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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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Institude of Korean Electrical and Electronics Engineers
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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
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High Efficient Viola-Jones Detection Framework for Real-Time Object Detection
Park, Byeong-Ju ; Lee, Jae-Heung ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 1~7
DOI : 10.7471/ikeee.2014.18.1.001
In this paper, we suggest an improved Viola-Jones detection framework for the efficient feature selection and the fast rejection method of the sub-window. Our object detector has low computational complexity because it rejects sub-windows until specific threshold. Owing to using same framework, detection performance is same with the existing Viola-Jones detector. We measure the number of average feature calculation about MIT-CMU test set. As a result of the experiment, the number of average feature calculation is reduced to 45.5% and the detection speed is improved about 58.5% compared with the previous algorithm.
Image Reconstruction with Prior Information in Electrical Resistance Tomography
Kim, Bong Seok ; Kim, Sin ; Kim, Kyung Youn ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 8~18
DOI : 10.7471/ikeee.2014.18.1.008
Electrical resistance tomography (ERT) has high temporal resolution characteristics therefore it is used as an alternative technique to visualize two-phase flows. The image reconstruction in ERT is highly non-linear and ill-posed hence it suffers from poor spatial resolution. In this paper, the inverse problem is solved with homogeneous data used as a prior information to reduce the condition number of the inverse algorithm and improve the spatial resolution. Numerical experiments have been carried out to illustrate the performance of the proposed method.
Wideband Flat Optical Frequency Comb Generated from a Semiconductor Based 10 GHz Mode-Locked Laser with Intra-cavity Fabry-Perot Etalon
Leaird, Daniel E. ; Weiner, Andrew M. ; Seo, Dongsun ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 19~24
DOI : 10.7471/ikeee.2014.18.1.019
We report stable, wideband, flat-topped, 10 GHz optical frequency comb generation from a semiconductor-based mode-locked ring laser with an intra-cavity high finesse Fabry-Perot etalon. We demonstrate a stable 10 GHz comb with greater than 200 lines within a spectral power variation below 1 dB, which is the largest value obtained from a similar mode-locked laser in our knowledge. Greater than 20 dB of the spectral peak to deep ratio at 0.02 nm resolution, ~92 femtosecond timing jitter over 1 kHz to 1 MHz range, and non-averaged time traces of pulses confirm very stable optical frequency comb lines.
The SCR-based ESD Protection Circuit with High Latch-up Immunity for Power Clamp
Choi, Yong-Nam ; Han, Jung-Woo ; Nam, Jong-Ho ; Kwak, Jae-Chang ; Koo, Yong-Seo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 25~30
DOI : 10.7471/ikeee.2014.18.1.025
In this paper, SCR(Silicon Controlled Rectifier)-based ESD(Electrostatic Discharge) protection circuit for power clamp is proposed. In order to improve latch-up immunity caused by low holding voltage of the conventional SCR, it is modified by inserting n+ floating region and n-well, and extending p+ cathode region in the p-well. The resulting ESD capability of our proposed ESD protection circuit reveals a high latch-up immunity due to the high holding voltage. It is verified that electrical characteristics of proposed ESD protection circuit by Synopsys TCAD simulation tool. According to the simulation results, the holding voltage is increased from 4.61 V to 8.75 V while trigger voltage is increased form 27.3 V to 32.71 V, respectively. Compared with the conventional SCR, the proposed ESD protection circuit has the high holding voltage with the same triggering voltage characteristic.
High Voltage Transformer Design using Self-Resonant Characteristics of Transformer
Lee, Sueng-Hwan ; Cho, Dae-Kweon ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 31~36
DOI : 10.7471/ikeee.2014.18.1.031
In this paper, self-resonant characteristics of transformers were analyzed in accordance with changes of characteristics regarding to the stray capacitance, the volume of winding and the winding ratio were organized by formulas. Generally, the stray capacitance is considered as an unnecessary factor in processing transformers design as well as one of the inherent characteristics. In particular, these characteristics can be appeared clearly in the high frequency driving and Electrical resonance occurs in transformer, according to coupling with a magnetic factor at a particular frequency. In the case of high-voltage output applications, such as medical equipments, It is required to output high-voltage gain. Therefor, If Self-Resonant Characteristic is applied to High-Voltage transformer design, Not only the transformer and circuit but also related the system size can be reduced. So we propose it as one of additional high voltage transformer design methods.
