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  • Title/Summary/Keyword: 디지털 정보환경

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A New Coding Technique for Scalable Video Service of Digital Hologram (디지털 홀로그램의 적응적 비디오 서비스를 위한 코딩 기법)

  • Seo, Young-Ho;Bea, Yoon-Jin;Lee, Yoon-Hyuk;Choi, Hyun-Jun;Yoo, Ji-Sang;Kim, Dong-Wook
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.9
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    • pp.92-103
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    • 2012
  • In this paper, we discuss and propose a new algorithm of coding technique for scalably servicing holographic video in various decoding environment. The proposed algorithm consists of the hologram-based resolution scalable coding (HRS) and the light source-based SNR scalable coding (LSS). They are classified by the method generating and capturing hologram. HRS is a scalable coding technique for the optically captured hologram and LSS is one for the light source before generating hologram. HRS can provide the scalable service of 8 steps with the compression ratio from 1:1 to 100:1 for a 1,024×1,024 hologram. LSS can also provide the various service depending on the number of the light source division using lossless compression. The proposed techniques showed the scalable holographic video service according to the display with the various resolutions, computational power of the receiving equipment, and the network bandwidth.

System of Agricultural Land Monitoring Using UAV (무인항공기를 이용한 농경지 모니터링 시스템)

  • Kang, Byung-Jun;Cho, Hyun-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.6
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    • pp.372-378
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    • 2016
  • The purpose of this study is to develop a system configuration for gathering data and building a database for agriculture. Some foreign agriculture-related companies have already constructed such a database for scientific agriculture. The hardware of this system is composed of automatic capturing equipment based on aerial photography using a UAV. The software is composed of parts for stitching images, matching GPS data with captured images, and building a database of collected weather information, farm operation data, and aerial images. We suggest a method for building the database, which can include information about the amount of agricultural products, weather, farm operation, and agricultural land images. The images of this system are about 5 times better than satellite images. Factors such as farm working and environmental factors can be basic data for analyzing the full impact of agriculture land. This system is expected to contribute to the scientific analysis of Korea's agriculture.

Design and Implementation of TV-Anytime System based on Digital Cable Television (디지털 케이블방송 기반 TV Anytime 시스템 설계 및 구현)

  • Park, Min-Sik;Lee, Han-Kyu;Hong, Jin-Woo
    • Journal of Broadcast Engineering
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    • v.12 no.4
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    • pp.321-332
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    • 2007
  • The digitalization of a broadcast has caused the oversupply of the contents in order to fit the user's needs for various broadcast services. The massive contents could not help demanding one-sided watching without considering a taste and preference of a user. This situation is enlarging the demand about the personalized broadcast service to enable user to watch broadcast contents in anytime according to surplus provision of broadcast contents. TV-Anytime standard could be a solution for broadcast service to enable users to watch personalized broadcast contents according to their preference. The paper proposes the personalized broadcasting system for authoring, receiving and transmission of TV-Anytime metadata, the detailed information about the broadcast contents so that user could efficiently search a large of broadcast contents stored in the PDR(Personal Digital Recorder)receiver under the DCATV(Digital Cable Television) environment.

Security Criteria for Design and Evaluation of Secure Plant Data Network on Nuclear Power Plants (원전 계측제어계통의 안전 네트워크 설계 및 평가를 위한 보안 기준)

  • Kim, Do-Yeon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.2
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    • pp.267-271
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    • 2014
  • Nuclear power plant data networks and their associated safety systems are being modernized to include many information technology (IT) networks and applications. Along with the advancement of plant data networks (PDN), instrumentation and control systems are being upgraded with modern digital, microprocessor-based systems. However, nuclear PDN is confronted significant side-effects, which PDN is exposed to prevalent cyber threats typically found in IT environments. Therefore, cyber security vulnerabilities and possibilities of cyber incidents are dramatically increased in nuclear PDN. Consequently, it should be designed fully ensuring the PDN meet all reliability, performance and security requirements in order to overcome the disadvantages raised from adaption of IT technology. In this paper, we provide technical security criteria should be used in design and evaluation of secure PDN. It is believed PDN, which is designed and operated along with these technical security critera, effectively protect against possible outside cyber threats.

Design of Embedded Based Distributed RFID Gateway Using Open Source Hardware (오픈 소스 하드웨어를 이용한 임베디드 기반의 분산형 RFID 게이트웨이의 설계)

  • Jeon, Jun-Cheol
    • Journal of Advanced Navigation Technology
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    • v.19 no.6
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    • pp.581-586
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    • 2015
  • In this paper, we configure a Radio Frequency IDentification (RFID) gateway using an arduino and raspberry pi which are recent issues with a representative open source hardware. RFID technology is emerging as a key technology in a variety of environments as a technique to automatically identify objects using a radio frequency signal. In this paper, we propose a distributed RFID gateway for providing various communication methods and processing a large amount of RFID tag information efficiently, and to increase the scalability and middleware communication efficiency of the RFID reader. Existing RFID middleware systems have the problems that they should adhere the web service for interworking with a reader and the communication standard. Therefore, in this paper, we comprise our RFID gate to satisfy not only the serial communication configuration but also various digital signal processing standard so that it increases the communication efficiency of the middleware system.

