• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.319-322
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• 2002

MPEG-4 파일 포맷은 사용자에게 다양한 기능을 제공하고 다수의 데이터를 유연성있게 제어하기 위해 많은 양의 메타데이터를 정의하고 있고, 이에 접근하는 서버와 로컬 시스템은 이들 메타데이터를 분석하는데 오랜 시간을 소비해야 한다. 본 논문은 이런 분석 지연을 없애기 위해 MPEG-4 파일에서 메타데이타를 실시간으로 분석하여 초기 지연 시간을 줄이는 방법을 제시하며, 그 결과를 보인다.

• Journal of Korea Multimedia Society
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• v.18 no.9
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• pp.1098-1104
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• 2015

With the widespread use of smartphones and IoT (Internet of Things), data are being generated on a large scale, and there is increased for the analysis of such data. Hence, distributed processing systems have gained much attention. Hadoop, which is a distributed processing system, saves the metadata of stored files in name nodes; in this case, the main problems are as follows: the memory becomes insufficient; load occurs because of massive small files; scheduling and file processing time increases because of the increased number of small files. In this paper, we propose a solution to address the increase in processing time because of massive small files, and thus improve the processing performance, using the Reuse JVM method provided by Hadoop. Through environment setting, the Reuse JVM method modifies the JVM produced conventionally for every task, so that multiple tasks are reused sequentially in one JVM. As a final outcome, the Reuse JVM method showed the best processing performance when used together with CombineFileInputFormat.

• The Journal of the Korea Contents Association
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• v.2 no.3
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• pp.105-112
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• 2002

MPEG-4 is an international standard for interactive multimedia data that is used for next generation audio-visual service. It presents an two types of storage formal such as XMT (eXtensible MPEG-4 Textual fount) and MP4 file format D store the interactive multimedia contents. The XMT, a textual format, has advantage of readability and it can be used in many applications since designed based on the XML In this paper, we present the way how to author the MPEG-4 contents using XMT.

• The KIPS Transactions:PartC
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• v.12C no.2 s.98
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• pp.175-182
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• 2005

This paper presents encryption techniques for digital right management solutions of MPEG-4 streams. MPEG-4 is a format for multimedia streaming and stored in the MPEG-4 file format. We designed three kinds of encryption methods, which encrypt macro blocks (MBs) or motion vectors (MVs) of I-, P-VOPs (Video Object Planes), extracted from the MPEG-4 file format. We used DES to encrypt MPEG-4 data Based on theses three methods, we designed and implemented a DRM solution for an Internet broadcasting service, which enabled a MPEG-4 data streaming, and then compared the results of decryption speed and quality of rendered video sequences to get an optimal encryption method.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.55 no.2
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• pp.72-74
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• 2006

In this paper, a wireless multimedia service interacting with key input of a phone number is Presented. In the conventional handset, when the key button is pressed, numbers are displayed or the embedded sound is played. Also, the contents are fixed and cannot be changed. In this paper, we propose a wireless multimedia service playing multimedia contents in accordance with the key input of a phone number. The contents can be downloaded from the wireless internet server. To implement this service, file format, fast codec and download structure are proposed. Using the presented structure, this service is being provided by a telecommunication company in Korea. Various applications based on this service are being expected.

• Journal of Korea Multimedia Society
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• v.12 no.10
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• pp.1397-1406
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• 2009

This paper propose the "Digital Format Registry(DFR)" to solve the problem related digital objects preservation system in the Korean Industry. Digital format registry is a kind of database that saves syntax and meaning informations of a digital file format and for giving help to make preserve in long-term even technical environment of a specific application has been changing. The role of the Technical Information Registry has been developed in this research and development is maintaining a technical information that is the foundation to maintain the long-term preservation and access to a digital objects. The function that can extract text information from a digital document object is implemented in DFR as a basic function at the first time in the world. This function make information consumers search a information that is needed easily and conveniently and can be used for development more effective records management system with retrieving the Key(index).

• Journal of Broadcast Engineering
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• v.16 no.3
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• pp.542-551
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• 2011

Recently an extension to DMB-AF (Digital Multimedia Broadcasting Application Format) standard was proposed in [1] without sufficient validation for industrial application due to incomplete implementation. The extended DMB-AF can include stereoscopic video and stereoscopic images for interactive service data, i.e., MPEG-4 BIFS data, in addition to the existing 2D video and 2D images for BIFS services. The contents in the extended DMB-AF can provide a temporal mixture of 2D/3D video presentations possibly with or without 2D/3D images for BIFS services. In this paper we developed DMB-AF player software that can play the extended DMB-AF files and authored several test files for its verification. As a result, we introduced a new method for indicating dependencies of 3D media tracks to improve the extension in [1] and validated the extended DMB-AF with the improvement.

• Speech Sciences
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• v.5 no.1
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• pp.35-47
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• 1999

This paper describes procedures to model and synthesize emotional speech in a multimedia environment. At first, procedures to model the visual representation of emotional speech are proposed. To display the sequences of the images in synchronized form with speech, MSF(Multimedia Speech File) format is proposed and the display software is implemented. Then the emotional speech sinal is collected and analysed to obtain the prosodic characteristics of the emotional speech in limited domain. Multi-emotional sentences are spoken by actors. From the emotional speech signals, prosodic structures are compared in terms of the pseudo-syntactic structure. Based on the analyzed result, neutral speech is transformed into a specific emotinal state by modifying the prosodic structures.

• Journal of Korea Multimedia Society
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• v.12 no.7
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• pp.989-996
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• 2009

Recently, use of the GIS (Geographic Information System) for the disaster of the urban inundation is increasing. The digital disaster map is the system which analyzes the occurrence area of inundation in the past and forecasts the flood areas by the hydrology method. The development of the system which simulates the flood forecast area by the SWMM(Storm Water Management System) and hydrology method and displays the danger areas is required for the construction of the inundation forecast system. And the spatial database which contains information of the urban facilities such as the street and building and the sewer system such as the manhole and drainage and the result of the hydrology analysis is constructed. In this paper, we propose the method for transforming the Shape File in ESRI into the Oracle spatial database to construct the spatial data for the drainage systems and urban facilities using the Shape File format in the ESRI. We suggest the algorithm for the transformation of the data format, and develop the prototype system to display the inundation area using the spatial database.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1451-1454
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• 2003

본 논문에서는 MPEG-21 에서 정의한 디지털아이템의 파일 포맷의 구조 및 방법을 멀티미디어 파일 포맷으로 제안하였다. 제안한 방법은 디지털아이템을 이진화하는 방법 및 기능, XML로 구성된 디지털아이템 선언(Digital Item Declaration)에서 미디어 리소스를 참조하는 방법 등이다. 제안한 멀티미디어 파일 포맷은 디지털방송, 무선통신, 인터넷 환경에서의 다양한 형태의 컨텐츠들을 효과적이고 체계적으로 조합할 수 있는 기능 및 효과적인 전송 기능을 제공하며, 향후 xml 기반 메타데이터와 미디어리소스를 포함하는 멀티미디어 컨텐츠의 파일 포맷에 대한 참고 모델로서 사용될 수 있다.