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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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Development of Aging Diagnosis Algorithm for Photovoltaic Modules by Considering Electric Characteristics and Environment Factors
Lee, Kye-Ho ; Choi, Sung-Sik ; Kim, Byung-Ki ; Jung, Jong-Yun ; Kim, Chan-Hyeok ; Rho, Dae-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1411~1417
DOI : 10.5370/KIEE.2015.64.10.1411
The installation of PV system to the power distribution system is being increased as one of solutions for environmental pollution and energy crisis. However, the efficiency of PV system is getting decreased because of the aging phenomenon and several operation obstacles. Therefore, The technology development of aging diagnosis of PV modules are required in order to improve operation performance of PV modules. This paper proposes evaluation algorithm for aging state in PV modules by using the electrical characteristics of PV modules and environmental factors. And also, this paper presents a operation evaluation system of PV modules based on the proposed aging diagnosis algorithm of PV modules. From the simulation results of proposed evaluation system, it is confirmed that the proposed algorithm is a useful tool for aging diagnosis of PV systems.
An Improved Method of Fault Indication Information Using Filtering Algorithm
Seo, Jung-Soo ; Kim, Hyung-Seung ; Lim, Sung-Il ; Choi, Myeon-Song ; Lee, Seung-Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1418~1425
DOI : 10.5370/KIEE.2015.64.10.1418
In this paper, an filtering method of FI(Fault Indication) information generated by FRTU(Feeder Remote Terminal Unit)s is proposed for the present DAS(Distribution Automation System). In order to find fault area, correct FI information should be generated. But when a single line-to-ground fault occurs, FI information is generated in downside of the fault in some circumstance because existing FI algorithm considers only magnitude. These wrong FI information can be removed by changing existing algorithm. An improved algorithm considers both the direction of zero-sequence current and the phase of three-phase current&voltage. But many FRTUs are distributed in DAS and Changing the algorithm all of FRTU will spend a lot of time and cost. On the other hand, an filtering algorithm proposed in this paper can substitute for it. The filtering algorithm also considers both the direction of zero-sequence current and the phase of three-phase current&voltage. In case study, the proposed method has been shown the reasonability in filtering the fault indication information.
A Study on High Performance Operation of Hybrid Energy Recovery Drive System for Piezoelectric Pump
Hong, Sun-Ki ; Lee, Jung-Seop ; Cho, Yong-Ho ; Kim, Ki-Seok ; Kang, Tae-Sam ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1426~1431
DOI : 10.5370/KIEE.2015.64.10.1426
Piezoelectric pump can be considered as R-C load and it needs something special driver because the output voltage does not become 0 even though the applied voltage is 0 with common converter. This operating system consists of fly-back converter to increase the input voltage and energy recovery inverter to apply square voltage to the piezoelectric pump. The energy recovery inverter can charge and discharge the energy of capacitive load. In this paper, to enhance performance of the driver, a few elements or circuits are added and modified. To drive the inverter safely, current limit resister is added and adjusted the value to valance the charging and discharging current. In addition, a current limit inductor is added to the input side to limit the input current and enhance the efficiency. Inductor only may make oscillation and another resister is added parallel to the inductor to solve this problem. The converter and inveter are assembled to one board for compactness. The appropriateness is proved with simulation and experiments.
A Design of Solar Array Regulator for LEO Satellites
Park, Heesung ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1432~1439
DOI : 10.5370/KIEE.2015.64.10.1432
The solar array regulator supplies the electric power to the battery and the other units of a satellite by controlling the operating point of a solar array. In this paper, the solar array regulator composed with analog circuits is proposed. The solar array regulator has three modes. The first is a maximum power point tracking mode for harvesting the maximum photovoltaic power generation. The second is a power limitation mode which is designed for optimizing the volume and weight of the solar array regulator by preventing the excessive power conversion. The last constant voltage mode is proposed to keep the Li-Ion battery is not over-charge. The small signal model of the solar array regulator which has the reversed input and output variables in comparison with conventional converter is established and the stability is analysed. Finally, the proposed design of the solar array regulator is verified by experiments.
