• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.8
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• pp.1813-1819
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• 2011

In this research, the location positioning system supposed is concerned with range recognition technology using phase and magnitude of radio wave and adding technology of image histogram by vision. By the proposed technology, we design the radio transmitter and receiver and realize the measurement system, and save the data in disk that is earned from 900Mhz RF signal, middle frequency 450Khz of analog signal. Range information is earned the data through digital signal processing of IF signal. For the estimation of range measured, we analyze the difference between real range and measurement range, and also suggest the method to improve the measurement error using average processing and amplitude properties.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.10
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• pp.1483-1489
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• 2022

Recently, due to the influence of the 4th industrial revolution and the development of communication media, various digital video equipment are being used in industrial fields. Image data is easily damaged by noise in the process of acquiring and transmitting and receiving from the camera and sensor, and since the damaged image has a great effect on the processing of the system, noise removal is essential. In this paper, a weight filter algorithm using a weight graph is proposed to restoration images damaged by high-density impulse noise. The proposed algorithm obtains a weight graph using pixel values inside the filtering mask of the image, and restores the image by applying the final weight to the filtering mask. Simulation was conducted to analyze the noise removal performance of the proposed algorithm, and the magnified image and PSNR were used to compare with the existing method. The resulting image of the proposed algorithm showed excellent performance by removing high-density impulse noise.

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.4
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• pp.338-344
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• 2010

A double rotation C-scanning system and a software program Under-Sodium MultiVIEW have been developed for the under-sodium viewing of a reactor core and in-vessel structures of a sodium-cooled fast reactor KALIMER-600. Double rotation C-scanning system has been designed and manufactured by the reproduction of double rotation plug of a reactor head in KALIMER-600. Hardware system which consists of a double rotating scanner, ultrasonic waveguide sensors, a high power ultrasonic pulser-receiver, a scanner driving module and a multi channel A/D board have been constructed. The functions of scanner control, image mapping and signal processing of Under-Sodium MultiVIEW program have been implemented by using a LabVIEW graphical programming language. The performance of Under-Sodium MultiVIEW program was verified by a double rotation C-scanning test in water.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12A
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• pp.1024-1033
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• 2011

Stereoscopic video for 3DTV service is emerging as a main content of the Post-HD age in the multimedia industry, and also it starts a ripple effect to build infrastructure for 3DTV service throughout the related industries such as creating contents, consumer electronics and the broadcasting. Thus, "Technical Specification of Stereoscopic Video over MPEG-2 TS for 3DTV Service" for providing a standard for 3DTV broadcasting transmitter and receiver interface is under development by the 3DTV WG8061 in ITA, Korea. This paper provides verification of the functionalities, problems and future work of the above specification with designed test-bed. Through making a test bed, this paper try to verify not only the functionality of standard but also backward compatible for the present technology and abstract problems to would be reviewed and supplemented.

• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.237-242
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• 2018

There are various 'wireless communication technologies' around us. Wireless mobile communication has evolved through various stages, and its utilization is also diverse. However, due to the development of wireless communication technology, the demand for frequency resources is much higher than the supply, so frequency shortage is serious. Recently, 'visible light communication' has been attracting attention as an emerging communication technology that can solve the frequency shortage. 'Visible light communication' is a communication method based on serial data transmission / reception, and there is a difficulty in transmitting / receiving parallel data because the transmitter and the receiver are arbitrarily present. In this paper, we have studied parallel data processing of visible light communication. We could solve the problem by analyzing parallel data using image processing. Through this study, communication performance can be verified through I / O data comparison by implementing parallel data analysis method. It is expected that diversity in parallel data analysis will be presented through the results.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.6
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• pp.573-582
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• 2010

In this paper, X-band transceiver for high resolution wideband SAR systems is designed and fabricated. Also as a technique for enhancing the performance, error compensation algorithm is presented. The transceiver for SAR system is composed of transmitter, receiver, switch matrix and frequency generator. The receiver especially has 2 channel mono-pulse structure for ground moving target indication. The transceiver is able to provide the deramping signal for high resolution mode and select the receive bandwidth for receiving according to the operation mode. The transceiver had over 300 MHz bandwidth in X-band and 13.3 dBm output power which is appropriate to drive the T/R module. The receiver gain and noise figure was 39 dB and 3.96 dB respectively. The receive dynamic range was 30 dB and amplitude imbalance and phase imbalance of I/Q channel was ${\pm}$0.38 dBm and ${\pm}$3.47 degree respectively. The transceiver meets the required electrical performances through the individual tests. This paper shows the pulse error term depending on SAR performance was analyzed and range IRF was enhanced by applying the compensation technique.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.375-377
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• 2016

