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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 60, Issue 12 - Dec 2011
Volume 60, Issue 11 - Nov 2011
Volume 60, Issue 10 - Oct 2011
Volume 60, Issue 9 - Sep 2011
Volume 60, Issue 8 - Aug 2011
Volume 60, Issue 7 - Jul 2011
Volume 60, Issue 6 - Jun 2011
Volume 60, Issue 5 - May 2011
Volume 60, Issue 4 - Apr 2011
Volume 60, Issue 3 - Mar 2011
Volume 60, Issue 2 - Feb 2011
Volume 60, Issue 1 - Jan 2011
Selecting the target year
Analysis of Economic Life Cycle for Hydro-Generator Based on Annual Equivalent Cost Method
Lee, Sung-Hun ; Chang, Jeong-Ho ; Kim, Jin-O ; Lee, Heung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 1993~1999
DOI : 10.5370/KIEE.2011.60.11.1993
Today, the power utilities is setting on the slow load growth and the aging of power equipment, and then could spend the efforts on the stability of system performance. Asset management may be defined as the process of maximizing corporate profit by maximizing performance and minimizing cost over the entire life cycle of power equipment. Therefore, asset management is great way to fulfill the economic investment and the stability of system performance. This paper presents the application of effective asset managem ent from an economic perspective. A proposed method is considering the life cycle analysis using life cycle cost methodology for hydro-generator during the total life cycle. The life cycle cost methodology include a way to calculating maintenance and operating costs. The proposed method will be expected to play an important role in investment decision making considering economic evaluation.
A Study on Protection of Generator Asynchronization by Impedance Relaying
Lee, Jong-Hweon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2000~2006
DOI : 10.5370/KIEE.2011.60.11.2000
Asynchronous phenomenon occurs on the synchronous generators under power system when a generator's amplitude of electromagnetic force, phase angle, frequency and waveform etc become different from those of other synchronous generators which can follow instantly varying speed of turbine. Because the amplitude of electromagnetic force, phase frequency and waveform differ from those of other generators with which are to be put into parallel operation due to the change of excitation condition for load sharing and the sharing load change, if reactive current in the internal circuit circulates among generators, the efficiency varies and the stator winding of generators are overheated by resistance loss. Where calculation method of protection settings and Logic for Protection of Generator Asynchronization will be recommended, A distance relay scheme is commonly used for backup protection. This scheme, called a step distance protection, is comprised of 3 steps for graded zones having different operating time. As for the conventional step distance protection scheme, Zone 2 can exceed the ordinary coverage excessively in case of a transformer protection relay especially. In this case, there can be overlapped protection area from a backup protection relay and, therefore, malfunctions can occur when any fault occurs in the overlapped protection area. Distance relays and overcurrent relays are used for backup protection generally, and both relays have normally this problem, the maloperation, caused by a fault in the overlapped protection area. Corresponding to an IEEE standard, this problem can be solved with the modification of the operating time. On the other hand, in Korea, zones are modified to cope with this problem in some specific conditions. These two methods may not be obvious to handle this problem correctly because these methods, modifying the common rules, can cause another coordination problem. To overcome asynchronizing protection this paper describes an improved backup protection coordination scheme using a new Logic that will be suggested.
A Study on an Algorithm of Line Switching and Bus Separation for Alleviating Overloads by the Use of Line Power Tracing and Sensitivity
Lee, Byung-Ha ; Hwang, Sung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2007~2016
DOI : 10.5370/KIEE.2011.60.11.2007
In this paper, a new algorithm for alleviating overloads in power networks by the use of line power tracing and sensitivity is proposed to perform line switching and bus separation effectively. Also, a new bus separation index based on line power tracing is presented to find the bus to be separated for relieving overloads effectively. By applying the sensitivity of the line flow with respect to the change of the line impedance, both switching-on and switching-off of the lines for alleviating overloads in power networks are performed systematically at once. The number of the considered cases for line switching and bus separation can be greatly reduced and the best combination of line switching and bus separation can be acquired efficiently by the use of the sensitivity and the bus separation index. In order to show the effects of this algorithm, it is applied to a small scale power system of IEEE 39-bus system and practical power systems of KEPCO.
