• Journal of Korea Multimedia Society
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• v.23 no.1
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• pp.58-66
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• 2020

5G-based HMD technology grew rapidly in the context of the environment change of convergence technology media and mobile networks in the fourth industrial era. It has also grown into a core technology that transforms our digital visual system. However, there is no research or system that can understand and verify radical visual system changes. Therefore, it is necessary to have an engineering understanding and verification of the diffusion of HMD media imaging devices. Beyond the distinction between virtual and real, research is urgently needed on the new three-dimensional interface of the 21st century through viewer participation. For this reason, research on the algorithm structure of interactive video media using L-System is an essential process and will be a guide to understanding the virtual reality interactive environment.

• Journal of Korea Multimedia Society
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• v.12 no.7
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• pp.953-961
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• 2009

The usage of DRM-applied digital contents reduces user's convenience, thus it leads the many users to avoid using DRM-applied digital contents. In this paper, therefore, we propose the new distribution model in which the users, who purchase the DRM-applied digital contents, can resale freely those contents to the other users. As a result, the proposed model induces the users to distribute contents soundly by including them in one of distribution objects. For the purpose of this, in this paper, we propose that a packaged content and usage rights are transferred to another user by using a method which based on some existing digital ticket or coupon. In addition, the security of the proposed system is discussed for the double transfer, the forgery and the modification of usage rights, and the reproduction of contents and usage rights.

• Journal of Korea Multimedia Society
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• v.24 no.9
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• pp.1299-1310
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• 2021

Under the background of the rapid development of digital educational games, we have to evidently research the elements of the achievement system of children's DEG (Digital Educational Game), and analyze the relations between the elements and make a profound study on the achievement system and its components on the impact of player's attitude. Compared with the existing research, the research contents and methods are innovative and reliable. The results show that players have a positive attitude towards the DEG achievement system, DEG achievement system has important value and role for educational games. Which is made of five elements: symbol, reward, logic, social interaction, and knowledge. The five elements interact with each other and have a positive impact on players' attitudes. DEG achievement system with five elements will bring players a positive experience. These findings provide a detailed study of the components of the achievement system. With all of these, we can explain the role and relationship of the components, and provide new ideas and empirical evidence for the design and development of children's educational game achievement system. The above findings provide a detailed description of the components of the DEG achievement system, explain the role and value of each component, and the relationships and patterns among the components, it provides a new perspective and empirical evidence for the design and development of the children's system DEG results.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.5
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• pp.320-332
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• 2007

Recently, new interests on digital contents and UCC(User Created Content)s are growing fast through the development of internet. However, there have been many side-effects on those interests. The representative problems are perversing illegal copies and the distributions for personal valuable digital contents to unauthorized anonymous users. These decrease creation of good digital contents by interfering with the growth of information technology industry and the content provider#s creative will. To resolve these problems, in the paper, we propose a novel auction system for multimedia contents and bidding processes. The system applies the concept of used goods onto digital contents. Especially, the auction system is based on mobile environment. Finally, the performance evaluation shows that those main auction process algorithms indicate the time complexity of logarithm scale for insertions and searches. Therefore, the performance of the system is not significantly influenced by the amount of contents even though the volume of contents in the system is increasing.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.112-116
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• 2004

인터넷 통신의 빠른 발전에 따라 인터넷은 상거래에서 디지털 컨텐츠의 분배를 위한 가장 효율적인 통신로가 되었다. 현재 이 통신로는 무선 환경으로 넓혀지고 있다. 디지털 컨텐츠의 특성상 불법복제와 유통으로 인한 저작권 침해문제가 발생하였고, 이를 해결하기 위해 DRM(Digital Rights Management)기술을 이용하게 되었다. 이에 본 논문에서는 무선환경에서의 DRM에 대한 기술들을 분석하고자 한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.69-73
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• 2004

