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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
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Volume 50, Issue 1 - Jan 2013
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Selective-Weighted Energy Detector(S-WED) and Synchronization algorithm for IR-UWB systems
Ji, Sinae ; Kim, Jaeseok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 3~9
DOI : 10.5573/ieek.2013.50.7.003
This paper proposes a selective-weighted energy detection (S-WED) and a synchronization algorithm appropriate for it in IR-UWB system. Energy detectors that are practical in terms of implementation are employed widely for noncoherent reception in IR-UWB systems. However, they show low performance due to using the energy samples captured at symbol rate. For this reason, weighted energy detectors are developed to improve the performance of EDs. Hence, for WED, not only synchronization but also the weight coefficients are needed to be obtained prior to data detection. Meanwhile, the optimal weighting coefficients of WEDs are known to be energy values. Therefore, synchronization and the weighting coefficients can be obtained simultaneously. This paper proposes an S-WED and a simple synchronization algorithm for it in which sub-intervals having energies under a certain level are excluded in energy accumulation resulting in a simpler WED with a bit performance increase in low SNR region. The proposed algorithm is verified through simulations using the preamble symbol and channel models defined in the IEEE 802.15.4a.
An Integrated E-model Implementation for Speech Quality Measurement in VoIP and VoLTE
Kim, Bog-Soon ; Baek, Kwang-Hyun ; Cho, Gi-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 10~18
DOI : 10.5573/ieek.2013.50.7.010
With advancing of mobile communication services and commercializing of VoLTE (Voice of LTE), it is getting to pay attention on QoS of VoLTE. This paper proposes an integrated E-model in which some factors influenced to service quality of VoIP and VoLTE based voice communication system are considered in calculating the voice quality of Wideband Codec. The model aims to calculate R value which reflects the situations of access network, network characteristics, terminals' usage and mobility. We mainly deal with the integrated E-model's structure, related algorithms and optimal parameters for VoLTE. Some experiments show that the voice quality difference between VoIP and VoiceChecker, and VoLTE and POLQA, is below 10%. With the proposed model, we can calculate the voice quality by making use of the factors directly affected to service quality and the environment of VoLTE terminal and network. As a result, we can estimate the service quality in advance, without measuring it in real wireless environment.
The Toeplitz Circulant Jacket Matrices
Park, Ju Yong ; Kim, Jeong Su ; Szollosi, Ferenc ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 19~26
DOI : 10.5573/ieek.2013.50.7.019
In this paper we prove that all Jacket matrices are circulant and up to equivalence. This result leads to new constructions of Toeplitz Jacket(TJ) matrices. We present the construction schemes of Toeplitz Jacket matrices and the examples of
Toeplitz Jacket matrices. As a corollary we show that a Toeplitz real Hadamard matrix is either circulant or negacyclic.
Performance Analysis of Coordinated Multi-Point with Scheduling and Precoding schemes in LTE-Advanced System
Kim, Bora ; Moon, Sangmi ; Malik, Saransh ; Kim, Cheolsung ; Hwang, Intae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 27~33
DOI : 10.5573/ieek.2013.50.7.027
In this paper, we design and analyze the performance of Coordinated Multi-Point (CoMP) techniques to the number of users for next-generation cellular systems. We perform Monte Carlo simulations with Long Term Evolution-Advanced (LTE-Advanced) and confirm the performance from the graph of the Cumulative Distribution Function (CDF). From simulation results, we show the significant performance gain when CoMP technique is used and also show better performance when we apply the various schemes additionally as scheduling and precoding.
