• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.39-54
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• 2018

This study aims to expand K-Wave business. For this, it firstly investigated previous studies and pointed out limitations of the current scope of the K-Wave business. Therefore, as a theoretical background, it attempts to construct an analysis framework based on four types of creativity type model and to redefine the concept of K-Wave business, which refers to a series of business activities that create, utilize the asset, and reuse the originality of intellectual property assets. This study analyzes the business activities of K-Wave's asset creation, utilization, and talent linkage during 2013~2017. The scope of the asset creation covers the highest ranked movies, dramas, and K-pops, while the utilization of those is analyzed in cosmetics, food, and fashion industries. The personal talent is the source of new K-Wave value creation and Webtoon IP is analyzed. As a result, in the case of movies and dramas, the representative market is China, which is the result of the efforts to avoid the continuation of China's regulation and the development of local OTTs. It is confirmed that the product development for Chinese consumers is active as activities of K-Wave utilization in cosmetics, food and fashion. Interesting is that new K-Wave content is circulated in the beauty sector. Finally, it is confirmed that Webtoon IP, which has been structured with a solid story in individual talent, is the origin of new K-Wave asset creation such as movies and dramas.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.3
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• pp.39-47
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• 2015

In this paper, we propose a new time synchronization algorithm using CoAP(constrained-application protocol) in sensor network environment, which handles a technique that synchronizes an explicit timestamp between sensor nodes not including an additional module for time-setting and sensor node gateway linked to internet time server. CoAP is a standard protocol for sensor data communication among sensor nodes and sensor node gateway to be built much less memory and power supply in constrained network surroundings including serious network jitter, packet losses, etc. We have supplied an exact time synchronization implementation among small and cheap IP-based sensor nodes or non-IP based sensor nodes and sensor node gateway in sensor network using CoAP message header's option extension. On behalf of conventional network time synchronization method, as our approach uses an exclusive protocol 'CoAP' in sensor network, it is not to become an additional burden for synchronization service to sensor nodes or sensor node gateway. This method has an average error about 2ms comparing to NTP service and offers a low-cost and robust network time synchronization algorithm.

• The KIPS Transactions:PartC
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• v.8C no.6
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• pp.821-830
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• 2001

H.323 proposes to use Mobile IP and H.323 ad hoc conference signaling to provide Handoff function to a mobile terminal. But H.323 ad hoc conference signaling has a drawback. It requires an H.323 endpoint to do a complex conference signaling which makes inter-operability between H.323 endpoints difficult and takes the longer signaling time. In this paper, we propose an Handoff signaling using H.323 rerouting(Third party initiated Pause and Rerouting). H.323 rerouting signaling only requires an H.323 endpoint to do H.323 basic signaling in reestablishing media channel, and makes inter-operability more easier and provides the faster Handoff. To do this, our H.323 GK has derived H.245 control channel using tunneling for all H.323 calls including the fast connect calls which enable endpoints communicate each other if they don\`t have H.245 control channel. In order to evaluate the performance of the proposed signaling, we have conducted an experiment that compares a call transfer signaling using H.323 rerouting with ad hoc conference signaling in inter-operability and signaling delay. The results of our experiment shows that the call transfer signaling can inter-operate with four H.323 endpoints among five H.323 endpoints of other vendors and reduces the signaling delay average 1.4 sec.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.85-91
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• 2013

Recently, the weight of high-quality multimedia contents is explosively growing out of the network total traffic. This steep increase of media contents to require huge traffic does not contribute to the generation of revenue streams and it leads to the situation of dumb pipe to trouble network providers into the big burden of investment on the network expansion. Accordingly, the transfer to the smart network to enable the effective delivery of large-scale media is imminently challenging issue to the network providers to seek the profitable business. The smart network revolves around the technologies to enhance end-to-end quality and fair usage with network resources and to optimize the traffic for the contents delivery over the concept of Content-Centric Network. In this paper, we propose an architecture and fundamental functions suitable for the smart network and suggest improved test results through the construction of an experimental network.

• Journal of Communications and Networks
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• v.12 no.1
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• pp.74-85
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• 2010

For the purpose of compromising hosts, attackers including infected hosts initially perform a portscan using IP addresses in order to find vulnerable hosts. Considerable research related to portscan detection has been done and many algorithms have been proposed and implemented in the network intrusion detection system (NIDS). In order to distinguish portscanners from remote hosts, most portscan detection algorithms use a fixed threshold that is manually managed by the network manager. Because the threshold is a constant, even though the network environment or the characteristics of traffic can change, many false positives and false negatives are generated by NIDS. This reduces the efficiency of NIDS and imposes a high processing burden on a network management system (NMS). In this paper, in order to address this problem, we propose an automatic portscan detection system using an fast increase slow decrease (FISD) scheme, that will automatically and adaptively set the threshold based on statistical data for traffic during prior time periods. In particular, we focus on reducing false positives rather than false negatives, while the threshold is adaptively set within a range between minimum and maximum values. We also propose a new portscan detection algorithm, rate of increase in the number of failed connection request (RINF), which is much more suitable for our system and shows better performance than other existing algorithms. In terms of the implementation, we compare our scheme with other two simple threshold estimation methods for an adaptive threshold setting scheme. Also, we compare our detection algorithm with other three existing approaches for portscan detection using a real traffic trace. In summary, we show that FISD results in less false positives than other schemes and RINF can fast and accurately detect portscanners. We also show that the proposed system, including our scheme and algorithm, provides good performance in terms of the rate of false positives.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.270-273
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• 2010

