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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Institute of Electronics and Information Engineers
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The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 51, Issue 12 - Dec 2014
Volume 51, Issue 11 - Nov 2014
Volume 51, Issue 10 - Oct 2014
Volume 51, Issue 9 - Sep 2014
Volume 51, Issue 8 - Aug 2014
Volume 51, Issue 7 - Jul 2014
Volume 51, Issue 6 - Jun 2014
Volume 51, Issue 5 - May 2014
Volume 51, Issue 4 - Apr 2014
Volume 51, Issue 3 - Mar 2014
Volume 51, Issue 2 - Feb 2014
Volume 51, Issue 1 - Jan 2014
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Energy Efficient Transmit and Receive Strategies
Oh, Changyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 3~9
DOI : 10.5573/ieie.2014.51.2.003
We propose energy efficient transmit and receive strategies for nomadic M2M devices. Recently, communication applications consume more and more battery. Hence, the efficient battery management is becoming increasingly important. Turbo code as a channel coding is being widely used in many communication areas. Accordingly, the efficient energy management in using turbo code is an important issue. In this paper, we optimize joint transmit and receive energy for M2M devices pair. We first model the transmit energy and receive energy. Then, we develop the energy efficient transmit and receive strategies.
A Study on The eigen-properties on Varied Structural 2-Dim. Waveguides by Krylov-Schur Iteration Method
Kim, Yeong Min ; Lim, Jong Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 10~14
DOI : 10.5573/ieie.2014.51.2.010
Krylov-Schur iteration method has been applied to the 2-Dim. waveguides of the varied geometrical structure. The eigen-equations for them have been constructed from FEM based on the tangential edge vectors of triangular elements. The eigen-values and their modes have been determined from the diagonal components of the Schur matrices and its transforming matrices. The eigen-pairs as the results have been revealed visually in the schematic representations.
Reflective Variable Optical Attenuator using Liquid Crystals
Lee, Yong-Min ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 15~18
DOI : 10.5573/ieie.2014.51.2.015
This work studies a variable optical attenuator using a reflective type liquid crystal cell for optical switches. The proposed architecture is capable of comprising a compact and low voltage driving variable optical attenuator. The usefulness of the proposed architecture is demonstrated by showing characterization of the liquid crystal cell, temperature effects, and response characteristics of the architecture.
Design of Ku-band Low Phase Noise Oscillator Using DSRR Structure Resonator based on Metamaterial
Yoon, Nanae ; Seo, Chulhun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 19~22
DOI : 10.5573/ieie.2014.51.2.019
In this paper, Ku-band low phase noise oscillator using DSRR structure resonator based on metamaterial was proposed. To improve the phase noise of the oscillator, the proposed resonator consist of a DSRR strcuture based on metamaterial. The proposed resonator have a characteristic of
is -0.25 dB, and
in -44.59 dB at 14.67 GHz, respectively. At 14.67 GHz, the proposed Ku-band low phased oscillator achieves a output power of 2.03 dBm,
harmonic of -36.04 dBc, and phase noise of -130.63 dBc at the 100 kHz offset, respectively.
Highway Incident Detection and Classification Algorithms using Multi-Channel CCTV
Jang, Hyeok ; Hwang, Tae-Hyun ; Yang, Hun-Jun ; Jeong, Dong-Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 23~29
DOI : 10.5573/ieie.2014.51.2.023
The advanced traffic management system of intelligent transport systems automates the related traffic tasks such as vehicle speed, traffic volume and traffic incidents through the improved infrastructures like high definition cameras, high-performance radar sensors. For the safety of road users, especially, the automated incident detection and secondary accident prevention system is required. Normally, CCTV based image object detection and radar based object detection is used in this system. In this paper, we proposed the algorithm for real time highway incident detection system using multi surveillance cameras to mosaic video and track accurately the moving object that taken from different angles by background modeling. We confirmed through experiments that the video detection can supplement the short-range shaded area and the long-range detection limit of radar. In addition, the video detection has better classification features in daytime detection excluding the bad weather condition.
