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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
Assessment of the CO
Emission Considering the Generator Maintenance Scheduling
Jeon, Dong-Hoon ; Park, Jeong-Je ; Oh, Tae-Gon ; Cho, Kyeong-Hee ; Choi, Jae-Seok ; Baek, Ung-Ki ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1507~1513
emission can be decreased due to freedom of generator maintenance scheduling(GMS). This paper proposes assessment of
emission considering generator maintenance scheduling(GMS) and evaluates effect of the GMS on
emission. And also, this paper assesses the
emission and the probabilistic production cost simulation of nuclear and thermal power generators considering operation of hydro and pumped generator. The minimum reliability criterion level satisfied production cost minimization function model is used in this paper. The practicality and effectiveness of the proposed approach are demonstrated by simulation studies for a real size power system in Korea in 2010.
A Study on the Concept Design of Cheju HVDC #2
Kim, Chan-Ki ; Lee, Seok-Jin ; Seo, Woo-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1514~1522
This paper dealt with the HVDC concept design of Cheju HVDC #2, which will be operated at 2011. The concept design is the first step of HVDC design procedures and the contents which were presented in this paper, are HVDC operation conditions based on the reliability of HVDC and AC network conditions, short circuit ratios(SCR) to related to HVDC stability and overvoltage and interactions between AC network including FACTS and generators, and HVDC system. The results of this paper are a keystone of HVDC #2 design.
A Study on the Economical PQMS of the Utility Distribution Power System
Park, Yong-Up ; Lee, Keon-Hang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1523~1529
This paper describes the distribution power system econimical PQMS(Power quality monitoring system) of Utility. Recently, the korea power quality standard has been established based on the IEC Std. By IEC Std., the power quality assessment point is measured in PCC(Point of common coupling). In this case, the utility has to construct PQM system in all customer PCC point and the PQ meter cost would be very high in order to acquire the suitable data. Also the distribution system would be encounter the communication overload problem due to the huge data. Accordingly the utilities could not apply to PQM system in the distribution power system by the cost and communication problem. In this paper, the proposed economical PQMS has the voltage and current signal reiteration function and FFT operation function is transferred the server. Also the voltage and current measurement channels are minimized by a classified substation construction.
Study on the Development of Load Shedding Scheme for Improving Voltage Stability of Seoul Metropolitan Area using Synchro-phasor Data
Shin, Jeong-Hoon ; Nam, Su-Chul ; Baek, Seung-Mook ; Lee, Jae-Gul ; Moon, Seung-Pil ; Kim, Tae-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1530~1539
Recent technology advancement related to computer & communication and measuring devices allows system operators to adopt more intelligent monitoring and control systems to their power systems in order to prevent massive system blackout. Among them, wide-area monitoring and control(WAMAC) system based on synchro-phasor technology has been widely applied to power systems for their own purposes. In this paper, the study on the development of load shedding scheme to improve voltage stability in KEPCO system is introduced. Summary of WAMAC technology being developed and applied in the world through extensive literature survey is proposed. And methodology to develop voltage stability index and multi-step load shedding scheme based on synchro-phasor data is also presented.
Development and Installation of Voltage Management System for Voltage and Reactive Power Control of Wide Area System
Nam, Su-Chul ; Shin, Jeong-Hoon ; Baek, Seung-Mook ; Lee, Jae-Gul ; Moon, Seung-Pil ; Kim, Tae-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1540~1548
KEPCO proposes enhanced voltage management system that is a coordinate voltage control system between the hierarchical voltage control system and the slow voltage control system. It has been installing in Jeju island. VMS consists of a master controller, CVC (Continuous Voltage Controller) and DVC (Discrete Voltage Controller). CVC consists of main controller, FDMU (Field Data Measurement Unit) and several RPDs (Reactive Power Dispatcher). CVC has a control scheme with AVRs of generator to maintain the voltage of a pilot bus in a power system, DVC has a control scheme with static reactive power sources, like a shunt capacitor, a shunt reactor, ULTC and so on, to maintain the reactive power reserve of a power system and a master controller is executed to recover reactive power margin of a power system through coordinated control between CVC and DVC.
Designing of Smart WAMAC Infra Architecture based on Synchro-Phasor
Kim, Ji-Young ; Woo, Doug-Je ; Kim, Sang-Tae ; Choi, Mi-Hwa ; Kim, Yong-Kwang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1549~1559
Modern power system is operated and managed in closed network environment with treating a great variety of data, and requirement of real time power system data is more increasing. However, it is difficult for operators to fast evaluate the condition of power system using only isolation network system such as SCADA or EMS regarding unexpecting situations occurring. Recent technology achievement in areas of distributed computing, networking high speed communications and digital control as well as the availability of accurate GPS time source are rapidly becoming the enabling factors for the development of a new generation of real time power grid monitoring tools. In this paper, architecture of WAMAC which is the wide area monitoring and control system not only to control but also to monitoring in real time is proposed and the plan of integration interface with legacy system such as EMS for providing power system analysis base data effectively is suggested.
