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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of The Korean Institute of Electrical Engineers
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 63, Issue 12 - Dec 2014
Volume 63, Issue 11 - Nov 2014
Volume 63, Issue 10 - Oct 2014
Volume 63, Issue 9 - Sep 2014
Volume 63, Issue 8 - Aug 2014
Volume 63, Issue 7 - Jul 2014
Volume 63, Issue 6 - Jun 2014
Volume 63, Issue 5 - May 2014
Volume 63, Issue 4 - Apr 2014
Volume 63, Issue 3 - Mar 2014
Volume 63, Issue 2 - Feb 2014
Volume 63, Issue 1 - Jan 2014
Selecting the target year
Initial Results of Low Frequency Oscillation Analysis based on Synchrophasor in KEPCO System
Shim, Kwan-Shik ; Kim, Sang-Tae ; Nam, Hae-Kon ; Choi, Joon-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 1~9
DOI : 10.5370/KIEE.2014.63.1.001
The parameters of electromechanical modes offer considerable insight into the dynamic stability properties of a power system. This paper describes an initial result for extraction of dynamic parameters from synchrophasor measurements collected on the KEPCO system. Dominant modes of the system are estimated by oscillation detecting program in K-WAMS. The critical wide-area modes of KEPCO system have frequencies in the 0.4 to 0.7Hz range. And the local mode causing the low frequency oscillation of generators located on the west coast area has in the frequency 0.97 and 1.25 Hz, respectively. This results can serve as a reference in the future for reliable system operation in KEPCO system.
The Effects of Penetration of the Electric Vehicles on the Electric Power Grid in the Jeju Island
Oh, Seong-Bo ; Lee, Gae-Myoung ; Hwang, Choong-Gu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 10~17
DOI : 10.5370/KIEE.2014.63.1.010
The Jeju Special Self-Government Provincial Government has made the plan penetrating gradually electric vehicles(EVs) in the Jeju Special Self-Government Province(Jejudo). However the effects of EVs penetration on the electrical grid of the Jejudo is not reported. In this paper the yearly electric energy consumed by the EVs was calculated and the effects of the EV penetration on the peak power of the grid were analyzed in the Jejudo for the future 10 years, and we hope that our study results will help the governors realize the EVs penetration plan in the Jejudo. The calculation results show that the rate of the electric energy used by the EVs will become to 2.9% at its maximum at the 2017 year when the penetration rate of EVs in passenger cars becomes 10%, and the rate of the electric energy consumed by the EVs will become to 9.4% at its maximum at the 2020 year when the penetration rate of EVs in passenger cars becomes 30%. The concepts of smart-charging capacity and 100%-valley-filling charging capacity of the grid were defined and calculated for the Jeju Grid, and the grid was analyzed to have the sufficient EV charging capacity until the 2022 year.
A Study on Optimal Operation of Microgrid Considering the Probabilistic Characteristics of Renewable Energy Generation and Emissions Trading Scheme
Kim, Ji-Hoon ; Lee, Byung Ha ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 18~26
DOI : 10.5370/KIEE.2014.63.1.018
A microgrid can play a significant role for enlargement of renewable energy sources and emission reduction because it is a network of small, distributed electrical power generators operated as a collective unit. In this paper, an application of optimization method to economical operation of a microgrid is studied. The microgrid to be studied here is composed of distributed generation system(DGS), battery systems and loads. The distributed generation systems include combined heat and power(CHP) and small generators such as diesel generators and the renewable energy generators such as photovoltaic(PV) systems, wind power systems. Both of thermal loads and electrical loads are included here as loads. Also the emissions trading scheme to be applied in near future, the cost of unit start-up and the operational characteristics of battery systems are considered as well as the probabilistic characteristics of the renewable energy generation and load. A mathematical equation for optimal operation of this system is modeled based on the mixed integer programming. It is shown that this optimization methodology can be effectively used for economical operation of a microgrid by the case studies.
