• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.883-885
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• 2014

본 연구에서는 EPUB3.0을 지원하는 안드로이드 EPUB3.0 뷰어 설계 및 구현에 관한 것이다. 안드로이드 EPUB3.0뷰어는 EPUB File Controller, EPUB File Analyzer, EPUB Viewer모듈로 구성되어지며, 각 모듈은 서로 연계하여 효율적으로 뷰어가 구동할 수 있도록 설계되어졌다. 설계되어진 모듈은 HTML5, CSS3, MathML, 벡터 그래픽, 멀티미디어를 활용하여 기기 호환을 자유롭게 이루어 질수 있도록 구현 되어졌으며 EPUB3.0 표준에 맞추어져 있어, 동영상, 오디오, 표현이 자유롭다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.154-155
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• 2022

본 논문에서는 RGB-D 카메라 캘리브레이션의 결과를 개선하는 새로운 기법을 제안한다. 멀티 뷰 카메라 캘리브레이션은 카메라를 통해 획득한 이미지에서 특징점을 찾아 다른 카메라에서 촬영된 동일한 특징점을 기준으로 캘리브레이션을 진행하는 것이 일반적이다. 그러나 카메라를 통해 획득된 RGB-D 영상은 필연적으로 렌즈와 Depth senor에 의한 오차가 포함되기 때문에 정확한 캘리브레이션 결과를 획득하는 것은 어려운 과정이다. 본 논문에서는 이를 개선하기 위해 획득한 특징점을 기반으로 캘리브레이션을 진행한 후, 최소제곱법을 통해 각 특징점간의 거리가 최소가 되는 카메라 파라미터를 획득하여 결과를 개선하는 기법을 제안한다.

• Journal of Korea Multimedia Society
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• v.13 no.7
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• pp.933-942
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• 2010

The convergence of the telecommunication industry through the combination of existing network technology and multimedia technology has brought along interactive data services in addition to the traditional broadcast services by providing direct connections between the users and the broadcasters. The interactive data service technology has developed a network which is able to fully support QoS and also a fast enough channel changing technology that is satisfactory to the user, are prerequisites for IPTV success, to provide satisfactory levels of service to exist users. However the current server-client system can't support all increasing needs of users. To overcome these limitations, P2P based IPTV service is currently under researched. Therefore, this thesis proposes a logical view based copy-ahead technique for P2P IPTV to improve the performance of IPTV system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1341-1349
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• 2011

This research is focused on an analysis on the structure of RAW image file and the development of a RAW image file viewer for an embedded device. Recently, several RAW image file formats are being used for saving and displaying the images created by various DSLR cameras, and the necessity of handing RAW images in mobile multimedia devices is increasing. For the development of RAW image decoding/encoding library applicable to WinCE-based embedded devices viewer, an analysis of RAW image file formats, such as CRW, CR2, PEF, NEF, MRW, have been performed because their formats are not released in public. By using the library, the analysis software which can extract RAW image data, 2~3 JPEG image files and other informations such as the specification of a camera and various photographic parameters from RAW image files, were developped and a RAW image file viewer which can run in WinCE-based embedded devices. The experimental result has shown that the viewer could encode and decode RAW image files successfully and it took approximately 10secs to load them to the screen in S3C6410 based embedded platform. The outcomes of this research cloud be a good information and solution to multimedia application developers.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.2
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• pp.130-138
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• 2014

In this paper, the SMV 3D display method using liquid crystal shutter glass(LCSG) and SPB has been proposed. The proposed SMV display can solve the resolution degradation problem of conventional multiview displays that using based time-multiplexing method. Also, observers fatigue due to the mismatch between accommodation and vergence problem of glass-type 3D displays and conventional multiview displays, can be improved using SMV 3D display method.

