• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.4
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• pp.39-45
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• 2009

In this paper, designed and fabricated the microstrip antenna using parasitic plane. This active antenna for the use of AM/FM, DMB(Digital Multimedia Broadcasting), GPS(Global Positioning System) band in vehicle. Fabricated active antenna was compared to existing planar antenna represents more than 15% size reduction and equivalence performance compared to commercial helical antenna. And satisfy performance in DMB, GPS band. This active antenna composed of single input port and two output ports and entire size of antenna is $133{\times}31{\times}1.2mm$.

• Proceedings of the KIEE Conference
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• 2006.04a
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• pp.75-77
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• 2006

In this paper, the technology of the conformance test for Broadcast Web Site Service (BWS) which is one of the data services of the T-DMB (Terrestrial Digital Multimedia Broadcasting) is proposed. First, the standard of the BWS Service is introduced and then the method of the conformance test of BWS bitstream and BWS receiver module is provided. A BWS bitstream analyzer is implemented for use in verifying the transmitted BWS bitstreams. To provide a means for the receiver manufactures to verify their own BWS receiver modules, a receiver test suite is developed including BWS test bitstreams and a BWS reference receiver module. The BWS bitstream analyzer includes the analysis function for the conformance test of MOT protocol, HTML, PNG, MNG, JPEG, and Ecma Script. Also, it was actually used for verifying the BWS test bitstreams. In the course of developing a HWS receiver module, 4he BWS receiver module under test can be verified by comparing the results of the BWS reference receiver module with those of the receiver module under test. when the same BWS test bitstreams are fed into the two receiver modules.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.275-277
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• 2007

Recent activation of DMB has enabled various high quality video, audio and data services. And there are various user facilities functions using digital data transmission. One of the various user facilities functions is EPG(Electronic Program Guide). EPG supports schedule of programs on screen for. audiences. EPG is composed to time, title, channel, genre etc. Users can select a program what they want to browsing. Currently EPG services are displaying program schedule on screen visually and make users to input ke:ywords with keypads, remote control devices or touch screen etc. However, this approach could cause a serious restriction to some users like to drivers or visually handicapped persons. A standard for a voice EPG to T-DMB is proposed. This method must be transferred VoiceXML based EPG files from the transmitter to receivers. This approach has a problem to process a standardization because the transmitter and receivers should be modified. We proposed and implemented a voice EPG platform that generates the voice EPG files from T-DMB SI without transferring voice EPG file from the transmitter.

• ETRI Journal
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• v.28 no.5
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• pp.583-592
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• 2006

Digital broadcasting technology has developed focusing on multi-channel/multi-media, high-definition quality, and mobility-support. Recently, there has been a clear trend toward bidirectional service with the convergence between broadcasting and communication. The broadcasting viewer is no longer simply a passive receptor but has also become an information generator. Currently, the digital multimedia broadcasting (DMB) specifications are the major standard for portable digital broadcasting and have been establishing the overall guidelines for bidirectional service using the MPEG-4 system. While detailed specifications for DMB systems are not well-established for bidirectional service yet, they share the basic concepts underlying the European Eureka-147 Digital Audio Broadcasting (DAB) system. This paper develops key scenarios for bidirectional service in DMB, describes the signal transaction of broadcasting and return channels, and demonstrates typical scenarios using binary format for scenes (BIFS) in the MPEG-4 system.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.1
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• pp.173-179
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• 2012

In this study, cavity filter performing BPF function in Korea T-DMB system was designed by using of HFSS simulation tool, and we compared measured results with the simulated data. By simulation of HFSS that is magnetic and electric 3D simulating tool, we can save time and money maximumly by checking performances before actual filter implementation. Optimum conditions for the cavity filter were delivered based on the cylindrical waveguide characteristics. Measured results by implementation were compared with the simulation data.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.1
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• pp.85-92
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• 2007

Traffic accident number is decreasing tendency every year. But, large size accident or hit-and-run case increases continuously. As well as, traffic accident causes real form of accident ambit thats why, social expense rises. For that reason we are going to present our plan that can prevent traffic accident when traffic accident occurs, we presented our idea that can arbitrate traffic accident quickly. Driver can know more correctly traffic circumstance through hearing and sight by using DMB. Finally, we suggested plan that supply traffic information that is more effective by TPEG.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.2B
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• pp.129-136
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• 2006

We propose a new data carousel scheduling algorithm for on-demand data broadcasting in DMB. The server divides data items into two sets named hot and cold, according to request statistics from clients. When constructing a data carousel, hot items are placed periodically with their upper limit of broadcasting frequency. If there are empty slots after placing hot items, cold items with high request ratio are placed until the carousel is full. A cold item is broadcast only once in the caroulsel. For the response on clients' requests, our proposed scheme is shown to have high success ratio with short waiting time.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.219-222
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• 2007

지상파 DMB 데이터 표준인 MPEG-4 BIFS Core2D@Level1을 이용하여 데이터 콘텐츠 구현 시, BIFS 언어가 갖고 있는 문제점으로 인해 GUI 표현이 어렵다. 따라서 본 논문에서는 이와 같은 문제점을 해결하여 데이터 콘텐츠 개발자가 손쉽게 GUI 기능을 구현할 수 있도록 MPEG-4 BIFS GUI 프로파일을 설계하고 구현하였다. DMB 환경에 적합한 GUI 노드 선정을 위해 콘텐츠 개발자의 요구사항 조사와 타 솔루션과의 비교 분석 및 데이터 콘텐츠에서 자주 쓰이는 기능을 파악하였으며, 이와 같은 분석 내용을 바탕으로 GUI 프로파일을 구성을 위한 노드들을 정의하였다. 각 노드들은 XMT 형식으로 구현되었으며, 정의한 프로파일 검증을 위하여 테스트용 데이터 콘텐츠를 개발하였다. 이와 같은 연구를 통해 DMB 데이터 콘텐츠 개발 시 개발자가 화면 구성에 필요한 GUI를 손쉽게 구현할 수 있게 된다면, 다양한 데이터 콘텐츠 개발을 위한 발판이 되어 향후 데이터 방송 활성화에 기여할 수 있을 것이라 기대된다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.10
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• pp.1731-1736
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• 2008

In this paper, singly fed circularly polarized nearly-square patch antenna for receiving S-DMB is presented. It used teflon substrate of relative dielectric constant ${\in}_{\gamma}=2.2$ and the sire is $40{\times}40{\times}15[mm]$. Experimental results of fabricated antenna show that input return loss and axial ratio are about 22MHz, 25MHz at the center resonant frequency, respectively. And fabricated LNA has gain of 27.5 [dB], NF of 1.27 [dB], input return loss of -15.4 [dB] and output return loss of -18.9 dB, respectively. Simulation results and experimental results are good agreements. This proposed antenna is well able to handheld gadgets for receiving S-DMB.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.670-671
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• 2012

This paper presents a method of constructing telematics terminal embedded architecture for DMB TPEG data service The proposed embedded architecture was designed for terminal. Also, we use WIPI which was used for standard based on mobile middle-ware, and TPEG decoding which was used for Window CE. We can see the advantage compare with previous methods.