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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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The New Block Circulant Hadamard Matrices
Park, Ju Yong ; Lee, Moon Ho ; Duan, Wei ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 3~10
DOI : 10.5573/ieie.2014.51.5.003
In this paper we review the typical Toeplitz matrices and block circulant matrices, and propose the a circulant Hadamard matrix which is consisted of +1 and -1, but its structure is different from typical Hadamard matrix. The proposed circulant Hadamard matrix decreases computational complexities to
additions through high speed algorithm compare to original one. This matrix is able to be applied to Massive MIMO channel estimation, FIR filter design, amd signal processing.
A Parallel Sphere Decoder Algorithm for High-order MIMO System
Koo, Jihun ; Kim, Jaehoon ; Kim, Yongsuk ; Kim, Jaeseok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 11~19
DOI : 10.5573/ieie.2014.51.5.011
In this paper, a low complexity parallel sphere decoder algorithm is proposed for high-order MIMO system. It reduces the computational complexity compared to the fixed-complexity sphere decoder (FSD) algorithm by static tree-pruning and dynamic tree-pruning using scalable node operators, and offers near-maximum likelihood decoding performance. Moreover, it also offers hardware-friendly node operation algorithm through fixing the variable computational complexity caused by the sequential nature of the conventional SD algorithm. A Monte Carlo simulation shows our proposed algorithm decreases the average number of expanded nodes by 55% with only 6.3% increase of the normalized decoding time compared to a full parallelized FSD algorithm for high-order MIMO communication system with 16 QAM modulation.
Real-time Faulty Node Detection scheme in Naval Distributed Control Networks using BCH codes
Noh, Dong-Hee ; Kim, Dong-Seong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 20~28
DOI : 10.5573/ieie.2014.51.5.020
This paper proposes a faulty node detection scheme that performs collective monitoring of a distributed networked control systems using interval weighting factor. The algorithm is designed to observe every node's behavior collectively based on the pseudo-random Bose-Chaudhuri-Hocquenghem (BCH) code. Each node sends a single BCH bit simultaneously as a replacement for the cyclic redundancy check (CRC) code. The fault judgement is performed by performing sequential check of observed detected error to guarantee detection accuracy. This scheme can be used for detecting and preventing serious damage caused by node failure. Simulation results show that the fault judgement based on decision pattern gives comprehensive summary of suspected faulty node.
Optimization of the Number of Active Antennas for Energy-Efficiency in the MIMO Broadcast Channel
Choi, Seungkyu ; Kim, Dohoon ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 29~34
DOI : 10.5573/ieie.2014.51.5.029
We introduce a number of antenna optimization problem for the zero-forcing beamforming (ZFBF) scheme to enhance energy-efficiency (EE) of the multiple-input-multiple-output broadcast channel. For proposed optimization problem, we assume an instantaneous channel gain of the ZFBF scheme as an average channel gain, given by
, in order to reduce a computational complexity of finding the number of active antennas
. Then, we convert a fractional-form objective function into a subtractive-form, and find a solution of
and the maximum EE by an iterative process. Simulation results show that the maximum EE value obtained by proposed algorithm is almost identical to the optimal EE value by the exhaustive search method.
Enhancement for Performance of Monopulse and Target Tracking for Communication Signal Tracking
Kil, Hyun Joo ; Lee, Young Jin ; Kim, Jae Sin ; Lee, Eun Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 35~43
DOI : 10.5573/ieie.2014.51.5.035
In this paper, we propose a performance enhancement method of the target tracking system for communication signal using the monopulse and the
filter to keep the connection of the communication system between the airplane and the ground. We suggest the minimum distance measurement method for tracking error angle of the monopulse signal instead of the generally used method of MR(Monopulse Ratio) curve, and the
filter with variable gain for enhancement of the tracking accuracy and the probability of re-tracking the monopulse signal under the disconnection of link. We show the performance enhancement of the proposed method of monopulse system using the measured MR Curve results of the prototype system. And also, the comparison of simulation results between the
filter with variable gain and the
filter with fixed gain shows the performance enhancement of the proposed
filter. Using the proposed methods, we expect the enhanced performance of the existing target tracking system for communication signal only by changing the algorithm without hardware changes.
