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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
Journal Basic Information
Journal DOI :
Institude of Korean Electrical and Electronics Engineers
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Volume & Issues
Volume 19, Issue 4 - Dec 2015
Volume 19, Issue 3 - Sep 2015
Volume 19, Issue 2 - Jun 2015
Volume 19, Issue 1 - Mar 2015
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An Implementation of the Real-time Image Stitching Algorithm Based on ROI
Kwak, Jae Chang ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 460~464
DOI : 10.7471/ikeee.2015.19.4.460
This paper proposes a panoramic image stitching that operates in real time at the embedded environment by applying ROI and PROSAC algorithm. The conventional panoramic image stitching applies SURF or SIFT algorithm which contains complicated operations and a lots of data, at the overall image to detect feature points. Also it applies RANSAC algorithm to remove outliers, so that an additional verification time is required due to its randomness. In this paper, unnecessary data are eliminated by setting ROI based on the characteristics of panorama images, and PROSAC algorithm is applied for removing outliers to reduce verification time. The proposed method was implemented on the ORDROID-XU board with ARM Cortex-A15. The result shows an improvement of about 54% in the processing time compared to the conventional method.
Hartley-VCO Using Linear OTA-based Active Inductor
Jeong, Seong-Ryeol ; Chung, Won-Sup ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 465~471
DOI : 10.7471/ikeee.2015.19.4.465
An LC-tuned sinusoidal voltage-controlled oscillator (VCO) using temperature-stable linear operational transconductance amplifiers (OTAs) is presented. Its architecture is based on Hartley oscillator configuration, where the inductor is active one realized with two OTAs and a grounded capacitor. Two diode limiters are used for limiting amplitude. A prototype oscillator built with discrete components exhibits less than 3.1% nonlinearity in its current-to-frequency transfer characteristic from 1.99 MHz to 39.14 MHz and
frequency stability to the temperature drift over 0 to
. The total harmonic distortion (THD) is as low as 4.4 % for a specified frequency-tuning range. The simulated phase noise of the VCO is about -108.9 dBc/Hz at 1 MHz offset frequency in frequency range of 0.4 - 46.97 MHz and property of phase noise of VCO is better than colpitts-VCO.
Implementation of Smart Safe Return Service Supporting Multiple Users
Lee, Keonbae ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 472~478
DOI : 10.7471/ikeee.2015.19.4.472
When user wants to receive a smart safe return service, user sends a service request using a smart device to support GPS location data. After the smart safe return system receives the location of user, it selects the neighboring CCTV cameras based on user's location information, and controls the selected CCTV cameras to take a picture of the user, and to chase the user automatically. This service can be useful when there is a crime-ridden district on the path to return home late at night. Previous systems can't provide the smart safe return service to multiple user simultaneously. In this paper, we propose the smart safe return system which can provide the service to multiple users simultaneously.
A Resistance Deviation-To-Time Interval Converter Based On Dual-Slope Integration
Shang, Zhi-Heng ; Chung, Won-Sup ; Son, Sang-Hee ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 479~485
DOI : 10.7471/ikeee.2015.19.4.479
A resistance deviation-to-time interval converter based on dual-slope integration using second generation current conveyors (CCIIs) is designed for connecting resistive bridge sensors with a digital system. It consists of a differential integrator using CCIIs, a voltage comparator, and a digital control logic for controlling four analog switches. Experimental results exhibit that a conversion sensitivity amounts to
over the resistance deviation range of
and its linearity error is less than
. Its temperature stability is less than
in the temperature range of
. Power dissipation of the converter is 60.2 mW.
Analysis of Low Frequency Noise Variation in Temperature Sensor With Bi
Cho, Il Hwan ; Seo, Dongsun ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 486~490
DOI : 10.7471/ikeee.2015.19.4.486
Sensitivity characteristics of temperature sensor with
(BMNO) layer were investigated with low frequency noise measurement. Temperature sensor with BMNO layer had high reliability and high sensitivity comparing with conventional MOS type temperature sensor. Annealing temperature variation effects with
were measured and analyzed. Annealing temperature determines trap distribution and
annealing sample has different pattern comparing with other samples. Results of low frequency noise can offer the design guide of temperature sensor performance.
