• Journal of Broadcast Engineering
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• v.20 no.4
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• pp.598-605
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• 2015

Effective alerts will drastically mitigate the disaster impacts. One way to enhance the effectiveness is to prepare multiple alert distribution channels. In this paper, we propose a new emergency alert distribution system that will solve the weaknesses of the current distribution systems, such as Cell Broadcasting System and T-DMB Automatic Emergency Alert Service. The weaknesses are: the limitation of message length, small portions of terminals that can receive and display the alert signal, and one-way communication service. To solve these problems, we propose an emergency alert distribution system over the Internet with RSS (Rich Site Summary) format. The system also has the capability of adaptive alert filtering according to the receiver characteristics. We analyzed the characteristics of RSS as an alerting format, and draw functional requirements satisfying use case scenarios. We designed the system only with major requirements and verified it on our test bed. Sending richer message contents through various receiving terminals, the system will achieve more effective emergency alert service.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.256-257
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• 2013

최근 동일본 대지진 또는 중국 쓰촨성 대지진 등 국가적인 재해 재난이 한반도 주변에서 자주 일어나고 있다. 대한민국도 마찬가지로 집중호우로 인한 인명피해가 발생되기도 했다. 이러한 경우 해당 재난지역 내의 주민들이 지역상황을 인지하고 대피하게 할 수 있다면, 인명피해를 크게 줄일 수 있을 것이다. 이러한 문제의 해결책으로 보급률이 뛰어나고 개인 휴대형 기기인 휴대전화기를 통한 재난방송 기능이 제안되었다. 여기에는 재난 방송의 특성상 지연시간과 수신율에 문제점이 있을 수 있다. 그러므로 방송 (broadcasting)개념이 도입되어 다수의 사용자가 한 번에 수신할 수 있도록 CBS (Cell Broadcasting Service) 서비스를 제공하고 있다. 하지만 이 또한 현실적으로 LTE (Long Term Evolution) 망에서만 가능하며 3세대 통신, WCDMA (Wideband Code Division Multiple Access) 에서는 대기전력 소모에 의한 배터리 소요로 제외되었다. 본 지에서는 CBS를 이용하여 WCDMA 단말을 소지한 사용자에게도 DMB를 통해 재난상황을 인지 할 수 있는 새로운 게이트웨이를 제안한다.

• Proceedings of the KIEE Conference
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• 2006.04a
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• pp.66-68
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• 2006

DVB-H (Digital Video Broadcasting for Handhold) is a new standard, currently being developed, which defines mobile enhancements for the DVB-T (DVB-Terrestrial) standard. For the reception of service via mobile handhold devices, seamless mobility and power saving are essential requirements of DVB-H. For seamless handover, the receiver should monitor neighboring cells and it increases the power consumption. And so, power efficient handover scheme to support both mobility and power saving is required. In this paper, we propose cell searching scheme to reduce power consumption by reducing the number of frequency scanning during the handover. Through the numerical evaluation, we analyzethe performance of handover schemes.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.5
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• pp.325-333
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• 2021

With the rapidly changing era of the fourth industrial revolution, the utilization of IT technology is increasing. In addition, the demand for security authentication is increasing as shared services or IoT technologies are being developed as new business models. Security authentication is becoming increasingly important for all intelligent devices such as self-driving cars. However, most location-based security authentication technologies are being developed mainly with technologies that utilize server proximity or satellite location tracking, which limits the scope of their physical use. Location-based security authentication technology has recently been developed as a complementary replacement technology. In this study, we introduce location-based security authentication technology using cell broadcasting technology, which has a wider range of applications and is more convenient and business-friendly than existing location-based security authentication technologies. We also introduced application cases and business models related to this. In addition to the current status of technology development, we analyzed current changes in business models being employed. Based on our analysis results, this study draws the implication that technology diversification is necessary to improve the performance of innovative technologies. It is meaningful that it has found and studied advanced technologies other than existing location authentication methods and systems.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.1
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• pp.183-188
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• 2008

Satellite DMB(Digital Multimedia Broadcasting) uses the Cap Filler(GF) that provides a service to the wave shade area of the satellite signal that is a non-line of sight area. The GF is the repeater and the Satellite DMB Systems certainly must construct the GF Network toguarantee the movement reception of the terminal. As the coverage of the GF is formed the Cell or Sector, when the multiple GF is established to be contiguous, the problem of the interference will be able to occur. This paper describes the Satellite DMB system and the GF, and it investigate the design fundamentals plan of the GF Network that it will be able to reduce this problem. As a result, in case of the distance that GF and terminal unit is above 4.6Km, service is not provided because of quality degradation according to mutual interference.

