Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 33
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
3D Cameras: 3D Computer Vision of Wide Scope InTech
Stefan May; Kai Pervoelz; Hartmut Surmann.
First of all, a short comparison of range sensors and their underlying principles was given. The chapter further focused on 3D cameras. The latest innovations have given a significant improvement for the measurement accuracy, wherefore this technology has attracted attention in the robotics community. This was also the motivation for the examination in this chapter. On this account, several applications were presented, which represents common problems in the domain of autonomous robotics. For the mapping example of static scenes, some difficulties have been shown. The low range, low apex angle and low dynamic range compared with 3D laser scanners, raised a lot of problems. Therefore, laser scanning is still the preferred technology for this use case. Based...
Tipo: 11 Palavras-chave: Vision Systems: Applications.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/3d_cameras__3d_computer_vision_of_wide_scope
Imagem não selecionada

Imprime registro no formato completo
A Facial Expression Imitation System for the Primitive of Intuitive Human-Robot Interaction InTech
Do Hyoung Kim; Kwang Ho An; Yeon Geol Ryu; Myung Jin Chung.
This Chapter has attempted to deal with the issues on establishing a facial expression imitation system for natural and intuitive interactions with humans. Several real-time cognition abilities are implemented to a robotic system such as face detection, face tracking, and facial expression recognition. Moreover, a robotic system with facial components is developed, which is able to imitate human's facial expressions. A method of recognizing facial expressions is proposed through the use of an innovative rectangle feature. Using the AdaBoost algorithm, an expanded version of Viola and Jones' method has been suggested as a new approach. We deal with 7 facial expressions: neutral, happiness, anger, sadness, surprise, disgust, and fear. For each facial...
Tipo: 11 Palavras-chave: Human Robot Interaction.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/a_facial_expression_imitation_system_for_the_primitive_of_intuitive_human-robot_interaction
Imagem não selecionada

Imprime registro no formato completo
A New Algorithm for Initialization and Training of Beta Multi-Library Wavelets Neural Network InTech
Wajdi Bellil; Mohamed Othmani; Chokri Ben Amar; Mohamed Adel Alimi.
In this chapter, we described a new training algorithm for multi library wavelets network. We needed a selection procedure, a cost function and an algorithm of minimization for the evaluation. To succeed a good training, we showed that it was necessary to unite good ingredients. Indeed, a good algorithm of minimization finds a minimum quickly; but this one is not necessarily satisfactory. The use of a selection algorithm is fundamental. Indeed, the good choice of regressors guarantees a more regular shape of the cost function; the global minima correspond well to the "true" values of the parameters, and avoid the local minimum multiplication. So the cost function present less local minima and the algorithms of evaluation find the global minimum more...
Tipo: 11 Palavras-chave: Advances in Robotics; Automation and Control.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/a_new_algorithm_for_initialization_and_training_of_beta_multi-library_wavelets_neural_network
Imagem não selecionada

Imprime registro no formato completo
A Pseudo Stereo Vision Method using Asynchronous Multiple Cameras InTech
Shoichi Shimizu; Hironobu Fujiyoshi; Yasunori Nagasaka; Tomoichi Takahashi.
We proposed a method of pseudo-stereo vision method using cameras with different shutter timings, where the previous two frames were calculated using a spline curve. The method can output a 3D position at 90 fps using three cameras, and using multiple cameras is expected to enhance the output of the 3D positions. We confirmed that our method was better than stereo vision with the time delay in simulation experiments. The error was 9.2 mm in experiments using real cameras. However, the error was within a useful range, because the object’s radius was 20 mm. Moreover, it is clear that our method is better than the stereo vision with asynchronous shutter timing.
Tipo: 11 Palavras-chave: Scene Reconstruction Pose Estimation and Tracking.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/a_pseudo_stereo_vision_method_using_asynchronous_multiple_cameras
Imagem não selecionada

Imprime registro no formato completo
An Active Stereo Vision-Based Learning Approach for Robotic Tracking, Fixating and Grasping Control InTech
Nan-Feng Xiao; Saeid Nahavandi.
The following conclusions are drawn from the above experiments: (1) There exist many-to-one mapping relationships between the joint angles of the active stereo vision system and the spatial representations of the object in the workspace frame. (2) ART_NN and FF_NN can learn the mapping relationships in an invariant manner to the changing joint angles. The vision and joint angle signals of the active vision system corresponding to the object correspond to the same spatial representation of the object. 181
Tipo: 11 Palavras-chave: Cutting Edge Robotics.
Ano: 2005 URL: http://www.intechopen.com/articles/show/title/an_active_stereo_vision-based_learning_approach_for_robotic_tracking__fixating_and_grasping_control
Imagem não selecionada