Sizing and Economic Analysis of Battery Energy Storage System for Peak Shaving of High-Speed Railway Substations
Kim, Seul-Ki ; Kim, Jong-Yul ; Cho, Kyeong-Hee ; Byun, Gil-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 27~34
DOI : 10.5370/KIEE.2014.63.1.027
The paper proposed a sizing method of an energy storage system(ESS) for peak shaving of high-speed railway substations based on load profile patterns of substations. A lithium based battery ESS was selected since it can produce high-power at high speed that peak shaving requires, and also takes up a relatively smaller space for installation. Adequate size of the ESS, minimum capacity which can technically meet a peak shaving target, was determined by collectively considering load patterns of a target substation, characteristics of the ESS to be installed, and optimal scheduling of the ESS. In case study, a local substation was considered to demonstrate the proposed sizing method. Also economic analysis with the determined size of ESS was performed to calculate electricity cost savings of the peak shaving ESS, and to offer pay-back period and return on investment.
A Design of Programmable Low Pass Filter to Reduce the ZCP Estimation Error at High Speed BLDC Sensorless Drive
Seo, Eunjeong ; Lee, Kangseok ; Lee, Wootaik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 35~41
DOI : 10.5370/KIEE.2014.63.1.035
This paper presents a design method of programmable low pass filter(PLPF) which reduce an estimation error of a zero crossing point(ZCP) for a high speed brushless DC(BLDC) motor drive. BLDC motor sensorless drive is possible by estimation of ZCP. The ZCP estimated by detecting a change of back-EMF polarity has the estimation error because noises exist on the measured back-EMF. Therefore a calculated commutation timing using the ZCP is inaccurate. And the inexact commutation timing leads to ripples of 3-phase current and degradation of drive performance. This paper proposes the design method of the PLPF to overcome these problems. First, a speed calculated a inaccurate period of the ZCP is analyzed in the frequency domain. Then, the PLPF that has varying cut-off frequency according to change of the speed is designed on the frequency analysis result. The proposed method is verified by the experiment.
Thermal Analysis According to Duty Ratio of IPM Type BLDC Motor
Kim, Yong-Tae ; Cho, Gyu-Won ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 42~47
DOI : 10.5370/KIEE.2014.63.1.042
The use of BLDC motor in Vehicle and industrial field, it is operated by continuous and intermittent driving. When the intermittent driving is occurred by the rise and fall of temperature repeatedly, it was represented by different characteristics in case of continuous driving. So, it is very important that heat source estimation according to the duty ratio. In this paper, temperature characteristics according to the operating method of BLDCM was calculated by using the thermal equivalent circuit, and the validity of the study was demonstrated as compared to the calculated and experimental results.
The Rotor Barrier Design of the BLDC Motor Consider that Irreversible Demagnetization of Permanent Magnets
Kim, Cheol-Min ; Cho, Gyu-Won ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 48~53
DOI : 10.5370/KIEE.2014.63.1.048
Generally, the usage motor in the vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping during very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering starting current of Brushless DC Motor (BLDCM) through Finite Element Method(FEM). As a result, the end of Permanent Magnet (PM) in the basic model was occurring a partial irreversible demagnetization by starting current. To solve this problem, the installing flux barrier was limited to flux line on the core. Accordingly, demagnetization endurance and operating characteristics were improved.
Design and Characteristics Analysis on Linear Synchronous Motor with Long Stator and Phase Concentrated Winding
Kim, Jeong-Man ; Cho, Han-Wook ; Jang, Seok-Myeong ; Jo, Jeong-Min ; Han, Young-Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 54~62
DOI : 10.5370/KIEE.2014.63.1.054
This study deals with the design and characteristics analysis on a linear synchronous motor (LSM) with a long stator and phase concentrated winding (PCW) to apply for a propulsion system such as a roller coaster for leisure facilities. First of all, the required propulsion force of LSM is computed and its design with double sided permanent magnets (PMs) and a phase concentrated winding is processed. The phase concentrated winding is composed of a module with each A, B, and C phase unlike an conventional concentrated winding (CW). It has an advantage of the installation and manufacture, compared to the conventional concentrated winding in the propulsion system for leisure facilities that have a long acceleration area and stator configuration placed on rail continuously. Thus, the design for the propulsion system and characteristics comparison between the phase concentrated winding and concentrated winding are carried out in this paper. Also, the analysis on dynamic characteristics is conducted to confirm the performance at operation.
A Specialized Reader for High Speed UHF RFID Tag Inlay Inspection Equipment
Bae, Sung Woo ; Park, Jun-Seok ; Seong, Yeong Rak ; Oh, Ha-Ryoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 63~69
DOI : 10.5370/KIEE.2014.63.1.063
RFIDs have not become widespread as expected partly due to the cost, size, read range, and reliability problems of tags. The success rate of reading must be improved in order for RFIDs to be widely adopted. Quality control of tags is crucial to meet this requirement. In this study, we designed and implemented a high-performance reader used in inspection equipment that conducts prior inspection of tags. To improve performance of the developed reader, the baseband modem and command processor (CP) were designed using H/W logic and implemented with FPGA. The inspection of small pitch inlays was made possible through the antenna shielding device and H/W command processor function. This equipment enables accurate evaluation of performance and identification of tags satisfying a given read range. By contributing to sort out defective tags, the results can ultimately lead to more stable RFID services.
Development of the Triple Modular Redundant Excitation System with Simulator for 500MW Synchronous Generator
Ryu, Hoseon ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 70~75
DOI : 10.5370/KIEE.2014.63.1.070
TMR(triple modular redundant) digital excitation system with simulator is developed for tuning optimal control parameters during commissioning test and coping with system faults rapidly. A new system which mocks up virtual generator, turbine, grid can simulate as if excitation system is connected to a real generator system by setting four switches. The maintenance crew using the simulator is able to test perfectly the phase controller rectifiers, field breaker, sequence relays as well as TMR controller of the excitation system. Commissioning and performance results about the excitation system with simulator is discussed. The trial product was installed and operated at a 500MW thermal power plant after the commissioning test.
Fabrication of ZnO Nanorod-based Electrochemical Luminescence Cells and Fundamental Luminescence Properties
Oh, Hyung-Suk ; Sung, Youl-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 76~79
DOI : 10.5370/KIEE.2014.63.1.076
We report Zinc oxide (ZnO) nanorods synthesis and electrochemical luminescence (ECL) cell fabrication. The ECL cell was fabricated using the electrode of ZnO nanorods and Ru(II) complex (
) as a luminescence materials. The fabricated ECL cell is composed of F-doped
(FTO) glass/ Ru(II)/ZnO nanorods/FTO glass. The highest intensity of the emitting light was obtained at the wavelength of ~620 nm which corresponds to dark-orange color. At a bias voltage of 3V, the measured ECL efficiencies were 5
for cell without ZnO nanorod, 145
for ZnO nanorods-
for ZnO nanorods-
for ZnO nanorods-
, respectively. At a bias voltage of 3.5V, the use of ZnO nanorods increases ECL intensities by about 3 times compared to the typical ECL cell without the use of ZnO nanorods.
Fabrication of Atmospheric Coplanar Dielectric Barrier Discharge and Analysis of its Driving Characteristics
Lee, Ki-Yung ; Kim, Dong-Hyun ; Lee, Ho-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 80~84
DOI : 10.5370/KIEE.2014.63.1.080
The discharge characteristics of Surface Dielectric Barrier Discharge (SDBD) reactor are investigated to find optimal driving condition with adjusting various parameter. When the high voltage with sine wave form is applied to SDBD source, successive pulsed current waveforms are observed owing to multiple ignitions through the long discharge channel and wall charge accumulation on the dielectric surface. The discharge voltage, total charge between dielectrics, mean energy and power are calculated from measured current and voltage according to electrode gap and dielectric thickness. Discharge mode transition from filamentary to diffusive glow is observed for narrow gap and high applied voltage case. However, when the diffusive discharge is occurred with high applied voltage, the actual firing voltage is always lower than that with low driving voltage. The
are considered for dielectric protection and high secondary electron emission coefficient. SDBD with
shows the lowest breakdown voltage.
thin film is proposed as a protection layer for low voltage atmospheric dielectric barrier discharge devices.
A Low Power UHF RFID Baseband Processor for Mobile Readers
Bae, Sung Woo ; Park, Jun-Seok ; Seong, Yeong Rak ; Oh, Ha-Ryoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 85~91
DOI : 10.5370/KIEE.2014.63.1.085
As RFID is utilized more frequently and diversely in terms of its application areas, the application of mobile RFID technology, which integrates cellular networks and RFID, is highly anticipated. The growth and development of the RFID field has bolstered the development of mobile RFID chips to be embedded in mobile phones. Because mobile RFID chips are embedded in cell phones, limitations such as low power, small form factor, and costliness must be confronted. This study presents the design of a RFID digital baseband processor that is suitable for mobile readers. The RF analog component, which affects the baseband signals, is designed separately, in consideration of the limitations stated above. The function of the baseband processor was verified through simulations and prototyped using FPGA. The power consumption of the chip is 20mW under a 20MHz clock and the chip measures
Path Planning Based on Spline D
Ryu, Hee-Rack ; Choi, Yun-Won ; Saitov-Sinl, Dilshat ; Lee, Suk-Gyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 92~98
DOI : 10.5370/KIEE.2014.63.1.092
This paper proposes a hermite spline based D* algorithm for effective path planning of mobile robot to improve the detecting speed. In conventional path planning research, a robot is supposed to pass through predetermined centers of grid partitions of area. However it doesn`t guarantee the optimal path during its navigation. In addition, a robot is hard to avoid obstacles effectively. The proposed algorithm in this paper makes use of stochastic characteristics of nonholonomic mobile robot and estimation of shortest path to curvature movement of the robot. The performance evaluation of the improved spline D* algorithm performed through simulation shows its effectiveness. Moreover, the experiment verifies that a robot can find the shortest path by building the curve paths while it is moving on the path in spline.
A Landmark Based Localization System using a Kinect Sensor
Park, Kwiwoo ; Chae, JeongGeun ; Moon, Sang-Ho ; Park, Chansik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 99~107
DOI : 10.5370/KIEE.2014.63.1.099
In this paper, a landmark based localization system using a Kinect sensor is proposed and evaluated with the implemented system for precise and autonomous navigation of low cost robots. The proposed localization method finds the positions of landmark on the image plane and the depth value using color and depth images. The coordinates transforms are defined using the depth value. Using coordinate transformation, the position in the image plane is transformed to the position in the body frame. The ranges between the landmarks and the Kinect sensor are the norm of the landmark positions in body frame. The Kinect sensor position is computed using the tri-lateral whose inputs are the ranges and the known landmark positions. In addition, a new matching method using the pin hole model is proposed to reduce the mismatch between depth and color images. Furthermore, a height error compensation method using the relationship between the body frame and real world coordinates is proposed to reduce the effect of wrong leveling. The error analysis are also given to find out the effect of focal length, principal point and depth value to the range. The experiments using 2D bar code with the implemented system show that the position with less than 3cm error is obtained in enclosed space(
Autonomous Navigation for a Mobile Robot Using Navigation Guidance Direction and Fuzzy Control
Park, Ji-Gwan ; Shin, Jin-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 108~114
DOI : 10.5370/KIEE.2014.63.1.108
This paper proposes a generation method of a navigation guidance direction and a fuzzy controller to achieve the autonomous navigation of a mobile robot using a particle swarm optimization(PSO) scheme in unknown environments. The proposed navigation guidance direction is the direction that leads a mobile robot to arrive a target point simultaneously with avoiding obstacles efficiently according to the surrounding local informations. It is generated by selecting the most suitable direction of the many directions in the surrounding environment using a particle swarm optimization scheme. Also, a robot can reach a target point with avoiding the various obstacles by controlling the robot so that it can move from its current orientation to the navigation guidance direction using the proposed fuzzy controller. Simulation results are presented to show the feasibility and validity of the proposed robot navigation scheme.
Real-time Hybrid Path Planning Algorithm for Mobile Robot
Lee, Donghun ; Kim, Dongsik ; Yi, Jong-Ho ; Kim, Dong W. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 115~122
DOI : 10.5370/KIEE.2014.63.1.115
Mobile robot has been studied for long time due to its simple structure and easy modeling. Regarding path planning of the mobile robot, we suggest real-time hybrid path planning algorithm which is the combination of optimal path planning and real-time path planning in this paper. Real-time hybrid path planning algorithm modifies, finds best route, and saves calculating time. It firstly plan the route with real-time path planning then robot starts to move according to the planned route. While robot is moving, update the route as the best outcome which found by optimal path planning algorithm. Verifying the performance of the proposed method through the comparing real-time hybrid path planning with optimal path planning will be done.
INS/vision Integrated Navigation System in Environments with Insufficient Number of Landmarks
Kim, Youngsun ; Hwang, Dong-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 123~131
DOI : 10.5370/KIEE.2014.63.1.123
An INS/vision integrated navigation algorithm is proposed for environments with insufficient number of landmarks. In the proposed algorithm, the raw measurements on the focal plane are directly used in order to cope with the situation where the number of landmarks are not sufficient. In addition to this, the combination of landmarks, which has smallest value of DOP, is used in the update of measurement in order to improve navigation performance. In order to evaluate the performance of the proposed integrated navigation system, Monte-Carlo simulation and van test was performed. The results of the simulation and experiment show that the proposed navigation system gives better navigation performance than an INS/vision integrated navigation system which does not use the raw measurements on the focal plane and the navigation system provides navigation solutions even in environments with insufficient number of landmarks.
A Method for Reducing Path Tracking Errors of an AGV with a Trailer
Lee, Ji Young ; Sung, Young Whee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 132~138
DOI : 10.5370/KIEE.2014.63.1.132
The use of AGVs(Automated Guided Vehicles) are increasing in many factories. The most widely used AGV system is that magnetic tapes are attached on the factory floor to make guided path and an AGV equipped with a magnetic sensor follows the path by sensing magnetic flux. In this AGV system, usually a magnetic sensor is attached on the front end of an AGV to detect the guided path and the sensor generates analog voltages proportional to the magnetic flux. The problem is that the AGV in use has rather big tracking errors because the accurate orientation of the AGV can not be detected by using only one magnetic sensor. In this paper, we propose a method to minimize the path tracking errors. In our method, one additional sensor is attached on the rear end of the AGV to estimate the orientation of the AGV and to control more accurately the AGV according to the estimated orientation of the AGV. We performed several experiments and the results successfully show the feasibility of the proposed method.
Implementation and Balancing Control of A Single-wheel Mobile Robot Using Air Power
Sim, Yong-Gi ; Jung, Seul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 139~144
DOI : 10.5370/KIEE.2014.63.1.139
This paper presents the novel design, implementation and control of a single-wheel mobile robot that can balance by using air power from ducted fans. All of the motions of the single-wheel mobile robot are actuated by air power instead of motor torques. Using air power allows to reduce the total weight of the robot. The complementary sensor fusion algorithm is introduced to estimate the angle correctly. After several design and development, the robot is tested for balancing in the roll direction and yawing motion. In addition, the balancing control of the robot on a single rope is tested to evaluate the control performance.
The Geometric Modeling for 3D Information of X-ray Inspection
Hwang, Young-Gwan ; Lee, Seung-Min ; Park, Jong-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 145~149
DOI : 10.5370/KIEE.2014.63.1.145
In this study, using X-ray cargo container scanning device and to differentiate the concept of three-dimensional information extraction applied for X-ray scanning device as an ingredient in the rotation of the X-Ray Linear Pushbroom Stereo System by introducing the geometric How to model was introduced. Three-dimensional information obtained through the matching of a single voxel space filled with a random vector operations for each voxel in the three dimensional shape reconstruction algorithm using the definition, and in time, the time required for each step were analyzed. Using OpenCV in each step by applying parallelization techniques approximately 1.8 times improvement in the processing time of the check, but do not meet the target within one minute levels. The other hand, X-ray images by the primary process to convert the point View the results of real-time stereo through a three-dimensional could feel the comfort level.
Modeling an Information Architecture for Content Reuse in Engineering Accreditation Manuals
Koo, Heung-Seo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 150~155
DOI : 10.5370/KIEE.2014.63.1.150
Content is often developed inconsistently in technical authoring environments, as new documents are created and existing documents are revised. The Darwin Information Typing Architecture(DITA) is an XML-based, end-to-end architecture for authoring, producing, and delivering technical documentations. The core of most advanced authoring and publishing systems is the concept of content reuse. In this paper, we describe to design and implement an authoring and producing system of different technical documentations for the accreditation programs of Engineering Education using DITA XML. It provide a content reuse method for accomplishing the improvement of content consistency and the speed-up of the production in technical documentations.
Implementation of a Tone Correction System Through a Visualization of Melody Comparison
Lee, Hye-In ; Park, Ju-Hyun ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 156~161
DOI : 10.5370/KIEE.2014.63.1.156
With the proliferation of digital music, public`s interest in music and desire to sing well are increasing. This paper presents the implementation of a tone correction system through a visualization of comparison between music and humming data. For this we extract MIDI note from music and humming data and then design a matching engine using DTW algorithm which is for robust matching results against local timing variation and inaccurate tempo. This system is expected to correct the user`s wrong tone by visualization and feedback from the result.
Three-Dimensional Dynamic Model of Full Vehicle
Min, Kyung-Deuk ; Kim, Young Chol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 162~172
DOI : 10.5370/KIEE.2014.63.1.162
A three-dimensional dynamic model for simulating various motions of full vehicle is presented. The model has 16 independent degrees of freedom (DOF) consisting of three kinds of components; a vehicle body of 6 DOF, 4 independent suspensions equipped at every corner of the body, and 4 tire models linked with each suspension. The dynamic equations are represented in six coordinate frames such as world fixed coordinate, vehicle fixed coordinate, and four wheel fixed coordinate frames. Then these lead to the approximated prediction model of vehicle posture. Both lateral and longitudinal dynamics can be computed simultaneously under the conditions of which various inputs including steering command, driving torque, gravity, rolling resistance of tire, aerodynamic resistance, etc. are considered. It is shown through simulations that the proposed 3D model can be useful for precise design and performance analysis of any full vehicle control systems.
Color Image Segmentations of a Vitiligo Skin Image with Android Platform Smartphone
Park, Sang-Eun ; Kim, Hyun-Tae ; Kim, Jeong-Hwan ; Kim, Kyeong-Seop ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 173~178
DOI : 10.5370/KIEE.2014.63.1.173
In this study, the new color image processing algorithms with an android-based mobile device are developed to detect the abnormal color densities in a skin image and interpret them as the vitiligo lesions. Our proposed method is firstly based on transforming RGB data into HSI domain and segmenting the imag into the vitiligo-skin candidates by applying Otsu`s threshold algorithm. The structure elements for morphological image processing are suggested to delete the spurious regions in vitiligo regions and the image blob labeling algorithm is applied to compare RGB color densities of the abnormal skin region with them of a region of interest. Our suggested color image processing algorithms are implemented with an android-platform smartphone and thus a mobile device can be utilized to diagnose or monitor the patient`s skin conditions under the environments of pervasive healthcare services.
RFI Noise Reduction of the Electric Train in the Frequency Range of 9 kHz to 150 kHz
Kang, Yong-Sam ; Lee, Jongwoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 179~183
DOI : 10.5370/KIEE.2014.63.1.179
An electric railway is unique system that electric trains consumed huge electric power are travelled and is much interested with EMC. There were several problems exceeding the standard in the frequency range of 9 kHz to 150 kHz because the radiation noises were moved the higher frequency range according to developing the power electronic technology. It is studied the analytic simulation for reducing noise level in terms of cables of the electric train and is experimentally approved the reduction effectiveness.
The Feasibility Study on Small-scale Prototype Electric Railway Vehicle Application using Fuel Cell Generation System
Jung, No-Geon ; Chang, Chin-Young ; Chang, Sang-Hoon ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 184~190
DOI : 10.5370/KIEE.2014.63.1.184
Fuel cell power system, unlike conventional energy sources, converts chemical energy into electrical energy through electrochemical reaction of hydrogen and oxygen. In recent years, railway field as well as mobile fuel cell power system is being studying actively with development of hydrogen storage technologies. This paper presents the feasibility study on small-scale prototype electric railway vehicle application using fuel cell generation system. it is confirmed that proposed fuelcell-battery hybrid system shows good response characteristic about speed and torque based on design of parameter on system. Also as results of response for proposed system modeling, it show that powering mode and braking mode of system is controlled by switching devices of converters.
Study for Power Management System using Regenerative Energy in Electric Railway Systems
Lee, Hansang ; Cho, Yoonsung ; Kim, Hyungchul ; Jung, Hosung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 1, 2014, Pages 191~196
DOI : 10.5370/KIEE.2014.63.1.191
For the large scale of electricity consumer, since the price for the electricity consumption depends on the peak power, the issue for peak power reduction have been being studied widely. Electric railway systems, which is one of the most representative large scale of loads, also has assignment to reduce the peak power since they have high peak power and low energy consumption load characteristics. In the aspect of the economic operation through reduction of peak power, this paper proposes a novel algorithm for power management system in electric railway systems using energy storage.