Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Institute of Electronics and Information Engineers
Journal Basic Information
Journal DOI :
The Institute of Electronics Engineers of Korea
Editor in Chief :
Volume & Issues
Volume 50, Issue 12 - Dec 2013
Volume 50, Issue 11 - Nov 2013
Volume 50, Issue 10 - Oct 2013
Volume 50, Issue 9 - Sep 2013
Volume 50, Issue 8 - Aug 2013
Volume 50, Issue 7 - Jul 2013
Volume 50, Issue 6 - Jun 2013
Volume 50, Issue 5 - May 2013
Volume 50, Issue 4 - Apr 2013
Volume 50, Issue 3 - Mar 2013
Volume 50, Issue 2 - Feb 2013
Volume 50, Issue 1 - Jan 2013
Selecting the target year
A Study on LMMSE Receiver for Single Stream HSDPA MIMO Systems using Precoding Weights
Joo, Jung Suk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 3~8
DOI : 10.5573/ieek.2013.50.4.003
In CDMA-based systems, recently, researches on chip-level equalization have been studied in order to improve receiving performance when supporting high-rate data services. In this paper, we consider a chip-level LMMSE (linear minimum mean-squared error) receiver for D-TxAA (dual stream transmit antenna array) based single stream HSDPA MIMO systems using precoding weights. First, we will derive precoding weights for maximizing the total instantaneous received power. We will also analyze the effects of both transmit delay of precoding weights and mobile velocity on chip-level LMMSE receivers, which is verified through computer simulations in various mobile channel environments.
Performance Analysis of Rotation-lock Differential Precoding Scheme
Kim, Young Ju ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 9~16
DOI : 10.5573/ieek.2013.50.4.009
Long term evolution (LTE) and LTE-Advanced (LTE-A) systems adopt closed-loop multiple-input multiple-output antenna techniques. Equal gain transmission which has equal gain property is the key factor in their codebook design. In this paper, a novel differential codebook structure which maintains the codebook design requirements of LTE or LTE-A systems. Especially, eight-phase shift keying (8-PSK) constellations are used as elements of codewords, which not only maintain equal gain property but also reduce the computation complexity of precoding and decoding function blocks. The equal gain property is very important to uplink because the performance of uplink is very sensitive to the peak-to-average power ratio (PAPR). Moreover, the operation of the proposed differential codebook is explained as a rotation-lock structure. As the results of computer simulations, the steady-state throughput performance of the proposed codebook shows at least 0.9dB of SNR better than those of the conventional LTE codebook with the same amount of feedback information.
An LDC-based MU-MIMO System with Pre-coding for Interference Cancellation and Robust Reception
Park, Myung Chul ; Jo, Bong-Gyun ; Han, Dong Seog ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 17~25
DOI : 10.5573/ieek.2013.50.4.017
In this paper, a coding algorithm is proposed for multi-user multi-input multi-output (MU-MIMO) systems to improve the reception performance in fading conditions without reducing the bandwidth efficiency. The space division multiple access (SDMA) scheme that is one of the commonly used for MU-MIMO systems is vulnerable to the fading. The space time block code (STBC) scheme that is used to overcome the fading has a disadvantage of reduced throughput. The proposed MU-MIMO system first encodes transmitted symbols by linear dispersion code (LDC) which is less vulnerable to the fading and increases the throughput in proportional to the number of transmit antennas. Then, the LDC coded symbols are pre-coded by the result of singular value decomposition (SVD) of the estimated channel gain. We evaluate the performance of the proposed scheme compared with the conventional algorithms by computer simulations.
Earth Reflection Effect Analysis in the Environment of Line Source Induction
Lee, Sangmu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 26~32
DOI : 10.5573/ieek.2013.50.4.026
The earth reflection effect on the induced voltage by line source such as power line occurring induction inteference is analyzed to scrutinize how much it would reduce the induced voltage. Using hankel transformation including bessel function, directly calculation formulae for extracting a refelction coefficient is a most important technical application in this paper since the reflection coefficient on the earth cannot be deduced by a general coefficient calculation formulae according to a plain wave. The electric field is utilized to transform the electromagnetic field into an induced voltage. The composed efficiency to a source induction voltage by an earth reflection is about a range of 60~70% for the axis constellation of each object like observation point, source position and other material parameters.
