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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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Polar Quantum Channel Coding for Symmetric Capacity Achieving
Yang, Jae Seung ; Park, Ju Yong ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 3~14
DOI : 10.5573/ieek.2013.50.8.003
We demonstrate a fashion of quantum channel combining and splitting, called polar quantum channel coding, to generate a quantum bit (qubit) sequence that achieves the symmetric capacity for any given binary input discrete quantum channels. The present capacity is achievable subject to input of arbitrary qubits with equal probability. The polarizing quantum channels can be well-conditioned for quantum error-correction coding, which transmits partially quantum data through some channels at rate one with the symmetric capacity near one but at rate zero through others.
Frequency Offset Reduction scheme using Dual-band FSK Modulation for Narrowband communications
Lee, Yongwook ; Kang, Donghoon ; Oh, Wangrok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 15~20
DOI : 10.5573/ieek.2013.50.8.015
In narrowband communication systems operating in VHF and UHF bands, the performance degradation due to a frequency offset is inevitable. In this paper, we propose a frequency offset reduction scheme using the dual-band FSK modulation for narrowband communications. The proposed scheme not only offer a relatively reliable performance under a severe frequency offsets, but also can obtain a frequency diversity gain in Rayleigh fading channel.
A Low-Complexity Turbo coded BICM-ID System
Kang, Donghoon ; Lee, Yongwook ; Oh, Wangrok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 21~27
DOI : 10.5573/ieek.2013.50.8.021
In this paper, we propose a low-complexity Turbo coded BICM-ID (bit-interleaved coded modulation with iterative decoding) system. A Turbo code is a powerful error correcting code with a BER (bit error rate) performance very close to the Shannon limit. In order to increase spectral efficiency of the Turbo code, a coded modulation combining Turbo code with high order modulation is used. The BER performance of Turbo-BICM can be improved by Turbo-BICM-ID using iterative demodulation and decoding algorithm. However, compared with Turbo-BICM, the decoding complexity of Turbo-BICM-ID is increased by exchanging information between decoder and demodulator. To reduce the decoding complexity of Turbo-BICM-ID, we propose a low-complexity Turbo-BICM-ID system. When compared with conventional Turbo-BICM-ID, the proposed scheme not only show similar BER performance but also reduce the decoding complexity.
Design and Performance Evaluation of Improved Turbo Equalizer
An, Changyoung ; Ryu, Heung-Gyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 28~38
DOI : 10.5573/ieek.2013.50.8.028
In this paper, we propose a improved turbo equalizer which generates a feedback signal through a simple calculation to improve performance in single carrier system with the LMS(least mean square) algorithm based equalizer and LDPC(low density parity check) codes. LDPC codes can approach the Shannon limit performance closely. However, computational complexity of LDPC codes is greatly increased by increasing the repetition of the LDPC codes and using a long parity check matrix in harsh environments. Turbo equalization based on LDPC code is used for improvement of system performance. In this system, there is a disadvantage of very large amount of computation due to the increase of the repetition number. To less down the amount of this complicated calculation, The proposed improved turbo equalizer adjusts the adoptive equalizer after the soft decision and the LDPC code. Through the simulation results, it's confirmed that performance of improved turbo equalizer is close to the SISO-MMSE(soft input soft output minimum mean square error) turbo equalizer based on LDPC code with the smaller amount of calculation.
Interference Management with Cell Selection using Cell Range Expansion and ABS in Heterogeneous Network based on LTE-Advanced
Moon, Sangmi ; Kim, Bora ; Malik, Saransh ; Kim, Daejin ; Hwang, Intae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 39~44
DOI : 10.5573/ieek.2013.50.8.039
Long Term Evolution (LTE) - Advanced has developed Heterogeneous Network (HetNet) that consists of a mix of macrocells and low-power nodes such as picocells to improve the system performance. Also, to encourage data offloading in HetNet, Cell Range Expansion (CRE) have been introduced. In this paper, we propose a cell selection scheme based on Signal to Interference plus Noise Ratio (SINR) for optimal offloading effect. And we manage the interference for user located in cell range expanded region using Almost Blank Subframe (ABS) with flexible ABS ratio to improve the spectrum efficiency in time domain. Simulation results show that proposed scheme can improve spectrum efficiency of macrocell and picocell user. Eventually, proposed scheme can imporve overall user performance.
