• Journal of the Korea Society of Computer and Information
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• v.10 no.2 s.34
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• pp.169-177
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• 2005

The Conditional Access System is a complete system for ensuring that broadcasting services be accessible to only those who are entitled to receive them. Secure key management and efficient delivery mechanism are very important design factors to this system. In this paper, we propose secure and efficient protocols which would be well fitted to a Pay TV system including the satellite DMB. Further. by applying our protocol to the existing conditional access system, we propose a new system that properly enables the control of conditional access to the Pay TV in satellite DMB environment.

• Digital Contents
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• no.4 s.143
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• pp.36-38
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• 2005

국내 케이블TV가 지난달 1일로 개국 10년을 맞았다. 가입자 수나 시청률 등 수치상으로는 놀라운 신장세를 보이며‘뉴미디어의 강자’로 떠올랐지만 아직도 저가 이용료나 뒤쳐진 방송 · 통신 융합 등 내실이라는 측면에선 개선해야 할 구석들이 없지 않다. 오는 2010년이면 아날로그방송이 종료되는 디지털방송 조류에 맞춰 변신을 시도하고 있는 케이블TV업계를 살펴봤다.

• Journal of Broadcast Engineering
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• v.23 no.6
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• pp.824-835
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• 2018

In this study, the impact on the number of cable TV subscribers as well as the profit of cable TV has been examined, and the impact on enlarging the digital broadcast viewing rights of cable TV subscribers and viewers' welfare has also been examined. We investigated the trends in the number of analog and 8VSB subscribers and revenue of cable TV operators by region and analyzed based on changes in the number of channels provided by each operator. The results show that analog subscribers and digital subscribers are delaying their departure through 8VSB conversion, and VOD subscription fees and home shopping transmission fees have a significant impact on operating profit. Subscribers, as they switched over to 8VSB, have become able to view channels of various genres with clear picture quality for a same subscription fee, and the program providers could offer programs to more customers. The government's deregulation policy due to the changes in broadcasting environment led to the facilitation of digital conversion of Pay-TV and improvement of viewers' welfare.

• Journal of Korean Medical classics
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• v.18 no.2 s.29
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• pp.70-84
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• 2005

장석순(張錫純)$(1860{\sim}1933)$시청말민초시기적의가(是淸末民初時期的醫家), 통과대기소저(通過對其所著)${\ulcorner}$의학충중참서록(醫學衷中參西錄)${\lrcorner}$적제오기제삼권중(的第五期第三卷中), 관우(關于)'논간병치법'(論肝病治法)내용적연구(內容的硏究), 소득출적결론시(所得出的結論是), 기대간병적치법가개괄위평간법(其對肝病的治法可槪括爲平肝法), 산간법(散肝法), 화간법(化肝法), 유간법(柔肝法), 진간법(鎭肝法), 염간법(斂肝法), 보간법(補肝法), 완간법등팔법(緩肝法等八法). 평간법인위(平肝法認爲), 인지원기찰근우신, 맹아우간이유약역손(萌芽于肝而柔弱易損), 고불가관파간기(故不可關破肝氣). 차내경중(且內經中)'궐음불치(厥陰不治), 구지양명(求之陽明)'여금궤중(與金櫃中)'당선실비(當先實脾)', 도이서조간기위관건(都以舒調肝氣爲關鍵), 인차이승강탕여배비서간탕등립방(因此以昇降湯與培脾舒肝湯等立方), 차작위평간약중시료계지(且作爲平肝藥重視了桂枝). 산간법인위(散肝法認爲), 간위목장(肝爲木臟), 구유직향이성향상신전(具有直向而性向上伸展), 소이부응기성(所以符應其性), 이용신미산지(而用辛味散之), 즉가위보법(卽可爲補法). 작위산간약(作爲散肝藥), 기선용인진여맥아(其善用茵蔯與麥芽). 화간법시재간체증대(化肝法是在肝體增大), 혹간중유열(或肝中有熱), 혹간기울체(或肝氣鬱滯), 혹옹창시(或壅脹時), 작위산간달울지법(作爲散肝達鬱之法), 사용료시호(使用了柴胡), 유향(乳香), 몰약(沒藥), 차이활혈약당좌약사용적치법(且以活血藥當佐藥使用的治法), 우기중시료삼칠근(尤其重視了三七根). 유간법시근거(柔肝法是根據)'간악조희윤(肝惡燥喜潤), 조칙간체판경이간화간기즉망동(燥則肝體板硬而肝火肝氣卽妄動), 윤칙간체유화이간화간기장영정(潤則肝體柔和而肝火肝氣長寧靜)'적이론(的理論), 인위재치료중가선용당귀(認爲在治療中可選用當歸), 작약(芍藥), 백자인(柏子仁), 현삼(玄蔘), 구기자(枸杞子), 아교(阿膠), 별갑(鱉甲), 단불가장기사용(但不可長期使用). 기진간법시(其鎭肝法是), 재치료경간(在治療驚癎), 전광(癲狂), 현운(眩暈), 뇌충혈제증시(腦充血諸證時), 작위대표처방선용료진간식풍탕(作爲代表處方選用了鎭肝熄風湯). 염간법시근거기(斂肝法是根據其)'범인원기지탈(凡人元氣之脫), 개탈재간(皆脫在肝)'적독특이론(的獨特理論), 이내복탕등작위대표처방진행치료적방법(以來復湯等作爲代表處方進行治療的方法), 차대제양사용료산수유(且大劑量使用了山茱萸). 보간법시재간기허약이실기조달시사용적치법(補肝法是在肝氣虛弱而失其條達時使用的治法), 인위황기시보간적주약. 완간법시의거(緩肝法是依據)‘간고급(肝苦急), 급식감이완지(急食甘以,緩之)'지설이정적치법(之說而定的治法), 인위단미감초시대표약(認爲單味甘草是代表藥).

