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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 50, Issue 12 - Dec 2013
Volume 50, Issue 11 - Nov 2013
Volume 50, Issue 10 - Oct 2013
Volume 50, Issue 9 - Sep 2013
Volume 50, Issue 8 - Aug 2013
Volume 50, Issue 7 - Jul 2013
Volume 50, Issue 6 - Jun 2013
Volume 50, Issue 5 - May 2013
Volume 50, Issue 4 - Apr 2013
Volume 50, Issue 3 - Mar 2013
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Volume 50, Issue 1 - Jan 2013
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Advanced Sensor Communication Algorithm based on IEEE 802.15.4/ZigBee for High Speed Train Environment
Moon, Sangmi ; Kim, Bora ; Malik, Saransh ; Kim, Daejin ; Kim, Cheolsung ; Hwang, Intae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 3~12
DOI : 10.5573/ieek.2013.50.10.003
Wireless Sensor Network (WSN) is used in the railway field in terms of efficient management and maintenance. Sensor communication technology based on IEEE 802.15.4/ZigBee is used in low speed train. However, it is difficult to apply in the high speed train that exposed to severe wireless channel environments. In this paper, we propose the sensor communication algorithm for high speed train environment. we improve error rate and throughput using Equalizer, Multiple Input Multiple Output (MIMO), Flexible Spreading Factor (SF) and Modulation. Also, we have analyzed the performance of the IEEE 802.15.4/ZigBee based on the standard of physical layer of 2.4GHz band in each algorithms. Simulation results show that proposed algorithms can improve error rate and throughput of conventional system.
SEAMCAT Based Interference Evaluation Tool with 3D Terrain Display
Park, Sang Joon ; Jeon, Jun Young ; Lim, Chang Heon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 13~20
DOI : 10.5573/ieek.2013.50.10.013
Currently, SEAMCAT has been widely used as a tool to evaluate the effects of interference among wireless communication systems. In the previous work, we have incorporated the ITU-R P.526 pathloss model to the existing SEAMCAT in order to support the capability of interference evaluation taking into account any specific terrain characteristics. Along with this, we have implemented a terrain display function based on the Google map. However, the two-dimensional Google map based display is not effective in helping users to figure out some terrain features including the elevation variation in a given region. In order to alleviate this difficulty, we have incorporated the three-dimensional terrain display using the API of the Google earth to the existing SEAMCAT and provided the capability of viewing the positions of the associated communication systems, the variation of the carrier intensity and interference intensity in location, shadow region indication, and line-of-sight analysis and presented an example of interference evaluation.
Policy-Based Identity Authentication and Transmission Architecture for Highly Reliable Emergency Bio-Data Management in Wireless Mesh Network for U-Healthcare
Chun, Seung-Man ; Woo, Yeung-Kyung ; Park, Jong-Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 21~29
DOI : 10.5573/ieek.2013.50.10.021
This paper proposed the architecture of the authentication and the transmission for high reliable emergency data management based on U-healthcare wireless mesh networks. In U-healthcare monitoring service, the high reliable bio data management as well as the data transmission are required because the monitoring emergency bio data is related linked to life. More specifically, the technologies of the identity authentication of the measuring bio data, the personalized emergency status diagnosis who is authenticated the bio data and the emergency data transmission are important first of all. To do this, this paper presents the structure and protocol of the identity authentication management with using the extended IEEE 11073 PHD, the structure of policy-based management of the emergency bio data for the highly reliable management and the resilient routing protocol based on wireless mesh network for the reliable data transmission.
A Golden Coded-Spatial Modulation MIMO System
Park, Myung Chul ; Han, Dong Seog ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 31~40
DOI : 10.5573/ieek.2013.50.10.031
In this paper, the spatial modulation (SM) multi-input multi-output (MIMO) system is proposed for indoor wireless local area networks (WLANs) with improved spectral efficiency. SM is suitable for high speed WLANs with avoiding the inter channel interference (ICI). Only one transmit antenna is activated in SM at each symbol interval. Therefore, it fails to attain the maximum coding gain of MIMO. The space time block code (STBC)-SM MIMO system can attain the maximum diversity gain at the expense of spectral efficiency. The proposed Golden-SM MIMO system uses the Golden code to improve the coding gain and spectral efficiency at the same time. The Golden code is adapted for STBC-SM and it makes the new code book for transmission symbols. The performance of the proposed system is compared with the conventional systems with computer simulations.
