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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
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Volume 52, Issue 1 - Jan 2015
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Design and Data Analysis of Signal Measurement System for In-Building Propagation Characteristics
Kim, Jeong-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 3~6
DOI : 10.5573/ieie.2015.52.2.003
Recently, the collection of the sensor data and its analysis become important as the smart buildings equipped with the various sensors appear as a usual scene. The interconnection through the wire cable among the sensors is indispensible because of the information collections such as the temperature, the humidity, and the luminance in the rooms and the hallways for the effective management of the in-building energies. However, these interconnections through the cabling will be very costly, time-consuming, and a difficult task since they will cause some damages to the buildings. Therefore, the interconnections through the unwired connections are required in terms of the deployment effectiveness such as time and cost In this paper, the design and the operation appropriateness are confirmed through the simulation of the signal measurement system for in-building propagation characteristics based on signature sequence and the analysis of the collected measurement data is performed thereafter.
Self-Interference Cancellation and Turbo Equalizer Design for the Single-band Full Duplex System using Single Antenna
Choi, Jinkyu ; An, Changyoung ; Ryu, Heung-Gyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 7~17
DOI : 10.5573/ieie.2015.52.2.007
In this paper, we propose a single antenna SSD(simultaneous single band duplex) system using turbo equalizer. The proposed system communicates simultaneously on single band. That is the proposed system is full-duplex system. The proposed system uses balanced feed network circuit to improve isolation in single antenna structure. Also, the proposed system uses RF(radio frequency) cancellation and digital cancellation to cancel self-interference. Additionally, the proposed system uses turbo equalizer to equalize ISI(inter-symbol interference) by harsh multipath fading and to collect bit errors by residual self-interference signals. By using turbo equalizer, the proposed system guarantees QoS(quality of service). In this paper, we uses Simulink simulation program to analyze performance of the proposed system. The simulation results confirm that proposed system can communicate simultaneously by using balanced feed network, RF cancellation, digital cancellation and turbo equalizer in harsh multipath channel on single band.
Estimation of I/Q Imbalance Parameters for Repeater using Direct Conversion RF with Low Pass Filter Mismatch
Yun, Seonhui ; Lee, Kyuyong ; Ahn, Jaemin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 18~26
DOI : 10.5573/ieie.2015.52.2.018
In this paper, we studied the method for analyzing and estimating the parameters that induce I/Q imbalance in the repeater using direct conversion RF. In repeater, amplitude, phase, and filter mismatch are generated in the receiving-end which converts RF signal to baseband signal. And amplitude and phase mismatch are generated in the transmitting-end which converts baseband signal to RF signal. Accordingly, we modeled the parameters that cause I/Q imbalance in the structure of the repeater in order, and proposed a feedback test structure from the transmitting-end to the receiving-end for estimating the corresponding parameters. By comparing the test transmitting signal and received signal, it is possible to estimate the I/Q imbalance parameters which occurred from mixed components of real and imaginary part. And it was confirmed that I/Q imbalance phenomenon has been properly compensated with estimated parameters at the direct conversion RF repeater.
Design and Implementation of Centralized TIS-B Server for Broadcasting Air Traffic Situation
Song, Inseong ; Jang, Eunmee ; Choi, Sangbang ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 27~39
DOI : 10.5573/ieie.2015.52.2.027
As a radar based air surveillance hits the limit along with the growing air traffic needs, a new air surveillance technology called ADS-B has emerged. ADS-B provides more accurate position information with a shorter interval, and aircraft equipped with ADS-B transponders can check each other's location. However not all aircraft are equipped with ADS-B transponders, and aircraft with different ADS-B data links cannot check each other's location. To address these problems a TIS-B service, which broadcasts information that a radar is tracking, and an ADS-R service, which cross-broadcasts information of different ADS-B data links, have been emerged. In this paper, we design and implement a centralized TIS-B server for broadcasting air traffic situation which is capable of providing a TIS-B service and an ADS-R service at the same time. The implemented TIS-B server has been verified with a configured ADS-B ground system, by receiving ADS-B surveillance data and radar surveillance data followed by generating surveillance data for providing a TIS-B service and an ADS-R service and simulating broadcast of those generated surveillance data.