Improved Characteristics in AlGaN/GaN-on-Si HFETs Using Sacrificial GaO
Lee, Jae-Gil ; Cha, Ho-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 33~37
DOI : 10.5573/ieie.2014.51.2.033
We have developed a novel passivation process employing a sacrificial gallium oxide process in order to recover the surface damage in AlGaN/GaN HFETs. Even with a conventional prepassivation process, surface damage during high temperature ohmic annealing cannot be avoided completely. Therefore, it is necessary to recover the damaged surface to avoid the characteristic degradation. In this work, a sacrificial gallium oxide process has been proposed in which the damaged surface after ohmic annealing was oxidized by oxygen plasma treatment and thereafter etched back using HCl. As a result, the leakage current was dramatically reduced and thus the subthreshold slope was significantly improved. In addition, the maximum drain current level was increased from 594 to 634 mA/mm. To verify the effects, the surface conditions were carefully investigated using X-ray photoelectron spectroscopy.
Characterization Method of Memory Compiler Using Reference Memories
Shin, Woocheol ; Song, Hyekyoung ; Jung, Wonyoung ; Cho, Kyeongsoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 38~45
DOI : 10.5573/ieie.2014.51.2.038
This paper proposes a characterization method based on the reference memory to characterize memory compiler quickly and accurately. In order to maintain the accuracy of the memory complier and to minimize characterization time, the proposed method models the trends of the generated memories by selecting the reference memories after analyzing the timing trends of the memory compiler. To validate the proposed method, we characterized the 110nm memory compiler derived from 130nm memroy compiler. The average error rate of the characteristics of the memories generated by the proposed method and SPICE simulation is lower than
. Furthermore, we designed memory BIST test chips at 110nm and 180nm processes and the results of the function test show that the yield is 98.8% and 98.3%, respectively. Therefore, the proposed method is useful to characterize the memory compiler.
A Multiple Gain Controlled Digital Phase and Frequency Detector for Fast Lock-Time
Hong, Jong-Phil ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 46~52
DOI : 10.5573/ieie.2014.51.2.046
This paper presents a multiple gain controlled digital phase and frequency detector with a fast lock-time. Lock-time of the digital PLL can be significantly reduced by applying proposed adaptive gain control technique. A loop gain of the proposed digital PLL is controlled by three conditions that are very large phase difference between reference and feedback signal, small phase difference and before lock-state, and after lock-state. The simulation result shows that lock-time of the proposed multiple gain controlled digital PLL is 100 times faster than that of the conventional structure with unit gain mode.
Implementation of Constructor-Oriented Visualization System for Occluded Construction via Mobile Augmented-Reality
Kim, Tae-Ho ; Kim, Kyung-Ho ; Han, Yunsang ; Lee, Seok-Han ; Choi, Jong-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 55~68
DOI : 10.5573/ieie.2014.51.2.055
Some infrastructure these days is usually constructed under the ground for it to not interfere the foot-traffic of pedestrians, and thus, it is difficult to visually confirm the accurate location of the site where the establishments must be buried. These technical difficulties increase the magnitude of the problems that could arise from over-reliance on the experience of the worker or a mere blueprint. Such problems include exposure to flood and collapse. This paper proposes a constructor-oriented visualization system via mobile gadgets in general construction sites with occluded structures. This proposal is consisted with three stages. First, "Stage of detecting manhole and extracting features" detects and extracts the basis point of occluded structures which is unoccluded manhole. Next, "Stage of tracking features" tracks down the extracted features in the previous stage. Lastly, "Stage of visualizing occluded constructions" analyzes and synthesizes the GPS data and 3D objects obtained from mobile gadgets in the previous stages. This proposal implemented ideal method through parallel analysis of manhole detection, feature extraction, and tracking techniques in indoor environment, and confirmed the possibility through occluded water-pipe augmentation in real environment. Also, it offers a practical constructor-oriented environment derived from the augmented 3D results of occluded water-pipings.
