• 제목/요약/키워드: Space Agency

검색결과 1,159건 처리시간 0.025초

우리나라 우주개발 정부 조직체제 개선방안 연구 (Study on Restructuring of Space Governance in Korea)

  • 황진영;김종범
    • 항공우주시스템공학회지
    • /
    • 제13권3호
    • /
    • pp.64-69
    • /
    • 2019
  • 본 연구는 우주개발 착수 30년을 맞이하고, 한국형 발사체의 시험발사체 발사 성공을 계기로 우리나라의 우주개발 체제 현황과 문제점을 살펴보고, 향후 우주개발의 효율적 추진을 위한 정부 추진 체제의 대안을 모색하고자 한다. 미국, 프랑스, 일본 등 주요국의 우주개발 추진체계를 행정조직 중심으로 살펴보고, 그에 따른 우리나라에의 시사점을 도출하고자 한다. 우리나라의 현황 분석은 우주관련 정부조직, 우주개발전문기관, 연구관리전문기관 등 거버넌스를 바탕으로 하며, 결과적으로 우주청 등 본격적인 논의 필요성을 제시하고 있다.

민/군 지구관측위성 개발 동향 및 향후 국내 위성사업 방향 (Development Trends of Civil/Military Earth Observation Satellite and Direction of Prospective Domestic Satellite Projects)

  • 정현재;최윤혁;황인영;서인호;김경근
    • 한국항공우주학회지
    • /
    • 제49권9호
    • /
    • pp.791-800
    • /
    • 2021
  • 본 논문은 우주 선진국 및 우리나라의 민/군 지구관측위성 개발 동향에 대해 조사하였으며, 국내 위성사업의 현황 및 향후 방향에 대해 기술하였다. 우주 선진국의 민/군 지구관측위성 개발 동향은 미국, 러시아, 프랑스, 독일, 이탈리아, 이스라엘, 중국 그리고 일본에 대해 조사하였으며, 이를 바탕으로 향후 지구관측위성 개발 방향에 대해 예측하였다. 일반적으로 위성 개발이라는 용어는 위성시스템을 구성하는 위성체, 지상체 및 발사체 등을 모두 포함하여 개발하는 개념으로 사용되지만, 본 논문에서는 위성 시스템이 아닌 위성체 자체의 개발을 중점으로 사용하였다.

THE NEXT-GENERATION INFRARED SPACE MISSION SPICA: PROJECT UPDATES

  • Nakagawa, Takao;Shibai, Hiroshi;Kaneda, Hidehiro;Kohno, Kotaro;Matsuhara, Hideo;Ogawa, Hiroyuki;Onaka, Takashi;Roelfsema, Peter;Yamada, Toru;SPICA Team
    • 천문학논총
    • /
    • 제32권1호
    • /
    • pp.331-335
    • /
    • 2017
  • We present project updates of the next-generation infrared space mission SPICA (Space Infrared Telescope for Cosmology and Astrophysics) as of November 2015. SPICA is optimized for mid- and far-infrared astronomy with unprecedented sensitivity, which will be achieved with a cryogenically cooled (below 8 K), large (2.5 m) telescope. SPICA is expected to address a number of key questions in various fields of astrophysics, ranging from studies of the star-formation history in the universe to the formation and evolution of planetary systems. The international collaboration framework of SPICA has been revisited. SPICA under the new framework passed the Mission Definition Review by JAXA in 2015. A proposal under the new framework to ESA is being prepared. The target launch year in the new framework is 2027/28.

Recent Activities in Space Environment Engineerings in Japan Aerospace Exploration Agency

  • Koshiishi, Hideki
    • 천문학회보
    • /
    • 제36권2호
    • /
    • pp.93.2-93.2
    • /
    • 2011
  • Japan Aerospace Exploration Agency (JAXA) has measured space environment and its effects on spacecraft and astronaut since 1987. At present, we have operated space environment monitors onboard one GEO spacecraft, one QZO spacecraft, and two LEO spacecrafts. The obtained space environment data has been gathered into the Space Environment and Effects System database (SEES, http://sees.tksc.jaxa.jp/). In this presentation, measurement result of space environment in low earth orbit obtained by the Daichi satellite from 2006 through 2011 is reported as well as recent activities in space environment engineerings in JAXA. The Technical Data Acquisition Equipment (TEDA) on board the Daichi satellite (Advanced Land Observing Satellite: ALOS) had been operated in low earth orbit at 700 km altitude with 98 degree inclination from February 2006 until April 2011. The TEDA consists of the Light Particle Telescope and the Heavy Ion Telescope. The operation period of the Daichi satellite was through the solar-activity minimum period. The space radiation environment around the Daichi satellite had been almost stable. However, large solar flares followed by CMEs sometimes disturbed the space radiation environment in the orbit of the Daichi satellite. In addition, high speed solar wind often flowed and modulated the electron flux in the horn region. On the other hand, a little variation was seen in the SAA region.

