Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of IKEEE
Journal Basic Information
Journal DOI :
Institude of Korean Electrical and Electronics Engineers
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2014
Volume 18, Issue 3 - Sep 2014
Volume 18, Issue 2 - Jun 2014
Volume 18, Issue 1 - Mar 2014
Selecting the target year
Application and Evaluation of Emergency Rates in Overhead Transmission Lines
Kim, Sung Duck ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 442~446
DOI : 10.7471/ikeee.2014.18.4.442
A method for applying emergency ratings to improve the reliability of power supply in ACSR overhead transmission lines is described in this paper. Due to re-regulate power industry, most power companies worldwide as well KEPCO have been searching for only economical strategies without new investment. Power demand was rapidly increasing, however, generation amount did not follow sufficiently. Hence in order to increase the transmission capacity for the existing transmission lines in case of peak load, or contingency in transmission lines, an application method of emergency ratings such as short or long term rating is proposed. If applying long term emergency rating instead of static line rating for the period of a peak load, power transmission can be increased to 10 % or more. Furthermore, it was shown that emergency rating can be effectively used in the contingency of double-circuit transmission lines and/or overload cases.
SiC/SiO2 Interface Characteristics in N-based 4H-SiC MOS Capacitor Fabricated with PECVD and NO Annealing Processes
Song, Gwan-Hoon ; Kim, Kwang-Soo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 447~455
DOI : 10.7471/ikeee.2014.18.4.447
In this research, n-based 4H-MOS Capacitor was fabricated with PECVD (plasma enhanced chemical vapor deposition) process for improving SiC/
interface properties known as main problem of 4H-SiC MOSFET. To overcome the problems of dry oxidation process such as lower growth rate, high interface trap density and low critical electric field of
, PECVD and NO annealing processes are used to MOS Capacitor fabrication. After fabrication, MOS Capacitor's interface properties were measured and evaluated by hi-lo C-V measure, I-V measure and SIMS. As a result of comparing the interface properties with the dry oxidation case, improved interface and oxide properties such as 20% reduced flatband voltage shift, 25% reduced effective oxide charge density, increased oxide breakdown field of 8MV/cm and best effective barrier height of 1.57eV, 69.05% reduced interface trap density in the range of 0.375~0.495eV under the conduction band are observed.
Study on Scintillator Polishing Technology for Increasing the Detection Efficiency of Radiation Detectors Using Plastic Scintillators
Kim, Jeong-Ho ; Joo, Koan-Sik ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 456~462
DOI : 10.7471/ikeee.2014.18.4.456
Scintillators were polished in four steps using polishing paper, to reduce the optical loss occurring at their cross section when radiation detectors are fabricated with plastic scintillators. We studied the correlation between the polishing steps and detection efficiency and assessed the detection characteristics that are dependent in the polishing steps. Our results showed that the detection efficiency increased by approximately 7.75 times for a detector that used a scintillator polished in four steps, compared to a detector that used an depolished scintillator. For detectors fabricated using scintillators polished in different steps, better detection characteristics were obtained in terms of the activity, distance, and location of radiation, compared to detectors fabricated with an depolished scintillator.
Interfacial Boundary Estimation in Stratified Flow of Two Immiscible Liquids Using Hybrid-type Fourier Series
Kim, Bong Seok ; Choi, Bong-Yeol ; Kim, Kyung Youn ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 463~470
DOI : 10.7471/ikeee.2014.18.4.463
In stratified flows of two immiscible liquids, due to the vibration in a pipe, the shape of the interface is not always periodic and it causes the different end points of the interfacial boundary. In this case the performance is not good. To solve this, in this paper, the hybrid-type Fourier series is proposed, which consists of both the polynomial and the trigonometric terms. Under the stationary interfacial boundary during acquiring a full set of voltage data, the performance of the proposed method is evaluated through the numerical experiments. The results show that the proposed method performs better than the conventional Fourier series in estimating the interfacial boundary.
