• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.938-941
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• 2011

A docking station design using portable media player for receiving and storing in digital broadcasting is presented in this paper. The receiving and storing for digital broadcasting contents is equipped with setup box. That enables to be removable and portable with multimedia player, and the portable media player is driving by Android operating system. The results of the implementation, this system enables to receive digital broadcasting, DMB, satellite broadcasting and territory broadcasting, and to store video image in real time.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.700-705
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• 2007

프로젝션 기반의 증강현실(AR, augmented reality) 시스템이란, 고화질의 가상 정보를 프로젝터를 통하여 정해진 공간에 정확하게 표시해 주는 시스템을 말한다. 대부분의 증강현실 시스템은 사용자의 몰입감을 높이기 위해 고화질, 대 화면을 제공하기 위한 디스플레이 장치를 사용하며, 영상처리의 복잡도에 따른 고성능의 프로세스 장치를 요구하기 때문에 데스크탑 환경에서 이루어졌다. 그러나, 데스크탑 환경에서의 증강현실 시스템은 휴대가 불편하다는 단점을 가진다. 최근 프로젝터의 소형화와 모바일 프로세서의 성능 향상은 휴대가 편리한 모바일 증강현실 시스템의 등장을 가능하게 하였다. 그러나, 모바일 증강현실 시스템은 작은 디스플레이를 이용하여 영상 정보를 표시해 주기 때문에 높은 해상도를 지원할 수 없으며, 사용자의 몰입감을 감소시킨다는 단점을 가지고 있다. 본 논문에서는 기존의 증강현실 시스템의 단점을 보완하기 위하여 PDA와 소형 프로젝터를 결합하여 프로젝션 기반의 휴대용 멀티미디어 플레이어($PMP^2$ : Portable Multimedia Player using Projection-Based augmented reality)라는 모바일 증강현실 시스템을 제안한다. $PMP^2$는 모바일 프로세서의 대표격이라 할 수 있는 PDA와 휴대용 소형 프로젝터를 이용함으로써 고화질, 대화면의 증강현실 영상을 다수의 사용자가 원하는 장소와 시간에 즐길 수 있도록 해 준다. $PMP^2$는 스크린의 기하 및 컬러에 따른 왜곡을 보상해 줌으로써, 특정한 스크린 없이도 언제 어디서나 사용자에게 정확한 영상을 제공해 준다. 본 논문에서는 다양한 시나리오에 대해 $PMP^2$의 유용성을 검증함으로써 모바일 환경에서의 프로젝션 기반의 증강 현실 시스템의 활용 가능성을 제시한다.

• Journal of Korea Society of Industrial Information Systems
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• v.12 no.3
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• pp.95-103
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• 2007

Portable multimedia Player (PMP) devices have been gaining in its popularity with the emerging digital convergence of data, video, audio, etc. Since the PMP devices are typically equipped with DSP, a bigger LCD screen, and a hard disk, efficient power management has become more crucial than the other portable devices. This paper builds up a hardware/software-based power measurement system based on data acquisition devices. Subsequently, it measures and analyzes the power consumed in commercial PMP devices under different types of events: the system boot & shutdown, video playback, and the use of different video-coding types. Finally, our analysis of the measured power consumption patterns reveals useful information for the design of low-power PMP devices.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2005.11a
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• pp.31-34
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• 2005

Mobile devices, such as PDAs, portable multimedia players, are more likely to encompass large storage devices with prevalance of high-quality multimedia contents. This paper proposes an object-based multimedia contents storage architecture that employs the object-based storage device model and the iSCSI protocol. It also provides a multimedia content player that operates directly with the proposed storage architecture. We implement both the proposed storage architecture and the multimedia content player upon the Linux environment. Performance evaluation by playing MP3 multimedia contents reveals that the proposed storage architecture reduces the total power consumption by 9%, compared with an existing networked storage. This enhancement is mainly contributed to the fact that a large portion of the file system is moved into the object-based multimedia contents storage from the mobile device.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.253-253
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• 2004

• Journal of Korea Multimedia Society
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• v.9 no.8
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• pp.963-970
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• 2006

In this paper, we proposed a motion picture processor for using low-cost color super twisted nematic liquid crystal display(CSTN-LCD). The proposed processor apply a new driving scheme using SFP(Subgroup Frame Pattern), so we extends gray scale and eliminates flicker phenomenon. In addition, we apply the BFI (Black Field Insertion) to the design compensated for response time of a LC (Liquid Crystal). We use an edge enhancement and interpolation method to improve image quality of motion picture. The hardware architecture of proposed processor has been implemented and verified on a prototype FPGA board. The proposed method can be used in the display devices such as PDA(Personal Digital Assistants), mobile phone, and PMP(Portable Multimedia Player).

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.05a
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• pp.36-37
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• 2005

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.11
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• pp.517-526
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• 2008

As the functionality of portable devices arc being enhanced and the performance is being greatly improved, power dissipations of battery driven portable devices are being increased. So, an efficient power management for reducing their power consumption is needed. In this paper, we propose a window-based DVS algorithm for MPEG Player. The proposed algorithm maintains the recently frame information and execution time received from MPEG player in window queue and dynamically adjusts (frequency, voltage) level based on window queue information. Our algorithm can be implemented in the common multimedia player as a module. We employed well-known MPlayer for the measurement of performance. The experimental result shows that the proposed algorithm reduces energy consumption by 56% on maximal performance.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.46 no.2
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• pp.52-57
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• 2009

Recently, the regular service of a terrestrial digital multimedia broadcasting(T-DMB) made faster distribution of T-DMB receiver. The problem of an illegal distribution is increasing owing to a large distribution of T-DMB receiver. In this paper, we propose a watermarking and encryption method on T-DMB bit-stream for a copy and Play control to prevent an illegal distribution of T-DMB contents. We implement our proposed method on a portable multimedia player (PMP) which has T-DMB receiver. The proposed method insert the encrypted information for control of copy and play after finding padding area of program map table (PMT) and program association table (PAT) from analysis of transport stream (TS) of T-DMB. In implementation result, we can control use of contents according to information of copy and play control. The proposed method can be used to content Protection software for blocking of an illegal distribution of T-DMB contents on a mobile T-DMB receivers.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2007.11a
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• pp.123-123
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• 2007