• Title, Summary, Keyword: Information and Telecommunication Technologies

검색결과 190건 처리시간 0.037초

Performance Analysis and Comparison of Different Data Rates in Wideband CDMA Using Three Different Transmission Schemes

  • Pahadee, Sangita;Ahmed, Kazi M.;Rajatheva, R.M.A.P.;Sigdel, S.
    • 대한전자공학회:학술대회논문집
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    • pp.552-555
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    • 2002
  • Wideband CDMA is one of the radio access technologies for the third generation in which voice is the basic service. There has been lot of research work in order to find out the suitable transmission scheme to meet the requirement of accommodating variable type of services in Wideband-CDMA. This paper studies the behavior of different services using different transmission schemes in Wideband CDU and compares their performance in terms of BER. Different transmission schemes are found to be suitable for different services. Transmission schemes used are- fixed processing gain scheme also called as variable bandwidth scheme, single code transmission and multicode transmission. It is found that fixed processing gain scheme is suitable fur high data rates. Single code transmission is suitable fer low data rates where as multicode transmission is suitable for low and medium data rates.

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Fast Quadtree Structure Decision for HEVC Intra Coding Using Histogram Statistics

  • Li, Yuchen;Liu, Yitong;Yang, Hongwen;Yang, Dacheng
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.5
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    • pp.1825-1839
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    • 2015
  • The final draft of the latest video coding standard, High Efficiency Video Coding (HEVC), was approved in January 2013. The coding efficiency of HEVC surpasses its predecessor, H.264/MPEG-4 Advanced Video Coding (AVC), by using only half of the bitrate to encode the same sequence with similar quality. However, the complexity of HEVC is sharply increased compared to H.264/AVC. In this paper, a method is proposed to decrease the complexity of intra coding in HEVC. Early pruning and an early splitting strategy are applied to the quadtree structure of coding tree units (CTU) and residual quadtree (RQT). According to our experiment, when our method is applied to sequences from Class A to Class E, the coding time is decreased by 44% at the cost of a 1.08% Bjontegaard delta rate (BD-rate) increase on average.

정보통신 국책개발 기술의 상용화과정 특성에 관한 연구 (The Characteristics of commercialization process in government-sponsored information technology: Korean Case)

  • 이영덕
    • 기술혁신학회지
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    • v.5 no.1
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    • pp.26-43
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    • 2002
  • Korean government has been putting efforts to promote development of technologies by government sponsored labs and to transfer, diffuse, and commercialize these technologies in private sector since mid 1980s. In spite of these efforts, utilization of government-sponsored technology remains in the very low level. According to the survey conducted by Korea Intellectual and Patent Office (1999), the ratio of unused industrial property rights including patents was above 70% of total industrial property rights. Survey on the information and telecommunication industry done by the Institute of Information Technology Assessment (IITA) in 1999 shows that the utilization ratio of government-sponsored technologies is about 55.8%. This is especially true where government is not the primary or end-user of technologies. The purposes of this paper are to (1) identify a process model of technology commercialization, (2) develop the related variables of each step in the six-step continuous process model of government-sponsored technology commercialization, (3) empirically investigate the data gathered through questionnaire survey, and (4) suggest policy alternatives for promoting technology commercialization in Information and Telecommunication industries.

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An Improved Configuration for Radio over Fiber Transmission

  • Parvez, M.F.;Zhou, M.T.;Sharma, A.B.;Zhang, J.G.
    • 대한전자공학회:학술대회논문집
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    • pp.14-17
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    • 2002
  • A configuration for radio-over-fiber transmission, with remote LO delivery from the central office, and a simple, cost-effective, base station solution is proposed. It is shown that using practically available components, and even with a fiber dispersion of 17 ㎰/nm/km, it is possible to transmit, without repeaters, bit rates of up to 622 Mbit/s for about 20 km at a bit-error rate of 10$\^$-9/, with 0㏈m laser power and a modest optical gain of 6㏈. By increasing the optical gain to 25 ㏈, the link length can be increased to ∼80 km.

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u-건설 정보 서비스 구현을 위한 요소기술에 관한 연구 (The Study of Element Technologies to Realize u-Construction Information Service)

  • 이우식;남상관
    • 한국건설관리학회:학술대회논문집
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    • pp.602-605
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    • 2006
  • 최근, 유비쿼터스 컴퓨팅은 새로운 지식정보국가 건설과 자국의 정보 산업 경쟁력 강화를 위한 핵심 패러다임이라는 인식 하에 미국, 유럽, 일본의 정부 및 기업, 연구소들이 관련 기술에 대한 개발에 총력을 다하고 있다. 우리나라의 경우도 정부의 차세대 성장동력 산업의 주요 부분으로 유비쿼터스 기술을 제시하고 있으며, 국내 정부기관, 기업 또한 유비쿼터스 조기실현을 위한 노력을 경주하고 있는 실정이다. 따라서, 본 논문은 차세대 첨단 정보통신 기술로 부각되고 있는 유비쿼터스 환경을 건설분야에 효율적으로 적용하기 위한 기반 연구로써, 유비쿼터스환경하의 건설 프로세스의 변화양상과 단계별 정보 서비스 구현을 위한 필요한 요소기술들에 대하여 논하고자 한다.

