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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 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
Assessment of Available Transfer Capability (ATC) considering Real-time Weather Conditions
Kim, Dong-Min ; Bae, In-Su ; Kim, Jin-O ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 485~491
Total Transfer Capability (TTC) should be pre-determined in order to estimate Available Transfer Capability (ATC). Typically, TTC is determined by considering three categories; voltage, stability and thermal limits. Among these, thermal limits are treated mainly in this paper on the evaluation of TTC due to the relatively short transmission line length of Korea Electric Power Corporation (KEPCO) system. This paper presents a new approach to evaluate the TTC using the Dynamic Line Rating (DLR) for the thermal limit. Since the approach includes not only traditional electrical constraints but also real-time environmental constraints, this paper obtains more cost-effective and exact results. A case study using KEPCO system confirms that the proposed method is useful for real-time operation and the planning of the electricity market.
Application of an Adaptive Step-size Algorithm to the Power System Model of Dispatcher Training Simulator
Hwang, Pyeong-Ik ; Ahn, Seon-Ju ; Moon, Seung-Il ; Yoon, Yong-Tae ; Hur, Seong-Il ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 492~498
Since it is almost impossible to train the dispatchers with real power system, the dispatcher training simulator(DTS) is used for the training. Among various components of the DTS, the power system model(PSM) emulates the dynamic behavior of the power system to calculate the frequency and voltage. The frequency is calculated from various parameters such as mechanical power of power plants, load, inertia, and the damping of the power system. In the PSM, the power plants are modeled as differential equations, so the mechanical power of the power plants are calculated by the numerical methods. Conventionally, the fixed step-size algorithm has been used in the PSM, however it has some drawbacks. This paper develops the prototype PSM using the Matlab, and analyzes the problems of the fixed step-size algorithm by comparing the results with those of PSCAD simulation. In order to overcome the limitations, this paper proposes a modified frequency calculation method using the adaptive step-size algorithm. From the simulation using the proposed method, it is verified that the accuracy of frequency calculation increases substantially while the simulation time is not greatly increased.
Analysis on Recloser-Fuse Coordination in a Power Distribution System linked Small Scale Cogeneration System with Superconducting Fault Current Limiter
Kim, Myoung-Hoo ; Kim, Jin-Seok ; Moon, Jong-Fil ; Lim, Sung-Hun ; Kim, Jae-Chul ; Lee, Joon-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 499~505
This paper analyzed that the coordination of recloser-fuse when a superconducting fault current limiter (SFCL) is installed to a power distribution system linked small scale cogeneration system. As a rule, the recloser to properly protect against both permanent and temporary fault is installed to upstream of fuse. Therefore, in a power distribution system linked small scale cogeneration system, the fault current is increased by adding fault current of small scale Cogeneration system when a permanent fault occurs, and the fuse could melt during the first fast operation of the recloser because of more sufficient heat from the increased current. However, when SFCLs are applied into a power distribution system linked small scale cogeneration system, the coordination of recloser-fuse could be accomplished due to decreased fault current as the effect of the impedance value of the SFCL. Therefore, to solve these problems, we analysed the operation of recloser-fuse coordination in a power distribution system linked small scale cogeneration system with SFCL using PSCAD/EMTDC.
Vulnerability Evaluation for Monitoring Wide Area Outage in Transmission Systems
Kim, Jin-Hwan ; Lim, Il-Hyung ; Lee, Seung-Jae ; Choi, Myeon-Song ; Lim, Seong-Il ; Kim, Sang-Tae ; Jin, Bo-Gun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 506~514
Defense systems are needed to prevent catastrophic failures of a power grid due to cascaded events. Cascaded events can be occurred by power flow overload. Especially, it is the most dangerous problem that overload line is outage, because it can make the power system face danger of cascaded. In this paper, vulnerability evaluation for monitoring wide are outage is proposed using by configuration information of transmission systems. This method of vulnerability evaluation is considered direct effect and indirect effect of power flow, especially overload. What is more, it can be used when the configuration of power system changes, as simple fault occurs or maintenance of facility. In the case studies, the estimation and simulation network have been testified and analysed in PSSE and C programming.