Characteristic Analysis of Proposed Chaos Map in CDSK System
Lee, Jun-Hyun ; Ryu, Heung-Gyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 44~50
DOI : 10.5573/ieie.2014.51.5.044
Chaos communication system is one of the security algorithms that is applied to improve the security. Chaos signal is non-linear, and it is generated randomly according to the initial conditions. Also, chaos communication system has characteristics such as non-periodic, wide-band, non-predictability of signals and easy implementation. So, security of chaos communication system is superior, and it has low interception probability and good anti-jamming characteristic. However, BER performance is worse than digital communication system, because it has many self interference signal in case of CDSK system. To improve these disadvantages, we analyze the PDF trend which can improve the BER performance in existing study, and we proposed a chaos map. And, proposed chaos map was defined as the 'Boss map'. Generally, BER performance is changed according to initial values, parameters and spreading factors. Therefore, in this paper, we will introduce PDF trends which can improve the BER performance, and will describe about Boss map. Also, characteristics of Boss map is analyzed by evaluating the BER performance of Boss map according to initial values, parameters and spreading factors. As a result, while maintaining the similar BER performance, initial value of Boss map can be selected from 0 to 1.2, and BER performance is best when parameter alpha is 2.5. Also, BER performance is best when spreading factor is 50.
An Evolutionary Algorithm to the Threshold Detection Method for the M-ary Holographic Data Storage
Kim, Sunho ; Lee, Jieun ; Im, Sungbin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 51~57
DOI : 10.5573/ieie.2014.51.5.051
In this paper, we introduce the adaptive threshold detection scheme based on an evolutionary arithmetic algorithm for the M-ary holographic data storage(HDS) system. The genetic algorithm is a particular class of evolutionary arithmetic based on the process of biological evolution, which is a very promising technique for optimization problem and estimation applications. In this study, to improve the detection performance that is degraded by the HDS channel environment and the pixel misalignment, the threshold value was assumed to be a population set of the evolutionary algorithm. The proposed method can find an appropriate population set of bit threshold, which minimizes bit error rate(BER) as increased generation. For performance evaluation, we consider severe misalignment effect in the 4-ary holographic data storage system. Furthermore, we measure the BER performance and compare the proposed methods with the conventional threshold detection scheme, which verifies the superiority of the proposed scheme.
Conceptual Design of Emergency Communication System to Cope with Severe Accident in Nuclear Power Plants
Son, Kwang Seop ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 58~69
DOI : 10.5573/ieie.2014.51.5.058
To cope with sever accident like Fukushima accident, the emergency response system is needed. It consist of the hardened I&C system and the mobile control station. The hardened I&C system monitors the state in the nuclear power plant and controls the emergency equipment such as valves, pumps and the mobile control station placed at 30km away from nuclear power plant receives the status information from the hardened I&C system and transmits the control data to the hardened I&C system. In this paper, we design the emergency communication system connecting the hardened I&C system to the mobile control station and analyze the performance of the system. This system consists of the terrestrial communication system and the satellite communication. The performance such as a communication link budget, throughput and delay time is analyzed for each system.
The Nonlinear Equalizer for Super-RENS Read-out Signals using an Asymmetric Waveform Model
Moon, Woosik ; Park, Sehwang ; Lee, Jieun ; Im, Sungbin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 70~75
DOI : 10.5573/ieie.2014.51.5.070
Super-resolution near-field structure (super-RENS) read-out samples are affected by a nonlinear and noncausal channel, which results in inter-symbol interference (ISI). In this study, we investigate asymmetry or domain bloom in super-RENS in terms of equalization. Domain bloom is caused by writing process in optical recording. We assume in this work that the asymmetry symbol conversion scheme is to generate asymmetric symbols, and then a linear finite impulse response filter can model the read-out channel. For equalizing this overall nonlinear channel, the read-out signals are deconvolved with the finite impulse response filter and its output is decided based on the decision rule table that is developed from the asymmetry symbol conversion scheme. The proposed equalizer is investigated with the simulations and the real super-RENS samples in terms of raw bit error rate.