Millimeter-Wave Dielectric Resonator Antennas for the Anti-Collision Car Radar System
Park, Young Bon ; Jung, Young Ho ; Seok, Chang Heon ; Lee, Mun Soo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 41~49
DOI : 10.5573/ieek.2013.50.10.041
This paper suggests the dielectric resonator antenna using LTCC process for mm-wave car radar system. In this paper, dielectric resonator antennas (DRA) operated in 76-77 GHz frequency band are designed. And, using the LTCC process, the structures of dielectric resonator with SRR (split ring resonator) inside and those of dielectric resonator with probe inside are suggested. Linear polarization antennas and circular polarization antenna are designed for the DRA with probe inside. Three kinds of the DRA antennas are designed and their characteristics are calculated using CST RF simulation tool. The designed antennas are fabricated and measured and the measured results are compared with calculated results. The measured operating frequencies of DRAs are within 76 GHz to 77 GHz, which are close to the calculated results, and the measured gains are about 8.15 dBi to 10.82 dBi.
Secure Cluster Head Elections Based on Trust for Wireless Sensor Networks
Wang, Gicheol ; Cho, Gihwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 50~64
DOI : 10.5573/ieek.2013.50.10.050
In clustered sensor networks, since a CH (Cluster Head) collects data from its members and delivers the collected data to the sink, it is very important to prevent compromised nodes from joining a CH election and manipulating and fabricating the election result. In order to protect CH elections from compromised nodes, unpredictability, non-manipulability, and agreement property should be guaranteed in CH elections. However, existing CH election schemes cannot prevent intelligent compromised nodes from skilfully violating those properties via their cooperation. In this paper, we propose a scheme which protects the CH election process by detecting intelligent compromised nodes and excluding them. For every CH election round, each member gives a direct trust value to other members according to their behavior. Then a real reputation value is given to each member by combining the direct trust value and indirect trust values provided by other members. Then, each node evaluates the real reputation values of members in its cluster and excludes some untrustable nodes from CH candidates. The scheme greatly improves the non-manipulability and agreement property of CH election results compared to other rival schemes. Furthermore, the scheme preserves the high non-manipulability and the high agreement property even in an environment where message losses can happen.
Modeling of Parasitic Source/Drain Resistance in FinFET Considering 3D Current Flow
An, TaeYoon ; Kwon, Kee-Won ; Kim, SoYoung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 67~75
DOI : 10.5573/ieek.2013.50.10.067
In this paper, an analytical model is presented for the source/drain parasitic resistance of FinFET. The parasitic resistance is a important part of a total resistance in FinFET because of current flow through the narrow fin. The model incorporates the contribution of contact and spreading resistances considering three-dimensional current flow. The contact resistance is modeled taking into account the current flow and parallel connection of dividing parts. The spreading resistance is modeled by difference between wide and narrow and using integral. We show excellent agreement between our model and simulation which is conducted by Raphael, 3D numerical field solver. It is possible to improve the accuracy of compact model such as BSIM-CMG using the proposed model.
A DPLL with a Modified Phase Frequency Detector to Reduce Lock Time
Hasan, Md. Tariq ; Choi, GoangSeog ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 76~81
DOI : 10.5573/ieek.2013.50.10.076
A new phase frequency detector based digital phase-locked loop (PLL) of 125 MHz was designed using the 130 nm CMOS technology library consisting of inverting edge detectors along with a typical digital phase-locked loop to reduce the lock time and jitter for mid-frequency applications. XOR based inverting edge detectors were used to obtain a transition earlier than the reference signal to change the output more quickly. The HSPICE simulator was used in a Cadence environment for simulation. The performance of the digital phase-locked loops with the proposed phase frequency detector was compared with that of conventional phase frequency detector. The PLL with the proposed detector took
to lock with a maximum jitter of approximately 0.1142 ns, whereas the conventional PLL took a minimum of
to lock with a maximum jitter of approximately 0.1245 ns.
