405 results on '"Kwee-Bo Sim"'
Search Results
102. Symmetrical feature for interpreting motor imagery EEG signals in the brain–computer interface
- Author
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Woo-Young Lee, Pharino Chum, Kwee-Bo Sim, Seung-Min Park, and Xinyang Yu
- Subjects
Computer science ,business.industry ,Interface (computing) ,0206 medical engineering ,Feature extraction ,Pattern recognition ,02 engineering and technology ,Perceptron ,Class discrimination ,020601 biomedical engineering ,Signal ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,03 medical and health sciences ,0302 clinical medicine ,Motor imagery ,Feature (computer vision) ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,030217 neurology & neurosurgery ,Brain–computer interface - Abstract
Feature extraction is an important issue of brain–computer interface (BCI). It determines whether the classification performance is high or low. In this paper, a new type of feature called “symmetrical feature” is proposed. This innovative feature extraction method is built upon the features “common spatial pattern (CSP)” algorithm. After an electroencephalographic signal is enhanced, class discrimination using the CSP algorithm can be extracted using optimal symmetrical axis chosen by a 10-fold cross-validation technique. Simulation results from nine data sets provided by brain–computer interface competition III and Iva showed that, on average, the proposed symmetrical feature can be combined with the CSP power band feature to boost the performance of the classification in a BCI system.
- Published
- 2017
103. Mobile Robot Control using Smart Phone for internet of Things
- Author
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Seong-In Ahn, Je-Hun Yu, Sung-Won Lee, and Kwee-Bo Sim
- Subjects
Smart phone ,Mobile phone tracking ,business.industry ,Computer science ,020208 electrical & electronic engineering ,Mobile robot control ,02 engineering and technology ,Embedded system ,Mobile station ,0202 electrical engineering, electronic engineering, information engineering ,GSM services ,Internet of Things ,business ,Computer network - Published
- 2016
104. Heuristic feature extraction method for BCI with harmony search and discrete wavelet transform
- Author
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Seung-Min Park, Kwee-Bo Sim, and Tae-Ju Lee
- Subjects
Discrete wavelet transform ,0209 industrial biotechnology ,Lifting scheme ,business.industry ,Second-generation wavelet transform ,Stationary wavelet transform ,Wavelet transform ,Pattern recognition ,02 engineering and technology ,Computer Science Applications ,Wavelet packet decomposition ,03 medical and health sciences ,020901 industrial engineering & automation ,0302 clinical medicine ,Wavelet ,Control and Systems Engineering ,Filter (video) ,Artificial intelligence ,business ,030217 neurology & neurosurgery ,Mathematics - Abstract
For the brain-computer interface system (BCI), pre-processing has an important role to ensure system performance. However, the speech recognition system using electroencephalogram (EEG) is weak against temporal effects. Therefore, in general cases, wavelet transform has been used to cope with the temporal effects and non-stationary characteristic of EEG. The discrete version of wavelet transform, called DWT, requires a filter of the system for use in downsampling the signal. In other words, it is important to determine the suitable type of filter. In many cases, it is difficult to find an adequate filter for DWT because of differences in the characteristics of the input signal. In this paper, we proposed a heuristic approach to finding the optimal filter of the system for EEG signals. The harmony search algorithm (HSA) was used for finding of the optimal filter. In the learning process with the EEG system, the optimal wavelet filter could be found, which is automatically designed for subject personality.
- Published
- 2016
105. Classification of color imagination using Emotiv EPOC and event-related potential in electroencephalogram
- Author
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Je-Hun Yu and Kwee-Bo Sim
- Subjects
Imagination ,Artificial neural network ,medicine.diagnostic_test ,Computer science ,business.industry ,Headset ,media_common.quotation_subject ,05 social sciences ,Pattern recognition ,Electroencephalography ,Stimulus (physiology) ,050105 experimental psychology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,03 medical and health sciences ,0302 clinical medicine ,Event-related potential ,medicine ,0501 psychology and cognitive sciences ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,030217 neurology & neurosurgery ,Brain–computer interface ,media_common - Abstract
In this paper, we proposed a method that classifies electroencephalography (EEG) from color imagination data using the Emotiv EPOC headset. For EEG measurement and the event-related potential (ERP) method, brain-computer interface (BCI) systems were used in the experiment. In the experiment, the subjects gaze at a non-flicker visual stimulus of color (i.e., red, green, blue, white, and yellow) and then proceed to imagine the color. To concentrate on the LED light, all experiments were performed in a dimly lit room. The flickered visual stimulus was made using an Arduino microcontroller board and LEDs with the purpose of prompting color imagination. As a result, we obtained significant EEG responses of thoughts related to certain colors. The EEG response is classified using classification algorithms including a support vector machine (SVM) with linear discriminant analysis (LDA), an artificial neural network (ANN) with LDA, and an ANN without LDA. In addition, five-fold cross validation was used to evaluate the performance. From the results, we found robust electrodes (T7 and F4). The technology developed in this paper can be used to assist paralyzed individuals and the elderly.
- Published
- 2016
106. One Time Password-Based SEED Algorithm for IoT Systems
- Author
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Kwee-Bo Sim, Seung-min Park, and Sung-Won Lee
- Subjects
Control and Systems Engineering ,business.industry ,Computer science ,Applied Mathematics ,Information security ,Internet of Things ,business ,One-time password ,Software ,Computer network - Published
- 2016
107. An Implementation of Smart Dormitory System Based on Internet of Things
- Author
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Hwa-Mun Ko, Woo-Young Lee, Je-Hun Yu, and Kwee-Bo Sim
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World Wide Web ,Computer science ,business.industry ,Internet of Things ,business ,Simulation - Published
- 2016
108. Autonomous Mobile Robot Control using the Wearable Devices Based on EMG Signal for detecting fire
- Author
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Je-Hun Yu, Kwee-Bo Sim, Woo-Young Lee, and Jin-Woo Kim
- Subjects
business.industry ,Computer science ,020206 networking & telecommunications ,Mobile robot ,Mobile robot control ,02 engineering and technology ,Signal ,Human–robot interaction ,Gesture recognition ,0202 electrical engineering, electronic engineering, information engineering ,Computer vision ,Artificial intelligence ,business ,Wearable technology - Published
- 2016
109. Fruit Fly Optimization based EEG Channel Selection Method for BCI
- Author
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Kwee-Bo Sim, Je-Hun Yu, and Xinyang Yu
- Subjects
Engineering ,business.industry ,Applied Mathematics ,Interface (computing) ,010401 analytical chemistry ,Particle swarm optimization ,020206 networking & telecommunications ,Pattern recognition ,02 engineering and technology ,Overfitting ,Linear discriminant analysis ,Machine learning ,computer.software_genre ,01 natural sciences ,0104 chemical sciences ,Motor imagery ,Control and Systems Engineering ,Genetic algorithm ,0202 electrical engineering, electronic engineering, information engineering ,Artificial intelligence ,business ,computer ,Software ,Communication channel ,Brain–computer interface - Abstract
A brain–computer interface or BCI provides an alternative method for acting on the world. Brain signals can be recorded from the electrical activity along the scalp using an electrode cap. By analyzing the EEG, it is possible to determine whether a person is thinking about his/her hand or foot movement and this information can be transferred to a machine and then translated into commands. However, we do not know which information relates to motor imagery and which channel is good for extracting features. A general approach is to use all electronic channels to analyze the EEG signals, but this causes many problems, such as overfitting and problems removing noisy and artificial signals. To overcome these problems, in this paper we used a new optimization method called the Fruit Fly optimization algorithm (FOA) to select the best channels and then combine them with CSP method to extract features to improve the classification accuracy by linear discriminant analysis. We also used particle swarm optimization (PSO) and a genetic algorithm (GA) to select the optimal EEG channel and compared the performance with that of the FOA algorithm. The results show that for some subjects, the FOA algorithm is a better method for selecting the optimal EEG channel in a short time.
