• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.289-292
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• 2007

FTTH (Fiber to the Home) is constructed with optical devices and optical cables from central office (CO) to subscribers. With FTTH, it is possible to provide service platform in order to meet the customers' emerging demands for more bandwidth/security and diverse IP multimedia applications including high definition (HD) video streaming service. FTTH can provide enough bandwidth from 100Mbps to several Gbps per subscriber. It is also most appropriate network architecture for convergence of communication and broadcasting. So, FTTH is thought the final destination of telecom operators, since it is the fastest and most reliable solution so far and various IP multimedia services are possible through it. In this paper, newly attempted technologies of FTTH construction for apartment complexes using CWDM-PON system are discussed.

• ETRI Journal
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• v.30 no.6
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• pp.765-773
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• 2008

Spatial correlation is a result of insufficient antenna spacing among multiple antenna elements, while temporal correlation is caused by Doppler spread. This paper compares the effect of spatial and temporal correlation in order to investigate the performance of multiuser scheduling algorithms in multiple-input multiple-output (MIMO) broadcast channels. This comparison includes the effect on the ergodic capacity, on fairness among users, and on the sum-rate capacity of a multiuser scheduling algorithm utilizing statistical channel state information in spatio-temporally correlated MIMO broadcast channels. Numerical results demonstrate that temporal correlation is more meaningful than spatial correlation in view of the multiuser scheduling algorithm in MIMO broadcast channels. Indeed, the multiuser scheduling algorithm can reduce the effect of the Doppler spread if it exploits the information of temporal correlation appropriately. However, the effect of spatial correlation can be minimized if the antenna spacing is sufficient in rich scattering MIMO channels regardless of the multiuser scheduling algorithm used.

• Electronics and Telecommunications Trends
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• v.23 no.2 s.110
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• pp.108-118
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• 2008

2006년 6월 독일 월드컵을 기점으로 유럽에서 DVB-H와 지상파 DMB가 상용화된 이래로 중국, 동남아시아, 아프리카 등지에서도 이동 TV 서비스를 시작하려는 노력이 진행되고 있다. 그러나 아직 한국과 일본을 제외한 국가들에서는 이렇다 할 성과를 보이지 않고 있으며 비교적 성공적으로 평가되고 있는 한국과 일본도 무료서비스 모델에 기반하고 있어 서비스사업자들은 여전히 수익원 마련에 어려움을 겪고 있다. 본 고에서는 특히 세계적 추세인 통방융합서비스의 특성을 고려하여, 국내외에서 상용화된 이동 TV 서비스 제공 현황과 국내 DMB 이용자 설문조사 결과를 분석함으로써 전세계적으로 적용 가능한 DMB 성공 요인에 대해 고찰해 보고자 한다. 본 고에서 도출된 DMB 성공 요인은 다양한 환경의 다른 국가들에서 적용 가능할 뿐만 아니라 이동 TV를 구현하는 대부분의 기술방식에 적용할 수 있는 시사점을 제시할 것으로 기대된다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.91-94
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• 2005

디지털 기술의 발전에 따라 방송 통신 융합이 가속화되고 있다. 우리나라는 방송 통신의 융합을 위해 쌍방향성을 제공하는 IP-TV와 같은 서비스가 유선 인터넷망을 사용한 홈오토메이션의 고정 환경 서비스를 중심으로 이루어지고 있다. 그러나 자동차 또는 휴대폰 등의 이동형 디지털 TV에서의 양방향 데이터 서비스 같은 방송통신 융합 서비스를 제공하기 위해서는 유선인터넷과 비슷한 전송속도와 비용을 갖는 무선 인터넷 서비스가 필요하다. 우리나라는 2006년 상반기에 유선인터넷과 비슷한 전송속도와 비용을 갖는 무선인터넷 서비스인 휴대인터넷을 상용화할 예정이다. 휴대인터넷은 동일한 주파수 대역을 이용하여 송수신을 하는 TDD방식을 사용한다. 우리나라는 셀룰러 시스템의 발달로 FDD를 중심으로 부품의 개발과 연구가 진행되어 왔기 때문에 TDD용 부품의 개발과 연구가 필요하다. 본 논문에서는 TDD 기반의 휴대인터넷용 고출력 RF 스위치의 개발에 대하여 기술한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5B
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• pp.324-329
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• 2005

In the traditional telephone services, the settlement method for usage of facilities has been systematically and reasonably arranged based on the cost. Through the advanced technology, the telecommunication services such as the convergence of voice-data, wire-wireless, communication-broadcasting, etc are offering. So, new settlement method in the broadband convergence network (BCN) should be necessary. This paper suggests inter-companies settlement method in the broadband network using interconnection bandwidth and transmission distance factor. By reflecting the facility cost weight on each BCN level, the cost settlement for various services can be easily done. As the settlement model for BCN, the inter-companies interconnection and settlement can be normalized by interconnection bandwidth and transmission distance factors.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.345-351
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• 2010

