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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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A Study on Partial Correlation based PSS Detection Schemes for Initial Cell Search in LTE Systems
Joo, Jung Suk ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 3~10
DOI : 10.5573/ieie.2014.51.9.003
The synchronization signal in Long Term Evolution (LTE) systems contains the primary synchronization signal (PSS) and the secondary synchronization signal (SSS), and the overall synchronization performance is dominated by PSS detection. In this paper, we propose a PSS detection scheme employing three partial correlation based PSS detectors with different partial correlation lengths, in which calculated partial correlation values are reused in order to reduce computational complexity. A coherent selection scheme using tentative frequency offsets is also proposed to select one reliable result from outputs of partial correlation based PSS detectors. It is shown through computer simulation that the proposed scheme can have a robust detection performance in wide range of frequency offsets.
Mobility Management Method for Constrained Sensor Nodes in WoT Environment
Chun, Seung-Man ; Ge, Shu-Yuan ; Park, Jong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 11~20
DOI : 10.5573/ieie.2014.51.9.011
For Web-based applications in IoT environment, IETF CoRE WG has standardizing the CoAP. One of limitations of CoAP is that CoAP standard does not consider the mobility management of the CoAP sensor node. In this paper, we propose the mobility management protocol of CoAP sensor node by considering the characteristics of the constrained network. The proposed mobility management protocol supports for Web client to be transmitted the sensing data from CoAP node reliably while the CoAP sensor moves into different wireless networks. To do this, we designed the architecture with the separate IP address management of CoAP sensor node and presented the mobility management protocol, which includes the holding and binding mode, in order to provide the reliable transmission. Finally, the numerical analysis and simulation with NS2 tool have been done for the performance evaluation in terms of the handover latency and packet loss with comparing the proposed mobility management protocol with other the existing mobility management protocols. The performance result shows that the proposed mobility management can provide the transmission of sensing data without the packet loss comparing with the existing mobility management protocol reliably.
A Simple Toeplitz Channel Matrix Decomposition with Vectorization Technique for Large scaled MIMO System
Park, Ju Yong ; Hanif, Mohammad Abu ; Kim, Jeong Su ; Song, Sang Seob ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 21~29
DOI : 10.5573/ieie.2014.51.9.021
Due to enormous number of user and limited memory space, the memory saving is become an important issue for big data service these days. In the large scaled multiple-input multiple-output (MIMO) system, the Teoplitz channel can play the significance rule to improve the performance as well as power efficiency. In this paper, we propose a Toeplitz channel decomposition based on matrix vectorization. Here we use Toeplitz matrix to the channel for large scaled MIMO system. And we show that the Toeplitz Jacket matrices are decomposed to Cooley-Tukey sparse matrices like fast Fourier transform (FFT).
Inverse-Orthogonal Jacket-Haar and DCT Transform
Park, Ju Yong ; Khan, Md. Hashem Ali ; Kim, Jeong Su ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 30~40
DOI : 10.5573/ieie.2014.51.9.030
As the Hadamard transform can be generalized into the Jacket transform, in this paper, we generalize the Haar transform into the Jacket-Haar transform. The entries of the Jacket-Haar transform are 0 and
. Compared with the original Haar transform, the basis of the Jacket-Haar transform is general and more suitable for signal processing. As an application, we present the DCT-II(discrete cosine transform-II) based on
Hadamard matrix and HWT(Haar Wavelete transform) based on
Haar matrix, analysis the performances of them and estimate them via the Lenna image simulation.
High Gain and High Efficiency Class-E Power Amplifier Using Controlling Drain Bias for WPT
Kim, Sanghwan ; Seo, Chulhun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 41~45
DOI : 10.5573/ieie.2014.51.9.041
In this paper, a high-efficiency power amplifier is implemented by using a drain bias control circuit operated at low input power for WPT(Wireless Power Transfer). Adaptive bias control circuit was added to high-efficiency class-E amplifier. It was possible to obtain the overall improvement in efficiency by adjusting the drain bias at low input power. The proposed adaptive class-E amplifier is implemented by using the input and output matching network and serial resonant circuit for improvement in efficiency. Drain bias control circuit consists of a directional coupler, power detector, and operational amplifier for adjusting the drain bias according to the input power. The measured results show that output powers of 41.83 dBm were obtained at 13.56 MHz. At this frequency, we have obtained the power added efficiency(PAE) of 85.67 %. It was confirmed increase of PAE of an average of 8 % than the fixed bias from the low input power level of 0 dBm ~ 6 dBm.