A High Current Efficiency CMOS LDO Regulator with Low Power Consumption and Small Output Voltage Variation
Rikan, Behnam Samadpoor ; Abbasizadeh, Hamed ; Kang, Ji-Hun ; Lee, Kang-Yoon ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 37~44
DOI : 10.7471/ikeee.2014.18.1.037
In this paper we present an LDO based on an error amplifier. The designed error amplifier has a gain of 89.93dB at low frequencies. This amplifier`s Bandwidth is 50.8MHz and its phase margin is
. Also we proposed a BGR. This BGR has a low output variation with temperature and its PSRR at 1 KHz is -71.5dB. For a temperature variation from
we have just 9.4mV variation in 3.3V LDO output. Also it is stable for a wide range of output load currents [0-200mA] and a
output capacitor and its line regulation and especially load regulation is very small comparing other papers. The PSRR of proposed LDO is -61.16dB at 1 KHz. Also we designed it for several output voltages by using a ladder of resistors, transmission gates and a decoder. Low power consumption is the other superiority of this LDO which is just 1.55mW in full load. The circuit was designed in
Design and Implementation of Damage Information System for Integrated Management of Waterfront Structures
Yun, Kwonyoung ; Son, Jongkwon ; Kim, Juhyeong ; Kwon, Joonho ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 45~56
DOI : 10.7471/ikeee.2014.18.1.045
Recently, damages from disasters such as downpours, earthquakes and typhoons are increasing throughout the world. The downpour days of Korean Peninsula are also increasing every year due to rapid climate change. According to statistics over the last 30 years of the earthquakes in Korean Peninsula, the probability of a future earthquake is very high. In addition, super typhoons will hit Korean Peninsula due to the temperature rise in the nearby sea caused by the deepening of global warming. Thus, damage costs of the waterfront structures by natural disasters are also growing. But damage information system for integrated management of waterfront structures are insufficient. In this paper, we designed and implemented a damage information system for integrated management of waterfront structures. First, we classified damage information caused by natural disaster. Then we designed the databases of damage information and implemented damage information system. Lastly, we checked operations and the feasibility by testing queries on the proposed system.
A Study on Self-Localization of Home Wellness Robot Using Collaboration of Trilateration and Triangulation
Lee, Byoungsu ; Kim, Seungwoo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 57~63
DOI : 10.7471/ikeee.2014.18.1.057
This paper is to technically implement the sensing platform for Home-Wellness Robot. The self-Localization of indoor mobile robot is very important for the sophisticated trajectory control. In this paper, the robot`s self-localization algorithm is designed by RF sensor network and fuzzy inference. The robot realizes its self-localization, using RFID sensors, through the collaboration algorithm which uses fuzzy inference for combining the strengths of triangulation and triangulation. For the triangulation self-Localization, RSSI is implemented. TOA method is used for realizing the triangulation self-localization. The final improved position is, through fuzzy inference, made by the fusion algorithm of the resultant coordinates from trilateration and triangulation in real time. In this paper, good performance of the proposed self-localization algorithm is confirmed through the results of a variety of experiments in the base of RFID sensor network and reader system.
Standardized Description Method of Image Acquisition Characteristics Tests for Image Sensors and Modules
Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 64~76
DOI : 10.7471/ikeee.2014.18.1.064
In the image acquisition tests of image sensors and modules, how to compare pixel values, how to digitize "defect", and how to determine "fault" are extremely varied from test equipments. Therefore, setup of test equipments for image acquisition characteristics should be customized for target devices under test. In general, test procedures are delivered as technical documents in not standardized but arbitrary formats. So test equipment should be manually programmed fitting individual setup condition. This costs huge time and effort and has high risk of human error. In this paper, the standardized description method is proposed to apply to almost all existing tests where various tests are described in a single framework.
Standard Image Acquisition Characteristics Tests for Image Sensors and Modules
Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 77~95
DOI : 10.7471/ikeee.2014.18.1.077
In general, image acquisition characteristics tests of image sensors and modules vary widely according to the characteristics of image sensors and modules under test, the application purpose of target devices where image sensors and modules are mounted, and the functions of test equipments. However, some de facto standard tests are frequently used in industry fields. They differ only in several parameters e.g. thresholds for fault detection, and they can be applied to most image sensors and modules. In this paper, 11 typical tests are explained in detail, and they are described in a simple and clear form under single framework, which significantly reduces errors and saves efforts.
Battery Lifetime Enhancement Based on Recovery Effect
Lee, Jong-Bae ; Lee, Seongsoo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 96~105
DOI : 10.7471/ikeee.2014.18.1.096
This paper proposes a battery lifetime enhancement method based on the nonlinear discharge charisteristics called recovery effect. In general, the stored energy in a battery is considered in the prediction of battery lifetime. However, due to the chemical reaction in a battery, more energy can be drawn from a battery when it is not continuously but intermittently discharged, which is called recovery effect. In the proposed method, several battery cells are alternately discharged, and some battery cells rest while maintaining the system power supply. This makes recovery effect of battery cells, which extends battery lifetime. In the experiment, battery lifetime increases about 7% in the alternating discharge of two battery cells, when compared with conventional parallel discharge.