- Published
- 2016
110. Facial Point Classifier using Convolution Neural Network and Cascade Facial Point Detector
- Author
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Kwee-Bo Sim, Kwang-Eun Ko, and Je-Hun Yu
- Subjects
business.industry ,Computer science ,Applied Mathematics ,Point detector ,020207 software engineering ,02 engineering and technology ,Convolutional neural network ,Human–robot interaction ,Control and Systems Engineering ,Cascade ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Computer vision ,Artificial intelligence ,business ,Classifier (UML) ,Software - Published
- 2016
111. Face Classification Using Cascade Facial Detection and Convolutional Neural Network
- Author
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Kwee-Bo Sim and Je-Hun Yu
- Subjects
business.industry ,Machine vision ,Computer science ,Detector ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,020206 networking & telecommunications ,02 engineering and technology ,USB ,Convolutional neural network ,law.invention ,Sight ,Cascade ,law ,Face (geometry) ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Computer vision ,Artificial intelligence ,Face detection ,business - Abstract
Nowadays, there are many research for recognizing face of people using the machine vision. the machine vision is classification and analysis technology using machine that has sight such as human eyes. In this paper, we propose algorithm for classifying human face using this machine vision system. This algorithm consist of Convolutional Neural Network and cascade face detector. And using this algorithm, we classified the face of subjects. For training the face classification algorithm, 2,000, 3,000, and 4,000 images of each subject are used. Training iteration of Convolutional Neural Network had 10 and 20. Then we classified the images. In this paper, about 6,000 images was classified for effectiveness. And we implement the system that can classify the face of subjects in realtime using USB camera.
- Published
- 2016
112. EEG Feature Classification Based on Grip Strength for BCI Applications
- Author
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Je-Hun Yu, Dong-Eun Kim, and Kwee-Bo Sim
- Subjects
medicine.diagnostic_test ,Logic ,Computer science ,business.industry ,Speech recognition ,Interface (computing) ,Pattern recognition ,Electroencephalography ,Computer Science Applications ,Support vector machine ,Grip strength ,ComputingMethodologies_PATTERNRECOGNITION ,Computational Theory and Mathematics ,Eeg data ,Artificial Intelligence ,Signal Processing ,Feature (machine learning) ,medicine ,Artificial intelligence ,EEG feature ,business ,Brain–computer interface - Abstract
Braincomputer interface (BCI) technology is making advances in the field of humancomputer interaction (HCI). To improve the BCI technology, we study the changes in the electroencephalogram (EEG) signals for six levels of grip strength: 10%, 20%, 40%, 50%, 70%, and 80% of the maximum voluntary contraction (MVC). The measured EEG data are categorized into three classes: Weak, Medium, and Strong. Features are then extracted using power spectrum analysis and multiclass-common spatial pattern (multiclass-CSP). Feature datasets are classified using a support vector machine (SVM). The accuracy rate is higher for the Strong class than the other classes.
- Published
- 2015
113. Real-time Streaming and Remote Control for the Smart Door-Lock System based on Internet of Things
- Author
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Kwee-Bo Sim, Je-Hun Yu, and Sung-Won Lee
- Subjects
Engineering ,Record locking ,Smart phone ,Multimedia ,business.industry ,Big data ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,computer.software_genre ,law.invention ,Raspberry pi ,law ,Embedded system ,business ,Internet of Things ,computer ,Remote control - Abstract
In this paper, we implemented the smart door lock system that control remotely devices using the concept of internet of things. Internet of things is intelligent system that can help devices to communicate with people and devices. And recently internet of things is getting attention because of advance of hardware technology and big data. The smart doorlock system based on internet of things used raspberry pi, sensor and doorlock. Using the smart phone, doorlock can be controlled from the raspberry pi server. And the user can identify some people that is in front of doorlock. also user can check around of doorlock in realtime using the raspberry pi camera.
- Published
- 2015
114. Advanced Parameter-Setting-Free Harmony Search Algorithm
- Author
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Seung-Min Park, Zong Woo Geem, Yong-Woon Jeong, and Kwee-Bo Sim
- Subjects
Scheme (programming language) ,Computer science ,0208 environmental biotechnology ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,metaheuristic ,02 engineering and technology ,lcsh:Technology ,lcsh:Chemistry ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,lcsh:QH301-705.5 ,Instrumentation ,Metaheuristic ,computer.programming_language ,Fluid Flow and Transfer Processes ,lcsh:T ,Process Chemistry and Technology ,General Engineering ,HS algorithm ,lcsh:QC1-999 ,020801 environmental engineering ,Computer Science Applications ,parameter setting free ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,harmony search ,Harmony search ,020201 artificial intelligence & image processing ,lcsh:Engineering (General). Civil engineering (General) ,computer ,Algorithm ,lcsh:Physics - Abstract
In this paper, we propose an advanced parameter-setting-free (PSF) scheme to solve the problem of setting the parameters for the harmony search (HS) algorithm. The use of the advanced PSF method solves the problems of the conventional PSF scheme that results from a large number of iterations and shows good results compared to fixing the parameters required for the HS algorithm. In addition, unlike the conventional PSF method, the advanced PSF method does not use additional memory. We expect the advanced PSF method to be applicable to various fields that use the HS algorithm because it reduces the memory utilization for operations while obtaining better results than conventional PSF schemes.