Ku-Band RF Transceiver System Design for UAV Line-Of-Sight Datalink
Choi, Jaewon ; Kim, Jihoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 46~53
DOI : 10.5573/ieie.2014.51.9.046
In this paper, ku-band RF transceiver system is designed for the unmanned aerial vehicle(UAV) line-of-sight(LOS) datalink. The RF transceiver system is consisted of the transmitting and receiving unit, RF front-end unit, and high power amplification unit. The transmitting and receiving unit has the functions of frequency up/down converting and channel changing. The RF front-end unit has the functions of transmitting and receiving signal duplexing, antenna selection, small signal amplification, and frequency filtering excluding the receiving signal. The high power amplification unit has the functions of ku-band power amplification and transmitting power variation(High/Middle/Low/Mute). The frequency up/down converting of transmitting and receiving unit is designed by using the superheterodyne method. The RF transceiver system is designed to obtain the broadband and high linearity properties for the reliable transmission and reception of high data-rate and high speed data. Also, the channel changing function is designed to use selectively the frequency as the operation environment of UAV.
A Low-Complexity Real-Time Barrel Distortion Correction Processor Combined with Color Demosaicking
Jeong, Hui-Seong ; Park, Yun-Ju ; Kim, Tae-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 57~66
DOI : 10.5573/ieie.2014.51.9.057
This paper presents a low-complexity barrel distortion correction processor for wide-angle cameras. The proposed processor performs the barrel distortion correction jointly with the color demosaicking, so that the hardware complexity can be reduced significantly. In addition, to reduce the required memory bandwidth, an efficient memory interface is proposed by utilizing the spatial locality of the memory access in the correction process. The proposed processor is implemented with 35K logic gates in a
CMOS process and its correction speed is 150 Mpixels/s at the operating frequency of 606MHz, where the supported frame size is
and the required memory bandwidth is 1 read/cycle.
Design of Redundant Binary Adder based on Memristor-CMOS
Ahn, Yeongyu ; Lee, Sang-Jin ; Kim, Seokman ; Eshraghian, Kamran ; Cho, Kyoungrok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 67~74
DOI : 10.5573/ieie.2014.51.9.067
This paper presents a memristor-CMOS based RBSD adder. Conventional RBSD adders suffer bigger hardware due to the extra logic handling larger number of bits. The purpose of this paper is to improve the silicon surface area and the computation delay of conventional RBSD adders. The proposed method employs memristor-CMOS based circuit. The implementation results shows that the proposed memristor-CMOS based RBSD adder saves the cell area by 45%, and reduces time delay 24% compared to conventional RBSD adders. The proposed RBSD adder design can bring further area saving for large scale designs.
A Study of Integral Image Hardware Design for Memory Size Efficiency
Lee, Su-Hyun ; Jeong, Yong-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 75~81
DOI : 10.5573/ieie.2014.51.9.075
The integral image is the sum of input image pixel values. It is mainly used to speed up processing of a box filter operation, such as Haar-like features. However, large memory for integral image data can be an obstacle on an embedded hardware environment with limited memory resources. Therefore, an efficient method to store the integral image is necessary. In this paper, we propose a memory size reduction hardware design for integral image. The hardware design is used two methods. It is the new integral image memory and modulo calculation for reducing integral image data. The new integral image memory has additional calculation overhead, but it is not obstacle in hardware environment that parallel processing is possible. In the Xilinx Virtex5-LX330T targeted experimental result, integral image memory can be reduced by 50% on a
8-bit gray-scale input image.