An Implementation of Real-time Measurement and Assessment System for Power Quality Characteristics of Grid Connected Wind Turbines
Lee, Jong-Joo ; Kim, Dong-Joon ; Moon, Young-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1560~1565
The renewable resource are getting more attentions with increased concerns on the depletion of fossil fuels and several environmental issues like emission problem. Wind power is a representative option among several renewable sources and the generation capacity using wind power is being increased. However, the wind generation is so volatile on its output characteristic, so it is required to assess the grid impact of wind power generation by measuring the fluctuation effect more precisely. This paper proposes the method for measuring the generation output according to IEC 61400-21(Measurement and assessment of power quality characteristics of grid connected wind turbines) to assess the power quality of wind turbine generation. In addition, it shows an application case to a small-scale wind power generator. In the case study, it suggests a structure design of the proposed measurement instrument both on hardware and software aspects, which is composed of a remote monitoring & data analysis program and an FPGA based real-time signal processing device.
A Study on the Implementation Issues for Demand-side Management of Energy Suppliers
Kim, Hyeong-Jung ; Son, Hag-Sig ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1566~1574
This paper presents an in-depth review for current status for demand-side management (DSM) investment of energy supplier and an useful prospect on the introduction of Energy Efficiency Resource Standards (EERS). According to the Article 9 of Rational Energy Utilization Act, Energy suppliers-Korea Electric Power Corporation (KEPCO), Korea Gas Corporation (KOGAS) and Korea District Heat Corporation (KDHC) prescribed by Presidential Decree-must establish and implement annual demand-side management investment plan to improve energy efficiency in production, transformation, transportation, storage and usage of corresponding energy and to reduce demand and green house gas emissions. In this paper, we examine the DSM programs of energy suppliers and the results of DSM investment in 2009, then we propose a reasonable solution for the development of DSM investment. Furthermore, in order to compare our situation, the case studies were conducted on EERS issues in England, Italy, France and U.S, such as establishing the energy saving target, selecting the target energy supplier, and penalty and incentive mechanisms. Throughout the case studies, this paper suggests the directions to the DSM investment planning of energy suppliers and the major issues to prepare EERS in Korea.
Operation of Demand Bidding Program to Enhance Demand Response
Sohn, Yoon-Tae ; Lee, Ho-Seung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1575~1580
Demand Response is a well-known means usually operated by the system operator(SO) or the electricity retailers in order to reduce the peak loads or cut the price in electricity market. KPX(Korea Power eXchange), the SO in Korea has been operating the demand bidding program(or the demand resource market) since it was firstly introduced as the pilot project in 2008. The results has proved to be effective to enhance demand response. This paper describes the basic concepts and the operation results of the program.
Overview of Long-tern Electricity Demand Forecasting Mechanism for National Long-term Electricity Resource Planning
Kim, Wan-Soo ; Jeon, Byung-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1581~1586
Korea Power Exchange has successfully performed the Long-term Electricity Demand Forecasting. Recently there is a lot of change in electricity industry sector; the national master-plan for green gas emission reducing, rise of smart-grid, and new trend of electricity consumption, and it is becoming painful challenging for demand forecasting. In new circumstance the demand forecasting is required more flexible and more accurate.
A Study on Quantifying the Societal Benefits Attributed to IHD Deployments
Jung, Nam-Joon ; Yang, Il-Kwon ; Song, Jae-Ju ; Choi, Seong-Hwan ; Ko, Jong-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1587~1592
In this paper, the beneficial effects of IHD deployments on the society were investigated, which is one of the enabling technologies related to the AMI investments. By focusing on the energy use reduction due to the feedback information from IHD, various favorable effects can be induced and quantified. The societal benefits should make a reasonable contribution to ensure that IHD should be prerequisite to the AMI deployments. In future, the quantification methodology would be applied to characterize and estimate the time-varying rate based demand response programs.
Establishment of EMTP Modeling Method Using Searching Coil Test for HVDC Submarine Cables
Jung, Chae-Kyun ; Park, Hung-Sok ; Yang, Byeong-Mo ; Kang, Ji-Won ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1593~1599
This paper describes the EMTP modeling method using searching coil test for HVDC submarine cables. HVDC submarine cables consist of conductor, lead sheath and amore. It is different from general cable which is composed with just conductor and aluminium sheath. Therefore, the transient characteristics are totally different between HVDC submarine cable and general cable. However, the study on HVDC cable modeling and transient are insufficient. In this paper, EMTP modeling is performed according to grounding interval and grounding resistance, then they are compared with real test results by searching coil test.