A Study On Low-cost LPR(License Plate Recognition) System Based On Smart Cam System using Android
Lee, Hee-Yeol ; Lee, Seung-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 471~477
DOI : 10.7471/ikeee.2014.18.4.471
In this paper, we propose a low-cost license plate recognition system based on smart cam system using Android. The proposed system consists of a portable device and server. Potable device Hardware consists of ARM Cortex-A9 (S5PV210) processor control unit, a power supply device, wired and wireless communication, input/output unit. We develope Linux kernel and dedicated device driver for WiFi module and camera. The license plate recognition algorithm is consisted of setting candidate plates areas with canny edge detector, extracting license plate number with Labeling, recognizing with template matching, etc. The number that is recognized by the device is transmitted to the remote server via the user mobile phone, and the server re-transfer the vehicle information in the database to the portable device. To verify the utility of the proposed system, user photographs the license plate of any vehicle in the natural environment. Confirming the recognition result, the recognition rate was 95%. The proposed system was suitable for low cost portable license plate recognition device, it enabled the stability of the system when used long time by using the Android operating system.
A Study On Positioning Of Mouse Cursor Using Kinect Depth Camera
Goo, Bong-Hoe ; Lee, Seung-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 478~484
DOI : 10.7471/ikeee.2014.18.4.478
In this paper, we propose new algorithm for positioning of mouse cursor using fingertip direction on kinect depth camera. The proposed algorithm uses center of parm points from distance transform when fingertip point toward screen. Otherwise, algorithm use fingertip points. After image preprocessing, the center of parm points is calculated from distance transform results. If the direction of the finger towards the camera becomes close to the distance between the fingertip point and center of parm point, it is possible to improve the accuracy of positioning by using the center of parm point. After remove arm on image, the fingertip points is obtained by using a pixel on the long distance from the center of the image. To calculate accuracy of mouse positioning, we selected any 5 points. Also, we calculated error rate between reference points and mouse points by performed 500 times. The error rate results could be confirmed the accuracy of our algorithm indicated an average error rate of less than 11%.
Traffic Sign Recognition using SVM and Decision Tree for Poor Driving Environment
Jo, Young-Bae ; Na, Won-Seob ; Eom, Sung-Je ; Jeong, Yong-Jin ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 485~494
DOI : 10.7471/ikeee.2014.18.4.485
Traffic Sign Recognition(TSR) is an important element in an Advanced Driver Assistance System(ADAS). However, many studies related to TSR approaches only in normal daytime environment because a sign's unique color doesn't appear in poor environment such as night time, snow, rain or fog. In this paper, we propose a new TSR algorithm based on machine learning for daytime as well as poor environment. In poor environment, traditional methods which use RGB color region doesn't show good performance. So we extracted sign characteristics using HoG extraction, and detected signs using a Support Vector Machine(SVM). The detected sign is recognized by a decision tree based on 25 reference points in a Normalized RGB system. The detection rate of the proposed system is 96.4% and the recognition rate is 94% when applied in poor environment. The testing was performed on an Intel i5 processor at 3.4 GHz using Full HD resolution images. As a result, the proposed algorithm shows that machine learning based detection and recognition methods can efficiently be used for TSR algorithm even in poor driving environment.
Diversity modem for IEEE802.11p WAVE
Yoon, Sanghun ; Jin, Seongkeun ; Shin, Daegyo ; Lim, Kitaeg ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 495~501
DOI : 10.7471/ikeee.2014.18.4.495
In this paper, we designed a diversity modem hardware architecture for IEEE802.11p WAVE and tested the modem on the road with car attached shark antenna. One of the dual channel modem and the diversity single modem with maximum ratio combining algorithm can be selected on the designed architecture. The designed modem have been implemented on the Xillinx Kintex7 FPGA. We tested the modem performance on the smart highway experience road. As experimental results, we can verify the performance of the diversity modem on real road and the enlarged communication range by more than 30%.
Performances of Various AGC Algorithms for IEEE802.11p WAVE
Jin, Seong-Keun ; Yoon, Sang-Hun ; Shin, Dae-Kyo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 502~508
DOI : 10.7471/ikeee.2014.18.4.502
This paper has reviewed the performances of various AGCs which can be adopted in IEEE802.11p modems. IEEE802.11p, a high speed mobile communication standard for vehicles, requires high performance signal detector since the channel impulse responses are varied rapidly in time. In order to select the optimal signal detector, we simulated the performances of three detection methods. One is using RSSI signal, the other is using RSSI signal and I/Q signal, and the third is using I/Q signal through the Monte Carlo simulation. We evaluated the performances of the algorithms using our own system based on MAX 2829 transceiver(MAXIM
) in a real vehicular environment. As a result, the experiment using Fully I/Q signal derives the most excellent performance with the lowest minimum receiver sensitivity, packet error rate (PER) and false alarm rate (FAR).