Development of an Energy Management Algorithm for Smart Energy House
Jeon, Jeong-Pyo ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 515~524
Recently, many actions are taking to accelerate progress toward social consensus and implementation of Smart Grid. Smart Grid refers to a evolution of the electricity supply infrastructure that monitors, protects, and intelligently optimize the operation of the interconnected elements including various type of generators, power grid, building/home automation system and end-use consumers. The most distinguished element will be Advanced Metering Infrastructure (AMI) that will be installed to every end-use consumer's home or building and optimize the energy consumption of the end-use consumer. The key function of AMI is energy management capability that coordinates and optimally controls the various loads according to the operating condition and environments. In this study, we figure out the basic function of AMI in Smart Energy House that can be defined as a model house implementing in Smart Grid. This paper proposes the energy management algorithm that will be implemented in AMI at Smart Energy House. The paper also show how energy saving in Smart Energy House can be achieved applying the proposed algorithm to an actual house model that has mainly lighting, air-conditioning, TV loads.
A Study on Local Coordinative Reactive Power Control between STATCOM and Other Reactive Power Controllers for Voltage Stability Improvement at Substation
Jeong, Ki-Seok ; Chang, Byun-Hoon ; Lee, Hyun-Chul ; Lee, Geun-Joon ; Baek, Young-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 525~530
Installation of FACTS(Flexible AC Transmission System) device can maximize utilization of existing power facilities and reliability of power system. STATCOM has excellent characteristics in operating cost, maintaining facilities, loss and so on. However, STATCOM has a disadvantage of facility cost over capacity. So it is effective to coordinate STATCOM and existing external bank(capacitor and reactor) and OLTC(On Load Tap Changer). This paper mainly proposes coordinative control method between STATCOM installed within substation and other reactive power resources including Shunt Reactors and Shunt Capacitors and OLTC for voltage stability improvement. The proposed coordinative control method is developed for the STATCOM of Mi-gum substation and the simulation results of EMTP/RV model show the effectiveness of the proposed method.
345kV Overhead Transmission Line Collapse Analysis and Countermeasures
Park, Jae-Ung ; Shin, Tai-Woo ; Choi, Jin-Sung ; Choi, Han-Yeol ; Min, Byeong-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 531~535
345kV Incheon Thermal Power Plant Transmission Line Collapse Analysis and Countermeasures. The Typhoon Galmaegi which had been formed in July 15, 2008 diminished into a tropical cyclone and cooled the air above the West Sea. The cooled air colliding with the warm inland air caused a strong whirlwind at some places in the west seaside; the whirlwind battered the 345kV Incheon Thermal Power Plant Transmission Line to be collapsed. The resistance of transmission towers against wind pressure, one of the key elements in transmission line engineering, is designed to endure the pressure corresponding to the maximum instantaneous wind speed. Before the above accident happened, no transmission line has ever been collapsed by a whirlwind. So this paper is aimed to analyze causes that collapsed 345kV Incheon Thermal Power Plant transmission line and to introduce countermeasures.
A Design of Incentive-based DR Program using Analytic Hierarchy Process (AHP)
Kim, Dong-Min ; Kim, Jin-O ; Rhee, Chang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 536~542
This paper presents an unique approach to scheme a demand response (DR) program in the electricity market from a customer-oriented perspective, which is based on the analytic hierarchy process (AHP). The proposed program has the objective to maintain the system reliability at the emergency period, and it is designed as an incentive-based program (IBP) considering Korea power systems with the cost-based generation pool (CBP). The DR program using AHP could represent the mutual importance degrees of load curtailment criteria from the viewpoint of different load-holders, thus customers' participation in this program is determined by the incentive payments corresponding the specific load curtailment conditions. A test system for the case study is used to demonstrate the usefulness and applicability of the proposed approach, and the load profiles with the proposed DR program and the required incentive payments are obtained. The results show not only the enhancement of system reliability but also the economic benefit within Pareto-improvement.
The Auxiliary Core Optimal Design of PMLSM to Reduce Detent Force by End Effect
Jang, Ki-Bong ; An, Ho-Jin ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 543~548
There are produced the detent force caused by slot-teeth structures, end-effect and parallel magnetization of permanent magnet in permanent magnet linear synchronous motor. In this paper, we proposed to establish the auxiliary core for reducing detent force which is generated the discontinuity of magnetic circuits by end effect. The optimal design of the auxiliary core used a finite element analysis and design of experiment. To demonstrate the validity of the paper, the experiment results are compared with analysis ones.