Performance Analysis of CoMP with Scheduling and Precoding Techniques in the HetNet System
Kim, Bora ; Moon, Sangmi ; Malik, Saransh ; Kim, Cheolsung ; Hwang, Intae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 45~52
DOI : 10.5573/ieek.2013.50.8.045
Coordinated Multi-Point (CoMP) is considered as a technology in the 3rd Generation Partnership Project(3GPP) Long Term Evolution-Advanced (LTE-A) system. In this paper, we design and analyze the performance of the Coordinated Beamforming (CB) technique, which is one major category of CoMP. We perform Monte Carlo simulations with a Heterogeneous Network (HetNet) in LTE-A, and confirm the performance through a graph of the Cumulative Distribution Function (CDF). From the simulation results, we show significant performance gain with the CoMP technique, and better performance when we apply various schemes of scheduling and precoding.
Performance of MIMO MC-CDMA systems combining multi-beamforming algorithm with space-time coding
Kim, Chan Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 53~60
DOI : 10.5573/ieek.2013.50.8.053
In this paper, the new multi-beamforming is proposed for Multiple-input multiple-output (MIMO) Multicarrier-Code division multiple access(MC-CDMA) systems to overcome the decrease of performance due to multiuser interference and multiple-antenna interference. Installing the number of multi-beamformer which is equal to the number of multi-transmitter antennas and exploiting the proposed approach at the receiver of MIMO MC-CDMA, the multi-beams are formed toward each multi-antenna of desired user and null beam are formed to other interference. Therefore, the performance of MIMO MC-CDMA system is improved as removing the interference signal. BER performance improvement is investigated through computer simulation by the proposed approach to MIMO MC-CDMA system.
Iterative MIMO Reception Based on Low Complexity Soft Detection
Shin, Sang-Sik ; Choi, Ji-Woong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 61~66
DOI : 10.5573/ieek.2013.50.8.061
In this paper, we propose an iterative soft dimension reduction based multi-input multi-output (MIMO) detection for coded spatial multiplexing system. In spite of better performance of iterative MIMO detection, its computational complexity gives a significant burden to the receivers. To mitigate this problem, we propose a scheme employing all ordering successive interference cancellation (AOSIC) for hard-decision detection and dimension reduction soft demodulator (DRSD) with iterative decoding for soft-decision detectors, respectively. This scheme can reduce complexity of iterative soft MIMO detection and provide better performance than other conventional detectors.
A Linear Program Based Heuristic for the Bit and Subchannel Allocation in an OFDM System
Moon, Woosik ; Kim, Sunho ; Park, Taehyung ; Im, Sungbin ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 67~75
DOI : 10.5573/ieek.2013.50.8.067
The advantages of the orthogonal frequency division multiplexing (OFDM) are high spectral efficiency, resiliency to RF interference, and lower multi-path distortion. To further utilize vast channel capacity of the multiuser OFDM, one has to find the efficient adaptive subchannel and bit allocation among users. In this paper, we compare the performance of the linear programming dual of the 0-1 integer programming formulation with the existing convex optimization approach for the optimal subchannel and bit allocation problem of the multiuser OFDM. Utilizing tight lower bound provided by the LP dual formulation, we develop a primal heurisitc algorithm based on the LP dual solution. The performance of the primal heuristic is compared with MAO, ESA heuristic solutions, and integer programming solution on MATLAB simulation on a system employing M-ary quadrature amplitude modulation (MQAM) assuming a frequency-selective channel consisting of three independent Rayleigh multi-paths.
Performance Evaluation of The Weighted TR Prefilter with Channel Estimation Error in An Indoor Wireless Communication Environment
Yoon, Misun ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 76~82
DOI : 10.5573/ieek.2013.50.8.076
We evaluate the performance of the time-reversal (TR) prefilter and the weighted TR prefilter in an indoor wireless communication system with channel estimation errors. The TR prefilter uses a time-reversed channel as a prefilter to maximize received peak power. The equivalent channel of the TR prefilter is an 공분산 of the channel and the received peak power is maximized. When there are channel estimation errors, the equivalent channel is not an 공분산 of the channel and the received peak power cannot be maximized. The weighted TR prefilter minimizes the inter-symbol interference and maintains the received peak power. Thus, even when there are some channel estimation errors, the weighted TR prefilter can guarantee the received peak power.
