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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 59, Issue 12 - Dec 2010
Volume 59, Issue 11 - Nov 2010
Volume 59, Issue 10 - Oct 2010
Volume 59, Issue 9 - Sep 2010
Volume 59, Issue 8 - Aug 2010
Volume 59, Issue 7 - Jul 2010
Volume 59, Issue 6 - Jun 2010
Volume 59, Issue 5 - May 2010
Volume 59, Issue 4 - Apr 2010
Volume 59, Issue 3 - Mar 2010
Volume 59, Issue 2 - Feb 2010
Volume 59, Issue 1 - Jan 2010
Selecting the target year
Evaluation of Effects on Power System by Installing the Static Var Compensator
Yoon, Jong-Su ; Kim, Yong-Hak ; Kim, Soo-Yeol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1187~1193
This paper provides the methods for enhancing the stability with normal or emergency operating conditions in real power systems and copes with the unbalance of demand of reactive power due to the loss of facility, such as 765kV transmission line. In this paper, we focused on the maximum allowable transmission power(hereafter, MAXTP) in the metropolitan area. In order to increase the MAXTP, the application of reactive power compensators, SVC, and Shunt compensator and reactor, is analyzed as an enhancing method of stability and MAXTP. Particularly, the f-V analysis was performed for the postulated contingency, in order to evaluate the effects on SVC. Conclusively, the stability of power systems could be enhanced and the MAXTP is increased effectively with Dongseoul SVC which has the capacity 200MVAr.
Transient State Analysis of HTS Cable Using EMTP-RV
Ha, Chul-Jong ; Yang, Byeong-Mo ; Lee, Hyun-Chul ; Lee, Geun-Joon ; Baek, Young-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1194~1198
A high temperature superconducting power cable (HTS power cable) was applied large current capacity by no resistance in normal state. Fault state was risen out of over-current but, it was limited to resistance. this study was modeling equivalence, and unbalanced state analyzed operating charateristics of HTS power cable. The equivalence model was composed superconductor, shield, and former part. This model simulation was appeared conductor and shield current in normal state, but fault state was appeared former current as rise current by resistance. so it need to sufficiently influenced the quench characteristic when the former design.
22.9kV GIS Modeling and Transient Recovery Voltage Analysis Using EMTP/RV
Jyung, Tae-Young ; Baek, Young-Sik ; Jeong, Ki-Seok ; Park, Ji-Ho ; Seo, Gyu-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1199~1205
The recent power system is required to a large size of facilities and high power technology according to increasing power demand. However, it could lead to spoiling the beauty of city and environment problem. The miniaturized facilities with large capacity such as GIS have been required in recent power system. The GIS(Gas Insulated Substation) using the SF6 insulation gas enables to miniaturize facilities with large capacity with high insulation performance. However, the substation installed GIS has required to new design model which is different from the conventional substation. The TRV(Transient Recovery Voltage) analysis on simple circuit may applied by differential equation. However, in case of relatively complicated system, EMTP(Electro Magnetic Transients Program) mainly has been used to design and simulate for transient analysis. This paper mainly design the 22.9 kV GIS system and analyze the transient recovery voltage of main circuit breaker using EMTP/RV. It also enables to easily design the other substation installed GIS with same maker and voltage level because the proposed GIS model consists of separated modules such as busbar, circuit breaker, bushing, CT, PT etc. Eventually, it contributes to comfortably compare the interrupting performance of circuit breaker and system TRV corresponding to the substation system configuration.
Dynamic Characteristics Analysis of Jindo-Cheju HVDC System
Kim, Chan-Ki ; Lee, Seok-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1206~1213
The case that HVDC system is connected to the strong AC network has little the considering problems. However, because there are many problems(example for voltage stability, inertia and low frequency resonance) in case of connecting the weak AC system, a detailed attentions are needed. In particular, because HVDC system can control the flow of AC network freely, have to contain the range of stability and safe operation range. This paper deals with HVDC control algorithms, which are operated within 1 second on viewpoint of time domain, that is, transient stability. The target of HVDC introduced in this paper is Jindo-Cheju HVDC system, which will be operated at 2011. And the introduced algorithm can be actually implemented to Jindo-Cheju HVDC system.