A Minimum Wavelength Assignment Technique for Wavelength-routed Optical Network-on-Chip
Kim, Youngseok ; Lee, Jae Hun ; Cui, Di ; Han, Tae Hee ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 82~90
DOI : 10.5573/ieek.2013.50.10.082
An Optical Network-on-Chip(ONoC) based on silicon photonics is one of promising technology for next generation exascale computing architectures. Recent active researches on ONoC focus on improving bandwidth further and avoiding path collisions by using wavelength division multiplexing (WDM). However, the number of wavelengths used for the WDM increases linearly as the number of Processing Element (PE) increases in existing ONoCs which adopt centralized routing architecture. The problem will also arises growing cost of optical devices such as light switches and light sources and limits the scalability of ONoC due to the sinal loss caused by interference of distinct light sources. In this paper, we proposes a distributed routing architecture for ONoC which is based on 2D-mesh structure using WDM technique and present a method that minimize the required number of wavelengths exploiting the connectivity of communication. In comparison with existing centralized routing architectures, results show reduction by 56% of the number of wavelengths and 21% of the number of optical switches in
Design of a Current Steering 10-bit CMOS D/A Converter Based on a Self-Calibration Bias Technique
Lim, ChaeYeol ; Lee, JangWoo ; Song, MinKyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 91~97
DOI : 10.5573/ieek.2013.50.10.091
In this paper, a current steering 10-bit CMOS D/A converter to drive a NTSC/PAL analog TV is proposed. The proposed D/A converter has a 50MS/s operating speed with a 6+4 segmented type. Further, in order to minimize the device mismatch, a self-calibration bias technique with a fully integrated termination resistance is discussed. The chip has been fabricated with a 3.3V 0.11um 1-poly 6-metal CMOS technology. The effective chip area is
and power consumption is about 88mW. The experimental result of SFDR is 63.1dB, when the input frequency is 1MHz at the 50MHz of sampling frequency.
UWB WBAN Receiver for Real Time Location System
Ha, Jong Ok ; Park, Myung Chul ; Jung, Seung Hwan ; Eo, Yun Seong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 98~104
DOI : 10.5573/ieek.2013.50.10.098
This paper presents a WBAN UWB receiver circuit for RTLS(real time location system) and wireless data communication. The UWB receiver is designed to OOK modulation for energy detection. The UWB receiver is designed for sub-sampling techniques using 4bit ADC and DLL.The proposed UWB receiver is designed in
CMOS and consumes 61mA with a 1.8V supply voltage. The UWB receiver achieves a sensitivity of -85.7 dBm, a RF front-end gain of 42.1 dB, a noise figure of 3.88 dB and maximum sensing range of 4 meter.
Improved u-Healthcare Service Authentication Protocol based on RFID Technology
Ahn, Hae-Soon ; Yoon, Eun-Jun ; Bu, Ki-Dong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 107~115
DOI : 10.5573/ieek.2013.50.10.107
Recently, the RFID technology is combined with a u-healthcare services is an emerging trend in the field of medical services. u-healthcare service, as covering the field of personal health information beyond the level of simple health screening and treatment of life are closely related. Considering security, invasion of privacy, as well as life may be threatened even if your personal health information to be exposed or exploited illegally u-Healthcare services certification is essential. In 2012, Jeong proposed J-L patient authentication protocol that Initialization process, and patients using RFID technology separates the certification process. Jeong, such as the claim that the proposed protocol for reuse attacks, spoofing attacks, prevent information disclosure and traceability fire safety, but raises issues of security and operations efficiency. Therefore, in this paper, Jeong, such as the security of the proposed protocol and to prove the computational efficiency issues, and to enhance the safety and efficiency of RFID technology based on practical u-Healthcare services authentication protocol is proposed.
