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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Institute of Electronics and Information Engineers
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Journal DOI :
The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 49, Issue 12 - Dec 2012
Volume 49, Issue 11 - Nov 2012
Volume 49, Issue 10 - Oct 2012
Volume 49, Issue 9 - Sep 2012
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An Enhanced MAC Protocol Based on FDD for Reducing The Delay in Visible LAN Systems
Hwang, Junho ; Yoo, Myungsik ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 3~10
DOI : 10.5573/ieek.2012.49.10.003
The visible light communication takes advantages of LED and PD for communication and is considered as a next generation wireless communication technology. It can support variety indoor applications. Especially, Visible LAN service has drawn much attention due to high data rate and no interference with existing WPAN system as well as high efficiency in illumination. However, existing MAC protocol occurs a high communication delay due to uplink collision and backoff time. In this paper, to reduce packet delay, we propose an enhanced MAC protocol based on FDD where the time difference between uplink frame and downlink frame transmission is utilized. Through computer simulations, we verified that the proposed MAC protocol outperforms the existing MAC protocol in terms of average packet delay.
Multi-objective Optimization of Channel Quality and Power Consumption in Visible Light Communication Systems
Dotronghop, Dotronghop ; Hwang, Junho ; Yoo, Myungsik ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 11~17
DOI : 10.5573/ieek.2012.49.10.011
The VLC system undertakes both missions of illumination and wireless communication. It is difficult to design a VLC system with optimal performance due to the trade-offs between power consumption and channel quality. In this paper, the VLC system design problem is solved by using multi-objective optimization method. For optimization, the multi-objective function is formulated with respect to power consumption, received power, and SNR under the constraints on the system variables. Through the multi-objective optimization, it is possible to obtain the solutions that satisfies both minimum power consumption and maximum channel quality.
A Study on The Advanced Altitude Accuracy of GPS with Barometric Altitude Sensor
Kim, Nam-Hyeok ; Park, Chi-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 18~22
DOI : 10.5573/ieek.2012.49.10.018
This paper suggests an altitude determination algorithm using GPS and barometric altitude sensors and evaluates the algorithm by digital map contour. A code based GPS altitude has lots of errors so that the car navigation companies can not use this data. Therefore, altitude is calculated by convergence data with GPS and barometric altitude variance in this paper. The modified altitudes are compared with the digital map contour and then this algorithm's effect is evaluated for the car navigation systems.
A Study of Positioning Error Based on the Satellite Navigation System
Park, Chi-Ho ; Kim, Nam-Hyeok ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 23~33
DOI : 10.5573/ieek.2012.49.10.023
This paper is a study on precise point positioning using global navigation satellite system. This paper studies inherent barriers of global navigation satellite system such as increase in shadowed areas and positioning errors when signals cannot be received due to various environmental factors. It analyzes performance of various receivers, changes in number of satellite and DOP(Dilution of Precision) following changes in environment such as center of a road, side of a road, residential area, high building, and alleys. It also studies changes in positioning error. The objective of this study lies on understanding the range of positioning error following changes in environment and the cause of error, and enhancing the reliability and safety of the global navigation satellite system.
Adaptive Buffer and Burst Scheme and Its Characteristics for Energy Saving in Core IP Networks
Han, Chimoon ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 34~42
DOI : 10.5573/ieek.2012.49.10.034
This paper analyses the energy saving basic power models in core IP networks, and proposes the adaptive buffer and burst scheme which is a possible energy saving method, and its implementation algorithm in core IP networks. Especially this paper describes the adaptive buffer and burst scheme dynamically varying the buffering interval B according to the input traffic volume of ingress router, and explains the operation principle of proposed scheme. This method is to adjust the buffering interval B according to input traffic volume of ingress router, that is increasing the interval B when input traffic volume is low, and decreasing the interval B when input traffic volume is high between some given interval regions. This method can gets the high energy saving effect as decreasing the transition number of idle/active in networks when input traffic volume is low, and decreasing the transition number of idle/active by the continuous of burst packets in transit router when input traffic volume is high. This paper shows the increasing of asleep rate for the energy saving of core IP networks and confirms the energy saving of core IP networks by the computer simulation. We confirmed that proposed method can be save the energy of IP networks by properly trade off network performances.
