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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 50, Issue 12 - Dec 2013
Volume 50, Issue 11 - Nov 2013
Volume 50, Issue 10 - Oct 2013
Volume 50, Issue 9 - Sep 2013
Volume 50, Issue 8 - Aug 2013
Volume 50, Issue 7 - Jul 2013
Volume 50, Issue 6 - Jun 2013
Volume 50, Issue 5 - May 2013
Volume 50, Issue 4 - Apr 2013
Volume 50, Issue 3 - Mar 2013
Volume 50, Issue 2 - Feb 2013
Volume 50, Issue 1 - Jan 2013
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Energy-Efficient Base Station Operation With Base Station Sharing in Wireless Cellular Networks
Oh, Eunsung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 3~8
DOI : 10.5573/ieek.2013.50.1.003
In this paper, we present an energy-efficient base station operation with base station sharing in wireless cellular networks. Firstly, cost functions are modeled related with the amount of energy usage and traffic load. We use game theory and formulate an energy bill game, where the players are the service operators which are operating base stations and their strategies are the bill of their base station energy consumption and hand-over traffic load to the others service operators. We show that the global optimal performance in terms of minimizing the energy costs is achieved at the Nash equilibrium of the formulated energy bill game. Simulation results confirm that the proposed approach can reduce the energy bill of the service operator, and show the relationship between the energy cost saving and various parameters.
Low Complexity Bilateral Search Successive Interference Cancellation for OFDM in Fast Time-Varying Channels
Lim, Dongmin ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 9~14
DOI : 10.5573/ieek.2013.50.1.009
In this paper, we propose a low complexity bilateral search SIC for OFDM in fast time-varying channels. Due to the possibility of error propagation in SIC, symbol detection ordering within the block of symbols has a significant effect on the overall performance. In this paper, the first symbol to be detected is determined based on CSEP values, and then the next symbol to be detected is selected according to the updated CSEP while bilaterally searching from the boundary of the detected symbol group. Through computer simulations, we show that the proposed method has performance improvements with almost the same computation complexity over the conventional methods in the high SNR region. It has a performance approaching the MFB, known as the performance upper bound, within 2dB at the BER of
Performance Analysis of an Energy Detection Based Cooperative Spectrum Sensing with Double Thresholds in the Presence of Noise Uncertainty
Lim, Chang Heon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 15~20
DOI : 10.5573/ieek.2013.50.1.015
An energy detection based spectrum sensing is widely known to be susceptible to the noise power uncertainty. As one of the methods to resolve this problem, a cooperative spectrum sensing based on an energy detector with double thresholds has been published recently. However, its performance analysis under a fading channel has not been carried out yet. In this paper, we present a closed form of performance analysis of the scheme by extending our previous work on evaluating the performance of an energy detector in the presence of noise power uncertainty.
An Optimized Double-ABBA Quasi-Orthogonal Space Time Code with PIC Group Decoding
Hanif, Mohammad Abu ; Lee, Moon Ho ; Park, Ju Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 21~26
DOI : 10.5573/ieek.2013.50.1.021
In this paper we propose a system where we divide the group with 2 symbols. The two added symbols are separated by multiplexing and later added using the DE-multiplexing technique. In our proposed system a simple Partial Interference Cancelation (PIC) group decoding scheme is used for Double-ABBA(D-ABBA) Quasi-Orthogonal Space Time Code, which reduces the decoding complexity for the higher order Multiple Input Multiple Output (MIMO) space time block coding. Finally we compare the proposed scheme performance using the different modulation schemes.
Capacity Optimization of Two-way Amplify-and Forward Relay Networks
Hanif, Mohammad Abu ; Lee, Moon Ho ; Park, Ju Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 27~33
DOI : 10.5573/ieek.2013.50.1.027
In this paper, we propose a pilot based channel estimation technique in two-way relay networks. We propose to transmit a pilot symbol together with the data symbol during transmission. In absence of Channel State Information (CSI), destination uses the pilot symbol to estimate the channel. In this system, the relay amplifies the pilot and the data symbol then forward them to the destination using amplify and forward (AF) protocol. We assume that the relay gain is fixed, so the relay does not need to estimate the channel, the destination only estimate the channel. We apply well-known Least-square (LS) and minimum mean-square error (MMSE) channel estimation methods to estimate the channel.
