• Journal of Broadcast Engineering
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• v.28 no.2
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• pp.213-229
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• 2023

In this paper, we introduce a spatial sound rendering system that provides 6DoF spatial sound in real time in response to the movement of a listener located in a virtual environment. This system was implemented using MPEG-I AEP as a development environment for the CfP response of MPEG-I Immersive Audio and consists of an encoder and a renderer including a decoder. The encoder serves to offline encode metadata such as the spatial audio parameters of the virtual space scene included in EIF and the directivity information of the sound source provided in the SOFA file and deliver them to the bitstream. The renderer receives the transmitted bitstream and performs 6DoF spatial sound rendering in real time according to the position of the listener. The main spatial sound processing technologies applied to the rendering system include sound source effect and obstacle effect, and other ones for the system processing include Doppler effect, sound field effect and etc. The results of self-subjective evaluation of the developed system are introduced.

• Trans-
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• v.5
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• pp.1-27
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• 2018

What is 'analyzing a movie'? And, what is 'its role in film studies'? The question required a systematic and scholarly answer, and filmologie was making a clear place for itself. Through psychology, aesthetics, text theories and of course semiotics, the conceptualization of 'film' has been formed. Deleuze, who has been continually writing about 'movies' in his philosophical essays, ended the debate in defining the relationship between 'image and essence' when he released 《Movie 1, Movement-Image》 in 1983. 'Film' rapidly became the topic of the century and became a 'device' that leads the way of thinking. The reason why Jean-Louis Boissier labeled this 'film' as 'device (le dispositif)' was not part of film studies. What should be noted is that the mention of 'film' became a key part of the debate of 'reproduction', which was the most popular subject of philosophy and humanities. In the digital era, the film is once again questioned about its definition. In retrospect, themes of core debates of 'History of cinema' have always been driven by simple and superficial technological changes. With the emergence of CG (Computer Graphics), the question of 'cinema' in the 21st century is not only a philosophical discussion on the problem of 'reproduction', but also a crucial change that shifted the focus of the debate on the nature of the film from 'production' to 'distribution'.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.43-48
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• 2018

This study was conducted to reproduce digital colour based on the lightness of the background and size of the colour stimulus so that colour can be similarly perceived under different conditions. With the evolution of display technologies, display devices of various sizes can now reproduce more accurate colour and enhanced images, thus affecting the overall quality of display images. This study reproduced digital colour by considering the visual characteristics of the digital media environment. To accomplish this, we developed a colour appearance model which distinguishes the properties of foveal and peripheral vision. The proposed model is based on existing research on the lightness of the background and size of the colour stimulus. Based on experimental results, an analysis of variance was performed in order to develop the colour appearance model. The algorithm and modelling were verified based on the proposed model. In addition, to apply this model to display technologies, a practical colour control system and a method for handling complex input images were developed. Through this research, colour conversion errors which might occur when the input image is converted to fit a specific display size are resolved from the perspective of the human visual system. As a result, more accurate colour can be displayed and enhanced images can be reproduced.

• The Journal of the Korea Contents Association
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• v.19 no.9
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• pp.535-549
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• 2019

The purpose of this study was to examine what kind of images were presented on movie stars in the newspaper. For the purpose, we classified the time period according to the movie industry and media trend, selected representative stars by period, and collected 798 related articles reported in newspapers. As a result of analyzing the reporting trend, domestic and foreign topics, news format, and gender difference in collected movie star articles, it was found that the image of movie stars reproduced in newspaper articles had mostly neutral images that do not represent specific gender. Since the 2000s, news coverage was changed to reproduce various images rather than being fixed to particular images, and the subject of report became more diversified through comparison of domestic and foreign topics. In addition, articles in the form of book review decreased and the interview-type articles increased in number, and in the case of male movie stars, the proportion of articles based on works was high in comparison to female movie stars. This study has significance in that it explored the changes in the process of reproducing star images diachronically from the initial stage of stars to the modern times. And it is hoped that this study will serve as basic data for the follow-up studies on the process of reproducing various images in the multi-media era.

• Journal of the Korean Society for information Management
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• v.13 no.2
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• pp.189-221
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• 1996

Copyright is challenged by the rapid development of digital technology. This study investigated a number of new copyright-related issues : electrocopying, digital transmission, legal definition of multimedia, moral right, fair use et al. To use copyright works we need licensing of rights and permissions. Then at this paper we examined the scopes and contents of permission with copyright owners or publishers, also considered relationships of copyright owners with distributors and end-users. Finally, to protect rights of copyright owners and use freely copyright works, we suggested introduction of 'collective management system of copyright' and construction of 'copyright management information system' .