- Published
- 2020
115. Robot Control based on Steady-State Visual Evoked Potential using Arduino and Emotiv Epoc
- Author
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Je-Hun Yu and Kwee-Bo Sim
- Subjects
Steady state (electronics) ,Computer science ,Arduino ,Evoked potential ,Simulation ,Robot control - Published
- 2015
116. EEG Feature Classification for Precise Motion Control of Artificial Hand
- Author
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Kwee-Bo Sim, Je-Hun Yu, and Dong-Eun Kim
- Subjects
Computer science ,business.industry ,Pattern recognition ,Computer vision ,Artificial hand ,Artificial intelligence ,EEG feature ,Motion control ,business - Published
- 2015
117. Vowel Classification of Imagined Speech in an Electroencephalogram using the Deep Belief Network
- Author
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Kwee-Bo Sim and Tae-Ju Lee
- Subjects
Imagined speech ,business.industry ,Computer science ,Applied Mathematics ,Speech recognition ,Feature vector ,Deep learning ,Multiclass classification ,Deep belief network ,Control and Systems Engineering ,International Phonetic Alphabet ,Vowel ,Artificial intelligence ,business ,Software ,Brain–computer interface - Abstract
In this paper, we found the usefulness of the deep belief network (DBN) in the fields of brain-computer interface (BCI), especially in relation to imagined speech. In recent years, the growth of interest in the BCI field has led to the development of a number of useful applications, such as robot control, game interfaces, exoskeleton limbs, and so on. However, while imagined speech, which could be used for communication or military purpose devices, is one of the most exciting BCI applications, there are some problems in implementing the system. In the previous paper, we already handled some of the issues of imagined speech when using the International Phonetic Alphabet (IPA), although it required complementation for multi class classification problems. In view of this point, this paper could provide a suitable solution for vowel classification for imagined speech. We used the DBN algorithm, which is known as a deep learning algorithm for multi-class vowel classification, and selected four vowel pronunciations:, /a/, /i/, /o/, /u/ from IPA. For the experiment, we obtained the required 32 channel raw electroencephalogram (EEG) data from three male subjects, and electrodes were placed on the scalp of the frontal lobe and both temporal lobes which are related to thinking and verbal function. Eigenvalues of the covariance matrix of the EEG data were used as the feature vector of each vowel. In the analysis, we provided the classification results of the back propagation artificial neural network (BP-ANN) for making a comparison with DBN. As a result, the classification results from the BP-ANN were 52.04%, and the DBN was 87.96%. This means the DBN showed 35.92% better classification results in multi class imagined speech classification. In addition, the DBN spent much less time in whole computation time. In conclusion, the DBN algorithm is efficient in BCI system implementation.Keywords: deep belief network, electroencephalogram, imagined speech, vowel recognition
- Published
- 2015
118. Editorial: Special Issue on Papers Selected in ISIS & SCIS 2003.
- Author
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Yong-Soo Kim and Kwee-Bo Sim
- Published
- 2004
- Full Text
- View/download PDF
119. Computational Model of a Mirror Neuron System for Intent Recognition through Imitative Learning of Objective-directed Action
- Author
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Kwang-Eun Ko and Kwee-Bo Sim
- Subjects
Matching (graph theory) ,business.industry ,Applied Mathematics ,media_common.quotation_subject ,Imitative learning ,Cognition ,Human–robot interaction ,Action (philosophy) ,Control and Systems Engineering ,Artificial intelligence ,Function (engineering) ,Psychology ,UVW mapping ,business ,Software ,Mirror neuron ,media_common - Abstract
The understanding of another’s behavior is a fundamental cognitive ability for primates including humans. Recent neuro-physiological studies suggested that there is a direct matching algorithm from visual observation onto an individual’s own motor repertories for interpreting cognitive ability. The mirror neurons are known as core regions and are handled as a functionality of intent recognition on the basis of imitative learning of an observed action which is acquired from visual-information of a goal-directed action. In this paper, we addressed previous works used to model the function and mechanisms of mirror neurons and proposed a computational model of a mirror neuron system which can be used in human-robot interaction environments. The major focus of the computation model is the reproduction of an individual’s motor repertory with different embodiments. The model’s aim is the design of a continuous process which combines sensory evidence, prior task knowledge and a goal-directed matching of action observation and execution. We also propose a biologically inspired plausible equation model. Keywords: mirror neuron system, imitative learning, human-robot interaction, intent recognitionI. 서론 - ! "#$%&'()*+. ,-10./ 0 1 234567489: 2000/ ; ?@ AB 1CDEFD )GH +I ; 1JKL MNO;P8QR+. STUM V
- Published
- 2014
120. EEG based Vowel Feature Extraction for Speech Recognition System using International Phonetic Alphabet
- Author
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Kwee-Bo Sim and Tae-Ju Lee
- Subjects
Support vector machine ,Computer science ,Vowel ,Feature vector ,Speech recognition ,International Phonetic Alphabet ,Feature extraction ,Speech corpus ,Neurocomputational speech processing ,Speech processing - Abstract
The researchs using brain-computer interface, the new interface system which connect human to macine, have been maded to implement the user-assistance devices for control of wheelchairs or input the characters. In recent researches, there are several trials to implement the speech recognitions system based on the brain wave and attempt to silent communication. In this paper, we studied how to extract features of vowel based on international phonetic alphabet (IPA), as a foundation step for implementing of speech recognition system based on electroencephalogram (EEG). We conducted the 2 step experiments with three healthy male subjects, and first step was speaking imagery with single vowel and second step was imagery with successive two vowels. We selected 32 channels, which include frontal lobe related to thinking and temporal lobe related to speech function, among acquired 64 channels. Eigen value of the signal was used for feature vector and support vector machine (SVM) was used for classification. As a result of first step, we should use over than 10th order of feature vector to analyze the EEG signal of speech and if we used 11th order feature vector, the highest average classification rate was 95.63 % in classification between /a/ and /o/, the lowest average classification rate was 86.85 % with /a/ and /u/. In the second step of the experiments, we studied the difference of speech imaginary signals between single and successive two vowels.
- Published
- 2014
121. Analysis the effect of PCA for feature reduction in non-stationary EEG based motor imagery of BCI system
- Author
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Xinyang Yu, Kwee-Bo Sim, and Pharino Chum
- Subjects
education.field_of_study ,business.industry ,Computer science ,Population ,Feature extraction ,Pattern recognition ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Support vector machine ,Motor imagery ,Principal component analysis ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,education ,Laplace operator ,Classifier (UML) ,Brain–computer interface - Abstract
Many brain computer–interface (BCI) systems depend on imagined movement to control external devices. But how to extract the imagination feature and classify them to control systems is an important problem. To simplify the complexity of the classification, the power band and a small number of electrodes have been used, but there is still a loss in classification accuracy in the state-of-art approaches. The critical problem is the machine learning art that when the signal into source has property of non-stationary causing the estimation of the population parameter to change over time. In this paper, we analyzed the performance of feature extraction method using several spatial filter such as common average reference (CAR), Laplacian (LAP), common spatial pattern analysis (CSP) and no-spatial filter techniques and feature reduction method using principle component analysis (PCA) based 90% rule variance and leave-one-out correct classification accuracy selection method; where support vector machine is the classifier. The simulation with non-stationary data set from BCI competition III-Iva shows that CAR best performance CSP method in non-stationary data and PCA with leave-one-out CCA could maintain CCA performance and reduced the trading off between training and testing 13.96% compared to not using PCA and 0.46% compared PCA with 90% variance.
