To address the pressing societal concern in Korea, characterized by the imminent saturation of spent nuclear fuel storage, this study was undertaken to validate the fundamental reprocessing process capable of substantially mitigating the accumulation of spent nuclear fuel. Reprocessing is divided into dry processing (pyro-processing) and wet reprocessing (PUREX). Within this context, the primary focus of this research is to elucidate the foundational principles of PUREX (Plutonium Uranium Redox Extraction). Specifically, the central objective is to elucidate the interaction between uranium (U) and plutonium (Pu) utilizing an organic phase consisting of tributyl phosphate (TBP) and dodecane. The objective was to comprehensively understand the role of HNO3 in the PUREX (Plutonium Uranium Redox Extraction) process by subjecting organic phases mixed with TBPdodecane to various HNO3 concentrations (0.1 M, 1.0 M, 5.0 M). Subsequently, the introduction of Strontium (Sr-85) and Europium (Eu-152) stock solutions was carried out to simulate the presence of fission products typically contented in the spent nuclear fuel. When the operation proceeds, the complex structure takes the following form. 􀜷􀜱􀬶 􀬶􀬾(􀜽􀝍) + 2􀜰􀜱􀬷 􀬿(􀜽􀝍) + 2􀜶􀜤􀜲(􀝋􀝎􀝃) ↔ 􀜷􀜱􀬶(􀜰􀜱􀬷)􀬶 ∙ 2􀜶􀜤􀜲(􀝋􀝎􀝃) Subsequently, separate samples were gathered from both the organic and aqueous phases for the quantification of gamma-rays and alpha particles. Alpha particle measurements were conducted utilizing the Liquid Scintillation Counter (LSC) system, while gamma-ray measurements were carried out using the High-Purity Germanium Detector (HPGe). The distribution ratio for U, Eu (Eu-152), and Sr (Sr-84) was ascertained by quantifying their activity through LSC and HPGe. Through the experiments conducted within this program, we have gained a comprehensive understanding of the selective solvent extraction of actinides. Specifically, uranium has been effectively separated from the aqueous phase into the organic phase using a combination of tributyl phosphate (TBP) and dodecane. Subsequently, samples containing U(VI), Eu(III), and Sr(II) underwent thorough analysis utilizing LSC and HPGe detectors. Our radiation measurements have firmly established that the concentration of nitric acid enhances the selective separation of uranium within the process.

본 연구는 소셜미디어 이미지를 이용하여 대구광역시 내 반려견 산책 선호장소와 특징을 분석하 였다. 2020년부터 2022년까지 약 2년간의 시간적 범위를 기반으로 ‘#반려견산책’ ‘#강아지산책’, ‘#개산책’ 세 가지의 인스타그램 해시태그를 활용해 분석을 시행하였다. 그 결과 첫째, 추출된 622 건의 위치 데이터를 바탕으로 대구광역시 내 반려견 인기 산책 장소는 총 13개인 것으로 나타났으 며, 상위 세 개 장소의 경우 국채보상공원, 두류공원, 수성못인 것으로 나타났다. 둘째, 반려견 동반 산책 선호장소의 공간적 특징 및 경향성 파악을 위한 719개의 사진분석결과 ‘수변산책로’, ‘거주지 주변’, ‘공원’, ‘도시/도시인프라’, ‘반려견운동장/카페’ 총 다섯 가지 분류체계 항목으로 조사되었 다. 사진들의 다양한 요소 및 특성(Attributes) 분석틀에 의한 유형분류 결과 반려견만을 집중하여 확대, 촬영한 사진들을 제외하고 ‘경관’, ‘자연요소’, ‘활동/레저’, ‘사람’, ‘도시/장소’의 다섯 유형 으로 분류되었다. 본 연구를 통해 반려견 산책 선호장소와 유형들을 파악하여 반려견 산책환경 개 선방안을 도출하였다.