Equivalent 10-Hz Flicker Index Calculation Using Half-cycle Sliding Window and Recursive RMS Method
Cho, Soo-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2017~2020
DOI : 10.5370/KIEE.2011.60.11.2017
Flicker, which is also known as voltage fluctuation, is an electromagnetic phenomenon generated by large scale nonlinear loads, such as arc furnaces and welding machines. Since a severe and continuous flicker can cause to some damages to electrically sensitive loads as well as human's visual irritations, it needs to be appropriately managed by being accurately measured, quantified and assessed. In Korea, an equivalent 10-Hz flicker index, shortly
, is used to determine the permission limit of flicker. This paper presents an efficient calculation of the flicker index by using a half-cycle sliding window and a recursive method, showing a concrete calculating procedure of
from the viewpoint of signal processing.
Congestion and Loss Cost for the Market Participants
Son, Hyun-Il ; Bae, In-Su ; Kim, Jin-O ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2021~2027
DOI : 10.5370/KIEE.2011.60.11.2021
Recently the power system consists of the more complicated structure, due to increase of power demands. In this circumstance, the congestion and loss capacity in transmission line is also increased. Accordingly, the investment planning of transmission system is required to reduce the congestion and loss of the transmission line. This paper proposes a method to compute the congestion and loss costs which are the key elements in economic assessment of the power system planning. And the benefit of market participants in CBP (Cost Based Pool) is computed. To demonstrate the efficient of the suggested methods, these methods are applied to peak load system of 2016 in the 4th Basic plan of Long-Them Electricity Supply and Demand.
154kV Main TR. Bay IED Based On IEC 61850
Roh, Jae-Keun ; Oh, Jae-Hoon ; Yang, Hang-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2028~2034
DOI : 10.5370/KIEE.2011.60.11.2028
Substation Automation System (SAS) based on IEC 61850 is becoming more and more reality in applying power systems. As well, the development of various engineering tools and the convergence with diagnostic systems are underway. To reflect recent advancements in SAS technology, the Korea Electric Power Corporation initiated a 154kV SAS pilot project and a smart power grid business in 2010. In this paper, the authors will summarize the overview and the lessons learned in applying the IEC 61850-based 154kV Main transformer bay IED solutions to these two project.
Optimal Design of an Outer-rotor Flux-switching Permanent Magnet Motor for High Speed Operation
Lee, Jae-Kwang ; Jang, Jin-Seok ; Kim, Byung-Teak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2035~2042
DOI : 10.5370/KIEE.2011.60.11.2035
In this paper, we proposed the outer-rotor type of FSPM motor for high speed operation and optimized motor shape. First of all, combinations of pole and slot numbers are examined for the optimal back-EMF and cogging torque, then optimizes the better shape design of the permanent magnet, rotor pole width. Further, The winding turns are obtained by circle of the voltage limit equation and motor parameters to minimize the current and to improve the efficiency. As a result, the performance of the designed model is satisfied, and it is verified through a two-dimensional finite element method (2D-FEA).
High Speed Operation of Fuel Injectors with Over Current Protection
Yang, Hyong-Yeol ; Suh, Eui-Suk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2043~2048
DOI : 10.5370/KIEE.2011.60.11.2043
High speed drive method for a fuel injector cleaner with current control is presented in this paper. The fuel injector cleaner is used for cleaning the fuel injectors in vehicles when it is clogged with deposit and rust. The fuel injector cleaner cleans the fuel injector by turning on and off the fuel injector rapidly. When the fuel injectors are cleaned, the switching speed is very important. However, when the fuel injector is turned off, the residual current in the fuel injector coil slows down the return action of the plunger in the fuel injector deteriorating performance and speed of the fuel injector cleaner. In this paper, fast turn off operation method of fuel injectors is developed for more effective cleaning. The simulation and experiment results show the validity of the proposed method.
Discontinuous Conduction Mode Current Control using a Current Gain Feedforward Compensation for Boost Converter
Lee, Seung-Goo ; Kim, Young-Roc ; Cha, Han-Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2049~2055
DOI : 10.5370/KIEE.2011.60.11.2049
In this paper a new current control method is proposed for the discontinuous conduction mode of boost converter. The proposed method using a current gain feedforward compensation adjusts a measured inductor current value and then, calculated an average current precisely in the discontinuous conduction mode as well as continuous conduction mode. By applying the proposed method, the current measurement error is significantly reduced to 2% regardless of the operating points. The proposed method is analyzed and its performance is investigated in simulation. To verify the feasibility of the proposed scheme, a 10kW 3-phase interleaved boost converter was built and experimental results are matched to the simulation results.
