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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Transactions of the Korean Institute of Electrical Engineers P
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 60, Issue 4 - Dec 2011
Volume 60, Issue 3 - Sep 2011
Volume 60, Issue 2 - Jun 2011
Volume 60, Issue 1 - Mar 2011
Selecting the target year
Wide Band Monopole Antenna by Modified Ground of Coplanar Waveguide
Lee, Hyeon-Jin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 53~55
DOI : 10.5370/KIEEP.2011.60.2.053
The printed wide band monopole antenna having characteristics of dipole by modified coplanar wave guide(CPW) ground plane is presented. We are called a slot-arm printed monopole antenna and investigated the effect of the surface currents of the radiator on ground plane. The proposed antenna is treated as two asymmetric dipoles with the included angle of
degrees which lie along Z-direction symmetrically. It is observed that the effect of the surface currents on the radiation patterns is similar to that of the corresponding dipole. The length and width of the ground plane correspond the radius and length of the dipole respectively. This approach is also valid to general printed monopole antennas. The simulation impedance bandwidth of the proposed antenna the range of 2.4 to 4.6 [GHz] for a voltage stand wave ratio (VSWR)
2 and got pick gain of 6 [dBi]. So the proposed antenna is satisfied the requirement of the industry science medical (ISM) band operation.
Prediction of Academic Satisfaction and Academic Achievement Variables in Computer Education of Engineering College Class
Joo, Young-Ju ; Chung, Ae-Kyung ; Lee, Sang-Cheol ; Han, Ae-Ri ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 56~62
DOI : 10.5370/KIEEP.2011.60.2.056
The purpose of the present study is to examine prediction of perceived usefulness of learning, school support and learning flow on academic satisfaction, academic achievement and absenteeism in computer education of engineering college. To meet the purpose of the present study, D university was chosen and, two surveys were conducted among the engineering students enrolled in the computer application class. The results of this study through multiple regression analysis indicated that perceived usefulness of learning and school support predicted significantly on satisfaction(
= .21), In addition, perceived usefulness of learning and learning flow predicted significantly on achievement(
= .24), but absenteeism didn't predict significantly on any variables in this study. The results of this study suggested that perceived usefulness of learning, school support and learning flow should be considered as the important elements for designing instructional courses to enhance students' satisfaction and achievement in college education.
Vision Based Mobile Robot Control
Kim, Jin-Hwan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 63~67
DOI : 10.5370/KIEEP.2011.60.2.063
This paper presents the mobile robot control based on vision system. The proposed vision based controller consist of the camera tracking controller and the formation controller. Th e camera controller has the adaptive gain based on IBVS. The formation controller which is designed in the sense of the Lyapunov stability follows the leader. Simluation results show that the proposed vision based mobile robot control is validated for indoor mobile robot applications.
The Development of DCU for the Platform Screen Door
Woo, Chun-Hee ; Kim, Jin-Sik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 68~71
DOI : 10.5370/KIEEP.2011.60.2.068
In the case of Seoul Metro, prior to installation of platform screen doors, had seen 4~6 cases a month of mortal injuries from accidents on the platforms, including suicide attempts towards the oncoming train. However, since the installation of platform screen doors, Seoul Metro has achieved a feat of '0 mortal injuries'. In the initial stages of introducing platform screen doors domestically, due to a lack of experience in controlling platform screen doors, the products were imported and installed through technical cooperations from Japan, France and the United States. Thereafter, following investments in technologies by domestic firms, domestic production of parts such as overall control mechanism, specific control mechanism, RF devices and others were achieved. However, having installed platform screen doors in a relatively short period of time, DCU(Door Control Unit), an integral part of the whole platform screen door system, is yet to be fully domestically produced. At this moment in time, installation is being done with imported products or DCUs developed with DC motors. In this research, advantages and disadvantages of DC and BLDC motors for use in DCU will be analyzed and will produce an own BLDC controlling unit in order to solve any problems arised. Furthermore, the BLDC controlling unit produced will be integrated with DCU to improve the performance of the product and its price competitiveness.
Development of the Integral LED Package Board Power Supply Circuits for Noise Cancellation
Yu, Young-Jin ; Park, Jong-Chan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 72~75
DOI : 10.5370/KIEEP.2011.60.2.072
In this paper, the voltage across the LED system supplied by positive voltage of power supply system the power consumption of the LED itself, and uses a lot of transformers and analog devices, such as converter startup problems and constant temperature even when the voltage driving abnormally LED current in the destruction caused by the flow of a lot of problems can occur. In this paper, we obtain the technology of consistent current using PWM(pulse width modulation) mode in order to minimize analog devices and eventually discuss the technology to develop consistent output converter using power drive IC.
