• International Journal of Advanced Culture Technology
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• v.4 no.4
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• pp.64-69
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• 2016

Currently on the school education site, various multimedia contents are used to effectively deliver knowledge to the students and increase interest in class. The majority of the multimedia contents currently used in classes are composed of visual and auditory information. This paper intends to maximize actuality and immersion in the content by adding olfactory information to the existing visual and auditory data. Tangible contents were developed based on the details of aromatic plants learned in the fifth grade of elementary school. The shape and explanation of the aromatic plants are displayed with visual and auditory information, and an aroma spraying application is used to allow the students to smell the aromatic plants. After conducting the class using the developed contents, the students' satisfaction of the class, as well as their overall academic understanding, were investigated. Upon doing so, it was discovered that the students' academic understanding and satisfaction increased in comparison to classes comprised of only visual and auditory contents.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.6B
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• pp.593-600
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• 2002

The reverse link signal power required for multimedia traffic in multipath faded single-code (SC-) and multi-code CDMA (MC-CDMA) systems is investigated. The effect of orthogonality loss among multiple spreading code channels is herein characterized by the orthogonality factor. The required signal power in both the CDMA systems is then analyzed in terms of the relative required signal power ratio of data to voice traffic. The effect of varying system parameters including spreading bandwidth, the of orthogonality factor, and the number of spreading codes are examined. Analytical results show that MC-CDMA users transmitting only a single traffic type require significantly more power than SC-CDMA users with only a single traffic type. On the other hand, MC-CDMA users transmitting multimedia traffic require power levels approximately identical to SC-CDMA users with multimedia traffic. The results can be used in the design of radio resource management (e.g., power allocation) scheme for wireless multimedia services.

• The Journal of Natural Sciences
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• v.8 no.1
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• pp.123-129
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• 1995

This paper describes the design and implementation of multimedia presentation system based on the compensative synchronization algorithm. We proposed the compensative synchronization algorithm in compensation for previously preestimated delay-time in order to minimize delay-time in multimedia presentation system. The presentation system uses compensative synchronization algorithm and have multimedia objects as text, raster graphics, geometric graphics, or audio.

• Annual Conference of KIPS
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• 2017.11a
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• pp.913-914
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• 2017

최근 가상현실 기기가 발전함에 따라 가상현실 콘텐츠 시장이 활발하게 성장하고 있다. 그래서 가상현실 콘텐츠 개발이 활발히 이루어지고 있다. 가상현실에서 사용가능한 기기가 발전하여 가상현실 콘텐츠에서 추가적인 기기를 사용가능하도록 가상현실 콘텐츠 수정해야 되는 문제점이 있다. 가상현실 콘텐츠 수정 없이 추가적인 기기를 사용가능한 제스처 입력 방법이 필요하다. 제안한 방법은 기기에 관계없이 가상현실 콘텐츠에서 사용하기 위한 제스처 입력 시스템 설계 방법을 제안한다. HTC VIVE으로 제스처 입력 시스템을 러닝 게임에 적용하여 검증하였다.

• Annual Conference of KIPS
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• 2016.04a
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• pp.834-835
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• 2016

가상공간 내에서 다중사용자 간에 NUI를 기반으로 상호작용하기 위한 기반 기술로 사용자 식별 연구가 활발이 수행되고 있다. 이 때 단일 센서만을 이용할 경우 센싱 범위의 한계와 가림 및 겹침으로 인해 사용자의 정확한 특징데이터를 인식하기 어렵다. 이러한 문제점을 해결하기 위하여 멀티 센서를 이용한 사용자 식별 시스템을 제안한다. 제안한 시스템을 설계 및 구현한 결과, 다중 사용자 개개인에 대한 식별이 가능함을 확인하였다.

• Convergence Security Journal
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• v.8 no.4
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• pp.91-96
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• 2008

An increasing in quantity of multimedia data brought a new problem that expected data should be retrieved fast and exactly. The adequate representation is a key element for the efficient retrieval. For this reason, MPEG-7 standard was established for description of multimedia data in 2001. In this paper, we designed a Audio/Image Retrieval System based on MPEG-7 that can retrieve multimedia data like audio, image efficiently. And we integrated high-level and low-level schemas to retrieve datas for users.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.347-348
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• 2012

눈 앞에 보이는 생활 속 불편 사항을 민원으로 처리할 수 있는 모바일 애플리케이션에 대한 필요성이 꾸준히 제기되어 왔다. 트위터나 페이스북과 같은 기존 소셜 네트워크 서비스 또한 수많은 글들이 올라오기 때문에 민원 내용에는 초점이 맞춰져 있지 않다. 본 논문에서는 안드로이드 기반의 민원 신고와 소셜 네트워크 서비스를 통합한 애플리케이션을 제안한다. 사용자는 민원에 집중된 내용을 다른 사람들과 실시간으로 공유하면서 정부 기관에서도 즉각적인 민원 확인이 가능하다. 이를 통해 시민들과 관공서 간의 빠른 민원 파악 및 처리의 효율성을 향상시킨다.

• Convergence Security Journal
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• v.2 no.1
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• pp.49-57
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• 2002

Real-Time Protocol (RTP) is used for multimedia information transmission and RTP payload must be encrypted for providing multimedia information security. Encryption/decryption delay is minimized, because there are constraints in transporting a multimedia data through the Internet. Therefore, encryption algorithm is changed with considering network traffic and load. During many users participate in the same multimedia service, an user who already left the service can receive and decrypt the RTP payload because of knowing the encryption key. In this paper, Security Control Protocol for RTP is designed and implemented for changing the encryption algorithm and the key.

• The Transactions of the Korea Information Processing Society
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• v.6 no.3
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• pp.562-570
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• 1999

Information superhighway and improvement of computing power result in increase of the requirements for distributed multimedia applications. But, developer of applications needs much time and efforts because of the difficulties of development, enhancement and maintenance of distributed applications. To solve this problem, CORBA is used widely. But, the definitions of CORBA services are required for the brief developments of distributed multimedia applications. Especially, collaboration service is required because multiple users use distributed multimedia service. Collaboration service manages user and group information of applications and makes the interoperability between of multi users. In this paper, we designed collaboration service for CORBA based distributed multimedia applications. Collaboration service is able to maintain group information and to present the ability for collaborative works between of multi users. Application developers can develop the applications easily because the ability of collaborative works is offered by collaboration service.

• The Transactions of the Korea Information Processing Society
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• v.3 no.3
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• pp.608-616
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• 1996

In this paper, we propose a multimedia hardware architecture for desktop video-conferencing in view of the multimedia data flow and analyze system operation using queueing model. We analyze the bottleneck of multimedia data flow for video- conferencing by simulation, varying the video size, frame rate, the number of participants, and video data compression rate, And we also implement and test the archiecture, that almost includes the analyzed requirements for video-conferencing, to confirm the simulation results. This paper describes the considerations in designing a multimedia I/O system.