An Analysis on Data Throughput of PicoCast Affected by Piconet Mutual Interference
Chung, Jae-Kyong ; Jeon, Sang-Yeop ; Kim, Myoung Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 40~49
DOI : 10.5573/ieie.2015.52.2.040
PicoCast is a recently proposed short-range wireless communications technology that supports both low rate sensor/control data and high speed data such as voice and video traffic in the personal space, defined by the user-centric space of radius tens of meters, with one unified protocol. When the users are in the same area, personal spaces defined by each user may overlap. Since these PicoCast piconets may simultaneously operate, mutual interference is unavoidable. It is necessary to investigate the effect of mutual interference on data transmission and to conduct research on minimizing the interference among PicoCast devices. In this paper we analyze the effect of mutual interference between PicoCast piconets based on data throughput using OPNET network simulator. We have implemented the PicoCast protocol and measured the average throughput and packet loss rate.
Low Conversion Loss and High Isolation W-band MMIC Mixer Module
An, Dan ; Rhee, Jin-Koo ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 50~54
DOI : 10.5573/ieie.2015.52.2.050
In this paper, we report on a high performance 94 GHz MMIC mixer module using 0.1-um metamorphic high electron mobility transistors (MHEMTs). A modified resistive mixer with a RF amplifier was proposed in this work for low conversion loss and high LO-RF isolation. The MMIC mixer module was fabricated using a MMIC chip and CPW-waveguide transitions. The fabricated mixer chip and module showed a low conversion loss of 6.3 dB and 9.5 dB, and LO-RF isolations of 24.8 and 30.4 dB at 94 GHz, respectively. This results are superior to those of previously W-band (75-110 GHz) MMIC mixers.
Bandwidth Enhancement for a Proximity Coupled Microstrip patch Antenna with an Impedance Matching Network
Kwak, Eun-Hyuk ; Kim, Boo-Gyoun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 55~69
DOI : 10.5573/ieie.2015.52.2.055
Bandwidth enhancement technique for a proximity coupled patch antenna is investigated. The bandwidth and radiation characteristics of a proximity coupled patch antenna with an integrated impedance matching network printed on substrates with various dielectric constants and thicknesses are compared to those of a proximity coupled patch antenna without an impedance matching network. The bandwidth of a proximity coupled patch antenna with an integrated impedance matching network is greatly increased than that of a proximity coupled patch antenna without an impedance matching network without the degradation of radiation characteristics.
Design of Two-Dimensional Resonant Wireless Power Transfer Using 90˚ Phase Shifted Inputs
Kim, Sanghwan ; Seo, Chulhun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 70~74
DOI : 10.5573/ieie.2015.52.2.070
In this paper, two-dimensional resonant transmitter and receiver for WPT is designed and implemented using method that use
phase shifted input power to orthogonal transmitter. Mutual inductance is minimized by using proposed each orthogonal coil of receiver and the method that inputs
phase shifted power is used to radiate magnetic energy into two dimension. This method facilitates two dimensional resonant WPT by solving power efficiency degradation problem according to location in general WPT. The resonance frequency is 6.78 MHz and the distance between transmitting and receiving resonator is 200 mm. The transfer efficiency of the proposed wireless power transfer system is higher than 40 % at all direction.
Design of HF-UHF dual Band Tag Antenna
Yoon, Nanae ; Nam, Havan ; Seo, Chulhun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 75~79
DOI : 10.5573/ieie.2015.52.2.075
In this paper, a dual band antenna with the operating frequency in HF and UHF band was proposed. The antenna structure consists of three spiral turns coil in the bottom side to generate the HF frequency of 13.56 MHz. In the top of the antenna, an inverted-spiral dipole structure is used to create the UHF frequency of 922 MHz. The dual band antenna was optimized to reduce size with
dimension. The antenna presents the omnidirectional characteristic with high gain. To validate the theoretical design, the antenna was simulated using FR-4 substrate and verified the simulation results.