People Counting System by Facial Age Group
Ko, Ginam ; Lee, YongSub ; Moon, Nammee ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 69~75
DOI : 10.5573/ieie.2014.51.2.069
Existing People Counting System using a single overhead mounted camera has limitation in object recognition and counting in various environments. Those limitations are attributable to overlapping, occlusion and external factors, such as over-sized belongings and dramatic light change. Thus, this paper proposes the new concept of People Counting System by Facial Age Group using two depth cameras, at overhead and frontal viewpoints, in order to improve object recognition accuracy and robust people counting to external factors. The proposed system is counting the pedestrians by five process such as overhead image processing, frontal image processing, identical object recognition, facial age group classification and in-coming/out-going counting. The proposed system developed by C++, OpenCV and Kinect SDK, and it target group of 40 people(10 people by each age group) was setup for People Counting and Facial Age Group classification performance evaluation. The experimental results indicated approximately 98% accuracy in People Counting and 74.23% accuracy in the Facial Age Group classification.
Parallel Design and Implementation of Shot Boundary Detection Algorithm
Lee, Joon-Goo ; Kim, SeungHyun ; You, Byoung-Moon ; Hwang, DooSung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 76~84
DOI : 10.5573/ieie.2014.51.2.076
As the number of high-density videos increase, parallel processing approaches are necessary to process a large-scale of video data. When a processing method of video data requires thousands of simple operations, GPU-based parallel processing is preferred to CPU-based parallel processing by way of reducing the time and space complexities of a given computation problem. This paper studies the parallel design and implementation of a shot-boundary detection algorithm. The proposed shot-boundary detection algorithm uses pixel brightness comparisons and global histogram data among the blocks of frames, and the computation of these data is characterized with the high parallelism for the related operations. In order to maximize these operations in parallel, the computations of the pixel brightness and histogram are designed in parallel and implemented in NVIDIA GPU. The GPU-based shot detection method is tested with 10 videos from the set of videos in National Archive of Korea. In experiments, the detection rate is similar but the computation time is about 10 time faster to that of the CPU-based algorithm.
Data Access Frequency based Data Replication Method using Erasure Codes in Cloud Storage System
Kim, Ju-Kyeong ; Kim, Deok-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 85~91
DOI : 10.5573/ieie.2014.51.2.085
Cloud storage system uses a distributed file system for storing and managing data. Traditional distributed file system makes a triplication of data in order to restore data loss in disk failure. However, enforcing data replication method increases storage utilization and causes extra I/O operations during replication process. In this paper, we propose a data replication method using erasure codes in cloud storage system to improve storage space efficiency and I/O performance. In particular, according to data access frequency, the proposed method can reduce the number of data replications but using erasure codes can keep the same data recovery performance. Experimental results show that proposed method improves performance in storage efficiency 40%, read throughput 11%, write throughput 10% better than HDFS does.
Using play-back image sequence to detect a vehicle cutting in a line automatically
Rheu, Jee-Hyung ; Kim, Young-Mo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 95~101
DOI : 10.5573/ieie.2014.51.2.095
This paper explains effective tracking method for a vehicle cutting in a line on the road automatically. The method employs KLT based on optical flow using play-back image sequence. Main contribution of this paper is play-back image sequence that is in order image frames for rewind direction from a reference point in time. The moment when recognizing camera can read a license plate very well can usually be the reference point in time. The biggest images of object traced can usually be obtained at this moment also. When optic flow is applied, the bigger image of the object traced can be obtained, the more feature points can be obtained. More many feature points bring good result of tracking object. After the recognizing cameras read a license plate on the vehicle suspected of cut-in-line violation, and then the system extracts the play-back image sequence from the tracking cameras for watching wide range. This paper compares using play-back image sequence as normal method for tracking to using play-forward image sequence as suggested method on the results of the experiment and also shows the suggested algorithm has a good performance that can be applied to the unmanned system for watching cut-in-line violation.
A Real-Time Hardware Architecture for Image Rectification Using Floating Point Processing
Han, Dongil ; Choi, Jeahoon ; Shin, Ho Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 102~113
DOI : 10.5573/ieie.2014.51.2.102
This paper suggests a novel hardware architecture of a real-time rectification which is to remove vertical parallax of an image occurred in the pre-processing stage of stereo matching. As an off-line step, Matlab Toolbox which was designed by J.Y Bouguet, was used to calculate calibration parameter of the image. Then, based on the Heikkila and Silven`s algorithm, rectification hardware was designed. At this point, to enhance the precision of the rectified image, floating-point unit was generated by using Xilinx Core Generator. And, we confirmed that proposed hardware design had higher precision compared to other designs while having the ability to do rectification in real-time.
