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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korea Robotics Society
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Journal DOI :
The Korea Robotics Society
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Volume & Issues
Volume 7, Issue 4 - Nov 2012
Volume 7, Issue 3 - Aug 2012
Volume 7, Issue 2 - May 2012
Volume 7, Issue 1 - Feb 2012
Selecting the target year
The control of a Mobile Inverted Pendulum with EtherCAT
Han, Jong-Ho ; Ryu, Tae-Yeol ; Lee, Jang-Myung ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 161~170
DOI : 10.7746/jkros.2012.7.3.161
The Industrial Ethernet technology enables advanced control architectures and offers several advantages for high precision multiple motors actuation. This paper presents the implementation and analysis of a motor drive with EtherCAT, an industrial standard for real time Ethernet. Considering the characteristics of the implemented software and the network interface, the motion and time-response of motor actuation for the networked Mobile Inverted Pendulum have been analyzed. Using the analysis with the task execution times measured from the developed drive, the performance characteristics of the drive in respect of the maximum achievable throughput have been verified by comparing to the conventional RS232.
Terrain Feature Extraction and Classification using Contact Sensor Data
Park, Byoung-Gon ; Kim, Ja-Young ; Lee, Ji-Hong ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 171~181
DOI : 10.7746/jkros.2012.7.3.171
Outdoor mobile robots are faced with various terrain types having different characteristics. To run safely and carry out the mission, mobile robot should recognize terrain types, physical and geometric characteristics and so on. It is essential to control appropriate motion for each terrain characteristics. One way to determine the terrain types is to use non-contact sensor data such as vision and laser sensor. Another way is to use contact sensor data such as slope of body, vibration and current of motor that are reaction data from the ground to the tire. In this paper, we presented experimental results on terrain classification using contact sensor data. We made a mobile robot for collecting contact sensor data and collected data from four terrains we chose for experimental terrains. Through analysis of the collecting data, we suggested a new method of terrain feature extraction considering physical characteristics and confirmed that the proposed method can classify the four terrains that we chose for experimental terrains. We can also be confirmed that terrain feature extraction method using Fast Fourier Transform (FFT) typically used in previous studies and the proposed method have similar classification performance through back propagation learning algorithm. However, both methods differ in the amount of data including terrain feature information. So we defined an index determined by the amount of terrain feature information and classification error rate. And the index can evaluate classification efficiency. We compared the results of each method through the index. The comparison showed that our method is more efficient than the existing method.
Affordance Perception And Behavior Planning Based on Analytic Hierarchy Process
Lee, Geun-Ho ; Kwon, Chul-Min ; Ikeda, Akihiro ; Chong, Nak-Young ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 182~193
DOI : 10.7746/jkros.2012.7.3.182
This paper presents a new behavior planning scheme for autonomous robots, allowing them to handle various objects used in our daily lives. The key idea underlying the proposed scheme is to use affordance concepts that provide a robot with action possibilities triggered by a relation between the robot and objects around it. Specifically, the robot attempts to find the affordances and to determine the most adequate action among them. Through a series of the perception processes, robot motions can be planned and performed to complete assigned tasks. What is of particular importance from the practical point of view is a decision making capability to determine the best choice by comparing the human's body characteristics and behavioral patterns as criteria with action possibilities as alternatives. For this, the analytic hierarchy process (AHP) technique is employed to systematically evaluate the correlation between the criteria and the alternatives. Moreover, the alternatives arranged in order of priority through the decision making process enable the robot to have redundant solutions for the assigned task, resulting in flexible motion generation. The effectiveness and validity of the proposed scheme are verified by performing extensive simulations using objects of our daily use.
Task Complexity of Movement Skills for Robots
Kwon, Woo-Young ; Suh, Il-Hong ; Lee, Jun-Goo ; You, Bum-Jae ; Oh, Sang-Rok ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 194~204
DOI : 10.7746/jkros.2012.7.3.194
Measuring task complexity of movement skill is an important factor to evaluate a difficulty of learning and/or imitating a task for autonomous robots. Although many complexity-measures are proposed in research areas such as neuroscience, physics, computer science, and biology, there have been little attention on the robotic tasks. To cope with measuring complexity of robotic task, we propose an information-theoretic measure for task complexity of movement skills. By modeling proprioceptive as well as exteroceptive sensor data as multivariate Gaussian distribution, movements of a task can be modeled as probabilistic model. Additionally, complexity of temporal variations is modeled by sampling in time and modeling as individual random variables. To evaluate our proposed complexity measure, several experiments are performed on the real robotic movement tasks.
Database based Global Positioning System Correction
Moon, Jun-Ho ; Choi, Hyuk-Doo ; Park, Nam-Hun ; Kim, Chong-Hui ; Park, Yong-Woon ; Kim, Eun-Tai ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 205~215
DOI : 10.7746/jkros.2012.7.3.205
A GPS sensor is widely used in many areas such as navigation, or air traffic control. Particularly, the car navigation system is equipped with GPS sensor for locational information. However, when a car goes through a tunnel, forest, or built-up area, GPS receiver cannot get the enough number of satellite signals. In these situations, a GPS receiver does not reliably work. A GPS error can be formulated by sum of bias error and sensor noise. The bias error is generated by the geometric arrangement of satellites and sensor noise error is generated by the corrupted signal noise of receiver. To enhance GPS sensor accuracy, these two kinds of errors have to be removed. In this research, we make the road database which includes Road Database File (RDF). RDF includes road information such as road connection, road condition, coordinates of roads, lanes, and stop lines. Among the information, we use the stop line coordinates as a feature point to correct the GPS bias error. If the relative distance and angle of a stop line from a car are detected and the detected stop line can be associated with one of the stop lines in the database, we can measure the bias error and correct the car's location. To remove the other GPS error, sensor noise, the Kalman filter algorithm is used. Additionally, using the RDF, we can get the information of the road where the car belongs. It can be used to help the GPS correction algorithm or to give useful information to users.
Development of a Remotely Operated Aerial Robot-kit based on the Balloon
Kim, Hyun-Sik ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 216~221
DOI : 10.7746/jkros.2012.7.3.216
Recently, although the need of marine robots being raised in extreme areas, the basis is very deficient. Fortunately, as the robot competition is vitalizing and the need of the robot education is increasing, it is desirable to establish the basis of the R&D and industrialization of marine robots and to train professionals through the development and diffusion of marine robot kits. However, in conventional case, there is no remotely operated aerial robot-kit based on the balloon for the marine robot competition, which has the abilities of the airborne locomotion and obstacle avoidance. To solve this problem, an aerial robot-kit which has the abilities of the airborne locomotion and remote control, is developed. To verify the performance of the developed kit, test and evaluation such as surge, yaw and pitch is performed. The test and evaluation results show that the possibility of the real applications of the developed kit.
Dynamic Parameters Identification of Robotic Manipulator using Momentum
Choi, Young-Jin ;
The Journal of Korea Robotics Society, volume 7, issue 3, 2012, Pages 222~230
DOI : 10.7746/jkros.2012.7.3.222
The paper presents a momentum-based regressor by using Hamiltonian dynamics representation for robotic manipulator. It has an advantage in that the proposed regressor does not require the acceleration measurement for the identification of dynamic parameters. Also, the identification algorithm is newly suggested by solving a minimization problem with constraint. The developed algorithm is easy to implement in real-time. Finally, the effectiveness of the proposed momentum-based regressor and identification method is shown through numerical simulations.