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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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Korean Institute of Intelligent Systems
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Volume & Issues
Volume 22, Issue 6 - Dec 2012
Volume 22, Issue 5 - Oct 2012
Volume 22, Issue 4 - Aug 2012
Volume 22, Issue 3 - Jun 2012
Volume 22, Issue 2 - Apr 2012
Volume 22, Issue 1 - Feb 2012
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Robust Fuzzy Controller for Active Magnetic Bearing System with 6-DOF
Sung, Hwa-Chang ; Park, Jin-Bae ; Joo, Young-Hoon ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 267~272
DOI : 10.5391/JKIIS.2012.22.3.267
This paper propose the implementation of robust fuzzy controller for controlling an active magnetic bearing (AMB) system with 6 degree of freedom (DOF). A basic model with 6 DOF rotor dynamics and electromagnetic force equations for conical magnetic bearings is proposed. The developed model has severe nonlinearity and uncertainty so that it is not easy to obtain the control objective. For solving this problem, we use the Takagi-Sugeno (T-S) fuzzy model which is suitable for designing fuzzy controller. The control object in the AMB system enables the rotor to rotate without any phsical contact by using magnetic force. In this paper, we analyze the nonlinearity of the active magnetic bearing system by using fuzzy control algorithm and desing the robust control algorithm for solving the parameter variation. Simulation results for AMB are demonstrated to visualize the feasibility of the proposed method.
Development of an Ubiquitous Healthcare System based on Health Information Exchange Standards
Lee, In-Keun ; Kim, Hwa-Sun ; Cho, Hune ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 273~280
DOI : 10.5391/JKIIS.2012.22.3.273
As changed the clinical environment, the interest on u-Healthcare service and systems has been increased. The ubiquitous healthcare(u-Healthcare) systems are constructed at the integrated environment that consists of various devices and systems basically such as personal health devices(PHDs) measuring body signals, information aggregators gathering the data transmitted from PHDs through wireless technology, and health information systems storing and managing personal health information transmitted from the information aggregators. International standards such as IEEE 11073 and HL7 have been specified for the interoperability of PHDs and health information systems, but the research on u-Healthcare systems that were developed and applied in the real clinical environment by adopting the standards was rarely conducted. Therefore, we developed an u-Healthcare system which can manage personal health information, such as blood glucose, blood pressure, and body composition, based on health information exchange standards. Moreover, we verified the stability of the developed system through clinical trial in patients with endocrine disease at the Kyungpook National University Hospital, and listed problems occurred during clinical trial and found their solutions.
Development of Intelligent Green Fountain Culture System for Healthy Emotional Self-Concept
Park, Seung-Min ; Lee, Young-Hwan ; Kim, Jun-Yeup ; Ko, Kwang-Eun ; Sim, Kwee-Bo ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 281~286
DOI : 10.5391/JKIIS.2012.22.3.281
In the growing standard of people's lives, we want desire to create eco-friendly water space what is called the Green Technology that is in the limelight. These green space is introduced the cultural contents and we use the water, music, and nature as tool of emotional verbalism. Presently, when we want to make scenario, water landscape scenario is made by director. but these systems have some disadvantages as the cost and limitation of direction. There is a growing interest in the integrated control system based on PC and Internet. In this paper, it is about fountain control system. Previous research area was only one using programmable logic controller or industrial PC. we proposed the development of intelligent green fountain culture system for healthy emotional self-concept. And we made automatic weather sensing system that is designed by the intelligent green fountain culture system to estimate the time-variant system.
An Efficient Image Registration Based on Multidimensional Intensity Fluctuation
Cho, Yong-Hyun ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 287~293
DOI : 10.5391/JKIIS.2012.22.3.287
This paper presents an efficient image registration method by measuring the similarity, which is based on multi-dimensional intensity fluctuation. Multi-dimensional intensity which considers 4 directions of the image, is applied to reflect more properties in similarity decision. And an intensity fluctuation is also applied to measure comprehensively the similarity by considering a change in brightness between the adjacent pixels of image. The normalized cross-correlation(NCC) is calculated by considering an intensity fluctuation to each of 4 directions. The 5 correlation coefficients based on the NCC have been used to measure the registration, which are total NCC, the arithmetical mean and a simple product on the correlation coefficient of each direction and on the normalized correlation coefficient by the maximum NCC, respectively. The proposed method has been applied to the problem for registrating the 22 face images of 243*243 pixels and the 9 person images of 500*500 pixels, respectively. The experimental results show that the proposed method has a superior registration performance that appears the image properties well. Especially, the arithmetical mean on the correlation coefficient of each direction is the best registration measure.