일반적으로 스트림 방식의 DRM(Digital Rights Management)시스템은 한번에 하나의 컨텐츠만을 구매할 수 있다 그러므로 다중 디지털 컨텐츠의 구매 시에 매번의 인증, 지불, 라이센스 획득 단계가 필요하다. 게다가 구매한 모든 컨텐츠의 라이센스 키들의 안전한 저장 공간이 필요함으로 라이센스 키 관리의 어려움이 있다. 따라서 본 논문은 Atallah와 Li[1]의 스마트카드를 이용한 라이센스 키 관리 방식의 문제점을 지적하고, 스트림 방식의 DRM 시스템에서 다중 컨텐츠 구매를 위한 효율적인 다중 라이센스(multi-license) 서비스를 제안한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.799-802
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• 2003

컴퓨터 보급 증가와 인터넷 발전으로 다양한 종류와 다량의 디지털 데이터들이 제작, 유포되고 있다. 디지털 컨텐츠는 기존 아날로그 컨텐츠와 비교할 때 생성, 가공, 유통, 분배 등의 측면에서 많은 장점을 갖는 반면, 원본과 동일한 복사본을 쉽게 생성할 수 있는 특징 때문에 디지털 창작물에 대한 저작권 보호가 중요시 본다. 본 논문에서는 디지털 컨텐츠 보호 기술로 각광 받고 있는 DRM(Digital Rights Management)기술에서 컨텐츠 유통 시 개인키가 노출될 경우 비인가자에 의한 컨텐츠 불법접근이 가능해지는 취약성에 대한 개선책으로 PDMS (Publlic-Key Distributed Management System ： 개인키 분산관리 시스템)를 확장 적용하는 방안에 대하여 논한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.82-85
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• 2014

With high speed communication network and supplement of high quality multimedia devices, large demand of multimedia service stimulates digital signing industry to step forward to new opportunities. But in order to provide competitive quality services, Integrated management system is required. Digital signs use technologies such as LCD, LED and Projection to display content such as digital images, video, streaming media, and information. Digital signs rely on a variety of hardware to deliver the contents. The components of a typical digital sign installation include one or more display screens, one or more media players, and a content management server for each player. To improve the existing high cost and less efficient management system, this paper suggest cost effective Integrated Digital Signage Management System with the results of analysis of existing system. Also this paper presents an actual implementation on entertainment company to evaluate the suitability, to prove the result of superior performance of proposed system.

• International journal of advanced smart convergence
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• v.8 no.3
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• pp.184-192
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• 2019

The existing digital signage systems inside the elevators are a lack of tailored contents appropriate to the space and environment inside or outside the elevators. Also, they almost impossible to flexibly respond to various contents disclosure according to the demand of the consumers or the elevator markets. Therefore we design and implement an IoT(Internet of Things)-based smart digital signage system for the safety of elevator passengers.. In order to provide IoT-based information to the smart digital signage within the elevator, we propose an IoT system as a set-top box with gyroscope sensor, acceleration sensor, RFID(Radio-Frequency Identification), fine dust sensor, etc., which processes various data collected by the sensors and provides the elevator passengers with various tailored contents such as elevator driving information, environmental information inside and outside the elevator, and disaster information in addition to simple advertisement information. The proposed IoT system is a set-top box that operates the smart digital signage and has an independent information control processor based on the IoT sensors that do not depend on the elevator control system. For the proposed smart digital signage, it supports an operating system that is independent of the elevator driving service as well as the media service. So the smart signage system has a characteristic that it does not depend on the elevator control system since it is a stand-along IoT-based information control system. With the proposed system providing intuitive content for the surge, steep descent, and radical movements of an elevator due to an emergency situation, the elevator passengers should be able to recognize the situation quickly and respond accordingly. In the near future, the proposed system will expand the market of digital signage applied in conjunction with the development of contents in the disaster, safety and environment fields, and expect expected to revitalize related industries associated with signage.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.231-234
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• 2002

This paper has studied a management system for RCST of the Satellite Multimedia Internet Service through analysing the architecture and specification of BSAN based on Digital Video Broadcasting System. In this paper, designing and implementing RCST DPM and agent system are shown. The UCD-SNMP framework served as base station for implementation of the agent. And the message protocol between RCST DPM and agent system has been also defined to provide a way for interaction.