Implementation of Virtualization Techniques and its Performance Evaluation for the Independent Operation of OpenFlow-based Future Internet Testbed
Min, Seok Hong ; Kim, Seung Ju ; Kim, Byung Chul ; Lee, Jae Yong ; Hong, Won Taek ; Kong, Jong Uk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 34~45
DOI : 10.5573/ieek.2013.50.1.034
Recently, world-wide research activities on new network architectures and protocols are being actively progressed. Furthermore, research activities on testbed and related technologies for supporting those activities are being actively performed. In domestic study, research on the OpenFlow protocol based future Internet testbed implementation and research on its virtualization for supporting independent research experiments are being performed at the same time. The network virtualization is a technology which maximizes the testbed utilization without interfering each other for the individual research when many researchers share the testbed. In this paper, we implemented a Enhanced FlowVisor by extending basic FlowVisor by adding QoS functions which are admission control and minimum bandwidth guarantee. On the testbed, we performed a real-time video streaming experiment for verifying the performance of the Enhnaced FlowVisor on the OpenFlow protocol based future internet testbed. The result shows that the Enhanced FlowVisor can provide reliable and stable QoS to the individual researches without disturbing each other traffic on virtualized networks of the future Internet testbed.
Modified Wilkinson Power Divider for nth Harmonic Suppression
Kim, Jong-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 46~50
DOI : 10.5573/ieek.2013.50.1.046
A modified design that can reject the nth harmonic components in the Wilkinson power divider is presented. After adding transmission lines of electrical lengths determined by suppression terms between two transformers of the traditional design, a solution of the modified Wilkinson divider can be found. Experimental results show the second and third harmonic suppression to be -45.3 dB and -46.4 dB, respectively, while maintaining the conventional performance at the fundamental frequency.
T-Chord Ring System based on Overlay Network for Service Discovery and Delivery in MANET
Han, Insung ; Jeong, Hongsik ; Park, Moosung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 51~63
DOI : 10.5573/ieek.2013.50.1.051
Recently with base apply MANET with the application for the service discovery and delivery which are various techniques are being proposed the result of such MANET base research techniques from actual inside. This dissertation proposes T-Chord(Trustworthy-based Chord) Ring system for MANET to guarantees from such requirements. T-Chord Ring system in order to manage Efficiently the services which the mobile nodes provide is the service discovery system which uses P2P overlay network Technique in mobile environment. The system which is proposed MANET communications in order to accomplish a service discovery operation with physical network class and logical network class will be able to minimize problems from about MANET service discoveries, and uses the dispersive hash table technique for a service discovery and effectiveness of service discovery improves and will be able to guarantee the expandability of network size. The mobile nodes(mobile device) have a mobility from MANET and operate with service request node, service provide node and service transmit node. The mobile nodes will be able to elect cluster header using Trustworthy that was evaluated service request, provision and delivery in each other. The system which is proposed a service discovery and a delivery efficiently will compose the cluster head which will grow of P2P overlay networks and will be able to accomplish. The system which proposes from dissertation is composed of Trustworthy evaluations of MANET mobile nodes, service information collection which is dispersed and P2P overlay networks that composed of Chord algorithm modules which provide O(Log N) efficiencies. The system comparison evaluation analyzes an efficiency from the expandability side of effectiveness and the network of service discovery technique and the service discovery message over head, service discovery and delivery of former times and service discovery and delivery is excellent gives proof from MANET.
Enhanced Stream Cipher Rabbit Secure Against Power Analysis Attack
Bae, KiSeok ; Ahn, MahnKi ; Park, YoungHo ; Moon, SangJae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 64~72
DOI : 10.5573/ieek.2013.50.1.064
Recently, stream cipher Rabbit was selected for the final eSTREAM portfolio organized by EU ECRYPT and as one of algorithm in part of ISO/IEC 18033-4 Stream Ciphers on ISO Security Standardization. However, a feasibility of practical power analysis attack to algorithm in experiment was introduced. Therefore, we propose appropriate methods such as random masking and hiding schemes to secure against power analysis attack on stream cipher Rabbit. We implement the proposed method with increment of 24% operating time and 12.3% memory requirements due to maintaining a high-speed performance. We use a 8-bit RISC AVR microprocessor (ATmegal128L chip) to implement our method for practical experiments, and verify that stream cipher Rabbit with our method is secure against power analysis attack.