Shape, Volume Prediction Modeling and Identical Weights Cutting for Frozen Fishes
Hyun, Soo-Hwan ; Lee, Sung-Choon ; Kim, Kyung-Hwan ; Seo, Ki-Sung ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 294~299
DOI : 10.5391/JKIIS.2012.22.3.294
This paper suggests a modeling technique for shape and volume prediction of fishes to cut them with identical weights for group meals. The measurement and prediction of frozen fishes for group meals are very difficult because they have a bending deformation occurring at frozen stage and a hollow by eliminating the internals. Besides there exist twinkles problem of surface caused by freeze and variable weights by moisture conditions. Therefore a complex estimation algorithm is necessary to predict the shape and volume prediction of fishes exactly. Hollow prediction, pattern classification and modeling for tails using neural network, integration based volume prediction algorithm are suggested and combined to solve those problems. In order to validate the proposed method, the experiments of 3-dimensional measurement, volume prediction and fish cutting for spanish mackerel, saury, and mackerel are executed. The cutting experiments for real fish are executed.
A Nonlinear Observer Design for Estimating State-of-Charge of Lithium Polymer Battery
Yoo, Seog-Hwan ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 300~304
DOI : 10.5391/JKIIS.2012.22.3.300
This paper presents a nonlinear observer design method for SOC(state-of-charge) estimation of Lithium polymer battery cell. The dynamic equation of the battery cell is modeled as a simple RC electrical circuit with a nonlinear voltage source and the parameters are obtained via nonlinear optimization. Using the sum of squares decomposition, the observer gain is designed such that the error dynamics is asymptotically stable and the decay rate is below the prescribed value. In order to illustrate the performance of the observer, a computer simulation is performed using the experimental data with the UDDS(urban dynamometer driving schedule) current profile.
Gait Generation for Quadruped Robots Using Body Sways
Jung, Hak-Sang ; Kim, Guk-Hwa ; Choi, Yoon-Ho ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 305~311
DOI : 10.5391/JKIIS.2012.22.3.305
In this paper, we propose a gait generation method for quadruped robots using the xz-axis sway of the quadruped robot, which minimizes the shake of the quadruped robot and maximizes the stability margin. In the proposed method, the gait is generated based on wave gaits and the stability analysis uses the body tilt information of the quadruped robot according to the leg's height of leg. In addition, to reduce the impact on the body caused by the z-axis sway while walking, the proposed method generates the smooth walking movement trajectory with less impact by using Fourier series. Finally, to verify the applicability and effectiveness of the proposed method, we carry out the computer simulations and the real walking experiments with the implemented quadruped robot.
Development of Underwater-type Autonomous Marine Robot-kit
Kim, Hyun-Sik ; Kang, Hyung-Joo ; Ham, Youn-Jae ; Park, Seung-Soo ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 312~318
DOI : 10.5391/JKIIS.2012.22.3.312
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 underwater-type autonomous marine robot kit for the marine robot competition, which has the abilities of the underwater locomotion and target detection and avoidance. To solve this problem, a marine robot kit which has the abilities of the underwater locomotion, the waterproof and the weight adjustment, is developed. To verify the performance of the developed kit, test and evaluation such as surge, pitch, yaw, obstacle avoidance is performed. The test and evaluation results show that the possibility of the real applications of the developed kit.
Two-Stage Neural Networks for Sign Language Pattern Recognition
Kim, Ho-Joon ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 319~327
DOI : 10.5391/JKIIS.2012.22.3.319
In this paper, we present a sign language recognition model which does not use any wearable devices for object tracking. The system design issues and implementation issues such as data representation, feature extraction and pattern classification methods are discussed. The proposed data representation method for sign language patterns is robust for spatio-temporal variances of feature points. We present a feature extraction technique which can improve the computation speed by reducing the amount of feature data. A neural network model which is capable of incremental learning is described and the behaviors and learning algorithm of the model are introduced. We have defined a measure which reflects the relevance between the feature values and the pattern classes. The measure makes it possible to select more effective features without any degradation of performance. Through the experiments using six types of sign language patterns, the proposed model is evaluated empirically.
