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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Institute of Control, Robotics and Systems
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Journal DOI :
Institute of Control, Robotics and Systems
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Volume & Issues
Volume 19, Issue 12 - Dec 2013
Volume 19, Issue 11 - Nov 2013
Volume 19, Issue 10 - Oct 2013
Volume 19, Issue 9 - Sep 2013
Volume 19, Issue 8 - Aug 2013
Volume 19, Issue 7 - Jul 2013
Volume 19, Issue 6 - Jun 2013
Volume 19, Issue 5 - May 2013
Volume 19, Issue 4 - Apr 2013
Volume 19, Issue 3 - Mar 2013
Volume 19, Issue 2 - Feb 2013
Volume 19, Issue 1 - Jan 2013
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Output-feedback LPV Control for Uncertain Systems with Input Saturation
Kim, Sung Hyun ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 489~494
DOI : 10.5302/J.ICROS.2013.13.1898
This paper tackles the problem of designing a dynamic output-feedback control for linear discrete-time norm-bounded uncertain systems with input saturation. By employing a LPV (Linear Parameter Varying) instead of LTI (Linear Time-Invariant) control, the useful information on interpolation parameters appearing in the procedure of representing saturation nonlinearity as a convex polytope is additionally applied in the control design procedure. By solving the addressed problem that can be recast into a convex optimization problem characterized by LMIs (Linear Matrix Inequalities) with one prescribed scalar, the vertices of convex set containing an LPV output-feedback control gain and the associated maximal invariant set of initial states are simultaneously obtained.
Double Sliding Surfaces based on a Sliding Mode Control for a Tracking Control of Mobile Robots
Lee, Jun Ku ; Choi, Yoon Ho ; Park, Jin Bae ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 495~500
DOI : 10.5302/J.ICROS.2013.13.1872
This paper proposes a double sliding surfaces based on a sliding mode control for a tracking control of nonholonomic mobile robots in the Cartesian coordinates. In order to remove sliding surface constraints, we design the additional sliding surface for the heading angle with respect to the newly defined coordinates. Then, we define the switching law based on the posture error to combine the designed sliding surface with the previous one. By using the double sliding surfaces and the switching law, we obtain the control law for arbitrary trajectories. It is proved that the position tracking error and the heading direction error asymptotically converge to zero, respectively, with the Lyapunov stability theory. Finally, through computer simulations, we demonstrate the effectiveness of the proposed control system.
Implementation and Balancing Control of One-Wheel Robot, GYROBO
Kim, Pil-Kyo ; Park, Junehyung ; Ha, Min Soo ; Jung, Seul ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 501~507
DOI : 10.5302/J.ICROS.2013.13.1880
This paper presents the development and balancing control of GYROBO, a one wheeled mobile robot system. GYROBO is a disc type one wheel mobile robot that has three actuators, a drive motor, a spin motor, and a tilt motor. The dynamics and kinematics of GYROBO are analyzed, and simulation studies conducted. A one-wheeled robot, GYROBO is built and its balancing control is performed. Experimental studies of GYROBO`s balancing abilities are conducted to demonstrate the gyroscopic effects generated by the spin and tilt angles of a flywheel.
Sensorless Drive of the BLDC Motor using a Line Voltage Difference
Kim, Tae-Yeon ; Lyou, Joon ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 508~512
DOI : 10.5302/J.ICROS.2013.13.1894
In recent years, sensorless drive schemes have been proposed widely and most of them are based on the ZCP (Zero Crossing Point) detection of the BEMF (Back Electro-Motive Force). These schemes have two main problems. One is that ZCP may not be detected at low speed and thus a forced drive is required. The other problem is that there is
phase difference between ZCP and the motor commutation instant and to ensure proper operation, this gap should be accounted for. To solve these problems a circuit is devised for detecting ZCP of the BEMF difference through the line voltage difference. Experimental results show that the output of this circuit is identical to that of the Hall sensor signal, and velocity control of a BLDC motor is possible without the sensor.
A Study on Emotion Recognition Systems based on the Probabilistic Relational Model Between Facial Expressions and Physiological Responses
Ko, Kwang-Eun ; Sim, Kwee-Bo ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 513~519
DOI : 10.5302/J.ICROS.2013.13.1900
The current vision-based approaches for emotion recognition, such as facial expression analysis, have many technical limitations in real circumstances, and are not suitable for applications that use them solely in practical environments. In this paper, we propose an approach for emotion recognition by combining extrinsic representations and intrinsic activities among the natural responses of humans which are given specific imuli for inducing emotional states. The intrinsic activities can be used to compensate the uncertainty of extrinsic representations of emotional states. This combination is done by using PRMs (Probabilistic Relational Models) which are extent version of bayesian networks and are learned by greedy-search algorithms and expectation-maximization algorithms. Previous research of facial expression-related extrinsic emotion features and physiological signal-based intrinsic emotion features are combined into the attributes of the PRMs in the emotion recognition domain. The maximum likelihood estimation with the given dependency structure and estimated parameter set is used to classify the label of the target emotional states.