Improved Image Restoration Algorithm about Vehicle Camera for Corresponding of Harsh Conditions
Jang, Young-Min ; Cho, Sang-Bock ; Lee, Jong-Hwa ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 114~123
DOI : 10.5573/ieie.2014.51.2.114
Vehicle Black Box (Event Data Recorder EDR) only recognizes the general surrounding environments of load. In addition, general EDR is difficult to recognize the images of a sudden illumination change. It appears that the lens is being a severe distortion. Therefore, general EDR does not provide the clues of the circumstances of the accident. To solve this problem, we estimate the value of Normalized Luminance Descriptor(NLD) and Normalized Contrast Descriptor(NCD). Illumination change is corrected using Normalized Image Quality(NIQ). Second, we are corrected lens distortion using model of Field Of View(FOV) based on designed method of fisheye lens. As a result, we propose integration algorithm of two methods that correct distortions of images using each Gamma Correction and Lens Correction in parallel.
Backlit Region Detection Using Adaptively Partitioned Block and Fuzzy C-means Clustering for Backlit Image Enhancement
Kim, Nahyun ; Lee, Seungwon ; Paik, Joonki ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 124~132
DOI : 10.5573/ieie.2014.51.2.124
In this paper, we present a novel backlit region detection and contrast enhancement method using fuzzy C-means clustering and adaptively partitioned block based contrast stretching. The proposed method separates an image into both dark backlit and bright background regions using adaptively partitioned blocks based on the optimal threshold value computed by fuzzy logic. The detected block-wise backlit region is refined using the guided filter for removing block artifacts. Contrast stretching algorithm is then applied to adaptively enhance the detected backlit region. Experimental results show that the proposed method can successfully detect the backlit region without a complicated segmentation algorithm and enhance the object information in the backlit region.
Picture Quality Compensation for PDP-TV in Shutter-Glass type 3D Image
Choi, Seog-Gweon ; Lee, In-Soo ; Kim, Kwang-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 133~140
DOI : 10.5573/ieie.2014.51.2.133
3D stereoscopic display is becoming increasingly common. Most stereoscopic displays still require the viewers to wear 3D glasses to watch 3D contents. As it is widely known, especially in shutter glass method, 3D glasses normally cause to reduce the perceived colorfulness and sharpness considerably as well as brightness. In this paper, we have estimated and analyzed the degradation of perceptual brightness in 3D images viewed through the shutter glasses by using CIECAM02 model. This study focuses on loss of colorfulness and sharpness when PDP-TV is watched at 3D mode in shutter-glass type 3D-TV. We analyze perceptual colorfulness and sharpness of 3D display with glasses and propose a method to compensate 3D colorfulness and sharpness for the best 3D experience.
Target Localization Using Underwater Objects in Multistatic Sonar
Lee, Kwanghee ; Seo, Ik-Su ; Han, Dong Seog ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 141~147
DOI : 10.5573/ieie.2014.51.2.141
This paper proposes a robust localization algorithm and optimal number of receivers considering the detection range of underwater targets. The accuracies of the source position, receiver position and sound velocity are improved using the known positions of underwater objects. The accuracies of these parameters influences the performance of the target localization error. Although the source and receiver positions are obtained by the global positioning system (GPS), there are still positional errors due to GPS and variations in sea temperature. First, the influence of those errors are analyzed mathematically and an algorithm is improved to improve the accuracies of source position, receiver position and sound velocity by using geographic points. The performance of the proposed scheme is evaluated in comparison with the conventional algorithm by computer simulations.
A Study on Classification of Waveforms Using Manifold Embedding Based on Commute Time
Hahn, Hee-Il ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 148~155
DOI : 10.5573/ieie.2014.51.2.148
In this paper a commute time embedding is implemented by organizing patches according to the graph-based metric, and its properties are investigated via changing the number of nodes on the graph.. It is shown that manifold embedding methods generate the intrinsic geometric structures when waveforms such as speech or music instrumental sound signals are embedded on the low dimensional Euclidean space. Basically manifold embedding algorithms only project the training samples on the graph into an embedding subspace but can not generalize the learning results to test samples. They are very effective for data clustering but are not appropriate for classification or recognition. In this paper a commute time guided transform is adopted to enhance the generalization ability and its performance is analyzed by applying it to the classification of 6 kinds of music instrumental sounds.