A Strategy of the Link Saving Routing and Its Characteristics for QoS Aware Energy Saving(QAES) in IP Networks
Han, Chimoon ; Kim, Sangchul ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 76~87
DOI : 10.5573/ieie.2014.51.5.076
Today the energy consumption of ICT networks is about 10% of the worldwide power consumption and is predicted to increase remarkably in the near future. For this reason, this paper studies energy saving strategies assuring the network-level QoS. In the strategies, the energy consumption of NIC(network interface card) on both endpoint of links decreases by selecting links and making them sleep when the total traffic volume of the IP network is lower than a threshold. In this paper, we propose a heuristic routing algorithm based on so-called delegating/delegated routers, and evaluate its characteristics using computer simulation considering network-level QoS. The selection of sleep links is determined in terms of the number of traffic paths (called min_used path) or the amount of traffics(called min_used traffic) through those kinks. To our experiment, the min_used traffic method shows a little better energy saving but the increased path length compared to the min_used path method. Those two methods have better energy saving characteristics than the random method. This paper confirms that the delegating/delegated router-based routing algorithm results in energy saving effects and sustains network-level QoS in IP networks.
Analysis on the Contribution of FDOA Measurement Accuracy to the Performance of Combined TDOA/FDOA Localization Systems
Kim, Dong-Gyu ; Kim, Yong-Hee ; Han, Jin-Woo ; Song, Kyu-Ha ; Kim, Hyoung-Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 88~96
DOI : 10.5573/ieie.2014.51.5.088
In modern electronic warfare systems, the necessity of a more accurate estimation method based on non-AOA (arrival of angle) measurement, such as TDOA and FDOA, have been increased. The previous researches using single TDOA have been carried out in terms of not only the development of emitter location algorithms but also the enhancement of measurement accuracy. Recently, however, the combined TDOA/FDOA method is of considerable interest because it is able to estimate the velocity vector of a moving emitter and acquire a pair of TDOA and FDOA measurements from a single sensor pair. In this circumstance, it is needed to derive the required FDOA measurement accuracy in order that the TDOA/FDOA combined localization system outperforms the previous single TDOA localization systems. Therefore, we analyze the contribution of FDOA measurement accuracy to emitter location, then propose the criterion based on CRLB (Cramer-Rao lower bound). Simulations are included to examine the validity of the proposed criterion by using the Gauss-Newton algorithm.
A Reference Spur Suppressed PLL with Two-Symmetrical Loops
Choi, Hyun-Woo ; Choi, Young-Shig ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 99~105
DOI : 10.5573/ieie.2014.51.5.099
A reference spur suppressed PLL with two-symmetrical loops without changing the bandwidth which is optimized to suppress phase noise and reduce locking time has been designed. The principle of suppressing a reference signal spur is to stabilize the input voltage of voltage controlled oscillator (VCO). The proposed PLL consists of a phase-frequency detector(PFD) which has two outputs, two charge pumps(CP), two loop filters(LF), a divider and a VCO which has two inputs. Simulation results with
CMOS process show that the reference spur is approximately suppressed to 1/2 of the reference spur in a conventional PLL. Even though there is a 5% process variation in the magnitude of R and C, the simulation result shows that the reference spur is still suppressed to 1/2 of the reference spur in a conventional PLL. The power consumption is 6.3mW at the power supply of 1.8V.