Development of the Operation Simulator for the PRT System
Jeong, Rag-Gyo ; Kim, Beak-Hyun ; Hwang, Hyeon-Chyeol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2056~2063
DOI : 10.5370/KIEE.2011.60.11.2056
A time based software simulator for the PRT system operation is presented. The purpose of the simulator is to estimate the passenger transportation performance of the PRT system. In this paper, it is presented how the system is modeled in the simulator to estimate passenger transportation performance and the running algorithm of the modeled subsystem. An application sample is also presented to find the system's design parameter to satisfy the transportation needs.
MPPT Control of Photovoltaic Generation Using MLPO Method
Choi, Jung-Sik ; Chung, Dong-Hwa ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2064~2075
DOI : 10.5370/KIEE.2011.60.11.2064
In this paper, robust multi-level perturbation and observation (MLPO) maximum power point tracking (MPPT) control are presented of the environmental change including the solar radiation and temperature. Because the maximum power point of the Photovoltaic (PV) is changing according to the solar radiation and temperature, the technology which traces the maximum power point in order to increase the power efficiency is recognized as the very important part. The general requirement for the MPPT is that system is simple, the cost is inexpensive, the PV tracking function and output change are small. Conventional perturbation and observation (PO) method is a simple system but there is the disadvantage that an efficiency of system becomes low. In addation, the incremental conductance (IC) control is required expensive CPU because of a large of calculations. In order to solve this problem, in this paper, the MLPO MPPT control using the method diversifying the step size according to the environment condition is presented. The validity of the MLPO method presenting from this paper is proved through analyzing the solar power generation output error at the steady state.
A Study on an Operating Conditions for the Direct Ethanol Fuel Cell
Kim, Young-Chun ; Koo, Bon-Kook ; Jang, Mun-Gug ; Ji, Hag-Bae ; Han, Sang-Bo ; Park, Jae-Youn ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2076~2082
DOI : 10.5370/KIEE.2011.60.11.2076
The goal of this paper is to find an operating conditions of the single direct ethanol fuel cell such as the cell temperature, and flow rates of ethanol and oxygen. To investigate the output characteristics, the electrical current increased from 0[A] with interval of 0.001[A] every 2[s], and the cell voltage was increased until the voltage became 0.05[V]. Related to the effect of the cell temperature, the output characteristics both voltage and power were increased upto 80[
] according to the increase of the current density, but those were decreased over that temperature. In addition, the optimal flow rate of ethanol in anode was identified as of 2[mL/min] due to the dependence of generation rate such as the hydrogen ion and electron. And the flow rate of oxygen in cathode was desirable to about 300[sccm/min], it might be affected by the chemical reaction rate of the water formation among hydrogen ion, electron, and oxygen. Consequently, the fundamental conditions were identified in this work, and it will be carried out to find the best conditions of membrane by the effect of the plasma surface treatment, and the effect of other catalysts except for a platinum.
Effects of Pressure on Properties of SiC-ZrB
Composites through SPS
Lee, Jung-Hoon ; Jin, Bm-Soo ; Shin, Yong-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2083~2087
DOI : 10.5370/KIEE.2011.60.11.2083
composites were produced by subjecting a 40:60 vol.% mixture of zirconium diboride(
) powder and
-silicon carbide (SiC) matrix to spark plasma sintering(SPS). Sintering was carried out for 60sec at
(designation as TP145 and TP146),
(designation as TP155 and TP156) and uniaxial pressure 50MPa, 60MP under argon atmosphere. The physical, electrical, and mechanical properties of the SiC-
composites were examined. The relative density of TP145, TP146, TP155 and TP156 were 94.75%, 94.13%, 97.88% and 95.80%, respectively. Reactions between
were not observed via x-ray diffraction (hereafter, XRD) analysis. The flexural strength, 306.23MPa of TP156 was higher than that, 279.42MPa of TP146 at room temperature, but lower than that, 392.30MPa of TP155. The properties of a SiC-
composites through SPS under argon atmosphere were positive temperature coefficient resistance (hereafter, PTCR) in the range from
. The electrical resistivities of TP145, TP146, TP155 and TP156 were
, respectively. The densification of a SiC-
composite through hot pressing depend on the sintering temperature and pressure. However, it is convinced that the densification of a SiC-
composite do not depend on sintering pressure under SPS.
