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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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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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Design of Sub-pixel Interpolation Circuit for Real-time Multi-decoder Supporting 4K-UHD Video Images
Lee, Sujung ; Cho, Kyeongsoon ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 1~9
DOI : 10.7471/ikeee.2015.19.1.001
This paper proposes the design of sub-pixel interpolation circuit for real-time multi-decoder supporting 4K-UHD video images. The proposed sub-pixel interpolation circuit supports H.264, MPEG-4, VC-1 and new video compression standard HEVC. The common part of the interpolation algorithm used in each video compression standard is shared to reduce the circuit size. An intermediate buffer is effectively used to reduce the circuit size and optimize the performance. The proposed sub-pixel interpolation circuit was synthesised by using 130nm standard cell library. The synthesized gate-level circuit consists of 122,564 gates and processes 35~86 image frames per second for 4K-UHD video at the maximum operation frequency of 200MHz. Therefore, the proposed circuit can process 4K-UHD video in real time.
FPGA Implementation for Real Time Sobel Edge Detector Block Using 3-Line Buffers
Park, Chan-Su ; Kim, Hi-Seok ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 10~17
DOI : 10.7471/ikeee.2015.19.1.010
In this Paper, an efficient method of FPGA based design and implementation of Sobel Edge detector block using 3-Line buffers is presented. The FPGA provides the proper and sufficient hardware for image processing algorithms with flexibility to support Sobel edge detection algorithm. A pipe-lined method is used to implement the edge detector. The proposed Sobel edge detection operator is an model using of Finite State Machine(FSM) which executes a matrix mask operation to determine the level of edge intensity through different of pixels on an image. This approach is useful to improve the system performance by taking advantage of efficient look up tables, flip-flop resources on target device. The proposed Sobel detector using 3-line buffers is synthesized with Xilinx ISE 14.2 and implemented on Virtex II xc2vp-30-7-FF896 FPGA device. Using matlab, we show better PSNR performance of proposed design in terms of 3-Line buffers utilization.
Isolation Enhancement of Internal MIMO Antenna
Jung, Pil Hyun ; Yang, Woon Geun ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 18~26
DOI : 10.7471/ikeee.2015.19.1.018
In this paper, we proposed and evaluated the performance of an internal MIMO (Multiple Input Multiple Output) antenna for multiband operations including LTE (Long Term Evolution) 700/2300/2500. And to enhance the isolation characteristic, a parasitic element is designed and applied. The proposed single antenna has a volume of
, and the ground plane is
. The parasitic element used for enhancing the isolation of the antenna was designed with a copper on FR4 sized
, and the pattern size is
. Simulated and measured results showed that LTE 700/2300/2500, DCS (Digital Cellular Service: 1710-1880MHz), K-PCS (Korea-Personal Communication Service: 1750-1870MHz), US-PCS (US-Personal Communication Service: 1850-1990MHz), WCDMA (Wideband Code Division Multiple Access: 1920-2170MHz), Wibro (2300-2390MHz), Bluetooth (2400-2483MHz), WLAN (Wireless Local Area Network: 2400-2483.5MHz), US-WiMAX (US-World interoperability for Microwave Access: 2400-2590MHz) frequency bands were covered with
values less than -6dB (VSWR < 3). Simulated and measured results on
at 730MHz for the firstly designed MIMO antenna showed -5.50dB and -5.65dB, respectively. When with the parasitic element at the separated ground plane to enhance the isolation performance, -10.33dB and -12.90dB are obtained for the simulation and measurement, so the enhanced isolation performance at lower frequency band (617-867MHz) is confirmed.
A Flexible and Tunable Microwave Photonic Filter Based on Adjustable Optical Frequency Comb Source
Tran, Thanh Tuan ; Seo, Dongsun ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 27~32
DOI : 10.7471/ikeee.2015.19.1.027
A flexible and tunable microwave photonic filter based on adjustable optical frequency comb source is demonstrated. We use a combination of a dual parallel Mach Zehnder modulator and an intensity modulator to generate fifteen comb lines with proper weights to implement a desired filter. The optical comb weights, corresponding to the tap coefficients of the filter, are flexibly changed by adjusting the operation parameters of the modulators. The achieved bandwidth and stopband attenuation of the tunable filter are 0.7 GHz and 20 dB, respectively. In addition, we overcome the undesired low frequency suppression appeared in a conventional scheme by applying a dual parallel Mach Zehnder modulator for single sideband suppressed carrier modulation.
