• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.219-222
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• 2005

본 논문에서는 사용자 및 디바이스 기반의 도메인을 구현하고, 그 관리 방법에 대해서 논의하였다. 도메인 구성에 사용자와 디바이스를 동시에 포함시킨 것과 각 사용자가 사용할 수 있는 디바이스들을 정의할 수 있고, 반대로 디바이스를 사용할 수 있는 사용자를 한정 정의할 수 있다는 것이 특징이다. 본 논문에서 제안하는 사용자 및 디바이스 기반의 도메인을 적용하면, 사용자와 디바이스를 기반으로 서브 도메인을 구성하여 라이센스를 발급할 수 있기 때문에 폭 넓은 라이센스 정책을 수립할 수 있다.

• Journal of Digital Convergence
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• v.11 no.3
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• pp.299-304
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• 2013

Culture contents are connected directly with our lives. Experts who produce culture contents or work at such industry or most of people regardless of age and gender are exposed to media contents like movie, game, animation, broadcasting and advertising. There are a number of users who use smart phones and smart pads which can view such media contents. The era of smart device which people easily surf, watch, and produce media contents will be opened. Therefore, the efficient curriculum for producing more touchable media contents should be developed continuously. Most of people recognize the necessity of educations to enhance creativity at university education. This paper intended to research the method of roles curriculum of university produce culture contents which stimulate emotion, creative and show new technology. This paper suggests academic curriculum for department of culture and contents based on the basics, even though new media device emerges the proper talents can be fostered.

• Journal of Biomedical Engineering Research
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• v.36 no.4
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• pp.135-142
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• 2015

Outflow cannulation site of left ventricular assist device(LVAD) chosen by considering anatomical structure of thoracic cavity and vascular system. Though outflow cannulation site influences blood perfusion at each branch, there is no standard rule or quantitative data. In this study, we computed the amount of blood perfusion at each arterial branch numerically according to outflow cannulation sites(ascending aorta, aortic arch, descending aorta). We generated computational meshes to the three-dimensionally reconstructed arterial system. Clinically measured arterial pressure were used for inlet boundary condition, porous media were applied to mimic blood flow resistance. Blood perfusion through left common carotid artery was 2.5 times higher than other cases, and that through right common carotid artery was 1.1 times higher than other branches. Although this is simulation study, will be useful reference data for the clinical study of LVAD which considers blood perfusion efficiency.

• Journal of the Korean Society for Precision Engineering
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• v.28 no.4
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• pp.526-533
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• 2011

This research is about the pulsatile pump system utilized in the perfusion bioreactor for the in vitro human tissue culture. A pulsatile pump system which can be applied to the culture of the vascular tissues including blood vessel is developed by using the idea of human heart's blood pumping into organs as followings: culture chamber, a pressurizing device which generates laminar pulsatile flow by controlling the x-sectional area of the culture media delivering tubing, a compliance chamber which supplies the pressuring device with a constant pressure, and a peristaltic pump which circulates the culture media in a circuit ranging from the culture chamber to the compliance chamber. The developed pulsatile pump system shows that a physiology of the human heart's blood pumping including pulsatile pressure waveform of systolic-diastolic pressure is well represented. Not only time domain but also frequency domain characteristics of pulsatile pump system which are necessary for the vascular tissue culture such as pulsatile pressure waveform's shape, the frequency, and the magnitude can be easily generated and manipulated by using the proposed system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.5
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• pp.975-981
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• 2017

In this paper, we propose a method for efficient use of energy when using flash device in WSN environment. Typical Flash devices have a drawback to be an energy efficient storage media in the energy-constrained WSNs due to the high standby energy. An energy efficient approach to deploy Flash devices into WSNs is simply turning the Flash device off whenever idle. In this regard, we make the simple but ideal approach realistic by removing these two obstacles by exploiting nonvolatile RAM (NVRAM), which is an emerging memory technology that provides both non-volatility and byte-addressability. Specifically, we make use of NVRAM as an extension of metadata storage to remove the FTL metadata scanning process that mainly incurs the two obstacles. Through the implementation and evaluation in a real system environment, we verify that significant energy savings without sacrificing I/O performance are feasible in WSNs by turning off the Flash device exploiting NVRAM whenever it becomes idle. Experimental results show that the proposed method consumes only about 1.087% energy compared to the conventional storage device.

