• Journal of Electrical Engineering and Technology
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• 제13권6호
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• pp.2212-2219
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• 2018

This paper describes extended fault location algorithm using estimated remote source impedance. The method uses data only at the local end and the sequence current distribution factors for more accurate estimation. The proposed algorithm can respond to variation of the local and remote source impedance. Therefore, this method is especially useful for transmission lines interconnected to a wind farm that the source impedance varies continuously. The proposed algorithm is very insensitive to the variation in fault distance and fault resistance. The simulation results have shown the accuracy and effectiveness of the proposed algorithm.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.676-678
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• 2003

Recently, in according as rapid improvement of telecommunication markets and wireless internet technology, Location- Based Services (LBS) have been discussed as new 'Killer' application. The purpose of LBS is to determine location of user through mobile handset and to offer location information service to end-user. This paper has suggested an efficient transmission scheme of maps data as one of the important content services relating to data transmission of LBS in mobile environment. The basic system consists of three parts : (1) GIS (Geographic Information System) Server for storing, processing and handling map data, (2) Middleware Server for transmitting of map data by request of client, and (3) Client for requesting map data to Server and displaying them on handset. Also, in order to transmit map data, we are to expand WKB (Well Known Binary) in conformance to Simple Feature Specification of OGC (Open GIS Consortium), and increase efficiency of data transmission by developing trans mission data format to be able to transmit lightweight data and considering data compression technology.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.743-746
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• 1998

In this paper, we developed an outdoor augmented reality system which has remote real scences acquisition ability. The real scenes acquisition system consists of image acquisition system, tracking system, wireless data transceiver and power supply. Tracking system that consists of Tans Vector and RT-20 measures a position and attitude of the CCD camera that attached at the remote control helicopter. Wireless data transceiver system is utilized for data transmission of remote system that of attitude, position information, andreal scenes data that acquired by the CCD camera. Maximum propelling power of remote control helicopter is 15Kg, so we used 7.2V li-ion cell as a power supply for system minimize. As the results of experiment, the developing system presented application possibility of remote information acquisition system such as construction simulation & estimation, broadcasting, tour guide.

• 대한의용생체공학회:의공학회지
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• 제13권1호
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• pp.69-78
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• 1992

This Paper describes implementation of a remote ECG diagnostic system using telephone line. The overall system includes ECG data acquisition system, ECG terminal, system control software, automatic diagnosis system, and transmission system.'The proposed system provides various functions, which are ECG data acquisition, transmission, receiving, diagnosis and dialogue between patients and medical doctors. Thls system is very simple and convienient to use. We evaluate the performance of modem and the accuracy of automatic diagnosis algorithm. The obtained results suggest the Possibilities of a remote ECG diagnostic system using the only existed telephone line.

• 대한원격탐사학회지
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• 제15권3호
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• pp.209-216
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• 1999

독자기술에 의한 소형위성 개발이라는 목표아래 지난 4년 반에 걸쳐서 개발된 우리별 3호가 성공적으로 발사되었다. 초기운용 기간동안 위성의 각 서브시스템에 대한 시험이 있었으며 모든 서브시스템에 대한 시험이 있었으며 모든 서브시스템이 설계된 바와 같이 정상적으로 동작함을 검증할 수 있었다. 이 기간동안 우리별 3호에 탑재된 카메라가 수십회 지구를 촬영하여 그 데이터를 지상으로 송신하고 수신된 영상데이터를 분석하여 카메라 및 송수신 시스템의 성능을 분석할 수 있었다. 본 논문에서는 우리별 3호의 다대역 지구관측 센서 영상의 촬영, 데이터 송신, 수신 및 저장시스템을 소개하고 위성 초기운용 시 시험했던 영상데이터 송수신 시스템의 성능을 기술한다. 수신시스템은 개발 시 주어졌던 1% 미만의 전송에러를 만족하였으며 앞으로 지속적인 시스템 시험 및 안정화를 통해서 이러한 수신시스템의 에러율은 최소화 될 것이다.

• 한국콘텐츠학회논문지
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• 제10권6호
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• pp.106-114
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• 2010

최근 네트워크 기술의 발달과 함께, 시공간에 제약을 받지 않는 웹기반 원격제어 시스템들과 실시간 원격 제어 시스템들이 산업 여러 공장자동화 분야에서 많이 개발되고 있다. 본 논문에서는 철강업 분야의 공장자동화를 위하여, 우리는 무선망을 내장한 클라이언트 PC(PDA)의 그래픽 에디터 화면과 산업현장의 서버에 접속하여 데이터의 전송을 제어할 수 있는 실시간 원격제어 시스템을 구현하였다. 본 시스템의 구축은 산업현장의 관리적인 측면에서 작업자의 이동 감소, 신속한 설비제어, 생산 효율성 증대, 유지보수 비용 감소 등의 여러 가지 효과를 가져왔다.

• 수산해양교육연구
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• 제12권2호
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• pp.176-190
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• 2000

CATV 네트워크의 여유 주파수 대역을 이용한 데이터 통신망의 실용화로 보다 양질의 통신망 구축이 가능하게 되었으며, 이러한 환경을 이용하여 중등학교에서는 멀티미디어 원격교육에 대한 다양한 방안을 찾고 있다 일반적으로 CATV 네트워크의 전송속도는 256Kbps~100Mbps로서 멀티미디어 콘텐츠는 물론 대용량 멀티미디어 데이터를 이용한 원격학습과 양질의 실시간 원격교육까지 가능하다. 본 논문에서는 CATV 데이터망을 이용한 멀티미디어 데이터의 전송능력을 분석하여 보다 양질의 멀티미디어 데이터를 전송함으로서 효율적인 원격교육 방법의 새로운 모델을 설계하고, 구체적인 적용 방법을 제시 하고자 한다.

• 한국멀티미디어학회논문지
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• 제18권9호
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• pp.1047-1057
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• 2015

In this paper, we propose an effective wireless transmission technology, under poor wireless transmission channel surroundings caused by speedy flying, that are able to transmit high quality video recording information and surveillance data via accessing to various wireless networking services architecture such as One-on-One, Many-on-One, One-on-Many, Over the Horizon. The Real-Time Position Analysis(RAPA) method is also suggested to provide more meaningful video information of shooting area. The suggested wireless transmission technology and RAPA can make remote control of UAV's flight route to get valuable topography information. Because of the benefit to get both of video information and GPS data of shooting area simultaneously, the result of study can be applied to various application sphere including UAV that requires high speed wireless transmission.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.456-456
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• 2004

• 한국멀티미디어학회논문지
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• 제19권12호
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• pp.1981-1991
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• 2016

In recent, the advancement of wearable devices and wireless body area networking technologies motivate researchers to pay attention to remote healthcare system for monitoring patients health and disease progression effectively. However, in order to implement a practical remote healthcare system, we must consider the security and privacy of patient's personal health information transmitted to healthcare servers through the network. Hence, in this paper, we propose a secure health data transmission protocol in remote healthcare monitoring system to protect patient's health information and prevent privacy from eavesdropping on the network. To achieve our security goals, we design an efficient secure protocol based on the identity-based cryptography with key evolution technique, and then confirm the superiority and the efficiency of the proposed protocol as compared with the existing protocol of Yang et al.