Design and Fabrication of 2mm×2mm sized Piezoresistive Accelerometers
Jeon, Yeon-Hwa ; Kim, Hyeon-Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 83~88
DOI : 10.5573/ieie.2015.52.2.083
In this paper,
sized piezoresistive accelerometers were designed and fabricated. Two kinds of accelerometers with different spring structure are designed. One is an accelerometer with 4 beam spring located in the center of the mass, the other is an accelerometer with 8 beam spring located in the vertices of the mass. The modal analysis of the accelerometers and the structural analysis were performed using ANSYS program. The former has the superior sensitivity characteristics of
and the lower offset drift of
than the latter.
High Efficiency Triple Mode Boost DC-DC Converter Using Pulse-Width Modulation
Lee, Seunghyeong ; Han, Sangwoo ; Kim, Jongsun ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 89~96
DOI : 10.5573/ieie.2015.52.2.089
This paper presents a high efficiency, PSM/DCM/CCM triple mode boost DC-DC converter for mobile application. This device operates at Pulse-Skipping Mode(PSM) when it enters light load, and otherwise operate the operating frequency of 1.4MHz with Pulse-Width Modulation(PWM) mode. Especially in order to improve the efficiency during the Discontinuous-Conduction Mode(DCM) operation period, the reverse current prevention circuit and oscillations caused by the inductor and the parasitic capacitor to prevent the Ringing killer circuit is added. The input voltage of the boost converter ranges from 2.5V ~ 4.2V and it generates the output of 4.8V. The measurement results show that the boost converter provides a peak efficiency of 92% on CCM and 87% on DCM. And an efficiency-improving PWM operation raises the efficiency drop because of transition from PWM to PFM. The converter has been fabricated with a 0.18um Dongbu BCDMOS technology.
Acceleration of FFT on a SIMD Processor
Lee, Juyeong ; Hong, Yong-Guen ; Lee, Hyunseok ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 97~105
DOI : 10.5573/ieie.2015.52.2.097
This paper discusses the implementation of Bruun's FFT on a SIMD processor. FFT is an algorithm used in digital signal processing area and its effective processing is important in the enhancement of signal processing performance. Bruun's FFT algorithm is one of fast Fourier transform algorithms based on recursive factorization. Compared to popular Cooley-Tukey algorithm, it is advantageous in computations because most of its operations are based on real number multiplications instead of complex ones. However it shows more complicated data alignment patterns and requires a larger memory for storing coefficient data in its implementation on a SIMD processor. According to our experiment result, in the processing of the FFT with 1024 complex input data on a SIMD processor, The Bruun's algorithm shows approximately 1.2 times higher throughput but uses approximately 4 times more memory (20 Kbyte) than the Cooley-Tukey algorithm. Therefore, in the case with loose constraints on silicon area, the Bruun's algorithm is proper for the processing of FFT on a SIMD processor.
Robust Start-up Circuit for Low Supply-voltage Reference Generator
Im, Saemin ; Park, Sang-Gyu ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 106~111
DOI : 10.5573/ieie.2015.52.2.106
Since most reference voltage generator circuits have bi-stable characteristics, it is important to employ a proper start-up circuit to operate a reference generator in the desired state. In this paper, we propose a start-up circuit for a low voltage reference generator. This start-up circuit determines the state of the circuit reliably by measuring the current drawn by BJTs in the circuit, which is well-defined in the desired state. To measure the current using CMOS-compatible devices only, a comparator with an internal offset voltage is used. The reliability of the proposed circuit is confirmed by Monte-Carlo simulations of the start-up operation, which show that, with the proposed start-up circuit, the low voltage reference generator starts reliably with supply voltages over 850mV even in the presence of device mismatches.
Design of Low Power and High Speed NCL Gates
Kim, Kyung Ki ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 112~118
DOI : 10.5573/ieie.2015.52.2.112
Conventional synchronous circuits cannot keep the circuit performance, and cannot even guarantee correct operations under the influence of PVT variations and aging effects in the nanometer regime. Therefore, in this paper, a DI (delay insensitive) design based NCL (Null Convention Logic) design methodology with a very simple design structure has been used to design digital systems, which is one of well-known asynchronous design methods robust to various variations and does not require any timing analysis. Because circuit-level structures of conventional NCL gates have weakness of low speed, high area overhead or high wire complexity, this paper proposes a new lNCL gates designed at the transistor level for high-speed, low area overhead, and low wire complexity. The proposed NCL gate libraries have been compared to the conventional NCL gates in terms of circuit delay, area and power consumption using a asynchronous multiplier implemented in dongbu 0.11um CMOS technology.
