• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.1170-1172
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• 1996

Analog-digital converter boards for use in personal computers have recently being improved markedly, many kinds of high speed(1 MHz - 10 MHz sampling rale) and over 12-bit vertical resolution A/D boards released. It can be applicable to high frequency magnetic measurements. In measurement of magnetic properties of high frequency, digitizing oscilloscope or trasient recorder are being used. but, those price are often expensive, we constructed PC controlled A-C B-H loop tracer that can measure Bs, Br, He, permeability and may be applied about 100 Hz - 20 kHz range. it use IBM PC compatible 1 M Sample/s, 12 bit A/D converter board with SSH(Simultaneous Sample and Hold).

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1375-1378
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• 2008

아날로그방송 중단을 앞두고 케이블방송은 디지털 CATV 로 전환하기 위해 노력 중이다. 이를 위해 케이블방송은 단순히 방송의 디지털화 뿐만 아니라, PPV(Pay Per View), PVR(Personal Video Recorder), VOD(Video On Demand) 와 같은 서비스를 가입자에게 제공하기 시작했다. 이와 같은 서비스들은 대부분 유료서비스로 가입자의 수신권한을 확인하기 위해 다양한 종류의 CAS(Conditional Access System)를 사용하고 있다. 2008년 관련법의 정비와 함께 IPTV(Internet Protocol TV) 시범서비스가 시작 되었는데, IPTV 역시 실시간 방송, VOD 서비스를 기본 서비스로 규정하고 있기 때문에 CAS 의 사용이 필수적이다. 본 논문에서는 디지털 CATV 와 IPTV 에서 사용하는 수신제한시스템을 분석하고, 가입자와 방송사업자 모두에게 도움이 되는 발전방향이 무엇인지 제시하고자 한다.

• IEMEK Journal of Embedded Systems and Applications
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• v.3 no.4
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• pp.229-234
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• 2008

The 'Anytime, Anywhere' services have been the biggest topic in the recent digital broadcasting research area. The related applications for the Anytime and Anywhere Services are as follows: the personalized broadcasting based on the PVR (Personal Video Recorder) for the Anytime Services, and the DMB (Digital Multimedia Broadcasting), the mobile devices supporting the wireless network and the Second TV and so on for the anywhere services. The personalized broadcasting has been researched on the one of the killer applications in the various broadcasting environment - the ground wave broadcasting, the satellite broadcasting, IPTV and CATV broadcasting suchlike. The applied contents of the personalized broadcasting have advanced from the main contents for the broadcasting to the interstitial contents like advertisements and coupons, the personalized interstitial broadcasting needs to develop the technology about the generation, storing and management of the interstitial metadata. but, the personalized broadcasting has the limitation that the TV environment is somewhat difficult to support the personalized broadcasting individually, because all family usually share the main TV at home. The Second TV is possible to solve the environmental limitation. This paper designs and develops the static set top box at home, the Second TV and their multimedia streaming techniques for the personalized broadcasting of the contents including the interstitial contents.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.2B
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• pp.59-68
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• 2008

In order to activate the digital broadcasting in Korea, the analog broadcasting will have been closed down until 2012. Recently IPTV(Internet Protocol TV) thorough internet has been regarded as the fourth media following the terrestrial, satellite, and cable for the digital broad casting. And it has been the important medium for the communication and broadcasting system. However IP is not easy to replace the entire broadcasting system with the digital - type broadcasting system. For the digital broadcasting, we should replace all TV sets, install the settop-boxes to receive the various IP media, solve problems about time delaying when changing channels, and support communication and broadcasting consolidation service for such as PVR and Network CCTV. IPMG is the digital converter that is able to solve these problems. In this paper, I'll develop and analyze IPMG converter's performance which sends and receives both the analogue and digital broadcasting signals through various media gives the Network PVR service.

