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구본준,안도섭,Ku, B.J.,Ahn, D.S. 한국전자통신연구원 2000 전자통신동향분석 Vol.15 No.5
WRC-2000 회의를 계기로 성층권 통신시스템용 주파수가 새롭게 분배됨에 따라 정보통신 인프라가 취약한 후진국 및 개도국뿐만 아니라 여러 선진국들을 중심으로 성층권 비행선을 이용한 통신 및 무선응용 서비스의 활용에 대해서 관심이 점점 높아지고 있다. 본 논문에서는 성층권 통신시스템의 개요를 소개하고 WRC-2000 회의의 HAPS(High Altitude Platform Station) 관련 주요 의제 및 진행 경과와 결과를 중심으로 국제 표준화 동향을 알아보고자 한다. 그리고 현재 미국, 일본 및 유럽 등 몇몇 기술 선진국을 중심으로 진행되고 있는 성층권 통신시스템 개발과 관련하여 기술 개발 동향에 대해서 살펴보고 성층권 통신시스템(HAPS)의 기대효과 및 향후 전망에 대해서 논의하고자 한다.
구본준,안도섭,오대섭 한국통신학회 2008 정보와 통신 Vol.25 No.9
본고에서는 위성 통신의 장점과 지상 통신의 장점을 갖춘 고고도 통신 (HAPS : High Altitude Platform Station) 기술에 대한 국내외 개발 동향을 알아본다. 이를 위하여 유럽 및 일본 등 국외 개발기관에서의 플랫폼 및 통신시스템 기술개발 동향과 국제표준기구인 ITU-R(International Telecommunication Union - Radiocommunication sector)에서의 HAPS 운용을 위한 관련 결의서 및 권고서 개발 등의 표준 개발 동향을 중심으로 분석 한다.
구본준,이승민,박종민,안도섭,Ku, B.J.,Lee, S.M.,Park, J.M.,Ahn, D.S. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.3
본 고는 2005년 4월 20일부터 28일까지 튀니지 튀니스에서 개최된 ITU-R WP9B 회의에서 논의되었던 HAPS 관련 간섭 및 공유 연구현황과 관련 기술에 대해서 제출된 기고서 및 회의 결과를 중심으로 살펴보고자 한다. 본 회의에 제출된 기고서의 주된 내용은 HAPS에서 고정업무(FS)로의 간섭평가 방법에 대하여 제안된 것으로, 여기에서FS는 RRS와 FWA 시스템을 포함한다. 본 간섭 연구에 대한 제안 배경과 제안 사항의 개요에 대해서 기술하고 간섭분석 모델과 그것에 대한 시뮬레이션 결과를 제시한다. 결론에서 향후 본 분야에 대한 우리나라의 대응방안에 대해서 기술한다.
구본준,Ku, Pon-chun 한국기술사회 2008 技術士 Vol.41 No.6
Exam administration agreement was signed by the Korean Professional Engineers Association (KPEA) and the National Council of Examiners for Engineering and Surveying (NCEES) at the 2nd National Convention of Professional Engineers on 6 September 2008. Korean engineers can take U.S. Professional Engineer examination under proctor of KPEA in Korea from next April. It helps to broaden for Korean young engineers to have a chance to work and to be recognized as a professional engineer in the U.S. This is a brief introduction of U.S. Professional Engineer system and examination.
구본준,오대섭,B.J. Ku,D.S. Oh 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.1
Recently, preparations for 6G have led to the increasing interest in integrated or hybrid communication networks considering low-orbit satellite communication networks with terrestrial mobile communication networks. In addition, the demand for frequency allocation for new mobile services from low-orbit small satellites to provide global internet of things (IoT) services is increasing. The operation of such satellites and terrestrial mobile communication networks may inevitably cause interference in adjacent bands and the same band frequency between satellites and terrestrial systems. Focusing on the results of the recent ITU-R WP4C meeting, this study introduces the current status of frequency sharing and interference issues between satellites and terrestrial systems, and frequency allocation issues for new mobile satellite operations. Coexistence and compatibility studies with terrestrial IMT in L band and 2.6 GHz band, operated by Inmassat and India, respectively, and a new frequency allocation study (WRC-23 AI 1.18) are carried out to reflect satellite IoT demand. For the L band, technical requirements have been developed for emission from IMT devices at 1,492 MHz to 1,518 MHz to bands above 1,518 MHz. Related studies in the 2 GHz and 2.6 GHz bands are not discussed due to lack of contributions at the recent meeting. In particular, concerning the WRC-23 agenda 1.18 study on the new frequency allocation method of narrowband mobile satellite work in the Region 1 candidate band 2,010 MHz to 2,025 MHz, Region 2 candidate bands 1,695 MHz to 1,710 MHz, 3,300 MHz to 3,315 MHz, and 3,385 MHz to 3,400 MHz, ITU-R results show no new frequency allocation to narrow mobile satellite services. Given the expected various collaborations between satellites and the terrestrial component are in the future, interference issues between terrestrial IMT and mobile satellite services are similarly expected to continuously increase. Therefore, participation in related studies at ITU-R WP4C and active response to protect terrestrial IMT are necessary to protect domestic radio resources and secure additional frequencies reflecting satellite service use plans.
구본준,성재현 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.8 No.1
The purpose of this study was to investigate the effects of the High Pull J-hook Headgear in retraction the maxillary 4 incisors. The maxillary part of a dry skull that had Angle's Class Ⅱ malocclusion and axes of the central incisors were 60 degrees to the occlusal plane was duplicated with epoxy resin. In this epoxy resin model, the maxillary 4 incisors were retracted by the 1㎜ activated vertical closing loop, High Pull J-hook Headgear with a directional force of 34 degrees to the occlusal plane and 600g in total force, and both of them. The obtained stress distributions around the roots were analysed by three dimensional photoelastic method. The results were as follows; 1. When the maxillary 4 incisors were retracted by the 1㎜ activated vertical closing loop, simple lingual tipping movement patterns were shown. 2. When the maxillary 4 incisors were retracted by the High Pull J-hook Headgear with a directional force of 34 degrees to the occlusal plane and 600g in total force, intrusive bodily movement patterns were shown. 3. When the maxillary 4 incisors were retracted by the 1㎜ activated vertical closing loop and the High Pull J-hook headgear with a directional force of 34 degrees to the occlusal plane and 600g in total force, simple lingual tipping movement patterns and intrusive bodily movement patterns were shown in the same time. J. Kyungpook. Nat. Univ. Sch. Dent. Vol.8, No.1, 91∼103, 1991.