Reliable Transmission of Bio-Data for IEEE 11073 PHD Standards at 6LoWPAN Multi-Hop Wireless Sensor Networks
Woo, Yeon Kyung ; Park, Jong Tae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 116~123
DOI : 10.5573/ieek.2013.50.10.116
In mobile healthcare applications, the reliable transmission of the bio-data is very important. In this article, we present a reliable bio-data transmission technique for mobile healthcare monitoring service at 6LoWPAN multi-hop wireless networks. In particular, we expand IEEE 11073-20601 protocol, and propose the reliable path construction for 6LoWPAN aimed to reliably provide mobile healthcare service over wireless sensor network, using IPv6 network. 6LoWPAN is recognized possibility because it is agree with sensor network by raising Adaptation layer on the MAC layer to transmit IPv6 packets. In this article proposed minimize the algorithm complexity and reliability routing protocol because the 6LoWPAN devices are suitable for low cost, small size and battery that can be used to health care system environment. And detailed procedures and algorithms are presented. We the proposed method to prove the superiority of using NS-3 for compareing with AODV protocol.
Scanning System Method for Calculating Ion Flux in Plasma Etching Simulation
Shin, Sung-Sik ; Yu, Dong-Hun ; Gwun, Ou-Bong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 124~131
DOI : 10.5573/ieek.2013.50.10.124
The most important thing in Plasma simulation is the etching process in which etch rate is calculated based on feature profile. Although there are various components to consider in calculating etch rate such as Ion Flux, Neutral, gas, and temperature, Addressing of this paper is limited to Ion Flux. This paper propose a scan method to compute Ion Flux faster for Plasma simulation. Also, this paper experiments and compares generally used Monte Carlo method and the proposed method based on gaussian and cosine distribution. Lastly, this paper proves that the proposed method can calculate accurate Ion Flux more efficiently than Monte Carlo method.
A Design of Embedded LED Display Board Module and Control Unit which the Placement of Pixels is Free
Lee, Bae-Kyu ; Kim, Jung-Hwa ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 135~141
DOI : 10.5573/ieek.2013.50.10.135
In this paper, we installed three high brightness red, green, and blue LED in one socket and made one pixel unit. And we also developed the full-color display board module and control unit which can express various images such as text, graphics, video image with the combination of pixel units and a number of modules. LED display driver module have a driver circuit within the combination of the RGB pixel dot on unit area. These modules of the existing form can be high priced because of implementation a fixed resolution in specific space and installation space. To overcome these shortcomings, we developed a LED driver and LED pixel modules free in array at random pitch intervals. Display board module of this paper enabled to display smoothly video image which have many data processing quantity through dragging data speed up 36 frames per second. Also there are an effect which is provided more clear image because of improving the flickering of the existing display board.
Spectral Reflectance Estimation based on Similar Training Set using Correlation Coefficient
Yo, Ji-Hoon ; Ha, Ho-Gun ; Kim, Dae-Chul ; Ha, Yeong-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 142~149
DOI : 10.5573/ieek.2013.50.10.142
In general, a color of an image is represented by using red, green, and blue channels in a RGB camera system. However, only information of three channels are limited to estimate a spectral reflectance of a real scene. Because of this, the RGB camera system can not accurately represent the color. To overcome this limitation and represent an accurate color, researches to estimate the spectral reflectance by using a multi-channel camera system are being actively proceeded. Recently, a reflectance estimation method adaptively constructing a similar training set from a traditional training set according to a camera response by using a spectral similarity was introduced. However, in this method, an accuracy of the similar training set is reduced because the spectral similarity based on an average and a maximum distances was applied. In this paper, a reflectance estimation method applied a spectral similarity based on a correlation coefficient is proposed to improve the accuracy of the similar training set. Firstly, the correlation coefficient between the similar training set and the spectral reflectance obtained by Wiener estimation method is calculated. Secondly, the similar training set is constructed from the traditional training set according to the correlation coefficient. Finally, Wiener estimation method applied the similar training set is performed to estimate the spectral reflectance. To evaluate a performance of the proposed method with previous methods, experimental results are compared. As a result, the proposed method showed the best performance.
