• The KIPS Transactions:PartC
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• v.11C no.2
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• pp.149-156
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• 2004

Broadcast encryption schemes are applied to transmit digital informations of multimedia, software, Pay-TV etc. in public network. Important thing is that only user who is permitted before only must be able to get digital information in broadcast encryption schemes. If broadcast message transfers, users who authority is get digital information to use private key given in the advance by oneself. Thus, user acquires message or session key to use key that broadcaster transmits, broadcaster need process that generation and distribution key in these process. Also, user secession new when join efficient key renewal need. In this paper, introduce about efficient key generation and distribution, key renewal method. Take advantage of two technique of proposal system. One is method that server creates key forecasting user without user's agreement, and another is method that server and user agree each other and create key Advantage of two proposal system because uses a secret key broadcast message decryption do can and renewal is available effectively using one information whatever key renewal later.

• The KIPS Transactions:PartC
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• v.15C no.6
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• pp.507-512
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• 2008

At a recent, enterprises based on online-service are established because of rapid growth of information network. These enterprises collect personal information and do customer management. If customers use a paid service, company send billing information to customer and customer pay it. Such circulation and management of information is big issue but most companies don't care of information security. Actually, personal information that was managed by largest internal open-market was exposed. For safe customer information management, this paper proposes the method that decrease load of RSA cryptography algorithm that is commonly used for preventing from illegal attack or hacking. The method for decreasing load was designed by Binary NAF Method and it can operates modular Exponentiation rapidly. We implemented modular Exponentiation algorithm using existing Binary Method and Windows Method and compared and evaluated it.

• The Journal of the Korea Contents Association
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• v.14 no.5
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• pp.30-43
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• 2014

The number of online video content distributors are rapidly increasing in N-screen environment. The purpose of this study is to analyze the business model of these distributors, especially Netflix and Hulu. Basis on STOF model, environmental domain, service domain, organization domain and financial domain of each company are analyzed and compared. This study finds that each company's business model had distinct characters in earlier stage. Netflix offered online and offline service in low cost, while Hulu offered up-to-date TV contents without fees. However, two companies' business models are getting similar. The result of this study shows that highly competitive environment and increasing content budget affect two companies to adopt similar business model to survive.

• The Journal of the Korea Contents Association
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• v.14 no.11
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• pp.143-153
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• 2014

The purpose of this study is to investigate the effect of factors related to consumer lifestyle and media usage on the adoption of Nscreen service, which is fundamentally changing both the competitive landscape for business and the daily lives of consumers. The data of 8,524 consumers used in this study were drawn from the first Korea Media Panel Study in 2012 of Korea Information Society Development Institute and the characteristics of adopters and non-adopters were compared. The study also aims to explore the usage pattern of Nscreen as well as antecedent variables that affect the innovative service usage. Logistic regression analysis shows various factors affects the acceptance of this innovation. This is only a first step in the important process of understanding the nature of relationship between consumer lifestyle and the adoption of Nscreen service. Gaining a comprehensive understanding of the drivers of Nscreen usage will help engineers and marketers to develop effective strategies that meet consumer needs for innovative services.

• Journal of Satellite, Information and Communications
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• v.10 no.4
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• pp.64-70
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• 2015

It has been 3 years since the TV broadcasting industry migrated to the UHDTV broadcasting service. Theoretically UHDTV picture quality is four times better than HDTV. UHDTV broadcast has been put to practical use by domestic broadcasters, excluding public broadcasters. The resolution of UHDTV does not correspond to the standard UHDTV values, the viewer have no choice but to watch existing contents on UHDTV. Therefore this paper analyses the current broadcast technology level for the image quality improvement, and to investigate the bandwidth of UHD broadcasts. In this paper we have studied current condition of HDMI interface technology and suggesting Super MHL interface technology capable of performing a successful establishment of the new broadcasting platform in future 8K UHD broadcasts alternatively. In order to improve the UHD broadcasting, we are expecting the development change of UHD broadcasting service user experience.

