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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 52, Issue 12 - Dec 2015
Volume 52, Issue 11 - Nov 2015
Volume 52, Issue 10 - Oct 2015
Volume 52, Issue 9 - Sep 2015
Volume 52, Issue 8 - Aug 2015
Volume 52, Issue 7 - Jul 2015
Volume 52, Issue 6 - Jun 2015
Volume 52, Issue 5 - May 2015
Volume 52, Issue 4 - Apr 2015
Volume 52, Issue 3 - Mar 2015
Volume 52, Issue 2 - Feb 2015
Volume 52, Issue 1 - Jan 2015
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Energy Optimized Transmission Strategy in CDMA Reverse Link: Graph Theoretic Approach
Oh, Changyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 3~9
DOI : 10.5573/ieie.2015.52.6.003
We investigate rate scheduling and power allocation problem for a delay constrained CDMA systems. Specifically, we determine an energy efficient scheduling policy, while each user maintains the short term (n time slots) average throughput. We consider a multirate CDMA system where multirate is achieved by multiple codes. Each code can be interpreted as a virtual user. The aim is to schedule the virtual users into each time slot, such that the sum of transmit energy in n time slots is minimized. We then show that the total energy minimization problem can be solved by a shortest path algorithm. We compare the performance of the optimum scheduling with that of TDMA-type scheduling.
Two Dimensional Inter-symbol Interference Compensation for Holographic Data Storage
Jeong, Seongkwon ; Lee, Jaejin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 10~14
DOI : 10.5573/ieie.2015.52.6.010
In holographic data storage systems, data is recorded and read by page on a volume of storage medium, and it can increase transmission rate and storage capacity because of two-dimensional page-oriented data processing by charge-coupled devices. However, HDS suffers two-dimensional intersymbol interference unlike conventional data storages. In this paper, we propose a preprocessing method of decreasing ISI before read data in HDS pass to detector. This method has some advantage when we collaborate with the preprocessing for reducing misalignment error and modulation code.
Two Dimensional Intersymbol Interference Compensation for Bit Patterned Media
Jeong, Seongkwon ; Lee, Jaejin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 15~20
DOI : 10.5573/ieie.2015.52.6.015
Bit patterned media (BPM) is a high capacity storage system and has attracted a great deal of attention as next generation data storage. When BPM is made with high density, the space between the islands narrows, because BPM records one bit in an island. For this reason, BPM has inter-symbol interference in all directions, unlike in current storage systems where it is in only one direction. In this paper, we propose an equation for compensating two-dimensional ISI. We conduct experiments on track misregistration. When using the proposed inter-symbol interference preprocessing, the BER performance is improved, regardless of the amount of track misregistration.
Two-dimensional Binary Search Tree for Packet Classification at Internet Routers
Lee, Goeun ; Lim, Hyesook ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 21~31
DOI : 10.5573/ieie.2015.52.6.021
The Internet users want to get real-time services for various multi-media applications. Network traffic rate has been rapidly increased, and data amounts that the Internet has to carry have been exponentially increased. A packet is the basic unit in transferring data at the Internet, and packet classification is one of the most challenging functionalities that routers should perform at wire-speed. Among various known packet classification algorithms, area-based quad-trie (AQT) algorithm is one of the efficient algorithms which can lookup five header fields simultaneously. As a representative space decomposition algorithm, the AQT requires a small amount of memory in storing classification rules, but it does not provide high-speed classification performance. In this paper, we propose a new packet classification algorithm by applying a binary search for the codewords of the AQT to overcome the issue of the AQT. Throughout simulation, it is shown that the proposed algorithm provides a better performance than the AQT in the number of rule comparisons with each input packet.
Analysis of Optimum Antenna Placement Considering Interference Between Airborne Antennas Mounted on UAV
Choi, Jaewon ; Kim, Jihoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 32~40
DOI : 10.5573/ieie.2015.52.6.032
In this paper, the optimum antenna placement is analyzed by considering the interference between airborne antennas mounted on the unmanned aerial vehicle(UAV). The analysis is implemented by selecting the antennas that the distance and operational frequency band between airborne antennas is close to each other among the omni-directional antennas. The analyzed antennas are the control datalink, TCAS(Traffic Collision & Avoidance System), IFF(Identification Friend or Foe), GPS(Global Positioning System), and RALT(Radar ALTimeter) antennas. There are three steps for the optimum antenna placement analysis. The first step is selecting the antenna position having the optimum properties by monitoring the variation of radiation pattern and return loss by the fuselage of UAV after selecting the initial antenna position considering the antenna use, type, and radiation pattern. The second one is analyzing the interference strength between airborne antennas considering the coupling between airborne antennas, spurious of transmitting antenna, and minimum receiving level of receiving antenna. In case of generating the interference, the antenna position without interference is selected by analyzing the minimum separation distance without interference. The last one is confirming the measure to reject the frequency interference by the frequency separation analysis between airborne antennas in case that the intereference is not rejected by the additional distance separation between airborne antennas. This analysis procedure can be efficiently used to select the optimum antenna placement without interference by predicting the interference between airborne antennas in the development stage.
