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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 56, Issue 12 - Dec 2007
Volume 56, Issue 11 - Nov 2007
Volume 56, Issue 10 - Oct 2007
Volume 56, Issue 9 - Sep 2007
Volume 56, Issue 8 - Aug 2007
Volume 56, Issue 7 - Jul 2007
Volume 56, Issue 6 - Jun 2007
Volume 56, Issue 5 - May 2007
Volume 56, Issue 4 - Apr 2007
Volume 56, Issue 3 - Mar 2007
Volume 56, Issue 2 - Feb 2007
Volume 56, Issue 1 - Jan 2007
Selecting the target year
Optimal Setting of Overcurrent Relay in Distribution Systems Using Adaptive Evolutionary Algorithm
Jeong, Hee-Myung ; Lee, Hwa-Seok ; Park, June-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1521~1526
This paper presents the application of Adaptive Evolutionary Algorithm (AEA) to search an optimal setting of overcurrent relay coordination to protect ring distribution systems. The AEA takes the merits of both a genetic algorithm (GA) and an evolution strategy (ES) in an adaptive manner to use the global search capability of GA and the local search capability of ES. The overcurrent relay settings and coordination requirements are formulated into a set of constraint equations and an objective function is developed to manage the overcurrent relay settings by the Time Coordination Method. The domain of overcurrent relays coordination for the ring-fed distribution systems is a non-linear system with a lot of local optimum points and a highly constrained optimization problem. Thus conventional methods fail in searching for the global optimum. AEA is employed to search for the optimum relay settings with maximum satisfaction of coordination constraints. The simulation results show that the proposed method can optimize the overcurrent relay settings, reduce relay mis-coordinated operations, and find better optimal overcurrent relay settings than the present available methods.
Optimal Governor Response Power Flow with Nonlinear Interior Point Method
Kim, Tae-Gyun ; Lee, Byong-Joon ; Song, Hwa-Chang ; Cha, Jun-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1527~1534
This paper proposes a new concept of optimal governor-response power flow (OGPF) to obtain an optimal set of control parameters when the systems are in mid-term conditions after disturbances, ignoring the system dynamics. The idea of GOPF simply comes from the attempt to find an optimal solution of the governor-response power flow (GPF), which is a pre-exiting tool that is used to get power flow solutions that would exist several seconds after an event is applied. GPF incorporates the simplified model of governors in the systems into the power flow equations. This paper explains the concept of OGPF and depicts the OGPF formulation and application of a nonlinear interior point method as the solution technique. Also, this paper includes an example with New England 39-bus test system to illustrate the effectiveness of GOPF.
Estimation Methodology of Future Market Size for HTS Power Devices
Kim, Jong-Yul ; Lee, Seung-Ryul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1535~1542
HTS (High Temperature Superconducting) Power devices has the several useful characteristics from the technical and economical viewpoint. Possible application to the utility industry have been widely discussed in various research projects. For the successful introduction of HTS power devices into power system, establishing a proper R&D and marketing strategies through estimating the future market size are necessary. However, quantitative estimates of how well HTS power devices will serve their markets have been lacking. In this paper, we propose a estimation methodology of future market size for HTS power divices such as cable, transformer, generator, and motor, and also evaluate the future international and domestic market size by using proposed methodology.
The Site Selection of 100MVA STATCOM for Voltage Stability Enhancement in Korean Metropolitan Area
Chang, Byung-Hoon ; Kim, Soo-Yul ; Han, Jeong-Yeol ; Choi, Don-Keun ; Song, Hwa-Chang ; Lee, Byong-Joon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1543~1548
This paper reports a study on determination of the adequate location of 100 MVA STATCOM regarding the transfer capability enhancement on the metropolitan interface as well as the economy in system operation. The base case in the study was established considering a scenario of the energy support to North Korea from the KEPCO (Korea Electric Power Corporation) system through a HVDC interconnection. In the base case, the energy support was approximately modeled with a load of 1500 MW, and by the load addition, the system was weakened in terms of voltage stability and transfer capability. After a thorough investigation on the case, the location of the STATCOM was decided to compensate the reactive deficit of the modified system and to maximize the operational benefit which can be estimated by FV analysis.