Optimum Design Criteria for Maximum Torque Density & Minimum Torque Ripple of Flux Switching Motor using RSM & FEM
Kim, Young-Hyun ; Lee, Jung-Ho ; Kim, Nam-Hoon ; Koo, Bon-Sam ; Kim, Chan-Hui ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 549~554
This paper deals with optimum design criteria for maximum torque density & minimum torque ripple of Flux Switching Motor (FSM) using RSM & FEM. The focus of this paper is to find a design solution through the comparison of torque density and torque ripple according to rotor shape variations. And then, a central composite design(CCD) mixed resolution is introduced, and analysis of variance (ANOVA) is conducted to determine the significance of the fitted regression model.
A Constant Current Controller Design for Power LED Drive
Kim, Eung-Seok ; Kim, Cheol-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 555~561
In this paper, the constant current controller is designed to regulate the driving current of a power LED. The controller design model of the power LED including its driving circuit is proposed to design the constant current controller. A buck converter is also introduced to drive the power LED. The PI-based digital controller is implemented to validate the proposed strategy for the power LED driving.
Linear Position Detection using Magnetic Sensors for Transverse Flux Linear Motor Drive
Kim, Ji-Won ; Won, Jin-Kuk ; Lee, Ji-Young ; Kang, Do-Hyun ; Kim, Jang-Mok ; Chang, Jung-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 562~568
In this paper, a low cost magnetic position sensor for linear position detection is proposed. The proposed magnetic sensor can be applied to the linear motor which has stator with periodical teeth, such as transverse flux linear motor(TFLM). Sine and cosine waves can be generated from the unit sensor module as the linear motor moves, and the outputs can be converted to the position data by interpolation IC. To reduce the speed ripple caused by the position error, the Luenberg observer is introduced. The validity of the proposed magnetic position sensor is verified by experiment with a 750N three-phase TFLM.
The Driving Circuit Design for ZVS Full-Bridge Converter with 1st Order Delay Circuit
Cho, Nae-Soo ; Choi, Youn-Ho ; Yoon, Kyung-Sup ; Koo, Bon-Ho ; Kwon, Woo-Hyen ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 569~574
The full bridge converter have been used for high power system that is needed to switch the big current. So, EMI and stability problem is occurred. The Soft switching method is the solution to solve the above problem, But implementation of soft switching(ZVS: Zero Voltage Switching) is so complicate and expensive because of the DSP MCU and shift circuit. In this paper, we introduce the technical method for driving circuit of ZVS full bridge converter with 1st order delay circuit and logic elements. The realization of this method is so simple and cheap. The effectiveness of the proposed circuit is verified by experimental results.
A Study of Failure Mode for 3 Phase VSI by Power Loss Averaging Technique
Cho, S.E. ; Park, S.J. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 575~580
This paper is to design an optimum power conversion device for the system required for development of a low cost 3-phase power inverter. For this purpose, in order to meet with endurance required by the industry, failure mode is standardized to guarantee lifetime of a power semiconductor by monitoring real time power loss and to facilitate failure mode analysis. As normality of heat loss of a power semiconductor is identified remaining in a certain range by comparing heat rise slope between that is calculated by using average current or average loss and that is measured at a heat sink, its feasibility is confirmed by experiment.
A Study on the Output Characteristics for the Cantilever Piezoelectric Bimorph
Kim, Yong-Hyuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 581~587
Using piezoelectric elements to harvest energy from ambient vibrations has been of great interest over the past few years. Due to the relatively low power output of piezoelectric materials, there are many study to improve the energy harvesting efficiencies. This paper is study the efficiencies of the output energy considering the cantilever piezoelectric bimorph using aluminum vibration beam. when the length of vibration beam and the piezoelectric body becomes same and the maximum output power comes out. DC voltage was increased as the beam thickness and vibration frequency was increased. The vibration beam was able to achieve very large energy value.
