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Metal Grid Mesh 인쇄를 이용한 투명 전파 흡수구조 설계
윤선홍,이준상,이인곤,홍익표,Yoon, Sun-Hong,Lee, Jun-Sang,Lee, In-Gon,Hong, Ic-Pyo 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.3
In this paper, we designed the transparent circuit analog radar absorbing structure using printed metal grid mesh for enhanced optical transmittance. To obtain wideband electromagnetic absorption and enhanced optical transparency at X-band, we proposed the resistive FSS(Frequency Selective Surface) using printed metal mesh pattern on transparent glass with PEC(Perfect Electric Conductor) plane using ITO(Indium Thin Oxide) coating. We then fabricated the proposed structure to verify the simulation results obtained from commercial EM simulator. The comparisons between the simulation and measured results show good agreements. The results also show that the proposed radar absorbing structure can provide wideband reflection as well as better optical transparency. We can apply this proposed structure to the canopy of stealth aircraft and other stealth and security applications for visible transparency.
김준혁,윤선홍,배진형,차길용 (사)한국방사선산업학회 2023 방사선산업학회지 Vol.17 No.3
To effectively and safely manage the radiation exposure to nuclear power plant (NPP)workers in accidents, major overseas NPP operators such as the United States, Germany, and Francehave developed and applied realistic 3D model radiation dose assessment software for workers. Continuous research and development have recently been conducted, such as performing NPP accidentmanagement using 3D-VR based on As Low As Reasonably Achievable (ALARA) planning tool. In linewith this global trend, it is also required to secure technology to manage radiation exposure of workersin Korea efficiently. Therefore, in this paper, it is described the application method and assessmentresults of radiation exposure scenarios for workers in response to accidents assessment technology,which is one of the fundamental technologies for constructing a realistic platform to be utilized forradiation exposure prediction, diagnosis, management, and training simulations following accidents. First, the post-accident sampling after the Loss of Coolant Accident (LOCA) was selected as the accidentand response scenario, and the assessment area related to this work was established. Subsequently,the structures within the assessment area were modeled using MCNP, and the radiation source of theequipment was inputted. Based on this, the radiation dose distribution in the assessment area wasassessed. Afterward, considering the three principles of external radiation protection (time, distance,and shielding) detailed work scenarios were developed by varying the number of workers, the presenceor absence of a shield, and the location of the shield. The radiation exposure doses received by workerswere compared and analyzed for each scenario, and based on the results, the optimal accident responsescenario was derived. The results of this study plan to be utilized as a fundamental technology to ensurethe safety of workers through simulations targeting various reactor types and accident responsescenarios in the future. Furthermore, it is expected to secure the possibility of developing a data-basedALARA decision support system for predicting radiation exposure dose at NPP sites.
건물 내 주파수 선택적 공간 구현을 위한 인쇄전자 기술 기반 필름형 주파수 선택 표면구조 설계
이인곤,윤선홍,홍익표 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.12
본 논문에서는 건물 내에서 통신성능 저하의 원인이 되는 인접 채널의 신호를 제어하기 위해 대역 저지 특성을 갖는주파수 선택 표면구조를 설계하였다. 제안된 구조는 입사파의 편파 및 입사각에 안정적인 주파수 특성 구현을 위해 프랙탈 형상 기반의 소형화된 단위구조를 사용하였으며, 실제 적용성을 고려, 적은 제작비용으로 대량생산이 용이한 인쇄전자 기술을 이용하여 얇은 필름형 주파수 선택 표면구조를 제작하였다. 전통적인 회로제작 방식인 PCB 공정이 아닌 전도성 Ag 잉크를 이용한 스크린 프린팅 공정을 통해 생산성 및 환경성을 개선하였으며, 설계한 결과를 바탕으로 자유공간측정을 통해 입사파의 편파 및 입사각에 대한 안정적인 특성을 검증하고, 실제 건물 내벽에 적용 후, 수신 신호강도 측정을 통해 주파수 선택 성능을 확인하였다.
곽채송,윤선홍 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this work, we developed a flexible piezoelectric device was produced low-temperature-cured Ag (LTC-Ag) paste using screen-printing technology. The flexible piezoelectric electrodes based LTC-Ag paste was prepared by a facile method and low-cost technology. Also, LTC-Ag paste can be cured at a low-temperature of 80°C, so it can be printed without deformation of the substrate. Optical microscopy and FE-SEM images confirmed that the flexible LTC-Ag@PET electrodes have excellent printability and the Ag micro-nanoparticle was well coated onto PET. The LTC-Ag@PET electrodes showed a lower sheet resistivity of ~ 0.0431Ω·sq<sup>-1</sup>, ~ 3.0x10-5Ω·cm resistivity, and showed excellent adhesive 0 class at cross-cut test.
원전 중대사고 해석코드 MAAP5의 코어캐처 열전달 모델 변경을 위한 API 개발
이대형,김병조,윤선홍 대한기계학회 2024 대한기계학회 논문집 C. 기술과 교육 Vol.12 No.2
원자력 발전소에서 발생할 수 있는 냉각재 상실이나 전기 고장은 노심의 충분한 냉각을 방해하여 과열로 인한 노심 손상을 초래할 수 있다. 이러한 위험에 대비하여, 유럽 수출형 원전인 APR1000은 코어캐처를 도입하였다. 코어캐처는 노외로 방출된 노심용융물을 냉각함으로써 중대사고를 완화하는 핵심적인 설비이다. 본 연구에서는 코어캐처 성능 평가를 위해 필요한 다양한 열속 분포를 고려하여, 중대사고 해석코드 MAAP5의 열속 분포를 조정할 수 있는 API를 개발하였다. Coolant loss or electrical failure in nuclear power plants can impair the adequate cooling of the reactor core, potentially leading to core damage. To mitigate this risk, the APR1000, a European export-type nuclear power plant, incorporates a core catcher. This device is essential for managing severe accidents by cooling the molten core that may be released from the reactor vessel. This study has developed an API for the severe accident analysis code MAAP5 to refine the heat flux distribution modeling. This enhancement aims to improve the evaluation of core catcher performance under various heat flux conditions, thereby contributing to more accurate severe accident simulations.