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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： B. Smolka M. Szczepanski R. Lukac A.N. Venetsanoloulos Department of Automatic Control Silesian University of Technology Gliwice Poland The Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada

The rapid growth of image archives increases the need for efficient and fast tools that can retrieve and search through a large amount of visual data. In this paper, we propose an efficient method of extracting the image color content, which serves as an image digital signature, allowing us to efficiently index and retrieve the content of large, heterogeneous multimedia Internet based databases. We apply the proposed method for the retrieval of images from the WEBMUSEUM Internet database, containing a collection of fine art images and show that the new method of image color representation is robust to image distorsions caused by resizing and compression and can be incorporated into existing retrieval systems which exploit the information on color content in digital images.

关键词： Robustness Color Image retrieval Web sites Information retrieval Content based retrieval Multimedia databases Internet Image databases Data mining

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Optimum Algebraic Design of Continuous-Time Regulators with Polyhedral Constraints

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IFAC Proceedings Volumes 1989年第6期22卷 291-294页

作者： M. Vassilaki G. Bitsoris AMBER S.A.Computer Systems POB3500 Athens.Greece Control Systems Laboratory.Electrical Engineering Department University of patras 26500 Patras Greere

In this paper, the Linear Constrained Regulation Problem for continuous-time systems will be studied and a design algorithm for a linear constrained feedback controller will be developed. Both state and control vectors are assumed to be subjected to linear constraints The approach presented, is based on the notion of positive invariance of polyhedral sets. Existence conditions for a control law that transfers asymptotically to the origin all initial states in a polyhedral subset of the state space is formulated. Then, a solution to the LCRP is derived solving a non-linear optimization problem

关键词： Linear systems stability positively invariant sets optimisation

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Communication beyond (N)acks: wireless transmission with informative feedback

Communication beyond (N)acks: wireless transmission with inf...

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Annual IEEE Student Paper Conference

作者： Brian A. Mertz Janus Heide Jesper H. Sorensen Rasmus Krigslund Simon J.K. Pedersen Department of Control Engineering University of Aalborg Denmark Department of Communication Systems University of Aalborg Denmark Department of Computer Vision University of Aalborg Denmark

ISBN: (纸本)9781424421558;1424421551

This paper introduces a scheme for improved data transmission in wireless links. The idea of the proposed scheme is to limit the amount of retransmitted data in case of errors, by using informative feedback instead of the traditionally used binary (ACK or NACK) feedback. The performance of the proposed scheme is assessed and compared to a protocol stack incorporating regular retransmission, in order to determine whether the idea of informative feedback has a potential. The estimation shows a significant improvement in goodput, when the error rate of the communication channel varies from 10 -6 to 10 -3 . Software that implements the proposed scheme is made, and tests are performed in order to verify the estimations. The tests show a significant performance increase, and based on the results it is concluded, that informative feedback in communication protocols has a noticeable potential.

关键词： Wireless communication Feedback Transmitters Error correction Protocols automatic repeat request Error analysis Testing Forward error correction Intelligent sensors

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A Virtual and Remote Lab of the Two Electric Coupled Drives System in the University Network of Interactive Laboratories

A Virtual and Remote Lab of the Two Electric Coupled Drives ...

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American control Conference

作者： Jacobo Saenz Jesus Chacon Luis de la Torre Antonio Visioli Sebastian Dormido Department of Computer Science and Automatic Control Computer Science School UNED Juan del Rosal 16 Madrid Spain Department of Mechanical and Industrial Engineering University of Brescia Via Branze 38 Brescia Italy

ISBN: (纸本)9781479917730

This paper describes all the details on the latest addition to the University Network of Interactive Laboratories: a virtual and a remote laboratory of a two electric coupled drives system. This two new activities allow performing control practices in a 2×2 MIMO system. The virtual and the remote labs are accessible for anyone in a new open course that contains several other experiments in the automatic control field.