Effects of the Sputtering Thickness and the Incident Angle of Pt Film Deposition as a Counter Electrode for Dye-sensitized Solar Cells
Kim, Hee-Je ; Yeo, Tae-Bin ; Park, Sung-Joon ; Kim, Whi-Young ; Seo, Hyun-Woong ; Son, Min-Kyu ; Chae, Won-Yong ; Lee, Kyoung-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 588~593
Sputter deposition on a Pt counter electrode was studied using radio frequency (RF) plasma as the improvement of incident photon to current conversion efficiency (IPCE) for dye-sensitized solar cells (DSCs). Effects of the sputtering thickness and the incident angle on a Pt counter electrode for DSCs were investigated. Experiments to get the optimal sputtering time for the performance of the DSCs were carried out. And it is found that the optimized sputtering time was 120 seconds, in addition, the incident angles of the substrate was adjusted from
. The maximum efficiency of 5.37% was obtained at the incident angle of
with an active cell area of
Enhanced field emission properties of double-walled carbon nanotubes coated with lead selenide nanoparticles
Shin, Dong-Hoon ; Lee, Cheol-Jin ; Choi, Young-Min ; Kim, Jong-Ung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 594~598
We studied on the field emission properties of double-walled carbon nanotubes (DWCNTs) coated with lead selenide (PbSe) nanoparticles. PbSe nanoparticles were uniformly attached on the surface of the DWCNTs by a simple chemical process. The PbSe-coated DWCNTs showed highly increased emission current density and enhanced emission stability over 20 h, compared with raw DWCNTs. We consider that the enhanced field emission properties of PbSe-coated DWCNTs were attributed to the increased field enhancement factor and lowered work function of the emitters.
Effective Ionic Wind Generation Utilizing a Cylindrical Corona Discharge Electrode
Jung, Jae-Seung ; Moon, Jae-Duk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 599~603
A point-mesh type corona system has been well used as a ionic wind blower. However this type corona system suffers from its lower ionic wind generation, because of its lower on-set and breakdown voltages of its very sharp needle point corona electrode. This means that the point corona electrode must act both as an effective ion-generator and a very higher electric field producer in the discharge airgap in order to generate higher ionic wind velocity. In this paper, a cylinder-mesh type discharge system as a ionic wind generator is proposed and investigated. The cylindrical corona electrode can produce many ions from its sharpened edge, and the corona on-set and breakdown voltages are very higher than those of the needle point corona electrode. As a result, this type cylindrical corona electrode might generate a higher ionic wind than the needle point corona electrode.
Effect of Radius of Curvature of a Corona Needle on Ionic Wind Generation
Hwang, Deok-Hyun ; Moon, Jae-Duk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 604~608
An electric fan for cooling high density electronic devices is limited and operated in very low efficiency. The corona discharge is utilized as the driving mechanism for an ionic gas pump, which allows for air flow control and generation with low noise and no moving parts. These ideal characteristics of ionic pump give rise to variety applications. However, all of these applications would benefit from maximizing the flow velocities and yields of the ionic pump. In this study, a needle-mesh type ionic pump has been investigated by focusing on the radius of curvature of corona needle points elevating the ionic wind velocity and efficiency. It is found that the radius of curvature of the corona discharge needle point influences significantly to produce the ionic wind and efficiency. As a result, an elevated ionic wind velocity and increased ionic wind generation yield can be obtained by optimized the radius of curvature of the corona needle electrode.
Optimization of Heatsink and Analysis of Thermal Property in 75W LED Module for Street Lighting
Lee, Seung-Min ; Lee, Se-Il ; Yang, Jong-Kyung ; Lee, Jong-Chan ; Park, Dae-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 609~613
In this paper, we optimized and simulated the heatsink of 75W LED module for street lighting and evaluated the optical properties with the manufactured heatsink. the structure of LED package make simple as chip and heatslug and thermal flow is analyzed by using the FEM(Finite Element Method) with CFdesign V10. Also, we measured the temperature of heatsink and evaluated the optical properties with infrared thermal image camera and integrated sphere system for luminous flux in
box. As results, Heatsink optimized in 3 mm pin thickness, 6 mm base thickness and 16 number of pin count by using Heatsink-designer and got the results which is the temperature of
and thermal resistance of
. In thermal flow simulation, the temperature of heatsink decreased from
and the temperature of heatsink by the time in real measurement decreased from
. Moreover, we improve 0.68 % in the decreased ratio of the luminous flux.