High PAE Power Amplifier Using Adaptive Bias Control Circuit for Wireless Power Transmission
Hwang, Hyunwook ; Seo, Chulhun ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 43~46
DOI : 10.5573/ieek.2012.49.10.043
In this paper, high efficiency power amplifier is implemented with high gain amplifier. Two-stage amplifier using adaptive bias control circuit improve efficiency at low input power. Fixed bias circuit and adaptive bias circuit both have about 76 % efficiency at maximum power level. However amplifier using an adaptive bias control circuit has 70 % at 6 dBm input power level when the amplifier using fixed bias circuit has 50%. The proposed power amplifier using the adaptive bias control circuit can have high efficiency at lower power level.
Capacity and Secrecy Rate Analysis of a Frequency-Domain Equal-Gain-Combining TR Scheme for Distributed Antenna Systems in Multi-User Multi-Path Fading Channels
Kim, Myoung-Seok ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 47~53
DOI : 10.5573/ieek.2012.49.10.047
Time-reversal (TR) precoding focuses the energy of the effective channel in time and improves receive performance of a single tap receiver. Frequency-domain equal-gain-combining (FD-EGC) TR scheme, which works in linear block precoding fashion, has better temporal focusing performance than the traditional TR. Also, the FD-EGC improves receive performance of minimum mean square error receiver with distributed antenna systems (DAS). The detailed receive performance of the FD-EGC was analyzed in our previous work. In this paper, we focused on capacity analysis of the FD-EGC in DAS. We derived a scaling law which shows how the use of multiple antenna can increase the capacity of the FD-EGC precoding compared with that of no precoding. In addition, we analyze the secrecy rate of the FD-EGC which shows how high-rate messages can be transmitted towards an intended user without being decoded by the other users from the view point of information theoretic security.
Coordinated Precoding With Vector Codebook for Cell Boundary Users of MIMO Interference Channel
Kim, Myoung-Seok ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 54~59
DOI : 10.5573/ieek.2012.49.10.054
Multiple antenna transmission and reception, whose principal merits are significant increase in spectral efficiency and/or reduction in error rate, lose much of their effectiveness in high levels of interference from other cells. Incorporating the other cell interference into advanced signal processing at transmitter and receiver is one of the key challenges for cell boundary users in cellular system. Since receiver can obtain exact knowledge of interference channels more easily than transmitter, an interference-aware multiple antenna receiver that can significantly attenuate interferences is considered. Based on the receiver, codebook-based coordinated precoding schemes are proposed. According to the level of cooperation, centralized and distributed schemes are proposed. We verified by the simulation results that even the distributed schemes, which have same amount of feedback and no cooperation between cells, have performance gain compared to the conventional non-coordinated scheme.
An Adaptive Temporal Suppression for Reducing Network Traffic in Wireless Sensor Networks
Min, Joonki ; Kwon, Youngmi ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 60~68
DOI : 10.5573/ieek.2012.49.10.060
Current wireless sensor networks are considered to support more complex operations ranging from military to health care which require energy-efficient and timely transmission of large amounts of data. In this paper, we propose an adaptive temporal suppression algorithm which exploits a temporal correlation among sensor readings. The proposed scheme can significantly reduce the number of transmitted sensor readings by sensor node, and consequently decrease the energy consumption and delay. Instead of transmitting all sensor readings from sensor node to sink node, the proposed scheme is to selectively transmit some elements of sensor readings using the adaptive temporal suppression, and the sink node is able to reconstruct the original data without deteriorating data quality by linear interpolation. In our proposed scheme, sensing data stream at sensor node is divided into many small sensing windows and the transmission ratio in each window is decided by the window complexity. It is defined as the number of a fluctuation point which has greater absolute gradient than threshold value. We have been able to achieve up about 90% communication reduction while maintaining a minimal distortion ratio 6.5% in 3 samples among 4 ones.
