• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.391-393
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• 2001

본 논문에서는 디지털 멀티미디어 컨텐츠의 효과적인 제작을 위해 멀티미디어 컨텐츠가 다양한 형태의 타입으로 표현될 수 있도록 하는 MPEG-4 컨텐츠 타입 변환기의 설계 및 구현을 제시한다. MPEG-4 컨텐츠 타입 변환기는 멀티미디어 저작 도구인 멀티미디어 Authoring Tool을 위한 핵심 보조 기술이다. MPEG-4 컨텐츠 타입 변환기는 효과적 타입 변환을 위해 MPEG-4, TRIF 및 SMIL을 포함하는 중간포맷을 정의하여 이용한다. 즉, MPEG-4, TRIF 및 SMIL로 정의된 각각의 트리 형태의 데이터와 중간자적인 트리 형태의 중간 포맷 간에 양방향 변환을 가능하게 하여 손쉽게 다양한 타입으로의 변환을 가능하게 한다. 그리고, 각 트리 형태의 멀티미디어 데이터는 그에 해당되는 스트림의 형태로 트레이스 되어 출력되며, 실행 가능한 데이터를 생성하기 위해 Encode와 Mux 또는 파싱을 실행한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.455-459
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• 2006

본 논문에서는 대부분의 데스크탑 컴퓨터 환경에서 브라우저의 플러그인으로 설치되어 컨텐츠를 재생하는 플래시 컨텐츠 양식을 이용하여 휴대용 단말기의 배경 화면으로 사용할 수 있는 컨텐츠 제작 도구와 이를 이용한 휴대용 단말기에 컨텐츠를 제공하기 위한 서비스 구축에 대하여 기술한다. 컨텐츠 저작 도구는 휴대 단말기의 개인화 특성에 기반을 두어, 사용자가 영상, 사운드와 저작 도구에서 제공하는 기능성 아이템, 컨텐츠의 전환 효과, 아이콘 및 텍스트 등을 이용하여 컨텐츠를 구성하고, 자동 생성 도구를 이용하여 모바일 플래시 컨텐츠를 생성한다. 생성된 컨텐츠는 미리보기 엔진을 통해서 휴대 단말기에서의 동작을 에뮬레이션해 준다. 저작된 컨텐츠는 전송 기능을 통해 휴대단말기로 전송되어 배경 화면으로 활용된다. 상기 컨텐츠 저작 도구를 활용해 개발된 서비스 시스템은 현재 상용 서비스 중에 있다.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.55 no.8
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• pp.369-374
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• 2006

Due to development of internet network environments and data compression techniques, the size and amount of multimedia data has greatly increased. They are compressed before transmission or storage. Dealing with these compressed data such as video retrieval or indexing requires decompression procedure in most cases. This causes additional computations and increases the processing time. In various applications a histogram is one of the most frequently used tools. Efficiency of extracting such histograms will drop down if decompression is involved. We propose a novel scheme for extracting histograms from images that are transformed into the compressed domain by 8x8 DCT(Discrete Cosine Transform). In this scheme an averaged version of original image is obtained by a simple linear combination of DCT coefficients with the sets of coefficients we designed.

• Proceedings of the Safety Management and Science Conference
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• 2000.11a
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• pp.1-5
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• 2000

With the advent of the internet era, web-based virtual training system is gaining its importance in recent years. Because of the fact that the training can take place in any place and at any time, the virtual system is now replacing many of the conventional off-line classes. Hardware environments such as communication bandwidth and computer performance gets fast enough to accommodate the virtual education. Based on the observations on current virtual training system, this paper proposes three critical design rules required when developing a new virtual training system: i) With conceptual mapping, the menu hierarchy can be organized in a clear-cut manner, ii) Extensive use of multimedia tools can help students keep their attention to the lecture materials, and iii) Provision of interaction mechanisms helps students to gain their identity and motivation.