Optimum Design of the Brushless Motor Considering Parameter Tolerance
Son, Byoung-Ook ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1600~1604
This paper presents the optimum design of the brushless motor to maximize the output power per weight considering the design parameter tolerance. The optimization is proceeded by commercial software that is adopted the scatter-search algorithm and the characteristic analysis is conducted by FEM. The stochastic optimum design results are compared with those of the deterministic optimization method. We can verify that the results of the stochastic optimization is superior than that of deterministic optimization.
Simulation and Experimental Analysis of Magnetic Levitation Relative Stability for the Flywheel Energy Storage
Park, Byeong-Cheol ; Jung, Se-Yong ; Han, Sang-Chul ; Lee, Jeong-Phil ; Han, Young-Hee ; Park, Byung-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1605~1610
In this paper, the relative stability of magnetic bearing system for the flywheel energy storage is evaluated using both simulation and experimental analysis. We make the simulation model for the magnetic bearing flywheel system using the rigid body shaft model. According to international standard ISO 14839-3, We experimentally analyzed the relative stability of magnetic bearing system. Additionally using both the simulation model and experimental tests, Phase margin and Gain margin is acquired through Nyquist plot.
Modeling and Simulation for Transient Pulse Gamma-ray Effects on Semiconductor Devices
Lee, Nam-Ho ; Lee, Seung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1611~1614
The explosion of a nuclear weapon radiates a gamma-ray in the form of a transient pulse. If the gamma-ray introduces to semiconductor devices, much Electron-Hole Pairs(EHPs) are generated in depletion region of the devices. as a consequence of that, high photocurrent is created and causes upset, latchup and burnout of semiconductor devices. This phenomenon is known for Transient Radiation Effects on Electronics(TREE), also called dose-rate effects. In this paper 3D structure of inverter and NAND gate device was designed and transient pulse gamma-ray was modeled. So simulation for transient radiation effect on inverter and NAND gate was accomplished and mechanism for upset and latchup was analyzed.
A Design of Thin Film Thermoelectric Cooler for Chip-on-Board(COB) Assembly
Yoo, Jung-Ho ; Lee, Hyun-Ju ; Kim, Nam-Jae ; Kim, Shi-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1615~1620
A thin film thermoelectric cooler for COB direct assembly was proposed and the COB cooler structure was modeled by electrical equivalent circuit by using SPICE model of thermoelectric devices. The embedded cooler attached between the die chip and metal plate can offer the possibility of thin film active cooling for the COB direct assembly. We proposed a driving method of TEC by using pulse width modulation technique. The optimum power to the TEC is simulated by using a SPICE model of thermoelectric device and passive components representing thermal resistance and capacitance. The measured and simulated results offer the possibility of thin film active cooling for the COB direct assembly.
Characteristics of CuO doped WO
Thick Film for Gas Sensors
Yu, Il ; Lee, Don-Kyu ; Shin, Deuck-Jin ; Yu, Yoon-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1621~1625
Recently, due to increase in the usage of toxic gas and inflammability gas, the ability to monitor and precisely measurement of these gases is crucial in preventing the occurrence of various accidents. CuO doped and undoped
thick films gas sensors were prepared using screen-printing method on alumina substrates. A structural properties of
:CuO thick films had monoclinic phase and triclinic phase of
together. Sensitivity of
:CuO sensor at 2000 ppm of
gas and 50 ppm of
gas was investigated. 4 wt% Cu doped
thick films had the highest sensitivity of
Current characteristics of Cu/NaCl electrolyte/Zn electrochemical cell
Kim, Yong-Hyuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1626~1631
The characteristics of electric current for the voltaic cell are important for electric power applications. In this paper, an electrical equivalent model consist of three resisters and a capacitance for the Cu/NaCl solution/Zn electrochemical cell is proposed. The capacitance which exists in the Zn electrode/electrolytic interface increased according to Zn electrode area, but cannot affect almost in electric current. Complex impedance plot was used to analysis the interface effect for Zn/electrolyte. This result shows that the interface is similar with the electric transmission line. The short current measurements were conducted to investigate the effects of hydrogen peroxide, the watery sulfuric acid and NaCl aqueous solution. As the hydrogen peroxide increased, the electric current increased because the hydrogen gas being converted with the water. Also electric current increased significantly with increase of the hydrogen ion with the watery sulfuric acid and increased with increase of
ion in the NaCl electrolyte.