Design and Analysis of MEMS Vibrating Ring Gyroscope Considering High-g shock reliability
Yoon, Sung-Jin ; Park, U-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1440~1447
DOI : 10.5370/KIEE.2015.64.10.1440
This paper describes a study for anti high-shock design of MEMS vibrating ring gyroscope. Structure models was made by MEMS technology processing. MEMS Vibrating Ring Gyroscope mechanical structure were not only anti-high shock simulated with the LS Dyna Ver 971 software but also with mathematical analysis and the finite element method in order to confirm the shock reliability. Shock test result of a MEMS vibrating gyroscope being developed to have gun-hardened survivability while maintaining tactical grade navigation performance for application to various guided projectiles.
Reliability Improvement of In-Vehicle Networks by Using Wireless Communication Network and Application to ESC Systems
Lee, Jeong Deok ; Lee, Kyung-Jung ; Ahn, Hyun-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1448~1453
DOI : 10.5370/KIEE.2015.64.10.1448
In this paper, we propose an alternative method of communication to improve the reliability of in-vehicle networks by jointly using wireless communication networks. Wired Communication networks have been used in vehicles for the monitoring and the control of vehicle motion, however, the disconnection of wires or hardware fault of networks may cause a critical problem in vehicles. If the network manager detects a disconnection or faults in wired in-vehicle network like the Controller Area Network(CAN), it can redirect the communication path from the wired to the wireless communication like the Zigbee network. To show the validity and the effectiveness of the proposed in-vehicle network architecture, we implement the Electronic Stability Control(ESC) system as ECU-In-the-Loop Simulation(EILS) and verify that the control performance can be kept well even if some hardware faults like disconnection of wires occur.
Drug Treatment Protocol for HIV Infected Patients Using State Feedback Integral Control Technique
Jo, Nam-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1454~1459
DOI : 10.5370/KIEE.2015.64.10.1454
In this paper, a drug treatment protocol is proposed for an HIV infection model that explicitly includes the concentration of healthy T cells, infected T cells, and HIV. Since real parameters of HIV infection model differ from patient to patient, most drug treatment protocols are not able to achieve the treatment goal in the presence of modelling errors. Recently, based on the nonlinear robust control theory, a robust treatment protocol has been proposed that deals with parameter uncertainties. Although the developed scheme is inherently complex, it cannot be applied to the case where all parameters are unknown. In this paper, we propose a new drug treatment protocol that is much simpler than the previous one but can achieve the treatment goal even when all model parameters are unknown. The simulation results verify that the substantial improvement in the performance can be achieved by the proposed scheme.
Design of the High Throughput Pipeline LEA
Lee, Chul ; Park, Neungsoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1460~1468
DOI : 10.5370/KIEE.2015.64.10.1460
As the number of IoT service increases, the interest of lightweight block cipher algorithm, which consists of simple operations with low-power and high speed, is growing. LEA(Leightweight Encryption Algorithm) is recently adopted as one of lightweight encryption standards in Korea. In this paper a pipeline LEA architecture is proposed to process large amounts of data with high throughput. The proposed pipeline LEA can communicate with external modules in the 32-bit I/O interface. It consists of input, output and encryption pipeline stages which take 4 cycles using a muti-cycle pipeline technique. The experimental results showed that the proposed pipeline LEA achieved more than 7.5 Gbps even though the key length was varied. Compared with the previous high speed LEA in accordance with key length of 128, 192, and 256 bits, the throughput of the pipeline LEA was improved 6.45, 7.52, and 8.6 times. Also the throughput per area was improved 2, 1.82, and 2.1 times better than the previous one.
Design of Type-2 Radial Basis Function Neural Networks Modeling for Sewage Treatment Process
Lee, Seung-Cheol ; Kwun, Hak-Joo ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1469~1478
DOI : 10.5370/KIEE.2015.64.10.1469
In this paper, The methodology of Type-2 fuzzy set-based Radial Basis Function Neural Network(T2RBFNN) is proposed for Sewage Treatment Process and the simulator is developed for application to the real-world sewage treatment plant by using the proposed model. The proposed model has robust characteristic than conventional RBFNN. architecture of network consist of three layers such as input layer, hidden layer and output layer of RBFNN, and Type-2 fuzzy set is applied to receptive field in contrast with conventional radial basis function. In addition, the connection weights of the proposed model are defined as linear polynomial function, and then are learned through Back-Propagation(BP). Type reduction is carried out by using Karnik and Mendel(KM) algorithm between hidden layer and output layer. Sewage treatment data obtained from real-world sewage treatment plant is employed to evaluate performance of the proposed model, and their results are analyzed as well as compared with those of conventional RBFNN.
