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Journal of IKEEE
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Institude of Korean Electrical and Electronics Engineers
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Volume 20, Issue 2 - Jun 2016
Volume 20, Issue 1 - Mar 2016
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An Effective TOA-based Localization Method with Adaptive Bias Computation
Go, Seung-Ryeol ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 1~8
DOI : 10.7471/ikeee.2016.20.1.001
In this paper, we propose an effective time-of-arrival (TOA)-based localization method with adaptive bias computation in indoor environments. The goal of the localization is to estimate an accurate target's location in wireless localization system. However, in indoor environments, non-line-of-sight (NLOS) errors block the signal propagation between target device and base station. The NLOS errors have significant effects on ranging between two devices for wireless localization. In TOA-based localization, finding the target's location inside the overlapped area in the TOA-circles is difficult. We present an effective localization method using compensated distance with adaptive bias computation. The proposed method is possible for the target's location to estimate an accurate location in the overlapped area using the measured distances with subtracted adaptive bias. Through localization experiments in indoor environments, estimation error is reduced comparing to the conventional localization methods.
Real Time Endpoint Detection in Plasma Etching Using Decision Making Algorithm
Noh, Ho-Taek ; Park, Young-Kook ; Han, Seung-Soo ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 9~15
DOI : 10.7471/ikeee.2016.20.1.009
The endpoint detection (EPD) is the most important technique in plasma etching process. In plasma etching process, the Optical Emission Spectroscopy (OES) is usually used to analyze plasma reaction. And Plasma Impedance Monitoring (PIM) system is used to measure the voltage, current, power, and load impedance of the supplied RF power during plasma process. In this paper, a new decision making algorithm is proposed to improve the performance of EPD in SiOx single layer plasma etching. To enhance the accuracy of the endpoint detection, both OES data and PIM data are utilized and a newly proposed decision making algorithm is applied. The proposed method successfully detected endpoint of silicon oxide plasma etching.
A Prediction Model of Timely Processing on Medical Service using Classification and Regression Tree
Lee, Jong-Chan ; Jeong, Seung-Woo ; Lee, Won-Young ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 16~25
DOI : 10.7471/ikeee.2016.20.1.016
Turnaround time (called, TAT) for imaging test, which is necessary for making a medical diagnosis, is directly related to the patient's waiting time and it is one of the important performance criteria for medical services. In this paper, we measured the TAT from major imaging tests to see it met the reference point set by the medical institutions. Prediction results from the algorithm of classification regression tree (called, CART) showed "clinics", "diagnosis", "modality", "test month" were identified as main factors for timely processing. This study had a contribution in providing means of prevention of the delay on medical services in advance.
Degradation of OFDM Signal Performance by Chromatic Dispersion in a Several 10 Gbit/s Mobile Front-haul Link
Won, Yong-Yuk ; Seo, Dongsun ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 26~30
DOI : 10.7471/ikeee.2016.20.1.026
In this paper, an inter-orthogonal frequency division multiplexing (OFDM) sub-carrier distortion due to fiber chromatic dispersion is investigated. The fiber chromatic dispersion induces phase difference among OFDM sub-carriers, resulting in non-symmetric peak to average power ratio (PAPR) inducing inter-OFDM distortion. Experiments to confirm the fiber dispersion are performed in a direct-detection optical front-haul link. Quadrature phase shift keying (QPSK) encoded OFDM symbols at 25 Gbit/s are transmitted over 100 km fiber and the resulting error vector magnitude (EVM) of 40 % is observed.