Study of Time Domain Measurement and Analysis Technique Using Network Analyzer for UWB Antenna link Characterization
Koh, Young-Mok ; Kim, Jung-Min ; Kim, Keun-Yong ; Ra, Keuk-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 69~80
DOI : 10.5573/ieek.2012.49.10.069
In this paper, we studied the time-domain measurement and analysis techniques using a network analyzer for characterization UWB antenna link radiating impulse signal. For this purpose, we developed the CZT(Chirp z-Transform) algorithm which has characterized zoom-in function and transformed the acquired data from network analyzer to time domain format. Using the CZT algorithm, we proves that it would be better efficient and more faster than the DFT for analyzing the waveform and also be able to zoom-in the arbitrary region.
A Study on Improving Pitch Search by Varying the number of Subframes for Vocoder
Baek, Geum-Ran ; Bae, Myung-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 83~88
DOI : 10.5573/ieek.2012.49.10.083
The pitch searching is a very important process in a vocoder. Generally, the method of pitch searching method is used by highlighting the periodicity, where a correlation is identified with the signal by changing the interval of two pulses. When the correlation value is highest, the pitch can be found by the pulse interval because it is the repetition interval with most striking period. There are many methods to solve this problem and search the pitch by dividing a frame into many subframes, but there is too much calculation to solve. A method in this paper is suggested to vary the number of subframes by predicting the amplitude change rate in a frame. If this method is applied, the general pitch searching performance will be improved because the accuracy may be enhanced without affecting the sound quality in the synthesized signal after parameter transmission; and the pitch searching time may be reduced.
A Robust DNA Watermarking in Lifting Based 1D DWT Domain
Lee, Suk-Hwan ; Kwon, Ki-Ryong ; Kwon, Seong-Geun ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 91~101
DOI : 10.5573/ieek.2012.49.10.091
DNA watermarking have been interested for both the security of private genetic information or huge DNA storage information and the copyright protection of GMO. Multimedia watermarking has been mainly designed on the basis of frequency domain, such as DCT, DWT, FMT, and so on, for the robustness and invisibility. But a frequency domain watermarking for coding DNA sequence has a considerable constraint for embedding the watermark because transform and inverse transform must be performed without completely changing the amino acid sequence. This paper presents a coding sequence watermarking on lifting based DWT domain and brings up the availability of frequency domain watermarking for DNA sequence. From experimental results, we verified that the proposed scheme has the robustness to until a combination of 10% point mutations, 5% insertion and deletion mutations and also the amino preservation and the security.
Minimum-cost Path Algorithm for Separating Touching English Characters
Lee, Duk-Ryong ; Oh, Il-Seok ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 102~108
DOI : 10.5573/ieek.2012.49.10.102
The paper proposes an algorithm which finds a nonlinear cut path for a printed grayscale touching character image. The conventional algorithms were observed to fail in situations of complicated touching. We analyzed those situations, and based on the analysis results we identified problematic issues of the conventional algorithms. We modified the conventional algorithms in two aspects. First we propose a new penalizing term which is probable to guide correctly the cut path for touching situations difficult to separate. Second the preposed algorithm adopts a strategy of producing both the downward and upward paths and selecting better one. The experimental results on actual touching character images showed that the proposed algorithm was superior th conventional algorithms by 3~4% in terms of success ratio of separation.