Load Shedding Schemes of Under Frequency Relay to Improve Reliability in Power Systems
Kim, Kyu-Ho ; Song, Kyung-Bin ; Kim, Il-Dong ; Yang, Jeong-Jae ; Cho, Beom-Seob ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1214~1220
This paper proposes an efficient under frequency relay load shedding scheme for the korea power system which is more than two times than the system size and its capacity of the power system 10 years ago. The proposed method is keeping the power system stability and supports for the operating system during critical situations such as big disturbances and unstable in supply and demand. In order to determine the number of load shedding steps, the load to be shed per step, and frequency level, it is necessary to investigate and analyze maximum losses of generation due to the biggest contingency, maximum system overload, maximum keeping frequency, maximum load to be shed, and recovery frequency. The proposed method is applied to Off-peak load(25,400MW) and Peak load(62,290MW) of Korea Electric Power Corporation to demonstrate its effectiveness.
The Study of Steady-State Interaction Between AC and DC Lines on the Same Transmission Tower
Yoon, Jong-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1221~1225
The application of the AC and DC lines on the same transmission tower is an economical and practical approaching that increase the power transmission capacity of an existing transmission corridor. But, In this case, Inductive and capacitive coupling between AC and DC lines on the same tower should be investigated in advance. According to the installation plan of 80kV
60MW bipole HVDC in Cheju, KOREA that will be commissioned until 2011, DC lines will parallely operate with 154kV 2 AC lines in existed 154kV AC 4 lines transmission tower. This paper presents the steady state analysis results about the interaction between 154kV AC and 80kV DC lines in the same transmission tower.
Effect of Financial Transmission Rights on the Strategic Bidding Behavior of the Electricity Producers
Lee, Kwang-Ho ; Shin, Jae-Hong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1226~1231
This paper looks at the influence of Financial Transmission Rights (FTRs) on the market value(Social Welfare; SW) in the competitive electricity market. The transmission line constraints make it difficult to compute the Nash Equilibrium (NE) due to causing a mixed strategy NE instead of a pure strategy NE. Computing a mixed strategy is more complicated in a multi-player game. The aim of this paper are to compute a mixed strategy NE and analyze SW in power transaction with FTRs. This paper introduces a formula and a technique for solving NE of multi-player game with FTRs. In addition, it analyzes the influence of holding of FTRs by generation company on SW and it proposes the SW at NE is influenced by Power Transfer Distribution Factor (PTDF) where holder of FTRs are located. The assertion is verified by calculating the mixed strategy utilizing the Cournot model widely used for studies on FTRs.
Calculating the Optimal Capacity of Energy Storage System to Reduce CO
Emission for Power System in Je-Ju
Lee, Jong-Hyun ; Seol, So-Yeong ; Ko, Won-Suk ; Choi, Jung-In ; Bae, Si-Hwa ; Hong, Jun-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1232~1236
In this Paper, optimal capacity of energy storage and amount of
reduction in Jeju is calculated. Based on electricity demand data of Je-Ju from 2006 to 2007, the estimation electricity demand from 2009 to 2018 is performed. To calculate the amount of maximum
reduction and energy storage capacity in Jeju, the 4th power supply planning and IPCC guideline are used. Finally, Optimal capacity of energy storage and the amount of
reduction are showed.
A Study on the Characteristics of Supercapacitpr Module for High Voltage System
Kim, Byeong-Woo ; Hur, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1237~1241
Supercapacitors as novel energy storage devices between conventional capacitors and batteries, with more specific capacitance and energy densities than conventional capacitors and more power densities than batteries are to be used in many fields. Supercapacitor is regarded as one of good alternatives for meeting the requirement of market with excellent power performance and high cyclability. This paper deals with the characteristics of charge and discharge behavior of supercapacitor module for developing 42V hybrid energy storage system with lead acid battery and supercapacitor in order to adopt to 42V power net for vehicle. An analysis performed in this paper indicates that supercapacitor storage system may be cost effective for high cycle applications.
Analysis of Heat Source Distribution in Low Voltage Condenser
Kim, Jong-Gyeum ; Lee, Dong-Ju ; Kim, Il-Jung ; Park, Young-Jeen ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1242~1247
In this study, the heat source distributions at the end side and the center of the electrode are analyzed to estimate the electrical stress due to the harmonics from the nonlinear loads. The governing equation at the analysis area of low voltage condenser are numerically solved using the finite element software package to analyze the effects of heat source distribution due to the 5th and 7th harmonics, which can exist normally in the distribution network and can be applied to the low voltage condenser. Finally, the heat source distribution from the harmonics is compared and analyzed with the heat source distribution from the fundamental component of the applied voltage.
