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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Institute of Intelligent Systems
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Journal DOI :
Korean Institute of Intelligent Systems
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Volume & Issues
Volume 23, Issue 6 - Dec 2013
Volume 23, Issue 5 - Oct 2013
Volume 23, Issue 4 - Aug 2013
Volume 23, Issue 3 - Jun 2013
Volume 23, Issue 2 - Apr 2013
Volume 23, Issue 1 - Feb 2013
Selecting the target year
Pitch Angle Control of Wind Turbine based on Variable PID Gains
Ko, Jung-Min ; Yang, Soo-Youg ; Boo, Chang-Jin ; Kim, Ho-Chan ; Huh, Jong-Chul ; Lee, Junghoon ; Kang, Min-Jae ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 1~6
DOI : 10.5391/JKIIS.2013.23.1.1
For regulating generator speed above the rated wind, versatile methods have been published based on PID. However, these methods with the fixed PID gains could not guarantee that the controller works well in the whole area. In this paper, variable PID gain method has been suggested to overcome this problem. The sensitivity of power to blade pitch angle changes according to wind speed. The variable PID gain function has been derived from this sensitivity.
Personalized Expert-Based Recommendation
Chung, Yeounoh ; Lee, Sungwoo ; Lee, Jee-Hyong ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 7~11
DOI : 10.5391/JKIIS.2013.23.1.7
Taking experts' knowledge to recommend items has shown some promising results in recommender system research. In order to improve the performance of the existing recommendation algorithms, previous researches on expert-based recommender systems have exploited the knowledge of a common expert group for all users. In this paper, we study a problem of identifying personalized experts within a user group, assuming each user needs different kinds and levels of expert help. To demonstrate this idea, we present a framework for using Support Vector Machine (SVM) to find varying expert groups for users; it is shown in an experiment that the proposed SVM approach can identify personalized experts, and that the person-alized expert-based collaborative filtering (CF) can yield better results than k-Nearest Neighbor (kNN) algorithm.
Contact Repulsion of Robotic Foot and Its Influence on Knee and Hip Joints
Kim, Byoung-Ho ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 12~17
DOI : 10.5391/JKIIS.2013.23.1.12
This paper presents a model of bipedal leg mechanism with a compliant foot, and the contact repulsion of the foot for a typical walking pattern and its influence on the knee and hip joints of the leg will be analyzed. This analysis is useful for us to figure out the physical impact of the foot when a walking robot takes a step. Also it can be applied to determine the joint specification of the leg mechanism. As a result, it is shown that the compliance characteristics of a robotic foot can contribute to alleviate the joint torques of the leg affected by the contact repulsion of the foot.
Image Enhancement Based on Local Histogram Specification
Khusanov, Ulugbek ; Lee, Chang-Hoon ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 18~23
DOI : 10.5391/JKIIS.2013.23.1.18
In this paper we propose an image enhancement technique based on histogram specification method over local overlapping regions referred as Local Histogram Specification. First, both reference and original images are splitted into local regions that each overlaps half of its adjacent regions and general histogram specification method is used between corresponding local regions of reference and original image. However it produces noticeable boundary effects. Linear weighted image blending method is used to reduce this effect in order to make seamless image and we also proposed new technique dealing with over-enhanced contrast areas. We satisfied with our experimental results that showed better enhancement accuracy and less noise amplifications compared to other well-known image enhancement methods. We conclude that the proposed method is well suited for motion detection systems as a responsible part to overcome sudden illumination changes.
Development of Child-Sized Humanoid Robot
Lee, Ki-Nam ; Park, Jang-Hyun ; Ryoo, Young-Jae ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 24~28
DOI : 10.5391/JKIIS.2013.23.1.24
In this paper, a procedure of design and development of a child-sized humanoid robot is described. The design concept for a humanoid robot was proposed and the mechanism of the humanoid robot which is more than 1 meter tall was designed by using 3D design tools. By considering the lightweight of the robot, the hardware for the robot was designed for optimal performance. The frames and links of the robot designed by 3D design tools was manufactured through precision machining with the material which is light and have a good strength. The manufactured child-sized humanoid robot was experimented with basic motions applied inverse kinematics and balance control, and the performance of the motions were verified.