The Optimization of
SONOS Flash Memory with Polycrystalline Silicon Thin Film Transistor
Kim, Sang Wan ; Seo, Chang-Su ; Park, Yu-Kyung ; Jee, Sang-Yeop ; Kim, Yun-Bin ; Jung, Suk-Jin ; Jeong, Min-Kyu ; Lee, Jong-Ho ; Shin, Hyungcheol ; Park, Byung-Gook ; Hwang, Cheol Seong ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 111~121
DOI : 10.5573/ieek.2012.49.10.111
In this paper, a poly-Si thin film transistor with
gate length was fabricated and its electrical characteristics are optimized. From the results, it was verified that making active region with larger grain size using low temperature annealing is an efficient way to enhance the subthreshold swing, drain-induced barrier lowering and on-current characteristics. A SONOS flash memory was fabricated using this poly-Si channel process and its performances are analyzed. It was necessary to optimize O/N/O thickness for the reduction of electron back tunneling and the enhancement of its memory operation. The optimized device showed 2.24 V of threshold voltage memory windows which coincided with a well operating flash memory.
Development of a Nano-Electro-Mechanical Memory Simulator
Choi, Woo Young ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 122~127
DOI : 10.5573/ieek.2012.49.10.122
A nano-electro-mechanical (NEM) memory simulator has been developed by using Matlab. The simulator can be used for the prediction of hysterisis curves, applied forces, steady- or transient-state behavior, program/erase energy consumption and potential energy. Predicting NEM memory behavior by simple user interface, the simulator will make the design of NEM memory cells simpler.
A Study on the Fabrication of Integrated Optical Electric-Field Sensor and Performance utilizing Asymmetric
Ha, Jeongho ; Jung, Hongsik ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 128~134
DOI : 10.5573/ieek.2012.49.10.128
The performance evaluation and fabrication of integrated-optic electric-field sensor utilizing
asymmetric Mach-Zehnder intensity modulator with a push-pull lumped electrode and a plate-type probe antenna to measure an electric field strength is described. The modulator has a small device size of
and operates at a wavelength
. The devices are simulated based on the BPM software and fabricated utilizing Ti-diffused
channel optical waveguides. The minimum detectable electric field is 1.02 V/m and 6.91 V/m, corresponding to a dynamic range of ~35 dB and ~10 dB at the frequencies of 500 KHz and 5 MHz, respectively.
BTC Algorithm Utilizing Compression Method of Bitmap and Quantization data for Image Compression
Cho, Moonki ; Yoon, Yungsup ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 135~141
DOI : 10.5573/ieek.2012.49.10.135
To reduce frame memory size usage in LCD overdrive, block truncation coding (BTC) image compression is commonly used. For maximization of compression ratio, BTC image compression is need to compress bitmap or quantization data. In this paper, for high compression ratio, we propose CMBQ-BTC (CMBQ : compression method bitmap data and quantization data) algorithm. Experimental results show that proposed algorithm is efficient as compared with PSNR and compression ratio of the conventional BTC method.
A CMOS Duty Cycle Corrector Using Dynamic Frequency Scaling for Coarse and Fine Tuning Adjustment
Han, Sangwoo ; Kim, Jongsun ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 142~147
DOI : 10.5573/ieek.2012.49.10.142
This paper presents a mixed-mode CMOS duty-cycle corrector (DCC) circuit that has a dynamic frequency scaling (DFS) counter and coarse and fine tuning adjustments. A higher duty-cycle correction accuracy and smaller jitter have been achieved by utilizing the DFS counter that reduces the bit-switching glitch effect of a digital to analog converter (DAC). The proposed circuit has been designed using a 0.18-
CMOS process. The measured duty cycle error is less than
for a wide input duty-cycle range of 25-75% over a wide freqeuncy range of 0.5-1.5 GHz.
Incremental Delta-Sigma Analog to Digital Converter for Sensor
Jeong, Jinyoung ; Choi, Danbi ; Roh, Jeongjin ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 148~158
DOI : 10.5573/ieek.2012.49.10.148
This paper presents the design of the incremental delta-sigma ADC. The proposed circuit consists of pre-amplifier, S & H circuit, MUX, delta-sigma modulator, and decimation filter. Third-order discrete-time delta-sigma modulator with 1-bit quantization were fabricated by a
CMOS technology. The designed circuit show that the modulator achieves 87.8 dB signal-to-noise and distortion ratio (SNDR) over a 5 kHz signal bandwidth and differential nonlinearity (DNL) of
LSB, integral nonlinearity (INL) of
LSB. Power consumption of delta-sigma modulator is
. It was decided that N cycles are 200 clock for 16-bits output.