Method for Detection and Identification of Satellite Anomaly Based on Pseudorange
Seo, Ki-Yeol ; Park, Sang-Hyun ; Jang, Won-Seok ; Kim, Young-Ki ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 328~333
DOI : 10.5391/JKIIS.2012.22.3.328
Current differential GPS (DGPS) system consists of reference station (RS), integrity monitor (IM), and control station (CS). The RS computes the pseudorange corrections (PRC) and generates the RTCM messages for broadcasting. The IM receives the corrections from the RS broadcasting and verifies that the information is within tolerance. The CS performs realtime system status monitoring and control of the functional and performance parameters. The primary function of a DGPS integrity monitor is to verify the correction information and transmit feedback messages to the reference station. However, the current algorithms for integrity monitoring have the limitations of integrity monitor functions for satellite outage or anomalies. Therefore, this paper focuses on the detection and identification methods of satellite anomalies for maritime DGPS RSIM. Based on the function analysis of current DGPS RSIM, it first addresses the limitation of integrity monitoring functions for DGPS RSIM, and then proposes the detection and identification method of satellite anomalies. In addition, it simulates an actual GPS clock anomaly case using a GPS simulator to analyze the limitations of the integrity monitoring function. It presents the brief test results using the proposed methods for detection and identification of satellite anomalies.
Study on How to Display S-57 ENCs in a Embeded Mobile-Platform
Jo, Gi-Jong ; Lee, Ju-Hwan ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 334~340
DOI : 10.5391/JKIIS.2012.22.3.334
This project defines Tiled-SENC format for S-57 ENC data usage of the mobile platforms and low-end terminals which are not included in ECDIS carriage requirements of SOLAS Chapter V. Also, the architecture modeling and converting technology of Tiled-SENC have been developed and the performance has been compared with ENC Format.
Extraction of Transverse Abdominis Muscle form Ultrasonographic Images
Kim, Kwang-Baek ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 341~346
DOI : 10.5391/JKIIS.2012.22.3.341
In rehabilitation where ultrasonographic diagnosis is not popular, it could be subjective by medical expert's experience. Thus, it is necessary to develop an objective automative procedure in ultrasonic image analysis. A disadvantage of existing automative analytic procedure in musculoskeletal system is to designate an incorrect muscle area when the figure of fascia is vague. In this study, we propose a new procedure to extract more accurate muscle area in abdomen ultrasonic image for that purpose. After removing unnecessary noise from input image, we apply End-in Search algorithm to enhance the contrast between fascia and muscle area. Then after extracting initial muscle area by Up-Down search, we trace the fascia area with a mask based on morphological and directional information. By this tracing of mask movements, we can emphasize the fascia area to extract more accurate muscle area in result. This new procedure is proven to be more effective than existing methods in experiment using convex ultrasound images that are used in real world rehabilitation diagnosis.
Modeling and Analysis of Robotic Foot Mechanism Based on Truss Structure
Kim, Byoung-Ho ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 347~352
DOI : 10.5391/JKIIS.2012.22.3.347
This paper presents a robotic foot mechanism based on truss structure for walking robots and analyzes its effectiveness for compliant walking. The specified foot mechanism has been modeled by observing the structure and behavior of human foot. The frame of bone used in the human foot is considered as a truss, and the ligaments of the human foot are represented as a simple stiffness element. So such a robotic foot has an advantage to moderate the impact of foot when a walking robot takes a step. As a result, it is practically expected that the proposed robotic foot mechanism can contribute to reduce the physical fatigue of walking robots.
Simultaneous Estimation of Landmark Location and Robot Pose Using Particle Filter Method
Kim, Tae-Gyun ; Ko, Nak-Yong ; Noh, Sung-Woo ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 353~360
DOI : 10.5391/JKIIS.2012.22.3.353
This paper describes a SLAM method which estimates landmark locations and robot pose simultaneously. The particle filter can deal with nonlinearity of robot motion as well as the non Gaussian property of robot motion uncertainty and sensor error. The state to be estimated includes the locations of landmarks in addition to the robot pose. In the experiment, four beacons which transmit ultrasonic signal are used as landmarks. The robot receives the ultrasonic signals from the beacons and detects the distance to them. The method uses rang scanning sensor to build geometric feature of the environment. Since robot location and heading are estimated by the particle filter, the scanned range data can be converted to the geometric map. The performance of the method is compared with that of the deadreckoning and trilateration.
Speed Control for Electric Motorcycle Using Fuzzy Controller
Ban, Dong-Hoon ; Park, Jong-Oh ; Lim, Young-Do ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 361~366
DOI : 10.5391/JKIIS.2012.22.3.361
This paper presents speed control of an electric motorcycle using a fuzzy controller. The electric motorcycle required to meet not only fast throttle response but also stability, when it is on a cruise. However, a 1.5KW (50cc) electric motorcycles selling in the current market are difficult to cruise under the following conditions which are occupant's weight, load weight, wind resistance and road conditions (dirt roads, asphalt road). Because of these reasons, the rapid speed changing occurs in uphill and downhill road. To solve these problems, The input value for Improved fuzzy controller use the speed error and error variance. The output value for improved fuzzy controller uses Q-axis of the motor controlled variable. The D-axis of the motor output for improved fuzzy control uses D-axis controlled variable in proportional to Q-axis controlled variable. Improved fuzzy controller drives the electric motorcycle equipped with IPMSM. The control subject used in this paper is a 1.5KW electric motorcycle equipped with improved fuzzy controller that was used to control the motor speed. To control IPMSM Type of motor torque, D, Q-axis current controller was used. The Fuzzy controller using the proposed algorithm is demonstrated by experimental hardware simulator.