A Study on Deduction of Equivalent Circuit Parameters and Verification of Control Algorithm of Thrust Force of a Small-scaled LIM for a Railway Transit
Park, Chan-Bae ; Mok, Hyung-Soo ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1248~1254
Authors conducted a deduction of some parameters using the magnetic equivalent circuit method and a verification study of the thrust force control algorithm of a rotary-typed small-scaled linear induction motor for a railway transit. In a LIM, it is possible to express the parameters of the magnetic equivalent circuit into a function of the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. It means that the LIM properties can be changed considerably by the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. So, authors analyzed a tendency of changes of the magnetic equivalent circuit parameters and the LIM characteristics by changing of the airgap of the secondary aluminium plate of a rotary-typed small-scaled LIM. And authors conducted a verification study of the indirect vector control algorithm with constant slip frequency by using the rotary-typed small-scaled LIM tester set on the basis of the calculated LIM parameters. Finally authors accomplished a research on applicability for LIM railway transit.
The Characteristic of Formation CoSi
/Si Thin Film by the RF-Sputtering Method
Cho, Geum-Bae ; Lee, Kang-Yoen ; Choi, Youn-Ok ; Kim, Nam-Oh ; Jeong, Byeong-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1255~1258
In this paper, the
thin films with thicknesses of about
were deposited on n-type silicon (111) substrates by RF magnetron sputtering method using a
target (99.99%). The flow rate of argon of 50 sccm, substrate temperature of
, RF power of 60 watts, deposition time of 30 minutes, and the vacuum of
Torr. The annealing treatments of the
thin film were performed from 500, 700 and
for 1h in air ambient by an electric furnace. In order to investigate the
thin film X-ray diffraction patterns were measured using the X-ray diffractometer (XRD). The structure of the thin films were investigated by using scanning the electron microscope (SEM) were used for review. The surface morphology of the thin films was measured with a atomic force microscopy (AFM). Temperature dependence of sheet resistivity and property of Hall effect was measured in the
Electrical Characteristics for the Cu/Zn Chemical Cell using NaCl Electrolytes
Kim, Yong-Hyuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1259~1264
This paper was researched about effectiveness of the electrochemical cell which is composed of the sea water and the Cu/Zn electrode. The electric potential difference between copper and zinc finally reached 0.51 volts. Short current decreased with time. It might depend on the electromotive force decreasing. Confirmed the load resistance and electrode affect in electromotive force and electric current. The resistance which shows a maximum output power was 20[
], and the maximum output power from this resistance was evaluated as 0.736mW. In order to calculate the energy which creates from electrochemical cell, charging voltage of the capacitor with various capacitance was investigated. It was found that energy harvesting possibility of the cell which is made of a sea water electrolyte and the copper/the zinc.
Magnetic Field Reduction Characteristics of Shielding Wear Materials for Workers Using AC Arc Welder
Park, Jun-Hyeong ; Min, Suk-Won ; Lee, Seung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1265~1271
Power cable of an AC arc welder can surround a body of worker at the moment of welding. Applying the boundary element method, we calculated current densities induced in organs inside a worker to study the magnetic field reduction characteristics of shielding wear materials. We knew shielding wear with high permeability materials lowers current density more than high conductivity materials. We also found current density was lowest when high permeability materials were inside high conductivity materials in double layer shielding wear.
Preparation and Analysis of Cu Nanopowder by Wire Explosion in Distilled Water
Cho, Chu-Hyun ; Jin, Yun-Sik ; Kang, Chung-Il ; Lee, Gyung-Ja ; Rhee, Chang-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1272~1275
The Cu powder was prepared in distilled water. It has a wide range of size distribution. The submicron-sized particles in the Cu powder were removed by using continuous type centrifugal separator. The average particle size after classification was approximately 50nm. The XRD analysis showed that pure Cu phase and oxide phase (
Finite Element Analysis of Gas Discharge in Transient State Considering Secondary Electron Emission Effects
Kim, Nam-Kyung ; Jeung, Gi-Woo ; Choi, Nak-Sun ; Lee, Se-Hee ; Kim, Dong-Hun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1276~1281
To analyze the gas discharge phenomena in parallel-plane electrodes, the fully coupled finite element method (FEM) considering secondary electron emission effects in discharge column was adopted in this paper. Two coupled equations of the hydrodynamic diffusion-drift equations for three carriers and the Poisson's equation for electric scalar potential should be solved as a system equation. The proposed method including two secondary electron processes of the photoemission and background ionization has been successfully applied to evaluating the breakdown voltage in parallel-plane electrodes and is verified by comparing its numerical results with the experimental ones. From the obtained results, it is inferred that the proposed numerical scheme will be useful for predicting and understanding streamer transient phenomena.