Multibaseline based Stereo Matching Using Texture adaptive Belief Propagation Technique
Kim, JinHyung ; Ko, Yun Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 75~85
DOI : 10.5573/ieek.2013.50.1.075
To acquire depth information using stereo vision, it is required to find correspondence points between stereo image pair. Conventional stereo vision systems usually use two cameras to get disparity data. Therefore, conventional stereo matching methods cannot resolve the tradeoff problem between accuracy and precision with respect to the length of baseline. Besides, belief propagation method, which is being used recently, has a problem that matching performance is dependent on the fixed weight parameter
. In this paper, we propose a modified belief propagation stereo matching technique based on multi-baseline stereo vision to solve the tradeoff problem. The proposed method calculates EMAD(extended mean of absolute differences) as local evidence. And proposed method decides weight parameter
adaptively to local texture information. The proposed method shows higher initial matching performance than conventional methods and reached optimum solution in less iteration. The matching performance is increased about 4.85 dB in PSNR.
Research on Open Source Encoding Technology for MPEG Unified Speech and Audio Coding
Song, Jeongook ; Lee, Joonil ; Kang, Hong-Goo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 86~96
DOI : 10.5573/ieek.2013.50.1.086
Unified Speech and Audio Coding (USAC) is the speech/audio codec with the best quality, approved on Final Draft International Standard (FDIS) at MPEG meeting in 2011. Since MPEG conventionally standardizes only the decoder, it is not easy to study on the encoder technologies. Furthermore, Reference Model(RM) shows extremely poor performance. To solve these problems, the open source project(JAME) proposes the methods to make the improved performance of main encoder technologies in USAC. Especially, this paper introduces the encoder modules: the signal classifier for selective operation between two coders, the psychoacoustic model in frequency domain, and window transition technology. Finally, the results of verification test for FDIS and the performance of Common Encoder are appended.
Method of SSO Noise Reduction on FPGA of Digital Optical Units in Optical Communication
Kim, Jae Wan ; Eom, Doo Seop ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 97~101
DOI : 10.5573/ieek.2013.50.1.097
There is a growing need for optical communication systems that convert large volumes of data to optical signals and that accommodate and transmit the signals across long distances. Digital optical communication consists of a master unit (MU) and a slave unit (SU). The MU transmits data to SU using digital optical signals. However, digital optical units that are commercially available or are under development transmit data using two's complement representation. At low input levels, a large number of SSOs (simultaneous switching outputs) are required because of the high rate of bit switching in two's complement, which thereby increases the power noise. This problem reduces the overall system capability because a DSP (digital signal processor) chip (FPGA, CPLD, etc.) cannot be used efficiently and power noise increases. This paper proposes a change from two's complement to a more efficient method that produces less SSO noise and can be applied to existing digital optical units.
De-duplication of Parity Disk in SSD-Based RAID System
Yang, Yu-Seok ; Lee, Seung-Kyu ; Kim, Deok-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 105~113
DOI : 10.5573/ieek.2013.50.1.105
RAID systems have been widely used by connecting several disks in parallel structure. to resolve the delay and bottleneck of data I/O. Recently, SSD based RAID systems are emerging since SSDs have better I/O performance than HDD. However, endurance and power consumption problems due to frequent write operation in SSD based RAID system should be resolved. In this paper, we propose a de-duplication method of parity disk in SSD based RAID system with expensive update cost. The proposed method segments chunk of parity data into small pieces and removes duplicate data, therefore, it can reduce wear-leveling and power consumption by decreasing write operation for duplicated parity data. Experimental results show that bit update rate of the proposed method is 16% in total disk, 31% in parity disk less than that of existing method in RAID-6 system using EVENODD erasure code, and the power consumption of the proposed method is 30% less than that of existing method. Besides the proposed method is 12% in total disk, 32% in parity disk less than that of existing method in RAID-5 system, and the power consumption of the proposed method is 36% less than that of existing method.