• Broadcasting and Media Magazine
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• v.14 no.2
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• pp.113-122
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• 2009

RoSE(representation of sensory effects)기술은 A/V미디어에서 제공하는 시청각 효과 이외에 바람/향기/진동 등의 실감효과를 팬/발향기/진동의자 등의 다양한 디바이스와 연동시킴으로써 미디어의 실감효과를 극대화하는 기술이다. 2007년 10월 82차 MPEG회의에 처음 제안된 RoSE프레임워크는 SE(sensory effects), USP(user sensory preferences), SDC(sensory device capabilities), SDCom(sensory device commands)의 표준아이템이 상호 연동하는 시스템 구조를 갖는다. 지난 2월 87차 MPEG로잔(Lausanne)미팅에서는 이들을 현실과 가상을 연결하는 인터페이스 표준을 정하는 MPEG-V(ISO/IEC 23005) 프로젝트의 Part 2(control information)와 Part 3(sensory information)으로 분리 배치하고 오는 7월 89차 런던 미팅에서 CD(committee drait)를 목표로 표준화를 진행하고 있다. 본 논문에서는 XML에 기반한 이들 4개의 표준 아이템 구성을 살펴보고 현재까지 MPEG 에서 진행되어 온 RoSE표준화 과정을 소개한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.954-956
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• 2013

IOS/IEEE 11073 PHD 표준들은 u-헬스 측정기기와 u-헬스 게이트웨이간의 통신을 가능하게 하도록 설계되어 있다. 모바일 단말기를 데이터 취합을 위한 중계기로 활용하고 별도의 게이트웨이를 구성하여 헬스케어 의료기기를 연동하고 모니터링을 위한 인터페이스를 제공해 왔으나 스마트폰 애플리케이션 단계에서 IEEE 11073 플랫폼을 포함하여 헬스케어 의료기기를 활용하는 u-헬스케어 서비스를 제공하기에는 많은 제약이 있다. 이에 본 논문에서는 Android 4.0.x OS 스마트폰을 대상으로 Bluetooth HDP을 활용하여 u-헬스케어 시스템에서의 게이트웨이/서버 플랫폼 기능을 포함하는 헬스케어 의료기기의 모니터링 애플리케이션 시스템을 설계하였다.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.6
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• pp.839-849
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• 2017

Recently, the role of the kitchen has evolved from the space for previous survival to the space that shows the present life and culture. Along with these changes, the use of IoT technology is spreading. As a result, the development and diffusion of new smart devices in the kitchen is being achieved. The user experience for using these smart devices is also becoming important. For a natural interaction between a user and a computer, better interactions can be expected based on context awareness. This paper examines the Natural User Interface (NUI) that does not touch the device based on the user interface (UI) of the smart device used in the kitchen. In this method, we use the image processing technology to recognize the user's hand gesture using the camera attached to the device and apply the recognized hand shape to the interface. The gestures used in this study are proposed to gesture according to the user's context and situation, and 5 kinds of gestures are classified and used in the interface.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.39 no.4
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• pp.429-441
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• 2002

This paper concerns extracting 3D motion information from a 3D input device in real time focused to enabling effective human-computer interaction. In particular, we develop a novel algorithm for extracting 6 degrees-of-freedom motion information from a 3D input device by employing an epipolar geometry of stereo camera, color, motion, and structure information, free from requiring the aid of camera calibration object. To extract 3D motion, we first determine the epipolar geometry of stereo camera by computing the perspective projection matrix and perspective distortion matrix. We then incorporate the proposed Motion Adaptive Weighted Unmatched Pixel Count algorithm performing color transformation, unmatched pixel counting, discrete Kalman filtering, and principal component analysis. The extracted 3D motion information can be applied to controlling virtual objects or aiding the navigation device that controls the viewpoint of a user in virtual reality setting. Since the stereo vision-based 3D input device is wireless, it provides users with a means for more natural and efficient interface, thus effectively realizing a feeling of immersion.

• Journal of Korea Society of Digital Industry and Information Management
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• v.4 no.1
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• pp.41-46
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• 2008

With widespread use of the Internet and improvements in streaming media and compression technology, digital music, video, and image can be distributed instantaneously across the Internet to end-users. However, most conventional Digital Right Management are often not secure and fast enough to process the vast amount of data generated by the multimedia applications to meet the real-time constraints. In this paper, we propose the copyright protection using encryption of DCT coefficients and motion vector in MPEG-4 video codec of mobile device. This paper presents a new Digital Rights Management that modifies the Motion Vector of Macroblock for mobile device. Experimental results indicate that the proposed DRM can not only achieve very low cost of the encryption but also enable separable authentication to individual mobile devices such as Portable Multimedia Player and Personal Digital Assistants. The performance of the proposed methods have low complexity and low increase of bit rate in overhead.