It has been growing interests that convergence services of broadcasting and telecommunication services such as DMB 2.0 and Mobile IPTV etc. Unicast type is difficult to service broadcasting due to limits of capacity and poor receiving environments, WiBro supports broadcast service with MBS. MBS is transmission method that base stations belong to same the MBS zone transmit the all users who request broadcasting service. Terminals are received resources from all base station in the MBS zone and SINR can be improved because of macro diversity. If terminals are located at edge of the MBS zone, complement algorithm are needed beacause received SINR is very low. In this paper, MIMO STBC, Relay and FFR are introduced to improve the throughputs using high MCS. The basic simulation environment is assumed to be SISO. Transparent relay and FFR applicable on MBS are divided by SISO and MIMO STBC environment and evaluate the performance.

• Journal of Legislation Research
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• no.44
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• pp.103-153
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• 2013

This article aims at the legislation of User-Protection Act in area of ICT. In these days telecommunication and broadcasting are getting more and more convergent. The paradigm of ICT is turning over from the service provider to the end-user. User protection has been in each erea of ICT (C-P-N-D) individually regulated. In the area of telecommunication it is important to protect the interest of user, who stands in contract with the service provider. And in area of broadcasting it is important to protect the interest of viewers, who stands "gratis" with the broadcasters without any contracts. For the more efficient user-protection it is also necessary to make a dedicated organization under KCC(Korean Communications Committee). In this early year the government organization was divided into MSIP(Ministry of Science, ICT and future planing) and KCC. The user-protection act will be very important instrument of ICT regulation in the era of creative economy. It is necessary to establish a new frame act of user protection. It is also necessary to make start to establish a new system of user education in erea of ICT. It is strongly expected the new act will be a turning point of ICT development in Korea.

• Journal of Broadcast Engineering
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• v.27 no.3
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• pp.402-414
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• 2022

Due to the convergence of broadcasting and telecommunication and the evolution into the media industry, viewers are adapting to the reception of content through various platforms and personal media. Accordingly, public broadcasting is seeking to change into public media that redefines public responsibility and establishes a role for a sustainable society. In particular, proving its value in the form of differentiated public services in an environment where public content is also provided by commercial services is necessary for members of society to prove the legitimacy of financial resources and services. In this paper, as the digital broadcasting era in the 2010s and the media industry was reorganized in 2020, changes in public services corresponding to the public responsibilities required of public broadcasters were analyzed through global public broadcasting cases. In particular, since the technical preparation of broadcasters and viewers is essential in the media environment, the technical direction of public services was mainly analyzed. The derived direction is a common direction applicable to all public broadcasters, including Korea. It is expected that the public responsibility and direction of technological development suggested in this paper will clarify the role of public media and help become differentiated services that contribute to life.

• Journal of The Korean Association of Information Education
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• v.14 no.4
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• pp.489-496
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• 2010

Since the specifications of public services in broadcasting-telecommunication convergence environment are not standardized, the public services should be developed and presented by each IPTV service provider, and therefore it is worried that public organizations and IPTV service providers may invest in the public services redundantly, which are managed inefficiently. To resolve those problem, in this paper, the service and network interfaces among multiple public organizations and multiple IPTV service providers and the interactive VOD-type public service providing system of one source multi-use based on ACAP-J are proposed. The proposed system can be utilized in the standard platform of the evolved new public services. And the used technologies can be utilized as a guide for the development of new services.

• International journal of advanced smart convergence
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• v.5 no.2
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• pp.73-79
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• 2016

Remote sensing and measurement are of paramount importance of providing information on the state of water quality in water bodies. The formation and growth of cyanobacteria is of serious concern to in land aquatic life forms and human life. The main cause of water quality deterioration stems from anthropogenic induced eutrophication. The goal of this research to quantify and determine the spatial distribution of cyanobacteria concentration in the water using remote sensing technique. The standard approach to measure water quality based on the direct measurement of the fluorescence of the chlorophyll a in the living algal cells and the same approach used to detect the phycobilin pigments found in blue-green algae (a.k.a. cyanobacteria), phycocyanin and phycoerythrin. This paper propose the emerging sensor design to measure the water quality based on the optical analysis by fluorescence of the phycocyanin pigment. In this research, we developed an method to sense and quantify to derive phycocyanin intensity index for estimating cyanobacteria concentrations. The development of the index was based on the reflectance difference between visible light band 620nm and 665nm. As a result of research this paper presents, an optical biological sensor design information to measure the Phycocyanin parameters in water content.