Imprime registro no formato completo
An Adaptive Biped Gait Generation Scheme Utilizing Characteristics of Various Gaits InTech
Kengo Toda; Ken Tomiyama.
A Sensor-Based Gait Generation method was introduced and an experimental system was built. Then, the system was implemented onto an original humanoid robot to evaluate operations and to demonstrate effectiveness of the proposed method. Experimental results exhibited successful gait selection corresponding to the road surface condition obtained from sensor information. Additionally, walking velocity and the energy efficiency are both enhanced without reducing the success rate of walking. The design approach for Gait Selector based on both ZMP and the angular momentum adopted in this study is a sufficiently general and valid one. The developed Gait Selector should be applicable to many gaits and humanoids. However, more conditional branchings based not only...
Tipo: 11 Palavras-chave: Humanoid Robots; Human-like Machines.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/an_adaptive_biped_gait_generation_scheme_utilizing_characteristics_of_various_gaits
Imagem não selecionada

Imprime registro no formato completo
Armless Climbing and Walking in Robotics InTech
Maki K. Rashid.
The present work has proven the effectiveness of using the virtual prototyping and real time simulation in investigating the dynamic of a single wheel mobile robot under different manoeuvring tasks. Intelligent controller implementation has been shown to be effective in overcoming the difficulties raised from the unpredictable parameters such as friction, and other dynamic forces. The constructed neurofuzzy controller with ANFIS has indicated improvement over the Takagi-Sugeno fuzzy controller. The control tactics was tested with a robot passing a platform of three segments. The robot has shown capability in climbing an uphill ground or passing obstacle with different tilt angles where both friction and restitution coefficients between the wheel and the...
Tipo: 11 Palavras-chave: Bioinspiration and Robotics Walking and Climbing Robots.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/armless_climbing_and_walking_in_robotics
Imagem não selecionada

Imprime registro no formato completo
Ball-Shaped Robots InTech
Tomi Ylikorpi; Jussi Suomela.
Throughout history, ball-shaped toys have been quite popular and they still exist. Developments in computer technology, wireless data transfer, and digital cameras have given them many advanced operational capabilities. Autonomous ball-shaped robots are being introduced back into modern homes, this time not only as toys, but also as serving and guarding robots. Future work in this field will concentrate on analysing and developing the dynamics and control of the ball, as well as on applications and interaction with the environment and people. The utilisation of large wind-propelled balls for Mars exploration has been widely studied in many separate institutions. The main advantages are large size, low mass, and autonomous mobility, accompanied by the...
Tipo: 11 Palavras-chave: Climbing and Walking Robots: towards New Applications.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/ball-shaped_robots
Imagem não selecionada

Imprime registro no formato completo
Calibration of 3-DOF Translational Parallel Manipulators Using Leg Observations InTech
Anatol Pashkevich; Damien Chablat; Philippe Wenger; Roman Gomolitsky.
Recent advances in parallel robot architectures encourage related research on kinematic calibration of parallel mechanisms. This paper proposes a novel calibration approach based on observations of manipulator leg parallelism with respect to the Cartesian planes. Presented for the Orthoglide-type mechanisms, this approach may be also applied to other manipulator architectures that admit parallel leg motions (along the Cartesian axes) or, in more general case, allow locating the leg in several postures with a common intersection point. The proposed calibration technique employs a simple and low-cost measuring system composed of standard comparator indicators attached to the universal magnetic stands. They are sequentially used for measuring the deviation of...
Tipo: 11 Palavras-chave: Parallel Manipulators; New Developments.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/calibration_of_3-dof_translational_parallel_manipulators_using_leg_observations
Imagem não selecionada

Imprime registro no formato completo
Comparative Analysis of Mobile Robot Localization Methods Based on Proprioceptive and Exteroceptive Sensors InTech
Gianluca Ippoliti; Leopoldo Jetto; Sauro Longhi; Andrea Monteriu.
1
Tipo: 11 Palavras-chave: Mobile Robots: Perception & Navigation.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/comparative_analysis_of_mobile_robot_localization_methods_based_on_proprioceptive_and_exteroceptive_
Imagem não selecionada