Real-time Matrix type CRC in High-Speed SDRAM
Lee, Joong-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 509~516
DOI : 10.7471/ikeee.2014.18.4.509
CRC feature in a high-speed semiconductor memory devices such as DDR4/GDDR5 increases the data reliability. Conventional CRC method have a massive area overhead and long delay time. It leads to insufficient internal timing margins for CRC calculation. This paper, presents a CRC code method that provides error detection and a real-time matrix type CRC. If there are errors in the data, proposed method can alert to the system in a real-time manner. Compare to the conventional method(XOR 6 stage ATM-8 HEC code), the proposing method can improve the error detection circuits up to 60% and XOR stage delay by 33%. Also the real-time error detection scheme can improve the error detection speed to agerage 50% for the entire data bits(UI0~UI9).
Consensus of Linear Multi-Agent Systems with an Arbitrary Network Delay
Lee, Sungryul ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 517~522
DOI : 10.7471/ikeee.2014.18.4.517
This paper investigates the consensus problem for linear multi-agent systems with an arbitrary network delay. The sufficient conditions for a state consensus of linear multi-agent systems are provided by using linear matrix inequalities. Moreover, it is shown that under the proposed protocol, the consensus can be achieved even in the presence of an arbitrarily large network delay. Finally, an illustrative example is given in order to show the effectiveness of our design method.
Fast Blind Image Denoising Algorithm Based on Estimating Noise Parameters
Nguyen, Tuan-Anh ; Kim, Beomsu ; Hong, Min-Cheol ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 523~531
DOI : 10.7471/ikeee.2014.18.4.523
In this paper, a fast single image blind denoising algorithm is presented, where noise parameters are estimated by local statistics of an observed degraded image without a prior information about the additive noise. The estimated noise parameters are used to define the constraints on the noise detection which is coupled with the 1st-order Markov Random Field. In addition, an adaptive modified weighted Gaussian filter is introduced, where variable window sizes and weighting coefficients defined by the constraints are used to control the degree of the smoothness of the reconstructed image. The experimental results demonstrate the capability of the proposed algorithm. Please put the abstract of paper here.
Thermal Characteristics according to Trench Etch angle of Super Junction MOSFET
Kang, Ey Goo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 532~535
DOI : 10.7471/ikeee.2014.18.4.532
This paper analyzed thermal characteristics of super junction MOSFET using process and design parameters. Trench process is very important to super junction MOSFET process. We analyzed the difference of temperature, thermal resistance, total power consumption according to trench etch angle. As a result we obtained minimum value of temperature difference and thermal resistance at
of trench etch angle. The electrical characteristics distribution of super junction MOSFET is not showed tendency according to trench etch angle. We need iterative experiments and simulation for optimal value of electrical characteristics. The super junction power MOSFET that has superior thermal characteristics will use automobile and industry.
Application of Multi-Class AdaBoost Algorithm to Terrain Classification of Satellite Images
Nguyen, Ngoc-Hoa ; Woo, Dong-Min ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 536~543
DOI : 10.7471/ikeee.2014.18.4.536
Terrain classification is still a challenging issue in image processing, especially with high resolution satellite images. The well-known obstacles include low accuracy in the detection of targets, especially for the case of man-made structures, such as buildings and roads. In this paper, we present an efficient approach to classify and detect building footprints, foliage, grass and road from high resolution grayscale satellite images. Our contribution is to build a strong classifier using AdaBoost based on a combination of co-occurrence and Haar-like features. We expect that the inclusion of Harr-like feature improves the classification performance of the man-made structures, since Haar-like feature is extracted from corner features and rectangle features. Also, the AdaBoost algorithm selects only critical features and generates an extremely efficient classifier. Experimental result indicates that the classification accuracy of AdaBoost classifier is much higher than that of the conventional classifier using back propagation algorithm. Also, the inclusion of Harr-like feature significantly improves the classification accuracy. The accuracy of the proposed method is 98.4% for the target detection and 92.8% for the classification on high resolution satellite images.