The Development Of Program Based On Model to Control Generator Output in Power Plant
Lim, Geon-Pyo ; Kim, Mun-Soo ; Choi, In-Kyu ; Park, Doo-Yong ; Kim, Ho-Yol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 614~622
The goal of this paper is to develope the control program based on model which can be applied to 1000MW class coal fired thermal power plant. 1000MW class power plant has the higher efficiency and lower cost because the steam conditions of the ultra super-critical process are higher than them of the previous power plants in temperature and pressure. The program includes the state variable controls which have the desired characteristics for the higher temperature and pressure. The program had been developed successfully using advanced process control. The simulation results using the new control program showed the better performance and safer control than them of the previous control program and we could verify the application possibility of the new program for the actual power plant through the load test, comparison, analysis and tuning.
A New Robust Variable Structure Controller with Nonlinear Integral-Type Sliding Surface for Uncertain Systems with Mismatched Uncertainties and Disturbance
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 623~629
In this paper, a new robust variable structure controller based on a nonlinear integral type sliding surface is presented for the control of uncertain systems with mismatched uncertainties and disturbance. A nonlinear integral type sliding surface is suggested for removing the reaching phase. After its ideal sliding dynamics is obtained, the two design methods are presented. A corresponding control input is proposed to satisfy the closed loop stability in the sense of Lyapunov 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 study, the usefulness of the proposed controller is verified.
A New Robust Discrete Static Output Feedback Variable Structure Controller with Disturbance Observer for Uncertain Discrete Systems
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 630~635
In this paper, a new discrete static output feedback variable structure controller based on a new 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 dynamic-type sliding surface. The output feedback discrete version of disturbance observer is derived for effective compensation of uncertainties and disturbance. A corresponding control with disturbance compensation is selected to guarantee the quasi sliding mode on the predetermined dynamic-type sliding surface for guaranteeing the designed output in the dynamic-type sliding surface from any initial condition for all the parameter variations and disturbances. Using 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.
On-Road Succeeding Vehicle Detection using Characteristic Visual Features
Adhikari, Shyam Prasad ; Cho, Hi-Tek ; Yoo, Hyeon-Joong ; Yang, Chang-Ju ; Kim, Hyong-Suk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 636~644
A method for the detection of on-road succeeding vehicles using visual characteristic features like horizontal edges, shadow, symmetry and intensity is proposed. The proposed method uses the prominent horizontal edges along with the shadow under the vehicle to generate an initial estimate of the vehicle-road surface contact. Fast symmetry detection, utilizing the edge pixels, is then performed to detect the presence of vertically symmetric object, possibly vehicle, in the region above the initially estimated vehicle-road surface contact. A window defined by the horizontal and the vertical line obtained from above along with local perspective information provides a narrow region for the final search of the vehicle. A bounding box around the vehicle is extracted from the horizontal edges, symmetry histogram and a proposed squared difference of intensity measure. Experiments have been performed on natural traffic scenes obtained from a camera mounted on the side view mirror of a host vehicle demonstrate good and reliable performance of the proposed method.
Bimodal-tram Simulator using PXI Embedded Real-time Controllers
Byun, Yeun-Sub ; Kim, Young-Chol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 645~650
In this paper we present the Bimodal-tram simulator using the PXI embedded real-time controllers. The Bimodal-tram is developed in KRRI (Korea Railroad Research Institute). The vehicle can be automatically operated by navigation control system (NCS). For the automatic driving, the vehicle lanes will be marked with permanent magnets that are placed in the ground. The vehicle is controlled by NCS. NCS governs the manual mode and automatic mode driving. The simulator is designed by an identical conception with the real control condition. The dynamic motion of vehicle is simulated by the nonlinear dynamic model. The control computer calculates the control values. The signal interface is linked by CAN communication. The simulation is processed by real-time base. The test driver can see the graphic motion of vehicle and can operate the steering wheel, gas and brake pedal to control direction and velocity of vehicle during the simulation. At present, the simulator is only operated by manual mode. The automatic mode will be linked after the control algorithm is finished. We will use the simulator to develop the control algorithm in the automatic mode. This paper shows the simulator designed for Bimodal-tram using real-time based controller. The results of the test using the simulator are presented and discussed.