Analysis of Process and Layout Dependent Analog Performance of FinFET Structures using 3D Device Simulator
Noh, SeokSoon ; Kwon, KeeWon ; Kim, SoYoung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 35~42
DOI : 10.5573/ieek.2013.50.4.035
In this paper, the analog performance of FinFET structure was estimated by extracting the DC/AC characteristics of the 22 nm process FinFET structures with different layout considering spacer and SEG using 3D device simulator, Sentaurus. Based on the analysis results, layout methods to enhance the analog performance of multi-fin FinFET structures are proposed. By adding the spacer and SEG structures, the drive current of 1-fin FinFET increases. However, the unity gain frequency,
, reduces by 19.4 % due to the increase in the total capacitance caused by the added spacer. If the process element is not included in multi-fin FinFET, replacing 1-finger with 2-finger structure brings approximately 10 % of analog performance improvement. Considering the process factors, we propose methods to maximize the analog performance by optimizing the interconnect and gate structures.
Design of Low-Power 3rd-order Delta-Sigma Modulator
In, Byoung Wha ; Im, Saemin ; Park, Sang-Gyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 43~51
DOI : 10.5573/ieek.2013.50.4.043
This paper presents a design and implementation of a low power switched-capacitor 3rd-order delta-sigma modulator for a digital hearing-aid application. The power consumption is reduced by minimizing the output swing of integrators through optimizing the coefficients of modulator architecture and using class-AB output operational amplifiers. The modulator was implemented in a 130nm CMOS technology, and measured to have 79dB of SNR(Signal-to-Noise Ratio) in the signal bandwidth between 100Hz and 10kHz with an oversampling ratio of 160. The power consumption was
from 1.2V power supply and the modulator core occupied
Cache Replacement Policy Based on Dynamic Counter for High Performance Processor
Jung, Do Young ; Lee, Yong Surk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 52~58
DOI : 10.5573/ieek.2013.50.4.052
Replacement policy is one of the key factors determining the effectiveness of a cache. The LRU replacement policy has remained the standard for caches for many years. However, the traditional LRU has ineffective performance in zero-reuse line intensive workloads, although it performs well in high temporal locality workloads. To address this problem, We propose a new replacement policy; DCR(Dynamic Counter based Replacement) policy. A temporal locality of workload dynamically changes across time and DCR policy is based on the detection of these changing. DCR policy improves cache miss rate over a traditional LRU policy, by as much as 2.7% at maximum and 0.47% at average.
Design and Fabrication of An Improved Capacitor Multiplier with Good Frequency Characteristics
Lee, Dae-Hwan ; Back, Ki-Ju ; Han, Da-In ; Ryu, Byoung-Son ; Kim, Yeong-Seuk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 59~64
DOI : 10.5573/ieek.2013.50.4.059
In this paper, a capacitor multiplier with good frequency characteristics has been proposed. Effective capacitance of conventional capacitor multiplier decreases as frequency increases due to internal series resistance. On the other hand, the proposed capacitor multiplier using cascode structure has smaller internal resistance, thus shows good frequency characteristics. Conventional and proposed capacitor multiplier were fabricated using Samsung
CMOS process and frequency characteristics of capacitor multipliers were measured using LPF. Measurement results show that the conventional capacitor multiplier has maximum 53% of capacitance error, however the proposed multiplier has less than 10% of capacitance error for the frequency change from 100kHz to 1MHz.
Primitive IPs Design Based on a Memristor-CMOS Circuit Technology
Han, Ca-Ram ; Lee, Sang-Jin ; Eshraghian, Kamran ; Cho, Kyoungrok ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 65~72
DOI : 10.5573/ieek.2013.50.4.065
This paper presents design methodology for Memristor-CMOS circuits and its application to primitive IPs design. We proposed a Memristor model and designed basic elements, Memristor AND/OR gates. The primitive IPs based on a Memristor-CMOS technology is proposed for a Memristive system design. The netlists of IPs are extracted from the layouts of Memristor-CMOS and is verified with SPICE-like Memristor model under
CMOS technology. As a result, an example design Memristor-CMOS full adder has only 47.6 % of silicon area compare to the CMOS full-adder.