High Efficiency Magnetic Resonance Wireless Power Transfer System and Battery Charging Chip
Youn, Jin Hwan ; Park, Seong Yeol ; Choi, Jun Rim ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 43~49
DOI : 10.5573/ieie.2015.52.6.043
In this paper, we propose enhanced wireless power transfer system based on magnetic resonance for portable electronic device charging. Resonators were designed and fabricated for efficiency improvement and miniaturization through electromagnetism simulation using HFSS(High Frequency Structure Simulator). Impedance matching network is employed to minimize reflections that is caused by difference between input impedance and output impedance. Receiver IC that consist of rectifier and Low Drop Out(LDO) regulator were designed and fabricated to reduce power loss. This chip is implemented in
BCD technology. A maximum overall efficiency of 73.8% is determined for the system through experimental verification.
Design of Hysteretic Buck Converter with A Low Output Ripple Voltage and Fixed Switching Frequency in CCM
Jeong, Tae-Jin ; Jo, Yong-Min ; Lee, Tae-Heon ; Yoon, Kwang Sub ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 50~56
DOI : 10.5573/ieie.2015.52.6.050
An efficient fast response hysteretic buck converter suitable for mobile application is propoesed. The problems of large output ripple and difficulty in using of small power inductor that conventional hysteretic converter has are improved by adding ramp generator. and the changeable switching frequency with load current is fixed by adding a delay time control circuit composed of PLL structure resulting in decrease of EMI noise. The circuits are implemented by using BCDMOS 0.35um 2-polt 4-metal process. Measurement results show that the converter operates with a switching frequency of 1.85MHz when drives 80mA load current. As the converter drives over 170mA load current, the switching frequency is fixed on 2MHz. The converter has output ripple voltage of less 20mV and more than efficiency 85% with 50~500mA laod current condition.
Hierarchical Fast Mode Decision Algorithm for Intra Prediction in HEVC
Kim, Tae Sun ; Sunwoo, Myung Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 57~61
DOI : 10.5573/ieie.2015.52.6.057
This paper proposes a fast intra prediction algorithm for the High Efficiency Video Coding (HEVC). HEVC has 35 modes, such as DC mode, Planar mode, and 33 angular modes for the intra-prediction. To reduce the complexity and to support fast decision for intra prediction, this paper proposes a hierarchical mode decision method (HMD). The proposed HMD mainly focuses on how to reduce the number of prediction modes. The experimental results show that the proposed HMD can reduce the encoding time about 39.17% with little BDBR loss. On average, the proposed HMD can achieve the encoding time saving e about 14.13 ~ 19.37% compared to that of the existing algorithms with slightly increasing 0.01 ~ 0.42% BDBR.
A New Motion Compensated Frame Interpolation Algorithm Using Adaptive Motion Estimation
Hwang, Inseo ; Jung, Ho Sun ; Sunwoo, Myung Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 62~69
DOI : 10.5573/ieie.2015.52.6.062
In this paper, a new frame rate up conversion (FRUC) algorithm using adaptive motion estimation (AME-FRUC) is proposed. The proposed algorithm performs extended bilateral motion estimation (EBME) conducts motion estimation (ME) processes on the static region, and extract region of interest with the motion vector (MV). In the region of interest block, the proposed AME-FRUC uses the texture block partitioning scheme and the unilateral motion estimation for improving ME accuracy. Finally, motion compensated frame interpolation (MCFI) are adopted to interpolate the intermediate frame in which MCFI is employed adaptively based on ME scheme. Experimental results show that the proposed algorithm improves the PSNR up to 3dB, the SSIM up to 0.07 and 68% lower SAD calculations compared to the EBME and the conventional FRUC algorithms.
A Design of FPGA Self-test Circuit Reusing FPGA Boundary Scan Chain
Yoon, Hyunsik ; Kang, Taegeun ; Yi, Hyunbean ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 70~76
DOI : 10.5573/ieie.2015.52.6.070
This paper introduces an FPGA self-test architecture reusing FPGA boundary scan chain as self-test circuits. An FPGA boundary scan cell is two or three times bigger than a normal boundary scan cell because it is used for configuring the function of input/output pins functions as well as testing and debugging. Accordingly, we analyze the architecture of an FPGA boundary scan cell in detail and design a set of built-in self-test (BIST) circuits in which FPGA boundary scan chain and a small amount of FPGA logic elements. By reusing FPGA boundary scan chain for self-test, we can reduce area overhead and perform a processor based on-board FPGA testing/monitoring. Experimental results show the area overhead comparison and simulation results.