Effect of Line-Width of Optical Sources on Performance of Spectral Amplitude Coding Optical CDMA Systems
Jhee, Yoon Kyoo ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 119~124
DOI : 10.5573/ieie.2015.52.2.119
In this paper, we analyze the effect of line-width of optical sources on the performance of spectral amplitude coding (SAC) optical code division multiple-access (OCDMA) systems. For a performance analysis we use a symmetric balanced incomplete block design (BIBD) code as the code sequence because we can construct a series of code families by choosing different values of q and m. The ideal BIBD code (m=2) requires narrower line-width than the nonideal BIBD codes when the effective power is large (
). But the nonideal BIBD codes (m>2) need narrower line-width than the ideal BIBD code when
The Study of End-to-end Internet Service Quality Evaluation in Convergence ICT Service Environment
Park, Kyun ; Kang, Sang-Ug ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 127~137
DOI : 10.5573/ieie.2015.52.2.127
Various services such as IPTV(Internet Protocol TV), Internet Telephony are provided through multiple ISPs(Internet Service Providers) as ICT technologies are evolving. This paper suggests that the end-to-end Internet service quality evaluation method, which is optimized for domestic environment based on international standards. The end-to-end service quality determines the quality of IPTV and Internet Telephony services and is critical factor for subjective quality as well. As a result, time delay, jitter and packet loss rate are three elements for the quality evaluation. It is also shown that these factors can be predicted with traditional statistical method by sharing minimum amount of information between ISPs.
Perceptual Contrast based on Distribution of Brightness in CIECAM02 for Mobile Display
Nam, Eui-Won ; Kyung, Wang-Jun ; Ha, Ho-Gun ; Ha, Yeong-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 141~147
DOI : 10.5573/ieie.2015.52.2.141
The contrast of a display is generally evaluated by using the ratio of the minimum luminance to the maximum luminance of the display. However, this contrast ratio is not matched with perceived contrast because it uses only physical characteristic of display without considering human perceptual characteristics. In this paper, the proposed contrast measure that considers perceptually discriminable brightness within the range of display brightness is suggested. First, the range between the minimum and maximum brightness of display in CIECAM02 color space is calculated to measure the length of perceived brightness for the display. Next, brightness ranges which are perceptually same at each brightness level are determined by applying Weber-Fechner ratio and then, the number of brightness values within each brightness range is counted. Finally, perceptually discriminable brightness is defined as the sum of ratio between the number of brightness values in each brightness range and the perceptual contrast length of the display. In the experiments, preference test using various displays with random brightness patches is performed to evaluate perceived contrast. As a result, the proposed measure is more consistent with human perception than the previous contrast measures.
A High-performance Lane Recognition Algorithm Using Word Descriptors and A Selective Hough Transform Algorithm with Four-channel ROI
Cho, Jae-Hyun ; Jang, Young-Min ; Cho, Sang-Bok ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 148~161
DOI : 10.5573/ieie.2015.52.2.148
The examples that used camera in the vehicle is increasing with the growth of the automotive market, and the importance of the image processing technique is expanding. In particular, the Lane Departure Warning System (LDWS) and related technologies are under development in various fields. In this paper, in order to improve the lane recognition rate more than the conventional method, we extract a Normalized Luminance Descriptor value and a Normalized Contrast Descriptor value, and adjust image gamma values to modulate Normalized Image Quality by using the correlation between the extracted two values. Then, we apply the Hough transform using the optimized accumulator cells to the four-channel ROI. The proposed algorithm was verified in 27 frame/sec and
resolution. As a result, Lane recognition rate was higher than the average 97% in day, night, and late-night road environments. The proposed method also shows successful lane recognition in sections with curves or many lane boundary.