Spectral Efficiency 0f Symmetric Balance Incomplete Block Design Codes
Jhee, Yoon Kyoo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 117~123
DOI : 10.5573/ieek.2013.50.1.117
By calculating the spectral efficiency of symmetric balance incomplete block design(BIBD) codes satisfying BER=
, it can be found that ideal BIBD code design with m=2 and various q's is effective when effective power is high(
dBm). But BIBD code design with q > 2 and various m's can be effective when effective power is low(
A Design of High Performance Motion Estimation Hardware for H.264/AVC
Park, Seungyong ; Ryoo, Kwangki ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 124~130
DOI : 10.5573/ieek.2013.50.1.124
In this paper, a new motion estimation algorithm with low-computational complexity is proposed to improve the performance of H.264/AVC. The proposed architecture uses the directions of the median motion vector which is computed by the motion vectors of the three neighbor macroblocks in Integer Motion Estimation. By using the directions of the vector, the proposed architecture has a single computational level instead of multi-computational levels in Integer Motion Estimation. The proposed motion estimation is synthesized using the TSMC 0.18um standard cell library. The synthesis result shows that the gate count is about 217.92K at 166MHz and it was improved about 69% compared with previous one.
IEEE 1500 Wrapper Design Technique for Pre/Post Bond Testing of TSV based 3D IC
Oh, Jungsub ; Jung, Jihun ; Park, Sungju ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 131~136
DOI : 10.5573/ieek.2013.50.1.131
TSV based 3D ICs have been widely developed with new problems at die and IC levels. It is imperative to test at post-bond as well as pre-bond to achieve high reliability and yield. This paper introduces a new testable design technique which not only test microscopic defects at TSV input/output contact at a die but also test interconnect defects at a stacked IC. IEEE 1500 wrapper cells are augmented and through at-speed tests for pre-bond die and post-bond IC, known-good-die and defect free 3D IC can be massively manufactured+.
A 8b 1GS/s Fractional Folding-Interpolation ADC with a Novel Digital Encoding Technique
Choi, Donggwi ; Kim, Daeyun ; Song, Minkyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 137~147
DOI : 10.5573/ieek.2013.50.1.137
In this paper, an 1.2V 8b 1GS/s A/D Converter(ADC) based on a folding architecture with a resistive interpolation technique is described. In order to overcome the asymmetrical boundary-condition error of conventional folding ADCs, a novel scheme with an odd number of folding blocks and a fractional folding rate are proposed. Further, a new digital encoding technique with an arithmetic adder is described to implement the proposed fractional folding technique. The proposed ADC employs an iterating offset self-calibration technique and a digital error correction circuit to minimize device mismatch and external noise The chip has been fabricated with a 1.2V 0.13um 1-poly 6-metal CMOS technology. The effective chip area is
(ADC core :
, calibration engine :
) and the power dissipation is about 350mW including calibration engine at 1.2V power supply. The measured result of SNDR is 46.22dB, when Fin = 10MHz at Fs = 1GHz. Both the INL and DNL are within 1LSB with the self-calibration circuit.