Encounter of Lattice-type coding with Wiener's MMSE and Shannon's Information-Theoretic Capacity Limits in Quantity and Quality of Signal Transmission
Park, Daechul ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 83~93
DOI : 10.5573/ieek.2013.50.8.083
By comparing Wiener's MMSE on stochastic signal transmission with Shannon's mutual information first proved by C.E. Shannon in terms of information theory, connections between two approaches were investigated. What Wiener wanted to see in signal transmission in noisy channel is to try to capture fundamental limits for signal quality in signal estimation. On the other hands, Shannon was interested in finding fundamental limits of signal quantity that maximize the uncertainty in mutual information using the entropy concept in noisy channel. First concern of this paper is to show that in deriving limits of Shannon's point to point fundamental channel capacity, Shannon's mutual information obtained by exploiting MMSE combiner and Wiener filter's MMSE are interelated by integro-differential equantion. Then, At the meeting point of Wiener's MMSE and Shannon's mutual information the upper bound of spectral efficiency and the lower bound of energy efficiency were computed. Choosing a proper lattice-type code of a mod-
AWGN channel model and MMSE estimation of
confirmed to lead to the fundamental Shannon capacity limits.
The Mirror Active Element Pattern Method for The Radiation Pattern Computation of Linear Array Antennas
Kim, Jae-Hyun ; Yoon, Young-Min ; Kim, Boo-Gyoun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 94~102
DOI : 10.5573/ieek.2013.50.8.094
We propose the mirror active element pattern (AEP) method for the radiation pattern computation of linear array antennas versus scan angles. The computation time for the radiation pattern of linear array antennas using the mirror AEP method is reduced by almost half compared to that using the AEP method because the number of AEPs of elements obtained by the full-wave simulation necessary for the radiation pattern computation of linear array antennas is reduced by almost half. The difference between the radiation patterns of linear array antennas obtained by the full-wave simulation and mirror AEP method is very small for wide scan angle range when the radiation pattern of an antenna element is symmetric.
Cluster Reconfiguration Protocol in Anonymous Cluster-Based MANETs
Park, YoHan ; Park, YoungHo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 103~109
DOI : 10.5573/ieek.2013.50.8.103
Mobile ad hoc networks (MANETs) are infrastructure-less and stand-alone wireless networks with dynamic topologies. To support user's safety in MANETs, fundamental and various security services should be supported. Especially in mobile commercial market, one of the major concerns regarding security is user privacy. Recently, researches about security system to protect user privacy in cluster-based MANETs have been introduced. This paper propose a cluster reconfiguration protocol under anonymous cluster-based MANETs to enhance the network stability. The improved anonymous cluster-based MANETs can recover the network structure against abnormal states of clutserheads.
Development of DSSS Uplink System for Missile Remote Control
Lee, Sangbum ; Choi, Seoungduck ; Kim, Whanwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 110~118
DOI : 10.5573/ieek.2013.50.8.110
This paper describes the development of DSSS wireless communication uplink system for missile remote control. In consideration of low probability of intercept, low probability of exploitation, anti-jam, low latency, and doppler frequency offset, we used DSSS partially DBPSK. Also we used the selective diversity with two receiving antennas to mitigate multipath interference which is the dominant channel impairment and the turbo product code(TPC) for forward error correction(FEC) to improve bit error rate performance.
Design of Radiation Hardened Shift Register and SEU Measurement and Evaluation using The Proton
Kang, Geun Hun ; Roh, Young Tak ; Lee, Hee Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 121~127
DOI : 10.5573/ieek.2013.50.8.121
Memory devices including SRAM and DRAM are very susceptible to high energy radiation particles in the space. Abnormal operation of the devices is caused by SEE or TID. This paper presents a method to estimate proton SEU cross section representing the susceptibility of the latch circuit that the unit cell of the SRAM and proposes a new latch circuit to mitigate the SEU. 50b shift register was fabricated by using the conventional latch and the proposed latch in
process. Irradiation experiment was conducted at KIRAMS by using 43MeV proton beam. It was found that the proposed latch-shift register is not affected by the radiation environment compared to the conventional latch-shift register.
