the resulting method for tactile object surface modeling using a real robot to reconstruct multiple, complex object surfaces.

关键词： Gaussian processes Touch tactile sensors grid point

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Powered Upper-Limb Control using Passivity-Based Nonlinear Disturbance Observer for Unknown Payload Carrying Applications

Powered Upper-Limb Control using Passivity-Based Nonlinear D...

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IEEE International Conference on robotics and Automation

作者： Min Jun Kim Woongyong Lee Jae Yeon Choi Yong Sik Park Sung Ho Park Goobong Chung Kyung-Lyong Han I1 Seop Choi I1 Hong Suh Youngjin Choi Wan Kyun Chung the Robotics Laboratory School of Mechanical Engineering Pohang University of Science and Technology (POSTECH) Pohang 790-784 Gyung-buk Korea the Korea Institute of Robot and Convergence (KIRO) Pohang 790-784 Gyung-buk Korea the POSCO Technical Research Laboratories Pohang 790-300 Gyung-buk Korea the Department of Electronics and Computer Engineering Hanyang University Seoul Korea the Department of Electronic Systems Engineering Hanyang University Ansan Korea

ISBN: (纸本)9781467380270

This paper proposes a passivity-based nonlinear disturbance observer (DOB) design for a powered upper-limb robot control. The proposed DOB allows for the nonlinearities of the robot dynamics, whereas the typical DOB designs cannot. Moreover, by virtue of the passivity property, human operator and environmental interactions can be embedded in the control loop. As a DOB, the proposed approach has a disturbance observation property that makes the actual robot behave like a nominal model selected by the user. Performance analysis proposes a gain tuning rule. In experimental validation, actual powered upper-limb robot is used to perform unknown payload carrying applications.

关键词： Observer Unknown DOB

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Effects of carbon dioxide on different PSK modulation formats of Optical Wireless Communications using USRP

Effects of carbon dioxide on different PSK modulation format...

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International Conference on Transparent Optical Networks

作者： Jan Vitasek Radek Martinek Ales Vanderka Lukas Hajek Jan Latal Zhenli Lu Bin Li Department of Telecommunications VSB-Technical University of Ostrava Ostrava Czech Republic Department of Cybernetics and Biomedical Engineering VSB-Technical University of Ostrava Ostrava Czech Republic Department of Telecommunications Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava 17. listopadu 15 708 33 Czech Republic State key Laboratoryof Robotics Chinese Academy of Sciences Shenyang China School of Electrical Engineering and Automation Changshu Instituteof Technology Changshu China

ISBN: (纸本)9781509014682

This article explores the influence of the concentrated carbon dioxide (CO 2 ) gas on the different Phase Shift Keying (PSK) modulations used for Optical Wireless Communication (OWC) links. In this work, the OWC consisted of a laser diode, a photodetector, and a transmission medium. The Universal Software Radio Peripheral (USRP) unit created and evaluated the PSK modulations. This unit modulated the laser diode on the transmitter side and demodulated the data which were received by the photodetector on the receiver side. The CO 2 gas was emitted as a consequence of sublimation of the solid carbon dioxide in hot water. The measurements were done in a closed box in laboratory. The CO 2 gas is a one element of smog which pollutes cities now and then. Our experimental results with CO 2 gas could help to choose a suitable modulation scheme for OWC which are installed in cities with smog-polluted atmospheric conditions.

关键词： Phase shift keying Carbon dioxide Optical receivers Diode lasers Integrated optics Optical transmitters

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User-adapted Web of things for accessibility 15

User-adapted Web of things for accessibility

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26th ACM Conference on Hypertext and Social Media, HT 2015

作者： Torre, Ilaria Celik, Ilknur Department of Computer Science Bioengineering Robotics and Systems Engineering University of Genoa Viale Causa 13 Italy Computer Education and Instructional Technology Middle East Technical University Northern Cyprus Campus Guzelyurt Mersin 10 Turkey

ISBN: (纸本)9781450333955

This paper describes a new wave of the Web that is the user-adapted Web of Things. This is a new step in the evolution of the Web of Things and of adaptive web-based systems. The current proposals for the Web of Things focus on the augmentation of the physical objects in order to provide enhanced services. However, in our view, the Web of Things can also be a means to make physical objects accessible or more usable for people with special needs by exploiting adaptive and semantic techniques. The architecture presented in the paper describes the specific modules and components at the basis of this approach.