The Analysis of the Breakdown Voltage according to the Change of JTE Structures and Design Parameters of 4H-SiC Devices
Koo, Yoon-Mo ; Cho, Doo-Hyung ; Kim, Kwang-Soo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 491~499
DOI : 10.7471/ikeee.2015.19.4.491
Silicon Carbide(SiC) has large advantage in high temperature and high voltage applications because of its high thermal conductivity and large band gap energy. When using SiC to design power semiconductor devices, edge termination techniques have to be adjusted for its maximum breakdown voltage characteristics. Many edge termination techniques have been proposed, and the most appropriate technique for SiC device is Junction Termination Extension(JTE). In this paper, the change of breakdown voltage efficiency ratio according to the change of doping concentration and passivation oxide charge of each JTE techniques is demonstrated. As a result, the maximum breakdown voltage ratio of Single Zone JTE(SZ-JTE), Double Zone JTE(DZ-JTE), Multiple Floating Zone JTE(MFZ-JTE), and Space Modulated JTE(SM-JTE) is 98.24%, 99.02%, 98.98%, 99.22% each. MFZ-JTE has the smallest and SZ-JTE has the largest sensitivity of breakdown voltage ratios according to the change of JTE doping concentration. Additionally the degradation of breakdown voltage due to the passivation oxide charge is analyzed, and the sensitivity is largest in SZ-JTE and smallest in MFZ-JTE, too. In this paper, DZ-JTE and SM-JTE is the best efficiency JTE techniques than MFZ-JTE which needs large doping concentration in short JTE width.
Accuracy Comparison of Existing 3 Models in Estimating Time-Varying Variance of Phase Deviation of a Simple Planar Oscillator
Jeon, Man-Young ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 500~505
DOI : 10.7471/ikeee.2015.19.4.500
Through Montecarlo simulation, this study compares how accurately the existing three phase deviation models estimate the time-varying variance of a planar oscillator perturbed by Gaussian noises. The comparison reveals that Kaertner model estimates the time-varying variance with about 1000 times higher accuracy than ISF or PP model exhibits. Additionally, it finds that the estimation accuracy of PP model is somewhat higher than that of ISF model.
A Capacitorless Low-Dropout Regulator With Enhanced Response Time
Yeo, Jae-Jin ; Roh, Jeong-Jin ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 506~513
DOI : 10.7471/ikeee.2015.19.4.506
In this paper, an output-capacitorless, low-dropout (LDO) regulator is designed, which consumes
quiescent current. Proposed LDO regulator is realized using two amplifier for good load regulation and fast response time, which provide high gain, high bandwidth, and high slew rate. In addition, a one-shot current boosting circuit is added for current control to charge and discharge the parasitic capacitance at the pass transistor gate. As a result, response time is improved during load-current transition. The designed circuit is implemented through a
CMOS process. We experimentally verify output voltage fluctuation of 260mV and recovery time of
at maximum load current 200mA.
Development of Gate Structure in Junctionless Double Gate Field Effect Transistors
Cho, Il Hwan ; Seo, Dongsun ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 514~519
DOI : 10.7471/ikeee.2015.19.4.514
We propose the multiple gate structure of double gate junctionless metal oxide silicon field oxide transistor (JL MOSFET) for device optimization. Since different workfunction within multiple metal gates, electric potential nearby source and drain region is modulated in accordance with metal gate length. On current, off current and threshold voltage are influenced with gate structure and make possible to meet some device specification. Through the device simulation work, performance optimization of double gate JL MOSFETs are introduced and investigated.
Consensus of High-Order Integrators With a Communication Delay
Lee, Sungryul ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 520~525
DOI : 10.7471/ikeee.2015.19.4.520
This paper investigates the consensus problem for high-order integrators with an arbitrary large communication delay. In order to solve this problem, new consensus controller with an additional design parameter that can eliminate the effect of a communication delay on the consensus problem is proposed. Also, it is proved that the proposed consensus controller can always solve the consensus problem of high-order integrators even in the presence of an arbitrarily large communication delay. Finally, an illustrative example is given in order to show the effectiveness of our design method.
