• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.8
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• pp.860-872
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• 2013

In this paper, reasonable and effective building strategies of PPDR network is presented through investigating and analysing current policies for PPDR network of Korea and foreign countries. The research result shows that it is necessary PPDR network is designed and implemented considering currently transient status in aspects of PPDR-related technical roadmaps and existing PPDR networks. Also, in the transient period of more than 5 years, mobile broadband- based private PPDR network should be builded and it should be complemented by some commercial networks such as TRS or other mobile broadband networks.

• Journal of IKEEE
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• v.27 no.4
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• pp.579-586
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• 2023

Device-to-Device communication is a very important essential feature in PPDR(Public Protection Disaster Relief) communication, but it has not yet been implemented in LTE-based PPDR communication. In this study, we propose a solution to implement the LTE-based domestic PPDR communication network by evolving the terminals into D2D in-band terminals and effectively operating the current PS-LTE terminals and digital radios in the transitional period.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37A no.10
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• pp.858-864
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• 2012

In South Korea, to effective and systematic response to disasters, the government will build wireless communication network for PPDR(Public Protection and Disaster Relief) on a national level by 2015. To do it, as MOPAS(Ministry of Public Administration and Security) requested the new frequency assignment for PPDR, KCC(Korea Communications Commission) has been examined new frequency allocations about TETRA and WiBro technologies. In this paper, we were defined the technical parameters, were estimated the spectrum of TETRA-TRS requirements for Korean wireless communication of PPDR based on M.2033 methodology recommended by ITU-R.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.209-216
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• 2011

For Effective and systematic response to disasters, needs of broadband multimedia services in wireless communication of PPDR(public protection and disaster relief) is increasing gradually. Recently in Korea, by the digital television transition, Korea Communications Commission is considering whether the freed spectrum can assign additional spectrum of PPDR or not. In this paper, we were defined the input parameters, were estimated the spectrum of requirements for Korean wireless communication of PPDR based on M.1390 methodology recommended by ITU-R.

• Information and Communications Magazine
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• v.33 no.3
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• pp.3-10
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• 2016

최근 광대역 방식의 PPDR 시스템 도입 필요성이 증대함에 따라 관련 국제기구, 지역기구, 국가를 중심으로 광대역 PPDR 도입 방안을 검토했으며, 현재 일부 국가들은 망 구축을 시작하고 있는 상황이다. 국제기구인 ITU를 중심으로 요구사항, 주파수, 기술방식 등에 관한 연구가 진행되었으며, 유럽, 이시아-태평양 지역기구도 지역기구 입장에서 관련 사항 연구를 추진했다. 최근 WRC-15회의가 끝남에 따라 주파수는 700MHz대역과 800MHz대역이 국제적 공통주파수로 결정되었고, 기술방식은 대부분의 국가에서 PS-LTE가 채택되었거나 우선적으로 검토되고 있다. 망 구축 방식은 국가별 상황에 따라 상용망, 혼합망 등이 검토, 추진되고 있다. PS-LTE 구축 사례로서 미국은FirstNet이 2012년에 설립되어 현재 RFP발행을 위한 마지막 단계에 있으며, 영국은 사업자 선정을 앞두고 있어 2017년부터 망 구축이 추진될 것으로 전망된다, 호주는 800MHz대역에서 LTE방식으로 활용할 계획이나 구체적인 주파수나 망 구축방식은 정해지지 않은 상태이다.

• Journal of Broadcast Engineering
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• v.20 no.1
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• pp.82-91
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• 2015

The purpose of this paper is to propose the frequency allocation plan for the terrestrial UHDTV in 700MHz frequency band. Currently 700MHz frequency band is being requested by broadcasting, communication, and public safety sites for the use of UHDTV, LTE/LTE-A and PPDR (Public Protection and Disaster Relief) by each site. Validity and proper timing of each request is examined by references, and the frequency allocation plan is proposed. As results 9 channels and guard bands are allocated for the UHDTV service, under the consideration of two 10MHz frequency bands of the PPDR in700MHz band.

• Journal of the Korean Society of Food Science and Nutrition
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• v.7 no.1
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• pp.1-6
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• 1978

Muscle fillets of flounder, Limanda herzensteini, were sliced into small pieces and dehydrated by the methods of sun drying, hot air drying and vacuum freeze drying, and evaluated for the protein quality by the method of shortened pepsin pancreatin digest residue (SPPDR) index which is the modified method of shortened pepsin digest residue index. In the analysis of the muscle protein hydrolysates, glutamic acid, aspartic acid and lysine comprised about 39% of the total amino acids of the protein. The content of pure protein in flounder muscle was 18.8%. The result of nutritional evaluation of the dried muscle protein by the computation of the SPPDR index showed that the freeze dried flounder muscle protein was superior in the nutritional efficiency to the others, sun dried. The freeze dried flounder muscle protein marked 89 of the SPPDR index number which is quite similar to the muscle protein of terrestrial animal in nutritional quality.

• Information and Communications Magazine
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• v.33 no.3
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• pp.11-19
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• 2016

본고에서는 유럽의 PPDR-TC(Public Protection Disaster Relief- Transformation Center)에서 연구한 연구결과를 토대로 광대역 재난통신망 구축을 위한 다양한 고려사항들과 적용 기술들의 특징을 살펴보고, 도출된 여러 가지 진화 경로에 대한 장단점을 분석해본다. 이러한 분석 결과를 토대로 현재 국가재난안전통신망 구축을 추진 중인 우리나라의 입장에서 참조할 점이 무엇인지 제시하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.6
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• pp.1266-1272
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• 2013

This paper calculates estimated number of cell sites to build a nationwide PPDR(Public Protection and Disaster Relief) network of WiBro and LTE technical methods through a link budget calculation, presents the efficient technical method through a comparison between the number of cell sites using WiBro and LTE. As a calculation results, the number of cell sites using WiBro method are larger than twice compared to that of LTE method on the same frequency bands, due to the differences of uplink PAPR, uplink transmission technique and SINR. On the basis of the result, LTE mothod is considered as a more effective technology than the WiBro method on the economic, technical and marketing points of views on building a nationwide network.

• Electronics and Telecommunications Trends
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• v.27 no.2
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• pp.31-40
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• 2012

광대역 통신 기술은 일반 사용자를 대상으로 고속의 데이터 전송 및 고품질의 음성통화와 영상통화 등을 포함하는 멀티미디어 서비스 제공을 위해 발전 중이다. 나아가 국민의 안전과 생명보호를 위한 공공안전 및 재난구조(PPDR, Public Protection and Disaster Relief)를 위한 범국가적 통신망과 원격 감시, 측정, 보고 및 제어 등을 위한 스마트그리드(smart grid) 및 M2M(Machine-to-Machine) 통신을 위한 광대역 통신망 구축이 기대된다. 본고에서는 공공안전 및 재난구조 통신과 M2M 통신 응용을 지원하는 광대역 무선접속 표준화 동향과 기술 개념을 살펴보고자 한다.