리포터의 짧은 현장 중계를 위해 중계차와 MNG 등 기존 중계시스템을 동원하는 것은 많은 시간과 비용을 요구한다. 최근 스마트폰의 연산 능력, 카메라의 화질, 모바일 데이터 네트워크의 속도, 그리고 스마트폰과 네트워크의 안정성이 비약적으로 발전함에 따라 스마트폰을 이용한 간단한 현장 중계 방송이 가능하게 되었다. 본 논문에서는 이를 위한 스마트폰 애플리케이션, 스튜디오에 위치한 관리서버와 송수신시스템, 스마트폰 영상과 스튜디오 영상의 실시간 부/복호화 모듈, RTP를 이용한 전송 모듈 등의 개발에 대해 기술하고, 개발 중인 시스템을 KBS의 '보이는 라디오' 실시간 중계방송에 활용한 사례에 대해 소개한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.101-103
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• 2013

최근 HD (High Definition) 또는 3D (Three Dimension) 이상의 고품질 방송 콘텐츠 수요가 증가하면서 디지털 방송 시스템은 실시간으로 실감형 서비스를 제공하기 위하여 발전 하였다. 특히, 세계 방송 비영리 협회 FoBTV (Future of Broadcast Television) 는 더 나아가 초 고해상도 UHD (Ultra High Definition) 급 이상의 영상을 제공하기 위해 지상파 방송과 유선 케이블 방송 시스템을 이용하여 고품질, 다시점 방송 서비스 뿐 아니라 낮은 전계 강도 환경에서 수신율을 높일 수 있는 기술방안을 논의하고 있다. 본 논문은 이와 같은 세계 방송 발전 흐름에 따라 지상파 및 케이블 방송 송수신 시스템을 구현하고 수신되는 영상의 품질을 평가하였다. 또한, 구현된 통합 시스템은 지상파로 수신되는 파일럿 신호의 크기를 분석하여 케이블로 재전송 되며 이를 통해 수신 성능의 품질을 향상시킨다.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.183-186
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• 2012

최근 IT기술의 급속한 성장으로 교육에 IT기술을 적용하여 교육의 효율성으로 높이려는 시도가 활발히 진행되고 있다. 이러한 시도는 스마트 교육이라는 새로운 학문 분야를 만들었으며, 상호작용기반 멀티미디어 교육은 스마트 교육에서 가장 중요한 부분 중 하나로 인식되고 있다. 본 논문에서는 스마트 교육의 효율성을 높이기 위한 스크린 공유기반 양방향 교육시스템을 제안하며, 시스템은 고속 영상처리부, 다자간 영상송수신처리시스템, 전용 H/W로 구성된다. 제안하는 시스템은 전용 H/W로 인해 추가적인 비용을 요구하지만, 원활한 수업 진행이 어려운 기존 S/W기반 시스템에 비해 실시간 수업 진행이 가능하다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.118-119
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• 2017

스마트폰 기반의 모바일 플랫폼이 발달하면서 관련 서비스에 대한 수요가 급증하고 시공간의 제한 없이 누구든지 방송 콘텐츠를 제작 및 송수신 가능하게 되었다. 이에 본 논문에서는 학회 또는 세미나와 같은 컨퍼런스에서도 모바일 기반의 스트리밍 플랫폼 서비스를 제공하고자 웹캠을 통해 영상을 획득하고, 획득한 영상을 사용자 개인의 모바일 어플리케이션을 통해 실시간 스트리밍 시청 및 VOD 서비스를 제공하는 시스템을 개발하였다. 실시간 스트리밍 시청, VOD 서비스 등 다양한 기능을 탑재함으로써 기존의 컨퍼런스 관련 모바일 어플리케이션보다 더 많은 정보 제공 및 사용자 편의성 향상이 가능하다. 이 시스템을 제공함으로써 사용자는 컨퍼런스 발표 현장에 있지 않더라도 개인 모바일 어플리케이션을 통해 정보를 보다 쉽게 제공받을 수 있을 것으로 기대된다.