One-Chip Multi-Output SMPS using a Shared Digital Controller and Pseudo Relaxation Oscillating Technique
Park, Young-Kyun ; Lim, Ji-Hoon ; Wee, Jae-Kyung ; Lee, Yong-Keun ; Song, Inchae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 148~156
DOI : 10.5573/ieek.2013.50.1.148
This paper suggests a multi-level and multi-output SMPS based on a shared digital logic controller through independently operating in each dedicated time periods. Although the shared architecture can be devised with small area and high efficiency, it has critical drawbacks that real-time control of each DPWM generators are impossible and its output voltage can be unstable. To solve these problems, a real-time current compensation scheme is proposed as a solution. A current consumption of the core block and entire block with four driver buffers was simulated about 4.9mA and 30mA at 10MHz switching frequency and 100MHz core operating frequency. Output voltage ripple was 11 mV at 3.3V output voltage. Over/undershoot voltage was 10mV/19.6mV at 3.3V output voltage. The noise performance was simulated at 800mA and 100KHz load regulation. Core circuit can be implemented small size in
area. For the verification of proposed circuit, the simulations were carried out with Dong-bu Hitek BCD
Digit-serial VLSI Architecture for Lifting-based Discrete Wavelet Transform
Ryu, Donghoon ; Park, Taegeun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 157~165
DOI : 10.5573/ieek.2013.50.1.157
In this paper, efficient digit-serial VLSI architecture for 1D (9,7) lifting-based discrete wavelet transform (DWT) filter has been proposed. The proposed architecture computes the DWT in digit basis, so that the required hardware is reduced. Also, the multiplication is replaced with the shift and add operation to minimize the hardware requirement. Bit allocation for input, output, and the internal data has been determined by analyzing the PSNR. We have carefully designed the data feedback latency not to degrade the performance in the recursive folded scheduling. The proposed digit-serial architecture requires small amount of hardware but achieve 100% of hardware utilization, so we try to optimize the tradeoffs between the hardware cost and the performance. The proposed architecture has been designed and verified by VerilogHDL and synthesized by Synopsys Design Compiler with a DongbuHitek
STD cell library. The maximum operating frequency is 330MHz with 3,770 gates in equivalent two input NAND gates.
On-Chip Crossbar Network Topology Synthesis using Mixed Integer Linear Programming
Jun, Minje ; Chung, Eui-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 166~173
DOI : 10.5573/ieek.2013.50.1.166
As the number of IPs and the communication volume among them have constantly increased, on-chip crossbar network is now the most widely-used on-chip communication backbone of contemporary SoCs. The on-chip crossbar network consists of multiple crossbars and the connections among the IPs and the crossbars. As the complexity of SoCs increases, it has also become more and more complex to determine the topology of the crossbar network. To tackle this problem, this paper proposes an on-chip crossbar network topology method for application-specific systems. The proposed method uses mixed integer linear programming to solve the topology synthesis problem, thus the global optimality is guaranteed. Unlike the previous MILP-based methods which represent the topology with adjacency matrixes of IPs and crossbar switches, the proposed method uses the communication edges among IPs as the basic element of the representation. The experimental results show that the proposed MILP formulation outperforms the previous one by improving the synthesis speed by 77.1 times on average, for 4 realistic benchmarks.
SOI CMOS Miniaturized Tunable Bandpass Filter with Two Transmission zeros for High Power Application
Im, Dokyung ; Im, Donggu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 174~179
DOI : 10.5573/ieek.2013.50.1.174
This paper presents a capacitor loaded tunable bandpass chip filter using multiple split ring resonators (MSRRs) with two transmission zeros. To obtain high selectivity and minimize the chip size, asymmetric feed lines are adopted to make a pair of transmission zeros located on each side of passband. Compared with conventional filters using cross-coupling or source-load coupling techniques, the proposed filter uses only two resonators to achieve high selectivity through a pair of transmission zeros. In order to optimize selectivity and sensitivity (insertion loss) of the filter, the effect of the position of asymmetric feed line on transmission zeros and insertion loss is analyzed. The SOI-CMOS switched capacitor composed of metal-insulator-metal (MIM) capacitor and stacked-FETs is loaded at outer rings of MSRRs to tune passband frequency and handle high power signal up to +30 dBm. By turning on or off the gate of the transistors, the passband frequency can be shifted from 4GH to 5GHz. The proposed on-chip filter is implemented in 0.18-
SOI CMOS technology that makes it possible to integrate high-Q passive devices and stacked-FETs. The designed filter shows miniaturized size of only
denotes the guided wave length of the
microstrip line at center frequency. The measured insertion loss (S21)is about 5.1dB and 6.9dB at 5.4GHz and 4.5GHz, respectively. The designed filter shows out-of-band rejection greater than 20dB at 500MHz offset from center frequency.