Electrohydrodynamic Water Droplet Ejection Characteristics from a Micro-Water-Nozzle
Moon, Jae-Duk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1632~1637
A micro-water-nozzle, as one of a cooling means of micro-electronic devices, has been proposed and investigated. The I-V characteristics of the micro-water-nozzle and effect of applied voltage on the meniscus formation and deformation and ejection processes of de-ionized water on the micro-water-nozzle tip have been investigated. The water ejection processes, such as a drop formation, a drop deformation, a dripping, a cone jet, and an atomization, were taken place on the micro-water-nozzle tip by the electrohydrodynamic forces acted by the DC and AC high voltages applied on the meniscus of the micro-water-nozzle tip. The I-V characteristics of the micro-water-nozzle-to-plate electrode system were different from that of the same metal-point electrode system, due to the meniscus formation and water droplet ejection at the nozzle tip. The positive and negative DC and AC high voltages showed the water droplets ejection, the ejection rates of 1.8, 1.5 and 1.2 g/h respectively, which, however, showed that the proposed micro-water-nozzle-to-plate electrode system could be used as one of an effective pumping means.
Analysis of Electric field and Ion Characteristics on HVDC Overhead Transmission Line
Lim, Jae-Seop ; Shin, Koo-Yong ; Lee, Dong-Il ; Ju, Mun-No ; Yang, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1638~1643
HVDC is better economic method than HVAC in case of long distance transmission and it is possible to interconnect transmission lines regardless of difference of power frequency. The electrical environment problems of HVDC overhead transmission line are electric field, charged voltage, ion current and so on. For biopolar HVDC lines, most of the ions are directed toward the opposite polarity conductor, but a significant fraction is also directed toward the ground. These problems are major factor to design configuration of HVDC overhead transmission line. Therefore, It is necessary to test an environmental characteristics of HVDC overhead transmission line. In this paper, to assess the ion characteristic of HVDC transmission line, continuous measurements have been done on the biopolar single circuit line with ACSR 480mm2-6 bundle conductors of Gochang HVDC Test line. And then the ion characteristics were analyzed.
An Amendment of the VLF tanδ Criteria to Improve the Diagnostic Accuracy of the XLPE-insulated Power Cables
Lee, Jae-Bong ; Jung, Yeon-Ha ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1644~1651
diagnosis technology is introduced in IEEE Std 400 and proposed as evaluation criterion in an effective way of detecting water tree which mainly causes the failure of XLPE insulated cables. In order to inspect the accuracy of the VLF
method for XLPE insulated power cables in Korean distribution system, diagnosis for 41 cables which were being serviced in the fields has been carried out and they were removed for AC breakdown voltage test after. Regarding the 41 cables, it was hard to confirm any relation between the VLF
values and AC breakdown voltages and also water tree in the insulation was not detected. However, the other cables were failed several days after the diagnosis of the 41 cables. Water trees were found and their VLF
values were also much higher than the criterion of IEEE standard. It has been ascertained that we need to change the IEEE criteria in order to improve the accuracy of detecting water trees by additional analyzing of field examples of failure and case studies from overseas countries and therefore amended VLF
test voltage and evaluation criteria have been proposed.
Mode-Stirred Reverberation Chamber Characteristic to Stirrer Parameter and Usefulness Evaluation
Kim, Kwang-Yong ; Hong, Joo-Il ; Huh, Chang-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1652~1657
This paper analyzes optimal stirrer parameter to improve field uniformity in a mode-stirred reverberation chamber. Stirrer parameter is varied about stirrer height and stirrer angle. Also we analyze quality factor, number of excited modes and stirrer efficiency that affect field uniformity. The results show good performance as higher as stirrer height. Isotropic field distribution is formed at
stirrer angle. When stirrer angle varies, scattering characteristic of incident wave are changed. So electric field distribution in a mode-stirred reverberation chamber is also changed. Therefore, it affect field uniformity. The results expect to help that designs stirrer for get better field uniformity. Immunity test performed designed mode-stirred reverberation chamber for semiconductor that categorized by technology. Test result shows that good recurrence compared wave-guide immunity test.
An New Load Control Algorithms based on Power Consumption
Kim, Jeong-Uk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1658~1662
This paper presents an advanced energy saving algorithm in building. It is important to aggregate a various demand side resource which is surely controllable at the peak power time to reduce the energy cost. Previous demand side algorithm appropriate for building is based on peak power. In this paper, we develop the new energy saving algorithm to reduce the quantity of power consumption. The simulation results show that the proposed tem is very effective.