High-resolution 3D Object Reconstruction using Multiple Cameras
Hwang, Sung Soo ; Yoo, Jisung ; Kim, Hee-Dong ; Kim, Sujung ; Paeng, Kyunghyun ; Kim, Seong Dae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 150~161
DOI : 10.5573/ieek.2013.50.10.150
This paper presents a new system which produces high resolution 3D contents by capturing multiview images of an object using multiple cameras, and estimating geometric and texture information of the object from the captured images. Even though a variety of multiview image-based 3D reconstruction systems have been proposed, it was difficult to generate high resolution 3D contents because multiview image-based 3D reconstruction requires a large amount of memory and computation. In order to reduce computational complexity and memory size for 3D reconstruction, the proposed system predetermines the regions in input images where an object can exist to extract object boundaries fast. And for fast computation of a visual hull, the system represents silhouettes and 3D-2D projection/back-projection relations by chain codes and 1D homographies, respectively. The geometric data of the reconstructed object is compactly represented by a 3D segment-based data format which is called DoCube, and the 3D object is finally reconstructed after 3D mesh generation and texture mapping are performed. Experimental results show that the proposed system produces 3D object contents of
resolution with a rate of 2.2 seconds per frame.
An Efficient Pedestrian Recognition Method based on PCA Reconstruction and HOG Feature Descriptor
Kim, Cheol-Mun ; Baek, Yeul-Min ; Kim, Whoi-Yul ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 162~170
DOI : 10.5573/ieek.2013.50.10.162
In recent years, the interests and needs of the Pedestrian Protection System (PPS), which is mounted on the vehicle for the purpose of traffic safety improvement is increasing. In this paper, we propose a pedestrian candidate window extraction and unit cell histogram based HOG descriptor calculation methods. At pedestrian detection candidate windows extraction stage, the bright ratio of pedestrian and its circumference region, vertical edge projection, edge factor, and PCA reconstruction image are used. Dalal's HOG requires pixel based histogram calculation by Gaussian weights and trilinear interpolation on overlapping blocks, But our method performs Gaussian down-weight and computes histogram on a per-cell basis, and then the histogram is combined with the adjacent cell, so our method can be calculated faster than Dalal's method. Our PCA reconstruction error based pedestrian detection candidate window extraction method efficiently classifies background based on the difference between pedestrian's head and shoulder area. The proposed method improves detection speed compared to the conventional HOG just using image without any prior information from camera calibration or depth map obtained from stereo cameras.
Gesture Recognition Using Zernike Moments Masked By Duel Ring
Park, Jung-Su ; Kim, Tae-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 171~180
DOI : 10.5573/ieek.2013.50.10.171
Generally, when we apply zernike moments value for matching, we can use those moments value obtained from projecting image information under circumscribed circle to zernike basis function. However, the problem is that the power of discrimination can be reduced because hand images include lots of overlapped information due to its special characteristic. On the other hand, when distinguishing hand poses, information in specific area of image information except for overlapped information can increase the power of discrimination. In this paper, in order to solve problems like those, we design R3 ring mask by combining image obtained from R2 ring mask, which can weight information of the power of discrimination and image obtained from R1 ring mask, which eliminate the overlapped information. The moments which are obtained by R3 ring mask decrease operational time by reducing dimension through principle component analysis. In order to confirm the superiority of the suggested method, we conducted some experiments by comparing our method to other method using seven different hand poses.