W-band Single-chip Receiver MMIC for FMCW Radar
Lee, Seokchul ; Kim, Youngmin ; Lee, Sangho ; Lee, Kihong ; Kim, Wansik ; Jeong, Jinho ; Kwon, Youngwoo ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 159~168
DOI : 10.5573/ieek.2012.49.10.159
In this paper, a W-band single-chip receiver MMIC for FMCW(Frequency-modulated continuous-wave) radar is presented using
GaAs pHEMT technology. The receiver MMIC consists of a 4-stage low noise amplifier(LNA), a down-converting mixer and a 3-stage LO buffer amplifier. The LNA is designed to exhibit a low noise figure and high linearity. A resistive mixer is adopted as a down-converting mixer in order to obtain high linearity and low noise performance at low IF. An additional LO buffer amplifier is also demonstrated to reduce the required LO power of the W-band mixer. The fabricated W-band single-chip receiver MMIC shows an excellent performance such as a conversion gain of 6.2 dB, a noise figure of 5.0 dB and input 1-dB compression point(
) of -12.8 dBm, at the RF frequency of
GHz, LO input power of -1 dBm and IF frequency of 100 MHz.
A Reconfigurable Spatial Moving Average Filter in Sampler-Based Discrete-Time Receiver
Cho, Yong-Ho ; Shin, Soo-Hwan ; Kweon, Soon-Jae ; Yoo, Hyung-Joun ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 169~177
DOI : 10.5573/ieek.2012.49.10.169
A non-decimation second-order spatial moving average (SMA) discrete-time (DT) filter is proposed with reconfigurable null frequencies. The filter coefficients are changeable, and it can be controlled by switching sampling capacitors. So, interferers can be rejected effectively by flexible nulls. Since it operates without decimation, it does not change the sample rate and aliasing problem can be avoided. The filter is designed with variable weight of coefficients as
varies from 1 to 2. This corresponds to the change of null frequencies within the range of fs/3~fs/2 and fs/2~2fs/3. The proposed filter is implemented in the TSMC 0.18-
CMOS process. Simulation shows that null frequencies are changeable in the range of 0.38~0.49fs and 0.51~0.62fs.
Design of Robust and Non-fragile
Kalman-type Filter for System with Parameter Uncertainties: PLMI Approach
Kim, Joon Ki ; Yang, Seung Hyeop ; Bang, Kyung Ho ; Park, Hong Bae ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 181~186
DOI : 10.5573/ieek.2012.49.10.181
In this paper, we describe the synthesis of robust and non-fragile Kalman filter design for a class of uncertain linear system with polytopic uncertainties and filter gain variations. The sufficient condition of filter existence, the design method of robust non-fragile filter, and the measure of non-fragility in filter are presented via LMIs(Linear Matrix Inequality) technique. And the obtained sufficient condition can be represented as PLMIs(parameterized linear matrix inequalities) that is, coefficients of LMIs are functions of a parameter confined to a compact set. Since PLMIs generate infinite LMIs, we use relaxation technique, find the finite solution for robust non-fragile filter, and show that the resulting filter guarantees the asymptotic stability with parameter uncertainties and filter fragility. Finally, a numerical example will be shown.
Study of The Amorphous Selenium (a-Se) using 2-dimensional Device Simulator
Kim, Si-Hyoung ; Kim, Chang-Man ; Nam, Ki-Chang ; Kim, Sang-Hee ; Song, Kwang-Soup ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 187~193
DOI : 10.5573/ieek.2012.49.10.187
Digital X-ray image detector has been applied for medical and industrial fields. Photoconductors have been used to convert the X-ray energy to electrical signal on the direct digital X-ray image detector and amorphous selenium (a-Se) has been used as a photoconductor, normally. In this work, we use 2-dimensional device (2-D) simulator to study about physical phenomena in the a-Se, when we irradiate electromagnetic radiation (
) on the a-Se surface. We evaluate the electron-hole generation rate, electron-hole recombination rate, and electron/hole distribution in the a-Se using 2-D simulator. This simulator divides the device into triangle and calculates using interpolation method. This simulation method has been proposed for the first time and we expect that it will be applied for the development of digital X-ray image detector.