A Speed-up Method of HOG Pedestrian Detector in Advanced SIMD Architecture
Kwon, Ki-Pyo ; Lee, Jae-Heung ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 106~113
DOI : 10.7471/ikeee.2014.18.1.106
A pedestrian detector can be applied for various purposes such as monitoring or counting the number of people in some place, or detecting the people plunging in the driveway. There was a lot of related research. But, the detection speed is slow in embedded system because of the limited computing power. An algorithm for fast pedestrian detector using HOG in ARM SIMD architecture is presented in this paper. There is a way to quickly remove the background of image and to improve the detection speed using NEON parallel technique. When we tested with INRIA Person Dataset, the proposed pedestrian detector improves the speed by 3.01 times than previous one.
Improvement of Production Process based on Performance Evaluation System of Unified Heater
Han, Woo-Hyun ; Yoon, Dal-Hwan ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 114~118
DOI : 10.7471/ikeee.2014.18.1.114
This paper presents improvement of the production process of a unified fuel heater with the help of the performance evaluation system. In order to enhance a starting capability of diesel-engine car, the unified fuel heater is proposed, which consists of main body, upper plate, stopper, lower plate, PTC, screw, bimetal and terminals. In the proposed heater, the sensor is combined with heater body not only to maximize the performance of car but also to reduce the production cost. The performance test chamber is proposed to evaluate the performance of heater. Especially, an effective manufacturing progress for assembling the heater elements can cut down expenses.
CMOS ROIC for MEMS Acceleration Sensor
Yoon, Eun-Jung ; Park, Jong-Tae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 119~127
DOI : 10.7471/ikeee.2014.18.1.119
This paper presents a CMOS readout circuit for MEMS(Micro Electro Mechanical System) acceleration sensors. It consists of a MEMS accelerometer, a capacitance to voltage converter(CVC) and a second-order switched-capacitor
modulator. Correlated-double-sampling(CDS) and chopper-stabilization(CHS) techniques are used in the CVC and
modulator to reduce the low-frequency noise and DC offset. The sensitivity of the designed CVC is 150mV/g and its non-linearity is 0.15%. The duty cycle of the designed
modulator output increases about 10% when the input voltage amplitude increases by 100mV, and the modulator`s non-linearity is 0.45%. The total sensitivity is 150mV/g and the power consumption is 5.6mW. The proposed circuit is designed in a 0.35um CMOS process with a supply voltage of 3.3V and a operating frequency of 2MHz. The size of the designed chip including PADs is
Hysteretic Buck Converter with Thermister to Improve Output Ripple Voltage
Lee, Dong-Hun ; Yoon, Kwang-Sub ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 128~133
DOI : 10.7471/ikeee.2014.18.1.128
This paper suggest hysteretic buck converter using thermistor that can improve output ripple voltage according to temperature to improve. In case of high temperature where circuit is sensitive, it decides two comparable voltages high. And, in case of non-high temperature where circuit is stable, it decides two comparable voltages low, then it minimizes output ripple voltage. simulation result what is included in this paper describe that output ripple voltage is reduced more than 30mV by using suggested converter, and load regulation was 0.011mV/mA. Suggested circuit is suitable to power managing circuit that operate digital circuit requiring fast response and low power.
Fall detection of the elderly through floor vibrations
Kim, Dong-Wan ; Ryu, Jong-Hyun ; Beack, Seung-Hwa ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 134~139
DOI : 10.7471/ikeee.2014.18.1.134
According to survey, more than 57.2% of the fall which is the most frequent safety accident of the elders takes place at home. This research aims to verify the fall by measuring and analyzing the floor vibration. And the vibration sensor module was designed with piezo film sensor and operation amplifier. The vibration signals are converted to digital signals through the data acquisition device and vibration sensor module. And then modified the signals into frequency domain to obtain characteristic vibration data. The characteristic signals are verified by K-Nearest Neighbor verification, and experimental results shows the recognition rate 93.6%. Also the fall detection sensor module is useful for extract the meaningful data for fall detection. 10 persons are participated for this experiment.