• The Journal of the Korea Contents Association
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• v.20 no.8
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• pp.114-127
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• 2020

The online performance market is increasing due to recent pandemic events. However, due to the short introduction time of domestic online performances, there is a lack of related prior studies or success stories. In addition, most of these projects are short-lived projects or poor profits, so it is necessary to study how to activate them. The Sac on Screen project, which has been in progress since 10 years ago, has its own imaging experience, and the screening works and screening venues are also diverse, so it is an object of study. In addition, since annual satisfaction surveys are conducted, the business was evaluated based on the voice of customers from the data of the past three years. Based on the analyzed results, a free and paid version of the business model canvas was drawn through a group of experts. As a result of this synthesis, the following major implications were drawn. First, expanding research on online performances, second, needing a sense of responsibility for quality management of content, third, increasing diversity in content selection, and fourth, enhancing the liveliness of online performances, Fifth, efforts are needed to attract private investment and develop value-added products.

• Health Policy and Management
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• v.9 no.1
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• pp.110-138
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• 1999

This study intended to understand the factors influencing the utilization of charged retirement home services for the elderly by stage of discision making. At the same time the purpose of the study is also to present the results of this study as data for the expectation of the demand. The subject of this study was non-utilizer (635 persons) and utilizer (62 persons) of charged retirement home services over the age of sixty. Non-utilizer was selected by random sampling in urban and rural area, and utilizer was investigated by census survey in the three charged retirement home. The research method was interview survey by questionaire. The questionaire was composed of 59 items, 25 variables, 5 components. The research model was to add Andersen's Prediction Model. The components were predisposing component, enabling component, need component, actualizing component, psychologic component. The results of this study were as follows. 1)In the stage of recognizing the residence problem, the recognizer were 76.7% (487 persons) of all the non-utilizer. The factors of influencing were property (B=-4.1E-05), solidarity with children (B=-.1070), house satisfaction (B=-.2517), need of charged retirement home (B=.2614). 2)In the stage of selecting an altenative as utilizing of charged retirement home services, the selecter were 41.1% (261 persons) of all the non-utilizer. The factors of influencing were perception of charged retirement home (B=.2790), need of charged retirement home (B=.2971). 3)In the stage of decion-making, the decider were 29.6% (188 persons) of all the non-utilizer. The factor of influencing was need of charged retirement home (B=.3570). 4)In the stage of the actualization, the factors of influencing were charge ability of utilization (B=.1025), significant others (B=.1868). The upper results were implemented by using the statistical methods of frequency, t-test, $$\chi$^{2}$-test, multiple logistic regression ( and P 〈 .05 ).

• The Journal of the Korea Contents Association
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• v.18 no.8
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• pp.434-445
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• 2018

This study examined whether mobile OTT video service substitutes home TV by using 3 screen data of Nielson-KoreanClick. According to the 2SLS estimation results, when the time spent on mobile OTT video service increased by 1% p, the time spent watching home TV decreased by 12.4%. The results also showed that 1%p increase in the time spent using YouTube app and the mobile OTT video services provided by telecommunication company(Oksusu, Alleh TV, VideoPortal) reduced the time spent on watching terrestrial channels on TV by 16.2% and 23.9%, respectively. The displacement of mobile OTT video service on home TV will be accelerated in the near future. In order to resolve the issue of regulatory unfairness with pay TV services and to safeguard viewer's interests, discussions to establish regulation for OTT video services should be taken place more quickly.

• Journal of Korean Medical classics
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• v.20 no.2
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• pp.269-288
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• 2007