- Published
- 2014
122. Parallel Model Feature Extraction to Improve Performance of a BCI System
- Author
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Seung-min Park, Kwee-Bo Sim, and Pharino Chum
- Subjects
Training set ,Computer science ,business.industry ,Applied Mathematics ,Feature extraction ,Pattern recognition ,Perceptron ,Machine learning ,computer.software_genre ,LTI system theory ,Discriminant ,Control and Systems Engineering ,Artificial intelligence ,business ,Classifier (UML) ,computer ,Software ,Brain–computer interface ,Test data - Abstract
It is well knowns that based on the CSP (Common Spatial Pattern) algorithm, the linear projection of an EEG (Electroencephalography) signal can be made to spaces that optimize the discriminant between two patterns. Sharing disadvantages from linear time invariant systems, CSP suffers from the non-stationary nature of EEGs causing the performance of the classification in a BCI (Brain-Computer Interface) system to drop significantly when comparing the training data and test data. The author has suggested a simple idea based on the parallel model of CSP filters to improve the performance of BCI systems. The model was tested with a simple CSP algorithm (without any elaborate regularizing methods) and a perceptron learning algorithm as a classifier to determine the improvement of the system. The simulation showed that the parallel model could improve classification performance by over 10% compared to conventional CSP methods.
- Published
- 2013
123. Implementation of Unsupervised Nonlinear Classifier with Binary Harmony Search Algorithm
- Author
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Kwee-Bo Sim, Tae-Ju Lee, Kwang-Eun Ko, Won-Ki Sung, and Seung-min Park
- Subjects
Nonlinear classifier ,Computer science ,business.industry ,Harmony search ,Binary number ,Pattern recognition ,Artificial intelligence ,Machine learning ,computer.software_genre ,business ,computer - Published
- 2013
124. Brain Wave Characteristic Analysis by Multi-stimuli with EEG Channel Grouping based on Binary Harmony Search
- Author
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Seung-min Park, Tae-Ju Lee, and Kwee-Bo Sim
- Subjects
Correlation coefficient ,medicine.diagnostic_test ,Computer science ,business.industry ,Applied Mathematics ,Speech recognition ,Binary number ,Pattern recognition ,Stimulus (physiology) ,Electroencephalography ,Control and Systems Engineering ,medicine ,Harmony search ,Artificial intelligence ,business ,Image resolution ,Software ,Brain–computer interface ,Communication channel - Abstract
This paper proposed a novel method for an analysis feature of an Electroencephalogram (EEG) at all channels simultaneously. In a BCI (Brain-Computer Interface) system, EEGs are used to control a machine or computer. The EEG signals were weak to noise and had low spatial resolution because they were acquired by a non-invasive method involving, attaching electrodes along with scalp. This made it difficult to analyze the whole channel of EEG signals. And the previous method could not analyze multiple stimuli, the result being that the BCI system could not react to multiple orders. The method proposed in this paper made it possible analyze multiple-stimuli by grouping the channels. We searched the groups making the largest correlation coefficient summation of every member of the group with a BHS (Binary Harmony Search) algorithm. Then we assumed the EEG signal could be written in linear summation of groups using concentration parameters. In order to verify this assumption, we performed a simulation of three subjects, 60 times per person. From the simulation, we could obtain the groups of EEG signals. We also established the types of stimulus from the concentration coefficient. Consequently, we concluded that the signal could be divided into several groups. Furthermore, we could analyze the EEG in a new way with concentration coefficients from the EEG channel grouping.
- Published
- 2013
125. Half-Against-Half Multi-class SVM Classify Physiological Response-based Emotion Recognition
- Author
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Kwee-Bo Sim, Kwang-Eun Ko, Makara Vanny, and Seung-Min Park
- Subjects
Visual perception ,business.industry ,Emotion classification ,Pattern recognition ,Blood volume pulse ,Machine learning ,computer.software_genre ,Class (biology) ,Disgust ,Support vector machine ,Kernel (statistics) ,Emotion recognition ,Artificial intelligence ,Psychology ,business ,computer - Abstract
The recognition of human emotional state is one of the most important components for efficient human-human and human-computer interaction. In this paper, four emotions such as fear, disgust, joy, and neutral was a main problem of classifying emotion recognition and an approach of visual-stimuli for eliciting emotion based on physiological signals of skin conductance (SC), skin temperature (SKT), and blood volume pulse (BVP) was used to design the experiment. In order to reach the goal of solving this problem, half-against-half (HAH) multi-class support vector machine (SVM) with Gaussian radial basis function (RBF) kernel was proposed showing the effective techniques to improve the accuracy rate of emotion classification. The experimental results proved that the proposed was an efficient method for solving the emotion recognition problems with the accuracy rate of 90% of neutral, 86.67% of joy, 85% of disgust, and 80% of fear.
- Published
- 2013
126. Optimal EEG Channel Selection by Genetic Algorithm and Binary PSO based on a Support Vector Machine
- Author
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Kwee-Bo Sim, Seung-min Park, Kwang-Eun Ko, and Jun-Yeup Kim
- Subjects
Meta-optimization ,Structured support vector machine ,Computer science ,business.industry ,Applied Mathematics ,Population-based incremental learning ,Pattern recognition ,Overfitting ,Support vector machine ,Relevance vector machine ,Control and Systems Engineering ,Genetic algorithm ,Artificial intelligence ,business ,Software ,Communication channel - Abstract
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.Keywords: brain-computer interface, binary particle swarm optimization, genetic algorithm, support vector machine
- Published
- 2013
127. Harmony search-based hidden Markov model optimization for online classification of single trial eegs during motor imagery tasks
- Author
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Kwee-Bo Sim and Kwang-Eun Ko
- Subjects
Computer science ,business.industry ,Robotics ,Pattern recognition ,Mechatronics ,Machine learning ,computer.software_genre ,Computer Science Applications ,ComputingMethodologies_PATTERNRECOGNITION ,Motor imagery ,Computer Science::Sound ,Control and Systems Engineering ,Harmony search ,Artificial intelligence ,Adaptive learning ,Hidden Markov model ,business ,computer ,Classifier (UML) ,Brain–computer interface - Abstract
This paper presents an improved method based on single trial EEG data for the online classification of motor imagery tasks for brain-computer interface (BCI) applications. The ultimate goal of this research is the development of a novel classification method that can be used to control an interactive robot agent platform via a BCI system. The proposed classification process is an adaptive learning method based on an optimization process of the hidden Markov model (HMM), which is, in turn, based on meta-heuristic algorithms. We utilize an optimized strategy for the HMM in the training phase of time-series EEG data during motor imagery-related mental tasks. However, this process raises important issues of model interpretation and complexity control. With these issues in mind, we explore the possibility of using a harmony search algorithm that is flexible and thus allows the elimination of tedious parameter assignment efforts to optimize the HMM parameter configuration. In this paper, we illustrate a sequential data analysis simulation, and we evaluate the optimized HMM. The performance results of the proposed BCI experiment show that the optimized HMM classifier is more capable of classifying EEG datasets than ordinary HMM during motor imagery tasks.
- Published
- 2013
128. A Study on Emotion Recognition Systems based on the Probabilistic Relational Model Between Facial Expressions and Physiological Responses
- Author
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Kwee-Bo Sim and Kwang-Eun Ko
- Subjects
Facial expression ,business.industry ,Applied Mathematics ,SIGNAL (programming language) ,Probabilistic logic ,Bayesian network ,Pattern recognition ,Machine learning ,computer.software_genre ,Domain (software engineering) ,Control and Systems Engineering ,Natural (music) ,Emotion recognition ,Artificial intelligence ,Psychology ,Set (psychology) ,business ,computer ,Software - Abstract
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.