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댁내통신설비의 운영환경에 관한 연구 (Study on the Operational Environment of Customer Premise Telecommunication Facilities)

  • 이영환;이상무;조평동;류명주;서태석
    • 한국정보통신학회:학술대회논문집
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    • pp.426-429
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    • 2001
  • 댁내통신설비는 통신망에서 중요한 역할을 한다. 현재 국내의 댁내통신설비에 대한 기술은 멀티미디어 환경을 반영하여 작성되었으나, 초고속정보통신망의 멀티미디어서비스를 수용하기 위해서는 미흡하다. 이에 본 논문에서는 댁내통신설비의 고도화를 위하여 운영환경요소를 분석하고 국내외 표준화 현황을 살펴보고 현재의 댁내통신설비의 운영환경에 대한 현장조사를 통한 문제점과 개선방안을 제시하였다.

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스마트/그린형 자동차의 위치정보시스템에 관한 연구 (A Study on Vehicular Positioning Technologies for Smart/Green Cars)

  • 노갑성;오준석;리앙동
    • 정보통신설비학회논문지
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    • v.9 no.3
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    • pp.92-101
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    • 2010
  • Energy efficiency and safe mobility are the two key constituents of the future automobile. The technologies that enable these features are now heavily dependent upon information and communication technology rather than traditional auto-mechanical technology. This paper presents an exploratory project 'Smart&Green Vehicle Project' at Western Michigan University which is to improve the geographical location accuracy of vehicles and to study various applications of making such location data available. Global Positioning System (GPS), Inertial Navigation System (INS), Vehicular Ad-hoc Network (VANET) technology, and data fusion among these technologies are investigated. Testing and evaluation is done on systems which will gather vehicular positioning data during GPS signal loss. Vehicles in urban settings do not acquire accurate positioning data from GPS alone; therefore there is a need for exploration into technology that can assist GPS in urban settings. The goal of this project is to improve the accuracy of positioning data during a loss of GPS signal. Controlled experiments are performed to gather data which aided in assessing the feasibility of these technologies for use in vehicular platforms.

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Authentication Technologies of X-ray Inspection Image for Container Terminal Automation

  • Kim, Jong-Nam;Hwang, Jin-Ho;Ryu, Tae-Kyung;Moon, Kwang-Seok;Jung, Gwang-S.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1684-1688
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    • 2005
  • In this paper, authentication technologies for X-ray inspection images in container merchandises are introduced and a method of authentication for X-ray inspection images is proposed. Until now, X-ray images of container merchandises have been managed without any authentication of inspection results and environments, it means that there was no any action for protection of illegal copy and counterfeiting of X-ray images from inspection results. Here, authentication identifies that who did inspect container X-ray images and, whether the container X-ray images were counterfeited or not. Our proposed algorithm indicates to put important information about X-ray inspection results on an X-ray image without affecting quality of the original image. Therefore, this paper will be useful in determining an appropriate technology and system specification for authentication of X-ray inspection images. As a result of experiment, we find that the information can be embedded to X-ray image without large degradation of image quality. Our proposed algorithm has high detection ratio by Quality 20 of JPEG attack.

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특허 분석을 통한 LBS 기술현황에 관한 연구 (A Study on the State-of-the-Art of LBS through Patent Analysis)

  • 조대수
    • 한국공간정보시스템학회 논문지
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    • v.8 no.3
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    • pp.65-75
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    • 2006
  • 위치기반서비스(Location-based Services: LBS)는 현재 이동통신 기술의 발달과 더불어 전 세계 이동통신시장에서 가장 활발하게 연구되고 있는 차세대 기술 분야이다. 국내에서는 최근 이동통신 회사에서 위치기반서비스에 기반을 둔 다양한 부가서비스를 제공하면서 위치기반서비스에 대한 높은 관심을 받고 있다. 위치기반서비스는 기술별로 위치측위기술, LBS플랫폼 기술, LBS 응용서비스 기술로 분류될 수 있다. 본 논문에서는 1991년부터 2005년까지 위치기반서비스의 기술 분야별로 출원 및 등록된 특허를 분석함으로서 위치기반서비스의 기술동향에 대해 살펴본다. 본 연구를 통해 분석된 결과는 LBS 기술 개발에 있어 중복을 방지하고, 기존 기술과의 차별화된 기술개발 방향을 모색하는데 유용하게 활용될 수 있을 것으로 기대된다.

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음성 전보 시스템 개발의 연구 동향 (On Reseach trends of Voice Telegram System(VTS))

  • 민소연;이수민;이순규;배명진
    • 대한전자공학회:학술대회논문집
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    • pp.1103-1106
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    • 1999
  • Telegram is an indispensible information & telecommunication system to our daily life. VTS(Voice Telegram System) under intensive research is intended to enhance exchanging capability of information & telecommunication by adding voice media to existing telegram system. Overall configuration and necessary core technologies of the system were investigated for its development. Among those many technologies in need, the technology of compressing and recording data is most critical to the development of cheap hardware. This is so called vocoder algorithm and is the core technology of voice information system. So, here, vocoder algorithm now being studied will be introduced.

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