"표유부(標幽賦)"포라료침구경락적기본이론화자오유주침법(包羅了鍼灸經絡的基本理論和子午流注鍼法) 유주팔법등침구임상이론(流注八法等鍼灸臨床理論), 역우기송(易于기송), 통과대차(通過對此)"표유부(標幽賦)"급역대주석가대(及歷代注釋家對) "표유부(標幽賦)" 주석적연구(注釋的硏究). 금득출여하결론(今得出如下結論): 1. "표유부(標幽賦)"중출현적두한경적학술사상(中出現的竇漢卿的學術思想), 시재계승(是在계承)"내경(內經)"화(和)"난경(難經)"적침구학(的鍼灸學), 이론적기본상(理論的基本上), 진일보발전이성적(進一步發展而成的). 대후세침구학적발전산생료중요적영향(對後世鍼灸學的發展産生了重要的影響). 2. 유우폐경적경기유운문혈수출(由于肺經的經氣由雲門穴輸出), 연경락순행체표(沿經絡循行體表), 우시사운문혈구유료통경행기적주치작용(于是使雲門穴具有了通經行氣的主治作用), 고이불설'혈출중부'(故而不說'穴出中府'), 이제출'혈출운문'(而提出'穴出雲門'), 저시두한경재침구이론방면적독도지외(抵是竇漢卿在鍼灸理論方面的獨到之外). 3. 소우침구보사(소于鍼灸補瀉), 인위수지보사법적작용중우호흡보사(인위手指補瀉法的作用重于呼吸補瀉), 제시료순(提示了循), 문, 제(堤), 안(按), 탄(彈), 염, 차, 반(盤), 추, 내(內), 동(動), 요(搖), 조(爪), 절적십사종침자보사수법(切的十四종鍼刺보瀉手法). 4. 제출침자전요관찰확인침구유무이상손상(提出鍼刺前要觀察確인鍼具有无이常損상), 시침전요냉침온난(施鍼前要냉鍼온暖), 시침시요예방절침화피부근육적손상(施鍼時要預防折鍼和皮膚筋肉的損傷), 제출좌수당중이다안침혈(提出左手當重而多按鍼穴), 우수경이서서염전자입적수법(右手경而徐徐捻轉자入的手法), 인위사용쌍수진침위호(인위使用쌍手進鍼위好). 5. 호침가관통경락기혈운행적통로(毫鍼可관通經絡氣血運行的通路), 여오행상응(與五行相應), 인이가평오장지한열(因而可平五臟之寒熱), 가조육부지허실(可調六腑之虛實), 유견사부정지공(有견邪扶正之功), 재구침중응용최위광범(在九鍼中응用最위광泛). 6. 제출침자시요관찰본신(提出鍼刺時要관察本神), 대우'본신'구체가간주시환자적'맥기'화'혈기'(對于'本神'具체可看做是患者的'脈氣'和'穴氣'), 종대적방면간가간주시환자적정신(종大的方面看可看做是患者的精神). 7. 제시료참조전후좌우지혈정확취혈적방법(提示了參照前後左右之血正確取穴的方法), 여참조주변경락확정경락적방법(여參照周邊經絡確定經絡的方法), 병강조요준조골도분촌화굴신수족관절적방법취혈재능취혈정확(병强調要遵照骨度分寸和屈伸手足關節的方法取穴才能取穴正確). 8. 소우두면오관(소于頭面五官).인후경항(咽喉頸項).흉복부(胸腹部), 요배부(腰背部), 부인(婦人) 소아(小兒) 사지등질환(四肢等疾患), 개소료침구치료적경험화심득(介沼了療鍼灸治療的經驗和心得), 제시료자오유주축일안시개혈침법여영구팔법등안시취혈침법(提示了子午流注逐日按時開穴鍼法여靈驅八法等按時取穴鍼法), 성위후세각종안시개혈침법적기초(成위後世各種按時開穴鍼法的基초).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.6105-6110
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• 2012

Smart devices have made our daily life more intelligent and provided convenient life styles in which advanced interface and high speed LTE enable us to have proliferation of empirical Apps. This research has analyzed and evaluated Unstructured data from the users who experienced 'Hair Style Magic Mirror App' by focusing on emotional information. Further this study suggests some directions that the application development industry should take in the near future. The findings through Chi-Square analysis indicate that the application has not affected the overall satisfaction of the consumers; consumers received higher satisfaction in paid version of applications than free versions. Emotional Information analysis shows that users value the practicality of each application the most. Thus, the application developers should focus on practicality and sensitivity side corresponding to the demand of consumers.