- Published
- 2013
129. Binary Classification Method using Invariant CSP for Hand Movements Analysis in EEG-based BCI System
- Author
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Kwang-Eun Ko, Thanh Ha Nguyen, Seung-min Park, and Kwee-Bo Sim
- Subjects
Left and right ,medicine.diagnostic_test ,Computer science ,business.industry ,Speech recognition ,Pattern recognition ,Electroencephalography ,Independent component analysis ,Hand movements ,Binary classification ,Auditory stimuli ,medicine ,Artificial intelligence ,Invariant (mathematics) ,business ,Brain–computer interface - Abstract
In this study, we proposed a method for electroencephalogram (EEG) classification using invariant CSP at special channels for improving the accuracy of classification. Based on the naive EEG signals from left and right hand movement experiment, the noises of contaminated data set should be eliminate and the proposed method can deal with the de-noising of data set. The considering data set are collected from the special channels for right and left hand movements around the motor cortex area. The proposed method is based on the fit of the adjusted parameter to decline the affect of invariant parts in raw signals and can increase the classification accuracy. We have run the simulation for hundreds time for each parameter and get averaged value to get the last result for comparison. The experimental results show the accuracy is improved more than the original method, the highest result reach to 89.74%.
- Published
- 2013
130. EEG Analysis Following Change in Hand Grip Force Level for BCI Based Robot Arm Force Control
- Author
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Kwee-Bo Sim, Kwang-Eun Ko, Tae-Ju Lee, Seung-min Park, and Dong-Eun Kim
- Subjects
Artifact (error) ,medicine.diagnostic_test ,business.industry ,Fast Fourier transform ,Spectral density ,Electroencephalography ,Linear discriminant analysis ,Signal ,body regions ,medicine ,Computer vision ,Artificial intelligence ,business ,Robotic arm ,Mathematics ,Brain–computer interface - Abstract
With Brain Computer Interface (BCI) system, a person with disabled limb could use this direct brain signal like electro- encephalography (EEG) to control a device such as the artifact arm. The precise force control for the artifact arm is neces- sary for this artificial limb system. To understand the relationship between control EEG signal and the gripping force of hands, We proposed a study by measuring EEG changes of three grades (25%, 50%, 75%) of hand grip MVC (Maximal Voluntary Contract). The acquired EEG signal was filtered to obtain power of three wave bands (alpha, beta, gamma) by using fast fourier transformation (FFT) and computed power spectrum. Then the power spectrum of three bands (alpha, beta and gamma) of three classes (MVC 25%, 50%, 75%) was classified by using PCA (Principal Component Analysis) and LDA (Linear Discriminant Analysis). The result showed that the power spectrum of EEG is increased at MVC 75% more than MVC 25%, and the correct classification rate was 52.03% for left hand and 77.7% for right hand.
- Published
- 2013
131. Physiological Responses-Based Emotion Recognition Using Multi-Class SVM with RBF Kernel
- Author
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Kwang-Eun Ko, Seung-min Park, Kwee-Bo Sim, and Makara Vanny
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business.industry ,Applied Mathematics ,Speech recognition ,Gaussian ,Feature extraction ,Pattern recognition ,Support vector machine ,symbols.namesake ,Data acquisition ,Control and Systems Engineering ,Kernel (statistics) ,Radial basis function kernel ,symbols ,Radial basis function ,Artificial intelligence ,business ,Psychology ,Software ,International Affective Picture System - Abstract
Emotion Recognition is one of the important part to develop in human-human and human computer interaction. In this paper, we have focused on the performance of multi-class SVM (Support Vector Machine) with Gaussian RFB (Radial Basis function) kernel, which has been used to solve the problem of emotion recognition from physiological signals and to improve the accuracy of emotion recognition. The experimental paradigm for data acquisition, visual-stimuli of IAPS (International Affective Picture System) are used to induce emotional states, such as fear, disgust, joy, and neutral for each subject. The raw signals of acquisited data are splitted in the trial from each session to pre-process the data. The mean value and standard deviation are employed to extract the data for feature extraction and preparing in the next step of classification. The experimental results are proving that the proposed approach of multi-class SVM with Gaussian RBF kernel with OVO (One-Versus-One) method provided the successful performance, accuracies of classification, which has been performed over these four emotions.
- Published
- 2013
132. Real-Time Heart Rate Monitoring System based on Ring-Type Pulse Oximeter Sensor
- Author
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In-Hun Jang, Jun-Yeup Kim, Kwee-Bo Sim, Seung-min Park, and Kwang-Eun Ko
- Subjects
Stack (abstract data type) ,Pulse (signal processing) ,Computer science ,Heart rate monitoring ,Fast Fourier transform ,Real-time computing ,Heart rate ,Electronic engineering ,Ring type ,Heart rate variability ,Photoelectric plethysmography ,Electrical and Electronic Engineering - Abstract
With the continuous aging of the populations in developed countries, the medical requirements of the aged are expected to increase. In this paper, a ring-type pulse oximeter finger sensor and a 24-hour ambulatory heart rate monitoring system for the aged are presented. We also demonstrate the feasibility of extracting accurate heart rate variability measurements from photoelectric plethysmography signals gathered using a ring-type pulse oximeter sensor attached to the finger. We designed the heart rate sensor using a CPU with built-in ZigBee stack for simplicity and low power consumption. We also analyzed the various distorted signals caused by motion artifacts using a FFT, and designed an algorithm using a least squares estimator to calibrate the signals for better accuracy.
- Published
- 2013
133. Effects of Intentional Suppression of Recall of Unwanted Images in Repressors and Nonrepressors
- Author
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Deok-Yong Kim, Seok Hyeon Kim, Jang-Han Lee, Dong Hoon Oh, and Kwee-Bo Sim
- Subjects
Social Psychology ,Recall ,Motorbike accident ,Skin conductance ,Psychology ,Cognitive psychology ,Developmental psychology - Abstract
We investigated the ability to suppress recall of visual images, using the think/no-think (TNT) paradigm. Participants were 27 male undergraduates (13 repressors, 14 nonrepressors) who watched video clips of a motorbike accident as we recorded their galvanic skin response (GSR). We then conducted the TNT paradigm using motorbike accident images. Both repressors and nonrepressors recorded higher GSR when watching the video clips than at baseline. Both groups showed greater suppression of imaginary memories in the no-think condition than they did in either the think or the baseline conditions. We found repeated attempts at no-think might be an effective strategy for suppressing imaginary memories and that there were no differences in the ability of repressors and nonrepressors to suppress memory in the imaginary memory condition.