• Journal of the Korea Society for Simulation
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• v.8 no.1
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• pp.113-138
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• 1999

Driven by the explosive expansion and acceptance of the Internet and its multimedia front-end, the Web, a new generation of the modeling and simulation tools have come up with the name of Web-Based Simulation (WBS). Most of WBS libraries inherit its powerful advantages from Java. However, there are cases where explicit specification of models or interface objects is more desirable than the black-box programs. This paper presents an XML-based DEVS (Discrete Event System Specification) markup language for sharing simulation models on the Web. DEVS provides a system-theoretic formalism for the language while XML supports platform-independent data access. This paper focuses on the design of such a language.

• ETRI Journal
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• v.26 no.2
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• pp.122-135
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• 2004

Although frame-based MPEG-4 video services have been successfully deployed since 2000, MPEG-4 video coding is now facing great competition in becoming a dominant player in the market. Object-based coding is one of the key functionalities of MPEG-4 video coding. Real-time object-based video encoding is also important for multimedia broadcasting for the near future. Object-based video services using MPEG-4 have not yet made a successful debut due to several reasons. One of the critical problems is the coding complexity of object-based video coding over frame-based video coding. Since a video object is described with an arbitrary shape, the bitstream contains not only motion and texture data but also shape data. This has introduced additional complexity to the decoder side as well as to the encoder side. In this paper, we have analyzed the current MPEG-4 video encoding tools and proposed efficient coding technologies that reduce the complexity of the encoder. Using the proposed coding schemes, we have obtained a 56 percent reduction in shape-coding complexity over the MPEG-4 video reference software (Microsoft version, 2000 edition).

• ETRI Journal
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• v.33 no.3
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• pp.355-365
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• 2011

IPTV broadcast channels and video content distribution are increasingly saturating network paths. New solutions based on inter-domain multicast protocols could contribute to the enhancement of multimedia content distribution over the Internet. The aim of this paper is to propose new capabilities for an existing inter-domain multicast protocol, the Protocol Independent Multicast-Sparse Mode. We describe the modified protocol and analyze its behavior using newly developed tools based on an open-source software simulator. The resulting protocol does not require topology information, which is advantageous for easier deployment. In addition, the adopted solution avoids inherent problems with inter-domain multicast routing, such as multiple paths and path asymmetries.

• Journal of the Korean Chemical Society
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• v.53 no.2
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• pp.166-174
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• 2009

Quantum chemistry has many concepts that are either abstract or counterintuitive, giving students difficulties in understanding them. Fortunately, the advancement of web technologies provides us with hordes of powerful tools to produce rich multimedia web applications that supplement traditional classroom teaching. In this paper we present an approach to address this issue that combines interactive simulations and visualization on the web browser using Shockwave technology. With several examples, we show how to take advantage of the features of the Shockwave technology in developing web-based course material with ease.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.27 no.6
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• pp.551-555
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• 2014

In this paper, framework of weapon effects calculator for hardened targets is presented. Fast running time, validation and easy expandibility are required for weaponeering tools, and these requirements were met by using of physics-based fast-running models or semi-empirical equations for damage prediction and penetrations, and modular architecture. Key concepts and outputs, required functions and corresponding use cases were presented.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.358-361
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• 2001

인터넷의 발전으로 우리는 빠른 시간에 많은 정보를 접할 수 있을 뿐 아니라 웹을 이용한 동적인 개인 신상관리와 교육에서 교사와 학생간에 웹을 이용한 새로운 인터페이스를 열 수 있게 되었다. 형성평가는 교사가 기계적으로 채점하고, 틀렸을 때 이를 교정해 주기보다는 스스로 학습결과의 정답을 확인하고 틀렸을 때 이에 대한 정답을 학생 자신이 찾아내도록 함으로써 형성평가의 과정 그 자체가 학습과정의 일부가 되도록 하여야 한다. 본 연구에서는 멀티미디어저작도구로 형성평가 문항을 만들어, 교사와 학생 모두 빠르고 정확하게 채점하여 즉시 결과를 확인하고 feedback 효과를 얻고자 데이터베이스 연동을 이용한 웹 기반 형성평가 방안을 제안한다.