Application of Matrix Adaptive Regularization Method for Human Thorax Image Reconstruction
Jeon, Min-Ho ; Kim, Kyung-Youn ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 33~40
DOI : 10.7471/ikeee.2015.19.1.033
Inverse problem in electrical impedance tomography (EIT) is highly ill-posed therefore prior information is used to mitigate the ill-posedness. Regularization methods are often adopted in solving EIT inverse problem to have satisfactory reconstruction performance. In solving the EIT inverse problem, iterative Gauss-Newton method is generally used due to its accuracy and fast convergence. However, its performance is still suboptimal and mainly depends on the selection of regularization parameter. Although, there are few methods available to determine the regularization parameter such as L-curve method they are sometimes not applicable for all cases. Moreover, regularization parameter is a scalar and it is fixed during iteration process. Therefore, in this paper, a novel method is used to determine the regularization parameter to improve reconstruction performance. Conductivity norm is calculated at each iteration step and it used to obtain the regularization parameter which is a diagonal matrix in this case. The proposed method is applied to human thorax imaging and the reconstruction performance is compared with traditional methods. From numerical results, improved performance of proposed method is seen as compared to conventional methods.
Dielectric Layer Planarization Process for Silicon Trench Structure
Cho, Il Hwan ; Seo, Dongsun ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 41~44
DOI : 10.7471/ikeee.2015.19.1.041
Silicon trench process for bulk fin field effect transistor (finFET) is suggested without using chemical mechanical polishing (CMP) that cause contamination problems with chemical stuff. This process uses thickness difference of photo resistor spin coating and silicon nitride sacrificial layer. Planarization of silicon oxide and silicon trench formation can be performed with etching processes. In this work 50 nm silicon trench is fabricated with AZ 1512 photo resistor and process results are introduced.
Design of Low-Complexity 128-Bit AES-CCM
IP for IEEE 802.15.4-Compatible WPAN Devices
Choi, Injun ; Lee, Jong-Yeol ; Kim, Ji-Hoon ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 45~51
DOI : 10.7471/ikeee.2015.19.1.045
Recently, as WPAN (Wireless Personal Area Network) becomes the necessary feature in IoT (Internet of Things) devices, the importance of data security also hugely increases. In this paper, we present the low-complexity 128-bit AES-
hardware IP for IEEE 802.15.4 standard. For low-cost and low-power implementation which is essentially required in IoT devices, we propose two optimization methods. First, the folded AES(Advanced Encryption Standard) processing core with 8-bit datapath is presented where composite field arithmetic is adopted for reduced hardware complexity. In addition, to support
mode defined in IEEE 802.15.4, we propose the mode-toggling architecture which requires less hardware resources and processing time. With the proposed methods, the gate count of the proposed AES-
IP can be lowered up to 57% compared to the conventional architecture.
Design and Implementation of the Diseases Diagnosis System Using The Cantilever Micro-Arrays
Jung, Seung-Pyo ; Choi, Jun-Kyu ; Lee, Jung-Hoon ; Park, Ju-Sung ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 52~57
DOI : 10.7471/ikeee.2015.19.1.052
The disease diagnosis system has been developed using the thin nitride(Si3N4) cantilever arrays which can measure the difference of capacitances between sensor and reference. The system consists of 32-bits RISC(Reduced Instruction Set Computer), RAM/Flash, bus, communication IP's, ADC(Analog Digital Converter) board, and LCD display. The marker selection method, which give us the good accuracy from reasonal numbers of markers, is suggested. The developed system has the resolution under 1fF and can detect 10nM concentration of Thrombin.