Imprime registro no formato completo
Developments on an Affordable Robotic System for Humanitarian Demining InTech
Pedro Santana; Luis Correia; Jose Barata.
This chapter presented some guidelines to build a portable demining kit, which is intended to be a fast deployable and affordable robotic system to aid in emergency situations. Since the logistics of a portable demining kit are less demanding when compared to a regular demining campaign, local mine action centres, provided with such a tool, will be able to be more responsive to emergency situations, reducing the chances of further victims. It has been shown that to be successful, these kits must also be self-sustainable. This ranges from requiring simple maintenance, to the fact that they should be usable in other domains. If that is the case, then the owners, local governments for example, can exploit the devices for other purposes. Several aspects of a...
Tipo: 11 Palavras-chave: Humanitarian Demining.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/developments_on_an_affordable_robotic_system_for_humanitarian_demining
Imagem não selecionada

Imprime registro no formato completo
Dynamics of the Bush-Mosteller Learning Algorithm in 2x2 Games InTech
Luis R. Izquierdo; Segismundo S. Izquierdo.
This chapter has characterised the behaviour of the Bush-Mosteller (Bush & Mosteller, 1955) aspiration-based reinforcement learning model in 2x2 games. The dynamics of this process depend mainly on three features: The speed of learning. The existence of self-reinforcing equilibria (SREs). SREs are states which are particularly relevant for the ultralong-run or asymptotic behaviour of the process. The existence of self-correcting equilibria (SCEs). SCEs are states which are particularly relevant for the transient behaviour of the process with low learning rates. With high learning rates, the model approaches its asymptotic behaviour fairly quickly. If there are SREs, such asymptotic dynamics are concentrated on the SREs of the system. With low learning...
Tipo: 11 Palavras-chave: Reinforcement Learning.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/dynamics_of_the_bush-mosteller_learning_algorithm_in_2x2_games
Imagem não selecionada

Imprime registro no formato completo
Embedded Behavioral Control of Four-legged Robots InTech
David Herrero Perez; Humberto Martinez Barbera.
This work has presented the architecture and behavioral programming model used to develop a team of the Sony Four-Legged League, which is one of the official leagues of the RoboCup. This league is a very demanding scenario, with high uncertainty in perceptions and limited processing power. In addition, having a competition implies that some dates the software development and tuning presents high activity peaks. These facts condition the way robots have to be programmed. Thus, our main goal has been improving productivity as much as possible while being able to correctly develop all the required behaviors. The approach consists on adopting a programming architecture that reflects a cognitive separation of modules and allows for an efficient management of...
Tipo: 11 Palavras-chave: Robotic Soccer.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/embedded_behavioral_control_of_four-legged_robots
Imagem não selecionada

Imprime registro no formato completo
Exploratory Investigation into Influence of Negative Attitudes toward Robots on Human-Robot Interaction InTech
Tatsuya Nomura; Takayuki Kanda; Tomohiro Suzuki; Kensuke Kato.
This chapter provided the concept of negative attitudes toward robots and a measurement method for them, "Negative Attitudes toward Robots Scale (NARS)", as a psychological index in research on human-robot interaction. Then, it showed the results of some experiments and social research by using this psychological scale. The results implicated by the NARS show the efficiency of this scale in both human-robot interaction experiments and social research. They revealed that attitudes toward robots are related to behaviours toward them, these attitudes are different depending on situations and assumptions about robots, and there may be gender differences associated with them. These implications may contribute to design issues of communication robots and...
Tipo: 11 Palavras-chave: Mobile Robots: towards New Applications.
Ano: 2006 URL: http://www.intechopen.com/articles/show/title/exploratory_investigation_into_influence_of_negative_attitudes_toward_robots_on_human-robot_interact
Imagem não selecionada