Local Path Planning for Mobile Robot Using Artificial Neural Network - Potential Field Algorithm
Park, Jong-Hun ; Huh, Uk-Youl ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1479~1485
DOI : 10.5370/KIEE.2015.64.10.1479
Robot's technology was very simple and repetitive in the past. Nowadays, robots are required to perform intelligent operation. So, path planning has been studied extensively to create a path from start position to the goal position. In this paper, potential field algorithm was used for path planning in dynamic environments. It is used for a path plan of mobile robot because it is elegant mathematical analysis and simplicity. However, there are some problems. The problems are collision risk, avoidance path, time attrition. In order to resolve path problems, we amalgamated potential field algorithm with the artificial neural network system. The input of the neural network system is set using relative velocity and location between the robot and the obstacle. The output of the neural network system is used for the weighting factor of the repulsive potential function. The potential field algorithm problem of mobile robot's path planning can be improved by using artificial neural network system. The suggested algorithm was verified by simulations in various dynamic environments.
A Study on the Characteristics Analysis According to the Permanent Magnet Segmentation Change to IPMSM for Urban Railway Vehicle
Jeong, Geochul ; Park, Chan-Bae ; Jeong, Taechul ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1486~1492
DOI : 10.5370/KIEE.2015.64.10.1486
The following study carried out the characteristic analysis based on the magnet segment of Interior Permanent Magnet Synchronous Motor(IPMSM) for the urban railway vehicles. IPMSM affects the electromagnetic characteristics through the change in magnetic flux based on the rotor structure, and significantly influences the structural features through the change of pressure. Therefore, satisfied by the demanded traction force of the IPMSM, magnet segment derived three different model types. The 1-segment PM model consisted an undivided permanent magnet. The 2-Bridge model consisted a divided permanent magnet with the application of Bridge. The 3-Bridge model consisted additional dividing with one more Bridge applied. The electromagnetic characteristics of the three models were compared and analyzed along with the structural features regarding the scattering of permanent magnet based on strong centrifugal force from the rotation of the rotor at high speed. In conclusion, the final model with electromagnetic characteristics and structural features most suitable of IPMSM for the urban railway vehicles was derived, and the effectiveness was verified through the characteristic experiments after the production of the derived model.
A Study on a Tram Signal Priority Strategy for Commercialization of the On-Board Oriented Train Control System
Baek, Jong-Hyen ; Sung, Yu-Suk ; Kim, Gonyop ; Choi, Hyeon Yeong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1493~1500
DOI : 10.5370/KIEE.2015.64.10.1493
For efficient and economical train operation in low-density railway line, on-board oriented train control system, which reduces expensive wayside equipment, is being developed. In this paper, we discuss a tram signal priority strategy which enables efficient and safe train operation when the developing system is applied to train-tram railway environment. Based on the well-known transit signal priority strategies, we develop a tram signal priority algorithm and conduct simulations by using model-based systems engineering (MBSE) tool. Various considerations such as operation procedure, linkage to existing road traffic system, applicability with respect to crossroad types, and so on, are also dealt with.
Analysis of the Contact Wire Wear Pattern According to the Pre-sag
Lee, In-Hee ; Park, Jae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1501~1507
DOI : 10.5370/KIEE.2015.64.10.1501
The contact wire pre-sag in railway overhead catenary has been considered as a innovative idea which improves the current collection quality and is expected to evenly distribute wear along a span. However, long term studies on the effects of pre-sag, especially on the quantitative wear pattern of the contact wire, have not yet been reported. Therefore, in this study, the pre-sag and wear pattern of the contact wire along a span from long term operation of railway in Korea was surveyed. The examination was conducted on 3 lines, the Gyeongbu high-speed line with pre-sag of span/2000, the Gyeongbu existing line without pre-sag, and Gyeongchun line with pre-sag installation on 1/1000 of its span. The wear measurements of 58 sample spans were examined. The wear pattern analysis show no interrelationships between pre-sag and evenly distributed wear, but more wear occurred at the center of a span compared to the ends of the span, especially more noticeable as span length increases.