Frequency Estimation Technique using Recursive Discrete Wavelet Transform
Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 76~81
DOI : 10.5370/KIEEP.2011.60.2.076
Power system frequency is the main index of power quality indicating an abnormal state and disturbances of systems. The nominal frequency is deviated by sudden change in generation and load or faults. Power system is used as frequency relay to detection for off-nominal frequency operation and connecting a generator to an electrical system, and V/F relay to detection for an over-excitation condition. Under these circumstances, power system should maintain the nominal frequency. And frequency and frequency deviation should accurately measure and quickly estimate by frequency measurement device. The well-known classical method, frequency estimation technique based on the DFT, could be produce the gain error in accuracy. To meet the requirements for high accuracy, recently Wavelet transforms and analysis are receiving new attention. The Wavelet analysis is possible to calculate the time-frequency analysis which is easy to obtain frequency information of signals. However, it is difficult to apply in real-time implementation because of heavy computation burdens. Nowadays, the computational methods using the Wavelet function and transformation techniques have been searched on these fields. In this paper, we apply the Recursive Discrete Wavelet Transform (RDWT) for the frequency estimation. In order to evaluate performance of the proposed technique, the user-defined arbitrary waveforms are used.
Fluid Dynamic Bearing Spindle Motors for DLP
Kim, Yeung-Cheol ; Seong, Se-Jin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 82~90
DOI : 10.5370/KIEEP.2011.60.2.082
The small precision spindle motors in the high value-added products including the visible home appliances such as DLP projector require not only the energy conversion devices but also high efficiency, low vibration and sound operation. However, the spindle motors using the conventional ball bearing and sintered porous metal bearing have following problems, respectively: the vibration by the irregularity of balls and the short motor life cycle by the ball's abrasion and higher sound noises by dry contact between shaft and sleeve. In this paper, it is proposed that the spindle motor with a fluid dynamic bearing is suitable for the motor to drive the color wheel of the DLP(digital lightening processor) in the visible home appliances. The proposed spindle motor is composed of the fluid dynamic bearing with both the radial force and the thrust force. The fluid dynamic bearing is solved by the finite element analysis of the mechanical field with the Reynolds equations. The magnetic part of spindle motor, which is a type of Brushless DC Motor, is designed by the electro-magnetic field analysis coupled with the Maxwell equation. And the load capacity and the friction loss of fluid dynamic bearing are analyzed to bearing clearance variation by the fabrication error in designed motor. The design of the proposed motor is implemented by the load torque caused by the eccentricity and the unbalance of the fluid dynamic bearing when the motors are fabricated in error. The prototype of the motor with the fluid dynamic bearing is manufactured, and experiment results show the vibration, sound, and phase current at no load and color wheel load of the motors in comparison. The high performance characteristics with the low vibration, the low acoustic noise and the optimal mechanical structure are verified by the experimental results.
Study on the Performance of the Grooves for Fluid Dynamic Bearings
Kim, Yeung-Cheol ; Seong, Se-Jin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 91~93
DOI : 10.5370/KIEEP.2011.60.2.091
This paper is presented for the performance of the Fluid Dynamic Bearing(FDB) by the groove design and the tooling condition. Recently, spindle motors which require smaller size, lower sound noise, lower vibration, and higher speed of the rotation have been placed in high value-added products including Digital Lightening Processors(DLP), Hard Disk Drives(HDD), and ODDs. The spindle motors using the sintered porous metal bearing have higher vibration and acoustic noise by dry contact and large tolerance of the bearing parts. The Fluid Dynamic Bearing (FDB) with grooves is appropriate for spindle motors adequate in regards to mechanical vibration and acoustic noise. The paper shows the performance comparisons of between sintered porous metal bearing and FDB, and each FDBs according to the tooling deviations of grooves by the Finite Element Analysis(FEA) of the mechanical field. This paper shows the methods to make the grooves, the groove's depth, and the prototype of the motor with the fluid dynamic bearing. The performance characteristics of the grooves with the FDB are verified by the experimental results.
A Development of Ethernet-Based Remote Diagnosis System for DC Voltage Smoothing Capacitor using DSP
Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 94~98
DOI : 10.5370/KIEEP.2011.60.2.094
Electrolytic power capacitors today form essential components for virtually any power electronic system such as DC/DC converter or UPS. Frequently, electrolytic capacitors for DC link voltage smoothing are the key components which determine the life cycle of the whole unit and often are responsible for converter breakdown failures. In this paper, ethernet-based remote diagnosis system for DC voltage smoothing capacitor using DSP control board is developed. To estimate the status of the capacitor, the equivalent series resistor(ESR) of the component has to be determined. The ESR detection scheme is based on the determination of the capacitor ripple power losses calculated from DC link voltage/current measurement. Experimental results show the veridity and reliability of the proposed ethernet-based remote on-line capacitor diagnosis system.
Development of Intelligent Landscape Lighting Power Control and Monitoring System with Solar Cell Generator Equipment
Kim, Dong-Wan ; Park, Sung-Won ; Kim, Hyung-Su ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 2, 2011, Pages 99~104
DOI : 10.5370/KIEEP.2011.60.2.099
In this paper, the intelligent landscape lighting power control and monitoring system with solar sell generator equipment is proposed. The first, the intelligent landscape lighting power controller is designed using the fuzzy logic control method. And the fuzzy logic controller is used to save power consumption for various reference intensity of the illumination. The second, the GUI monitoring system is presented. It has control and display faculty. And the practical experiment device is used to evaluate the performance criteria of the proposed intelligent landscape lighting power control system with the solar cell power generation equipment. From the experiment results, we present the property of proposed fuzzy controller such as steady state error, the tracking and power consumption characteristic for the reference intensity of illumination. And also we show the superiority of power control as well as the characteristic of GUI monitoring system in the proposed system.