• Title/Summary/Keyword: 방사(放飼)

Search Result 17,086, Processing Time 0.052 seconds

Non-Radiative Dielectric(NRD) Rotman Lens with Gap-Coupled Unidirectional Dielectric Radiator(UDR) (갭 결합된 단향성 유전체 방사체를 적용한 비방사 유전체 로트만 렌즈)

  • 이재곤;이정해
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.14 no.12
    • /
    • pp.1269-1275
    • /
    • 2003

  • In this paper, nonradiative dielectric(NRD) rotman lens with a gap-coupled unidirectional dielectric radiator(UDR) has been designed. Gap-coupled UDR is structurally suitable for NRD rotman lens. We have optimized NRD rotman lens for minimizing side-lobe, and calculated design parameters of UDR such as length of resonator and distance of gap using an equivalent circuit model of an evanescent NRD guide. Experimental prototype of UDR is fabricated and measured at the center frequency of 38 GHz. The simulated S-parameter and far-field radiation beam pattern of UDR show good agreements with measured data. Finally, total beam pattern of NRD rotman lens of multi-beam feed has been obtained using a measured pattern of UDR and array factor of NRD rotman lens. The obtained beam pattern shows remarkably suppressed side-lobe.

  • PDF KSCI

Review and Application of the Radioactive Waste Certification Program (방사성폐기물 인증프로그램의 검토 및 적용)

  • Chung Hee-Jun;Whang Joo-Ho;Lee Jae-Min;Kim Heon;Jeong Yi-Yeong
    • Proceedings of the Korean Radioactive Waste Society Conference
    • /
    • 2005.11a
    • /
    • pp.126-133
    • /
    • 2005

  • Securing of radioactive waste disposal site and the related operations for disposal of low and intermediate level radioactive waste is being actively carried out in Korea. For disposal of radioactive wastes, physicochemical and radiological status and integrity of radioactive wastes must be secured first. Also, waste generators must provide this information to disposers. In addition, to secure the safety of waste disposal, waste acceptance criteria (WAC) and site specific waste acceptance criteria (SWAC) to consider characteristics of the disposal site are required. Radioactive wastes must be processed, generated, managed and transferred in accordance with these criteria. [1] For this, evaluation of properties on each of the radioactive wastes must be performed. However, in reality, atomic power plants are experiencing difficulties in relation to this due to the large quantity of radioactive waste generation. In order to solve this problem, IAEA and major overseas countries have developed, thus are using waste certification program (WCP) and quality assurance program (QAP) [2,3]. On the basis of these programs, radioactive waste certification program has been developed for safe disposal of radioactive wastes in Korea to satisfy the provisions specified in 'low and intermediate level radioactive waste transfer guidelines' of announcement No. 2005-18 from the Ministry of Science and Technology and specific site waste acceptance criteria (tentative plan). In addition, it is being planned to administer amendment on commercial atomic power plant related procedures and ensile staff training in order for early introduction and operation of radioactive waste certification system.

  • PDF

세계의 방사성폐기물관리

  • 한국원자력산업회의
    • Nuclear industry
    • /
    • v.4 no.2 s.18
    • /
    • pp.68-73
    • /
    • 1984

  • 원자력발전의 정착도가 증가함에 따라 방사성폐기물문제가 클로우즈업되고 있어, 국제원자력기구(IAEA)는 작년에 $\ulcorner$방사성폐기물에 관한 국제회의$\lrcorner$를 미국의 시애틀에서 개최하였다. 다음은 이 회의에서 발표된 논문을 중심으로 일본방사성폐기물 관리조사단이 작성한 보고서에서 주요국의 방사성폐기물관리현황을 요약한 것이다.

  • PDF