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Conceptual imitation learning in a human-robot interaction paradigm

Conceptual imitation learning in a human-robot interaction p...

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作者： Hajimirsadeghi, Hossein Ahmadabadi, Majid Nili Araabi, Babak Nadjar Moradi, Hadi Cognitive Robotics Lab Control and Intelligent Processing Center of Excellence University of Tehran Iran

In general, imitation is imprecisely used to address different levels of social learning from high-level knowledge transfer to low-level regeneration of motor commands. However, true imitation is based on abstraction and conceptualization. This article presents a model for conceptual imitation through interaction with the teacher to abstract spatio-temporal demonstrations based on their functional meaning. Abstraction, concept acquisition, and self-organization of proto-symbols are performed through an incremental and gradual learning algorithm. In this algorithm, Hidden Markov Models (HMMs) are used to abstract perceptually similar demonstrations. However, abstract (relational) concepts emerge as a collection of HMMs irregularly scattered in the perceptual space but showing the same functionality. Performance of the proposed algorithm is evaluated in two experimental scenarios. The first one is a human-robot interaction task of imitating signs produced by hand movements. The second one is a simulated interactive task of imitating whole body motion patterns of a humanoid model. Experimental results show efficiency of our model for concept extraction, proto-symbol emergence, motion pattern recognition, prediction, and generation. © 2012 ACM.

关键词： Hidden Markov models

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Effect of flexible spine on stability of a passive quadruped robot: Experimental results

Effect of flexible spine on stability of a passive quadruped...

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2011 IEEE International Conference on robotics and Biomimetics, ROBIO 2011

作者： Kani, Mohammad Hasan H. Derafshian, Mostafa Bidgoly, Hamed Jalaly Ahmadabadi, Majid Nili Cognitive Robotics Lab. Control and Intelligent Processing Center of Excellence University of Tehran Iran

ISBN: (纸本)9781457721373

In rapid quadruped animals, the flexibility of spine is obviously observable while running. In this paper, we introduce a 3D passive dynamic quadruped robot, Fanari, that is capable to gallop down a slope without any external energy. We study the effect of spine flexibility on improvement of stability, adaptability and achievement of rapid leg locomotion. So a flexible spine that is capable to bend both outward and downward, a flexible spine that is only capable to bend outward and a rigid spine are designed and tested on the robot. Based on the case studies, we discuss about the challenges and the roles of spine stiffness on the gallop action. A simulation model is also made in order to corroborate the experimental results of the robot. It is concluded that the robot with the spine that is flexible in both outward and downward directions, has the most stability, adaptability and fastest velocity in its gallop action. © 2011 IEEE.

关键词： Multipurpose robots

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Context transfer and Q-Transferable tasks 29

Context transfer and Q-Transferable tasks

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29th AAAI Conference on Artificial Intelligence, AAAI 2015

作者： Mousavi, Amin Araabi, Babak Nadjar Ahmadabadi, Majid Nili Robotics and AI Lab Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Iran School of Cognitive Science Tehran Iran

ISBN: (纸本)9781577357209

This article discusses the notion of context transfer in reinforcement learning tasks. Context transfer, as defined in this article, implies knowledge transfer between tasks that share the same environment's dynamics and reward function, but have different state and action spaces. For example, we have a working mobile robot in an environment. At some point, we decide to upgrade its sensors and/or actuators. Any change in these modules will result in a different description of the agent- environment model, and the trained knowledge is no longer applicable. We consider the tasks of the old and new robots, as the source and target tasks, respectively. The Markov decision process (MDP) of these tasks, under certain conditions, are called Q-transferable tasks, and the problem of knowledge transfer between them is called context transfer. We investigate the relation of the MDPs of these tasks. Copyright © 2015, Association for the Advancement of Artificial Intelligence (***). All rights reserved.

关键词： Markov processes

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A new architecture to execute CAs-based path-planning algorithm in mobile robots

A new architecture to execute CAs-based path-planning algori...

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2006 IEEE International Conference on Mechatronics, ICM

作者： Akbarimajd, Adel Lucas, Caro Robotics and AI Lab. Department of Electrical and Computer Engineering University of Tehran Iran Center of Excellence for Control and Intelligent Processing Department of Electrical and Computer Engineering University of Tehran Iran

ISBN: (纸本)0780397134

Several path-planning algorithms for mobile robots have been introduced. Proper architectures for mobile robots to implement the path-planning algorithms are also of interest. If the mobile robots are to perform complicated tasks including complex sensing and planning operations and have accepted performance, must be autonomous: capable of acquiring information and performing tasks without programmatic intervention. In this paper we employ a layered architecture for mobile robots to perform our previously introduced cellular automata based path planning technique. It employs an abstraction approach which makes the complexity manageable. The architecture has an important feature which is its internal artifacts;it has some beliefs about the world and these beliefs are represented in artifacts and most actions are planned and performed with respect to these artifacts © 2006 IEEE.

