• Annual Conference on Human and Language Technology
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• 2017.10a
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• pp.201-202
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• 2017

의료정보시스템의 상호운용을 위해 개발된 의료정보 교환 국제 표준인 HL7은 복잡한 구조와 문법으로 인해 컴퓨터 소프트웨어로 관리되고 있다. 현재 개발되고 있는 HL7 인터페이스 소프트웨어에서는 다양한 버전 간 호환이 되지 않아 의료정보시스템에서 버전 상호 간의 호환을 위해 변환 소프트웨어 모듈을 개발하여 사용한다. 그러나 다양한 버전(V2.1~V2.8)의 HL7 메시지 간 상호 변환을 위해 소프트웨어 모듈을 모두 개발하는 것은 많은 시간과 막대한 비용 및 노력이 필요한 비효율적인 방법이다. 따라서 본 연구에서는 HL7 버전 호환성 정의에 기반을 두어 버전별 상호변환이 가능한 HL7 파서(Parser)를 설계하고, 객체 지향적 구조에 기반을 두어 하위 버전과의 호환(Backward Compatibility)뿐만 아니라 상위 버전과 호환(Forward Compatibility) 가능한 파서를 제안한다. 또한, 버전 간 변환 실험을 통해 효용성을 검증하였다.

• 한국어정보학회:학술대회논문집
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• 2017.10a
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• pp.201-202
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• 2017

의료정보시스템의 상호운용을 위해 개발된 의료정보 교환 국제 표준인 HL7은 복잡한 구조와 문법으로 인해 컴퓨터 소프트웨어로 관리되고 있다. 현재 개발되고 있는 HL7 인터페이스 소프트웨어에서는 다양한 버전 간 호환이 되지 않아 의료정보시스템에서 버전 상호 간의 호환을 위해 변환 소프트웨어 모듈을 개발하여 사용한다. 그러나 다양한 버전(V2.1~V2.8)의 HL7 메시지 간 상호 변환을 위해 소프트웨어 모듈을 모두 개발하는 것은 많은 시간과 막대한 비용 및 노력이 필요한 비효율적인 방법이다. 따라서 본 연구에서는 HL7 버전 호환성 정의에 기반을 두어 버전별 상호변환이 가능한 HL7 파서(Parser)를 설계하고, 객체 지향적 구조에 기반을 두어 하위 버전과의 호환(Backward Compatibility)뿐만 아니라 상위 버전과 호환(Forward Compatibility) 가능한 파서를 제안한다. 또한, 버전 간 변환 실험을 통해 효용성을 검증하였다.

• ETRI Journal
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• v.31 no.4
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• pp.365-375
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• 2009

In this paper, a terrestrial digital multimedia broadcasting (T-DMB) multichannel audio broadcasting system based on spatial audio coding is presented. The proposed system provides realistic multichannel audio service via T-DMB with a small increase of data rate as well as backward compatibility with the conventional stereo-based T-DMB player. To reduce the data rate for additional multichannel audio signals, we compress the multichannel audio signals using the sound source location cue coding algorithm, which is an efficient parametric multichannel audio compression technique. For compatibility, we use the dependent property of an elementary stream descriptor, and this property should be ignored in a conventional T-DMB player. To verify the feasibility of the proposed system, we implement the T-DMB multichannel audio encoder and a prototype player. We perform a compatibility test using the T-DMB multichannel audio encoder and conventional T-DMB players. The test demonstrates that the proposed system is compatible with a conventional T-DMB player and that it can provide a promisingly rich audio service.

• Transactions of the Society of Information Storage Systems
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• v.1 no.1
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• pp.29-33
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• 2005

We have developed an optical pickup head for blu-ray disc. We have adopted a liquid crystal panel to compensate thickness difference of cover layer. By disposing DVD/CD compatible objective inside the BD objective in disc radial direction, we could realize a backward compatibility. Furthermore we have inserted a polarization diffractive optical element to reduce the influence from the other layer in BD dual layer.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.395-398
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• 2002