Forensic Decision of Median Filtering by Pixel Value's Gradients of Digital Image
RHEE, Kang Hyeon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 79~84
DOI : 10.5573/ieie.2015.52.6.079
In a distribution of digital image, there is a serious problem that is a distribution of the altered image by a forger. For the problem solution, this paper proposes a median filtering (MF) image forensic decision algorithm using a feature vector according to the pixel value's gradients. In the proposed algorithm, AR (Autoregressive) coefficients are computed from pixel value' gradients of original image then 1th~6th order coefficients to be six feature vector. And the reconstructed image is produced by the solution of Poisson's equation with the gradients. From the difference image between original and its reconstructed image, four feature vector (Average value, Max. value and the coordinate i,j of Max. value) is extracted. Subsequently, Two kinds of the feature vector combined to 10 Dim. feature vector that is used in the learning of a SVM (Support Vector Machine) classification for MF (Median Filtering) detector of the altered image. On the proposed algorithm of the median filtering detection, compare to MFR (Median Filter Residual) scheme that had the same 10 Dim. feature vectors, the performance is excellent at Unaltered, Averaging filtering (
) and JPEG (QF=90) images, and less at Gaussian filtering (
) image. However, in the measured performances of all items, AUC (Area Under Curve) by the sensitivity and 1-specificity is approached to 1. Thus, it is confirmed that the grade evaluation of the proposed algorithm is 'Excellent (A)'.
High Performance QoS Multicast Routing Scheme for Real-Time Mobile Multimedia Applications in Wireless Mesh Networks
Kang, Moonsik ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 85~94
DOI : 10.5573/ieie.2015.52.6.085
In this paper, an enhanced QoS multicast routing scheduling scheme is proposed to adapt to a dynamic mobile traffic condition for wireless mesh networks (WMNs). It handles the network QoS by controlling the delay constraints for multimedia applications. The group size will be controlled according to both the current network state and QoS requirements. The dynamic reconstruction of QoS multicast tree can be obtained from preprocessing with both the partial multicast routing scheme and the traffic estimation. Performance evaluation of the proposed scheme is carried out on randomly generated graph derived from the wireless mesh network, by choosing the optimal value related to the appropriate delay bounds. Simulation results show that the proposed scheme can improve the performance of QoS multicast routing for WMNs.
Stay Point Extraction Method that Improve Accuracy of Location and to Distinguish Between Indoors & Outdoors
Park, Jin-Gwan ; Lee, Seong-Ro ; Jung, Min-A ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 95~104
DOI : 10.5573/ieie.2015.52.6.095
Recently, collecting and analyzing method of users location has been studied due to the development of mobile devices. There is analyzing method using Semantic Location History in order to identify of characteristics and extract pattern and predict trajectory of users. We should extraction of Stay Point in order to use Semantic Location History. The Conventional extraction method of Stay Point is not accuracy of location of Stay Points because it does not specify the GPS log of users. Also, Conventional extraction method of Stay Point cannot distinguish indoors and outdoors. In this paper, we implement extraction method of Stay Point in which specify the GPS log of users and extraction of Stay Point at indoors only. Stay Point(nearSP) specifies the nearest GPS log of users from generated Stay Point by conventional extraction method. And, Stay Point(indoorSP) specifies the GPS log of users that user get into the building. Our experimental results, accuracy of Stay Point is improved, and capacity of output data decrease than Conventional extraction method. Also, we were able to distinguish Stay Point of indoors and outdoors.
Positive Random Forest based Robust Object Tracking
Cho, Yunsub ; Jeong, Soowoong ; Lee, Sangkeun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 107~116
DOI : 10.5573/ieie.2015.52.6.107
In compliance with digital device growth, the proliferation of high-tech computers, the availability of high quality and inexpensive video cameras, the demands for automated video analysis is increasing, especially in field of intelligent monitor system, video compression and robot vision. That is why object tracking of computer vision comes into the spotlight. Tracking is the process of locating a moving object over time using a camera. The consideration of object's scale, rotation and shape deformation is the most important thing in robust object tracking. In this paper, we propose a robust object tracking scheme using Random Forest. Specifically, an object detection scheme based on region covariance and ZNCC(zeros mean normalized cross correlation) is adopted for estimating accurate object location. Next, the detected region will be divided into five regions for random forest-based learning. The five regions are verified by random forest. The verified regions are put into the model pool. Finally, the input model is updated for the object location correction when the region does not contain the object. The experiments shows that the proposed method produces better accurate performance with respect to object location than the existing methods.