• Journal of Broadcast Engineering
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• v.27 no.1
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• pp.80-90
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• 2022

Currently, the domestic early warning system is issued differently for each disaster, and is operated independently by relevant organizations from central government to local governments. Representative domestic disaster warning systems include disaster broadcasting using CBS(Cell Broadcasting Service) and DMB(Digital Multimedia Broadcasting) Automatic Emergency Alert Service, DITS(Disaster Information Transform System) transmitted and displayed on TV screens, automatic response system, automated rainfall warning system, and disaster message board. However, due to the difference in the method of issuing each emergency alert at the site of an emergency disaster, the alerts are issued at different times for each media, and the delivered content is also not integrated. If these systems are integrated, it is expected that damage to people's property and lives will be minimized by sharing and integrated management of disaster information such as voice, video, and data to comprehensively judge and make decisions about disaster situations. Therefore, in this study, we present a plan for the integration of the disaster warning system along with the analysis of the operation status of the domestic early warning system.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.253-259
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• 2011

In a ubiquitous society, the world is changing to the place where we can access to network anytime, anywhere, on any device. The mobile internet is leading the ubiquitous world and the most commonly used medium is a cell phone. However, it is uncomfortable to link to cafe, blog, and mini homepage. Because we have to stop wap service in order to upload the mobile contents like photos, videos, sound recordings produced by mobile phones. Also we have to re-access. So, in this paper content management system was designed and implemented which mobile users don't have to stop wap service in order to upload photos, videos, sound recordings produced by mobile phones. Also it supports upload in wap service integrative medicine diagnosis and contents can be managed by category.

• Journal of Communications and Networks
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• v.13 no.5
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• pp.494-498
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• 2011

Satellite digital multimedia broadcasting (S-DMB) systems use gap fillers (GFs) to provide wireless multimedia services to non-line-of-sight locations. GFs act as repeaters, and S-DMB systems require GF networks in order to guarantee mobile reception. Each GF covers a cell or sector. In order to provide contiguous coverage of an area comprising two or more cells or sectors, multiple GFs are needed. However, when multiple GFs are situated close to each other, interference is likely to occur. As a result, in this study, we have investigated system-level environments for planning the design of interference-free GF networks in S-DMB systems. Our investigations revealed that S-DMB services are unavailable because of quality deterioration caused by interference when the delay attributable to a GF and the satellite signals exceeds ${\pm}$256 chips and the distance between the GF and its reception terminal is greater than 4.6 km. On the basis of this analysis, we conducted a field test that confirmed that the above-mentioned time delay can be controlled in such a way as to ensure high quality S-DMB services.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.11a
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• pp.12-14
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• 2020

코로나와 같은 전파력이 높은 감염병의 확산을 감소하기 위해서는 광역적으로는 방역 및 위생 수칙에 대한 정보 제공이 요구되며, 개개인별로는 접촉 등 전파 위험에 노출된 상황이나 장소 등에 대한 신속한 정보가 필요하다. 이러한 기능을 부합하는 재난경보 매체로는 개인이 보유한 휴대폰 단말을 통해 재난정보를 제공하는 긴급재난문자 서비스를 들 수 있다. 브로드캐스팅 방식을 통해 필요한 지역 및 시간에 일괄적으로 정보를 제공할 수 있다는 장점이 있으며, 이에 코로나 대응을 위해 국내를 비롯한 각국에서의 활용이 증가하는 추세이다. 본 논문에서는 코로나 시대에 따른 여러 나라의 긴급재난문자 활용에 대해 분석하고 앞으로의 긴급재난문자의 활용방안에 대해 논의하고자 한다.

• Journal of Internet Computing and Services
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• v.11 no.2
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• pp.143-153
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• 2010

When providing high quality panoramic video across the Internet, mobile communications, and broadcasting areas, it requires a suitable video codec that satisfies both high-compression efficiency and random access functionality. The users must have high-compression efficiency in order to enable video streaming of high-volume panoramic data. Random access allows the user to move the viewpoint and direction freely. In this paper, we propose the parallel processing scheme under cell units in order to improve the performance of streaming service for large screen panoramic video in 10Mbps bandwidths based on H.264/AVC with high compression rate. This improved algorithm divides a screen composed of cells less than $256{\times}256$ in size, encodes it, and decodes it with the cells in the present view. At this point, encoding/decoding is parallel processed by the present cell units. Also, since the cells only included in the present view are packed and transmitted, the possible processing of not extricating blocks is proven by experiment.