Design of the Power-LED Driver for High Speed Dimming Control
Lee, Keon ; Kang, Woo-Seong ; Jung, Tae-Jin ; Yoon, Kwang-Sub ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 128~135
DOI : 10.5573/ieek.2013.50.8.128
This paper presents a high dimming ratio Power-LED driver IC with high power which is capable of controlling LEDs. In order to accomplish a high dimming ratio LED driver, the preloading inductor current methodology is proposed for the power stage of the proposed method to achieve the fast transient response time during the Power-LED load switching. The information containing the current flowing on the LEDs can be utilized to predict the amount of the current on the inductor. The minimum LED current rising time of existing high dimming ratio Power-LED driver is limited by
, however that of the proposed high dimming ratio Power-LED driver is reduced about 1/10. The LED driver is implemented with 0.35um 60V BCDMOS 2-poly 4-metal process. The measurement results show that the proposed LED driver system features the minimum rising time as small as 240ns at the dimming frequency of 1KHz with a 12V of input voltage, nine white LEDs and 353mA of LED current. The LED rising time and power conversion efficiency of the chip are measured to be 240ns and 93.72%, respectively.
Matrix type CRC and XOR/XNOR for high-speed operation in DDR4 and GDDR5
Lee, JoongHo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 136~142
DOI : 10.5573/ieek.2013.50.8.136
CRC features have been added to increase the reliability of the data in memory products for high-speed operation, such as DDR4. High-speed memory products in a shortage of internal timing margin increases for the CRC calculation. Because the existing CRC requires many additional circuit area and delay time. In this paper, we show that the matrix-type CRC and a new XOR/XNOR gate could be improved the circuit area and delay time. Proposed matrix-type CRC can detect all odd-bit errors and can detect even number of bit errors, except for multiples of four bits. In addition, a single error in the error correction can reduce the burden of re-transmission of data between memory products and systems due to CRC errors. In addition, the additional circuit area, compared to existing methods can be improved by 57%. The proposed XOR gate which is consists of six transistors, it can reduce the area overhead of 35% compared to the existing CRC, 50% of the gate delay can be reduced.
A Cache buffer and Read Request-aware Request Scheduling Method for NAND flash-based Solid-state Disks
Bang, Kwanhu ; Park, Sang-Hoon ; Lee, Hyuk-Jun ; Chung, Eui-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 143~150
DOI : 10.5573/ieek.2013.50.8.143
Solid-state disks (SSDs) have been widely used by high-performance personal computers or servers due to its good characteristics and performance. The NAND flash-based SSDs, which take large portion of the whole NAND flash market, are the major type of SSDs. They usually integrate a cache buffer which is built from DRAM and uses the write-back policy for better performance. Unfortunately, the policy makes existing scheduling methods less effective at the I/F level of SSDs Therefore, in this paper, we propose a scheduling method for the I/F with consideration of the cache buffer. The proposed method considers the hit/miss status of cache buffer and gives higher priority to the read requests. As a result, the requests whose data is hit on the cache buffer can be handled in advance and the read requests which have larger effects on the whole system performance than write requests experience shorter latency. The experimental results show that the proposed scheduling method improves read latency by 26%.
A Continuous Conduction mode/Critical Conduction Mode Active Power Factor Correction Circuit with Input Voltage Sensor-less Control
Roh, Yong-Seong ; Yoo, Changsik ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 151~161
DOI : 10.5573/ieek.2013.50.8.151
An active power factor correction (PFC) circuit is presented which employs a newly proposed input voltage sensor-less control technique operated in continuous conduction mode (CCM) and critical conduction mode (CRM). The conventional PFC circuit with input voltage sensor-less control technique degrades the power factor (PF) under the light load condition due to DCM operation. In the proposed PFC circuit, the switching frequency is basically 70KHz in CCM operation. In light load condition, however, the PFC circuit operates in CRM and the switching frequency is increased up to 200KHz. So CCM/CRM operation of the PFC circuit alleviates the decreasing of the PF in light load condition. The proposed PFC controller IC has been implemented in a
BCDMOS process and a 240W PFC prototype is built. Experimental results shows the PF of the proposed PFC circuit is improved up to 10% from the one employing the conventional CCM/DCM dual mode control technique. Also, the PF is improved up to 4% in the light load condition of the IEC 61000-3-2 Class D specifications.