FDR Test Compression Algorithm based on Frequency-ordered
Mun, Changmin ; Kim, Dooyoung ; Park, Sungju ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 106~113
DOI : 10.5573/ieie.2014.51.5.106
Recently, to reduce test cost by efficiently compressing test patterns for SOCs(System-on-a-chip), different compression techniques have been proposed including the FDR(Frequency-directed run-length) algorithm. FDR is extended to EFDR(Extended-FDR), SAFDR(Shifted-Alternate-FDR) and VPDFDR(Variable Prefix Dual-FDR) to improve the compression ratio. In this paper, a frequency-ordered modification is proposed to further augment the compression ratios of FDR, EFDR, SAFRD and VPDFDR. The compression ratio can be maximized by using frequency-ordered method and consequently the overall manufacturing test cost and time can be reduced significantly.
An Analysis of Memory Access Complexity for HEVC Decoder
Jo, Song Hyun ; Kim, Youngnam ; Song, Yong Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 114~124
DOI : 10.5573/ieie.2014.51.5.114
HEVC is a state-of-the-art video coding standard developed by JCT-VC. HEVC provides about 2 times higher subjective coding efficiency than H.264/AVC. One of the main goal of HEVC development is to efficiently coding UHD resolution video so that HEVC is expected to be widely used for coding UHD resolution video. Decoding such high resolution video generates a large number of memory accesses, so a decoding system needs high-bandwidth for memory system and/or internal communication architecture. In order to determine such requirements, this paper presents an analysis of the memory access complexity for HEVC decoder. we first estimate the amount of memory access performed by software HEVC decoder on an embedded system and a desktop computer. Then, we present the memory bandwidth models for HEVC decoder by analyzing the data flow of HEVC decoding tools. Experimental results show the software decoder produce 6.9-40.5 GB/s of DRAM accesses. also, the analysis reveals the hardware decoder requires 2.4 GB/s of DRAM bandwidth.
A Detect and Defense Mechanism of Stateful DRDoS Attacks
Kim, Minjun ; Seo, Kyungryong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 127~134
DOI : 10.5573/ieie.2014.51.5.127
In DRDoS(Distributed Reflective Denial of Service) attacks, the victim is bombarded by packets from legitimate reflector unlike DDoS(Distributed Denial of Service) attacks through zombie, which is more dangerous than DDoS attack because it is in stronger disguise. Therefore, the method of filtering packet method on router are useless. Moreover SCTP(Stream Control Transmission Protocol) multi-homing feature, such as with an improved transmission protocol allows detecting attacks is more difficult and the effect of the attack can be maximized. In this paper we propose a DRDoS detection mechanism based on DRDoS utilizing attention to the characteristics of stateful protocols. The proposed scheme is backed by stateful firewall, and detect DRDoS attacks through a rules table and perform a defense treatment against DRDoS attack. Rules table with a simple structure is possible to easily adapt for any kind of stateful protocol can used by DRDoS attack. The experimental result confirm that our proposed scheme well detect DRDoS attacks using SCTP, the next-generation transmission protocol which not known by victim, and reduce the attacking packets rapidly.
Automatic Detection of Objects-of-Interest using Visual Attention and Image Segmentation
Shi, Do Kyung ; Moon, Young Shik ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 137~151
DOI : 10.5573/ieie.2014.51.5.137
This paper proposes a method of detecting object of interest(OOI) in general natural images. OOI is subjectively estimated by human in images. The vision of human, in general, might focus on OOI. As the first step for automatic detection of OOI, candidate regions of OOI are detected by using a saliency map based on the human visual perception. A saliency map locates an approximate OOI, but there is a problem that they are not accurately segmented. In order to address this problem, in the second step, an exact object region is automatically detected by combining graph-based image segmentation and skeletonization. In this paper, we calculate the precision, recall and accuracy to compare the performance of the proposed method to existing methods. In experimental results, the proposed method has achieved better performance than existing methods by reducing the problems such as under detection and over detection.