Development of RF Stimulating Protocol for Effective Heat-Stimulus in Subcutaneous Tissue
Myoung, Hyoun Seok ; Lee, Dae Won ; Kim, Han Sung ; Lee, Kyoung Joung ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 194~201
DOI : 10.5573/ieek.2012.49.10.194
Moxibustion is utilized not only to cure disease but also to increase immunity. However, it may lead to undesired effects including severe pains(blisters and burns) because of the difficulty of controlling heat intensity. To overcome these problems we developed the RF heat stimulation system which can control stimulus. Also, we developed the RF stimulation protocol for effective heat transfer in subcutaneous tissue of rabbit. RF stimulator consists of a medical RF capacitive heating device, isolation probe, isolation plate, negative pressure control part and temperature measurement part. For the designed stimulus protocol, we measured the temperature distribution on epidermis and in subcutaneous(5mm, 10mm) area of rabbit during moxibustion. A stimulation protocol was designed by controlling the ON/OFF duty ratio, repeating number, and energy of applied pulse to get the temperature distribution similar with that by moxibustion. In results, the correlation coefficients between temperature distribution by moxibustion and that of stimulator were 95% and 91% from 5mm and 10mm thick respectively. However, temperature distribution on epidermis by stimulator was remarkably lower than that of the moxibustion. Finally, the RF stimulation system showed that it can not only transfer effectively heat similar with moxibustion to the subcutaneous area, but also the influence by unwanted side effects can be minimized.
Development of Time Varying Kalman Smoother for Extracting Fetal ECG using Independent Component Analysis : Preliminary Study
Lee, Chung Keun ; Kim, Bong Soo ; Kwon, Ja Young ; Choi, Young Deuk ; Song, Kwang Soup ; Nam, Ki Chang ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 202~208
DOI : 10.5573/ieek.2012.49.10.202
Fetal heart rate monitoring is important information to assess fetal well-being. Non-invasive fetal ECG (electrocardiography) can be derived from maternal abdominal signal. And various promising signal processing methods have been introduced to extract fetal ECG from mother's composite abdominal signal. However, non-invasive fetal ECG monitoring still has not been widely used in clinical practice due to insufficient reliable measurement and difficulty of signal processing. In application of signal processing method to extract fetal ECG, it might be lower signal to noise ratio due to time varying white Gaussian noise. In this paper, time varying Kalman smoother is proposed to remove white noise in fetal ECG and its feasibility is confirmed. Wiener process was set as Kalman system model and covariance matrix was modified according to white Gaussian noise level. Modified error covariance matrix changed Kalman gain and degree of smoothness. Optimal covariance matrix according to various amplitude in Gaussian white noise was extracted by 5 channel fetal ECG model, and feasibility of proposed method could be confirmed.
Target Tracking Using Image Features in a Cluttered Environment
Jung, Young-Hun ; Kwak, Dong-Min ; Kim, Do-Jong ; Ko, Jung-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 209~216
DOI : 10.5573/ieek.2012.49.10.209
In this paper, we propose a novel tracking method which uses image features consisted of the area, average intensity, aspect ratio of a target image for the real-time IR surveillance system. The image features of the ground target can be modeled as a random process with exponential autocorrelation function mathematically. Finally, we derived a discrete target dynamic equation including kinematic states and geometric states of the target. Simulation results shows that the performance of the proposed method is better than that of the previous tracking method.