- Published
- 2013
134. Electroencephalography Signal Grouping and Feature Classification Using Harmony Search for BCI
- Author
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Seung-min Park, Kwee-Bo Sim, and Tae-Ju Lee
- Subjects
Article Subject ,medicine.diagnostic_test ,Eeg analysis ,Computer science ,business.industry ,lcsh:Mathematics ,Applied Mathematics ,Pattern recognition ,Electroencephalography ,lcsh:QA1-939 ,Machine learning ,computer.software_genre ,HS algorithm ,ComputingMethodologies_PATTERNRECOGNITION ,medicine ,Classification methods ,Harmony search ,Artificial intelligence ,business ,computer ,Classifier (UML) ,Brain–computer interface ,Eeg signal analysis - Abstract
This paper presents a heuristic method for electroencephalography (EEG) grouping and feature classification using harmony search (HS) for improving the accuracy of the brain-computer interface (BCI) system. EEG, a noninvasive BCI method, uses many electrodes on the scalp, and a large number of electrodes make the resulting analysis difficult. In addition, traditional EEG analysis cannot handle multiple stimuli. On the other hand, the classification method using the EEG signal has a low accuracy. To solve these problems, we use a heuristic approach to reduce the complexities in multichannel problems and classification. In this study, we build a group of stimuli using the HS algorithm. Then, the features from common spatial patterns are classified by the HS classifier. To confirm the proposed method, we perform experiments using 64-channel EEG equipment. The subjects are subjected to three kinds of stimuli: audio, visual, and motion. Each stimulus is applied alone or in combination with the others. The acquired signals are processed by the proposed method. The classification results in an accuracy of approximately 63%. We conclude that the heuristic approach using the HS algorithm on the BCI is beneficial for EEG signal analysis.
- Published
- 2013
135. Servo Controller For Electrostatic Micro-actuators.
- Author
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Hideki Hashimoto, Kwee-Bo Sim, Hiroyuki Fujita, and Fumio Harashima
- Published
- 1988
- Full Text
- View/download PDF
136. Optimal EEG Channel Selection using BPSO with Channel Impact Factor
- Author
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Jun-Yeup Kim, Seung-Min Park, Kwang-Eun Ko, and Kwee-Bo Sim
- Subjects
Imagination ,Computer science ,business.industry ,Interface (computing) ,media_common.quotation_subject ,Pattern recognition ,Overfitting ,computer.software_genre ,Support vector machine ,Motor imagery ,Data mining ,Artificial intelligence ,business ,computer ,Selection (genetic algorithm) ,Brain–computer interface ,media_common ,Communication channel - Abstract
Brain-computer interface based on motor imagery is a system that transforms a subject`s intention into a control signal by classifying EEG signals obtained from the imagination of movement of a subject`s limbs. For the new paradigm, we do not know which positions are activated or not. A simple approach is to use as many channels as possible. The problem is that using many channels causes other problems. When applying a common spatial pattern (CSP), which is an EEG extraction method, many channels cause an overfit problem, in addition there is difficulty using this technique for medical analysis. To overcome these problems, we suggest a binary particle swarm optimization with channel impact factor in order to select channels close to the most important channels as channel selection method. This paper examines whether or not channel impact factor can improve accuracy by Support Vector Machine(SVM).
- Published
- 2012
137. Orthonormal Polynomial based Optimal EEG Feature Extraction for Motor Imagery Brain-Computer Interface
- Author
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Seung-Min Park, Kwang-Eun Ko, Kwee-Bo Sim, and Pharino Chum
- Subjects
education.field_of_study ,business.industry ,Feature extraction ,Population ,Pattern recognition ,Feature selection ,Support vector machine ,Motor imagery ,Binary classification ,Feature (computer vision) ,Linear regression ,Artificial intelligence ,education ,business ,Mathematics - Abstract
In this paper, we explored the new method for extracting feature from the electroencephalography (EEG) signal based on linear regression technique with the orthonormal polynomial bases. At first, EEG signals from electrodes around motor cortex were selected and were filtered in both spatial and temporal filter using band pass filter for alpha and beta rhymic band which considered related to the synchronization and desynchonization of firing neurons population during motor imagery task. Signal from epoch length 1s were fitted into linear regression with Legendre polynomials bases and extract the linear regression weight as final features. We compared our feature to the state of art feature, power band feature in binary classification using support vector machine (SVM) with 5-fold cross validations for comparing the classification accuracy. The result showed that our proposed method improved the classification accuracy 5.44% in average of all subject over power band features in individual subject study and 84.5% of classification accuracy with forward feature selection improvement.
- Published
- 2012
138. Novel Intersection Type Recognition for Autonomous Vehicles Using a Multi-Layer Laser Scanner
- Author
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Kwee Bo Sim, Baehoon Choi, Euntai Kim, and Jhonghyun An
- Subjects
Occupancy grid mapping ,Laser scanning ,Computer science ,intersections ,local coordinate ,Type (model theory) ,multi-laser scanner ,occupancy grid map ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Article ,Analytical Chemistry ,Intersection ,0502 economics and business ,Computer vision ,lcsh:TP1-1185 ,Electrical and Electronic Engineering ,Instrumentation ,Multi layer ,050210 logistics & transportation ,static map ,business.industry ,010401 analytical chemistry ,05 social sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,recognition ,Artificial intelligence ,business ,Recursive Bayesian estimation - Abstract
There are several types of intersections such as merge-roads, diverge-roads, plus-shape intersections and two types of T-shape junctions in urban roads. When an autonomous vehicle encounters new intersections, it is crucial to recognize the types of intersections for safe navigation. In this paper, a novel intersection type recognition method is proposed for an autonomous vehicle using a multi-layer laser scanner. The proposed method consists of two steps: (1) static local coordinate occupancy grid map (SLOGM) building and (2) intersection classification. In the first step, the SLOGM is built relative to the local coordinate using the dynamic binary Bayes filter. In the second step, the SLOGM is used as an attribute for the classification. The proposed method is applied to a real-world environment and its validity is demonstrated through experimentation.
- Published
- 2016
139. ERS Feature Extraction using STFT and PSO for Customized BCI System
- Author
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Yong-Hoon Kim, Jun-Yeup Kim, Seung-Min Park, Kwee-Bo Sim, and Kwang-Eun Ko
- Subjects
Motor imagery ,medicine.diagnostic_test ,Computer science ,Speech recognition ,Feature extraction ,medicine ,Short-time Fourier transform ,Feature selection ,Neurophysiology ,Electroencephalography ,Synchronization ,Brain–computer interface - Abstract
This paper presents a technology for manipulating external devices by Brain Computer Interface (BCI) system. Recently, BCI based rehabilitation and assistance system for disabled people, such as patient of Spinal Cord Injury (SCI), general paralysis, and so on, is attracting tremendous interest. Especially, electroencephalogram (EEG) signal is used to organize the BCI system by analyzing the signals, such as evoked potential. The general findings of neurophysiology support an availability of the EEG-based BCI system. We concentrate on the event-related synchronization of motor imagery EEG signal, which have an affinity with an intention for moving control of external device. To analyze the brain activity, short-time Fourier transform and particle swarm optimization are used to optimal feature selection from the preprocessed EEG signals. In our experiment, we can verify that the power spectral density correspond to range mu-rhythm(~12Hz) have maximum amplitude among the raw signals and most of particles are concentrated in the corresponding region. Result shows accuracy of subject left hand 40% and right hand 38%.