Hole-filling Algorithm Based on Extrapolating Spatial-Temporal Background Information for View Synthesis in Free Viewpoint Television
Kim, Beomsu ; Nguyen, Tien-Dat ; Hong, Min-cheol ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 31~44
DOI : 10.7471/ikeee.2016.20.1.031
This paper presents a hole-filling algorithm based on extrapolating spatial-temporal background information used in view synthesis for free-viewpoint television. A new background codebook is constructed and updated in order to extract reliable temporal background information. In addition, an estimation of spatial local background values is conducted to discriminate an adaptive boundary between the background region and the foreground region as well as to update the information about the hole region. The holes then are filled by combining the spatial background information and the temporal background information. In addition, an exemplar-based inpainting technique is used to fill the rest of holes, in which a priority function using background-depth information is defined to determine the order in which the holes are filled. The experimental results demonstrated that the proposed algorithm outperformed the other comparative methods about average 0.3-0.6 dB, and that it synthesized satisfactory views regardless of video characteristics and type of hole region.
A CMOS Interface Circuit for Vibrational Energy Harvesting with MPPT Control
Yang, Min-Jae ; Yoon, Eun-Jung ; Yu, Chong-Gun ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 45~53
DOI : 10.7471/ikeee.2016.20.1.045
This paper presents a CMOS interface circuit for vibration energy harvesting with MPPT (Maximum Power Point Tracking). In the proposed system a PMU (Power Management Unit) is employed at the output of a DC-DC boost converter to provide a regulated output with low-cost and simple architecture. In addition an MPPT controller using FOC (Fractional Open Circuit) technique is designed to harvest maximum power from vibration devices and increase efficiency of overall system. The AC signal from vibration devices is converted into a DC signal by an AC-DC converter, and then boosted through the DC-DC boost converter. The boosted signal is converted into a duty-cycled and regulated signal and delivered to loads by the PMU. A full-wave rectifier using active diodes is used as the AC-DC converter for high efficiency, and a DC-DC boost converter architecture using a schottky diode is employed for a simple control circuitry. The proposed circuit has been designed in a 0.35um CMOS process, and the designed chip occupies
. Simulation results shows that the maximum power efficiency of the entire system is 83.4%.
Novel Out-of-band Emission Measurement Method for Terrestrial DTV Transmitter using Pre-Compensation Method
Her, Young-Tae ; Kwon, Won-Hyun ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 54~60
DOI : 10.7471/ikeee.2016.20.1.054
In this paper, out-of-band emission regulations and measurement methods of terrestrial DTV broadcasting services are analyzed, and a novel method to evaluate the out-of-band emission characteristics of DTV transmitter is proposed. Experimental results show that proposed method can be easily used to measure the characteristics of DTV transmitter with inexpensive measuring equipments. With a few modifications, proposed method can be widely adopted to measure the RF performances of the general radio equipments efficiently.
A Study On Hardware Design for High Speed High Precision Neutron Measurement
Jang, Kyeong-Uk ; Lee, Joo-Hyun ; Lee, Seung-Ho ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 61~67
DOI : 10.7471/ikeee.2016.20.1.061
In this paper, a hardware design method is proposed for high speed high precision neutron radiation measurements. Our system is fabricated to use a high performance A/D Converter for digital data conversion of high precision and high speed analog signals. Using a neutron sensor, incident neutron radiation particles are detected; a precision microcurrent measurement module is also included: this module allows for more precise and rapid neutron radiation measurement design. The high speed high precision neutron measurement hardware system is composed of the neutron sensor, variable high voltage generator, microcurrent precision measurement component, embedded system, and display screen. The neutron sensor detects neutron radiation using high density polyethylene. The variable high voltage generator functions as a 0 ~ 2KV variable high voltage generator that is robust against heat and noise; this generator allows the neutron sensor to perform normally. The microcurrent precision measurement component employs a high performance A/D Converter to precisely and swiftly measure the high precision high speed microcurrent signal from the neutron sensor and to convert this analog signal into a digital one. The embedded system component performs multiple functions including neutron radiation measurement for high speed high precision neutron measurements, variable high voltage generator control, wired and wireless communications control, and data recording. Experiments using the proposed high speed high precision neutron measurement hardware shows that the hardware exhibits superior performance compared to that of conventional equipment with regard to measurement uncertainty, neutron measurement rate, accuracy, and neutron measurement range.