A Study On Low Radiation Measurement of Radiation Measuring Devices and Improvement of Reaction Speed according to the Rapid Change of Radiation Dose
Lee, Joo-Hyun ; Lee, Seung-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 544~551
DOI : 10.7471/ikeee.2014.18.4.544
This paper suggests an algorithm to measure low-level radiation by radiation measuring devices, and the other algorithm to improve reaction speed of the device to better respond to dramatic changes in radiation amount. The former algorithm to improve the accuracy of measuring low-level radiation takes advantage of a dual window radiation measurement method which is based on accumulated average of pulses gathered by a radiation measuring sensor. The latter algorithm is to enhance reaction speed of a measuring device to more sensitively react to dramatic changes in radiation amount by adopting a dual window radiation measurement method which analyzes data patterns newly put into for six seconds. To verify the suggested algorithms, a hardware-which consists of sensor and high-voltage generator, controller, charger and power supply circuit, wireless communication part, and display part-was used. Tests conducted on the dual window radiation measurement method as used in the suggested algorithm have proved that accuracy improves to measure low-level radiation of 5uSv/h, and linearity also gets better. Other tests were conducted to see whether the suggested algorithm enhances the reaction speed of a radiation measuring device so that the device responds better to dramatically changing radiation amount. The experimental results have shown meaningful changes in numbers after six seconds. Therefore, the conclusions are made that the algorithm enhances the reaction speed of the device.
A Study On Design of ZigBee Chip Communication Module for Remote Radiation Measurement
Lee, Joo-Hyun ; Lee, Seung-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 552~558
DOI : 10.7471/ikeee.2014.18.4.552
This paper suggests how to design a ZigBee-chip-based communication module to remotely measure radiation level. The suggested communication module consists of two control processors for the chip as generally required to configure a ZigBee system, and one chip module to configure a ZigBee RF device. The ZigBee-chip-based communication module for remote radiation measurement consists of a wireless communication controller; sensor and high-voltage generator; charger and power supply circuit; wired communication part; and RF circuit and antenna. The wireless communication controller is to control wireless communication for ZigBee and to measure radiation level remotely. The sensor and high-voltage generator generates 500 V in two consecutive series to amplify and filter pulses of radiation detected by G-M Tube. The charger and power supply circuit part is to charge lithium-ion battery and supply power to one-chip processors. The wired communication part serves as a RS-485/422 interface to enable USB interface and wired remote communication for interfacing with PC and debugging. RF circuit and antenna applies an RLC passive component for chip antenna to configure BALUN and antenna impedance matching circuit, allowing wireless communication. After configuring the ZigBee-chip-based communication module, tests were conducted to measure radiation level remotely: data were successfully transmitted in 10-meter and 100-meter distances, measuring radiation level in a remote condition. The communication module allows an environment where radiation level can be remotely measured in an economically beneficial way as it not only consumes less electricity but also costs less. By securing linearity of a radiation measuring device and by minimizing the device itself, it is possible to set up an environment where radiation can be measured in a reliable manner, and radiation level is monitored real-time.
A 3 dB Coupler for Double Sided Printed Circuit Boards
Lee, Dong-Ho ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 559~565
DOI : 10.7471/ikeee.2014.18.4.559
A 3 dB coupler has been designed and implemented using the most commonly used double-sided FR4 boards. The coupling and the bandwidth of the coupler are enhanced with the enlarged overlapped area of the coupler. Major design parameters are plotted as a design guide and the parameters are verified by simulation and measurement. The size of the manufactured coupler is
. Its measured insertion loss and phase difference are 0.6 dB and
at center frequency of 2.5 GHz, respectively. The operating frequency range is 1.72 GHz to 3.08 GHz for
insertion loss. The coupler has the performance similar to that of conventional Lange coupler, and implementation of the coupler is easy and cheap with wide metal width and spacing and no additional wire bonding process.
Testbench Implementation for FPGA based Nuclear Safety Class System using OVM
Heo, Hyung-Suk ; Oh, Seungrohk ; Kim, Kyuchull ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 566~571
DOI : 10.7471/ikeee.2014.18.4.566
A safety class field programmable gate array based system in nuclear power plant has been developed to improve the diversity. Testbench is necessary to satisfy the technical reference, IEC-62566, for verification and validation of register transfer level code. We use the open verification methodology(OVM) developed by standard body. We show that our testbench can use random input for test. And also we show that reusability of block level testbench for the integration level testbench, which is very efficient for large scale system like nuclear reactor protection system.