Determination of Noise Threshold from Signal Histogram in the Wavelet Domain
Kim, Eunseo ; Lee, Kamin ; Yang, Sejung ; Lee, Byung-Uk ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 156~160
DOI : 10.5573/ieie.2014.51.2.156
Thresholding in frequency domain is a simple and effective noise reduction technique. Determination of the threshold is critical to the image quality. The optimal threshold minimizing the Mean Square Error (MSE) is chosen adaptively in the wavelet domain; we utilize an equation of the MSE for the soft-thresholded signal and the histogram of wavelet coefficients of the original image and noisy image. The histogram of the original signal is estimated through the deconvolution assuming that the probability density functions (pdfs) of the original signal and the noise are statistically independent. The proposed method is quite general in that it does not assume any prior for the source pdf.
Load compensation and Speed Controller for Hydraulic Inverter-fed Elevator
Han, Sang-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 163~167
DOI : 10.5573/ieie.2014.51.2.163
To prove the vibration and speed error problems caused by the nonlinear friction characteristics and load variation of the hydraulic system, a PID speed controller and a load compensation controller for the hydraulic inverter-fed elevator are proposed. The load compensation controller is composed by the PI controller and the speed controller is composed by the PID controller. The P,I and D gains of the control parameters are obtained by the frequency response of system transfer function. The Effectiveness of the proposed controller are shown by experimental results, which the proposed controller yields robustness with load variations and stable and good speed and acceleration responses with less oscillations.
A New Driving Method Generating Self-Erasing Discharge to Improve Luminous Efficiency in AC PDP
Cho, Byung-Gwon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 168~172
DOI : 10.5573/ieie.2014.51.2.168
A new sustain driving method is proposed to improve luminous efficiency by the generation of the self-erasing discharge during a sustain period in AC plasma display panel. As one subfield time in the conventional AC PDP is divided into the reset, address, and sustain period. Among them, as the square sustain waveform is alternately applied to the X and Y electrodes on the front plate during the sustain period, the plasma discharge for displaying the image is continuously produced. Meanwhile, in the conventional driving method, the address waveform applied to the A electrode on the rear plate is only driving during an address period and grounded during a sustain period. In this experiment, the negative pulse is applied to the A electrode at the latter part of the sustain pulse for improving the luminous efficiency producing the self-erasing discharge during the sustain period. The negative pulse on the A electrode can change from the space to the wall charge and induce the additional discharge by the accumulated wall charge when the voltages of three electrodes are grounded. As a result, the luminous efficiency will be measured with changes in the voltage level of the A electrode and the new driving method can be improved to the luminous efficiency about 32 % compared with the conventional driving method.
Automatic Segmentation of Lung, Airway and Pulmonary Vessels using Morphology Information and Advanced Rolling Ball Algorithm
Cho, Joon-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 173~181
DOI : 10.5573/ieie.2014.51.2.173
In this paper, the algorithm that can automatically segment the lung, the airway and the pulmonary vessels in a chest CT was proposed. The proposed method is progressed in three steps. In the first step, the lung and the airway are segmented by the region growing law through the optimal threshold and three-dimensional labeling. In the second, from the start point to the first carina of the airway is segmented by the deduction operation, and the next airway of the bifurcations are segmented by applying a variable threshold technique. In the third step, the left/right lungs are divided by the restoration process for the lung, and the outside of lungs for abnormal is checked by applying the advanced rolling ball algorithm, and if abnormal is found, that part is removed, and it is restored to the normal lungs by connecting the outside of the lung in the form of second-order polynomial. Finally, pulmonary vessels are segmented by applying the three-dimensional connected component labeling method and three-dimensional region growing method. As the results of simulation, it could be confirmed that the pulmonary vascular is accurately divided without loss of tissue around lung.