Study on Communication Interface of Multiple Smartphones for Unit Control in a PC
Jung, Hahmin ; Kim, Dong Hun ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 520~526
DOI : 10.5302/J.ICROS.2013.13.1871
This study presents the unit control of a PC (Personal Computer) program using multiple smartphones based on ad hoc communication. A design of the data packet that multiple smartphones send to a computer, and a framework that manages and controls the unit in a computer after analyzing the data packet, are proposed. As a result, multiple users are able to control their own units using their smartphones while seeing the monitor connected to a computer. In other words, multiple users can share the same game in a computer or control their units embedded in a system using their smartphones. An experimental result shows that a racing game in a PC can be realized by the proposed communication interface, where four iPhones are used to control their units in a computer. Thus, the proposed framework can be effectively used for unit control in a PC using multiple smartphones.
Optimal EEG Channel Selection by Genetic Algorithm and Binary PSO based on a Support Vector Machine
Kim, Jun Yeup ; Park, Seung-Min ; Ko, Kwang-Eun ; Sim, Kwee-Bo ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 527~533
DOI : 10.5302/J.ICROS.2013.13.1864
BCI (Brain-Computer Interface) is a system that transforms a subject`s brain signal related to their intention into a control signal by classifying EEG (electroencephalograph) signals obtained during the imagination of movement of a subject`s limbs. The BCI system allows us to control machines such as robot arms or wheelchairs only by imaging limbs. With the exact same experiment environment, activated brain regions of each subjects are totally different. In that case, a simple approach is to use as many channels as possible when measuring brain signals. However the problem is that using many channels also causes other problems. When applying a CSP (Common Spatial Pattern), which is an EEG extraction method, many channels cause an overfitting problem, and in addition there is difficulty using this technique for medical analysis. To overcome these problems, we suggest an optimal channel selection method using a BPSO (Binary Particle Swarm Optimization), BPSO with channel impact factor, and GA. This paper examined optimal selected channels among all channels using three optimization methods and compared the classification accuracy and the number of selected channels between BPSO, BPSO with channel impact factor, and GA by SVM (Support Vector Machine). The result showed that BPSO with channel impact factor selected 2 fewer channels and even improved accuracy by 10.17~11.34% compared with BPSO and GA.
Construction of a Database for Road Images and Geometric Transformation
Lee, Joon-Woong ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 534~539
DOI : 10.5302/J.ICROS.2013.13.1901
Recently, the number of vehicles equipped with cameras that are generally used to recognize surroundings is increasing. For robust recognition, a huge amount of tests under various environments are performed. Furthermore, the installation position or orientation of the camera is also changed depending on the vehicle. This change also accompanies many tests. Correspondingly, a large cost and a great deal of manpower are required to perform these tests. This paper proposes a method to cut these costs while conducting enough tests through the construction of a database of videos and a geometric transformation of images.
Joint Space Trajectory Planning Considering Physical Limits for Two-wheeled Mobile Robots
Yang, Gil-Jin ; Choi, Byoung-Wook ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 540~546
DOI : 10.5302/J.ICROS.2013.13.1860
This paper presents a trajectory planning algorithm for TMR (Two-wheeled Mobile Robots). The trajectory is developed in joint space and considers the physical limits of a TMR. First, we present a process for generating a smooth curve through a Bezier curve. The trajectory for the center of the TMR following the Bezier curve is developed through a convolution operator taking into consideration its physical limits. The trajectory along the Bezier curve is regenerated using time-dependent parameters which correspond to the distance driven by the velocity of the center of the TMR in a sampling time. The velocity commands in the Cartesian space are converted to actuator commands for two wheels. In case that the actuator commands exceed the maximum velocity, the trajectory is redeveloped with compensated center velocity. We also suggest a smooth trajectory planning algorithm in joint space for the two segmented paths. Finally, the effectiveness of the algorithm is shown through numerical examples and application to a simulator.
