• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.17 no.2
• /
• pp.19-27
• /
• 2007

Broadcasting contents protection system for HDTV has many difficult to apply file encryption technology that using the existing DRM systems. Therefore, this system has to be processed as accommodative about broadcasting contents format such as TS and PS and so on. Also, this system must support efficient encryption technology and random access mode. In addition, this system must have suitable key distribution mechanism in broadcasting environment. In this paper, we propose and implement encryption/key distribution scheme applicable to encoder/decoder without changing the existing MPEG system.

• The Journal of the Korea Contents Association
• /
• v.19 no.11
• /
• pp.1-11
• /
• 2019

The purpose of this study is to examine the effects of different group incentive type on performance under two types of interdependence in a task structure. One hundred twenty college and graduate students were recruited and asked to perform group typing task. Each typing groups organized three members. Participants were randomly assigned to one of four experimental conditions: equally-distributed incentive and differentially-distributed under two different task interdependence. In this study, the dependent variable was the number of correctly typed characters. We found the significant interaction effects between group incentive type and task interdependence. Specifically, under interdependent task, the work performance of participants in equally-distributed group incentive condition was higher than the performance in differentially-distributed group incentive condition.

• The KIPS Transactions:PartC
• /
• v.18C no.4
• /
• pp.227-236
• /
• 2011

IPTV(Internet Protocol Television) is one of the typical businesses which are the convergence of Broadcast and Communication. It provides broadcasting service using IP networks. Recently, IPTV service is developed to Mobile IPTV or Open IPTV. Especially, Open IPTV uses open platform so not only service providers but also general users can provide contents to other users. Open IPTV system has many content providers, so existing security solution of IPTV cannot be adopted. In this paper, we suggest user authentication and key distribution mechanism on Open IPTV. Our proposed mechanism is based on Kerberos, so it can support distribution environment such as Open IPTV. We demonstrate that proposed mechanism can guarantee secure transmission of contents and reduce the delay of user authentication on Open IPTV system compared to other authentication mechanisms. We also compare our proposal and other mechanisms in various aspects, and analyze efficiency and safety of proposed mechanism. As a result, we insist that this mechanism satisfies the security requirements for IPTV.

• The Journal of the Korea Contents Association
• /
• v.17 no.3
• /
• pp.359-369
• /
• 2017

The purpose of this study was to examine whether the effect of feedback would mask the performance differences that would result from different incentive pay distribution. Five critical service behaviors were identified and measured daily at a gas station located in Seoul. Participants were 5 employees working at the gas station. Independent variables were the types of incentive distribution and feedback. After baseline (A), equally-distributed group incentive condition (B) was introduced, and individual incentive condition (C) was introduced in the next phase. Then, after the withdrawal condition (A'), equally-distributed group incentive with feedback condition (B') was introduced and finally, the individual incentive with feedback condition (C') was introduced. The results suggested that all employees showed higher work performance under individual incentive than equally-distributed group incentive system when feedback were not delivered. However, there was no difference in work performance between two incentive conditions in the phases in which feedback were delivered. These findings suggest that feedback can reduce performance differences between equally-distributed group incentives and individual incentives.

• Digital Contents
• /
• no.10 s.125
• /
• pp.106-117
• /
• 2003

정보의 엔트로피 현상에 따라 정보 독접에 대한 논란이 이뤄지고 있다. 특정 소프트웨어에 대한 독점 문제는 정보의 독점까지 확대되기 때문에 대안으로서 분배구조의 재형성에 대한 논의가 이뤄지고 있는 것이다. 독점을 가능하게 하는 디지털 기술은 다양성을 가진다. 하나의 콘텐츠에 대해서 가질수 있는 관점과 응용할 수 있는 분야가 무제한적으로 제시되기 때문에 디지털 기술은 상상이상의 현실이라고 할 수 있는 것이다.