Study on the Optimal Operation of ESS Considering Urban Railway Load Characteristic
Heo, Jae-Haeng ; Shin, Seungkwon ; Park, Jong-young ; Kim, Hyeongig ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1508~1516
DOI : 10.5370/KIEE.2015.64.10.1508
This paper proposes the optimal operation of ESS (Energy Storage System) in the substation of urban railway in an economical point of view. Since the load patterns of urban railway have different characteristics with the general power demand pattern, the characteristics motivate us to develop the optimal operation algorithm for ESS under Korean electricity billing system. We also introduce two different ESS operation strategies for peak load shaving and electricity consumption charge minimization respectively, and formulate each scheme. Historical data from Namgwangju substation are used for economical comparison of the strategies. The results show that the proposed algorithm is the most cost-effective ESS operation scheme among the strategies and reduces around 5 percent of electric charges compared to the charge without ESS operation.
A Study on the Behavior Characteristics of a Tensioning Device of a Catenary System According to the Longitudinal Dynamic Displacement of Railroad Bridge
Na, Youn-Il ; Lee, Jae-Bong ; Kim, Jae-Moon ; Kim, Yang-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1517~1522
DOI : 10.5370/KIEE.2015.64.10.1517
Since electric railroad vehicle pass through repeatedly on the railroad bridge, the dynamic load that causes the change of tension of contact wire affect it constantly. In this paper, we measured the dynamic displacement of the railroad bridges to analyze the effect of tension in the catenary. A result of dynamic measurement of the longitudinal displacement, it's maximum value was 39.9mm which was lower than the primary management criteria 378mm. Also on the based of a maximum temperature, it shows a feature that the longitudinal displacement value increased as temperature rise from April to October. In terms of behavior characteristics of a tensioning device, it was confirmed to be the value of 50mm stroke movement when the temperature changes ±5℃.
Study on Analysis of Operating Characteristics of Motor Block While KTX is Moving at Neutral Section of Kyung-Bu High Speed Line
Choi, Chang Hyun ; Lho, Young Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1523~1527
DOI : 10.5370/KIEE.2015.64.10.1523
Traction power is supplied by three-phase alternating current of 154 kV power grid and electric trains are operated on single phase feeding system. It becomes important to use all the three phases equally and convert them into two-phase electric power (90 degree phase rotation) for traction supply. This is achieved by special transformer from the adjacent traction substation which is separated by a neutral section. Neutral section locations are in front of the substation and between the two substations. The first stage of the Seoul-Busan high-speed railway, design curve radius is larger than 7,000 m and the greatest slope is 25. The railway track conditions are evaluated as good enough to install a neutral section at the first stage, but a few factors of coasting operation of the train should be considered at the second stage of Seoul-Busan high-speed railway. The neutral section was located at Kim-cheon substation, which made some neutral section problems produced by the operating train, and the neutral section was moved about 1.5 km to the south toward Dong Dae-gu station due to the track operation condition. Some of the trains which stopped at the existing Kim-cheon Gu-mi station produced another motor block failure after moving the neutral section. In this paper, power quality, system performance and track condition, etc. are suggested to solve the problems.
A Study on the Development of Propulsion Control Simulator for Maintenance Training of Railway Vehicle
Kim, Bo-Sung ; Jung, No-Geon ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 10, 2015, Pages 1528~1534
DOI : 10.5370/KIEE.2015.64.10.1528
This paper designed the railway vehicle running device with a proto-type for the railway vehicle maintenance training and developed a propulsion control device simulator equipped the imitation steering wheel. In addition, this paper applied a multi-thread technology in order to implement the staged fault and the propulsion control device protected operation test and an implementation of the failure that occur in actual rail vehicle and confirm the validity as the propulsion control device simulator for the maintenance training.