• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.3016-3018
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• 2000

생명체는 자신을 이루고 있는 단순한 구성요소들이 적은 수의 근본 규칙들에 의하여 국부적 상호작용을 함으로써 복잡한 생명 현상을 보이고있다. 이 연구에서는 생명 현상을 보이고 있는 개체가 많은 수의 단순한 구성 요소들의 집합으로 이루어져 있으며 그러한 구성 요소들이 적은 수의 근본 규칙들에 의하여 서로 국부적인 상호작용을 함으로써 복잡한 행동패턴들을 나타낸다는 가정 아래, 여러 대의 자율이동로봇 (autonomous mobile robot)들의 군지능을 나타낼 수 있는 적은 수의 근본 규칙을 찾아내고 찾아진 근본규칙들을 퍼지규칙으로 표현하는 것을 목표로 한다. 각 자율 이동로봇은 기능이 매우 제한되어 있으며. 자신만의 독특한 신호를 발생한다 이신호를 "heartbeat"이라 부르며 이를 이용하여 대략적으로 자신의 위치와 현재상태를 다른 개체에게 알리는 역할을 한다. 이 논문에서는 "heartbeat"을 이용한 로봇간의 통신과 자재반송이라는 군행동을 퍼지시스템으로 구현하고 이를 평가한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2419-2422
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• 2000

A distributed real-time system that is being used now is usually divided into three level : higher level, middle level, and lower level. The higher level network is usually called an information network, the middle level is called a control network, and the lower level is called a field network or a divice network. This dissertation suggests and implements a middle level network which is called PICNET-NP (Plant Implementation and Control Network for Nuclear Power Plant). PICNET-NP is based partly on IEEE 802.4 token-passing bus access methed and partly on IEEE 802.3 physical layer. For this purpose a new interface, a physical layer service translater, is introduced. A control network using this method is implemented and applied to a distributed real-time system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1368-1370
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• 2000

The automotive environment presents to the FMCW radar sensor a multitude of moving and fixed targets and the sensor must detect and track only the targets which may pose a threat of collision or passengers accident. The sensor must function accurately in the presence of background echoes generated by moving and fixed targets, ground reflections, atmospheric noises, including rains, fog, and, snow and noise generated within the receiver. False detection of the desired target in this environment may issue false alarms. That may be dangerous to the passenger and the vehicle. A high false alarm rate is totally unacceptable. The false alarm mechanism consists of noise peaks, crossing the threshold and the undesired response of the system to off lane targets which are not potentially hazardous to the radar equipped vehicle. This paper presents an improve technique safety performance for driver-less operation using FMCW radar sensors.

• 전기전자학회논문지
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• 제20권3호
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• pp.333-336
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• 2016

차량 내 전자장치에서 효과적인 서브 버스로서 표준화된 저속 직렬 통신 프로토콜인 LIN(local interconnect network)이 개발되었다. 본 논문에서는 LIN 버전 2.2A를 기반으로 LIN 제어기를 Verilog HDL을 이용하여 구현하였다. 구현된 LIN 제어기는 FPGA에서 동작을 확인하였으며 IP 형태로 제공되어 SoC 시스템에 통합이 가능하다. 0.18um 공정에서 합성하였을 때의 게이트 수는 약 2,300 게이트이다.

• 대한전기학회논문지:전력기술부문A
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• 제48권3호
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• pp.330-335
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• 1999

Recently, there a lot of activities on the researches that implement many kinds of control system using power lines. To implement that, it is desirable to use hybrid PSK model because it takes advantage of PSK and DPSK which has a low-bit-error rate. In this parer, we implement the transmitter of this model. Because the power line is not designed for the data communication, we separated the signal generator circuit and the signal loading circuit so that minimized noises from outside. Also, to make it easy on the experiments, most of process are performed by software. As a result, transmitting a high frequency signal on the power line made no effects on the electrical devices.

• 대한전기학회논문지:전력기술부문A
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• 제48권3호
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• pp.336-341
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• 1999

Up today, nationally published research results on the methods used in HA modems have studied and shown the major methods; the ASK method and the DS/SS method. In this paper, we applied the DPSK reception method on the PSK method so that solved the acquisition and tracking problem of the signal synchronization which is the defect of PSK. Also, it has been designed to fit in the CISRP and CENELEC specification so that make sure of no effects on other part of the system.

• 대한전기학회논문지:전력기술부문A
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• 제48권4호
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• pp.467-473
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• 1999

We have realized the two kinds of power line communication systems by the FSK MODEM. The first approach is the DS-SS (Direct suquence-spread spectrum) technique using 8 bits pseudo noise, the other is Convolutional coding method by the new algorithm. Their characteristics are comparied with each other by experimenting their Bit Error Rates (BER) in high level of Noise. The results have showed that two systems are useful to the application of HA (Home Automation) systems.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권6호
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• pp.279-285
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• 2006

Power line communication channels are very complicated and models for communication channels vary with the types of electrical equipment, devices and load fluctuations. So, modeling and analysis of power line channels for implementation of power line communication systems is a very important process. Power line channel modeling and simulation are performed based on power system transient simulation models and power system CAD tools to create precise and accurate models. In this paper, a channel modeling and simulation method is proposed for power line communication systems using PSCAD/EMTDC, in which a PN 63 sequence code generator is applied for impulse response of the power line channel in the simulation model.

• 대한전기학회논문지:전력기술부문A
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• 제52권9호
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• pp.506-512
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• 2003

In this paper, a communication module between Relay agents in a multi-agent system based power distribution network protection system is realized using DNP3.0(Distributed Network Protocol), which is the standard communication protocol of distribution automation system in KEPCO. The key words for agent communication in the multi-agent based protection system are defined and represented by use of DNP application function code. The communication module developed based on the proposed communication scheme is tested by use of the Communication Test Harness, a test tool for DNP protocol, then used to the multi-agent system based power distribution net work protection system.

• 조명전기설비학회논문지
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• 제12권1호
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• pp.69-77
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• 1998

무정전전원장치는 중요설비에 안정된 전원을 공급하는 기기로서 컴퓨터, 통신시스템 등에 필수적인 장치가 되었으며 최근에는 고주파스위칭 기술의 발전으로 여러 가지 제어방식이 제안되고 있다. 본 논문은 3상 무정전전원장치의 PWM 인버터를 DSP로 제어하고 PI제어기의 피드 포워드항을 부하전류 예측기법에서 예측된 부하전류의 함수로 둠으로써 비선형부하에 대해서도 출력전압의 왜형률을 저감시킬 수 있는 방법을 제시한다. 시뮬레이션과 실험을 통하여 제안된 제어방법의 타당성을 입증하였다.