Comparison and Performance analysis of Wavelet OFDM system and FD-OFDM
Lee, Junseo ; Kim, Ji-Hoon ; Kim, Whanwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 34~42
DOI : 10.5573/ieek.2013.50.7.034
In this paper, we compare the performance of wavelet OFDM (Orthogonal Frequency Division Multiplexing) and FD-OFDM(Frequency diversity OFDM) system with conventional OFDM system. Wavelet OFDM system uses wavelet transform rather than Fourier transform and contains intermediate characteristics of CDM (Code Division Multiplexing) and OFDM. In wavelet OFDM system, inter-symbol interference (ISI) can be suppressed effectively and adjacent channel interference can be also minimized well. In FD-OFDM system, each parallel branch symbol is multiplied by the orthogonal sequence and distributed into all sub-carriers. Then, each sub-carrier transmits information composed of the symbol components of all parallel branches in the given frame. FD-OFDM contains the frequency diversity characteristic and, therefore, FD-OFDM can be robust to the narrowband interference. For the comparison among different systems, BER (Bit-Error Rate) performances are evaluated in the presence of narrow-band interference and a harmonic noise channel. From the evaluation results, compared to the conventional OFDM, wavelet OFDM and FD-OFDM shows better robustness against the interference and, especially, wavelet OFDM is the most robust in harmonic noise channel.
Aeronautical Telemetry Link Development for High Speed Data Transmission
Lee, Sangbum ; Choi, Seoungduck ; Kim, Whanwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 43~51
DOI : 10.5573/ieek.2013.50.7.043
This paper describes the development of the telemetry link system for the high data rate transmission in high speed rocket application. In consideration of bandwidth efficiency, frequency selective fading and doppler frequency offset, we used DQPSK instead of PCM/FM which has been the primary modulation format in aeronautical telemetry. Also we used the spatial diversity with multiple receiving antennas to mitigate multipath interference which is the dominant channel impairment and the Turbo Product Code for Forward Error Correction to improve bit error rate performance.
An Adaptive Blind Equalizer Based on Dynamic Error Signal Generation Using Equalized Output State
Oh, Kil Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 52~58
DOI : 10.5573/ieek.2013.50.7.052
This paper proposes an adaptive algorithm based on a method of dynamic error signal generation suitable for signal state by examining the equalizer output signal in blind equalization. In the proposed method, it estimates the error signals using single modulus and multiple modulus each effective to the early stage of equalization or steady-state, and it generates a new error signal from the two error estimates. Two equalizer structures are implemented and their performances are compared: 1-equalizer structure that generates a new error signal by combining the two error estimates weightedly and updates the equalizer using this, and 2-equalizer structure that updates two equalizers respectively depending on the weights of the two error signals. In the proposed method, as the error signals were generated optimally before and after the initial convergence respectively, it was confirmed by computer simulations that the equalizer was updated effectively.
Radiation Characteristics of an E-plane Linear Array Antenna Composed of Inductive Loaded Patch Antennas
Yoon, Young-Min ; Kwak, Eun-Hyuk ; Kim, Jae-Hyun ; Kim, Boo-Gyoun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 59~67
DOI : 10.5573/ieek.2013.50.7.059
The radiation characteristics of an E-plane linear array antenna composed of inductive loaded patch antennas (ILPAs) are investigated. The radiation characteristics of an ILP array antenna are significantly improved compared to those of a conventional array antenna because the mutual coupling of an ILP array antenna is very small. The patch length of a
ILPA for the enhancement of the radiation characteristics of a 5-element E-plane linear array antenna composed of ILPAs is presented.
A Proposal for Enhanced Miller Algorithm Secure Against Counter Fault Attack
Bae, Kiseok ; Park, Youngho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 68~75
DOI : 10.5573/ieek.2013.50.7.068
Recently, there has been introduced various types of pairing computations to implement ID based cryptosystem for mobile ad hoc network. According to spreading the applications of pairing computations, various fault attacks have been proposed. Among them, a counter fault attack has been considered the strongest threat. Thus this paper proposes a new countermeasure to prevent the counter fault attack on Miller's algorithm. The proposed method is able to reduce the possibility of fault propagation by a random index of intermediate values. Additionally, it is difficult to challenge fault attacks on the proposed method since a simple side channel leakage of 'if' branch is eliminated.