关键词： Linked data

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Transient Electronics: Dry Transient Electronic Systems by Use of Materials that Sublime (Adv. Funct. Mater. 12/2017)

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Advanced Functional Materials 2017年第12期27卷

作者： Bong Hoon Kim Jae‐Hwan Kim Luana Persano Suk‐Won Hwang Seungmin Lee Jungyup Lee Yongjoon Yu Yongseon Kang Sang M. Won Jahyun Koo Youn Kyoung Cho Gyum Hur Anthony Banks Jun‐Kyul Song Phillip Won Young Min Song Kyung‐In Jang Daeshik Kang Chi Hwan Lee Dario Pisignano John A. Rogers Departments of Materials Science and Engineering Biomedical Engineering Chemistry Neurological Surgery Mechanical Engineering Electrical Engineering and Computer Science Simpson Querrey Institute and Feinberg Medical School Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA NEST Istituto Nanoscienze‐CNR Piazza S. Silvestro 12 I‐56127 Pisa Italy KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea Department of Mechanical Engineering Ajou University Suwon 443–749 Republic of Korea Weldon School of Biomedical Engineering School of Mechanical Engineering The Center for Implantable Devices and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USA Dipartimento di Matematica e Fisica “Ennio De Giorgi” Università del Salento Via Arnesano I‐73100 Lecce Italy

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Distributed state estimation for linear multi-agent systems with time-varying measurement topology

Distributed state estimation for linear multi-agent systems ...

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作者： Viegas, Daniel Batista, Pedro Oliveira, Paulo Silvestre, Carlos Philip Chen, C.L. Institute for Systems and Robotics Instituto Superior Técnico Av. Rovisco Pais Lisboa1049-001 Portugal Department of Mechanical Engineering Instituto Superior Técnico Universidade de Lisboa Lisboa Portugal Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Taipa China Department of Computer and Information Science Faculty of Science and Technology University of Macau Taipa China

This paper addresses the problem of distributed state estimation in formations of vehicles with time-varying measurement topology. One or more vehicles have access to measurements of their own state, while the rest must rely on measurements relative to other vehicles in the vicinity and limited communication to estimate their own state, and it is assumed that the vehicles may gain or lose access to some measurements over time. The proposed solution consists in the implementation of a local state observer on-board each vehicle, and the effects of changes in the measurement topology on the estimation error dynamics are studied resorting to switched systems theory. Sufficient conditions for exponential stability of the global estimation error dynamics are presented for two different switching laws. The results are applied to the practical case of a formation of Autonomous Underwater Vehicles (AUVs), and simulation results are presented that validate the proposed solution. © 2015 Elsevier Ltd.

关键词： Multi agent systems

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Moth-inspired plume tracing via autonomous underwaer vehicle with only a pair of separated chemical sensors

Moth-inspired plume tracing via autonomous underwaer vehicle...

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MTS/IEEE Washington, OCEANS 2015

作者： Tian, Yu Li, Wei Zhang, Fumin State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China Department of Computer and Electrical Engineering and Computer Science California State University BakersfieldCA93311 United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States

ISBN: (纸本)9780933957435

Effective chemical plume tracing strategies are important for autonomous underwater vehicles (AUVs) to perform a variety of missions of searching for underwater targets, such as oil spill sources and deep-sea hydrothermal vents. In such circumstances where fluid flow direction cannot be measured by AUVs or fluid flow direction provides little or wrong information about the distribution of a dynamic chemical plume or its source location, chemical plume tracing strategies that rely on information of fluid flow direction may not work effectively. In this paper, a modified moth-inspired chemical plume tracing strategy is presented, which could trace a turbulent chemical plume without need of information of flow direction. The strategy estimates the direction of plume centerline based on information from a pair of spatially separated chemical sensors symmetrically mounted on an AUV's nose together with the AUV's zigzag plume-tracing trajectory, and employs the estimated direction of plume centerline to implement the plume tracing. The proposed strategy is implemented in a computer simulation environment and the simulation results demonstrate that with the strategy an AUV could track a turbulent chemical plume over a long distance and finally localize the plume source. © 2015 MTS.

关键词： Autonomous underwater vehicles

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3D Reconstruction from Image Sequence

3D Reconstruction from Image Sequence

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2015 International Conference on Software, Multimedia and Communication engineering(SMCE 2015)

作者： Ji-zhong LIU En-tao ZHENG Guang-hui WANG Cai-ying CHEN Institute of Robotics Nanchang University Department of Electrical Engineering and Computer Science University of Kansas

3D reconstruction based on images has advantages of low cost with simple equipment compared with other methods based on active equipment. It is an important research issue in computer vision. According to the number of images involved, 3D reconstruction methods can be broadly classified into multi-images reconstruction and single image reconstruction. The major reconstruction methods, principles, and latest progress of 3D reconstruction are introduced in the article. The advantages and disadvantages of these methods are also analyzed, aiming to provide a reference for the research in the field.

关键词： 3D reconstruction Image sequence Single image reconstruction Multi-images reconstruction

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