A Study on the Moving Detection Algorithm for Mobile Intelligent Management System Based on the Cloud
Park, Sung-Ki ; Kim, Ok-Hwan ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 58~63
DOI : 10.7471/ikeee.2015.19.1.058
This study suggested the mobile intelligent management system based on the cloud service. The mobile intelligent management system are composed of cloud server, middleware and sensor networks. Each modules are controlled on mobile environment and observed operating status of each apparatus for environment. In this pater, the image-based moving detection algorithm applied in order to detect an intruder and average 12.3% are measured in moving detection experiments. it was confirmed the validity of the security device.
Automation of Fuel Filter Manufacturing Process Via IT Convergence
Yun, Suck-Chang ; Han, Woo-Hyun ; Yoon, Dal-Hwan ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 64~72
DOI : 10.7471/ikeee.2015.19.1.064
In this paper, we have developed the gantry automation system via information technology (IT) to improve the productivity of fuel filter manufacturing process. The monitoring system of manufacturing process plays an important role in analyzing the defective products as well as improving the production yield rate. The experimental results of 3 months with 10000 samples validate that the error rate is decreased from 0.65 % to 0.45 %. Also, the defect of raw material is decreased via monitoring of material tools which can notify the time for replacement and accurate insertion of raw materials to the loader. The productivity is increased by reducing the process time from 94.7 sec to 78.8 sec per raw material through comparing the whole manufacturing courses : from inserting of raw material to outcome of product. The process time is decreased by 20.2 % by automation of inserting and outcome course. Moreover, safety of worker as well as reduction of transfer time are highly related with increase of productivity.
Maximum Boost Space Vector Pulse-Width Modulation Strategy of Z-Source Inverters
Kim, Seong Hwan ; Park, Jang Hyun ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 73~79
DOI : 10.7471/ikeee.2015.19.1.073
In this paper, maximum boost space vector pulse-width modulation(MBSVPWM) strategy of Z-Source Inverters(ZSIs) is proposed. Conventional space vector pulse-width modulation(SVPWM) method of Voltage Source Inverters(VSIs) is modified to produce unique PWM patterns that realize the maximum boost control of ZSIs. This proposed method minimizes the switching power losses of ZSIs by reducing the numbers of the shoot-through states. Moreover, some switches keep ON state and the switching transitions do not occur during the specific sectors. An experimental system has been built and tested to verify the effectiveness of the proposed strategy.
Measurement Technique of Ozone Density by Using UV Sensor System
Trung, Nguyen Huu ; Van Men, Le ; Van Hieu, Nguyen ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 80~86
DOI : 10.7471/ikeee.2015.19.1.080
There are many studies and products using a test paper impregnated with chemical solution can react with ozone. The color of a test paper can indicate the concentration of ozone. The purpose of this research is to design and manufacture a system using ultraviolet light source to measure the ozone density. This new technique is based on the characteristic of decomposition from ozone into oxygen under ultraviolet light. We used two sources of ultraviolet light including UV lamp and UVLED to determine the decomposition of ozone. This system is built with the electronic components, sensors and sealed pump tube to measure the ozone density in units of
,ppm,ppb. In this paper,, we present some initial results of measuring the ozone density from ozone generator after completing inspection for safety.