Implementation of Efficient Pile-up Pulse Processing Algorithm Based on Trapezoidal Filter
Piao, Zheyan ; Chung, Jin-Gyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 162~167
DOI : 10.5573/ieek.2013.50.8.162
-ray spectroscopy systems are widely used for analyzing material characteristics. Pile-up pulses are very often encountered for several reasons in XRF systems. Thus, it is necessary to reject or recover pile-up pulses to accurately analyze the material under test. In this paper, a pile up pulse rejection and recovery method is presented for XRF systems using trapezoidal pulse shaping of the input signals. Since the proposed method is based on the trapezoidal pulse shaping method widely-used in XRF systems, only two counters and a few registers are needed to implement the additional function of pile-up pulse rejection and recovery. Consequently, the proposed system is much simpler than conventional pulse reconstruction systems. It is shown that the proposed method can detect and reject pile-up pulses exactly. It is also shown that the pile-up pulses can be recovered if some conditions are satisfied.
Searching a Navigation Path to Avoid Danger Area for Safe Driving
Lee, Yong-Hu ; Kim, Sang-Woon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 171~179
DOI : 10.5573/ieek.2013.50.8.171
The primary function of navigation system is to provide route search and road guidance for safe driving for drivers. However, the existing route search system provides a simple service that looks up the shortest route using a safe driving DB without considering different road characteristics for the safety of the drivers. In order to maintain the safe driving, rather than searching the shortest path, a navigation system, in which the danger areas and/or the dangerous time zones have been considered, is required. Therefore, in this paper we propose a strategy of searching a navigation path to avoid danger areas for safe driving by using the A* algorithm. In the strategy, when evaluating the path-specific fitness of the navigation nodes, different heuristic weights were assigned to different types of risk areas. In particular, we considered three kinds of danger areas, such as accident-prone sections where accidents occur frequently, school zones, and intersection regions, as well as the time slots when the probability of danger is high. From computer simulation, the results demonstrate that the proposed scheme can provide the way to avoid danger areas on the route searching and confirm the possibility of providing the actual service.
Data Hiding using Improving Hamming Code
Kim, Cheonshik ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 180~186
DOI : 10.5573/ieek.2013.50.8.180
The primary goal of attack on steganographic images, termed steganalysis, is to detect the presence of hidden data by finding statistical abnormality of a stego-media caused by data embedding. This paper proposes a novel steganographic scheme based on improving the (7, 4) Hamming code for digital images. The proposed scheme embeds a segment of six secret bits into a group of nine cover pixels at a time. The experimental results show that the proposed scheme achieves a 0.67bpp embedding payload and a slightly higher visual quality of stego images compared with the previous arts.
Learning-based Detection of License Plate using SIFT and Neural Network
Hong, Won Ju ; Kim, Min Woo ; Oh, Il-Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 187~195
DOI : 10.5573/ieek.2013.50.8.187
Most of former studies for car license plate detection restrict the image acquisition environment. The aim of this research is to diminish the restrictions by proposing a new method of using SIFT and neural network. SIFT can be used in diverse situations with less restriction because it provides size- and rotation-invariance and large discriminating power. SIFT extracted from the license plate image is divided into the internal(inside class) and the external(outside class) ones and the classifier is trained using them. In the proposed method, by just putting the various types of license plates, the trained neural network classifier can process all of the types. Although the classification performance is not high, the inside class appears densely over the plate region and sparsely over the non-plate regions. These characteristics create a local feature map, from which we can identify the location with the global maximum value as a candidate of license plate region. We collected image database with much less restriction than the conventional researches. The experiment and evaluation were done using this database. In terms of classification accuracy of SIFT keypoints, the correct recognition rate was 97.1%. The precision rate was 62.0% and recall rate was 50.2%. In terms of license plate detection rate, the correct recognition rate was 98.6%.
A Diagnosis Method of Basal Cell Carcinoma by Raman Spectra of Skin Tissue using NMF Algorithm
Park, Aaron ; Baek, Sung-June ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 196~202
DOI : 10.5573/ieek.2013.50.8.196
Basal cell carcinoma (BCC) is the most common skin cancer and its incidence is increasing rapidly. In this paper, we propose a diagnosis method of basal cell carcinoma by Raman spectra of skin tissue using the NMF(non-negative matrix factorization) algorithm. After preprocessing steps, measured Raman spectra is used classification experiments. The weight and the basis can be obtained in a simple matrix operation and a column vector of the matrix decompsed by the NMF. Linear combination of bases and weights, it is possible to approximate the average of Raman spectra. The classification method is to select the class which to minimize the root mean square of the difference of the linear combination and the objective spectrum. According to the experimental results, the proposed method shows the promising results to diagnosis BCC. In addition, it confirmed that the proposed method compared with the previous research result could be effectively applied in the analysis of the Raman spectra.