Development of a Simulator for a Mobile Robot Based on iPhone
Kim, Dong Hun ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 29~34
DOI : 10.5391/JKIIS.2013.23.1.29
This study presents the remote control of a mobile robot using iPhone based on ad hoc communication. Two control interfaces are proposed to control a mobile robot using iPhone : Remote control by a user and autonomous control. To evaluate the effectiveness of algorithms for trajectory following, a simulator are developed where a virtual robot follows a referenced trajectory in a monitor by iPhone interface. In the proposed simulator, some algorithms are tested how they work well or not for trajectory following of a mobile robot. Comparative results by remote user control and autonomous control are shown. Results of an experiment show that the proposed simulator can be effectively used for testing the effectiveness of autonomous tracking algorithms.
Information Fusion of Cameras and Laser Radars for Perception Systems of Autonomous Vehicles
Lee, Minchae ; Han, Jaehyun ; Jang, Chulhoon ; Sunwoo, Myoungho ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 35~45
DOI : 10.5391/JKIIS.2013.23.1.35
A autonomous vehicle requires improved and robust perception systems than conventional perception systems of intelligent vehicles. In particular, single sensor based perception systems have been widely studied by using cameras and laser radar sensors which are the most representative sensors for perception by providing object information such as distance information and object features. The distance information of the laser radar sensor is used for road environment perception of road structures, vehicles, and pedestrians. The image information of the camera is used for visual recognition such as lanes, crosswalks, and traffic signs. However, single sensor based perception systems suffer from false positives and true negatives which are caused by sensor limitations and road environments. Accordingly, information fusion systems are essentially required to ensure the robustness and stability of perception systems in harsh environments. This paper describes a perception system for autonomous vehicles, which performs information fusion to recognize road environments. Particularly, vision and laser radar sensors are fused together to detect lanes, crosswalks, and obstacles. The proposed perception system was validated on various roads and environmental conditions with an autonomous vehicle.
Adaptive Fault Accommodation Control for Flexible-Joint Robots
Yoo, Sung Jin ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 46~50
DOI : 10.5391/JKIIS.2013.23.1.46
This paper proposes an adaptive fault accommodation control approach for flexible-joint (FJ) robots with multiple actuator faults. It is assumed that the value and occurrence time of multiple actuator faults are unknown. An adaptive fault accommodation control scheme with prescribed performance bounds, which characterize the convergence rate and maximum overshoot of tracking errors, is designed to accommodate the actuator faults. From the Lyapunov stability theorem, it is proved that all signals of the closed-loop system are semi-globally uniformly ultimately bounded and tracking errors are preserved within prescribed performance bounds regardless of actuator faults.
A Study on Walking Stabilization and Path Tracking of Biped Robot Using RFID
Park, Jong-Han ; Kim, Yong-Tae ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 51~56
DOI : 10.5391/JKIIS.2013.23.1.51
In order to apply a biped robot in real world, the robot requires a robust walking and a function of localization, path planning and navigation. Recently, localization and path planning using RFID of mobile robot has been studying. However, when the biped robot walks, it has unstability and tends to leave the path. In the paper we propose a method of walking stabilization using FSR(Force Sensing Resistor), Gyro and accelerometer for the real biped robot. Also a path tracking algorithm using RFID sensor attached in robot's foot is proposed based on localization of the robot. The proposed algorithm is verified from walking experiments using real biped robot on uneven terrain and path tracking experiments on the RFID environments.
