Y. Toda

Tokyo Metropolitan University, Edo, Tōkyō, Japan

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Publications (9)8.79 Total impact

  • Y. Toda, N. Kubota
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    ABSTRACT: This paper proposes a localization method using multiresolution maps for the navigation of multiple mobile robots based on formation behaviors. The remote control of multiple mobile robots is one the most important tasks in robotics to realize distributed remote monitoring in unknown and/or dynamic environments. However, it is very difficult for a human operator to control multiple mobile robots separately at the same time. Therefore, autonomous formation behaviors of multiple robots are required to reduce mental and physical loads of the human operator. If each mobile robot can estimate the self-position or relative position in a group, it is easier for multiple mobile robots to realize formation behaviors. First, we propose a method of simultaneous localization and mapping based on a grid approach. Next, we explain how to share the build map among multiple mobile robots, and propose a self-localization method based on multiresolution maps. Furthermore, we explain the formation behaviors of multiple mobile robots. Finally, we show several experimental results, and discuss the effectiveness of the proposed method.
    IEEE Transactions on Industrial Informatics 01/2013; 9(3):1772-1781. · 8.79 Impact Factor
  • Y. Toda, T. Narita, N. Kubota
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    ABSTRACT: This paper proposes a method for 3D modeling of environments used to perform teleoperation of a mobile robot. Recently, the expectation to tele-operated mobile robots has been increasing much in order to perform a monitoring in various scenes. However, there are many critical problems in tele-operated systems. Especially, we must expand visual range from a robot, the usability of human interface, and intention sharing between the robot and operator. First, we discuss information visualization for human-friendly tele-operation. Next, we propose a tele-operating system based on multi-resolution map. Finally, we propose a method of 3D modeling using Microsoft Kinect sensor, and show several experimental results of the proposed method.
    Evolutionary Computation (CEC), 2012 IEEE Congress on; 01/2012
  • Y. Yasuda, N. Kubota, Y. Toda
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    ABSTRACT: This paper proposes a method for constituting the formation of a multi-robot system according to dynamically changing environments. First, we apply a method of multi-objective behavior coordination for integrating behavior outputs from the fuzzy control for collision avoidance and target tracing. Second, we apply a spring model to calculate the temporary target position of each robot for the formation behavior. Third, we discuss multi-robot behaviors based on the concept of coupling. The tight coupling is realized by the spring model while the loose coupling is realized by the individual decision making based on connection and disconnection with other robots. Furthermore, the proposed method is applied to the exploration in unknown environments. Finally, we discuss the effectiveness of the proposed method through several simulation results.
    Fuzzy Systems (FUZZ-IEEE), 2012 IEEE International Conference on; 01/2012
  • Y. Toda, N. Kubota
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    ABSTRACT: This paper discusses the multi-modal communication for robot partners based on computational intelligence in informationally structured space. First, we explain recognition methods of touch interface, voice recognition, human detection, gesture recognition used in the multi-modal communication. Furthermore, we propose a conversation system to realize the multi-modal communication with a person. Finally, we show several experimental results of the proposed method, and discuss the future direction on this research.
    Consumer Electronics (GCCE), 2012 IEEE 1st Global Conference on; 01/2012
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    ABSTRACT: Recently, multi-robot systems have been discussed to realize a large size of distributed autonomous system. Furthermore, multi-robot systems have been applied to various problems such as autonomous guided vehicles, soccer robots, and search and rescue system by multi-robot. This paper proposes intelligent formation behavior for the multi-robot based on sensor fusion. First, we discuss multi-agent systems and wireless network technologies. Next, we explain the hardware specification of robot and tele-operated system and wireless communication. Finally, we show experimental results, and discuss the availability of intelligent formation behavior for multi-robot.
    Fuzzy Systems (FUZZ), 2011 IEEE International Conference on; 07/2011
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    ABSTRACT: This paper discusses measurement methods of human behaviors based on sensor network and human interaction of rehabilitation using robot partners. First, we explain robot partners and sensor networks for rehabilitation. Next, we apply a steady-state genetic algorithm to extract human motions from 3D distance image. Finally, we discuss the effectiveness of the proposed methods through several experimental results.
    Fuzzy Systems (FUZZ), 2011 IEEE International Conference on; 07/2011
  • Y. Toda, N. Kubota, N. Baba
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    ABSTRACT: Simultaneous localization and mapping (SLAM) is one of important topics in robotics. However, we must consider various intelligent behaviors in SLAM, e.g., the exploration of unknown areas and effective path planning of mobile robots. To realize these intelligent behaviors, we use a multi-resolution map. The multi-resolution map can be updated by the operators suitable to a specific aim. The first aim is to represent the occupied or empty cells in the built map. The next aim is to represent the unknown areas in the built map. These are used for the intelligent planning. The intelligent planning is composed of preplanning, online planning, and adaptive planning. These planning methods are used according to the state of a built map. The experimental results show the effectiveness of the proposed method.
    Robotic Intelligence In Informationally Structured Space (RiiSS), 2011 IEEE Workshop on; 05/2011
  • N. Kubota, Y. Toda, B.H. Lee
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    ABSTRACT: Recently, the expectation to tele-operated mobile robots has been increasing much in order to perform the monitoring in various scenes. However, there are many critical problems in tele-operated system. Especially, we must improve the restriction of visual range, the usability of human interface, and intention sharing with the operator. In this paper, we discuss the monitoring system of a tele-operated robot and human interface based on visual information and distance information from the tele-operated mobile robots. Next, we propose a method of a navigation system based on multi-featured visualization. Finally, we propose a tele-operated system using iPhone, and show several experimental results of the proposed method.
    Robotic Intelligence In Informationally Structured Space (RiiSS), 2011 IEEE Workshop on; 05/2011
  • Y. Toda, N. Kubota
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    ABSTRACT: Path planning is one of important topics in robotics. When the mobile robot is building the map, it is better to use the higher resolution map in order to build a precise map. However, after the map building, if the resolution of the built map is very high, it takes much computational memory and time to perform the path planning. To realize the effective path planning, we use a multi-resolution map. The multi-resolution map can be updated by the operators suitable to a specific aim. The first aim is to represent the occupied or empty cells in the built map. The next aim is to represent the unknown areas in the built map. These are used for the path planning. The path planning is based on potential field method. The path planning uses steady-state genetic algorithm in order to set up the sub-target points. The experimental results show the effectiveness of the proposed method.
    SICE Annual Conference (SICE), 2011 Proceedings of; 01/2011