The Implementation and Performance Measurement for Hadoop-Based Android Mobile TPC-C Application
Jang, Han-Uer ; No, Jaechun ; Kim, Byung-Moon ; Lee, Ji-Eun ; Park, Sung-Soon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 203~211
DOI : 10.5573/ieek.2013.50.8.203
Due to the rapid growth of mobile devices and applications, mobile cloud computing is becoming an important platform in the development of cloud services. However, the mobile cloud computing is facing many challenges in terms of the computing resources and communications. One of them is the performance issue between mobile devices and cloud server. In the paper, we implemented a hadoop-based android mobile application, called mobile TPC-C, and used it for evaluating the performance aspect between mobile devices and cloud server. The mobile TPC-C was implemented based on the existing TPC-C, to make it possible to execute on top of android mobile devices. The performance measurement using mobile TPC-C was executed on various transactions while changing the number of mobile clients. By comparing it to the evaluation on the personal PC, we tried to point out the important aspects affecting the performance improvement between mobile clients and cloud server.
Efficient Homography Estimation for Panoramic Image Generation
Seo, Sangwon ; Joeng, Soowoong ; Han, Yunsang ; Choi, Jongsoo ; Lee, Sangkeun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 215~224
DOI : 10.5573/ieek.2013.50.8.215
An efficient homography estimation method for large sized images is proposed. Estimating an accurate homography is one of the most important parts in image stitching processes. Since hardwares have been advanced, it has been passible to take higher resolution images. However, computational cost for estimating homography has been also increased. Specifically, when too many features exist in the images, it requires lots of computations to estimate a correct homography. Furthermore, there is a high probability of obtaining an incorrect homography. Therefore, we propose a numerical method to extract the appropriate correspondences from several down-scaled images to estimate and compensate the homography numerically for restoring an original homography. Also, if there is an unbalance in color tone between the reference and the target images, we make them balanced by using local information of the overlapped regions. Experimental results show that proposed method is three times faster in 3.2 mega pixel images, five times faster in 8mega pixel images than the conventional approach. Therefore, we believe that the proposed method can be a useful tool to efficiently estimate a homography.
Improvement Segmentation Method of Medical Images using Volume Data
Chae, Seung-Hoon ; Pan, Sung Bum ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 225~231
DOI : 10.5573/ieek.2013.50.8.225
Medical image segmentation is an image processing technology prior to performing various medical image processing. Therefore, a variety of methods have been researched for fast and accurate medical image segmentation. Accurate judgment of segmentation region is needed to segment the interest region in which patient requested in medical image that various organs exist. However, an case that scanned a part of organs is small occurs. In this case, information to determine the segmentation region is lack. consequently, a removal of segmentation region occurs during the segmentation process. In this paper, we improved segmentation results in a small region using volume data and linear equation. In order to verify the performance of the proposed method, we segmented the lung region of chest CT images. As a result of experiments, we confirmed that image segmentation accuracy rose from 0.978 to 0.981 and standard deviation also improved from 0.281 to 0.187.
Video Based Fall Detection Algorithm Using Hidden Markov Model
Kim, Nam Ho ; Yu, Yun Seop ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 232~237
DOI : 10.5573/ieek.2013.50.8.232
A newly developed fall detection algorithm using the HMM (Hidden Markov Model) extracted from the video is introduced. To distinguish between the fall from personal difference fall pattern or the normal activities of daily living (ADL), HMM machine learning algorithm is used. For getting fall feature vector of video, the motion vector from the optical flow is applied to the PCA (Principal Component Analysis). The combination of the angle, ratio of long-short axis, velocity from results of PCA make the new fall feature parameters. These parameters were applied to the HMM and the results were compared and analyzed. Among the newly proposed various kinds of fall parameters, the angle of movement showed the best results. The results show that this parameter can distinguish various types of fall from ADLs with 91.5% sensitivity and 88.01% specificity.