• Journal of Broadcast Engineering
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• v.9 no.4 s.25
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• pp.345-356
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• 2004

In this paper, we present a design and implementation of a personalized broadcasting system using TV-Anytime metadata for providing personalized services. The TV-Anytime specifies metadata schema, metadata coding and delivery, and provides service models to provide personalized broadcasting content services at anytime when users want to consume using metadata, which includes ECG (Electronic Content Guide) and content descriptive information in a PDR (Personal Digital Recorder)-centric environment. The proposed personalized broadcasting system consists of a server that provides metadata binary-coding, encapsulation and multiplexing, and a client terminal that takes charge of de-multiplexing, metadata decoding, and metadata processing for personalized content accessing and consumption. This paper presents the details of the design of each functional module, and the evaluation results with a set of service scenarios in an end-to-end broadcasting test-bed.

• The KIPS Transactions:PartC
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• v.11C no.6 s.95
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• pp.731-738
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• 2004

With the increase of digital content usages, the protection for digital content and intellectual property becomes more important. The DRM(digital rights management) technologies are applicable to protect not only any kind of digital contents but also intellectual property. Besides such techniques are required for recorded digital broadcasting contents due to introduction of digital broadcasting techniques and storage devices such as personal video recorder. The conventional protection scheme for broadcasting content is the CAS(conditional access system) by which the access of viewer is controlled on the specific channels or programs. The CAS prohibits the viewer from delivering the digital broadcasting content to other person, so it results in restriction of superdistribution on the digital broadcasting content. In this paper, for broadcast targeting unspecfic many people, we will design the service model of the protection and distribution of digital broadcasting content using encryption and license by employing the concept of DRM. The results of implementation are also shown to verify some functions of each component. An implemented system of this paper has some advantages that the recording of broadcast content is allowed on set-top-box and superdistribution is available by consumer. Hence it provides content providers and consumers with trustworthy environment for content protection and distribution.

• Journal of Broadcast Engineering
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• v.11 no.3 s.32
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• pp.284-301
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• 2006

In this paper, we present a design and implementation of a TV-Anytime metadata authoring tool for providing personalized data-broadcasting services. The TV-Anytime specifies metadata schema, metadata coding and delivery, and provides service models to provide personalized broadcasting content services at anytime when users want to consume using metadata including ECG (Electronic Content Guide) and content descriptive information in a PDR (Personal Digital Recorder)-centric environment. In spite of a useful services based on TV-anytime metadata, the metadata authoring still remains as a harassing and time consuming task. For easy metadata authoring, the proposed metadata authoring provides the following key functionalities: metadata visualization, media access, and semi-automatic method for editing segment related metadata.

• Journal of Broadcast Engineering
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• v.10 no.3
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• pp.422-435
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• 2005

Compared with analog broadcasting, digital broadcasting supports technical background to provide personalize the TV watching environment by offering broadcasting services that can adapt to viewers' preferences. However, current digital broadcasting shows limited services such as reservation recording, simple program guiding with an electronic program guide (EPG) on a personal video recorder system, and primitive data broadcasting by broadcasters. Therefore, the purpose of this paper is to suggest a new broadcasting environment which gives a person facility and a difference fur watching TV by serving enhanced personalized services. For that reason, we propose an intelligent broadcasting system which can minimize viewer's actions, and enhanced broadcasting services which are based on understanding of the semantics of broadcasting contents. To implement the system, agent technology as well as the MPEG-7 and TV-Anytime Forum (TVAF) are employed. For content-level services, real-time content filtering and personalized video skimming are designed and implemented. To verify the usefulness of the proposed system, we demonstrate it with a test-bed on which content-level personalized services are implemented.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.20 no.5
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• pp.17-22
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• 2002

