• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.05a
• /
• pp.1096-1100
• /
• 2005

음성서비스 수요의 증대와 정보통신 기술의 급속한 발달로 국내 이동통신 시장이 확대되고 있는 오늘날 고객의 요구를 충족시키는 정액요금제도가 절실히 필요하다. 앞으로 상용화되는 위성DMB (Digital Multimedia Broadcasting), 지상파DMB, WiBro 등의 신규 통신서비스는 정액제를 기조로 하고 있다. 따라서 무선데이터 정액제 가입자에 대한 신뢰도 높은 수요예측이 국내 이동통신 사업자에게 매우 중요한 과제로 부각되고 있다. 본 연구에서는 무선데이터 정액제 가입자 수요를 이동통신 시장의 환경에 맞추어 Lotka-Volterra 모형을 확장하여 예측하였다. 무선데이터 정액제 가입자의 수요예측은 이동통신사들이 정액제 도입의 정당성과 도입 시기를 결정하고, 마케팅 전략을 수립하는데 중요한 역할을 할 수 있다. 또한 예측결과는 무선데이터 사업을 평가하는데 기초 자료로서 활용될 것으로 기대된다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2012.11a
• /
• pp.249-251
• /
• 2012

최근 대형 재난의 증가로 안전에 대한 관심이 증가하고 있는데 이러한 재난을 대비하기 위해서는 효과적, 효율적인 재난방송이 필요하다. 재난방송을 수신할 수 있는 단말 중에 휴대전화, 내비게이션 등의 휴대용 단말은 정전 상황에서도 이용할 수 있어 특히 유용하다. 본 논문에서는 휴대용 단말에서 이용할 수 있는 재난정보전달 기술을 분석하여 장단점을 평가하였다. 이를 위해 지상파DMB 재난경보방송과 스마트폰 어플리케이션, CBS(Cell Broadcasting System) 재난문자방송과 최근 연구 중인 자동인지 T-DMB 재난방송을 분석하고, 재난방송에서 중요한 특성인 안정성, 효율성, 자동인지(wake-up), 지역맞춤 서비스 등의 항목에 대해 평가하였다. 평가 결과 모든 특성을 만족하는 기술은 없어 복수의 기술을 동시에 적용하여 장점을 활용하는 방안과, 이에 따른 중복 수신 문제를 해결하기 위한 연구 및 협력이 필요하다는 결론과 차세대 재난방송 서비스인 자동인지 T-DMB 재난방송에서 이와 같은 특성을 만족시키고 빠른 시일 내에 보급 및 확산이 필요하다는 결론을 도출하였다.

• Journal of Korea Technology Innovation Society
• /
• v.8 no.3
• /
• pp.911-931
• /
• 2005

This paper analyzes the demand characteristics of DMB services using survey data. According to a Logit analysis, the willingness to adopt the services is higher if the would-be user is male, is better informed with the service, is watching TV longer, and is spending more for the telecommunications services. And the survey results tell us that for the stimulation of the service, efforts should be made to increase the level of public awareness of the services. The survey response from the would-be DMB users shows that the respondents who value the nationwide coverage and the numbers of channel are more inclined to use the satellite DMB service. On the other hand, the service charge and the availability of the terrestrial broadcasting channel for the time being does not seem to influence the intention of using the terrestrial DMB service. It could be interpreted that the potential user are deciding whether to use the service more by the quality and contents of the service rather than by the cost of the service.

• KIISE Transactions on Computing Practices
• /
• v.21 no.12
• /
• pp.798-803
• /
• 2015

DGPS is a technology that can improve the positioning precision of the existing GPS based on the correction information regarding reference station. Although the country is currently building infrastructure for DGPS correction information to be transmitted, it is being used only in limited areas for which DGPS expensive equipment is required. By enabling the development of the DGPS device using the smart phone, this limitation can be overcome, DGPS can be applied for various location-based services, and the implementation of the new model of location-based services may be enabled. In this paper, we introduce the development of a DGPS device for which high-precision positioning is possible using DGPS correction information received via the DMB network or mobile network in the smart phone environment.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.9 no.5
• /
• pp.123-127
• /
• 2009

In this paper, we suggested new additional data transmission technology for T-DMB system using MOK-SS(Mary Orthogonal Keying- Spread Spectrum)mapping method. We applied revised watermarking method of TxID(Transmitter Identification) technology mainly had been used for conventional ATSC-DTV(Advanced Television Systems Committee - Digital TV). And proposed schemes enhanced additional data rate using MOK-SS mapping method. We certified availability of our proposed technology by using various simulation and error rate performance analysis.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.14 no.3
• /
• pp.231-238
• /
• 2021

In addition to individual calls and group calls, the Trunked Radio System (TRS), which belongs to a group, can make calls simultaneously, and many users can use it within a limited time by adjusting the call time. Also, the LCX infrastructure network of the subway Most of the FM, firefighting radio, TRS of the National Police Agency and the terrestrial DMB service built in 2005 are commonly connected to the network for service and operation. In connection with the analysis, call reception sensitivity, handoff, interference with other signals, time delay, etc. were analyzed, and tests such as reception field strength for each output of the repeater and the success rate of the call terminal were conducted and the test results were analyzed. In addition, it will help TRS cell design and network construction by predicting equipment output capacity and service coverage based on test results.