An Efficient Background Modeling and Correction Method for EDXRF Spectra
Park, Dong Sun ; Jagadeesan, Sukanya ; Jin, Moonyong ; Yoon, Sook ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 238~244
DOI : 10.5573/ieek.2013.50.8.238
In energy dispersive X-ray fluorescence analysis, the removal of the continuum on which the X-ray spectrum is superimposed is one of the most important processes, since it has a strong influence on the analysis result. The existing methods which have been used for it usually require tight constraints or prior information on the continuum. In this paper, an efficient background correction method is proposed for Energy Dispersive X-ray fluorescence (EDXRF) spectra. The proposed method has two steps of background modeling and background correction. It is based on the basic concept which differentiates background areas from the peak areas in a spectrum and the SNIP algorithm, one of the popular methods for background removal, is used to enhance the performance. After detecting some points which belong to the background from a spectrum, its background is modeled by a curve fitting method based on them. And then the obtained background model is subtracted from the raw spectrum. The method has been shown to give better results than some of traditional methods, while working under relatively weak constraints or prior information.
Multi-view Rate Control based on HEVC for 3D Video Services
Lim, Woong ; Lee, Sooyoun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 245~249
DOI : 10.5573/ieek.2013.50.8.245
In this paper, we propose two rate control algorithms for multi-view extension of HEVC with two rate control algorithms adopted in HEVC and analyze the multi-view rate control performance. The proposed multi-view rate controls are designed on HEVC-based multi-view video coding (MV-HEVC) platform with consideration of high-level syntax, inter-view prediction, etc. not only for the base view but also for the extended views using the rate control algorithms based on URQ (Unified Rate-Quantization) and R-lambda model adopted in HEVC. The proposed multi-view rate controls also contain view-wise target bit allocation for providing the compatibility to the base view. By allocating the target bitrates for each view, the proposed multi-view rate control based on URQ model achieved about 1.83% of average bitrate accuracy and 1.73dB of average PSNR degradation. In addition, about 2.97% of average bitrate accuracy and 0.31dB of average PSNR degradation are achieved with the proposed multi-view rate control based on R-lambda model.
A Polarization-based Frequency Scanning Interferometer and the Measurement Processing Acceleration based on Parallel Programing
Lee, Seung Hyun ; Kim, Min Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 253~263
DOI : 10.5573/ieek.2013.50.8.253
Frequency Scanning Interferometry(FSI) system, one of the most promising optical surface measurement techniques, generally results in superior optical performance comparing with other 3-dimensional measuring methods as its hardware structure is fixed in operation and only the light frequency is scanned in a specific spectral band without vertical scanning of the target surface or the objective lens. FSI system collects a set of images of interference fringe by changing the frequency of light source. After that, it transforms intensity data of acquired image into frequency information, and calculates the height profile of target objects with the help of frequency analysis based on Fast Fourier Transform(FFT). However, it still suffers from optical noise on target surfaces and relatively long processing time due to the number of images acquired in frequency scanning phase. 1) a Polarization-based Frequency Scanning Interferometry(PFSI) is proposed for optical noise robustness. It consists of tunable laser for light source,
plate in front of reference mirror,
plate in front of target object, polarizing beam splitter, polarizer in front of image sensor, polarizer in front of the fiber coupled light source,
plate between PBS and polarizer of the light source. Using the proposed system, we can solve the problem of fringe image with low contrast by using polarization technique. Also, we can control light distribution of object beam and reference beam. 2) the signal processing acceleration method is proposed for PFSI, based on parallel processing architecture, which consists of parallel processing hardware and software such as Graphic Processing Unit(GPU) and Compute Unified Device Architecture(CUDA). As a result, the processing time reaches into tact time level of real-time processing. Finally, the proposed system is evaluated in terms of accuracy and processing speed through a series of experiment and the obtained results show the effectiveness of the proposed system and method.
Kinematic Modelling of the Trot of a Lizard Based on the Motion Capture
Kim, Chang Hoi ; Shin, Ho Cheol ; Lee, Heung Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 264~273
DOI : 10.5573/ieek.2013.50.8.264
The importance of the robots has emerged as the means of minimizing the casualties in the future war, and, thus, the biomimetic robots mimicking the optimized organisms has been actively studied. The robot inspired lizard is suitable for reconnaissance and the surveillance in narrow areas. In this paper, we analyzed the locomotion of a lizard by motion capture system using the infrared markers. We attached 21 markers to the joints of the lizard. By considering the measured data, we analyzed the walking motion of the lizard which trots in a sprawled posture. Moreover, we proposed the 25 dof kinematic model which was able to reproduce the gait of the lizard faithfully. The model was verified by simulations.