스케일러블 비디오 부호화(SVC: Scalable Video Coding)는 하나의 비트스트림 결과물로부터 둘 이상의 다중 비트율 및 해상도, 프레임율을 추출할 수 있도록 MPEG의 스케일러블 비디오 코딩 국제 표준을 준수하여 부호화한 비디오 비트스트림을 의미한다. 우리는 SVC(Scalable Video Coding)기반기술을 이용하여 하나의 콘텐츠를 통해 소비환경에 적응적인 비디오 스트리밍 서비스를 IP망을 기반으로 적용하기 위한 응용기술을 개발하고 있다. 본 논문에서는 단말로 부터 전송채널에 대한 상태를 전송받아 이에 맞게 콘텐츠를 적응변환 하고 다양한 품질의 단말에서의 스트리밍을 제공하는 SVC 미디어 서버를 관리하는 SVC 서버 관리 제어기의 설계 및 그 구현에 관한 내용이다. 이와 같이 SVC 서버 관리 제어기의 개발을 통해서 SVC의 다양한 콘텐츠 적응레벨을 설정하고 관리할 수 있다.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.663-665
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• 2004

Ethernet-based passive optical network(EPON) technology is being considered as a promising solution for next-generation broadband access network. It must have the property of high efficiency, low cost, and support quality of service(QoS). A major feature for this new architecture is the use of a shared transmission media between all connected optical network unit(ONU). Hence, medium access control(MAC) arbitration mechanisms are essential for the successful implementation of EPON. In this paper we propose a simple dynamic bandwidth allocation(DBA) algorithm that improves the performance of network and supports IP-based multimedia applications with the bursty data traffic. In addition, we introduce analytic models of proposed algorithms and prove the system based on our algorithm to be asymptotically stable. Simulation results show the new DBA algorithm provides high bandwidth efficiency and low queueing delay of ONU in EPON.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.325-328
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• 2016

본 논문은 2016 년 6 월 TTA 개정 표준 "HTML5 기반 스마트 TV 플랫폼(TTAK.KO-07.0111/R2)"에서 스마트폰, 태블릿 등 컴패니언 디바이스를 통해 스마트 TV 에 설치된 서비스 애플리케이션(이하, 앱)을 원격으로 조회, 실행, 종료 등의 제어를 지원하는 표준 기술을 소개한다. 이 기술은 표준에서 이미 정의된 멀티스크린 기술을 바탕으로 컴패니언 디바이스(모바일, 테블릿 등)를 통해 스마트 TV 를 인지하고 해당 TV 의 IP 주소 정보를 인식하여 JSON-RPC 프로토콜을 이용한 함수 형식 제어 요청을 통해 정보를 전달하는 방식으로 스마트 TV 수신기는 앱 정보 제공, 특정 앱 실행, 앱 종료 등 다양한 원격 앱 제어 기능을 서비스한다. 또한, 해당 원격 앱 제어 기술을 PC 기반의 가상환경인 스마트 TV 2.0 에뮬레이터 구현으로 표준기술에 유효성 검증과 서비스 응용 사례를 설명한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.146-149
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• 2014

최근 ATSC는 방송망 기반의 서비스호환 3DTV 방송서비스 표준완료 이후 이종망 환경에서 하이브리드 3DTV 방송서비스에 대한 표준화를 진행 중에 있다. 본 논문에서는 기존의 디지털방송 화질열화 없이 Full HD 3D 화질을 보장하기 위한 방송망 및 IP 망 연동형 3D 비디오 방송시스템을 제안한다. 특히, ISO/IEC 23009-1 DASH를 활용한 3D 부가 영상 전송, 이종망 환경하에서 안정적인 3D 비디오 동기화 및 하이브리드 3DTV 수신기 개발을 위한 시스템 타켓 디코더 모델을 기술한다. 실험결과, 제안된 기술은 하이브리드 3DTV 방송 표준화에 직접적으로 적용될 수 있으며, 하이브리드 3DTV 인코더 및 수신기 개발에 있어서 참조 모델로 활용될 수 있음을 확인하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.137-138
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• 2017

ATSC 3.0 방송게이트웨이는 원격의 송신소에 설치된 다수의 송신기들(transmitters)과의 안정된 통신 링크(광케이블, M/W, 위성 등)을 통해 방송 미디어 패킷 스트림을 내보낸다. ATSC 3.0 표준에서는 방송 게이트웨이와 송신기 간 STL (Studio to Transmitter Link) 구간에 STLTP (STL Transport Protocol)를 정의하고, 멀티캐스트 구조 내에 IP 터널링(Tunneling) 형태로서 BB 프레임과 L1 시그널링 정보, 시간 정보를 싣도록 한다. 본 논문에서는 ATSC 3.0 기반의 방송 게이트웨이의 주요 기능 역할로서 단일주파수망(SFN)을 위한 패킷 스트림 구성 및 이를 위한 기능 구조에 대해 기술한다.