The Development of Feed-Water Flow Controller of Boiler Feed-Water Pump in 500MW Class Coal-Fired Power Plant
Lim, Geon-Pyo ; Choi, In-Kyu ; Park, Doo-Yong ; Jeong, Tae-Won ; Kim, Gun-Jung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1663~1672
The boiler feed-water pump controllers which can be applied to 500MW class coal fired power plants was developed. The validity of the developed controllers was shown via the applied test result in a power plant. It is expected that the developed controllers are used to retrofit the existing controllers that have surpassed their expected service life and have limited spare parts, and contributes to the stable operation of plants. Based on the collected data and analysis, new control schemes were developed and implemented during the overhaul period in the new control systems. During normal operation, feed water could be supplied to the boiler with the capability of the 1600t/h flow without any problems in automatic mode of controllers. In this study, the feed-water pump controllers were developed successfully. In addition, it is expected that the developed controllers can make the plant operation more stable and can be applied to a lot of power plants.
Ubiquitous Networking based Intelligent Monitoring and Fault Diagnosis Approach for Photovoltaic Generator Systems
Cho, Hyun-Cheol ; Sim, Kwang-Yeal ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1673~1679
A photovoltaic (PV) generator is significantly regarded as one important alternative of renewable energy systems recently. Fault detection and diagnosis of engineering dynamic systems is a fundamental issue to timely prevent unexpected damages in industry fields. This paper presents an intelligent monitoring approach and fault detection technique for PV generator systems by means of artificial neural network and statistical signal detection theory. We devise a multi-Fourier neural network model for representing dynamics of PV systems and apply a general likelihood ratio test (GLRT) approach for investigating our decision making algorithm in fault detection and diagnosis. We make use of a test-bed of ubiquitous sensor network (USN) based PV monitoring systems for testing our proposed fault detection methodology. Lastly, a real-time experiment is accomplished for demonstrating its reliability and practicability.
A Poof of Utkin's Theorem for a MI Uncertain Linear Case
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1680~1685
In this note, a proof of Utkin's theorem is presented for a MI(Multi Input) uncertain linear case. The invariance theorem with respect to the two transformation methods so called the two diagonalization methods are proved clearly and comparatively for MI uncertain linear systems. With respect to the sliding surface transformation and the control input transformation, the equation of the sliding mode i.e., the sliding surface is invariant. Both control inputs have the same gains. By means of the two transformation methods the same results can be obtained. Through an illustrative example and simulation study, the usefulness of the main results is verified.
Efficient Sweeping Algorithm for Multi-Security Mobile Robots
Shon, Woong-Hee ; Han, Chang-Soo ; Ji, Sang-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1686~1691
In this paper, we aim at providing a novel sweeping method for multi-security mobile robots. The sweeping problem of the multi-robots can be modeled as the stick pulling problem in which the swarm robots should sweep unknown terrains in order to remove sticks collaboratively. For the purpose, we define a certain map, what is called stick map. And we suggest how to make swarm robots build up and utilize the map in order to improve the productivity of collaborative removing sticks. Finally, the efficiency of our algorithm is verified with simulation experiments.
Location Estimation and Navigation of Mobile Robots using Wireless Sensor Network and Ultrasonic Sensors
Chun, Chang-Hee ; Park, Jong-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1692~1698
In this paper we use wireless sensor network and ultrasonic sensors to estimate local position of mobile robots, and to navigate it. Ultra sonic sensor is simple and accurate so it is good to use in local estimation and navigation of mobile robots. But to obtain accurate distance of two sensors they need to face each others as possible as they can. To solve this problem we rotate ultra sonic sensor which is attached to robot in 360 degrees and obtain accurate distance. We can estimate precise position of mobile robot by triangulation using obtained distance information. A mobile robot navigates using embedded encoder and compensates its coordinates by ultrasonic sensors. Results of Experiments show proposed method obtains accurate distance between sensors and coordinates of position of robot. And mobile robots can navigate designated path well.
Active Noise Cancelling Headphone using Adaptive Beam-forming Techniques
Moon, Sung-Kyu ; Nam, Hyun-Do ;
The Transactions of The Korean Institute of Electrical Engineers, volume 59, issue 9, 2010, Pages 1699~1701
The Active Noise Cancelling(ANC) headphone is now becoming commercially available. But it reduces not only noise but also information signals such as speech or some signals including audible information in particular situation. In this paper, we propose an ANC headphone using adaptive beam-forming techniques which cancels signals except the headphone wearer's look direction signal. It enables workers working in noisy condition to talk with their coworkers. Computer simulation is performed to show the effectiveness of a proposed algorithm.