Experimental Model of Frequency-Variant Transmission Line Parameter for High-Speed Signal Propagation Characterization
Kim, Hyewon ; Eo, Yungseon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 73~80
DOI : 10.5573/ieek.2013.50.4.073
In this paper, an experimental circuit model for an accurate high-frequency characterization of transmission line is proposed. Inherent resonance effects during measurements make it difficult to determine characteristic impedance and propagation constant at the resonance frequencies corresponding to the line length. Thus, resonance-effect-free transmission line parameter determination technique based on the physical insight and theory is proposed. Then, by using the parameters high-frequency circuit model is proposed for high-speed signal propagation characterization. The proposed frequency-variant transmission line model is verified with measurement and it can be usefully exploited in high-speed signal propagation characterization.
The Changing Trace of Emotional state by Memory retrieval and Knowledge Reasoning process
Shim, JeongYon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 83~88
DOI : 10.5573/ieek.2013.50.4.083
Many studies adopting brain functions to the engineering systems have been made for recent years as the brain Science has developed. If we investigate the parts which take part in memorizing and emotional process, we can know that Hippocampus of memorizing center and Amygdala of Emotional center closely cooperate each other. Actually Knowledge effects on Emotion and Emotion effects on Knowledge. During the human decision making, emotional factor has much important effects on Decision making process. For implementing more delicate intelligent system, the knowledge base coupled to emotional factor should be designed. Accordingly in this paper starting from the idea of cooperating system between Hippocampus and Amygdala,, we design Knowledge Emotion Binding System and propose Emotional changing mechanism by Memory retrieval and knowledge reasoning process.
An Analytical Model for Performance Prediction of AES on GPU Architecture
Kim, Kyuwoon ; Kim, Hyunwoo ; Kim, Huijeong ; Huh, Taeyoung ; Jung, Sanghyuk ; Song, Yong Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 89~96
DOI : 10.5573/ieek.2013.50.4.089
The graphic processor unit (GPU) has been developed to process not only graphic data but also general system data. It shows a better performance than CPU in algorithm for 3D graphics and parallel program. In order to execute algorithm for CPU on GPU, we should understand about GPU architectures and rewrite program considering parallel processing capability and new memory model of GPU. For this reasons, a performance prediction model for the algorithm and its predicted performance through GPU system are required. These can predict problems in GPU application development or construct a performance evaluation standard for GPU. In this paper, we applied the AES encryption algorithms on our performance model and accomplished performance prediction with high accuracy under a heavy workload.
Media Access Control Protocol Considering MANET of Underwater Environment
Shin, Seung-Won ; Yun, Nam-Yeol ; Lee, Jin-Young ; Lee, Seung-Joo ; Park, Soo-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 97~107
DOI : 10.5573/ieek.2013.50.4.097
Underwater wireless communication systems can be useful for underwater environment observation, catastrophe prevention, ocean resources exploration, ocean organism research, vessel sinking exploration, and so on. However, unlike terrestrial wireless communication, underwater wireless communication should consider factors such as long propagation delay, limited transmission capacity, high bit-error rate due to potential loss in power, ambient noise, man-made noise, multi-path, etc., because of the inherent characteristics of water. Thus, in this paper, we propose a suitable media access control(MAC) protocol that applies a combination of the ALOHA MAC protocol and the CSMA/CA MAC protocol to underwater environment. We further propose a mathematical analysis model to evaluate performance. We also verify performance improvement in the proposed scheme in comparison with existing MAC protocols.