Modular Robot for Promoting Creativity Development in Play and Education
Choi, Joon-Sik ; Lee, Bo-Hee ; Kim, Jin-Geol ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 572~580
DOI : 10.7471/ikeee.2014.18.4.572
This study deals with reconfigurable modular robot with respect to the compact and capability of representing the various actions for promoting creativity through education and play. Generally modular robot can be designed as a suitable robot that is transformed to various structure by reconstructing each cells, However, there are only few research on the education and play using those robots in the world and still nothing domestically. Unlike the existing modular robots only having a repeating motion, the proposed modular works by individual module such as sound is produced by sound module, wheel is driven by wheel module, LED module controls the visual expression, power is supplied by battery module, bluetooth module for communication, and dynamic motion realization is possible by using joint module. By manipulating the abilities endowed by individual modules, diversity of creative activities is possible and thus made an easy access for children. This study deals with the design of modular robotic by using the variety of different modules to endowed the learning and playing ability. And the study showed the utility of the operating behavior over the actual production and testing.
Implementation of Pedestrian Recognition Based on HOG using ROI for Real Time Processing
Lee, Joo-Young ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 581~585
DOI : 10.7471/ikeee.2014.18.4.581
In this paper, we propose a pedestrian detection by applying the HOG feature using ROI. Conventional HOG method has high accuracy, but shows the disadvantage of slow processing speed. By applying the ROI to the conventional method reduce computations for unnecessary area. Therefore proposed method improves the processing speed. In order to set the ROI area, we propose a structure that combined odd frames and even frames. Odd frame is in charge of operation for the entire area. And even frame does the operation for the ROI area. Implementation results of proposed method maintaining the same accuracy as the conventional method show a 20% improved performance of 8.3 frames per second.
Low-area Dual mode DC-DC Buck Converter with IC Protection Circuit
Lee, Joo-Young ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 586~592
DOI : 10.7471/ikeee.2014.18.4.586
In this paper, high efficiency power management IC(PMIC) with DT-CMOS(Dynamic threshold voltage Complementary MOSFET) switching device is presented. PMIC is controlled PWM control method in order to have high power efficiency at high current level. The DT-CMOS switch with low on-resistance is designed to decrease conduction loss. The control parts in Buck converter, that is, PWM control circuit consist of a saw-tooth generator, a band-gap reference(BGR) circuit, an error amplifier, comparator circuit, compensation circuit, and control block. The saw-tooth generator is made to have 1.2MHz oscillation frequency and full range of output swing from supply voltage(3.3V) to ground. The comparator is designed with two stage OP amplifier. And the error amplifier has 70dB DC gain and
phase margin. DC-DC converter, based on current mode PWM control circuits and low on-resistance switching device, achieved the high efficiency nearly 96% at 100mA output current. And Buck converter is designed along LDO in standby mode which fewer than 1mA for high efficiency. Also, this paper proposes two protection circuit in order to ensure the reliability.
The Implementable Functions of the CoreNet of a Multi-Valued Single Neuron Network
Park, Jong Joon ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 593~602
DOI : 10.7471/ikeee.2014.18.4.593
One of the purposes of an artificial neural netowrk(ANNet) is to implement the largest number of functions as possible with the smallest number of nodes and layers. This paper presents a CoreNet which has a multi-leveled input value and a multi-leveled output value with a 2-layered ANNet, which is the basic structure of an ANNet. I have suggested an equation for calculating the capacity of the CoreNet, which has a p-leveled input and a q-leveled output, as
. I've applied this CoreNet into the simulation model 1(5)-1(6), which has 5 levels of an input and 6 levels of an output with no hidden layers. The simulation result of this model gives, the maximum 219 convergences for the number of implementable functions using the cot(
) input leveling method. I have also shown that, the 27 functions are implementable by the calculation of weight values(w,
) with the multi-threshold lines in the weight space, which are diverged in the simulation results. Therefore the 246 functions are implementable in the 1(5)-1(6) model, and this coincides with the value from the above eqution
. I also show the implementable function numbering method in the weight space.
Standardized Description Method of Optical Characteristics Tests for Image Sensor Modules
Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 603~611
DOI : 10.7471/ikeee.2014.18.4.603
When image sensor and lens are fixed on the module, mechanical errors often induce tilt, rotation, or narrow field-of-view of the acquired image. Therefore, the optical characteristics of image sensor modules should be tested by test equipments. This paper explains how to test the optical characteristics of images sensors. It also proposes the standardized description methods of optical characteristics tests which are similar with those of image acquisition characteristics tests. The proposed method helps the test equipments to perform image acquisition characteristics tests and optical characteristics tests together.