Frequency Dependent Network Equivalent for Electromagnetic Transient Studies
Wang, Yong-Peel ; Jo, Keum-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1549~1555
The complexity of modern power systems often makes it impractical to model it in its entirety for electromagnetic transient studies. Therefore areas outside the immediate area of interest must be represented by some form of Frequency Dependent Network Equivalent (FDNE). The advantage of using z-domain fitting is that it can be directly implemented in a digital simulation program without any loss of accuracy. Fitting in the s-domain always requires "discretizing" a continuous system and the inherent approximations. This paper presents z-domain rational function formulation and demonstrates the use of it for the assessment of the transient response of the Lower South Island of New Zealand. Moreover by using a well publicized test system and providing complete information on the developed FDNE coefficients other researchers easily benchmark their work against this.
Development of Program for Substation Noise Prediction
Koo, Kyo-Sun ; Kweon, Dong-Jin ; Woo, Jung-Wook ; Kwak, Joo-Sik ; Kang, Yeon-Woog ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1556~1560
Energized power transformers in substations make unwelcome noises which propagate to nearby residential areas. As the excessive noise level become a target of public grievance than ever, utilities are seeking solutions to it. This paper introduce a power transformer noise prediction program which can give utilities effective solutions. Once a noise source is given, the program calculates the propagated noise level at certain points. The estimated result is rendered as noise contour map. To validate the accuracy of the program, the predicted noises are compared to measured one in real substations and proven to be acceptable within a margin of 5 percent.
Analysis of Produced By-products Due to Oil/Paper Degradation on Power Transformers
Kim, Jae-Hoon ; Han, Sang-Ok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1561~1565
According to thermal degradation on power transformers, it is known that electrical, mechanical and chemical characteristics for power transformer's oil-paper are changed. In the chemical property, especially, when the kraft paper is aged, the cellulose polymer chains break down into shorter lengths. It causes decrease in both tensile strength and degree of polymerization of paper insulation. Also the paper breakdown is accompanied by an increase in the content of various furanic compounds within the dielectric liquid. It is known that furanic components in transformer oil come only from the decomposition of insulating paper rather than from the oil itself. Therefore the analysis of furanic degradation products provides a complementary technique to dissolved gas analysis for monitoring transformers when we evaluate the aging of insulating paper by the total concentration of carbon monoxide and carbon dioxide dissolved in oil only. Recently, the analysis of furanic compounds by high performance liquid chromatography(HPLC) using IEC 61198 method for estimating degradation of paper insulation in power transformers has been used more conveniently for assessment of oil-paper. It is know that the main products which is produced by aging are 2-furfuryl alcohol, 2-furaldehyde(furfural), 2-furoic acid, 2-acetylfuran, 5-methyl-2-furaldehyde, and 5-hydroxymethyl-2-furaldehyde. For investigating the accelerated aging process of oil-paper samples we manufactured accelerating aging equipment and we estimated variation of insulations at
temp. during 500 hours. Typical transformer proportions of copper, silicon steel and iron have been added to oil-paper insulation during the aging process. The oil-paper insulation samples have been measured at intervals of 100 hours. Finally we have analyzed that 2-furoic acid and 2-acetylfuran products of furanic compounds were detected by HPLC, and their concentrations were increased with accelerated aging time.
A Study On The Arc Resistance of
Gas Circuit Breaker
Chong, Jin-Kyo ; Lee, Woo-Young ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1566~1570
] gas circuit breakers are widely used for short circuit current interruption in EHV(Extra High Voltage) or UHV(Ultra High Voltage) power systems. To develop
gas circuit breakers, the arc resistance value is necessary to compare experimental results to numerical ones. The arc resistance value can be obtained from a breaking test with a
gas circuit breaker. The direct testing or synthetic testing facility is widely used to verify the breaking ability for
gas circuit breakers. We employed the simplified synthetic testing facility to test a
gas circuit breaker prototype. The arc resistance characteristic was measured and calculated under the various experimental conditions. This arc resistance value can be used for verifying the numerical results from arc simulation in a circuit breakers.