  • PDF

LUMINOSITY DEPENDENCE OF THE COVERING FACTOR OF THE DUST TORUS IN ACTIVE GALACTIC NUCLEI REVEALED BY AKARI

  • Toba, Yoshiki;Oyabu, Shinki;Matsuhara, Hideo;Ishihara, Daisuke;Malkan, Matt A.;Wada, Takehiko;Ohyama, Youichi;Kataza, Hirokazu;Takita, Satoshi;Yamauchi, Chisato
    • 천문학논총
    • /
    • 제32권1호
    • /
    • pp.193-195
    • /
    • 2017
  • We demonstrate the luminosity dependence of the covering factor (CF) of active galactic nuclei (AGNs), based on AKARI mid-infrared all-sky survey catalog. Combining the AKARI with Sloan Digital Sky Survey (SDSS) spectroscopic data, we selected 243 galaxies at $9{\mu}m$ and 255 galaxies at $18{\mu}m$. We then identified 64 AGNs at $9{\mu}m$ and 105 AGNs at $18{\mu}m$ by their optical emission lines. Following that, we estimated the CF as the fraction of type 2 AGN in all AGNs. We found that the CF decreased with increasing $18{\mu}m$ luminosity, regardless of the choice of type 2 AGN classification criteria.

THE AGN POPULATION IN THE AKARI NEP DEEP FIELD

  • Soto, Laia Barrufet de;White, Glenn J.;Pearson, Chris;Serjeant, Stephen;Lim, Tanya;Matsuhara, Hideo;Oi, Nagisa;Karouzos, Marios;AKARI-NEP Team
    • 천문학논총
    • /
    • 제32권1호
    • /
    • pp.271-273
    • /
    • 2017
  • The AKARI North Ecliptic Pole Deep Field is a natural location to accomplish deep extragalactic surveys. It is supported by comprehensive ancillary data extending from radio to X-ray wavelengths, which have been used to classify radio sources as radio-loud and radio-quiet objects and to create a catalogue of Active Galactic Nuclei (AGN). This has been achieved by using a radio-optical classification and colour-colour diagrams rather than the more usual way based on spectroscopy Furthermore, we explore whether this technique can be extended by using a far-Infrared (FIR) colour-colour diagram which has been used to identify 268 high redshift candidates.

Structural Analysis of Lift-Fan Rotor for Jet-VTOL Aircraft

  • Hojo, Masahiro;Ogawa, Akinori;Saito, Yoshio;Hashimoto, Ryosaku
    • 한국추진공학회:학술대회논문집
    • /
    • 한국추진공학회 2004년도 제22회 춘계학술대회논문집
    • /
    • pp.521-523
    • /
    • 2004
  • The Japan Aerospace Exploration Agency (JAXA) has proposed new vertical take-off and landing (VTOL) aircraft known as the Jet-VTOL aircraft shown in Fig.1. The Jet-VTOL aircraft is based on a canard wing configuration. The aircraft has the clustered lift-fans mounted near the center of gravity for vertical flight, and has the clustered fans mounted beside the vertical tail for cruise flight. Both fans are driven by the core engine mounted inside the aft end of fuselage. The propulsion system is innovative and attractive not to be seen even in the world.

  • PDF

창정 5B호 발사체의 재진입 시점 예측 분석 (Analysis of Reentry Prediction of CZ-5B Rocket Body)

  • 성재동;정옥철;정유연;정대원
    • 우주기술과 응용
    • /
    • 제1권2호
    • /
    • pp.149-159
    • /
    • 2021
  • 본 논문은 2021년 5월에 수행된 국제우주쓰레기조정위원회(IADC, Inter-Agency Space Debris Coordination Committee Reentry) 재진입 테스트 캠페인의 분석 대상인 중국 창정 5B호 발사체의 재진입 시점 예측 분석 내용을 포함하고 있다. 우주물체의 재진입 예측은 물체의 크기나 무게, 자세에 대한 정확한 정보의 부재, 대기밀도의 불확실성 등으로 정확한 예측이 어렵다. 때문에 IADC에서는 재진입 캠페인을 매년 수행하여 기관별 분석기법에 대한 검증을 수행하고 있고, 한국항공우주연구원에서도 2015년부터 이에 참여하고 있다. 본 연구에서는 우주물체가 재진입하는 시점을 예측하기 위해 탄도계수 최적화 기법을 제안하였고, 이를 활용하여 분석 대상의 재진입 시점을 예측한 결과, 실제 재진입 시점과 약 73초의 차이를 보여주어 제안한 기법의 정확도를 확인하였다.

ON THE INTERNATIONAL RADIO ASTRONOMY OBSERVATORY ON PLATEAU SUFFA

  • HOJAEV A. S.;SHANIN G. I.
    • 천문학회지
    • /
    • 제29권spc1호
    • /
    • pp.411-412
    • /
    • 1996
  • We present the update information on the International Radio Astronomy Observatory Suffa project and describe the original design of new 70-m radiotelescope RT-70 for millimeter astronomy as well. Some oreographic, seeing and climatic features of Suffa are also given.

  • PDF