Four-Channel Differential CMOS Optical Transimpedance Amplifier Arrays for Panoramic Scan LADAR Systems
Kim, Sang Gyun ; Jung, Seung Hwan ; Kim, Seung Hoon ; Ying, Xiao ; Choi, Hanbyul ; Hong, Chaerin ; Lee, Kyungmin ; Eo, Yun Seong ; Park, Sung Min ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 82~90
DOI : 10.5573/ieie.2014.51.9.082
In this paper, a couple of 4-channel differential transimpedance amplifier arrays are realized in a standard 0.18um CMOS technology for the applications of linear LADAR(laser detection and ranging) systems. Each array targets 1.25-Gb/s operations, where the current-mode chip consists of current-mirror input stage, a single-to-differential amplifier, and an output buffer. The input stage exploits the local feedback current-mirror configuration for low input resistance and low noise characteristics. Measurements demonstrate that each channel achieves
transimpedance gain, 2.2-GHz bandwidth, 21.5-pA/sqrt(Hz) average noise current spectral density (corresponding to the optical sensitivity of -20.5-dBm), and the 4-channel total power dissipation of 147.6-mW from a single 1.8-V supply. The measured eye-diagrams confirms wide and clear eye-openings for 1.25-Gb/s operations. Meanwhile, the voltage-mode chip consists of inverter input stage for low noise characteristics, a single-to-differential amplifier, and an output buffer. Test chips reveal that each channel achieves
transimpedance gain, 1.1-GHz bandwidth, 13.2-pA/sqrt(Hz) average noise current spectral density (corresponding to the optical sensitivity of -22.8-dBm), and the 4-channel total power dissipation of 138.4-mW from a single 1.8-V supply. The measured eye-diagrams confirms wide and clear eye-openings for 1.25-Gb/s operations.
Implementation of Location Tracking Sensor Network Using M2M Technology & Cloud Services
Kim, Kyung-Shin ; Kang, Moon-Sik ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 93~102
DOI : 10.5573/ieie.2014.51.9.093
Sensor networks are utilized in various fields as the useful system that provides the useful information to the user, by storing, processing and analyzing the various data collected from sensors. In construction of such sensor networks, by utilizing cloud PaaS for both communication server and the database server, the cost reduction and stabilization of the system can be achieved. In this paper, UDIPSN (User Decision Information Providing Sensor Network) was implemented to provide the decision information to the users by being treated as a cloud service for the location information of a moving object as well as various sensor data. Finally, we showed that the operation of the proposed system was performed properly.
Improving Hardware Resource Utilization for Software Load Balancer using Multiprocess in Virtual Machine
Kim, Minsu ; Kim, Seung Hun ; Lee, Sang-Min ; Ro, Won Woo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 103~108
DOI : 10.5573/ieie.2014.51.9.103
In the virtualized server systems, a scheduler in a hypervisor is responsible to assign physical resources for virtual machines. However, the traditional scheduler is hard to provide optimized resource allocation considering the amount of I/O requests. Especially, the drawback hinders performance of software load balancer which runs on virtual machines to distribute I/O requests from the clients. In this paper, we propose a new architecture to improve the performance of software load balancer using multiprocess. Our architecture aims to improve hardware resource utilization and overall performance of the server systems which utilize virtualization technology. Experimental results show the effectiveness of the proposed architecture for the various cases.
Efficient Markov Feature Extraction Method for Image Splicing Detection
Han, Jong-Goo ; Park, Tae-Hee ; Eom, Il-Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 111~118
DOI : 10.5573/ieie.2014.51.9.111
This paper presents an efficient Markov feature extraction method for detecting splicing forged images. The Markov states used in our method are composed of the difference between DCT coefficients in the adjacent blocks. Various first-order Markov state transition probabilities are extracted as features for splicing detection. In addition, we propose a feature reduction algorithm by analysing the distribution of the Markov probability. After training the extracted feature vectors using the SVM classifier, we determine whether the presence of the image splicing forgery. Experimental results verify that the proposed method shows good detection performance with a smaller number of features compared to existing methods.
Fast Human Detection Method in Range Data using Adaptive UV-histogram and Template Matching
Yoon, Bumsik ; Kim, Whoi-Yul ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 119~128
DOI : 10.5573/ieie.2014.51.9.119
In this paper, a fast human detection method using adaptive UV-histogram and template matching is proposed. The proposed method improves the detection rate in the scene of complex environment. The method firstly generates U-histogram to extract human candidates and adaptively generates V-histogram for each labled U-histogram, thus it could extract humans correctly, which was impossible in the previous method. The method tries to match the human candidates with the adaptively sized omega shape template to the focal length and distance in order to improve the detection accuracy. It also detects false positives by rematching the template with accumulated foreground images and hence is robust to the occlusion. Experimental results showed that the proposed method has superior performance to the Bae's method in the complex environment with about 15% improvement in precision and 80% in recall and has 20 times faster processing time than Xia's method.