A Study on Sinewave Air Gap Flux Density of Surface Type Magnet Motor
Kim, Hyun-Cheol ; Kim, Jang-Mok ; Kim, Cheul-U ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1571~1576
This report describes the analytical characteristic of sinewave air gap flux density for the brushless AC motor with surface permanent magnet. The analysis of sinewave air gap flux density is the key to expect the performance of back EMF for the design of brushless AC motor. The numerical analysis and FEM analysis are performed to adopt radial and parallel flux magnetization of magnet on the rotor. And it is also executed to vary the magnet arc angle and arc radius for the condition of constant and non constant air gap. This report is focused on the characteristic of sinewave air gap flux density for permanent magnet of surface brushless AC motor. This results also have more reliable data against the previous paper which had the representative numerical analysis of air gap flux density.
Increment of HTS Magnet's Central Magnetic Field Made of Pancake Windings by Using Separate Sources
Lee, Kwang-Youn ; Cha, Guee-Soo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1577~1583
The development of a magnet for very high magnetic field is usually envisioned with the use of an HTS insert coil. Pancake windings have been commonly used for the insert coil. All pancake windings have been connected in series and excited by a single power source. In that case, it is inevitable to operate some of the pancake windings well below their critical current densities. To increase the central magnetic field of the magnet, this paper proposed a new excitation method of the pancake windings by exciting the pancakes windings independently using multiple power sources. Results of the calculation show proposed method increases the central magnetic field of the magnet which consisted of 8 pancake windings by 17% comparing with excitation by using a single power source.
Dimming Control System for Multi-Fluorescent Lamp Using Chopper Technique
Jeon, Kyoung-Jun ; Lim, Byoung-Noh ; Park, Chong-Yeun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1584~1588
This paper proposed the voltage compulsion method that used chopper for light dimming control of fluorescent lamp. During the dimming period, electronic ballasts have the bad characteristics such as low power factor, high THD(Total Harmonic Distortion) and etc. The proposed dimmer improves power factor, THD of electronic ballast and has benefit such as low cost, simple build up.
A Study on the Advanced Reliability Assessment Method about Hot-Standby Sparing System for Railway Signaling
Min, Geun-Hong ; Lee, Jong-Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1589~1595
This paper suggests the advanced reliability assessment tool for railway signaling Hot-Standby sparing system. Existing reliability assessment for Hot-Standby sparing system controller is done by using single module mean failure rate based on approximated Hot standby sparing system function. Although approximated Hot standby sparing system function can be applied to various Hot standby sparing system, however, it is not able to reflect the exact system structure. In this paper, we suggest the advanced reliability function by identifying changeover-related failure factors and common failure mode which is not considered in existing approximated Hot standby sparing system reliability function via developing Hot standby sparing system model for railway signaling and applying FMECA to this model. Also. we compare reliability assessment results for model system to reliability assessment for existing system.
Structural, Optical and Electrical Properties of AI Doped ZnO Thin Films Prepared by Nd:YAG-PLD Technology
No, Im-Jun ; Lim, Jae-Sung ; Lee, Cheon ; Shin, Paik-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1596~1601
Aluminum doped zinc oxide (AZO) thin films were deposited on coming glass substrates using an Nd:YAG pulsed laser deposition technology. The AZO thin films were deposited with various growth conditions such as the substrate temperature and oxygen partial pressure. In this work, we used various measurement technologies in order to investigate the electrical, structural, and optical properties of the AZO thin films. Among the AZO thin films, the one prepared at the substrate temperature of
and oxygen partial pressure of 5 mTorr showed the best properties of an electrical resistivity of
, a carrier concentration of
, and a carrier mobility of
. All the AZO thin films showed an high average optical transmittance over 90 % in visible region.
Effects of Boride on Microstructure and Properties of the Electroconductive Ceramic Composites of Liquid-Phase-Sintered Silicon Carbide System
Shin, Yong-Deok ; Ju, Jin-Young ; Ko, Tae-Hun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1602~1608
The composites were fabricated, respectively, using 61[vol.%] SiC-39[vol.%]
and using 61[vol.%] SiC-39[vol.%]
powders with the liquid forming additives of 12[wt%]
by hot pressing annealing at
for 4 hours. Reactions between SiC and transition metal
were not observed in this microstructure. The result of phase analysis of composites by XRD revealed SiC(6H, 3C),
crystal phase on the Liquid-Phase-Sintered(LPS)
phase transformation was occurred on the
composite. The relative density, the flexural strength and Young's modulus showed the highest value of 98.57[%], 249.42[MPa] and 91.64[GPa] in
composite at room temperature respectively. The electrical resistivity showed the lowest value of
. The electrical resistivity of the
composite was all positive temperature coefficient resistance (PTCR) in the temperature ranges from
. The resistance temperature coefficient of composite showed the lowest value of
composite in the temperature ranges from
Compositional design and optimization of processing parameters are key factors for controlling and improving the properties of SiC-based electroconductive ceramic composites.
