• ETRI Journal
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• v.28 no.2
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• pp.239-242
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• 2006

In this letter, we propose a new functionality to scalable video coding (SVC), that is, the support of multiple region of interests (ROIs) for heterogeneous display resolution. The main objective of SVC is to provide temporal, spatial, and quality scalability of an encoded bitstream. The ROI is an area that is semantically important to a particular user, especially users with heterogeneous display resolutions. Less transmission bandwidth is needed compared to when the entire region is transmitted/decoded and then sub-sampled or cropped. To support multiple ROIs in SVC, we adopt flexible macroblock ordering (FMO), a tool defined in H.264, and based on it, we propose a way to encode and, independently, decode ROIs. The proposed method is implemented on the joint scalable video model (JSVM) and its functionality verified.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.499-505
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• 2006

거울은 인간이 자신의 모습을 들여다 보기 위해 오랜 세월 동안 이용했던 친숙한 도구이다. 디지털 기술의 발달로 우리는 빛과 정보를 함께 반사해 주는 거울에 대한 여러가지 접근들을 보아 왔다. 전통적인 거울은 빛의 즉각적인 반사에 의해 일어나는 자동적인 시각적 피드백 덕분에 특별한 조작이 필요하지 않으나, 빛과 정보가 함께 반사되는 디지털 거울에서는 다른 형태의, 좀더 적극적인 사용자 인터랙션을 기대할 수 있다. 본 논문에서는 사용자와 거울간의 거리에 따른 행태 조사를 중심으로 인터랙션 유형의 사례 분류 및 사용자 조사 연구를 정리하였다. 이를 바탕으로 거리에 따라 다른 사용자 요구사항을 충족하는 디지털 거울에 적합한 조작 인터페이스를 제안하고, 초기 모델로 회전식 적외선 격자를 이용한 조작, 비젼 기반의 정면 이미지 획득 및 얼굴 확인, 그리고 적외선 위치확인을 통해 사용자와 인터랙션하는 거울을 설계하였다. 본 연구에서는 거울과의 인터랙션에서 나타나는 사용자의 요구사항을 토대로 여러 비접촉식 거울 인터페이스를 설계하고 시스템에 적용한 사례를 분석한다. 아울러 결과물의 초기모델에 대한 분석을 통해 더 개선된 형태의 '거울을 응용한 시스템'의 설계 가능성을 보일 수 있다.

• IEIE Transactions on Smart Processing and Computing
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• v.2 no.1
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• pp.11-19
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• 2013

A video-zoom driven audio-zoom algorithm is proposed to provide audio zooming effects according to the degree of video-zoom. The proposed algorithm is designed based on a super-directive beamformer operating with a 4-channel microphone array in conjunction with a soft masking process that uses the phase differences between microphones. The audio-zoom processed signal is obtained by multiplying the audio gain derived from the video-zoom level by the masked signal. The proposed algorithm is then implemented on a portable digital imaging device with a clock speed of 600 MHz after different levels of optimization, such as algorithmic level, C-code and memory optimization. As a result, the processing time of the proposed audio-zoom algorithm occupies 14.6% or less of the clock speed of the device. The performance evaluation conducted in a semi-anechoic chamber shows that the signals from the front direction can be amplified by approximately 10 dB compared to the other directions.

• Journal of Satellite, Information and Communications
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• v.3 no.2
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• pp.43-47
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• 2008

COMS is the one of Korean hybrid geostationary satellite and is scheduled to be launched in 2009 by Arian V into $128^{\circ}$ E longitude. COMS is designed and manufactured for three main objectives which are Communications, Oceanographic, and Meteorological missions. It provides the weather monitoring, ocean monitoring, and Ka band satellite communication services by means of three different payloads. The Ka band communications payload was developed by Electronics and Telecommunications Research Institute (ETRI), and provides not only the digital transmission for the communication services against natural disaster but also digital transmission for the high speed multimedia services. This paper describes the overview of the electrical and mechanical design and measured performances of the Ka band communications transponder flight model (FM) for COMS.

• Journal of Satellite, Information and Communications
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• v.12 no.1
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• pp.18-21
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• 2017

In this paper we present IoT compliant HD Digital Signage Controller design using Raspberry Pi. Nowadays, the digital signage system have gained increasing popularity and rapidly growing communications medium that offers a wide range of exciting ways with customers, enhance brand awareness, increase sales and margin uplift by replacing the traditional static signage system. This paper presents a cost-effective IoT based HD Digital Signage Controller (DSC) using R-Pi computer that can use various kinds of displays in order to make the system as efficient and affordable as possible to provide advertisement or other relevant information to people in public areas. The system is designed in such way the information about surrounding related place is taken through sensors and directly uploaded to the internet, and thus can be accessed anytime and displayed on screens by using Raspberry Pi that serves as controller in the system. The design and implementation of the system developed by using python programming language and its hardware consists of sensors, Arduino, Raspberry Pi 3 model B board and the displays. The main targets of this study are build a cost effective Digital Signage system as well as broadcasting information at display contents in public areas and control those digital signs.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.55-58
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• 1999

For the asymmetric digital subscriber line communications, the paper proposes a new echo canceller with the so-called CALAOI(CAscade of LAttice and Orthogonalized IIR) structure, which comprises of a lattice and an orthogonalized IIR structure. Through simulations, the CALAOI echo canceller was verified to have much fewer complexity of computations and has faster convergence speed than conventional FIR echo canceller. The CALAOI echo canceller is predicted to maximize performances of communication services in high speed communications such as VDSL, GIGA bit Ethernet, and so on as well as ADSL.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.41-45
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• 2005

A new algorithm of the image mapping which is a technique of the elemental image generation is proposed. The proposed method is based on the characteristics of the lens array such as the number, the size and the focal length of the elemental lens. The 3D image generated by 3D graphic API such as OpenGL can be directly adopted without the complex adaptation. Since the image mapping using the proposed method can enhance the speed of the elemental image generation, the computer- generated integral imaging system can be applied to virtual reality system.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.198-202
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• 1988

In digital mobile communications received speech data are affected by burst errors as well as random errors. To overcome these errors we propose a bit-selective forward error correction scheme for the speech data which is sub-band coded at 13 kbps and transmitted over a 16 kbps channel. For a few error correcting codes the signal-to-noise ratio of error-corrected speech is obtained and compared through the simulation of mobile communication channels.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.193-194
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• 2007

In this paper we present work done by Kodak Graphic-Communications-Group and our partners demonstrating applications where laser direct imaging could replace photolithography in display manufacturing. Such applications range from direct manufacturing (e.g. LCD color-filters) to producing “masters” where manufacturing is done by traditional printing methods (e.g. flexography, Gravure-printing).

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.806-808
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• 2014

현재까지의 음성 출력 시스템은 텍스트를 있는 그대로 읽어 주는 것에 불과했다. 단위, 약어의 경우 알파벳을 그대로 읽어 주게 되어 그 본래의 의미를 제대로 파악하기 어려웠다. 본 연구에서는 단위나 약어의 본래의 의미를 찾아서 풀어서 음성 변환해 주는 방법을 제안함으로써 시각 장애인에게도 텍스트의 정확한 정보를 전달할 수 있다는 장점이 있다.