A Study on the Characteristics of Microstrip Patch Antenna with Slot/T-Slot Capacitive Coupling
Seo, Ki-Won ; Roh, Hyoung-Hwan ; Seong, Yeong-Rak ; Oh, Ha-Ryoung ; Park, Jun-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1282~1288
This paper proposes a novel microstrip patch antenna to make impedance matching possible by using slot/T-slot capacitive coupling between the patch and 50
feed line on a ground plane. The single band/linear polarization patch antenna shows linear polarization at 2.4 GHz band. Under -10 dB return loss, the single band/linear polarization patch antenna obtains 50 MHz bandwidth at 2.37 GHz~2.42 GHz. The dual band/dual polarization microstrip patch antenna shows circular polarization at 2.4 GHz band and linear polarization at 3.1 GHz band. Under -10 dB return loss, The dual band/dual polarization microstrip patch antenna obtains 340 MHz bandwidth at 2.23~2.57 GHz and 375 MHz bandwidth at 2.95~3.325 GHz.
A New Robust Discrete Integral Static Output Feedback Variable Structure Controller with Disturbance Observer and Integral Dynamic-Type Sliding Surface for Uncertain Discrete Systems
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1289~1294
In this paper, a new discrete integral static output feedback variable structure controller based on the a new integral dynamic-type sliding surface and output feedback discrete version of the disturbance observer is suggested for the control of uncertain linear systems. The reaching phase is completely removed by introducing a new proposed integral dynamic-type sliding surface. The output feedback discrete version of disturbance observer is presented for effective compensation of uncertainties and disturbance. A corresponding control with disturbance compensation is selected to guarantee the quasi sliding mode on the predetermined integral dynamic-type sliding surface for guaranteeing the designed output in the integral dynamic-type sliding surface from any initial condition for all the parameter variations and disturbances. Using discrete Lyapunov function, the closed loop stability and the existence condition of the quasi sliding mode is proved. Finally, an illustrative example is presented to show the effectiveness of the algorithm.
A New Robust Variable Structure Controller With Nonlinear Integral-Type Sliding Surface for Uncertain More Affine Nonlinear Systems with Mismatched Uncertainties and Disturbance
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1295~1301
In this note, a systematic general design of a new robust nonlinear variable structure controller based on state dependent nonlinear form is presented for the control of uncertain affine nonlinear systems with mismatched uncertainties and mismatched disturbance. After an affine uncertain nonlinear system is represented in the form of state dependent nonlinear system, a systematic design of a new robust nonlinear variable structure controller is presented. To be linear in the closed loop resultant dynamics, the nonlinear integral-type sliding surface is applied. A corresponding control input is proposed to satisfy the closed loop exponential stability and the existence condition of the sliding mode on the nonlinear integral-type sliding surface, which will be investigated in Theorem 1. Through a design example and simulation studies, the usefulness of the proposed controller is verified.
A Study on the USN Zigbee Sensor Node for Transmission to Harmful Gas(CO, CO
) Sensing Data
Cheon, Dong-Jin ; Park, Young-Jik ; Lee, Seung-Ho ; Kim, Jeong-Seop ; Kwak, Dong-Kurl ; Jung, Do-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1302~1308
In this study, Zigbee Sensor Node to transmit harmful gases CO and
information using wireless communication within the ground and underground structures were developed. Wireless communication protocol was used Zigbee Stack included IEEE 802. 15.4 MAC protocol. For wireless transmission of detected harmful gas signal from ADC of MCU was implemented Zigbee Sensor Node that was developed protocol using Serial-Port-Profile(SPP) here. The proposed Zigbee Sensor Node was verified transmission distance from experiments. Transmission distance was into 90m in experiments. Distance experiments were measured at 10m intervals using sine & pulse wave input signal at indoors. The proposed Route Sensor Node was applied mesh routing protocol. When built up USN(Ubiquitous Sensor Network)using Route Sensor Node, transmission distance was not limited. On the experimental results, harmful gas values between direct measurements and USN measurements were consistent. The semiconductor CO sensor and N-DIR
sensor module as a harmful sensor was used. Therefore, the proposed Zigbee Sensor Node was verified about reliability and validity to build USN for transmission of harmful gas information.