Dielectric Properties of
System Ferroelectric Thick Films Doped with
Noh, Hyun-Ji ; Yun, Sang-Eun ; Park, Sang-Man ; Ahn, Byeong-Lib ; Lee, Sung-Gap ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1609~1613
powders, which were prepared by sol-gel method using a solution of Ba-, Sr- and Ca-acetate and Ti iso-propoxide, were mixed with organic vehicle and the BSCT thick films were fabricated by the screen-printing techniques on high purity alumina substrates. The structural and dielectirc properties were investigated for various
doping contents. As a result of thermal analysis, the exothermic peak was observed at around
due to the formation of the polycrystalline perovskite phase. All BSCT thick films, sintered at
for 2h, showed the typical XRD patterns of perovskite polycrystalline structure and no pyrochlore phase was observed. The average grain size of the specimens decreased with increasing amount of
. The average grain size and thickness of the BSCT specimens doped with 0.1 mol%
, respectively. The relative dielectric constant decreased and dielectric loss increased with increasing amount of
, the values of the BSCT thick films doped with 0.1 mol%
were 3697 and 0.4% at 1 kHz, respectively. The leakage current densities in all BSCT thick films were less than
at the applied electric field range of 0-20 kV/cm.
The Research of FN Stress Property Degradation According to S-RCAT Structure
Lee, Dong-In ; Lee, Sung-Young ; Roh, Yong-Han ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1614~1618
We have demonstrated the experimental results to obtain the immunity of FN (Fowler Nordheim) stress for S-RCAT (Spherical-Recess Cell Array Transistor) which has been employed to meet the requirements of data retention time and propagation delay time for sub-100-nm mobile DRAM (Dynamic Random Access Memory). Despite of the same S-RCAT structure, the immunity of FN stress of S-RCAT depends on the process condition of gate oxidation. The S-RCAT using DPN (decoupled plasma nitridation) process showed the different degradation of device properties after FN stress. This paper gives the mechanism of FN-stress degradation of S-RCAT and introduces the improved process to suppress the FN-stress degradation of mobile DRAM.
A Study on the Relationships Between the Electrooptical Characteristics and Working Gas Xe+Ne+He
Park, Chung-Hoo ; Yoo, Su-Bok ; Lee, Hae-June ; Lee, Ho-Jun ; Kim, Jae-Sung ; Lee, Don-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1619~1625
The gas mixture ratio of PDP discharges plays a very important role in the discharge characteristics of a plasma display panel. The increase of Xe contents results in the increases of luminance and luminous efficiency while it also results in the increase of the breakdown voltage. The addition of He gas increases the brightness and the luminous efficiency. Especially, the luminance and the luminous efficiency have a maximum value when the partial pressure of He is about 10% of the total pressure for a standard plasma display panel with Xe fraction of
New Modeling Method for an Electrodeless Fluorescent Lamp Using the Relation of Lamp Output Power and the Modeling Coefficients of the Lamp
Lim, Byoung-Noh ; Jang, Mog-Soon ; Sin, Dong-Seok ; Park, Chong-Yeun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1626~1631
This paper presents a new modeling method using lamp output power and the modeling coefficients of the lamp. The proposed method utilizes the lamp modeling coefficients such as equivalent impedance Z(p), coupling coefficient of the transformer k(p), turns ratio of the transformer n(p), and plasma resistance Rp(p) as a function of lamp output power. The equivalent impedance Z(p) was developed from the equivalent resistance Req(p) and equivalent inductance Leq(p) of the lamp. Simulation and experimental results of the proposed model are presented in order to validate the proposed method. The modeling method can use to design an impedance matching circuit for a Class-D inverter.
