• 정보화사회
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• s.21
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• pp.20-30
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• 1989

일본최대의 기업 NTT는 민영화 5년째를 맞이하면서 심각한 위기에 직면하고 있다. 지난해말 리쿠르트 파문으로 신토 전회장의 사임으로 시작된 NTT의 위기는 분할론에 휩싸이면서 주가폭락등으로 이어져 상황은 더욱 악화일로에 있다. 우정성이 미 ATT분할이 성공적이었다는 평가를 내리고 NTT분할에 긍정적 입장을 취하고 있는데다 여론과 국민까지 분할을 지지하고 있는 상황이어서 앞으로 NTT의 향방은 일본내 뿐만 아니라 세계적 관심으로 부상하고 있다. "NTT는 과연 어떻게 될 것인가?" NTT 분할에 대한 일본 각계의 시각을 종합해 본다.

• Electronics and Telecommunications Trends
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• v.8 no.3
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• pp.163-183
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• 1993

NTT는 1980년에 DDX-P 패킷통신서비스를 개시하여 현재 DDX-TP, DDX-TP 및 INS-P의 3종류의 서비스를 제공하고 있다. 본 고는 NTT의 패킷통신망 구조, 기능 및 싱호통신 등 NTT 패킷통신서비스 전반적인 면과 이를 이용한 사례를 분석한 결과이다.

• 정보화사회
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• s.117
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• pp.70-71
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• 1997

NTT는 지난 96년 12월 우정성과 회사의 구조 개편 기본 원칙에 합의 하였음을 발표하였다. NTT가 100% 자본 참여를 하게 되는 순수지주회사로의 재편 계획은 우정성에 의하여 제의되었다. 합의 내용 중에는 NTT가 완전한 국제 사업자로서 탈바꿈하여 국제 서비스 사업 참여를 허용하도록 입법조치한다는 것이 포함되어 있다. 발표 이후, NTT는 그 계획과 맥락을 같이하는 조직 개편을 위한 경영관리에 심혈을 기울이고 있다.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2004.11a
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• pp.82-83
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• 2004

• Journal of Broadcast Engineering
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• v.9 no.2
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• pp.119-130
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• 2004

We have developed a prototype super-high-definition (SHD) digital cinema distribution system that can store, transmit, and display eight-million-pixel motion pictures that have the image quality of a 35-mm film movie. The system contains a movie server, a real-time decoder, and an SHB projector. Using a Gigabit Ethernet link and TCP/IP, the server transmits JPEG2000 compressed motion picture data streams to the decoder at transmission speeds as high as 300 Mbps. The received data streams are decompressed by the decoder, and then projected onto a screen via the projector. By using an enlarged TCP window, multiple TCP streams, and a shaping function to control the data transmission quantity, we achieved real-time streaming of SHD movie data at about 300 Mbps between Chicago and Los Angeles, a distance of more than 3000 km. We also improved the decoder performance to show movies with Image qualities of 450 Mbps or higher. Since UDP is more suitable than TCP for fast long-distance streaming, we have developed an SHD digital cinema UDP relay system, in which UDP is used for transmission over a fast long-distance network. By using four pairs of server-side-proxy and decoder-side-proxy, 450-Mbps movie data streams could be transmitted.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.267-272
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• 2009

Video digests provide an effective way of confirming a video content rapidly due to their very compact form. By watching a digest, users can easily check whether a specific content is worth seeing in full. The impression created by the digest greatly influences the user's choice in selecting video contents. We propose a novel method of automatic digest creation that evokes a joyful impression through the created digest by exploiting smile/laughter facial expressions as emotional cues of joy from video. We assume that a digest presenting smiling/laughing faces appeals to the user since he/she is assured that the smile/laughter expression is caused by joyful events inside the video. For detecting smile/laughter faces we have developed a neural network based method for classifying facial expressions. Video segmentation is performed by automatic shot detection. For creating joyful digests, appropriate shots are automatically selected by shot ranking based on the smile/laughter detection result. We report the results of user trials conducted for assessing the visual impression with automatically created 'joyful' digests produced by our system. The results show that users tend to prefer emotional digests containing laughter faces. This result suggests that the attractiveness of automatically created video digests can be improved by extracting emotional cues of the contents through automatic facial expression analysis as proposed in this paper.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.830-833
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• 2009

Deblocking Filter (DF) is newly introduced into H.264/AVC to remove blocky artifacts. It improves the picture quality and the improved picture is set to the frame buffer for motion compensation. As a result, higher coding efficiency is achieved by DF. However, if the original image has heavily-slanted patterns, DF removes the edges to be kept because it is applied only perpendicularly to the block boundaries. In this paper, we propose Edge Adaptive Deblocking Filter (EADF) which is applied not only for the perpendicular but also for several slanted directions to deal with the problem. Simulation results showed us that EADF was especially effective for the sequence "Foreman" with PSNR gain of 0.04 dB.

• Journal of Communications and Networks
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• v.15 no.6
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• pp.569-575
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• 2013

In this paper, we present a photonic approach for generating highly stable coherent sub-terahertz (THz) signals for wireless communications. As proof-of-concept we transmit data at 100 GHz carrier frequency using on-off keying modulation and heterodyne detection. The sub-THz carrier signals are generated by photo-mixing two optical carrier signals at different frequencies, extracted from an optical frequency comb. We introduce a novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bit rate of 8.5 Gbit/s at 100 GHz.

• The Magazine of the IEIE
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• v.22 no.2
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• pp.37-50
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• 1995

This paper reviews NTT Laboratories' research and development of x-ray lithography during the last ten years since the application of synchrotron orbital radiation(SOR). First, the historical background of x-ray lithograhpy research, NTT's research programs on synchrotron x-ray lithography(SOR lithography), and the current status of NTT's SOR lithography system are overviewed. Then, the key elements of SOR lithography system are reviewed, including the electron storage ring, the x-ray stepper, and the x-ray mask. Finally the appilcation of SOR lithography technology to device fabrication is reported.

• Electrical & Electronic Materials
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• v.11 no.11
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• pp.53-65
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• 1998

Planar lightwave circuits (PLCs) provide various important devices for optical wavelength division multiplexing (WDM) systems, subscriber networks and etc. This paper reviews the recent progress and future prospects of PLC technologies including arrayed-waveguide grating multiplexers, optical add/drop multiplexers, programmable dispersion equalizers and hybrid optoelectronics integration technologies.