A Study of the Dynamic Performance Improvement of a Linear Compressor Stroke Controller with a Current Control Loop
Oh, Joon-Tae ; Kim, Gyu-Sik ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 274~282
DOI : 10.5573/ieek.2013.50.8.274
In this paper, a linear motor stroke controller using a phase lag filter and a single phase PWM inverter with a current controller has been implemented. In order to control the cooling capability of a refrigerator or an air conditioner in which linear compressors are applied, the piston speed should be controlled. The piston speed control can be obtained by adjusting the frequency or the stroke of linear motors. Generally, the frequency is fixed, for example, as 60Hz and the stroke is adjusted. The dynamic performance of linear compressors depends on how accurately the stroke or the piston position is controlled by the current applied. A linear motor piston position controller with a current control loop is proposed and verified via some simulation studies.
The Characteristics of LLLC in Ultra Thin Silicon Oxides
Kang, C.S. ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 285~291
DOI : 10.5573/ieek.2013.50.8.285
In this paper, MOS-Capacitor and MOSFET devices with a Low Level Leakage Current of oxide thickness, channel width and length respectively were to investigate the reliability characterizations mechanism of ultra thin gate oxide films. These stress induced leakage current means leakage current caused by stress voltage. The low level leakage current in stress and transient current of thin silicon oxide films during and after low voltage has been studied from strss bias condition respectively. The stress channel currents through an oxide measured during application of constant gate voltage and the transient channel currents through the oxide measured after application of constant gate voltage. The study have been the determination of the physical processes taking place in the oxides during the low level leakage current in stress and transient current by stress bias and the use of the knowledge of the physical processes for driving operation reliability.
Synchronization of a Complex Dynamical Network with nonidentical Node and Free Coupling Strength
Yun, Han-O ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 292~298
DOI : 10.5573/ieek.2013.50.8.292
This paper considers synchronization problem of a complex dynamical network with nonidentical nodes. For the problem, the target node is chosen as one of nodes in the complex network instead of an isolate node. Moreover, our synchronization scheme does not need additional conditions and information of coupling matrix comparing with existing works. Based on Lyapunov stability theory, a design criterion for a novel adaptive feedback controller for the synchronization between the target node and another nodes of the complex network is proposed. Finally, the proposed method is applied to a numerical example in orther to show the effectiveness of our results.
A study on the UWB Antenna Design Techniques for Improving Pulse Fidelity
Kim, Jung-Min ; Kang, Eun-Kyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 299~307
DOI : 10.5573/ieek.2013.50.8.299
In this paper, design of UWB Antenna which propagate impulse by pulse fidelity and distortion equation was induced and applied. UWB Antenna which has directional characteristic in UWB band should have low radiation loss and impulse radiation distortion. As a result, the paper designed wide band impedance transformer and microstrip slotline transit region structured antenna feeder line. By using the fabricated UWB antenna, the radiation pattern was measured in the radio anechoic chamber. Pulse fidelity of impulse radiation show good results more than 93% within
Analysis of IR-UWB Tapered Slot Antenna Radiation Pattern using the Group delay and Fidelity
Kim, Keun-Yong ; Ko, Yong-Mok ; Park, Kyoung-Jin ; Kang, Een-Kyun ; Lee, Dae-Woo ; Park, Jong-Hyun ; Ra, Keuk-Whan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 8, 2013, Pages 308~315
DOI : 10.5573/ieek.2013.50.8.308
In this paper, Tapered slot antenna of IR-UWB was Designed and fabricated using HFSS and we suggest the beam width of the broadband antenna using group-delay and fidelity. For this purpose, acquired data from the Network Analyzer was analyzed in the time domain by using the chirp-Z transform and Simulation was conducted and confirmed with the CST microwave studio. Analysis of the antenna radiation pattern is the antenna separation at intervals of 0.5 metres and then transmit antenna is fixed and the receiving antenna 360 degree intervals of 10 degree each, The results of the analysis are as follows, and analyzer of the fidelity of the antenna's performance. An analysis of more than 90 percent of the cases is less than
degrees in good fidelity, more than 90% less than
degrees and lowe fidelity. In conclusion, Analysis of Beam width of wideband antenna with more precise is possible through using these radiation pattern using fidelity.