Performance of the Finite Difference Method Using Cache and Shared Memory for Massively Parallel Systems
Kim, Hyun Kyu ; Lee, Hyo Jong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 108~116
DOI : 10.5573/ieek.2013.50.4.108
Many algorithms have been introduced to improve performance by using massively parallel systems, which consist of several hundreds of processors. A typical example is a GPU system of many processors which uses shared memory. In the case of image filtering algorithms, which make references to neighboring points, the shared memory helps improve performance by frequently accessing adjacent pixels. However, using shared memory requires rewriting the existing codes and consequently results in complexity of the codes. Recent GPU systems support both L1 and L2 cache along with shared memory. Since the L1 cache memory is located in the same area as the shared memory, the improvement of performance is predictable by using the cache memory. In this paper, the performance of cache and shared memory were compared. In conclusion, the performance of cache-based algorithm is very similar to the one of shared memory. The complexity of the code appearing in a shared memory system, however, is resolved with the cache-based algorithm.
Data Deduplication Method using PRAM Cache in SSD Storage System
Kim, Ju-Kyeong ; Lee, Seung-Kyu ; Kim, Deok-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 117~123
DOI : 10.5573/ieek.2013.50.4.117
In the recent cloud storage environment, the amount of SSD (Solid-State Drive) replacing with the traditional hard disk drive is increasing. Management of SSD for its space efficiency has become important since SSD provides fast IO performance due to no mechanical movement whereas it has wearable characteristics and does not provide in place update. In order to manage space efficiency of SSD, data de-duplication technique is frequently used. However, this technique occurs much overhead because it consists of data chunking, hasing and hash matching operations. In this paper, we propose new data de-duplication method using PRAM cache. The proposed method uses hierarchical hash tables and LRU(Least Recently Used) for data replacement in PRAM. First hash table in DRAM is used to store hash values of data cached in the PRAM and second hash table in PRAM is used to store hash values of data in SSD storage. The method also enhance data reliability against power failure by maintaining backup of first hash table into PRAM. Experimental results show that average writing frequency and operation time of the proposed method are 44.2% and 38.8% less than those of existing data de-depulication method, respectively, when three workloads are used.
A Video Deblurring Algorithm based on Sharpness Metric for Uniform Sharpness between Frames
Lee, Byung-Ju ; Lee, Dong-Bok ; Song, Byung Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 127~136
DOI : 10.5573/ieek.2013.50.4.127
This paper proposes a video deblurring algorithm which maintains uniform sharpness between frames. Unlike the previous algorithms using fixed parameters, the proposed algorithm keeps uniform sharpness by adjusting parameters for each frame. First, we estimate the initial blur kernel and perform deconvolution, then measure the sharpness of the deblurred image. In order to maintain uniform sharpness, we adjust the regularization parameter and kernel according to the examined sharpness, and perform deconvolution again. The experimental results show that the proposed algorithm achieves outstanding deblurring results while providing consistent sharpness.
Enhancement of Spatial Resolution to Local Area for High Resolution Satellite Imagery
Kang, Ji-Yun ; Kim, Ihn-Cheol ; Kim, Jea-Hee ; Park, Jong Won ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 137~143
DOI : 10.5573/ieek.2013.50.4.137
The high resolution satellite images are used in many fields such as weather observation, remote sensing, military facilities monitoring, cultural properties protection etc. Although satellite images are obtained in same satellite imaging system, the satellite images are degraded depending on the condition of hardware(optical device, satellite operation altitude, image sensor, etc.). Due to the fact that changing the hardware of satellite imaging system is impossible for resolution enhancement of these degraded satellite after launching a satellite, therefore the method of resolution enhancement with satellite images is necessary. In this paper the resolution is enhances by using a Super Resolution(SR) algorithm. The SR algorithm is an algorithm to enhance the resolution of an image by uniting many low resolution images, so an output image has higher resolution than using other interpolation methods. But It is difficult to obtain many images of the same area. Therefore, to solve this problem, we applied SR after by applying the affine and projection transform. As a results, we found that the images applied SR after affine and projection transform have higher resolution than the images only applied SR.