A Vertical Line Following Guidance Law Design
Whang, Ick-Ho ; Cho, Sung-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1309~1313
In this paper, we propose a novel guidance law for controlling an UAV(Unmanned Air-Vehicle) to follow a reference line in vertical plane. A kinematics model representing the relative motion of the UAV to the reference line is derived. And then LQR(Linear Quadratic Regulator) theory is applied to the model to derive the VLFG(Vertical Line Following Guidance) law. The resultant guidance law forms a gain-scheduling controller scheduled by a simple parameter
which is a function of the UAV's velocity, axial acceleration, gravity, and the slope of the reference line. Also derived is a stability condition for the
variation based on Lyapunov theory. Simulation results show that the proposed guidance law can be applied effectively to UAV guidance algorithm design.
A Field Test of Diesel Generator Excitation Control System Using Real Time Simulator
Lee, Joo-Hyun ; Rhew, Ho-Sun ; Jeong, Tae-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1314~1319
The excitation control system of an emergency diesel generator is classified as a kind of safety-related system. Compared with other control systems in a power plant, this system is required to be more reliable and have better performance. KEPCO Research Institute successfully developed the excitation control system for a diesel generator. This paper presents its field test results by using a real time simulator on a nuclear power plant.
Design of Granular-based Neurocomputing Networks for Modeling of Linear-Type Superconducting Power Supply
Park, Ho-Sung ; Chung, Yoon-Do ; Kim, Hyun-Ki ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1320~1326
In this paper, we develop a design methodology of granular-based neurocomputing networks realized with the aid of the clustering techniques. The objective of this paper is modeling and evaluation of approximation and generalization capability of the Linear-Type Superconducting Power Supply (LTSPS). In contrast with the plethora of existing approaches, here we promote a development strategy in which a topology of the network is predominantly based upon a collection of information granules formed on a basis of available experimental data. The underlying design tool guiding the development of the granular-based neurocomputing networks revolves around the Fuzzy C-Means (FCM) clustering method and the Radial Basis Function (RBF) neural network. In contrast to "standard" Radial Basis Function neural networks, the output neuron of the network exhibits a certain functional nature as its connections are realized as local linear whose location is determined by the membership values of the input space with the aid of FCM clustering. To modeling and evaluation of performance of the linear-type superconducting power supply using the proposed network, we describe a detailed characteristic of the proposed model using a well-known NASA software project data.
A Time-based Apriori Algorithm
Kang, Hyung-Chang ; Yang, Kun-Tak ; Kim, Chul-Soo ; Rhee, Yoon-Jung ; Lee, Bong-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1327~1331
Association rules are very useful and interesting patterns for discovering preferences of each person in digital-content services. The Apriori algorithm is an influential algorithm for mining frequent itemsets for association rules. However, since this algorithm does not take into account reference times of each content as an important support factor, it cannot be used to extract associations among time-based data. This paper proposes an augmented Apriori algorithm discovers association rules using both frequencies and usage times of each item.
A Large-Signal Analysis of a Ring Oscillator with Feed-Forward and Negative Skewed Delay
Lee, Jeong-Kwang ; Yi, Soon-Jai ; Jeong, Hang-Geun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1332~1339
This paper presents a large signal analysis of ring-type oscillators with feed forward and negative skewed delay scheme. The analysis yields the frequency increase factor due to two schemes. The large signal analysis is needed, because small signal model is limited to the initial stage of oscillation. For verification of the frequency increase factor, simulation were done under the same conditions for the two different types of ring oscillators, i.e., with and without feed forward and negative skewed delay scheme. Simulation results are in good agreement with predictions based on analysis.
The Cause Analysis and Reduction Method of the FRC Noise Through a New Approach in TFT-LCD
Hwang, Jong-Hee ; Kim, Hye-Jin ; Choe, Yoon-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 7, 2010, Pages 1340~1345
FRC(Frame Rate Control) has been applied to the monitor and TV product as part of cost-saving in many flat panel display manufacturers. As FRC can represent the same number of gray scale level with bits of a smaller amount than bits of the input image data, it is widely used. However, FRC causes visual artifacts by using repeatedly pre-designed the FRC unit size of block pattern in display devices. Therefore, this paper analyzes the cause of the visual artifacts. And in order to improve them, it proposed the pattern arrangement of FRC unit blocks through frame rolling method as analytic solution for the first time. So, we could embody causes of FRC noise. Using the proposed structure, more robust pattern to FRC noise will be designed.