- Published
- 2012
140. Improved Feature Extraction of Hand Movement EEG Signals based on Independent Component Analysis and Spatial Filter
- Author
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Kwee-Bo Sim, Kwang-Eun Ko, Seung-Min Park, and Thanh Ha Nguyen
- Subjects
Spatial filter ,Computer science ,business.industry ,Feature extraction ,Context (language use) ,Linear discriminant analysis ,Independent component analysis ,Noise ,ComputingMethodologies_PATTERNRECOGNITION ,Filter (video) ,Computer vision ,Artificial intelligence ,business ,Brain–computer interface - Abstract
In brain computer interface (BCI) system, the most important part is classification of human thoughts in order to translate into commands. The more accuracy result in classification the system gets, the more effective BCI system is. To increase the quality of BCI system, we proposed to reduce noise and artifact from the recording data to analyzing data. We used auditory stimuli instead of visual ones to eliminate the eye movement, unwanted visual activation, gaze control. We applied independent component analysis (ICA) algorithm to purify the sources which constructed the raw signals. One of the most famous spatial filter in BCI context is common spatial patterns (CSP), which maximize one class while minimize the other by using covariance matrix. ICA and CSP also do the filter job, as a raw filter and refinement, which increase the classification result of linear discriminant analysis (LDA).
- Published
- 2012
141. Design of Communication System for Intelligent Multi Agent Robot System
- Author
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In-Hun Jang, Kwang-Eun Ko, Kwee-Bo Sim, Jun-Yeup Kim, and Seung-Min Park
- Subjects
Routing protocol ,Engineering ,Static routing ,Dynamic Source Routing ,Brooks–Iyengar algorithm ,business.industry ,Applied Mathematics ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Key distribution in wireless sensor networks ,Control and Systems Engineering ,Sensor node ,Mobile wireless sensor network ,business ,Wireless sensor network ,Software ,Computer network - Abstract
In the ad-hoc wireless network environment, that the fixed sensor nodes and the sensor nodes to move are mixed, as the number of the sensor nodes with mobility are getting more, the costs to recover and maintain the whole network will increase more and more. This paper proposed the CDSR (Cost based Dynamic Source Routing) algorithm being motivated from the typical DSR algorithm, that is one of the reactive routing protocol. The cost function is defined through measuring the cost which any sensor node pays to participate in the whole network for communication. It is also showed in this paper that the proposed routing algorithm will increase the efficiency and life of whole sensor network through a series of experiments.
- Published
- 2012
142. Development of Intelligent Green Fountain Culture System for Healthy Emotional Self-Concept
- Author
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Kwee-Bo Sim, Young-Hwan Lee, Jun-Yeup Kim, Seung-Min Park, and Kwang-Eun Ko
- Subjects
Limelight ,Engineering ,Architectural engineering ,business.industry ,Self-concept ,Programmable logic controller ,Space (commercial competition) ,law.invention ,Industrial PC ,law ,Control system ,The Internet ,Fountain ,business ,Telecommunications - Abstract
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.
- Published
- 2012
143. Hybrid Model-Based Classification of the Action for Brain-Computer Interfaces
- Author
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Seung-Min Park, Kwee-Bo Sim, and Junheong Park
- Subjects
Action (philosophy) ,Computer science ,Human–computer interaction ,Electrical and Electronic Engineering ,Hybrid model ,Atomic and Molecular Physics, and Optics ,Brain–computer interface - Published
- 2012
144. Swarm Control of Distributed Autonomous Robot System based on Artificial Immune System using PSO
- Author
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Jun-Yeup Kim, Seung-Min Park, Kwang-Eun Ko, and Kwee-Bo Sim
- Subjects
Engineering ,Artificial immune system ,business.industry ,Applied Mathematics ,Swarm robotics ,Swarm behaviour ,Particle swarm optimization ,Autonomous robot ,Control and Systems Engineering ,Robot ,Artificial intelligence ,Multi-swarm optimization ,business ,Behavior-based robotics ,Software - Abstract
This paper proposes a distributed autonomous control method of swarm robot behavior strategy based on artificial immune system and an optimization strategy for artificial immune system. The behavior strategies of swarm robot in the system are depend on the task distribution in environment and we have to consider the dynamics of the system environment. In this paper, the behavior strategies divided into dispersion and aggregation. For applying to artificial immune system, an individual of swarm is regarded as a B-cell, each task distribution in environment as an antigen, a behavior strategy as an antibody and control parameter as a T-cell respectively. The executing process of proposed method is as follows: When the environmental condition changes, the agent selects an appropriate behavior strategy. And its behavior strategy is stimulated and suppressed by other agent using communication. Finally much stimulated strategy is adopted as a swarm behavior strategy. In order to decide more accurately select the behavior strategy, the optimized parameter learning procedure that is represented by stimulus function of antigen to antibody in artificial immune system is required. In this paper, particle swarm optimization algorithm is applied to this learning procedure. The proposed method shows more adaptive and robustness results than the existing system at the viewpoint that the swarm robots learning and adaptation degree associated with the changing of tasks.
- Published
- 2012
145. HMM-based Intent Recognition System using 3D Image Reconstruction Data
- Author
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Kwee-Bo Sim, Jun-Yeup Kim, Seung-Min Park, and Kwang-Enu Ko
- Subjects
business.industry ,Computer science ,Feature vector ,Feature extraction ,Optical flow ,Imitative learning ,Pattern recognition ,Kalman filter ,Gesture recognition ,Computer vision ,Artificial intelligence ,business ,Hidden Markov model ,Stereo camera - Abstract
The mirror neuron system in the cerebrum, which are handled by visual information-based imitative learning. When we observe the observer`s range of mirror neuron system, we can assume intention of performance through progress of neural activation as specific range, in include of partially hidden range. It is goal of our paper that imitative learning is applied to 3D vision-based intelligent system. We have experiment as stereo camera-based restoration about acquired 3D image our previous research Using Optical flow, unscented Kalman filter. At this point, 3D input image is sequential continuous image as including of partially hidden range. We used Hidden Markov Model to perform the intention recognition about performance as result of restoration-based hidden range. The dynamic inference function about sequential input data have compatible properties such as hand gesture recognition include of hidden range. In this paper, for proposed intention recognition, we already had a simulation about object outline and feature extraction in the previous research, we generated temporal continuous feature vector about feature extraction and when we apply to Hidden Markov Model, make a result of simulation about hand gesture classification according to intention pattern. We got the result of hand gesture classification as value of posterior probability, and proved the accuracy outstandingness through the result.