关键词： Algorithms

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Who moved?! An investigation into distribution of actions and behaviors in a multi agent system

Who moved?! An investigation into distribution of actions an...

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2006 IEEE International Conference on Mechatronics, ICM

作者： Daneshvar, Roozbeh Lucas, Caro Artificial Intelligence and Robotics Lab. Faculty of Electrical and Computer Engineering University of Tehran Tehran Iran Center of Excellence for Control and Intelligent Processing Faculty of Electrical and Computer Engineering University of Tehran and School of Intelligent Systems Tehran Iran

ISBN: (纸本)0780397134

In this paper we have considered systems in which agents communicate via their environment. In these systems the agents do not have direct and explicit communication with each other and instead they have implicit communication which is performed via the environment they are located in. Different kinds of environment elements are considered to be changed while on the other hand for all of these situations there is a change in the environment and this change means potential stimuli that fires behaviors of agents for future. It is considered that if we can find a track of changes in the environment and find the roots of a movement in an agent that is originally made by another agent of the group. © 2006 IEEE.

关键词： Multi agent systems

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Mechanical Design, Fabrication, Kinematics and Dynamics Modeling, Multiple Impedance control of a Wrist Rehabilitation Robot

Mechanical Design, Fabrication, Kinematics and Dynamics Mode...

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RSI/ISM International Conference on robotics and Mechatronics

作者： Mohammad Reza Sajadi Ali Nasr S. Ali A. Moosavian Hassan Zohoor Center of Excellence in Mechatronics University of Tabriz Tabriz Iran t Center of Excellence in Robotics and Control ARAS Lab. K.N. Toosi University of Technology Tehran Iran Center of Excellence in Robotics and Control ARAS Lab. K.N. Toosi University of Technology Tehran Iran Center of Excellence in Design Robotics and Automation Sharif Univ. of Tech. Tehran Iran

ISBN: (纸本)9781467372350

Rehabilitation is the best approach for patients who suffer physical disability of their upper-limbs. Maintaining the intensity of exercise during treatment is the main factor that makes the robots suitable for rehabilitation since robots do not get tired and do the exercises with constant intensity under supervision of the doctor. Two main categories of rehabilitation robots are End-Effector based robots and wearable robots. According to the fact that most problems occur in need of rehabilitation for hand wrist area, in this paper a wearable rehabilitation robot has been developed for the wrist. Nowadays, wearable robots attract more attention than the other group. Wearable robots are categorized into three types: Exoskeleton robots, Prosthetic robots and Orthotic robot. In this paper, a new structure for an Orthotic wearable robot is developed for human wrist rehabilitation. This structure has an automatic base that makes the robot suitable for both hands. This robot has three degrees of freedom that is similar to human wrist joint. In the remaining of the paper, Conceptual design, mechanical design, kinematics and dynamic analysis of the robot as well as multiple impedance control are presented.

关键词： Wrist Rehabilitation Robot Design and Fabrication Robot Kinematics and Dynamics Modeling Multiple Impedance control

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Manipulation by Juggling of Planar Polygonal Objects Using Two 3-DOF Manipulators

Manipulation by Juggling of Planar Polygonal Objects Using T...

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2007 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Pages 805-1210

作者： Adel Akbarimajd Majid Nili Ahmadabadi Control and Intelligent Processing Center of Excellence Robotics and AI Lab. ECE Department University of Tehran Iran

ISBN: (纸本)1424412633

Dynamic object manipulation of planar polygonal objects using two 3-DOF planar manipulators is studied. The object rests on the palm of a manipulator and the manipulator throws the object into kinematical workspace of the other one. The second manipulator catches the object and carries it into the goal configuration. Manipulation task is modeled and dynamic grasp condition is obtained for the instances that the manipulators carry the object on their palms. In addition, a manipulation planning strategy is devised. The planning strategy uses time of free flight as a free parameter to determine the throw and catch states. Proposed manipulation method is verified by a set of simulations in ADAMS+SIMULINK.