Color Interpolation Algorithm for Pixel Resolution Modus of Image Sensor
Kim, Bu-Gong ; Kim, Moon-Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 129~138
DOI : 10.5573/ieie.2014.51.9.129
Various interpolations for digital imaging devices with a single image sensor have proposed. However, conventional methods did not consider the resolution modus of image sensor using periodic sampling. Therefore, the resulting images have problems such as quality degradation and color artifacts(color moire, zipper). In this paper, we propose a color interpolation algorithm for pixel resolution modus of image sensor. The proposed algorithm consisted of an initial step to compensate edge prediction effectively and refinement step using minimum directions for pixel resolution modus. To analyze a result of the proposed algorithm with conventional methods, we evaluated subjectively using images quality comparison and objectively using PSNR(Peak Signal to Noise Ratio). Experimental results showed that the proposed algorithm was more successful in eliminating the color artifacts than conventional methods judged by both objective and subjective criteria.
Multi-Object Detection and Tracking Using Dual-Layer Particle Sampling
Jeong, Kyungwon ; Kim, Nahyun ; Lee, Seoungwon ; Paik, Joonki ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 139~147
DOI : 10.5573/ieie.2014.51.9.139
In this paper, we present a novel method for simultaneous detection and tracking of multiple objects using dual-layer particle filtering. The proposed dual-layer particle sampling (DLPS) algorithm consists of parent-particles (PP) in the first layer for detecting multiple objects and child-particles (CP) in the second layer for tracking objects. In the first layer, PPs detect persons using a classifier trained by the intersection kernel support vector machine (IKSVM) at each particle under a randomly selected scale. If a certain PP detects a person, it generates CPs, and makes an object model in the detected object region for tracking the detected object. While PPs that have detected objects generate CPs for tracking, the rest of PPs still move for detecting objects. Experimental results show that the proposed method can automatically detect and track multiple objects, and efficiently reduce the processing time using the sampled particles based on motion distribution in video sequences.
Robust MVDR Adaptive Array by Efficient Subspace Tracking
Choi, Yang-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 148~156
DOI : 10.5573/ieie.2014.51.9.148
In the MVDR (minimum variance distortionless response) adaptive array, its performance could be greatly deteriorated in the presence of steering vector errors as the desired signal is treated as an interference. This paper suggests an computationally simple adaptive beamforming method which is robust against these errors. In the proposed method, a minimization problem that is formulated according to the DCB (doubly constrained beamforming) principle is solved to find a solution vector, which is in turn projected onto a subspace to obtain a new steering vector. The minimization problem and the subspace projection are dealt with using some principal eigenpairs, which are obtained using a modified PASTd(projection approximation subspace tracking with deflation). We improve the existing MPASTd(modified PASTd) algorithm such that the computational complexity is reduced. The proposed beamforming method can significantly reduce the complexity as compared with the conventional ones directly eigendecomposing an estimate of the corelation matrix to find all eigenvalues and eigenvectors. Moreover, the proposed method is shown, through simulation, to provide performance improvement over the conventional ones.
Analysis of Two Moving Platform Passive Emitter Location with Continuously Measurable Parameters
Park, Jin-Oh ; Lee, Moon Seok ; Park, Young-Mi ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 157~164
DOI : 10.5573/ieie.2014.51.9.157
The accuracy of instantaneous passive emitter localization varies with sensing platforms and measurable parameters. Appropriate combination of instantaneous measurable parameters have more accurate localization performance than a single parameter based localization in general. Emitter localization is preferred to use a small number of receivers as possible for the efficiency of strategic management in the field of modern electronic warfare support. For this reason, we compare CRLB (Cramer-Rao lower bound) of two moving platform with various measurable parameters to search a appropriate choice of parameters for the better localization performance through the x-y axis CEP (circular error probable) derived form CLRB. In addition, we present the relation of the localization performance and accuracy of measurable parameters.
