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7th German Conference on robotics, ROBOTIK 2012

作者： Ax, Markus Thamke, Stefan Kuhnert, Lars Schlemper, Jens Kuhnert, Klaus-Dieter University of Siegen Fak. IV - Electrical Engineering and Computer Science Institute for Real-Time Learning Systems Germany

Vertical Take-Off and Landing (VTOL) capable Mini Unmanned Aerial Vehicles (MUAV) are an economic alternative to real helicopters if local aerial pictures or other aerial measurements are needed. With electronic stabilization, GPS based position-hold and autonomous way-point functions these systems are easy to operate. While autonomous take off and flying are done routinely, this is not true for autonomous landing. GPS based position stabilization, in conjunction with the normally used cheap and small IMUs, is not accurate enough to avoid dangerous moves in the very last moment of the landing operation. While sufficient for an emergency landing this is not suitable as routine operation. In this paper a solution is presented which uses optical flow techniques for position stabilization in the moment just before the touch down to avoid the inaccuracies from the GPS at this critical moment. © 7th German Conference on robotics, ROBOTIK 2012

关键词： Stabilization

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Global Trajectory Tracking for a Class of Underactuated Vehicles

Global Trajectory Tracking for a Class of Underactuated Vehi...

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American Control Conference

作者： Pedro Casau Ricardo G. Sanfelice Rita Cunha David Cabecinhas Carlos Silvestre Department of Electrical Engineering and Computer Science and Institute for Robotics and Systems in Engineering and Science (LARSyS) Instituto Superior Técnico Universidade Técnica de Lisboa 1049-001 Lisboa Portugal Department of Aerospace and Mechanical Engineering University of Arizona 1130 N. Mountain Ave AZ 85721

ISBN: (纸本)9781479901777

In this paper, we address the problem of trajectory tracking for a class of underactuated vehicles with full torque actuation and only one dimensional force actuation (thrust). For this class of vehicles, the desired thrust is defined by a saturated control law that achieves global asymptotic stabilization of the position tracking error. The proposed control law also assures that the third component of the angular velocity is regulated to zero. To accomplish this task we propose a hybrid controller that is designed using backstepping techniques and recent developments on synergistic Lyapunov functions. Simulations validating the results are also provided.

关键词： position tracking error angular velocity is regulated to zero results are also provided trajectory tracking Location tracking vehicle peak torque Classes control law ANGULAR VELOCITY Activation thrust saturating control

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WCET-aware static locking of instruction caches 12

WCET-aware static locking of instruction caches

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10th International Symposium on Code Generation and Optimization, CGO 2012

作者： Plazar, Sascha Kleinsorge, Jan C. Marwedel, Peter Falk, Heiko Department of Computer Science 12 TU Dortmund University D-44221 Dortmund Germany Institute of Embedded Systems/Real-Time Systems Ulm University D-89081 Ulm Germany

ISBN: (纸本)9781605586359

In the past decades, embedded system designers moved from simple, predictable system designs towards complex systems equipped with caches. This step was necessary in order to bridge the increasingly growing gap between processor and memory system performance. Static analysis techniques had to be developed to allow the estimation of the cache behavior and an upper bound of the execution time of a program. This bound is called worst-case execution time (WCET). Its knowledge is crucial to verify whether hard real-time systems satisfy their timing constraints, and the WCET is a key parameter for the design of embedded systems. In this paper, we propose aWCET-aware optimization technique for static I-cache locking which improves a program's performance and predictability. To select the memory blocks to lock into the cache and avoid time consuming repetitive WCET analyses, we developed a new algorithm employing integer-linear programming (ILP). The ILP models the worst-case execution path (WCEP) of a program and takes the inuence of locked cache contents into account. By modeling the effect of locked memory blocks on the runtime of basic blocks, the overall WCET of a program can be minimized. We show that our optimization is able to reduce the estimated WCET (abbr. WCETest) of real-life benchmarks by up to 40.8%. At the same time, our proposed approach is able to outperform a regular cache by up to 23.8% in terms of WCETest. Copyright © 2012 ACM.