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.540-543
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• 2006

DTV는 방송 서비스 운영에 가입자 개념을 추가하여 무료방송 외에 정당한 수신료를 지불하는 사람만이 프로그램을 시청할 수 있도록 하며, 그러한 수익을 이용하여 보다 양질의 서비스를 제공할 수 있게 되었다. 가입자간의 구분을 가능하게 해주기 위한 방법이 제한수신시스템(CAS: Conditional Access System)이다. IPTV는 웹 브라우저를 기반으로 동작하며, 방송 콘텐츠라는 기본 TV기능에서 벗어나 T-commerce, E-commerce 등의 다른 도메인으로 사용자의 요구에 따라 자유롭게 이동하며 사용자인증이 요구되기 때문에 기존의 제한수신시스템으로는 그 기능을 다 하기 힘들어졌다. Single-Sign-On은 사용자가 단한번의 인증을 통하여 추가적으로 인증할 필요가 있는 다른 서비스로의 자동적인 인증을 제공한다. 다수의 사용자가 다수의 서비스를 제공받기를 원하는 IPTV환경에서는 단순한 사용자 인증과 접근제어의 기능을 가진 제한수신시스템과 빈번한 사용자인증의 번거로움을 해결할 수 있는 편의성을 제공하는 SSO의 융합은 필연적이라 할 수 있다. 그러므로 Single-Sign-On은 사용자의 요구에 따라 이동하기 쉬운 IPTV 환경에 매우 적합하다. 이 논문에서는 제한수신시스템, SSO, IPTV에 대해 설명하고 제한수신시스템과 SSO의 기능을 통합하여 IPTV환경에 적합한 새로운 인증방안을 제안한다.

• Journal of Korea Technology Innovation Society
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• v.9 no.1
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• pp.131-148
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• 2006

With the rapid penetration of digital technology In recent years, there are growing expectations that many new services will soon become available. One of the new services is 3Dimension(3D) services, because our concern is concentrated on the quality of information that exceeds the digitalization of information. A stereoscopic technique for generating 3D images is contributed to raise the quality of Information and Communication Technology(ICT) service and is extensively applied to various fields. So 3D services, based on that technique, are expected to create a new market for ICT industry and provide significant benefits to consumers. The purpose of this paper is to analyze the consumer preference and evaluate the economic value of the 3D broadcasting service, so it provides propriety of the 3D technology development for market planners and product developers who need to assess the market potential of a product that is not yet available for actual test marketing. And it is useful for decision-makers in considering the provision of 3D services. In this paper, the gang survey was conducted to understand consumer preference of 3D services. And it attempts to apply the contingent valuation method(CVM) to measuring the willingness to Pay(WTP) for the 3D broadcasting service and analyzing the determinants of the WTP.

• The Journal of the Korea Contents Association
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• v.10 no.5
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• pp.229-240
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• 2010

Most of all researchs and analyses in the field of television industry of Korea were related to Cable Television SO(System Operator), but few about PP(Program Provider) from the viewpoint of Industrial Theory in Korea. However, there wasn't a comprehensive research analysis in terms of the co-relationship of the market structure, market conduct and market performance of PP. This research analyzes co-relationship and dynamics of the market structure of PP, its market conduct and market performance in a comprehensive way in Cable TV industry. Especially this paper focuses on the analysis of 1)relationship and its influence between market structure and market conduct, 2) relationship and its influence between their market conducts and market performances and 3) relationship and its influence between market structure and market performance among 40 commercial PPs in terms of the theory of Industrial Organization in Korea. This paper is delated and reported as follows in conclusion : 1)the type of horizontal integration has an effect on the price and scale in the relationship between the structure and its conduct. 2)the price has effect on the revenue and viewing rate between the conduct and performance. And high dependency of the Cable TV license fee has an effect on viewing rate and revenue per subscribers(ARPU) between the conduct and performance. 3)The horizontal integration between the structure and performance had a positive effect on viewing rate and its product differentiation has an effect on the revenue per subscribers. Net cost of the product had a negative effect on the rate of profit.

• Journal of The Korean Society of Grassland and Forage Science
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• v.30 no.1
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• pp.1-8
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• 2010

Few management studies have been conducted on late planting date for corn silage in paddy field as a barley-corn forage cropping system. Experiments were conducted during 2007 and 2008 at the Chungnam Agricultural Research & Extension Services. The objectives of this study were to determine relationships between planting date and com forage yield and to determine the best hybrid at the delayed planting after whole crop barley's harvest. The treatments consisted of 2 planting dates and 7 hybrids. Delayed planting considerately reduced stem diameter, individual ear size and weight. The ratio of dried leaf and culm in aerial plants was increased and that of ear was decreased. The coefficient of variation in fresh, dry matter (DM) and total digestible nutrients (TDN) yield was higher at delayed planting date on cropping system with whole crop barley than that of planting at optimum season. So, fresh weight was reduced by 91.8%, dry matter by 72.6%, grain yield by 51.0% and TDN yield by 68.1%. The appropriate hybrid for delayed planting after whole crop barley harvest in middle region was 'Gangdaok' as lower in the reduction of ear size and weight compared to that of planting at optimum season. Reduction in grain yield caused to decrease the DM and TDN yields. Therefore, to gain stable dry matter in silage corn by delayed planting date on cropping system with whole crop barley was necessary to select com hybrid on the minimum reduction in ear size and weight.