A Low Power Antenna Switch Controller IC Adopting Input-coupled Current Starved Ring Oscillator and Hardware Efficient Level Shifter
Im, Donggu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 180~184
DOI : 10.5573/ieek.2013.50.1.180
In this paper, a low power antenna switch controller IC is designed using a silicon-on-insulator (SOI) CMOS technology. To improve power handling capability and harmonic distortion performance of the antenna switch, the proposed antenna switch controller provides 3-state logic level such as +VDD, GND, and -VDD for the gate and body of switch of FETs according to decoder signal. By employing input-coupled current ring oscillator and hardware efficient level shifter, the proposed controller greatly reduces power consumption and hardware complexity. It consumes 135
at a 2.5 V supply voltage in active mode, and occupies
in area. In addition, it shows fast start-up time of 10
Transmission Power Control Scheme for VANET using STPC Algorithm
Lim, Young-Gyu ; Kim, Dong-Seoung ; Kim, Eung-Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 187~195
DOI : 10.5573/ieek.2013.50.1.187
In this paper, we propose a transmission power control scheme for performance improvement of VANET using STPC algorithm considering traffic-flow model. In traffic congestion, a transmission power between car and car increases the collision probability of control messages, which causes the problems to decrease the performance of VANET. The proposed scheme is evaluated by OPNet modeler 16.0 for analyzing its performance and effectiveness in terms of end-to-end delays in hops, packet success probability, and throughput. The simulation result show that the proposed scheme reduces a delay in hops and increases high packet transmission success ratio. Furthermore, a throughput under high density traffic is improved effectively.
Scheduling Algorithm for Military Satellite Networks using Dynamic WDRR(Weighted Deficit Round Robin)
Lee, Gi-Yeop ; Song, Kyoung-Sub ; Kim, Dong-Seong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 196~204
DOI : 10.5573/ieek.2013.50.1.196
In this paper, a scheduling algorithm is proposed for military satellite networks to improve QoS(Quality of Service) based on WDRR(Weighted Deficit Round Robin) method. When the packet size that has been queued to be larger, the proposed scheme DWDRR(Dynamic WDRR) method give appropriate additional quantum using EWMA(Exponentially Weighted Moving Average). To demonstrate an usefulness of proposed algorithm using OPNET modeler that built the simulation environment, reliability and real-time availability of the proposed algorithm is analyzed. The simulation results show an availability of proposed scheme in terms of reduce queuing delay and packet drop rate compared and analyzed the existing algorithms WRR(Weighted Round Robin), DRR(Deficit Round Robin) and WDRR with DWDRR.
The Research about Analyzing the Charging Pattern using the Electric Vehicle Running Feature Simulation
Lim, You Seok ; Bang, Chang Hyun ; Han, Seung Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 205~214
DOI : 10.5573/ieek.2013.50.1.205
In this paper, we analyzed the various EV charging-infra information(charging status, charging pattern, charging rate, charging fee, etc.) through the charging infra simulator which would be of help to effectively construct the EV charging infrastructure. The proposed simulator virtually made the EV motoring pattern referred to TMS(Traffic Monitoring System) & Ministry of Land, Transport and Maritime Affairs, and analyzed the charging-infra information(amount of charging, accumulated charging fee, etc.) based on vehicle types, charging type, time and days using EV charging-fee list noticed by KEPCO. Through this simulator, we deducted some considerable contents to build the EV charging infrastructure similarly with real environment.
B-snake Based Lane Detection with Feature Merging and Extrinsic Camera Parameter Estimation
Ha, Sangheon ; Kim, Gyeonghwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 215~224
DOI : 10.5573/ieek.2013.50.1.215
This paper proposes a robust lane detection algorithm for bumpy or slope changing roads by estimating extrinsic camera parameters, which represent the pose of the camera mounted on the car. The proposed algorithm assumes that two lanes are parallel with the predefined width. The lane detection and the extrinsic camera parameter estimation are performed simultaneously by utilizing B-snake in motion compensated and merged feature map with consecutive sequences. The experimental results show the robustness of the proposed algorithm in various road environments. Furthermore, the accuracy of extrinsic camera parameter estimation is evaluated by calculating the distance to a preceding car with the estimated parameters and comparing to the radar-measured distance.