关键词： Embedded systems

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HRI Pioneers Workshop 2013 13

HRI Pioneers Workshop 2013

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ACM/IEEE International Conference on Human-Robot Interaction (HRI)

作者： Solace Shen Henny Admoni Caroline Harriott Yunkyung Kim Matt Marge Marynel Vázquez Astrid Rosenthal-von der Pütten Matt Beane Yasuhiko Hato Daniel Lazewatsky Robin Read Steve Vozar Department of Psychology University of Washington Seattle USA Department of Social Psychology University of Duisburg-Essen Duisburg Germany Department of Computer Science Yale University New Haven USA Sloan School of Management Massachusetts Institute of Technology Cambridge USA Department of Electrical Engineering & Computer Science Vanderbilt University Nashville USA Graduate School of Science & Technology Keio University Yokohama Japan Department of Industrial Design Korea Advanced Institute of Science and Technology Daejeon South Korea Industrial & Manufacturing Engineering Oregon State University Corvallis USA Language Technologies Institute Carnegie Mellon University Pittsburgh USA Centre for Robotics & Neural Systems University of Plymouth Plymouth UK Robotics Institute Carnegie Mellon University Pittsburgh USA Department of Mechanical Engineering University of Michigan Ann Arbor USA

ISBN: (纸本)9781467330558

The 2013 Human-Robot Interaction (HRI) Pioneers Workshop, which will be held in conjunction with the 8 th ACM/IEEE International Conference on Human-Robot Interaction, is the premiere venue for student research in the field. This highly selective workshop seeks to foster creativity, communication, and collaboration between the world's top student researchers in the field of human-robot interaction. Pioneers Workshop participants will have the opportunity to learn about the current state of HRI, to present their research, and to network with one another and with select senior researchers in a setting that is less formal and more interactive then the main conference. The theme for this year is Re-envisioning HRI: Dealing With the Elephants in Our Room. The workshop aims to bring forward difficult to discuss issues to help the field achieve more balanced perspectives and a clearer picture of what sort of future we are building.

关键词： Educational institutions Conferences Human-robot interaction Psychology computer science Service robots

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A new hand exoskeleton device for rehabilitation using a three-layered sliding spring mechanism

A new hand exoskeleton device for rehabilitation using a thr...

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IEEE International Conference on robotics and Automation

作者： Jumpei Arata Keiichi Ohmoto Roger Gassert Olivier Lambercy Hideo Fujimoto Ikuo Wada Department of Computer Science and Engineering Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Nagoya 466-8555 Japan. Rehabilitation Engineering Laboratory Institute of Robotics and Intelligent Systems ETH Zurich 8092 Zurich Switzerland. Department of Rehabilitation Nagoya City University Hospital 1-Kawasumi MIzuho-cho Mizuho-ku Nagoya 467-8602 Japan.

ISBN: (纸本)9781467356404

In this paper, a new hand exoskeleton device using a three-layered sliding spring mechanism is presented. In contrast to state of the art hand exoskeleton mechanisms (typically link, wire or pneumatically driven), the proposed mechanism is driven through large deformations of the compliant mechanism body. The mechanism can be made compact and lightweight by adequately positioning the compliant elements. In addition, the mechanism is designed to distribute 1-DOF actuated linear motion into three rotational motions of the finger joints, which translate into natural finger flexion/extension. The primary applicatoin of the proposed mechanism is to provide robotic support during physical therapy at the hospital (e.g. Continuous Passive Motion). However, thanks to its light and wearable structure, the proposed device could also be used at home as an assistive/therapeutic device to support activities of daily living. We introduce the mechanical structure of the three-layered sliding spring mechanism, present a prototype implementation as a hand exoskeleton device, and provide a preliminary evaluation.

关键词： three-layered sliding spring mechanism art hand exoskeleton mechanisms compliant mechanism body

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Automatic generation of modules of object categorization for autonomous mobile robots

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AIP Conference Proceedings 2013年第1期1558卷

作者： Anna Gorbenko Ural Federal University Department of Intelligent Systems and Robotics Mathematics and Computer Science Institute Lenin st. 51 620083 Ekaterinburg Russia

Many robotic tasks require advanced systems of visual sensing. Robotic systems of visual sensing must be able to solve a number of different complex problems of visual data analysis. Object categorization is one of such problems. In this paper, we propose an approach to automatic generation of computationally effective modules of object categorization for autonomous mobile robots. This approach is based on the consideration of the stack cover problem. In particular, it is assumed that the robot is able to perform an initial inspection of the environment. After such inspection, the robot needs to solve the stack cover problem by using a supercomputer. A solution of the stack cover problem allows the robot to obtain a template for computationally effective scheduling of object categorization. Also, we consider an efficient approach to solve the stack cover problem. In particular, we consider an explicit reduction from the decision version of the stack cover problem to the satisfiability problem. For different satisfiability algorithms, the results of computational experiments are presented.