Gauss-Newton Based Emitter Location Method Using Successive TDOA and FDOA Measurements
Kim, Yong-Hee ; Kim, Dong-Gyu ; Han, Jin-Woo ; Song, Kyu-Ha ; Kim, Hyoung-Nam ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 76~84
DOI : 10.5573/ieek.2013.50.7.076
In the passive emitter localization using instantaneous TDOA (time difference of arrival) and FDOA (frequency difference of arrival) measurements, the estimation accuracy can be improved by collecting additional measurements. To achieve this goal, it is required to increase the number of the sensors. However, in electronic warfare environment, a large number of sensors cause the loss of military strength due to high probability of intercept. Also, the additional processes should be considered such as the data link and the clock synchronization between the sensors. Hence, in this paper, the passive localization of a stationary emitter is presented by using the successive TDOA and FDOA measurements from two moving sensors. In this case, since an independent pair of sensors is added in the data set at every instant of measurement, each pair of sensors does not share the common reference sensor. Therefore, the QCLS (quadratic correction least squares) methods cannot be applied, in which all pairs of sensor should include the common reference sensor. For this reason, a Gauss-Newton algorithm is adopted to solve the non-linear least square problem. In addition, to show the performance of the proposed method, we compare the RMSE (root mean square error) of the estimates with CRLB (Cramer-Rao lower bound) and derived the CEP (circular error probable) planes to analyze the expected estimation performance on the 2-dimensional space.
A 2.5 Gb/s Burst-Mode Clock and Data Recovery with Digital Frequency Calibration and Jitter Rejection Scheme
Jung, Jae-Hun ; Jung, Yun-Hwan ; Shin, Dong Ho ; Kim, Yong Sin ; Baek, Kwang-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 87~95
DOI : 10.5573/ieek.2013.50.7.087
In this paper, 2.5 Gb/s burst-mode clock and data recovery(CDR) is presented. Digital frequency calibration scheme is adopted to eliminate mismatch between the input data rate and the output frequency of the gated voltage controlled oscillator(GVCO) in the clock recovery circuitry. A jitter rejection scheme is also used to reduce jitter caused by input data. The proposed burst-mode CDR is designed using 0.11
CMOS technology. Post-layout simulations show that peak-to-peak jitter of the recovered data is 14 ps with 0.1 UI input referred jitter, and maximum tolerance of consecutive identical digit(CID) is 2976 bits without input data jitter. The active area occupies 0.125
without loop filter and the total power consumption is 94.5 mW.
Performance Improvement of TIPS-pentacene OTFTs by blending with Polystyrene
Kim, Jae Seon ; Song, Chung Kun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 96~101
DOI : 10.5573/ieek.2013.50.7.096
In this paper we analyzed the effects of polystyrene(PS) blended in TIPS-pentacene on the performance of OTFTs. With the various molecular weight and the content of PS the performance of TIPS-pentacene OTFTs was examined and the proper molecular weight and the content were extracted for the best results. With the molecular weight of 9,580 and 0.3 wt% of PS OTFTs produced the mobility of
, the subthreshold slope
V/dec, the threshold voltage
V, the current on/of ratio
. Additionally the suitable substrate temperature for ink jet printing of the blended TIPS-pentacene OTFTs was also extracted and it was
Dependence of Ferroelectric Film Formation Method on Electrical Characteristics in Solution-processed Ferroelectric Field Effect Transistor
Kim, Woo Young ; Bae, Jin-Hyuk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 102~108
DOI : 10.5573/ieek.2013.50.7.102
In manufacturing of solution-processed organic electronic devices, a spin coating method is frequently used, but which has a big problem. Solvent in a solution has a decisive effect such as physical and chemical damage for successive solution-based film deposition. Such a severe damage by solvent restricts for fabricating building blocks of multi-layered films from solutions. In this work, it will be shown that a proper combination of well-known solvents gives a chance to fabricate multi-layered film, also this new method was applied to make organic field effect transistor. Two types of bottom gate, bottom contact transistors were fabricated, one of which is fabricated by conventional single spin coating method, the other fabricated by double spin coating method. Compared with the electrical characteristics in a single spin coated transistor, the leakage current between source and gate electrode was decreased, ON state current was increased, and the extracted saturation mobility was multiplied more than 2.7 time for double spin coated transistors. It is suggested that the multiple coated gate dielectric structure is more desirable for high performance organic ferroelectric field effect transistors.