Multi-robot Formation based on Object Tracking Method using Fisheye Images
Choi, Yun Won ; Kim, Jong Uk ; Choi, Jeong Won ; Lee, Suk Gyu ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 547~554
DOI : 10.5302/J.ICROS.2013.12.1847
This paper proposes a novel formation algorithm of identical robots based on object tracking method using omni-directional images obtained through fisheye lenses which are mounted on the robots. Conventional formation methods of multi-robots often use stereo vision system or vision system with reflector instead of general purpose camera which has small angle of view to enlarge view angle of camera. In addition, to make up the lack of image information on the environment, robots share the information on their positions through communication. The proposed system estimates the region of robots using SURF in fisheye images that have
of image information without merging images. The whole system controls formation of robots based on moving directions and velocities of robots which can be obtained by applying Lucas-Kanade Optical Flow Estimation for the estimated region of robots. We confirmed the reliability of the proposed formation control strategy for multi-robots through both simulation and experiment.
Optimal Optical Mouse Array for High Performance Mobile Robot Velocity Estimation
Kim, Sungbok ; Kim, Hyunbin ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 555~562
DOI : 10.5302/J.ICROS.2013.12.1826
This paper presents the optimal array of optical mice for the accurate velocity estimation of a mobile robot. It is assumed that there can be some restriction on the installation of two or more optical mice at the bottom of a mobile robot. First, the velocity kinematics of a mobile robot with an array of optical mice is derived, which maps the velocity of a mobile robot to the velocities of optical mice. Second, taking into account the consistency in physical units, the uncertainty ellipsoid is obtained to represent the error characteristics of the mobile robot velocity estimation owing to noisy optical mouse measurements. Third, a simple but effective performance index is defined as the inverse of the volume of the uncertainty ellipsoid, which can be used for the optimization of the optimal optical mouse placement. Fourth, simulation results for the optimal placement of three optical mice within a given elliptical region are given.
Optimal Designofa Process-Inventory Network Under Infrequent Shutdowns
Yi, Gyeongbeom ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 563~568
DOI : 10.5302/J.ICROS.2013.13.1897
The purpose of this study is to find the analytic solution for determining the optimal capacity (lot-size) of a batch-storage network to meet the finished product demand under infrequent shutdowns. Batch processes are bound to experience random but infrequent operating time losses. Two common remedies for these failures are duplicating another process or increasing the process and storage capacity, both of which are very costly in modern manufacturing systems. An optimization model minimizing the total cost composed of setup and inventory holding costs as well as the capital costs of constructing processes and storage units is pursued with the framework of a batch-storage network of which flows are susceptible to infrequent shutdowns. The superstructure of the plant consists of a network of serially and/or parallel interlinked batch processes and storage units. The processes transform a set of feedstock materials into another set of products with constant conversion factors.A novel production and inventory analysis method, the PSW (Periodic Square Wave) model, is applied. The advantage of the PSW model stems from the fact it provides a set of simple analytic solutions in spite of a realistic description of the material flow between processes and storage units. The resulting simple analytic solution can greatly enhance a proper and quick investment decision at the early plant design stagewhen confronted with diverse economic situations.
Performance Improvement of a Pedestrian Dead Reckoning System using a Low Cost IMU
Kim, Yun-Ki ; Park, Jae-Hyun ; Kwak, Hwy-Kuen ; Park, Sang-Hoon ; Lee, ChoonWoo ; Lee, Jang-Myung ;
Journal of Institute of Control, Robotics and Systems, volume 19, issue 6, 2013, Pages 569~575
DOI : 10.5302/J.ICROS.2013.12.1767
This paper proposes a method for PDR (Pedestrian Dead-Reckoning) using a low cost IMU. Generally, GPS has been widely used for localization of pedestrians. However, GPS is disabled in the indoor environment such as in buildings. To solve this problem, this research suggests the PDR scheme with an IMU attached to the pedestrian`s waist. However, despite the fact many methods have been proposed to estimate the pedestrian`s position, but their results are not sufficient. One of the most important factors to improve performance is, a new calibration method that has been proposed to obtain the reliable sensor data. In addition to this calibration, the PDR method is also proposed to detect steps, where estimation schemes of step length, attitude, and heading angles are developed. Peak and zero crossings are detected to count the steps from 3-axis acceleration values. For the estimation of step length, a nonlinear step model is adopted to take advantage of using one parameter. Complementary filter and zero angular velocity are utilized to estimate the attitude of the IMU module and to minimize the heading angle drift. To verify the effectiveness of this scheme, a real-time system is implemented and demonstrated. Experimental results show an accuracy of below 1% and below 3% in distance and position errors, respectively, which can be achievable using a high cost IMU.