• The Journal of the Korea Contents Association
• /
• v.17 no.7
• /
• pp.371-383
• /
• 2017

The aim of this paper is to investigate adjusting process of trade-off relationship between economic growth and income distribution in China which is established by mixed with social and market-oriented economic systems. The characteristic nature of social welfare index in urban and rural regions in China is examined by employing principal component analysis. Empirical evidences reveal that unlike national wide or urban region, the increases of income contribute to improve social well-being in rural region, but not social welfare index. Accordingly, it can be said that although social well-being in rural region seems to be harmful because of weakly organized social welfare index, the potentiality exists to improve social well-being by increased income. Taken all together, the results signifies that the mixed economic system such as China might distribute its increased income appropriately, however, the distributional system is hardly operated to improve social welfare index. And thus the distributional system has to be amended to enhance social well-being in China.

• The Journal of the Korea Contents Association
• /
• v.11 no.1
• /
• pp.422-428
• /
• 2011

This paper presents results from the theoretical analysis of the lateral load distribution for a railway bridge designed with PSC girders which is one of most popular types of bridge in Korea. Typically, 3 sets of intermediate cross beams within a span have been installed for lateral load distribution. In this paper, the effect on the lateral load distribution by the number of intermediate cross beams were examined by both simple grillage analysis and finite element method. This study showed that at least, one set of cross beams at midspan should be needed to ensure the proper load distribution. However, the effect of cross beams on the load distribution becomes not significant though more than one set of cross beams are installed. Therefore, only one set of cross beans at midspan is recommended for constructibility and economic efficiency.

• Journal of Internet of Things and Convergence
• /
• v.5 no.2
• /
• pp.21-26
• /
• 2019

Wisdom contents is made by an ordinary person and contains life tips helpful in general. As the existing copyright management systems are designed for the corporate or professional authors, it's not easy to use and requires high cost for the ordinary person to get the copyright. Blockchain based system can notarize the block of transactions without help of trustful third party such as existing copyright protection center. Thus, blockchain based copyright protection model is needed to protect the ordinary author's copyright. In this study, we propose the smart contract based copyright protection model which run on the blockchain network. The proposed model consists of smart contract creation, contents purchase and profit sharing stages. The digital signature scheme is used to get the contract agreed by the seller and the author. The smart contract stores the author information, contents information and the percentage of the share as states. If the contents is sold, the sales tokens are redistributed to the author and the seller according to the share. The proposed model can be applied to the ordinary person's copyright registration and management for Wisdom contents distributed in cafe, blog, YouTube, etc.

• 한국경영정보학회:학술대회논문집
• /
• 2008.06a
• /
• pp.1055-1065
• /
• 2008

인터넷의 발전과 보급으로 대용량 데이터전송이 가능해짐에 따라 디지털 콘텐츠 이용이 급격히 확산되고 있다. 이에 따라 디지털 콘텐츠관련 유통시장의 규모도 지속적으로 성장하고 있는 추세이며 우리나라를 비롯하여 선진국가들은 디지털 콘텐츠산업에 대해 관심을 가지고 선점을 위한 노력을 기울이고 있다. 이중 유통되는 수많은 디지털 콘텐츠를 식별하는 메터데이터 표준의 설정은 중요한 이슈중 하나이다. 한국정보사회진흥원(NIA)은 국내 디지털 콘텐츠산업 발전을 위한 유통인프라로써 UCI(Universal & Ubiquitous Content Identifier) 표준식별체계를 개발하여 보급하고 있으며 2008년 현재 SBSi를 비롯한 9개 공공 및 민간기관들이 UCI를 적용하여 디지털 콘텐츠를 서비스하고 있다. 본 연구는 UCI를 적용한 9개 기관의 적용사례에 대해서 도입배경과 필요성, 의사 결정과정 및 기대효과 등 다양한 관점에서 분석을 실시하였다. 이를 통해서 디지털 콘텐츠 관련 기업의 식별체계 도입 및 활용과 관련한 의사결정 및 디지털 콘텐츠 정책 추진에 주요 시사점을 제공하고자 한다.

• The Journal of the Korea Contents Association
• /
• v.4 no.3
• /
• pp.53-60
• /
• 2004

In this paper we present user authentication and key distribution using threshold PKC(Public Key Cryptosystem), which is secure against the dictionary attack. The n servers hold a t-out-of-n sharing of the dealer's secret key. When the server authenticate a user, at least f of them cooperate they can reconstruct password verifier.