Super-resolution Algorithm using Local Structure Analysis and Scene Adaptive Dictionary
Choi, Ik Hyun ; Lim, Kyoung Won ; Song, Byung Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 144~154
DOI : 10.5573/ieek.2013.50.4.144
This paper proposes a new super-resolution algorithm where sharpness enhancement is merged in order to improve overall visual quality of up-scaled images. In the learning stage, multiple dictionaries are generated according to sharpness strength, and a proper dictionary among those dictionaries is selected to adapt to each patch in the inference stage. Also, additional post-processing suppresses boosting of artifacts in input low-resolution images during the inference stage. Experimental results that the proposed algorithm provides 0.3 higher CPBD than the bi-cubic and 0.1 higher CPBD than Song's and Fan's algorithms. Also, we can observe that the proposed algorithm shows better quality in textures and edges than the previous works. Finally, the proposed algorithm has a merit in terms of computational complexity because it requires the memory of only 17% in comparison with the previous work.
Variable Block Size for Performance Improvement of Compressed Sensing
Ham, Woo-Gyu ; Ku, Jaseong ; Ahn, Chang-Beom ; Park, Hochong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 155~162
DOI : 10.5573/ieek.2013.50.4.155
The conventional block-based compressed sensing uses a fixed block size for signal reconstruction, and the reconstructed signal is degraded because the block size suitable to the signal characteristics is not used. To solve this problem, in this paper, a variable block size method for compressed sensing is proposed that estimates the signal characteristics and selects a proper block size for each frame, thereby improving the quality of the reconstructed signal. The proposed method reconstructs the signal with different block sizes, analyzes the signal characteristics using correlation coefficients for each frame, and select the block size for the frame. It is confirmed that, with the same acquired data, the proposed method reconstructs the signal of higher quality than the conventional fixed block size method.
Estimation of the Medium Transmission Using Graph-based Image Segmentation and Visibility Restoration
Kim, Sang-Kyoon ; Park, Jong-Hyun ; Park, Soon-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 163~170
DOI : 10.5573/ieek.2013.50.4.163
In general, images of outdoor scenes often contain degradation due to dust, water drop, haze, fog, smoke and so on, as a result they cause the contrast reduction and color fading. Haze removal is not easier problem due to the inherent ambiguity between the haze and the underlying scene. So, we propose a novel method to solve single scene dehazing problem using the region segmentation based on graph algorithm that has used a gradient value as a cost function. We segment the scene into different regions according to depth-related information and then estimate the global atmospheric light. The medium transmission can be directly estimated by the threshold function of graph-based segmentation algorithm. After estimating the medium transmission, we can restore the haze-free scene. We evaluated the degree of the visibility restoration between the proposed method and the existing methods by calculating the gradient of the edge between the restored scene and the original scene. Results on a variety of outdoor haze scene demonstrated the powerful haze removal and enhanced image quality of the proposed method.
A Preprocessing Method for Ground-Penetrating-Radar based Land-mine Detection System
Kong, Hae Jung ; Kim, Seong Dae ; Kim, Minju ; Han, Seung Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 171~181
DOI : 10.5573/ieek.2013.50.4.171
Recently, ground penetrating radar(GPR) has been widely used in detecting metallic and nonmetallic buried landmines and a number of related researches have been reported. A novel preprocessing method is proposed in this paper to flag potential locations of buried mine-like objects from GPR array measurements. GPR operates by measuring the reflection of an electromagnetic pulse from discontinuities in subsurface dielectric properties. As the GPR pulse propagates in the geologic medium, it suffers nonlinear attenuation as the result of absorption and dispersion, besides spherical divergence. In the proposed algorithm, a logarithmic transformed regression model which successfully represents the time-varying signal amplitude of the GPR data is estimated at first. Then, background signals may be densely distributed near the regression model and candidate signals of targets may be far away from the regression model in the time-amplitude space. Based on the observation, GPR signals are decomposed into candidate signals of targets and background signals using residuals computed from the estimated value by regression and the measurement of GPR. Candidate signals which may contain target signals and noise signals need to be refined. Finally, targets are detected through the refinement of candidate signals based on geometric signatures of mine-like objects. Our algorithm is evaluated using real GPR data obtained from indoor controlled environment and the experimental results demonstrate remarkable performance of our mine-like object detection method.
