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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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Identification of WLAN Signals Using the Difference in the Occupied Bandwidth
Lim, Chang Heon ; Kim, Hyung Jung ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 3~7
DOI : 10.5573/ieie.2015.52.9.003
Recently, a lot of research effort has been directed toward spectrum sensing and identification of OFDM signals as the OFDM technique has been adopted for transmission in many wireless communications standards. Among them, two popular WLAN standards, IEEE 802.11a and IEEE 802.11n, have a very similar OFDM symbol structure in terms of the lengths of CP(cyclic prefix) and effective OFDM symbol and so it is not straightforward to distinguish them with existing spectrum sensing methods based on the difference in the parameters. In this paper, we present a spectrum sensing strategy for identifying them by exploiting the fact that they employ different bandwidths and examine its performance.
4-level 3/4 Modulation Code for Holographic Data Storage
Jeong, Seongkwon ; Lee, Jaejin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 8~12
DOI : 10.5573/ieie.2015.52.9.008
A Holographic data storage has some advantage of fast transmission, short access time and high storage capacity. However, it has several problems such as inter-symbol interference, inter-page interference and misalignment. Especially, for multi-level holographic data storage system, since one pixel contains more than 1bit, the system is more vulnerable to the error. In this paper, we propose a 3/4 modulation code which mitigate inter-symbol interference for 4-level holographic data storage.
Multilevel Modulation Codes for Holographic Data Storage
Jeong, Seongkwon ; Lee, Jaejin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 13~18
DOI : 10.5573/ieie.2015.52.9.013
The mutilevel holographic data storage offers considerable advantage for capacity, since it can store more than one bit per pixel. In this paper, we search the number of codewords for each code depending on three conditions: (1) the number of levels, (2) the number of pixels in a codeword, and (3) the minimum Euclidean distance of a code. Increasing the number of levels per pixel creates more capacity, while causing more errors, by reducing the noise margin. Increasing the number of pixels in a codeword can increase the code rate, which means more capacity, but increases the complexity of the encoder/decoder of the code. Increasing the minimum distance of a code reduces the detection error, while reducing the code rate of the code. In such a fashion, a system design will always have pros and cons, but our task is to find out an effective one under the given conditions for the system requirements. Therefore, the numbers we searched can provide some guidelines for effective code design.
A Study on Improved Optimization Method for Modeling High Resistivity SOI RF CMOS Symmetric Inductor
Ahn, Jahyun ; Lee, Seonghearn ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 21~27
DOI : 10.5573/ieie.2015.52.9.021
An improved method based on direct extraction and simultaneous optimization is developed to determine model parameters of symmetric inductors fabricated by the high resistivity(HR) silicon-on-insulator(SOI) RF CMOS process. In order to improve modeling accuracy, several model parameters are directly extracted by Y and Z-parameter equations derived from two equivalent circuits of symmetric inductor and grounded center-tap one, and the number of unknown parameters is reduced using parallel resistance and total inductance equations. In order to improve optimization accuracy, two sets of measured S-parameters are simultaneously optimized while same model parameters in two equivalent circuits are set to common variables.
Reduction of the Number of Power States for High-level Power Models based on Clock Gating Enable Signals
Choi, Hosuk ; Yi, Joonhwan ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 28~35
DOI : 10.5573/ieie.2015.52.9.028
In this paper, we propose to identify redundant power states of high-level power model based on clock gating enable signals(CGENs) using dependencies of Boolean functions and structural dependencies of clock gating cells. Three functional dependencies between two CGENs, namely equvalence, inversion, and inclusion, are used. Functions of CGENs in a circuit are represented by binary decision diagrams (BDDs) and the functional relations are used to reduce the number of power states. The structural dependency appears when a clock gating cell drives another clock gating cells in a circuit. Automatic dependency checking algorithm has been proposed. The experimental results show the average number of power state is reduced by 59%.