- Published
- 2012
146. Occluded Object Motion Estimation System based on Particle Filter with 3D Reconstruction
- Author
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Jun-Yeup Kim, Seung-Min Park, Junheong Park, Kwang-Eun Ko, and Kwee-Bo Sim
- Subjects
Logic ,business.industry ,Computer science ,3D reconstruction ,Optical flow ,Tracking system ,Tracing ,Object (computer science) ,Motion vector ,Computer Science Applications ,Computational Theory and Mathematics ,Artificial Intelligence ,Computer Science::Computer Vision and Pattern Recognition ,Motion estimation ,Signal Processing ,Computer vision ,Artificial intelligence ,business ,Particle filter - Abstract
This paper presents a method for occluded object based motion estimation and tracking system in dynamic image sequences using particle filter with 3D reconstruction. A unique characteristic of this study is its ability to cope with partial occlusion based continuous motion estimation using particle filter inspired from the mirror neuron system in human brain. To update a prior knowledge about the shape or motion of objects, firstly, fundamental 3D reconstruction based occlusion tracing method is applied and object landmarks are determined. And optical flow based motion vector is estimated from the movement of the landmarks. When arbitrary partial occlusions are occurred, the continuous motion of the hidden parts of object can be estimated by particle filter with optical flow. The resistance of the resulting estimation to partial occlusions enables the more accurate detection and handling of more severe occlusions.
- Published
- 2012
147. Development of Mirror Neuron System-based BCI System using Steady-State Visually Evoked Potentials
- Author
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Kwee-Bo Sim, Sang-Kyung Lee, Jun-Yeup Kim, Seung-Min Park, and Kwang-Enu Ko
- Subjects
Visual perception ,medicine.diagnostic_test ,Computer science ,business.industry ,Bandwidth (signal processing) ,Electroencephalography ,Linear discriminant analysis ,medicine ,Computer vision ,Artificial intelligence ,Occipital lobe ,Affordance ,business ,Mirror neuron ,Brain–computer interface - Abstract
Steady-State Visually Evoked Potentials (SSVEP) are natural response signal associated with the visual stimuli with specific frequency. By using SSVEP, occipital lobe region is electrically activated as frequency form equivalent to stimuli frequency with bandwidth from 3.5Hz to 75Hz. In this paper, we propose an experimental paradigm for analyzing EEGs based on the properties of SSVEP. At first, an experiment is performed to extract frequency feature of EEGs that is measured from the image-based visual stimuli associated with specific objective with affordance and object-related affordance is measured by using mirror neuron system based on the frequency feature. And then, linear discriminant analysis (LDA) method is applied to perform the online classification of the objective pattern associated with the EEG-based affordance data. By using the SSVEP measurement experiment, we propose a Brain-Computer Interface (BCI) system for recognizing user`s inherent intentions. The existing SSVEP application system, such as speller, is able to classify the EEG pattern based on grid image patterns and their variations. However, our proposed SSVEP-based BCI system performs object pattern classification based on the matters with a variety of shapes in input images and has higher generality than existing system.
- Published
- 2012
148. Training HMM Structure and Parameters with Genetic Algorithm and Harmony Search Algorithm
- Author
-
Kwee-Bo Sim, Seung-Min Park, Junheong Park, and Kwang-Eun Ko
- Subjects
Structure (mathematical logic) ,Computer science ,business.industry ,Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing) ,Pattern recognition ,HS algorithm ,Set (abstract data type) ,Electric power system ,ComputingMethodologies_PATTERNRECOGNITION ,Genetic algorithm ,Harmony search ,Transient (computer programming) ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Hidden Markov model - Abstract
In this paper, we utilize training strategy of hidden Markov model (HMM) to use in versatile issues such as classification of time-series sequential data such as electric transient disturbance problem in power system. For this, an automatic means of optimizing HMMs would be highly desirable, but it raises important issues: model interpretation and complexity control. With this in mind, we explore the possibility of using genetic algorithm (GA) and harmony search (HS) algorithm for optimizing the HMM. GA is flexible to allow incorporating other methods, such as Baum-Welch, within their cycle. Furthermore, operators that alter the structure of HMMs can be designed to simple structures. HS algorithm with parameter-setting free technique is proper for optimizing the parameters of HMM. HS algorithm is flexible so as to allow the elimination of requiring tedious parameter assigning efforts. In this paper, a sequential data analysis simulation is illustrated, and the optimized-HMMs are evaluated. The optimized HMM was capable of classifying a sequential data set for testing compared with the normal HMM.
- Published
- 2012
149. Optimal EEG Feature Extraction using DWT for Classification of Imagination of Hands Movement
- Author
-
Kwang-Eun Ko, Pharino Chum, Kwee-Bo Sim, and Seung-Min Park
- Subjects
Discrete wavelet transform ,medicine.diagnostic_test ,Computer science ,business.industry ,Feature extraction ,Feature selection ,Pattern recognition ,Electroencephalography ,Support vector machine ,Data set ,Feature (computer vision) ,medicine ,Artificial intelligence ,business ,Brain–computer interface - Abstract
An optimal feature selection and extraction procedure is an important task that significantly affects the success of brain activity analysis in brain-computer interface (BCI) research area. In this paper, a novel method for extracting the optimal feature from electroencephalogram (EEG) signal is proposed. At first, a student’s-t-statistic method is used to normalize and to minimize statistical error between EEG measurements. And, 2D time-frequency data set from the raw EEG signal was extracted using discrete wavelet transform (DWT) as a raw feature, standard deviations and mean of 2D time-frequency matrix were extracted as a optimal EEG feature vector along with other basis feature of sub-band signals. In the experiment, data set 1 of BCI competition IV are used and classification using SVM to prove strength of our new method.
- Published
- 2011
150. A Study on Swarm Robot-Based Invader-Enclosing Technique on Multiple Distributed Object Environments
- Author
-
Kwee-Bo Sim, Seung-Min Park, Kwang-Eun Ko, and Junheong Park
- Subjects
Engineering ,business.industry ,Real-time computing ,Swarm robotics ,Swarm behaviour ,Distributed object ,Object (computer science) ,Video tracking ,Pattern recognition (psychology) ,Robot ,Computer vision ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Particle filter - Abstract
Interest about social security has recently increased in favor of safety for infrastructure. In addition, advances in computer vision and pattern recognition research are leading to video-based surveillance systems with improved scene analysis capabilities. However, such video surveillance systems, which are controlled by human operators, cannot actively cope with dynamic and anomalous events, such as having an invader in the corporate, commercial, or public sectors. For this reason, intelligent surveillance systems are increasingly needed to provide active social security services. In this study, we propose a core technique for intelligent surveillance system that is based on swarm robot technology. We present techniques for invader enclosing using swarm robots based on multiple distributed object environment. The proposed methods are composed of three main stages: location estimation of the object, specified object tracking, and decision of the cooperative behavior of the swarm robots. By using particle filter, object tracking and location estimation procedures are performed and a specified enclosing point for the swarm robots is located on the interactive positions in their coordinate system. Furthermore, the cooperative behaviors of the swarm robots are determined via the result of path navigation based on the combination of potential field and wall-following methods. The results of each stage are combined into the swarm robot-based invader-enclosing technique on multiple distributed object environments. Finally, several simulation results are provided to further discuss and verify the accuracy and effectiveness of the proposed techniques.
- Published
- 2011
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