Offline Handwritten Numeral Recognition Using Multiple Features and SVM classifier
Kim, Gab-Soon ; Park, Joong-Jo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 526~534
DOI : 10.7471/ikeee.2015.19.4.526
In this paper, we studied the use of the foreground and background features and SVM classifier to improve the accuracy of offline handwritten numeral recognition. The foreground features are two directional features: directional gradient feature by Kirsch operators and directional stroke feature by local shrinking and expanding operations, and the background feature is concavity feature which is extracted from the convex hull of the numeral, where the concavity feature functions as complement to the directional features. During classification of the numeral, these three features are combined to obtain good discrimination power. The efficiency of our scheme is tested by recognition experiments on the handwritten numeral database CENPARMI, where SVM classifier with RBF kernel is used. The experimental results show the usefulness of our scheme and recognition rate of 99.10% is achieved.
Fabrication and Characteristics of X-ray Position Detection Sensor
Park, Hyung-Jun ; Kim, In-Su ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 535~540
DOI : 10.7471/ikeee.2015.19.4.535
A microstrip gas chamber (MSGC), applied to digital radiography system, was designed and constructed. The microstrip electrodes were fabricated with Chrome(Cr.). by photolithography process on Silicon(Si) wafer and glass substrate. The width of anode and cathode electrodes was
, respectively. The distance of the electrodes was
, and the active area was
. And the number of anode was 80. The microstrip electrodes were damaged when discharges occurred over the 600 V of anode voltage. As the result of experiments. It detected the typical output signals of the pulse width, 20 ns, under the condition that the detecting gas was Ar(90%) +
(10%), X-ray tube voltage was 42 kV, and tube current was 1 mA.
Endpoint Detection Using Both By-product and Etchant Gas in Plasma Etching Process
Kim, Dong-Il ; Park, Young-Kook ; Han, Seung-Soo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 541~547
DOI : 10.7471/ikeee.2015.19.4.541
In current semiconductor manufacturing, as the feature size of integrated circuit (IC) devices continuously shrinks, detecting endpoint in plasma etching process is more difficult than before. For endpoint detection, various kinds of sensors are installed in semiconductor manufacturing equipments, and sensor data are gathered with predefined sampling rate. Generally, detecting endpoint is performed using OES data of by-product. In this study, OES data of both by-product and etchant gas are used to improve reliability of endpoint detection. For the OES data pre-processing, a combination of Signal to Noise Ratio (SNR) and Principal Component Analysis (PCA),are used. Polynomial Regression and Expanded Hidden Markov model (eHMM) technique are applied to pre-processed OES data to detect endpoint.
Security Requirements of Personal Health Service
Kim, Sang-Kon ; Hwang, Hee-Joung ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 548~556
DOI : 10.7471/ikeee.2015.19.4.548
When the variety of personal health services are provided in the ICBM(IoT, Cloud, Bigdata, and Mobile) environment, the security requirements of personal health service(PHS) including privacy issues is proposed in this paper. Because it is expected that the services related to personal health are provided in the cloud environment, the security requirements of a cloud environment is firstly investigated and then security threats including direct and indirect threats in a cloud environment are analyzed in terms of the security of PHS. In addition, the security requirements of PHS is developed based on the security requirements of electronic medical record(EMR) for medical service in this paper, then the validity of the proposed security requirements is shown by the relation between security requirements of cloud environment and PHS to indicate that a security requriement is supported by several security requirements of PHS.