Target Classification Algorithm Using Complex-valued Support Vector Machine
Kang, Youn Joung ; Lee, Jaeil ; Bae, Jinho ; Lee, Chong Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 182~188
DOI : 10.5573/ieek.2013.50.4.182
In this paper, we propose a complex-valued support vector machine (SVM) classifier which process the complex valued signal measured by pulse doppler radar (PDR) to identify moving targets from the background. SVM is widely applied in the field of pattern recognition, but features which used to classify are almost real valued data. Proposed complex-valued SVM can classify the moving target using real valued data, imaginary valued data, and cross-information data. To design complex-valued SVM, we consider slack variables of real and complex axis, and use the KKT (Karush-Kuhn-Tucker) conditions for complex data. Also we apply radial basis function (RBF) as a kernel function which use a distance of complex values. To evaluate the performance of the complex-valued SVM, complex valued data from PDR were classified using real-valued SVM and complex-valued SVM. The proposed complex-valued SVM classification was improved compared to real-valued SVM for dog and human, respectively 8%, 10%, have been improved.
FL Deadzone Compensation of a Mobile robot
Jang, Jun Oh ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 191~202
DOI : 10.5573/ieek.2013.50.4.191
A control structure that makes possible the integration of a kinematic controller and a fuzzy logic (FL) deadzone compensator for mobile robots is presented. A tuning algorithm is given for the fuzzy logic parameters, so that the deadzone compensation scheme becomes adaptive, guaranteeing small tracking errors and bounded parameter estimates. Formal nonlinear stability proofs are given to show that the tracking error is small. The fuzzy logic deadzone compensator is implemented on a mobile robot to show its efficacy.
Impedance and Read Power Sensitivity Evaluation of Flip-Chip Bonded UHF RFID Tag Chip
Yang, Jeenmo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 203~211
DOI : 10.5573/ieek.2013.50.4.203
UHF RFID tag designers usually ndde the chip impedance and read power sensitivity value obtained when a tag chip is mounted on a chip pad. The chip impedance, however, is not able to be supplied by chip manufacturer, since the chip impedance is varied according to tag designs and fabrication processes. Instead, the chip makers mostly supply the chip impedances measured on the bare dies. This study proposes a chip impedance and read power sensitivity evaluation method which requires a few simple auxiliary and some RF measuring equipment. As it is impractical to measure the chip impedance directly at mounted chip terminals, some form test fixture is employed and the effect of the fixture is modeled and de-embeded to determine the chip impedance and the read power sensitivity. Validity and accuracy of the proposed de-embed method are examined by using commercial RFID tag chips as well as a capacitor and a resistor the value of which are known.
Implementation of Linear Motor Piston Amplitude Estimator Using Phase Lag Filter
Oh, Joon-Tae ; Kim, Gyu-Sik ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 212~218
DOI : 10.5573/ieek.2013.50.4.212
In this paper, a linear motor piston amplitude estimator using phase lag filter has been implemented. In order to control the cooling capability of a refrigerator or an air conditioner in which liner 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. The dynamic performance of linear compressors depends on how accurately the stroke or the piston amplitude is estimated. A linear motor piston amplitude estimator using phase lag filter is proposed and the superior performance of our estimator is verified via some simulation studies.