A Study on Voice Activity Detection Using Auditory Scene and Periodic to Aperiodic Component Ratio in CASA System
Kim, Jung-Ho ; Ko, Hyung-Hwa ; Kang, Chul-Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 181~187
DOI : 10.5573/ieek.2013.50.10.181
When there are background noises or some people speaking at the same time, a human's auditory sense has the ability to listen the target speech signal with a specific purpose through Auditory Scene Analysis. The CASA system with human's auditory faculty system is able to segregate the speech. However, the performance of CASA system is reduced when the CASA system fails to determine the correct position of the speech. In order to correct the error in locating the speech on the CASA system, voice activity detection algorithm is proposed in this paper, which is a combined auditory scene analysis with PAR(Periodic to Aperiodic component Ratio). The experiments have been conducted to evaluate the performance of voice activity detection in environments of white noise and car noise with the change of SNR 15~0dB. In this paper, by comparing the existing algorithms (Pitch and Guoning Hu) with the proposed algorithm, the accuracy of the voice activity detection performance has been improved as the following: improvement of maximum 4% at SNR 15dB and maximum 34% at SNR 0dB for white noise and car noise, respectively.
Design of FIR Halfband Filters using Generalized Lagrange Polynomial
Bong, Jeongsik ; Jeon, Joonhyeon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 188~198
DOI : 10.5573/ieek.2013.50.10.188
Maximally flat (MAXFLAT) half-band filters usually have wider transition band than other filters. This is due to the fact that the maximum possible number of zeros at
is imposed, which leaves no degree of freedom, and thus no independent parameters for direct control of the frequency response. This paper describes a novel method for the design of FIR halfband filters with an explicit control of the transition-band width. The proposed method is based on a generalized Lagrange halfband polynomial (g-LHBP) with coefficients parametizing a 0-th coefficient
, and allows the frequency response of this filter type to be controllable by adjusting
is modeled as a steepness parameter of the transition band and this is accomplished through theoretically analyzing a polynomial recurrence relation of the g-LHBP. This method also provides explicit formulas for direct computation of design parameters related to choosing a desired filter characteristic (by trade-off between the transition-band sharpness and passband & stopband flatness). The examples are shown to provide a complete and accurate solution for the design of such filters with relatively sharper transition-band steepness than MAXFLAT half-band filters.
Optimized Implementation of Interpolation Filters for HEVC Encoder
Taejin, Hwang ; Ahn, Yongjo ; Ryu, Jiwoo ; Sim, Donggyu ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 199~203
DOI : 10.5573/ieek.2013.50.10.199
In this paper, a fast algorithm of discrete cosine transform-based interpolation filter (DCT-IF) for HEVC (high efficiency video coding) encoder is proposed. DCT-IF filter accounts for around 30% of encoder complexity, according to the computational complexity analysis with the HEVC reference software. In this work, the proposed DCT-IF is optimized by applying frame-level interpolation, SIMD optimization, and task-level parallelization via OpenMP on a developed C-based HEVC encoder. Performance analysis is conducted by measuring speed-up factor of the proposed optimization technique on the developed encoder. The results show that speed-up factors by frame-level interpolation, SIMD, and OpenMP are approximately 38-46, 3.6-4.4, and 3.0-3.7, respectively. In the end, we achieved the speed-up factor of 498.4 with the proposed fast algorithm.
The Design of Feature Selecting Algorithm for Sleep Stage Analysis
Lee, JeeEun ; Yoo, Sun K. ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 207~216
DOI : 10.5573/ieek.2013.50.10.207
The aim of this study is to design a classifier for sleep stage analysis and select important feature set which shows sleep stage well based on physiological signals during sleep. Sleep has a significant effect on the quality of human life. When people undergo lack of sleep or sleep-related disease, they are likely to reduced concentration and cognitive impairment affects, etc. Therefore, there are a lot of research to analyze sleep stage. In this study, after acquisition physiological signals during sleep, we do pre-processing such as filtering for extracting features. The features are used input for the new combination algorithm using genetic algorithm(GA) and neural networks(NN). The algorithm selects features which have high weights to classify sleep stage. As the result of this study, accuracy of the algorithm is up to 90.26% with electroencephalography(EEG) signal and electrocardiography(ECG) signal, and selecting features are alpha and delta frequency band power of EEG signal and standard deviation of all normal RR intervals(SDNN) of ECG signal. We checked the selected features are well shown that they have important information to classify sleep stage as doing repeating the algorithm. This research could use for not only diagnose disease related to sleep but also make a guideline of sleep stage analysis.