A Low-Complexity Processor for Joint Vignetting and Barrel distortion Correction for Wide-Angle Cameras
Moon, Sun-A ; Hong, Jin-U ; Kim, Won-Tae ; Kim, Tae-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 36~44
DOI : 10.5573/ieie.2015.52.9.036
This paper proposes a low-complexity processor to correct vignetting and barrel distortion for wide-angle cameras. The proposed processor calculates the required correcting factors by employing the piecewise linear approximation so that the hardware complexity can be reduced significantly while maintaining correction quality. In addition, the processor is designed to correct the two distortions concurrently in a singular pipeline, which reduces the overall complexity. The proposed processor is implemented with 18.6K logic gates in a
CMOS process and shows the maximum correction speed of 200Mpixels/s for correcting an image of which size is
Efficient VLSI Architecture for Disparity Calculation based on Geodesic Support-weight
Ryu, Donghoon ; Park, Taegeun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 45~53
DOI : 10.5573/ieie.2015.52.9.045
Adaptive support-weight based algorithm can produce better disparity map compared to generic area-based algorithms and also can be implemented as a realtime system. In this paper, we propose a realtime system based on geodesic support-weight which performs better segmentation of objects in the window. The data scheduling is analyzed for efficient hardware design and better performance and the parallel architecture for weight update which takes the longest delay is proposed. The exponential function is efficiently designed using a simple step function by careful error analysis. The proposed architecture is designed with verilogHDL and synthesized using Donbu Hitek 0.18um standard cell library. The proposed system shows 2.22% of error rate and can run up to 260Mhz (25fps) operation frequency with 182K gates.
An Empirical Study on Linux I/O stack for the Lifetime of SSD Perspective
Jeong, Nam Ki ; Han, Tae Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 54~62
DOI : 10.5573/ieie.2015.52.9.054
Although NAND flash-based SSD (Solid-State Drive) provides superior performance in comparison to HDD (Hard Disk Drive), it has a major drawback in write endurance. As a result, the lifetime of SSD is determined by the workload and thus it becomes a big challenge in current technology trend of such as the shifting from SLC (Single Level Cell) to MLC (Multi Level cell) and even TLC (Triple Level Cell). Most previous studies have dealt with wear-leveling or improving SSD lifetime regarding hardware architecture. In this paper, we propose the optimal configuration of host I/O stack focusing on file system, I/O scheduler, and link power management using JEDEC enterprise workloads in terms of WAF (Write Amplification Factor) which represents the efficiency perspective of SSD life time especially for host write processing into flash memory. Experimental analysis shows that the optimum configuration of I/O stack for the perspective of SSD lifetime is MinPower-Dead-XFS which prolongs the lifetime of SSD approximately 2.6 times in comparison with MaxPower-Cfq-Ext4, the best performance combination. Though the performance was reduced by 13%, this contributions demonstrates a considerable aspect of SSD lifetime in relation to I/O stack optimization.
A Non-Calibrated 2x Interleaved 10b 120MS/s Pipeline SAR ADC with Minimized Channel Offset Mismatch
Cho, Young-Sae ; Shim, Hyun-Sun ; Lee, Seung-Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 63~73
DOI : 10.5573/ieie.2015.52.9.063
This work proposes a 2-channel time-interleaved (T-I) 10b 120MS/s pipeline SAR ADC minimizing offset mismatch between channels without any calibration scheme. The proposed ADC employs a 2-channel SAR and T-I topology based on a 2-step pipeline ADC with 4b and 7b in the first and second stage for high conversion rate and low power consumption. Analog circuits such as comparator and residue amplifier are shared between channels to minimize power consumption, chip area, and offset mismatch which limits the ADC linearity in the conventional T-I architecture, without any calibration scheme. The TSPC D flip-flop with a short propagation delay and a small number of transistors is used in the SAR logic instead of the conventional static D flip-flop to achieve high-speed SAR operation as well as low power consumption and chip area. Three separate reference voltage drivers for 4b SAR, 7b SAR circuits and a single residue amplifier prevent undesirable disturbance among the reference voltages due to each different switching operation and minimize gain mismatch between channels. High-frequency clocks with a controllable duty cycle are generated on chip to eliminate the need of external complicated high-frequency clocks for SAR operation. The prototype ADC in a 45nm CMOS technology demonstrates a measured DNL and INL within 0.69LSB and 0.77LSB, with a maximum SNDR and SFDR of 50.9dB and 59.7dB at 120MS/s, respectively. The proposed ADC occupies an active die area of 0.36mm2 and consumes 8.8mW at a 1.1V supply voltage.