A 145μW, 87dB SNR, Low Power 3rd order Sigma-Delta Modulator with Op-amp Sharing
Kim, Jae-Bung ; Kim, Ha-Chul ; Cho, Seong-Ik ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 87~93
DOI : 10.7471/ikeee.2015.19.1.087
In this paper, a
, 87dB SNR, Low power 3rd order Sigma-Delta Modulator with Op-amp sharing is proposed. Conventional architecture with analog path and digital path is improved by adding a delayed feed -forward path for disadvantages that coefficient value of the first integrator is small. Proposed architecture has a larger coefficient value of the first integrator to remove the digital path. Power consumption of proposed architecture using op-amp sharing is lower than conventional architecture. Simulation results for the proposed SDM designed in
CMOS technology with power supply voltage 1.8V, signal bandwidth 20KHz and sampling frequency 2.8224MHz shows SNR(Signal to Noise Ratio) of 87dB, the power consumption of
50V Power MOSFET with Improved Reverse Recovery Characteristics Using an Integrated Schottky Body Diode
Lee, Byung-Hwa ; Cho, Doo-Hyung ; Kim, Kwang-Soo ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 94~100
DOI : 10.7471/ikeee.2015.19.1.094
In this paper, 50V power U-MOSFET which replace the body(PN) diode with Schottky is proposed. As already known, Schottky diode has the advantage of reduced reverse recovery loss than PN diode. Thus, the power MOSFET with integrated Schottky integrated can minimize the reverse recovery loss. The proposed Schottky body diode U-MOSFET(SU-MOS) shows reduction of reverse recovery loss with the same transfer, output characteristic and breakdown voltage. As a result, 21.09% reduction in peak reverse current, 7.68% reduction in reverse recovery time and 35% improvement in figure of merit(FOM) are observed when the Schottky width is
and the Schottky barrier height is 0.8eV compared to conventional U-MOSFET(CU-MOS). The device characteristics are analyzed through the Synopsys Sentaurus TCAD tool.
Anaysis of Small-sized Power Connectors for Mobile Device Batteries
Lee, Keun-Myoung ; Oh, Ung ; Yoo, Sung-Kyu ; Song, Byeong-Suk ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 101~109
DOI : 10.7471/ikeee.2015.19.1.101
As the number of smartphone users grows, number of applications and the expected overall functionality in a smartphone grow simultaneously. With ever-so increasing expectations comes intense competition to squeeze in myriads of functions in a limited space that is only getting 'slimmer' by the year. In order to achieve this, companies often decrease the size of components in smartphones - battery connectors in particular. While they may fit, smaller battery connectors have their disadvantages due to the heat generated by the high current flow in the circuits. In collaborating with Korea's leading battery connector manufacturers, this research presents current issues and design concepts that should be considered when engineers design power connectors based on their electrical and thermal analysis.
A Novel Structure for the Improved Switching Time of 50V Class Vertical Power MOSFET
Cho, Doohyung ; Park, Kunsik ; Kim, Kwangsoo ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 110~117
DOI : 10.7471/ikeee.2015.19.1.110
In this paper, a novel trench power MOSFET using a Separate-W-gated technique MOSFET (SWFET) is proposed. Because the SWFET has a very low
compared to other forms of technology, it can be applied to high-speed power systems. The results found that the SWFET-applied
was decreased by 40% when compared to simply using the more conventional trench gate MOSFET.
(input capacitance :
(output capacitance :
(reverse recovery capacitance :
) were improved by 24%, 40%, and 50%, respectively. The switching characteristics of the inverter circuit shows a 24.9% enhancement of reverse recovery time, and the power efficiency of the DC-DC buck converter increased by 14.2%. In addition, the proposed SWFET does not require additional process steps and There was no degradation in the electrical performance of the current-voltage and on-resistance.
A Study on the Charge Controller for Solar Street Lamp by Direct Duty Ratio Control
Jang, Han-Gi ; Lim, Jung-Yeol ;
Journal of IKEEE, volume 19, issue 1, 2015, Pages 118~123
DOI : 10.7471/ikeee.2015.19.1.118
According to the recent report, solar street lamp connected to a non Maximum Power Point Tracking(MPPT) charger, can lead to a system-wide decline in power output with as much as 30%. This paper proposes the charge controller with direct duty ration control for 250W solar street lamp in order to improve the efficiency of photovoltaic from these output power reduction. This paper covers the Pulse Width Modulation(PWM) controller and power conversion topology and analyze the MPPT method for charge controller. The power conversion part consists of push pull converter based on PWM controller using 8bit MCU in order to have lower manufacturing cost. The PWM controller with direct duty ratio control algorithm is constantly tracking the maximum power point of photovoltaic module and increases energy output power. The test results shows 97.1~97.4% MPPT efficiency and the experimental hardware is implemented based on the solar simulator condition for 241W. Thus, the implemented charge controller shows its feasibility for the real application, especially under solar street lamp.