• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.1
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• pp.33-40
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• 2003

Radio frequency management system(RFMS) is being operated to facilitate national spectrum management and monitoring in Korea. To improve the engineering analysis function in RFMS, criteria for the automated selection of the propagation model adequate to the radio station service environment considered are proposed. Those criteria are derived from the specified parameters obtained through the analysis of related ITU-R propagation & diffraction loss models which are to be used in RFMS. Then, using criteria acquired, computer program is made to achieve the automated selection of the most appropriate propagation algorithm, among the ones provided in RFMS, to the environment in which the engineering analysis is required. Furthermore, an illustrative example is shown with the proposals fur increasing the efficiency of the engineering analysis in RFMS.

• Journal of IKEEE
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• v.7 no.2 s.13
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• pp.281-287
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• 2003

This paper proposed an improvement scheme for effective usage of radio-frequency management system(RFMS), which has been operated to facilitate national spectrum management and monitoring in Korea. Based on the wave propagation models, interference analysis algorithms, and sharing criteria recommended by ITU-R, we derived criteria for the automated selection of the channel interference analysis algorithms and sharing conditions adequate to the environment to be analysed. Then using the obtained criteria, computer and program has been made and shown to select the most appropriate propagation models, interference analysis algorithms, and sharing criteria from the ones provided in RFMS, with the illustrative example.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.332-335
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• 2002

본 연구에서는 ITU-R 권고안들을 근거로 하여, 입력파라미터의 일부로서 사용자가 입력하게 되는 전파 분석을 수행하고자 하는 위치좌표와 사용 주파수 대역, 적용 업무 파라미터를 활용하여 전파전파 분석모델이 자동 선택되어 전파 분석을 수행할 수 있도록 기준을 마련함으로써, 복합적인 실 전파 환경에서의 전파분석시스템(RFMS)의 활용도를 높이는 방안을 제시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.358-360
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• 2005

현재 RFID 네트워크의 구조적 기준이 되는 EPC Network는 HTTP/SOAP 통신 프로토콜과 HTML/XML를 이용하여 서비스를 제공하지만, 이동 RFID 네트워크에서는 핸드폰의 메모리 배터리가 가지는 제약성과 대역폭이 작은 무선 환경에 따른 문제로 인해 WAP 통신 프로토콜과 경량의 WML를 사용한다. 이에 본 논문에서는 두 네트워크간의 프로토콜 변환과 데이터포맷 변환을 통해 상호 정보교환 및 공유 문제에 대한 해결방안을 제시한다. EPC 네트워크에서 제공하는 서비스인 IS(Information Service), DS(Discovery Service) 서비스와 이동 RFID 네트워크 U에서 리더가 부착된 핸드폰(Radio Frequency Mobile Station : RFMS)로 이용하게 될 IS, DS 서비스간의 연동 시 제기되는 가장 대표적 문제점인 표현방법과 통신 프로토콜의 차이의 해결을 위해 EPC-Proxy를 두어 그 안에서 EPC-Proxy의 정확한 기능 역할 및 동작과 이동 RFID 네트워크가 관할하는 RFID 태그에 대해서 이동 RFID 네트워크의 local ONS가 가져야 할 NAPTR RR 정보를 통한 EPC 네트워크와 이동 RFID 네트워크의 서비스 호환 및 상호운용 방식을 제시한다.

• Korean Journal of Remote Sensing
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• v.34 no.3
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• pp.565-578
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• 2018

In this paper, we investigate the feasibility of modelling image strips, instead of individual scenes, that have been acquired from the same orbital pass through the process of bundle adjustments. Under this approach, First, a rational function model (RFM) of the strip image is generated from the RFMs of individual images, such that the entire strip of images can be treated as a single image. Correction parameters are calculated through bundle adjustments between strip images. For the experiment, we used two stereo strips. Each strip image consists of three KOMPSAT-3A scenes. Experimental results show that it was possible to improve the initial model by using the control points located in a specific region of the strip. We showed that absolute orientation with moderate accuracy of 2 m errors were achieved from 12 ground control points for the three-image strips. The test results indicate that bundle adjustment of strip images could be more efficient than bundle adjustments of the individual scenes.