Implementation of Real-Time Multi-Camera Video Surveillance System with Automatic Resolution Control Using Motion Detection
Jung, Seulkee ; Lee, Jong-Bae ; Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 612~619
DOI : 10.7471/ikeee.2014.18.4.612
This paper proposes a real-time multi-camera video surveillance system with automatic resolution control using motion detection. In ordinary times, it acquires 4 channels of QVGA images, and it merges them into single VGA image and transmit it. When motion is detected, it automatically increases the resolution of motion-occurring channel to VGA and decreases those of 3 other channels to QQVGA, and then these images are overlaid and transmitted. Thus, it can magnifies and watches the motion-occurring channel while maintaining transmission bandwidth and monitoring all other channels. When it is synthesized with 0.18 um technology, the maximum operating frequency is 110 MHz, which can theoretically support 4 HD cameras.
Electrical characteristics of 4H-SiC MIS Capacitors With Ni/CNT/SiO2 Structure
Lee, Taeseop ; Koo, Sang-Mo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 620~624
DOI : 10.7471/ikeee.2014.18.4.620
In this study, the electrical characteristics of Ni/CNT/
structures were investigated in order to analyze the mechanism of carbon nanotubes in 4H-SiC MIS device structures. We fabricated 4H-SiC MIS capacitors with or without carbon nanotubes. Carbon nanotubes were dispersed by isopropyl alcohol. The capacitance-voltage (C-V) is characterized at 300 to 500K. The experimental flat-band voltage (
) shift was positive. Near-interface trapped charge density and oxide trapped charge density values of Ni/CNT/
structure were less than values of reference samples. With increasing temperature, the flat-band voltage was negative. It has been found that its oxide quality is related to charge carriers or defect states in the interface of 4H-SiC MIS capacitors. Gate characteristics of 4H-SiC MIS capacitors can be controlled by carbon nanotubes between Ni and
Sub-1V Series-Tuned Differential Colpitts VCO with Quarter Wavelength Microstrip Line Current Sources
Jeon, Man-Young ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 625~629
DOI : 10.7471/ikeee.2014.18.4.625
This study derives the asymptotic phase noise formula of the oscillators perturbed by the colored noises. Based on the derived formula, this study presents a sub-1V series-tuned differential Colpitts VCO. The ADS simulation result on the phase noise shows that the presented VCO exhibits about 3dBc/Hz lower phase noise at the 1MHz offset frequency from the oscillation frequency of 4.8GHz than the existing series-tuned differential Colpitts VCO with the inductor current sources.
Hardware Implementation of HEVC CABAC Binary Arithmetic Encoder
Pham, Duyen Hai ; Moon, Jeonhak ; Kim, Doohwan ; Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 630~635
DOI : 10.7471/ikeee.2014.18.4.630
In this paper, hardware architecture of BAE (binary arithmetic encoder) was proposed for HEVC (high efficiency video coding) CABAC (context-based adaptive binary arithmetic coding) encoder. It can encode each bin in a single cycle. It consists of controller, regular encoding engine, bypass encoding engine, and termination engine. The proposed BAE was designed in Verilog HDL, and it was implemented in 180 nm technology. Its operating speed, gate count, and power consumption are 180 MHz, 3,690 gates, and 2.88 mW, respectively.
IoT Based Intelligent Position and Posture Control of Home Wellness Robots
Lee, Byoungsu ; Hyun, Chang-Ho ; Kim, Seungwoo ;
Journal of IKEEE, volume 18, issue 4, 2014, Pages 636~644
DOI : 10.7471/ikeee.2014.18.4.636
This paper is to technically implement the sensing platform for Home-Wellness Robot. First, self-localization technique is based on a smart home and object in a home environment, and IOT(Internet of Thing) between Home Wellness Robots. RF tag is set in a smart home and the absolute coordinate information is acquired by a object included RF reader. Then bluetooth communication between object and home wellness robot provides the absolute coordinate information to home wellness robot. After that, the relative coordinate of home wellness robot is found and self-localization through a stereo camera in a home wellness robot. Second, this paper proposed fuzzy control methode based on a vision sensor for approach object of home wellness robot. Based on a stereo camera equipped with face of home wellness robot, depth information to the object is extracted. Then figure out the angle difference between the object and home wellness robot by calculating a warped angle based on the center of the image. The obtained information is written Look-Up table and makes the attitude control for approaching object. Through the experimental with home wellness robot and the smart home environment, confirm performance about the proposed self-localization and posture control method respectively.