만약 사용자가 원하는 멀티미디어 콘텐츠를 원하는 시간에 TV를 통해서 볼 수 있게 된다면, 다시 말해서 보고 싶을 때, 보고 싶은 방송을 포함한 멀티미디어 콘텐츠를 원하는 시간에 바로 볼 수 있게 된다면 사용자는 방송시간에 맞추어 TV를 보지 않아도 되고 원하는 콘텐츠를 검색하느라 시간을 보낼 필요도 없어질 것이다. 예약 녹화의 경우에는 시간정보를 가지고 미리 예약을 해야 하는 경우이므로 이와는 다른 경우라 하겠다. 이러한 서비스는 바로 디지털 콘텐츠와 이를 가정에서 저장할 수 있는 장치의 발달이 바탕이 되고 있다.(표 1 생략, 원문이미지 참조) 표 1은 영국의 BBC사에서 1998년에 조사한 자료로 디지털 멀티미디어 데이터를 저장하고 재생할 수 있는 저장장치의 가격과 용량의 전망을 나타낸다. 여기에서 데이터는 5.5 Mbps급의 MPEG-2 스트림을 기준으로 하였다. 표 1에서 보수적 견해는 매 18개월마다, 현실적 견해는 매 10개월마다 동일 가격의 용량이 2배가 되는 것으로 계산한 것이다. 여기서 보듯 저장장치의 가격 대비 성능이 갈수록 나아지고 있어 가정에서 멀티미디어 콘텐츠를 저장할 수 있는 가정용 서버의 등장이 멀지 않았음을 보여준다. 1999년 가을에 활동을 접은 DAVIC의 마지막 활동이 바로 이러한 저장장치를 이용한 "TV Anytime Service"였다 . Anytime Ser vice란 저장장치를 통해 사용자가 원하는 콘텐츠를 저장해 놓았다가 사용자가 원하는 시간에 언제나 볼 수 있다는 개념이다. 이를 소비자관점에서 보면 Personalized service라고 할 수 있다. 이어 1999년 여름에 창설이 된 "TV Anytime Forum"이라는 단체에서 이러한 저장장치를 이용한 서비스를 위한 환경을 구축하고 있다. TV Anytime Forum은 가정에서 저장장치가 있는 단말인 PDR(Personal Digital Recorder)을 이용한 서비스, 즉 Anytime Service 위한 응용을 가능하게 하기위한 콘텐트 개발자에서부터 가전기기에 이르는 분야에서 Interoperable한 규격을 만들어 보자는 것이 그 목적이다. 특히 여러가지 디지털미디어 전달방식, 예를 들어 DVB, ATSC, ARIB 등에 독립적인 규격을 만드는 것을 원칙으로 하고 있다. 1999년 7월에 첫 번째 회의를 하면서 설립이 되었다. 2001년 말 기준으로 BBC, NHK, Microsoft, Sony, IBM, Phillips, NTT, Intel, Canal+, Tivo, 대우전자, 삼성전자, LG전자, KETI, ETRI 등 콘텐츠 사업자, 방송업자, 네트웍 사업자, 가전업체, 소프트웨어 개발회상에 이르기까지 총 157개 회원사로 구성되어 있으며 년 6회 회의를 개최한다. 2000년 11월에는 서울에서 회의를 개최하였으며 2003년 6월에 다시 한국에서 개최하기로 확정되어 있다. 본 글에서는 이러한 Anytime Service 환경이 구축되었을 때의 각 산업별로 얻을 수 있는 이득에 대해서 알아보고 TV Anytime Forum의 각 Working Group들의 작업 내용들, 그리고 지난 1월에 열렸던 15차 회의의 결과들에 대해서 살펴보고 국내의 TV Anytime 활동에 대해서 간단하게 소개하고 마치도록 하겠다. 현재 디지털 방송기술, 비디오 스트리밍 기술이나 MPEG 등과 같은 기술수준으로도 충분히 이러한 서비스를 시작할 수 있으며 소비자들도 이러한 욕구를 서서히 느끼고 있다. 정보와 서비스를 선택할 수 있게 만들자는 목표를 설정하고 있다. 이러 목표는 통신$.$컴퓨터$.$멀티미디어 기술발전으로 가능하게 되었다.