Detection of Spliced Image Using Run-length of Wavelet Coefficients and Statistical Moments
Kim, Tae-Hyung ; Han, Jong-Goo ; Park, Tae-Hee ; Eom, Il-Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 152~159
DOI : 10.5573/ieie.2014.51.5.152
In this paper, we introduce a run-length for wavelet coefficients and present a image splicing detection method using the statistical moments for the wavelet run-length. Various pre-processings for the suspicious image are performed to emphasize the discontinuous edges caused by the image splicing. The proposed scheme has the merit that can exploit the various statistical characteristics of the wavelet transform. We extracted up to 72 features, and performed training and testing using SVM(support vector machine). Experimental results showed that the proposed method generates similar detection results compared to the existing methods. In addition, we showed the wavelet domain run-length is useful to detect the spliced image.
Color Image Splicing Detection using Benford's Law and color Difference
Moon, Sang-Hwan ; Han, Jong-Goo ; Moon, Yong-Ho ; Eom, Il-Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 160~167
DOI : 10.5573/ieie.2014.51.5.160
This paper presents a spliced color image detection method using Benford' Law and color difference. For a suspicious image, after color conversion, the discrete wavelet transform and the discrete cosine transform are performed. We extract the difference between the ideal Benford distribution and the empirical Benford distribution of the suspicious image as features. The difference between Benford distributions for each color component were also used as features. Our method shows superior splicing detection performance using only 13 features. After training the extracted feature vector using SVM classifier, we determine whether the presence of the image splicing forgery. Experimental results show that the proposed method outperforms the existing methods with smaller number of features in terms of splicing detection accuracy.
A Framework for Object Detection by Haze Removal
Kim, Sang-Kyoon ; Choi, Kyoung-Ho ; Park, Soon-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 168~176
DOI : 10.5573/ieie.2014.51.5.168
Detecting moving objects from a video sequence is a fundamental and critical task in video surveillance, traffic monitoring and analysis, and human detection and tracking. It is very difficult to detect moving objects in a video sequence degraded by the environmental factor such as fog. In particular, the color of an object become similar to the neighbor and it reduces the saturation, thus making it very difficult to distinguish the object from the background. For such a reason, it is shown that the performance and reliability of object detection and tracking are poor in the foggy weather. In this paper, we propose a novel method to improve the performance of object detection, combining a haze removal algorithm and a local histogram-based object tracking method. For the quantitative evaluation of the proposed system, information retrieval measurements, recall and precision, are used to quantify how well the performance is improved before and after the haze removal. As a result, the visibility of the image is enhanced and the performance of objects detection is improved.
Mean Square Projection Error Gradient-based Variable Forgetting Factor FAPI Algorithm
Seo, YoungKwang ; Shin, Jong-Woo ; Seo, Won-Gi ; Kim, Hyoung-Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 177~187
DOI : 10.5573/ieie.2014.51.5.177
This paper proposes a fast subspace tracking methods, which is called GVFF FAPI, based on FAPI (Fast Approximated Power Iteration) method and GVFF RLS (Gradient-based Variable Forgetting Factor Recursive Lease Squares). Since the conventional FAPI uses a constant forgetting factor for estimating covariance matrix of source signals, it has difficulty in applying to non-stationary environments such as continuously changing DOAs of source signals. To overcome the drawback of conventioanl FAPI method, the GVFF FAPI uses the gradient-based variable forgetting factor derived from an improved means square error (MSE) analysis of RLS. In order to achieve the decreased subspace error in non-stationary environments, the GVFF-FAPI algorithm used an improved forgetting factor updating equation that can produce a fast decreasing forgetting factor when the gradient is positive and a slowly increasing forgetting factor when the gradient is negative. Our numerical simulations show that GVFF-FAPI algorithm offers lower subspace error and RMSE (Root Mean Square Error) of tracked DOAs of source signals than conventional FAPI based MUSIC (MUltiple SIgnal Classification).