A Study on Optimal Design of 100 V Class Super-junction Trench MOSFET
Lho, Young Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 109~114
DOI : 10.5573/ieek.2013.50.7.109
Power MOSFET (metal-oxide semiconductor field-effect transistor) are widely used in power electronics applications, such as BLDC (Brushless Direct Current) motor and power module, etc. For the conventional power MOSFET device structure, there exists a tradeoff relationship between specific on-state resistance and breakdown voltage. In order to overcome the tradeoff relationship, a non-uniform super-junction (SJ) trench MOSFET (TMOSFET) structure for an optimal design is proposed in this paper. It is required that the specific on-resistance of non-uniform SJ TMOSFET is less than that of uniform SJ TMOSFET under the same breakdown voltage. The idea with a linearly graded doping profile is proposed to achieve a much better electric field distribution in the drift region. The structure modelling of a unit cell, the characteristic analyses for doping density, and potential distribution are simulated by using of the SILVACO TCAD 2D device simulator, Atlas. As a result, the non-uniform SJ TMOSFET shows the better performance than the uniform SJ TMOSFET in the specific on-resistance at the class of 100V.
Effect of Titanium Addition on Indium Zinc Oxide Thin Film Transistors by RF-magnetron Sputtering
Woo, Sanghyun ; Lim, Yooseong ; Yi, Moonsuk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 115~121
DOI : 10.5573/ieek.2013.50.7.115
We fabricated thin film transistors (TFTs) using TiInZnO(TiIZO) thin films as active channel layer. The thin films of TiIZO were deposited at room temperature by RF-magnetron co-sputtering system from InZnO(IZO) and Ti targets. We examined the effects of titanium addition by X-ray diffraction, X-ray photoelectron spectroscopy and the electrical characteristics of the TFTs. The TiIZO TFTs were investigated according to the radio-frequency power applied to the Ti target. We found that the transistor on-off currents were greatly influenced by the composition of titanium addition, which suppressed the formation of oxygen vacancies, because of the stronger oxidation tendency of Ti relative to that of Zn or In. A optimized TiIZO TFT with rf power 40W of Ti target showed good performance with an on/off current ratio greater than
, a field-effect mobility of 2.09 [
], a threshold voltage of 2.2 [V] and a subthreshold swing of 0.492 [V/dec.].
A 1.1V 12b 100MS/s 0.43㎟ ADC based on a low-voltage gain-boosting amplifier in a 45nm CMOS technology
An, Tai-Ji ; Park, Jun-Sang ; Roh, Ji-Hyun ; Lee, Mun-Kyo ; Nah, Sun-Phil ; Lee, Seung-Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 122~130
DOI : 10.5573/ieek.2013.50.7.122
This work proposes a 12b 100MS/s 45nm CMOS four-step pipeline ADC for high-speed digital communication systems requiring high resolution, low power, and small size. The input SHA employs a gate-bootstrapping circuit to sample wide-band input signals with an accuracy of 12 bits or more. The input SHA and MDACs adopt two-stage op-amps with a gain-boosting technique to achieve the required DC gain and high signal swing range. In addition, cascode and Miller frequency-compensation techniques are selectively used for wide bandwidth and stable signal settling. The cascode current mirror minimizes current mismatch by channel length modulation and supply variation. The finger width of current mirrors and amplifiers is laid out in the same size to reduce device mismatch. The proposed supply- and temperature-insensitive current and voltage references are implemented on chip with optional off-chip reference voltages for various system applications. The prototype ADC in a 45nm CMOS demonstrates the measured DNL and INL within 0.88LSB and 1.46LSB, respectively. The ADC shows a maximum SNDR of 61.0dB and a maximum SFDR of 74.9dB at 100MS/s, respectively. The ADC with an active die area of
consumes 29.8mW at 100MS/s and a 1.1V supply.