Design of Optimized pRBFNNs-based Night Vision Face Recognition System Using PCA Algorithm
Oh, Sung-Kwun ; Jang, Byoung-Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 225~231
DOI : 10.5573/ieek.2013.50.1.225
In this study, we propose the design of optimized pRBFNNs-based night vision face recognition system using PCA algorithm. It is difficalt to obtain images using CCD camera due to low brightness under surround condition without lighting. The quality of the images distorted by low illuminance is improved by using night vision camera and histogram equalization. Ada-Boost algorithm also is used for the detection of face image between face and non-face image area. The dimension of the obtained image data is reduced to low dimension using PCA method. Also we introduce the pRBFNNs as recognition module. The proposed pRBFNNs consists of three functional modules such as the condition part, the conclusion part, and the inference part. In the condition part of fuzzy rules, input space is partitioned by using Fuzzy C-Means clustering. In the conclusion part of rules, the connection weights of pRBFNNs is represented as three kinds of polynomials such as linear, quadratic, and modified quadratic. The essential design parameters of the networks are optimized by means of Differential Evolution.
Position Estimation of MBK system for non-Gaussian Underwater Sensor Networks
Lee, Dae-Hee ; Yang, Yeon-Mo ; Huh, Kyung Moo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 232~238
DOI : 10.5573/ieek.2013.50.1.232
This paper study the position estimation of MBK system according to the non-linear filter for non-Gaussian noise in underwater sensor networks. In the filter to estimate location, recently, the extended Kalman filter (EKF) and particle filter are getting attention. EKF is widely used due to the best algorithm in the Gaussian noise environment, but has many restrictions on the usage in non-Gaussian noise environment such as in underwater. In this paper, we propose the improved One-Dimension Particle Filter (ODPF) using the distribution re-interpretation techniques based on the maximum likelihood. Through the simulation, we compared and analyzed the proposed particle filter with the EKF in non-Gaussian underwater sensor networks. In the case of both the sufficient statistical sample and the sufficient calculation capacity, we confirm that the ODPF's result shows more accurate localization than EKF's result.
A Development of Wireless Monitoring System for Temperature Monitoring by using IR Sensor
Kim, Jihee ; Kim, Sinwoo ; Kang, Yongsoo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 239~245
DOI : 10.5573/ieek.2013.50.1.239
The temperature monitoring of power cable and cable junction point is the necessary link of the safe and reliable operation of the power system. Many kinds of cables and high voltage junction points are easy to exposed continuous vibrations and momentary impulse in industry field especially power plant industries. This system can predict the overheating of the electric cable interface and the possibility of all kinds of accident, and it helps for eliminating the hazards of electric cable interface and provides the effective guarantee for the safety operation. In order to avoid the faults of the inconvenience of installation and maintenance and the high cost of application, this system used small and contactless IR sensor module. The low power consumption is used in the system. The goal of this study is the low cost and on-line reliable monitoring of power cable and junction point temperature.
Active Flow Control Technology for Vortex Stabilization on Backward-Facing Step
Lee, Jin-Ik ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 246~253
DOI : 10.5573/ieek.2013.50.1.246
This paper addresses the technology of active flow control for stabilizing a flow field. In order for flow field modeling from the control point of view, the huge-data set from CFD(computational fluid dynamics) are reduced by using a POD(Proper Orthogonal Decomposition) method. And then the flow field is expressed with dynamic equation by low-order modelling approach based on the time and frequency domain analysis. A neural network flow estimator from the pressure information measured on the surface is designed for the estimation of the flow state in the space. The closed-loop system is constructed with feedback flow controller for stabilizing the vortices on the flow field.
Study on The Electromagnetism of Interior Permanent Magnet Synchronous Motor due to Field Weakening
Kwon, Soon-O ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 254~260
DOI : 10.5573/ieek.2013.50.1.254
This paper deals with electromagnetic characteristics of IPMSM (Interior Permanent Magnet Synchronous motor) caused by field weakening current control. In order to extend operation speed, field weakening current control is generally used in IPMSM operation. During field weakening, distorted linkage fluxes are resulted by saturation of core material. Therefore, distorted input voltage waveform is required for sinusoidal current input. As the current vector angle increases for field weakening, distortion of linkage flux and back-emf becomes significant. This situation is analyzed by 2-dimensional finite element analysis and verified by experiment. With the results, it is concluded that motor parameters, such as linkage flux by permanent magnet, phase resistance, d-q axis inductance, are insufficient for estimating required voltage for given speed especially in field weakening and additional considerations for increased harmonics of voltage are required.