Feature Extraction and Classification of Posture for Four-Joint based Human Motion Data Analysis
Ko, Kyeong-Ri ; Pan, Sung Bum ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 117~125
DOI : 10.5573/ieie.2015.52.6.117
In the modern age, it is important for people to maintain a good sitting posture because they spend long hours sitting. Posture correction treatment requires a great deal of time and expenses with continuous observation by a specialist. Therefore, there is a need for a system with which users can judge and correct their postures on their own. In this study, we collected users' postures and judged whether they are normal or abnormal. To obtain a user's posture, we propose a four-joint motion capture system that uses inertial sensors. The system collects the subject's postures, and features are extracted from the collected data to build a database. The data in the DB are classified into normal and abnormal postures after posture learning using the K-means clustering algorithm. An experiment was performed to classify the posture from the joints' rotation angles and positions; the normal posture judgment reached a success rate of 99.79%. This result suggests that the features of the four joints can be used to judge and help correct a user's posture through application to a spinal disease prevention system in the future.
Sleep/Wake Dynamic Classifier based on Wearable Accelerometer Device Measurement
Park, Jaihyun ; Kim, Daehun ; Ku, Bonhwa ; Ko, Hanseok ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 126~134
DOI : 10.5573/ieie.2015.52.6.126
A sleep disorder is being recognized as one of the major health issues related to high levels of stress. At the same time, interests about quality of sleep are rapidly increasing. However, diagnosing sleep disorder is not a simple task because patients should undergo polysomnography test, which requires a long time and high cost. To solve this problem, an accelerometer embedded wrist-worn device is being considered as a simple and low cost solution. However, conventional methods determine a state of user to "sleep" or "wake" according to whether values of individual section's accelerometer data exceed a certain threshold or not. As a result, a high miss-classification rate is observed due to user's intermittent movements while sleeping and tiny movements while awake. In this paper, we propose a novel method that resolves the above problems by employing a dynamic classifier which evaluates a similarity between the neighboring data scores obtained from SVM classifier. A performance of the proposed method is evaluated using 50 data sets and its superiority is verified by achieving 88.9% accuracy, 88.9% sensitivity, and 88.5% specificity.
Field-Programmable Gate Array-based Time-to-Digital Converter using Pulse-train Input Method for Large Dynamic Range
Kim, Do-hyung ; Lim, Han-sang ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 137~143
DOI : 10.5573/ieie.2015.52.6.137
A delay-line type time-to-digital converter (TDC) implemented in a field-programmable gate array (FPGA) is most widely owing due to its simple structure and high conversion rate. However, the delay-line type TDC suffers from nonlinearity error caused by the long delay-line because its time interval measurement range is determined by the length of the used delay line. In this study, a new TDC structure with a shorter delay line by taking a pulse train as an input is proposed for improved time accuracy and efficient use of resources. The proposed TDC utilizes a pulse-train with four transitions and a transition state detector that identifies the used transition among four transitions and prevents the meta-stable state without a synchronizer. With 72 delay cells, the measured resolution and maximum non-linearity were 20.53 ps, and 1.46 LSB, respectively, and the time interval measurement range was 5070 ps which was enhanced by approximately 343 % compared to the conventional delay-line type TDC.
Research on Distributed Sensor Device Resource Object Collaboration Service Providing System based on Service Delivery Platform
Yoon, Changwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 144~150
DOI : 10.5573/ieie.2015.52.6.144
A system for providing a distributed device resource-object-connection service based on a service delivery platform (SDP) is described. The system includes an SDP and proxy. The SDP configures to define distributed service functions as enablers, generates a convergence service by combining the enablers, and provides the generated convergence service. The proxy configures to connect a distributed device and an SDP to allow the SDP to use the distributed device as a resource, and define and use the distributed device as an enabler. The system are capable of defining distributed service functions as well as distributed sensors as enablers, and thereby allowing the distributed sensors to be used in the same sense as service-function enablers.
Real-time Experiments of WA-DGNSS Transmission System using Pseudolite
Kwon, Keum-Cheol ; Shim, Duk-Sun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 6, 2015, Pages 151~158
DOI : 10.5573/ieie.2015.52.6.151
This paper presents the real-time experiments of WA-DGNSS transmission system using a pseudolite and shows the performance of WA-DGNSS. We implement a server/client program to receive the WA-DGNSS data from the master station, and fabricate a pseudolite to transmit the WA-DGNSS data to users. The performance of the WA-DGNSS transmission system is tested by software and hardware GPS receivers, respectively. The experiments show that the WA-DGNSS data is well transmitted to GPS receivers without errors and thus WA-DGNSS works well.