Speech Segmentation using Weighted Cross-correlation in CASA System
Kim, JungHo ; Kang, ChulHo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 188~194
DOI : 10.5573/ieie.2014.51.5.188
The feature extraction mechanism of the CASA(Computational Auditory Scene Analysis) system uses time continuity and frequency channel similarity to compose a correlogram of auditory elements. In segmentation, we compose a binary mask by using cross-correlation function, mask 1(speech) has the same periodicity and synchronization. However, when there is delay between autocorrelation signals with the same periodicity, it is determined as a speech, which is considered to be a drawback. In this paper, we proposed an algorithm to improve discrimination of channel similarity using Weighted Cross-correlation in segmentation. We conducted experiments to evaluate the speech segregation performance of the CASA system in background noise(siren, machine, white, car, crowd) environments by changing SNR 5dB and 0dB. In this paper, we compared the proposed algorithm to the conventional algorithm. The performance of the proposed algorithm has been improved as following: improvement of 2.75dB at SNR 5dB and 4.84dB at SNR 0dB for background noise environment.
Filter Selection Method Using CSP and LDA for Filter-bank based BCI Systems
Park, Geun-Ho ; Lee, Yu-Ri ; Kim, Hyoung-Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 197~206
DOI : 10.5573/ieie.2014.51.5.197
Motor imagery based Brain-computer Interface(BCI), which has recently attracted attention, is the technique for decoding the user's voluntary motor intention using Electroencephalography(EEG). For classifying the motor imagery, event-related desynchronization(ERD), which is the phenomenon of EEG voltage drop at sensorimotor area in
-band(8-13Hz), has been generally used but this method are not free from the performance degradation of the BCI system because EEG has low spatial resolution and shows different ERD-appearing band according to users. Common spatial pattern(CSP) was proposed to solve the low spatial resolution problem but it has a disadvantage of being very sensitive to frequency-band selection. Discriminative filter bank common spatial pattern(DFBCSP) tried to solve the frequency-band selection problem by using the Fisher ratio of the averaged EEG signal power and establishing discriminative filter bank(DFB) which only includes the feature frequency-band. However, we found that DFB might not include the proper filters showing the spatial pattern of ERD. To solve this problem, we apply a band-selection process using CSP feature vectors and linear discriminant analysis to DFBCSP instead of the averaged EEG signal power. The filter selection results and the classification accuracies of the existing and the proposed methods show that the CSP feature is more effective than signal power feature.
Design Scheme of A Micro Real-Time Control System with CAN and RTOS
Lim, Young-Gyu ; Kim, Dong-Seoung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 207~215
DOI : 10.5573/ieie.2014.51.5.207
In this paper, we propose a Micro Real-Time Control System (MRTCS) for decreasing the delay during interrupts processing and data transfer on sensor nodes. The MRTCS consists of a control, sensor nodes based on Controller Area Network (CAN) device. The control node was designed with Real Time Operating System (RTOS) on top of the small Micro Control Unit (sMCU). Sensor nodes have the CAN device without sMCU, which have multiple Digital Inputs, Outputs (DI/DO) and the CAN controller. We have evaluated with OCTAVE v3.6.4 from open source for system performance. Simulation results show that the system performance was increased through the delay reducing for interrupt processing and internal data transfer. We verify that a proposed MRTCS approach will be adapted to various real-time control system.
An Integrated Circuit design for Power Factor Correction
Lee, Jun-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 5, 2014, Pages 219~225
DOI : 10.5573/ieie.2014.51.5.219
This paper describes an IC for Power Factor Correction. It can use electrical appliances which convert power from AC to DC. The power factor can be influenced not only phase difference of voltage and current but also sudden change of current waveform. This circuit enables current wave supplied to load by close to sinusoidal and minimum phase difference of voltage and current waveform. A self oscillated 10[kHz]~100[kHz] pulse signal converted to PWM waveform and it chops rectified full wave AC power which flows to load device. The multiplier and zero current detector circuit, UVLO, OVP, BGR circuits were designed. This IC has been designed and whole chip simulation use 0.5[um] double poly, double metal 20[V] CMOS process.