• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.560-565
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• 2002

In this paper, we implemented the sign board system that displays user's image, user's sentence, the information from DARC an[1 information based position by GPS module for vehicle. The existing sign board is displaying only user's image and sentence. Or other existing sign board is displaying the information via CDMA network. However, our system is also able to display the user's message like other system and gain the information more cheap by DARC. This system consists of 6 parts. The DARC control part classes the DARC information - news, weather, stock and time. The GPS control part gains moment and item to display with calculating the information of global position, direction, speed and satellite. The LED control part has two buffers to store and handle the image. The buffers help the system display various effected images on LED board. An external memory card includes the location based data, the option file and the displayed data files. The data files are stored by FAT 16 with the folder structure on external memory card. The USB controls the communication with PC. PC programs can control and monitor this system. This system is using G72l voice file format, for casting the information. This system was established at the vehicle and we monitored this system. The system displayed the DARC data , user's data and the location based data on the LED board, successfully.

• Broadcasting and Media Magazine
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• v.21 no.3
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• pp.9-20
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• 2016

디지털 라디오는 FM 라디오 대비 고음질 오디오 서비스와 더불어 청취자를 위한 부가 데이터 서비스를 동시에 제공해 줄 수 있는 기술로써 해외 선진국은 오래전부터 디지털 라디오를 도입하였거나 도입을 추진하고 있는 상황이다. 하지만 국내의 경우 오래전부터 디지털 라디오 도입을 논의해오고 있으나 아직 방송 방식조차 결정하지 못하고 있는 실정이다. 이에 글로벌 디지털 라디오 표준화와 서비스 현황 그리고 국내 기술개발 및 표준화 추진 현황을 살펴보기로 한다.

• Journal of Satellite, Information and Communications
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• v.6 no.1
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• pp.97-102
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• 2011

The Korean radio broadcasting system is analog. Digital Radio will transmit a digital signal to existing analog FM/AM. It provides clear sound quality, traffic information, weather information and various value-added services. In addition, the converted digital radio will be able to meet demand to growing demand for analog FM. DRM + is an area to place, depending on the frequency of usage to less interference can be placed anywhere. In this paper, DRM + system, a brief description, and is currently using the frequency status were described, accordingly DRM + candidate channel derived measures proposed, the existing analog broadcast and DRM + of interference effects through the simulation has been verified.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.9 no.6
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• pp.22-32
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• 2010

Increasingly advanced Information Technology (IT) has changed the operator so as to create more diversified and advanced traffic information demand. To deal with the changing demand in private sector, a concept of on-demand traffic information has been rapidly introduced. However VMS, a product of the first generation of ITS, which was designed to provide the unspecified individuals during driving the car with the basic level of traffic information by the public failed to actively change itself in such a changing pattern. This study was intended to describe the VMS system (tentatively, FM-VMS) which was further developed to accommodate the needs favoring the sophisticated PDA with the public role of providing the unspecified individuals with the equal information. FM-VMS introduced in this study is the device designed to transmit the voice and message to the drivers through the radio information device mounted on a car. A core technology is, unlike FM-DARC and RDS, the Water Making technology which directly inserts the digital signal into FM frequency in use. It's been currently used for broadcasting and security purpose. A detection rate as a result of testing FM-VMS system using Water Making technology was 90% or more in voice and message within 20m from test VMS. When a public-developed VMS information could be transmitted using FM frequency to the relatively vulnerable users (vulnerable to traffic information) in voice on a real-time basis to provide the regional traffic information, and furthermore, VMS message could be received through radio liquid using FM frequency only, it would obviously bring about the innovation in ITS as well as pave the way for creating the new added value down the road.

• Journal of Broadcast Engineering
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• v.14 no.3
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• pp.332-341
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• 2009

Terrestrial digital multimedia broadcasting(T-DMB) is one of mobile broadcasting services, and the commercial service was started in December 2005 in Korea. The performance targets of T-DMB are providing VCD(video CD) quality video and FM radio quality audio. In recent years, the researches for providing high quality video or audio service on T-DMB environments have been being carried out. To provide high-quality video or audio service, some additional data should be transmitted to the receiver as well as T-DMB video and audio data. Since the data rate for one T-DMB program is low, it is important to transmit the additional data at a low bit rate. In this paper, we propose a packetizing method for efficient transmission of the additional data to provide multichannel audio service on T-DMB environment.

• Journal of the Korea Computer Industry Society
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• v.2 no.6
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• pp.791-802
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• 2001

In this paper, DARC(Data Radio Channel) error correction decoder for the U Subcarrier Broadcasting System is designed of using (272,190)$\times$(272,190) product code based on (272,190) shortened difference set cyclic code. This decoder has error flag of column and row direction that can store the result of the error correction of column and row direction in the block and frame structure, is designed to be of no benefit the output with majority logic determination to cancel the corrected and determined bit, and can improve by using the error correction method that no error correction of the row direction is performed, if error correction of the column direction is completely performed by error flag.

• The KIPS Transactions:PartC
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• v.8C no.5
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• pp.517-524
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• 2001

There are cases that revoke the certification because of disclosure of private key, deprivation of qualification and the expiration of a term of validity based on PKI. So, a user have to confirm the public key whether valid or invalid in the certification. There are many method such as CRL, Delta-CRL, OCSP for the cert-validation of certification. But these method many problems which are overload traffic on network and the CRL server because of processing for cert-validation of certification. In this paper we proposed the realtime cert-validation of certification method which solved problems that are data integrity by different time between transmission and receiving for CRL, and overload traffic on network and the CRL server based on DARC.