A Study on Practicality of Condition Monitoring Method of Accelerated Thermal Aging CSPE
Lee, Jung-Hoon ; Goo, Cheol-Soo ; Kim, In-Yong ; Shin, Yong-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2088~2092
DOI : 10.5370/KIEE.2011.60.11.2088
The accelerated thermal aging of CSPE(chloro sulfonate polyethylene) of test cables were carried out for the period equal to 10, 20 and 30 years in air at
, respectively. The CSPE cables(TAIHAN electric wire Co. Ltd) which installed in nuclear power plant for three years were used as starting materials. Condition monitering methods of the accelerated thermal aging of CSPE cables were estimated through indenter modulus and OIT(oxidation induction time) of IEC 62582, and those were newly estimated through volume electrical resistivity, ultrasound reflection time, density, FE-SEM(field emission scanning electron microscopy), XPS(x-ray photoelectron spectroscopy), EDS(energy dispersive spectroscopy), and WD-XRF(wavelength dispersive x-ray fluorescence). A new condition monitoring methods of the accelerated thermal aging of CSPE cables were generally coincident with trend of indenter modulus expect EDS, XPS and XRF. A volume electrical resistivity among new condition monitoring methods of the accelerated thermal aging of CSPE cables is excellent. It is considered that life-time of CSPE cable can be predicted through volume electrical resistivity, if CSPE jacket was aged for period such as more than 20 years.
Structural and Electrical Properties of (Na
Ceramics with Addition of BiTiO
Lee, Tae-Ho ; Kim, Dae-Young ; Jo, Seo-Hyeon ; Jeong, Gwang-Ho ; Lee, Sung-Gap ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2093~2096
DOI : 10.5370/KIEE.2011.60.11.2093
In this study, lead-free
ceramics were fabricated by a conventional mixed oxide method. Structural and electrical properties of lead-free
ceramics with the variation of
were investigated. The results of X-ray diffraction analysis showed a typical polycrystalline perovskite structure without presence of the second phase in all specimens. Sintered density increased with an increasing of BTO and the specimen added with 0.07 mol% of
showed the maximum value of 97.8%. Average grain size decreased and densification increased with an increasing of
contents. The electromechanical coupling factor of the 0.01 mol%
doped NKN specimens was 0.32. Dielectric constant, dielectric loss and Curie temperature of the 0.07 mol%
doped NKN specimens were 1185, 0.145% and
Finite Element Analysis for Dielectric Liquid Discharge under Lightning Impulse Considering Two-Phase Flow
Lee, Ho-Young ; Lee, Jong-Chul ; Chang, Yong-Moo ; Lee, Se-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2097~2102
DOI : 10.5370/KIEE.2011.60.11.2097
Discharge analysis technique for dielectric liquid was presented by using the Finite Element Analysis (FEA) under a lightning impulse incorporating two-phase flow phenomena which described gas and liquid phases in discharge space. Until now, the response of step voltage has been extensively explored, but that of lightning impulse voltage was rarely viewed in the literature. We, therefore, developed an analyzing technique for dielectric liquid in a tip-sphere electrode stressed by a high electric field. To capture the bubble phase, the Heaviside function was introduced mathematically and the material functions for the ionization, dissociation, recombination, and attachment were defined in liquid and bubble, respectively. By using this numerical setup, the molecular dissociation and ionization mechanisms were tested under low and high electric fields resulted from the lightning impulse voltage of 1.2/50
. To verify our numerical results, the velocity of electric field wave was measured and compared to the previous experimental results which can be viewed in many papers. Those results had good agreement with each other.
Delay-dependent Robust Passivity for Uncertain Neural Networks with Time-varying Delays
Kwon, Oh-Min ; Park, Ju-Hyun ; Lee, Sang-Moon ; Cha, En-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2103~2108
DOI : 10.5370/KIEE.2011.60.11.2103
In this paper, the problem of passivity analysis for neural networks with time-varying delays and norm-bounded parameter uncertainties is considered. By constructing a new augmented Lyapunov functional, a new delay-dependent passivity criterion for the network is established in terms of LMIs (linear matrix inequalities) which can be easily solved by various convex optimization algorithms. Two numerical example are included to show the effectiveness of proposed criterion.
