• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
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• pp.115.3-115
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• 1998

• 전기학회논문지
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• 제64권1호
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• pp.1-7
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• 2015

This paper proposes probabilistic reliability evaluation model of power system considering Wind Turbine Generator(WTG) integrated with Energy Storage System(ESS). Monte carlo sample state duration simulation method is used for the evaluation. Because the power output from WTG units usually fluctuates randomly, the power cannot be counted on to continuously satisfy the system load. Although the power output at any time is not controllable, the power output can be utilized by ESS. The ESS may make to smooth the fluctuation of the WTG power output. The detail process of power system reliability evaluation considering ESS cooperated WTG is presented using case study of Jeju island power system in the paper.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권3호
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• pp.91-95
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• 2004

The pulsed power system is widely available for use in pulse generator applications. Generally, the pulse generator is required for very short pulse width and high peak value. We have designed and fabricated our own pulsed type power system and through its use, we investigated microbe removal characteristics. This paper introduces a simple pulsed power system for removing various microbes caused by dirty water. This system includes a 2 times power supply circuit, IR2110 operated by using a fixed voltage regulator 7812 and 7805, and the switching MOSFET (Metal Oxide Semiconductor Field Effect Transistor). We can also control this process by using a PIC one chip microprocessor. As a result, we can obtain good removing characteristics of various microbes by adjusting the charging voltage, the pulse repetition rate and the electrical field inducing time.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.390-398
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• 2014

The systematic optimal tuning of power system stabilizers (PSSs) using the dynamic embedded optimization (DEO) technique is described in this paper. A hybrid system model which has the differential-algebraic-impulsive-switched (DAIS) structure is used as a tool for the DEO of PSSs. Two numerical optimization methods, which are the steepest descent and Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithms, are investigated to implement the DEO using the hybrid system model. As well as the gain and time constant of phase lead compensator, the output limits of PSSs with non-smooth nonlinearities are considered as the parameters to be optimized by the DEO. The simulation results show the effectiveness and robustness of the PSSs tuned by the proposed DEO technique on the IEEE 39 bus New England system to mitigate system damping.

• 센서학회지
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• 제10권4호
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• pp.239-249
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• 2001

본 논문은 pH감도와 교류 광전류의 바이어스 포텐셜 의존성을 이용한 다채널 센서인 LAPS의 실제 제작과, 동기 검파 및 다중화 방법을 이용하여 제작된 센서의 신호를 효과적으로 측정하기 위한 시스템 구현에 관한 것이다. 제작된 LAPS소자는 여러 종류의 물질을 동시에 측정하기 위하여 다채널 감지면으로 구성하였으며, 제작된 소자에 적합한 측정 시스템은 높은 S/N를 유지하면서 다채널 pH농도 측정이 가능하도록 하나의 전치 증폭단을 이용한 시분할 측정과 이에 적합한 제어 시스템을 포함한다. 전체 시스템 하드웨어는 전치 증폭부, 디지털 및 센서부로 구성되었으며, 소프트웨어는 디지털 제어용 시스템 프로그램과 PC프로그램으로 구성된다. 구현된 시스템의 성능을 평가한 결과 양호한 감도, 선형성으로 LAPS에 의한 다채널 측정이 가능함을 보였다.

• Journal of Power Electronics
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• 제18권3호
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• pp.931-943
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• 2018

Wireless power transfer (WPT) technology has been the focus of a lot of research due to its safety and convenience. The Z-source inverter (ZSI) was introduced into WPT systems to realize improved system performance. The ZSI regulates the dc-rail voltage in WPT systems without front-end converters and makes the inverter bridge immune to shoot-through states. However, when the WPT system is combined with a ZSI, the system parameters must be configured to prevent the ZSI from entering an "accidental shoot-through" (AST) state. This state can increase the THD and decrease system power and efficiency. This paper presents a mathematical analysis for the characteristics of a WPT system and a ZSI while addressing the causes of the AST state. To deal with this issue, the impact of the system parameters on the output are analyzed under two control algorithms and the primary compensation capacitance range is derived in detail. To validate the analysis, both simulations and experiments are carried out and the obtained results are presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2807-2808
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• 2003

말초 신경계에서 손상된 신경은 그 손상된 정도에 따라 재생의 정도가 달라진다. 이러한 신경 재생의 정도를 확인할 수 있는 방법으로 초미세 전극 어레이 기술이 연구되고 있는데 이것은 전기신호경로(via hole)를 초미세 전극어레이를 제작하여, 손상된 신경의 근위부(proximal stump)와 원위부(distal stump) 사이에 직접 삽입하여 선경으로부터 재생되어온 신경 섬유의 전기적 전도 선호를 측정 및 기록하는 것이다. 이는 신경 재생을 관찰하는 방법으로서 신경보철(neural prostheses) 기술에 이용된다. 따라서, 본 논문에서는 손상된 신경의 재생을 관찰하기 위한 implantable microelectrode array system을 설계하고, 원 신호인 선경 전도 신호의 특성과 제작된 이식형 초미세전극(implantable microelectrode)의 특성을 고찰하며, 동물 실험을 통하여 그 성능을 검증하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.468-468
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• 2000

In our laboratory, the control aspects are investigated in the photovoltaic power generation systems (PV systems). The PV system is very good for earth environment, but if it connects to power network system, many problems are raised (protection, voltage, harmonics etc.). In this paper, we present the result of the basic studies for the building of the PV system that amplifies the electric energy obtained from the solar cell. We consider electronic circuits in order to protect the PV system from power surge induced by lightning and also design an electronic circuit in order to detect defaults in the power network system. We would like to integrate these circuits into the PV system by considering its control equipment build by 8-bit microcomputer using various control theory (fuzzy, neural network etc.).

• 한국산업융합학회 논문집
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• 제22권1호
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• pp.21-28
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• 2019

As the automated vehicle system evolves, electronic devices and control software installed in vehicles are increasing. Therefore, automated vehicle electrical and electronic system (E/E system) design for ensure system integration, software modularization, system reusability, and scalability at the design stage of the automated vehicle is actively studied. This paper introduces a design methodology for automated vehicle E/E systems that employs by using cyber-physical systems (CPS). An automated forklift system was designed to examine the effectiveness of the proposed methodology. This paper showed that the proposed CPS design methodology enables an effective development of automated E/E control systems. Compare to existing design methodologies, it provides higher reusability of individual modules and an easier way to integrate control system elements such as controllers, sensors, and actuators.

• 제어로봇시스템학회논문지
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• 제7권10호
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• pp.837-842
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• 2001

In this paper, we design and implement the DC characteristic measurement system for semiconductor devices. The proposed system is composed of 4 SMU(Source and Measure Unit) channels. Various efforts in hardware and software have been made to reduce the measurement errors. Internal and external sources of errors in measurement system especially in pA range measurement have been identified and removed. Also, various digital signal processing techniques are developed. Calibration is executed under the control of microprocessor periodically. Experimental results show that the implemented system can measure the DC characteristic of semiconductor devices with less than 0.2% error in various voltage and current source/measurement range.