A Position Estimation of Quadcopter Using EKF-SLAM
Cho, Youngwan ; Hwang, Jaeyoung ; Lee, Heejin ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 557~565
DOI : 10.7471/ikeee.2015.19.4.557
In this paper, a method for estimating the location of a quadcopter is proposed by applying an EKF-SLAM algorithm to its flight control, to autonomously control the flight of an unmanned quadcopter. The usefulness of this method is validated through simulations. For autonomously flying the unmanned quadcopter, an algorithm is required to estimate its accurate location, and various approaches exist for this. Among them, SLAM, which has seldom been applied to the quadcopter flight control, was applied in this study to simulate a system that estimates flight trajectories of the quadcopter.
RCS Analysis for Improving the Performance of the Skin Tracking of KSLV-II
Lee, Hyun-Seung ; Lee, Eun-Gyu ; Lim, Jeong-Taek ; Choi, Jee-Hwan ; Kim, Chul-Young ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 566~572
DOI : 10.7471/ikeee.2015.19.4.566
In this paper, we calculate monostatic RCS(Radar Cross Section) and bistatic RCS for improving the Performance of the skin tracking of KSLV-II and the results were compared. EM(Electromagnetic) simulator was used for numerical analysis. For the two paths(L, S), after the vehicle was launched, RCS was calculated for region from 280 to 400 seconds. In the case of using the bistatic radar system, when the vehicle was launched to the L path, tracking performance was better when we receive RCS in Jeju than in Goheung. When the vehicle was launched to the S path, tracking performance was better when we receive RCS in Goheung than in Jeju. In the case of using the monostatic radar system, when the vehicle was launched to the L path, tracking performance was better when we receive RCS in Goheung than in Jeju. When the vehicle was launched to the S path, tracking performance was better when we receive RCS in Jeju than in Goheung.
Dual Mode Boost Converter for Energy Harvesting
Park, Hyung-Ryul ; Yeo, Jae-Jin ; Roh, JeongJin ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 573~582
DOI : 10.7471/ikeee.2015.19.4.573
This paper presents the design of dual mode boost converter for energy harvesting. The designed converter boosts low voltage from energy harvester through a startup circuit. When the voltage goes above predefined value, supplied voltage to startup circuit is blocked by voltage detector. Boost controller makes the boosted voltage into
. The proposed circuit consists of oscillator for charge pump, charge pump, pulse generator, voltage detector, and boost controller. The proposed converter is designed and fabricated using a
CMOS process. The designed circuit shows that minimum input voltage is 600mV, output is 3V and startup time is 20ms. The boost converter achieves 47% efficiency at a load current of 3mA.
Design of HEVC CABAC Encoder With Parallel Processing of Bypass Bins
Kim, Doohwan ; Moon, Jeonhak ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 583~589
DOI : 10.7471/ikeee.2015.19.4.583
In the HEVC CABAC, the probability model is updated after a bin is encoded and next bin is encoded based on the updated probability model. Conventional CABAC encoders can encode only one bin per cycle, which cannot increase the encoding throughput. The probability model does not need to be updated in the bypass bins. In this paper, a HEVC CABAC encoder is proposed to increase encoding throughput by parallel processing of bypass bins. The designed CABAC encoder can process either a regular bin or maximum 4 bypass bins in a cycle. On the average, it can process 1.15~1.92 bins in a cycle. Synthesized in 0.18 um technology, its gate count, maximum operating speed, and the maximum throughput are 78,698 gates, 136 MHz, and 261 Mbin/s, respectively.
A Design of a Tile Based Rasterizer Using Memory Hierarchy Structure
Kim, Do Hyun ; Kwak, Jae Chang ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 590~595
DOI : 10.7471/ikeee.2015.19.4.590
This paper proposes a design of efficient hierarchy structure in the tile based rasterizer. The proposed hierarchy structure avoids unnecessary calls of low level tile at which a calculation is not required. A low level tile is classified into three categories based on its maximum, minimum position, and inside outside test. The necessity of calculations on the corresponding low level tile can be determined by its classification. The overall amount of computations for graphic processing can be reduced by not calling for the low level tile with no calculation. The proposed hierarchy structure can reduce an execution time of graphic processing. It shows higher efficiency with the more vertex density of formulating 3D model.
