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Digital Microwave 통신을 위한 K-band 초소형 Triple-mode 공동 공진기 대역통과 필터에 관한 연구
곽민우,안기범,민혁기,이주현,류근관,홍의석 한국전자파학회 1999 한국전자파학회논문지 Vol.10 No.2
본 논문에서는 삼중모드 공동 공진기를 이용하여 K-b잉1d 2단 6-pole 대역통과 필터를 설계.제작하였다. 대 역통과 필터는 중심 주파수 18.5 GHz에서 대역폭 100 MHz로 설계하였으며 응답은 Chebyshev 함수를 이용하였 다. 공동 공진기의 공진모드는 $TE_{ll3}$과 $TM_{0l2}$ 모드를 이용하였다. 공동 공진기간의 결합은 Chebyshev 필터 응 답을 구현하기 위하여 슬롯 평면에 평행한 TE 모드의 자계 성분만을 결합하도록 하였다. 특히 본 논문에서는 원통형 공동 공진기내의 TE 모드에 대한 H-필드 기본식으로부터 결합계수 수식을 상세히 유도하여 이를 intercavity 슬롯의 위치와 크기를 결정하는데 이용하였다. 측정된 필터 응답은 설계 사양과 잘 일치하였다. A 2 stage 6-pole bandpass filter (BPF) is designed and implemented by using K-band triple-mode cavity. The BPF has an 100MHz bandwidth at the center frequency of 18.5GHz and the response of the filter is Chebyshev function. The cavity filter uses two orthogonal $TE_{113}$ modes and one $TM_{012}$ mode. To obtain a Chebyshev response, the intercavity coupling between the adjacent cavities is accomplished by H-field component of TE modes parallel to slot plate. In this paper, the size and location of intercavity slot are determined by the detailed coupling equation from H-field of TE resonant modes in circular cavity. The measured results agree well with the theoretical one.
결정론적 및 확률론적 방법을 이용한 방사성폐기물 운반 위험도평가 비교 . 분석
곽민우,김혁재,오가은,이신동,김광표 (사)한국방사선산업학회 2023 방사선산업학회지 Vol.17 No.1
When assessing the risk of radioactive wastes transportation on land, computer codes suchas RADTRAN and RISKIND are used as deterministic methods. Transportation risk assessment usingthe deterministic method requires a relatively short assessment time. On the other hand, transportationrisk assessment using the probabilistic method requires a relatively long assessment time, but producesmore reliable results. Therefore, a study is needed to evaluate the exposure dose using a deterministicmethod that can be evaluated relatively quickly, and to compare and analyze the exposure doseresult using a probabilistic method. The purpose of this study is to evaluate the exposure dose duringtransportation of radioactive wastes using deterministic and probabilistic methods, and to compare andanalyze them. For this purpose, the main exposure factors were selected and various exposure situationswere set. The distance between the radioactive waste and the receptor, the size of the package, and thespeed of vehicle were selected as the main exposure factors. The exposure situation was largely dividedinto when the radioactive wastes were stationary and when they were passing. And the dose (rate) modelof the deterministic overland transportation risk assessment computer code was analyzed. Finally,the deterministic method of the RADTRAN computer code and the RISKIND computer code and theprobabilistic method of the MCNP 6 computer code were used to evaluate the exposure dose in variousexposure situations during transportation of radioactive wastes. Then we compared and analyzed them. As a result of the evaluation, the tendency of the exposure dose (rate) was similar when the radioactivewastes were stationary and passing. For the same situation, the evaluation results of the RADTRANcomputer code were generally more conservative than the results of the RISKIND computer code andthe MCNP 6 computer code. The evaluation results of the RISKIND computer code and the MCNP 6computer code were relatively similar. The results of this study are expected to be used as basic data forestablishing the radioactive wastes transportation risk assessment system in Korea in the future.