关键词： Remote laboratories control Methods automatic control multiple input multiple output systems Virtual Interactive Electricity Remote universities

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Real-Time Four-Dimensional Trajectory Generation Based on Gain-Scheduling control and a High-Fidelity Aircraft Model

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engineering 2021年第4期7卷 495-506页

作者： Olusayo Obajemu Mahdi Mahfouf Lohithaksha M.Maiyar Abrar Al-Hzndi Michal Weiszer Jun Chen Department of Automatic Control and Systems Engineering The University of SheffieldSheffield S14DWUK Business and Management Research Institute University of BedfordshireLuton LU13JUUK School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK

Aircraft ground movement plays a key role in improving airport efficiency,as it acts as a link to all other ground *** novel approaches to coordinate the movements of a fleet of aircraft at an airport in order to improve system resilience to disruptions with increasing autonomy is at the center of many key studies for airport airside ***,autonomous taxiing is envisioned as a key component in future digitalized ***,state-of-the-art routing and scheduling algorithms for airport ground movements do not consider high-fidelity aircraft models at both the proactive and reactive planning *** majority of such algorithms do not actively seek to optimize fuel efficiency and reduce harmful greenhouse gas *** paper proposes a new approach for generating efficient four-dimensional trajectories(4DTs)on the basis of a high-fidelity aircraft model and gainscheduling control *** in conjunction with a routing and scheduling algorithm that determines the taxi route,waypoints,and time deadlines,the proposed approach generates fuel-efficient 4DTs in real time,while respecting operational *** proposed approach can be used in two contexts:①as a reactive decision support tool to generate new trajectories that can resolve unprecedented events;and②as an autopilot system for both partial and fully autonomous *** proposed methodology is realistic and simple to ***,simulation studies show that the proposed approach is capable of providing an up to 11%reduction in the fuel consumed during the taxiing of a large Boeing 747-100 jumbo jet.

关键词： Aircraft model Intelligent taxiing Optimization Four-dimensional trajectory

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Implementation of Industrial Robot Force control Case Study: High Power Stub Grinding and Deburring

Implementation of Industrial Robot Force Control Case Study:...

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2006 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： A. Robertsson T. Olsson R. Johansson A. Blomdell K. Nilsson M. Haage B. Lauwers H. De Baerdemaeker T. Brogardh H. Brantmark Department of Automatic Control Lund University Hospital Lund Sweden Dept. of Automatic Control Lund University Sweden Dept. of Computer Science Lund University Sweden Department of Computer Science Lund University Hospital Lund Sweden Dept. of Mechanical Engineering Faculty of Engineering Heverlee Belgium Department of Mechanical Engineering Heverlee Belgium ABB Automation Technologies - Robotics Västerås Sweden

In this paper, the results from a joint industry-academia project in industrial robotic force control are presented. The extension and implementation of an external sensor system for an industrial robot system, which can be used for high-bandwidth force control, are described. Results from two industrial applications using the system are presented, a stub grinding application using a new compliant grinding end-effector integrated with the robot control system, and a deburring application with a stiff tool requiring high-bandwidth force control in six degrees of freedom. Using the system an easily reconfigurable control structure was achieved, which was able to control contact forces with a sampling bandwidth of an order of magnitude higher than for conventional robot controllers

关键词： Industrial control Service robots Force control Deburring Electrical equipment industry Robot sensing systems control systems Robot control Sensor systems Sampling methods

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Stochastic communication protocols for multi-agent consensus under jamming attacks

Stochastic communication protocols for multi-agent consensus...

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IEEE Annual Conference on Decision and control

作者： Kaito Kikuchi Ahmet Cetinkaya Tomohisa Hayakawa Hideaki Ishii Department of Systems and Control Engineering Tokyo Institute of Technology Tokyo Japan Department of Computer Science Tokyo Insitute of Technology Yokohama Japan

A consensus problem for multi-agent systems under jamming attacks is considered. Specifically, the agents are assumed to communicate over a shared network, where transmissions may fail at certain times due to jamming. We propose stochastic communication protocols so that the agents attempt to communicate with each other at random time instants that are unknown by the attacker. We obtain sufficient finite-time practical consensus conditions. Through a probabilistic analysis, we show that our communication protocols allow consensus under a class of attacks that were previously not considered. We demonstrate the efficacy of our results by considering two different strategies of the attacker: a deterministic attack strategy and a more malicious communication-aware strategy.