A Study on Development of SVC to Improve Harmonics and Power Factor of Power Plant
Yun, Gwang-Hee ; Lee, Hee-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2109~2118
DOI : 10.5370/KIEE.2011.60.11.2109
The power system has to maintain its synchronism from transient disturbances and oscillations. To achieve this, the static var compensator(SVC), which is a flexible AC transmission system(FACTS), is applied to the power system. SVC using an advanced control algorithm improves the stability of power system. This paper is a study on design of SVC to improve harmonics and power factor of power plant. The proposed SVC analyzes harmonics, voltage drop and reactive power in real time. On the basis of the analysis of the data, the SVC using a switching control algorithm decreases harmonic signals and increases the power factor. The experimental results show that the proposed SVC enhances the stability of power system.
A New Augmented Lyapunov Functional Approach to Robust Stability Criteria for Uncertain Fuzzy Neural Networks with Time-varying Delays
Kwon, Oh-Min ; Park, Myeong-Jin ; Park, Ju-Hyun ; Lee, Sang-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2119~2130
DOI : 10.5370/KIEE.2011.60.11.2119
This paper proposes new delay-dependent robust stability criteria for neural networks with time-varying delays. By construction of a suitable Lyapunov-Krasovskii's (L-K) functional and use of Finsler's lemma, new stability criteria for the networks are established in terms of linear matrix inequalities (LMIs) which can be easily solved by various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed methods.
Performance Comparison of 2D MUSIC and Root-MUSIC Algorithms for Anti-jamming in GPS Receiver
Jin, Mi-Hyun ; Lee, Ju-Hyun ; Choi, Heon-Ho ; Lee, Sang-Jeong ; Shin, Young-Cheol ; Lee, Byung-Hwan ; Ahn, Woo-Gwun ; Park, Chan-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2131~2138
DOI : 10.5370/KIEE.2011.60.11.2131
GPS is vulnerable to jamming because of extremely low signal power. Many anti-jamming techniques are studied for complement this vulnerability. Anti-jamming techniques using array antenna are most effective technique and these techniques are required the DOA estimates. MUSIC algorithm and Root-MUSIC Algorithm are typical algorithms used in DOA estimation. Two algorithms have different characteristics, so the choice of an algorithm may depends on many factors such as the environment and the system requirements. The analysis and performance comparison of both algorithms is necessary to choose the best method to apply. This paper summarizes the theory of MUSIC and Root-MUSIC algorithms. And this paper extends both algorithm to estimate two-dimensional angles. The software simulator of both algorithms are implemented to evaluate the performance. Root-MUSIC algorithm has the computational advantage on ULA. MUSIC algorithm is applicable to any antenna array. MUSIC shows better estimation performance when number of array element is small while the computational load of MUSIC is much higher than Root-MUSIC.
A Robust Adaptive Friction Control of Robot Manipulators using Sliding Surface
Bae, Jun-Kyung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2139~2146
DOI : 10.5370/KIEE.2011.60.11.2139
In this paper, a robust adaptive controller is proposed for trajectory tracking of robot manipulators with the unknown friction coefficient and bounded disturbance. A new adaptive control law is developed based on sliding mode and derived from the Lyapunov stability analysis. The introduction of a boundary layer solves the problem of chattering. The proposed adaptive controller is globally asymptotically stable and guarantees zero steady state error for joint positions. The estimated friction coefficients can also approach the actual coefficients asymptotically. A simulation example is provided to demonstrate the performance of the proposed algorithm.
Formation Motion Control for Swarm Robots
La, Byoung-Ho ; Kim, Sung-Ho ; Joo, Young-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2147~2151
DOI : 10.5370/KIEE.2011.60.11.2147
In this paper, we propose the formation control algorithm for swarm robots. The proposed algorithm uses the artificial potential field(APF) to plan the global path of swarm robots and to control the formation movement. The navigation function generates a global APF for a leader robot to reach a given destination and an avoidance function generates a local APF for follow robots to avoid obstacles. Finally, some simulations show the validity of the proposed method.