The Development of Integration Electronic Block System for Maintenance Efficiency on Railway Wayside Signalling System (철도 선로변 신호설비 유지보수 효율화를 위한 집중형 전자폐색제어장치 개발)

  • Baek, Jong-Hyen;Jo, Hyun-Jeong;Kim, Yong-Kyu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.9
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    • pp.4171-4176
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    • 2012
  • The conventional block systems for railway signaling currently in operation in Korea have not been electrified or integrated and therefore there have been difficulties in terms of construction and maintenance. Two independent systems have been installed for ABS and LEU of ATP system (for speeded-up lines), although they deal with the same signaling information at the same location in order to control the trains. In these conventional ABS and LEU, a number of duplicate modules are installed in each device including lamp detection units and power supply units and it results increased manufacturing costs and maintenance efforts. This paper deals with the prototype development of integrated electronic block system with CPU-based digital control methods in order to overcome the limitations of the conventional ABS. The suggested system is the integration of the conventional ABS with LEU of ATP and it is also applicable for the non-ATP sections as well.

Design and Implementation of Interference-Immune Architecture for Digital Transponder of Military Satellite (군통신위성 디지털 중계기의 간섭 회피 처리 구조 설계 및 구현)

  • Sirl, Young-Wook;Yoo, Jae-Sun;Jeong, Gun-Jin;Lee, Dae-Il;Lim, Cheol-Min
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.7
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    • pp.594-600
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    • 2014
  • In modern warfare, securing communication channel by combatting opponents' electromagnetic attack is a crucial factor to win the war. Military satellite digital transponder is a communication payload of the next generation military satellite that maintains warfare networks operational in the presence of interfering signals by securely relaying signals between ground terminals. The transponder in this paper is classified as a partial processing transponder which performs cost effective secure relaying in satellite communication links. The control functions of transmission security achieve immunity to hostile interferences which may cause malicious effects on the link. In this paper, we present an efficient architecture for implementing the control mechanism. Two major ideas of pipelined processing in per-group control and software processing of blocked band information dramatically reduce the complexity of the hardware. A control code sequence showing its randomness with uniform distribution is exemplified and qualification test results are briefly presented.

An Experimental Study on the FRBR Model Adaptation to KORMARC Database : Focusing on Music Materials (FRBR 모형의 KORMARC 데이터베이스로의 적용 가능성에 대한 실험적 연구 - 음악자료를 중심으로 -)

  • Kim, Hyun-Hee;Yoo, Yeong-Jun;Park, Suh-Eun
    • Journal of Korean Library and Information Science Society
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    • v.38 no.2
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    • pp.185-202
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    • 2007
  • This study examines the application of the FRBR model to an integrated KORMARC format using music materials. To do this, first, we analysed an integrated KORMARC format as well as a KORMARC format for audiovisual materials and then based on its analysis results, constructed an algorithm that allows the transformation from KORMARC to FRBR. Second, we used the algorithm to see whether it fits to the existing KORMARC database. Three suggestions were proposed to support the application of the FRBR model on existing integrated KORMARC library catalogues. This study results can be used not only to improve digital library interfaces but also as basic data in revising cataloging rules for the adaptation of the FRBR model.

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Exploratory Study on Christian Education through Hybrid Education System in Christian Universities (기독교 대학에서의 하이브리드 교육을 통한 기독교교육 가능성 탐색)

  • Bong, Won Young
    • The Journal of the Korea Contents Association
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    • v.14 no.6
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    • pp.513-528
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    • 2014
  • The landscape of Christian higher education is changing. Students once spent most of their time in a traditional classroom with a professor, but now they take online and hybrid courses (face to face and online). Some students complete their entire degree in a fully online program. Nearly every type of college in the United States offers online courses. Online learning has clearly moved from a fad to a fixture, and nowhere is that more apparent than at one of the largest universities in the country. As the demand for online course and programs increase, teachers and administrators in Christian universities and colleges face new challenges. Even though some teachers and administrators still believe online education is inferior to traditional face-to-face learning, we found no statistically significant differences in standard measures of learning outcomes between students in the traditional classes and students in the hybrid-online format classes. In this situation, since online education will develop continuously, Christian universities should utilize it variously through complete understanding and research about it predicting the future of online education style.

The Efficient Detection Algorithm of Various CR signals using Channel Bonding in TV White Space (TV White Space에서 채널 본딩된 다양한 CR 시스템의 효율적인 검출 알고리즘)

  • Lim, Sun-Min;Jung, Hoi-Yoon;Jeong, Byung-Jang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.5A
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    • pp.536-542
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    • 2011
  • For efficient utilization of spectrum resources in TV white space after DTV transition, FCC allowed usage of the spectrum for CR system. The CR system is required to cognize channel usage state for utilizing the unused spectrum in TV white space which coexists various primary and secondary systems. In the meantime, as a demand for high throughput communication had been increased recently, CR systems also consider to adopt channel bonding technology, thus spectrum sensing for channel bonded system is essentially required. In this paper, we propose a novel spectrum sensing algorithm for channel bonding system using a single channel receiver. For IEEE 802.l1af signal, the proposed algorithm provide detection probability of 90% with false alarm probability 10% at SNR -18dB for single channel system and at SNR -7dB for 8 channel bonded system, respectively. Utilizing the proposed scheme, we can detect channel bonded signal using only a single receiver, therefore system overhead for spectrum sensing can be reduced significantly.