关键词： Jamming Protocols Multi-agent systems Probabilistic logic Communication system security Wireless communication Turning

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DMOC approach of real-time trajectory generation for mechanical systems

DMOC approach of real-time trajectory generation for mechani...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Weizhong Zhang Tamer Inanc Jerrold E. Marsden Department of Electrical and Computer Engineering University of Louisville Louisville USA Department of Control and Dynamical Systems California Institute of Technology Pasadena USA

Discrete mechanics and optimal control (DMOC) is newly developed methodology to solve the optimal control problems of mechanical systems. It is based on a direct discretization of the Lagrange-d'Alembert principle. The constraints are modeled as Euler-Langrange equations for discrete states. With the application of DMOC, a new real-time trajectory generation approach is proposed. The formulated problem is solved in the open source free nonlinear programming solver IPOPT (interior point optimizer). Superior performance of DMOC is verified through a standard forced VanDerPol oscillator example. It is shown DMOC is much faster than NTG (nonlinear trajectory generation) in computation time, it is 1.31% of the CPU time. Finally, for real-time trajectory generation, a dynamical glider example is shown as one of its possible application fields.

关键词： Real time systems Mechanical systems Optimal control Cost function control systems Robotics and automation Lagrangian functions Equations Robot programming automatic generation control

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Minimum power scheduling under rician fading in full-duplex relay-assisted D2D communication

Minimum power scheduling under rician fading in full-duplex ...

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2017 IEEE Global Telecommunications Conference, GC 2017

作者： Penda, Demia Della Nomikos, Nikolaos Charalambous, Themistoklis Johansson, Mikael Department of Automatic Control KTH-Royal Institute of Technology Stockholm Sweden Department of Information and Communication Systems Engineering University of the Aegean Samos Greece Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Espoo Finland

ISBN: (纸本)9781538639207

In cellular systems, the combination of Device-to- Device (D2D) communication and relaying is an efficient means for improving network coverage and transmissions quality without additional infrastructure deployment. It enables communication between user pairs in situations when both their direct D2D transmission and the traditional communication via the base station experience poor channel quality. In this paper, we propose a joint relaying-operation selection and power-allocation scheme, herein called HyD2D, for relay-assisted D2D communication in Rician fading environment. The target is to choose the set of communication links that minimizes the power consumption, while ensuring a minimum success probability. To overcome the nonconvexity of the outage probability constraints under Rician fading, we use the concept of coherent-measure- of-risk from the field of finance. We therefore obtain a linear programming formulation that we can efficiently solve. Simulations show that HyD2D selects the most energy- efficient relaying operation that satisfies the success probability requirement, while leveraging only statistical channel state information. © 2017 IEEE.

关键词： Energy efficiency

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A domain web data standardization organization method

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Information Technology Journal 2013年第22期12卷 6710-6716页

作者： Rui, Cao Rui, Wang Li-Yun, Hao Ling-Da, Wu Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment Beijing 101416 China Department of Automatic Control and Systems Engineering University of Sheffield Sheffield SI 4DT United Kingdom Department of Systems Engineering College of Information Systems and Management National University of Defense Technology Changsha 410073 China

In order to enable the Web data to be applied in a non-Internet environment, overcoming the timeliness of Web data, this study proposes a domain Web data standardization organization method. The domain Web standardization organization framework is established and the acquired data are divided into three categories: Structured, un-structured and semi-structured. With respect to the semi-structured data within an implicit scheme, we use a rational code design to transform semi-structured data into structured data. Combining file system and relational database, a standardization organization method is established for the three types of data. Experimental results show that this method is effective and efficient. ©2013 Asian Network for Scientific Information.

关键词： Standardization

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