A Latency Optimization Mapping Algorithm for Hybrid Optical Network-on-Chip
Lee, Jae Hun ; Li, Chang Lin ; Han, Tae Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 131~139
DOI : 10.5573/ieek.2013.50.7.131
To overcome the limitations in performance and power consumption of traditional electrical interconnection based network-on-chips (NoCs), a hybrid optical network-on-chip (HONoC) architecture using optical interconnects is emerging. However, the HONoC architecture should use circuit-switching scheme owing to the overhead by optical devices, which worsens the latency unfairness problem caused by frequent path collisions. This resultingly exert a bad influence in overall performance of the system. In this paper, we propose a new task mapping algorithm for optimizing latency by reducing path collisions. The proposed algorithm allocates a task to a certain processing element (PE) for the purpose of minimizing path collisions and worst case latencies. Compared to the random mapping technique and the bandwidth-constrained mapping technique, simulation results show the reduction in latency by 43% and 61% in average for each
mesh topology, respectively.
High-Performance Low-Complexity Iterative BCH Decoder Architecture for 100 Gb/s Optical Communications
Yang, Seung-Jun ; Yeon, Jaewoong ; Lee, Hanho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 140~148
DOI : 10.5573/ieek.2013.50.7.140
This paper presents a iterative Bose-Chaudhuri-hocquenghem (i-BCH) code and its high-speed decoder architecture for 100 Gb/s optical communications. The proposed architecture features a very high data processing rate as well as excellent error correction capability. The proposed 6-iteration i-BCH code structure with interleaving method allows the decoder to achieve 9.34 dB net coding gain performance at
decoder output bit error rate to compensate for serious transmission quality degradation. The proposed high-speed i-BCH decoder architecture is synthesized using a 90-nm CMOS technology. It can operate at a clock frequency of 430 MHz and achieve a data processing rate of 100 Gb/s. Thus, it has potential applications in next generation forward error correction (FEC) schemes for 100 Gb/s optical communications.
Image Edge Detector Based on a Bump Circuit and the Neighbor Pixels
Oh, Kwang-Seok ; Lee, Sang-Jin ; Cho, Kyoungrok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 149~156
DOI : 10.5573/ieek.2013.50.7.149
This paper presents a hardware edge detector of image signal at pixel level of CMOS image sensor (CIS). The circuit detects edges of an image based on a bump circuit combining with the pixels. The APS converts light into electrical signals and the bump circuit compares the brightness between the target pixel and its neighbor pixels. Each column on CIS 64 by 64 pixels array shares a comparator. The comparator decides a peak level of the target pixel comparing with a reference voltage. The proposed edge detector is implemented using 0.18um CMOS technology. The circuit shows higher fill factor 34% and power dissipation by 0.9uW per pixel at 1.8V supply.
Efficient Loop Accelerator for Motion Estimation Specific Instruction-set Processor
Ha, Jae Myung ; Jung, Ho Sun ; Sunwoo, Myung Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 159~166
DOI : 10.5573/ieek.2013.50.7.159
This paper proposes an efficient loop accelerator for a motion estimation specific instruction-set processor. ME algorithms in nature contain complex and multiple loop operations. To support efficient hardware (HW) loop operations, this paper introduces four loop instructions and their specific HW architecture. The simulation results show that the proposed loop accelerator can reduce about 29% average instruction cycles for ME early-termination schemes compared with typical implementation having a combination of compare and conditional jump instructions. The proposed loop accelerator of the motion estimation specific instruction-set processor can significantly reduce the number of program memory accesses and greatly save power consumption. Hence, it can be quite suitable for low power and flexible ME implementation.
Mobile Photo Shooting Guide System for A Blind Person
Kim, Taehyub ; Kim, Doyun ; Im, Donghyuk ; Hong, Hyunki ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 167~174
DOI : 10.5573/ieek.2013.50.7.167
Various smart phone applications have been widely developed and an intelligent service to take a picture for the visually handicapped is needed. By using an auditory service and/or other's help, the blind capture an image with their cameras for keeping a record or exchanging the information with another people. However, they are difficult to take the wanted picture because they are unable to grasp the visual contents in the viewfinder. This paper presents a novel guiding system for the blind people to take a picture with the smart phone. The proposed method identifies a person in the picture and determines the presence of eye blinks and blurring. The system provides a guiding information such as camera directions, which are transferred into the blind user with auditory service.