关键词： Nonprehensile Manipulation Dynamic object manipulation Multirobot object manipulation Juggling

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Balance Recovery of a Quadruped Robot

Balance Recovery of a Quadruped Robot

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RSI/ISM International Conference on robotics and Mechatronics

作者： Mahdi Khorram S. Ali A. Moosavian Center of Excellence in Robotics and Control Advanced Robotics and Automated Systems Lab Dept of Mech Eng K. N. Toosi Univ of Tech Tehran Iran Center of Excellence in Robotics and Control Advanced Robotics and Automated Systems Lab Dept of Mech Eng K. N. Toosi Univ of Tech Tehran Iran

ISBN: (纸本)9781467372350

Maintaining the balance or stability of legged robots in natural terrains is a challenging problem. Besides the inherent unstable characteristics of legged robots, the sources of instability are the irregularities of the ground surface and also the external pushes. In this paper, a push recovery framework for restoring the robot balance against external unknown disturbances will be demonstrated. It is assumed that the magnitude of exerted pushes is not large enough to use a reactive stepping strategy. In the comparison with previous methods, which a simplified model such as point mass model is used as the model of the robot for studying the push recovery problem, the whole body dynamic model will be utilized in present work. This enhances the capability of the robot to exploit all of the DOFs to recover its balance. To do so, an explicit dynamic model of a quadruped robot will be derived. The balance controller is based on the computation of the appropriate acceleration of the main body. It is calculated to return the robot to its desired position after the perturbation. This acceleration should be chosen under the stability and friction conditions. To calculate main body acceleration, an optimization problem is defined so that the stability, friction condition considered as its constraints. The simulation results show the effectiveness of the proposed algorithm. The robot can restore its balance against the large disturbance solely through the adjustment of the position and orientation of main body.

关键词： Push recovery Quadruped robots dynamics stability friction constraints

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Kinematics and Dynamics Modeling of Spherical Parallel Manipulator

Kinematics and Dynamics Modeling of Spherical Parallel Manip...

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

作者： Omid Mahdizadeh Afshin Zeinaddini Meymand Mojtaba Mollahossein S. Ali A. Moosavian Center of Excellence in Robotics and Control Advanced Robotics and Automated Systems (ARAS) Lab K. N. Toosi University of Technology Tehran Iran

ISBN: (纸本)9781728101286;9781728101279

Spherical parallel manipulators have been proposed for accurate and fast performance. In this paper, kinematics and dynamics of a spherical three degrees-of-freedom parallel manipulator are studied. First, both direct and inverse kinematics are solved by using a new geometric approach and defining a new appropriate set of coordinates. Then, based on the derived kinematics equations and Jacobian matrices of links, according to Lagrange method, the explicit dynamics formulation of the manipulator is developed. The obtained dynamics has been verified by using *** and MATlab Software, simultaneously. This explicit verified model is highly important to design and implement various model based control algorithms. So, a Fuzzy Adaptive PID controller is designed to show the controller's operation on the manipulator. Discussing the obtained results reveal the merits and importance of the proposed modeling.

关键词： Manipulator dynamics Kinematics Mathematical model Jacobian matrices Gravity Dynamics

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Dynamics Modelling and Parameters Estimation for Nonlinear-Model Predictive control of Underwater Robots

Dynamics Modelling and Parameters Estimation for Nonlinear-M...

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RSI/ISM International Conference on robotics and Mechatronics (ICROM)

作者： S. Ali A. Moosavian Mohammad Jamali Omid Mahdizadeh Vahid Akbari Center of Excellence in Robotics and Control Advanced Robotics and Automated Systems (ARAS) Lab K. N. Toosi University of Technology Tehran Iran

ISBN: (纸本)9781665420952

Underwater robots are to be extensively used in various submerged missions. A few research works have been conducted to investigate the nonlinear dynamical behavior of such systems in ocean flows. In this paper, dynamics modeling and parameters estimation for these complicated systems are developed for using model-based predictive control. It is begun by presenting the nonlinear equations governing the dynamics of an underwater robot in an ocean open flow. Additionally, the movement of the diving and depth motion of the robot in such cases is analyzed. A method to estimate hydrodynamic and other parameters of an underwater robot is presented and compared with experimental data. This method consists of close-to-reality simulation using a CFD subsystem of the ANSYS software. Finally, these parameters are used to design a model-based controller. Numerical simulations are carried out to evaluate the performance of the controllers. Among all the model-based controllers, nonlinear Model Predictive control (nonlinear-MPC) with constraints will be able to follow the setpoints within less time and less control effort. The experimental data confirm the simulation results, proving the underwater robot's capability for path-following in an ocean open flow.

关键词： Autonomous underwater vehicles Parameter estimation Oceans Simulation Predictive models Mathematical models Software

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