Design and Implementation of UWB Antenna with Dual Band Rejection Characteristics for Mobile Handset
Cho, Young Min ; Yang, Woon Geun ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 68~74
DOI : 10.7471/ikeee.2016.20.1.068
In this paper, we present a compact planar dual band rejection Ultra Wide Band(UWB) antenna with folded parasitic element. The proposed antenna is consist of a hexagonal planar radiation patch antenna with a folded parasitic element which is located over the top and bottom surface. In contrast with other antenna which rejects single band using one method, folded parasitic element rejects dual band using one simple structure. Owing to folded parasitic element, dual-rejected properties are achieved in the Worldwide Interoperability for Microwave Access(WiMAX), C-band, and Wireless Local Area Network(WLAN) bands. The bandwidth of the proposed antenna was measured as 3.1~10.6 GHz for voltage standing wave ratio(VSWR) less than 2, except for the dual rejection bands of 3.4~4.2 GHz and 5.15~6.00 GHz.
Design of a SIMT architecture GP-GPU Using Tile based on Graphic Pipeline Structure
Kim, Do-Hyun ; Kim, Chi-Yong ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 75~81
DOI : 10.7471/ikeee.2016.20.1.075
This paper proposes a design of the tile based on graphic pipeline to improve the graphic application performance in SIMT based GP-GPU. The proposed Tile based on graphics pipeline avoids unnecessary graphic processing operation, and processes the rasterization step in parallel. The massive data processing in parallel through SIMT architecture improve the computational performance, thereby improving the 3D graphic pipeline performance. The more vertex data of 3D model, the higher performance. The proposed structure was confirmed to improve processing performance of up to 3 times from about 1.18 times as compared to 'RAMP' and previous studies.
Line Segment Detection Algorithm Using Improved PPHT
Lee, Chanho ; Moon, Ji-hyun ; Nguyen, Duy Phuong ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 82~88
DOI : 10.7471/ikeee.2016.20.1.082
The detection rate of Progressive Probability Hough Transform(PPHT) is decreased when a lot of noise components exist due to an unclear or complex original image although it is quite a good algorithm that detects line segments accurately. In order to solve the problem, we propose an improved line detecting algorithm which is robust to noise components and recovers slightly damaged edges. The proposed algorithm is based on PPHT and traces a line segments by pixel and checks of it is straight. It increases the detection rate by reducing the effect of noise components and by recovering edge patterns within a limited pixel size. The proposed algorithm is applied to a lane detection method and the false positive detection rate is decreased by 30% and the line detection rate is increased by 15%.
Implementation of the SIMT based Image Signal Processor for the Image Processing
Hwang, Yun-Seop ; Jeon, Hee-Kyeong ; Lee, Kwan-ho ; Lee, Kwang-yeob ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 89~93
DOI : 10.7471/ikeee.2016.20.1.089
In this paper, we proposed SIMT based Image Signal Processor which can apply various image preprocessing algorithms and allow parallel processing of application programs such as image recognition. Conventional ISP has the hard-wired image enhancement algorithm of which the processing speed is fast, but there was difficult to optimize performance depending on various image processing algorithms. The proposed ISP improved the processing time applying SIMT architecture and processed a variety of image processing algorithms as an instruction based processor. We used Xilinx Virtex-7 board and the processing time compared to cell multicore processor, ARM Cortex-A9, ARM Cortex-A15 was reduced by about 71 percent, 63 percent and 33 percent, respectively.
Prediction of Multi-Physical Analysis Using Machine Learning
Lee, Keun-Myoung ; Kim, Kee-Young ; Oh, Ung ; Yoo, Sung-kyu ; Song, Byeong-Suk ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 94~102
DOI : 10.7471/ikeee.2016.20.1.094
This paper proposes a new prediction method to reduce times and labor of repetitive multi-physics simulation. To achieve exact results from the whole simulation processes, complex modeling and huge amounts of time are required. Current multi-physics analysis focuses on the simulation method itself and the simulation environment to reduce times and labor. However this paper proposes an alternative way to reduce simulation times and labor by exploiting machine learning algorithm trained with data set from simulation results. Through comparing each machine learning algorithm, Gaussian Process Regression showed the best performance with under 100 training data and how similar results can be achieved through machine-learning without a complex simulation process. Given trained machine learning algorithm, it's possible to predict the result after changing some features of the simulation model just in a few second. This new method will be helpful to effectively reduce simulation times and labor because it can predict the results before more simulation.