Gain Compensation Method for Codebook-Based Speech Enhancement
Jung, Seungmo ; Kim, Moo Young ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 165~170
DOI : 10.5573/ieie.2014.51.9.165
Speech enhancement techniques that remove surrounding noise are stressed to preprocessor of speech recognition. Among the various speech enhancement techniques, Codebook-based Speech Enhancement (CBSE) operates efficiently in non-stationary noise environments. But, CBSE has some problems that inaccurate gains can be estimated if mismatch occur between input noisy signal and trained speech/noise codevectors. In this paper, the Normalized Weighting Factor (NWF) is calculated by long-term noise estimation algorithm based on Signal-to-Noise Ratio, compensated to the conventional inaccurate gains. The proposed CBSE shows better performance than conventional CBSE.
Model Matching for Input/Output Asynchronous Machines Using Output Equivalent Machines
Park, Yong Kuk ; Yang, Jung-Min ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 173~181
DOI : 10.5573/ieie.2014.51.9.173
This paper addresses the problem of model matching control for a class of systems modeled as input/output asynchronous sequential machines. Based on the feedback control scheme, we design a corrective controller that compensates the behavior of the closed-loop system so as to match a reference model. Whereas the former studies use state observers and the output burst for designing a controller, the present research needs neither the observer nor the output burst in controller design. We define the 'output equivalent machine' of the considered machine to describe the existence condition and the construction algorithm for the proposed controller. A case study is provided to show the operation of the proposed corrective controller.
Improving the Accuracy of the Tapped Delay Time-to-Digital Converter Using Field Programmable Gate Array
Jung, Do-Hwan ; Lim, Hansang ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 182~189
DOI : 10.5573/ieie.2014.51.9.182
A tapped delay line time-to-digital converter (TDC) can be easily implemented using internal carry chains in a field-programmable gate array, and hence, its use is widespread. However, the tapped delay line TDC suffers from performance degradation because of differences in the delay times of dedicated carry chains. In this paper, a dual edge measurement method is proposed instead of a typical step signal to the delay cell to compensate for the performance degradation caused by wide-delay cells in carry chains. By applying a pulse of a fixed width as an input to the carry chains and using the time information between the up and down edges of the signal pulse, the timing accuracy can be increased. Two dedicated carry chain sites are required for the dual edge measurements. By adopting the proposed dual edge measurement method, the average delay widths of the two carry chains were improved by more than 35%, from 17.3 ps and 16.7 ps to 11.2 ps and 10.1 ps, respectively. In addition, the maximum delay times were improved from 41.4 ps and 42.1 ps to 20.1 ps and 20.8 ps, respectively.
A Study on the Action Potential Generations of the Vestibular Hair Cell Model with Negative Stiffness Feature
Kim, Dongyoung ; Hong, Kihwan ; Kim, Kyu-Sung ; Lee, Sangmin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 190~199
DOI : 10.5573/ieie.2014.51.9.190
In this paper, the vestibular hair bundle feature model and integrated vestibular hair cell model were proposed. In conventional modeling studies of vestibular system, only partial mechanisms were modeled, such as the characteristics of the vestibular hair bundles without external forces or the action potential of synapse, and the study about action potential of vestibular afferent considering the characteristics of the vestibular hair bundle was not performed. The proposed integrated vestibular hair cell model reflects external forces considering negative stiffness features of each hair bundles with different regularities of hair cells and our model was compared with conventional model without external forces. As a result, irregular afferent and intermediate afferent with high ratio of firing frequency variations to the changes of external stimulation had small width of negative stiffness section, but the width of the negative stiffness of regular afferent with low ratio was similar to that of conventional negative stiffness features. And the proposed integrated vestibular hair cell model showed almost same results with conventional data with animal experiments in 11 chosen frequency bands. It is verified that our proposed hair bundle feature model is adequately modeled.
Adaptive Detection of Unusual Heartbeat According to R-wave Distortion on ECG Signal
Lee, SeungMin ; Ryu, ChunHa ; Park, Kil-Houm ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 200~207
DOI : 10.5573/ieie.2014.51.9.200
Arrhythmia electrocardiogram signal contains a specific unusual heartbeat with abnormal morphology. Because unusual heartbeat is useful for diagnosis and classification of various diseases, such as arrhythmia, detection of unusual heartbeat from the arrhythmic ECG signal is very important. Amplitude and kurtosis at R-peak point and RR interval are characteristics of ECG signal on R-wave. In this paper, we provide a method for detecting unusual heartbeat based on these. Through the value of the attribute deviates more from the average value if unusual heartbeat is more certainly, the proposed method detects unusual heartbeat in order using the mean and standard deviation. From 15 ECG signals of MIT-BIH arrhythmia database which has R-wave distortion, we compare the result of conventional method which uses the fixed threshold value and the result of proposed method. Throughout the experiment, the sensitivity is significantly increased to 97% from 50% using the proposed method.
