• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2001.06a
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• pp.213-216
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• 2001

The H.263 Annex I method for the intraframe coding is based on the prediction in DCT domain, unlike JPEG, MPEG-1, and MPEG-2 where the intraframe coding uses block DCT, independent of the neighboring blocks. In this paper, we show the ineffectiveness of H.263 Annex I prediction method by mathematically deriving the spatial domain meaning of H.263 Annex I prediction method. Based on the derivation, we propose a prediction method which is based on the spatial correlation property of image signals. From the experiment and derivation, we verified the proposed method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.6C
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• pp.619-625
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• 2009

This paper proposes a parallel architecture of a Parity Checksum Generator adopted for packet synchronization and error detection in the ITU-T Recommendation J.83 Annex B. The proposed parallel processing architecture removes a performance bottleneck occurred in a conventional serial processing architecture, leading to significant decrease in processing time for generating a Parity Checksum. The implementation results show that the proposed parallel processing architecture reduces the processing time by 83.1% at the expense of 16% area increase.

• Journal of The Korea Institute of Healthcare Architecture
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• v.14 no.1
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• pp.7-20
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• 2008

This study is an analysis of the characteristics between the remodeling of an existing hospital and the remodeling of an existing hospital with the addition of a new annex. The comparison of the two remodeling methods focused on the difference of gross area, circulation system, improvement of hospital function, profitability of remodeling construction, and so on. The result of this study can be summed up as follows. The remodeling of an existing hospital with a new annex has the merit of enlarging new areas, promoting the function of the hospital, changing the inner circulation system, and facilitating the construction. However, it has the demerit of requiring too much money and expanded space for the construction. Therefore, it is possible to use the existing hospital remodeling method for small scale hospitals that do not have many patients, but it would be necessary for big scale hospitals with many patients to adopt the method of remodeling the existing hospital with the addition of an annex.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.8B
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• pp.1168-1175
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• 2001

H.263부호기에서 정지영상 부호화를 위한 부가 부호기법인 Annex I는 기존의 JPEG, MPEG-1, -2와는 달리 부호화하고자 하는 현재 블록의 DCT 계수를 기부호화된 블록의 DCT 계수들을 이용하여 예측부호화 (Differential Pulse Coded Modulation; DPCM)를 행하고, 이를 통한 부호화 이득의 향상을 얻고 있다. 본 논문에서는 이런 H.263 Annex I의 예측기법을 공간영역에서의 의미를 수학적으로 유도한다. 이를 통해서 H.263 Annex I의 예측기법의 비효율성을 지적하고, 영상신호의 특성에 맞게 예측방식을 수정한다. 제안된 DCT 계수 예측 방식과 기존의 H.263 Annex I 방식의 이론적인 예측성능을 평가하고, H.263 부호기에 적용하여 제안방식의 효율성을 검증한다.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.693-699
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• 2013

In this paper, ${\pi}/4$-DQPSK modem according to ITU-R M.1842-1 recommendation Annex1 is investigated and simulated. At first, standardization and technical trend of VHF maritime mobile communication are introduced. The ${\pi}/4$-DQPSK modem defined in the Annex1 should support 28.8Kbps bit transmission rate within 25KHz frequency bandwidth. We describe the system model and simulation process of ${\pi}/4$-DQPSK modem transmitter and receiver design with RRC(Root Raised Cosine) transmitter and receiver filter. Then we suggest various graphical simulation results(time domain signals, constellation, power spectral density according to roll-off factor, eye diagram), and show simulated BER performance of the modem. From the simulation results, it is shown that roll-off factor of RRC filter affects to BER performance according to SNR and the designed simulation model meets the spectrum mask requirement suggested in ITU-R M.1842-1 recommendation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2249-2260
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• 2017

IMO (International Maritime Organization) has been providing GMDSS (Global Maritime Distress and Safety System) and mandating to install distress and safety systems according to SOLAS. Digital-HF(High-Frequency) coast station communication system maintains interoperability between ship and coast station and digital data exchange in maritime mobile service by digitizing existing analog base voice communication. In this paper, we analyze ITU-R M. 1798-1 established by ITU for digital HF communications and propose Advanced annex2 and new Annex 5 to improve the problems of the existing Annex 2 and Annex 4. The proposed OFDM protocol basically adopts ARQ (Automatic Retransmission Request) which retransmits when an error occurs in a half-duplex manner between an information transmitting side (ISS) and an information receiving side (IRS) and we propose a digital HF communication system and its operational concept which is more reliable and superior than the existing ITU-R M. 1798 by implementing technical development on implementation and performance improvement.

• The Korean Journal of Air & Space Law and Policy
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• v.28 no.2
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• pp.97-115
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• 2013

The world-wide principal criteria of aircraft operations is ICAO Annex 6. Operations of Aircraft. Among ICAO Annex 6, Part I is for International Commercial Air Transport - Aeroplanes and it assumes major part of civil aviation. ICAO has been providing Contracting States with SARPs(Standards and Recommended Practices) and monitor each State's reflection degree into their domestic air law, so-called USOAP(Universal Safety Oversight Audit Program). Current ICAO USOAP is Snap-shot method, but it will be changed to USOAP-CMA method from the year of 2013. ICAO USOAP results have overall effects on national aviation industry such as routes, insurance, airlines cooperation and so forth. Low grades of results attract international attention and that leads to flag carrier's operation stoppage, route restriction, airlines cooperation restriction, insurance increase directly or indirectly. Thus it is important to get excellent grades in ICAO USOAP and to maintain confidence. Our government ranked top to get 98.89 grades in 2008 ICAO USOAP but after 2008 the revised provisions have not been reflected sufficiently into our air law. So I would like to grip reflection ratio of ICAO Annex 6 Part I into our domestic air law by using the most updated revised edition on this paper. Together I would like to suggest alternatives for the non-reflected and partially reflected.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.211-211
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• 2004

• Polymer Science and Technology
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• v.9 no.4
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• pp.274-282
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• 1998

• New & Renewable Energy
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• v.3 no.4
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• pp.104-113
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• 2007

교토의정서(Kyoto Protocol)의 발효로 전 세계적으로 에너지절약형 산업구조로의 전환 및 신재생에너지 개발 등의 온실가스 감축을 위한 노력이 활발하게 진행되고 있으며, 우리나라 또한 온실가스 저감을 피할 수 없게 되었다. 특히 선진국(Annex I)의 구속력 있는 감축목표를 규정하고 있는 교토의정서의 의무이행에 유연성을 부가하기 위해 교토메카니즘이 채택되었다. 교토 메카니즘은 CDM(Clean Development Mechanism), JI(Joint Implementation), ET(Emission Trading)로 이루어져 있으며, 이 가운데 CDM 사업은 선진국(Annex I)과 개발도상국 non-Annex I)간 공동 협력 사업으로 non-Annex I 국가인 우리나라가 참여할 수 있기 때문에 국내 기업 및 정부의 관심이 높아지고 있다. 이러한 CDM 사업을 수행하기 위해서는 적용 가능한 CDM 사업 방법론이 필요하며, 방법론이 없을 경우 CDM 사업 방법론을 개발하여야 한다. CDM사업 방법론에는 레이스라인, 추가성, 배출 감축량, 모니터링 등에 대한 구체적인 방법이 제시되어야 하고 사업 수행자는 사업의 타당성 확인 및 검증을 위해 방법론을 정확히 이해해야 한다. 따라서 본 CDM사업 방법론 연구를 통해 CDM사업 수행 및 방법론 개발을 위한 주요 항목의 이해를 돕고 국내 CDM 사업의 활성화를 도모하고자 한다.