A Framework of Recognition and Tracking for Underwater Objects based on Sonar Images : Part 1. Design and Recognition of Artificial Landmark considering Characteristics of Sonar Images
Lee, Yeongjun ; Lee, Jihong ; Choi, Hyun-Taek ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 182~189
DOI : 10.5573/ieie.2014.51.2.182
This paper proposed a framework of recognition and tracking for underwater objects using sonar images as an alternative of underwater optical camera which has the limitation of usage due to turbidity. In Part 1, a design and recognition method for 2D artificial landmark was proposed considering the practical performance of current imaging sonars. In particular, its materials are selected in order to maximize detectability based on characteristics of imaging sonar and ultrasonic waves. It has a simple and omni-directional shape which allows an easy modeling of object, and it includes region based features as identifications. Also, we proposed a real-time recognition algorithm including edge detector, Hough circle transforms, and shape matrix based recognition algorithm. The proposed methods are verified by basin tests using DIDSON.
Design of Balancing Robot Controller using Optimal Control Method
Yeo, Hee-Joo ; Park, Hun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 190~196
DOI : 10.5573/ieie.2014.51.2.190
In this paper, we get state equations based on wheel`s rotation, tilt and steering are independent each other in balancing robot. Accordingly, we propose two LQR controllers which are appropriate for rotation and steering control of a balancing robot. And its superiority and appropriateness are demonstrated by a comparison to a PID method. Simulation results verify the possibility of upright balancing, rectilinear motion and position control. Moreover, experimental results show that it guarantees the performance to apply the two LQR controllers to balance the robot.
A Design of Message Oriented Management and Analysis Tool for Naval Combat Systems
Song, Kyoung-Sub ; Kim, Dong-Seong ; Choi, Yoon-Suk ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 197~204
DOI : 10.5573/ieie.2014.51.2.197
This paper investigates a design of optimization database structure layout of Message Oriented Analysis and Management Tool (MOMAT) for naval combat systems (NCS). The NCS is composed of heterogeneous and large-scale component such as communication service and data distribution servcies (DDS). Each components are massively made the data as components. To manage the messages, MOMAT is developed. Typical modeling tool have problems that low performance due to duplicate database tables. An efficient design that one of the database optimization is proposed to solve the problems in this paper. It reduces the number of tables and improves application response and processing time. Experiment results shows that an availability of proposed method in MOMAT and decrease of both amount of data from client node to server and sever load.
Modified median filter based on multi-step
Kim, Young-Ro ; Dong, Sung-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 207~213
DOI : 10.5573/ieie.2014.51.2.207
In this paper, we propose a modified median filter for impulse noise reduction. The proposed method based on multi-step finds noisy pixels from the corrupted image and applies filtering on the noisy pixels. Neighbor pixels for filtering are filtered by linear filter which adjusts filtering direction according to an edge. Thus, our proposed method not only preserves edge, but also reduces noise in uniform region. Experimental results show that our proposed method has better quality than those by existing modified median filtering method.
Development of the Educational Robot System Considering for Extension and Load Reduction
Lee, Seung-Heui ; Choi, Deuk-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 214~219
DOI : 10.5573/ieie.2014.51.2.214
In this paper, a new robot system is designed and manufactured to improve the educational robot. The main processor is realized using the ARM Cortex-M3 and the co-processor is implemented by AVR ATMega2560 to deal with data coming from sensor modules. The processor of sensor modules was developed by the AVR ATMega8. The communication system is composed with IIC communication to alleviate the load of main processor. We have developed the educational robot system adopting the hub module for extension characteristics.
Passive RFID system for Efficient Area Coverage Algorithm
Lee, Sangyup ; Lee, Choong-Yong ; Jo, Wonse ; Nam, Sang Yep ; Kim, Dong-Han ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 2, 2014, Pages 220~226
DOI : 10.5573/ieie.2014.51.2.220
This paper proposes an enhanced fast scanning method for multi-agent robot system. Passive RFID tag can read and store the information within the range of recognizable RF tag reader. Based on this information of Passive RFID tag, the position of mobile robot can be estimated and at the same time, the efficiency of scanning process can be improved because it provides a scanning trace for other mobile robots. This paper proposes an dfficient motion planning algorithm for mobile robots in a smart floor environment.