Vehicle Dynamics and Road Slope Estimation based on Cascade Extended Kalman Filter
Kim, Moon-Sik ; Kim, Chang-Il ; Lee, Kwang-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 208~214
DOI : 10.5573/ieie.2014.51.9.208
Vehicle dynamic states used in various advanced driving safety systems are influenced by road geometry. Among the road geometry information, the vehicle pitch angle influenced by road slope and acceleration-deceleration is essential parameter used in pose estimation including the navigation system, advanced adaptive cruise control and others on sag road. Although the road slope data is essential parameter, the method measuring the parameter is not commercialized. The digital map including the road geometry data and high-precision DGPS system such as DGPS(Differential Global Positioning System) based RTK(Real-Time Kinematics) are used unusually. In this paper, low-cost cascade extended Kalman filter(CEKF) based road slope estimation method is proposed. It use cascade two EKFs. The EKFs use several measured vehicle states such as yaw rate, longitudinal acceleration, lateral acceleration and wheel speed of the rear tires and 3 D.O.F(Degree Of Freedom) vehicle dynamics model. The performance of proposed estimation algorithm is evaluated by simulation based on Carsim dynamics tool and T-car based experiment.
Power Control Design and Application to Research Reactor
Baang, Dane ; Lee, Jongbok ; Suh, Yongsuk ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 215~220
DOI : 10.5573/ieie.2014.51.9.215
Study and application result of power controller to research reactor is presented. Considering safety-oriented design concept and other control environment, we developed a simple closed-loop controller that provides limiting function of power-change-rate as well as low-overshoot and fine tracking performance. The design result has been well-proven via simulation and actual application to a research reactor.
A Study on the Improving Practical Education for Electronic Design Ability
Lee, Won-Seok ; Ahn, Tae-Won ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 223~228
DOI : 10.5573/ieie.2014.51.9.223
In this paper, a curriculum-based electronic design project with a improved training kit is discussed. Students can raise the practical ability for comprehension and analysis of electronic circuits by the design and assembly of electronic components and measurement practice and learning the process closely. The products of this paper can be utilized as hands-on training for increasing confidence in the improving education for creative practical electronic design ability.
A Bit-rate Converter for Selective Coding
Lee, Jongbae ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 229~237
DOI : 10.5573/ieie.2014.51.9.229
This paper presents a video bitrate converter for baseline profile in H.264/AVC standards to control a selective coding scheme for several applications such as tactical scenes or multimedia area. Transmission channels have various capacities according to the application area, and the bitstream stored in computer should be converted in order not to exceed the capacities of a transmission channel. So the problem is how to convert compressed bitsreams of a given bit-rate into compressed bitsreams of other bit-rates. Such a specific transcoding problem in this paper is referred to as bit-rate conversion. Several researches have been done on bit-rate conversion for the bitstreams compressed by MPEG or H.264/AVC. But the existing schemes are not suitable for selective coding scheme because it needs to recover interest regions better image quality than background. So we propose a new bit-rate converter which considers the importance between interest regions and background.
Design of Driving Control Unit and Milking Robot Manipulator
Shin, Kyoo Jae ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 9, 2014, Pages 238~247
DOI : 10.5573/ieie.2014.51.9.238
The milking robot system is very important to detect correctly the teats position in the moving condition of cow. Also, the robot manipulator must control tracking the teat cup to the detected teat position. The presented milking robot is designed using the one point laser sensor for teat position detection. The teats of cow are detected by the laser scanning unit and the manipulator has the function of 3 axes moving control unit. The presented teat detection method and the electrical driving manipulator have the advantages of a simple, low cost and very quiet. The designed manipulator is realized by the totally electrical motor and servo poison control algorithm with velocity PID compensation. The presented robot is realized using the teat detection unit, 4 teat cups, 3 axes robot arm, 6 servo motors and automatic milking control line. The designed robot is experimented in the cow farm and is satisfied with the designed performance specification for milking robot manipulator.