Imprime registro no formato completo
From Time Petri Nets to Timed Automata InTech
Franck Cassez; Olivier H. Roux.
In this chapter, we have presented time Petri Nets (TPNs) and a structural translation from TPNs to TA. Any TPN T and its associated TA (T ) are timed bisimilar. Such a translation has many theoretical implications. Most of the positive theoretical results on TA carry over to TPNs. The class of TPNs can be extended by allowing strict constraints (open, half-open or closed intervals) to specify the firing dates of the transitions; for this extended class, the following results follow from our translation and from Theorem 5: ? TCTL model checking is decidable for bounded TPNs. Moreover efficient algorithms used in U PPAAL (Pettersson and Larsen, 2000) and K RONOS (Yovine, 1997) are exact for the class of TA obtained with our translation; ? it is decidable...
Tipo: 11 Palavras-chave: Petri Net; Theory and Applications.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/from_time_petri_nets_to_timed_automata
Imagem não selecionada

Imprime registro no formato completo
Fuzzy Multiple Agent Decision Support Systems for Supply Chain Management InTech
Mohammad Hossein Fazel Zarandi; Mohammad Mehdi Fazel Zarandi.
This chapter proposes a proper modular architecture for the information agent, based on the inputs, functions, and outputs of the agent, for supply chain management. The proposed architecture has nine different modules, each of which is responsible for one or more function(s) for the information agent. Then, we explored the occurrence of bullwhip effect in supply chains, in a fuzzy environment. We built an agent-based system which can operate in a fuzzy environment and is capable of managing the supply chain in a completely uncertain environment. They are able to track demands, remove the bullwhip effect almost completely, and discover policies under complex scenarios, where analytical solutions are not available. Such an automated supply chain is...
Tipo: 11 Palavras-chave: Supply Chain.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/fuzzy_multiple_agent_decision_support_systems_for_supply_chain_management
Imagem não selecionada

Imprime registro no formato completo
Improving the Grapevine Technology by Optimising the Utilisation of the Environmenthal Resources in the Murfatlar Vineyard InTech
Aurora Ranca.
The yearly climatic condition represented mainly by thermal, lightening and hydro parameters specific for the vineyard biotope are directly related with growing and developing rate of plants, changing the active period of the these influencing the achievement of a constant and qualitative harvest (Jones, 2005, Stock, 2005).
Tipo: 11 Palavras-chave: Environmental Technologies.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/improving_the_grapevine_technology_by_optimising_the_utilisation_of_the_environmenthal_resources_in_
Imagem não selecionada

Imprime registro no formato completo
Intelligent Global Face Recognition InTech
Adnan Khashman.
The recognition of a face that has been seen before is a natural and easy task that we humans perform everyday. What information we pick from a face during a glance may be mysterious but the result is usually correct recognition. Do we only look at features such as eyes or nose (local feature detection) or do we ignore these features and look at a face as a whole (global face recognition)? Many research works on face recognition attempt to answer these questions, however, one common concept that is shared by most methods is that the detection of a face requires facial information, which can be obtained locally (using local facial features such as eyes) or globally (using a whole face).
Tipo: 11 Palavras-chave: Face Recognition.
Ano: 2007 URL: http://www.intechopen.com/articles/show/title/intelligent_global_face_recognition
Imagem não selecionada

Imprime registro no formato completo
Internet-Based Service Robotic System Using CORBA as Communication Architecture InTech
Songmin Jia; Kunikatsu Takase.
We used CORBA as communication architecture to implement networking connections between a client and the developed hand-eye robotic system. CORBA uses an Object Request Broker (ORB) as the middleware that establishes client/server relationships between objects. The client can invoke a method on a server object across a network transparently without knowing where the application servers are located, or what programming language and operating system are used. This lets system overcome the shortcomings of the other Internet robotic systems. In addition, the components of the CORBA-based system can be implemented and run independently to implement the application, and also be integrated easily into new systems. This facilitates networkdistributed software...
Tipo: 11 Palavras-chave: Industrial Robotics: Programming; Simulation and Applications.
Ano: 2006 URL: http://www.intechopen.com/articles/show/title/internet-based_service_robotic_system_using_corba_as_communication_architecture
Imagem não selecionada

Imprime registro no formato completo
Learning to Walk with Model Assisted Evolution Strategies InTech
Matthias Hebbel; Walter Nistico.
Evolution Strategies are well suited to optimize the parameters of this practical problem. However the MAES outperform the standard ES by far and lead to a much faster convergence. The controlled MAES variants in this case can improve the convergence speed
Tipo: 11 Palavras-chave: Frontiers in Evolutionary Robotics.
Ano: 2008 URL: http://www.intechopen.com/articles/show/title/learning_to_walk_with_model_assisted_evolution_strategies
Registros recuperados: 33
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional