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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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The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 64, Issue 12 - Dec 2015
Volume 64, Issue 11 - Nov 2015
Volume 64, Issue 10 - Oct 2015
Volume 64, Issue 9 - Sep 2015
Volume 64, Issue 8 - Aug 2015
Volume 64, Issue 7 - Jul 2015
Volume 64, Issue 6 - Jun 2015
Volume 64, Issue 5 - May 2015
Volume 64, Issue 4 - Apr 2015
Volume 64, Issue 3 - Mar 2015
Volume 64, Issue 2 - Feb 2015
Volume 64, Issue 1 - Jan 2015
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Design and Analysis of Load Shedding for the Electric Propulsion System
Kim, Kyung-Hwa ; Kim, Dae-Heon ; Lee, Seok-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 971~977
DOI : 10.5370/KIEE.2015.64.7.971
The electric propulsion system requires more reliability and safety than the conventional propulsion system because any sudden changes of electric system would bring tremendous effects on the ship's safety and propulsion. So it is very important to consider the potential transient effects. This paper discusses one of the worst electric accident. That is, one or two of generators are out of service in normal seagoing condition. And the appropriate measures are simulated in order to prevent the frequency decline that can bring the other generator's tripping. In addition, the relation between the transient effects and the major factors(inertia of generator/motors, governor's drooping characteristic and response speed) are also identified using the ETAP software.
A Study on the Frequency Bias Setting of the AGC based on Frequency Response in Korea
Kang, Bo-Ram ; Kwon, Han-Na ; Kook, Kyung-Soo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 978~983
DOI : 10.5370/KIEE.2015.64.7.978
This paper presents Frequency Bias setting for the adequate AGC(Automatic Generator Control) operation based on the frequency response of power system in Korea. AGC frequency control recovers the frequency up to 60Hz following a primary control when the frequency suddenly drops due to a fault in power system. AGC can compensate an appropriate amount of generation by calculating ACE(Are Control Error) from the frequency deviation with the AGC frequency bias set from the actual frequency response in power systems. An appropriateness of the proposed AGC bias setting is verified through case studies employing the simulation model.
Optimal Design of Power Grid and Location of Offshore Substation for Offshore Wind Power Plant
Moon, Won-Sik ; Won, Jong-Nam ; Huh, Jae-Sun ; Jo, Ara ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 984~991
DOI : 10.5370/KIEE.2015.64.7.984
This paper presents the methodology for optimal design of power grid for offshore wind power plant (OWPP) and optimum location of offshore substation. The proposed optimization process is based on a genetic algorithm, where the objective cost model is composed of investment, power loss, repair, and reliability cost using the net present value during the whole OWPP life cycle. A probability wind power output is modeled to reflect the characteristics of a wind power plant that produces electricity through wind and to calculate the reliability cost called expected energy not supplied. The main objective is to find the minimum cost for grid connection topology by submarine cables which cannot cross each other. Cable crossing was set as a constraint in the optimization algorithm of grid topology of the wind power plant. On the basis of this method, a case study is conducted to validate the model by simulating a 100-MW OWF.
Application of Energy Storage System for Industrial Customer
Hong, Jong-seok ; Chai, Hui-seok ; Kang, Byoung-wook ; Kim, Tae-hyeong ; Kim, Jae-chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 992~998
DOI : 10.5370/KIEE.2015.64.7.992
The ESS is composed of Battery Package, PCS(Power Conditioning System) Package, BCU(BESS Control Unit). In Jeju smart grid test-bed, we have developed a business model by ESS power system, renewable energy, transportation, such as customers, and have demonstrated above things. We have analyzed the EMS(Energy Management System) model of KPX where manages supply and demand of domestic electrical power system. We modified and launched EMS for microgrid but the cost was expensive and the system was large size. For releasing this system from industry as a whole, it is imperative to develop PMS(Power Management System) for microgrid. However, the cost of EMS for microgrid is expensive, some systems because it is a large development of the all of the first fruits in urgent PMS(Power Management System) for microgrid to be used in industry in general. Therefore, in this paper, we propose the ESS model considering the power systems characteristics and extensibility in korea. and also we propose the PMS to manage the ESS systems.
A Study on the Development of 34kW class Cryogenic Induction Motor using LNG Pump
Lee, Ki-Wook ; Jeong, Dong-Wook ; Park, Gwan-Soo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 999~1004
DOI : 10.5370/KIEE.2015.64.7.999
In this paper, the study presents the development of 34kW class cryogenic induction motor using LNG Pump. Operating temperature of an induction motor using LNG Main Cargo Pump is at −163℃. Due to variation of the resistivity, these motor have different torque characteristics. So, it should design to considering the resistivity change. The most important consideration of induction machine operating is cryogenic temperature. If the temperature rise, LNG is vaporized. it is a major cause of pump failure. There are several causes of heat source like coreloss, hysterisysloss, copperloss. This paper analyzed the thermal distribution of the induction motor at rated speed operation.
DC offset Compensation Algorithm with Fast Response to the Grid Voltage in Single-phase Grid-connected Inverter
Han, Dong Yeob ; Park, Jin-Hyuk ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1005~1011
DOI : 10.5370/KIEE.2015.64.7.1005
This paper proposes the DC offset compensation algorithm with fast response to the sensed grid voltage in the single-phase grid connected inverter. If the sensor of the grid voltage has problems, the DC offset of the grid voltage can be generated. This error must be resolved because the DC offset can generate the estimated grid frequency error of the phase-locked loop (PLL). In conventional algorithm to compensate the DC offset, the DC offset is estimated by integrating the synchronous reference frame d-axis voltage during one period of the grid voltage. The conventional algorithm has a drawback that is a slow dynamic response because monitoring the one period of the grid voltage is required. the proposed algorithm has fast dynamic response because the DC offset is consecutively estimated by transforming the d-axis voltage to synchronous reference frame without monitoring one cycle time of the grid voltage. The proposed algorithm is verified from PSIM simulation and the experiment.
The Performance Evaluation Analysis of PV System for Arch and Flat-Plate Type
Piao, Zheng-Guo ; Choi, Youn-Ok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1012~1018
DOI : 10.5370/KIEE.2015.64.7.1012
The studies on the operating performance analysis or design about the fixed tilt angle flat-plate photovoltaic (PV) system are still lively going off. However the operating property analysis about the arch type PV system which means PV array were designed as round type is dissatisfied. In this paper, we theoretically established the factors which are cause of the deterioration in performance of arch type PV system. In addition, we use the Solar Pro simulation tools to design both flat-plate type and arch type 30kW PV systems. The simulations about arch type PV system applied two ways such as central inverter and string inverter were conducted. The performance ratio (PR) of the PV system with flat-plate type shows the highest value 74[%] when the tilt angle is 30°. In case of arch type, when applying central inverter method, PR value shows approximately 73[%] and no more difference with arch type of the PV array. This value shows 1[%] decrease compare with the flat-plate type. However when applying string inverter methods, the average PR value shows 80 % and 6% improved than the central inverter method.
Prevention of the Malfunction of the ATS Signaling System by Parallel Operation with ATC
Jeong, Rag-Gyo ; Kim, Baek-Hyun ; Kang, Seok-Won ; Park, Geon-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1019~1025
DOI : 10.5370/KIEE.2015.64.7.1019
The performance requirements on the safety-based functionality of railway signal systems have been reinforced and the effort for enhancement of the existing system or development of the new system is being accordingly made. In particular, various technical researches on replacement or improvement of the existing ATS(Automatic Train Stop) signaling system are now in progress for better operational efficiency. In this study, the complementary points for improvement or replacement of the currently used system(i.e., ATS) will be derived in terms of operating efficiency in an integrated operating environment with the newly introduced system(e.g., ATC: Automatic Train Control). This study can contribute to derive the need for improvement of the signaling system by checking the interface problems and comparing between different systems through the analysis of real operation cases in the field. Eventually, this analysis can be applied to prevent and estimate the collision accidents can be caused by the failure of the signaling system in advance. In addition, the results can be used to provide a future direction to secure the reliability in the parallel operation by integration based on different railway signaling systems.
Implementation of the Simulator for Evaluating a Long-range Laser Range Finder and a Laser Target Designator
Lee, Young-Ju ; Kim, Yong-Pyung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1026~1030
DOI : 10.5370/KIEE.2015.64.7.1026
In this paper, we propose a signal processing board of an optical delay simulator for evaluating a long-range laser range finder and a laser target designator. We improved the accuracy by applying the clock multiplication and the correction of error gradient. To evaluate the performance of the proposed method, we implemented a prototype board and performed experiments. As a result, we implemented the optical delay simulator with resolution less than 0.7m in measuring distance 60km and a standard deviation of 0.041m. The PRF code detection logic and generation logic have a stability less than 0.03% and 0.08% compared to the NATO standard, respectively.
Heat Source Identification Technique of Aircraft and Flare using 2-color Detectable Infrared Sensors
Lee, Dong-Si ; Lee, Kee-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1031~1039
DOI : 10.5370/KIEE.2015.64.7.1031
Present guided missiles are equipped with infrared seeker to find the infrared sources radiating from target plane and then chase, which results in an improvement of the hitting success rate when in striking target objects. To interrupt the chases from the guided missile, the target plane spreads the flare, avoiding the missile attracts. Our research is to develop a 2-color infrared identification technique to discern the flare and real thermal source from target plane. Considering flare radiation properties and EM atmosphere transmission rates, two channels were selected, in which main channel (MC) was in a range of 3.7 μm∼4.8 μm and auxiliary channel (AC) in 1.7 μm∼2.3 μm. A 2500K heat source was used for an artificial flare source, while a 570K heat source was utilized for airplane infrared source in experimental testing. Two infrared sensors detectable only at each chanel were employed in order to measure the voltage ratio from two channels, identifying the flare and real target plane via comparison the voltage ratio. Several experimental conditions were imported in order to prove that our proposed 2-color infrared identification technique is very efficient way to discern heat sources from aircraft and flare, demonstrating that our proposed technique is very promising means for our force’s InfraRed Counter Counter Measure (IRCCM) in order to countermeasure opposite force’s InfraRed Counter Measures (IRCM).
Evolutionary Generation Based Color Detection Technique for Object Identification in Degraded Robot Vision
Kim, Kyoungtae ; Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1040~1046
DOI : 10.5370/KIEE.2015.64.7.1040
This paper introduces GP(Genetic Programming) based color detection model for an object detection of humanoid robot vision. Existing color detection methods have used linear/nonlinear transformation of RGB color-model. However, most of cases have difficulties to classify colors satisfactory because of interference of among color channels and susceptibility for illumination variation. Especially, they are outstanding in degraded images from robot vision. To solve these problems, we propose illumination robust and non-parametric multi-colors detection model using evolution of GP. The proposed method is compared to the existing color-models for various environments in robot vision for real humanoid Nao.
Detection using Optical Flow and EMD Algorithm and Tracking using Kalman Filter of Moving Objects
Lee, Jung Sik ; Joo, Yung Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1047~1055
DOI : 10.5370/KIEE.2015.64.7.1047
We proposes a method for improving the identification and tracking of the moving objects in intelligent video surveillance system. The proposed method consists of 3 parts: object detection, object recognition, and object tracking. First of all, we use a GMM(Gaussian Mixture Model) to eliminate the background, and extract the moving object. Next, we propose a labeling technique forrecognition of the moving object. and the method for identifying the recognized object by using the optical flow and EMD algorithm. Lastly, we proposes method to track the location of the identified moving object regions by using location information of moving objects and Kalman filter. Finally, we demonstrate the feasibility and applicability of the proposed algorithms through some experiments.
A Posture Based Control Interface for Quadrotor Aerial Video System Using Head-Mounted Display
Kim, Jaeseung ; Jeong, Jong Min ; Kim, Han Sol ; Hwang, Nam Eung ; Choi, Yoon Ho ; Park, Jin Bae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1056~1063
DOI : 10.5370/KIEE.2015.64.7.1056
In this paper, we develop an interface for aerial photograph platform which consists of a quadrotor and a gimbal using the human body and the head posture. As quadrotors have been widely adopted in many industries such as aerial photography, remote surveillance, and maintenance of infrastructures, the demand of aerial video and photograph has been increasing remarkably. Stick type remote controllers are widely used to control a quadrotor, but this method is not an intuitive way of controlling the aerial vehicle and the camera simultaneously. Therefore, a new interface which controls the serial photograph platform is presented. The presented interface uses the human head movement measured by head-mounted display as a reference for controlling the camera angle, and the human body posture measured from Kinect for controlling the attitude of the quadrotor. As the image captured by the camera is displayed on the head-mounted display simultaneously, the user can feel flying experience and intuitively control the quadrotor and the camera. Finally, the performance of the developed system shown to verify the effectiveness and superiority of the presented interface.
Design & Implementation of Pedestrian Detection System Using HOG-PCA Based pRBFNNs Pattern Classifier
Kim, Jin-Yul ; Park, Chan-Jun ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1064~1073
DOI : 10.5370/KIEE.2015.64.7.1064
In this study, we introduce the pedestrian detection system by using the feature of HOG-PCA and RBFNNs pattern classifier. HOG(Histogram of Oriented Gradient) feature is extracted from input image to identify and recognize a object. And a dimension is reduced for improving performance as well as processing speed by using PCA which is a typical dimensional reduction algorithm. So, the feature of HOG-PCA through the dimensional reduction by using PCA leads to the improvement of the detection rate. FCM clustering algorithm is used instead of gaussian function to apply the characteristic of input data as well and connection weight is used by polynomial expression such as constant, linear, quadratic and modified quadratic. Finally, INRIA person database known as one of the benchmark dataset used for pedestrian detection is applied for the performance evaluation of the proposed classifier. The experimental result of the proposed classifier are compared with those studied by Dalal.
Dynamic Model and P-PD Control based Flight Performance Evaluation for Hexa-Rotor Type UAV
Jin, Taeseok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1074~1080
DOI : 10.5370/KIEE.2015.64.7.1074
In the last decades, the increasing interest in unmanned aerial vehicle(UAV) for military, surveillance, and rescue applications made necessary the development of flight control theory and body structure more and more efficient and fast. In this paper, we describe the design and performance of a prototype hexarotor UAV platform featuring an inertial measurement unit(IMU) based autonomous-flying for use in bluetooth communication environments. The proposed system comprises the construction of the test hexarotor platform, the implementation of an IMU, dynamic modeling and simulation in the hexarotor helicopter. Furthermore, the hexarotor helicopter with implemented IMU is connected with a micro controller unit(ARM-cortex) board. The P-PD control algorithm was used to control the hexarotor. We used the Matlab software to help us to tune the P-PD control parameters for quick response and minimizing the fluctuation. The control simulation and experiment on the real system are implemented in the test platform, evaluated and compared against each other.
Collaborative Obstacle Avoidance Method of Surface and Aerial Drones based on Acoustic Information and Optical Image
Man, Dong-Woo ; Ki, Hyeon-Seung ; Kim, Hyun-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1081~1087
DOI : 10.5370/KIEE.2015.64.7.1081
Recently, the researches of aerial drones are actively executed in various areas, the researches of surface drones and underwater drones are also executed in marine areas. In case of surface drones, they essentially utilize acoustic information by the sonar and consequently have the local information in the obstacle avoidance as the sonar has the limitations due to the beam width and detection range. In order to overcome this, more global method that utilizes optical images by the camera is required. Related to this, the aerial drone with the camera is desirable as the obstacle detection of the surface drone with the camera is impossible in case of the existence of clutters. However, the dynamic-floating aerial drone is not desirable for the long-term operation as its power consumption is high. To solve this problem, a collaborative obstacle avoidance method based on the acoustic information by the sonar of the surface drone and the optical image by the camera of the static-floating aerial drone is proposed. To verify the performance of the proposed method, the collaborative obstacle avoidances of a MSD(Micro Surface Drone) with an OAS(Obstacle Avoidance Sonar) and a BMAD(Balloon-based Micro Aerial Drone) with a camera are executed. The test results show the possibility of real applications and the need for additional studies.
Design of Electric Power Load Forecasting Model based on IT2TSK FLS
Bang, Young-Keun ; Shim, Jae-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1088~1095
DOI : 10.5370/KIEE.2015.64.7.1088
In most cases, the use of electric power is associated with the economic scale of a nation closely. Thus, the electric power load forecasting plays an important role for the national economic plan. This paper deals with the design method for the electric power load forecasting system. In this paper, RCR-MA data processing, which can make the complex properties of the original data form simple, is proposed. Next, IT2TSK FLS, which can reflect the uncertainty of data more than T1TSK FLS, is applied. Consequently, the structural advantage of the proposed system can improve the forecasting accuracy, and is verified by using two types of electric power data.
Robust Control of Electromagnetic Levitation System with Uncertain Coil Resistor
Jeong, Min-Gil ; Choi, Ho-Lim ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1096~1103
DOI : 10.5370/KIEE.2015.64.7.1096
Electromagnetic levitation system(EMLS) is one of the well known nonlinear systems due to its high degree of nonlinearities. Moreover, when there are uncertain parameters in EMLS, it is not easy to have an accurate control of EMLS. In this paper, we first apply a standard input-output feedback linearzing controller to EMLS and investigate the possible control error caused by uncertain coil resistor. Then, as a remedy, we design and apply a robust controller using Lyapunov redesign technique to deal with this uncertain coil resistor in the system. The validity of our robust controller is verified via system analysis and experimental results.
Design of Two-Dimensional Robust Face Recognition System Realized with the Aid of Facial Symmetry with Illumination Variation
Kim, Jong-Bum ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1104~1113
DOI : 10.5370/KIEE.2015.64.7.1104
In this paper, we propose Two-Dimensional Robust Face Recognition System Realized with the Aid of Facial Symmetry with Illumination Variation. Preprocessing process is carried out to obtain mirror image which means new image rearranged by using difference between light and shade of right and left face based on a vertical axis of original face image. After image preprocessing, high dimensional image data is transformed to low-dimensional feature data through 2-directional and 2-dimensional Principal Component Analysis (2D)2PCA, which is one of dimensional reduction techniques. Polynomial-based Radial Basis Function Neural Network pattern classifier is used for face recognition. While FCM clustering is applied in the hidden layer, connection weights are defined as a linear polynomial function. In addition, the coefficients of linear function are learned through Weighted Least Square Estimation(WLSE). The Structural as well as parametric factors of the proposed classifier are optimized by using Particle Swarm Optimization(PSO). In the experiment, Yale B data is employed in order to confirm the advantage of the proposed methodology designed in the diverse illumination variation
Design of Precipitation/non-precipitation Pattern Classification System based on Neuro-fuzzy Algorithm using Meteorological Radar Data : Instance Classifier and Echo Classifier
Ko, Jun-Hyun ; Kim, Hyun-Ki ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1114~1124
DOI : 10.5370/KIEE.2015.64.7.1114
In this paper, precipitation / non-precipitation pattern classification of meteorological radar data is conducted by using neuro-fuzzy algorithm. Structure expression of meteorological radar data information is analyzed in order to effectively classify precipitation and non-precipitation. Also diverse input variables for designing pattern classifier could be considered by exploiting the quantitative as well as qualitative characteristic of meteorological radar data information and then each characteristic of input variables is analyzed. Preferred pattern classifier can be designed by essential input variables that give a decisive effect on output performance as well as model architecture. As the proposed model architecture, neuro-fuzzy algorithm is designed by using FCM-based radial basis function neural network(RBFNN). Two parts of classifiers such as instance classifier part and echo classifier part are designed and carried out serially in the entire system architecture. In the instance classifier part, the pattern classifier identifies between precipitation and non-precipitation data. In the echo classifier part, because precipitation data information identified by the instance classifier could partially involve non-precipitation data information, echo classifier is considered to classify between them. The performance of the proposed classifier is evaluated and analyzed when compared with existing QC method.
Mixed Integer Programming (MIP)-based Energy Storage System Scheduling Method for Reducing the Electricity Purchasing Cost in an Urban Railroad System
Ko, Rakkyung ; Kong, Seongbae ; Joo, Sung-Kwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1125~1129
DOI : 10.5370/KIEE.2015.64.7.1125
Increasing peak load is one of the major concerns about operation of urban railroad systems. Since ESSs (Energy Storage Systems) have a great potential for shaving the peak load, there has been a growing interest in the use of ESS for peak load reduction. Also, ESS can be optimally scheduled to minimize the electricity purchasing cost under a given ToU (Time-of-Use) tariff by taking advantage of electricity price difference between peak and off-peak time. This paper presents a Mixed Integer Programming (MIP)-based ESS scheduling method to minimize the electricity purchasing cost under a ToU tariff for an urban railroad system.
A Study on the Field Application of Switching Power Measurement by using Sensor in Electrical Point Machine
LEE, Jong-Hyun ; KIM, Yong-Kyu ; PARK, Jae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 7, 2015, Pages 1130~1136
DOI : 10.5370/KIEE.2015.64.7.1130
Most equipments which are used to measure the switching power of the turnout depend on imports. As the data is limited to the measurements of the switching power, it is said that the equipment is insufficient to check the errors of the turnout and the electrical point machine, and set up the data for operating and maintenance. We studied not only measurements of the switching power of all turnout being used in domestic but also the development of the turnout performance total analysis equipment which can measure switching time, voltage, and current etc. at the same time. Considering that switching power of the turnout is the most basic element to check the irregularities of the turnout, in this paper, we analyzed the irregularities of the turnout through correlation between switching power of the turnout, voltage, and current of the electrical point machine. Also we performed test in commercial railway line where the turnout of MJ81 type and NS type was installed. And it is said that the test results can be used as basic technologies for ICT based real-time diagnosis and monitoring of the turnout.