Magnetic Field Reduction Characteristics of Hot-Line Worker's Shielding Wear for 765kV Double Circuit Transmission Line
Min, Suk-Won ; Park, Jun-Hyeong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1632~1637
This paper analyses current densities induced inside human body of lineman for 765kV transmission line when he wears a protective cloth or not. Applying the boundary element method, we calculate current densities induced in organs inside a worker in case he was located at 15[cm], 30[cm], 50[cm], and 100[cm] far from a prefabricated jumper. As results of study, we find a maximum current density induced in all organs may be higher than
if he does not wear protective clothes. We also know high permeability materials can lower current density more than high conductivity materials.+CZ21
The Destruction Effects of Semiconductors by High Power Electromagnetic Wave
Hwang, Sun-Mook ; Hong, Joo-Il ; Huh, Chang-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1638~1642
This paper investigated the destruction effect of the semiconductors by impact of high power electromagnetic wave. The experiments is employed as an open-ended waveguide to study the destruction effects on semiconductor using a 2.45 GHz 600 W Magnetron as a high power electromagnetic wave. The semiconductors are located at a distance of
from the open-ended waveguide and are composed of a LED drive circuit for visual discernment. Also the chip condition of semiconductor is observed by SEM(Scanning Electron Microscope) analysis. The semiconductor are damaged by high power electromagnetic wave at about 860 V/m. The SEM analysis of the destructed devices showed onchipwire and bondwire destructions. Based on the result, semiconductor devices should have plan to protect the semiconductor devices form high power electromagnetic wave. And the database from this experiment provides the basis for future investigation.
RF Detecting Circuit Analysis by Using BLT Equation
Hwang, Se-Hoon ; Park, Yoon-Mi ; Jung, Hyun-Kyo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1643~1647
Recently, there is a need for research concerning the technologies and precaution methods against electronic bomb assaults. There lays perplex constitution and much coupling phenomenon in this type of system, and thus requires much time and memory in order to translate the system with the existing translation methods. Applying the EMT (Electromagnetic Topology) would prove much more efficient. In this paper, EMT has been applied to the circuit-like micro system, previously employed in micro systems. Also, each section has been interpreted using the BLT (Baum, Liu, Tesche) equation using the EMT, then reconstructed, consequentially interpreting an entire system. In this paper, a simple circuit containing active and passive elements based on a CPW has been interpreted employing the BLT equation, and has been proven by experiment using the circuit simulation, a simulation officially recognized for its accuracy in interpreting small structures. The interpretation results have been presented by an S-parameter, and by comparing the interpretation results attained through the BLT equation and that from common simulation to that from experimentation, that the BLT equation turned out to be the most reliable interpretation method could be found.
] Control of Time-Delayed Linear Systems with Limited Actuator Capacities
Yi, Yearn-Gui ; Kim, Jin-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1648~1654
In this paper, we consider the design of
high-gain state feedback control for time-delayed linear systems with limited actuator capacities. The high-gain control means that the control permits the predetermined degree of saturation. Based on new Lyapunov-Krasovskii functional, we derive a result in the form of matrix inequalities. The matrix inequalities are consisted of LMIs those confirm the positive definiteness of Lyapunov- Krasovskii functional, satisfaction of predetermined degree of saturation, reachable set and
gain constraint. The result is dependent on the bound of time-delay and its rate, predetermined degree of saturation, actuator capacity, and the allowed size of disturbances. Finally, we give a numerical example to show the effectiveness and usefulness of our result.
Corrective Control of Asynchronous Sequential Machines with Input Disturbance I : Modeling
Yang, Jung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1655~1664
This paper presents the problem of controlling asynchronous sequential machines in the presence of input disturbances, which may be also regarded as an adversary in a game theoretic setting. The main objective is to develope a new methodology for including unpredictable behavior of input disturbance into models of asynchronous machines. The input disturbance, representing uncontrollable noise input, is embedded into a new model of asynchronous machines in form of input/state finite state machines. It is shown that the proposed modeling preserves the fundamental model and well-pose of asynchronous machines. The reachability matrix, an important performance index of asynchronous machines, is also adapted according to input disturbance and will be used for constructing corrective controllers in the companion paper.