Traitor Traceability of Colluded Multimedia Fingerprinting code Using Hamming Distance on XOR Collusion Attack
Chung, Il Yong ; Rhee, Kang Hyeon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 175~180
DOI : 10.5573/ieek.2013.50.7.175
For the traitor tracing of multimedia content, this paper presents the classification algorithm of XOR collusion attack types using hamming distance, which applies to the colluded fingerprinting codes. The conventional traitor decision hinges on the colluded fingerprinting code used by a correlation coefficient, but the proposed scheme uses hamming distance. While XOR collusion attack employing a correlation coefficient is impossible to trace the traitors about 50% colluders due to a serious XOR linear problem, our method improves the performance of traceability to trace at least 1 traitor using hamming distance, and thus, the functional behavior of the proposed traitor traceability is coincided with Probability Scheme.
An Interpolation Method for a Barrel Distortion Using Nearest Pixels on a Corrected Image
Choi, Changwon ; Yi, Joonhwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 181~190
DOI : 10.5573/ieek.2013.50.7.181
We propose an interpolation method considering barrel distortion of fisheye lens using nearest pixels on a corrected image. The correction of barrel distortion comprises coordinate transformation and interpolation. This paper focuses on interpolation. The proposed interpolation method uses nearest four coordinates on a corrected image rather than on a distorted image unlike existing techniques. Experimental results show that both subjective and objective image qualities are improved.
Geomulticast: Location based Multicast Routing Protocol using Route Stability in Mobile Ad-hoc Wireless Networks
Ha, Sue Hyung ; Le, The Dung ; An, Beongku ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 191~201
DOI : 10.5573/ieek.2013.50.7.191
In this paper, we propose a location based multicast routing protocol, called Geomulticast, in mobile ad-hoc wireless networks. The main features and contributions of the proposed geomulticast are as follows. First, support data transmission to only the specific mobile nodes within a target area. Second, establish stable routing route by using mobility information of nodes. Third, reduce control overhead, power for construction of routing route by using geomulticast guided line information. Fourth, present a theoretical model for establishing stable route. The performance evaluation of the proposed geomulticast is executed by using OPNET simulation and theoretical analysis, and the results of simulation and theoretical analysis have similar patterns. And we can see that data packets are efficiently transmitted to specific user groups within a specific area.
A Deblurring Algorithm Combined with Edge Directional Color Demosaicing for Reducing Interpolation Artifacts
Yoo, Du Sic ; Song, Ki Sun ; Kang, Moon Gi ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 205~215
DOI : 10.5573/ieek.2013.50.7.205
In digital imaging system, Bayer pattern is widely used and the observed image is degraded by optical blur during image acquisition process. Generally, demosaicing and deblurring process are separately performed in order to convert a blurred Bayer image to a high resolution color image. However, the demosaicing process often generates visible artifacts such as zipper effect and Moire artifacts when performing interpolation across edge direction in Bayer pattern image. These artifacts are emphasized by the deblurring process. In order to solve this problem, this paper proposes a deblurring algorithm combined with edge directional color demosaicing method. The proposed method is consisted of interpolation step and region classification step. Interpolation and deblurring are simultaneously performed according to horizontal and vertical directions, respectively during the interpolation step. In the region classification step, characteristics of local regions are determined at each pixel position and the directionally obtained values are region adaptively fused. Also, the proposed method uses blur model based on wave optics and deblurring filter is calculated by using estimated characteristics of local regions. The simulation results show that the proposed deblurring algorithm prevents the boosting of artifacts and outperforms conventional approaches in both objective and subjective terms.
Image Thresholding Based on Within-Class Standard Deviation
Sung, Jung-Min ; Ha, Ho-Gun ; Choi, Bong-Yeol ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 216~224
DOI : 10.5573/ieek.2013.50.7.216
The within-class variance of Otsu's method is moderate but improper in expressing class statistical distributions. Otsu's method uses a variance to represent the distribution of each class. The variance utilizes a distance square from the mean to a data. This process is not proper in denoting a real class statistical distribution because of the distance square. In this paper, to express more exact class statistical distributions, the within-class standard deviation as a criterion for threshold selection is proposed and then the optimal threshold is determined by minimizing it. In order to have validity, it is shown through the experimental results that the proposed method was more superior to the counterparts.