Design of Unified Inverse Transformer for HEVC and VP9
Jung, Seulkee ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 596~602
DOI : 10.7471/ikeee.2015.19.4.596
In this paper, a unified inverse transformer is designed for HEVC and VP9. The proposed architecture performs all modes of HEVC and VP9 in the unified inverser transformer, such as
VP9 IADST and
IWHT. Same computations are used in HEVC IDCT and VP9 IDCT, except for the scales of the coefficients. Similarly, same computations are used in HEVC
IDST and VP9
IADST, except for the scales of the coefficients. Furthermore, HEVC IDCT, VP9 IDCT, and VP9 IADST are the subsets of upper level IDCTs. The proposed architecture reuses multipliers when the computation is identical. Also it shares adders and butterfly structures even when the multiplier coefficients are different. So it reduces the hardware size significantly. Synthesized in 0.18 um technology, the gate count is 456,442 gates. which achieved 22.6% reduction compared to conventional architectures.
A Study on the Indoor Comfort Control By Smart Comfort Algorithm
Yoon, Seok-Am ; Lee, Jeong-Il ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 603~609
DOI : 10.7471/ikeee.2015.19.4.603
Thermal comfort is one of the fundamental aspects of indoor environmental quality and it is strongly related to occupant satisfaction and energy used in building. In this paper, we proposes smart comfort algorithm that save energy and provide a pleasant and comfortable environment for workers by the indoor comfort conditions(Predictive Mean Vote) detection and controlling the temperature and humidity, air flow. Simulation results, heating and cooling control of the thermal comfort control can be compared with the existing general air conditioners reduces the power of 0.5kW and indoor comfort can be maintained. Also, It showed a 49.2% improvement in the light by lighting control algorithm.
Design of Electronic ID System Satisfying Security Requirements of Authentication Certificate Using Fingerprint Recognition
Lee, Chongho ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 610~616
DOI : 10.7471/ikeee.2015.19.4.610
In this paper, an electronic ID system satisfying security requirements of authentication certificate was designed using fingerprint recognition. The proposed electronic ID system generates a digital signature with forgery prevention, confidentiality, content integrity, and personal identification (=non-repudiation) using fingerprint information, and also encrypts, sends, and verify it. The proposed electronic ID system exploits fingerprint instead of user password, so it avoids leakage and hijacking. And it provides same legal force as conventional authentication certificate. The proposed electronic ID consists of 4 modules, i.e. HSM device, verification server, CA server, and RA client. Prototypes of all modules are designed and verified to have correct operation.
Implementation of Adult Authentication System Using Smartphone and Near-Field Communication
Lee, Chongho ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 617~624
DOI : 10.7471/ikeee.2015.19.4.617
In this paper, an adult authentication system based on authentication certificate was designed and implemented using smartphone and near-field communication. It has three advantages. First, it achieves easy, convenient, and fast authentication by using smartphone and near-field communication. Second, it achieves extremely high security and reliability by exploiting authentication certificate. Third, it achieves extremely low risk of personal information leakage by generating and sending only virtual identification code. Finally, it has a proper legal basis by Digital Signature Act. It consists of adult authentication module, near-field communication control module, policy server module, and database server module. A prototype of the proposed system was designed and implemented, and it was verified to have correct operation.
Design of an 8051 Microcontroller With Application-Specific Instructions and I/O Ports for Data Transmission
Kim, Jihye ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 4, 2015, Pages 625~631
DOI : 10.7471/ikeee.2015.19.4.625
In this paper, an 8051 microcontroller with application-specific instructions and I/O ports for data transmission is designed. The designed microcontoller includes two UART ports and one SMBus port to control external devices and to transmit data with them. Application-specific instruction is developed and added to the instruction set to exploit these I/O ports. So the designed microcontroller can perform multi-device control and multi-byte transmission. Also, it can reduce the code size of the application program. Especially, the designed microcontroller does not stall and can execute other programs during data transmission, which significantly increases its efficiency. Synthesized in 0.18 um technology, the area overhead due to application-specific instructions was negligible. Operations of all instructions and I/O ports were verified to run correctly on a FPGA board.