Hierarchical Hidden Markov Model for Finger Language Recognition
Kwon, Jae-Hong ; Kim, Tae-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 77~85
DOI : 10.5573/ieie.2015.52.9.077
The finger language is the part of the sign language, which is a language system that expresses vowels and consonants with hand gestures. Korean finger language has 31 gestures and each of them needs a lot of learning models for accurate recognition. If there exist mass learning models, it spends a lot of time to search. So a real-time awareness system concentrates on how to reduce search spaces. For solving these problems, this paper suggest a hierarchy HMM structure that reduces the exploration space effectively without decreasing recognition rate. The Korean finger language is divided into 3 categories according to the direction of a wrist, and a model can be searched within these categories. Pre-classification can discern a similar finger Korean language. And it makes a search space to be managed effectively. Therefore the proposed method can be applied on the real-time recognition system. Experimental results demonstrate that the proposed method can reduce the time about three times than general HMM recognition method.
Vision-based Real-Time Two-dimensional Bar Code Detection System at Long Range
Yun, In Yong ; Kim, Joong Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 89~95
DOI : 10.5573/ieie.2015.52.9.089
In this paper, we propose a real-time two-dimensional bar code detection system even at long range using a vision technique. We first perform short-range detection, and then long-range detection if the short-range detection is not successful. First, edge map generation, image binarization, and connect component labeling (CCL) are performed in order to select a region of interest (ROI). After interpolating the selected ROI using bilinear interpolation, a location symbol pattern is detected as the same as for short-range detection. Finally, the symbol pattern is arranged by applying inverse perspective transformation to localize bar codes. Experimental results demonstrate that the proposed system successfully detects bar codes at two or three times longer distance than existing ones even at indoor environment.
DSP Optimization for Rain Detection and Removal Algorithm
Choi, Dong Yoon ; Seo, Seung Ji ; Song, Byung Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 96~105
DOI : 10.5573/ieie.2015.52.9.096
This paper proposes a DSP optimization solution of rain detection and removal algorithm. We propose rain detection and removal algorithms considering camera motion, and also presents optimization results in algorithm level and DSP level. At algorithm level, this paper utilizes a block level binary pattern analysis, and reduces the operation time by using the fast motion estimation algorithm. Also, the algorithm is optimized at DSP level through inter memory optimization, EDMA, and software pipelining for real-time operation. Experiment results show that the proposed algorithm is superior to the other algorithms in terms of visual quality as well as processing speed.
Visually Weighted Group-Sparsity Recovery for Compressed Sensing of Color Images with Edge-Preserving Filter
Nguyen, Viet Anh ; Trinh, Chien Van ; Park, Younghyeon ; Jeon, Byeungwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 106~113
DOI : 10.5573/ieie.2015.52.9.106
This paper integrates human visual system (HVS) characteristics into compressed sensing recovery of color images. The proposed visual weighting of each color channel in group-sparsity minimization not only pursues sparsity level of image but also reflects HVS characteristics well. Additionally, an edge-preserving filter is embedded in the scheme to remove noise while preserving edges of image so that quality of reconstructed image is further enhanced. Experimental results show that the average PSNR of the proposed method is 0.56 ~ 4dB higher than that of the state-of-the art group-sparsity minimization method. These results prove the excellence of the proposed method in both terms of objective and subjective qualities.