The Multiband Interpolant Filter in the Second-order BPS System
Kim, Hyuk ; Baek, Jein ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 225~230
DOI : 10.5573/ieek.2013.50.7.225
In a bandpass sampling (BPS), the frequency of the sampler is lower than that of the signal being sampled. In this method, the baseband spectrum directly appears by the sampling operation, so that it is not necessary to use any frequency down-converter, which makes the receiver's hardware simpler. The second-order BPS uses two identical BPS samplers, of which sampling times are offset by each other. By exploiting the relationship between two sampled signals, it can be possible to cancel the aliased signal component or the interference due to the bandpass sampling. In order to cancel the interference, an interpolant filter is used to manipulate the phase characteristics of the BPS sampled signal. In this paper, it is introduced a multiband interpolant filter which can simultaneously cancel multiple interference signals that have been aliased from multiple frequency bands. In case of no need of interference cancellation, another method is suggested to enhance the signal quality by 3dB. A computer simulation has been performed, and the feasibility of the suggested methods has been verified.
Lens Distortion Correction of images with Gradient Components
Park, Junhee ; Lee, Byung-Uk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 231~235
DOI : 10.5573/ieek.2013.50.7.231
Lens distortions have a significant impact on captured or projected image geometry. This paper proposes a lens distortion correction with gradient components for wide-angle lenses. In most cases, distortion coefficients are estimated using a distortion model by point correspondences. Corrected images using only point correspondences can be compensated excessively, therefore, producing bended lines into the opposite direction near the corners. To curtail these phenomena, we propose to adopt the gradient components in addition to positions to obtain the distortion coefficients. We verified the improved accuracy and the straightness of the proposed method through experimentation.
Output Feedback Control for Nonlinear System with Time Delay
Lee, Sungryul ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 239~243
DOI : 10.5573/ieek.2013.50.7.239
This paper presents the output feedback control design for triangular nonlinear systems with input delay. The proposed controller is composed of a high gain observer and a linear controller. It is shown that by using Lyapunov-Krasovskii theorem, the proposed controller ensures an asymptotic stability for sufficiently small input delay. Finally, an illustrative example is given in order to show the effectiveness of our design method.
Power-based Supervisory Control of Discrete Event Systems: Political Economy Analysis
Park, Seong-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 244~252
DOI : 10.5573/ieek.2013.50.7.244
In this paper, we show that supervisory control theory of discrete event systems can be applied to analyze the problem of power in political economy. For this purpose, we introduce the decision mechanism of control inputs based on power, and the consequent behavior of a supervised system. Specifically, this paper presents the notion of power-controllability as a necessary and sufficient condition to achieve a common control objective of competing groups (local controllers). If the power-controllability is met, a modular system controlled by local controllers with power functions is not deviated from a common control objective of them.
Robust Observer for Nonlinear Systems with Delayed Output
Lee, Sungryul ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 253~257
DOI : 10.5573/ieek.2013.50.7.253
This paper proposes the robust observer design for nonlinear systems with delayed output and external disturbance. It is shown that by considering a nonlinear term of error dynamics as an additional state variable, the nonlinear error dynamics with time delay can be transformed into the linear one with time delay. Sufficient conditions for existence of a robust observer are characterized by linear matrix inequalities. Finally, an illustrative example is given in order to show the effectiveness of our design method.
Target Detection Algorithm Based on Seismic Sensor for Adaptation of Background Noise
Lee, Jaeil ; Lee, Chong Hyun ; Bae, Jinho ; Kwon, Jihoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 258~266
DOI : 10.5573/ieek.2013.50.7.258
We propose adaptive detection algorithm to reduce a false alarm by considering the characteristics of the random noise on the detection system based on a seismic sensor. The proposed algorithm consists of the first step detection using kernel function and the second step detection using detection classes. Kernel function of the first step detection is obtained from the threshold of the Neyman-Pearon decision criterion using the probability density functions varied along the noise from the measured signal. The second step detector consists of 4 step detection class by calculating the occupancy time of the footstep using the first detected samples. In order to verify performance of the proposed algorithm, the detection of the footsteps using measured signal of targets (walking and running) are performed experimentally. The detection results are compared with a fixed threshold detector. The first step detection result has the high detection performance of 95% up to 10m area. Also, the false alarm probability is decreased from 40% to 20% when it is compared with the fixed threshold detector. By applying the detection class(second step detector), it is greatly reduced to less than 4%.