The Integrated SCADA Data Gateway Platform based on SmartGrid
Song, Byung-Kwen ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 140~145
DOI : 10.7471/ikeee.2014.18.1.140
OPC UA(IEC62541) is a communication protocol for SG(Smart Grid) application platform. It was standardized by IEC TC57 group in December 2012. The IEC61850 has been used in Digital Substation Systems and Smart Distributed Systems. The DNP3.0 has been used for device`s data collection/control in Distributed Systems. The DLMS/COSEM has been used to control metering and collect information in the Smart Metering. The top-level SG management platform needs an independent middleware to manage transparently the Power Information Technology, including the IEC61850, DNP3.0, DLMS/COSEM. In this paper, we propose the SDG(Scada Data Gateway) platform. It manages Power Information Technology based Digital Substation Systems and Smart Distributed systems, Smart Metering through OPC UA.
Performance Analysis of Web Service Middleware based on SOAP/RESTFUL
Song, Byung-Kwen ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 146~151
DOI : 10.7471/ikeee.2014.18.1.146
The Smart Grid provide a lot of additional service between ICT(Information Communication Technology) and fusion service. The smart grid using various protocol need to use independent middleware system for exchanging information data. The application system of Smart Grid is exchanging information on the almost All-IP system. The current All-IP middleware system consist of SOAP and RESTful. This paper analysis SOAP and RESTful. This result make use of building Smart Grid System.
Low Temperature Fluidity Performance Evaluation of Composited Package Fuel Heater for Diesel Cars
Lee, Jeong-Hwa ; Park, Hyung-Won ; Lee, Woong-Su ; Lee, Young-Jea ; Lee, Bo-Hee ; Yoon, Dal-Hwan ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 152~158
DOI : 10.7471/ikeee.2014.18.1.152
It is very important to supply the diesel fuel from fuel tank to combustion chamber in case of cold start procedure. the paraffin hydrocarbons are easily solidified at low fuel temperature and it can be blocking the fuel supply to the high pressure fuel pump. In order to reduce the fuel crystallization (Waxing), it have been used to develop not only cold flow additives but also the proper mounting design of fuel filter. Block heater in the fuel filter assembly have been also contained to improve the cold start and prevent blocking the fuel supply in Common Rail Direct Injection System. we can obtain the fuel pressure drop and fuel flow rate, power consumption of fuel heater to have the cold flow evaluation test with the saperated and composited fuel heater at the low ambient temperature, Due to evaluating cold flow performance of two block heater, we knew that composited package fuel heater was the excellent cold flow performance compared to separated type and obtained the parameters of cold flow.
A Study on Micro-Converter of Photovoltaic System for Efficiency Progress
Chae, Young-Kee ; Lim, Jung-Yeol ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 159~164
DOI : 10.7471/ikeee.2014.18.1.159
This paper targets the development of micro-converter such as a power converter for photovoltaic module. In corresponding to the poor performance of centralized PV system under partial shading, the power converter for single PV module to maximize the energy harvest from PV module. The power converter is constantly tracking the maximum power point of photovoltaic system and increases energy output power. To minimize the quantity of devices and switchs, 320W solar micro-converter is developed using synchronous rectifier. From the basis of these results, through simulations and experiments were verified efficiency.
A Low-complexity Mixed QR Decomposition Architecture for MIMO Detector
Shin, Dongyeob ; Kim, Chulwoo ; Park, Jongsun ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 165~171
DOI : 10.7471/ikeee.2014.18.1.165
This paper presents a low complexity QR decomposition (QRD) architecture for MIMO detector. In the proposed approach, various CORDIC-based QRD algorithms are efficiently combined together to reduce the computational complexity of the QRD hardware. Based on the computational complexity analysis on various QRD algorithms, a low complexity approach is selected at each stage of QRD process. The proposed QRD architecture can be applied to any arbitrary dimension of channel matrix, and the complexity reduction grows with the increasing matrix dimension. Our QR decomposition hardware was implemented using Samsung
technology. The numerical results show that the proposed architecture achieves 47% increase in the QAR (QRD Rate/Gate count) with 28.1% power savings over the conventional Householder CORDIC-based architecture for the
Analog Front-End Design Techniques and Method for Saturation of Hemoglobin with Oxygen Sensor
Park, Sejin ; Lee, Hokyu ; Park, Jongsun ; Kim, Chulwoo ;
Journal of IKEEE, volume 18, issue 1, 2014, Pages 172~178
DOI : 10.7471/ikeee.2014.18.1.172
This paper describes the design technique and the method of analog front-end to measure the saturation of hemoglobin with oxygen sensor. To process the
value from the sensor, the current data from the sensor should be converted into voltage domain. Designed analog front-end usually converts the current data from the sensor into voltage domain data to pass it on analog-to-digital converter called ADC with a different level of gain characteristics. This circuit was fabricated in a
CMOS technology and has 4 level of gain properties. The occupied area is