본 논문은 Global loaming, backward compatibility, 그리고 multi-standard가 요구되는 미래의 통신시스템에 대한 해답인 Software Defined Radio에 관한 글로서 SDR의 개념과, 그 접근 방법에 대해서 논하고자 한다. 특히 3세대 이동통신인 WCDMA system을 모델로 하여, 그 접근방법에 대해 살펴본다. SDR의 발전은 크기, 무게, 전력소모의 문제와, 전용의 하드웨어 없이 동작할 때의 성능저하를 문제를 해결해야 한다. 여기서 그 해결방안으로 SoC와 Multi-CPU의 방법을 제시하고자 한다.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.175-176
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• 2007

In this paper, we introduce Satellite Digital Multimedia Broadcasting(S-DMB) system and show the method increasing the channel capacity. To reduce the burden that has to change the existing system, the system has to be offered the Backward-compatibility. This paper show the method using hierarchical 16APSK modulation. And to obtain the reasonable BER performance between existing path(we call high priority) and additional path(we call low priority).

• Broadcasting and Media Magazine
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• v.15 no.1
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• pp.24-36
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• 2010

Nowadays, digital broadcasting providers have plan to extend their service area to 3D broadcasting without exchanging conventional system and equipments. The maintenance of backward compatibility to conventional 2D broadcasting system is very importance issue on digital broadcasting. To satisfy the requirement, highly-optimized MPEG-2 video encoder is essential for coding left-view and new video coding techniques having higher performance than MPEG-4 AVC/H.264 is needed for right-view since terrestrial broadcasting system has very limited and fixed bandwidth. In this paper, conventional video coding algorithms and new video coding algorithms are analyzed to present a capable solution for the best quality stereoscopic 3D broadcasting keeping backward compatibility within the bandwidth.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.69-75
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• 2010

Advanced T-DMB(Terrestial DMB )system which is a new portable mobile broadcasting system has been developed to increase data rate up to double of conventional T-DMB in same bandwidth while maintaining backward compatibility, using hierarchical modulation method. The Advanced T-DMB system realize high qualification of conventional T-DMB system by adding BPSK signal or QPSK signal as enhanced layer to existing DQPSK signal. The enhanced layer signal should be small enough to maintain backward compatibility and to minimize the coverage loss of existing T-DMB service area. But this causes the enhanced layer signal of Advanced T-DMB susceptible to fading effect in transmission channel. In this paper we applied the duo-binary turbo code which has powerful error correction capability to the enhanced layer signal for compensating channel distortion. And the computer simulation results about the performance of the duo-binary turbo code in Advanced T-DMB system are presented along with analysis comments.

• Journal of Broadcast Engineering
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• v.14 no.6
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• pp.721-732
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• 2009

AT-DMB system has been developed to increase data rate up to double of conventional T-DMB in same bandwidth while maintaining backward compatibility. The AT-DMB system adopted hierarchical modulation which adds BPSK signal or QPSK signal as enhanced layer to existing DQPSK signal. The enhanced layer signal should be small enough to maintain backward compatibility and to minimize the coverage loss of existing T-DMB service area. But this causes the enhanced layer signal of AT-DMB susceptible to fading effect in transmission channel. A turbo code which has powerful error correction capability is applied to the enhanced layer signal of the AT-DMB system for compensating channel distortion. We developed the prototype AT-DMB transmitter and receiver systems for performance evaluation. LAB test for analysing the effect of constellation ratio between existing base layer signal and enhancement layer signal, was conducted and the measurement results are shown with analysis comments.

• Journal of Broadcast Engineering
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• v.16 no.2
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• pp.360-371
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• 2011

T-DMB hybrid data service provides advanced data services while maintaining backward compatibility with legacy T-DMB receivers by using hybrid BIFS technology enabling distributed delivery of scene description information and object description information. This paper presents the hybrid service authoring framework implementing hybrid BIFS technology for creating contents for distributed delivery, and the results of experiments by using it. Hybrid service authoring framework is comprised of service creation system, service management system, and contents offering system. It enables the creation of combined hybrid data service and the splitting of the contents into two parts for ecah delivery network, data for broadcasting network and the data for mobile network. It also enables the managements of the contents. The feasibility of advanced data services while maintaining backward compatibility with the legacy T-DMB receiver has been proved by the contents created by using the hybrid authoring framework presented in this paper.