The PWM Control Which used Microprocessor for Intensity Control of Acid Ion Water
Kwon, Yunjung ; Nam, Sangyep ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 269~274
DOI : 10.5573/ieek.2013.50.7.269
We are used with the alkaline ion water which an application field does to object for drinking water compare with the alkaline ion water which asked ion acid electrolysis so as to be very different. This is used with sterilization disinfection use by residual chlorine in case of strong acidity according to ph intensity, and in case of middle acidity use by washing and face washing, and mix with meal materials in case of weak acidity widely usable in cooking. Acid ion water generates as we electrolyze water. Chlorine gas and sodium hydroxide etc. was generated at electrolysis process, and we have toward sterilizing power. Derelicts such as chlorine, phosphorus, sulfur etc. are gathered from a negative ion, and we make acid ion water to + electrode direction in electrolysis. We used a diaphragm in order to disconnect too acid water and alkaline water. We implemented so that the acid water which it came down to three kinds of PWM voltage to PWM (pulse width modulation) control, and implementation method of ph intensity change authorized ph intensity between weak acidity to electrode in strong acidity as we used Microprocessor, and intensity was adjusted successively by PWM control was generated.
Optimizing Method for Wireless Charging with Frequency Control
Ahn, Tae-Won ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 275~280
DOI : 10.5573/ieek.2013.50.7.275
This paper presents an optimizing method for wireless charging system, specifically focused on the capsule endoscope applications. In order to increase the wireless power transfer efficiency of electro-magnetic resonance coupled coils, this paper investigates the impact factors of the power transfer efficiency in small battery capacity system and proposes a efficiency optimizing method based on frequency control. Simulation results show that the proposed efficiency optimal control method can effectively stabilize the wireless power transfer efficiency so as to successfully solve the main issue of transfer efficiency variation with distance and as well as parasitic element.
A Comparison of DC-DC Buck Converter Controller
Kang, Min Gu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 281~285
DOI : 10.5573/ieek.2013.50.7.281
Transfer function of Buk DC-DC converter is derived using Laplace transformed LC filter. Using root locus and simulation waveform, this paper shows that Type2 controller proposed in reference has poor performance. Using root locus PI controller has designed. Using operational amp, PI controller is realized. Properly operated Type2 controller is proposed and proved using simulation result.
Characteristics and Analysis of CATV Home Networks
Park, Sung-Wook ; Park, Jong-Kwan ; Ohm, Woo-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 286~291
DOI : 10.5573/ieek.2013.50.7.286
Home CATV networks comprise coaxial cables and signal splitters which have less than ideal characteristics. Home network testing facilities use long lengths of coaxial cables, often undesirably coiling and bending the cable, stressing joints on connectors. Cable connectors, cable placement, bending and flexing can cause leakage of signals and can result in undesired signal paths in a system causing deteriorated performance. The purpose of this paper is to bring to light the issues of signal leakage and radiation from shielded media such as RG-59 and RG-6 coaxial cables, furthermore signal splitters have less than ideal characteristics.
Development of a Bi-directional Data Transmission System Using UWB Technology Over Coax
Park, Sung-Wook ; Ohm, Woo-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 7, 2013, Pages 292~299
DOI : 10.5573/ieek.2013.50.7.292
In this paper, we developed a data transmission system over coaxial cable based on the IEEE 802.15.3 MAC and Ultra-Wideband(UWB) Physical Layer. This system is capable of operation in both wireless and wired medias. When operating on coax cable it is capable of Gigabit bi-directional data rate operation on in-home coax wiring and over Hybrid-Fiber-Coax(HFC) cable infrastructure. The developed system transceives command, control and data over a 75 ohm coax system in a home or office. This system operates at a center frequency of 4GHz with a total occupied bandwidth of 1.33Ghz centered on 4GHz. The system uses BPSK modulation and sends symbols at a maximum power level of +15dBm. It has been tested and works through up to three CATV RF splitters in a home environment.