Spatio-Spectral Coherence Analysis of ERP signals for Attentional Visual Stimulus
Lee, ByuckJin ; Yoo, SunKook ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 217~228
DOI : 10.5573/ieek.2013.50.10.217
In this paper, the brain function in relation with human's visual attention was investigated by means of coherence and bicoherence methods. Throughout experimentation with attentional visual stimulus ERP (Event Related Potential) data and synthesized simulated data with different combinations of parameters, it is demonstrated that bicoherence and coherence can be useful to reveal the phase synchronies between different frequency bands at fixed scalp location, and between different scalp locations at fixed frequency band, respectively. Both methods are also affected by time interval from the onset, and the level of white noise added. The phase coupled relationships among
bands, and between frontal and central lobes were observed for attentional tasks, while those were little observable for inattentional tasks, which can show brain's functional spatio-spectral differences associated with human's attention.
A Integrated Circuit Design of DC-DC Converter for Flat Panel Display
Lee, Jun-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 231~238
DOI : 10.5573/ieek.2013.50.10.231
This paper describes a DC-DC converter IC for Flat Panel Displays. In case of operate LCD devices various type of DC supply voltage is needed. This device can convert DC voltage from 6~14[V] single supply to -5[V], 15[V], 23[V], and 3.3[V] DC supplies. In order to meet current and voltage specification considered different type of DC-DC converter circuits. In this work a negative charge pump DC-DC converter(-5V), a positive charge pump DC-DC converter(15V), a switching Type Boost DC-DC converter(23V) and a buck DC-DC converter(3.3V). And a oscillator, a thermal shut down circuit, level shift circuits, a bandgap reference circuits are designed. This device has been designed in a 0.35[
] triple-well, double poly, double metal 30[V] CMOS process. The designed circuit is simulated and this one chip product could be applicable for flat panel displays.
Design of a Low Drop-out Regulator with a UVLO Protection Function
Park, Won Kyeong ; Lee, Su Jin ; Park, Yong Su ; Song, Han Jung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 239~244
DOI : 10.5573/ieek.2013.50.10.239
This paper presents a design of the CMOS LDO regulator with a UVLO protection function for a high speed PMIC. Proposed LDO regulator circuit consists of a BGR reference circuit, an error amplifier and a power transistor and so on. UVLO block between the power transistor and the power supply is added for a low input protection function. Also, UVLO block showed normal operation with turn-off voltage of 2.7V and turn-on voltage of 4 V in condition of 5 V power supply. Proposed circuit generated fixed 3.3 V from a supply of 5V. From SPICE simulation results using a
high voltage CMOS technology, simulation results were 5.88 mV/V line regulation and 27.5 uV/mA load regulation with load current 0 mA to 200 mA.
Numerical Calculation for Impedance of Horizontal Ground Electrode for Information and Communication Facilities with Considering Characteristics of Permittivity in Soil
Ahn, Chang-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 10, 2013, Pages 245~251
DOI : 10.5573/ieek.2013.50.10.245
An impedance of ground electrode for information and communication facilities has a significant relationship with the electrical characteristics of soil where the ground electrode is buried. Especially, the impedance of ground electrode is directly affected by the characteristics of permittivity and conductivity in soil as a function of a frequency of an applied electric field. The program based on the electromagnetic field model was developed in MATLAB. Because both permittivity and conductivity can not be modified in commercial programs. The permittivity of soil was applied with the Debye equation which is a model of dielectric relaxation. And the empirical equation of the conductivity in soil was quoted in other paper. In order to confirm the reliability of proposed program, the impedance measurement of ground electrode was carried out, which were compared with the results of simulation in commercial program. In result, it was confirmed that the impedance and phase different simulated by appling the characteristics of permittivity and conductivity in soil are in good agreement with the measured values than results of NEC.