Gadoteridol`s Signal Change according to TR, TE Parameters in T1 Image
Jeong, Hyun Keun ; Jeong, Hyun Do ; Nam, Ki Chang ; Kim, Ho Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 117~124
DOI : 10.5573/ieie.2015.52.9.117
In this paper, we introduce how to control TR, TE physical MR parameters for managing
spin`s SI(Signal Intensity) which is combined with gadolinium following administration MR agent in T1 effect for diagnostic usefulness. we used MRI phantom made with 0.5 mol Gadoteridol. This phantom was scanned by FSE sequence with different TR, TE parameters. In this study, to make T1 effect, TR was 200, 250, 300, 350, 400, 450, 500, 550, 600 msec. In addition to, TE was 6.2, 12.4, 18.6, 21.6 msec. The results were as follows ; Each RSP(Reaction Starting Point) was 100, 50, 40, 30 mmol in TE 6.2, 12.4, 18.6, 21.6 msec being irrelevant to TR. In MPSI(Max Peak Signal Intensity), 4 mmol was showed in TR 200 msec while peak signal was decreased to low concentration mol in TR 250-600 msec. In terms of RA(Reaction Area), the highest SI was TE 6.2 msec in TR 200-600msec. According to the study, we are able to recognize it is possible to control enhance rates by managing TR and TE of MR parameters; moreover, we expect that enhanced T1 image in MR clinical field can be performed in a practical way with this quantitative data.
A Study on Dependency Tracking Target Aiming Systems Improvement of the Naval Electro Optical Tracking Systems
Shim, Bo-hyun ; Jo, Hee-jin ; Kim, Jang-eun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 125~131
DOI : 10.5573/ieie.2015.52.9.125
The simulation programs with the kalman filter for the naval Electro Optical Tracking System(EOTS) is presented. We achieve that the dependency tracking aiming systems performance of EOTS can be enhanced by minimizing the target information error which including transfer delay and measurement. According to our experiment results, kalman filter can be used for various electro optical systems to eliminate error value.
Design of Multibyte-based Streaming XML Hardware Parser
Lee, Kyu-Hee ; Seo, Byeong-Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 135~140
DOI : 10.5573/ieie.2015.52.9.135
Web-services employ XML that is the well-formed structure as a de-facto standard to represent data. SOAP or REST is one of the representative web-services using XML based massage passing systems. The XML parser can be divided into event driven and DOM tree. A streaming parser as an event driven is widely used for high-speed parsing. Since the streaming parser processes XML documents in sequence, they have any limitation to improve system performance. In order to improve speed of streaming XML parser, we present multibyte based streaming XML hardware parser using the element analyzer instead of the state machine. Compared to other parsers, the proposed MStreXHP can achieve about 2.72 times improvement in the number of clock cycles to be consumed in comparison of characters and sustain about 7.8Gbps throughput. Therefore, our MStreXHP is desirable for the streaming XML hardware parser on high-performance systems.
The Design of Skate Fermentation Monitoring System for Consumer Taste Using The Smart RFID Tag
Chung, Sung Boo ; Kim, Joo Woong ; Lee, Wung Gun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 141~146
DOI : 10.5573/ieie.2015.52.9.141
Recently, people are consuming more fermented food for its health benefits. When we think of fermented food, skate comes to mind. However, there are different preferences depending on the degree of fermentation. Thus, if there is a system that shows the degree of the fermentation on skate, people can eat according to their taste. This paper proposes a design of skate fermentation monitoring system for consumer taste using the smart RFID tag. The proposed system consists of the RFID tag,
sensor, reader, and server. In order to confirm the usefulness of the proposed system, we performed experiments on the skate fermentation. The proposed monitoring system can show the skate fermentation at 4 grades: None, Low, Medium, and Strong. With the smart RFID tag, we successfully estimated the skate fermentation.
Structure of Integrated Adaptive Catenary Inspection System for Improved Safety
Kim, Ji-Yoon ; Kim, Jung-Phyung ; Kim, Woo-Saeng ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 9, 2015, Pages 147~152
DOI : 10.5573/ieie.2015.52.9.147
Almost all existing inspection methods for catenary system have relied on dedicated track inspection cars. Two factors make it necessary to modify the conventional method: First, the climate has become increasingly similar to that of a subtropical area. In addition, high speed trains have been developed that can run as fast as 450Km/h. This paper presents a visual catenary inspection system structure that incorporates roadbed information for high-speed running environments. Conventional catenary inspection systems determined the degree of wearing only for the trolley wire. The facility inspection system presented in this paper on the other hand utilizes visual and sound data of inspection targets and adjusts inspection frequency and sensitivity depending on the geographic data.