• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.2
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• pp.157-162
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• 2011

International Telecommunication Union(ITU), recommended a propagation prediction models that can be applied to a various propagation environments that many services have been established in the field of broadcasting and telecommunications using ITU-R. Each propagation prediction models are revised with the complement procedures of an expected difference of channel environment and prepared for a standard of a propagation prediction. In this research, it is possible to realized a practical propagation prediction in each transmitting station for a broadcasting environments of ITU-R Rec. P.1546-3 model, so called the point-to-area, using supplementary parameters of the transmitting station specification.

• Journal of Broadcast Engineering
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• v.18 no.1
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• pp.59-65
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• 2013

Recently, the digital television transition from analog television to digital television has been progressing in terrestrial broadcasting. As a result of the DTV transition, additional reassignments and deployments of TV White spaces (TVWS) caused by co-channel interference (CCI) were needed. In this paper, we investigate the TVWS caused by CCI using Longley-Rice and ITU-R P.1546 propagation model, which are the most widely-used propagation model. In addition, we analyze the service coverage radius and CCI radius according to the height of transmitter antenna and transmitting power. The results show that the ratios of CCI radius to service coverage radius in Longley-Rice and ITU-R P.1546 propagation model are about 2.54 and 2.07, respectively.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.638-645
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• 2013

For the efficient use of the insufficient frequency resources, a precise prediction of field strength based on various propagation environments should be set up to design of radio stations with reliable transmit power and service coverage. Therefore, many countries have tried to secure the propagation models suitable for their each geographical environments, and also, some models like BCAST were developed by Korea, but these models give the different results compared to measured values. In this paper, based on the measurements of DTV broadcasting services in domestic rural area, analysis and comparison of ITU-R P.1546 and BCAST models provide errors between measured and predicted values, and some points for improving SMI system has been proposed. As a result, P.1546 model provides the valid predicted data similar to measured data, but BCAST model has some problems of large deviation and higher prediction to measured data. In future, these problems and fading loss due to a forest or group of trees, and reflection loss due to a lake or sea need to be studied carefully.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.2
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• pp.247-254
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• 2021

Problems such as a limited frequency resource and interference between adjacent bands have been continuously raised because of rapidly developing wireless technology and communication service. In order to solve that problem, government has been developed and operating the Spectrum Management Intelligent System(SMIS). This paper compares the results simulated by SMIS with the ATDI and the Matlab coded provided by ITU-R for verification of SMIS operating for the public interests. The Recommendation ITU-R P.526, P.1546, and P.1812 among the propagation model loaded in SMIS were chosen because of the relation to the broadcasting service. The comparison and analysis result shows that the outputs derived by SMIS has the small error of less than 1 dB. This research could be utilized for the policy establishment and R&D for the frequency allocation and the interference between adjacent bands.

• Journal of Broadcast Engineering
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• v.16 no.5
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• pp.824-833
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• 2011

In this paper, using the Rec. ITU-R P.1546 explaining a propagation prediction model in the VHF and UHF bands, we propose the analytical methodology for calculating the service distance and field strength for analogue and digital TV receivers. From the derived formulation of the receiver field strength, some computation results are presented and discussed in terms of the equivalent level of service caused by analogue to digital TV conversion. The suggested method is also applicable to the analysis of frequency coordination or compatibility from unwanted signal in VHF and UHF bands.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.435-436
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• 2007

In this paper, we have been developed the software in order to ostinato for spill over for TV broadcasting signals between Korea and Japan and analyzed those signals using APD curve. In Busan, we have been measured channel of Japan TV broadcasting signals during 9 months from February 2006 to October 2006. That system has been controled and translated the measured data to remote-control place. Finally it has computation and compared in the APD curve using ITU-R P.1546.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1546-1548
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• 2011

최근 스마트폰의 보급률이 높아짐에 따라 스마트폰에 탑재된 카메라의 사용 또한 급증하고 있다. 이에 스마트폰으로 촬영한 사진에 효과를 적용하고 꾸미는 작업에 대한 사용자의 요구가 증가하고 있다. 본 논문에서는 사진에 폴라로이드 효과를 적용하고 다양한 꾸미기 기능을 제공하는 안드로이드 기반 스마트폰 어플리케이션인 Polandroid를 제안하고 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1546-1547
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• 2011

최근 스마트폰 열풍이 거세게 일면서 실생활에서 쉽게 유용하게 쓸 수 있는 스마트폰 애플리케이션에 대한 요구가 높아지고 있다. 이에 본 논문에서는 스마트폰을 통해 실생활에서 쉽게 화초에 대한 정보를 얻고 화초를 기르는데 도움을 주는 안드로이드 기반 애플리케이션인 Smart Garden을 제안하고 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1546-1549
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• 2008

유비쿼터스 시스템이 발전함으로 많은 사람들이 시스템을 사용함으로 인하여 정보보호에 대한 중요성이 증대되고 있다. 본 논문에서는 유비쿼터스 시스템에서 데이터를 표현하기 위하여 널리 사용되는 RDF/S가 정보보호에 대하여 취약함에 주목하고 RDF/S에 대한 정보보호를 위한 RDF/S 스키마와 추론에 필요한 규칙을 소개한다.

• Journal of Advanced Navigation Technology
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• v.17 no.5
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• pp.484-490
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• 2013

With the rapid development of wireless communication at VHF and UHF bands, there is an increasing need for the reliable propagation prediction tools. Therefore, the different propagation models that have been developed in many countries as well as korea has been trying to secure a model suitable for their geographical area but then it is giving us a different result when we compared it to measured values. In this paper, based on the measurements of DTV broadcasting services in domestic urban area, analysis and comparison of ITU-R P.1546 and BCAST models provide errors between measured and predicted values, and some points for improving SMI system has been proposed. As a result, P.1546 model provides the valid predicted data similar to measured data, but BCAST model has some problems of large deviation and higher prediction to measured data. In future, these problems and diffractions due to high buildings need to be studied further.