• Journal of Korea Multimedia Society
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• v.8 no.10
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• pp.1293-1305
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• 2005

In this paper, we propose the method of manipulating the gaze direction of 3D FPS game's character by using eye gaze detection from the successive images captured by USB camera, which is attached beneath HMD. The proposed method is composed of 3 parts. In the first fart, we detect user's pupil center by real-time image processing algorithm from the successive input images. In the second part of calibration, the geometric relationship is determined between the monitor gazing position and the detected eye position gazing at the monitor position. In the last fart, the final gaze position on the HMB monitor is tracked and the 3D view in game is control]ed by the gaze position based on the calibration information. Experimental results show that our method can be used for the handicapped game player who cannot use his (or her) hand. Also, it can increase the interest and immersion by synchronizing the gaze direction of game player and that of game character.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.7
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• pp.1387-1394
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• 2015

Along with the development of network transmission technology, the IPTV market is growing in fast pace. Additionally the UHD resolution broadcasting system along with user experience (UX) that provides better service to user has attracted attention recently since there are not enough research has been done with differentiated the UX that can enhance the UX yet. Therefore we proposed a low complexity syntax level image stitching implementation technique that run with multi-view services, which makes possibility to view multiple channel or video contents on the screen at the same time. Simulation results have demonstrated the liability and effectiveness of the proposed algorithm by showing that capability of generating more than 80 frames per second by stitching four Full-HD size videos into UHD frame.

• Journal of the Korea Society of Computer and Information
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• v.14 no.9
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• pp.1-10
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• 2009

The field of the web service orchestration introduced to generate a valuable service by reusing single services. Recently, it suggests rule-based searching and composition by the AI (Artificial Intelligence) instead of simple searching or orchestration based on the IOPE(Input, Output, Precondition, Effect) to implement the Semantic web as the web service of the next generation. It introduce a AOP programming paradigm from existing object-oriented programming paradigm for more efficient modularization of software. In this paper, we design a dynamic web service orchestration and invocation scheme applying Aspect-Oriented Programming (AOP) and Reflection for Semantic web. The proposed scheme makes use of the Reflection technique to gather dynamically meta data and generates byte code by AOP to compose dynamically web services. As well as, our scheme shows how to execute composed web services through dynamic proxy objects generated by the Reflection. For performance evaluation of the proposed scheme, we experiment on search performance of composed web services with respect to business logic layer and user view layer.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.149-153
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• 2006

외부 조인은 조인에 참여하는 릴레이션들에서 조인 조건을 만족하지 않는 한쪽 또는 양쪽 튜플들도 결과로 반환하는 조인 연산으로 OLAP 질의 처리, 계층적 뷰 처리, 중첩 질의 처리 등의 다양한 고급 데이타베이스 응용에서 널리 사용된다. 많은 상용 DBMS에서 외부 조인을 지원하고 있으나, 상세한 구현 방법은 공개되어 있지 않다. 본 논문에서는 한국과학기술원 멀티미디어 및 데이타베이스 연구실에서 개발하고 있는 오디세우스 객체관계형 DBMS를 위한 외부 조인을 설계하고 구현한다. 본 논문에서는 거의 모든 DBMS에서 제공 되는 가장 기본적인 조인 방법인 중첩 루프 조인 알고리즘을 확장하여 외부 조인 연산을 구현한다. 그리고, 외부 조인이 포함된 질의를 최적화하기 위해 조인 연산의 결과를 임시 릴레이션에 저장하는 대신에 다음 조인 연산의 입력으로 파이프라이닝시키는 것을 최대화 하는 방법을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.445-450
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• 2011

In this paper, we describe the implementation of an wireless sensor network testbed. We developed a web-based sensor network gateway and enhanced the Surge program which is used for sending and routing of packets in the sensor field. The developed program can transmit the source data of sensor nodes to the sink node via multi-hop routing, and deliver user commands to actuate sensor related equipments. Moreover, in this testbed, the data transport path from a node to the sink can be monitored. Thus we can approximate the network topology and the relative positions of sensor nodes. We also describe an application of the testbed that is used for controlling a remote robot.