A Color-Based Medicine Bottle Classification Method Robust to Illumination Variations
Kim, Tae-Hun ; Kim, Gi-Seung ; Song, Young-Chul ; Ryu, Gang-Soo ; Choi, Byung-Jae ; Park, Kil-Houm ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 57~64
DOI : 10.5391/JKIIS.2013.23.1.57
In this paper, we propose the classification method of medicine bottle images using the features with color and size information. It is difficult to classify with size feature only, because there are many similar sizes of bottles. Therefore, we suggest a classification method based on color information, which robust to illumination variations. First, we extract MBR(Minimum Boundary Rectangle) of medicine bottle area using Binary Threshold of Red, Green, and Blue in image and classify images with size. Then, hue information and RGB color average rate are used to classify image, which features are robust to lighting variations. Finally, using SURF(Speed Up Robust Features) algorithm, corresponding image can be found from candidates with previous extracted features. The proposed method makes to reduce execution time and minimize the error rate and is confirmed to be reliable and efficient from experiment.
Sampled-Data Fault Detection Observer Design of Takagi-Sugeno Fuzzy Systems
Jee, Sung Chul ; Lee, Ho Jae ; Kim, Do Wan ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 65~71
DOI : 10.5391/JKIIS.2013.23.1.65
In this paper, we address fault detection observer design problem of T-S fuzzy systems with sensor fault. To detect fault, T-S fuzzy model-based observer is used. By introducing
_ performance index, an observer is designed as sensitive to fault as possible. The fault is then detected by a fault decision logic. The design conditions are derived in terms of linear matrix inequalities. An illustrative example is provided to verify the effectiveness of the proposed fault detection technique.
Pattern Analysis of Maximum Power Point by means of Solar Cell Module Array Simulation
Jeong, Ji-Won ; Park, In-Gyu ; Hwang, Kuk-Yeon ; Ahn, Tae-Chon ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 72~79
DOI : 10.5391/JKIIS.2013.23.1.72
In the paper, a pattern analysis to decide whether the 1st local peak power point near open circuit voltage is the global peak power point or not, in case that the voltage and current at the 1st local peak power point are in a specific range, for Maximum Power Point Tracking on the photo voltaic power conversion system. When a solar cell panel array is shaded partially, multi-local peak power points can occur. That makes it hard to search the global peak power point. Through Tableau analysis using by piecewise linear solar cell model, V-I characteristic of a solar cell panel array circuit when partial shading problem happens, is simulated. The global peak power and the local peak power points is confirmed by simulations. Voltage and current values and patterns of V-I characteristic are analyzed. The generating efficiency of the solar cell panel array is improved, when the solar cell panel array circuit is operated at the power point estimated by setting up specific range.
Closures and Interiors Redefined, and Some Types of Compactness in Ordinary Smooth Topological Spaces
Lee, Jeong Gon ; Lim, Pyung Ki ; Hur, Kul ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 80~86
DOI : 10.5391/JKIIS.2013.23.1.80
We give a new definition of ordinary smooth closure and ordinary smooth interior of an ordinary subset in an ordinary smooth topological space which have almost all the properties of the corresponding operators in a classical topological space. As a consequence of these definitions we reduce the additional hypotheses in the results of  and also generalize several properties of the types of compactness in .
Intelligent Digital Public Address System using Agent Based on Network
Kim, Jung-Sook ;
Journal of Korean Institute of Intelligent Systems, volume 23, issue 1, 2013, Pages 87~92
DOI : 10.5391/JKIIS.2013.23.1.87
In this paper, we developed a digital and integrated PA(Public Address) system with speech recognition and sensor connection based on IP with an ID using agent. It has facilities such as an external input, a microphone and a radio for a PA system and has speech recognition. If "fire" is spoken to the PA system then it can recognize the emergency situation and will broadcast information to the appropriate agency immediately. In addition to that, many sensors, such as temperature, humidity, and infrared, etc., can be connected to the PA system and can be integrated with the context awareness which contains many types of information about internal statuses using inference agent. Also, developed the digital integrated PA system will make it possible to broadcast the message to adaptable places using network IP based on IDs. Finally, the digital PA system is designed for operation from a PC, which makes installation and setting of operating parameters very simple and user-friendly. For implementation details, we implemented thread based concurrent processing for the events which occur concurrently from many sensors or users.