The Study of Methods for Improve the Linearity of the Walking Assistant Robot to Move on Lateral Slopes
Lee, Won-Young ; Eom, Su-Hong ; Jang, Mun-Suck ; Kwon, O-Sang ; Lee, Eung-Hyuk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 261~268
DOI : 10.5573/ieek.2013.50.1.261
In this paper, we propose the algorithm that improves the linearity of the walking assistant robot on lateral slopes. The walking assistant robot goes out of the course due to the rotational moment which is caused by the weight of the robot and the slope. To compensate this, we give the weight to each driving axle after comparing the real rotational angular velocity with the target rotational angular velocity which is entered by an user. The results of applying the algorithm to the real walking assistant robot show that the yaw axis deviation of the robot without the algorithm diverges, but the yaw axis deviation of the robot with the algorithm lies within 20cm, which can be recognized as stable. In addition, the changing rate of the course deviation is stabilized and shows no more course deviation, after moving 300cm.
Modeling of Magentic Levitation Logistics Transport System Using Extreme Learning Machine
Lee, Bo-Hoon ; Cho, Jae-Hoon ; Kim, Yong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 269~275
DOI : 10.5573/ieek.2013.50.1.269
In this paper, a new modeling method of a magnetic levitation(Maglev) system using extreme learning machine(ELM) is proposed. The linearized methods using Taylor Series expansion has been used for modeling of a Maglev system. However, the numerical method has some drawbacks when dealing with the components with high nonlinearity of a Maglev system. To overcome this problem, we propose a new modeling method of the Maglev system with electro magnetic suspension, which is based on ELM with fast learning time than conventional neural networks. In the proposed method, the initial input weights and hidden biases of the method are usually randomly chosen, and the output weights are analytically determined by using Moore-Penrose generalized inverse. matrix Experimental results show that the proposed method can achieve better performance for modeling of Maglev system than the previous numerical method.
Observability Analysis of a Lever Arm Error for Velocity Matching in Transfer Alignment
Yang, Cheol-Kwan ; Shim, Duk-Sun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 276~284
DOI : 10.5573/ieek.2013.50.1.276
This paper considers the transfer alignment in the inertial navigation system and the observability analysis is performed for velocity matching. The state variable of the Kalman filter is modeled including the lever arm error and the measurement equation is obtained. The SOM(Stripped Observability Matrix) method is used for the observability analysis for various maneuvering conditions of the vehicle, which gives the full state observability condition as a specific maneuver sequence of the vehicle. While the observability analysis of a lever arm effect in the existing papers is mainly performed by simulations, we performed it analytically by the observability analysis method. The analysis result is verified using the computer simulations.
Implementation of Segway Using Pressure Sensors
Jo, Sung-Chan ; Kang, Su-Min ; Huh, Kyung-Moo ; Joo, Young-Bok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 1, 2013, Pages 285~290
DOI : 10.5573/ieek.2013.50.1.285
As well as the advanced development of modern society, and the environmental problems caused by the use of fossil fuels is emerging. So do not reap the performance level of the car to be able to replace existing fossil fuel and low-emission energy and technology development are continually strives. Therefore, this study aims to present the direction of the new interface 21st century Mobile Auto Electric Segway technology in the field of security and disadvantages based. The Segway is a problem because the control itself skewed by certain slope where the slope in the wrong adjustment tipping. In this study, the year saw the introduction of two pressure sensors(Load cell) used to solve these drawbacks, according to the ratio of the weight control methods. In addition, the ramps operate in a straightforward, using an acceleration sensor and a gyro sensor in order to compensate for the slope value in free control method to study looked. Measured by calculating the value of the occupant's weight and according to the inclination of the pressure sensor pressure sensing experiment results this year, we can see that the control variable for the change in body weight is greater than the inclination. Segway is also easy to control, and the stability of the ramps, etc. As a result, created using a pressure sensor.