关键词：

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Optical Position Stabilization of an UAV for Autonomous Landing

Optical Position Stabilization of an UAV for Autonomous Land...

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ROBOTIK 2012;7th German Conference on robotics

作者： Markus Ax Stefan Thamke Lars Kuhnert Jens Schlemper Klaus-Dieter Kuhnert University of Siegen Fak. IV - Electrical Engineering and Computer Science Institute for Real-Time Learning Systems

关键词： Optical sensors Robot sensing systems Optical variables measurement Optical imaging Global Positioning System Adaptive optics Mice

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The hamiltonian alternating path problem

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IAENG International Journal of Applied Mathematics 2012年第4期42卷 204-213页

作者： Gorbenko, Anna Popov, Vladimir Ural Federal University Department of Intelligent Systems and Robotics of Mathematics Computer Science Institute 620083 Ekaterinburg Russia

In this paper, we consider the Hamiltonian alternating path problem for graphs, multigraphs, and digraphs. We describe an approach to solve the problem. This approach is based on constructing logical models for the problem. We use logical models for the Hamiltonian alternating path problem to solve the Hamiltonian path problem and the planning a typical working day for indoor service robots problem. Also, we use these models for Bennett's model of cytogenetics, automatic generation of recognition modules, and algebraic data.

关键词： Hamiltonians

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The c-fragment longest arc-preserving common subsequence problem

IAENG International Journal of Computer Science

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IAENG International Journal of computer science 2012年第3期39卷 231-238页

作者： Gorbenko, Anna Popov, Vladimir Ural Federal University Department of Intelligent Systems Robotics of Mathematics and Computer Science Institute 620083 Ekaterinburg Russia

Arc-annotated sequences are useful in representing the structural information of RNA and protein sequences. In particular, arc-annotated sequences are useful in describing the secondary and tertiary structures of RNA and protein sequences. Structure comparison for RNA and for protein sequences has become a central computational problem bearing many challenging computer science questions. The longest arc-preserving common subsequence problem has been introduced as a framework for studying the similarity of arc-annotated sequences. It is a sound and meaningful mathematical formalization of comparing the secondary structures of molecular sequences. In this paper, we consider two special cases of the longest arc-preserving common subsequence problem, efragment LAPCS (unlimited, plain), c-fragment LAPCS (unlimited, unlimited). In particular, we consider a parameterized version of the 1-fragment LAPCS (unlimited, plain) problem, parameterized by the length l of the desired subsequence. We show W[1]-completeness of the problem. Also, we describe an approach to solve c-fragment LAPCS (unlimited, unlimited). This approach is based on constructing logical models for the problem.

关键词： RNA

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ADMM For Consensus On Colored Networks

ADMM For Consensus On Colored Networks

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IEEE Annual Conference on Decision and Control

作者： Joao F. C. Mota Joao M. F. Xavier Pedro M. Q. Aguiar Markus Puschel Department of Electrical and Computer Engineering Carnegie Mellon University Institute of Systems and Robotics Instituto Superior Tecnico Technical University of Lisbon Department of Computer Science

ISBN: (纸本)9781467320658

We propose a novel distributed algorithm for one of the most fundamental problems in networks: the average consensus. We view the average consensus as an optimization problem, which allows us to use recent techniques and results from the optimization area. Based on the assumption that a coloring scheme of the network is available, we derive a decentralized, asynchronous, and communication-efficient algorithm that is based on the Alternating Direction Method of Multipliers (ADMM). Our simulations with other state-of-the-art consensus algorithms show that the proposed algorithm is the one exhibiting the most stable performance across several network models.

关键词： distributed algorithms Network network model simulating

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