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.820-822
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• 2012

최근 모바일 기기의 보급이 일반화됨으로서 모바일 영상을 다루는 많은 응용프로그램이 개발되고 있다. 모바일 영상을 분석하여 정보를 추출한 결과를 인터넷 검색의 키워드로 연계함으로서 직관적인 멀티미디어 검색을 가능하도록 한다. 본 연구는 모바일 영상에 포함된 한글 문자영역을 검출하는 방법을 제안하였다. 한글 문자의 기하학적인 특징을 추출하고 이를 분석함으로서 후보 한글문자 영역을 검출하고, 검출된 후보 문자영역을 한글 자소 병합 알고리즘을 이용하여 병합한다. 그리고 후보 문자 영역을 한글 6가지 한글 문자 유형 특징을 이용하여 한글 문자 영역을 판별함으로서 최종적인 한글 문자영역을 검출한다. 실험결과, 문자영역 검출률의 성능 평가 요소로서 재현률이 향상됨을 알 수 있었다.

• The Journal of the Korea Contents Association
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• v.9 no.2
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• pp.173-180
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• 2009

In the recent past, the impression expressed by a human body expanded from that of aesthetic beauty to deformed organic medium influenced by environment. And the advancement in digital technology had made it possible to represent the deformed and distorted images of human body more realistically. Consequentially, these exaggerated physical images leave audiences with a feeling of grotesqueness. Chris Cunningham is a British director who mainly focuses on grotesque body as his subject matter using digital media. This paper will explore Chris Cunningham's work and his final goal through analyzing his carnivorous, uncanny grotesque body images, making use of the figital media, at each of his different levels.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11c
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• pp.1713-1716
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• 2002

HyREX는 연구용 프로토타입 XML 하이퍼미디어 문서 검색시스템으로 다국어를 지원하고 있다. HyREX는 검색을 위한 효율적인 접근 경로들을 처리하는 물리적 계층 HyPath와 질의어를 처리하는 논리적 계층 XIRQL 그리고 사용자 인터페이스인 HyGate 계층으로 이루어져 있다. 이 연구에서는 영어와 독일어 등의 검색을 지원하는 기존의 HyREX 시스템을 한글 XML 문서 검색시스템으로 확장하기 위해 먼저 한글 데이터타입을 위한 클래스를 구현하였다. 앞으로 한글 XML 문서 검색에서 정확율과 재현율을 향상하기 위해 각 문서의 인덱스에 대해 $tf{\cdot}idf$ 공식을 이용하여 가중치를 부여하고 이를 개발하고자 한다.

• IE interfaces
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• v.18 no.3
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• pp.333-342
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• 2005

In this paper, we propose an efficient forecasting methodology of the mid and long-term frequency demand in Korea. The methodology consists of the following three steps: classification of basic service group, calculation of effective traffic, and frequency forecasting. Based on the previous studies, we classify the services into wide area mobile, short range radio, fixed wireless access and digital video broadcasting in the step of the classification of basic service group. For the calculation of effective traffic, we use the measures of erlang and bps. The step of the calculation of effective traffic classifies the user and basic application, and evaluates the effective traffic. Finally, in the step of frequency forecasting, different methodology will be proposed for each service group and its applications are presented.

• Electronics and Telecommunications Trends
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• v.30 no.3
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• pp.64-73
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• 2015

최근 위성통신은 물리계층의 고속 모뎀, 링크 계층에서의 고효율 패킷처리 기술 등의 발달로 양방향 광대역 멀티미디어 통신 서비스를 제공할 수 있는 기반을 마련하였다. 그러나 긴 전송 지연시간과 유선망에 비해 여전히 높은 패킷 손실률을 갖는 위성링크 고유의 특징은 현재 통신을 위해 가장 많이 사용하는 전송계층 프로토콜인 TCP(Transmission Control Protocol)를 여전히 위성망에서 제대로 동작시키기 어렵게 만들고 있다. 이에 본고에서는 위성망에서 TCP가 갖는 문제점을 해결하기 위해 도입된 PEP(Performance Enhancing Proxy) 기술에 대해서 관련 표준문서에서부터, 다양한 PEP 구성형태, 그리고 응용계층, 전송계층, 네트워크 계층에 따라 각각 적용된 PEP 주요 기술들을 살펴보고, 더불어 해외의 주요 PEP 제품들의 특징들을 분석함으로써 PEP 관련 전반적인 기술동향을 살펴보고자 한다.