Proposing the Methods for Accelerating Computational Time of Large-Scale Commute Time Embedding
Hahn, Hee-Il ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 162~170
DOI : 10.5573/ieie.2015.52.2.162
Commute time embedding involves computing the spectral decomposition of the graph Laplacian. It requires the computational burden proportional to
, not suitable for large scale dataset. Many methods have been proposed to accelerate the computational time, which usually employ the Nystr
m methods to approximate the spectral decomposition of the reduced graph Laplacian. They suffer from the lost of information by dint of sampling process. This paper proposes to reduce the errors by approximating the spectral decomposition of the graph Laplacian using that of the affinity matrix. However, this can not be applied as the data size increases, because it also requires spectral decomposition. Another method called approximate commute time embedding is implemented, which does not require spectral decomposition. The performance of the proposed algorithms is analyzed by computing the commute time on the patch graph.
Development of a Wireless Gamma-ray Probe for Diagnosing and Evaluation of its Effectiveness
Park, Hyemin ; Joo, Koansik ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 173~181
DOI : 10.5573/ieie.2015.52.2.173
We developed a wireless gamma-ray probe based on radiation photon counting method to diagnose and detect remaining lesions after surgery, and its effectiveness was evaluated using calibration sources and a phantom. The probe was designed and miniaturized using a semi-conductor-based radiation sensor, and a Bluetooth remote communication module was used to implement the wireless diagnosis and detection system. Moreover, a remote monitoring system was implemented to monitor affected areas during diagnosis and surgery. To assess the effectiveness of the developed probe in this study, calibration sources
and a chicken breast phantom were used. Furthermore, the probe's detection response to gamma ray was confirmed through evaluation. Its clinical applicability was verified by assessing the response linearity and detection direction according to gamma-ray intensity, as well as the detection efficiency according to the depth of the gamma source in the phantom.
Quantitative Analysis of GBCA Reaction by Mol Concentration Change on MRI Sequence
Jeong, Hyun Keun ; Jeong, Hyun Do ; Kim, Ho Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 182~192
DOI : 10.5573/ieie.2015.52.2.182
In this paper, we introduce how to change the reaction rate as mol concentration when we scan enhanced MRI with GBCA(Gadolinium Based Contrast Agent), Also show the changing patterns depending on diverse MRI sequences which are made by different physical principle. For this study, we made MRI phantom ourselves. We mixed 500 mmol Gadoteridol with Saline in each 28 different containers from 500 to 0 mmol. After that, MR phantom was scanned by physically different MRI sequences which are T1 SE, T2 FLAIR, T1 FLAIR, 3D FLASH, T1 3D SPACE and 3D SPCIR in 1.5T bore. The results were as follows : *T1 Spin echo's Total SI(Signal Intensity) was 15608.7, Max peak was 1352.6 in 1 mmol. *T2 FLAIR's Total SI was 9106.4, Max peak was 0.4 1721.6 in 1 mmol. *T1 FLAIR's Total SI was 20972.5, Max peak was 1604.9 in 1 mmol. *3D FLASH's Total SI was 20924.0, Max peak was 1425.7 in 40 mmol. *3D SPACE 1mm's Total SI was 6399.0, Max peak was 528.3 in 3 mmol. *3D SPACE 5mm's Total SI was 6276.5, Max peak was 514.6 in 2 mmol. *3D SPCIR's Total SI was 1778.8, Max peak was 383.8 in 0.4 mmol. In most sequences, High signal intensity was shown in diluted lower concentration rather than high concentration, And also graph's max peak and pattern had difference value according to the each different sequence. Through this paper which have quantitative result of GBCA's reaction rate depending on sequence, We expect that practical enhanced MR protocol can be performed in clinical field.
A Study on the Noise Improvement of All Digital Phase-Locked Loop Using Time-to-Digital Converter
Ahn, Tae-Won ; Lee, Jongsuk ; Lee, Won-Seok ; Moon, Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 52, issue 2, 2015, Pages 195~200
DOI : 10.5573/ieie.2015.52.2.195
This paper presents SVBS-TDC (Semi-Vernier Binary-Search Time-to-Digital Converter) for the noise improvement of ADPLL (All-Digital Phase Locked Loop. We used a Semi-Vernier BS-TDC (Binary-Search TDC) architecture to improve the operation speed more then 10 times compared with the previous conventional BS-TDC and ensured a 510ps wide input range. The proposed Semi-Vernier BS-TDC was designed in a 65ns CMOS process and the simulation results showed 200MHz speed and 4ps resolution with a 1.2V supply voltage, and considerable noise improvement of ADPLL.