Corrective Control of Asynchronous Sequential Machines with Input Disturbance II : Controller Design
Yang, Jung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1665~1675
This paper presents the problem of controlling asynchronous sequential machines in the presence of input disturbances, which may be also regarded as an adversary in a game theoretic setting. The main objective is to provide necessary and sufficient condition for the existence of a corrective controller that solves model matching problem of an asynchronous machine suffering from input disturbance. The existence condition can be stated in terms of a simple comparison of two skeleton matrices. The proposed controller eliminates the adversarial effect of input disturbance and makes the controlled machine mimic the behavior of a model in stable-state way. Whenever controller exists, algorithms for their design are outlined and demonstrated in a case study.
Design of Adaptive Disturbance Observer for the Time Delay System Control
Lee, Soon-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1676~1679
In control of the time delay systems, if the disturbance information can be estimated exactly, the ideal response for the disturbance can be achieved. Therefore, in this paper, a new adaptive disturbance observer for the time delay system control is proposed. The disturbance observer is designed and adaptive laws for adjusting the observer are proposed. The new Smith predictor controller to eliminate the effects of the disturbance can be achieved by adding an estimated disturbance to the Smith model. The improved performances of the proposed system and the adaptive disturbance observer are verified by computer simulation.
Development of HL7 V 2.5 Middleware for Patient Monitoring Device
Kim, Hyung-Hoi ; Cho, Hune ; Tran, Tung ; Hong, Hae-Sook ; Kim, Hwa-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1680~1687
A hospital room has multiple patient monitoring devices at the bedside to monitor his or her status. However, vital sign monitors, ventilator and other bedside devices are made by a variety of different manufacturers and often cannot easily interface to the hospital information system. Medical environments incorporate complex and integrated data networks to transfer vast amounts of patient information, such as images, waveforms, and other forms of digital data. Hence, to assure interoperability of images, waveforms and patient data, Health Level Seven (HL7) was developed as an international standard to facilitate the communicating and storing of medical data. In this study, we developed middleware capable of receiving data from mCare 300 vital signs monitoring devices and converting the data to HL7 data format. The HL 7 middleware streamline clinical workflow and support patients. Therefore, clinical expertise are empowered to respond to dynamic healthcare situation as soon as they emerged, and consequently quality of care while helping to reduce the length of a patient's stay in a hospital.
Development and Verification of the System for Heart Rate Detection During Exercise
Jeon, Young-Ju ; Shin, Seung-Chul ; Jang, Yong-Won ; Kim, Seung-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1688~1693
The aim of this paper is to develop and verify the system which can detect heart rate during exercise by using conductive fabric electrode and transportable measurement module. The experiment was performed under 4 conditions(resting, walking, jogging, running) and 18 subjects data are used. By using the ECG measurement system used in cardiac stress testing as reference value in order to verify the accuracy of the developed system, the relative error and correlation coefficient was calculated for each subject at every 3 seconds. The results have shown that the high correlation between the developed system and the reference system for detecting heart rate during exercise. Relative error and correlation coefficient are 2.27% and 0.9877, respectively. 7 subjects data are omitted in these calculations because of severe noises. Therefore, it is expected that this system could be used as a health monitoring system in ubiquitous environment in the future.
Fluorescece Microscope using Total Internal Reflection for Measuring Biochip
Bae, Soo-Jin ; Kang, Uk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 56, issue 9, 2007, Pages 1694~1698
This study suggests a new fluorescence microscope to observe micro-samples within fluorophore in a variety of biomedical fields including the fluorescence analysis of a biochip, such as a DNA micro-array. A fluorescence microscope is a device for irradiating light onto a micro-object, executing an excitation and fluorescence emission process. In this study, it adopts a total internal reflection fluorescence(TIRF) method to excite a whole micro-sample substrate different from an existing way which uses an evanescent wave resulting from a total internal reflection on the micro-sample surface. Suggested TIRF microscope can reduce optical noise and obtain images with higher sensitivity thus obtain precise information about the density, quantity, location, etc. of a flurophore, and can simultaneously process separate images even when plurality of fluorophores having different excitation and fluorescent wavelength ranges is distributed, thus easily obtain information about the fluorophores.