Behavior Control Algorithm for Space Search Based on Swarm Robots
Tak, Myung-Hwan ; Joo, Young-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2152~2156
DOI : 10.5370/KIEE.2011.60.11.2152
In this paper, we propose the novel behavior control algorithm by using the efficient searching method based on the characteristic of the swarm robots in unknown space. The proposed method consists of identifying the position and moving state of a robot by the dynamic modelling of a wheel drive vehicle, and planing behavior control rules of the swarm robots based on the sensor range zone. The cooperative search for unknown space is carried out by the proposed behavior control. Finally, some experiments show the effectiveness and the feasibility of the proposed method.
Design of Type-2 FCM-based Fuzzy Inference Systems and Its Optimization
Park, Keon-Jun ; Kim, Yong-Kab ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2157~2164
DOI : 10.5370/KIEE.2011.60.11.2157
In this paper, we introduce a new category of fuzzy inference system based on Type-2 fuzzy c-means clustering algorithm (T2FCM-based FIS). The premise part of the rules of the proposed model is realized with the aid of the scatter partition of input space generated by Type-2 FCM clustering algorithm. The number of the partition of input space is composed of the number of clusters and the individual partitioned spaces describe the fuzzy rules. Due to these characteristics, we can alleviate the problem of the curse of dimensionality. The consequence part of the rule is represented by polynomial functions with interval sets. To determine the structure and estimate the values of the parameters of Type-2 FCM-based FIS we consider the successive tuning method with generation-based evolution by means of real-coded genetic algorithms. The proposed model is evaluated with the use of numerical experimentation.
Theoretical Consideration About Separate Order for the Electrical Work - Focusing on the Policy Implementation Theory -
Kim, Hyo-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2165~2170
DOI : 10.5370/KIEE.2011.60.11.2165
The separate order for the electrical work is an institutional plan to improve the electrical construction quality and strengthen the competitiveness of the electrical contractors. The systematic approach for the policy implementation of the separate ordering system can make its adaptability higher and lead to a policy success. There are many kinds of effects on the implementation of the separate order, but institutional foundation is needed for increasing the policy adaptability. The necessity of the systematic and theoretical foundation was detected in various factors by considering policy implementation theory. In order to fix the separate ordering system, reasonable methods such as finding inducements and offering incentive are more effective than legal procedures. At last, a variety of policy adaptability plans must be founded in order to invigorate the separate ordering system in a view of the policy implementation.
Development of an Arc Detector Assessment System by Loss of Contact Between Pantograph and Contact Wire in Electric Railway
Park, Young ; Cho, Yong-Hyeon ; Kwon, Sam-Young ; Lee, Ki-Won ; You, Won-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2171~2175
DOI : 10.5370/KIEE.2011.60.11.2171
The objective of this paper is to discuss technologies on assessing reliability of arc detectors by composing a system that generates and simulates occurrence of arc caused by loss of contact between pantographs and contact wires in a laboratory condition. In order to establish the arc simulator, a device that generates light having the bandwidth of arcs that occur between carbon-metal. The simulator was designed under conditions of EN 50317 and simulations were conducted using the developed device. According to the results, it was possible to conduct certification tests following regulations of international standards and the precision of the simulator was satisfactory. The proposed arc detector assessment system is expected to enhance precision of current collection quality performance assessment methods at high-speed lines and conventional lines while being referred as fundamental technologies for development of detectors suiting international conditions.
The Life Cycle Cost Estimation using the Maintenance Information of a Propulsion Control System in the High Speed Train(KTX-1)
Kim, Jae-Moon ; Yun, Cha-Jung ; Kim, Yang-Su ; Jang, Jin-Yeong ; Lee, Jong-Seong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 11, 2011, Pages 2176~2181
DOI : 10.5370/KIEE.2011.60.11.2176
This paper estimates the life cycle cost(LCC) of a propulsion control system using the maintenance information in the high speed train(KTX-1). Life cycle costing is one of the most effective approaches for the cost analysis of long-life systems such as the KTX-1. Until now, most life cycle cost of the system has been studied as a whole system viewpoint. But in case of railway industry, LCC studies are needed on the subsystem like a propulsion control system because subsystems are developed continuously localization. This paper proposes the life cycle cost model which fitted to estimate life cycle cost (LCC) using maintenance information manual. As a result, LCC on propulsion control system increased moderately expect for periodical time when major parts are replaced at the same time. Results will be reflected in the development of domestic products.