Positioning Accuracy Improvement of Analog-type Magnetic Positioning System using Fuzzy Inference System
Kim, Jung-Min ; Jung, Kyung-Hoon ; Jung, Eun-Kook ; Cho, Hyun-Hak ; Kim, Sung-Shin ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 367~372
DOI : 10.5391/JKIIS.2012.22.3.367
This paper presents a development of an analog type magnetic positioning system and its positioning accuracy improvement using fuzzy inference system. As the magnetic positioning system used on a magnet-gyro guidance system for AGV(automatic guided vehicle), it measures a position of magnet embedded in floor of the work place. The existing product of the magnetic positioning system is very expensive in Korea because it is being sold in a foreign country exclusively. Moreover, the positioning accuracy of the product is low because it uses digital type unipolar hall sensors. Hence, we developed the magnetic positioning system by ourselves and improved the positioning accuracy of the developed magnetic positioning system using fuzzy inference system. For experiment, we used the analog type magnetic positioning system which we have developed, and compared the performance of the proposed method with the performance of the existing positioning method for the magnetic positioning system. In experimental results, we verified that the proposed method improved the positioning accuracy of the magnetic positioning system.
A Quantitative Collision Probability Analysis in Port Waterway
Jeong, Jung-Sik ; Kim, Kwang-Il ; Park, Gyei-Kark ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 373~378
DOI : 10.5391/JKIIS.2012.22.3.373
In terms of the maritime accident prevention, risk analysis at targeted warterways is important for planning safety waterways. This paper analyzes the maritime accidents probability in the Mokpo waterways, South Korea, based on the IWRAP(IALA Waterway Risk Assessment) of the quantitative accident probability tool. Vessel collision probability cate is calculated by vessels meeting direction, using IWRAP. This paper contribute to advance improvement of vessel traffic service by VTS sector providing vessel fairway risk data.
A Study on Development of Visual Navigational Aids to improve Maritime Situation Awareness
Kim, Eun-Kyung ; Im, Nam-Kyun ; Han, Song-Hee ; Jeong, Jung-Sik ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 379~385
DOI : 10.5391/JKIIS.2012.22.3.379
This paper developes the navigation visual aid supporting a watch officer's situation awareness and analyzes its performance test result. Developing the equipment made from composite video sensor which transfer video signal, ranger laser measurement model which search out distance, Pan/ Tilt, center control device. The developed equipment with Pan/Tilt was made from high performance video sensor and ranger laser measurement. To make a real ship test, we carried on setting the developed equipment on ship, observed a danger factor and analyzed a image, and from that we can evaluate marine environment awareness. Through this result, the developed equipment can show effective ability of the awareness of the clearer check and resolution situation when compare with the binocular.
An Investigation on Dynamic Portfolio Selection Problems Utilizing Stochastic Receding Horizon Approach
Park, Joo-Young ; Jeong, Jin-Ho ; Park, Kyung-Wook ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 386~393
DOI : 10.5391/JKIIS.2012.22.3.386
Portfolio selection methods based on stochastic receding horizon approach, which were recently reported in the field of financial engineering, can explicitly consider the dynamic characteristics of wealth evolution and various constraints in the process of performing optimal portfolio selection. In view of the theoretical value, versatility, and effectiveness that receding horizon approach has achieved in many engineering problems, dynamic portfolio selection methods based on stochastic receding horizon optimization technique have the possibility of becoming an important breakthrough. This paper observes through theoretical investigations that the SDP(semi-definite program)-based portfolio selection procedure can be simplified, and has obtained meaningful performance on returns from simulation studies applying the simplified version to Korean financial markets.
Bipolar fuzzy ideals of Near Rings
Baik, Hyoung-Gu ;
Journal of Korean Institute of Intelligent Systems, volume 22, issue 3, 2012, Pages 394~398
DOI : 10.5391/JKIIS.2012.22.3.394
Based on the theory of a bipolar fuzzy set, the notion of a bipolar fuzzy subring/ideal of a Near ring is introduced and related properties are investigated. Characterizations of a bipolar fuzzy subnear ring and a bipolar fuzzy ideal in near ring are established. Relations between a bipolar fuzzy ideal and a level cut are discussed. Using bipolar fuzzy ideals, we discuss characterizations of Noetherian Near ring.