A Study on Architecture of Test Program based UML
Kim, ByoungYong ; Jang, JungSu ; Ban, ChangBong ; Lee, HyoJong ; Yang, SeungYul ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 217~230
DOI : 10.5573/ieek.2012.49.10.217
This paper propose interacting test programming methods between test equipment and hardware unit to verify function and performance of the hardware unit under test. Proposed test program can minimizes the risk of failures when the unit is mounted on the aircraft by testing and verifying the unit under the worst stress condition. Also, Object oriented design using UML make it easy to apply in other equipments. Test program consists of architecture package and hardware package. Architecture package is in a role for system management, log analysis, message receiving and message analysis. Messages that are used by system management define messages for testing and defined messages is sent and received to test equipment through Ethernet. Hardware package is in a role for hardware management that is needed to be tested and is related to a system. Hardware to be tested is divided into internal test and transmission test. Internal test inspects hardware itself and reports the test results to the test equipment. Transmission test inspects communication device by sending or receiving data. All kinds of test is done in the worst condition of the test unit executing in parallel. Each device is tested at least 482 times and at most 15,003 times about one hour. Test program is utilized in hardware reliability test like as environmental test or EMI test.
A Research into a Device for Measuring the Electric Power Quality and the Harmonic Frequency
Oh, Kyutae ; Yoo, Youngkil ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 233~239
DOI : 10.5573/ieek.2012.49.10.233
The harmonic frequency occurred in a power system causes errors and failures of equipments such as motors, and an unnecessary power consumption. The fundamental countermeasure for the harmonic frequency is to eliminate the cause of the harmonic frequency. This paper describes about making the device to figure out the cause in real time, verifying the operation of the device, and utilizing it to various power quality measurements. The power usually has the line frequency between 45Hz and 66Hz. In this research, the number of the harmonic frequencies which can be analysed inside the 2.8kHz bandwidth, the filter bandwidth of ADE7880, is 2800/f, and the maximum is 2800/45 = 63. The maximum order of the harmonic frequency in Korea, which has the line frequency of 60Hz, was measured as 2800/60 = 46th. Also, the accuracy of the voltage, current, and power measurement had the error within 0.1%, confirming that it is very precise.
Investigating The Structural Relationships Among Perceived isolation, Organizational Support, Satisfaction and Consistency in Cyber University
Joo, YoungJu ; Chung, AeKyung ; Yoo, NaYeon ; Yi, SangHoi ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 240~250
DOI : 10.5573/ieek.2012.49.10.240
For this study, 373 students of H cyber university were chosen to conduct a survey in the spring semester of 2011. The result of this study through structural equation modeling analysis was as follows: First, organizational support significantly affected perceived isolation. Second, organizational support and perceived isolation significantly affected satisfaction. Third, perceived isolation and satisfaction significantly affected learning persistence, while organizational support didn't. In addition, satisfaction was verified as a mediating variable between organizational support, satisfaction, and learning persistence, and satisfaction was verified as a mediating variable between perceived isolation, organizational support and learning persistence. These results imply that perceived isolation and organizational support should be considered for the design and development strategies of instructional courses in order to enhance satisfaction and learning persistence of students in cyber educational environment.
System Developing for the module of Mobile Broadcast on the Android Platform
Kim, Young Sun ; Lee, Byung Sun ;
Journal of the Institute of Electronics and Information Engineers, volume 49, issue 10, 2012, Pages 251~256
DOI : 10.5573/ieek.2012.49.10.251
Expand the market because the size of the huge funds administered by the conversion of over-the-air digital TV broadcasts in the current situation is likely to be reduced due to the influence of the media over-the-air broadcasts new paid media, digital cable TV and IPTV new mobile TV as a new growth engineis required. Broadcasting system to increase the supply and demand of the module from the ATSC-M/H DMB business existing in the domestic over-the-air broadcasters, has seen significant achievements in sleep technology with the introduction is expected. ATSC-M/H does not require a separate frequency allocation for mobile services does not interfere with the existing ATSC system simulcast, which can be performed on Android mobile handsets American-style mobile broadcast reception module to develop should. This paper is to design the software modules in the broadcasting module embedded systems that are applied on the Android platform, broadcasting from mobile handsets to see.