Fast Transient Response Techniques for PWM Buck Converter
Seok, Jinmin ; Suh, Jung-Duk ; Kong, Bai-Sun ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 103~106
DOI : 10.7471/ikeee.2016.20.1.103
PWM buck converters usually use a type-III error amplifier. Since this amplifier has a big capacitor with slow slew rate, they can generate an unintended large overshoot/undershoot at the output when a large load current change occurs. They can also respond slowly by varying the reference voltage. In order to increase battery lifetime, power supplies require a various range of load current and output voltage. PWM buck converter also should have a characteristic of both fast load response and reference tracking. This paper surveys a few recent techniques for reducing the settling time, and discusses their merits and limitations.
Implementation of 868/915 MHz LR-WPAN Transceiver for IoT Systems
Lee, Jong-Bae ; Lee, Seongsoo ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 107~110
DOI : 10.7471/ikeee.2016.20.1.107
In this paper, an IEEE 802.15.4 LR-WPAN 868/915 MHz ZigBee transceiver for IoT systems was designed and implemented. Non-coherent demodulation was exploited to satisfy
frequency offset recommended in IEEE 802.15.4 LR-WPAN. Variable bitrate was supported according to operation modes. SPI module was embedded to connect various MCUs. The designed Zigbee transceiver was described in Verilog HDL and it was synthesized and verified in
process. Its gate count was about 32,000 gates.
Reusing Search Window Data and Exploiting Early Termination in Variable Block Size Motion Estimation
Park, Taewook ; Hur, Ahrum ; Lee, Seongsoo ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 111~114
DOI : 10.7471/ikeee.2016.20.1.111
In HEVC, motion estimation is performed independently for each variable block size. So it requires several times of search window data, and also it is difficult to exploit early termination. In this paper, a new method is proposed to exploit search window data and early termination in variable block size. When applied to TZS algorithm, it reduces pixel comparison and search window data accesses to 1/3.7 ~ 1/2.9 with negligible image quality degradation.
Development of the Alarm System for Preventing of the Lonely Death of Elderly
Kim, Jong-Tae ; Kong, Jung-Shik ; Kim, Jin-Geol ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 115~118
DOI : 10.7471/ikeee.2016.20.1.115
This paper presents development of the alarm system for preventing of the lonely death of the elderly. The population of the elderly people are growing rapidly. So, Some problems is caused by the senior citizen who lives alone, because of their death alone. In this paper, we propose the alarm system that can announce the state of the elderly who live alone. The system can check the pulse and oxygen saturation continuously. If biological signals are not good, the system can announce the information of the elderly to family and neighborhood. This system is verified by SpO2 Simulator.
LDO Regulator with Pseudo Resistor Using Feedback Network
Jung, Jun-Mo ;
Journal of IKEEE, volume 20, issue 1, 2016, Pages 119~122
DOI : 10.7471/ikeee.2016.20.1.119
In this paper, we propose LDO regulator to operate using Pseude resistor instead of widely used Feedback resistor in conventional LDO regulator. Proposed Feedback network using Pseudo resistor has smaller area than the conventional feedback resistor and plays the role of an conventional LDO regulator. Thus, it has been proposed to compensate for the disadvantages of LDO regulator with noise. Although proposed LDO regulator compared with conventional LDO regulator has similar performance, this LDO regulator provide higher efficiency by reducing the overshoot and decreasing the area. This circuit was designed to using a Dongbu Hitek 0.18um CMOS process.