• Journal of Broadcast Engineering
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• v.21 no.3
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• pp.404-411
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• 2016

In this paper, we investigate the radio wave radiation pattern to measure the actual field strength for the transmission antenna dipole antenna and the CP-ring antenna being used in our country as FM station, and the comparison was for field application. Compare results, If the transmitting station and the relay station which is located in the middle of a service area has been a useful CP-dipole antenna (four directions). CP-ring antenna having a directivity because the reflection effect of the tower was able to adjust the orientation to prevent the spread of menstrual another service area in the main direction was able to radiate high propagation 5~9dB. Especially, If the transmitting station and the relay station is located on one side of the service area for radiating radio waves in three directions by using the CP-ring antennas focus the orientation of the antenna in populated areas and road area can improve the broadcast reception environment.

• Journal of Broadcast Engineering
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• v.24 no.4
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• pp.670-675
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• 2019

AM radio broadcasting has the advantage that the sound quality is lower than that of FM radio but the service area is wide and at night it can be transmitted even to overseas due to ionospheric reflection. AM radio broadcasts usually transmit large amounts of several tens to several hundreds of kilowatts (KW), requiring a lot of power, which is a financial burden on broadcasters. Recently, it is required to introduce a way to reduce the power of AM radio broadcasting in Korea. Therefore, it is possible to save a certain amount of power compared to the conventional AM radio broadcasting, and it is possible to maintain the existing license service area and sound quality, and what policies are needed to introduce the technology. In this paper, we predict the reduction of transmission power when a high efficiency transmission system is applied to existing AM radio broadcasting transmission system. As a result of the research, AMC adopting the high efficiency transmission method instead of the conventional AM radio transmission method, and when the modulation ratio of AM radio is 70%, if -3 dB companding is applied, the annual transmission power charge is decreased from 5,185,838,160Won to 3,528,900,086Won with saving of 32.0%, When -6 dB companding is applied, it is expected to be reduced to 2,608,378,934Won, which is 49.7% savings.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.329-330
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• 2010

남북의 상호이해, 신뢰회복, 이질감 완화를 위해 대내외적 정치적인 변수에 상관없이 남북방송교류는 지속되어야 한다. 이를 위해 기존의 사회문화적, 단발적인 남북방송교류를 비정치적인 분야인 방송기술협력을 기반으로 한 장기적이고 지속적인 프로젝트형 남북방송교류로 전환하는 하는 것이 필요하다. 본고는 평화공존과 협력이라는 방향성 아래 남북이 상생할 수 있는 효과적인 방송기술협력 방안을 모색하고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.323-324
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• 2010

하나 팔면 얼마 남을까? 그리고 얼마에 판매할까? 콘텐츠 유통실적에 관한 뉴스나 연구보고서들이 많다. 그런데 다큐멘터리 하나 팔면 얼마가 남을까? 수출 몇 만$를 달성했다고 이야기하지만, 다큐 한편 팔면 얼마가 남는 것인가라는 감이 오지는 않는다. 유통과 관련하여 디지털시대의 방송통신콘텐츠 개념과 최근 유통실적 및 동향에 대해서 알아보기로 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.310-311
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• 2010

현재 은행들은 종합금융서비스업(Total Financial Solution)인 금융그룹화 추진에 비 은행 사업 분야를 보완하여 금융 업무 대형화를 강화하고 있다. 이에 따라 대형화된 은행권에서는 계열사 간 커뮤니케이션 부재를 해결하고, 각기 다른 기업문화를 통합 할 수 있는 조직 내 커뮤니케이션 매체로 위성영상방송을 찾게 된다. 본 논문에서는 대형화된 은행 내 조직 커뮤니케이션 매체로서의 위성영상방송이 조직에 어떠한 효과를 미치는지 알아보았다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.174-176
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• 2017

본 논문에서는 미국, 영국과 국내의 라디오방송 관련 현황들을 보고, 국내 라디오방송이 미국, 영국 대비 청취율이 1/3 로 낮지만 스마트폰을 이용한 라디오청취율이 증대되고 있으며, 하이브리드라디오 도입이 될 것이므로, 라디오 방송 청취율이 더욱 증가할 것으로 전망하였다. 아울러 이동통신망이 불능화되는 대형재난상황을 대비하고 라디오 청취율을 증대시키기 위해 추진되는 하이브리드라디오의 도입에 있어 고려되어야 요구사항들과 서비스 방안들을 제시하였다. 본고의 내용은 하이브리드라디오도입을 위한 정책과 서비스 기획 및 시스템 설계에 참고가 가능할 것으로 기대된다.

• MALSORI
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• no.64
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• pp.15-37
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• 2007

The purpose of this paper is to examine the change of the times on the transmission rate of broadcast message. In order to find out the research results, I collected past recorded news tapes and selected 22 radio news out from era of Japanese Imperialism, 1950's, 1960's and contemporary age. Next I measured each announcer's reading rate, and compared change on news-reading rate between present and past approximately 50 years ago. The results of study with such procedures and methods are as follows : the average reporting rate of newscasters in each era is different. From these results, we can easily grasp diachronic change in the transmission rate of broadcast message. Namely, the results show us that present announcers read news faster than the group of past era of Japanese Imperialism by 68%.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.7C
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• pp.672-679
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• 2006

Cognitive radio, which is designed to dynamically adapt its transmission to the environments, is believed to be one of the fundamental techniques for future spectrum utilization. As the first step of cognitive radio, spectrum sensing is treated as the most important technique, through which cognition is well explained. In this paper, we propose a spectral correlation based detection method for spectrum sensing. An unlicensed secondary user system operating in TV broadcast bands is taken as an example. Based on the cyclostationarity of communication signals, spectral correlation function is used to minimize the effect of random noise and interference. Energy measurement and peak detection based criteria are proposed. Simulation results show that the proposed detection method outperforms the energy detection and is more suitable for spectrum sensing in cognitive radios.

• Broadcasting and Media Magazine
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• v.11 no.1
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• pp.78-85
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• 2006

Cognitive radio is a paradigm for wireless communication in which either network of wireless node itself changes particular transmission or reception parameters to execute its tasks efficiently without interfering with the licensed users. This paper represents a performance of the cognitive radio technology on dual polarized MIMO system using six-port receiver. Six-port technology is well known direct conversion receiver. In this paper, a six-port phase discriminator based polarization signal separation is shown. That is, the SER(Symbol Error Rate) performance is improved using polarization separator and simple receiver architecture is proposed applying six-port receiver. The six-port technology has priority to adapt changeable frequency system and variable environments for cognitive radio. In general, dual polarized MIMO system has good capacity and quality using polarization separator [1].

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.549-554
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• 2006

The objective of this paper is to propose a system by means of which the utilization of radio frequency spectrum may be improved from the state of extreme inefficiency at the present time in Kazakhstan to a state of efficiency and equilibrium in the future. The main solutions to efficiently use radio frequency spectrum in Kazakhstan will be described in this paper. There are 'Spectrum Utilization, Spectrum Sharing and Reuse the Spectrum' in which the radio frequency can be propagated in wide range using smalt amount of spectrum, or broadcast several channels via one spectrum sharing. In order to embed these systems in practice it will be better to make modifications consider Government policy and geographical and social requirements.