Dynamic PCA algorithm for Detecting Types of Electric Poles
Choi, Jae-Young ; Lee, Jang-Myung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 651~656
This paper proposes a new dynamic PCA algorithm to recognize types of electric poles, which is necessary for a mobile robot moving along the neutral line for inspecting high-voltage facilities. Since the mobile robot needs to pass over the electric poles and grasp the neutral wire again for the next region inspection, the detection of the electric pole type is a critical factor for the successful passing-over the electric pole. The CCD camera installed on the mobile robot captures the image of the electric pole while it is approaching to the electric pole. Applying the dynamic PCA algorithm to the CCD image, the electric pole type has been classified to provide the stable grasping operation for the mobile robot. The new dynamic PCA algorithm replaces the reference image in real time to improve the robustness of the PCA algorithm, adjusts the brightness to get the clear images, and applies the Laplacian edge detection algorithm to increase the recognition rate of electric pole type. Through the real experiments, the effectiveness of this proposed dynamic PCA algorithm method using Laplacian edge detecting method has been demonstrated, which improves the recognition rate about 20% comparing to the conventional PCA algorithm.
Prevent Illegal Access Control for Secure Healthcare System
Seo, Dae-Hee ; Baek, Jang-Mi ; Moon, Yong-Hyuk ; Cho, Dong-Sub ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 657~663
Today, rapid evolution of Internet makes various types of services in ubiquitous environment are intelligent and active. As a result, user's demand on high quality of life increases and health care service based on ubiquitous environment draws a lot of attention. However, user's private information used for health care service is illegally distributed and exposed, causing serious individual and social problems. Therefore, this thesis is intended to suggest a secure health care service to prevent unauthorized third party's access and to protect user's privacy in health care systems. The proposed scheme establishes a session key through communication channel between health care system and user based on explicit mutual authentication and provides secure communication and access control, improving security as one of the leading health care systems.
A SoC based on the Gaussian Pyramid (GP) for Embedded image Applications
Lee, Bong-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 664~668
This paper presents a System-On-a-chip (SoC) for embedded image processing and pattern recognition applications that need Gaussian Pyramid structure. The system is fully implemented into Field-Programmable Gate Array (FPGA) based on the prototyping platform. The SoC consists of embedded processor core and a hardware accelerator for Gaussian Pyramid construction. The performance of the implementation is benchmarked against software implementations on different platforms.
An Active Broadband Noise Control System based on the MuItiband-Structured Delayless Subband Adaptive Filter
Kim, Shin-Wook ; Jeon, Hyeon-Jin ; Park, Min-Woo ; Lee, Woo-Gun ; Chang, Tae-Gyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 669~673
This paper proposes a new active noise control (ANC) system for canceling broadband noise. The proposed ANC system is designed based on the multiband-structured delayless subband adaptive filter (MDSAF), which has advantages of fast-convergence speed and higher noise reduction performance by eliminating the aliasing and band-edge effects caused by band-partitioning. The simulation results show that the proposed ANC system has faster convergence speed as compared to the conventional ANC systems and effectively reduces the wideband noise.
Comparison of Movement of Rapid Alternating Movements of Hands in Idiopathic Parkinson's Disease Patients and Normal Subjects using Angular Velocity Measurement System
Kim, Ji-Won ; Kwon, Yu-Ri ; Eom, Gwang-Moon ; Jun, Jae-Hoon ; Yi, Jeong-Han ; Lee, Jeong-Whan ; Kwon, Do-Young ; Koh, Seong-Beom ; Park, Byung-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 3, 2010, Pages 674~677
The purpose of this study was to analyze bradykinesia of forearm movement in patients with Parkinson's disease (PD) as compared to those of normal subjects. A gyrosensor was selected for the measurement of forearm movement, because it can provide angular velocity signal which is free from the gravitational artifact and also because it can be conveniently used during clinical test of bradykinesia. Forty PD patients (age:
yrs, H&Y stage:
), 14 age-matched elderly subjects (
yrs) and 17 healthy young subjects (
yrs) participated in this study. Angular velocity during forearm movement of pronation/supination was measured in both arms. Suggested quantitative measures of bradykinesia were root-mean-squared (RMS) angular velocity, RMS angle, peak power and total power which were derived from the angular velocity. ANOVA showed that all measures were significantly different among three groups (p<0.001). Subsequent post-hoc test revealed that all measures in PD patients were significantly smaller than in healthy elderly and healthy young subjects (p<0.05). This results suggest that PD patients can be differentiated from normal subjects using suggested measures.