A Study on Improving the Position Accuracy of the Magnetic North used in Surveillance Imaging Equipments
Shin, Young-Don ; Lee, Jae-Chon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 219~228
DOI : 10.5573/ieek.2013.50.4.219
The surveillance imaging equipments are functioning to observe the shape of the target in real time or to measure its location precisely. The roles of such equipments are becoming more important in today's weapon systems.The aforementioned imaging equipments can be classified based on the modes of operations such as fixed, installed on cars, or composite of those. Also, according to different concepts of sensor operation, a separate type uses independent housing for each sensor whereas in a composite type a set of multiple sensors are housed into a unit altogether. The sensors in general have magnetism, thereby introducing the possible negative effects, particularly in the composite types, in locating the reference position, which is carried out by the digital compass. The use of shielding material/housing could be an option but results in increased weight and reduced portability, restricting its use in composite type equipments. As such, the objective of this paper is to study on how to reduce such magnetic effects on the position location. To do so, in the absence of magnetic shielding, a variety of sensor positions were first modeled. By combing the result with the fact that the functions of PAN & Tilt are used in the equipments, a new position location algorithm is proposed. The use of the new algorithm can automate the position location process as compared to the manual process of the existing approach. In the algorithm developed, twelve locations are measured in connection with both the azimuth and elevation angles in comparison to the six locations alone around the azimuth angle. As a result, it turns out that the measurement range has been widened but the measurement time reduced. Also, note that the effect of errors the operators may make during measurement could be reduced.
Implementation Issues in Brain Implantable Neural Interface Microsystem
Song, Yoon-Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 229~235
DOI : 10.5573/ieek.2013.50.4.229
In this paper, we investigate several important issues on the implementation of a totally implantable microsystem for brain-machine interface that has been attracting a lot of attention recently. So far most of the scientific research has been focused on the high performance, low power electronics or systems such as neural signal amplifiers and wireless signal transmitters, but the real application of the implantable microsystem is affected significantly by a number of factors, ranging from design of the encapsulation structure to physiological and anatomical characteristics of the brain. In this work, we discuss on the thermal effect of the system, the detecting volume of the neural probes, wireless data transmission and power delivery, and physiological and anatomical factors that are critically important for the actual implementation of a totally brain implantable neural interface microsystem.
Study of Data Retention Characteristics with surrounding cell's state in a MLC NAND Flash Memory
Choi, Deuk-Sung ; Choi, Sung-Un ; Park, Sung-Kye ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 239~245
DOI : 10.5573/ieek.2013.50.4.239
The data retention characteristics depending on neighbor cell's threshold voltage (Vt) in a multilevel NAND flash memory is studied. It is found that a Vt shift (
) of the noted cell during a thermal retention test is increased as the number of erase-state (lowest Vt state) cells surrounding the noted cell increases. It is because a charge loss from a floating gate is originated from not only intrinsic mechanism but also lateral electric field between the neighboring cells. From the electric field simulation, we can find that the electric field is increased and it results in the increased charge loss as the device is scaled down.
A Bandwidth a Allocation Scheme based on Bankruptcy theory in Distributed Mobile Multimedia Network
Jeong, Seong Soon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 246~251
DOI : 10.5573/ieek.2013.50.4.246
In this paper, it is proposed a bandwidth allocation Scheme based on Bankruptcy theory in Distributed Mobile Multimedia Network. The proposed scheme is guaranteed a minimum allocation. So, the minimum quality of each service are guaranteed. Therefore efficient and fairness network can be configured. The performance evaluation results indicate that the proposed scheme has good performance than other existing schemes by the fairness index and the Erlang blocking formular calculation. The minimum bandwidth of the proposed scheme can be applied to other techniques of a priority based bandwidth allocation scheme and dynamic bandwidth allocation scheme.
An Energy Efficient Clustering Scheme for WSNs
Chung, Kil-Soo ; Lee, Won-Seok ; Song, ChangYoung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 4, 2013, Pages 252~258
DOI : 10.5573/ieek.2013.50.4.252
As WSN is energy constraint so energy efficiency of nodes is important. Because avoiding long distance communication, clustering operating in rounds is an efficient algorithm for prolonging the lifetime of WSN and its performance depends on duration of a round. A short round time leads to frequent re-clustering while a long round time increases energy consume of cluster heads more. So existing clustering schemes determine proper round time, based on the parameters of initial WSN. But it is not appropriate to apply the round time according to initial value throughout the whole network time because WSN is very dynamic networks nodes can be added or vanished. In this paper we propose a new algorithm which calculates the round time relying on the alive node number to adapt the dynamic WSN. Simulation results validate the proposed algorithm has better performance in terms of energy consumption of nodes and loss rate of data.